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GB1195404A - Improvements in the Injection Moulding of Foamed Articles - Google Patents

Improvements in the Injection Moulding of Foamed Articles

Info

Publication number
GB1195404A
GB1195404A GB4687267A GB4687267A GB1195404A GB 1195404 A GB1195404 A GB 1195404A GB 4687267 A GB4687267 A GB 4687267A GB 4687267 A GB4687267 A GB 4687267A GB 1195404 A GB1195404 A GB 1195404A
Authority
GB
United Kingdom
Prior art keywords
mould
cavities
cavity
composition
parts
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.)
Expired
Application number
GB4687267A
Inventor
David Fairclough Oxley
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Priority to GB4687267A priority Critical patent/GB1195404A/en
Publication of GB1195404A publication Critical patent/GB1195404A/en
Expired legal-status Critical Current

Links

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
    • B29C44/34—Auxiliary operations
    • B29C44/58—Moulds
    • B29C44/586—Moulds with a cavity increasing in size during foaming
    • 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
    • B29C44/04—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 consisting of at least two parts of chemically or physically different materials, e.g. having different densities
    • B29C44/0461—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 consisting of at least two parts of chemically or physically different materials, e.g. having different densities by having different chemical compositions in different places, e.g. having different concentrations of foaming agent, feeding one composition after the other
    • 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
    • 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

Landscapes

  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

1,195,404. Injection moulding. IMPERIAL CHEMICAL INDUSTRIES Ltd. 10 Oct., 1968 [13 Oct., 1967], No. 46872/67. Heading B5A. In a method of producing cellular articles in a mould having one or more mould cavities and two mould parts movable towards and away from each other, the mould walls being of resilient material, a foamable thermoplastic composition is injected at its foaming temperature into the mould while the said parts are urged towards each other to compress the walls and reduce the cavity or cavities, after which the pressure urging the parts together is reduced so that the resilience of the wall material expands the cavity or cavities to allow the composition to foam. Examples of moulding compositions include polyethylene, polypropylene, polymers and copolymers of styrene with a suitable blowing agent. The mould may comprise metal backing plates with a resilient cavity containing former e.g. of silicone rubber therebetween, one of the plates being apertured for the injection of the composition.
GB4687267A 1967-10-13 1967-10-13 Improvements in the Injection Moulding of Foamed Articles Expired GB1195404A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4687267A GB1195404A (en) 1967-10-13 1967-10-13 Improvements in the Injection Moulding of Foamed Articles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4687267A GB1195404A (en) 1967-10-13 1967-10-13 Improvements in the Injection Moulding of Foamed Articles

Publications (1)

Publication Number Publication Date
GB1195404A true GB1195404A (en) 1970-06-17

Family

ID=10442911

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4687267A Expired GB1195404A (en) 1967-10-13 1967-10-13 Improvements in the Injection Moulding of Foamed Articles

Country Status (1)

Country Link
GB (1) GB1195404A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0481306A1 (en) * 1990-10-05 1992-04-22 Sumitomo Chemical Company, Limited Method for molding polypropylene resin
EP0544501A2 (en) * 1991-11-28 1993-06-02 Mitsui Petrochemical Industries, Ltd. Process for preparing composite foamed molded article
CN112289499A (en) * 2020-10-22 2021-01-29 安徽瑞之星电缆集团有限公司 Radio frequency signal transmission cable for outer space and manufacturing process thereof

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0481306A1 (en) * 1990-10-05 1992-04-22 Sumitomo Chemical Company, Limited Method for molding polypropylene resin
US5252269A (en) * 1990-10-05 1993-10-12 Sumitomo Chemical Co., Ltd. Method for molding polypropylene resin
EP0544501A2 (en) * 1991-11-28 1993-06-02 Mitsui Petrochemical Industries, Ltd. Process for preparing composite foamed molded article
EP0544501A3 (en) * 1991-11-28 1993-06-23 Mitsui Petrochemical Industries, Ltd. Process for preparing composite foamed molded article
US5292465A (en) * 1991-11-28 1994-03-08 Mitsui Petrochemical Industries, Ltd. Process for preparing composite foamed molded article
CN112289499A (en) * 2020-10-22 2021-01-29 安徽瑞之星电缆集团有限公司 Radio frequency signal transmission cable for outer space and manufacturing process thereof

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees