Managing grade changes in the paper machine Grade changes can be divided roughly into three categories: The largest grade changes involving changing the entire material flow composition, grade changes with replacing some of the material components or changing furnish composition, and small grade changes of material flow, e.g. basis weight and filler content. The largest
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Managing grade chances in the paper machine
After reading this article you will..
- learn the principles of managing grade changes in the paper machine.
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
Authors:
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:
- Murphy, T.F., Rick, P. and Chen, S.-C. 2004. Reducing production loss from paper grade change. In: Proceedings of TAPPI Process Control. pp. 175–181.
- Shasaki, T., Ken-ichiro, Y., Takao, M. and Mori, Y. 2002. A new grade change control that uses the process model of dryers in paper machines. In: Proceedings of Control Systems 2002. Stockholm, June 3–5. SPCI. pp. 293–297.
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This page has been updated 15.11.2020
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