Injection molding method

专利名称：Injection molding method发明人：Masaaki Minamimura,Fumio

Shiozawa,Masahiko Miyajima

申请号：US08/287836申请日：19940809公开号：US05451363A公开日：19950919

摘要：An improved injection molding method comprising, tightening an injectionmolding die with a die tightening force lower than that corresponding to a conventionallyrated pressure, injecting a molten resin in a die cavity with an injection molding pressureof which intensity is determined corresponding to the die tightening force so that a gap isformed so as to permit only gas to flow outside of the die cavity via the gap, aftercompletion of injecting temporarily interrupting injection molding so as to release a partof the injection molding pressure from the die cavity so as to maintain the reducedinjection molding pressure in the die cavity in the uniformalized state, and raising the dietightening force up to a level corresponding to the rated pressure, and moreover, raisingthe injection molding pressure in the die cavity. Since a molten resin is injected in the diecavity with a low intensity of injection molding pressure with a low corresponding dietightening force, and moreover, the injection molding pressure is held in the die cavity inthe uniformalized state before it is retained in the die cavity, a molded article having asmall thickness and a large projected area can easily be produced without any occurrenceof a malfunction such as warpage or the like.

申请人：NISSEI PLASTIC INDUSTRIAL CO., LTD.

代理机构：Ostrolenk, Faber, Gerb & Soffen

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