RESIN INJECTION MOLDING DIE AND METHOD FOR PRODUCING RESIN MOLDED PRODUCT

摘要

A molding die is devised to suppress the formation of a fragile layer, thereby ensuring stable production of a resin molded body having remarkably improved adhesion of a plating film. A plurality of stepped parts are formed so as to be spaced apart from each other on a second die surface which molds a back surface on the side opposite to a design surface to which metal plating is to be applied, along the main flowing direction of a molten resin and in a direction crossing the main flowing direction. Since the flow of the molten resin changes due to the stepped parts and the influence thereof extends even to the vicinity of the design surface, the formation of a fragile layer is suppressed.

主权项

1. A resin injection molding die comprising a first die surface which molds a design surface of a resin molded body to which metal plating is to be applied and a second die surface which molds a back surface on the side opposite to the design surface and faces the first die surface,
wherein the second die surface is provided with a plurality of stepped parts which are formed so as to extend one step higher or lower than a common die surface part, with a step surface, and then to continue to the common die surface part, along the main flowing direction of a molten resin which, during injection molding, flows in a cavity formed by the first and second die surfaces, and wherein the step surfaces cross the main flowing direction of the molten resin, and the plurality of stepped parts are formed so as to be spaced apart from each other also in a direction crossing the main flowing direction of the molten resin.