Patent ID: 9636852
Date: 2017-05-02
CPC Classifications: B29C,B29K,B29L

Claim:
1. An injection molding method for molding a sandwich molded product including a surface layer and an inner layer using a first mold and a second mold which are capable of forming a mold cavity, the method comprising: a mold clamping step of clamping the first mold and the second mold to form the mold cavity; a first injection filling step of injecting a non-foamable molten resin to the mold cavity to fill an interior of the mold cavity with the non-foamable molten resin, after completion of the mold clamping step; a mold cavity expansion step of slightly opening at least one of the first mold and the second mold with respect to the other thereof by a specified quantity to expand the mold cavity, after the completion of the first injection filling step; and a second injection filling step of injecting and filling a molten resin into the non-foamable molten resin within the mold cavity, after the start of the mold cavity expansion step.