GB1230992A - - Google Patents

Info

Publication number
GB1230992A
GB1230992A GB1230992DA GB1230992A GB 1230992 A GB1230992 A GB 1230992A GB 1230992D A GB1230992D A GB 1230992DA GB 1230992 A GB1230992 A GB 1230992A
Authority
GB
United Kingdom
Prior art keywords
pressure
blowing agent
thermoplastic polymer
region
terminal section
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
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 filed Critical
Publication of GB1230992A publication Critical patent/GB1230992A/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
    • B29C44/3442—Mixing, kneading or conveying the foamable material
    • B29C44/3446—Feeding the blowing agent
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent

Abstract

1,230,992. Extruding expanded material. IMPERIAL CHEMICAL INDUSTRIES Ltd. 29 Oct., 1968 [4 Aug., 1967], No. 35975/67. Addition to 1,220,053. Heading B5A. [Also in Division C3] A foamed thermoplastic polymer is made in an apparatus which comprises an extruder, the screw or screws of which are divided into at least one non-terminal section bounded at both feed and delivery ends by a gas- and liquid-tight plug and a terminal section bounded at the feed end by a gas- and liquid-tight plug and at the delivery end by the extrusion die, the delivery end of each non-terminal section being connected to the feed end of the next section by a by-pass duct, each of said sections comprising a region of relatively low pressure at the feed end and a region of relatively high pressure at the delivery end in which means for the injection of a blowing agent is provided either within said region of relatively low pressure of said non-terminal section or sections, or within the by-pass duct adjacent thereto and in which said extrusion die is so constructed that a pressure at least equal to the pressure at which said blowing agent was injected is substantially maintained up to the die lips. The extruder may have a single screw having a maximum pitch or depth which is varied along its length so that successive sections, each comprising a region of relatively low compression followed by a region of relatively high compression, are formed along the length of the barrel. In the Figure a screw 2 rotates in barrel 1 and is screwed together within gas- and liquid-tight plugs 3 which form regions of low, 6, and high, 7, compression: blowing agent is injected at 9 and 10 and also 11 and 12; 13 being an annular die. The foamed thermoplastic polymer is made by releasing the pressure from a pressurized extruder containing homogeneous mixture of the molten thermoplastic polymer and a blowing agent system which comprises a first blowing agent which is completely miscible with the molten thermoplastic polymer at the said pressure and which has a boiling point at least 10‹ C. below the temperature at which the pressure is released from the homogeneous mixture and a second different blowing agent which has a solubility of at least 0À01% by weight in the thermoplastic polymer and a critical temperature less than the temperature of the homogeneous mixture at the point when said pressure is released and in which the pressure of the second blowing agent within the molten thermoplastic polymer is maintained at least at the value at which it was introduced into the thermoplastic polymer until immediately before the pressure is released and very intimate mixing of the blowing agent system and the molten polymer is carried out.
GB1230992D 1967-08-04 1967-08-04 Expired GB1230992A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3597567 1967-08-04

Publications (1)

Publication Number Publication Date
GB1230992A true GB1230992A (en) 1971-05-05

Family

ID=10383569

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1230992D Expired GB1230992A (en) 1967-08-04 1967-08-04

Country Status (1)

Country Link
GB (1) GB1230992A (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2350946A1 (en) * 1976-05-10 1977-12-09 Berstorff Gmbh Masch Hermann PROCESS FOR PREPARING EXTRUDED SHEETS IN POLYSTYRENE FOAM SHEATH
GB2233929A (en) * 1989-06-28 1991-01-23 Berstorff Gmbh Masch Hermann A method and apparatus for extruding thermoplastic plastics material foamed by steam
EP0464581A2 (en) * 1990-07-04 1992-01-08 BASF Aktiengesellschaft Process for producing foam panels having a high compression strength
EP0493110A2 (en) * 1990-12-26 1992-07-01 The Furukawa Electric Co., Ltd. Method of producing foamed polyolefin shaped body and method of producing foam-insulated electric cable having the shaped body as foam insulating layer
US5244927A (en) * 1992-06-09 1993-09-14 The Dow Chemical Company Low density styrene polymer foams and process for preparing same
US5274005A (en) * 1992-06-09 1993-12-28 The Dow Chemical Company Low density styrene polymer foams and process for preparing same
US5391335A (en) * 1990-12-26 1995-02-21 The Furukawa Electric Co., Ltd. Method of producing a foam-insulated electric wire using a blowing agent mixture
WO1996011097A1 (en) * 1994-10-11 1996-04-18 The Dow Chemical Company Foam made with downstream injection of water
US6572800B1 (en) 1999-01-20 2003-06-03 Poliglas, S.A. Process and apparatus for producing foam
EP2260997A3 (en) * 2002-10-28 2013-04-10 Trexel Inc. Method of dosing the blowing agent
WO2015017089A1 (en) * 2013-08-02 2015-02-05 Nike Innovate C.V. Low density foamed articles and methods for making
US9919458B2 (en) 2013-08-02 2018-03-20 Nike, Inc. Method and thermoplastic foamed article

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2350946A1 (en) * 1976-05-10 1977-12-09 Berstorff Gmbh Masch Hermann PROCESS FOR PREPARING EXTRUDED SHEETS IN POLYSTYRENE FOAM SHEATH
GB2233929A (en) * 1989-06-28 1991-01-23 Berstorff Gmbh Masch Hermann A method and apparatus for extruding thermoplastic plastics material foamed by steam
GB2233929B (en) * 1989-06-28 1993-04-28 Berstorff Gmbh Masch Hermann A method and apparatus for extruding a thermoplastic plastics material foam
EP0464581A2 (en) * 1990-07-04 1992-01-08 BASF Aktiengesellschaft Process for producing foam panels having a high compression strength
EP0464581A3 (en) * 1990-07-04 1992-03-25 Basf Aktiengesellschaft Process for producing foam panels having a high compression strength
EP0493110A2 (en) * 1990-12-26 1992-07-01 The Furukawa Electric Co., Ltd. Method of producing foamed polyolefin shaped body and method of producing foam-insulated electric cable having the shaped body as foam insulating layer
EP0493110A3 (en) * 1990-12-26 1992-12-02 The Furukawa Electric Co., Ltd. Method of producing foamed polyolefin shaped body and method of producing foam-insulated electric cable having the shaped body as foam insulating layer
US5391335A (en) * 1990-12-26 1995-02-21 The Furukawa Electric Co., Ltd. Method of producing a foam-insulated electric wire using a blowing agent mixture
US5274005A (en) * 1992-06-09 1993-12-28 The Dow Chemical Company Low density styrene polymer foams and process for preparing same
US5244927A (en) * 1992-06-09 1993-09-14 The Dow Chemical Company Low density styrene polymer foams and process for preparing same
WO1996011097A1 (en) * 1994-10-11 1996-04-18 The Dow Chemical Company Foam made with downstream injection of water
EP0887167A1 (en) * 1994-10-11 1998-12-30 The Dow Chemical Company Foam made with downstream injection of water
US6572800B1 (en) 1999-01-20 2003-06-03 Poliglas, S.A. Process and apparatus for producing foam
EP2260997A3 (en) * 2002-10-28 2013-04-10 Trexel Inc. Method of dosing the blowing agent
WO2015017089A1 (en) * 2013-08-02 2015-02-05 Nike Innovate C.V. Low density foamed articles and methods for making
US9919458B2 (en) 2013-08-02 2018-03-20 Nike, Inc. Method and thermoplastic foamed article
US9963566B2 (en) 2013-08-02 2018-05-08 Nike, Inc. Low density foamed articles and methods for making
US10232533B2 (en) 2013-08-02 2019-03-19 Nike, Inc. Method and thermoplastic foamed article

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee