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WO2024240665A1 - Mould and method for overmoulding a tableware receptacle - Google Patents

Mould and method for overmoulding a tableware receptacle Download PDF

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Publication number
WO2024240665A1
WO2024240665A1 PCT/EP2024/063741 EP2024063741W WO2024240665A1 WO 2024240665 A1 WO2024240665 A1 WO 2024240665A1 EP 2024063741 W EP2024063741 W EP 2024063741W WO 2024240665 A1 WO2024240665 A1 WO 2024240665A1
Authority
WO
WIPO (PCT)
Prior art keywords
container
mold
face
imprint
central
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/EP2024/063741
Other languages
French (fr)
Inventor
Sébastien Chauvin
Pierre BUSQUET
Benat BERHOUET
Mikel GAILLARD
Mikel CURUTCHARRY
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of WO2024240665A1 publication Critical patent/WO2024240665A1/en
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14336—Coating a portion of the article, e.g. the edge of the article
    • B29C45/14434—Coating brittle material, e.g. glass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14065—Positioning or centering articles in the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14836—Preventing damage of inserts during injection, e.g. collapse of hollow inserts, breakage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/37—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings
    • B29C45/376—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings adjustable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14065—Positioning or centering articles in the mould
    • B29C2045/14098—Positioning or centering articles in the mould fixing or clamping inserts having variable dimensions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14065—Positioning or centering articles in the mould
    • B29C2045/14155—Positioning or centering articles in the mould using vacuum or suction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14336—Coating a portion of the article, e.g. the edge of the article
    • B29C45/14418—Sealing means between mould and article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/1459—Coating annular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14778—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the article consisting of a material with particular properties, e.g. porous, brittle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2083/00—Use of polymers having silicon, with or without sulfur, nitrogen, oxygen, or carbon only, in the main chain, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2709/00—Use of inorganic materials not provided for in groups B29K2703/00 - B29K2707/00, for preformed parts, e.g. for inserts
    • B29K2709/08—Glass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0046—Elastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/74—Domestic articles
    • B29L2031/7404—Dishes

Definitions

  • TITLE MOLD AND METHOD FOR OVERMOLDING A DISHWARE CONTAINER
  • the present disclosure relates to the field of overmolding of tableware containers, in particular the overmolding of containers intended to contain food with a flexible material.
  • the tableware can be sprayed with a so-called RTV silicone (for room-temperature vulcanizing or silicone vulcanizing at room temperature).
  • RTV silicone for room-temperature vulcanizing or silicone vulcanizing at room temperature.
  • This process consists of spreading or spraying the malleable silicone, making it possible to cover the tableware, the crosslinking or hardening of the silicone advantageously taking place at room temperature.
  • RTV silicone has a high viscosity even at room temperature, and is therefore not suitable for rapid and precise overmolding of the tableware.
  • This material has the advantage of exhibiting highly thixotropic properties, that is to say that, when subjected to shear stresses - as is the case during injection under pressure into a mold - its viscosity decreases sharply and it exhibits a liquid state, allowing the material to spread rapidly by adopting the shape imposed by the mold and the tableware.
  • LSR silicone can crosslink much more quickly than RTV silicone, typically in less than a minute, and thus significantly reduce the time required for overmolding the tableware.
  • This type of process is carried out in a mold made of a hard material, particularly steel, so as to ensure that the mold is not damaged during use, and tolerances between the mold and the fins of the container are avoided as much as possible.
  • tempered glass tableware which is cheaper and much lighter than tableware made of materials such as ceramic or earthenware.
  • Thermal tempering of the glass gives it a mechanical strength suitable for food use, but has the consequence of deforming the tableware, which in its tempered state has variations in diameter and height of up to several millimetres - i.e. it is neither perfectly round nor perfectly flat, unlike porcelain or earthenware tableware.
  • An objective of the present application is to propose a mold and a method for injection molding a tableware container that are suitable for tempered glass tableware and the dimensional irregularities it presents, i.e. which allow overmolding of the tableware without cracking it.
  • Another objective of the present application is to enable a seal between the container and the mold which is satisfactory for the injection of LSR silicone, despite such irregularities in the size of the container.
  • Another objective of the present application is to provide a mold and a method allowing rapid and precise overmolding of tableware despite such dimensional irregularities.
  • Another objective of this application is to propose a mold and a process suitable for industrial-scale production, allowing the production of silent tableware, in particular for use in collective catering establishments.
  • the present disclosure relates, according to a first aspect, to a mold for injection overmolding a tableware container with a material comprising silicone, the mold comprising a female part and a male part, the female part comprising: o an imprint configured to accommodate a first face of the tableware container during overmolding, o an injection nozzle configured to allow the injection of the material comprising silicone into the imprint on the first face, the male part comprising: o a central stud formed from a material having a Shore D hardness of between 50 and 60 or comprising a coating made from a material having a Shore D hardness of between 50 and 60, configured to receive a second face of the tableware container, o a peripheral seal formed from a material having a Shore A hardness of between 50 and 60, and configured to receive edges of the tableware container, the peripheral seal extending circumferentially around the central stud, o a shaping cavity extending circumferentially between the central stud and the peripheral seal, the shaping cavity and the peripheral seal
  • the container is free to move sufficiently so as not to be subjected to stresses which would exceed its mechanical strength, while being supported so as to guarantee a distribution of the forces over its entire surface, thus avoiding excessively high local stresses, and presenting a seal with the mold sufficient for the injection of liquid silicone.
  • the mold comprises a vacuum pump connected to a central orifice opening into a central area of the pad so as to retain the second face on the central pad by suction.
  • the mold comprises a vacuum drawing system opening into the female part opposite the first face or opposite the male part.
  • the peripheral seal and/or the central stud comprises a material having non-stick properties, in particular polytetrafluoroethylene, or is/are covered with a coating comprising a material having non-stick properties, in particular polytetrafluoroethylene.
  • the peripheral seal and/or the shaping cavity being adapted to allow a displacement of the edges of less than 3 millimeters, preferably between 1 and 3 millimeters, more preferably between 1 and 2 millimeters.
  • the mold comprises at least one pusher arranged in the imprint of the female part and capable of moving the container away from the imprint by pushing on the first face.
  • said at least one pusher extends over the entire circumference of the imprint.
  • the present disclosure relates according to a second aspect to a method of overmolding a tableware container with a material comprising silicone, comprising the steps of: a. positioning the container in a mold according to any one of the preceding claims, a second face of the container being placed on the central stud and edges of the container being received on the peripheral seal, b. closing the mold by bringing the female part opposite the male part so as to retain the container between the female part and the male part, c. injecting the material comprising silicone through the injection nozzle until the first face is covered with said material, d. opening the mold and removing the container therefrom.
  • the method further comprises a step of drawing a vacuum from the air disposed between the second face and the central pad by means of a vacuum pump connected to a central orifice opening into a central zone of the pad, so as to retain the second face of the container on the central pad.
  • the method further comprises a step of vacuum drawing the air disposed between the first face and the imprint by means of a vacuum drawing system so as to facilitate the injection of the material comprising silicone into the imprint.
  • the method comprises, before or during the mold opening step, a step of separation between the first face of the container and the female part, implemented by actuating pushers arranged in the imprint of the female part.
  • the dishware container is a tempered glass container.
  • the container is a plate or a ramekin.
  • FIG. 1 schematically illustrates a tableware container obtained by an overmolding process as proposed
  • FIG. 3 schematically illustrates a process for overmolding a tableware container as proposed.
  • an injection overmolding mold is provided.
  • a container 20 comprises a first face 21 intended to rest on a table or tray and a second face 22 receiving the food placed on or in the container.
  • the container 20 further comprises edges 23, extending circumferentially around a central portion 24.
  • the edges 23 may extend parallel to the central portion 24, for a flat plate, or have a more or less significant angle with this central portion 24. It is also possible for the central portion 24 and/or the edges 23 to be at least partly curvilinear, for example in the case of a bowl or a ramekin.
  • the proposed mold 10 is shown in Figure 2. It comprises a male part 11 and a female part 12.
  • the female part 12 is provided with an imprint 13 configured to receive, in use, the first face 21 of the dish container 20, while the male part 11 is provided with a central stud 1 configured to receive the second face 22 of the container 20.
  • a main axis X of the mold is defined as being an axis perpendicular to the planes formed on the one hand by the surface of the female part 12 on which the imprint 13 is arranged, and on the other hand by the surface of the male part 11 on which the stud 1 rests.
  • the main axis X also passes through the respective centers of the imprint 13 and the stud 1. Said main axis also defines the opening-closing direction of the mold.
  • the shapes of the imprint and the stud must be adapted to the geometry of the container 20 that it is desired to overmold.
  • several separate molds 10 can be used.
  • the female part 12 comprises an injection nozzle 9 by means of which a material comprising silicone can be injected into the imprint 13, in order to cover the first face 21 with said material.
  • the nozzle 10 is preferably arranged in the middle of the imprint 13, but can be arranged in other positions allowing it to open into the imprint 13.
  • the central stud 1 of the male part 11 must be formed of a flexible material, and having a sufficiently low coefficient of friction to allow movement of the container 20.
  • flexible we mean a material with a Shore D hardness of between 50 and 60.
  • the central stud 1 can be formed of a harder material, but covered with a coating with a sufficiently low coefficient of friction to allow movement of the container 20, and having a Shore D hardness of between 50 and 60. Due to these mechanical properties, the surface of the central stud 1 can receive the second face 22 of the container 20 so as to allow movement of the container 20 perpendicular to the main axis X of the mold 10.
  • the container 20 naturally takes the position in which the forces due to the injection pressure are distributed over its surface, and the risk of locally concentrated forces developing that could damage the container 20 is minimized.
  • the mold 10 is particularly suitable for overmolding tempered glass containers 20, which have dimensional irregularities along the three axes, for the reasons cited above.
  • the central pad 1 comprises a material having non-stick properties, in particular polytetrafluoroethylene - known under the trademark Teflon®.
  • the central pad 1 may also be made of another material covered with a non-stick coating.
  • a peripheral seal 3 extends in a circle centered on the main axis X, so as to be at a distance from the main axis X greater than that corresponding to the circumference of the stud 1.
  • This peripheral seal has the function of serving as a support for the edges 23 of the dishware container 20 when the latter is placed in the mold 10.
  • the seal 3 is formed of a flexible material, the Shore A hardness of which is between 50 and 60. In a manner similar to the stud 1, the flexibility of the peripheral seal 3 allows the edges 23 of the container 20 to move during overmolding so as to ensure the best possible distribution of the forces on the surface of the container 20.
  • the peripheral seal 3 comprises a material having non-stick properties, in particular polytetrafluoroethylene - known under the trademark Teflon®.
  • the peripheral seal 3 may also be made of another material covered with a non-stick coating. This feature has the advantage of preventing the edges 23 of the container from adhering to the peripheral seal 3, and therefore of facilitating the removal of the container 20 from the mold 10 after overmolding.
  • the surface of the male part 11 forms a shaping cavity 2, that is to say that the part of the edges 23 of the container 20 located between the stud 1 and the peripheral seal 3 in a direction perpendicular to the main axis X does not rest directly on the male part 11, the shaping cavity 2 being located between this part of the edges 23 and the surface of the male part 11.
  • the shaping cavity 2 thus contributes, together with the peripheral seal 3 and the stud 1, to allowing movement of the container 20 during overmolding.
  • the peripheral seal 3 and/or the shaping cavity 2 can be adapted to allow a displacement of the edges 23 of less than 3 millimeters, preferably between 1 and 3 millimeters, and even more preferably between 1 and 2 millimeters.
  • the mold 10 comprises a closing system capable of moving the male part 11 and the female part 12 relative to each other.
  • the closing system may be capable of moving the male part 11 and/or the female part 12.
  • the closing system may in particular comprise jacks, such as hydraulic or pneumatic jacks.
  • the mold 10 may be a horizontal press mold, i.e. comprising jacks arranged horizontally, the surfaces of the male 11 and female 12 parts then extending along a vertical plane, or a vertical press mold with jacks arranged vertically, the surfaces of the male 11 and female 12 parts then extending along a horizontal plane.
  • the mold 10 may, according to a particular embodiment, comprise a vacuum pump 5 in order to retain the second face 22 of the container 20 on the central pad 1 by suction, once the plate is positioned in the mold 10.
  • This vacuum pump 5 is particularly suitable when the mold 10 is of the horizontal press type, because the faces 21, 22 of the container are then arranged in a vertical plane once placed in the mold, and it is therefore necessary to ensure that the container 20 is pressed against the stud 1 when the mold 10 is not in the fully closed position.
  • a vacuum pump 5 can also be provided when the mold 10 is of the vertical press type.
  • the vacuum pump 5 is connected to an orifice 7 opening into the pad 1, preferably in the center thereof.
  • a conduit 6 may be provided to connect the pump 5 to the orifice 7.
  • the support seal 15 is a circular seal, centered on the main axis X and arranged on the surface of the central pad 1. This seal has adhesive properties making it possible to ensure the maintenance of the second face 22 on the central pad 1, including when the mold 10 is of the horizontal press type.
  • the mold 10 may comprise a vacuum system 4. Such a system opens into the female part 12 either directly opposite the first face 21 of the container 20 when the latter is placed in the mold 10, or opposite the male part 11.
  • the vacuum system 4 makes it possible to reduce the pressure of the air located between the container 20 and the female part 12, thus facilitating the injection of silicone through the nozzle 9.
  • the mold comprises, according to one embodiment, one or more pushers 14 arranged in the imprint 13 and capable of moving the container 20 away from the imprint 13. This may be a plurality of pushers 14 or a single circular pusher, centered on the main axis X and extending over the entire circumference of the imprint 13. This eliminates the need to use special products to detach the material, reducing the operating costs of the mold.
  • this embodiment has the advantage of being easily automatable - it is sufficient to provide for actuation of the pusher(s) 14 when it is necessary to separate the container 20 from the mold 10 - and is therefore suitable for use on an industrial scale.
  • the method comprises, in its most general embodiment, a step 101 of positioning the container 20 in the mold 10, the second face 22 of the container 20 being placed on the central stud 1, the peripheral seal 3 receiving the edges 23 of the container 20.
  • a closing step 102 is implemented, according to which the female part 12 is brought opposite the male part 11 by actuating the closing system of the mold 10.
  • the container is then retained between the male and female parts 11, 12 and does not move until the injection of material has begun.
  • This is followed by an injection step 105 of the material comprising silicone, preferably a liquid silicone rubber, through the injection nozzle 9 arranged in the female part 12 so as to cover the entire first face 21 of the injected material.
  • the container 20 will be free to adopt a position which reduces the local forces, due to the particular characteristics of the mold 10 described above.
  • a mold opening step 107 is implemented, allowing the container 20 to be removed from the mold 10.
  • edges 23 of the container 20 it is not necessary for the edges 23 of the container 20 to reach, over the entire circumference thereof, the end of the peripheral seal 3 furthest from the main axis X. Due to the variability in the size of the container, it is possible that the edges 23 do not reach the same position of the peripheral seal 3 over the entire circumference of the container 20. It will then be possible to inject a thicker layer of material at the circumferential positions where the container 20 has a reduced diameter, so as to obtain an overmolded container of substantially uniform diameter after implementing the overmolding method 100.
  • the material injected through the injection nozzle 9 has a direct impact on the quality of the overmolded container 20 obtained.
  • the material injected during the injection step 105 is a liquid silicone gum having self-adhesive properties. This ensures that a tableware container 20 having satisfactory molecular cohesion between the injected silicone and the material of which the container 20, before implementation of the overmolding method 100, is made.
  • a vacuum drawing step 103 is carried out before the injection step 105 so as to retain the second face 22 of the container 20 on the central stud 1, either after closing 102 of the mold 10, or directly after positioning 101 of the container 20 on the central stud 1, in particular when the mold 10 is of the horizontal press type and the container 20 could not hold on the central stud 1 in the absence of a vacuum drawing.
  • the method when the female part 12 comprises a vacuum drawing system 4, the method can comprise a step of vacuum drawing 104 of the air arranged between the first face 21 and the imprint 13 by means of the vacuum drawing system 4, so as to reduce as much as possible the pressure between the first face 21 and the imprint 13 and to facilitate the movement of the injected material, which covers the first surface 21. It is thus possible to reduce the time required for the injection step 105 and to avoid premature crosslinking of the injected material.
  • the vacuum drawing step 104 by the vacuum drawing system 4 is carried out after the mold closing step 102, and before or after a possible vacuum drawing step 103 by the vacuum pump 5.
  • a step 106 of moving the first face 21 of the container 20 away from the female part 12 is implemented either after the opening step 107, or possibly during the opening 107 of the mold 10.
  • the moving away 6 is carried out by actuating the pushers 14 arranged in the imprint 13 of the female part 12.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

According to a first aspect, the invention provides a mould (10) for injection-overmoulding a tableware receptacle (20) with a material comprising silicone, the mould (10) comprising a female portion (12) and a male portion (11), the female portion (12) comprising: ○ a cavity (13) configured to accommodate a first face (21) of the tableware receptacle during overmoulding; ○ an injection nozzle (9) configured to allow the material comprising silicone to be injected into the cavity (13) over the first face (21), the male portion comprising: ○ a central pad (1) formed of a material having a Shore D hardness of between 50 and 60 or comprising a coating made of a material having a Shore D hardness of between 50 and 60 configured to accommodate a second face (22) of the tableware receptacle; ○ a peripheral seal (3) formed of a material having a Shore A hardness of between 50 and 60, and configured to accommodate edges (23) of the tableware receptacle (20), the peripheral seal extending circumferentially around the central pad; ○ a shaping recess (2) that extends circumferentially between the central pad (1) and the peripheral seal (3), the shaping recess (2) and the peripheral seal (3) being suitable for allowing the edges (23) to move during overmoulding.

Description

DESCRIPTION DESCRIPTION

TITRE : MOULE ET PROCÉDÉ DE SURMOULAGE D’UN RÉCIPIENT DE VAISSELLE TITLE: MOLD AND METHOD FOR OVERMOLDING A DISHWARE CONTAINER

DOMAINE TECHNIQUE TECHNICAL AREA

La présente divulgation concerne le domaine du surmoulage de récipients de vaisselle, notamment du surmoulage de récipients destinés à contenir des aliments avec un matériau souple. The present disclosure relates to the field of overmolding of tableware containers, in particular the overmolding of containers intended to contain food with a flexible material.

ETAT DE LA TECHNIQUE STATE OF THE ART

Dans les établissements de restauration collective, tels que les cantines d’écoles, d’université ou les établissements d’hébergement pour personnes âgées, l’utilisation de vaisselle génère un bruit considérable du fait des chocs entre différents ustensiles de vaisselle. Outre le désagrément que cela engendre pour les utilisateurs de tels établissements, le bruit ainsi généré affecte la santé des employés de ces établissements, qui subissent ce bruit plusieurs heures par jour sur leur lieu de travail. In collective catering establishments, such as school canteens, university canteens or accommodation establishments for the elderly, the use of dishes generates considerable noise due to the impact between different dishes. In addition to the inconvenience this causes for users of such establishments, the noise thus generated affects the health of the employees of these establishments, who are subjected to this noise for several hours a day at their workplace.

En effet, des études ont montré que les fréquences sonores de chocs entre ustensiles de vaisselle peuvent atteindre des valeurs élevées au-delà de 1 .5 kHz qui sont préjudiciables au confort et la santé des êtres humains. Une exposition prolongée à de telles fréquences sonores pose ainsi un réel problème de santé publique. Indeed, studies have shown that the sound frequencies of impacts between tableware can reach high values beyond 1.5 kHz which are detrimental to the comfort and health of human beings. Prolonged exposure to such sound frequencies thus poses a real public health problem.

Afin de réduire les bruits dus à ces chocs, il est connu d’utiliser une vaisselle recouverte d’un matériau souple tel que du silicone. Deux procédés permettent avantageusement de fabriquer une vaisselle bi-matériau comprenant du silicone. Premièrement, on peut réaliser une projection de la vaisselle avec un silicone dit RTV (pour l’anglais room-temperature vulcanising ou silicone vulcanisant à température ambiante). Ce procédé consiste à étaler ou à projeter le silicone malléable, permettant de recouvrir la vaisselle, la réticulation ou durcissement du silicone ayant avantageusement lieu à température ambiante. Cependant, le silicone RTV présente une viscosité importante même à température ambiante, et n’est donc pas adapté à un surmoulage rapide et précis de la vaisselle. Notamment, lorsque la forme de la vaisselle est complexe, le matériau prend un temps considérable pour recouvrir la vaisselle, et ne peut pas épouser précisément sa forme, et il peut être nécessaire de post-traiter la vaisselle après le surmoulage pour obtenir le produit fini désiré. On génère ainsi un gâchis de matière et donc une pollution et des coûts de production indésirables. En outre, le temps nécessaire à la réticulation du silicone RTV peut aller jusqu’à plusieurs jours, rendant de tels procédés inadaptés à une production de vaisselle à échelle industrielle. Un autre procédé permettant la fabrication d’une vaisselle bi-matériau est l’injection de gomme de silicone liquide (LSR pour l’anglais Liquid Silicone Rubber). Ce matériau a l’avantage de présenter des propriétés hautement thixotropiques, c’est-à-dire que, lorsqu’il est soumis à des contraintes de cisaillement - tel que c’est le cas lors d’une injection sous pression dans un moule - sa viscosité diminue fortement et il présente un état liquide, permettant au matériau de se répandre rapidement en adoptant la forme imposée par le moule et la vaisselle. En outre, le silicone LSR peut réticuler beaucoup plus rapidement que le silicone RTV, typiquement en moins d’une minute, et ainsi permettre de réduire significativement le temps nécessaire au surmoulage de la vaisselle. On réalise ce type de procédé dans un moule en matériau dur, notamment en acier, de sorte à garantir que le moule ne s’endommage pas durant son utilisation, et on évite autant que possible les tolérances entre le moule et les ailettes du récipient. In order to reduce the noise caused by these impacts, it is known to use tableware covered with a flexible material such as silicone. Two processes advantageously make it possible to manufacture bi-material tableware comprising silicone. First, the tableware can be sprayed with a so-called RTV silicone (for room-temperature vulcanizing or silicone vulcanizing at room temperature). This process consists of spreading or spraying the malleable silicone, making it possible to cover the tableware, the crosslinking or hardening of the silicone advantageously taking place at room temperature. However, RTV silicone has a high viscosity even at room temperature, and is therefore not suitable for rapid and precise overmolding of the tableware. In particular, when the shape of the tableware is complex, the material takes a considerable amount of time to cover the tableware, and cannot precisely match its shape, and it may be necessary to post-treat the tableware after overmolding to obtain the desired finished product. This generates a waste of material and therefore pollution and undesirable production costs. Furthermore, the time required for RTV silicone to cure can be up to several days, making such processes unsuitable for industrial-scale tableware production. Another process for manufacturing bi-material tableware is the injection of liquid silicone rubber (LSR). This material has the advantage of exhibiting highly thixotropic properties, that is to say that, when subjected to shear stresses - as is the case during injection under pressure into a mold - its viscosity decreases sharply and it exhibits a liquid state, allowing the material to spread rapidly by adopting the shape imposed by the mold and the tableware. In addition, LSR silicone can crosslink much more quickly than RTV silicone, typically in less than a minute, and thus significantly reduce the time required for overmolding the tableware. This type of process is carried out in a mold made of a hard material, particularly steel, so as to ensure that the mold is not damaged during use, and tolerances between the mold and the fins of the container are avoided as much as possible.

Cependant, pour une production à échelle industrielle, il est souhaitable d’utiliser une vaisselle en verre trempé, qui est moins chère et bien plus légère qu’une vaisselle faite de matériaux tels que la céramique ou la faïence. La trempe thermique du verre permet de lui conférer une résistance mécanique adaptée à un usage alimentaire, mais a pour conséquence de déformer la vaisselle, qui présente dans son état trempé des variations de diamètre et de hauteur pouvant aller jusqu’à plusieurs millimètres - c’est-à-dire qu’elle n’est ni parfaitement ronde, ni parfaitement plate, contrairement à la vaisselle en porcelaine ou en faïence. Ces variations de dimension rendent la vaisselle en verre trempé inadaptée aux procédés connus de surmoulage par injection, par exemple avec du silicone LSR : la vaisselle fissure ou casse à cause de la pression considérable qu’elle subit durant l’injection - pouvant aller jusqu’à environ 700 bars - pression nécessaire afin de réduire au maximum la durée du cycle de production d’un récipient de vaisselle, le temps d’injection nécessaire évoluant inversement avec la pression d’injection. Cette pression, et la réduction du temps d’injection associée, sont également nécessaires afin d’éviter que le silicone ne réticule au contact du moule, du fait de la température élevée de celui-ci. However, for industrial-scale production, it is desirable to use tempered glass tableware, which is cheaper and much lighter than tableware made of materials such as ceramic or earthenware. Thermal tempering of the glass gives it a mechanical strength suitable for food use, but has the consequence of deforming the tableware, which in its tempered state has variations in diameter and height of up to several millimetres - i.e. it is neither perfectly round nor perfectly flat, unlike porcelain or earthenware tableware. These dimensional variations make tempered glass tableware unsuitable for known injection overmoulding processes, for example with LSR silicone: the tableware cracks or breaks due to the considerable pressure it is subjected to during injection - which can be up to around 700 bars - a pressure necessary in order to reduce the production cycle time of a tableware container as much as possible, the injection time required evolving inversely with the injection pressure. This pressure, and the associated reduction in injection time, are also necessary to prevent the silicone from crosslinking on contact with the mold, due to its high temperature.

EXPOSE EXPOSED

Un objectif de la présente demande est de proposer un moule ainsi qu’un procédé de surmoulage par injection d’un récipient de vaisselle qui soient adaptés à une vaisselle en verre trempé et aux irrégularités de dimension qu’elle présente, c’est-à-dire qui permette un surmoulage de la vaisselle sans la fissurer. An objective of the present application is to propose a mold and a method for injection molding a tableware container that are suitable for tempered glass tableware and the dimensional irregularities it presents, i.e. which allow overmolding of the tableware without cracking it.

Un autre objectif de la présente demande est de permettre une étanchéité entre le récipient et le moule qui soit satisfaisante pour l’injection de silicone LSR, malgré de telles irrégularités de dimension du récipient. Un autre objectif de la présente demande est de proposer un moule et un procédé permettant un surmoulage rapide et précis de la vaisselle malgré de telles irrégularités de dimension. Another objective of the present application is to enable a seal between the container and the mold which is satisfactory for the injection of LSR silicone, despite such irregularities in the size of the container. Another objective of the present application is to provide a mold and a method allowing rapid and precise overmolding of tableware despite such dimensional irregularities.

Un autre objectif de la présente demande est de proposer un moule et un procédé adaptés à une production à échelle industrielle, permettant la production de vaisselle silencieuse notamment pour un usage dans des établissements de restauration collective. Another objective of this application is to propose a mold and a process suitable for industrial-scale production, allowing the production of silent tableware, in particular for use in collective catering establishments.

A cet effet, la présente divulgation concerne selon un premier aspect un moule de surmoulage par injection d’un récipient de vaisselle avec un matériau comprenant du silicone, le moule comprenant une partie femelle et une partie mâle, la partie femelle comprenant : o une empreinte configurée pour accueillir une première face du récipient de vaisselle durant le surmoulage, o une buse d’injection configurée pour permettre l’injection du matériau comprenant du silicone dans l’empreinte sur la première face, la partie mâle comprenant : o un plot central formé d’un matériau présentant une dureté Shore D comprise entre 50 et 60 ou comprenant un revêtement en matériau présentant une dureté Shore D comprise entre 50 et 60, configuré pour recevoir une deuxième face du récipient de vaisselle, o un joint périphérique formé d’un matériau présentant une dureté Shore A comprise entre 50 et 60, et configuré pour recevoir des bords du récipient de vaisselle, le joint périphérique s’étendant circonférentiellement autour du plot central, o une cavité de conformation s’étendant circonférentiellement entre le plot central et le joint périphérique, la cavité de conformation et le joint périphérique étant adaptés pour permettre un déplacement des bords durant le surmoulage. For this purpose, the present disclosure relates, according to a first aspect, to a mold for injection overmolding a tableware container with a material comprising silicone, the mold comprising a female part and a male part, the female part comprising: o an imprint configured to accommodate a first face of the tableware container during overmolding, o an injection nozzle configured to allow the injection of the material comprising silicone into the imprint on the first face, the male part comprising: o a central stud formed from a material having a Shore D hardness of between 50 and 60 or comprising a coating made from a material having a Shore D hardness of between 50 and 60, configured to receive a second face of the tableware container, o a peripheral seal formed from a material having a Shore A hardness of between 50 and 60, and configured to receive edges of the tableware container, the peripheral seal extending circumferentially around the central stud, o a shaping cavity extending circumferentially between the central stud and the peripheral seal, the shaping cavity and the peripheral seal being adapted to allow movement of the edges during overmolding.

Ainsi, le récipient est libre de se déplacer suffisamment pour ne pas être soumis à des contraintes qui excéderaient sa résistance mécanique, tout en étant supporté de sorte à garantir une répartition des efforts sur l’intégralité de sa surface, évitant ainsi des contraintes locales trop élevées, et en présentant une étanchéité avec le moule suffisante pour l’injection de silicone liquide. Selon un mode de réalisation, le moule comprend une pompe à vide reliée à un orifice central débouchant dans une zone centrale du plot de sorte à retenir la deuxième face sur le plot central par aspiration. Thus, the container is free to move sufficiently so as not to be subjected to stresses which would exceed its mechanical strength, while being supported so as to guarantee a distribution of the forces over its entire surface, thus avoiding excessively high local stresses, and presenting a seal with the mold sufficient for the injection of liquid silicone. According to one embodiment, the mold comprises a vacuum pump connected to a central orifice opening into a central area of the pad so as to retain the second face on the central pad by suction.

Selon un mode de réalisation, le moule comprend un système de tirage à vide débouchant dans la partie femelle en regard de la première face ou en regard de la partie mâle. According to one embodiment, the mold comprises a vacuum drawing system opening into the female part opposite the first face or opposite the male part.

Selon un mode de réalisation, le joint périphérique et/ou le plot central comprend un matériau présentant des propriétés anti-adhésives, notamment du polytétrafluoroéthylène, ou est/sont recouvert(s) d’un revêtement comprenant un matériau présentant des propriétés anti- adhésives, notamment du polytétrafluoroéthylène. According to one embodiment, the peripheral seal and/or the central stud comprises a material having non-stick properties, in particular polytetrafluoroethylene, or is/are covered with a coating comprising a material having non-stick properties, in particular polytetrafluoroethylene.

Selon un mode de réalisation, le joint périphérique et/ou la cavité de conformation étant adaptés pour permettre un déplacement des bords inférieur à 3 millimètres, de préférence compris entre 1 et 3 millimètres, encore préférentiellement compris entre 1 et 2 millimètres. According to one embodiment, the peripheral seal and/or the shaping cavity being adapted to allow a displacement of the edges of less than 3 millimeters, preferably between 1 and 3 millimeters, more preferably between 1 and 2 millimeters.

Selon un mode de réalisation, le moule comprend au moins un poussoir disposé dans l’empreinte de la partie femelle et apte à éloigner le récipient de l’empreinte en poussant sur la première face. According to one embodiment, the mold comprises at least one pusher arranged in the imprint of the female part and capable of moving the container away from the imprint by pushing on the first face.

Selon un mode de réalisation, ledit au moins un poussoir s’étend sur toute la circonférence de l’empreinte. According to one embodiment, said at least one pusher extends over the entire circumference of the imprint.

La présente divulgation concerne selon un deuxième aspect un procédé de surmoulage d’un récipient de vaisselle avec un matériau comprenant du silicone, comprenant les étapes de : a. positionner le récipient dans un moule selon l’une quelconque des revendications précédentes, une deuxième face du récipient étant placée sur le plot central et des bords du récipient étant reçues sur le joint périphérique, b. fermer le moule en amenant la partie femelle en regard de la partie mâle de sorte à retenir le récipient entre la partie femelle et la partie mâle, c. injecter le matériau comprenant du silicone par la buse d’injection jusqu’à ce que la première face soit recouverte dudit matériau, d. ouvrir le moule et en retirer le récipient. The present disclosure relates according to a second aspect to a method of overmolding a tableware container with a material comprising silicone, comprising the steps of: a. positioning the container in a mold according to any one of the preceding claims, a second face of the container being placed on the central stud and edges of the container being received on the peripheral seal, b. closing the mold by bringing the female part opposite the male part so as to retain the container between the female part and the male part, c. injecting the material comprising silicone through the injection nozzle until the first face is covered with said material, d. opening the mold and removing the container therefrom.

Selon une mise en œuvre, le procédé comprend en outre une étape de tirage à vide de l’air disposé entre la deuxième face et le plot central au moyen d’une pompe à vide reliée à un orifice central débouchant dans une zone centrale du plot, de sorte à retenir la deuxième face du récipient sur le plot central. Selon une mise en œuvre, le procédé comprend en outre une étape de tirage à vide de l’air disposé entre la première face et l’empreinte au moyen d’un système de tirage à vide de sorte à faciliter l’injection du matériau comprenant du silicone dans l’empreinte. According to one implementation, the method further comprises a step of drawing a vacuum from the air disposed between the second face and the central pad by means of a vacuum pump connected to a central orifice opening into a central zone of the pad, so as to retain the second face of the container on the central pad. According to one implementation, the method further comprises a step of vacuum drawing the air disposed between the first face and the imprint by means of a vacuum drawing system so as to facilitate the injection of the material comprising silicone into the imprint.

Selon une mise en œuvre, le procédé comprend, avant ou durant l’étape d’ouverture du moule une étape d’éloignement entre la première face du récipient et la partie femelle, mise en œuvre par actionnement de poussoirs disposés dans l’empreinte de la partie femelle. According to one implementation, the method comprises, before or during the mold opening step, a step of separation between the first face of the container and the female part, implemented by actuating pushers arranged in the imprint of the female part.

Selon une mise en œuvre du procédé, le récipient de vaisselle est un récipient en verre trempé. According to one implementation of the method, the dishware container is a tempered glass container.

Selon une mise en œuvre du procédé, le récipient est une assiette ou un ramequin. According to one implementation of the method, the container is a plate or a ramekin.

DESCRIPTION DES FIGURES DESCRIPTION OF FIGURES

D’autres caractéristiques, buts et avantages ressortiront de la description qui suit, qui est purement illustrative et non limitative, et qui doit être lue en regard des dessins annexés sur lesquels : Other features, aims and advantages will emerge from the following description, which is purely illustrative and not limiting, and which must be read in conjunction with the attached drawings in which:

- la figure 1 illustre schématiquement un récipient de vaisselle obtenu par un procédé de surmoulage tel que proposé - figure 1 schematically illustrates a tableware container obtained by an overmolding process as proposed

- la figure 2 illustre schématiquement un moule tel que proposé ; - figure 2 schematically illustrates a mold as proposed;

- la figure 3 illustre schématiquement un procédé de surmoulage d’un récipient de vaisselle tel que proposé. - Figure 3 schematically illustrates a process for overmolding a tableware container as proposed.

DESCRIPTION DÉTAILLÉE DE MODES DE RÉALISATION DETAILED DESCRIPTION OF EMBODIMENTS

Selon un premier aspect, il est proposé un moule de surmoulage par injection. En référence à la figure 1 , qui représente un récipient de vaisselle générique, un tel récipient 20 comprend une première face 21 destinée à reposer sur une table ou un plateau et une deuxième face 22 recevant la nourriture placée sur ou dans le récipient. Le récipient 20 comprend en outre des bords 23, s’étendant circonférentiellement autour d’une partie centrale 24. Les bords 23 peuvent s’étendre parallèlement à la partie centrale 24, pour une assiette plate, ou présenter un angle plus ou moins important avec cette partie centrale 24. Il est également possible que la partie centrale 24 et/ou les bords 23 soient au moins en partie curvilignes, par exemple dans le cas d’un bol ou d’un ramequin. According to a first aspect, an injection overmolding mold is provided. With reference to FIG. 1 , which shows a generic tableware container, such a container 20 comprises a first face 21 intended to rest on a table or tray and a second face 22 receiving the food placed on or in the container. The container 20 further comprises edges 23, extending circumferentially around a central portion 24. The edges 23 may extend parallel to the central portion 24, for a flat plate, or have a more or less significant angle with this central portion 24. It is also possible for the central portion 24 and/or the edges 23 to be at least partly curvilinear, for example in the case of a bowl or a ramekin.

Le moule 10 proposé est représenté à la figure 2. Il comprend une partie mâle 11 et une partie femelle 12. La partie femelle 12 est munie d’une empreinte 13 configurée pour recevoir, en utilisation, la première face 21 du récipient de vaisselle 20, tandis que la partie mâle 1 1 est munie d’un plot central 1 configuré pour recevoir la deuxième face 22 du récipient 20. The proposed mold 10 is shown in Figure 2. It comprises a male part 11 and a female part 12. The female part 12 is provided with an imprint 13 configured to receive, in use, the first face 21 of the dish container 20, while the male part 11 is provided with a central stud 1 configured to receive the second face 22 of the container 20.

On définit un axe principal X du moule comme étant un axe perpendiculaire aux plans formés d’une part par la surface de la partie femelle 12 sur laquelle est disposée l’empreinte 13, et d’autre part par la surface de la partie mâle 1 1 sur laquelle repose le plot 1. L’axe principal X passe en outre par les centres respectifs de l’empreinte 13 et du plot 1. Ledit axe principal définit également la direction d’ouverture-fermeture du moule. A main axis X of the mold is defined as being an axis perpendicular to the planes formed on the one hand by the surface of the female part 12 on which the imprint 13 is arranged, and on the other hand by the surface of the male part 11 on which the stud 1 rests. The main axis X also passes through the respective centers of the imprint 13 and the stud 1. Said main axis also defines the opening-closing direction of the mold.

Naturellement, les formes de l’empreinte et du plot doivent être adaptées à la géométrie du récipient 20 que l’on souhaite surmouler. À cet effet, lorsqu’il est nécessaire de surmouler différentes géométries de récipient, plusieurs moules 10 distincts peuvent être utilisés. Naturally, the shapes of the imprint and the stud must be adapted to the geometry of the container 20 that it is desired to overmold. For this purpose, when it is necessary to overmold different container geometries, several separate molds 10 can be used.

La partie femelle 12 comprend une buse d’injection 9 grâce à laquelle un matériau comprenant du silicone peut être injecté dans l’empreinte 13, afin de recouvrir la première face 21 avec ledit matériau. La buse 10 est préférentiellement disposée au milieu de l’empreinte 13, mais peut être disposée selon d’autres positions lui permettant de déboucher dans l’empreinte 13. The female part 12 comprises an injection nozzle 9 by means of which a material comprising silicone can be injected into the imprint 13, in order to cover the first face 21 with said material. The nozzle 10 is preferably arranged in the middle of the imprint 13, but can be arranged in other positions allowing it to open into the imprint 13.

Le plot central 1 de la partie mâle 11 doit être formé d’un matériau souple, et ayant un coefficient de frottement suffisamment faible pour permettre un déplacement du récipient 20. Par souple, on entend un matériau avec une dureté Shore D comprise entre 50 et 60. Alternativement, le plot central 1 peut être formé d’un matériau plus dur, mais recouvert d’un revêtement à coefficient de frottement suffisamment faible pour permettre un déplacement du récipient 20, et présentant une dureté Shore D entre 50 et 60. De par ces propriétés mécaniques, la surface du plot central 1 peut recevoir la deuxième face 22 du récipient 20 de façon à permettre un déplacement du récipient 20 perpendiculairement à l’axe principal X du moule 10. Ainsi, le récipient 20 prend naturellement la position dans laquelle les efforts dus à la pression d’injection sont répartis sur sa surface, et on minimise le risque de voir se développer des efforts localement concentrés susceptibles d’endommager le récipient 20. The central stud 1 of the male part 11 must be formed of a flexible material, and having a sufficiently low coefficient of friction to allow movement of the container 20. By flexible, we mean a material with a Shore D hardness of between 50 and 60. Alternatively, the central stud 1 can be formed of a harder material, but covered with a coating with a sufficiently low coefficient of friction to allow movement of the container 20, and having a Shore D hardness of between 50 and 60. Due to these mechanical properties, the surface of the central stud 1 can receive the second face 22 of the container 20 so as to allow movement of the container 20 perpendicular to the main axis X of the mold 10. Thus, the container 20 naturally takes the position in which the forces due to the injection pressure are distributed over its surface, and the risk of locally concentrated forces developing that could damage the container 20 is minimized.

Le moule 10 est particulièrement adapté au surmoulage de récipients 20 en verre trempé, qui présentent des irrégularités de dimension selon les trois axes, pour les raisons citées précédemment. The mold 10 is particularly suitable for overmolding tempered glass containers 20, which have dimensional irregularities along the three axes, for the reasons cited above.

Selon un mode de réalisation, le plot central 1 comprend un matériau présentant des propriétés antiadhésives, notamment du polytétrafluoroéthylène - connu sous la marque commerciale Teflon®. Le plot central 1 peut également être constitué d’un autre matériau recouvert d’un revêtement antiadhésif. Sur la surface de la partie mâle 11 accueillant le plot 1 , un joint périphérique 3 s’étend selon un cercle centré sur l’axe principal X, de sorte à se trouver à une distance de l’axe principal X supérieure à celle correspondant à la circonférence du plot 1. Ce joint périphérique a pour fonction de servir d’appui aux bords 23 du récipient de vaisselle 20 lorsque celui-ci est disposé dans le moule 10. Comme le plot 1 , le joint 3 est formé d’un matériau souple, dont la dureté Shore A est comprise entre 50 et 60. De manière similaire au plot 1 , la souplesse du joint 3 périphérique permet un déplacement des bords 23 du récipient 20 durant le surmoulage de façon à assurer une répartition la meilleure possible des efforts sur la surface du récipient 20. According to one embodiment, the central pad 1 comprises a material having non-stick properties, in particular polytetrafluoroethylene - known under the trademark Teflon®. The central pad 1 may also be made of another material covered with a non-stick coating. On the surface of the male part 11 receiving the stud 1, a peripheral seal 3 extends in a circle centered on the main axis X, so as to be at a distance from the main axis X greater than that corresponding to the circumference of the stud 1. This peripheral seal has the function of serving as a support for the edges 23 of the dishware container 20 when the latter is placed in the mold 10. Like the stud 1, the seal 3 is formed of a flexible material, the Shore A hardness of which is between 50 and 60. In a manner similar to the stud 1, the flexibility of the peripheral seal 3 allows the edges 23 of the container 20 to move during overmolding so as to ensure the best possible distribution of the forces on the surface of the container 20.

Selon un mode de réalisation, le joint périphérique 3 comprend un matériau présentant des propriétés antiadhésives, notamment du polytétrafluoroéthylène - connu sous la marque commerciale Teflon®. Le joint périphérique 3 peut également être constitué d’un autre matériau recouvert d’un revêtement antiadhésif. Cette caractéristique présente l’avantage d’éviter que les bords 23 du récipient n’adhèrent au joint périphérique 3, et donc de faciliter le retrait du récipient 20 par rapport au moule 10 après surmoulage. According to one embodiment, the peripheral seal 3 comprises a material having non-stick properties, in particular polytetrafluoroethylene - known under the trademark Teflon®. The peripheral seal 3 may also be made of another material covered with a non-stick coating. This feature has the advantage of preventing the edges 23 of the container from adhering to the peripheral seal 3, and therefore of facilitating the removal of the container 20 from the mold 10 after overmolding.

Entre le plot 1 et le joint 3, la surface de la partie mâle 11 forme une cavité de conformation 2, c’est-à-dire que la partie des bords 23 du récipient 20 située entre le plot 1 et le joint 3 périphérique selon une direction perpendiculaire à l’axe principal X ne repose pas directement sur la partie mâle 1 1 , la cavité de conformation 2 étant située entre cette partie des bords 23 et la surface de la partie mâle 1 1 . La cavité de conformation 2 contribue ainsi, conjointement avec le joint 3 périphérique et le plot 1 , à permettre un déplacement du récipient 20 pendant le surmoulage. Between the stud 1 and the seal 3, the surface of the male part 11 forms a shaping cavity 2, that is to say that the part of the edges 23 of the container 20 located between the stud 1 and the peripheral seal 3 in a direction perpendicular to the main axis X does not rest directly on the male part 11, the shaping cavity 2 being located between this part of the edges 23 and the surface of the male part 11. The shaping cavity 2 thus contributes, together with the peripheral seal 3 and the stud 1, to allowing movement of the container 20 during overmolding.

Le joint périphérique 3 et/ou la cavité de conformation 2 peuvent être adaptés pour permettre un déplacement des bords 23 inférieur à 3 millimètres, de préférence compris entre 1 et 3 millimètres, et de manière encore plus préférentielle compris entre 1 et 2 millimètres. The peripheral seal 3 and/or the shaping cavity 2 can be adapted to allow a displacement of the edges 23 of less than 3 millimeters, preferably between 1 and 3 millimeters, and even more preferably between 1 and 2 millimeters.

Le moule 10 comprend un système de fermeture apte à déplacer la partie mâle 11 et la partie femelle 12 l’une par rapport à l’autre. Le système de fermeture peut être apte à déplacer la partie mâle 11 et/ou la partie femelle 12. Le système de fermeture peut notamment comprendre des vérins, tels que des vérins hydrauliques ou pneumatiques. Le moule 10 peut être un moule à presse horizontale, c’est-à-dire comprenant des vérins disposés horizontalement, les surfaces des parties mâle 11 et femelle 12 s’étendant alors selon un plan vertical, ou un moule à presse verticale avec des vérins disposés verticalement, les surfaces des parties mâle 11 et femelle 12 s’étendant alors selon un plan horizontal. The mold 10 comprises a closing system capable of moving the male part 11 and the female part 12 relative to each other. The closing system may be capable of moving the male part 11 and/or the female part 12. The closing system may in particular comprise jacks, such as hydraulic or pneumatic jacks. The mold 10 may be a horizontal press mold, i.e. comprising jacks arranged horizontally, the surfaces of the male 11 and female 12 parts then extending along a vertical plane, or a vertical press mold with jacks arranged vertically, the surfaces of the male 11 and female 12 parts then extending along a horizontal plane.

Le moule 10 peut, selon un mode de réalisation particulier, comprendre une pompe à vide 5 afin de retenir la deuxième face 22 du récipient 20 sur le plot central 1 par aspiration, une fois l’assiette positionnée dans le moule 10. Cette pompe à vide 5 est particulièrement adaptée lorsque le moule 10 est du type à presse horizontale, car les faces 21 , 22 du récipient sont alors disposées selon un plan vertical une fois placées dans le moule, et qu’il est donc nécessaire de s’assurer que le récipient 20 soit plaqué contre le plot 1 lorsque le moule 10 ne se trouve pas en position intégralement fermée. Cependant, on peut prévoir une telle pompe à vide 5 également lorsque le moule 10 est du type à presse verticale. The mold 10 may, according to a particular embodiment, comprise a vacuum pump 5 in order to retain the second face 22 of the container 20 on the central pad 1 by suction, once the plate is positioned in the mold 10. This vacuum pump 5 is particularly suitable when the mold 10 is of the horizontal press type, because the faces 21, 22 of the container are then arranged in a vertical plane once placed in the mold, and it is therefore necessary to ensure that the container 20 is pressed against the stud 1 when the mold 10 is not in the fully closed position. However, such a vacuum pump 5 can also be provided when the mold 10 is of the vertical press type.

La pompe à vide 5 est reliée à un orifice 7 débouchant dans le plot 1 , préférentiellement au centre de celui-ci. Lorsque la pompe à vide 5 est placée à distance du plot 1 , un conduit 6 peut être prévu pour relier la pompe 5 à l’orifice 7. The vacuum pump 5 is connected to an orifice 7 opening into the pad 1, preferably in the center thereof. When the vacuum pump 5 is placed at a distance from the pad 1, a conduit 6 may be provided to connect the pump 5 to the orifice 7.

Un autre mode de réalisation prévu pour assurer le plaquage de la deuxième face 22 du récipient sur le plot central 1 comprend un joint d’appui 15 disposé sur le plot central. Le joint d’appui 15 est un joint circulaire, centré sur l’axe principal X et disposé sur la surface du plot central 1 . Ce joint présente des propriétés adhésives permettant de s’assurer du maintien de la deuxième face 22 sur le plot central 1 , y compris lorsque le moule 10 est du type à presse horizontale. Another embodiment provided for ensuring the plating of the second face 22 of the container on the central pad 1 comprises a support seal 15 arranged on the central pad. The support seal 15 is a circular seal, centered on the main axis X and arranged on the surface of the central pad 1. This seal has adhesive properties making it possible to ensure the maintenance of the second face 22 on the central pad 1, including when the mold 10 is of the horizontal press type.

On peut éventuellement combiner les deux modes de réalisation précédemment cités et prévoir un plot central 1 comprenant un orifice 7 relié à une pompe à vide 5, ainsi qu’un joint d’appui 15. It is possible to combine the two embodiments mentioned above and provide a central block 1 comprising an orifice 7 connected to a vacuum pump 5, as well as a support seal 15.

Le moule 10 peut comprendre un système de tirage à vide 4. Un tel système débouche dans la partie femelle 12 soit directement en regard de la première face 21 du récipient 20 lorsque celui-ci est placé dans le moule 10, soit en regard de la partie mâle 11 . Le système de tirage à vide 4 permet de diminuer la pression de l’air situé entre le récipient 20 et la partie femelle 12, facilitant ainsi l’injection de silicone par la buse 9. The mold 10 may comprise a vacuum system 4. Such a system opens into the female part 12 either directly opposite the first face 21 of the container 20 when the latter is placed in the mold 10, or opposite the male part 11. The vacuum system 4 makes it possible to reduce the pressure of the air located between the container 20 and the female part 12, thus facilitating the injection of silicone through the nozzle 9.

Lorsque la face inférieure 21 du récipient 20 présente une surface importante, il existe un risque que le matériau injecté n’adhère pas uniquement au récipient 20, mais également à l’empreinte 13 ou à la partie femelle 12. L’application de substances chimiques ou d’eau savonneuse peut permettre de décoller le matériau injecté de l’empreinte 13 ou de la partie femelle 12, avec toutefois des résultats mitigés. À cet effet, le moule comprend selon un mode de réalisation un ou plusieurs poussoir(s) 14 disposés dans l’empreinte 13 et aptes à éloigner le récipient 20 de l’empreinte 13. Il peut s’agit d’une pluralité de poussoirs 14 ou d’un unique poussoir circulaire, centré sur l’axe principal X et s’étendant sur toute la circonférence de l’empreinte 13. Ainsi, on s’affranchit du besoin d’utiliser des produits particuliers pour décoller le matériau, réduisant les coûts d’opération du moule. En outre, ce mode de réalisation présente l’avantage d’être aisément automatisable - il suffit de prévoir un actionnement du ou des poussoir(s) 14 lorsqu’il est nécessaire de séparer le récipient 20 du moule 10 - et est donc adapté à un usage à échelle industrielle. Il est en outre proposé un procédé 100 de surmoulage d’un récipient de vaisselle 20 avec un matériau comprenant du silicone, dans un moule 10 tel que décrit précédemment. En référence à la figure 3, le procédé comprend, dans son mode de réalisation le plus général, une étape de positionnement 101 du récipient 20 dans le moule 10, la deuxième face 22 du récipient 20 étant placé sur le plot central 1 , le joint périphérique 3 recevant les bords 23 du récipient 20. Après positionnement du récipient 20, une étape de fermeture 102 est mise en œuvre, selon laquelle on amène la partie femelle 12 en regard de la partie mâle 1 1 en actionnant le système de fermeture du moule 10. Le récipient est alors retenu entre les parties mâle et femelle 11 , 12 et ne se déplace pas tant que l’injection de matériau n’a pas débuté. S’ensuit une étape d’injection 105 du matériau comprenant du silicone, préférentiellement une gomme de silicone liquide, par la buse d’injection 9 disposée dans la partie femelle 12 de façon à recouvrir l’intégralité de la première face 21 du matériau injecté. Pendant l’étape d’injection, le récipient 20 sera libre d’adopter une position qui réduit les efforts locaux, du fait des caractéristiques particulières du moule 10 décrites ci-avant. Enfin, une étape d’ouverture 107 du moule est mise en œuvre, permettant le retrait du récipient 20 par rapport au moule 10. When the lower face 21 of the container 20 has a large surface area, there is a risk that the injected material will not adhere only to the container 20, but also to the imprint 13 or the female part 12. The application of chemicals or soapy water can make it possible to detach the injected material from the imprint 13 or the female part 12, although with mixed results. For this purpose, the mold comprises, according to one embodiment, one or more pushers 14 arranged in the imprint 13 and capable of moving the container 20 away from the imprint 13. This may be a plurality of pushers 14 or a single circular pusher, centered on the main axis X and extending over the entire circumference of the imprint 13. This eliminates the need to use special products to detach the material, reducing the operating costs of the mold. Furthermore, this embodiment has the advantage of being easily automatable - it is sufficient to provide for actuation of the pusher(s) 14 when it is necessary to separate the container 20 from the mold 10 - and is therefore suitable for use on an industrial scale. There is further provided a method 100 for overmolding a dishware container 20 with a material comprising silicone, in a mold 10 as described above. With reference to FIG. 3, the method comprises, in its most general embodiment, a step 101 of positioning the container 20 in the mold 10, the second face 22 of the container 20 being placed on the central stud 1, the peripheral seal 3 receiving the edges 23 of the container 20. After positioning the container 20, a closing step 102 is implemented, according to which the female part 12 is brought opposite the male part 11 by actuating the closing system of the mold 10. The container is then retained between the male and female parts 11, 12 and does not move until the injection of material has begun. This is followed by an injection step 105 of the material comprising silicone, preferably a liquid silicone rubber, through the injection nozzle 9 arranged in the female part 12 so as to cover the entire first face 21 of the injected material. During the injection step, the container 20 will be free to adopt a position which reduces the local forces, due to the particular characteristics of the mold 10 described above. Finally, a mold opening step 107 is implemented, allowing the container 20 to be removed from the mold 10.

Suite à l’étape de positionnement 101 , Il n’est pas nécessaire que les bords 23 du récipient 20 atteignent, sur toute la circonférence de celui-ci, l’extrémité du joint périphérique 3 la plus éloignée de l’axe principal X. Du fait de la variabilité de dimension du récipient, il se peut que les bords 23 n’atteignent pas la même position du joint périphérique 3 sur toute la circonférence du récipient 20. Il sera alors possible d’injecter une couche plus épaisse de matériau aux positions circonférentielles où le récipient 20 présente un diamètre réduit, de sorte à obtenir un récipient surmoulé de diamètre sensiblement homogène après mise en œuvre du procédé de surmoulage 100. Following the positioning step 101, it is not necessary for the edges 23 of the container 20 to reach, over the entire circumference thereof, the end of the peripheral seal 3 furthest from the main axis X. Due to the variability in the size of the container, it is possible that the edges 23 do not reach the same position of the peripheral seal 3 over the entire circumference of the container 20. It will then be possible to inject a thicker layer of material at the circumferential positions where the container 20 has a reduced diameter, so as to obtain an overmolded container of substantially uniform diameter after implementing the overmolding method 100.

Le type de matériau injecté par le biais de la buse 9 d’injection a une incidence directe sur la qualité du récipient 20 surmoulé obtenu. Selon un mode de réalisation, le matériau injecté pendant l’étape d’injection 105 est une gomme de silicone liquide présentant des propriétés autoadhésives. On s’assure ainsi d’obtenir un récipient de vaisselle 20 présentant une cohésion moléculaire satisfaisante entre le silicone injecté et le matériau dont le récipient 20, avant mise en œuvre du procédé de surmoulage 100, est constitué. The type of material injected through the injection nozzle 9 has a direct impact on the quality of the overmolded container 20 obtained. According to one embodiment, the material injected during the injection step 105 is a liquid silicone gum having self-adhesive properties. This ensures that a tableware container 20 having satisfactory molecular cohesion between the injected silicone and the material of which the container 20, before implementation of the overmolding method 100, is made.

Selon une mise en œuvre du procédé, lorsque la partie mâle 11 du moule 10 comprend une pompe à vide 5, une étape de tirage à vide 103 est réalisée avant l’étape d’injection 105 de sorte à retenir la deuxième face 22 du récipient 20 sur le plot central 1 , soit après fermeture 102 du moule 10, soit directement après positionnement 101 du récipient 20 sur le plot central 1 , notamment lorsque le moule 10 est du type à presse horizontale et que le récipient 20 ne pourrait pas tenir sur le plot central 1 en l’absence d’un tirage à vide. Selon une autre mise en œuvre du procédé, lorsque la partie femelle 12 comprend un système de tirage à vide 4, le procédé peut comprendre une étape de tirage à vide 104 de l’air disposé entre la première face 21 et l’empreinte 13 au moyen du système de tirage à vide 4, de sorte à réduire au maximum la pression entre la première face 21 et l’empreinte 13 et de faciliter le mouvement du matériau injecté, qui vient recouvrir la première surface 21 . On peut ainsi réduire le temps nécessaire à l’étape d’injection 105 et éviter une réticulation prématurée du matériau injecté. L’étape de tirage à vide 104 par le système de tirage à vide 4 est réalisée après l’étape de fermeture 102 du moule, et avant ou après une étape éventuelle de tirage à vide 103 par la pompe à vide 5. Selon une mise en œuvre du procédé, une étape d’éloignement 106 de la première face 21 du récipient 20 par rapport à la partie femelle 12 est mise en œuvre soit après l’étape d’ouverture 107, soit éventuellement pendant l’ouverture 107 du moule 10. L’éloignement 6 est réalisé par actionnement des poussoirs 14 disposés dans l’empreinte 13 de la partie femelle 12. According to one implementation of the method, when the male part 11 of the mold 10 comprises a vacuum pump 5, a vacuum drawing step 103 is carried out before the injection step 105 so as to retain the second face 22 of the container 20 on the central stud 1, either after closing 102 of the mold 10, or directly after positioning 101 of the container 20 on the central stud 1, in particular when the mold 10 is of the horizontal press type and the container 20 could not hold on the central stud 1 in the absence of a vacuum drawing. According to another implementation of the method, when the female part 12 comprises a vacuum drawing system 4, the method can comprise a step of vacuum drawing 104 of the air arranged between the first face 21 and the imprint 13 by means of the vacuum drawing system 4, so as to reduce as much as possible the pressure between the first face 21 and the imprint 13 and to facilitate the movement of the injected material, which covers the first surface 21. It is thus possible to reduce the time required for the injection step 105 and to avoid premature crosslinking of the injected material. The vacuum drawing step 104 by the vacuum drawing system 4 is carried out after the mold closing step 102, and before or after a possible vacuum drawing step 103 by the vacuum pump 5. According to one implementation of the method, a step 106 of moving the first face 21 of the container 20 away from the female part 12 is implemented either after the opening step 107, or possibly during the opening 107 of the mold 10. The moving away 6 is carried out by actuating the pushers 14 arranged in the imprint 13 of the female part 12.

Claims

REVENDICATIONS 1. Moule (10) de surmoulage par injection d’un récipient de vaisselle (20) avec un matériau comprenant du silicone, le moule (10) comprenant une partie femelle (12) et une partie mâle (11 ), la partie femelle (12) comprenant : o une empreinte (13) configurée pour accueillir une première face (21 ) du récipient de vaisselle durant le surmoulage, o une buse d’injection (9) configurée pour permettre l’injection du matériau comprenant du silicone dans l’empreinte (13) sur la première face (21 ), la partie mâle comprenant : o un plot central (1 ) formé d’un matériau présentant une dureté Shore D comprise entre 50 et 60 ou comprenant un revêtement en matériau présentant une dureté Shore D comprise entre 50 et 60, configuré pour recevoir une deuxième face (22) du récipient de vaisselle, o un joint périphérique (3) formé d’un matériau présentant une dureté Shore A comprise entre 50 et 60, et configuré pour recevoir des bords (23) du récipient de vaisselle (20), le joint périphérique s’étendant circonférentiellement autour du plot central, o une cavité de conformation (2) s’étendant circonférentiellement entre le plot central (1 ) et le joint périphérique (3), la cavité de conformation (2) et le joint périphérique (3) étant adaptés pour permettre un déplacement des bords (23) durant le surmoulage. 1. Mold (10) for injection overmolding a dishware container (20) with a material comprising silicone, the mold (10) comprising a female part (12) and a male part (11), the female part (12) comprising: o an imprint (13) configured to accommodate a first face (21) of the dishware container during overmolding, o an injection nozzle (9) configured to allow the injection of the material comprising silicone into the imprint (13) on the first face (21), the male part comprising: o a central stud (1) formed from a material having a Shore D hardness of between 50 and 60 or comprising a coating made of a material having a Shore D hardness of between 50 and 60, configured to receive a second face (22) of the dishware container, o a peripheral seal (3) formed from a material having a Shore A hardness of between 50 and 60, and configured to receive edges (23) of the dishware container (20), the peripheral seal extending circumferentially around the central stud, o a shaping cavity (2) extending circumferentially between the central stud (1) and the peripheral seal (3), the shaping cavity (2) and the peripheral seal (3) being adapted to allow movement of the edges (23) during overmolding. 2. Moule (10) selon la revendication précédente, comprenant une pompe à vide (5) reliée à un orifice central (7) débouchant dans une zone centrale du plot (1 ) de sorte à retenir la deuxième face (22) sur le plot central (1 ) par aspiration. 2. Mold (10) according to the preceding claim, comprising a vacuum pump (5) connected to a central orifice (7) opening into a central zone of the pad (1) so as to retain the second face (22) on the central pad (1) by suction. 3. Moule (10) selon l’une quelconque des revendications précédentes, comprenant un système de tirage à vide (4) débouchant dans la partie femelle (12) en regard de la première face (21 ) ou en regard de la partie mâle (1 1 ). 3. Mold (10) according to any one of the preceding claims, comprising a vacuum drawing system (4) opening into the female part (12) opposite the first face (21) or opposite the male part (11). 4. Moule (10) selon l’une quelconque des revendications précédentes, le joint périphérique (3) et/ou le plot central (1 ) comprenant un matériau présentant des propriétés anti-adhésives, notamment du polytétrafluoroéthylène, ou étant recouvert(s) d’un revêtement comprenant un matériau présentant des propriétés anti-adhésives, notamment du polytétrafluoroéthylène. 4. Mold (10) according to any one of the preceding claims, the peripheral seal (3) and/or the central stud (1) comprising a material having non-stick properties, in particular polytetrafluoroethylene, or being covered with a coating comprising a material having non-stick properties, in particular polytetrafluoroethylene. 5. Moule (10) selon l’une quelconque des revendications précédentes, le joint périphérique (3) et/ou la cavité de conformation (2) étant adaptés pour permettre un déplacement des bords (23) inférieur à 3 millimètres, de préférence compris entre 1 et 3 millimètres, encore préférentiellement compris entre 1 et 2 millimètres. 5. Mold (10) according to any one of the preceding claims, the peripheral seal (3) and/or the shaping cavity (2) being adapted to allow a displacement of the edges (23) of less than 3 millimeters, preferably between 1 and 3 millimeters, more preferably between 1 and 2 millimeters. 6. Moule (10) selon l’une quelconque des revendications précédentes, comprenant au moins un poussoir (14) disposé dans l’empreinte (13) de la partie femelle (12) et apte à éloigner le récipient de l’empreinte (13) en poussant sur la première face (21 ).6. Mold (10) according to any one of the preceding claims, comprising at least one pusher (14) arranged in the imprint (13) of the female part (12) and capable of moving the container away from the imprint (13) by pushing on the first face (21). 7. Moule (10) selon la revendication précédente, ledit au moins un poussoir (14) s’étendant sur toute la circonférence de l’empreinte (13). 7. Mold (10) according to the preceding claim, said at least one pusher (14) extending over the entire circumference of the imprint (13). 8. Procédé (100) de surmoulage d’un récipient de vaisselle (20) avec un matériau comprenant du silicone, comprenant les étapes de : a. positionner (101 ) le récipient (20) dans un moule (10) selon l’une quelconque des revendications précédentes, une deuxième face (22) du récipient étant placée sur le plot central (1 ) et des bords (23) du récipient étant reçues sur le joint périphérique (3), b. fermer (102) le moule (10) en amenant la partie femelle (12) en regard de la partie mâle (1 1 ) de sorte à retenir le récipient (20) entre la partie femelle (12) et la partie mâle (11 ) c. injecter (105) le matériau comprenant du silicone par la buse d’injection (9) jusqu’à ce que la première face (21 ) soit recouverte dudit matériau, d. ouvrir (107) le moule (10) et en retirer le récipient (20). 8. A method (100) for overmolding a dishware container (20) with a material comprising silicone, comprising the steps of: a. positioning (101) the container (20) in a mold (10) according to any one of the preceding claims, a second face (22) of the container being placed on the central stud (1) and edges (23) of the container being received on the peripheral seal (3), b. closing (102) the mold (10) by bringing the female part (12) opposite the male part (11) so as to retain the container (20) between the female part (12) and the male part (11), c. injecting (105) the material comprising silicone through the injection nozzle (9) until the first face (21) is covered with said material, d. opening (107) the mold (10) and removing the container (20) therefrom. 9. Procédé de surmoulage selon la revendication 8, comprenant en outre une étape de tirage à vide (103) de l’air disposé entre la deuxième face (22) et le plot central (1 ) au moyen d’une pompe à vide (5) reliée à un orifice central (7) débouchant dans une zone centrale du plot (1 ), de sorte à retenir la deuxième face (22) du récipient sur le plot central (1 ). 9. Overmolding method according to claim 8, further comprising a step of drawing a vacuum (103) from the air disposed between the second face (22) and the central pad (1) by means of a vacuum pump (5) connected to a central orifice (7) opening into a central zone of the pad (1), so as to retain the second face (22) of the container on the central pad (1). 10. Procédé de surmoulage selon l’une quelconque des revendications 8 ou 9, comprenant en outre une étape de tirage à vide (104) de l’air disposé entre la première face (21 ) et l’empreinte (13) au moyen d’un système de tirage à vide (4) de sorte à faciliter l’injection (105) du matériau comprenant du silicone dans l’empreinte (13). 10. Overmolding method according to any one of claims 8 or 9, further comprising a step of vacuum drawing (104) of the air disposed between the first face (21) and the imprint (13) by means of a vacuum drawing system (4) so as to facilitate the injection (105) of the material comprising silicone into the imprint (13). 11 . Procédé de surmoulage selon l’une quelconque des revendications 8 à 10, comprenant avant ou durant l’étape d’ouverture (107) du moule une étape d’éloignement (106) entre la première face (21 ) du récipient et la partie femelle (12), mise en œuvre par actionnement de poussoirs (14) disposés dans l’empreinte (13) de la partie femelle (12). 11. Overmolding method according to any one of claims 8 to 10, comprising before or during the step of opening (107) the mold a step of distancing (106) between the first face (21) of the container and the female part (12), implemented by actuation of pushers (14) arranged in the imprint (13) of the female part (12). 12. Procédé de surmoulage selon l’une quelconque des revendications 8 à 1 1 , le récipient de vaisselle (20) étant un récipient en verre trempé. 12. Overmolding method according to any one of claims 8 to 11, the dishware container (20) being a tempered glass container. 13. Procédé de surmoulage selon l’une quelconque des revendications 8 à 12, le récipient étant une assiette ou un ramequin. 13. Overmolding method according to any one of claims 8 to 12, the container being a plate or a ramekin.
PCT/EP2024/063741 2023-05-19 2024-05-17 Mould and method for overmoulding a tableware receptacle Pending WO2024240665A1 (en)

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FR2304977A FR3148735B1 (en) 2023-05-19 2023-05-19 MOLD AND METHOD FOR OVERMOLDING A DISHWARE CONTAINER

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DE202015101605U1 (en) * 2015-03-30 2015-04-14 Webasto SE Device for molding a mold section onto a plate-like workpiece with a sealing profile for a vacuum chamber
DE102014019661A1 (en) * 2014-12-20 2016-06-23 Leopold Kostal Gmbh & Co. Kg Method for injection molding a three-dimensionally shaped component

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
DE102014019661A1 (en) * 2014-12-20 2016-06-23 Leopold Kostal Gmbh & Co. Kg Method for injection molding a three-dimensionally shaped component
DE202015101605U1 (en) * 2015-03-30 2015-04-14 Webasto SE Device for molding a mold section onto a plate-like workpiece with a sealing profile for a vacuum chamber

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FR3148735B1 (en) 2025-05-23

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