UST883004I4 - Defensive publication - Google Patents

Defensive publication Download PDF

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Publication number
UST883004I4
UST883004I4 US883004DH UST883004I4 US T883004 I4 UST883004 I4 US T883004I4 US 883004D H US883004D H US 883004DH US T883004 I4 UST883004 I4 US T883004I4
Authority
US
United States
Prior art keywords
injection
mold
laminate
injected
layers
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
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 filed Critical
Application granted granted Critical
Publication of UST883004I4 publication Critical patent/UST883004I4/en
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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping 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
    • B29C44/08—Shaping 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 using several expanding or moulding steps
    • B29C44/083—Increasing the size of the cavity after a first part has foamed, e.g. substituting one mould part with another
    • B29C44/086—Increasing the size of the cavity after a first part has foamed, e.g. substituting one mould part with another and feeding more material into the enlarged 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
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1635—Making multilayered or multicoloured articles using displaceable mould parts, e.g. retractable partition between adjacent mould cavities
    • 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
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C2045/167—Making multilayered or multicoloured articles injecting the second layer through the first layer
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
    • Y10S264/83—Injection molding of polyolefin-type foam

Definitions

  • a laminate of synthetic polymeric materials is produced by an injection molding process wherein the first layer of the laminate is injected into a mold through a first sprue. The first injection is permitted to cool to be sufficiently self-supporting to prevent the material of the first injection from blocking the second injection. The mold cavity is subsequently enlarged, and a second amount of polymeric material is injected into the mold through a second sprne extending through the first layer formed by the first injection.
  • the two layers may be of the same or different polymeric materials, and may be thermoplastic or thermosetting. Fillers may also be present in the polymeric material.
  • One of the layers, preferably the second, may be a foamable composition. Laminates produced according to the process are useful in the production of large area moldings, such as door panels, interior trim panels of automobiles, and any application in which a smooth surface attached to a bulky backing is required.

Abstract

A LAMINATE OF SYNTHETIC POLYMERIC MATERIALS IS PRODUCED BY AN INJECTION MOLDING PROCESS WHEREIN THE FIRST LAYER OF THE LAMINATE IS INJECTED INTO A MOLD THROUGH A FIRST SPRUE. THE FIRST INJECTION IS PERMITTED TO COOL TO BE SUFFICIENTLY SELF-SUPPORTING TO PREVENT THE MATERIAL OF THE FIRST INJECTION FROM BLOCKING THE SECOND INJECTION. THE MOLD CAVITY IS SUBSEQUENTLY ENLARGED, AND A SECOND AMOUNT OF POLYMERIC MATERIAL IS INJECTED INTO THE MOLD THROUGH A SECOND SPRUE EXTENDING THROUGH THE FIRST LAYER FORMED BY THE FIRST INJECTION. THE TWO LAYERS MAY BE OF THE SAME OR DIFFERENT POLYMERIC MATERIALS, AND MAY BE THERMOPLASTIC OR THERMOSETTING. FILLERS MAY ALSO BE PRESENT IN THE POLYMERIC MATERIAL. ONE OF THE LAYERS, PREFERABLY THE SECOND, MAY BE A FOAMABLE COMPOSITION. LAMINATES PRODUCED ACCORDING TO THE PROCESS ARE USEFUL IN THE PRODUCTION OF LARGE AREA MOLDINGS, SUCH AS DOOR PANELS, INTERIOR TRIM PANELS OF AUTOMOBILES, AND ANY APPLICATION IN WHICH A SMOOTH SURFACE ATTACHED TO A BULKY BACKING IS REQUIRED.

Description

DEFENSIVE PUBLICATIQN UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16, 1969, S69 O.G. 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The heading of each abstract indicates the number of pages of specification. including claims and sheets of drawings contained in the application as originally filed. 'lhe files of these applications are available to the public for inspection and reproduction may be purchased for 30 cents a sheet.
Defensive Publication applications have not been examined as to the merits of alleged invention. The Patent Ofiice makes no assertion as to the novelty of the disclosed subject matter.
PUBLISHED FEBRUARY 2, 1971 T883,004 PRODUCTION OF LAMINATES Denis James Henry Sandiford and Alan George Smith,
Weiwyn Garden City, England, assignors to Imperial Chemical Industries Limited, London, England, a cor.
poration of Great Britain Filed Oct. 27, 1969, Ser. No. 869,859 Claims priority, application Great Britain, Nov. 6, 1968. 52,658/ 68 Int. Cl. B29d 27/04 US. Cl. 264-45 No Drawing. 10 Pages Specification A laminate of synthetic polymeric materials is produced by an injection molding process wherein the first layer of the laminate is injected into a mold through a first sprue. The first injection is permitted to cool to be sufficiently self-supporting to prevent the material of the first injection from blocking the second injection. The mold cavity is subsequently enlarged, and a second amount of polymeric material is injected into the mold through a second sprne extending through the first layer formed by the first injection.
The two layers may be of the same or different polymeric materials, and may be thermoplastic or thermosetting. Fillers may also be present in the polymeric material. One of the layers, preferably the second, may be a foamable composition. Laminates produced according to the process are useful in the production of large area moldings, such as door panels, interior trim panels of automobiles, and any application in which a smooth surface attached to a bulky backing is required.
US883004D 1968-11-06 1969-10-27 Defensive publication Pending UST883004I4 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5265868 1968-11-06

Publications (1)

Publication Number Publication Date
UST883004I4 true UST883004I4 (en) 1971-02-02

Family

ID=10464774

Family Applications (1)

Application Number Title Priority Date Filing Date
US883004D Pending UST883004I4 (en) 1968-11-06 1969-10-27 Defensive publication

Country Status (3)

Country Link
US (1) UST883004I4 (en)
DE (1) DE1954478A1 (en)
GB (1) GB1264320A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4414258C2 (en) * 1994-04-23 1996-07-25 Battenfeld Gmbh Process for injection molding objects consisting of at least two different layers
DE4417952A1 (en) * 1994-05-21 1995-11-23 Petri Ag Cover for gas bag impact protection devices and process for their manufacture

Also Published As

Publication number Publication date
DE1954478A1 (en) 1970-06-11
GB1264320A (en) 1972-02-23

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