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Investigations of In-Plane Properties of Paperboard
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).
2013 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

In-plane properties of paperboard have always been of interest to paper mechanical researchers. The reason for this is that they play a large role for the usability of the paperboard throughout its lifespan.  Tensile properties are crucial when the board is fed through printing and converting machines at high speeds in the beginning of its life. While compressive properties are essential in the later use of e.g. packages. In this thesis some methods for evaluating in-plane properties are reinvestigated.

In Paper A the tensile test was investigated with focus on sample size and strain distributions. Three different multiply paperboards were examined with varying sample sizes using speckle photography. Different strain behaviour was found for different sample sizes. This difference was dependent on the length to width ratio of the sample and was caused by the activation of strain zones in the sample. These zones were of a constant size and therefore occupied different amounts of the total sample area.

Paper B investigates the mechanism that causes failure in the short span compression test (SCT). Three different multiply paperboards were examined, this time chosen to have distinctly different through-thickness profiles. The boards were characterized and the data was used to simulate a SCT test with the three different boards. The simulation was conducted with a finite element model consisting of layers of continuum elements with cohesive interfaces in-between. From the model it was concluded that the main mechanism for failure in SCT is delamination that was caused by shear damage. 

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. , 18 p.
Series
Trita-HFL. Report / Royal Institute of Technology, Solid Mechanics, ISSN 1654-1472 ; 0540
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:kth:diva-123158ISBN: 978-91-7501-788-4 (print)OAI: oai:DiVA.org:kth-123158DiVA: diva2:624933
Presentation
2013-06-07, Seminarierummet, Teknikringen 8D, KTH, Stockholm, 13:15 (Swedish)
Opponent
Supervisors
Note

QC 20130603

Available from: 2013-06-03 Created: 2013-06-03 Last updated: 2013-06-03Bibliographically approved
List of papers
1. Investigation of sample-size effects on in-plane tensile testing of paperboard
Open this publication in new window or tab >>Investigation of sample-size effects on in-plane tensile testing of paperboard
2012 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 27, no 2, 295-304 p.Article in journal (Refereed) Published
Abstract [en]

The impact of sample size on in-plane strain behavior in paperboard was investigated, with the aim to explore the differences between local and global properties in paperboard, and try to pinpoint the mechanisms behind such differences. The local properties are of interest in converting as well as for future 3D forming of paperboard. It is important to identify differences in behavior between local and global properties since most paperboards are evaluated against the latter. The methods used for evaluation were tensile tests in controlled environment and speckle photography. The results show that there is a difference in strain behavior that is dependent of the length to width ratio of the sample, that this behavior cannot be predicted by standard tensile tests and that it depends on the board composition. The speckle analysis revealed that the behavior is a result of the activation of strain zones in the sample. These zones are relatively constant in size and therefore contribute differently to total strain in samples of different size.

Keyword
Size dependency, Paperboard, In-plane, Tensile test, Speckle photography
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-104883 (URN)10.3183/NPPRJ-2012-27-02-p295-304 (DOI)000315696000018 ()2-s2.0-84865202355 (Scopus ID)
Note

QC 20121114

Available from: 2012-11-14 Created: 2012-11-14 Last updated: 2017-12-07Bibliographically approved
2. Investigation of shear induced failure during SCT loading of paperboards
Open this publication in new window or tab >>Investigation of shear induced failure during SCT loading of paperboards
2013 (English)Report (Other academic)
Series
Trita-HFL. Report / Royal Institute of Technology, Solid Mechanics, ISSN 1654-1472 ; 539
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-123160 (URN)
Note

QC 20130603

Available from: 2013-06-03 Created: 2013-06-03 Last updated: 2013-06-03Bibliographically approved

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Citation style
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