Gas Assisted Plastic Injection Moulding

For over 25 years, Weiss Precision has used gas assist molding for plastic injection molding in a variety of applications, offering OEMs numerous advantages. When it comes to reducing time and cost without compromising quality or design options, gas assist injection molded plastics make a great choice.

Gas Assist Molding Process
Pressurized nitrogen gas is injected into a mold, pushing the plastic into the mold extremities, while hollowing out thicker portions of the part. Gas assist molding is a process of plastic injection molding at low pressure, in which plastic is pushed into mold extremities by pressurized nitrogen gas.

During the gas assist molding process, plastic material is melted and injected into mold cavities via conventional injection molding. Plastic material in contact with the mold walls begins to solidify first. As this happens, nitrogen gas is injected into the mold through strategically designed and placed gas channels, providing pressure that pushes the plastic material into the mold extremities. Once the plastic cures, the nitrogen is vented and the gas assist injection molded plastic parts are removed from the mold.