Method and Apparatus of Gas-Assisted Injection Molding of Thick Parts
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United States of America Patent
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app pub date -
Jul 10, 2009
filing date -
May 1, 2008
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Abandoned
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Abstract
Gas-assisted injection molding is used to form molded parts having relatively thick cross-sections, such as a support section of a chair back and seat portion of a chair. Gas is injected into a mold cavity using the same nozzle and screw injector that injects molten resin into the mold cavity. The injected gas creates a void in the molten resin that allows a reduced amount of resin to be used to fill a mold cavity without sacrificing the integrity of the molded part.
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