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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


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


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


  • Annergren, G., Hagen, N. (2007) The Ljungberg textbook: Book 3, Paper chemistry and technology, Chapter 7—industrial beating/refining, ISSN 1654-1081, Pulp and paper chemistry and technology, KTH, Stockholm.Google Scholar

  • Åslund, P., Vomhoff, H. (2008) Dewatering mechanisms and their influence on suction box dewatering processes—A literature review. Nord. Pulp Pap. Res. J. 23(4), 389–397.CrossrefGoogle Scholar

  • Attwood, B. W. (1962) A study of vacuum box operation. Pap. Technol. 3(5), 44–53.Google Scholar

  • Bäckström, M., Kolar, M. C., Htun, M. (2008) Characterisation of fines from unbleached kraft pulps and their impact on sheet properties. Holzforschung 62(5), 546–552.Web of ScienceGoogle Scholar

  • Berthold, J., Salmén, L. (1997) Effect of mechanical and chemical treatments on the pore size distribution in wood pulps examined by inverse size-exclusion chromatography. J. Pulp Pap. Sci. 23, 245–253.Google Scholar

  • Cheng, Q., Wang, J., McNeel, J. F., Jacobson, P. M. (2010) Water retention value measurements of cellulosic materials using a centrifuge technique. BioResources 5(3), 1945–1954.Google Scholar

  • Danielsson, S., Lindström, M. E. (2005) Influence of birch xylan adsorption during kraft cooking on softwood pulp strength. Nord. Pulp Pap. Res. J. 20(4), 436–441.CrossrefGoogle Scholar

  • Granevald, R., Nilsson, L. B., Nilsson, L. S., and Stenström, S. (2003) Development of a laboratory apparatus for investigation of vacuum dewatering of low basis weight paper sheets. In: Proceedings of 2nd Nordic Drying Conference, Copenhagen, Denmark.Google Scholar

  • Kullander, J. (2012) Evaluation of furnishes for tissue manufacturing, Licentiate Thesis (ISSN 1403-8099), Faculty of Technology and Science, Chemical Engineering, Karlstad University, Karlstad.Google Scholar

  • Kullander, J., Nilsson, L., Barbier, C. (2012) Evaluation of furnishes for tissue manufacturing: Suction box dewatering and paper testing. Nord. Pulp Pap. Res. J. 27(1), 143–150.CrossrefGoogle Scholar

  • Laine J., Stenius P. (1997) Effect of charge on the fibre and paper properties of bleached industrial kraft pulps. Finn. Pap. Timber 79(4).Google Scholar

  • Laivins, G. V., Scallan, A. M. (1994) Removal of water from pulps by pressing, Part 1: Inter-and intra-wall water. Tappi J. 77(3), 125–131.Google Scholar

  • Laivins, G. V., Scallan, A. M. (1996) The influence of drying and beating of the swelling of fines. J. Pulp Pap. Sci. 22(5), 178–183.Google Scholar

  • Maloney, T. C., Paulapuro, H. (2001) Thermoporosimetry of pulp fibres, the science of papermaking. In: 12th Fundamental research symposium. Oxford, UK, Sep. 17–21. Vol. 2, pp. 897–926.Google Scholar

  • Molin, U., Teder, A. (2002) Importance of cellulose/hemicellulose-ratio for pulp strength. Nord. Pulp Pap. Res. J. 17(01), 014–019.CrossrefGoogle Scholar

  • Neun, J. A. (1994) Performance of high vacuum dewatering elements in the forming section. Tappi J. 77(9), 133–138.Google Scholar

  • Nilsson, L. (2014) Air flow and compression work in vacuum dewatering of paper. Dry. Technol. 32(1), 39–46.CrossrefWeb of ScienceGoogle Scholar

  • Paavilainen, L. (1990) Importance of particle size—the fibre length and fines-for the characterization of softwood kraft pulp. Finn. Pap. Timber 72(5), 516–526.Google Scholar

  • Pruden, B. (2005) The effect of fines on paper properties. Pap. Technol. 46(4), 19–26.Google Scholar

  • Rahman, H., Lindström, M. E., Sandstöm, P., Salmén, L., Engstrand, P. (2017) The effect of increased pulp yield using additives in the softwood kraft cook on the physical properties of low-grammage handsheets. Nord. Pulp Pap. Res. J. 32(3), 317–323.CrossrefWeb of ScienceGoogle Scholar

  • Rälsänen, K. O. (2000) Vacuum systems. In: Papermaking Part 1, Stock preparation and wet end. Ed. Paulapuro, H. Fapet, Helsinki, pp. 416–430.Google Scholar

  • Rantanen, J., and Maloney, T. (2013) Press dewatering and nip rewetting of paper containing nano- and microfibril cellulose. Nord. Pulp Pap. Res. J. 28(4), 582–587.CrossrefGoogle Scholar

  • Retulainen, E., Luukko, K., Fagerholm, K., Pere, J., Laine, J., Paulapuro, H. (2002) Paper making quality of fines from different pulps-the effect of size, shape and chemical composition. Appita J. 55(6), 457–467.Google Scholar

  • Rydholm S.. Pulping processes, Interscience Publishers, John Wiley and Sons, New York, London, Sydney, pp. 1122–1124, 1965.Google Scholar

  • Sirviö, J., Nurminen, I. (2004) Systematic changes in paper properties caused by fines. Pulp Pap. Can. 105, 39–42.Google Scholar

  • Sjöstrand, B., Barbier, C., Nilsson, L. (2015) Rewetting after high vacuum suction boxes in a pilot paper machine. Nord. Pulp Pap. Res. J. 30(4), 667–672.CrossrefGoogle Scholar

  • Wang, X. (2006) Improving the papermaking properties of kraft pulp by controlling hornification and internal fibrillation, Dissertation, Helsinki University of Technology, Laboratory of paper and Printing Technology, Espoo, Finland.Google Scholar

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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