Method for producing polypropylene resin article having skin material lined with foamed layer

A method for producing a multi-layer molded article comprising a polypropylene resin body and a skin material lined with a foamed layer, which method comprises the steps of:

• providing a pair of upper and lower molds (1,2) which are slidably moved at an engaged part (6) and in which a cavity clearance (t) is freely set,
• placing a skin material (7) lined with a foamed layer between said upper and lower molds and supplying a molten polypropylene resin containing a chemical blowing agent through a resin melt conduit which is provided in said lower mold (2) or said upper mold (1) when said cavity clearance (t) is between (C+15) mm and (C+50) mm where "C" is a thickness of said skin material lined with the foamed layer,
• lowering said upper mold (1) at a rate of from 10 mm/sec. to 100 mm/sec. and pressing said resin melt at pressure of from 5 kg/cm.sup.2 to 100 kg/cm.sup.2 to fill cavity ends with said resin melt,
• pressing said body for 1 to 30 seconds after completing molding to form a skin layer,
• then, lifting up said upper mold (1) to decrease a compression pressure of said material lined with the foamed layer to a pressure lower than a blowing pressure of said blowing agent contained in said polypropylene resin to form and solidify a foamed body, and
• again lowering said upper mold (1) to apply a pressure of from 1 kg/cm.sup.2 to 20 kg/cm.sup.2 on a molded article and cooling said article in said molds.