Patent ID: 6887406

Claim:
A process for producing an injection molded article having a hollow rim portion, comprising the steps of: providing a mold having a mold cavity and a mold core, wherein a gas channel depression is formed along at least one surface of the mold core and the mold cavity and extending between a gate of said mold and a rim portion of said mold; injecting a short shot of injection molding material into said mold via an injection nozzle; permitting said mold cavity to fill in an unbalanced manner as a result of said gas channel; closing said injection nozzle; and injecting a pressurized gas into said short shot of injection molding material, wherein said pressurized gas travels through said gas channel into said rim portion of said mold thereby expanding said injection molding material throughout said mold and simultaneously creating a hollow cavity within said rim portion of said mold.