Chatter is one of the most insidious issues that can develop on the Yankee dryer. It is a term that is often used to describe observations made about sheet, coating and Yankee surface defects. Its presence can lead to waste, lost time and result in increased maintenance and capital expenditures.
Conditions that lead to the appearance of chatter are often traced to doctor tip vibrations and are frequently related to mechanical issues or process operating conditions. Over the last decade the appearance of chatter on Yankee dryers has increased dramatically and most of the issues seem to
be related to the management of the creping process.
Once conditions exist that can cause the tip of the doctor blade to vibrate, the amplitude can be intensified by resonance responses with other machine components.
This review focuses on process driven chatter and discusses three areas surrounding this phenomena:
1) Mechanics (how it forms)
2) Monitoring (how to develop early warning)
3) Methods (practical ways to eliminate and/or avoid the appearance of chatter).
This is just the abstract of this article.
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