HOLLOW MOLDED PRODUCT AND PRODUCTION THEREOF

摘要

PURPOSE: To obtain a hollow molded product reduced in surface appearance inferiority such as surface roughening or glass irregularity and excellent in mold transfer properties by performing gas assist injection molding under specific molding conditions. CONSTITUTION: A polyacetal resin melted under heating is injected and introduced into a cavity. Next, gas such as nitrogen gas is injected into the molten resin in the cavity from the nozzle of a molding machine or the needle arranged to a part of a mold to obtain a hollow molded product. Gas assist injection molding is performed so as to satisfy formula 210( deg.C)