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
war page, sink marks and internal stress. As a result, clamp tonnage, cycle time
and part weight is significantly reduced, while increasing the strength and
rigidity of the part. 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.
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