Stiffness and strength properties of five paperboards and their moisture dependency
| Autor: | Mikael Nygårds, Gustav Marin, Sören Östlund |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Paperboard Grammage Dependency (UML) Moisture Mechanical Engineering General Chemical Engineering Stiffness 02 engineering and technology General Chemistry Folding (DSP implementation) 021001 nanoscience & nanotechnology 01 natural sciences 010608 biotechnology Product (mathematics) visual_art Media Technology medicine visual_art.visual_art_medium General Materials Science medicine.symptom Composite material 0210 nano-technology Mathematics |
| Zdroj: | February 2020. 19:71-85 |
| ISSN: | 0734-1415 |
| Popis: | 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 deter-mined. 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 stiff-ness and strength properties at different relative humidity (20,% 50%, 70%, and 90% RH), and the mechanical proper-ties 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 prop-erties for the preferred level of RH and the mechanical property for the standard climate (50% RH and 23°C). |
| Databáze: | OpenAIRE |
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