Method to control or regulate the basis weight of a paper or cardboard web
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United States of America Patent
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Jul 1, 2003
Grant Date -
Aug 29, 2002
app pub date -
Feb 22, 2002
filing date -
Aug 20, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Method for regulating a basis weight of a paper or cardboard web in the manufacturing process. The method includes determining a basis weight at an end of the manufacturing process, calculating a deviation of the determined basis weight from a predetermined target value, adjusting a concentration of a material suspension supplied to a headbox via a first control loop such that the calculated deviation is corrected, one of directly and indirectly measuring a basis weight of a resulting web in a region upstream, with regard to a web travel direction, a drying section, and supplying a signal related to the measured basis weight to a second control loop.
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