Analyses of the effects of fiber diameter, fiber fibrillation, and fines content on the pore structure and capillary flow using laboratory sheets of regenerated fibers
Source abstract
Abstract
Abstract The aim of this work is to investigate the influence of fiber fibrillation and fines on the pore structure of well-defined regenerated fiber sheets as well as the water flow through the sheet. For this purpose, sheets were produced with refined, fibrillated fibers only, with unfibrillated fibers and fines, as well as with fibrillated fibers and fines. Next, the samples were analyzed by brightfield and fluorescence microscopy, mercury porosimetry, and an ascending test. Both the fibrils and the added fines reach into the pores between the fibers or are deposited there. As a result, pore size decreases and capillary flow slows down. The two effects overlap when the fiber surface is fibrillated and fines are present. Sheets with thicker fibers form a pore structure with larger pores in between the fibers. However, such a change in pore size has no significant influence on the flow of water through the sheet in the performed ascending tests. It is shown that a statistical model with the parameters fibrillation and fines content can be used to describe the ascending rate nearly as well as the Lucas–Washburn equation. Consequently, the equation could be improved by the addition of further fiber and sheet properties.
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Research context
OpenAlex topics: Material Properties and Processing · Advanced Cellulose Research Studies · Textile materials and evaluations
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Affiliations
Department of Mechanical Engineering, Chair of Paper Technology and Mechanical Process Engineering , University of Darmstadt , Alexanderstraße 8, 64283 Darmstadt , Germany
Ernst-Berl Institut für Technische und Makromolekulare Chemie; Macromolecular and Paper Chemistry, Technische Universität Darmstadt , Peter-Grünberg-Straße 8, 64287 Darmstadt , Germany
Funding
Deutsche Forschungsgemeinschaft
References (58)
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