PAPER making! g! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL ® Volume 11, Number 2, 2025
application of biopolymers in pulp and paper industries is focusing in improving the paper products performance especially for packaging paper products. Two promising sustainable materials are nanocellulose and chitosan. Nanocellulose, known for its abundance and biodegradability, serves as an effective additive in paper production, enhancing strength, retention, filtration, and coating properties. Chitosan, derived from chitin, the second most abundant polysaccharide in nature, is a renewable, non-toxic biomaterial with high cationic charge density, antibacterial properties, and excellent biocompatibility with cellulose. Its integration into papermaking enhances both dry and wet strength by forming hydrogen bonds with nanocellulose, thus improving the physical, mechanical, thermal, and antimicrobial properties of paper. The synergy between nanocellulose and chitosan not only enhances the overall quality of the paper but also supports the production of various types of paper, including packaging, printing, speciality, and textile paper. This approach underscores the role of sustainable biomaterials in innovating the papermaking industry while reducing its environmental footprint. PRINTING “Intelligent modeling of printability of liner paper coated with modified soda lignin”, Omid Ghaffarzadeh, Maryam Ataeefard, Sahab Hedjazi, Ali Abdulkhani & Mohammad J. Taherzadeh, Biomass Conversion and Biorefinery , online. This research aimed to investigate the production of a sizing agent based on lignin extracted from the soda pulping black liquor. The crude lignin was subjected to chemical modifications, including sulfomethylation and amination, to improve its reactivity and to increase its solubility in water. Unmodified (crude), sulfomethylated, and aminated lignin were combined with starch and then applied on the surface of test liner papers. In this study, surface, mechanical, colorimetric, and printability properties were modeled via an innovative approach called the artificial intelligence method. The effect of ratios of crude lignin, sulfomethylated and aminated lignin, and even starch portion were investigated on the paper properties, i.e., tensile strength and ring crush test (RCT) as well as optical properties, i.e., L*, a*, and b* indices and optical density and roughness of the treated handsheets by surface. The developed code can appropriately learn the non-linear behavior process and make decisions according to the pattern constructed intelligently. The paper treated with unmodified lignin exhibited an increase in the roughness value, according to the results. It was illustrated that applying a layer based on the unmodified lignin solution increased the tensile index. Also, it caused a relative increase in the tensile index of paper when a sizing solution based on sulfomethylated/aminated lignin was implemented. The value of the RCT for the paper treated with unmodified lignin and even the paper treated using the aminated lignin was as high as the treated paper just based on pure starch. There was no discernible variation in the colorimetric indices between papers treated with the black ink. The findings showed that the treatment containing pure starch had the lowest value of optical density, and the control treatment had the closest value to it. The data about alternative treatments showed that a paper treated with pure lignin without starch has the highest optical density. PULP & PULPING “Biopulping, biobleaching, and deinking”, Xiao Guo, Xinming Wu, Bo Wang & Fufeng Liu, Chapter 18 in Forest Microbiology Vol.4: Biotechnology Applications in Forestry , 2025, pp.307-322. In recent years, the papermaking industry has experienced rapid growth, yet it faces significant environmental challenges such as pollution and high energy consumption. Consequently, there is an urgent need for eco-friendly pulp and papermaking technologies. Biotechnology, characterized by its environmentally friendly nature, has emerged as a promising solution. Current applications of biotechnology in pulp and papermaking include biopulping, biobleaching, and deinking of waste paper. However,
Technical Abstracts
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