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Modeling the influence of drying conditions on the stress buildup during drying of paperboard
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).
2006 (English)In: Journal of engineering materials and technology, ISSN 0094-4289, Vol. 128, no 4, 495-502 p.Article in journal (Refereed) Published
Abstract [en]

This paper concerns the drying process in the manufacturing of paperboard. Of particular interest are the effects of through-thickness property variation in paperboard during drying. In addition, resulting average properties from different drying histories are discussed. A mathematical model of the drying process is presented. It allows the moisture and temperature histories, the stress and strain histories, and the buildup of mechanical properties to be simulated. The temperature of the heating medium, the humidity and pressure of the ambient air, and either applied loads or prescribed strains are required input data. For symmetric convective drying, the ambient temperature, the humidity, and the thickness of the board were varied. For drying on a heated plate, the temperature of the plate and the thickness of the board were varied. Results regarding the moisture history, the stiffness development, and the buildup of residual stresses are presented and compared to literature experimental data. Also, sheets with a varying fiber base through the thickness, which affects both the moisture history and the influence of moisture on shrinkage, were studied. The model was shown to yield predictions qualitatively inline with empirical knowledge.

Place, publisher, year, edition, pages
2006. Vol. 128, no 4, 495-502 p.
Keyword [en]
Curl, Drying, Moisture gradient, Paperboard, Residual stress
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-8192DOI: 10.1115/1.2345440ISI: 000241820400005ScopusID: 2-s2.0-33751434870OAI: diva2:13447
QC 20110831. Conference: Symposium on Time-Dependent Behaviors of Polymers and Polymer Matrix Composites. Orlando, FL.Available from: 2005-11-02 Created: 2005-11-02 Last updated: 2011-09-27Bibliographically approved
In thesis
1. Residual stresses in paperboard and the influence of drying conditions
Open this publication in new window or tab >>Residual stresses in paperboard and the influence of drying conditions
2005 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The drying sequence in the manufacturing process for paperboard involves evaporation of water, primarily from within the fibres. The vapour is then transported out of the web by pressure or concentration gradients. As the moisture transport from the paper web to the ambient is quicker than the moisture transport within the fibre network to the surfaces of the web, moisture gradients develop through the thickness of the web. This work concerns effects on the mechanics of paper drying from the variation in moisture through the relatively thin structures of paper and paperboard.

Distributions of inplane residual stresses through paper materials in the unloaded state after drying are believed to be caused by the varying moisture through the thickness during drying. The distributions in general exhibit compressive stress near the board surfaces and tensile stress in the interior of the board. This may be modified after drying and is also affected by structural variation in the material between different plies of multi-ply paperboards.

The stress development during drying is important because it influences the resulting material properties of the paper and because it can lead to curl, which is a quality problem. The residual stresses themselves are an error source in simulation or evaluation of the mechanical behaviour of paper.

In this work, residual stress distributions in paperboard were determined experimentally, to clarify the mechanisms of residual stress build-up. An experimental method for such tests was also developed. Based on the experimental findings, the mechanics of paper drying was modelled and the stress build-up simulated. Simulation offers a way of studying how the properties of paper develop during drying of wet paper webs.

Place, publisher, year, edition, pages
Stockholm: Hållfasthetslära, 2005. 21 p.
Trita-HFL. Report / Royal Institute of Technology, Solid mechanics, ISSN 1654-1472 ; 0393
paper, drying, mechanical properties, residual stress, curl
National Category
Mechanical Engineering
urn:nbn:se:kth:diva-469 (URN)
Public defence
2005-11-18, F3, Lindstedtsvägen 26, 10:00
Available from: 2005-11-02 Created: 2005-11-02 Last updated: 2013-01-14Bibliographically approved

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