PAPERmaking! FROM THE PUBLISHERS OF PAPER TECHNOLOGY Volume 7, Number 1, 2021
analytical – numerical approach proposed in the article. To the best knowledge of the authors, the influence of the perforations has never been considered before in the analytical or analytical – numerical approach for estimation of the compressive strength of boxes made of corrugated paperboard. The novelty of this paper is to adopt the method presented to include perforation influence on the box compressive strength estimation “ Vibration levels of stacked parcel packages in laboratory test environment. Over- tested or under-tested? ”, Zsófia Németh, Bence Molnár, Csaba Pánczél & Péter Böröcz, OPEN ACCESS, DOI: https://doi.org/10.14513/actatechjaur.00603 . Courier express parcel (CEP) shipments become one of the most important delivery methods in the Business-to-Consumer sales model. This paper observed and analyzed the vertical vibration levels that occur in stacked and unsecured parcels during express delivery versus the simulation in the laboratory. At the end, a detailed comparison is reported between the field and laboratory vibration levels (based on standard PSD test profile) in the frequency range of 1 – 200 Hz. For the measurement a three-layer stacked unit was used building from corrugated box samples. The result shows and analyzes the vibration levels in the stacked layers in comparison to the ISTA (International Safe Transport Association) vibration protocol where only a single parcel is required to be tested without any stacking configuration. TISSUE “ Energy system optimization model for tissue papermaking process ”, Yang Zhang, Mengna Hong, Jigeng Li, Jingzheng Ren & Yi Man, Computers & Chemical Engineering , 146, March 2021, 107220. The drying process accounts for the largest proportion of energy consumption in paper mills. Energy system optimization has a great significance for reducing the energy consumption of the paper drying process. The drying process is a complex system that consists of several subsystems, such as cylinder and air hood systems. Previous optimization models for energy systems usually focused on these subsystems. A global optimization methodology for the entire drying process is lacking, and no existing models can be applied in practice. In this work, an energy system optimization model for the tissue paper drying process is proposed based on a process simulation model. The modeling process integrates the various subsystems and fully considers the coupling of the paper drying process, which greatly enhances the industrial application value of the model. Industrial operating data are used to test the simulation model, and the results show that the simulation error of each key variable is within 5%, which meets the real-world production requirements and lays the foundation for an energy efficiency analysis of each subsystem. Applying the optimization model to a tissue paper mill, the results show that it can reduce drying costs by 8.71%. “ Optimizing the brightness and mechanical strength of tissue paper made of deinked pulp using isolated soy protein and chitosan by using response surface methodology ”, Seyed Sajad Sazmand, Yahya Hamzeh, Sahab Hedjazi & Hamid Reza Rudi, Journal of Forest and Wood Product , 73(4), 491-502. The lower mechanical properties of paper made from recycled fiber is due to their inherent properties of the used fibers. In order to improve strengths, various polymers such as cationic polymer are used, while today the global trend is the utilization of natural and renewable materials. In this study, two biopolymers including chitosan (Ch), isolated soy protein (ISP) along with glutaraldehyde (GA) were used to optimize the mechanical properties of the tissue paper made from the de-inked fibers. For this purpose, at the first chitosan solution with loading level of 0% to 2%, then glutaraldehyde with loading level of 2% to 6%, and finally isolated soy protein with 1% to 3% levels were added to the pulp suspension. The properties of
Technical Abstracts
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