• 专利附录
  • 专利说明
  • 权利要求
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  • 法律状态
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    • 专利摘要:
    The present invention relates to improvements and improvement of the Spanish patent n ° 201531310 on "Mold for the injection of thermoplastics and method of using said mold", based on the introduction of a system of pressure control of the injection system to correct the problems associated with the variability of conditions of the material, mold and parts to be injected and to minimize the times and unproductive series used in calibrating the process for each new mold used, which can be of different shapes and configurations. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2663874A1
    申请号:ES201631192
    申请日:2016-09-14
    公开日:2018-04-17
    发明作者:Luis Manuel ALEMANY NEGRETE；Ferran NAVARRO I TEIXIDÓ
    申请人:Comercial Nicem Exinte SA；Com Nicem Exinte S A；
    IPC主号:
    专利说明:

    IMPROVEMENTS IN THERMOPLASTICS INJECTION PROCEDURE WITH CONTROL SYSTEM AND MOLD USED IN THIS PROCESS
    - DESCRIPTIVE MEMORY -
    5 Object of the Invention.
    The present invention, like the main patent No. 201531310, is based on a thermoplastic injection process in flexible mold and in the mold used in said process, for the production of plastic parts by means of said injection on flexible mold.
    10 State of the Art.
    As indicated in the main patent No. 201531310, there are various injection processes of plastic materials on rigid molds, usually metal, which are known in the state of the art and that said patent justified its drawbacks in front of the invention. raised.
    In Invention Patent No. 201531310, a mold for the injection of thermoplastics and a method of using said mold is described and claimed, said invention having the limitation in its process of an operation to be calibrated and tested each time they change. the 20 conditions of the thermoplastic, which changes the type of mold, or which the parts change and their arrangement in the mold.
    This lack of repeatability of the correct results of the injection process, causes an expense of material and an excess of unproductive time in the exercise of the calibration by the trial and error method, 25 which determines the efficiency of the process and the productivity of the installation that develops it
    Description of the Invention
    The purpose of the present invention is to improve the process of injection of thermoplastic material in flexible molds shown in Spanish Patent No. 201531310, providing a control system that
    allow to carry out said process in a repeatable way with results that do not give failures in the process by having variations in the conditions of the product, the type of mold or the pieces to be made.
    It is also an object of the present invention to increase the 5 possibilities of configuration of the mold used in said process, with respect to the relative location of the areas of the parts to be injected, as well as their channels and other constituent elements.
    Thus, the present invention, which is added to Patent No. 201531310, is based on the same thermoplastic injection process 10 in a flexible mold, a control system introducing said process, which has the following steps:
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    a) Introduction of the thermoplastic material in supply means where they will be in the temperature conditions necessary for its injection, taking into account the characteristics of the material.
    b) Bring and maintain the thermoplastic material at the temperature necessary for its desired fluidity, and thus be able to inject in the ideal conditions.
    c) Locate the flexible mold between the closing means that are coupled with the injection means, closing the mold at the desired pressure. This supply of the mold, which can be done automatically or manually, introduces the identification of the mold, so that the process control system can know the characteristics of the mold and the parts to be made in it.
    d) Extraction of internal air from the mold by a vacuum system, beforehand and even during the injection stage itself.
    e) Injection of the thermoplastic material into the mold under optimal conditions by means of injection means.
    f) Opening of the closing means, extraction of the mold and cooling, if necessary, of the same, by usual means such as water, forced ventilation, refrigerated plates, etc.
    g) Opening of the mold and demoulding of the pieces.
    Said process advantageously incorporates the use of a control system that, at least, controls the injection pressure of the thermoplastic in the mold, preventing overpressures in the mold that cause the thermoplastic to leave the interior of said mold and create 5 Invalid parts and, therefore, loss of material and production times. The injection pressure will be regulated from 0 bar onwards, controlling the injection rates that can be up to 50 g / sec, with injection times not limited to anything other than maintaining the physical conditions of thermoplastic injection.
    10 When controlling the pressure of the injection system, even if there are variations in the state parameters of the thermoplastic material, and therefore of its physical characteristics, it will be controlled not to exceed the stipulated pressures, whether they are closing the mold closing means and / or the resistance of said flexible mold, stopping the injection of thermoplastic material onto the mold.
    As indicated, another innovative part of the process is to identify the molds, by physical or electronic means, so that the control system can regulate the injection pressure to the parts and the characteristics of the mold.
    The control system can preferably also include the control of the heating means of the thermoplastic material, the performance of the vacuum system, the speed or flow of material, temperature of the mold, as well as the means of closing the mold and the minimum solidification times until the opening of said closing means. The regulation of the injection pressure, the temperature at which the thermoplastic material is heated, the operation of the vacuum system and the closing pressure of the flexible mold, can be carried out manually or automatically with simple identification of the mold that is introduced.
    Said introduction of the mold has indicated that it can be manual, or automatic, by means of an automated carousel system that brings the molds chosen in the chosen position to the injection position, from the storage place of said molds.
    The mold used in the previous thermoplastic injection process, starts from the same condition as patent No. 201531310, being flexible, and preferably made by vulcanized silicones, although other types of elastomers that allow hot or high temperature vulcanization, 5 can also be used, which allows its speed and low processing cost, as indicated in said original patent.
    The molds that break with the circular geometries are incorporated in the present invention, being able to be of different shapes, according to production needs, not needing to perform an exclusive filling 10 of the radial mold.
    The mold, which like the previous one, consists of two parts, it is not necessary to be symmetrical, since it can have channels, openings and cavities of pieces, distributed differently in each of its parts, either in its major faces or on its sides.
    15 The mold has at least one opening for the tight coupling of the injection system, as well as at least one other vacuum opening, which can be in one part of the mold or in both according to design. The injection, although preferably superior to the mold perpendicularly to it, can also be performed laterally or inferiorly, 20 according to possible configuration of the openings of the flexible mold.
    The channels responsible for carrying the thermoplastic material to the cavities where the pieces will be formed may have sections of varied shapes depending on the particularities of the design, usually the circular ones, although other shapes are possible, such as, for example, trapezoidal, elliptical, rectangular , etc.
    These channels are designed for the correct filling of the cavities that form the pieces, without the need to maintain a proportionality with the cavities, since it will be a correct previous design of the mold together with the control system which allows to carry out a process of 30 efficient injection.
    In addition to the distribution channels, those known by the previous patent, minimum section vacuum channels for the single passage of air and not the injected material that communicate with the vacuum system will be available.
    The flexible mold material is a hot vulcanized elastomer, preferably a vulcanized silicone, of various compositions and various vulcanizing methods that achieve the different flexibilities that will be used in the process.
    The materials used to inject on said flexible mold are of the thermoplastic type, being able to be of a great variety of classes while at a given temperature it has optimal conditions to perform the injection process, such as melting temperatures between 180 and 250 ° C and fluidity between 800 and 50,000 cps.
    Such materials may include fillers such as calcium carbonate or glass microspheres to make the final piece harder, or additives such as plasticizers.
    Thus, with the present invention the process shown in the patent No. 201531310 is improved, achieving greater efficiency in the process, as well as having some molds to be used, with wider configurations that allow its use in different applications of the 20 process
    Other details and features will be revealed in the course of the description given below, in which it is shown by way of illustration but not limitation different examples of the invention, with the help of the corresponding figures.
    25 Description of the Figures.
    Figure 1 is an improved process operation scheme.
    Description of a preferred embodiment of the invention.
    In the present embodiment of the invention, and as can be seen in Figure 1, there is a carousel system (12) of molds (11) which is
    load with different flexible molds (11) so that the process is continuously fed with molds (11).
    Each time a mold (11) is incorporated into the injection process (10), it is identified by means of code recognition (14) so that the process control system (13) knows what characteristics the mold has, its flexibility and the piece you are going to make (piece geometry, volume, etc.).
    Once it is determined which mold (11) to load, said flexible mold (11) is introduced into the closing means (15), usually formed 10 by two platforms with relative movement between them in order to be able to close the pressure against one another. at the pressure determined by the control system (13). This pressure can be carried out by the usual systems of pressure or displacement of the platforms.
    In one of the platforms, the coupling opening 15 is arranged tightly with the injection system, as well as the opening of
    tight coupling of the vacuum system, corresponding to the arrangement of openings in the parts of the flexible mold (11). In other embodiments, this distribution of openings can be made on different platforms and parts of the closing system and flexible mold.
    20 The injection system (16) of thermoplastic material, which is
    supplied of said material by means consisting of a reservoir (17) with resistances that keep the thermoplastic material in the ideal injection conditions, in the present embodiment a pump with a variator and timer will be used, in addition to a control system pressure (18) formed by a material recirculation
    thermoplastic that acts actively, piloted, regulated by the control system, when the mold is filled and the pressure of the thermoplastic material begins to rise. Other systems are possible in alternative embodiments such as the pressure control exerted by an injection piston 30 (acceleration and stroke of its piston), or by the use of pressure sensors, or pressure switches, that knowing the pressure value of the
    Thermoplastic material act by stopping the pump motor, among other possibilities.
    The vacuum system (19), actuated by the control system (13), will carry out the extraction of the air inside the mold (11) beforehand and 5 during the injection, creating a pressure of up to 5 mbar absolute.
    Once the control system (13) confirms that the pressure of the injected thermoplastic material is higher than that set as a limit, the injection of material into the mold is stopped, giving way to its cooling and opening of the mold, for the subsequent demoulding of The pieces.
    10 The process (10), being powered by an automated carousel
    (12), will introduce the new mold (11) into the closing system (15), once said mold (11) has been identified by the recognition system (14), so that the control system (13) can determine the pressure of closing of the mold (11), injection pressure values and end of it, the beginning and end of the operation of the vacuum system (19), as well as checking the suitable conditions of the thermoplastic material that is available in the media supply (17) to the injection system (16).
    The flexible mold (11), made of vulcanized silicone obtaining hardnesses of between 30 and 90 Shore A, with a shape in the present embodiment 20 of a square plan, has a filling opening (21), on the one hand and with opening (22 ) for coupling the vacuum system (19) in the same part. This mold (11) will have a graphic code for its identification by the control system (13), although in alternative embodiments it may be by means of an RFID chip or other identification systems.
    The mold (11) has a distribution of filling channels (23) of thermoplastic material to the cavities (24) that form the pieces, which is not radial. There are also vacuum channels (25) that have a minimum section that practically does not allow the passage of material, but 30 that only lets the air extracted through the vacuum system (19), connecting to a channel that communicates them and which is the one that communicates with the vacuum system (19).
    Described sufficiently the present invention in correspondence with the attached Figures, it is easy to understand that any modifications of detail that they deem convenient may be introduced therein, provided they do not alter the essence of the invention which is summarized in the following claims.
    权利要求:
    Claims (1)
    [1]
    R E I V I N D I C A C I O N E S:
    1a - IMPROVEMENTS IN THE THERMOPLASTIC INJECTION PROCEDURE WITH CONTROL SYSTEM, of those used 5 for the manufacture of plastic parts and which has the stages of:
    - Introduction of thermoplastic material in supply means;
    - bring and maintain the thermoplastic material at the necessary temperature;
    10 - locate the flexible mold between the closing means
    couple with the injection means, closing the mold at the desired pressure;
    - extraction of internal air from the mold by a vacuum system, prior to and even during the injection stage itself;
    15 - injection of the thermoplastic material into the mold in the
    optimal conditions by means of injection means;
    - opening of the closing means, extraction of the mold and cooling, if necessary, thereof;
    - opening of the mold and unmolding of the pieces;
    20 characterized in that the process has a control system that, at least, controls the injection pressure of the thermoplastic in the flexible mold, stopping the injection on said mold, when the stipulated pressures are exceeded, whether closing the means of closing the mold and / or the resistance of said flexible mold.
    25 2a - IMPROVEMENTS IN THE INJECTION PROCEDURE OF
    THERMOPLASTICS WITH CONTROL SYSTEM, according to the 1st claim, characterized in that the control system includes the control of the heating means of the thermoplastic material, the performance of the vacuum system, the speed or flow of material,
    30 mold temperature, as well as the mold closing means and the minimum solidification times until the opening of said means of
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    closure, allowing manual or automatic regulation of the injection pressure, material inlet velocity, the temperature at which the thermoplastic material is heated and the mold is located, the performance of the vacuum system and the pressure of closing of the flexible mold, as well as of the time that will remain closed for its solidification.
    3a - IMPROVEMENTS IN THE THERMOPLASTIC INJECTION PROCEDURE WITH CONTROL SYSTEM, according to claim 1, characterized in that the process incorporates a mold identification phase so that the control system knows the characteristics of the mold.
    4a - IMPROVEMENTS IN THE THERMOPLASTIC INJECTION PROCEDURE WITH CONTROL SYSTEM, according to the claim, characterized in that the process incorporates the automatic introduction of molds by means of an automated carousel system that brings the molds chosen in the injection position to the injection position. order chosen.
    5a - MOLD FOR IMPROVED THERMOPLASTIC INJECTION PROCESSES of those used in procedures such as those described in the claims from ia to 3a, and are formed by flexible vulcanized elastomers, such as silicones, with material inlet openings, material channels vacuum and distribution channels of said material to the cavities that will form the piece, and in which the mold having a geometric shape of circular or different circular plan, is characterized in that it incorporates a code or means to be identified by the control system .
    6a - MOLD FOR IMPROVED THERMOPLASTIC INJECTION PROCESSES according to the 5th claim, characterized in that the connection openings for filling and for performing the vacuum are in the same part of the two of which the mold consists.
    7a - MOLD FOR IMPROVED THERMOPLASTIC INJECTION PROCESSES according to the 5th claim, characterized in that the two parts of the mold are asymmetrical.
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    ES2663874B1|2019-01-14|
    引用文献:
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    申请号 | 申请日 | 专利标题
    ES201631192A|ES2663874B1|2016-09-14|2016-09-14|IMPROVEMENTS IN THE PROCEDURE OF INJECTION OF THERMOPLASTICS WITH CONTROL SYSTEM AND MOLD USED IN SUCH PROCESS|ES201631192A| ES2663874B1|2016-09-14|2016-09-14|IMPROVEMENTS IN THE PROCEDURE OF INJECTION OF THERMOPLASTICS WITH CONTROL SYSTEM AND MOLD USED IN SUCH PROCESS|
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