METHOD FOR MANUFACTURING FOAMABLE INJECTION MOLDING AND INJECTION DEVICE THEREFOR

Title:

METHOD FOR MANUFACTURING FOAMABLE INJECTION MOLDING AND INJECTION DEVICE THEREFOR

Document Type and Number:

WIPO Patent Application WO/2014/132598

Kind Code:

A1

Abstract:

Foamable injection moldings are manufactured by performing a plasticizing process, a transfer process, and an injection process, and repeating said processes. In the plasticizing process, a plasticized molten resin impregnated with a foaming gas is fed to the tip of a heating cylinder (20) by a screw (21) rotating inside the heating cylinder (20) and the screw (21) moves backward as the molten resin accumulates in the tip of the heating cylinder (20). In the transfer process, the screw (21) moves forward while rotating to deliver the molten resin accumulated in the tip of the heating cylinder (20) from the plasticizing unit (2) to an injection unit (3). The injection process injects the molten resin from the injection unit (3). As a result, when injection-molding a foamable injection molding impregnated with foaming gas, plasticization of the material resin during the forming cycle and impregnation of the foaming gas into the plasticized molten resin are improved and productivity can be improved.

Inventors:

NAKATANI TOYOHIKO (JP)
ICHIKAWA KENTAROU (JP)
TANAKA HIDEO (JP)
SATO KAZUHITO (JP)
LEVI KISHBAUGH (US)

Application Number:

PCT/JP2014/000876

Publication Date:

September 04, 2014

Filing Date:

February 20, 2014

Export Citation:

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Assignee:

TOYO SEIKAN GROUP HOLDINGS LTD (JP)
TOSHIBA MACHINE ENGINEERING CO LTD (JP)

International Classes:

B29C45/00; B29C45/54; B29K105/04

Foreign References:

JPH10230528A	1998-09-02
JPS60220724A	1985-11-05
JPS50144066U	1975-11-28
JP2001269963A	2001-10-02
JPS4818365A
JP2008094495A	2008-04-24
JP4460074B2	2010-05-12

Other References: