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Method for the quantification of in-plane drying nonuniformity
RISE, Innventia.ORCID iD: 0000-0001-9342-2269
RISE, Innventia.
2015 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 30, no 2, p. 286-295Article in journal (Refereed) Published
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Abstract [en]

A method has been developed in order to determine the in-plane non-uniformity of drying of wet paper samples dried by an air flow. The surface temperature of the samples, recorded by an infrared camera, is used to determine a mean drying time and the local drying time of each pixel. Based on the initial dryness and the mean drying time, a mean drying rate can be obtained, and furthermore, the drying time of each pixel can be presented as a 2-dimensional map. Apart from conventional statistical information on the variation in drying time, the map also gives information regarding the size and shape of the drying non-uniformity. The pressure drop over the sample and the air flow rate through the sample were used to calculate a flow resistance as a function of grammage. Laboratory sheets with grammages between 15 and 45 g/m2, made from an unrefined bleached chemical hardwood pulp, were analysed. A considerable variation in local drying time was observed, despite their anticipated uniform formation. The mean drying time increased linearly with increasing grammages, thus the mean drying rate was not dependent on grammage. The flow resistance of the sheets increased with increasing grammage. The air flow rate through the sheet appeared not to be critical for the drying rate at the given experimental conditions.

Place, publisher, year, edition, pages
2015. Vol. 30, no 2, p. 286-295
Keywords [en]
Dewatering, Drying, Moisture, Nonuniformity, TAD, Thermography, Tissue
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-770DOI: 10.3183/npprj-2015-30-02-p286-295Scopus ID: 2-s2.0-84951749476OAI: oai:DiVA.org:ri-770DiVA, id: diva2:1039579
Available from: 2016-10-24 Created: 2016-08-03 Last updated: 2019-07-05Bibliographically approved

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CiteExportLink to record
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  • apa
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  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
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