JPS57199634A - Method of pre-foaming foamable thermoplastic resin particle - Google Patents

Method of pre-foaming foamable thermoplastic resin particle

Info

Publication number
JPS57199634A
JPS57199634A JP56084109A JP8410981A JPS57199634A JP S57199634 A JPS57199634 A JP S57199634A JP 56084109 A JP56084109 A JP 56084109A JP 8410981 A JP8410981 A JP 8410981A JP S57199634 A JPS57199634 A JP S57199634A
Authority
JP
Japan
Prior art keywords
foaming
steam
foaming tank
blowing
foamed
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
JP56084109A
Other languages
Japanese (ja)
Other versions
JPS6241442B2 (en
Inventor
Toshio Sugawara
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.)
Sekisui Kaseihin Kogyo KK
Sekisui Kasei Co Ltd
Original Assignee
Sekisui Plastics Co Ltd
Sekisui Kaseihin Kogyo KK
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 Sekisui Plastics Co Ltd, Sekisui Kaseihin Kogyo KK filed Critical Sekisui Plastics Co Ltd
Priority to JP56084109A priority Critical patent/JPS57199634A/en
Publication of JPS57199634A publication Critical patent/JPS57199634A/en
Publication of JPS6241442B2 publication Critical patent/JPS6241442B2/ja
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
    • B29C44/34—Auxiliary operations
    • B29C44/3461—Making or treating expandable particles

Landscapes

  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

PURPOSE:To produce highly foamed particles uniformly in a short period, by carrying out the blowing of a heating medium when pre-foaming is effected in such a way that an internal pressure is exerted in a foaming tank. CONSTITUTION:Foamable polystyrene resin particles containing 8% of butane as a foaming agent are introduced from a hopper 3 into the foaming tank 1. A low pressure steam is blown into the foaming tank 1, a discharge vavle 64 is closed, the blowing of steam is continued with the foaming tank 1 closed, and the resin particles are foamed with the internal pressure of the foaming tank 1 retained at 0.01-0.05kg/cm<2>. When the top surface of the foamed particle layer reaches a first detector 81, the blowing of steam is stopped, the discharge valve 64 is opened, and then blowing of steam is resumed with the foaming tank 1 being open to the atmosphere, and when the top surface in the foaming tank reaches a second detector 82, the supply of steam is stopped and the foamed particles are obtained.
JP56084109A 1981-06-01 1981-06-01 Method of pre-foaming foamable thermoplastic resin particle Granted JPS57199634A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56084109A JPS57199634A (en) 1981-06-01 1981-06-01 Method of pre-foaming foamable thermoplastic resin particle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56084109A JPS57199634A (en) 1981-06-01 1981-06-01 Method of pre-foaming foamable thermoplastic resin particle

Publications (2)

Publication Number Publication Date
JPS57199634A true JPS57199634A (en) 1982-12-07
JPS6241442B2 JPS6241442B2 (en) 1987-09-03

Family

ID=13821351

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56084109A Granted JPS57199634A (en) 1981-06-01 1981-06-01 Method of pre-foaming foamable thermoplastic resin particle

Country Status (1)

Country Link
JP (1) JPS57199634A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5865635A (en) * 1981-10-14 1983-04-19 Hitachi Chem Co Ltd Manufacture of prefoamed styrene resin particle
FR2632563A1 (en) * 1988-06-13 1989-12-15 Garacci Patrice Pre-expander machine intended for expanding particles used especially in packaging, including a start-of-moulding detector and safety means

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS565176A (en) * 1979-06-26 1981-01-20 Multi Koken Kk Separation and removal of oils

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS565176A (en) * 1979-06-26 1981-01-20 Multi Koken Kk Separation and removal of oils

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5865635A (en) * 1981-10-14 1983-04-19 Hitachi Chem Co Ltd Manufacture of prefoamed styrene resin particle
JPS6220221B2 (en) * 1981-10-14 1987-05-06 Hitachi Chemical Co Ltd
FR2632563A1 (en) * 1988-06-13 1989-12-15 Garacci Patrice Pre-expander machine intended for expanding particles used especially in packaging, including a start-of-moulding detector and safety means

Also Published As

Publication number Publication date
JPS6241442B2 (en) 1987-09-03

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