Patent ID: 6220850
Filing Date: 2001-04-24
Classification: B29C,B29K

Abstract:
An injection molding machine having a plurality of mold cavities for forming a plurality of plastic articles during an injection cycle, comprising:a source of molten plastic resin;a plurality of nozzle assemblies, each said nozzle assembly having a channel for conveying said molten resin to a heated nozzle tip,a mold gate insert adjacent each said nozzle assembly, said mold gate insert permitting communication between said nozzle assembly and its respective mold cavity, said mold gate insert having a first portion formed of a wear resistant material having a relatively low thermal conductivity to provide thermal insulation of said nozzle tip, and a second portion forming a section of said mold cavity extending beyond said mold gate, said second portion formed of a material having a second thermal conductivity for rapidly cooling said section during a cooling phase of said injection cycle.