(1) ejection speed is designated as above 300mm/sec in the formation method of obtaining the formation item where

摘要

PROBLEM TO BE SOLVED: To provide a molding method of a transparent thermoplastic resin for obtaining a product having good optical characteristics or a large-sized glazing product of a construction machine, a car, a bus or the like and to provide this large-sized glazing product. ;SOLUTION: A molded article reduced in optical strain is obtained by the injection compression molding of a transparent thermoplastic resin. In this case, an injection speed is set to 300 mm/sec or more and, when the glass transition temp. of the thermoplastic resin is set to Tg, a main mold is held to temp. lower than Tg and the highest temp. of a cavity surface and a core surface at a time when the thermoplastic resin is in contact with the cavity surface of a mold and the core surface is set to [Tg+1]-[Tg+50]°C.;COPYRIGHT: (C)2001,JPO