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Differences and similarities between kraft and oxygen delignification of softwood fibers: effects on mechanical properties
RISE Research Institutes of Sweden, Bioeconomy and Health, Pulp, Paper and Packaging.ORCID iD: 0000-0002-0816-0047
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
RISE Research Institutes of Sweden, Bioeconomy and Health, Pulp, Paper and Packaging.ORCID iD: 0000-0002-8992-3623
2021 (English)In: Cellulose, ISSN 0969-0239, E-ISSN 1572-882X, Vol. 28, p. 3775-3788Article in journal (Refereed) Published
Abstract [en]

Charged groups in pulp have been shown to enhance the tensile strength of the paper produced from the pulp. Oxygen delignification introduces charged groups and it is of interest to determine how the delignification should be distributed between the cooking and the oxygen stage with respect to mechanical properties. A number of unbleached kraft cooked and oxygen delignified pulps within a wide kappa number range were produced and refined, and the effects of the refining on the morphology and mechanical properties were studied. The WRV correlated with the fiber charge and at a given fiber charge, kraft cooked and oxygen delignified pulps had the same WRV development in refining, although they had significantly different kappa numbers. The tensile strength development during refining depends on the fiber rigidity which is affected by the lignin content, the fiber charge and the chemical and mechanical processes used. Refining increased the curl of the kraft cooked pulps and decreased the curl of oxygen delignified pulps, irrespective of kappa number. A greater increase in tensile strength was seen for the pulps with a higher fiber charge and WRV, probably because of the greater degree of fibrillation achieved in the beating process. Despite the greater fiber deformation in the oxygen delignified pulps, the strength can be increased by a larger amount of charged groups and a greater swelling of the fibers. Graphic abstract: [Figure not available: see fulltext.] © 2021, The Author(s).

Place, publisher, year, edition, pages
Springer Science and Business Media B.V. , 2021. Vol. 28, p. 3775-3788
Keywords [en]
Bonding, Conformation, Curl index, Fibrillation, Refining, Strength, Swelling
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-52900DOI: 10.1007/s10570-021-03781-2Scopus ID: 2-s2.0-85101808759OAI: oai:DiVA.org:ri-52900DiVA, id: diva2:1546825
Note

Funding details: Wallenberg Wood Science Center, WWSC; Funding details: Knut och Alice Wallenbergs Stiftelse; Funding text 1: The authors gratefully acknowledge the STFI's Intressentförening for financial support. The Knut and Alice Wallenberg Foundation, the WWSC Program and the Wood and Pulping Chemistry Research Network (WPCRN) at KTH are gratefully acknowledged for financial support for Dr. Sevastyanova. The authors would also like to acknowledge Dr. Anthony Bristow for the linguistic revision.

Available from: 2021-04-23 Created: 2021-04-23 Last updated: 2022-05-10Bibliographically approved

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Esteves, ClaudiaBrännvall, Elisabet

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