Patent ID: 6630090
Filing Date: 2003-10-07
Classification: B29C

Abstract:
An injection molding process comprising:providing a multi-injection unit injection molding machine and performing different molding operations including performing a first single layer molding operation including injecting a first resin from a first injection unit into a mold cavity to form a single layer part, removing the single layer part; performing a second multi-layer molding operation includingadding a second resin to the first resin to form a mixed resin mixture in said first injection unit, then forming the skin layer of a multi-layer part by injecting at least one additional resin from at least a second injection unit into the mold cavity to form a skin layer of the multi-layer part, then injecting the mixed resin mixture from the first injection unit into the mold cavity to form the core layer of the multi-layer part,wherein the mixed resin mixture is not visible on the skin layer of the multi-layer part and removing the multi-layer part.