The flow resistance of fiber sheet during initial dewatering

• Published in: Drying technology Vol. 34; no. 12; pp. 1521 - 1533
• Main Authors: Koponen, Antti, Haavisto, Sanna, Liukkonen, Johanna, Salmela, Juha
• Format: Journal Article
• Language: English
• Published: Philadelphia Taylor & Francis 09-09-2016; Taylor & Francis Ltd
• Subjects: Dewatering; Drying; Drying agents; Electrical resistivity; Fibers; Filtration; Flow resistance; Forming; paper dewatering; Pulp & paper industry; pulp drainage; Sheets
• ISSN: 0737-3937; 1532-2300
• DOI: 10.1080/07373937.2015.1132427

In this work, a novel experimental filtration device with pressure profiling was used for analyzing water removal from the fiber network in the forming section of a paper machine. The experimental data were used to develop a stratified model for the flow resistance of the developing fiber sheet during the filtration process. The new model was verified with both laboratory- and pilot-scale measurements and excellent agreement was observed between them. It was also observed that there is a strong linear correlation between the maximal attainable solid content of a filtered sheet after the forming section and the instantaneous response to pressure of the flow resistivity of the furnish.