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Optimizing shear strength profiles in paperboard for better crease formation
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.). KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center BiMaC Innovation. Innventia AB, Sweden .
2014 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, Vol. 29, no 3, 510-520 p.Article in journal (Refereed) Published
Abstract [en]

The tensile properties and shear strength profiles have been evaluated for three paperboards having different through thickness profiles. Paperboard with a 1) strong middle ply and a weak bottom interface, 2) weak middle ply and top interface and 3) weak top and bottom interfaces. The creasing and folding performances at different crease depths were evaluated, and it was concluded that it is preferable to have a weak bottom interface to form a well-defined crease that bulged out and formed a well-shaped crease. Package formation of a cigarette package was evaluated as the ability to use multiple creases to form round corners. In addition, the in-plane crack tendency on the outside of the crease, and the forming of a smooth crease line on the inside of the crease were studied. The ability to form rounded corners coincided well with the formation of well-shaped crease lines. Creases with a weak bottom interface did also generate good looking rounded corners. If also the top interface was weak, in-plane cracks on the outside of the crease could be prevented. A well-shaped crease also resulted in a straight and well defined crease line on the inside of a folded corner. Finally, the evaluation of shear strength profiles was a good tool to confirm process changes that were made to make paperboards with different through thickness profiles.

Place, publisher, year, edition, pages
2014. Vol. 29, no 3, 510-520 p.
Keyword [en]
Shear strength, Round corner cigarette package, Paperboard, converting, Creasing, Folding, Mechanical properties
National Category
Paper, Pulp and Fiber Technology
URN: urn:nbn:se:kth:diva-155817DOI: 10.3183/NPPRJ-2014-29-03-p510-520ISI: 000342682700016ScopusID: 2-s2.0-84907623669OAI: diva2:762955

QC 20141113

Available from: 2014-11-13 Created: 2014-11-13 Last updated: 2014-11-13Bibliographically approved

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Nygårds, Mikael
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Solid Mechanics (Dept.)VinnExcellence Center BiMaC Innovation
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