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Effect of machine speed on formation and strength efficiency in twin-wire roll forming of never-dried unbleached softwood kraft pulp
SCA, Sweden.
RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
2018 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 33, no 2, p. 271-278Article in journal (Refereed) Published
Abstract [en]

There is a constant drive to increase machine speed in the production of kraftliner and most other major paper grades, but the separate effect of the machine speed on the paper properties has been unclear. The effect of machine speed in twin-wire roll forming of never-dried unbleached softwood kraft pulp was evaluated here in a pilot machine investigation by examining three machine speed levels (500, 750, and 1000 m/min) over a series of jet-to-wire speed differences. Similar headbox consistency and draw from wire section to winding were employed at the different machine speed levels. An increase in the machine speed had a favorable effect on formation and Z-strength efficiency over a wide range of jet-to-wire speed differences, whereas the machine speed had an insignificant effect on tensile strength efficiency and tensile stiffness efficiency. For all properties, the overall shape of the jet-to-wire speed difference curve remained similar when changing the machine speed.

Place, publisher, year, edition, pages
2018. Vol. 33, no 2, p. 271-278
Keywords [en]
formation, forming sections, jet to wire speed difference, kraft pulps, machine speed, softwood pulps, stiffness, tensile properties, tensile strength, twin wire machines, Z direction strength, Efficiency, Kraft pulp, Softwoods, Speed, Unbleached pulp, Wire, Forming section, Wire machines, Wire speed, Z-directions, Machine windings, Fourdrinier Wires, Velocity
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-34286DOI: 10.1515/npprj-2018-3038Scopus ID: 2-s2.0-85050159285OAI: oai:DiVA.org:ri-34286DiVA, id: diva2:1235971
Available from: 2018-07-30 Created: 2018-07-30 Last updated: 2018-08-06Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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  • vancouver
  • Other style
More styles
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  • de-DE
  • en-GB
  • en-US
  • fi-FI
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  • nn-NB
  • sv-SE
  • Other locale
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Output format
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