INJECTION MOLDING METHOD FOR THERMOPLASTIC RESIN

摘要

PROBLEM TO BE SOLVED: To manufacture a void-free molded product without lowering productivity by molding in the relation between the average weight of grains of thermoplastic resin and the containing ratio of linked grains being within the range of satisfying a given formula. SOLUTION: Molding is carried out in the range of satisfying a formula I of O<=W×T<=8.0 in the relationship of containing ratio T (weight %) between the average weight W (mg/grain) of grains of a linked body having the weight of approximately 1.5-2.5 times the average weight of normal unlinked grains of thermoplastic resin. Preferably molding is carried out within the range of satisfying a formula II of O<=W×T<=6.0. when the product of the average weight W (mg/grain) per grain of thermoplastic resin and the containing ratio T (weight %) of the linking grains is beyond the range of formula I, the generation of voids in a molding product becomes great.