Modeling and Evaluation of Paper Machine Coater Sections Part 1: 1-Coater Section and Tension Setpoints

• Published in: IEEE transactions on industry applications Vol. 55; no. 2; pp. 2144 - 2154
• Main Authors: Ramirez A., Guillermo, Valenzuela, M. Anibal, Pittman, Steve, Lorenz, Robert D.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.03.2019; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: AC drives tension control; Alternating current; Braking; coater section; Coating effects; Coatings; Current control; Elastic properties; Load modeling; Mathematical model; multispan; paper machine; Paper machines; Powertrain; Pulp & paper industry; pulp and paper industry; Regeneration; Sheet modelling; Torque; Transient analysis; Velocity control
• ISSN: 0093-9994; 1939-9367
• DOI: 10.1109/TIA.2018.2878689

Coater sections are challenging to tune during the commissioning of a paper machine. This paper presents a detailed mechanical-electrical model of a 1-coater section, which includes a linear, operating point model of the sheet in the different spans, all the drivetrain components, and the vector-controlled ac drives. The sheet model considers tail widening as well as the effect of coating and drying on the sheet elastic constant, activation of the torque current control, and the beginning of coating. The developed model allows for complete evaluation of the different transient events including paper slack due to load impacts. Results show that the best performance of the drives is obtained operating the spans with even sheet tensions, which reduces and/or eliminates the operation of the drives in regeneration or braking zones.