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Stiffness and strength properties of five paperboards and their moisture dependency
RISE Research Institutes of Sweden, Bioeconomy and Health, Pulp, Paper and Packaging.ORCID iD: 0000-0001-7356-1093
RISE Research Institutes of Sweden.ORCID iD: 0000-0002-9689-5966
KTH Royal Institute of Technology, Sweden.
2020 (English)In: TAPPI Journal, ISSN 0734-1415, Vol. 19, no 2, p. 71-85Article in journal (Refereed) Published
Abstract [en]

Five commercial multiply folding boxboards made on the same paperboard machine have been analyzed. The paperboards were from the same product series but had different grammage (235, 255, 270, 315, 340 g/m2) and different bending stiffness. The paperboards are normally used to make packages, and because the bending stiffness and grammage varies, the performance of the packages will differ. Finite element simulations can be used to predict these differences, but for this to occur, the stiffness and strength properties need to be determined. For efficient determination of the three-dimensional properties in the machine direction (MD), cross direction (CD), and Z direction (ZD), it is proposed that the paperboard should be characterized using in-plane tension, ZD-tension, shear strength profiles, and two-point bending. The proposed setups have been used to determine stiffness and strength properties at different relative humidity (20,% 50%, 70%, and 90% RH), and the mechanical properties have been evaluated as a function of moisture ratio. There was a linear relation between mechanical properties and moisture ratio for each paperboard. When the data was normalized with respect to the standard climate (50% RH) and plotted as a function of moisture ratio, it was shown that the normalized mechanical properties for all paperboards coincided along one single line and could therefore be expressed as a linear function of moisture ratio and two constants. Consequently, it is possible to obtain the mechanical properties of a paperboard by knowing the structural properties for the preferred level of RH and the mechanical property for the standard climate (50% RH and 23°C).

Place, publisher, year, edition, pages
TAPPI Press , 2020. Vol. 19, no 2, p. 71-85
Keywords [en]
Moisture, Paperboards, Dimensional properties, Finite element simulations, Folding boxboards, Machine directions, Paperboard machines, Stiffness and strength properties, Strength profiles, Two-point bending, Stiffness, Machine Direction, Mechanical Properties, Moisture Content
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-44794DOI: 10.32964/TJ19.2.71Scopus ID: 2-s2.0-85083756126OAI: oai:DiVA.org:ri-44794DiVA, id: diva2:1436656
Available from: 2020-06-08 Created: 2020-06-08 Last updated: 2023-11-01Bibliographically approved

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Marin, GustavNygårds, Mikael

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