PAPER making! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL Volume 7, Number 3, 2021
surface wettability, water absorption, and mechanical properties of the coated sheet samples were evaluated and compared to the uncoated sample. It was found that mNFC could effectively provide an even and complete coverage coating layer on the BG-based sheet (BG/mNFC), thanks to the partially substituted ester groups. On the contrary, NFC could not be coated evenly on the BG-based sheet surface (BG/NFC) due to its tendency towards agglomeration. The homogeneity of surface obtained from the first layer coating by NFC or mNFC affected the surface quality of the second layer coating by shellac. As a result, the BG/mNFC/S bilayer coated sample showed the smoothest surface and also the highest water resistance confirmed by SEM, contact angle measurement, and water absorption results. Furthermore, the tensile properties of both bilayer coated samples (BG/NFC/S and BG/mNFC/S) were significantly improved (p<0.05) as compared to the uncoated BG sample. This results suggested that the current bilayer coating system is very promising for advancing the performance of molded pulps in novel packaging uses. “ Environmental Protection Status and Analysis of Pulp Molded Products Based on LCA ”, Xueqin Ni, Zimin Li, Zijie Cui, Danfei Liu & Yunfei Zhong, Advances in Graphic Communication, Printing and Packaging Technology and Materials , pp.466-470. Based on the life cycle assessment system, this paper summarized the environmental load caused by the three processes of raw material source, production and processing, waste and recycling. According to the data obtained from consulting literature, it is analyzed by Simopro7.1 software database, and the results show that the molded pulp products are not completely friendly materials. Finally, according to the results, this paper analyzes the improvement measures of the environmental hazards in the whole life cycle of pulp molded products, aiming at providing clear sustainable development direction and environmental protection guidance suggestions for the workers in environmental protection departments and pulp molded manufacturers. NANO-SCIENCE “ Role of cellulose nanofibrils in improving the strength properties of paper: a review ”, Thabisile Brightwell Jele, Prabashni Lekha & Bruce Sithole, Cellulose , published online (2021). The pursuit for sustainability in the papermaking industry calls for the elimination or reduction of synthetic additives and the exploration of renewable and biodegradable alternatives. Cellulose nanofibrils (CNFs), due to their inherent morphological and biochemical properties, are an excellent alternative to synthetic additives. These properties enable CNFs to improve the mechanical, functional, and barrier properties of different types of paper. The nanosize diameter, micrometre length, semicrystalline structure, high strength, and modulus of CNFs have a direct influence on the mechanical properties of paper, such as tensile index, burst index, Scott index, breaking length, tear index, Z-strength, E-modulus, strain at break, and tensile stiffness. This review details the role played by CNFs as an additive to improve strength properties of paper and the factors affecting the improvement in paper quality when CNFs are added as additives. The paper also includes techno-economic aspects of the process and identifies areas that need further research. “ Cellulose Nanofibrils as Reinforcement in the Process Manufacture of Paper Handsheets ”, Lívia Ribeiro Costa, Luiz Eduardo Silva, Lays Camila Matos, Gustavo Henrique Denzin Tonoli & Paulo Ricardo Gherardi Hein, Journal of Natural Fibres , published online: 17 Aug 2021. The objective of this study was to better understand the effect of micro/nanofibrils added as reinforcement on paper handsheets, their physical- mechanical performance and barrier properties, and to determine the ideal cellulose nanofibrils (CNF) proportion to increase such paper properties. Mechanically produced
Technical Abstracts
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