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The effects of high alkali impregnation and oxygen delignification of softwood kraft pulps on the yield and mechanical properties
RISE Research Institutes of Sweden, Bioeconomy and Health, Pulp, Paper and Packaging.ORCID iD: 0000-0002-0816-0047
RISE Research Institutes of Sweden.ORCID iD: 0000-0002-8992-3623
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
2022 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 37, no 2, p. 223-231Article in journal (Refereed) Published
Abstract [en]

This study investigated whether the yield improvement after high alkali impregnation (HAI) is maintained after oxygen delignification and whether the potential of oxygen delignification to increase the mechanical properties is affected by high alkali impregnation. The yield improvement achieved by high alkali impregnation (1 %) was preserved after oxygen delignification, particularly of glucomannan. The total fiber charge and swelling increased after oxygen delignification regardless of the type of impregnation in the cooking step. The tensile index improvement obtained by oxygen delignification was retained if this was preceded by high alkali impregnation. The stiffness index was higher and elongation slightly lower after HAI impregnation than after a standard (REF) impregnation. Fibers obtained through high alkali impregnation seem to be slightly less deformed and slightly wider than fibers obtained after a standard impregnation. 

Place, publisher, year, edition, pages
De Gruyter Open Ltd , 2022. Vol. 37, no 2, p. 223-231
Keywords [en]
curl index, fiber charge, glucomannans, kraft cooking, tensile index, Delignification, Fibers, Kraft pulp, Oxygen, Alkali impregnation, Curl indices, Fibre charge, Glucomannan, Oxygen delignifications, Softwood kraft pulps, Yield Improvement, Impregnation, Tensile Strength
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-59327DOI: 10.1515/npprj-2022-0022Scopus ID: 2-s2.0-85129892544OAI: oai:DiVA.org:ri-59327DiVA, id: diva2:1668597
Available from: 2022-06-13 Created: 2022-06-13 Last updated: 2022-06-13Bibliographically approved

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Esteves, ClaudiaBrännvall, Elisabet

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