METHOD FOR PRODUCING THERMOPLASTIC RESIN FOAM

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a thermoplastic resin form which enables the foam having a thin non-foaming layer and expanded in a high multiplying factor to be produced even when a resin composition comprises a filler. SOLUTION: The method for producing the thermoplastic resin foam features that a thermoplastic resin composition C impregnated with gas under a high pressure and comprising a thermoplastic resin A and a filler is fed from an extruder 1 into a die assembly 5 and then a thermoplastic resin B is fed from an extruder 4 into the die assembly 5 in such a way as to extrude the composition C and the resin B from the tip of the die assembly to release pressure under a condition where the resin B covers at least a part of the surface of the resin composition C along the die cavity surface in the die assembly 5.