INJECTION-MOLDED ARTICLE MANUFACTURING METHOD AND INJECTION MOLDING DIE

PROBLEM TO BE SOLVED: To provide an injection-molded article manufacturing method and an injection molding die with which no gate cut mark remains in an injection molding step.SOLUTION: Provided is an injection-molded article manufacturing method using a die which includes: a cavity 20 that forms a shape of a prescribed injection-molded article; a gate 27 for introducing a molding material into the cavity 20; and a pin guide 23 for projecting a shutoff pin 33 inside the cavity 20. The injection-molded article manufacturing method includes a step of molding the injection-molded article by introducing the molding material in a molten state into the cavity from an injection molding device via the gate 27 and then cooling and solidifying it. The injection-molded article includes a hole, and the pin guide 23 is provided at a position corresponding to the hole. The shutoff pin 33 is projected inside the cavity 20 and closes the gate 27 through the molding material.SELECTED DRAWING: Figure 5 【課題】射出成形工程において、ゲートカット跡が残らない射出成形品の製造方法及び射出成形用金型の提供。【解決手段】所望の射出成形品の形状を成すキャビティ２０と、キャビティ２０内に成形材料を導入するためのゲート２７と、キャビティ２０内にシャットオフピン３３を突き出すためのピンガイド２３とを備える金型を用いた射出成形品の製造方法であって、射出成形装置から前記ゲート２７を介して前記キャビティ内に成形材料を溶融状態で導入しこれを冷却固化することで前記射出成形品を成形する工程を備え、前記射出成形品は、孔を備え、ピンガイド２３は、前記孔に対応した位置に設けられ、シャットオフピン３３は、キャビティ２０内に突き出され前記成形材料を貫通して前記ゲート２７を塞ぐ、射出成形品の製造方法。【選択図】図５