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Stiffness and strength properties of five paperboards and their moisture dependency, TAPPI Journal February 2020
ABSTRACT: 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 properties for the preferred level of RH and the mechanical property for the standard climate (50% RH and 23°C).
Journal articles
Magazine articles
Wheat straw as an alternative pulp fiber, TAPPI Journal January 2020
Author: Peter W. Hart | ABSTRACT: The desire to market sustainable packaging materials has led to an interest in the use of various fiber types as a raw material. It has been suggested that the use of annual crops for partial replacement of wood fiber would result in more sustainable products. Several life cycle analyses (LCA) have been performed to evaluate these claims. These LCAs provided conflicting and contradictory results because of the local conditions and the specific pulping processes investigated. Selected LCAs are reviewed and the underlying reasons for these conflicting results are analyzed.
Journal articles
Magazine articles
SetPoint: Powerful Influences, Paper360º January/February 2020
SetPoint: Powerful Influences, Paper360º January/February 2020
Journal articles
Magazine articles
Over the Wire, Paper360º January/February 2020
Over the Wire, Paper360º January/February 2020
Journal articles
Magazine articles
Green Bay Packaging Keeps Safety in the Family, Paper360º January/February 2020
Green Bay Packaging Keeps Safety in the Family, Paper360º January/February 2020
Journal articles
Magazine articles
Heading For a Downturn?, Paper360º January/February 2020
Heading For a Downturn?, Paper360º January/February 2020
Journal articles
Magazine articles
Pulp and Paper Must Play a Part in Mitigating Climate Change, Paper360º January/February 2020
Pulp and Paper Must Play a Part in Mitigating Climate Change, Paper360º January/February 2020
Journal articles
Magazine articles
Employee Selection Can Help Weather the ´Silver Tsunami’, Paper360º January/February 2020
Employee Selection Can Help Weather the ´Silver Tsunami’, Paper360º January/February 2020
Journal articles
Magazine articles
Solenis Growth Addresses Industry Trends, Paper360º January/February 2020
Solenis Growth Addresses Industry Trends, Paper360º January/February 2020
Journal articles
Magazine articles
Chemicals Play Key Role in Food Packaging, Paper360º January/February 2020
Chemicals Play Key Role in Food Packaging, Paper360º January/February 2020