JPS6445607A - Method for preexpanding expandable thermoplastic resin particle - Google Patents
Method for preexpanding expandable thermoplastic resin particleInfo
- Publication number
- JPS6445607A JPS6445607A JP30435087A JP30435087A JPS6445607A JP S6445607 A JPS6445607 A JP S6445607A JP 30435087 A JP30435087 A JP 30435087A JP 30435087 A JP30435087 A JP 30435087A JP S6445607 A JPS6445607 A JP S6445607A
- Authority
- JP
- Japan
- Prior art keywords
- tank
- particles
- pressure
- expansion tank
- 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
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 rationalize the aging during forming and to increase the efficiency of forming operation by a method wherein air is rapidly infiltrated in expanding particles by positively introducing hot air in an expansion tank before the expanding particles are taken out of the expansion tank after the finish of the preexpansion of the particles in the expansion tank during the preexpansion. CONSTITUTION:Pre-method expandable thermoplastic resin particles are fed from a hopper 8 to an 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 100-500mmHg, 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 value 4 is opened and the resultant preexpanded particles are taken out of the tank.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30435087A JPS6445607A (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 |
---|---|---|---|
JP30435087A JPS6445607A (en) | 1987-11-30 | 1987-11-30 | Method for preexpanding expandable thermoplastic resin particle |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6445607A true JPS6445607A (en) | 1989-02-20 |
Family
ID=17931957
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP30435087A Pending JPS6445607A (en) | 1987-11-30 | 1987-11-30 | Method for preexpanding expandable thermoplastic resin particle |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6445607A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6445606A (en) * | 1987-11-30 | 1989-02-20 | Kanegafuchi Chemical Ind | Method for preexpanding expandable thermoplastic resin particle |
CN112440403A (en) * | 2019-08-30 | 2021-03-05 | 株式会社钟化 | Apparatus and method for producing expanded beads |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6445606A (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 |
-
1987
- 1987-11-30 JP JP30435087A patent/JPS6445607A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6445606A (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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6445606A (en) * | 1987-11-30 | 1989-02-20 | Kanegafuchi Chemical Ind | Method for preexpanding expandable thermoplastic resin particle |
CN112440403A (en) * | 2019-08-30 | 2021-03-05 | 株式会社钟化 | Apparatus and method for producing expanded beads |
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