Patent ID: 8128397

Claim:
A crossover nozzle system for transferring molten plastic from a feeder manifold to a main manifold of the molding chambers of the stack molds of an injection molding machine, the system comprising: a primary system side comprising: a primary sprue bar having an inlet hole that is in fluid communication with a feeder manifold; a floating sprue insert within a cavity of the primary sprue bar, the floating sprue insert having a plurality of radial holes in fluid communication with the inlet hole; and a primary sprue insert connected to the primary sprue bar, the primary sprue insert having a primary sprue insert hole that is in fluid communication with the plurality of radial holes, the primary sprue insert having a primary opening that is in fluid communication with the primary insert hole, the primary sprue insert having a primary cooling channel adjacent to the primary opening; and a secondary system side in contact with the primary system side, the secondary side comprising a moveable secondary sprue, wherein the primary sprue insert is configured to contact the moveable secondary sprue, the secondary sprue having a secondary opening that is in fluid communication with a secondary sprue hole, the secondary sprue hole being in fluid communication with the main manifold, the secondary sprue having a secondary cooling channel adjacent to the secondary opening, wherein the primary and secondary insert holes contact to form a chamber and the primary and secondary openings meet at a parting line, wherein the primary and secondary cooling channels are configured to cool the primary and secondary sprues, respectively, about the parting line to cool molten plastic passing through a portion of the chamber and create a viscous seal from the molten plastic.