Method for forming hollow partially crystalline biaxially oriented heat set polyethylene terephthalate articles
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United States of America Patent
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-
Oct 3, 1989
Issued Date -
N/A
app pub date -
May 18, 1988
filing date -
Mar 2, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus of forming a hollow partially crystalline heat set biaxially oriented polyethylene terephthalate container having a hemispherical base comprising blowing a heated parison at orientation temperature outwardly against the confines of a mold which is at heat setting temperature wherein the side wall and the major portion of the base of the container are subjected to a heat setting temperature and the center of the base of the container is subjected to a temperature not greater than 150.degree. C. so that the central portion is crystallized a substantially lesser amount than the side wall and the major portion of the base. The container is then quenched. The resultant container can be formed at a rapid cycle and has good drop impact properties and obviates the problems of sticking to the hot mold or blow out when the hot mold is opened.
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