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Nordic Pulp & Paper Research Journal

The international research journal on sustainable utilization of forest bioresources

Editor-in-Chief: Lindström, Tom


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Volume 33, Issue 3

Issues

Dewatering properties of low grammage handsheets of softwood kraft pulps modified to minimize the need for refining

Hafizur Rahman
  • Corresponding author
  • SCA R&D Centre, Sidsjövägen 2, P. O. Box 716, SE-851 21 Sundsvall, Sweden
  • present address: FSCN Mittuniversitetet, SE-851 70 Sundsvall, Sweden
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/ Per Engstrand / Peter Sandström / Björn Sjöstrand
Published Online: 2018-08-04 | DOI: https://doi.org/10.1515/npprj-2018-3037

Abstract

Previous paper (Rahman et al. 2017) showed that the yield of softwood kraft pulp increased by the addition of either polysulfide or sodium borohydride because of higher hemicellulose retention. An increase in hemicellulose content can make dewatering more difficult as WRV of the pulp increases, but instead, an overall increase in pulp yield could improve dewatering as a sheet of a certain weight will contain fewer fibres, giving a more open sheet structure. It was therefore of interest to measure the dewatering properties of low grammage handsheets (20 g/m2) under conditions mimicking the tissue paper machine dewatering processes, and sheet strength properties, WRV, °SR and fibre dimensions were also studied. The results showed that the positive influence of overall yield increase dominated over the negative influence of an increase in hemicellulose content on the dewatering properties, particularly at lower refining energy levels. Moreover, higher yield and higher hemicellulose content pulps had a higher tensile index at the same dryness. A given tensile index was achieved with less refining energy. The results indicate that increased yield and hemicellulose content by modification of the kraft pulping process will result in a pulp with a potential to improve tissue paper quality.

Keywords: dwell time; hemicellulose; refining; solid content; suction box dewatering; tensile index; thermoporosimetry; water retention value

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About the article

Received: 2018-01-03

Accepted: 2018-03-25

Published Online: 2018-08-04

Published in Print: 2018-09-25


This work was conducted with the support of the Forest as a Resource Industrial College (FORIC) at Mid Sweden University and the Swedish Knowledge foundation in collaboration with SCA Forest Products and Mid Sweden University for financial support of the study.


Conflict of interest: The authors declare that there is no conflict of interests related to this article.


Citation Information: Nordic Pulp & Paper Research Journal, Volume 33, Issue 3, Pages 397–403, ISSN (Online) 2000-0669, ISSN (Print) 0283-2631, DOI: https://doi.org/10.1515/npprj-2018-3037.

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