Patent ID: 7407380
Filing Date: 2008-08-05
Classification: B29C

Abstract:
1. An injection molding apparatus comprising: a manifold for receiving a melt stream from a source; a nozzle having a nozzle channel for receiving the melt stream from said manifold; a mold cavity in communication with said nozzle channel for receiving melt through a mold gate; a valve pin extending through said nozzle channel for selectively opening said mold gate; a valve pin bushing provided between said manifold and said nozzle, said valve pin bushing having a bore for slidably receiving said valve pin; a chamber provided in said valve pin bushing, said chamber being in communication with said valve pin bore; an inlet channel provided in said valve pin bushing, said inlet channel extending between an inlet located in an outer surface of said valve pin bushing and said chamber; and a vent channel provided in said valve pin bushing, said vent channel extending between said chamber and an outlet located in said outer surface of said valve pin bushing.