| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a plastic board comprising a foam layer having a foam structure and a surface layer, wherein the surface of the board hardly wrinkles and is provided with excellent surface properties. SOLUTION: The method for producing the plastic board with a multiple-layer structure comprising the foam layer having the foam structure and a non-foam surface layer formed at least on one face side of the foam layer by employing an extrusion mold comprises the steps of forcedly cooling both ends in the width direction of an extrusion-molded body molded by extruding the foam layer and the surface layer integrated with each other and then applying pressure on the extrusion-molded body in the thickness direction to produce the plastic board. Preferably, a method of blowing gas is employed for the forced cooling, and waste plastics are used as a starting resin material. COPYRIGHT: (C)2005,JPO&NCIPI |
