PAPER making! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL ® Volume 8, Number 3, 2022
COATING “Influence of pigment and binder composition on the dynamic water penetration and dried structure of precoating layers for double-coated paper”, Hye Jung Youn & Hak Lae Lee, Journal of Coatings Technology and Research , Vol.19, 931-938 (2022). The influence of precoating colors on the dynamic water penetration behavior of double- coated paper was investigated using a laboratory coater equipped with two coating heads. Emphasis was placed on the effects of the pigment combination and binder type on dynamic water penetration. In addition, the latex content on the surface of the coating layer was examined by UV absorbance analysis. The amount of water that penetrated the base paper was found to be proportional to the square root of the contact time between the coating color and the base paper, regardless of the pigments and binders used. When a large amount of pigment with a fine particle size was used, or the starch binder content was increased, the low shear viscosity of the coating color increased, and the amount of water penetration into the base paper decreased. The UV absorbance analysis showed that higher water holding in the coating color increased the latex content on the surface of the coating layer. Increasing the viscosity or water retention of the coating color was found to reduce the amount of binder migration into the base paper. ECONOMICS “Analysis of the impact of circular economy over linear economy in the paper processing industry”, E. Sakthivelmurugan, G. Senthilkumar & K.N. Karthick, Materials Today Proceedings , Vol.66(3), 1446-1452 (2022). In the present scenario, the linear economy principles are widely used in all fields. As per the linear economy concern once the product is utilized and treated as a waste. In the future, the raw material requirement plays a vital role in many fields because of the lack of availability of resources. To meet the future demand, we need to focus on new techniques, methodologies, and principles for the effective utilization of resources. Given literature, the linear economy principles are replaced by the circular economy in many sectors. As per the circular economy concern, the waste product is again utilized as an input for making secondary products. In this paper, an attempt is made on the effective utilization of paper waste for making secondary products using circular economy techniques. The 9R model is used for the subjective study of various stages of paper-making processes. In addition to that, the fuzzy DEMATAL method is used for pairwise comparison of the linear economy, circular economy, and paper waste. Further analysis is carried out on how the solid waste and waste heat are treated as an input for making secondary products such as agricultural products, fuel, etc. ENERGY “Decarbonization of a tissue paper plant: Advanced numerical simulations to assess the replacement of fossil fuels with a biomass-derived syngas”, Lorenzo Giuntini, Rachele Lamioni, Luca Linari, Pietro Saccomano, Davide Mainardi, Leonardo Tognotti & Chiara Galletti, Renewable Energy , Vol.198, 884-893 (Oct. 2022). Numerical simulations based on Computational Fluid Dynamic techniques are performed to analyze the possibility of feeding a biomass-derived syngas into the combustion chamber upstream of the hoods for tissue-paper drying, to replace fossil fuels and thus decarbonize the plant. It was observed that, in the context of Favre-Averaged Navier–Stokes equations simulation, syngas requires detailed kinetics and finite-rate approaches, as the fast-chemistry ones, largely employed in the industrial practice for conventional fuels, lead to unreliable results. The actual chamber, originally designed to be fed with liquid petroleum gas, does not operate properly when fueled with syngas, with incomplete oxidation of carbon monoxide. Numerical simulations have proven how very
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Technical Abstracts
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