Gas Assist Technology

What is Gas Assist?

Gas Assist Injection Molding is a low-pressure process utilizing nitrogen gas to apply uniform pressure throughout the molded plastic part.

By displacing molten plastic from thicker sections of the part toward areas in the cavity that are last to fill, nitrogen gas pressure creates channels within the part.

Through the gas channels, pressure is transmitted evenly across the part, eliminating warpage, sink marks and internal stress. As a result, reductions in clamp tonnage, cycle time, and part weight are realized while the strength and rigidity of the part is increased. Gas Assist Injection Molding allows molders the freedom to design plastic parts without the restrictions limitations inherent to conventional molding.

Thin wall parts with heavy ribs, bosses and gussets are formed to high standards of flatness without sink marks or long cycle times. Long shapes are produced without multiple drops or hot runner systems, eliminating knit lines and lowering tooling costs. Multiple parts with complex design and differing wall thickness are molded as a single part without defect. Clamp tonnage requirements are dramatically reduced by 50% or more in most gas assist applications.

Paramount uses an internal system to generate pressures of up to 5,000psi with purity levels in excess of 99.5%. This level of purity enables us to provide the highest level of part consistency, and reduces mold wear. Many of our competitors cannot make this promise.

Heavy ribs and bosses can be incorporated in your design without fear of sinks on the part surface. The ribs may actually be thicker than the nominal wall.

Heavy wall parts can be cored out to reduce part weight and improve cycle time