Patent ID: 6129536
Filing Date: 2000-10-10
Classification: B29C

Abstract:
A multi-cavity coinjection mold having a relatively large plurality of mold cavities for simultaneously molding a relatively large plurality of multi-layered articles comprising:a mold structure defining a plurality of cavity groups of mold cavities, each group defining a relatively small plurality of said mold cavities;a first supply source for supplying a first molding material;a second supply source for a supplying a second molding material;a first hot runner system in communication with said first and second supply sources for conveying said first and said second materials separately to a region proximate each cavity group;a valve mechanism per cavity group for receiving said first and said second materials from said first hot runner system, each valve mechanism being for sequentially supplying desired quantities of said first and said second materials contiguously to a single balanced hot runner for the associated cavity group, wherein each hot runner communicates with a single cavity group only; anda temperature control means for maintaining the desired respective temperatures of said first hot runner system, hot runners and said cavities.