GB1289863A - - Google Patents

Info

Publication number
GB1289863A
GB1289863A GB1289863DA GB1289863A GB 1289863 A GB1289863 A GB 1289863A GB 1289863D A GB1289863D A GB 1289863DA GB 1289863 A GB1289863 A GB 1289863A
Authority
GB
United Kingdom
Prior art keywords
die
portions
relatively
foamed
oct
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 GB1289863A publication Critical patent/GB1289863A/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
    • B29C44/468—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length in a plurality of parallel streams which unite during the foaming
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/695—Flow dividers, e.g. breaker plates
    • B29C48/70—Flow dividers, e.g. breaker plates comprising means for dividing, distributing and recombining melt flows

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

1289863 Extruding foamed plastics ASAHI KASEI KOGYO KK 13 Oct 1969 [21 Oct 1968] 50140/69 Heading B5A Extruded foamed thermoplastic articles having longitudinally extending portions of differing density, i.e. portions which are non- foamed or where relatively little foaming has taken place, are made using an extrusion die having two or more material-flow passages, at least one of which allows a degree of expansion of resin therein different to that for resin in another passage. The denser portions are formed by applying a relatively greater pressure and/or a relatively lower temperature and additionally the material forming the portions may be degassed, e.g. by using a die having passage(s) of sintered metal. In the embodiment of Fig. 1, pressure differences in passages 4, 5 are obtained by the provision of upstream conduits 7, 8 of different diameters. In a second embodiment, Fig. 2 (not shown), conduits 8 are at the downstream end of the die and further embodiments, Figs. 3-7 (not shown), describe the formation of annular, U-cross section and plate-like relatively unfoamed portions. Cooling of the die is preferably adjacent or towards its downstream end and the die may be associated with a cooled sizing die. Thermoplastic polymers specifically mentioned are, polyethylene, polypropylene, polystyrene, P.V.C. copolymers and A.B.S. copolymers.
GB1289863D 1968-10-21 1969-10-13 Expired GB1289863A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7606868 1968-10-21

Publications (1)

Publication Number Publication Date
GB1289863A true GB1289863A (en) 1972-09-20

Family

ID=13594445

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1289863D Expired GB1289863A (en) 1968-10-21 1969-10-13

Country Status (3)

Country Link
DE (1) DE1952753C3 (en)
FR (1) FR2021162A1 (en)
GB (1) GB1289863A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2015190A1 (en) * 1970-03-28 1971-10-21 Huels Chemische Werke Ag Method and device for the continuous production of profiles with a foam core and a shell made of thermoplastic material
JPS491428Y1 (en) * 1970-06-26 1974-01-14
JPS534229Y2 (en) * 1972-03-07 1978-02-02
JPS534228Y2 (en) * 1972-03-07 1978-02-02
US4185060A (en) * 1978-03-17 1980-01-22 Ladney M Jr Method of manufacturing structural foam plastic products free from undesirable contaminant constituents

Also Published As

Publication number Publication date
DE1952753C3 (en) 1976-01-08
DE1952753B2 (en) 1973-04-19
DE1952753A1 (en) 1970-05-21
FR2021162A1 (en) 1970-07-17

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee