| 摘要 |
PROBLEM TO BE SOLVED: To provide an injection foam molding machine and a method for injection foam molding which suppress intrusion of foaming gas and air between a molded article and a mold, thereby prevent a swirl mark (trace of foaming gas) or a silver (silver streak) and make a movable die plate move parallel in momentary opening (core back) of the mold so as to make uniform the plate thickness of a foam molded article, on the occasion of foam molding by the injection foam molding machine. SOLUTION: When a molten resin filled by injection in a mold cavity is to be foamed by opening the mold momentarily, the speed of the momentary opening is controlled so that an in-mold pressure detected by an in-mold pressure sensor may not become minus. A plurality of ball screw type jacks are used for the momentary opening of the mold on the occasion of foaming and servomotors for driving the jacks are subjected to a tuning control. COPYRIGHT: (C)2004,JPO |
