Paper making and fiber liberation – Processes and products – With measuring – inspecting and/or testing
Patent
1995-08-24
1997-08-19
Czaja, Donald E.
Paper making and fiber liberation
Processes and products
With measuring, inspecting and/or testing
162253, 162263, 162266, 162DIG10, 73159, 36447101, 36447102, 36447103, D21F 706, D21F 106
Patent
active
056584326
ABSTRACT:
A method for determining the cross-machine shrinkage or expansion profile of a travelling sheet produced in a sheetmaking machine between an upstream location and a downstream location. The method involves marking the sheet at the upstream location with an array of marks at measured, predetermined intervals in the cross-machine direction. The sheet is inspected in the cross-machine direction at the downstream location to measure the spacing of the array of marks. A shrinkage or expansion profile of the travelling sheet is developed based on the changes in the spacing between the array of marks at the downstream location. Apparatus for carrying out the method is also disclosed. The method and apparatus of the present invention permit rapid and precise determination of the sheet shrinkage or expansion profile to allow for better control of property variation across the sheet.
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W. L. Bialkowski and Alan D. Weldon; The Digital future of process control; possibilities, limitations, and ramifications; Oct. 1994; pp. 69-75; vol. 77, No. 10 Tappi Journal; Technical Association of the pulp and paper industry.
Crumpacker Scott B.
Heaven Edwin Michael Gyde
Czaja Donald E.
Fortuna Jon A.
Measurex Devron Inc.
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