• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Machine for manufacturing heat-sealed composite trays, comprising: conveying means for conveying hollow cardboard containers (1) one by one to a thermoforming station (35); preheating means (32) for preheating at least one a plasticized cardboard container face (2) before thermoforming, - a thermoforming station (35), with means for feeding into a thermoforming mold a container (2) from the conveying means, with means (39) for feeding a plastic film (3) facing the opening of the thermoforming mold, radiation means (36) for heating the film (3), and means for selectively pressing the film (3) into the hollow of the plasticized cardboard container (2) preheated while the preheated container (2) is still hot.
    公开号:FR3040654A1
    申请号:FR1558282
    申请日:2015-09-07
    公开日:2017-03-10
    发明作者:Jean-Luc Rival
    申请人:CGL Pack Service SAS；
    IPC主号:
    专利说明:

    The present invention relates to the production of heat-sealed composite trays for containing articles such as foods.
    According to a first known type, the trays for containing food comprise a hollow container delimiting at least one cavity between a container bottom wall and a container lateral peripheral wall, with a main opening face defining an opening plane of the container. the cavity upwards, and with an upper peripheral sidewalk extending radially outwardly from the top of the container side peripheral wall.
    These known trays are generally made of relatively thick walled plastics, i.e. relatively thick container bottom wall and lateral peripheral wall formed from a shaped plastics sheet, for example by molding and stretching. The relatively large thickness of the plastic sheet intended to form the container walls after forming, generally of the order of 0.4 to 0.8 mm before shaping, usually 0.6 mm approximately before shaping, is necessary to ensure sufficient rigidity of the container so that it can be easily handled and that it is not excessively deformed by the food it contains.
    A major disadvantage of these known trays is then the large amount of plastic that constitutes the containers, material that consumes for its production a non-renewable energy, and which becomes after use a waste more or less difficult to recycle.
    According to a second known type, described for example in documents FR 2 826 938 and FR 2 933 329, trays for containing food include a hollow container generally made of plastic, and an outer structure of cardboard reinforcement. These two elements constituting the tray for containing the food are made integral by use of glue, that is to say by means of additional securing added, chemical nature. These composite trays have the advantage of using a smaller amount of plastic, because the cardboard reinforcing structure improves the overall mechanical strength of the tray by compensating for the lack of rigidity of the container. Thus, the wall of the hollow container may be thinner.
    However, this second type of tray has a first disadvantage which is to require the addition of an additional element reported, namely the glue, present in large amounts to ensure sufficient adhesion between two components of different materials and relatively thick l one and the other. In addition, an additional amount of glue is still necessary to ensure the setting and maintenance of the cardboard reinforcement structure before assembly, by gluing assembly tongues.
    In addition, selective recycling of such composite trays can not be easily implemented because it is difficult to separate the hollow container from the external reinforcing structure and to avoid simultaneously that the glue remains attached to one or the other. other constituent element.
    In order to reduce the amount of adhesive without compromising the strength of the connection between the hollow plastic container and the external cardboard reinforcement structure, the document FR 2 826 938 proposed to provide, in the upper peripheral sidewalk of the outer structure of reinforcement, a peripheral groove in which engages the plastic film forming the container. However, the throat complicates the production and implementation of such a tray, and affects the holding of a lid later welded to the peripheral sidewalk. And it remains necessary to use the glue for putting and maintaining the shape of the outer reinforcement structure before assembly.
    The document FR 2 975 973 describes a composite cardboard tray sealed by a plastic film thermoformed according to its inner face and whose contact surface of the film is self-adhesive or heat-sealing. However, either the film is complex to have a sufficiently tacky surface, or the adhesion of the film is insufficient. And it remains necessary to use glue for setting and maintaining the shape of the outer reinforcement structure before assembly.
    WO 2009/138786 A2 proposes a method for producing a sealed composite tray in which a plastic film is heated and then deformed and pressed to adhere to the inner surface of a cardboard tray. It is recommended one or more additional steps of heating and pressing the film against the cardboard tray to ensure sufficient bonding of the film to the cardboard tray. However, these additional steps are necessary, increase the cost of production, and still do not provide reliable adhesion, especially when the plastic film is polyethylene. And it remains necessary to use glue for setting and maintaining the shape of the outer reinforcement structure before assembly.
    Difficulties of adhesion are less frequent when the plastic film is made of polypropylene, because this material adheres easily to the cardboard. However, a first disadvantage is that the polypropylene film deforms the cardboard during cooling after thermoforming, which gives the tray an unacceptable aesthetic appearance.
    A second disadvantage is a difficulty of subsequently separating the carton, some parts of which remain stuck to the film during recycling.
    The difficulties to achieve a reversible adhesion are very important when the plastic film is polyethylene or polyethylene terephthalate, which is particularly regrettable because these materials are less expensive and well suited to industrialization in the food field.
    The difficulties to achieve a reversible adhesion are even greater when the film is thin, while it is a priori desirable to reduce the amount of plastic.
    A problem proposed by the present invention is to design means for producing composite trays based on cardboard and plastic film in which the adhesion of the plastic film to the carton is reliably ensured without the use of a large layer of adhesive, and in which the adhesion of the plastic film to the board is reversible so that the separation of the plastic film and the board can be easily ensured during a subsequent recycling operation after use, avoiding any adhesion of the board to the plastic film .
    A second problem proposed by the present invention is to design such means for ensuring the reliable and reversible adhesion of a plastic film to the carton of the tray when the film is polyethylene or polyethylene terephthalate.
    A third problem proposed by the present invention is to design such means to ensure the reliable and reversible adhesion of the plastic film of polyethylene or polyethylene terephthalate on the carton of the tray even in the case where the plastic film is low thickness. The aim of the invention is, where appropriate, to eliminate the need for glue and assembly tongues for putting and maintaining the shape of the cardboard structure.
    To achieve these and other objects, the invention provides a method of manufacturing a tray for containing food, comprising the following steps: A) providing a hollow container made of cardboard with a plasticized face, delimiting at least one cavity between a container bottom wall and a container side peripheral wall, with a main opening in a cavity opening plane upwards, the plasticized face of the carton being oriented towards the inside of the container, B) preheating the plasticized face of the board to a preheating temperature T1, C) providing a plastic film with respect to the main opening of the cardboard container, D) heating said film to a temperature permitting its plastic deformation, E) deforming said film during or after heating to pressurize against the plasticized side of the cardboard container still hot.
    While the techniques heretofore known consisted in heating the plastic material constituting the film one or more times in an attempt to ensure sufficient adhesion of the film to a cardboard reinforcement structure, hoping logically to cause better softening and better penetration of the plastic in surface irregularities of the board, but in reality did not provide satisfactory results, the present invention takes the opposite and proposes to use a board with plasticized surface and to preheat the cardboard itself . Surprisingly, it has been found that this very appreciably improves the adhesion of the plastic film to the board, and makes this adhesion particularly reliable and reversible. It is then no longer necessary or useful to carry out multiple subsequent heating of the assembled structure of film and cardboard.
    It seems that the preheating of the cardboard makes it possible to constitute, in the mass of the cardboard, a reserve of calories which maintains for a sufficient time the plastic film at a temperature suitable for its adhesion. Simultaneously, the presence of the plastic layer on the plasticized side of the carton facilitates the welding with the film, said plastic layer being itself brought to the appropriate temperature for adhesion of the film.
    To constitute a sufficient reserve of calories, it is advantageous to carry out a preheating such that, after step B), the plasticized face of the cardboard container is at a preheating temperature T1 of about 100 ° C. .
    In this way, despite the inevitable drop in temperature of the plasticized face of the paperboard container after step B), this temperature may remain sufficient to ensure proper adhesion during the subsequent deformation and plating of the film against the box.
    In practice, by avoiding transfer times that are too long, it is ensured that, at the beginning of step E), the plasticized face of the paperboard container is still at a temperature of adhesion T2 greater than 50.degree. C., advantageously between 60 ° C and 80 ° C.
    In this way, the temperature is sufficient to ensure proper adhesion during the step of deformation and plating of the film against the board.
    In practice, it can be advantageously provided that, before step E), the cardboard container is engaged in a thermoforming mold, and, during step E), the penetration of the film into said at least one cavity is assisted. of the cardboard container using pushing means.
    The thrust means may comprise pressurized gas injection means on the outer face of the film, and / or gas suction means in the interface between the thermoforming mold and the cardboard container.
    Preferably, the thrust means produce an air overpressure of 400,000 to 600,000 Pa on the outer face of the film, and an air depression of 50,000 to 80,000 Pa in the interface between the paperboard container and the plastic film.
    According to an advantageous embodiment, step A) comprises the following sequences: A1) providing a cut, grooved, and plastic-coated cardboard plate, A2) before or after step B) of preheating the plasticized face of the carton preforming the cardboard plate by folding to constitute said hollow cardboard container defining at least one cavity between a container bottom wall and a container side peripheral wall, with a main opening in a plane of opening of the cavity towards the top, the plasticized side of the carton being oriented towards the inside of the container. The stacking of flat cardboard plates, for their storage and unstacking during the implementation of the method according to the invention, is simpler than a stacking or unstacking of hollow shapes. This makes it possible to make the process of making trays more reliable and faster.
    Preferably, during steps A) to D) of the process, additional means such as collages are not used to ensure that the cardboard container is set and held in shape. This maintenance is ensured by the only plastic film after step E).
    According to the invention, the plasticized face of the cardboard may be polyethylene mono (PE) or polyethylene terephthalate (PET).
    Cartons plasticized in this way are readily available commercially, and are particularly suitable for carrying out the process according to the present invention.
    Preferably, the thickness of the plastic layer forming the plasticized side of the carton is less than 30 microns.
    In this way, after use of the tray, the plasticized cardboard structure is in itself considered as cardboard, for recycling, because the amount of plastic material is negligible compared to the amount of cardboard.
    According to the invention, the film may be a multilayer film with a polyethylene (PE) layer, or a polyethylene terephthalate (PET) film.
    Indeed, thanks to the process of preheating and the use of a plasticized cardboard, the adhesion of the film on the cardboard is ensured even in the difficult case of a film in polyethylene or polyethylene terephthalate, plastics which naturally present a low adhesion capacity on the cardboard.
    It can advantageously be provided that the plasticized face of the carton is of the same material as the film.
    Indeed, it facilitates adhesion and welding, and this reduces the number of different plastics that must then be recycled after use of the tray.
    According to another aspect, the present invention provides a machine for manufacturing a tray implementing a manufacturing method as defined above.
    In practice, such a machine may comprise: conveying means for bringing hollow cardboard containers one by one to a thermoforming station, preheating means for preheating at least one container face before thermoforming, in a preheating station, - a thermoforming station, with means for feeding into a thermoforming mold a container from the conveying means, with means for feeding a plastic film facing the opening of the thermoforming mold, means for heating the plastic film, and means for selectively pressing the plastic film into the hollow of the preheated paperboard container while the preheated container is still warm.
    Preferably, this machine may further comprise: - means for storing a stack of pre-cut and grooved cardboard plates according to desired fold lines, - preforming means for preforming the cardboard plates and thus constituting the hollow containers cardboard-based.
    To ensure the correct implementation of the method according to the invention, the preheating means are able to preheat a face of the board to a preheating temperature T1 of about 100 ° C.
    The present invention makes it possible to use, as a plastic film, a film of a standard, non-complex plastic material which has no particular adhesion properties on the board. Such a plastic film is less expensive, and the process is easily industrializable. Other objects, features and advantages of the present invention will become apparent from the following description of particular embodiments, with reference to the attached figures, in which: FIG. 1 is a general perspective view of a tray according to a embodiment of the invention; - Figure 2 is a top view of the tray of Figure 1; - Figure 3 is a front view of the tray of Figure 1; - Figure 4 is a side view of the tray of Figure 1; - Figure 5 is a top view of a cardboard plate for forming the hollow cardboard container ensuring the strengthening of the tray of Figure 1; FIG. 6 is a perspective view of the hollow cardboard container, after forming; - Figure 7 is a schematic front view of a tray manufacturing machine according to one embodiment of the invention; and FIG. 8 is a schematic view from above of the machine of FIG. 7, according to an advantageous variant.
    Figures 1 to 4, which illustrate a tray structure 1 according to one embodiment of the present invention, are first considered.
    This tray 1 consists of the assembly of a cardboard container 2 and a plastic film 3. The cardboard container 2, illustrated in isolation in FIG. 6, delimits at least one cavity 4 between a bottom wall container 5 and a container peripheral side wall 6, with a main opening 7 according to an opening plane P of the cavity 4 upwards.
    In the illustrated embodiment, the cardboard container 2 has a generally parallelepipedal shape, the bottom wall 5 forming a large rectangular face, the peripheral wall 6 being composed of four rectangular segments, the assembly surrounding a single cavity 4. However, it will be understood that it is possible, without departing from the scope of the present invention, to design hollow cardboard containers having different shapes, for example a cylindrical shape with a circular or oval contour, a shape with a polygonal contour, a shape with intermediate partition walls defining a plurality of adjacent cavities.
    As can be seen more clearly in FIGS. 3 and 4, the container lateral peripheral wall 6 is inclined outwards, having a non-zero draft angle θ, for example of 5 to 10 °.
    As seen more particularly in FIG. 6, stacking abutments 7a, 7b, 7c, 7d are formed by appropriate cuts between the bottom wall 5 and the lateral peripheral wall 6 of the cardboard container 2. These abutments Stacking cutouts are useful to avoid the complete embedding of trays stacked into each other. They may also be useful during the manufacturing process of the tray, as will be explained later.
    In the tray 1 as illustrated in Figures 1 to 4, the cardboard container constitutes an outer structure conferring on the tray 1 its mechanical strength. The inner face of the cavity 4 of the cardboard container 2 is covered by the plastic film 3, which ensures the seal and integrity.
    The upper edge 6a of the container side peripheral wall 6, in this embodiment, is in the opening plane P. The plastic film 3 also forms an upper peripheral sidewalk 8 which extends radially towards the outside in the plane of opening P from the upper edge 6a of the cardboard container 2.
    As can be seen from FIGS. 5 and 6, the paperboard container 2 is formed from a cut and slotted cardboard plate 9. More specifically, in the embodiment illustrated in FIG. 5, the cardboard plate 9 is flat, with a rectangular contour, with notches 11, 12, 13 and 14 at each corner, the edges of each notch such as the edges 11a and 11b of the notch 11 forming an acute angle K.
    Fold lines 15, 16, 17 and 18 rectilinear connect the vertices of the consecutive notches 11, 12, 13 and 14. Each fold line 15-18 is made either by crushing the cardboard or by intermittent cutting lines, to constitute a folding starter. Thus, the fold lines 15-18 and the notches 11-14 define folding flaps 19, 20, 21 and 22 attached by the fold lines 15-18 to a rectangular central portion 23.
    By folding along the folding lines 15-18, the folding flaps 19-22 are intended to form the peripheral wall 6 of the cardboard container 2 of Figure 6, while the rectangular central portion 23 is intended to form the bottom wall. 5 of the cardboard container 2.
    As illustrated in FIG. 5, transverse section lines 70a and 71a, overlapping a fold line 16, make it possible, after folding, to produce the stacking abutment 7a shown in FIG. 6. The abutment is likewise produced. stacking 7b, 7c and 7d.
    To avoid embedding, the stacking stops of a tray are offset laterally relative to the stacking stops of adjacent trays in a stack of trays. Non-identical trays are stacked for this purpose, or adjacent trays with stacking stops having non-symmetrical positions are pivoted.
    In the preferred embodiment illustrated in Figures 1 to 6, the peripheral sidewalk 8 is made by the single plastic film 3. The advantage is that the plastic film 3 can be shaped flat, without risk of later deformation, allowing the subsequent reliable sealing of a lid closing the upper opening of the tray 1.
    However, without departing from the scope of the present invention, it is possible to design a peripheral sidewalk 8 constituted by the assembly of folding flaps of the cardboard container 2 and an upper layer formed by the plastic film 3. In this case, the cardboard plate 9 illustrated in FIG. 5 must also comprise external secondary flaps, attached to the flaps 19-22, to constitute the peripheral sidewalk 8. A disadvantage of this embodiment may be that the carton may distort the peripheral sidewalk 8, degrading its flatness and may reduce the reliability of sealing a lid.
    In order to have an easily recyclable product, the cardboard container 2, and therefore the cardboard plate 9 which makes it possible to produce it, consists essentially of cardboard (for example recycled). Excellent results have been obtained using a board having a basis weight of between about 170 g per square meter and 300 g per square meter.
    The cardboard plate 9 further comprises a plasticized main face, for example the upper face illustrated in FIG. 5. The plasticized main face may be made by hot-coating a plastic material, or preferably by bonding a film. thin of the plastic material. The plastic layer constituting the plasticized face has a small thickness, less than 30 microns, advantageously between 10 and 20 microns. In this way, the cardboard plate 9, consisting essentially of cardboard with only a very small amount of plastic forming the plasticized side, is itself considered as cardboard with regard to the standards applicable to the subsequent recycling of materials. The amount of glue used, if any, for gluing the thin film of plastic material is extremely small, totally negligible with regard to subsequent recycling.
    The plastic material constituting the plasticized face of the cardboard plate 9 is advantageously polyethylene, or polyethylene terephthalate.
    The plastic film 3, forming the inside of the tray 1, is advantageously a multilayer film with a polyethylene layer, or a polyethylene terephthalate film. Excellent results have been obtained starting from an amorphous polyethylene terephthalate sheet having an initial thickness of 0.2 millimeters. Polyethylene, or rPET (recycled polyethylene), can also be used to further reduce the environmental impact of the tray.
    In the tray 1 thus assembled, the plastic film 3 is secured to the cardboard container 2 along its entire contact surface. In reality, the plastic film 3 adheres by welding to the plastic layer constituting the inner plasticized face of the cardboard container 2, and this adhesion is reliable to ensure the integrity of the tray 1 during all its normal use, and to maintain the shape of the cardboard container 2. It is thus unnecessary to use additional means to keep the cardboard container 2 in shape.
    However, to allow correct subsequent recycling, the plastic film 3 remains separable from the cardboard container 2, by voluntary mechanical tearing. Experience shows that, according to the invention, tearing is possible without causing the adhesion of cardboard parts of the cardboard container 2 to the plastic material constituting the plastic film 3.
    These advantageous technical effects of the tray 1 according to the invention are obtained thanks to the manufacturing method which will now be described in relation to FIGS. 7 and 8.
    During a step A), a paperboard container 2 is taken or made with a plasticized inner face, as illustrated in FIG. 6. This step may be carried out simply by taking the preformed container from a container pool. Preferably, this step can be carried out as illustrated in FIG. 7, in a sequence A1 for taking a pre-cut and grooved cardboard plate 9 as illustrated in FIG. 5, from a supply of cardboard plates. 30, as illustrated in FIG. 7, in which plastic-coated cardboard plates 9 are stacked. During a sequence A2, the collected cardboard plate 9 is then preformed by folding in a preforming station 31 to constitute the cardboard container 2.
    During a step B), in a preheating station 32 placed upstream of the preforming station 31, the cardboard plate 9 with a plasticized face is preheated by radiation on its plasticized face by preheating means 33, to bring its temperature at a preheating temperature T1 of about 100 ° C.
    Alternatively, the preheating station 32 may be placed downstream of the preforming station 31, to act not on the cardboard plate 9 before its preforming, but on the cardboard container 2 after its preforming. This alternative is favorable to the preservation of a high temperature of the carton before the subsequent thermoforming step.
    During a step C), in which the cardboard container 2 is placed in a thermoforming mold 34 in a thermoforming station 35, a plastic film 3 is brought with regard to the main opening of the cardboard container. 2, being observed that the cardboard container 2 cools progressively since its preheating in the preheating station 32 but still retains a sufficiently high temperature.
    During a step D), the plastic film 3 is heated by radiation 36 to a temperature permitting its plastic deformation.
    During a step E), the plastic film 3 is deformed, during or after its heating, to pressurize it against the inner plasticized face of the still hot cardboard container 2.
    It is considered that the inner plasticized face of the cardboard container 2 is "still hot" when its temperature is still at a T 2 adhesion temperature greater than 50 ° C, advantageously between 60 ° C and 80 ° C. In this way, good adhesion is achieved between the plastic material of the plasticized face of the cardboard container 2 and the plastic material of the plastic film 3.
    During step E), the penetration of the plastic film 3 into the cardboard container 2 is assisted by means of thrusting which may advantageously comprise means for injecting pressurized gas 37 onto the face outer of the plastic film 3, and / or gas suction means 38 in the interface between the thermoforming mold 34 and the cardboard container 2. Such means are commonly used in thermoforming techniques, and for this reason they are not described in detail.
    In practice, the depression produced by the gas suction means 38 is propagated at the interface between the cardboard container 2 and the plastic film 3 by passing either the cut stacking abutments 7a-7d previously described or the intermittent cutting lines making the fold lines 15-18.
    Advantageously, the thrust means produce an air overpressure of 400 000 to 600 000 Pa on the outer face of the plastic film 3, and a depression of 50 000 to 80 000 Pa in the interface between the cardboard container 2 and the plastic film 3.
    After a suitable cooling time, such as those generally used in thermoforming processes, and after cutting the periphery to remove excess plastic film, the tray 1 thus formed is removed. It will be noted that the cooling times generally used in thermoforming processes are satisfactory to simultaneously ensure the stiffening of the plastic film 3 and its reliable adhesion to the cardboard container 2.
    Considering Figure 8, we distinguish the main workstations of the trays manufacturing machine.
    There are arranged in line, the reserve 30 of cardboard plates 9, the preforming station 31, the preheating station 32, the thermoforming station 35, itself followed by a cutting station 40 for cutting the surplus plastic film device 3 after thermoforming.
    Arranged along a perpendicular line joining the preceding line in the thermoforming station 35, there is a radiation device 36 for heating the plastic film 3, and a feed station 39 made of plastic film 3.
    It will be noted, in the embodiment illustrated in FIG. 8, that the preforming station 31 is arranged upstream of the preheating station 32 in the direction of movement of the carton illustrated by the arrows 41. The displacement of the plastic film 3 , illustrated by the arrows 42, is made perpendicular to the movement 41 of the cardboard.
    In the embodiment illustrated in Figures 7 and 8, the thermoforming mold 34 remains permanently in the thermoforming station 35, and a separate preforming mold is used in the preforming station 31. A difficulty is that it must be reserved. sufficient access dimension for the introduction of the cardboard container 2 into the thermoforming station 35.
    An alternative solution may be to provide a thermoforming mold 34 itself movable between the thermoforming station 35 and the preforming station 31. The thermoforming mold 34 then serves both for preforming and for thermoforming, and the access to the mold for the introduction of the cardboard container 2 is facilitated in the preforming station 31.
    Advantageously, the plastic film 3 is initially in the form of a continuous strip, of greater width than the main face dimension of the cardboard container 2, so as to constitute the peripheral sidewalk 8 (FIGS. 1 to 4).
    Successive conveying means, for example consisting of structures known per se such as treadmills or robots, are interposed between the successive stations 30, 31, 32, 35 and 40, to move the cardboard plate 9, then the container. in cardboard 2, then the tray blank at the outlet of the thermoforming station 35, then the tray 1 at the output of the cutting station 40.
    In the embodiment illustrated in the figures, the tray-making machine preheats the cardboard plate 9 or the cardboard container 2 before insertion into the thermoforming station 35.
    Alternatively, it is possible to design, without departing from the scope of the present invention, a trays manufacturing machine in which the preheating of the carton takes place in the thermoforming station 35 itself, prior to the thermoforming step .
    Similarly, the preheating step of the plastic film 3 by the radiation means 36 can be performed either outside the thermoforming station 35 as shown in FIG. 8, or even inside the thermoforming station. 35, before or during thermoforming.
    The present invention is not limited to the embodiments which have been explicitly described, but it includes the various variants and generalizations thereof within the scope of the claims below.
    权利要求:
    Claims (15)
    [1" id="c-fr-0001]
    1 - A method of manufacturing a tray (1) intended to contain food, characterized in that it comprises the following steps: A) providing a hollow cardboard container (2) with a plasticized face, delimiting at least one cavity ( 4) between a container bottom wall (5) and a container side peripheral wall (6), with a main opening (7) in an opening plane (P) of the cavity (4) upwards, the the plasticized face of the carton being oriented towards the inside of the container (2), B) preheating the plasticized face of the carton to a preheating temperature (T1), C) providing a plastic film (3) with respect to the main opening (7) of the cardboard container (2), D) heating said film (3) to a temperature enabling its plastic deformation, E) deforming said film (3) during or after its heating, to pressurize it under pressure against the plasticized side of the cardboard container (2) still hot.
    [2" id="c-fr-0002]
    2 - Manufacturing method according to claim 1, characterized in that, after step B), the plasticized side of the cardboard container (2) is at a preheating temperature (T1) of about 100 ° vs.
    [3" id="c-fr-0003]
    3 - Manufacturing process according to one of claims 1 or 2, characterized in that, at the beginning of step E), the plasticized side of the cardboard container (2) is still at an adhesion temperature (T2) greater than 50 ° C, advantageously between 60 ° C and 80 ° C.
    [4" id="c-fr-0004]
    4 - Manufacturing method according to any one of claims 1 to 3, characterized in that: - before step E), the cardboard container (2) is engaged in a thermoforming mold (34), and - when of step E), penetration of the film (3) into said at least one cavity (4) of the cardboard container (2) is assisted by pushing means (37, 38).
    [5" id="c-fr-0005]
    5 - manufacturing method according to claim 4, characterized in that the thrust means (37, 38) comprises means for injecting gas under pressure (37) on the outer face of the film (3), and / or gas suction means (38) in the interface between the thermoforming mold (34) and the cardboard container (2).
    [6" id="c-fr-0006]
    6 - Manufacturing process according to one of claims 4 or 5, characterized in that the thrust means (37, 38) produce an air overpressure of 400 000 to 600 000 Pa on the outer face of the film (3) and an air depression of 50,000 to 80,000 Pa in the interface between the paperboard container (2) and the plastic film (3).
    [7" id="c-fr-0007]
    7 - Manufacturing method according to any one of claims 1 to 6, characterized in that step A) comprises the sequences: A1) provide a cardboard plate (9) cut, grooved, and plastic-coated face, A2) before or after step B) of preheating the plasticized face of the cardboard, preforming the cardboard plate (9) by folding to constitute said hollow cardboard container (2) delimiting at least one cavity (4) between a bottom wall container (5) and a container side peripheral wall (6), with a main opening (7) in an upwardly opening plane (P) of the cavity (4), the plasticized face of the carton being oriented towards inside the container (2).
    [8" id="c-fr-0008]
    8 - Manufacturing process according to any one of claims 1 to 7, characterized in that the plasticized side of the cardboard is mono polyethylene (PE) or polyethylene terephthalate (PET).
    [9" id="c-fr-0009]
    9 - Manufacturing process according to any one of claims 1 to 8, characterized in that the thickness of the plastic layer forming the plasticized side of the board is less than 30 microns.
    [10" id="c-fr-0010]
    10 - The manufacturing method according to any one of claims 1 to 9, characterized in that the film (3) is a multilayer film with a layer of polyethylene (PE), or a film of polyethylene terephthalate (PET).
    [11" id="c-fr-0011]
    11 - Manufacturing method according to any one of claims 1 to 10, characterized in that the plasticized side of the carton is of the same material as the film (3).
    [12" id="c-fr-0012]
    12 - Machine for manufacturing a tray (1) implementing a manufacturing method according to any one of claims 1 to 11.
    [13" id="c-fr-0013]
    13 - Manufacturing machine according to claim 12, characterized in that it comprises: - conveying means for bringing one to one of the hollow cardboard containers (2) at a thermoforming station (35), - preheating means (33), for preheating at least one container face (2) before thermoforming, in a preheating station 32, a thermoforming station (35), with means for feeding into a thermoforming mold (34) a container cardboard (2) from the conveying means, with means for feeding a film of plastic material (3) facing the opening of the thermoforming mold, means (36) for heating the film (3), and means (37, 38) for selectively pressing the film (3) into the hollow of the previously preheated paperboard container (2) while the preheated container (2) is still hot.
    [14" id="c-fr-0014]
    14 - Manufacturing machine according to claim 13, characterized in that it further comprises: - storage means (30) of a stack of cardboard plates (9) pre-cut and grooved along fold lines (15- 18), preforming means (31) for preforming the cardboard plates (9) and thus constitute hollow cardboard containers (2).
    [15" id="c-fr-0015]
    15 - Manufacturing machine according to one of claims 13 or 14, characterized in that the preheating means (33) are able to preheat a face of the board at a preheating temperature (T1) of about 100 ° C.
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    FR2613982A1|1988-10-21|Method of manufacturing composite containers by thermoforming a sheet of plastic, and containers obtained
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    EP3501813A2|2019-06-26|Method and machine for manufacturing packaging, packaging obtained
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    FR3019800A1|2015-10-16|STACKABLE TRAY.
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    同族专利:
    公开号 | 公开日
    FR3040654B1|2018-03-23|
    EP3141373A1|2017-03-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3697369A|1964-12-04|1972-10-10|Owens Illinois Inc|Plastic lined receptacle or the like|
    US3866816A|1970-10-26|1975-02-18|Robalex Inc Trustee|Boilable bakeable package and method|
    US3756495A|1972-03-02|1973-09-04|Robalex Inc|Boilable bakeable package|
    FR2406522A1|1977-10-21|1979-05-18|Sprinter System Ab|PROCEDURE FOR MANUFACTURING A BOX IN THERMOPLASTIC MATERIAL PROVIDED WITH AN OUTER CARDBOARD ENCLOSURE, AS WELL AS A BOX MANUFACTURED ACCORDING TO THIS PROCEDURE|
    FR2483307A1|1980-06-02|1981-12-04|Sandherr Ag M|PROCESS FOR MANUFACTURING A CONTAINER IN PLASTIC MATERIAL BY DEEP STAMPING AND CONTAINER CARRIED OUT ACCORDING TO THIS PROCESS|
    DE29601117U1|1996-01-24|1996-08-01|Akerlund & Rausing Ab|Composite material containers|
    JP2004276317A|2003-03-13|2004-10-07|Toppan Printing Co Ltd|Composite container manufacturing method|
    FR2826938B1|2001-07-04|2004-01-16|Marie Claude Dropsy|SEALABLE RECYCLABLE CONTAINER|
    GB0808604D0|2008-05-13|2008-06-18|Benson Box Company The Limted|Food packaging|
    FR2933329B1|2008-07-04|2016-12-30|Marie Claude Dropsy|NEW PROCESS FOR MANUFACTURING A BI-COMPONENT TRAY|
    FR2975973B1|2011-05-30|2014-04-04|Formkraft|METHOD FOR MANUFACTURING A CARTON SEALED IN CARDBOARD FOR CARRYING OUT A PACKAGING FOR PACKAGING PRODUCTS|WO2018202805A1|2017-05-03|2018-11-08|Gea Food Solutions Germany Gmbh|Packaging system comprising a fiber molding|
    FR3075766A1|2017-12-22|2019-06-28|Groupe Guillin|METHOD AND MACHINE FOR MANUFACTURING PACKAGES, PACKAGES OBTAINED|
    FR3103792A1|2019-12-03|2021-06-04|Sagem Networks|Food tray|
    法律状态:
    2016-08-19| PLFP| Fee payment|Year of fee payment: 2 |
    2017-03-10| PLSC| Publication of the preliminary search report|Effective date: 20170310 |
    2017-09-11| PLFP| Fee payment|Year of fee payment: 3 |
    2018-09-04| PLFP| Fee payment|Year of fee payment: 4 |
    2019-09-11| PLFP| Fee payment|Year of fee payment: 5 |
    2020-09-29| PLFP| Fee payment|Year of fee payment: 6 |
    2021-09-03| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1558282A|FR3040654B1|2015-09-07|2015-09-07|PROCESS AND MACHINE FOR THE MANUFACTURE OF THERMOSOUDE COMPOSITE TRAY|FR1558282A| FR3040654B1|2015-09-07|2015-09-07|PROCESS AND MACHINE FOR THE MANUFACTURE OF THERMOSOUDE COMPOSITE TRAY|
    EP16187674.3A| EP3141373A1|2015-09-07|2016-09-07|Method and machine for manufacturing composite heat-welded trays and tray|
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