Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Positioning of a mold part to form a cavity or controlling...
Patent
1992-10-08
1995-05-02
Timm, Catherine
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Positioning of a mold part to form a cavity or controlling...
264572, 425130, 425149, B29C 4500, B29C 4503, B29C 4576
Patent
active
054116856
ABSTRACT:
A gas control unit for a gas-assisted injection molding system, wherein a quantity of gas is introduced into a mold cavity in combination with a quantity of plastic material during the molding process. The gas control unit operates on the basis of regulating the mass of gas within the system, as opposed to the final hold pressure. Because the mass of the gas is constant within the gas control unit throughout an injection cycle, a preferred initial-to-final (hold) pressure ratio can be determined through mathematical computations for a particular molding system. As a result, once the required mass of gas has been isolated from a suitable source, releasing the gas to the mold cavity results in a predictable pressure. This capability permits the gas control unit to determine whether the gas has fully expanded and, therefore, whether the gas has properly filled the mold cavity so as to produce a properly molded article.
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Design-Rite, Inc.
Timm Catherine
VanOphem Remy J.
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