METHOD OF PRODUCING POLYPROPYLENE FOAM SHEET FOR INTERIOR PARTS OF AUTOMOBILE USING LIQUID CO2

摘要

PURPOSE: A method of producing a polypropylene foam sheet for interior parts of a vehicle using liquid carbon dioxide is provided to reduce an installation space of a dies unit by miniaturizing an annular outlet port. CONSTITUTION: Polypropylene is melted(S10). Liquid carbon dioxide is supplied and mixed to and with the molten polypropylene as a foaming agent(S20). A foaming polypropylene extruded body extrudes and molds the polypropylene mixed with the carbon dioxide into a pipe shape(S30). A foam sheet is made by cutting and inflating the pipe-shaped foaming polypropylene in a longitudinal direction(S40).