Method of forming container with high-crystallinity sidewall and low-crystallinity base
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United States of America Patent
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Nov 3, 1998
Issued Date -
N/A
app pub date -
May 24, 1996
filing date -
Jul 7, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of making a polyester container having an enhanced level of crystallinity in the sidewall while maintaining a low level of crystallinity in a thickened base portion. The container is particularly useful as a refillable container which can withstand higher caustic wash temperatures and exhibits reduced flavor carryover, or as a hot-fill container. According to the method, a sidewall-forming section of a preform is initially expanded, heated to contract and crystallize the same, and than reexpanded; a base-forming portion of the preform is shielded from the heat treatment and is expanded either before or after the heat treatment step.
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