Controlling functional paper properties Many quality parameters cannot be measured on-line. Off-line measurements are made either in the laboratory according to standards or de facto standards, or with automated analysers not conforming strictly to standards but only emulating them. The laboratory measurements are manual work that is rather expensive. Thus, a quality property is measured
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Controlling functional paper properties
After reading this article you will..
- learn the use of off-line measurements in control.
- learn some points in using SPC/SQC methods.
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:
- MacGregor, J.F. and Kourti, T. 1995. Statistical process control of multivariate processes. Control Engineering Practice 3(3):403–414.
- Martin, E.B., Morris, A.J., Bissessur, Y. and Weighell, M. 1998. Multivariate statistical process control and fault detection (Applications in industrial film production and paper making). In: Proceeding of Control Systems 1998. Porvoo, Finland, September 1–3. pp. 119–133.
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This page has been updated 23.11.2020
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