Patent ID: 7666335
Filing Date: 2010-02-23
Classification: B29C

Abstract:
1. A method of repositioning of a non-homogeneous melt condition which occur in a direction across the flow path of laminates of a stream of laminar flowing material in a runner of a mold to control at least one of the direction and magnitude of warpage in plastic molded parts, comprising: determining an undesirable warpage condition in a plastic part to be formed in a mold having a defined runner system that delivers a stream of laminar flowing, non-homogeneous material to at least one mold cavity; controlling the non-homogeneous melt conditions within the runner by strategically positioning a melt rotation device in the runner to control direction and magnitude of warpage in resultant plastic parts molded in the at least one mold cavity; and adjustment of at least one molding process variable to assist in control of the warpage direction and/or magnitude.