JPS57105323A - Method for molding synthetic resin - Google Patents

Method for molding synthetic resin

Info

Publication number
JPS57105323A
JPS57105323A JP55181364A JP18136480A JPS57105323A JP S57105323 A JPS57105323 A JP S57105323A JP 55181364 A JP55181364 A JP 55181364A JP 18136480 A JP18136480 A JP 18136480A JP S57105323 A JPS57105323 A JP S57105323A
Authority
JP
Japan
Prior art keywords
mold
cavity
injected
inert gas
resin
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
JP55181364A
Other languages
Japanese (ja)
Inventor
Takao Iwata
Tatsuya Tamura
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.)
Hashimoto Forming Industry Co Ltd
Original Assignee
Hashimoto Forming 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 Hashimoto Forming Industry Co Ltd filed Critical Hashimoto Forming Industry Co Ltd
Priority to JP55181364A priority Critical patent/JPS57105323A/en
Publication of JPS57105323A publication Critical patent/JPS57105323A/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
    • B29C44/34—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
    • 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
    • B29C44/0415—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 regulating the pressure of the material during or after filling of the mould, e.g. by local venting
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • B29K2105/043—Skinned foam

Abstract

PURPOSE:To mold an article having a foamed layer by using only one molding machine by a method wherein a molten resin containing a foaming agent is injected into a mold the interior of which is pressurized with an inert gas, and then a slide core is retracted to reduce the pressure. CONSTITUTION:A cavity mold 3 and a core mold 4 are clamped to each other, the slide core mold 5 is advanced to project into the cavity 6, and then an inert gas is charged into the cavity 6 at a pressure sufficiently high to prevent the foaming of the resin injected into the cavity 6. Then, while gradually discharging the inert gas, the molten resin 10 containing the foaming agent is injected into the cavity 6, and when a skin layer is formed at the part contacting with the mold, the inside molten part of the resin is foamed by retractong the slide core mold 5. Accordingly, a molded article having a foamed layer can be obtained easily and by a smaller number of steps unsing only one molding machine.
JP55181364A 1980-12-23 1980-12-23 Method for molding synthetic resin Pending JPS57105323A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55181364A JPS57105323A (en) 1980-12-23 1980-12-23 Method for molding synthetic resin

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55181364A JPS57105323A (en) 1980-12-23 1980-12-23 Method for molding synthetic resin

Publications (1)

Publication Number Publication Date
JPS57105323A true JPS57105323A (en) 1982-06-30

Family

ID=16099425

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55181364A Pending JPS57105323A (en) 1980-12-23 1980-12-23 Method for molding synthetic resin

Country Status (1)

Country Link
JP (1) JPS57105323A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63179720A (en) * 1987-01-20 1988-07-23 Honda Motor Co Ltd Injection compression molding method and molding machine
JP2005324423A (en) * 2004-05-13 2005-11-24 Toyoda Gosei Co Ltd Manufacturing method of foamed molded product
JP2007030475A (en) * 2005-07-29 2007-02-08 Daikyoo Nishikawa Kk Resin molding, its manufacturing process and automobile door
JP2020006527A (en) * 2018-07-03 2020-01-16 三恵技研工業株式会社 Automotive member and method of manufacturing the same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5415299A (en) * 1977-06-30 1979-02-05 Sperry Rand Corp Automatic pilot with watchable multichannel
JPS556052A (en) * 1978-06-30 1980-01-17 Bridgestone Cycle Co Brake device for vehicle

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5415299A (en) * 1977-06-30 1979-02-05 Sperry Rand Corp Automatic pilot with watchable multichannel
JPS556052A (en) * 1978-06-30 1980-01-17 Bridgestone Cycle Co Brake device for vehicle

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63179720A (en) * 1987-01-20 1988-07-23 Honda Motor Co Ltd Injection compression molding method and molding machine
JP2005324423A (en) * 2004-05-13 2005-11-24 Toyoda Gosei Co Ltd Manufacturing method of foamed molded product
JP2007030475A (en) * 2005-07-29 2007-02-08 Daikyoo Nishikawa Kk Resin molding, its manufacturing process and automobile door
JP2020006527A (en) * 2018-07-03 2020-01-16 三恵技研工業株式会社 Automotive member and method of manufacturing the same

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