PAPER making! g! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL ® Volume 11, Number 2, 2025
achieving long-term sustainable development depends on addressing issues like raw material scarcity, wastewater treatment, and energy consumption. Biotechnology represents a technological breakthrough in the industry, particularly evident in processes such as biological pulping and wastewater treatment, where enzymes like cellulases, hemicellulases, and ligninolytic enzymes play crucial roles. This chapter introduces processes such as biological pulping, bleaching, and deinking, focusing on different types of enzymes, their catalytic mechanisms, and their applications in the pulp and papermaking sector. Furthermore, the chapter addresses the obstacles present in the current pulp and papermaking processes and proposes solutions to overcome these challenges, thereby paving the way for a greener and more efficient industrial development. RECYCLING “Effect of PCL Nanocomposite Coatings on the Recyclability of Paperboard Packaging”, Marina Vukoje & Josip Bota, Recycling 2025, 10(2), 53. When it comes to the disposal of paperboard and cardboard packaging waste to reduce their environmental impact, recycling is one of the most desirable options. With innovations and development of biopolymer coatings and their application in packaging materials, new paper-based packaging solutions are expected on the market. Besides evaluating their mechanical and barrier properties, it is essential to assess their environmental impact. Therefore, this study investigated the impact of biodegradable polycaprolactone (PCL) polymer coating, as well as PCL modified with SiO 2 , Al 2 O 3 , and ZnO nanoparticles, on the recycling behavior of paperboard. The coating samples were prepared by dissolving PCL polymer in ethyl acetate and nanoparticle dispersion. Paperboard (230 g/m 2 ) was printed by offset printing process and then coated with PCL and PCL nanocomposite coatings. Recycling was performed under controlled laboratory conditions following a standardized method. Deinkability was assessed by evaluating the optical properties and using an image analysis system. From the obtained results, it can be concluded that the use of PCL coatings and PCL coating modified with SiO 2 , Al 2 O 3 , and ZnO nanoparticles do not significantly impact the optical properties of the recycled pulp, thereby not restricting the implementation in paperboard production and waste management. TISSUE “Easy-to-use numerical models of water removal in vacuum dewatering and molding during through air drying of tissue paper”, Björn Sjöstrand, Drying Technology: An International Journal , Volume 43(4), 2025. Most manufacturing processes for materials from cellulose-based materials deal with huge amounts of water, the interactions of water within the raw material (cellulose) both enable exciting properties as well as limit the rates of production. In the production of tissue paper materials, water content in the pulp is as high as 99.8% when fed into the paper machine, and almost all this water must be removed efficiently and fast. This work presents Novel, easy-to-use, numerical models for predictions of the dewatering of tissue in high vacuum suction boxes and through air drying (TAD) molding. The numerical models were based on and compared with previously published experimental results of vacuum dewatering from laboratory equipment and validated against four separate pilot paper machine trials. The purpose of this study was to establish an accurate, easy-to-use numerical model varying fiber- and machine parameters used in tissue manufacturing to enable the evaluation of new materials and dewatering strategies for energy efficiency investigations. The results indicate that the developed dewatering model could predict the dewatering behavior for both conventional vacuum dewatering and TAD molding using the same set of fitting parameters. The method of developing the numerical models presented can be used for machine optimization and energy efficiency improvements of vacuum dewatering elements in papermaking processes in general.
Technical Abstracts
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