BE786847Q - Injection mould of foam plastics - Google Patents

Injection mould of foam plastics

Info

Publication number
BE786847Q
BE786847Q BE786847A BE786847A BE786847Q BE 786847 Q BE786847 Q BE 786847Q BE 786847 A BE786847 A BE 786847A BE 786847 A BE786847 A BE 786847A BE 786847 Q BE786847 Q BE 786847Q
Authority
BE
Belgium
Prior art keywords
foaming
pressure
mixture
mould
injection mould
Prior art date
Application number
BE786847A
Other languages
French (fr)
Original Assignee
Usm Corp
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
Priority claimed from ES372732A external-priority patent/ES372732A1/en
Application filed by Usm Corp filed Critical Usm Corp
Application granted granted Critical
Publication of BE786847Q publication Critical patent/BE786847Q/en

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
    • B29C44/36—Feeding the material to be shaped
    • B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
    • B29C44/42—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length using pressure difference, e.g. by injection or by vacuum
    • B29C44/422—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length using pressure difference, e.g. by injection or by vacuum by injecting by forward movement of the plastizising screw

Landscapes

  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

Components are moulded from a foamable molten plastic and a foaming agent, e.g. granular polypropylene or polystyrene sprayed with azobisformamide. The pressure exerted on the mixture is higher than the blowing pressure of the foaming agent. The mixture is maintained in liquid state until it has reached the injection mould and the foaming process is controlled to produce components of high cellular quality. The liquid mixture is placed in a mould cavity at a pressure above that necessary for foaming and the temperature is increased to that necessary for foaming. After the mould is filled the pressure is reduced to a value equal to the blowing pressure.
BE786847A 1969-10-10 1972-07-27 Injection mould of foam plastics BE786847Q (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ES372732A ES372732A1 (en) 1968-10-15 1969-10-10 Improvements in or relating to the moulding of articles of a cellular thermoplastic material
AR22470669 1969-10-14
AR17433969 1969-12-09

Publications (1)

Publication Number Publication Date
BE786847Q true BE786847Q (en) 1972-11-16

Family

ID=27145650

Family Applications (1)

Application Number Title Priority Date Filing Date
BE786847A BE786847Q (en) 1969-10-10 1972-07-27 Injection mould of foam plastics

Country Status (1)

Country Link
BE (1) BE786847Q (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0615834A1 (en) * 1993-03-15 1994-09-21 Sumitomo Wiring Systems, Ltd. Molded part of thermoplastic resin and method of fabricating same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0615834A1 (en) * 1993-03-15 1994-09-21 Sumitomo Wiring Systems, Ltd. Molded part of thermoplastic resin and method of fabricating same
US5645779A (en) * 1993-03-15 1997-07-08 Sumitomo Wiring Systems, Ltd. Molding part of thermoplastic resin and method of fabricating same

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Legal Events

Date Code Title Description
RE Patent lapsed

Owner name: USM CORP.

Effective date: 19840727