METHOD OF COMPRESSION MOLDING A PLASTIC CLOSURE FROM FOAMED POLYMERIC MATERIAL
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United States of America Patent
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Issued Date -
Apr 21, 2011
app pub date -
Aug 27, 2010
filing date -
Aug 28, 2009
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Abstract
A method of compression molding a plastic article, such as a closure, includes providing a molten polymeric material, comprising a mixture of at least one molten polymer and a gas blended therein. The polymeric material is molded between cooperating male and female molds, with relative movement of the molds controlled to form a mold cavity with a predetermined volume. Formation in this manner acts to produce a molded closure with substantially reduced density, thus achieving desired material savings, while still providing a closure or like article exhibiting desired performance characteristics.
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