PAPER making! g! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL ® Volume 10, Number 1, 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. “Whole whey As A New In Bulk Additive During Papermaking and Paper Coating Processes”, Tamer YA Fahmy, Mohamed El Ǧ Sakhawy, Amal Abdel Kader & Mohamed Diab, Egyptian Journal of Chemistry (in preparation). The present work introduces whole whey as a new in bulk additive during papermaking and paper coating processes. In bulk Addition of whole whey to pulp during papermaking, as well as, paper coating with whole whey both succeeded in promoting strength of paper and decreasing its water vapor permeability in comparison to paper, which did not involve whole whey as an additive. Previous studies, by the authors and others, have shown that each of the three major components of dairy products, as an isolate, improves paper properties (protein isolates, sugars, and fat isolates). Whey is a dairy Industry byproduct - involving these three non-isolated components. Whole whey - including the three non-isolated previous mentioned components - has not been evaluated for papermaking. Using whole whey for paper improvement is more money, time, and energy saving compared to separating each component and using it alone as isolate. Moreover, such approach avoids the use of chemicals and processes required for isolation of the previous mentioned dairy components. This would increase the sustainability of both milk and paper industries by finding new uses for dairy industry byproducts and improving paper properties through natural environmentally safe additives in contrast to synthetic additives.
Technical Abstracts
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