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Plastic Replacements Create New Opportunities, Paper360º September/October 2021
Plastic Replacements Create New Opportunities, Paper360º September/October 2021
Journal articles
Magazine articles
On increasing wet-web strength with adhesive polymers, TAPPI JOURNAL February 2020
ABSTRACT: Fiber-fiber adhesion, called “bonding” in the old paper physics literature, is a critical component of the overall strength of dry paper. With freshly formed very wet pulp fiber webs, all evidence suggests there are no fiber-fiber crossings with significant adhesive joint strength. With water removal, a point will be reached where fiber-fiber adhesion starts to contribute to the overall wet-web strength.The literature reveals very few examples of polymers that increase fiber-fiber joint strength in freshly formed webs. Here, we summarize the literature and explain why it is so difficult to promote fiber-fiber wet adhesion with polymers. Nevertheless, ongoing research in areas as diverse as tissue engineering scaffolds and biomimetic adhesives gives clues to future developments. Advances in paper machine engineering have lessened the importance of wet-web strength. By contrast, a critical issue in many of the evolving nanocellulose technologies is the strength of objects first formed by aqueous processing, the green strength—the strength of wet bodies before drying. For exam-ple, 3-D printed nanocellulose objects and ultralow density cellulosic aerogels can be destroyed by capillary forces during drying. There is a need for adhesives that strengthen freshly formed, wet lignocellulosic joints.
Journal articles
Magazine articles
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
Over the Wire, Paper360º January/February 2020
Over the Wire, 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
Journal articles
Magazine articles
Use of Ozone for Cooling Towers. Paper360º July/August 2020
Use of Ozone for Cooling Towers. Paper360º July/August 2020
Journal articles
Magazine articles
We’ve Got Good Chemistry: Innovations Papermakers Need to Know About, Paper360º March/April 2020
We’ve Got Good Chemistry: Innovations Papermakers Need to Know About, Paper360º March/April 2020
Journal articles
Magazine articles
RISI’s European CEO of the Year: Ksenia Sosnina, Ilim Group, Paper360º March/April 2020
RISI’s European CEO of the Year: Ksenia Sosnina, Ilim Group, Paper360º March/April 2020
Journal articles
Magazine articles
BIGGER, BETTER, BOLDER: BillerudKorsnäs Gruvön Surges Forward With Sustainable Paperboard, Paper360º March/April 2020
BIGGER, BETTER, BOLDER: BillerudKorsnäs Gruvön Surges Forward With Sustainable Paperboard, Paper360º March/April 2020