Paper making and fiber liberation – Processes and products – With measuring – inspecting and/or testing
Patent
1993-01-28
1994-04-05
Alvo, Steve
Paper making and fiber liberation
Processes and products
With measuring, inspecting and/or testing
162258, D21C 108, D21C 706
Patent
active
053001931
ABSTRACT:
Papermachine stock consistency is regulated while carried along a forming wire table. A variable draft vacuum box disposed beneath the forming wire to draw water from the wire carried stock is automatically adjusted in response to the summation of signals from several sources. A radioactive mass measuring gauge having a sensor head positioned beneath the forming wire downstream of the vacuum box provides a signal value indicative of the total mass carried above the sensor head. From this mass measuring gauge signal is deducted a value representative of the wire mass; the remainder representing the stock mass comprising a mixture of fiber and water. The quantity of fiber in the stock mixture, independent of the water, is determined by a dry basis weight measure of paper made from the stock. A signal value representative of the fiber basis weight is divided by the stock mass signal value to yield a consistency signal value. The consistency signal value is compared to a set-point signal value for determination of a vacuum box control signal.
REFERENCES:
patent: 2922475 (1960-01-01), Alexander
patent: 4145249 (1979-03-01), Hansen
patent: 5026455 (1991-06-01), Lehtikoski et al.
NDC Model 104-Mass Measurement Gage User Manual, NDC Systems, 730 East Cypress, Monrovia, Calif. 91016, rev. 2566, Dec. 12, 1988.
TAPPI Standard TIS 014-7-"Evaluating the drainage performance of a fourdrinier," rev. 1988.
Rule, Jr. James A.
Sanford Jeffery S.
Wall Allen C.
Alvo Steve
Marcontell W. A.
McDaniel J. R.
Schmalz R. L.
Westvaco Corporation
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