Oriented polyethylene film and production thereof
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United States of America Patent
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Sep 3, 1991
Grant Date -
N/A
app pub date -
Sep 7, 1989
filing date -
Sep 8, 1988
priority date (Note) -
Expired
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Abstract
Disclosed are oriented polyethylene films having specific elongation and strength, which are excellent in linear tearability and clear tearability, suitably used for packaging and produced by longitudinally stretching a polyethylene resin sheet in which the degree of crosslinking inwardly decreases across the thickness thereof at a draw ratio of at least 5 times at a temperature of not higher than the melting point of a polyethylene resin forming the polyethylene resin sheet, and laterally stretching said sheet 4 to 8 times at a temperature ranging from above the melting point of the polyethylene resin up to 10.degree. C. higher than the melting point thereof.
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