Cross-directional control – Dynamics CD control is very slow for three reasons: A change in profile estimate builds over 4–10 scans when standard profile averaging and filtering techniques for CD/MD separation are applied. When the change is due to a control action made, the building of the effect on the profile can be speeded up
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Cross-directional control – Dynamics
After reading this article you will..
- learn the reason for slow dynamics of CD 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.
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This page has been updated 15.11.2020
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