JPS56115231A - Expansion injection molding method - Google Patents

Expansion injection molding method

Info

Publication number
JPS56115231A
JPS56115231A JP1853480A JP1853480A JPS56115231A JP S56115231 A JPS56115231 A JP S56115231A JP 1853480 A JP1853480 A JP 1853480A JP 1853480 A JP1853480 A JP 1853480A JP S56115231 A JPS56115231 A JP S56115231A
Authority
JP
Japan
Prior art keywords
resin
pressure
expandable
mold cavity
expanding
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.)
Granted
Application number
JP1853480A
Other languages
Japanese (ja)
Other versions
JPS6331369B2 (en
Inventor
Akio Yasuike
Takehiro Shibuya
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 JP1853480A priority Critical patent/JPS56115231A/en
Publication of JPS56115231A publication Critical patent/JPS56115231A/en
Publication of JPS6331369B2 publication Critical patent/JPS6331369B2/ja
Granted 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
    • B29C44/36—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

Landscapes

  • Laminated Bodies (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

PURPOSE:To obtain expansion injection moldings each having a smooth skin of uniform thickness by empolying a thermoplastic expandable resin which is inhibited from expanding under a given pressure and a thermoplastic expandable resin which cannot be inhitibed from expanding and molding them by the short shot method. CONSTITUTION:Two kinds of expandable synthetic resins are injected from the same injection port into a mold cavity, with the first expandable synthetic resin, which is inhibited from expanding under a given pressure, on the outer layer and the second expandable synthetic resin, which is not substantially inhibited from expanding under said pressure, in the center. With the mold cavity filled with a gas having said given pressure, the pressure gas is removed by the expansion of the second resin, and the mold cavity is filled with the resins. The outer layer is kept under unexpanded condition, and the inner part where is not cooled of the first resin expands after the removal of the pressure gas, forming a skin having a uniform thickness.
JP1853480A 1980-02-19 1980-02-19 Expansion injection molding method Granted JPS56115231A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1853480A JPS56115231A (en) 1980-02-19 1980-02-19 Expansion injection molding method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1853480A JPS56115231A (en) 1980-02-19 1980-02-19 Expansion injection molding method

Publications (2)

Publication Number Publication Date
JPS56115231A true JPS56115231A (en) 1981-09-10
JPS6331369B2 JPS6331369B2 (en) 1988-06-23

Family

ID=11974285

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1853480A Granted JPS56115231A (en) 1980-02-19 1980-02-19 Expansion injection molding method

Country Status (1)

Country Link
JP (1) JPS56115231A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010012613A (en) * 2008-07-01 2010-01-21 Sekisui Techno Seikei Kk Injection foaming resin molded article

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010012613A (en) * 2008-07-01 2010-01-21 Sekisui Techno Seikei Kk Injection foaming resin molded article

Also Published As

Publication number Publication date
JPS6331369B2 (en) 1988-06-23

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