Hot runner nozzle and mold for forming multilayer molded products using this hot runner nozzle

摘要

PROBLEM TO BE SOLVED: To prevent insufficient feed of a molten resin for the molding surface layer spread along a mold core-side product surface, in producing a layer-structured molding in which a middle layer consisting of a resin layer composed of a molten resin for the molding middle layer is arranged between two resin layers composed of a molten resin for the molding surface layer by molding using a hot runner nozzle, so as to obtain a molding in which the resin of the middle layer is arranged on the central side, or central side in the layer structure, in the cross section of the molding.SOLUTION: In a hole 5 for a shutoff pin of a hot runner nozzle 1, there is provided a large-diameter part 14 which is larger in diameter than the shutoff pin 4 and to which a middle-position resin discharge port 12 and the last-position resin discharge port 11 face, and the middle-position resin discharge port 12 communicates with the last-position resin discharge port 11 through the large-diameter part 14. In the large-diameter part 14, a molten resin b for the molding middle layer fed from the middle-position resin discharge port 12 is joined with a molten resin 'a' for the molding surface layer fed from the last-position resin discharge port 11, and the molten resins b and 'a' are fed to the side of the nozzle gate 6.