Paper making and fiber liberation – Processes and products – Conditioning – preparing or repairing of apparatus
Patent
1998-04-14
2000-11-21
Chin, Peter
Paper making and fiber liberation
Processes and products
Conditioning, preparing or repairing of apparatus
162252, 162253, 162254, 162256, 162257, 162258, 162259, 162DIG11, 162263, D21F 132
Patent
active
061497703
ABSTRACT:
A system and method of providing on-line turbulence measurements in a sheetmaking machine and using these measurements to perform on-line adjustments to turbulence-inducing and adjusting elements in the sheetmaking machine to optimize final sheet product quality. Turbulence measurements are obtained using water weight sensors in the wet-end of the sheetmaking machine and specifically under wire water weight measurements. Water weight readings are correlated to turbulence intensity levels by correlating ranges of water weights to intensity level intervals. A turbulence processing sensor sorts accumulated water weight measurement readings into intensity level intervals to obtain turbulence measurements or a turbulence profile. The turbulence measurements or profile is provided to a machine element controller which uses the measured turbulence information and target turbulence information to generate control signals. The water weight sensors can obtain independent machine direction (MD) and cross direction (CD) water weight measurements and consequently independent turbulence measurements can be determined so that turbulence can be controlled in both directions. Machine elements are controlled so that turbulence remains uniform across the CD and so that the MD turbulence profile is optimized to resemble a target profile.
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Chase Lee
Goss John D.
Hagart-Alexander Claud
Hu Hung-Tzaw
Watson David
Chin Peter
Honeywell-Measurex Corporation
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