Heat-shrinkable envelope having low-tearing susceptibility
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United States of America Patent
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Oct 5, 1993
Grant Date -
N/A
app pub date -
Oct 13, 1989
filing date -
Oct 18, 1988
priority date (Note) -
Expired
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Abstract
A heat-shrinkable envelope of crosslinked polymeric plastic material is composed of regions having different amounts of shrinkability which regions are disposed uniformly over the entire area of the envelope. The difference in the regions of shrinkability can be obtained by different amounts of crosslinking, by different geometric shapes for the two regions or a combination of both. The regions can be arranged in sandwich-like layers or can be arranged in alternately-arranged, parallel-extending bands. The regions having the lower shrinkability resist tearing and continued tearing of the regions with the high shrinkability and the region with the high shrinkability insure a proper shrinking of the envelope onto the article or material being surrounded thereby.
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