Method of and apparatus for maintaining uniform hot melt coatings on thermally sensitive webs by maintaining dimensional stability of silicone and rubber-like web back-up rolls
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United States of America Patent
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-
Feb 21, 1989
Grant Date -
N/A
app pub date -
May 22, 1987
filing date -
May 22, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Uniformity of hot melt coatings on thermally sensitive plastic and other webs is maintained by use of a silicone or other rubber-like web back-up roll the dimensional stability of which is maintained during hot melt coating of the webs by a heat-conducting idler roll directly contacting the back-up roll temperature and a heat transfer source for temperature deficiencies on the silicone roll surface, aiding constant nozzle-to-web spacing irrespective of temperature variations and line speeds. Provision is also made for the introduction of chilling, if required.
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