Cross-directional control – Further aspects Dilution control In dilution control of basis weight, the dilution water is usually taken from the wire pit. Thus, the dilution water contains fibres and fillers in amounts determined by retention. If dilution flow is applied so that its ratio to the total flow from headbox is D, the basis
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Cross-directional control – further aspects
After reading this article you will..
- learn the possibilities and difficulties of different strategies for basis weight control.
- learn, how to do basis weight control in the case of multiply grades.
Process control and automation
- Introduction to process control and automation
- Development of process automation
- Fibre process automation
- Chemical recovery as a control object
- Advances in paper machine automation
- Paper machine as a dynamical system
- Tasks in paper machine control and management
- Control of stock flow concentration and quality
- Machine direction control
- Cross-directional control – The static optimisation
- Cross-directional control – Dynamics
- Cross-directional control – further aspects
- Controlling functional paper properties
- Managing grade chances in the paper machine
- Managing disturbances caused by broke and recovered solids
- Millwide systems
- Modelling and control methods
Authors & references
Edited by:
Risto Ritala, Tampere University
Based on: Ritala, R., Managing paper machine operation (Chapter 8). In: Leiviskä, K. (ed), Process and Maintenance Management, (Book 14), Papermaking Science and Technology. 2nd edition. Jyväskylä, 2009, Paper Engineer’s Association/Paperi ja Puu Oy. pp. 189–234.
References:
- Nissinen, A. 1999. Stability of wet end for paper machines with dilution headboxes. PhD thesis. Tampere University of Technology.
- Odell M. and Pakarinen P. 2001. The complete fibre orientation control and effects on diverse paper properties. In: 2001 TAPPI papermakers’ Conference. Cincinnati, OH, March 11–14. 27 p.
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This page has been updated 15.11.2020
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