PAPER making! g! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL ® Volume 9, Number 1, 2023
COATING “ Electrostatically Complexed Natural Polysaccharides as Aqueous Barrier Coatings for Sustainable and Recyclable Fiber-Based Packaging “, Kai Chi et al, Applied Materials & Interfaces , online, 2023. Driven by the ever-growing awareness of sustainability and circular economy, renewable, biodegradable, and recyclable fiber-based packaging materials are emerging as alternatives to fossil-derived, nonbiodegradable single-use plastics for the packaging industry. However, without functional barrier coatings, the water/moisture vulnerability and high permeability of fiber-based packaging significantly restrain its broader application as primary packaging for food, beverages, and drugs. Herein, we develop waterborne complex dispersion barrier coatings consisting of natural, biodegradable polysaccharides (i.e., chitosan and carboxymethyl cellulose) through a scalable, one-pot mechanochemical pathway. By tailoring the electrostatic complexation, the key element to form a highly crosslinked and interpenetrated polymer network structure, we formulate complex dispersion barrier coatings with excellent film-forming property and adaptable solid-viscosity profiles suitable for paperboard and molded pulp substrates. Our complex dispersions enable the formation of a uniform, defect-free, and integrated coating layer, leading to a remarkable oil and grease barrier and efficient water/moisture sensitivity reduction while still exhibiting excellent recyclability profile of the resulting fiber-based substrates. This natural, biorenewable, and repulpable barrier coating is a promising candidate to serve as a sustainable option for fiber-based packaging intended for the food and food service packaging industry. "The distribution of poly-DADMAC additive in the inkjet coating layer and its influence on the print quality", J. Jang et al, BioResources , Vol.18(1), 2023. Maximizing the functionality of cationic polydiallyldimethylammonium chloride (poly-DADMAC) additive with minimal dosage in inkjet coatings can contribute to both an improvement in quality and a cost reduction. To do this, it is essential to understand how the cationic additive is distributed in the coating layer and how it affects the print quality. This study presents a three-step investigation to enhance the understanding of the distribution of poly-DADMAC, as well as its effect on inkjet print quality. First, the adsorption behavior of poly-DADMAC on silica pigments was investigated by measuring the surface charge of silica and the adsorption of the cationic additive. Second, the influence of poly-DADMAC on the printability of binder films was investigated. Finally, the effect of poly-DADMAC on the print quality of inkjet paper was examined. The addition of poly-DADMAC improved the print quality of the inkjet paper because of the improved holdout of the negatively charged colorants in the ink. ENERGY “Digital twin for energy optimization in the paper drying process based on genetic algorithm and CADSIM Plus”, Yishui Zhang et al, World Scientific Proceedings Series on Computer Engineering and Information Science Machine Learning, Multi Agent and Cyber Physical Systems , 2023. Dryer section is the most energy-intensive part of the papermaking process, and the requirements for energy saving and consumption reduction in the dryer section is increasing with the constraints of the environment and energy. In order to reduce energy consumption, this paper proposes a method for constructing a paper dryer model based on digital twin: using the chemical simulation software CADSIM Plus combined with the dryer mechanism model to build a digital twin model. On this basis, the genetic algorithm is used to optimize its energy consumption. The results show that the optimized drying process parameters can achieve the effect of saving energy and reducing consumption.
Technical Abstracts
Page 2 of 13
Made with FlippingBook - professional solution for displaying marketing and sales documents online