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Low-consistency refining of CTMP targeting high strength and bulk: effect of filling pattern and trial scale
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering. (High Yield Pulping)
BillerudKorsnäs.
Valmet.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.ORCID iD: 0000-0003-1881-6473
2021 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 36, no 1, p. 33-41, article id 61Article in journal (Refereed) Published
Abstract [en]

Chemithermomechanical pulp (CTMP) is often used in central layers of multiply paperboards due to its high bulk and strength. Such a CTMP should consist of well-separated undamaged fibres with sufficient bonding capacity. The basic objective of this work is to optimize process conditions in low-consistency (LC) refining, i. e. to select or ultimately develop new optimal LC refiner filling patterns, in order to produce fibrillar fines and improve the separation of fibres from each other while preserving the natural fibre morphology as much as possible. Furthermore, the aim is to evaluate if this type of work can be done at laboratory-scale or if it is necessary to run trials in pilot- or mill-scale in order to get relevant answers. First stage CTMP made from Norway spruce (Picea abies) was LC refined in mill-, pilot- and laboratory-scale trials and with different filling patterns. The results show that an LR1 laboratory refiner can favourably be used instead of larger refiners in order to characterize CTMP with regard to tensile index and z-strength versus bulk. A fine filling pattern resulted in CTMP with higher tensile index, z-strength and energy efficiency at maintained bulk compared to a standard filling pattern.

Place, publisher, year, edition, pages
De Gruyter Open, 2021. Vol. 36, no 1, p. 33-41, article id 61
Keywords [en]
bulk, filling patterns, low consistency refining, mechanical pulping, pulp strengths.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:miun:diva-40700DOI: 10.1515/npprj-2020-0061ISI: 000625867700003Scopus ID: 2-s2.0-85097630922OAI: oai:DiVA.org:miun-40700DiVA, id: diva2:1507546
Funder
Knowledge Foundation, 20150373Available from: 2020-12-08 Created: 2020-12-08 Last updated: 2021-04-01Bibliographically approved

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Berg, Jan-ErikEngstrand, Per

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