Machine direction control The key machine-direction (MD) quality control system on paper machines is that of simultaneously managing basis weight, filler content, moisture, and retention/white water concentration. Although retention is not a quality parameter of paper directly, it strongly affects the web structure, and thus indirectly paper formation, surface and water/ink absorption. Furthermore, retention affects
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Machine direction control
After reading this article you will..
- learn the basic problems in MD control.
- learn the use of Model Predictive Control (MPC) in MD control.
Content
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:
- Kosonen, M., Fu, C., Nuyan, S., Kuusisto, R., Huhtelin, T. 2002. Narrowing the gap between theory and praxis: Mill experiences with multivariable predictive control. In: Proceedings Control Systems 2002. Stockholm, June 3–5. SPCI. pp 54–59.
- Soeterboek, R. 1992. Predictive control: A unified approach. Prentice-Hall.
- Kwon, W.H. and Han S. 2005. Receding horizon control. Springer. 380 p.
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This page has been updated 15.11.2020
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