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HORIZON PLASTICS has perfected a new technology known as "Structural Web" - parts molded using this know-how do not have the typical swirl-pattern of Structural Foam. The part surfaces are smooth and uniform, similar to conventional injection moldings, without the sink marks.
Structural Web / Gas Assist Injection Molding
Structural Web Injection Molding is a low-pressure process utilizing nitrogen gas to apply uniform pressure throughout the molded plastic part, similar to gas assist molding. Structural Web / Gas assist molding produces parts with superior surface appearance to enhance the look and quality of the product molded.
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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. Structural Web Injection Molding allows molders the freedom to design plastic parts without the restrictions and 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 shot. Clamp tonnage requirements are dramatically reduced by 50% or more in most gas assist applications.
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