Patent ID: 6811393
Filing Date: 2004-11-02
Classification: B29C

Abstract:
A valved cross over nozzle comprising:a nozzle housing with a melt passage extending therethrough, a valve axis extending along said passage and a tapered valve seat in said passage extending about said valve axis; said nozzle housing having a first housing part and a second housing part separable along said valve axis through said valve seat at a housing interface, with a first valve seat part being carried by said first housing part and a second valve seat part being carried by said second housing part; a valve member having a tapered valve head disposed in said passage and axially movable relative to said nozzle housing between a closed configuration wherein said valve head engages said valve seat to block melt flow along said passage and an open configuration wherein said valve head is displaced from said valve seat to allow melt flow along said passage about said valve head; said valve head having a first valve head part and a second valve head part which meet at a valve interface corresponding to said nozzle interface and at which said valve member is separable along said axis into first and second valve parts for respectively sealing said first and second nozzle parts in said closed configuration; a valve opening actuator acting between said valve member and said nozzle housing for causing simultaneous movement of said first and second valve head parts relative to said nozzle housing toward said open configuration when said first and second nozzle housing parts and first and second valve parts are joined; a first valve closing actuator acting between said first valve head part and said first housing part to bias said first valve head part toward its closed configuration; and, a second valve closing actuator acting between said second valve head part and said second housing part to bias at least said second valve head part toward its closed configuration.