cable body and method for making an elongated cable body

专利摘要:
invention patent summary: "method for producing a toothbrush and toothbrush". the present invention relates to a handle body (1a, 1g), in particular, a body care article, such as a toothbrush, comprising a handle part (4a, 4g), a neck part (3a, 3g) and head part (2a, 2g), wherein the cable body (1a, 1g) comprises a first and a second material component (7, 8) of a thermoplastic plastic. the first and second material components (7, 8) have a common injection point (10) which is disposed outside a mold separation line (12) formed by the mold separation.
公开号:BR112014002346B1
申请号:R112014002346
申请日:2012-07-25
公开日:2020-04-14
发明作者:Zwimpfer Martin；Schär Michael；Zurfluh Peter；Kirchhofer Roger
申请人:Trisa Holding Ag；
IPC主号:

专利说明:

Descriptive Report of the Invention Patent for CABLE BODY AND METHOD FOR THE MANUFACTURE OF AN ELONGED CABLE BODY.
[0001] The present invention relates to the field of cable bodies, in particular, for articles for body care or cosmetic articles, such as toothbrushes, tongue cleaners, wet shavers, oral hygiene articles , mask applicators, nail polish applicators, lipstick applicators, etc. The invention relates in particular to a handle body for a toothbrush, with a handle part, with a neck part and a head part, wherein the handle body comprises at least one first and a second component of thermoplastic plastic material. Furthermore, the invention relates to a method for making such a cable body as well as to an injection molding tool for carrying out the method.
State of the Art [0002] It is known to manufacture cable bodies for cosmetic products and for body care, in particular for plastic toothbrushes using an injection molding method, in which the body of cable is injection molded from several different thermoplastic plastics. For this, a first plastic component is injected into a first tool cavity of an injection molding tool, in which the tool cavity is completely filled. The tool cavity here does not represent a negative mold of the finished cable body, however, the negative mold of the body part of the first material component. The body part of the first material component is subsequently reapplied in an additional tool cavity, which is larger than the body part. The empty space between the body part and the cavity wall is then
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2/74 peripherally injected with a second material component, where it connects to the first material component, for example, with a material fit or positive fit. A cable body of two different components of thermoplastic material is molded in this way. Additional material components can be attached by repeating the previously mentioned steps. This method, however, has some disadvantages. As a result, tool costs are quite high due to the use of several tool cavities for the manufacture of an injection molded part. In addition, manufacturing speed and thus productivity are comparatively low due to the reapplication step.
[0003] In addition, it should be noted that an additional injection point (entry point) appears in each material component that is injected. However, the injection points compromise the appearance of a cable body, so that the number of such injection points or surface injection points is kept as low as possible.
[0004] In addition, the possibilities of shape or design of the cable body made from different material components remain limited despite the mentioned technical possibilities. A self-styled interflow of different plastic components is not possible, or can be implemented only through the application of complicated and expensive injection molding molds.
Description of the Invention [0005] Therefore, an object of the invention is to provide a cable body of the type initially mentioned, which comprises two or more components of plastic material which, in relation to their functional purpose, are arranged in the cable body
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3/74 in a targeted manner. The cable body must be easily manufactured with a few method steps, as well as inexpensively despite the application of different functional material components to the cable body. The manufacture of the injection molding mold must be inexpensive and produced with a minimum sequence of cavities. Therefore, advantageously, several material components must be injected into a cavity. In addition, the cable body must allow for a high degree of automation in manufacturing and can be manufactured in large numbers of parts.
[0006] The invention is realized by the independent claims
1, 10 and 17. The dependent claims contain particular embodiments and further developments of the invention. In this way, the capabilities of method claims, device claims and product claims can be combined with one another where it makes sense.
[0007] The invention is then characterized by the fact that the first and second material components have a common injection point (entry point) that is disposed outside a mold separation line formed by the mold separation. The cable body comprises a head part, in which a functional part, for example, a brush body, a cosmetic applicator or a blade arrangement is arranged, a cable part, in which the cable body is held by the user and a neck part that connects the cable part and the head part to each other.
[0008] In an additionally preferred development of the cable body, at least the cable part comprises a jacket body of the first material component and a core body of the second material component which is at least partially surrounded by the shirt body. The shirt body is
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4/74 preferably characterized by the fact that it forms at least partially the surface of the cable part or the cable body. [0009] The second material component can be arranged only in the cable part, only in the cable part and in the neck part or in the cable part, as well as in the neck part and the head part. The second material component can also be formed in the neck part or in the neck part and in the head part as a core body which is at least partially or completely surrounded by a shirt body of the first material component.
[00010] In a preferred embodiment of the invention, the cable body, preferably, with the exception of the injection point, comprises a core body of the second material component which is completely surrounded by the jacket body of the first material component and which it is formed only on the cable part, on the cable part and on the neck part or on the cable part, neck part and head part.
[00011] Furthermore, one can also predict the core body in the cable part, the neck part and / or the head part, in regions that cross the shirt body to the surface of the cable body and that form a surface section of the cable body. [00012] The shirt body of the first material component surrounding the second material component can be, for example, 0.5 - 5 mm thick, and in particular 1.5 - 3 mm thick.
[00013] According to a particularly preferred embodiment of the invention, the second material component formed on the cable part as a core body, towards the head part, leaves the wrapping body of the first material component and appears on the cable body surface. According to this modality, the head part can consist completely of the
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5/74 second material component. This modality is based on the discovery that the material component in the head part serves to perform a different technical function from the material component in the cable part. For this reason, different material components must be used on the cable part and the head part. Thus, for example, it may be important that the material component that forms the surface of the cable part, is characterized by good haptics, whereas the material component that forms the head part must ensure sufficient rigidity.
[00014] Furthermore, it is possible on the cable part to use a material that is not suitable for certain functions on the head part and that, for example, is not suitable for the AFT method described later (welding of carrier plates apart from requires certain combinations of material). Injection-molded interdental brushes can also be formed in this way. The cable as a first material component provides stability, while the second material component depends on the region of the bristle field or the bristles, and this corresponds to different functionalities. Last but not least, it is also possible that less expensive or also recycled materials are applied to parts that are less functionally demanding than to functionally demanding parts.
[00015] The common injection point of the first and second material components is arranged on the anterior side or on the posterior side of the cable body, preferably on the posterior side of the cable body. The injection point is preferably arranged additionally on an intermediate longitudinal geometric axis of the cable body. The anterior side is that side of the cable body, on which the functionally effective part of the functional part is located. On a toothbrush, these are the bristles. In addition, a rest
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6/74 of thumb to support the retention cable is preferably also located on the front side in the front end section of the cable part. The posterior side, therefore, is the side that is opposite to the anterior side.
[00016] Without any particular measures, the second material component reaches the surface of the cable body at the injection point. Because of this, one can predict the first component of material that is injected again in such quantity subsequent to the injection of the second component of material, that the injection point is also formed from the first point of material, so that the body of shirt also consists of the first material at the injection point. The second material component is completely confined by the material of the first material component in this way.
[00017] The surface sharing that the second material component assumes at the injection point depends above all on the cooling time of the first material component. A longer cooling time gives less of a surface share than a short cooling time.
[00018] The mold separation line of the tool cavity is preferably located laterally between the anterior and posterior sides. Furthermore, the injection point of the first and the second material component is preferably arranged in the cable part. The injection point is preferably 1 to 20 mm apart and, in particular, 3 to 8 mm from the lateral end of the cable. In the event that additional material components are applied, their injection point can be arranged on the support point at any location in the longitudinal direction and, preferably, on the intermediate longitudinal geometric axis in the transverse direction.
[00019] In an additionally particular development of the body
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7/74 of cable, it comprises at least one through opening. The through opening is preferably arranged in the cable part, in the neck part or in the transition between the cable part and the neck part. In the region of the through opening, the cable body is temporarily divided into two or more parts of arms in the longitudinal direction, and these parts of arms unify again in one body and, thus, confine the through opening. The arm parts may, in each case, comprise a shirt body of the first material component and a core body similar to the resp line. similar to the leg of the second material component that is surrounded by the shirt body, or consists of this. In addition, it is also possible that the cross-sectional arm parts consist only of the first or second material component.
[00020] Core bodies similar to two lines, then, with the joining of the arms parts towards the head part can
The. reunify, and pass additionally as a core body similar to the common thread surrounded by the shirt body, or
B. pass additionally parallel to each other towards the head part as separate line parts surrounded by the shirt body and preferably come out in a manner similar to the tongue on the neck part or head part. [00021] The cable body preferably comprises at least a third component of a thermoplastic plastic material which is preferably soft elastic and, for example, consists of a thermoplastic elastomer. The third material component, for example, is integrally formed in the cable body in a separate injection molding step and between forming its own injection point in an additional injection molding cavity.
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8/74 [00022] The third material component, for example, serves to form a thumb rest. In addition, this third material component can also be provided for decorative purposes or due to ergonomic aspects as a retaining element in the cable body. In addition, the third material component can also serve to cover a longitudinal section of the cable region in the region of an outlet of the second material component from the first material component. The subsequent examples of modality are referred to in relation to a detailed description.
[00023] The third material component is integrally formed over the cable body, for example, in the region of a through opening described above. The third material component can partially or completely cover the arm parts and / or close the through opening. In addition, the third material component can also be arranged in other regions in the cable body. The application of the third material component in a through opening can also be aimed at increasing the local flexibility of the cable body.
[00024] Additional material components can be integrally formed, apart from the third material component. These can be designed, in each case, as rigid or soft components, and be arranged on the head part, neck part and / or cable part. The additional material components can also be processed according to the invention in the same way as the first and second material components. The third and, as may be the case, the additional material components can contact only the first, only the second, or the first and second material components.
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9/74 [00025] In addition, however, it is also possible not to process the first and second material components mentioned, first, in the injection molding method. In this way, firstly, a base body, preferably of one or more rigid components and, as may be the case, part of the soft components can be manufactured. Subsequently, the first and second material components can be applied to the base body. As may be the case, the mentioned third component or additional material components can still be subsequently attached to it. The additional special geometric arrangements of the material components according to the invention are thus possible in the cable body. In this way, the base body provides a base for an additional material body, for example, in order to apply the material combination according to the invention at special locations in the cable body. In this way, for example, a cable part can be injection molded as a base body, in which subsequently the method, according to the invention, is applied only in the region of the neck part and / or head part.
[00026] The cable body of the first and second material components is preferably reapplied in an additional tool cavity, to integrally form the third or additional material components. The third or additional material component is then injected into this tool cavity. As mentioned, the through opening mentioned in the cable body can serve to create a thumb rest. The through opening is injected partially or completely peripherally with a material component for this purpose.
[00027] The first and second material components may differ in the nature and / or color of the material. Preferably, the two
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10/74 material components consist of different plastics and / or different colors or transparencies. As a special design, in this way, the first and second material components of the same material with different colors can be applied.
[00028] The following material combinations are possible: first material component second material component
combination 1: rigid component component hard combination 2: rigid component component soft combination 3: soft component component hard combination 4: soft component component
soft [00029] The rigid component is characterized by a rigid cable and comparatively high flexural stiffness. This is applied, in particular, to the head and neck part and also as a core body in the cable part and provides the body with stability. It is clear from this that the second material component is a particularly preferable rigid component.
[00030] Two identical materials with different colors or two different materials with the same or different colors can be explicitly used with a combination of 1 and 4.
[00031] Different thermoplastic plastic can be used as rigid components. Thus, in particular, the following thermoplastic plastic is suitable as a rigid component:
polymerized styrene, such as styrene acrylonitrile (SAN), polystyrene (PS), acrylonitrile butadiene styrene (ABS), methyl methacrylate styrene (SMMA) or butadiene styrene (SB);
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11/74 polyolefins, such as polypropylene (PP) or polyethylene (PE), for example, also, in the form of high density polyethylene (HDPE) or low density polyethylene (LDPE);
polyesters, such as polyethylene terephthalate (PET) in the form of acid modified polyethylene terephthalate (PETA) or glycol modified polyethylene terephthalate (PETG), polybutylene terephthalate (PTB), polyethylene dimethylene terephthalate modified with acid (PCT-A) or glycol-modified polycyclohexylene dimethylene terephthalate (PCT-G);
cellulose derivatives, such as cellulose acetate (CA), cellulose acetobutyrate (CAB), cellulose propionate (CP), cellulose acetate phthalate (CAP) or cellulose butyrate (CB);
polyamides (PA), such as PA 6.6, PA 6.10 or PA 6.12; polymethyl methacrylate (PMMA);
polycarbonate (PC); polyoxymethylene (POM);
polyvinyl chloride (PVC);
polyurethane (PUR) [00032] Meanwhile, polypropylene (PP) or a particularly preferred acid-modified polycyclohexylene dimethylene terephthalate (PCT-A) is applied as a rigid component. PCT-A due to its excellent transparent characteristics is particularly suitable as the first material component that, as is known, forms the shirt body. The rigid PP component preferably has an E module of 100 - 2400 N / mm ² , preferably 1300 to 1800 N / mm ² .
[00033] The soft component is characterized by its characteristics of soft elastic that applied to the surface of the cable body ensures a pleasant grip (haptic). It is particularly clear from this that the first component of
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12/74 material or, also, the third component of additional material is a soft component.
[00034] Different thermoplastic elastomers (TPEs) can be applied as soft components. Thus, in particular, the following thermoplastic elastomers are applied as soft components:
thermoplastic polyurethane elastomers (TPE-U) thermoplastic styrene elastomers (TPE-S), such as ethylene butylene styrene styrene copolymer (SEBS) or styrene butadiene styrene copolymer (SBS) thermoplastic polyamide elastomers (TPE-A) thermoplastic polyolefin (TPE-O) thermoplastic polyester elastomers (TPE-E) [00035] TPE-S is preferably applied as a soft component. In addition, thermoplastic polyethylene (PE) and polyurethane (PU) can be used as rigid components, as well as soft components. Shore A hardnesses of the soft component are preferably below 90 Shore A.
[00036] The first and second material components, and in particular the soft components and the rigid component, preferably form a material fit in the injection molding method. However, it is also conceivable that a material fit does not result in a positive fit, however, depending on the choice of material components and method parameters. The regions with a material fit and positive fit can alternate.
[00037] In addition, the applied material components can also have a different shrinkage behavior (degree of shrinkage) or material adjustment behavior, so that a special optical effect starts on the contact surface of the first and second material components .
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13/74 [00038] The internal material component, in this case, has a higher degree of shrinkage than the external material component. As a result, the internal material component shrinks more than the external material component, through which a gap originates. Such an effect can arise, for example, if the first material component is a PCTA, and the PP is used as a second material component. The effect arises due to different shrinking behaviors and an empty space (vacuum) or separation surface between the two components that originate thereby.
[00039] The geometric design of the body itself can support this optical effect or produce it with an enhanced effect. Thus, for example, triangular shapes support these optical effects.
[00040] In addition, it is also possible that the effect mentioned above is triggered not until a flexion of the body. That is, the layers separated by flexing, which means that the empty space or a separating surface is created.
[00041] The cable body is preferably used as a cable body for a manual or electric toothbrush (cable compartment). This can be disposable or multipurpose toothbrushes in the field of manual toothbrushes. Electric toothbrushes can perform oscillating, articulated, translational or combined movements. In addition, electric toothbrushes can be designed, for example, as sonic toothbrushes or vibrating toothbrushes. In addition, the cable body according to the invention can also be applied to tongue cleaners, interstitial dental care devices, such as interdental brushes, flossers, toothpicks or interdental cleaning devices that combine the brushes , flossers and toothpicks
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14/74 tooth interdentally mentioned, with wet shavers or generally as body care applicators. Such body care applicators can be, for example, nail polish brushes or mask applicators. In addition, the cable body, according to the invention, can be used in household articles. These can be, for example, brooms, floor cloths or dishwashing brushes.
[00042] One aspect of the invention is the application of this in the field of the electric toothbrush compartment or generally toothbrushes with hollow bodies like the handle bodies. These bodies are preferably at least partially designed in a similar way to hollow cylinders and have relative thin wall thicknesses. The second material component is also injected after the first material component is injected. This second material component due to the relative thin wall design appears at least partially on the surface and also on the surface in the region of the injection point. For example, this application can serve as the formation of functional elements or in the hollow body. For example, a rigid component can be used as a first material component and a soft component as a second material component. The soft components can be applied to the location region that is used to operate the on / off switch or other switches.
[00043] The toothbrush manufactured outside the handle body, according to the invention comprises, a field of bristles of a plurality of individual bristles and which is applied to the head part. The head part consists of a rigid component, and can also additionally comprise a soft component. The soft component can serve as the formation of a tongue cleaner on the posterior side of the head part, or also as the
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15/74 formation of massage elements and soft elastic cleaning elements in the bristle field. The bristle field can be fixed over the head using known technology. The bristles of a bristle field can consist of a different material or the same material.
[00044] The bristles can be, for example, injected and, for example, consist of one of the following plastics:
polyamide elastomer (eg Grilflex ELG 5930 from Ems-Chemie AG) polyester elastomer (eg Riteflex 672 RF Nat or Riteflex RKX 193 RF Nat from Ticona Polymers or Hytrel 7248 from DuPont).
[00045] Plastics for injected bristles have, for example, a Shore D hardness of 0 to 100, preferably 30 to 80.
[00046] Bristles manufactured in a conventional manner, which may, for example, be pointed or cylindrical, are preferably made of polyamide (PA) or polyester (PBT).
[00047] Fixing the bristles to the head can be done in different ways. For example, the anchor-free tuft insertion method (AFT) can be applied. With the AFT method (anchor-free tuft insertion) the conventional cylindrical or pointed bristles or bundle of bristles are fixed to the head part or to a carrier plate without the aid of an anchor. The rounded bristles, in this way, are profiled in a grouped manner and with their end that is opposite the free end used are pushed through the openings in the carrier plate, so that an end region of the bundle of bristles protrudes beyond the bottom the carrier plate. The bristles are fixed by means of fusion, consolidation or welding, in this end region of the bristles that protrude beyond the
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16/74 bottom side of the carrier plate. The carrier plate with the conventional bristles attached to it is then anchored in the recess of the toothbrush head region, for example, by means of ultrasonic welding. The recess in the head region, therefore, is especially adapted to the geometry of the carrier plate. The carrier plate or, also, the toothbrush head region, in addition to conventional bristles, can comprise elements of massage and cleaning of soft elastic. [00048] Alternatively, a rigid or soft component is injected along the carrier plate in an injection molding tool in order to form the cable body around the carrier plate.
[00049] In addition, the bristles can be attached to the cable body using the conventional anchoring method. For this, the bundle of bristles is bent by means of a metal anchor plate and subsequently fixed in the bristle receiving holes. The bundle of bristles comprises two halves due to the fold by means of the anchor, and these halves, in each case, cover one end of the folded bristles. Post-machining, such as profiling and cutting, is subsequent to fixing the bristles, depending on the type of bristle. The toothbrush head region with the bristle receiving holes, in this way, can be additionally provided with massage elements and soft elastic cleaning elements.
[00050] Certainly, other methods of inserting bristles, such as IAP (production without integrated anchor) or IMT (when inserting tufts of mold) can also be used for inserting the bristles. As described, the bristles can be formed directly from the plastic material in the injection molding tool by means of injection molding.
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17/74 [00051] Self-styled bioplastics are also usable as a bristle material or as one of the material components. These are plastics that are made from renewable raw materials. [00052] The invention furthermore relates to a method for making an elongated handle body of a body care article, in particular a toothbrush, from at least two material components. The method also refers to the injection molding of at least two material components in an injection molding tool using a hot runner method. In known injection molding methods, according to the hot runner method, a body part of a first material component is injected into a first tool cavity of an injection molding tool. The body part is subsequently re-applied to an additional, larger tool cavity, into which a second material component is injected, which fills the remaining mold cavity in the tool cavity and connects to the first material component with a positive fit. . This method, however, is very complicated and, consequently, expensive.
[00053] The method, according to the invention, is thus characterized by the fact that at least two plastic components are injected through a common injection point into a common tool cavity of the injection molding tool by means of of the method steps subsequently mentioned. The method steps comprise:
injection molding a first material component into the tool cavity and partial filling of the tool cavity with the first material component through a hot runner nozzle;
cool the first component of material injected into the
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18/74 tool cavity, in which at least one flowable web is preserved in the first material component;
injection mold a second material component into the tool cavity of the injection molding tool through the same hot runner nozzle and, additionally, preferably completely fill the tool cavity with the second material component.
[00054] In relation to the tool cavity, it is preferably designed as a longitudinal cavity with a longitudinal geometric axis, in a way that corresponds to the nature of the cable part to be manufactured. If the tool cavity is completely filled with the second material component, then, in the injection of the second material component, the injection pressure is maintained for the completion of the injection molding step and a self-named holding pressure applied, so that the tool cavity is completely filled. This holding pressure, however, is carried out far from the injection of the first material component, since the tool cavity is not completely filled with the first material component and, therefore, also no back pressure appears.
[00055] The first and second material components are temporally injected one after the other in the same tool cavity. A cooling phase, in which the first material component cools and partially solidifies in the tool cavity, takes place between the injection of the first and second material components. The tool cavity or its walls can be actively cooled in the cooling phase. The cooling phase can be, for example, from 2 to 35 seconds. Among other things, this depends on the design of the cable body.
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19/74 [00056] The wall thickness of the first material component can be significantly influenced by the intensity and duration of the cooling. It is now not possible to cool the tool cavity in a uniform or symmetrical way, however, to cool different regions of the tool cavity very differently or for a long period of time differently, so that the wall thickness differs from the first material component originates along the component. This means that the component cools to a different extent or solidifies to a different extent. This, in turn, influences the design of the flowable web and thus the flow behavior and distribution of the second material component subsequently injected into the tool cavity. For this reason, one can obtain special structures in the distribution of material in the cable body by means of a targeted or asymmetric cooling of the tool cavity or cavity wall. These particular structures can serve a functional purpose and / or contribute to a particular optical appearance.
[00057] In this way, the first material component in the tool cavity has already cooled a little at the time point of injection of the second material component. The outer regions of the mold mass solidify first while the core cools last and remains flowable for longer, as the cooling of the mold mass exits the wall of the tool cavity. For this, the cavity wall can be actively cooled, in order to be able to better control the solidification process. However, cooling can also be performed passively, by removing heat through the injection molding tool.
[00058] This means that at a certain stage in the process, the
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20/74 the first injected mold mass has an outer jacket body towards the cavity wall, and this body is no longer flowable due to the advance of the solidification process. Not flowable in this context means that this mold mass cannot be displaced by the second material component in the subsequent additional injection molding step. The mold mass, however, still comprises a hotter core body that is surrounded by the jacket body and in which the mold mass is still flowable. This core body is also called a hot core or plastic core. The volume of the non-flowable liner body as well as the flowable core body at the time point of injection of the second material component can be controlled through the cooling intensity and the time interval between the first and the second molding step by injection, through a control device. Different distribution patterns of the two material components within the cable body can be obtained depending on the total volume of the first injected material component, as well as the volume of the flowable core body or the jacket body. Such different material distributions are explained in more detail by means of the exemplary modalities further specified below.
[00059] The hot core of the first material component previously injected into the tool cavity is replaced by the second material component during injection molding of the second material component and is displaced in the direction of material flow in a still empty region of the cavity tool. The first component of material that touches the cavity wall and that is at least partially solidified, on the other hand, is not displaced and at least partially surrounds the second component of material that flows inwards.
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21/74 [00060] The injection point is located outside the mold separation line of the tool cavity. The tool cavity is preferably designed in an elongated manner and has a longitudinal geometric axis, which corresponds to the maturity of an elongated handle body. The injection point is preferably applied so that the material components are injected into the cavity transversely with respect to the longitudinal geometric axis of the tool cavity. This means that the needle closing direction is preferably at an angle of 85 ° to 90 ° (degrees of angle) in relation to the longitudinal geometric axis of the tool cavity. This effects a deflection of the material flow in the direction of the longitudinal geometric axis which also corresponds to the direction of material flow in the tool cavity when the material flow meets the opposite cavity wall or the jacket body. As a result, the injected material is diverted, in particular, into the cavity wall which is located opposite the injection point. This type of injection of plastic components is known to you and is not new. Among other things, it ensures that both end sections of the elongated tool cavity are completely filled with the material.
[00061] In the present invention, this type of injection of plastic components, however, still has an additional advantage. According to a first step in the method, specifically a space of part of the tool cavity is filled first with the first material component. In particular, no material should penetrate the gap section of the tool cavity that has not yet been filled. Can someone prevent the first injected material that is distributed over the entire length of the tool cavity due to the fact that the injection direction is located transversely to the direction
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22/74 longitudinal of the tool cavity.
[00062] The injection point can now be arranged in an end section of the cable body, so that the second material component only moves in one direction of material flow and the hot core is displaced in only one direction. material flow. However, one can also predict the injection point being arranged between the cable body end sections, for example, in an intermediate region, and the second material component that propagates in two opposite material flow directions and the core of the first material component that is being moved in two opposite directions. In this way, for example, one can design a cable body that at two ends has a functional part of the second material component.
[00063] In a further preferred development of the invention, the second component of subsequently injected material leaves the first material component that surrounds it, in the direction of material flow. The end section of the tool cavity which forms the head part and which is located in the front in the direction of material flow, is thus at least partially filled with the second material component, preferably completely. This, for example, is the case if the total volume of the tool cavity minus the total volume of the first component of injected material is greater than the flowable web displaced by the second material component.
[00064] According to another further development of the invention, the second material component displaces the flowable web of the first material component in the material flow direction, wherein the web displaced in the material flow direction fills the front end section the tool cavity so
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23/74 that the second material component is completely surrounded by the first material component except at the injection point. This, for example, is the case if the total volume of the tool cavity minus the total volume of the first component of injected material is less than the flowable web displaced by the second material component.
[00065] According to a further particular development of the invention, the tool cavity in the direction of material flow or longitudinal direction is temporarily divided into at least two parts of channels leading along the longitudinal geometric axis around a core of insertion and subsequently reunites. The channel parts close at least one through opening in the cable body to be manufactured.
[00066] When injecting the second material component, the flowable web of the first material component is now displaced in the direction of material flow in an anterior end section of the tool cavity. The second material component follows the tool cavity and the displaced core while forming two parts of lines through the channel parts. The two parts of lines subsequent to the unification of the two parts of channels in the neck part pass separately and parallel to each other between the formation of two tongue-like extensions. In this case, the displaced soul completely fills at least the head part.
[00067] The two parts of lines have a distance of 0.3 mm to 3 mm, preferably 0.5 mm to 1.5 mm. If the parts of lines run out asymmetrically, which means that they are not equally long, then their ends have a distance in the longitudinal direction of the geometric axis of a maximum of 10 mm, preferably a maximum of 5 mm in relation to each other. others.
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24/74 [00068] According to a particular additional design of the invention, the tool cavity in certain regions can be narrowed, so that an effect similar to a through opening is obtained.
[00069] After injecting the first material component, due to the diameter ratio in the region of the narrowing at this location, from both sides it will cool, so that the two initially opposite layers unify in the first cooling phase.
[00070] The second material component will now flow around this cooled injection zone. The second material component thus follows the tool cavity and the web displaced between the formation of two line parts through the channel parts. The two parts of lines, subsequent to the unification of the two parts of channels in the neck part, now pass separately and parallel to each other between the formation of two tongue-like extensions.
[00071] The diameter or distance of the surfaces in the wall region, in which the layers are unified, is between 0.3 and 5 mm, preferably between 0.5 mm and 1.5 mm. In this way, the wall thickness is directly related to the method. Larger masses require more cooling time, and smaller masses require less cooling time. Such narrowing directly influences the cycle time, depending on how the remaining body is designed. The parts of lines in relation to their dimensions are designed as previously described.
[00072] One can foresee the first material component that is applied again in such quantity subsequent to the injection of the second material component, that the injection point is also formed from the first material component, so that the shirt body also consists on the first material at the injection point.
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25/74 [00073] In an additional application, it is possible to design the surface of the first material component in a non-continuous, that is, structured. This means, for example, that gradual stages or stages etc. can be integrated into the surface. This leads to the flow of the second component which behaves in a continuous manner and which forms the opposite external contour within the first material component.
[00074] According to an additional application, the tool cavity does not have a constant size. The size of the tool cavity will change between the first and second injection molding steps. This can be used to form special geometries in the cable part or also to obtain special optical effects. For this purpose, a core, for example, can be pulled after the introduction of the first material component, for example, in order to increase the tool cavity, so that the second material component has additional propagation possibilities.
[00075] The invention, moreover, also relates to an injection molding tool for carrying out the method described above. The plastic melt, as known, is transported from a plasticization set through a hot channel system to the tool cavity in injection molding thermoplastics.
[00076] Now, someone differentiates between self-styled hot runner technologies and cold runner technology in injection molding technology. Hot runner technology or a hot runner system for thermoplastic injection molding is indicated as a system that is thermally insulated and has a higher temperature compared to the remaining injection molding tool. A hot runner system is thermally
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26/74 separated from the rest of the tool and is separately heated, so that the plastic melt in it remains permanently flowable. No solidification of the plastic in the hot runner system thereby occurs, and no injection channel remains in the component. In addition, also, longer flow paths can be realized by means of the hot runner systems, since the pressure loss in the hot runner system is not increased by a cooling of the melt and the increase in viscosity conferred by this .
[00077] The hot runner ends at the hot runner nozzle that represents the transition from the material feed to the tool cavity in the injection molding tool. The hot runner nozzles, as well as the hot runner system are adjusted to the temperature window, in which the plastic can be plastically processed. A hot channel regulation that permanently compares the desired and actual temperatures and controls them with a closed circuit is applied to closed circuit temperature control. A hot runner system, moreover, is a closed system, with which the injection point is closed by a particular technique. This is done by one or more closing needles that are part of a needle closing system. The closing needles, for example, are actuated by a mechanism that can be separately activated, for example, electrically, pneumatically or hydraulically.
[00078] Regarding the needle closing system, the inlet diameter after the injection of the plastic mass is closed by the closing needle, which can be, for example, steel. The displaced material is pressed onto the plastic part. The needle is leveled or aligned with the surface of the plastic part. Someone can therefore only see a round mark on the product
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27/74 injected. The hot runner system described above is then applied to the injection molding tool according to the invention. [00079] In contrast, with the cold channel system, the cold channel system is not thermally isolated from the rest of the tool. The tool, as well as the cold runner system located on it, is temperature controlled at temperatures significantly below the processing temperature of the plastic. Thermoplastic plastic also solidifies in the cold channel system during the production of a component due to this. This solidified plastic is called an injection channel or injection channel system. Some disadvantages for this type of plastic injection in an injection molding tool are due to this.
[00080] In this way, the injection channel must be separated from the component in a second work step. This can be done either by means of additional functional elements on the tool or after removing the mold manually or by machine. As a rule, a mark remains on the component after separating the injection channel. Sharp edges can often remain without additional post-machining steps.
[00081] As a consequence, a part of the raw material does not flow into the finished product and must be reused or disposed of. In this way, the injection volume increases through the injection channel, and more plastic must be plasticized than is finally present in the product. This is disadvantageous in relation to energy, as well as the machine output. In addition, material costs due to the added material applied have a negative effect on the economy, in particular, with expensive thermoplastics of the art. The required post-machining of the product in the region of the injection point has a negative effect on process efficiency and economy.
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28/74 [00082] EP-A-1 346 808 then describes a hot runner system for making injection molded parts, such as salad sieves, from two different thermoplastic plastics. The closing needle system operates with a single closing needle guided in a channel, by means of which the material feed channels arranged in an axially displaced manner and which pass laterally within the channel can be closed. When injecting the first material, the confluence of the channel for the second material, which is located further away from the injection point, is actually sealed by the closing needle, so that only the first material is injected into the tool cavity through the channel. When injecting the second material component, however, the channel confluence for the first material, however, must be kept open. A back pressure, however, is applied to the channel, in order to prevent the first material from entering this channel. The solution is complicated and technically unsatisfactory, as it does not allow strict material separation with the injection procedure.
[00083] Therefore, it is known to supply several closing needles that individually close the individual material feed channels. These closing needles in relation to the project are aimed at a certain operating temperature and no longer satisfactorily seal a certain significant deviation from the operating temperature. This is based on the fact that the effects of longitudinal expansion no longer allow complete closure or sealing. The sealing, in this case, is made by the closing needle on a conical surface at the end of the needle. The effects of lengthening or lengthening are transmitted 1: 1 on the sealing capacity due to this.
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29/74 [00084] The injection molding tool according to the invention is also designed as a tool with a hot runner system of the type mentioned above, which comprises a hot runner nozzle that passes through a tool cavity and that is designed as a needle closing nozzle. The hot channel nozzle comprises a first closing needle designed as a hollow needle, as well as a second cylinder-shaped closing needle that can be inserted into the hollow needle nozzle. The first closing needle in the hot channel nozzle, with the channel or channel wall that faces outwards forms an external material feed channel and with its axial through opening forms an internal material feed channel.
[00085] The invention is now characterized by the fact that the hot runner nozzle comprises a cylinder-shaped outlet opening, and the first closing nozzle is a cylinder-shaped end section that is designed so that it can be inserted into the outlet opening with a positive adjustment to thereby seal the external material feed channel in the tool cavity, between the formation of a cylindrical sealing surface that passes parallel to the closing direction.
[00086] In a further development of the invention, the second closing needle also comprises a cylinder shaped end section. The through opening in the end section of the first closing needle is also cylindrical in shape and is designed so that the second closing needle can be inserted into the through opening in the end section of the first closing needle with a positive fit. In this way, the second closing needle is able to seal the internal material feed channel in the tool cavity, between the formation of a cylindrical sealing surface
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30/74 that passes parallel to the closing direction.
[00087] The closing needles can have lengths of 50 mm to 150 mm, in particular, of about 100 mm. The diameter of the first closing needle is between 8 mm and 20 mm, preferably between 10 mm and 15 mm. The wall thickness of the first cylinder-shaped hollow closing needle can be 0.3 - 1.2 mm, in particular 0.4 to 0.8 mm. The cylinder-shaped outlet opening of the first closing needle may have an axial length of 0.5 - 1.5 mm, in particular, 0.7 - 0.9 mm.
[00088] The diameter of the second closing needle can be 0.6 - 2.5 mm, in particular, 0.8 - 1.2 mm. The cylinder-shaped end section of the first closing needle may have an axial length of 1.2 - 2.4 mm, in particular, from 1.5 to 2.1 mm.
[00089] The diameter of the second closing needle or the wall thickness of the first closing needle, the hollow needle, depends a lot on the plastic component to be processed. Lower injection pressure moldings can be applied to low viscosity material components, that is, with good flow behavior, and the diameter of the material feed channels or the wall thicknesses and the diameter of the nozzle components they can be designed smaller than material components with a higher viscosity, that is, with an unsatisfactory flow behavior they must be processed. Therefore, the diameter or wall thicknesses with the processing of polypropylene (PP) or a thermoplastic elastomer (TPE) should be smaller than with the processing of acid-modified polycyclohexylene dimethylene terephthalate (PCT-A).
[00090] An injection molding tool may comprise one or a plurality of tool cavities, in each case, with a hot groove nozzle. In this way, several
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31/74 cable bodies can be simultaneously manufactured in an injection molding tool. It is advantageous to independently control individual injection molding procedures with their associated tool cavities, although injection molding cycles should preferably be conducted synchronously for the manufacture of several cable bodies. The hot runner nozzles of the individual tool cavities are independently controllable in the present invention. The control of the injection molding procedure is preferably carried out through a control mesh, in which the main temperature also flows. Controls can be, for example, servo controls. In this way, for example, in particular, the opening times for the first or also the second material component can be individually adjusted for each tool cavity. This procedure is based on the discovery that the temperature control of individual tool cavities and hot runner nozzles, where temperature control, among other things, fill quantities or material quantities are also dependent, as a rule, it is not the same across all tool cavities, so the time points for switching from open to closed nozzle condition must be individually adjusted. There are several factors that produce individual control of the required hot runner nozzles. In this way, for example, the length of the hot runner system can be differently long with different hot runner nozzles. In addition, the control of heat savings throughout the complete injection molding tool is also a reason for the individual control of the hot runner nozzles. In this way, the slightest change in temperature in the injection molding tool can have major effects on the manufacturing method.
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32/74 [00091] The invention allows the manufacture of handle bodies, in particular toothbrushes, with different optical appearance formats and functional characteristics. In this way, toothbrushes with great variability in relation to their functional characteristics and their optical appearance can be manufactured thanks to the method, according to the invention, and the associated device. The optical appearance, therefore, is defined by components of differently colored or even transparent material, which visualize the solidified flow structures of the material components. Functional characteristics are achieved by filling the individual sections or regions of the cable body with the first and / or second material component and, as the case may be, additional material components.
[00092] As an additional design variant, there is a possibility to replace the second material component with a gas. In relation to the formation of the body, this means that the first material component completely surrounds the gas (except the injection point) in the final body. A cavity is formed by the gas inside the body.
[00093] Regarding tool technology, the nozzle can be designed equally in relation to the concept. However, certain differences in relation to tolerance and also additional seals in the needle region may be necessary. Nitrogen or noble gases, such as argon, can be applied as gases. [00094] High processing or machining reliability and manufacturing precision are ensured despite great variability. The cable body, according to the invention, can be manufactured in a fully automatic manner.
Brief Description of the Drawings [00095] The subject matter of the invention is later
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33/74 described in more detail by means of the preferred embodiments which are represented in the attached drawings. The Figures, in each case, show toothbrush handle bodies in their creation phase or as complete injection molded parts, as well as injection molding tool parts. Shown schematically in each case in:
Figures 1 to 4 show the manufacture of a cable body, according to a first design variant by means of four schematic representations of a cable body, which represent different method stages in the manufacturing process;
Figures 5 to 8 show the manufacture of a cable body, according to a second design variant by means of four schematic representations of a cable body that represent different method stages in the manufacturing process;
Figure 9 is a plan view of a tool cavity for making a cable body after the injection of the first material component;
Figure 10 is a plan view of a cable body, according to a first design variant, according to Figures 1 to 4, after the injection of the second material component;
Figure 11 is a side view of the cable body, according to Figure 10;
Figure 12 is a plan view of a cable body, according to a type of modality of the second design variant with a through opening;
Figure 13 is a plan view of an additional embodiment of a cable body, according to a type of embodiment of the second design variant with a through opening which is closed by a third material component;
Figure 14 is a plan view of a modality
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34/74 additional cable body, according to a type of modality of the second design variant, with a through opening that is closed by a third material component;
Figures 15a, b are seen in cross-section through the cable body, according to Figure 13, in the thumb rest region;
Figures 16a, b are seen in cross-section through the cable body, according to Figure 14 in the thumb rest region;
Figures 17-18 are seen in cross-section through the cable part of the cable body according to Figures 10 to 14 and 19;
Figure 19 is a plan view of an additional embodiment of a cable body, according to a type of embodiment of the second design variant with a through opening;
Figure 20 is a plan view of an additional modality of a cable body, according to a type of modality of the first design variant, with a through opening:
Figure 21 is a side view of the cable body, according to Figure 20;
Figures 22 to 24 are seen in cross section through the cable body, according to Figures 20 and 21;
Figures 25 to 28 are a cross-sectional view of a hot runner nozzle according to the invention to manufacture an injection molded part;
Figure 29a is a plan view of an additional embodiment of a cable body, according to a type of embodiment of the first design variant with a narrow cross-section;
Figure 29b is a side view of the cable body, according to Figure 29a;
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35/74
Figures 30a-30c are seen in cross section through the cable body, according to Figures 29a and 29b.
[00096] The numerical references used in the drawings and their meanings are listed in a grouped manner in the list of numerical references. Basically in the Figures, the same parts have the same numerical references. The volume ratios of the material components that are represented in the Figures are for illustration only and do not necessarily correspond to the full scale representation of the actual volume ratios.
[00097] Furthermore, the invention is not limited to the modalities or design variants that are represented in the Figures.
Modes for Carrying Out the Invention [00098] Figures 1 to 4 in a purely schematic manner show the manufacture of a cable body 1a, according to the first design variant. To manufacture the cable body shown 1 in the first design variant, a first material component 7 is injected into a tool cavity (not shown) in a first step. The tool cavity or the cable body to be manufactured 1a is a longitudinal component and comprises a cable part 4a, a neck part 3a and a head part 2a. The injection point 10 is arranged in the cable part 4a. The tool cavity in a first step is only partially filled with the first material component 7, at least the cable part of the tool cavity is completely or at least partially filled with the first material component due to the arrangement of the stitch injection 10 in the cable part 4a. The first component of injected material 7 thus assumes the contour of the tool cavity in the cable part 4a (see Figure
1). Figure 1 schematically shows the outline contour of the body molded in the first injection procedure with the first
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36/74 material component 7. The head part 2a and preferably also the neck part 3a of the tool cavity in contrast are not filled with the first material component 7 (compare also Figure 9).
[00099] The injection point shown 10 is indicated in this Figure, as well as in the Additional Figures showing a plan view. The detail corresponds to the position of the injection point 10 in the body with a plan view. This is usually not visible due to its preferred position on the rear side of the cable body, however, it is shown nonetheless, for the purpose of explaining the technology.
[000100] The first component of injected material 7 subsequent to the first injection molding stage cools from the cavity wall to the core, in which a hotter and still flowable core 7 'remains, which is surrounded by a shirt body 7 '' which is no longer flowable. This is schematically represented in Figure 2. The flowable core 7 'is hatched close to the outline contour of the body that is molded in the first injection procedure with the first material component 7. The 7' 'sleeve body that it is no longer flowable it is also recognizable.
[000101] In the additional step, the second material component 8 is injected into the tool cavity of the injection molding tool through the same injection point 10. The result of this step is represented in Figures 3 and 4. The second material component 8 is injected into the bodies shown in Figures 1 and 2 through the injection point 10 and moves the flowable web 7 'in the direction of the head part 2a, which corresponds to the direction of material flow also in the cavity. According to the present modality, the total volume of the tool cavity minus the volume of the first component of
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37/74 injected material 7, as well as the volume of the flowable web 7 'at the point in time of injection of the second component of material 8 is selected, so that the web 7' which is displaced in the head part 2a assumes the volume of the complete head part 2a (see Figure 3). In this way, the head part 2a consists exclusively of the first material component 7 (see Figure 4).
[000102] The second material component 8, among other things, takes the place of the displaced core 7 'in the cable part 4a (replacement), extends to the neck part 3a and exits in the neck part 3a in a similar way to the tongue. The second material component 8, consequently, presses the flowable web 7 'on the body surface and, as a result, is completely surrounded by the jacket body 7' 'and the flowable web 7' of the first material component 7, with exception of the injection point 10. The result of the injection of the second material component is shown in Figures 3 and 4. In Figure 3, it is shown schematically how the different material components are distributed or arranged. The flowable web 7 'shown in Figure 2 is again recognized in Figure 3. As described, the flowable web 7' is displaced towards the head portion 2a. what can also be recognized is that the second material component 8 takes the place of the flowable web 7 '. This is indicated by a hatch.
[000103] Finally, someone can recognize how the final product is divided in relation to the material in Figure 4. After solidification, the 7 '' shirt body and the 7 'flowable web of the preceding process steps form a unit of the first component of material 7 that completely surrounds the second material component 8. The second material component 8 is represented in a hatched manner.
[000104] As mentioned, once again a quantity
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38/74 of the first material component 7 can be injected through the common injection point 10 through a third injection molding step, so that the second material component 8 is also surrounded by the first material component 7 in the injection point region 10 and, in particular, does not come to the surface of the cable body 1a at any location.
[000105] According to the first design variant present, the first and second material components 7, 8 can be of a rigid component of the type described above. The first component of material 7 can be transparent and the second colored or opaque, in order to obtain an optical effect. An interesting optical effect is achieved by this. The first component of material 7 can be a soft component, for example, a TPE, in order to obtain a smooth surface. The second material component 8 can be a rigid component. In this way, the rigid component forms an element that provides cable stability.
[000106] Figures 5 to 8 show in a purely schematic manner the manufacture of a cable body 1b, according to a second design variant. In a first step, a first material component 7 is injected into a suitable tool cavity (not shown) to manufacture the cable body 1b in the second design variant. The tool cavity or cable body 1b to be manufactured is also a longitudinal component and comprises a cable part 4b, a neck part 3b and a head part 2b. The injection point 10 is arranged in the cable part 4b. The tool cavity in a first step is only partially filled with the first material component 7, in which at least the cable part is complete or at least partially filled due to the arrangement of the injection point 10 in the cable part 4b. The first component of injected material 7
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39/74 thus assumes the contour of the tool cavity in the cable part 4b (see Figure 5). Figure 5 shows schematically the outline contour of the body that is molded with the first material component in the first injection procedure. The head part 2b and preferably also the neck part 3b of the tool cavity, in contrast, are not filled with the first material component 7 (compare Figure 9).
[000107] The first component of injected material 7 subsequently cools in the first injection molding step, from the cavity wall towards the core, in which a hotter and still flowable core 7 'remains, and this is surrounded by a 7 '' shirt body that is no longer flowable. This is shown schematically in Figure 6. The flowable web 7 'is shown hatched close to the outline contour of the molded body with the first material component 7 in the first injection procedure. The 7 '' no longer flowable shirt body can also be recognized. In comparison with the first design variant, according to Figures 1 to 4, here the cooling process has already advanced further and the flowable web volume 7 'is consequently less, or the wall thickness of the shirt body is no longer flowable 7 '' is bigger.
[000108] In a second step, the second material component 8 is injected into a tool cavity of the injection molding tool through the same injection point 10. The result of this step is represented in Figures 7 and 8. The second component of material is injected into the body shown in Figures 5 and 6 through the injection point 10 and moves the flowable web 7 'in the direction of the head part 2b which corresponds to the direction of material flow in the tool cavity. According to the present modality, the total volume of the tool cavity minus the
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40/74 first component of injected material 7, as well as the volume of the flowable core 7 'at the time of injection of the second component of material 8 is selected, so that the displaced core 7' 'comes out on the front cable part 4b or the neck part 3b and form only a shirt surface that surrounds the second material component 8 (see Figure 7). The volume of the web 7 'here is less than the volume of the head part 2b. For this reason, the second material component 8 in the front section of the cable part 4b or the neck part 3b leaves the socket through the first material component 7 and penetrates the surface or cavity wall. The second component of material 8 which came forward now fills the complete volume of the head part 2b and, preferably, also of the neck part 3b completely or in parts (see Figure 8). In this way, the head part 2b and, as may be the case, the neck part 3b consists exclusively of the second material component 8. The second material component 8, moreover, assumes the space of the displaced web 7 'in the part of cable 4b, however, is still surrounded by a jacket body 7 '' of the first component of material 7. The second material component 8 of cable body 1b is no longer completely surrounded by the jacket body 7 '' of the first component of material 7. The result of the injection of the second material component is shown in Figures 7 and 8. This is shown schematically in Figure 7 on how the different parts of material are distributed or arranged. The flowable core 7 'shown in Figure 6 can be recognized again in Figure 7. It is moved in the direction of the head part 2a, as described, however, only until the connection with the penetration site of the second material component 8 a from the shirt body no longer flowable 7 ''. The second material component 8 that appears in place of the flowable web 7 'and,
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41/74 then, leaves the shirt body no longer flowable 7 '' and forms the head part 2b must be equally recognized. This second component is also indicated by a hatch. Finally, the final product in relation to the division of materials is shown in Figure
8. After solidification, the jacket body 7 '' and the flowable web 7 '' of the preceding process steps form a unit of the first material component 7 that surrounds the second material component 8. The second material component is represented in a hatched manner, as long as it is not located on the surface of the cable body 1b, and is no longer subsequently hatched.
[000109] As mentioned, again the limited quantity of the first material component 7 can be injected through the common injection point 10 by means of a third injection molding step, so that the second material component 8 is also surrounded by the first material component 7 in the region of the injection point 10.
[000110] According to the present second design variant, the first and second material components 7, 8 can be of a rigid component of the type described above. The first material component 7 can be transparent and the second colored or opaque, or vice versa, in order to obtain an optical effect. An interesting optical effect is achieved by this. The first component of material 7 can be a soft component, for example, a TPE, in order to obtain a smooth surface in the cable region, and the second component of material 8 can be a rigid component. In this way, the rigid component forms an element that endows the cable with stability and finally also at least partially forms the neck part 3b and the head part 2b and, consequently, ensures functionality.
[000111] Basically, someone can calculate mathematically if the
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42/74 the first or the second design variant is carried out. The parameters that are used for computing are the total volume of the tool cavity, the total volume of the first material component, as well as the volume of the flowable web. In this way, the volume of the flowable web is time dependent. That is, the more it is expected or cooled between injection cycles, the lower its volume, since it cools, that is, it solidifies and is no longer flowable. Then, in each case, the residual volume in the tool cavity is compared to the volume of the flowable web, in the evaluation in relation to the design variant. [000112] The first design variant that is shown in Figures 1 to 4, results from the following relationship: the total volume of the tool cavity minus the total volume of the first component of injected material is less than the flowable web that is displaced by the second material component.
[000113] The second design variant that is shown in Figures 5 to 8 results from the following relationship: the total volume of the tool cavity minus the total volume of the first component of injected material is greater than the flowable web that is displaced by the second component of material.
[000114] The difference between the two design variants in relation to the volume ratios can be recognized by comparing Figures 4 and 6. With the first design variant, the flowable web 7 'adopts more space than with the second variant of project. This means that more material is replaced as the flowable volume is even greater.
[000115] Figure 9 shows the tool cavity 21 of an injection molding tool after a first complete injection molding procedure with a view of the mold separation on the mold insert. Basically, this corresponds to a view over the tool cavity 21, given a tool
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43/74 open injection molding after the first injection molding procedure. The tool cavity 21 has a first material component 7 which is injected in the first injection molding step and which corresponds to the represented material component 7, according to Figures 1 and 5. The body is represented in a hatched manner. In this way, it can be clearly recognized that the tool cavity 21 is not completely filled in the first injection molding procedure. At least part of the region of the tool cavity 21 remains free. The contour of the tool cavity 21 can be recognized. Unhatched regions are not yet filled with material. The material flow direction M is also displayed. It is directed from the injection point 10 towards the head part 2a. After the cable part 4a is filled, the neck part 3a and the head part 2a are also filled.
[000116] Figure 10 shows a plan view of the cable body 1a according to the first design variant according to Figure 4. This is manufactured according to the steps shown in Figures 1 to 4. The receiving holes bristles 5a, into which the toothbrush bristles are inserted, are arranged in the head part 2a of the cable body 1a. The bristle receiving holes 5a in the present form, however, are not an essential feature of the invention. The second material component 8 which is located in the cable body 1a and which is completely surrounded by the first material component is shown in a crosshatched manner. In addition, the second material component 8 comes out in a manner similar to the tongue, that is, it does not end abruptly.
[000117] Figure 11 shows the cable body 1a according to Figure 10 in a side view. The mold separation line 12, at the
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44/74 over which the tool cavity was opened to remove the injection mold part from the mold is particularly visible from the side view. The mold separation line 12 is laterally arranged in a plan view of the cable body 1a. The mold separation line 12 passes without a break around the complete body. It should be recognized that the second material component 8 which is disposed on both sides of the mold separation line 12, thus, passes beyond it. It is quite recognizable in the side view how the shape of the second material component 8 follows the geometry of the external contour at a distance that corresponds to the wall thickness and, also, the tongue-like extension of the second material component 8 can be easily recognized.
[000118] Figures 12 to 14 show three cable bodies 1c, 1d, 1e in a plan view, which are manufactured according to a type of modality of the second design variant. The cable body 1c shown in Figure 12 can be used as an independent cable body without the application of an additional material component being required, or it can serve as a base body for the cable body 1d and 1e. The cable bodies 1c, 1d, 1e also comprise a head part 2c, 2d, 2e, a neck part 3c, 3d, 3e, as well as a cable part 4c, 4d, 4e. The injection point 10 is also arranged on the cable part 4c, 4d, 4e and preferably on the rear side of the cable part 4c, 4d, 4e.
[000119] A present embodiment of the second design variant is characterized by a through opening 11 which is located in the front cable part 4c, 4d, 4e and is arranged in the head part 3c, 3d, 3e. The through opening 11 extends from the anterior side to the posterior side and is bounded by two parts of lateral arms 6c, 6d, 6e. The cable bodies 1c, 1d, 1e or their part of
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45/74 head 2c, 2d, 2e comprise bristle receiving holes 5c, 5d, 5e for receiving the bristles which are fixed in the bristle receiving holes 5c, 5d, 5e by means of anchoring. The bristle receiving holes in a present embodiment, however, are not a necessary feature of the invention.
[000120] The manufacture of cable bodies 1c, 1d and 1e is basically carried out in a similar way as the design variant according to Figures 5 to 8, the only difference being that the tool cavity does not yet have a insertion core that defines the through opening of the cable body to be produced, and around which the material components 7, 8 flow in the direction of material flow between the division into two arm parts 6c, 6d, 6e and a subsequent reunification.
[000121] The first material component 7 in the cable part 4c, 4d, 4e and at least partially in a section part of the arm parts 6c, 6d, 6e which connects to the cable part 4c, 4d, 4e shirt body adjoining a core of the second material component 8. The material core that exits the cable part 4c, 4d, 4e is equally divided into two arms parts that are conducted around the through opening (see Figure 12) . The division occurs because the cooling of the cavity wall also applies to the insertion core and, thus, the flowable web also propagates in the arm parts 6c, 6d, 6e.
[000122] The second material component 8, thus, here also takes the place of the displaced core 7 'in the cable part 4c, 4d, 4e, however, it is still surrounded by a shirt body of the first material component 7. As mentioned, once again the limited quantity of the first material component 7 can be injected through the common injection point 10 via a third injection molding step, so that the second
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46/74 material component 8 is also surrounded by the first material component 7 in the region of the injection point 10.
[000123] The second material component 8 of the cable body 1c, 1d, 1e according to Figures 12, 13 and 14 in the region of the two arms parts leaves the socket through the first material component 7 and appears on the surface of the cable body 1c, 1d, 1e along the entire periphery. Consequently, the connection of the neck part 3c, 3d, and the head part 2c, 2d, 2e is formed completely by the second material component 8.
[000124] The output of the second material component 8 in the region of the arm parts 6c is deliberately selected. The region of the through opening 11 is peripherally injected at least partially with a third component of material 9 for the purpose of forming a thumb rest 13, as is evident from the modality, according to Figures 13 and 14. The peripheral injection it can be a cover of the arm parts 6c towards the through opening 11 (see Figure 13) or a cover around the cable body 1e in the region of the through opening (see Figure 14). Peripheral injection with the third material component 9 thus has two functions. On the one hand it serves to form a thumb rest 13 as a resting surface and, on the other hand, it serves to cover the transition region between the first and the second material component in the region of the surface. In the variant shown in Figure 12, the geometry of the through opening 11 or the geometry around the through opening 11 is selected, so that these geometries form a thumb rest. In the case where the through opening 11 is provided with a third material component, the geometry of the body that lies below it does not necessarily need to be designed in such a way.
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4ΊΠ4 [000125] The position of the penetration site is subject to a certain tolerance among other things due to fluctuations in the characteristics of the plastics, the thermal equilibrium in the injection molding mold or in the hot runner system and the measurement of the second component material material 8 and the first material component Ί. The penetration site can vary in the region of the longitudinal geometric axis. The position on the arm parts can also be uneven. Because of this, it is important, for aesthetic reasons, that this transition region can be covered, for example, by a third component of material 9.
[000126] According to the present type of modality of the second design variant, the first and second material components Ί, 8 can be of a rigid component of the type described above. Someone also predicts that the second material component 8 is a rigid component and the first material component Ί is a thermoplastic elastomer of the type mentioned above. In order to obtain an optical effect, the first material component Ί may be transparent and the second material component 8 may be colored, that is to say, opaque, or vice versa. An interesting optical effect is achieved through this. The first component of material 8Ί can be a soft component, for example, a TPE, in order to obtain a smooth surface in the cable region, and the second component of material 8 can be a rigid component. In this way, the rigid component forms an element that endows the cable with stability and finally also at least partially forms the neck part 3b and the head part 2b and, consequently, ensures functionality.
[00012Ί] The second material component 8 which is located within the first material component Ί is shown in a crosshatched manner in Figures 12 to 14. The neck part 3c, 3d, 3e and a
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48/74 head part 2c, 2d, 2e also consist of the second material component 8, however, in this position, they are located on the surface of the cable body 1c, 1d, 1e and are therefore not represented in a dashed manner .
[000128] Figure 15a shows a cross section through the cable body 1d according to Figure 13 along line B1-B1 in the cable side region of the thumb rest 13. The two arms parts 6d comprise a core of the second material component 8 which is completely confined by the first material component 7. The outer side of the arm parts 6d that face the through opening 11, moreover, is lined with a third material component 9. Thus, the through opening is completely filled with the third material component 9.
[000129] Figure 15b shows a cross section through the cable body 1d, according to Figure 13 along line A1-A1 in the lateral region of the thumb rest head. The second material component 8 in the direction of material flow or in the direction of the head part 2d has already completely left the socket through the first material component 7 at the height of the cable body 1d and completely fills the volume of the arm parts 6d. The outer side of the arm parts 6d which faces the through opening 11 here is also also covered by a third material component 9, and the through opening is completely filled with the third material component 9.
[000130] A comparison of Figures 15a and 15b shows that the composition of the cross sections in relation to the material components or the cross section areas of the material components change. Whereas in Figure 15a three material components are visible in cross section, in Figure 15b these are
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49/74 only two material components. The sharing of the first material component 7 in the cross section decreases towards the head part of the cable body, until it is finally zero. Consequently, the second material component 8 on the cable part or on the cable part side is confined by the first material component 7, while this is then covered by the third material component 9 on certain surface parts on the part side. head and is partially exposed.
[000131] Figure 16a shows a cross section through the cable body 1e, according to Figure 14, along line B2-B2 in the cable side region of the thumb rest 13. The two arms parts 6e comprise a core of the second material component 8 which is completely surrounded by the first material component 7. The arm parts 6e as such are completely covered by the third material component 9 and the through opening is completely filled with the third material component 9. A outer side of the arm parts 6e is thus coated with a third component of material 9 along the entire periphery. The penetration site of the second material component 8 from the first material component 7 can be completely covered in this way.
[000132] Figure 16b shows a cross section through the cable body 1e, according to Figure 14 along line A2-A2 in the lateral region of the thumb rest head 13. The second material component 8 in the direction of material flow or in the direction of the head part 2e has completely left the socket through the first material component 7 at this point in the cable body 1e, and completely fills the volume of the arm parts 6e. The arm parts 6e, as such, are completely coated with a third component of material 9 and the through opening is
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50/74 completely filled with the third material component 9. With this, the outer side of the arm parts 6e is covered by a third material component 9 along the entire periphery. The outlet location of the second material component 8 of the first material component 7 can be completely covered thereby. A cable body with a regular lock can be created in this way, since the penetration site that is overloaded by a tolerance, is covered in this way.
[000133] A comparison of Figures 16a and 16b shows that the composition of the cross sections in relation to the material components or the cross section areas of the material components changes. Whereas in Figure 16b three material components are visible in cross-section, there are only two material components in Figure 16b. The sharing of the first material component 7 in the cross sections reduces towards the head part of the cable body, until it is finally zero. Consequently, the second material component 8 on the cable part or on the cable part side is confined by the first material component 7, then considering that it is confined by the third material component 9 on the head part side.
[000134] The application of a third component of material 9 which is shown in the Figures can be carried out in different ways. It is shown in the Figures that the third material component 9 is fixed to the body through a through opening 11 and also confines this body at least in certain embodiments. The third component of material 9 can certainly also be applied, without it being guided through a through opening 11. The third component of material 9, for example, can be applied on the surface of existing parts by means of
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51/74 material adjustment characteristics. In addition, it is also possible to allow positive adjustments that allow application to the surface, through geometric body designs.
[000135] In addition, the third material component can be arranged on all parts of the cable body, that is, on the head part, neck part and / or part of cable. The third material component, in this way, for example, on the head part of a toothbrush can serve to form a tongue cleaner or massage elements and soft elastic cleaning. In addition, the third material component can be used for ergonomic or shape aspects. Certainly, different applications can be combined.
[000136] Figure 17 shows a cross section through the cable body 1c, 1d and 1e, according to Figures 10, 12, 13 14 and 19 along the CC line in the rear end section of the cable part 4c, 4d, 4e. The cable part 4c, 4d, 4e comprises a core of the second material component 8 which is completely confined by the first material component 7.
[000137] Figure 18 shows a cross section through the cable body 1c, 1d e1e, according to Figures 10, 12, 13, 14 and 19 along the DD line in the rear end section of the cable part 4c, 4d, 4e at the point of injection point 10. The cable portion 4c, 4d, 4e comprises a core of the second material component 8 which is surrounded by the first material component 7. An opening through the socket is formed at the injection point 10, through which the opening of the second material component 8 reaches the surface. The opening typically represents the injection point, preferably cylindrical. Figure 18 shows what the injection point looks like if the first component of material 7 is not injected a second time. As already described, once again
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52/74 injects the first material component 7 after injecting the second material component 8, then the cylindrical opening can be succeeded through the shirt body which is closed again with the material of the first material component 7. The second component of material 8 may then not reach the surface.
[000138] It is recognizable in the cross-sectional representations of Figures 15 to 18, as well as, 22 to 24 as the wall thickness of the shirt body of the first material component 7 is formed. It has a thickness of 0.5 mm - 5 mm and, in particular, 1.5 mm - 3 mm. The wall thickness is basically dependent on cooling.
[000139] Figure 19 shows an additional modality type of the second design variant. The cable body 1f also comprises a head part 2f, a neck part 3f, as well as a cable part 4f. The injection point 10 on the cable part 4f is also visible. In addition, the type of modality is characterized by a through opening 11 arranged in the neck part 3f, in the front cable part 4f. The through opening extends from the anterior side to the posterior side and is delimited by two parts of lateral arms. In addition, the cable body 1f comprises bristle receiving holes 5f for receiving the bristles. The bristle receiving holes 5f, 5g in the present case, however, are also not an essential feature of the invention.
[000140] The cable body 1f is basically manufactured in a similar way as the second design variant, according to Figures 5 to 8, except that the tool cavity does not yet contain an insertion core that defines the through opening 11 of the cable body 1f to be produced, and around which the material components 7, 8 flow between the division into two arm parts 6f and the subsequent reunification in the direction
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53/74 material flow.
[000141] The first material component 7 in the cable part 4, as well as, in the arms parts 6f forms a shirt body that abuts a material core of the second material component 8. The material core that exits the part of cable 4f in the direction of the heat part 2f is equally divided into two arms parts which are conducted around the through opening 11. The second material component 8 thus takes the place of the displaced core 7 'in the cable part here 4f, however, here is still surrounded by a shirt body of the first material component 7.
[000142] As mentioned, a limited amount of the first material component 7 can be injected through the common injection point 10 via a third injection molding step, so that the second material component 8 is surrounded by the first component of material 7 also in the region of the injection point 10.
[000143] The two arms parts of the second material component 8 of the cable body 1f, according to the embodiment, according to Figure 19, subsequently reunite in the through opening 11 towards the head part 2f, so that a common line surrounded by the first material component 7 propagates towards the head part 2f. The second material component 8 does not leave the socket here through the first material component 7 until subsequently the through opening 11, after the reunification of the arms parts and the material cores, and exits to the surface of the cable body 1f along the entire periphery. This can be done, for example, before or on the neck part 3f. Consequently, the connection of the neck part 3f or at least one section thereof, as well as the head part 2f are completely formed by the second material component 8.
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54/74 [000144] Compared to Figure 12, the position of the penetration site where the second material component 8 exits the first material component 7 is displaced towards the head part 2f. In the present case, the position of the penetration site depends on the material quantity that is injected into the tool cavity in the first injection molding step. Since the location of penetration in the cable body 1f of Figure 19 is closer to the head part 2f, and the material core of the second material component 8 is identical to that of Figure 12, then, comparing to Figure 12 it can be said that with the body, according to Figure 19, more material was placed in the tool cavity in the first injection molding procedure.
[000145] In addition, the location of the outlet of the second material component 8 of the first material component 7 can be changed by the cooling time or the time between the injection of the first material component 7 and that of the second material component 8. If an identical cable body is used and the same amount of material 7 is injected in relation to the first material component, then the penetration site is closer to the head with a shorter cooling time than with a cooling time. longer cooling. This is due to the fact that with a shorter cooling time, the second material component replaces a lot of material in the cable part and less of the second material flow components in the free parts of the tool cavity, since the first component of material has already been moved there. With a longer cooling time, the web 7 ', which is flowable only in a small amount, is found in the cable part, which causes the second material component 8 that replaces little material in the cable and mainly fills the free tool cavity, since generally little material from the
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55/74 first material component 7 continues to be displaced. These considerations also show the fact that the first design variant integrates with the second design variant in a flowable way, and everything depends essentially on the cooling time. This is usually the case where the complete volume is always the same, which means that as a whole, the first and second material components 7, 8 together are always placed in the tool cavity with the same amount of material. In the present case, even the shirt parts are equally large. What changes in each case is the distribution of material in the cable body.
[000146] With the injection molding process of a cable body, according to the first design variant, the cooling time after the introduction of the first material component 7 before introducing the second material component 8 is between 8 and 20 seconds. With the second design variant, the cooling time is between 20 and 35 seconds.
[000147] The two material components 7, 8 according to this embodiment, can be of a rigid component of the type described above. Someone also predicts that the second material component 8 is a rigid component and the first material component 7 is a thermoplastic elastomer of the type described above, or vice versa. The first material component 7 can be transparent and the second material component 8 can be colored or opaque, or vice versa, in order to obtain an optical effect. An interesting optical effect is achieved by this. The first component of material 7 can be a soft component, for example, a TPE, in order to obtain a smooth surface in the cable region, and the second component of material 8 can be a rigid component. In this way, the rigid component forms an element that endows the cable with
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56/74 stability and finally also at least partially forms the neck part 3b and the head part 2b and, consequently, ensures functionality.
[000148] The second material component 8 located within the first material component is shown in a crosshatched manner in Figure 19. The head part 2f and at least partially also the neck part 3f consist of the second material component 8 However, this position is located on the surface of the 1g cable body and, therefore, is not represented in a dashed manner.
[000149] Figures 20 and 21 show an additional modality type of cable bodies 1g according to the first design variant. The cable body 1g also comprises the head part 2g, the neck part 3g as well as the cable part 4g. The injection point 10 is also arranged on the cable part 4g. The present type of modality is also characterized by a through opening 11 arranged in the neck part 3g, in the front cable part 4g. The through opening 11 extends from the anterior side to the posterior side and is surrounded by two parts of lateral arms 6g. The cable body 1g comprises bristle receiving holes 5g for receiving the bristles. The 5g bristle receiving holes in the present form, however, are not a necessary feature of the invention.
[000150] The manufacture of the 1g cable body is basically carried out in a similar way as the first design variant, according to Figures 1 to 4, just because the tool cavity now comprises an insertion core that defines that the through opening 11 of the cable body 1g is produced and around which the material components 7, 8 flow between the division into two arm parts 6g and the subsequent reunification in the direction
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57/74 material flow.
[000151] The first component of material 7, in contrast to the very similar modalities, according to Figures 12 to 14 and 19, in the cable part 4g, as well as in the arms parts 6g forms a shirt body that abuts a material core of the second material component 8 extending from the cable part 4g towards the head part 2g is equally divided into two arms parts which are conducted around the through opening 11 and then do not come together. The first material component 7 with this design forms a protective layer around the second material component 8 that does not allow the second material component 8 to reunite after the through opening 11. This also means that the second material component 8 it does not come out through the first material component.
[000152] The second material component 8, thus, here also takes the place of the displaced core 7 'in the cable part 4g and, meanwhile, it is still surrounded by a shirt body of the first material component 7. As mentioned, again a limited amount of the first material component 7 can be injected through the common injection point 10 in a third injection molding step, so that the second material component 8 is surrounded by the first material component 7 also in the region of the injection point 10.
[000153] In the embodiment, according to Figure 20, the two parts of lines of the second material component 8 do not join subsequently to the through opening 11 in the direction of the head part 2g. In contrast, these pass parallel at a distance close to each other at the neck part 3g. The two parts of lines come out in a similar way to the tongue in the neck part 3g, without the second component of material 8, in each case,
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58/74 leaving the socket through the first material component 7. Consequently, the head part 2g is completely formed from the first material component 7. This embodiment is characterized by the particularly aesthetic effect of the parts of lines that pass in parallel. The two parts of lines have a distance of 0.3 mm to 3 mm, preferably 0.5 mm to 1.5 mm. They come out in an asymmetrical manner, which means that they are not equally long and, therefore, their ends have a maximum distance of 10 mm from each other, preferably 5 mm in the longitudinal direction of the geometric axis.
[000154] In the Figures shown, the through opening is symmetrically projected in relation to the material flow direction. It is also possible to design the through opening in an asymmetrical manner. This leads to the fact that the distances between the line parts, as well as the distances between the ends of the line parts can be infinitely varied. Of course, it is also possible to drive the second material component 8 to the head part 2g.
[000155] Figure 21 shows a lateral cross-section through the cable body 1g, according to Figure 20. The mold separation line 7 is also observed. It can be recognized that the second material component 8 is disposed on both sides of the mold separation line 12, thus passing beyond it.
[000156] The region of the through opening 11, in the types of modality shown in Figures 19, 20 and 21 can be peripherally injected (not shown) with a third component of material 9, in a manner analogous to the modality, according to the Figures 13 and 14, for the purpose of forming a thumb rest 13. The peripheral injection can be a covering of the arm parts 6f, 6g towards the through opening 11 or a covering around the
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59/74 cable body 11, 1g in the region of the through opening.
[000157] The two material components 7, 8 according to this modality, can be of a rigid component of the type mentioned above. One can also predict that the second material component 8 is a rigid component and the first material component 7 is a thermoplastic elastomer of the type described above, or vice versa. The first material component 7 can be transparent and the second material component 8 can be colored or opaque, or vice versa, in order to obtain an optical effect. An interesting optical effect is achieved by this. The first component of material 7 can be a soft component, for example, a TPE, in order to obtain a smooth surface in the cable region, and the second component of material 8 can be a rigid component. In this way, the rigid component forms an element that provides cable stability and finally also at least partially forms the neck part 3b and the head part 2b and, consequently, ensures functionality. The second material component 8 located in the first material component 7 is shown in a crosshatched manner in Figure 20 and
21. The head part 2g consists exclusively of the first material component 7. The neck part 3g consists at least partially of the first material component 7.
[000158] Figure 22 shows a cross section through the neck part 3g of the cable body 1g, according to Figure 20 along line E-E. The cross-sectional view shows two parts of lines of the second material component 8 that are completely confined by the first material component 7 and, in addition, are separated from each other by means of a mesh of the first material component 7. The hatches Different components of different materials are represented in the section.
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60/74 [000159] Figure 23 shows a cross section through the cable body 1g, according to Figure 19 or 20, along the line FF in the region of the thumb rest 13. The two arms parts 6g comprise a core of the second material component 8 which is completely confined by the first material component 7. The material components of the arm parts that are represented in the section are represented in a hatched manner. The through opening is not represented in a dashed manner.
[000160] Figure 24 shows a cross section through the cable part 4g of the cable body 1g, according to Figure 20, along the line G-G. The part of cable 4g on its rear side comprises an indentation. The second material component 8 which is completely confined by the first material component 7 thus comprises two kidney-like core parts which are connected to each other via a connecting mesh. Figure 24 shows how the cooling of the first material component works. The body cools from the outer to the inner surface. The cooling follows the external geometry. In uniform cooling, as shown, a jacket body no longer flowable 7 '' or in the final product a jacket body of the first material component 7 of a regular wall thickness is present everywhere. The second material component 8, therefore, is disposed inside the body. In the present cross-section, if the cooling time of the first component of selected material is longer than that selected for the shown cable body, it is possible that the 7 '' no longer flowable jacket body will unify in the intermediate region. In this way, two parts of lines that consist of the second material component 8 that is formed can be replaced, which are separated by a no longer flowable jacket body 7 ''.
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61/74 [000161] Figures 25 to 28 show cross-sectional views of a hot runner nozzle 23, according to the invention, to manufacture an injection molded part by means of a co-injection method, with which at least two material components are injected one after the other into a tool cavity 21 by means of a common injection point. The hot channel nozzle 23 comprises a channel (channel) with a channel wall 33 that exits into a cylinder shaped outlet opening 28. The outlet opening 28 exits the tool cavity 21 and preferably has a cut circular cross section. The channels of the hot channel nozzle 23 are preferably heated exclusively through the channel wall 33 from the outside.
[000162] The hot runner nozzle 23 is preferably positioned in relation to the tool cavity 21, so that the closing direction of the needles V is at an angle of 85 ° to 90 ° with respect to the longitudinal geometric axis of the cavity K. tool
[000163] The closing needles and material feeding channels are preferably designed in a symmetrically rotational manner (not the injection molding tools themselves). In the present case, this means that the corresponding parts or volumes in Figures 25 to 28, due to the sectional representation, are recognizable to the left and right of the second closing needle 25.
[000164] A first closing needle 24 which together with the channel wall 33 forms an external material feed channel 26 is axially introduced into the channel (channel). The external material feed channel 26 has an annular shape in the region of the closing needle 24. The first closing needle 24 is designed as a hollow needle and comprises an opening
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62/74 axial through 29 forming an internal material feed channel 27. The first closing needle 24 has a cylinder-shaped end section 30. This is preferably designed in a circularly cylindrical manner. The end section 30 together with the through opening 29 forms a hollow cylindrical section, wherein the through opening 29 in the mentioned end section 30 preferably also has a circular cross section. The cylinder-shaped end section 30 of the first closing needle 24 engages the cylinder-shaped outlet opening 28 with a positive adjustment for closing the external material feed channel 26.
[000165] A second closing needle 25 that is designed in a cylindrical shape engages the through opening 29. The internal material feed channel 27 is also designed in an annular manner at the height of the second closing needle 25. The second closing needle 25 comprises at least one cylindrical shape, in particular the cylinder-shaped circular end section 31. However, it is particularly preferable to be completely designed in a cylindrical shape or in a circular cylindrical shape. The second closing needle 25 with its end section 31 positively engages the cylinder-shaped hollow end section 30 of the first closing needle 24 to close the internal material feed channel 27 in the region of the through opening 29 .
[000166] Figures 25 to 28 show the different positions of the closing needles 24, 25 and the way they are located during the manufacturing process.
[000167] According to Figure 25, the first closing needle 24 engages the cylinder-shaped outlet opening 28 and thus closes the external material feed channel 26.
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Simultaneously, the second closing needle 24 engages the cylinder-shaped hollow end section 30 of the first closing needle 24 and thus closes the inner material feed channel 27. The hot channel nozzle 23, thereby In this way, it is completely closed, in which the first and the second closing needle 24, 25 with the side faces are aligned with the cavity wall in the region of the outlet opening. The moment when the hot runner nozzle 23 is in the position shown in Figure 25 can be deduced from the process course which is later specified.
[000168] According to Figure 26, the first closing needle 24 is retracted outside the cylinder-shaped outlet opening 28 and releases the external material feed channel 26. Simultaneously, the second closing needle 25 engages in the cylinder-shaped hollow end section of the first closing needle 24 and thus closes the internal material feed channel 27. The hot channel nozzle 23 is thus only open for the material feed of the channel external material feed 26. Material flows are fed into the annular channel in a flow direction Ra along the first closing needle 24 towards outlet opening 28 and injected through outlet opening 28 in flow direction Rs in the tool cavity 21. The flow direction Rs here is parallel to the closing direction V of the closing needles 24, 25 and parallel to the longitudinal geometric axis of the closing needles. For example, the first material component can be injected into the tool cavity 21 at the beginning of the injection molding cycle with this nozzle configuration. The moment when the hot runner nozzle 23 is in the position shown in Figure 26 can be deduced from the subsequently specified process stroke.
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64/74 [000169] According to Figure 27, the first closing needle 24 engages the cylinder shaped outlet opening 28 and thus closes the external material feed channel 26. The second closing needle 25 , however, it is retracted outside the cylinder-shaped hollow end section 29 of the first closing needle 24 and thereby releases the internal material feed channel 27. The hot channel nozzle 23 is thus only opened for the material feed of the internal material feed channel 27. The material flows are fed into the internal channel in a flow direction Ri along the second closing needle 25 towards the outlet opening 28 and injected through the opening of outlet 28 in the direction of flow Rs into tool cavity 21. For example, the second material component can be injected into tool cavity 21 in a subsequent step of the injection molding cycle with this nozzle will fit. The moment when the hot runner nozzle 23 is in the position shown in Figure 27 can be deduced from the subsequently specified process stroke.
[000170] Preferably, the material component with the highest melting point is fed through the external material feed channel 26, since it is directly heatable through the channel wall 33. The material component with the lowest melting point is preferably fed through the internal material feed channel 27, since the heating is indirect and also implies certain losses. If, for example, a PCT-A is applied to a first component 7 and a PP as a second component 8 to the cable body, then it is fine if the PCT-A with the highest melting point is fed through the external material feed channel 26, and the PP with the lowest melting point through the channel
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65/74 internal material supply 27.
[000171] Temperature adjustments are important. This may be the case where not every infinite material combination can be processed. The temperature in the internal material feed channel 27 must also be controlled externally since it heats only from the outside. If the temperature settings cannot be adhered to, then the plastic material can decompose.
[000172] Also, it is possible to process the material with the highest melting point in the internal material feed channel 27 if the temperature conditions can be adjusted accordingly and the respective material components allow this.
[000173] Preferably, the first material component that corresponds primarily to the injected material component has a higher melting point than the second material component. This ensures the full flow capacity of the second material component, even if the first material component in the tool cavity 21 has already been cooled down a little and solidified like a jacket body.
[000174] The process stroke in relation to the hot groove nozzle positions 23 which are shown in Figures 25 to 27, given a closed tool cavity, is designed as follows:
1. the hot channel nozzle 23 is completely closed (see Figure 25)
2. the external material feed channel 26 is opened (see Figure 26)
3. the hot channel nozzle 23 is completely closed (see Figure 25)
4. the internal material feed channel 27 is opened (see Figure 27)
Petition 870190133718, of 12/16/2019, p. 75/97
66/74
5. the hot runner nozzle 23 is completely closed (see Figure 25).
[000175] In this way, it is also possible that the internal material feed channel 27 is first opened and that this material is fed and the material of the external material feed channel 26 is only subsequently fed into it, depending on the configuration of the product in question. material components. This means that steps 2 and 4 can be switched.
[000176] In the injection molding of the first material component 7, the material feed channel is opened, the first material component 7 is injected into the cavity, and the material feed channel is subsequently closed again. No holding pressure is required as the tool cavity 21 is not completely filled with the first material component 7. A holding pressure is applied in the injection molding of the second material component 8 which completely fills the tool cavity. 21. For the hot runner nozzle, this means that it remains open, so that the holding pressure that is accumulated by the injection assembly on the material component, acts on the material component in the tool cavity 21. The hot channel 23 is closed again when the holding pressure is no longer required due to the process stroke.
[000177] Step 3 corresponds to the cooling time that the first material component 7 requires, so that a no longer flowable jacket body 7 '' can be formed. In addition, step 5 also corresponds to the cooling time, however, so that the body at the end of the cooling time has sufficient stability, so that it can be removed from the tool cavity.
Petition 870190133718, of 12/16/2019, p. 76/97
67/74 [000178] An important factor is the respective injection pressure of the material components. The injection pressure for the first material component 7 is the same as the manufacture of a conventional handle body, in particular, for a toothbrush. As described, no holding pressure is built up after feeding material. The injection of the second material component 8 in relation to pressure is also designed with respect to the standard injection molding processes of the cable bodies, in particular toothbrushes. The holding pressure is then applied to the second material component 8.
[000179] The size of the injection pressure cannot generally be defined, since it depends on different factors. These factors are, for example: material characteristics, nozzle geometry or the size of the inlet cross-section (outlet opening of the hot channel nozzle, through opening of the hot channel nozzle). The injection pressure increases if the inlet cross-section becomes smaller, for example.
[000180] According to Figure 28, the first closing needle 24 is retracted outside the cylinder-shaped outlet opening 28 and releases the external material feed channel 26. The second closing needle 25 is also retracted from from the cylinder-shaped hollow end section 30 of the first closing needle 24 and releases the internal material feed channel 27. The hot channel nozzle 23 is thus opened to feed material from the inside, as well as forming the external material feed channel 26, 27. The first and second material components can be injected simultaneously into the tool cavity with this nozzle setting. Figure 28 represents merely a technical possibility of a nozzle adjustment. This nozzle adjustment in relation to the present invention
Petition 870190133718, of 12/16/2019, p. 77/97
68/74 has a subordinate significance, since the first and second material components are preferably injected in a strictly sequential manner and not simultaneously or overlapping.
[000181] The cylinder-shaped sealing surfaces 34 for the first closing needle 24 and the second closing needle 25 are parallel to the closing direction V. Since the closing direction V is now parallel to the geometric axis longitudinal length of the closing needles 24, 25, the thermal expansion of the closing needles 24, 25 has practically no influence on the quality of the closing seal. The closing needles 24, 25, for example, can have a length of about 100 mm, considering that their diameter can be, for example, a maximum of 2.5 mm. If the injection molding tool is now operated at different temperatures depending on the plastic applied, then the lengthening expansion of the closing needle, which can be significant, in such a case, may have no influence on the seal. This is ensured by the hot runner nozzle present 23, since the expansion of the length of the closing needles 24, 25 has no influence on the formation of the sealing surfaces 34. The thermal expansion of the closing needles 24, 25 transversely in relation to the longitudinal geometric axis, in contrast, is insignificant within a manageable tolerance due to the small relative diameter of the closing needles 24, 25. This has no noticeable effect on the quality of the closing seal.
[000182] Needle opening distances, that is to say, how far the needle moves from the tool cavity in relation to the closing position of the closing needle, in order to allow the material component to flow, depends on factors
Petition 870190133718, of 12/16/2019, p. 78/97
69/74 different. These factors can be, for example, the material characteristics of the material component in the respective material feed channel or the geometry of the nozzle. The offset, therefore, generally cannot be adjusted.
[000183] Closing needles 24 and 25 are preferably made of hardened steel.
[000184] An important advantage of the invention is the fact that its implementation requires only modifications to the tool plate of an existing injection molding tool, specifically on the nozzle side of the tool plate. In this way, in the event that the geometries and the appearance of the cable bodies match, the existing injection molding tools can be converted by adapting the tool plate on the nozzle side, in the technology according to the invention. New product designs with half the effort can be carried out in this way.
[000185] Figures 29a, 29b and 30a to 30c show an additional embodiment of a cable body 1h. The cable body 1h, except for the differences mentioned later in this document, correspond to the design variant of the cable body 1g, according to Figures 20 and 21.
[000186] The cable body 1h also comprises a head part 2h, a neck part 3h, as well as a part of cable 4h. The injection point 10 is also arranged on the cable part 4h.
[000187] The present type of modality differs from the design variant, according to Figures 20 and 21, in that it is carried out without the through opening. A 1h cross-section of the cable body is done instead. The cable body 1h in this narrowing forms a wall region 14 which is laterally surrounded by the arm parts 6h.
Petition 870190133718, of 12/16/2019, p. 79/97
70/74 [000188] The 1h cable body comprises 5h bristle receiving holes to receive the bristles. The 5h bristle receiving holes in the present form, however, are not an essential feature of the invention.
[000189] The manufacture of the cable body 1h is basically carried out in a similar way as the first design variant, according to Figures 1 to 4 or 20 and 21, only here is the case where a wall region is formed in the cross section narrowing of the cable body 1h.
[000190] The first material component 7 with this design forms a protective layer around the second material component 8 that does not allow the second material component 8 to reunite after narrowing in cross section. This also means that the second material component 8 does not advance the first material component towards the head part 2h.
[000191] In a similar way to the modality according to the
In Figures 20 and 21, the two line parts of the second material component 8 in Figures 29a and 29b also do not meet subsequent to the narrowing of the cross section, in the direction of the head part 2h. In contrast, these pass parallel and at a distance from each other in the neck part 3h. In the neck part 3h, the two parts of lines come out in a similar way to the tongue without the second material component 8 leaving the socket through the first material component 7, in each case. Consequently, the head part 2h is completely formed from the first material component 7.
[000192] The present modality is characterized by the particularly aesthetic effect of the parts of lines that pass in parallel. The two parts of lines have a distance of 0.3 mm
Petition 870190133718, of 12/16/2019, p. 80/97 / 74 to 3 mm, preferably from 0.5 mm to 1.5 mm. If they come out in an asymmetrical manner, which means that they are not equally long, then their ends are at most 10 mm apart, preferably at most 5 mm apart from each other in the longitudinal direction of the geometric axis.
[000193] The narrowing of the cross section is symmetrically projected in relation to the direction of material flow in the Figures shown. It is also possible to design the narrowing of the cross-section in an asymmetrical manner. This leads to the distances between the parts of lines, just as the distances between similar ends are capable of being infinitely varied. Of course, it is also possible to drive the second material component 8 to the head part 2h.
[000194] Similar to the modality, according to Figures 13 and 14, the region of the narrowing of the cross section, in the type of modality shown in Figures 29a and 29b, can be peripherally injected (not shown) with the third component of material, for the purpose of forming the thumb rest. The peripheral injection can be, for example, a covering of the arm parts 6h around the cable body 1h in the wall region 14 of the cross-sectional narrowing.
[000195] According to Figures 29a and 29, the second material component 8 which is located within the first material component 7 is shown in a dashed manner. The head part 2h consists exclusively of the first material component 7. The neck part 3h consists at least partially of the first material component 7.
[000196] The cross section through the neck part 3h of Figure 29a along the section line E-E, according to Figure 30a, corresponds to that cross section that is shown in Figure
Petition 870190133718, of 12/16/2019, p. 81/97
72/74
22. For this reason, the description in relation to Figure 22 is referred to in further details.
[000197] The cross section through the cable part 4h along the section line G - G, according to Figure 30c, for example, is designed as shown in Figure 24. A narrowing of the cross section in the cable part 4h it has already been described within the structure of the description in Figure 24. The description in relation to Figure 24, therefore, is referred to in further details.
[000198] Figure 30b shows a cross section through the cable body 1h, according to Figure 29a along the section line FF in the thumb rest region. One can see that the second material component 8i does not penetrate the wall region of the cross-sectional narrowing. In contrast, the second material component 8 flows around the narrowing of the cross-section on the sides, which means through the arm parts 6h. [000199] The shape of the filament parts of the second material component 8 laterally from the narrowing of the cross section through the two arms 6h depends on how the wall region 14 in the cross section narrowing is designed.
[000200] The diameter or distance of the surfaces in the region, where the unification of the layers is between 0.3 mm and 5 mm, preferably between 0.5 mm and 1.5 mm. In this way, the wall thickness is directly related to the method. Larger masses require more cooling time, and smaller masses require less cooling time. Such narrowing directly influences the cycle time depending on how the remaining body is designed. What is decisive is that the wall region 14 after the first cooling cycle has cooled and solidified to such an extent that the second component can no longer penetrate it.
Petition 870190133718, of 12/16/2019, p. 82/97
73/74 [000201] The parts of lines in relation to their dimensions are designed as previously described [000202] The design variants that are shown in this document are certainly exemplary. The form and the individual elements of these design variants can be combined with other design variants within the scope of the invention and without departing from the scope of the invention. The features of the descriptions of the Figures can be combined with each other in addition to the modalities shown individually, in particular, modalities that have the same or similar shape
Numerical Reference List
1a, h handle body of a toothbrush
2a, h head part
3a, h part of neck
4a, h cable part
5a, h bristle receiving holes
6c, h parts of arms first material component
7 'flowable core of the first material component, corresponds to the core body
7 '' shirt body no longer flowable from the first material component, corresponds to the shirt body second material component third component injection point through opening mold separation line thumb rest wall region injection molding tool
Petition 870190133718, of 12/16/2019, p. 83/97
74/74 tool cavity cavity wall hot channel first closing needle second closing needle external material feeding channel internal material feeding channel cylinder-shaped outlet opening through opening of the first closing needle end section of the first closing needle end section of the second closing needle channel wall sealing surface needle closing direction longitudinal geometric axis of the tool cavity material flow direction flow direction flow direction

权利要求:
Claims (18)
[1]
1. Handle body (1a, 1b, 1c, 1d, 1e, 1f, 1g), in particular, of a body care item, such as a toothbrush, comprising a handle part (4a, 4b, 4c, 4d, 4e, 4f, 4g), a neck part (3a, 3b, 3c, 3d, 3e, 3f, 3g) and a head part (2a, 2b, 2c, 2d, 2e, 2f, 2g), wherein the cable body (1a, 1b, 1c, 1d, 1e, 1f, 1g) comprises a first and a second material component (7, 8) of a thermoplastic plastic, wherein the first and the second material components (7, 8) have a common injection point (10) and the cable part (4a, 4b, 4c, 4d, 4e, 4f, 4g) comprises a jacket body of the first material component (7) and a core body of the second material component (8) which is at least partially surrounded by the jacket body, wherein the jacket body at least partly forms the surface of the cable part (4a, 4b, 4c, 4d, 4e, 4f, 4g), characterized by the fact that the injection point (10) is arranged outside a line of mold stop (12) formed by the mold separation, and the cable body (1a, 1b, 1c, 1d, 1e, 1f, 1g) is produced by means of injection molding in an injection molding tool (20) through a hot runner method.
[2]
2 . Cable body according to claim 1, characterized in that the cable body (1d, 1e) comprises a third component of material (9) which is preferably soft elastic and, for example, consists of a thermoplastic elastomer.
[3]
Cable body according to claim 1, characterized by the fact that the second material component (8) preferably towards the head part (2b, 2c, 2d, 2e, 2f) comes out of the casing body of the first material component
Petition 870190133718, of 12/16/2019, p. 85/97
2/8 (7) and appears on the surface, and preferably the head part (2b, 2c, 2d, 2e, 2f) consists completely of the second material component (8).
[4]
4. Cable body according to claim 1, characterized in that the cable body (1a, 1g) preferably, with the exception of the injection point (10) comprises a core body of the second material component ( 8) which is completely surrounded by the shirt body of the first material component (7).
[5]
Cable body according to any one of claims 1 to 4, characterized in that the common injection point (10) of the first and second material components (7, 8) is arranged on the front or back side of the cable body (1a, 1b, 1c, 1d, 1e, 1f, 1g), preferably on the cable part (4a, 4b, 4c, 4d, 4e, 4f, 4g) and preferably on the rear side .
[6]
Cable body according to any one of claims 1 to 5, characterized in that the cable body (1c, 1d, 1e, 1f, 1g) on the cable part (4c, 4d) and / or part neck (3c, 3d, 3e, 3f, 3g) comprises a through opening (11), through which the cable body (1c, 1d, 1e, 1f, 1g) is divided into two arms parts (6c, 6d, 6e, 6f, 6g), and each arm part (6c, 6d, 6e, 6f, 6g) comprises a jacket body of the first material component (7) and a core body of the second material component (8 ) which is surrounded by the shirt body, where the core bodies resemble two lines, at the meeting of the arm parts (6c, 6d, 6e, 6f, 6g) towards the head part (2c, 2d, 2e, 2f, 2g):
The. reunite, and pass additionally towards the head part (2c, 2d, 2e, 2f, 2g) as a core body similar to the common line that is surrounded by the shirt body, or
B. pass in an additionally parallel manner to each other
Petition 870190133718, of 12/16/2019, p. 86/97
3/8 others towards the head part (2c, 2d, 2e, 2f, 2g) as the parts of separate lines that are wrapped by the shirt body, and the line-like core body or bodies preferably come out of the neck (3a, 3b, 3c, 3d, 3e, 3f, 3g) or part of the head (2a, 2b, 2c, 2d, 2e, 2f, 2g) in a manner similar to the tongue.
[7]
Cable body according to any one of claims 1 to 6, characterized in that the first and / or second material component (7, 8) is a rigid component, preferably of a polypropylene (PP) polycyclohexylene dimethylene terephthalate (PCT-A), polyethylene (PE) or a styrene polymer, such as styrene acrylonitrile (SAN).
[8]
Cable body according to any one of claims 1 to 7, characterized in that the first and / or second material component (7, 8) is a soft component, preferably a thermoplastic elastomer.
[9]
9. Method for making an elongated handle body (1a, 1b, 1c, 1d, 1e, 1f, 1g), in particular, of a body care item, such as a toothbrush, hair at least two material components (7, 8) of a thermoplastic plastic, which comprises the injection molding of the material components (7, 8) in an injection molding tool (20) by means of a hot runner method, characterized due to the fact that at least two plastic components (7, 8) are injected through a common injection point which is disposed outside the mold separation line (12) formed by the mold separation in a common tool cavity ( 21) of the injection molding tool (20) using the following steps:
injection mold of a first material component
Petition 870190133718, of 12/16/2019, p. 87/97
4/8 (7) in the tool cavity (21) and a partial filling of the tool cavity (21) with the first material component (7) through a hot channel nozzle;
cooling the first component of injected material (7) in the tool cavity (21), in which at least one flowable web is retained in the first material component (7);
injection mold a second material component (8) into the tool cavity (21) of the injection molding tool (20) through the same hot runner nozzle (23) and preferably complete the tool cavity filling (preferably) 21) with the second material component (8);
wherein the flowable web of the first material component (7) previously injected into the tool cavity (21) is displaced in the direction of material flow (M) during the injection molding of the second material component (8), and the first material component (7) which preferably abuts the cavity wall (33) and is at least partially solidified at least partially surrounds the second inwardly flowing material component (8).
[10]
10. Method according to claim 9, characterized by the fact that the tool cavity (21) is designed as a longitudinal cavity with a longitudinal geometric axis (K), and the injection point (10) is preferably designed, so that the first and second material components are transversely injected with respect to the longitudinal axis (K) of the tool cavity (21), preferably at an angle between 85 ° and 90 ° between the longitudinal axis (K) ) and the needle closing direction (V), inside the tool cavity (21).
[11]
11. Method according to claim 9 or 10, characterized by the fact that the ratio of the injected volume of the first
Petition 870190133718, of 12/16/2019, p. 88/97
5/8 material component (7) and the total volume of the tool cavity (21) and the flowable web ratio (7 ') of the first material component (7) and the unfilled volume of the tool cavity (21) is selected so that the second subsequently injected material component (8) comes out of the first material component (7) that surrounds it, in the direction of material flow (M) and, thus, an end section of the tool cavity (21) which is in the front in the direction of material flow (M) is completely and exclusively filled with the second material component (8).
[12]
12. Method according to claim 9 or 10, characterized in that the ratio of the injected volume of the first material component (7) and the total volume of the tool cavity (21) and the flowable web ratio (7 ') of the first material component (7) and the unfilled volume of the tool cavity (21) is selected so that the second material component (8) displaces the flowable web (7') of the first material component (7 ) in the material flow direction (M), where the displaced web (7 ') in the material flow direction (M) fills a front end section of the tool cavity (21), so that the second component of material (8) is completely surrounded by the first material component (7), preferably, except at the injection point (10).
[13]
13. Method according to any of claims 9 to 12, characterized by the fact that
The. the total volume of the tool cavity (21) minus the total volume of the first component of injected material (7) is less than the flowable web (7 ') displaced by the second material component (8), or
B. the total volume of the tool cavity (21) minus the
Petition 870190133718, of 12/16/2019, p. 89/97
6/8 total volume of the first component of injected material (7) is greater than or equal to the flowable web (7 ') displaced by the second material component (8).
[14]
Method according to any one of claims 9 to 13, characterized in that the tool cavity (21) in the direction of material flow (M) is temporarily divided into at least two parts of channels (6f, 6g ) that reunite, and when injecting the second material component (8), the flowable web (7 ') of the first material component (7) is displaced in the direction of material flow (M) in an anterior end section the tool cavity (21) and the second material component (8) between the formation of two parts of lines follows the displaced web (7 ') through the channel parts (6f, 6g), where
The. the two parts of lines subsequent to the unification of the two parts of channels (6f, 6g) come together, and pass in addition as a common core body similar to the line surrounded by the shirt body, towards the head part (2c, 2d, 2e, 2f, 2g), or
B. the two parts of lines subsequent to the unification of the two parts of channels (6f, 6g) pass separately and parallel to each other between the formation of two end sections that come out in a manner similar to the tongue.
[15]
Method according to any one of claims 9 to 14, characterized in that the first material component (7) is again injected subsequent to the injection of the second material component (8), so that the surface at the point injection mold (10) is formed from the first material component (7).
[16]
16. Method, according to any of the
Petition 870190133718, of 12/16/2019, p. 90/97
7/8 claims 9 to 15, wherein the injection molding tool (20) is a hot groove tool comprising a hot groove nozzle (23) which exits into a tool cavity (21) and which is designed as a needle locking nozzle, wherein the hot channel nozzle (23) comprises a first locking needle designed as a hollow needle (24), as well as a second locking needle (25) that can be inserted into the hollow needle (24), and the first closing needle (24) in the hot channel nozzle (23) with an outwardly channel channel (33) forms an external material feed channel (26) and with its through opening axial (29) forms an internal material feed channel (27).
[17]
17. Method according to claim 16, characterized in that the hot channel nozzle (23) comprises a cylinder-shaped outlet opening (28), and the first closing needle (24) comprises a section of cylinder-shaped end (30) that is projected, so that it can be inserted into the cylinder-shaped outlet opening (28) with a positive fit for, thus, between the formation of a cylindrical sealing surface that passes parallel to the closing direction (V), seal the external material feed channel (26) in the tool cavity (21).
[18]
18. Method according to claim 17, characterized in that the second closing needle (25) comprises a cylinder-shaped end section (31), and the through opening (29) of the first closing needle (25). 24) in its end section (30) is cylinder-shaped, so that the second closing needle (25) can be inserted into the through opening (29) in the cylinder-shaped end section (30) of the first needle closing (24) with an adjustment
Petition 870190133718, of 12/16/2019, p. 91/97
8/8 positive so that, between the formation of a cylindrical sealing surface that runs parallel to the closing direction (V), seal the internal material feed channel (27) in a tool cavity (21).

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法律状态:
2018-03-27| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2019-09-17| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

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2020-02-18| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2020-04-14| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 25/07/2012, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

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申请号 | 申请日 | 专利标题

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EP11405297.0A|EP2554353B1|2011-08-05|2011-08-05|Tooth brush and method for the manufacture of a tooth brush|

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PCT/CH2012/000175|WO2013020237A1|2011-08-05|2012-07-25|Method for producing a toothbrush, and toothbrush|

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