NL9401392A - Method for fabricating a plastic lamina provided with a covering film, and lamina obtained via said method - Google Patents

Method for fabricating a plastic lamina provided with a covering film, and lamina obtained via said method Download PDF

Info

Publication number
NL9401392A
NL9401392A NL9401392A NL9401392A NL9401392A NL 9401392 A NL9401392 A NL 9401392A NL 9401392 A NL9401392 A NL 9401392A NL 9401392 A NL9401392 A NL 9401392A NL 9401392 A NL9401392 A NL 9401392A
Authority
NL
Netherlands
Prior art keywords
plastic
sheet
preform
lamina
shape
Prior art date
Application number
NL9401392A
Other languages
Dutch (nl)
Inventor
Franciscus Egbertus Richters
Johannes Duering
Andreas Bernardus Eidhof
Christiaan Antonius Jagers
Original Assignee
Corell Resin Technology Bv
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 Corell Resin Technology Bv filed Critical Corell Resin Technology Bv
Priority to NL9401392 priority Critical
Priority to NL9401392A priority patent/NL9401392A/en
Priority claimed from NL1000615A external-priority patent/NL1000615C2/en
Priority claimed from EP95201682A external-priority patent/EP0692358A1/en
Publication of NL9401392A publication Critical patent/NL9401392A/en

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/12Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
    • B29C44/14Incorporating or moulding on preformed parts, e.g. inserts or reinforcements the preformed part being a lining
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/10Applying counter-pressure during expanding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/10Applying counter-pressure during expanding
    • B29C44/105Applying counter-pressure during expanding the counterpressure being exerted by a fluid
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14Injection 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
    • B29C45/1418Injection 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
    • B29C45/14196Injection 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 the inserts being positioned around an edge of the injected part
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14Injection 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
    • B29C45/1418Injection 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
    • B29C2045/14237Injection 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 the inserts being deformed or preformed outside the mould or mould cavity
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2023/00Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04Polymers of ethylene
    • B29K2023/06PE, i.e. polyethylene
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2023/00Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04Polymers of ethylene
    • B29K2023/08Copolymers of ethylene
    • B29K2023/083EVA, i.e. ethylene vinyl acetate copolymer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2023/00Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10Polymers of propylene
    • B29K2023/12PP, i.e. polypropylene
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2025/00Use of polymers of vinyl-aromatic compounds or derivatives thereof as moulding material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2031/00Use of polyvinylesters or derivatives thereof as moulding material
    • B29K2031/04Polymers of vinyl acetate, e.g. PVAc, i.e. polyvinyl acetate
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2055/00Use of specific polymers obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in a single one of main groups B29K2023/00 - B29K2049/00, e.g. having a vinyl group, as moulding material
    • B29K2055/02ABS polymers, i.e. acrylonitrile-butadiene-styrene polymers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2071/00Use of polyethers, e.g. PEEK, i.e. polyether-etherketone or PEK, i.e. polyetherketone or derivatives thereof, as moulding material
    • B29K2071/12PPO, i.e. polyphenylene oxide; PPE, i.e. polyphenylene ether
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2105/00Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • B29K2105/043Skinned foam
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2105/00Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2105/00Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/16Fillers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2105/00Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/26Scrap or recycled material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2995/00Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0012Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular thermal properties
    • B29K2995/0015Insulating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2995/00Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037Other properties
    • B29K2995/0063Density
    • B29K2995/0064Non-uniform density
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2995/00Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037Other properties
    • B29K2995/0091Damping, energy absorption
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00Flat articles, e.g. films or sheets
    • B29L2007/002Panels; Plates; Sheets

Abstract

The invention provides a method for fabricating a plastic lamina provided with a covering film, said method comprising the following steps to be carried out in a suitable sequential order: 1) providing an injection-moulding apparatus with a plastic-plastifying (plastic-plasticating) and plastic- injection arrangement and with a mould which comprises two mould sections which can be moved relative to one another, in a closed first extreme position delimit a mould cavity having a shape which matches the shape of the lamina to be fabricated contiguous to the plastifying (plasticating) and injection unit, and in an open second extreme position release a moulded plate for the removal thereof; 2) fabricating a covering-film preform having an undercut peripheral-edge shape which matches the shape of the lamina to be fabricated, so that the covering film is able to extend around the peripheral edge of the lamina to be fabricated; 3) placing the preform against that wall of the opened mould cavity which faces away from the plastic inlet port connected to the plastic-plastifying (plastic- plasticating) and injection arrangement and holding the preform in position therein by means of retention means; 4) closing the mould cavity and actuating the plastifying (plasticating) and injection unit to inject plastified (plasticated) plastic which is able to adhere to the preform into the mould cavity; 5) deactuating the plastifying (plasticating) and injection unit; 6) moving the mould sections towards the second extreme position; and 7) cooling the formed lamina with covering film attached thereto to a selected temperature, completely opening the mould cavity and removing the fabricated lamina.

Description

A method for manufacturing a plastic sheet provided with a covering film, as well as a sheet obtained by that method.

The invention relates to a method for manufacturing a plastic sheet on which a cover foil is applied.

The object of the invention is to provide a method for manufacturing such a sheet, as well as the sheet itself, such that the cover film is not only on the surface thereof, but also extends around the peripheral edge of the sheet, such that during in normal use, for example as a table top, the peripheral edge of the foil is invisible.

To this end, the invention provides a method for manufacturing a plastic foil provided with a covering foil, which method comprises the following steps, to be carried out in an appropriate order: (1) providing an injection molding device with a plastic plasticizing and - injection device and a mold, comprising at least two mold parts which can be moved relative to each other, the mold parts in a closed first extreme position, a mold cavity connecting to the plasticizing and injection unit with a shape adapted to the shape of the sheet to be manufactured bounding, and in an open second extreme position, release a molded plate to be taken out; (2) manufacturing a cover film preform with an undercut circumferential edge shape adapted to the shape of the sheet to be manufactured, such that the cover film can extend around the peripheral edge of the sheet to be manufactured, (3) the placing the preform away from the opened mold cavity remote from the plastic feed opening connected to the plastic feed and injection device and holding it in position by means of holding means; (4) closing the mold cavity and energizing the plasticizing and injection unit for injecting plasticized plastic which can adhere with the preform into the mold cavity; (5) de-energizing the plasticizing and injecting unit; (6) moving the mold parts in the direction of the second extreme position; and (7) cooling the formed sheet with adhered cover film to a selected temperature, opening the mold cavity completely and removing the manufactured sheet.

Preferably, a method is used, comprising performing step (4) with polypropylene (PP) as the plastic to be injected. With such a method, a superior sheet can be obtained, while polyvinyl chloride (PVC) as a plastic is avoided.

In a further embodiment of the last described method, the method comprises steps (9) performing step (8) and (10) performing step (4) such that the manufactured plate has a thickness of at least 6 mm, preferably (20 ± 10) mm, which sheet comprises a sandwich-like structure with a foam core and closed skin plates.

This latter method can preferably be carried out by using step (11) performing step (10) using the instructions according to the non-prepublished Dutch patent application NL-94 01055. With this, a qualitatively superior sheet can be manufactured with a very smooth and flat surface, great rigidity and e <. n very low average density.

The method according to the invention can advantageously be carried out by applying step (12), performing step (2) by manufacturing, for example using a membrane press, a vacuum deep drawing device, or other suitable means of plastic foil. generally omega-shaped base preform and then, for example by cutting, removing an edge zone thereof to obtain the desired undercut shape of the cover film perform.

In a specific embodiment use is made of step (13) performing step (4) with compatible or similar plastics for foil and plastic to be injected.

Alternatively, use can be made of step (14) to carry out (4) using a foil with an adhesive layer present thereon, which can be directed towards the mold cavity, for example a heat-activatable plastic layer, such as polyethylene (PE).

The cover film preform does not necessarily have to fit accurately into the mold cavity. During the injection of the heated, plasticized plastic into the mold cavity, the preform can undergo softening and an associated shape change. In connection therewith, the method according to the invention can take place using step (15), performing step (2) such that the preform undergoes an expansion during the plastic injection in its peripheral zone, for instance such that the undercut is increased.

It is important that the preform is held in position in the mold cavity. This is essential in the case where the respective end wall of the opened mold cavity extends, for example, in a vertical plane. In this connection use can be made of step (16) performing step (3) with suction means, electrostatic means and / or mechanical means as holding means.

In order to ensure the desired dimensioning of the end product with good accuracy, use is preferably made of step (17) of dimensioning the mold cavity according to step (1), taking into account the cooling shrinkage of the injected plastic. This cooling shrinkage may, for example, be of the order of 1.6%.

Less critical, but nevertheless practical, that embodiment using step (18) is performing step (2) using a mold-forming mold face, taking into account the cooling shrinkage of the film material used. This cooling shrinkage may be of the order of 1.3%.

The invention furthermore relates to a plastic sheet on which a plastic cover foil has been applied, which sheet is manufactured using the method according to any one of claims 1-11, which cover foil extends over a surface of a sheet and around the peripheral edge thereof.

The invention will now be elucidated with reference to the annexed drawings. Show in this:

Figure 1, schematic of a mold for forming a basic preform in cross section; figure 2 shows a cross-section through the edge zone of the basic preform, before the cross section cutting operation; figure 3, a view corresponding to figure 2 of the situation after the cutting operation; figure 4 shows a highly schematic cross-section through an injection molding device; and figure 5 shows a cross-section through a sheet according to the invention, which is manufactured with the injection molding device according to figure 4.

Figure 1 schematically shows a cooled aluminum mold 1 with a molding surface 2 for forming a basic preform from a foil 3. For this purpose the foil 3 is brought over the molding surface 2 according to arrows 4 in order to be brought into the shown shape by vacuum molding or other suitable technique.

This basic preform is referred to as reference number 5.

Attention is drawn to the fact that the foil is not drawn in proportion to its actual depth. This also applies to the further figures.

After the mold 1 has cooled, the preform can be removed from the undercut mold surface 2 with a relatively small force. At a suitable moment, either in the phase in which the basic preform is still on the molding surface 2, or in the phase in which it is removed from it, a cutting operation can be carried out on the cross-section in accordance with Figure 2 by means of a knife 6. S-shaped edge zone are executed. As Figure 1 shows, the cross-section of the base preform 5 is generally omega-shaped. To carry out the method according to the invention, the end-edge zone 8 must be cut off, such that the edge zone 9 shown in figure 3 of the obtained preform has the desired, undercut shape shown. The end-edge zone is removed according to arrow 11. In Figures 2 and 3, the respective movements of the knife 6 are indicated by arrows 12 and 13, respectively.

Figure 4 shows an injection molding device 14. It comprises a plastic plasticizing and injection device, of which only the nozzle 15 is shown. This nozzle is connectable via a cavity 16, which in turn connects to an injection channel 17 in mold half 18, to the mold cavity 19, which is also bounded by the other mold half 20. The preform 10 is brought against the surface 21 of the mold cavity 19 and is held there in position by suction means consisting of a number of perforated or porous zones 22, which communicate via pipes 23 with a suction head (not shown).

The separation between the mold halves 18 and 20 can optionally take place at different levels. Three options have been drawn. These are indicated by 24, 25 and 26, respectively. Location 24 has the drawback that it can visibly stand out in the end product. To a lesser extent, this is the case with the separation 25. The partition 26 will be invisible, but again has the drawback that the possible depth of the undercut is limited.

It is further pointed out that the separation 26 may have the drawback that it is necessary to wait a relatively long time for the cooling shrinkage to be large enough to be able to remove the molded product from the opened mold.

When injecting plasticized plastic, in particular PP, according to arrows 27, the preform 10 will heat up and undergo processing. As a result, under the influence of the pressure of the injected plastic, the edge zone 7 can be pressed against the circumferential wall of the mold cavity 19 according to arrows 28.

Figure 5 finally shows a ready sheet 28, comprising a PP base sheet 29 on which a cover foil 30 is applied, such that it extends around the peripheral edge 30 thereof.

Attention is drawn to the fact that the adhesion between the injected plastic and the foil can be ensured in various ways. For example, use can be made of foil with an adhesive layer present thereon, or a heat-activatable glue.

Claims (12)

  1. A method of manufacturing a plastic sheet covered with a foil, which method comprises the following steps to be carried out in an appropriate order: (1) providing an injection molding device with a plastic plasticizing and injecting device and a mold, comprising at least two mold parts displaceable relative to each other, the mold parts limiting in a closed first extreme position a mold cavity connecting to the plasticizing and injection unit with a shape adapted to the shape of the sheet to be manufactured, and in an open second extreme position, release a molded plate to be taken out; (2) manufacturing a cover film preform with an undercut circumferential edge shape adapted to the shape of the sheet to be manufactured, such that the cover film can extend around the peripheral edge of the sheet to be manufactured, (3) the placing the preform away from the opened mold cavity remote from the plastic feed opening connected to the plastic feed and injection device and holding it in position by means of holding means; (4) closing the mold cavity and energizing the plasticizing and injection unit for injecting plasticized plastic which can adhere with the preform into the mold cavity; (5) de-energizing the plasticizing and injecting unit; (6) moving the mold parts in the direction of the second extreme position; and (7) cooling the formed sheet with adhered cover film to a selected temperature, opening the mold cavity completely and removing the manufactured sheet.
  2. The method of claim 1, comprising step: (8) performing step (4) with polypropylene (PP) as an injectable plastic.
  3. A method according to claim 2, comprising the steps: (9) performing step (8) and (10) performing step (4) such that the manufactured plate has a thickness of at least 6 mm, preferably (20 +) 10 mm, which sheet comprises a sandwich-like structure with a foam kera and closed skin plates.
  4. Method according to claim 3, comprising (11) performing step (10) using the instructions according to the non-prepublished Dutch patent application NL-94 01055.
  5. A method according to claim 1, comprising: (12) performing step (2) by making, for example, using a membrane press, a vacuum deep drawing device, or other suitable means, plastic foil of a generally omega-shaped base preform and then, for example by cutting, removing an edge zone thereof to obtain the desired undercut shape of the cover film perform.
  6. The method of claim 1, comprising: (13) performing step (4) with compatible or similar plastics for foil and plastic to be injected.
  7. A method according to claim 1, comprising: (14) performing step (4) by using a foil with an adhesive layer present thereon, which can be directed towards the mold cavity, for instance a heat-activatable plastic layer, such as polyethylene (PB).
  8. A method according to claim 1, comprising (15) performing step (?) Such that the preform undergoes expansion in its peripheral zone during the plastic injection, for example such that the undercut is increased.
  9. A method according to claim 1, comprising the step of: (16) performing step (3) with suction means, electrostatic means and / or mechanical means as holding means.
  10. The method of claim 1, comprising the step of: (17) sizing the mold cavity of step (1), taking into account the cooling shrinkage of the injected plastic.
  11. The method of claim 1, comprising the step of: (18) performing step (2) using a mold-forming mold face, taking into account the cooling shrinkage of the foil material used.
  12. A plastic sheet, on which a plastic cover film is applied, which sheet is manufactured using the method according to any one of claims 1 to 11, which cover film extends over a surface of a sheet and around its peripheral edge.
NL9401392A 1994-08-29 1994-08-29 Method for fabricating a plastic lamina provided with a covering film, and lamina obtained via said method NL9401392A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NL9401392 1994-08-29
NL9401392A NL9401392A (en) 1994-08-29 1994-08-29 Method for fabricating a plastic lamina provided with a covering film, and lamina obtained via said method

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
NL9401392A NL9401392A (en) 1994-08-29 1994-08-29 Method for fabricating a plastic lamina provided with a covering film, and lamina obtained via said method
NL1000615A NL1000615C2 (en) 1994-06-24 1995-06-20 Mfg. plastic board with sandwich structure with good thermal and acoustic insulation
EP95201682A EP0692358A1 (en) 1994-06-24 1995-06-21 Method for manufacturing a plastic board and a board obtained with this method
JP07159387A JP3075683B2 (en) 1994-06-24 1995-06-26 Method for producing plastic thick plate and thick plate obtained by this method
JP10010539A JPH10193390A (en) 1994-06-24 1998-01-22 Manufacture of plastic thick plate and thick plate obtained by the method
US09/059,971 US6193916B1 (en) 1994-06-24 1998-04-14 Method for manufacturing a plastic board

Publications (1)

Publication Number Publication Date
NL9401392A true NL9401392A (en) 1996-04-01

Family

ID=19864575

Family Applications (1)

Application Number Title Priority Date Filing Date
NL9401392A NL9401392A (en) 1994-08-29 1994-08-29 Method for fabricating a plastic lamina provided with a covering film, and lamina obtained via said method

Country Status (1)

Country Link
NL (1) NL9401392A (en)

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0033116A2 (en) * 1980-01-25 1981-08-05 Kunststoffwerk Philippine GmbH &amp; Co. KG Method and apparatus for foaming in situ of soft-foam plastic sheets with hard foam plastics
WO1984001352A1 (en) * 1982-09-29 1984-04-12 Nat Can Corp Multiwalled container and method of making same
JPS63216717A (en) * 1987-03-06 1988-09-09 Mitsubishi Motors Corp Manufacture of body-colored trim parts for vehicle
DE4100538A1 (en) * 1990-11-12 1992-05-14 Wulf & Co Emsa Werk Prodn. of flat plastic articles - by drawing decorative film across mould, cutting off outer rim, and injecting hot polymer shot to bond to and press film against tool face
JPH04219220A (en) * 1990-12-19 1992-08-10 Nissha Printing Co Ltd Insert mold
EP0502606A2 (en) * 1991-03-04 1992-09-09 Siebolt Hettinga Method for molding a laminate
DE4122412A1 (en) * 1991-07-06 1993-01-14 Bayer Ag Moulding prodn. with decorative surface - by inserting decorative material with edge bent inwards in injection moulding tool
DE4127241A1 (en) * 1991-08-17 1993-02-18 Bayer Ag Thermoplastics moulding mfr. with decorative layer covering edges - in which layer is laid in mould cavity and shaped by closing specified mould to form internal edge groove into which part is injection moulded
JPH0557744A (en) * 1991-08-30 1993-03-09 Sekisui Chem Co Ltd Manufacture of molded product with coating
GB2259884A (en) * 1991-09-28 1993-03-31 Rover Group A method of moulding a component with an outer paint surface
JPH06135216A (en) * 1992-10-28 1994-05-17 Mitsubishi Heavy Ind Ltd Vehicle suspension

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0033116A2 (en) * 1980-01-25 1981-08-05 Kunststoffwerk Philippine GmbH &amp; Co. KG Method and apparatus for foaming in situ of soft-foam plastic sheets with hard foam plastics
WO1984001352A1 (en) * 1982-09-29 1984-04-12 Nat Can Corp Multiwalled container and method of making same
JPS63216717A (en) * 1987-03-06 1988-09-09 Mitsubishi Motors Corp Manufacture of body-colored trim parts for vehicle
DE4100538A1 (en) * 1990-11-12 1992-05-14 Wulf & Co Emsa Werk Prodn. of flat plastic articles - by drawing decorative film across mould, cutting off outer rim, and injecting hot polymer shot to bond to and press film against tool face
JPH04219220A (en) * 1990-12-19 1992-08-10 Nissha Printing Co Ltd Insert mold
EP0502606A2 (en) * 1991-03-04 1992-09-09 Siebolt Hettinga Method for molding a laminate
DE4122412A1 (en) * 1991-07-06 1993-01-14 Bayer Ag Moulding prodn. with decorative surface - by inserting decorative material with edge bent inwards in injection moulding tool
DE4127241A1 (en) * 1991-08-17 1993-02-18 Bayer Ag Thermoplastics moulding mfr. with decorative layer covering edges - in which layer is laid in mould cavity and shaped by closing specified mould to form internal edge groove into which part is injection moulded
JPH0557744A (en) * 1991-08-30 1993-03-09 Sekisui Chem Co Ltd Manufacture of molded product with coating
GB2259884A (en) * 1991-09-28 1993-03-31 Rover Group A method of moulding a component with an outer paint surface
JPH06135216A (en) * 1992-10-28 1994-05-17 Mitsubishi Heavy Ind Ltd Vehicle suspension

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 191 (M - 495)<2247> 4 July 1986 (1986-07-04) *
PATENT ABSTRACTS OF JAPAN vol. 13, no. 6 (M - 781)<3354> 9 January 1989 (1989-01-09) *
PATENT ABSTRACTS OF JAPAN vol. 16, no. 563 (M - 1342) 4 December 1992 (1992-12-04) *
PATENT ABSTRACTS OF JAPAN vol. 17, no. 365 (M - 1442) 9 July 1993 (1993-07-09) *

Similar Documents

Publication Publication Date Title
US4328067A (en) Laminating method and apparatus
ES2258821T3 (en) Procedure and apparatus for the formation of a molded article.
US7887741B2 (en) Method for producing plastic products having grained surface thereon
DE4336878C2 (en) Process for producing a synthetic resin component
US4766025A (en) Composite molded article and method of making same
EP0720902B1 (en) Apparatus and method for moulding a multilayered trim component
EP0745471B1 (en) Sheet blow molding and molding method
US5439630A (en) Method for molding a trim panel with integrally formed simulated leather appliques
EP0483849B1 (en) Process for surface upgrading of articles manufactured by blow molding or thermoforming
DE19843921B4 (en) Process for producing composite plastic molded parts by injection-compression molding
EP0249939B1 (en) Method for press molding thermoplastic resins
EP0951984A1 (en) Method and apparatus for producing multilayered parts
JP3570580B2 (en) Method for producing fiber-reinforced thermoplastic resin molded article
US5783287A (en) Method of insert molding plastic parts to provide covered edge surfaces and plastic parts made thereby
EP0387883B1 (en) Label and method for in-mold molding using a label thereof
US20090085235A1 (en) Method and apparatus for making a microstructured or nanostructured article
US3801244A (en) Apparatus for making a foamed article having a plastic skin bonded thereto
KR950704107A (en) Composite molding apparatus and method for high pressure co-curing of a lightweight honeycomb core composite product having an inclined surface using a stabilized beveled honeycomb core having a low density, and a product formed by the same (A COMPOSITE MOLDING APPARATUS) AND METHOD FOR HIGH PRESSURE CO-CURE MOLDING OF LIGHTWEIGHT HONEYCOMB CORE COMPOSITE ARTICLES HAVING RAMPED SURFACES UTILIZING LOW DENSITY, STABILIZED RAMPED HONEYCOMB CORES AND PRODUCT FORMED THEREBY)
US6739856B2 (en) Equipment for hot moulding of articles made of thermoplastic material
RU2293018C2 (en) Moulded articles with discontinuous surface sections and method of their manufacturing
US5474134A (en) System for making a molded laminate
US20010036971A1 (en) Foamed thermoplastic resin molding and process for producing the same
EP0642910A1 (en) Insert molded article, and apparatus and method for producing the insert molded article
EP0320925B1 (en) Method for manufacturing plastic mouldings with a decoratively embossed surface coating
KR20050033629A (en) Molded parts with fabric surface areas and processes for their production