Process for heat treating thermoplastic containers
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United States of America Patent
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Dec 30, 1997
Grant Date -
N/A
app pub date -
Jan 31, 1995
filing date -
Jan 31, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for preparing a thermoplastic container including the steps of providing a biaxially oriented, crystallized precontainer having a first contained volume, and further crystallizing the precontainer by applying heat thereto while the precontainer is substantially unconstrained, and forming a deformed precontainer having a second contained volume. Deformation of the precontainer is controlled by controllably closing the precontainer prior to further crystallizing and while the precontainer remains substantially unconstrained to create a predetermined increased air pressure therein, and reshaping the deformed precontainer into a final container shape.
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