PAPERmaking! FROM THE PUBLISHERS OF PAPER TECHNOLOGY Volume 6, Number 2, 2020
NANOSCIENCE Lignocellulosic nanofibers for the reinforcement of brown line paper in industrial water systems, Quim Tarrés, María Cristina Area, María Evangelina Vallejos, Nanci Vanesa Ehman, Marc Delgado-Aguilar & Pere Mutjé, Cellulose , Apr. 2020, DOI: 10.1007/s10570-020-03133-6. The addition of nanofibrillated cellulose in paper production requires attention to its dispersion and retention during the paper forming process, and this is commonly facilitated by the use of retention agents. The performance of retention agents, which commonly have a cationic charge, is affected by the presence of dissolved and colloidal substances in the process water. In the process of paper production at an industrial level, especially when using recycled paper, there are a large amount of dissolved and colloidal substances in the water. A high proportion of these substances are negatively charged and are commonly referred to as anionic trash. Its presence increases the conductivity and charge density of the water, and this has a negative influence on the retention of cellulose nanofibers. In brown line paper production, some fibers have already been refined in at least one previous papermaking cycle. In this sense, recycled fibers have a reduced capacity to benefit from refining as they have suffered morphological damage. On the other hand, the addition of lignocellulosic nanofibers in the production of brown line paper has been found helpful to improve its properties and extend its lifespan. In this work the influence on the retention of nanofibers of different anionic trash levels in the water has been evaluated. The results showed its viability as a reinforcing agent in waters with high anionic trash content, through the addition of an anionic trash catching system. Nanocellulose: its applications, consequences and challenges in papermaking, Atanu Kumar Das, Md. Nazrul Islam, Md Ashaduzzaman & Mousa M. Nazhad, Journal of Packaging Technology and Research , Aug. 2020, DOI: 10.1007/s41783- 020-00097-7 . This paper has aimed to bring out the state-of-the-art information about nanocellulose, its application in papermaking process, effect on paper properties and challenges. In papermaking process, nanocellulose is used as bionanofiller and bionanocoating material. The main objective of considering nanocellulose as a bionanofiller is to retain the strength properties after using inorganic filler, such as, GCC (ground calcium carbonate) and PCC (precipitate calcium carbonate); nanocellulose also helps to increase the filler content in paper sheet without loss of paper strength. That’s why, the application of nanocellulose as filler and coating material can solve the issues of using inorganic filler in papermaking industry. Though the production of nanocellulose needs higher energy, which increases the production cost in papermaking process, it can be minimized using different advanced technologies, such as, chemical and enzymatic pretreatment. Additionally, the incorporation of nanocellulose in recycled and virgin fiber increases some physical and strength properties of the paper. Furthermore, the increment of filler content in paper sheet due to incorporating nanocellulose can also reduce the amount of fiber in papermaking process, and it reduces the cost of fiber, which can mitigate the drawback of paper production cost because of adding nanocellulose partially. Therefore, nanocellulose has the potential to use for making value added paper and paper products to compensate the production cost. PACKAGING TECHNOLOGY Experimental Study on Moisture-Proof Coating for Corrugated Boards and Boxes, Chenyang Liu, Lijiang Huo, Yu Zhao & Yin Shang, Advanced Graphic Communication, Printing and Packaging Technology , https://doi.org/10.1007/978- 981-15-1864-5_57. Moisture-proof coating on the surface of corrugated boards and corrugated board box is one of effective methods to satisfy a requirement of logistics
Technical Abstracts
Page 6 of 15
Made with FlippingBook - Online catalogs