METHOD FOR PRODUCING THERMOPLASTIC RESIN FOAM BODY

摘要

Provided is a production method with which when a thermoplastic resin is extruded from a single long, thin outlet opening disposed in a mold in order to extrusion- mold a tabular thermoplastic resin foam body, a smooth foam body can be obtained with little undulation in the direction of width of the foam body. The method for producing a thermoplastic resin foam body is characterized in that when horizontal width of the outlet opening in the mold is L1, horizontal width of the cross section of the resin flow path at the inlet opening is L2, and the distance between the inlet opening and the outlet opening is D, L1/L2 is 1.3 or greater and 3 < L1/D < 20 and the longitudinal width in the center in the direction of horizontal width of the cross section of the resin flow path at the inlet opening is narrower than the longitudinal width at either end in the direction of horizontal width.