Patent ID: 6074583
Filing Date: 2000-06-13
Classification: B29C,B29L,B30B,Y10S

Abstract:
A method for compression molding a plastic article comprisingproviding a first upper tooling assembly having a male mold associated therewith,providing a second lower tool assembly having a cavity mold associated therewith, said cavity mold having a peripheral portion and an inner central portion having limited relative movement with respect to one another, said male mold and cavity mold having a configuration forming a closure which has a complex configuration,providing a first fixed cam associated with the first tool assembly and a second fixed cam associated with the second tool assembly for moving said tool assemblies toward and away from one another,providing a fluid cylinder comprising a fluid filled chamber and a piston associated with said second assembly, said inner central portion of said cavity mold being associated with said piston of said fluid cylinder such that there is limited permissible movement between said fluid cylinder and said associated tooling,connecting said fluid cylinder to a manifold to apply said fluid in said cylinder continuously at a predetermined pressure during full motion at said tool assemblies,providing a charge of extrudate to the cavity of the cavity mold, andmoving the first and second assemblies relative to one another by said cams to move the first assembly and second assembly toward one another to close the mold and compress the charge to form an article.