Paper making and fiber liberation – Processes and products – With measuring – inspecting and/or testing
Patent
1998-01-27
2000-06-27
Hoffmann, John
Paper making and fiber liberation
Processes and products
With measuring, inspecting and/or testing
162252, 162253, 162254, 162255, 162256, 162257, 162258, 162259, 162262, 162DIG10, 162DIG11, D21F 1100
Patent
active
060802782
ABSTRACT:
A system and method of providing fast machine direction (MD) and cross direction (CD) basis weight adjustments using a simultaneous multi-point water weight sensor which provides independent MD and CD measurements is described. The water weight sensor is placed under the wire of the sheetmaking machine and provides fast wet end water weight measurements which are converted into predicted dry end basis weight information and used to control operating variables of machine elements in the sheetmaking machine to compensate for high frequency process variations. MD wet end measurements are used to control operating variables of machine elements that influence the MD dry end basis weight and CD wet end measurements are used to control operating variables of machine elements that influence CD dry end basis weight. The fast control information provided by the non-scanned water weight sensor can be used in a fast control loop which provides feedback information to wetstock source, headbox and forming elements and which can be used with a slower response control loop including a dry end sensor which provides a slower basis weight measurement and which controls system variables to compensate for larger basis weight fluctuations.
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Chase Lee
Goss John D.
Hagart-Alexander Claud
Heaven E. Michael
Watson David
Hoffmann John
Honeywell-Measurex Corporation
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