Regulations system in a paper machine for controlling variation

Details Regulations system in a paper machine for controlling variation Regulations system in a paper machine for controlling variation

1997-03-14

1999-08-31

Silverman, Stanley S.

Paper making and fiber liberation

Apparatus

Automatic control

162259, 162253, 162DIG11, 36447102, D21F 108

Patent

active

059449578

ABSTRACT:
A regulation system and method in a paper machine for controlling the variation of the basis weight of a paper web in the machine direction in which the basis weight profile of the web is measured by means of a measurement device and a basis weight regulation system receives a signal of the measurement of the basis weight from the measurement device and generates a regulation signal for controlling the flow of thick stock passed into a short circulation circuit in the paper machine by a basis weight valve and/or a regulation pump. The variation of the basis weight in the machine direction in the paper machine is controlled, besides by the short circulation circuit of regulation, also by a substantially faster second circuit of regulation which comprises one or more actuators for controlling the flow rate of the dilution water flow in the dilution profiling system of the headbox and/or the consistency of the dilution water flow across the entire width of the paper web.

REFERENCES:
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patent: 3619360 (1971-11-01), Persik, Jr.
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patent: 3981767 (1976-09-01), Al-Shaikh
patent: 5196091 (1993-03-01), Hergert
patent: 5549793 (1996-08-01), Hellstrom et al.
patent: 5603806 (1997-02-01), Kertulla
patent: 5611891 (1997-03-01), Hundley, III
Introduction to Control Theory with Applications to Process Control, Lowell B. Koppel, Prentice-Hall, Inc. , 1968, pp. 23-33.

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