HOLLOW MOLDED PRODUCT AND PRODUCTION THEREOF

Title:

HOLLOW MOLDED PRODUCT AND PRODUCTION THEREOF

Document Type and Number:

Japanese Patent JPH08323794

Kind Code:

A

Abstract:

PURPOSE: To obtain a hollow molded product reduced in surface appearance inferiority such as surface roughening or glass irregularity and excellent in mold transfer properties by performing gas assist injection molding under specific molding conditions.

CONSTITUTION: A polyacetal resin melted under heating is injected and introduced into a cavity. Next, gas such as nitrogen gas is injected into the molten resin in the cavity from the nozzle of a molding machine or the needle arranged to a part of a mold to obtain a hollow molded product. Gas assist injection molding is performed so as to satisfy formula 210(°C)<CT(°C)<240(°C) [wherein CT(°C) is molding temp. (the temp. of the cylinder of a molding machine)].

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Inventors:

KAWAGUCHI KUNIAKI
YAMAMOTO KAORU
NEZU SHIGERU
YO TSUNEJI

Application Number:

JP13309295A

Publication Date:

December 10, 1996

Filing Date:

May 31, 1995

Export Citation:

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Assignee:

POLYPLASTICS CO

International Classes:

B29C45/00; B29C45/17; B29K69/00; B29L22/00; (IPC1-7): B29C45/00; B29C49/06

Attorney, Agent or Firm:

Kaoru Furuya (3 outside)

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