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Through air drying: The influence of formation and pulp type on non-uniform drying and air flow
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences. (VIPP)
2014 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The removal of water is an integral part of tissue paper production. Through air drying (TAD) is used for water removal when producing premium tissue grade products, however, at the price of higher energy demand. A better understanding of TAD may therefore lower the energy demand.

The objective was to investigate the influence of formation, pulp type and grammage on non-uniform drying and air flow through sheets. A laboratory method, based on infrared thermography, was used to determine drying time and area-specific and mass-specific drying rates. Air flow rate and pressure drop were used to determine flow resistance and modified permeability.

Pulp type had a large influence on the air flow through the sheet. Modified permeability, i.e. the material property describing the air flow through the fibre network, was strongly dependent on grammage for lower grammages, while it approached a constant value for higher grammages. In contrast to that, mass-specific drying rates were similar for the different pulp types at lower grammages, but proved to be grammage-dependent for higher grammages. Formation did not influence the drying speed to any large extent.

The results illustrate that industrial TAD processes operate under very special process conditions due to the low grammage sheets.

Place, publisher, year, edition, pages
Karlstad: Karlstads universitet, 2014. , p. 36
Series
Karlstad University Studies, ISSN 1403-8099 ; 2014:49
Keyword [en]
Drying, Dewatering, Water removal, Moisture, Non-uniformity, Variability, Tissue, TAD, Through air drying, Thermography, Formation, Pulp
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-33515ISBN: 978-91-7063-585-4 (print)OAI: oai:DiVA.org:kau-33515DiVA: diva2:742455
Presentation
2014-09-30, Nyquistsalen 9C203, Karlstads universitet, Karlstad, 10:15 (Swedish)
Opponent
Supervisors
Available from: 2014-09-09 Created: 2014-09-01 Last updated: 2015-12-28Bibliographically approved
List of papers
1. Method for the quantification of in-plane drying non-uniformity
Open this publication in new window or tab >>Method for the quantification of in-plane drying non-uniformity
2015 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 30, no 2, p. 286-295Article in journal (Other academic) Published
Place, publisher, year, edition, pages
Mid Sweden University, 2015
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-33602 (URN)10.3183/NPPRJ-2015-30-02-p286-295 (DOI)
Available from: 2014-09-09 Created: 2014-09-09 Last updated: 2017-07-04Bibliographically approved
2. The influence of formation on air flow through a non-uniform drying of low grammage sheets
Open this publication in new window or tab >>The influence of formation on air flow through a non-uniform drying of low grammage sheets
2014 (English)Report (Other academic)
Publisher
p. 21
Series
Innventia Report ; 546
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-33603 (URN)
Available from: 2014-09-09 Created: 2014-09-09 Last updated: 2014-09-09Bibliographically approved
3. The influence of pulp type on through air drying
Open this publication in new window or tab >>The influence of pulp type on through air drying
2014 (English)Report (Other academic)
Series
Innventia Report ; 548
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-33604 (URN)
Available from: 2014-09-09 Created: 2014-09-09 Last updated: 2014-09-09Bibliographically approved

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