Gas Assist Injection Molding

Gas Assist Injection Molded Parts provide an advantage when molding thicker parts. Gas assist injection molding parts will produce smooth outer finishes with no sink marks, become lighter in weight, improve dimensional stability, along with reducing cycle times, and material costs.

Thermo plastic parts produced by Gas Assist Injection Molding have solid outer edges and hollow middle sections. After the thermoplastic polymer is shot into the mold an inert gas such as nitrogen is injected into the melted polymer through injector pins or nozzles. The gas forces the melted polymer against the cold walls of the mold, forming a solid outer edge or “skin”. Gas flows through the thickest or hottest section of the part forming the hollow areas.