Presses – Methods
Patent
1987-08-14
1988-12-20
Falik, Andrew M.
Presses
Methods
100 47, 100162B, 100170, 72243, 291132, B30B 304, B30B 1526
Patent
active
047918632
ABSTRACT:
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 pressure zone set values so than 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 pressure zone set values are input into an intelligent regulating unit provided with diagnostic and protection logic so as to constitute set values for desired zone pressures. The pressure applied to each of the loading members or loading member groups of the nip to be controlled is determined separately by respective pressure zone set values.
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Cadzow, J. A. and Martens, H. R., Discrete-Time and Computer Control Systems, Prentice-Hall, Inc. N.J., 1970, pp. 286-299.
Falik Andrew M.
Valmet Paper Machinery Inc.
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