Gas Counter Pressure Molding is a supplemental process to single-nozzle structural foam molding for enhanced part surface finish. Gas counter pressure requires the tool to be charged under pressure. When the material enters a pressurized cavity, it produces a part with improved surface finish by providing a more resin-rich surface. Gas Counter Pressure is somewhat limited to parts with flat parting lines. Complex geometries that require stepped parting lines do not easily permit the gasketing required to pressurize the mold.
