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Low-consistency refining of mechanical pulp in the light of forces on fibres
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering. (FSCN)
Braviken Paper Mill, Holmen Paper, SE-60188 Norrkoping, Sweden.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering. (FSCN)ORCID iD: 0000-0003-3381-5516
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering. (FSCN)
2015 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 30, no 2, 225-229 p.Article in journal (Refereed) Published
Abstract [en]

The aim of this investigation was to find new approaches to evaluate the performance of low-consistency refiners. Data from a paper mill producing TMP from Norway spruce was used in order to find a possible way to calculate the power split between the zones in a TwinFlo refiner. An assumption of equal amount of fibres captured between overlapping bars was found successful in order to develop equations for the power split. The equations predicted equal power in both zones at equal disc gaps. The power was found to increase approximately linearly with decreasing disc gap over the range, 0.1-0.2 mm. The power split was essential to know for calculating refining intensities expressed as specific edge load and forces on fibres in the two zones. The reduction in fibre length was about 5% at 0.17 mm disc gap or at 0.03 N forces on fibres or at 0.7 J/m specific edge load. Disc gap, forces on fibres and specific edge load was found to predict fibre shortening approximately equally upon changes in power and flow rate through the refiner.

Place, publisher, year, edition, pages
2015. Vol. 30, no 2, 225-229 p.
Keyword [en]
Low consistency, Two-zoned refiners, Fibre length, Refining intensity, Disc gap, Specific edge load, Forces on fibres, Thermomechanical pulping
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-25656DOI: 10.3183/NPPRJ-2015-30-02-p225-229ISI: 000354806700006Scopus ID: 2-s2.0-84951952932OAI: oai:DiVA.org:miun-25656DiVA: diva2:849389
Available from: 2015-08-28 Created: 2015-08-18 Last updated: 2017-08-10Bibliographically approved

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Berg, Jan-ErikSandberg, ChristerEngberg, Birgitta A.Engstrand, Per
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Citation style
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