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WO2000073038A1 - Procede et dispositif permettant de fabriquer des articles moules en plastique, possedant au moins deux couches - Google Patents

Procede et dispositif permettant de fabriquer des articles moules en plastique, possedant au moins deux couches Download PDF

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Publication number
WO2000073038A1
WO2000073038A1 PCT/CH2000/000272 CH0000272W WO0073038A1 WO 2000073038 A1 WO2000073038 A1 WO 2000073038A1 CH 0000272 W CH0000272 W CH 0000272W WO 0073038 A1 WO0073038 A1 WO 0073038A1
Authority
WO
WIPO (PCT)
Prior art keywords
film
injection
mold
die
injection mold
Prior art date
Application number
PCT/CH2000/000272
Other languages
German (de)
English (en)
Inventor
Heinz Kaufmann
Original Assignee
Packtech Limited
Pro Finanz Ag
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 Packtech Limited, Pro Finanz Ag filed Critical Packtech Limited
Priority to AU43890/00A priority Critical patent/AU4389000A/en
Publication of WO2000073038A1 publication Critical patent/WO2000073038A1/fr

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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
    • B29C45/1418—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 inserts being deformed or preformed, e.g. by the injection pressure
    • 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
    • B29C45/1418—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 inserts being deformed or preformed, e.g. by the injection pressure
    • B29C2045/14188—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 inserts being deformed or preformed, e.g. by the injection pressure trimming the article 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
    • B29C45/1418—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 inserts being deformed or preformed, e.g. by the injection pressure
    • B29C2045/14213—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 inserts being deformed or preformed, e.g. by the injection pressure deforming by gas or fluid pressure in the mould cavity
    • 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
    • B29C45/1418—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 inserts being deformed or preformed, e.g. by the injection pressure
    • B29C2045/14286—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 inserts being deformed or preformed, e.g. by the injection pressure means for heating the insert
    • 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
    • B29C45/14311—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 using means for bonding the coating to the articles
    • B29C2045/14319—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 using means for bonding the coating to the articles bonding by a fusion bond
    • 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
    • B29L2023/00—Tubular articles
    • B29L2023/20—Flexible squeeze tubes, e.g. for cosmetics

Definitions

  • the invention relates to a method for producing at least two-layer molded bodies made of plastics according to the preamble of claim 1, a device for carrying out the method according to the preamble of claim 14 and molded bodies produced according to the method according to the preamble of claim 23.
  • plastics In the field of packaging, plastics have found widespread use as packaging materials. This is not least due to the fact that, compared to metals, plastics are easier to form for packaging with a special design. Compared to metals as packaging materials, however, plastics of the same purpose have product-specific disadvantages, with which containers or parts thereof made from them also suffer. With most plastics, there are also disadvantages. For example, polyethylene (PE) and polypropylene (PP) have satisfactory strengths in the processed state, their gas permeability, in particular oxygen permeability, being relatively high, which shortens the storage life of packaged goods that are packaged in these plastics and are sensitive to oxidation. Conversely, plastics with good gas impermeability have insufficient strength for packaging purposes.
  • PE polyethylene
  • PP polypropylene
  • laminates which combine the desired properties.
  • a packaging film a film made of plastic of high strength but high gas permeability is combined with such low strength but low gas permeability, as a result of which the laminate is characterized by high strength and low gas permeability. characterizes.
  • the optimization of a packaging material, as outlined above, is not limited to strength and gas permeability, in addition there are heat resistance, weldability, water absorption, oxidation behavior compared to the packaged goods etc.
  • manufacturing processes have been developed which produce even multilayered laminates with great efficiency which as such can be reworked into desired products, such as packaging.
  • Rigid-walled parts are understood to mean parts made of plastics which are characterized by wall thicknesses which are not readily deformable and which are mostly formed by a shaping process by means of a tool, for example by injection molding, compression molding, blow molding, etc.
  • the cover and the dual injection molding process multi-component injection molding process
  • rigid-walled parts are covered, at least on one side, completely or partially by prefabricated bodies (covers) made of plastics or plastic laminates with the desired properties.
  • the covers are preferably designed such that surfaces of the rigid-walled parts and covers come to rest.
  • tools have to be provided for the manufacture of the covers and that a combined special operation is necessary.
  • the rigid-walled part is first formed in one mold, for example from a plastic of high strength with high gas permeability, onto which the cover made of a plastic with low gas permeability is sprayed in the same mold in a second injection process.
  • the mold cavity must be expanded in accordance with the dimensioning of the cover, which is usually done by limited opening of the mold.
  • This process does not require any special tools for the covers and the assembly process for the part and the cover, but it is relatively slow compared to the conventional spraying process with one-time batch charging because the molded part has to cool down in the mold before the cover can be sprayed on which then has to cool and solidify before forming.
  • Fig. 1 an open injection mold in section, the die is covered with a film;
  • 6A a rigid-walled part in section and in perspective with an outer coating.
  • the tube head 10 consists of a shoulder 11 and a spout 12 which is provided with a thread 13 (the injection molded part) onto which a cap (not shown) can be screwed.
  • the tube head 10 is a hollow body with an inner recess 14, the cross-sectional shape of which corresponds essentially to the contour of the outer surface of the tube head 10, thus forming the walls of the shoulder 11 and that of the spout 12.
  • the surface of the inner recess 14 is coated with a film 15a, for example by melting the film onto the injection molded part, which covers the inner surfaces of the shoulder 11 and the spout 12, including the spout opening 16.
  • the shoulder 11 has a peripheral edge 17, along which a prefabricated tube (not shown) is connected to the tube head 10.
  • the tube head 10 made from a casting resin, for example polyethylene (PE) or polypropylene (PP), by injection molding, is connected to a plastic layer of the tube tube by applying heat and pressure.
  • PE polyethylene
  • PP polypropylene
  • the improvement of the properties of a tube head 10 or the adaptation of the properties of the tube head 10 to that of the tube tube is a typical see application of the invention.
  • multilayer films with barrier layers having a high barrier effect, for example metal have been developed for their tube tubes, which prevent the films from penetrating, for example, substances which are harmful to oxygen and moisture and other packaged goods.
  • the barrier layers also prevent aroma substances or other active ingredients of personal care products and pharmaceuticals from being lost through foils.
  • the tube heads 10 which are injection molded from casting resins of the type mentioned are so that the latter are to be sealed by special measures, ie inserts, coatings, etc., so that the barrier properties of the head comparable to the foils are achieved.
  • FIGS. 1 to 5 The device for carrying out the method according to the invention is shown in FIGS. 1 to 5 as an injection mold 20 in an injection mold 21.
  • the latter is not restricted to one injection mold 20 per injection molding tool 21 (hereinafter injection molding tool 21 for short), with a correspondingly constructive design, injection molds 21 can also have several injection molds 20.
  • the injection mold 21 comprises two mold halves, namely the mold half 23 carrying a die 22 (hereinafter referred to briefly as die mold holder 23) and the mold half 25 bearing the stamp 24 (hereinafter referred to as stamp mold half 25).
  • the die half 23 is connected to the fixed machine plate 26 on the cast side and the die holder 25 is connected to the movable machine plate 27 on the opening side, the movability of the machine plate 27 being used to open the injection mold 21 (shown in FIG. 1) and to close it ( shown in Fig. 3).
  • the movement is drawn, in the present Example in the horizontal direction, but it could also be directed vertically, by hydraulic or mechanical devices (not shown) of an injection molding machine (not shown).
  • the die form holder 23 comprises a sprue plate 28 which is connected to the machine plate 26 and a die plate 29 which is connected to the sprue plate 28.
  • the sprue plate 28 is intended for receiving the pouring channels 30, through which liquefied casting resin is injected under pressure m into the injection mold 20, forming the injection molding part, in the present case a tube head 10 of the type described.
  • the die 22 Received in the die plate 29 is the die 22 which, together with the punch 24, determines the mold cavity 31 necessary to form a tube head 10 and forms the outer surfaces of the shoulder 11 and the spout 12.
  • the die 22 comprises a shoulder ring 32 (which forms the round shoulder 11) and a pouring ring 33 (which forms the spout 12) and is firmly inserted into the die plate 29.
  • the pouring ring 33 has a thread 34 on its outer circumference which, after filling the die 22 (closed ring halves 33a, 33b), forms so-called undercuts which make it impossible for the tube head 10 to extend out of the die 22, unless special precautions have been taken met.
  • the pouring ring 33 is divided into two and the ring halves 33a and 33b in the die plate 29 can be pulled apart to form or release the thread.
  • the means necessary for this are not shown in detail.
  • the shoulder ring 32 runs around a molding ring 35 which has two purposes, namely the molding cavity 31 in the direction of the machine plate 27 along its free circumferential end, forming the edge 17 in the case of mold filling, to be closed, and to act as an abutment for the film 15 when the tube head 10 is cut out of the film 15.
  • the shaped ring 35 is axially displaceable on the outer circumference of the shoulder ring 32 in the direction of the sprue plate 28.
  • a press ring 36 is in engagement with the form ring 35 and can be displaced axially spring-biased to the outer circumference of the die 22 by means of pins 37 with shoulders 38, which pins are received in bores.
  • a spring 39 is shown which acts on the shoulder 38.
  • the force can also be generated by hydraulic or pneumatic means.
  • the distance of the axial displacement of the shaped ring 35 together with the press ring 36 on the outer circumference of the shoulder ring 32 in the direction of the sprue plate 28 is essentially determined by the wall thickness of the tube shoulder 11.
  • This distance possibly increased by an addition, for example one to five times the film thickness is sufficient to use a cut edge on the end face of the ejector sleeve 40 facing the sprue plate 28 to cut out the tube head 10, which is internally coated with a film 15a, from a film web 15 along the peripheral edge 17 (edge 17 acting as a counter-cut plate) of the shoulder 11.
  • the film web 15 is held clamped between the end face of the molding ring 35 facing the die form halves 25 and the end face of an ejector sleeve 40 encompassing the die 24.
  • the distance of the axial displacement of the molded ring 35 with the press ring 36 is limited by the shoulder 38 of the pins 37. If the shoulder 38 rests on the die plate 29, the axial displacement in the direction of the die form halves 25 has ended.
  • the length of the pins 37 (without shoulder 38) is dimensioned that when the shoulders 38 rest, the free end face of the press ring 36 prints the film 15 against the parting surface of the stamp mold halves 25 and, when the injection mold 21 is closed, against the end face of the ejector sleeve 40.
  • the spring 39 and shoulder 38 of a pin 37 are shown arranged in the sprue plate 28, but the spring 39 and shoulder 38 could also be arranged in the die plate 29.
  • the stamp form half 25 comprises a rear stamp plate 46 holding the stamp 24 and a front stamp plate 47 spaced apart therefrom.
  • the rear stamp plate 46 is connected to the machine plate 27 on the opening side, while the front stamp plate 47 is in the closed state of the injection mold 21 on the die plate 29 is applied and forms the mold separation with it.
  • the front stamp plate 47 and the rear stamp plate 46 are firmly connected to one another by means of stud bolts 48, leaving an intermediate space 49 between them.
  • An ejector plate 50 is movably arranged in this intermediate space 49 between the rear stamp plate 46 and the front stamp plate 47. The movement of the ejector plate 50 is guided, the ejector plate 50 being displaceable along the stud bolts 48, which act as guide bolts with respect to the ejector plate 50.
  • the ejector plate 50 is displaceable along the stamp 24.
  • the stamp 24 has channels 51 through which a fluid, for example air or another gas, is preferably heated, conductive and to which a vacuum can also be applied.
  • the punch 24 On its outer circumference, the punch 24 carries in its longitudinal direction, ie axially displaceable also through a recess 55 in the front stamp plate 47, the ejector sleeves 40, which are in a recess 52 in the front stamp plate 47 and in the recess 53 of the ejector plate 50 is received, the recesses 52 and 53 engaging around the punch 42 in the form of flat-bottomed blind holes, axially following one another in the front punch plate 47 and ejector plate 50.
  • a fluid for example air or another gas
  • the bottom 54 of the recess 52 of the front stamping plate 47, together with a shoulder 56, on the outer circumference of the ejector sleeve 40 serve as a stop which limits the axial distance of the ejector sleeve 40 exiting (in the direction of the die form half 23).
  • the bottom 58 of the recess 53 in the ejector plate 50 is designed in the form of two flat, concentrically mutually extending bottom (an inner bottom 58a, an outer bottom 58b), which are offset in a stepwise manner, the inner bottom 58a being inserted deeper into the ejector plate is than the bottom 58b.
  • the bottom 58a with the adjoining bore, which corresponds in diameter to that of the ejector sleeve 40 so that a part of it can enter the bore, serves together with the end face 57 of the ejector sleeve 40 as a stop, which defines the axial path of the entry of the Ejector sleeve 40 limited.
  • the distance between the separating surface of the injection mold 20 and the bottom 58a is determined by the length of the ejector sleeve when the ejector plate 50 rests on the rear stamp plate 46, so that when the ejector sleeve 40 is retracted, its front circular end face 59 coincides with the mold separating surface.
  • a spring 60 Arranged between the bottom 58b and the shoulder 56 is a spring 60 which surrounds the outer circumference of the ejector sleeve 40 and which extends in the longitudinal direction when the injection mold 20 is open (FIG. 1), starting from the recess 53 to the shoulder 56, in the recess 52 (FIG . 1) .
  • the spring 60 is equally restricted between the bottom 58b and the shoulder 56, running in its axial longitudinal extent, approximately to the length of the recess 53 running in the same direction (FIG. 3).
  • the Spring 60 as a power source, hydraulic or pneumatic power sources could also be used, acting in the axial direction on two sides by allowing the ejector sleeve 40 to extend from the die half 25 during the process of opening the injection mold 20, while at the same time the ejector plate 50 against the rear die plate 46 prints.
  • the task of the ejector plate 50 driven from the outside for movement in the direction of the front stamp plate 47, is to press the ejector sleeve 40 (in the retracted position) against the shaped ring 35 in order to remove the latter from the injection molded part (tube head 10) on the outer circumference of the shoulder ring 32 to postpone.
  • the unloading process of an injection mold according to the invention thus consists of a separating process (cutting out the injection molded part from the film) with the mold closed and an unloading process (throwing the molded part off a stamp) with the mold open.
  • a groove 61 In order to improve the clamping effect between the press ring 36 and the end face 59 of the ejector sleeve 40, a groove 61, the contour of two faces converging at an angle in a tip, is introduced into the end face concentrically to the circumference of the ejector sleeve 40.
  • the shaped ring 35 carries on its end face facing the ejector sleeve 40 a projection 62 which is shaped in accordance with the groove 61 and which, when the injection molding tool 21 is closed, engages the films 15 by jamming between them and the groove 61.
  • the method according to the invention runs in a pre-designed manner direction, as described above by way of example, as follows.
  • the opening of a die is understood to mean the opening through which a stamp as a molded part enters the die is covered with a film 15 when the injection mold 20 is open. While the injection mold 20 closes, ie closes, preferably a hold-down device protruding from the die form halves 25 comes into engagement with the film 15 and presses it against the separating surface 43 of the die holder 23.
  • the ejector sleeve 40 fulfills the function of the hold-down device , while the separating surface 43 is formed by the end face of the shaped ring 35. The pressure effect exerted by the hold-down device takes place all around the opening of the die 22.
  • the hold-down device remains in engagement with the film 15, but it moves in the opposite direction into the die form halves 25, corresponding to the closing distance covered, during the , stamp 24 protruding from the front stamp plate 47 into the die.
  • the end face 45 of the punch 24 comes into contact with the film 15a covering the die opening and loads the latter into the mold cavity of the die 22, the film 15a remaining clamped by the hold-down device.
  • the displacement of the film 15a by means of the plunger 24 continues until the injection mold 20 is closed and the plunger 24 is completely inserted into the die 22.
  • the injection mold 21 is filled with liquefied casting resin under pressure.
  • the pressurized casting resin lays the Film 15a to the surface of the die 24 and an internally coated injection molded part 10 is formed. If the filling takes place between the surface of the stamp 24 and the film 15a (cut to stamp), the pressurized liquid casting resin applies the film 15 to the surface of the die 22 and an externally coated injection molded part is formed (the latter type of cut is shown in the figures not shown) .
  • the warmth of an injection mold 20 is usually sufficient to heat a film 15a to the extent that it can be plasticized so that it can be brought into contact with the surface of a shaping plunger 24 or that of a die 22 through the liquid casting resin injected under pressure.
  • foils are to be warmed to a greater extent for their deformation, that is to say are to be plasticized more strongly than the injection mold can convey to them, then further heating of the foil 15a is provided according to the invention.
  • a heated fluid is blown against the film through the channels 51.
  • a vacuum can advantageously be applied to further support the contact of the film 15a on the surfaces of the die 22 or stamp 24, which pulls the film 15a against said surfaces.
  • Injection molds for internally and externally coated parts are fundamentally of the same structure, with the outside of the die to the stamp being able to be built into the mold halves in the opposite way to that described for the outside coating.
  • the vacuum is applied by means of the same channels 51.
  • the fluid is switched off and the channels 51 are connected to a vacuum source.
  • the injection molded part is separated from the film 15 when the injection mold 20 is closed.
  • the ejector plate 50 is moved in the direction of the front stamp plate 47 with the ejector sleeve retracted.
  • the end face 59 moves the thrower sleeve 40 the shaped ring 35 with press ring 36 on the outer circumference of the shoulder ring 32 in the direction of the sprue plate 28, the film 15 being separated from the film 15a along the edge 17 of the shoulder 11.
  • the ejector sleeve 40 displaces the molded ring 35 and press ring 36 via the pins 37 and shoulders 38 in the direction of the spring 39 and compresses the latter, ie, with increasing distance of the displacement, the force acting against the direction of displacement (spring force) increases.
  • the ejector plate 50 is retracted, while the springs 39 hold the molded ring 35 in contact with the end face 59 of the ejector sleeve 40 (clamping the film 15 between them) by expansion.
  • the injection molding is solidified to such an extent that the injection mold 20 can be opened for unloading.
  • the pouring ring halves 33a and 33b are opened by means not shown to release the external thread of the pouring spout 12. Subsequently, the injection mold 20 is opened by retracting a mold half, in the case described here by way of example, the stamp mold half 25.
  • the spring 60 takes effect and pushes the ejector sleeve 40 against the opening direction of the stamp mold halves 25 until the shoulder 56 engages with the bottom 54 in the recess 52 of the front stamp plate 47.
  • the plunger 24 moves back with the plunger mold halves 25, the injection molded part 10 is held in the die 22 by the ejector sleeve 40 until the shoulder 56 has come into engagement with the base 54 (final displacement position).
  • part 10 begins, for example from the thrower sleeve 40 worn, extend synchronously with the opening of the injection mold 10 from the die 22. After completion of the opening process, the part 10 is disengaged from the ejector sleeve 40.
  • the discharge is thus characterized by the fact that a manufactured injection molded part is held in one half of the mold, while the other half of the mold is opened with the taking of shaping parts, for example stamps.
  • the extension of the held part from the corresponding mold half preferably begins when the molding parts of the other mold half have been extended from the part.
  • this type of delayed unloading has the advantage that there is no need to push the injection molded part away from shaping parts by means of ejectors that act on the injection molding part and require certain wall thicknesses.
  • thin-walled parts can be injection molded. After the mold has been unloaded, the film is pulled so much that it completely covers the opening of the die again.
  • Plastic monofilms, pure plastic laminate films and metal-plastic laminate films with properties desired in individual cases come into consideration as films. Their heat resistance should be selected so that they are not melted during the injection molding process. The film thickness is determined according to the forces that are available on the tool side for removal.
  • Container closures in particular heads for tubes, produced by the process according to the invention have the further Their advantage of being provided with a "tamper evident seal" without additional effort, in that the film closes the spout openings during closure production. If the spanning film were damaged, the seal should be broken.

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

Abstract

Pour améliorer les propriétés (imperméabilité aux gaz, blocage des arômes, faible absorption d'eau, etc.) d'objets en plastique présentant le cas échéant des propriétés insuffisantes, lesdits objets sont couverts de plastiques possédant des propriétés supérieures. L'application du revêtement s'effectue par montage de deux parties préfabriquées ou par application par pulvérisation d'un plastique de qualité supérieure sur un objet présentant des qualités insuffisantes. Les procédés connus exigent de nombreux outils. La présente invention concerne un procédé et un dispositif qui permettent de réduire le nombre d'outils utilisés.
PCT/CH2000/000272 1999-06-01 2000-05-17 Procede et dispositif permettant de fabriquer des articles moules en plastique, possedant au moins deux couches WO2000073038A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU43890/00A AU4389000A (en) 1999-06-01 2000-05-17 Method and device for producing plastic molded bodies with at least two layers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1032/99 1999-06-01
CH01032/99A CH693562A5 (de) 1999-06-01 1999-06-01 Verfahren und Vorrichtung zur Herstellung eines zumindest zweischichtigen Formkörpers aus Kunststoff und nach dem Verfahren hergestellten Formkörper.

Publications (1)

Publication Number Publication Date
WO2000073038A1 true WO2000073038A1 (fr) 2000-12-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH2000/000272 WO2000073038A1 (fr) 1999-06-01 2000-05-17 Procede et dispositif permettant de fabriquer des articles moules en plastique, possedant au moins deux couches

Country Status (3)

Country Link
AU (1) AU4389000A (fr)
CH (1) CH693562A5 (fr)
WO (1) WO2000073038A1 (fr)

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3208649A (en) * 1961-08-01 1965-09-28 Roehr Products Company Inc Tamper proof closure
FR2459116A1 (fr) * 1979-06-20 1981-01-09 Yoshida Kogyo Kk Procede et moule pour la fabrication d'un article decore par introduction d'une feuille decoree dans ce moule et article en matiere plastique ainsi obtenu
JPS60212314A (ja) * 1984-04-09 1985-10-24 Dainippon Printing Co Ltd 絵付用射出成形金型装置
EP0326355A2 (fr) * 1988-01-25 1989-08-02 Du Pont Canada Inc. Procédé de moulage par injection d'articles multicouches
EP0442128A2 (fr) * 1990-02-10 1991-08-21 Bayer Ag Procédé pour fabriquer des corps moulés à plusieurs couches
WO1991017035A1 (fr) * 1990-04-30 1991-11-14 Ontario Die Company Of America Procede et appareil servant a produire des pieces structurelles moulees par injection
EP0497335A2 (fr) * 1991-02-01 1992-08-05 Commer S.P.A. Procédé pour la fabrication de panneaux revêtus
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