Patent ID: 9381689
Filing Date: 2016-07-05
CPC Classification: B29C,B29L

Claim Text:
1. A hot runner nozzle to be attached to a mold for forming a molded article having a layered structure, the hot runner nozzle comprising: a nozzle gate; a shut pin hole; a shut pin moving back and forth through the shut pin hole; and a plurality of resin discharge ports arranged in a length direction of the shut pin hole so that the plurality of resin discharge ports face the shut pin hole, molten resins from the resin discharge ports being joined in the shut pin hole, and the resin discharge ports being able to be opened and closed by the shut pin, wherein the nozzle gate has a diameter smaller than a diameter of the shut pin hole, the shut pin having a tip which includes a frustoconical end and a projection provided on the frustoconical end spaced from the edge of the frustoconical end so as to push out the molten resin in the nozzle gate toward a mold cavity in the mold when the shut pin moves forward to close all of the resin discharge ports, the shut pin further include a discharge port opening and closing mechanism part for opening and closing the resin discharge ports and a nozzle gate opening and closing mechanism part configured of the projection for pushing out the molten resin in the nozzle gate, and the discharge port opening and closing mechanism part and the nozzle gate opening and closing mechanism part have respective different diameters.