FR2112420A1 - Expanded resin sheet - by extruding thermoplastic resin into expansion zone between moving convex and concave surface - Google Patents

Expanded resin sheet - by extruding thermoplastic resin into expansion zone between moving convex and concave surface

Info

Publication number
FR2112420A1
FR2112420A1 FR7139202A FR7139202A FR2112420A1 FR 2112420 A1 FR2112420 A1 FR 2112420A1 FR 7139202 A FR7139202 A FR 7139202A FR 7139202 A FR7139202 A FR 7139202A FR 2112420 A1 FR2112420 A1 FR 2112420A1
Authority
FR
France
Prior art keywords
thermoplastic resin
expansion zone
concave surface
produced
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.)
Granted
Application number
FR7139202A
Other languages
French (fr)
Other versions
FR2112420B1 (en
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.)
Monsanto Chemicals Ltd
Original Assignee
Monsanto Chemicals 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 Monsanto Chemicals Ltd filed Critical Monsanto Chemicals Ltd
Publication of FR2112420A1 publication Critical patent/FR2112420A1/en
Application granted granted Critical
Publication of FR2112420B1 publication Critical patent/FR2112420B1/fr
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
    • B29C44/20—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
    • B29C44/28—Expanding the moulding material on continuous moving surfaces without restricting the upwards growth of the foam
    • 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
    • B29C44/505—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 extruding the compound through a flat die
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets

Landscapes

  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

Expanded thermoplastic resin sheet is produced by extruding an expansible synthetic thermoplastic resin through a die slot into an expansion zone defined by two opposed curved surfaces held at a temp below the extrusion temp. one of the surfaces being a concave surface displacing in the extrusion direction, and the other surface being concave, so that expansion of the resin occurs as it passes through the expansion zone, and the curvature and relative spacing of the surfaces being such that they contact the expanding resin. Smooth finish is produced on the upper and lower faces and tearing of the sheet is avoided. Sheets of different thicknesses, densities and types can be produced.
FR7139202A 1970-11-03 1971-11-02 Expanded resin sheet - by extruding thermoplastic resin into expansion zone between moving convex and concave surface Granted FR2112420A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB5226870 1970-11-03
GB490071 1971-02-18

Publications (2)

Publication Number Publication Date
FR2112420A1 true FR2112420A1 (en) 1972-06-16
FR2112420B1 FR2112420B1 (en) 1974-10-11

Family

ID=26239457

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7139202A Granted FR2112420A1 (en) 1970-11-03 1971-11-02 Expanded resin sheet - by extruding thermoplastic resin into expansion zone between moving convex and concave surface

Country Status (7)

Country Link
AU (1) AU468347B2 (en)
BE (1) BE774778A (en)
CA (1) CA987063A (en)
CH (1) CH537268A (en)
DE (1) DE2154478A1 (en)
FR (1) FR2112420A1 (en)
IT (1) IT942252B (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3060512A (en) * 1955-06-14 1962-10-30 Us Rubber Co Solventless extrusion method for making shaped microporous articles from thermoplastic resinous material

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3060512A (en) * 1955-06-14 1962-10-30 Us Rubber Co Solventless extrusion method for making shaped microporous articles from thermoplastic resinous material

Also Published As

Publication number Publication date
BE774778A (en) 1972-05-02
FR2112420B1 (en) 1974-10-11
DE2154478A1 (en) 1972-06-08
CA987063A (en) 1976-04-13
CH537268A (en) 1973-05-31
IT942252B (en) 1973-03-20
AU3513171A (en) 1973-05-03
AU468347B2 (en) 1976-01-08

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Legal Events

Date Code Title Description
TP Transmission of property
ST Notification of lapse