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Effect of temperature and moisture content on paper behavior in the nip.

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Uniformity of paper thickness and surface properties is a key factor determining the end-use performance of paper. For many grades of paper, calendering is the final processing step where uniformity of paper properties can be controlled.

In this study, we measured the effect of temperature and moisture content on the behavior of paper in the nip of a calender. We found that uncalendered paper thickness was dependent on both paper temperature and moisture content. The theological behavior of commercial newsprint made from thermomechanical pulp was a strong nonlinear function of temperature and moisture content over the conditions investigated. The relationship between permanent and in-nip strain is dependent on paper temperature and moisture content as well as line load. This relationship is valuable for estimating local in-nip strain for a given local permanent strain.
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Title Annotation:Calendering
Author:Douglas, W.J. Murray
Publication:Solutions - for People, Processes and Paper
Date:Dec 1, 2002
Words:162
Previous Article:Some properties of newsprint impregnated with polyvinylamine.
Next Article:Effect of geometry, and thermal boundary conditions on calender roll thermal deformation.


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