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Polymers 2017, 9(8), 366;

Pulp Fines—Characterization, Sheet Formation, and Comparison to Microfibrillated Cellulose

Institute of Paper, Pulp and Fibre Technology, Graz University of Technology, Inffeldgasse 23, 8010 Graz, Austria
Sappi Paper GmbH, Brucker Str. 21, 8101 Gratkorn, Austria
Zellstoff Pöls AG, Doktor-Luigi-Angeli-Straße 9, 8761 Pöls, Austria
Department of Materials Sciences and Process Engineering, Institute ofWood Technology and Renewable Materials, University of Natural Resources and Life Sciences Vienna, Konrad-Lorenz-Straße 24, 3430 Tulln, Austria
Institute for Electron Microscopy and Nanoanalysis, NAWI Graz, Graz University of Technology and Centre for Electron Microscopy, 8010 Graz, Austria
Author to whom correspondence should be addressed.
Received: 28 July 2017 / Revised: 13 August 2017 / Accepted: 13 August 2017 / Published: 17 August 2017
(This article belongs to the Special Issue Cellulose Nanomaterials)
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In the pulp and paper industry different types of pulp or fiber fines are generated during the pulping (primary fines, mechanical fines), and/or the refining process (secondary fines). Besides fibers, these cellulosic microparticles are a further component of the paper network. Fines, which are defined as the fraction of pulp that is able to pass through a mesh screen or a perforated plate having a hole diameter of 76 μm, are known to influence the properties of the final paper product. To better understand the effect and properties of this material, fines have to be separated from the pulp and investigated as an independent material. In the present study, fines are isolated from the pulp fraction by means of a laboratory pressure screen. To allow for further processing, the solids content of the produced fines suspension was increased using dissolved air flotation. Morphological properties of different types of fines and other cellulosic microparticles, such as microfibrillated celluloses (MFC) are determined and compared to each other. Furthermore, handsheets are prepared from these materials and properties, such as apparent density, contact angle, modulus of elasticity, and strain are measured giving similar results for the analyzed types of fines in comparison to the tested MFC grades. The analysis of the properties of fiber fines contributes on the one hand to a better understanding of how these materials influences the final paper products, and on the other hand, helps in identifying other potential applications of this material. View Full-Text
Keywords: pulp fines; fiber fines; microfibrillated cellulose; sheet forming; vacuum filtration; tensile properties; contact angle; surface roughness pulp fines; fiber fines; microfibrillated cellulose; sheet forming; vacuum filtration; tensile properties; contact angle; surface roughness

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Fischer, W.J.; Mayr, M.; Spirk, S.; Reishofer, D.; Jagiello, L.A.; Schmiedt, R.; Colson, J.; Zankel, A.; Bauer, W. Pulp Fines—Characterization, Sheet Formation, and Comparison to Microfibrillated Cellulose. Polymers 2017, 9, 366.

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