Fast basis weight control for papermaking machine

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

1998-01-15

1999-08-31

Chin, Peter

Paper making and fiber liberation

Processes and products

With measuring, inspecting and/or testing

162252, 162253, 162258, 162259, 162DIG6, 162DIG11, D21F 106, D21F 108, D21F 700

Patent

active

059449551

ABSTRACT:
Apparatus and process for controlling the basis weight of paper produced in a papermaking machine are provided. In the papermaking process, a major portion of the paper stock flows through a first line that is 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 that is regulated by a second valve (e.g., vernier valve). The thick stock valve is controlled by the dry end basis weight and the second valve 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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