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

摘要

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.