Fast basis weight control for papermaking machine

Details Fast basis weight control for papermaking machine Fast basis weight control for papermaking machine

D - Textiles, Paper

21

F

D21F 1/06 (2006.01) D21F 1/02 (2006.01) D21G 9/00 (2006.01) G01G 13/24 (2006.01) G05D 5/00 (2006.01)

Patent

CA 2259029

Apparatus and process for controlling the basis weight of paper produced in a papermaking machine are provided. In papermaking, a major portion of paper stock flows through a first line controlled by a thick stock valve and a minor portion of the stock flow from the stuff box to the headbox is diverted through a second line regulated by a second valve. The thick stock valve is controlled by the dry end basis weight and the second valve is responsive to measurements of the basis weight of the wet stock at the wire. The second line and control valve along with the wet end basis weight measurements form a fine control loop with fast response time whereas the first line and control valve that is responsive to dry end basis weight measurements form a course control loop. The dual control loops enable fast and actual basis weight control.

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