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US 2003/0171838 A1Published application
On-line fiber orientation closed-loop control
AssigneeABB AB
InventorsShih-Chin Chen, Ravi Subbarayan, Peter Q. Tran
Life of this patent
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Abstract
A controller to provide base level fiber orientation control of a paper web. The controller achieves one or more indices that are derived from the online measurements of a fiber orientation sensor of the fiber ratio and the fiber angle. The indices are used for control of the sheet forming processes. The controller may be implemented by a single or multi stage fuzzy controller or the combination of fuzzy controllers with non-fuzzy logic controllers.
Claims16
A method for the closed loop control of fiber orientation of a web in a papermaking process comprising the steps of:
- a) performing on-line measurements of said fiber orientation;
- b) transforming said on-line measurements to a plurality of indices;
- c) comparing each of said plurality of indices arising from said transformed on-line measurements with an associated target and deriving therefrom a deviation for each of said plurality of indices from said associated target;
- d) computing actions for controlling said fiber orientation based on said derived deviations and a response characteristic of said process;
- and
- e) executing said control actions to minimize said derived deviations.
3 more elements
Dependencies are inferred from the claim text.