JPS57126632A - Method and apparatus for extrusion foaming - Google Patents

Method and apparatus for extrusion foaming

Info

Publication number
JPS57126632A
JPS57126632A JP56011522A JP1152281A JPS57126632A JP S57126632 A JPS57126632 A JP S57126632A JP 56011522 A JP56011522 A JP 56011522A JP 1152281 A JP1152281 A JP 1152281A JP S57126632 A JPS57126632 A JP S57126632A
Authority
JP
Japan
Prior art keywords
resin
layer part
slit
resin passage
outer layer
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
JP56011522A
Other languages
Japanese (ja)
Inventor
Kiyohisa Kezuka
Seiya Iida
Tadayoshi Kato
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.)
Eneos Corp
Original Assignee
Nippon Petrochemicals 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 Nippon Petrochemicals Co Ltd filed Critical Nippon Petrochemicals Co Ltd
Priority to JP56011522A priority Critical patent/JPS57126632A/en
Publication of JPS57126632A publication Critical patent/JPS57126632A/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
    • B29C44/20—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length
    • B29C44/22—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length consisting of at least two parts of chemically or physically different materials, e.g. having different densities
    • 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
    • B29C44/46—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length
    • B29C44/50—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length using pressure difference, e.g. by extrusion or by spraying

Landscapes

  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

PURPOSE:To obtain a form having the outer layer part of high density and the inner layer part of low density by a method wherein a resin passage for providing the inner layer part of the form and a plurality of slit resin passages for providing the outer layer part are laid in the drawing part in a die in an extruding machine. CONSTITUTION:When a mixture of thermoplastic synthetic resin and foaming agent melted and mixed in the extruding machine is dischanged through the drawing part laid in the resin passage in the die, projections through which a resin passage 2 forming the inner layer part of the molded part and a plurality of slit resin passages 1 forming the outer layer part are connected is used in the drawing part. In this manner, since the slit resin passage 1 is provided in the longitudinal direction, foaming resin discharged from this part reaches the surface layer of the form quickly, cooled and hardened before each foam grows enough, and forms the surface layer of high density.
JP56011522A 1981-01-30 1981-01-30 Method and apparatus for extrusion foaming Pending JPS57126632A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56011522A JPS57126632A (en) 1981-01-30 1981-01-30 Method and apparatus for extrusion foaming

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56011522A JPS57126632A (en) 1981-01-30 1981-01-30 Method and apparatus for extrusion foaming

Publications (1)

Publication Number Publication Date
JPS57126632A true JPS57126632A (en) 1982-08-06

Family

ID=11780302

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56011522A Pending JPS57126632A (en) 1981-01-30 1981-01-30 Method and apparatus for extrusion foaming

Country Status (1)

Country Link
JP (1) JPS57126632A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013255868A (en) * 2012-06-11 2013-12-26 Inoac Corp Filter medium for filter treatment, and method for manufacturing the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013255868A (en) * 2012-06-11 2013-12-26 Inoac Corp Filter medium for filter treatment, and method for manufacturing the same

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