JPS5525356A - Injection molding for foam articles - Google Patents

Injection molding for foam articles

Info

Publication number
JPS5525356A
JPS5525356A JP9823378A JP9823378A JPS5525356A JP S5525356 A JPS5525356 A JP S5525356A JP 9823378 A JP9823378 A JP 9823378A JP 9823378 A JP9823378 A JP 9823378A JP S5525356 A JPS5525356 A JP S5525356A
Authority
JP
Japan
Prior art keywords
synthetic resin
filler
mold cavity
pressure condition
gas
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
JP9823378A
Other languages
Japanese (ja)
Inventor
Hiroshi Kataoka
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.)
Asahi Dow Ltd
Asahi Chemical Industry Co Ltd
Original Assignee
Asahi Dow Ltd
Asahi Chemical Industry Co 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 Asahi Dow Ltd, Asahi Chemical Industry Co Ltd filed Critical Asahi Dow Ltd
Priority to JP9823378A priority Critical patent/JPS5525356A/en
Priority to FR7919319A priority patent/FR2433407A1/en
Priority to DE19792931461 priority patent/DE2931461A1/en
Publication of JPS5525356A publication Critical patent/JPS5525356A/en
Pending 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
    • B29C44/02—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
    • B29C44/10—Applying counter-pressure during expanding
    • B29C44/105—Applying counter-pressure during expanding the counterpressure being exerted by a fluid

Abstract

PURPOSE:A heavy walled expanded body containing the filler is molded excellently by keeping a mold cavity pressure condition by gas, prior to injection of the synthetic resin containing the filler and the blowing agent. CONSTITUTION:After heat plastization of the synthetic resin containing the blowing agents is molded the expanded profile by injecting it to a mold cavity. Then, more than 10 weight percent of a filler which is not able to dissolve a synthetic resin in uniform and a synthetic resin containing the blowing agent of 0.5-5 weight percent are injected in not enough volume to fill a mold cavity into the cavity formed by a cooled mold in keeping the pressure condition by gas prior to injection of the synthetic resin. During or directly after the synthetic resin, the pressure condition by gas in the mold cavity is released. As the filler are used a gummy grain, a glass fibre and a calcium carbonate powder and others.
JP9823378A 1978-08-14 1978-08-14 Injection molding for foam articles Pending JPS5525356A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP9823378A JPS5525356A (en) 1978-08-14 1978-08-14 Injection molding for foam articles
FR7919319A FR2433407A1 (en) 1978-08-14 1979-07-26 Injection moulded thermoplastic foam component - having lower density at its core, produced in pressurised mould having delayed injection pressure
DE19792931461 DE2931461A1 (en) 1978-08-14 1979-08-02 FOAM PRODUCTS AND METHOD FOR THEIR PRODUCTION

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9823378A JPS5525356A (en) 1978-08-14 1978-08-14 Injection molding for foam articles

Publications (1)

Publication Number Publication Date
JPS5525356A true JPS5525356A (en) 1980-02-23

Family

ID=14214232

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9823378A Pending JPS5525356A (en) 1978-08-14 1978-08-14 Injection molding for foam articles

Country Status (1)

Country Link
JP (1) JPS5525356A (en)

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