JPS6445606A - Method for preexpanding expandable thermoplastic resin particle - Google Patents

Method for preexpanding expandable thermoplastic resin particle

Info

Publication number
JPS6445606A
JPS6445606A JP30434987A JP30434987A JPS6445606A JP S6445606 A JPS6445606 A JP S6445606A JP 30434987 A JP30434987 A JP 30434987A JP 30434987 A JP30434987 A JP 30434987A JP S6445606 A JPS6445606 A JP S6445606A
Authority
JP
Japan
Prior art keywords
tank
pressure
expansion
particles
state
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.)
Pending
Application number
JP30434987A
Other languages
Japanese (ja)
Inventor
Tamotsu Kawai
Akiyoshi Sugimoto
Kinzo Masuda
Takeshi Tanaka
Kazuhiro Tsuneto
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.)
Kanegafuchi Chemical Industry Co Ltd
Original Assignee
Kanegafuchi Chemical Industry Co 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 Kanegafuchi Chemical Industry Co Ltd filed Critical Kanegafuchi Chemical Industry Co Ltd
Priority to JP30434987A priority Critical patent/JPS6445606A/en
Publication of JPS6445606A publication Critical patent/JPS6445606A/en
Pending legal-status Critical Current

Links

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 contrive to improve the dimensional accuracy after secondary molding and to accelerate the rationalization of molding during curing by a method wherein expansion is further accelerated by the difference between the pressure in a tank and that in expanding particles developed by precipitously reducing the pressure in the tank to the specified pressure or less after the finish of the predetermined expansion during the expansion by heating. CONSTITUTION:Pre-metered expandable thermoplastic resin particles are fed from a hopper 8 to a expansion tank 1 and, after that, hot air is introduced in the expansion tank 1. After the pressure in the tank is reduced to the predetermined vacuum, steam is continuously flowed in the tank so as to raise the pressure in the tank in order to keep the interior of the tank within a certain pressure range. Under the state just mentioned above, resin particles continue to expand in the expansion tank up to the predetermined volume. After that, the interior of the tank is put under enclosed state and evacuated so as to discharge the steam stagnant in the tank in order to dry the particles. After the evacuation to the specified vacuum or 50-760mm Hg, hot air is fed in the tank so as to bring again the interior of the tank into the pressurized state and keep said state for a certain period of time in order to rapidly infiltrate air in the expanding particles. Finally, the pressure in the tank is brought back to atmospheric pressure and a discharge valve 4 is opened and the resultant preexpanded particles are taken out of the tank.
JP30434987A 1987-11-30 1987-11-30 Method for preexpanding expandable thermoplastic resin particle Pending JPS6445606A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP30434987A JPS6445606A (en) 1987-11-30 1987-11-30 Method for preexpanding expandable thermoplastic resin particle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP30434987A JPS6445606A (en) 1987-11-30 1987-11-30 Method for preexpanding expandable thermoplastic resin particle

Publications (1)

Publication Number Publication Date
JPS6445606A true JPS6445606A (en) 1989-02-20

Family

ID=17931944

Family Applications (1)

Application Number Title Priority Date Filing Date
JP30434987A Pending JPS6445606A (en) 1987-11-30 1987-11-30 Method for preexpanding expandable thermoplastic resin particle

Country Status (1)

Country Link
JP (1) JPS6445606A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6445607A (en) * 1987-11-30 1989-02-20 Kanegafuchi Chemical Ind Method for preexpanding expandable thermoplastic resin particle
KR100341777B1 (en) * 2000-02-08 2002-06-24 정문조 Continuous Process for Production Methood of Polyolefin Foam Beads

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6445607A (en) * 1987-11-30 1989-02-20 Kanegafuchi Chemical Ind Method for preexpanding expandable thermoplastic resin particle
JPH0684453A (en) * 1992-02-05 1994-03-25 Motorola Inc Electronic device using electric-field emitting device having different kind of electron emitting characteristic and realizing method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6445607A (en) * 1987-11-30 1989-02-20 Kanegafuchi Chemical Ind Method for preexpanding expandable thermoplastic resin particle
JPH0684453A (en) * 1992-02-05 1994-03-25 Motorola Inc Electronic device using electric-field emitting device having different kind of electron emitting characteristic and realizing method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6445607A (en) * 1987-11-30 1989-02-20 Kanegafuchi Chemical Ind Method for preexpanding expandable thermoplastic resin particle
KR100341777B1 (en) * 2000-02-08 2002-06-24 정문조 Continuous Process for Production Methood of Polyolefin Foam Beads

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