Two new automatic control systems for paper machines are described. The first is concerned with moisture variations across the width of the paper machine using variable crown rolls in the press section to level the profile. The theory of variable crown rolls, control strategy and operating experience are discussed. The system makes use of the "true" moisture profile to calculate optimum conditions for minimizing the moisture profile variability. The measurements are provided by a scanning on-line infrared gauge. SADACOLOR, the second control system to be described is based on Reed's original stand-alone sampled data controller SADAC, but includes colour display of cross machine variables and multirate sample and control techniques. The successful application of these techniques has led us to develop a new stand-alone sampled data controller SADAC-M which is microprocessor based and should have a wide industrial appeal.
S. Hem, S. Hem,
"Moisture Control Using New Control Systems For Paper Machines", Proc. SPIE 0197, Modern Utilization of Infrared Technology V, (17 December 1979); doi: 10.1117/12.958003; https://doi.org/10.1117/12.958003