Method of suppressing paper web flutter
First Claim
1. A method of handling a high speed continuously running paper web, comprising:
- running the web in a generally horizontal free draw span between substantially spaced web handling means;
in said draw span running the web along and in adjacently spaced facing relation to foil means comprising a plate elongated in the direction of web travel and extending throughout a major portion of the span between said handling means and having a face in a plane extending across and longitudinally along and in adjacently spaced substantially parallel relation to one face of the web;
leaving the remaining face of the web facing an open space in said draw span;
and simply by the unaided running of the web in said relation to said plate face reducing and stabilizing the boundary layer of air between said high speed running web and said plate face and thereby suppressing tendency of the web to flutter.
1 Assignment
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Accused Products
Abstract
Web flutter is suppressed by means of one or more foils along the path of movement of the web which may be porous, such as tissue, whether creped or not, or may be substantially non-porous. For porous web, the foil may be imperforate. For non-porous web, the foil may be foraminous. As the web travels at high speed in adjacently spaced relation to the foil, surface air pressure tends to be greater on the surface of the web opposite the web surface which faces the foil, thus tending to thrust the travelling web toward the foil, and thus stabilizing web travel and suppressing tendency for the web to flutter as it travels freely between supports such as a dryer and a calender.
38 Citations
7 Claims
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1. A method of handling a high speed continuously running paper web, comprising:
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running the web in a generally horizontal free draw span between substantially spaced web handling means; in said draw span running the web along and in adjacently spaced facing relation to foil means comprising a plate elongated in the direction of web travel and extending throughout a major portion of the span between said handling means and having a face in a plane extending across and longitudinally along and in adjacently spaced substantially parallel relation to one face of the web; leaving the remaining face of the web facing an open space in said draw span; and simply by the unaided running of the web in said relation to said plate face reducing and stabilizing the boundary layer of air between said high speed running web and said plate face and thereby suppressing tendency of the web to flutter. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification