Method for monitoring quality of paper web
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United States of America Patent
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Issued Date -
Jun 6, 2002
app pub date -
Jul 27, 2001
filing date -
Jan 28, 1999
priority date (Note) -
Abandoned
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Abstract
A paper web exiting a paper manufacturing machine is monitored on a continual basis, either substantially continuously or at periodic intervals, by imaging the web with a thermal camera operating in the infrared spectrum in order to detect defects such as wet spots, patches, or streaks in the base paper web and/or irregularities in a coating layer applied to the paper web in a downstream coating unit. Based on the detected defects, the manufacturing process and/or subsequent treatment process can be adjusted to eliminate the defects.
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