PAPER making! g! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL ® Volume 11, Number 1, 2025
PRINTING “ Investigation and modeling of paper drying in digital-printing ”, Dominic Meier, Julian Messer, Tim Slawik, Thomas Lex, Harald Klein & Sebastian Rehfeldt, Applied Thermal Engineering , Vol.269, Part A, 15 June 2025, 125766. Digital-printing with water-based inks on liner papers for the packaging industry is an emerging technology requiring thermal drying to achieve abrasion-resistance. However, the high energy consumption and associated emissions of hot air dryers necessitate optimized drying processes to improve energy efficiency and production control. While drying models for papermaking and conventional printing have been extensively studied, they are often too complex for practical application in production environments or lack validation under real-world conditions. To address these challenges, this study investigates the drying characteristics of printed liner paper using a unique production-sized testing facility. A novel simplified numerical model predicts web temperature and moisture content, introducing two parameters to account for reduced drying rates in the diffusion-controlled stage. A sensitivity analysis quantifies the influence of the model parameters on the predicted drying characteristics. For the first time, systematic validation of simulation results is performed through experimental monitoring of web temperature and moisture content, with a comprehensive estimation of measurement errors. Infrared-based temperature measurements for web temperature reveal a systematic error of +4°C to −16°C while moisture content measurements show an error range of −0.5 to +2% (absolute), primarily due to environmental factors. The proposed model demonstrates good agreement with experimental data, with deviations falling within the estimated total error, offering a reliable tool for energy-efficient drying process optimization. PULP “Chimeric enzymes in the pulp and paper making industry: Current developments”, Abdullah Arsalan, Yuvaraj Ravikumar, Xinrui Tang, Zijing Cao, Mei Zhao, Wenjing Sun & Xianghui Qi, Biotechnology Advances , Vol.79, March – April 2025, 108530. The pulp and paper (P&P) industry plays a vital role in supporting the social and economic progress of a country by supplying essential commodities. Conventional P&P processing often consumes significant energy and use chemical agents to produce hazardous intermediates. The use of enzymes in the P&P industry has significantly reduced both the chemical and energy demands during processing. A variety of enzyme combination cocktails are used to perform multiple functions in a single step, but often fail to operate synergistically because of significant differences in operational conditions. This lack of synergy under various operating conditions highlights the need for engineered chimeric enzymes. Moreover, enzyme engineering approaches enable enzymes to perform catalysis in sub-optimal environment. Enzymes have been engineered to improve their catalytic properties and enhance operational stability. Designing multifunctional or chimeric enzymes can function simultaneously across diverse operational conditions. Chimeric enzymes enable effective synergistic action of multiple enzymes in the P&P industry. This review aims to provide clear insights into the selective development of chimeric enzymes using enzyme engineering approaches for their effective use in the P&P industry. TESTING “ Surface and in-depth characterization of commercial papers by LIBS technique: Parameters and features for their classification, and complementary information from Raman spectroscopy ”, Flavio Cicconi & Violeta Lazic, Spectrochimica Acta Part B: Atomic Spectroscopy , Vol.224, Feb. 2025, 107112. In examination of documents by LIBS technique, the paper material is usually probed by surface scanning and the averaged spectra are processed by chemometric methods. The scope of this work is to have insight
Technical Abstracts
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