Injection molding method for manufacturing a thermoplastic part free from sink marks using a void inducing member
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United States of America Patent
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Aug 3, 1993
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N/A
app pub date -
Dec 10, 1991
filing date -
Jan 14, 1991
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Abstract
When injection-molding a molten thermoplastic resin into a molding having different thicknesses, a void inducing member is set in a cavity corresponding to heavy sections. Then gas pressure is applied passing through a gas passageway to a tip end of the void inducing member, thus forming a void nucleus in the resin adjacent to the tip end of the void inducing member. The void nucleus develops to a void by shrinking force of the resin as the molten resin cools.
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