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LC Refining Intensity In The Light Of Forces On Fibres
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering. (High yield pulping technology)
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering. Holmen Paper, Braviken Paper Mill, Sweden. (High yield pulping technology)
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering. (High yield pulping technology)ORCID iD: 0000-0003-3381-5516
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering. (High yield pulping technology)
2014 (English)In: International Mechanical Pulping Conference, IMPC 2014, Espoo: Paper Engineers' Association (PI) , 2014Conference paper, Published paper (Refereed)
Abstract [en]

The aim of this investigation was to find new approaches to evaluate the performance of a full sized two-zoned low-consistency refiner i.e. a refiner with two stators and one rotor in between. 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 two zones. 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 correlate approximately linearly with the disc gap. The power split was essential to know for calculating refining intensity 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 corresponding to 0.03 N force on fibres and 0.7 J/m specific edge load. Disc gap, force on fibres and specific edge load was found to predict the fibre shortening with approximately equal sufficiency upon changes in power and flow rate through the refiner.

Place, publisher, year, edition, pages
Espoo: Paper Engineers' Association (PI) , 2014.
Keywords [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-23755Scopus ID: 2-s2.0-84923950752ISBN: 978-000000000-2 (print)OAI: oai:DiVA.org:miun-23755DiVA, id: diva2:771718
Conference
International Mechanical Pulping Conference, IMPC 2014; Helsinki; Finland; 2 June 2014 through 5 June 2014; Code 109275
Projects
Industriinitiativ energieffektiv tillverkning av mekanisk massa
Funder
Knowledge Foundation, 20100281Available from: 2014-12-15 Created: 2014-12-15 Last updated: 2015-08-12Bibliographically approved

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Berg, Jan-ErikSandberg, ChristerEngberg, BirgittaEngstrand, Per

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