Equilibrium moisture content  in wet pressing of paper, TAPPI Journal July 2020



Application: The ultimate dryness possible in wet pressing is related to the structure of the fiber wall. Understanding how to modify this structure to improve water removal without affecting pulp strength is the key to higher pressed dryness.

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Author: Richard J. Kerekes and J. David McDonald
Equilibrium moisture content in wet pressing of paper, TAPP
ABSTRACT: Equilibrium moisture is a limiting factor in achieving high solids in the later stages of pressing or pressing low basis weight grades. We have developed a model that relates equilibrium moisture directly to the pore size distribution of fibers as measured by the solute exclusion technique. The model shows that chemical pulping and refining increase equilibrium moisture by increasing pore volume at given pore sizes in fibers, which leads to lower pressed solids and greater energy expenditure in the dryer section. Means to increase equilibrium moisture without compromising pulp strength are briefly discussed.
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