Patent ID: 6290893
Filing Date: 2001-09-18
Classification: B29C

Abstract:
A method to improve certain characteristics of injection molded plastic products comprising injecting molten plastic resin through at least one gate into a mold cavity within a mold body, said mold body being equipped with at least one non-injection well and non-injection well gate in the mold body, said non-injection well gate of a cross-section substantially less than the cross-section of the non-injection well, said non-injection well in communication with the mold cavity only through the non-injection well gate and at least one reciprocateable packing pin penetrating the mold body into communication with the non-injection well, non-injection well gate and the mold cavity, and subjecting at least a portion of the molten plastic resin in the mold cavity and non-injection well to a to and fro movement by reciprocating the packing pin as the molten plastic resin solidifies.