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Energy efficient high quality CTMP for paperboard
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
Holmen Paper Development Centre, Braviken Paper Mill, SE-601 88 Norrköping, Sweden.
2007 (English)In: International Mechanical Pulping Conference 2007, TAPPI, 2007, Vol. 1, p. 370-380Conference paper, Published paper (Refereed)
Abstract [en]

This paper discusses the relationship between bulk and internal bond strength in paper sheets and their dependency on fibre length, fibre flexibility and fibre surface properties. It also discusses an interesting process concept for manufacturing of energy efficient high quality CTMP for paperboard. Post-refining pilot trials of spruce HTCTMP with an initial freeness of 740 ml were carried out at Metso Paper R&D in Sundsvall, Sweden. Both gentle high consistency and severe low consistency post-refining were performed. High consistency post-refining, at high energy input, gave freeness levels below 70 ml and still preserved the fibre length. These fibres were characterised by a very high flexibility giving sheets with a tensile index as high as 64 kNm/kg. Long fibres can however cause formation problems on a board machine which in turn can lead to poor surface properties, hence shorter fibres are from that perspective desirable. The low consistency post-refining resulted in a rapid drop in freeness due to fibre cutting. This was achieved at an extremely low specific energy input, which probably preserved most of the original fibre stiffness. In spite of this low energy input it was possible to reach the same Z-strength at a given bulk, as for the high consistency post-refined pulp. This implied that high bulk at certain internal bond strength could be,...;. achieved with stiff fibres even though the content of long fibres was low. Energy efficient low consistency postrefining of spruce HTCTMP yields high quality pulp at a total energy input of ∼800 kWh/admt and is an-interesting process concept for production of pulps intended for paperboard.

Place, publisher, year, edition, pages
2007. Vol. 1, p. 370-380
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:miun:diva-28900Scopus ID: 2-s2.0-55849111841ISBN: 978-160560293-6 (print)OAI: oai:DiVA.org:miun-28900DiVA, id: diva2:974068
Conference
International Mechanical Pulping Conference 2007, TAPPI; Minneapolis, MN; United States; 6 May 2007 through 9 May 2007; Code 73991
Available from: 2016-09-23 Created: 2016-09-23 Last updated: 2016-09-23Bibliographically approved

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Klinga, NiklasHöglund, Hans

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  • apa
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