PAPERmaking! FROM THE PUBLISHERS OF PAPER TECHNOLOGY Volume 6, Number 2, 2020
comparison with low Ǧ stiffness pallets. The fact that boxes were weaker on low Ǧ stiffness pallets could be explained by the uneven pressure distribution between the pallet deck and bottom layer of boxes. Pressure data showed that a higher percentage of total pressure was located under the box sidewalls that were supported on the outside stringers of low Ǧ stiffness pallets in comparison with high Ǧ stiffness pallets. This was disproportionately loading one side of the box. Utilizing the effects of pallet top deck stiffness on box compression performance, a unit load cost analysis is presented showing that a stiffer pallet can be used to carry boxes with less board material; hence, it can reduce the total unit load packaging cost. Effect of Corrugated Board Structure on Mechanical Properties, Włodzimierz Szewczyk & Maria Bieńkowska, Wood Research , 65(4), 2020, doi:/10.37763/wr.1336- 4561/65.4.653662 . The article shows the method for prediction of corrugated board properties based on automatic generation of a database containing material compositions of all the boards possible to be produced by a given manufacturer. With their large number it is not possible to carry out on the basis of measurements made on earlier manufactured products. As a result of the tests carried out with the use of data provided by the corrugated board manufacturer, it was found that using his paper materials and machinery it was possible to more than double increase the bending stiffness and edge crush resistance indexes of produced board. In some cases, the options for improving the indexes are slightly smaller, e.g. bending stiffness in the cross direction of three-layer board with flute C, the mentioned manufacturer can increase by approx. 40% of the maximum value obtained so far. PAPERMAKING Using Digital Image Processing to Characterize Flocculation of Papermaking Wastewater, Ming Li, Kaitang Hu & Jin Wang, Advances in Intelligent Systems and Computing book series (AISC, volume 1130), https://doi.org/10.1007/978-3-030- 39442-4_56. Wastewater generated from pulp and paper mills is a major pollution source. It is important to identity the flocculation characteristics of papermaking wastewater so that the wastewater treatment can be optimized. In this paper the characteristics of flocculation of deinking wastewater were studied by computer image processing. Experiments were carried out to acquire images of flocculation. A series of graph parameters related to floc sedimentation characteristics and time-variable parameters were found. Using computer visualization technology to study the static and dynamic behavior of wastewater flocs has many advantages; computer visualization technology can be used to improve wastewater treatment. Penetration control of surface sizing starch using cationic PAM and its effect on the bending stiffness of paper, Seo, M., Youn, H., and Lee, H., BioResources, 15(3), DOI: 10.15376/biores.15.3.5489-5502. Surface sizing is employed to increase the wetting resistance against liquids and to improve strength and surface properties of paper. Starch solution is the most widely used for surface sizing, and its effect is highly dependent upon how deep the starch solution penetrates into the paper structure. Better tensile strength can be obtained when starch penetrates deep into the thickness direction of paper. However, holdout of starch solution is beneficial for improving the stiffness and air or liquid resistance. This study was focused on the use of cationic polyacrylamide (PAM) as a surface sizing additive to control the penetration of starch solutions into paper, thus improving bending stiffness of paper. The effects of the ionic property, viscosity, and charge density of PAM on starch penetration and bending stiffness of surface sized papers were investigated. The penetration of starch solution was investigated with confocal laser
Technical Abstracts
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