PAPER making! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL ® Volume 10, Number 2, 2024
COATING “Oil - and water- resistant paper coatings: A review”, Sumanta Basak, Milind Shrinivas Dangate & Shanmugha Samy, Progress in Organic Coatings , Vol.186, January 2024, 107938. Paper coatings based on petroleum-based compounds such as fluoro-compounds, polyethylene, and waxes are utilized to alter the properties of paper, such as wettability and oil and water transport. Although such polymers promote surface water resistance, their unfavorable qualities — poor recycling and lack of biodegradability — have led to their decline. However, using such non-renewable and non-biodegradable materials not only poses a threat to the environment and human health but also releases greenhouse gases. In addition, the use of plastic and fossil-fuel-based materials as barrier coatings in paper-based packaging boxes makes recycling difficult, enhancing overall recycling costs and causing environmental concerns about the waste created due to lack of biodegradation. Due to increasing worries about using petroleum-based polymeric packaging compounds and coatings and rising consumer demands for items with nutritive quality and prolonged shelf life, studies on alternative packaging materials are getting more popular. On the other hand, fresh techniques for environmentally friendly coatings may be constructed by employing biological polymers like polyesters, amino acids, and carbohydrates. These biopolymer coatings are powerful oil and water protectors that can substitute chemical-based paper and paperboard coatings. They could also stop inadvertent water transfer in food products. Nevertheless, many biopolymers may encounter challenges during manufacturing due to the material's innate water-holding capacity, crystallinity, and fragility, which precludes their usage in industrial applications. For that reason, it will be preferable to use polymer blends by combining them with other polymers, fillers, and plasticizers to enhance coating efficacy. This review paper will cover a detailed analysis of the water and oil resistance characteristics of several synthetic and naturally occurring polymers and their composites used as paper coatings for food packaging applications. The combination of polymers and their modifications with various agents and fillers can be utilized to build coatings that enhance the water and oil resistance of papers. There are also discussions about different coating techniques and the various solvents used to prepare coating solutions. Provincial Economic and Environmental Performance of Pulping Technologies”, Qian-long Han, Hai-long Zhao, Guo-xia Wei, Yu-wen Zhu*, Tong Li, Mao Xu, Xin Guo, Hui-zhen Shi, Yi Lian, & Han-qiao Liu, ACS Sustainable Chem. Eng . 2024, 12(11), 4517 – 4529. There are 100 million tonnes of carbon emissions from China’s paper industries, which attracts growing interest in their sustainability under the dual-carbon targets. Reasonable technological upgrading, waste paper recycling, and waste resource utilization can positively affect the sustainable development of paper manufacturing. Hence, the environmental and economic performance of paper from four pulping technologies (chemical mechanical, chemical, biomechanical, and waste paper pulping) were analyzed via Life Cycle Assessment (LCA) and Life Cycle Costing (LCC) methods. LCA results show that paper from chemical pulp is optimal, reducing 591.6 – 1385.7kg CO 2 equiv/t compared to others. LCC results indicate paper from biomechanical pulp has the highest economic benefits, with net profits outperforming others by $52.2 – 84.6/t. Moreover, environmental differences were investigated for papermaking wastes (black liquor (BL) and paper sludge (PS)) management options. The 80% caustic combustion of BL has the best environmental benefits, saving 154.3 – 331.6 kg of CO2 equiv/t compared to other methods. The production of paperboard from PS is more environmentally friendly, causing 200 kg of CO 2 equivalent/t less emissions than landfill. Finally, various waste paper recovery rates (60%, ENVIRONMENT “Sustainable Papermaking in China: Assessing
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Technical Abstracts
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