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Title:
METHOD FOR CONTROLLING DISTRIBUTION OF PRESSURE LOAD TO MATERIAL WEB, AND MATERIAL WEB TREATMENT APPARATUS AND ADJUSTMENT OF PRESSURE TREATMENT NIP
Document Type and Number:
Japanese Patent JPS63295788
Kind Code:
A
Abstract:
Method and equipment for regulating an extended press treatment nip (Np). By means of the method, the transverse treatment-pressure distribution of the material web (W) passing through the nip (Np) is controlled by using a series of power members. In the method a regulating system (100, 200, 300, 400) is used, by means of which the effective powers of the power members are regulated separately. Further, a mathematical model illustrating the nip (Np) to be regulated and the web (W) to be treated is created. A set value distribution Q(Z) of the pressure profile of the nip is determined, wherein Z = 1....N and (N) is chosen as substantially larger than the number (K) of the separately adjustable power members or power member groups. On the basis of the mathematical model, a zone conversion block (120) is programmed, whose input quantities consist of set line pressures (Q1...QN) and whose output quantities consist of zone-pressure set values (P1...PK). The zone conversion is programmed so that such a linear-load profile of the material web (W) can be accomplished whose deviations from the set value profile Q(Z) are minimized. The converted zone-pressure set values (P1...PK) are passed into an intelligent regulating unit (300) provided with diagnostic and protection so as to constitute set values (B) for zone pressures. Each of the power members or power member groups of the nip (Np) to be regulated is regulated separately by means of the set values (B).

Inventors:
HARI BAHATARO
Application Number:
JP3877288A
Publication Date:
December 02, 1988
Filing Date:
February 23, 1988
Export Citation:
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Assignee:
VALMET PAPER MACHINERY INC
International Classes:
F16C13/00; D21F3/02; D21F3/06; D21G1/00; (IPC1-7): D21F3/06; D21G1/00; F16C13/00
Attorney, Agent or Firm:
Takao Katori