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Fibre floc drainage - a possible cause for substantial pressure peaks in low-consistency refiners
RISE, Innventia, PFI – Paper and Fiber Research Institute.
RISE, STFI-Packforsk.
RISE, STFI-Packforsk.
2008 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 23, no 3, 321-326 p.Article in journal (Refereed) Published
Abstract [en]

Is floc drainage a cause for substantial pressure peaks in low-consistency refiners? High-resolution pressure measurements using a sensor mounted in a stator bar have been performed. These show that during the initial stage of a bar crossing, a substantial pressure is sometimes generated, which can reach a level of several MPa. A theoretical model that explains the pressure pulses is presented. The analysis is based on the assumption that a floc of fibres is trapped between the leading edges of the approaching bar surfaces. Water needs to be expelled from the part of the floc that is compressed and enters into the refiner gap. The hydrodynamic resistance to expel the liquid from within the floc is shown to give rise to substantial pressures in the region close to the leading edge of the rotor bar. The estimated pressures are of the same order as the measured values.

Place, publisher, year, edition, pages
2008. Vol. 23, no 3, 321-326 p.
Keyword [en]
Disc refiner, Drainage resistance, Fibre-optic pressure sensor, Low-consistency, Refining zone
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-29681ScopusID: 2-s2.0-53949112249OAI: oai:DiVA.org:ri-29681DiVA: diva2:1098478
Note

cited By 6

Available from: 2017-05-24 Created: 2017-05-24 Last updated: 2017-05-24Bibliographically approved

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