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Production of fines from refined kraft pulp by fractionation with micro-perforated screens
RISE Research Institutes of Sweden, Bioeconomy and Health, Pulp, Paper and Packaging. Mid Sweden University, Sweden.ORCID iD: 0000-0003-0385-6202
Holmen, Sweden.
Mid Sweden University, Sweden.
2021 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 36, no 3, p. 456-Article in journal (Refereed) Published
Abstract [en]

The objective in this work was to obtain a fine fraction of kraft pulp, with as high concentration as possible, in a pilot-scale fractionation with micro-perforated screen baskets. The influence of screen basket surface, hole size, feed concentration, pulp type and refining segment design was investigated. The results showed that a smooth screen basket surface improved the fractionation efficiency of the unrefined pulp compared to a profiled screen basket, despite a larger hole size. A significantly higher fine fraction concentration was obtained when using refined hardwood pulp compared to when using softwood pulp, which was explained with its lower average fibre length and narrower and thus more flexible fibre fragments. The pilot trials also showed that the screening process could be operated at feed concentrations similar to those directly after a refiner, 30-40 g/l. This was demonstrated in a process layout with partial recirculation where a refiner and a micro-perforated screen basket were operated in series in pilot scale. 

Place, publisher, year, edition, pages
De Gruyter Open Ltd , 2021. Vol. 36, no 3, p. 456-
Keywords [en]
chemical pulp, fines, fractionation, refining, screening, Kraft pulp, Feed concentration, Fractionation efficiency, Process layout, Recirculations, Screen baskets, Screening process, Segment design, Softwood Pulps, Pulp refining
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-53024DOI: 10.1515/npprj-2020-0096Scopus ID: 2-s2.0-85104599996OAI: oai:DiVA.org:ri-53024DiVA, id: diva2:1557364
Available from: 2021-05-25 Created: 2021-05-25 Last updated: 2023-05-16Bibliographically approved

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Björk, Elisabeth

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