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Automatisk reglering av färgnyans på pappret i en pappersmaskin

Johnsson, Per (2015)
Department of Automatic Control
Abstract
This paper deals with design and implementation of a regulator to control the tint of the paper on Stora Enso Nymölla AB’s paper machines. The paper industry is a major industrial area in Sweden with continuous processes running around the clock with as short downtime as possible, which places special demands on the running and testing of controllers. The paper machine is in many cases the bottleneck of production so small improvements often have great effect. To improve the overall efficiency of the paper machine a regulator has been made to reduce the downtime at grade changes. The controller is designed for programmable logic controllers in Metso DNA system’s fbCAD and a GUI has been designed for the machine operators. Tests on the... (More)
This paper deals with design and implementation of a regulator to control the tint of the paper on Stora Enso Nymölla AB’s paper machines. The paper industry is a major industrial area in Sweden with continuous processes running around the clock with as short downtime as possible, which places special demands on the running and testing of controllers. The paper machine is in many cases the bottleneck of production so small improvements often have great effect. To improve the overall efficiency of the paper machine a regulator has been made to reduce the downtime at grade changes. The controller is designed for programmable logic controllers in Metso DNA system’s fbCAD and a GUI has been designed for the machine operators. Tests on the paper machines show that an Otto-Smith predictor and associated controller can make grade changes significantly shorter with the result that less paper must be discarded than with the previous manual control strategy. A sufficient number of tests to ensure statistically how much the downtime decreases have not been made but the few that have been made show a decrease of downtime by 50 % at color grade changes compared to when they are done manually. (Less)
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author
Johnsson, Per
supervisor
organization
year
type
H3 - Professional qualifications (4 Years - )
subject
other publication id
ISRN LUTFD2/TFRT--5962--SE
language
Swedish
id
5043254
date added to LUP
2015-02-04 11:29:50
date last changed
2015-02-04 11:29:50
@misc{5043254,
  abstract     = {This paper deals with design and implementation of a regulator to control the tint of the paper on Stora Enso Nymölla AB’s paper machines. The paper industry is a major industrial area in Sweden with continuous processes running around the clock with as short downtime as possible, which places special demands on the running and testing of controllers. The paper machine is in many cases the bottleneck of production so small improvements often have great effect. To improve the overall efficiency of the paper machine a regulator has been made to reduce the downtime at grade changes. The controller is designed for programmable logic controllers in Metso DNA system’s fbCAD and a GUI has been designed for the machine operators. Tests on the paper machines show that an Otto-Smith predictor and associated controller can make grade changes significantly shorter with the result that less paper must be discarded than with the previous manual control strategy. A sufficient number of tests to ensure statistically how much the downtime decreases have not been made but the few that have been made show a decrease of downtime by 50 % at color grade changes compared to when they are done manually.},
  author       = {Johnsson, Per},
  language     = {swe},
  note         = {Student Paper},
  title        = {Automatisk reglering av färgnyans på pappret i en pappersmaskin},
  year         = {2015},
}