GB1254559A - Production of foamed resins - Google Patents

Production of foamed resins

Info

Publication number
GB1254559A
GB1254559A GB48239/68A GB4823968A GB1254559A GB 1254559 A GB1254559 A GB 1254559A GB 48239/68 A GB48239/68 A GB 48239/68A GB 4823968 A GB4823968 A GB 4823968A GB 1254559 A GB1254559 A GB 1254559A
Authority
GB
United Kingdom
Prior art keywords
zone
die
weight
slit
blowing agent
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.)
Expired
Application number
GB48239/68A
Inventor
John Harold Gilbert
Sen Durgacharan
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
Priority to GB48239/68A priority Critical patent/GB1254559A/en
Priority to DE19691950592 priority patent/DE1950592B2/en
Publication of GB1254559A publication Critical patent/GB1254559A/en
Expired 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
    • B29C44/46—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

Abstract

1,254,559. Extrusion moulding foamed resins. MONSANTO CHEMICALS Ltd. 15 Sept., 1969 [11 Oct., 1968], No. 48239/68. Heading B5A. In the production of a foamed resin sheet a foamable composition is extruded through a slit die having a first zone 3 in which the required back pressure is set up, a second zone comprising a restriction 4 and having a relatively short land and a third zone 5 substantially without any internal obstruction and diverging to form the slit orifice. As shown, first zone 3 is defined by parallel opposing faces of die parts 1 and 2. Alternatively, this zone may converge in the direction of extrusion, see Figs. 4 and 5 (not reproduced). Second zone 4 preferably has a converging portion leading to the restriction when first zone 3 is parallel faced, but otherwise is preferably parallel faced as at (102), Figs. 4 and 5 (not shown). The faces of third zone 5 may be convex to the die axis as at (104, 105), Figs 4 and 5 (not shown). The extruded resin preferably passes through a pair of rollers, possibly spring urged together, whose nip is somewhat less than the final thickness of the sheet. The slit gap may vary over the width of the slit. The die is temperature controlled by passage of fluid, e.g. oil, water or steam through passages 14. Numerous resins are listed, those most preferred being low density polyethylene, polypropylene, polystyrene and a copolymer of ethylene and vinyl acetate. Also listed are blowing and muleating agents. Ranges of dimensions for the die are given and in examples, specific dimensions are given and the following mixtures of materials; polyethylene or a copolymer of ethylene and vinyl acetate with 1% by weight of powdered anhydrous calcium: acetate and nitrogen as a blowing agent, the same resins with 0À1% by weight of citric acid, 0À2% by weight of sodium bicarbonate and butane as blowing agent and polyethylene with 1% by weight of powdered talc and nitrogen as blowing agent.
GB48239/68A 1968-10-11 1968-10-11 Production of foamed resins Expired GB1254559A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB48239/68A GB1254559A (en) 1968-10-11 1968-10-11 Production of foamed resins
DE19691950592 DE1950592B2 (en) 1968-10-11 1969-10-07 DEVICE FOR THE SIMULTANEOUS EXTRUDING AND FOAMING OF PLASTIC TO A PLASTIC WEB

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB48239/68A GB1254559A (en) 1968-10-11 1968-10-11 Production of foamed resins

Publications (1)

Publication Number Publication Date
GB1254559A true GB1254559A (en) 1971-11-24

Family

ID=10447870

Family Applications (1)

Application Number Title Priority Date Filing Date
GB48239/68A Expired GB1254559A (en) 1968-10-11 1968-10-11 Production of foamed resins

Country Status (2)

Country Link
DE (1) DE1950592B2 (en)
GB (1) GB1254559A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2444557A1 (en) * 1978-12-21 1980-07-18 Du Pont PROCESS AND APPARATUS FOR PRESS EXTRUSION OF POLYIMIDE RESINS AND AROMATIC POLYAMIDES AND SHAPED ARTICLES FORMED USING THIS PROCESS AND APPARATUS

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19946523C2 (en) * 1999-09-28 2002-10-24 Gefinex Jackon Gmbh Process and device for the production of plastic foam strands of great thickness
KR102164729B1 (en) * 2019-08-05 2020-10-14 강현식 A process for preparing co-extruded lamination sheet for packing tray

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2444557A1 (en) * 1978-12-21 1980-07-18 Du Pont PROCESS AND APPARATUS FOR PRESS EXTRUSION OF POLYIMIDE RESINS AND AROMATIC POLYAMIDES AND SHAPED ARTICLES FORMED USING THIS PROCESS AND APPARATUS

Also Published As

Publication number Publication date
DE1950592B2 (en) 1976-04-22
DE1950592A1 (en) 1970-11-05

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