D - Textiles – Paper – 21 – G
Patent
D - Textiles, Paper
21
G
92/6
D21G 1/00 (2006.01) D21F 3/06 (2006.01)
Patent
CA 1282619
METHOD AND APPARATUS FOR CONTROLLING A ZONE-ADJUSTABLE ROLL OR THE LIKE ABSTRACT OF THE DISCLOSURE Method and apparatus for controlling the transverse distribution of pressure applied to a web passing through a nip formed between a pressure zone-adjustable device having a first number (K) of separately adjustable pressure zones, including those for roll loading cylinders, if any, and a counter-member. A desired linear load profile comprising a second number (N) of setting zone set values for a corresponding number (N) of setting zones is provided, the second number (N) of the setting zones being substantially greater than the first number (K) of actual pressure zones. The second number (N) of setting zone set values are input to a zone conversion unit which is programmed with a mathematical model of the nip and are converted to a first number (K) of actual zone set values so that an actual transverse distribution of pressure applied to the web is obtained having a minimal deviation from the setting zone set value distribution. In particular, the first number (K) of actual zone set values are input into an intelligent regulating unit provided with diagnostic and protection logic so as to constitute set values for actual zone pressures. Each of the loading members or loading member groups of the nip to be controlled is controlled separately by means of the actual zone set values. -1-
559590
Sim & Mcburney
Valmet Paper Machinery Inc.
LandOfFree
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