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The influence of through-thickness variation on the mechanics of paper drying
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).ORCID iD: 0000-0001-8699-7910
2005 (English)In: ADVANCES IN PAPER SCIENCE AND TECHNOLOGY: TRANSACTIONS OF THE 13TH FUNDAMENTAL RESEARCH SYMPOSIUM, VOLS 1-3 / [ed] IAnson SJ, 2005, 213-240 p.Conference paper, Published paper (Refereed)
Abstract [en]

A material model for drying paper is presented. Moisture-dependent material parameters, hygroscopic shrinkage, the elastic and the time-dependent responses of the material to load, and the effect of unloading at a higher stiffness than the load was applied at are modelled. The model is used to determine the effects of a varying moisture ratio through the paper during drying on free shrinkage development and stiffness development at free drying. Simulation results for the stress development during drying and the state of residual stress immediately after drying are also presented. The model predicts a variation of in-plane elastic moduli through the paper, a prediction that is studied by experiments.

Place, publisher, year, edition, pages
2005. 213-240 p.
Keyword [en]
RESIDUAL-STRESS BUILDUP
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:kth:diva-8191ISI: 000283529400009ISBN: 978-0-9545272-3-5 (print)OAI: oai:DiVA.org:kth-8191DiVA: diva2:13446
Conference
13th Fundamental Research Symposium on Advances in Paper Science and Technology, Univ Cambridge, Cambridge, ENGLAND, SEP, 2005
Note
QC 20110201Available from: 2005-11-02 Created: 2005-11-02 Last updated: 2011-02-01Bibliographically 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.
Series
Trita-HFL. Report / Royal Institute of Technology, Solid mechanics, ISSN 1654-1472 ; 0393
Keyword
paper, drying, mechanical properties, residual stress, curl
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-469 (URN)
Public defence
2005-11-18, F3, Lindstedtsvägen 26, 10:00
Opponent
Supervisors
Available from: 2005-11-02 Created: 2005-11-02 Last updated: 2013-01-14Bibliographically approved

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Östlund, Sören

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