GB853944A - Improvements relating to the manufacture of cellular bodies from thermoplastic materials - Google Patents

Improvements relating to the manufacture of cellular bodies from thermoplastic materials

Info

Publication number
GB853944A
GB853944A GB6760/57A GB676057A GB853944A GB 853944 A GB853944 A GB 853944A GB 6760/57 A GB6760/57 A GB 6760/57A GB 676057 A GB676057 A GB 676057A GB 853944 A GB853944 A GB 853944A
Authority
GB
United Kingdom
Prior art keywords
composition
pressure
weight
parts
mould
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
GB6760/57A
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.)
Lonza Electric and Chemical Works Ltd
Original Assignee
Lonza Electric and Chemical Works 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 Lonza Electric and Chemical Works Ltd filed Critical Lonza Electric and Chemical Works Ltd
Publication of GB853944A publication Critical patent/GB853944A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B30B15/24—Control arrangements for fluid-driven presses controlling the movement of a plurality of actuating members to maintain parallel movement of the platen or press beam
    • B30B15/245—Control arrangements for fluid-driven presses controlling the movement of a plurality of actuating members to maintain parallel movement of the platen or press beam using auxiliary cylinder and piston means as actuating members
    • 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
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/10—Applying counter-pressure during expanding
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/30—Mounting, exchanging or centering

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

Cellular bodies having closed cells are produced from gas-containing thermoplastic compositions by heating the composition under pressure to gelling temperature in moulds, cooling the composition while maintaining the pressure, releasing the pressure, removing the bodies and fully expanding them. In one example 50 parts by weight of polyvinyl chloride, 50 parts by weight of dioctyl phthalate and 20 parts by weight of methyl ethyl ketone are placed in a mould and nitrogen under pressure introduced. Pressure is then applied to the mould by a plunger and the composition is heated, gelled, and expanded. Other suitable thermoplastic compounds are stated to be polystyrene and its copolymers, and cellulose acetate. Blowing agents in the composition such as azoaminobenzene or azoisobutyric acid dinitrile may be used in place of the nitrogen. The gelled composition may be partially expanded in the mould before cooling. Specifications 694,964 and 745,248 are referred to.
GB6760/57A 1956-03-13 1957-02-28 Improvements relating to the manufacture of cellular bodies from thermoplastic materials Expired GB853944A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH853944X 1956-03-13

Publications (1)

Publication Number Publication Date
GB853944A true GB853944A (en) 1960-11-16

Family

ID=4542528

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6760/57A Expired GB853944A (en) 1956-03-13 1957-02-28 Improvements relating to the manufacture of cellular bodies from thermoplastic materials

Country Status (4)

Country Link
CH (1) CH344840A (en)
FR (1) FR1173241A (en)
GB (1) GB853944A (en)
NL (2) NL110101C (en)

Also Published As

Publication number Publication date
NL110101C (en)
FR1173241A (en) 1959-02-23
CH344840A (en) 1960-02-29
NL215239A (en)

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