PRODUCTION OF PRE-EXPANDED THERMOPLASTIC RESIN PARTICLE

Title:

PRODUCTION OF PRE-EXPANDED THERMOPLASTIC RESIN PARTICLE

Document Type and Number:

Japanese Patent JPS6218438

Kind Code:

A

Abstract:

PURPOSE: To obtain efficiently the titled pre-expanded particles with a high expansion ratio, by retaining pre-expanded particles having expandability imparted thereto under pressure within a pressurizing tank, pressure-feeding the particles to metering tanks to pressurize them and pressure-feeding them to a foaming machine to expand them.

CONSTITUTION: The pre-expanded particles of a thermoplastic resin (e.g. polypropylene) having expandability impated thereto be treating it under pressure so as to give particles having an internal pressure of 0.5W10kg/cm2 (G) are fed to a pressurizing tank 1 and retained under a pressure of 1W10kg/m2. The particles are fed to metering tanks 4, 5 having a predetermined internal volume, where the particles are pressurized to 0.5W10kg/cm2 (G). the pre- expanded particles under pressure is pressure-fed to a foaming machine and heated to expand them at a high expansion ratio of 1.5W7 times the initial expansion ratio, thus obtaining the desired pre-expanded thermoplastic resin particles.

Inventors:

KUWABARA HIDEKI
KANBE MASATO
KITAGAWA ATSUSHI

Application Number:

JP15632385A

Publication Date:

January 27, 1987

Filing Date:

July 16, 1985

Export Citation:

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Assignee:

JAPAN STYRENE PAPER CORP

International Classes:

C08J9/22; C08J9/16; (IPC1-7): C08J9/22

Domestic Patent References:

JPS5170264A	1976-06-17
JPS51101072A	1976-09-07
JPS5342789A	1978-04-18

Attorney, Agent or Firm:

Hosoi Isamu

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