INJECTION MOLDING APPARATUS FOR FORMING PLASTIC ARTICLES

摘要

An injection molding device of a plastic product is provided to prevent the generation of the burr by pressing a pressure projection of a stay-put core in a groove of a moving core. An injection molding device of a plastic product comprises: a penetration hole molding unit; a stay-put core(12) and a moving core(22) in the top and lower die; a pressure projection(16) protruded to the stay-put core; and a forcing groove(26) extruded in the base of the moving core in order to contact with the pressure projection. The hardness of the moving core is lower than the stay-put core.