| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing an injected and foam-molded product while reducing the formation of silver streaks and tiger stripes on the surface of the injected and foam-molded product while keeping the excellent properties and good moldability possessed by a polypropylene resin. SOLUTION: The method for producing the foam-molded product, by a core-back method using a mold for injection molding comprising a movable mold and a fixed mold, involves using a resin composition comprising 70-93 wt.% propylene-based polymer consisting of 85-97 wt.% propylene-ethylene block copolymer and 3-15 wt.% propylene homopolymer, and 7-30 wt.% linear low-density polyethylene as a raw material, starting the packing of the resin under a condition under which the clearance between the movable mold and the fixed mold is small, finishing the packing in a short time while enlarging the clearance, and carrying out the foam molding by enlarging the clearance more. COPYRIGHT: (C)2004,JPO |
