Method to control or regulate the basis weight of a paper or cardboard web
AssigneeVoith Sulzer Papiermaschinen GmbH
InventorsWolfgang Ruf, Hans Loser, Klaus Lehleiter
Life of this patent
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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.
Claims7
A method for at least one of controlling and regulating a basis weight of a paper or cardboard web during the manufacturing process comprising:
- 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, whereby 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, separate from the first control loop, whereby the basis weight of the web is at least one of controlled and regulated.
Dependencies are inferred from the claim text.