Single-tier drying section tailored for compensating stretching and shrinking of paper web
AssigneeVoith Sulzer Papiermaschinen GmbH
InventorMarkus Oechsle
Life of this patent
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Abstract
A drying section for a paper making machine includes a larger number of dryer sections, fewer dryers in each dryer section, and provisions for driving many of the dryers individually. The average number of dryers per dryer section is less than five and preferably less than four. By providing a small number of dryers per dryer section and driving many of the dryers individually, it is possible to more precisely compensate for stretching of the paper web in the initial stages of the drying process and to more precisely compensate for shrinkage of the paper web during the latter stages of the drying process.
Claims5
A method for drying a paper web in a drying section of a papermaking machine, the method comprising the steps of:
- guiding the paper web through a drying section comprising a plurality of dryer sections, each dryer section including a number of dryers and a respective felt serving to press the paper web against the dryers, at least several of the dryers in at least several of the dryer sections being individually driven in a manner enabling dryer-to-dryer speed differentials within dryer sections;
- and
- adjusting dryer-to-dryer speeds between several of the individually driven dryers to compensate for stretching and/or shrinkage of the paper web.
Dependencies are inferred from the claim text.