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Refining gentleness - a key to bulky CTMP
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering. (FSCN)
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering. (FSCN)
Billerud Korsnäs AB, SE-80181 Gävle, Sweden..
Billerud Korsnäs AB, SE-71880 Frövi, Sweden..
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2022 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 37, no 2, p. 349-355Article in journal (Refereed) Published
Abstract [en]

Chemithermomechanical pulp (CTMP) is often used in middle layers of multiply paperboards due to its high bulk at specified strength. Such a CTMP should consist of well-separated undamaged fibres with sufficient bonding capacity. The basic objective of this work is to examine the effect of refining on bulk, taking into account conditions such as temperature, sulphonation, refining gap and refiner size. First stage CTMP made from Norway spruce (Picea abies) were produced in pilot and mill scale trials. Two new parameters, Equivalent temperature related to softness and Refining gentleness are introduced that take into account refining conditions as actual temperature, softening temperature, bound sulphonate content, refining gap and refiner diameter. The results show that bulk increases linearly with refining gentleness.

Place, publisher, year, edition, pages
2022. Vol. 37, no 2, p. 349-355
Keywords [en]
bulk, mechanical pulping, refining gap, sulphonation, temperature
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:miun:diva-44292DOI: 10.1515/npprj-2021-0060ISI: 000747994500001Scopus ID: 2-s2.0-85124230145OAI: oai:DiVA.org:miun-44292DiVA, id: diva2:1636941
Available from: 2022-02-11 Created: 2022-02-11 Last updated: 2022-06-01Bibliographically approved

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Berg, Jan-ErikPersson, ErikEngstrand, Per

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