PAPER making! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL ® FROM THE PUBLISHERS OF PAPER TE Volume 8, Number 2, 2022
Relationship between wettability of pulp fibers and tensile strength of paper during recycling HAILAN JIN 1,4, RYOTA KOSE 2 , NOBUSHIGE AKADA 3 & TAKAYUKI OKAYAMA 2 . The wettability of the paper surface is greatly affected by the wettability of the pulp fibers. We conducted this study in order to understand the relationship between the wettability of a single fiber of recycled pulp and the strength of recycled paper, as well as the inter-fiber bonding strength. The contact angle was determined from a series of photographs of the pulp fiber and the water silhouettes at the point of contact. The contact line and profile history were continuously photographed in every 1 s after the initial contact. The recycled softwood kraft pulp fibers were clearly much less hydrophilic than the original fibers, regardless of whether the fibers had been bleached or not. The contact angle of the original chemi-thermomechanical pulp fiber was much higher than that of the original softwood bleached kraft pulp fiber. Furthermore, increased number of recycling decreased the contact angle of the chemi-thermomechanical pulp fiber. The Page equation was used to evaluate the strength contributions of single fiber and fiber – fiber bonding to tensile strength of paper. As a result, an increase in weakness factor of fiber – fiber bonding strength was obtained for the recycled softwood kraft pulp handsheet. On the other hand, the weakness factor of the original chemi-thermomechanical pulp handsheet decreased with recycling. In addition, the weakness factor of fiber – fiber bonding strength and the contact angles of the provided softwood bleached kraft pulp fibers bore a proportional relationship to each other. Contact information: 1. Key Laboratory of Bio-based Material Science & Technology (Northeast Forestry University) Ministry of Education, No. 26 Hexing Road, Harbin 150040, China. 2. Division of Natural Resources and Eco Ǧ Materials, Institute of Agriculture, Tokyo University of Agriculture and Technology, 3 Ǧ 5 Ǧ 8 Saiwai Ǧ cho, Fuchu, Tokyo 183 Ǧ 8509, Japan. 3. Faculty of Agriculture, Tokyo University of Agriculture and Technology, 3 Ǧ 5 Ǧ 8 Saiwai Ǧ cho, Fuchu, Tokyo 183 Ǧ 8509, Japan. 4. State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China.
Nature Scientific Reports 2022, 12, 1560. https://doi.org/10.1038/s41598-022-05514-2 Creative Commons Attribution 4.0 License
The Paper Industry Technical Association (PITA) is an independent organisation which operates for the general benefit of its members – both individual and corporate – dedicated to promoting and improving the technical and scientific knowledge of those working in the UK pulp and paper industry. Formed in 1960, it serves the Industry, both manufacturers and suppliers, by providing a forum for members to meet and network; it organises visits, conferences and training seminars that cover all aspects of papermaking science. It also publishes the prestigious journal Paper Technology International ® and the PITA Annual Review , both sent free to members, and a range of other technical publications which include conference proceedings and the acclaimed Essential Guide to Aqueous Coating .
Article 1 – Recycling and Wettability
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