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The influence of grammage and pulp type on through air drying
RISE, Innventia.ORCID iD: 0000-0001-9342-2269
RISE, Innventia.
Karlstad University, Sweden.
2015 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 30, no 4, p. 651-659Article in journal (Refereed) Published
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Abstract [en]

The influence of grammage and pulp type on through air drying was studied. The temperature of a sample was measured during the drying process and the observed temperature changes were used to evaluate the drying process. Laboratory sheets with grammages 15-60 g/m2, from two softwood and two hardwood bleached chemical pulps were used. All samples were analysed with respect to formation, flow resistance, modified permeability, mean drying time, non-uniformity of drying time, and area- and mass-specific drying rate. The pulps had different modified permeabilities but showed similar behaviour when analysed as a function of grammage. A constant value was found for higher grammages, while an increase in modified permeability was found at decreasingly low grammages. Almost all pulp and grammage combinations had similar areaspecific drying rates, but the mass-specific drying rates decreased with grammage. However, the samples with lower grammages had mass specific drying rates independent of modified permeability, where samples with increasing grammage showed an increasing dependency. This implies that the drying efficiency at low grammages was not controlled by the volume flow of the drying air. A good correlation was found between energy needed to evaporate water and energy supplied by the drying air as estimated from the surface temperature and air flow measurement. The surface temperature can therefore be used to quantify the drying process.

Place, publisher, year, edition, pages
2015. Vol. 30, no 4, p. 651-659
Keywords [en]
Drying, Moisture, Non-uniformity, Pulp, Tad, Thermography, Tissue
National Category
Paper, Pulp and Fiber Technology
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URN: urn:nbn:se:ri:diva-775DOI: 10.3183/npprj-2015-30-04-p651-659Scopus ID: 2-s2.0-84951755075OAI: oai:DiVA.org:ri-775DiVA, id: diva2:1039578
Available from: 2016-10-24 Created: 2016-08-03 Last updated: 2019-07-09Bibliographically approved

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