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The effect of increased pulp yield using additives in the softwood kraft cook on the physical properties of low-grammage handsheets
SCA R&D Centre, Sweden.
KTH Royal Institute of Technology, Sweden.
SCA R&D Centre, Sweden.
RISE - Research Institutes of Sweden, Bioeconomy.ORCID iD: 0000-0003-3534-1107
Show others and affiliations
2017 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 32, no 2, p. 317-323Article in journal (Refereed) Published
Abstract [en]

The effect of increasing the pulp yield by the addition of sodium borohydride (NaBH4) or polysulfide (PS) in softwood kraft cooking, i.e. enhancing the retention of glucomannan, on the physical properties of low-grammage handsheets was studied. In addition to the yield improvement, an increase in tensile index was observed, especially at lower degrees of beating. These higher yield pulps showed an increase in pore volume, indicating an increased degree of swelling of the fibres. Presumably, the increased flexibility of the fibres affects the bonding strength and leads to the higher tensile index observed.

Place, publisher, year, edition, pages
2017. Vol. 32, no 2, p. 317-323
Keywords [en]
kappa number, polysulphide, tensile strength, porosimeter, z direction strength, softwood, handsheet, physical properties, yield
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-32950DOI: 10.3183/NPPRJ-2017-32-03-p317-323OAI: oai:DiVA.org:ri-32950DiVA, id: diva2:1170167
Available from: 2018-01-02 Created: 2018-01-02 Last updated: 2018-08-23Bibliographically approved

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