Method of treating hollow articles, in particular polyethylene terephthalate preforms
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United States of America Patent
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Aug 16, 1988
Grant Date -
N/A
app pub date -
Nov 12, 1986
filing date -
Nov 19, 1985
priority date (Note) -
Expired
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Abstract
A method of treating PET preforms and bottles consists of subjecting the preforms or the bottles to a carbon dioxide atmosphere at a higher temperature than the critical temperature of carbon dioxide, a higher pressure than ambient pressure, and for a set time period. The treatment reduces the acetaldehyde concentration in the head of the treated bottles or in the bottles obtained from the treated preforms by stretch-blowing, and also reduces the permeability of gases through the bottle walls.
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