Patent ID: 10906216

Abstract:
The present invention provides a method for manufacturing a molded foam product which can reduce or prevent blisters and crinkles on the surface even in the case of manufacturing a molded product designed to have a small thickness, thereby giving a molded foam product having excellent heat insulation while avoiding an increase in the amounts of materials used. The method for manufacturing a molded foam product according to the present invention includes the steps of: injecting, during injection molding, a molten resin containing a supercritical fluid or a chemical foaming agent into a cavity formed in a mold that includes a movable portion; and moving the movable portion to increase the volume of the cavity before the molten resin injected into the cavity completely solidifies, the mold alternately including, in a direction from a resin injection port to the periphery of the cavity, first linear portions each giving a large gap size in the cavity and second linear portions each giving a small gap size in the cavity.