Process for preparing composite foamed molded article

A process for preparing a composite foamed molded article comprising the steps of:

• feeding a molten propylene 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.degree. C. onto a surface of a lower mold kept at a temperature of 30 to 80.degree. C;
• setting a skin material between a surface of an upper mold kept at a temperature of 10 to 50.degree. C. and the surface of the lower mold containing the molten polypropylene resin composition, immediately after or simultaneously with feeding of the polypropylene resin composition;
• closing the upper and lower mold within 10 seconds after feeding of the polypropylene resin composition to clamp the molds at a pressure of 20 to 70 kg/cm.sup.2, thereby to laminate a substrate layer formed from the polyproplene resin composition and the skin material simultaneously with shaping of the substrate;
• lifting the upper mold before a thickness of each of hardened layers formed on both surfaces of the polypropylene resin composition layer reaches 1.0 mm to open the upper mold and the lower mold to a distance between these molds of 1.1 to 2 times a thickness of a flat portion having neither boss nor rib in the polypropylene resin composition layer, thereby to foam the polypropylene resin composition;
• and