Title:
PRELIMINARILY FOAMED GRANULE OF THERMOPLASTIC RESIN AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JPH0711041
Kind Code:
A
Abstract:
PURPOSE: To provide a new method for producing the preliminarily foamed granules of a thermoplastic resin, omitting a conventional foaming agent- impregnating process.
CONSTITUTION: This method for producing preliminarily foamed polyethylene granules comprises melting a thermoplastic resin such as a polyolefinic resin or polyester resin with an extruder, mixing the melted product with a foaming agent, cooling the mixture, extruding the cooled mixture, foaming the extruded product so as to give an expanded diameter of 1.5-10.5 times the diameter of the nozzle of the extrusion die, and cutting the foamed product before or after the finishing of the foaming.
Inventors:
TSUBONE TADAYASU
Application Number:
JP15047493A
Publication Date:
January 13, 1995
Filing Date:
June 22, 1993
Export Citation:
Assignee:
SEKISUI PLASTICS
International Classes:
B29B11/10; C08J9/16; B29K23/00; B29K67/00; B29K105/04; (IPC1-7): C08J9/16; B29B11/10
Domestic Patent References:
| JPS61113627A | 1986-05-31 | |||
| JPS59221340A | 1984-12-12 |
Attorney, Agent or Firm:
Hiroshi Tanaka (1 outside)
Next Patent: PREPARATION OF POLYOLEFIN FOAM PARTICLE