Method and apparatus for compensating for in mold material shrinkage
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United States of America Patent
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Issued Date -
Apr 6, 2006
app pub date -
Oct 4, 2004
filing date -
Oct 4, 2004
priority date (Note) -
Abandoned
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Abstract
A method of compression molding preforms for blow molding containers includes the steps of providing a preform mold that includes a mold cavity and a mold core, placing a mold charge of plastic resin into the mold cavity, advancing the mold core into the mold cavity to cause the mold charge resin to flow and fill a preform mold volume between the core and cavity, and then as the plastic resin cools and shrinks, advancing the mold core further into the mold cavity. Accordingly, in this method of compression molding plastic articles, the mold core is advanced into the mold cavity as the mold charge material cools and shrinks, to reduce the volume of the preform mold.
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