MOLD ASSEMBLY FOR MOLDING THERMOPLASTIC RESIN AND PRODUCTION OF HOLDING

摘要

PROBLEM TO BE SOLVED: To provide a mold assembly for molding a thermoplastic resin which can extend a gate part sealing time and a pressure holding period and improve the transfer properties of a surface constituting the cavity of a mold to a molding. SOLUTION: A mold assembly is equipped with a first mold part 11 and a second mold part 12 for forming a molding from a thermoplastic resin, a cavity insert 20 of 0.1-10 mm thickness which is installed in the first mold 11 and constitutes part of a cavity 13, and a gate part 14 which is opened to the cavity. The cavity insert 20 is made of a material of 2×10-2 cal/ cm.sec. deg.C or below in heat conductivity, and the gate part 14 is at least made of a material of 2×10-2 cal/cm.sec. deg.C or below in heat conductivity.