METHOD FOR PRODUCING MOLDED FOAM BODY

摘要

In a method for producing a foamed molded product, an operation of measuring molten resin by a screw is stabilized. The method for producing a foamed molded product includes:
using a molding apparatus including a plasticizing cylinder having a high pressure kneading zone in which a molten resin, obtained by plasticizing a thermoplastic resin, is brought in contact and kneaded with a physical foaming agent, and a pressure reduction zone in which a gasified physical foaming agent is discharged from the molten resin brought in contact and kneaded with the physical foaming agent; and a screw which is arranged rotatably and movably back and forth in the plasticizing cylinder;
controlling a pressure of the pressure reduction zone to be a first pressure in a state that communication between the high pressure kneading zone and the pressure reduction zone is shut off, the first pressure being not less than an atmospheric pressure and not more than a maximum pressure of the high pressure kneading zone which is reached in a case that the molten resin is brought in contact and kneaded with the physical foaming agent;
controlling back pressure of the screw to be a second pressure which is not less than the first pressure; and
measuring a predetermined amount of the molten resin from which the gasified physical foaming agent has been separated.