PROCESS FOR PREPARING COMPOSITE FOAMED MOLDED ARTICLE

摘要

The process for preparing a composite foamed molded article according to the invention comprises the steps of setting a skin material in the vicinity of an upper mold for stamping-mold kept at a temperature of 10 to 50 feeding a molten polypropylene resin composition for a substrate containing a foaming agent kept at a temperature of not lower than a decomposition temperature of the foaming agent and within the range of 180 to 240 surface of a lower mold for stamping-mold kept at a temperature of 30 to 80 seconds after feeding of the composition to clamp the molds at a pressure of 20 to 70 kg/cm2; lifting the upper mold before a thickness of each of hardened layers formed on both surfaces of the composition layer reaches 1.0 mm to open the mold at a distance between the upper mold and lower mold of 1.1 to 2 times of a thickness of a flat portion having neither boss nor rib in the composition layer, thereby to foam the composition; and cooling the foamed substrate layer made of the polypropylene resin composition to harden the substrate layer. The composite foamed molded articles thus obtained is lightweight and has high rigidity.