METHOD OF INTEGRAL MOLDING OF THERMOPLASTIC MATERIAL AND AUTOMOBILE DOOR PANEL FORMED BY THE METHOD

WIPO Patent Application WO/2003/084729

A1

A method of integral molding of thermoplastic material, comprising a step of primary thermoplastic material injection wherein, among two types of thermoplastic materials with different molding shrinkage factors, a thermoplastic material of higher molding shrinkage factor as a primary thermoplastic material is injected in cavity (2) and a step of secondary thermoplastic material injection wherein a thermoplastic material of lower molding shrinkage factor as a secondary thermoplastic material is injected in the cavity (2), wherein in the step of secondary thermoplastic material injection, the secondary thermoplastic material is injected in the cavity (2) when, upon advance of the shrink of the primary thermoplastic material, the shrinkage factor attributed to the rest of shrinkage of the primary thermoplastic material has become equal to the molding shrinkage factor of the secondary thermoplastic material.

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HASEGAWA TOMOMI
AE HARUHIKO
SHIBATA YASUMASA
FURUKAWA YASUSHI

PCT/JP2003/004320

October 16, 2003

April 04, 2003

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IDEMITSU PETROCHEMICAL CO (JP)
NGK INSULATORS LTD (JP)

B60R13/02; B29C45/16; B29C45/26; B29C45/56; B60B31/02; B29K23/00; B29K105/04; B29K105/16; B29L31/30; (IPC1-7): B29C45/16; B29C45/22; B60J5/00

JPS59155022A	1984-09-04
JP2002060560A	2002-02-26
JPH0210919U	1990-01-24
JPH10250519A	1998-09-22
JP2000210978A	2000-08-02

Kinoshita, Jitsuzo (Ogikubo TM building 26-13, Ogikubo 5-chom, Suginami-ku Tokyo, JP)

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