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Changes of HwBKP, SwBKP, OCC Handsheets' Drying Behavior and Physical Properties by Refining, Kneading and Wet Pressing  

Lee, Jin-Ho (Korea Research Institute of Chemical Technology, Chemical Biotechnology Research Center)
Park, Jong-Moon (Chungbuk National University, College of Agriculture, Life & Environment Sciences, Department of Forest Products & Engineering)
Publication Information
Journal of Korea Technical Association of The Pulp and Paper Industry / v.43, no.5, 2011 , pp. 17-26 More about this Journal
Abstract
Drying behavior and physical properties of HwBKP, SwBKP, and OCC handsheets depending on kneading, refining and wet pressing were analyzed. The maximum drying shrinkage velocity was newly adopted to verify the effect of mechanical treatment of pulps by evaluating drying behavior according to varying the kneading, refining and wet pressing treatments. Those various treatments were changed to evaluate the relationship between the maximum drying shrinkage velocity and handsheets properties. When the drying shrinkage and the maximum drying velocity increased by refining and wet-pressing, handsheets strength was increased. The maximum drying shrinkage velocity showed higher correlation with physical properties of paper than WRV at different refining loads at SwBKP and mixed pulp. At high wet-web dryness, drying shrinkage, the maximum drying shrinkage velocity and strength properties of handsheet were increased. It meant that drying shrinkage behavior was highly affected by not only fibers' shrinkage but also fiber bonding. Kneading pre-treatment for KOCC and SwBKP effectively modified fiber properties and increasing paper strength and drying shrinkage. The effect of kneading pre-treatment was also confirmed by the maximum drying shrinkage velocity. Strength properties of mixed pulp handsheets were not increased by the kneading pre-treatment, although the maximum drying shrinkage velocity and WRV was increased. It meant that fibers network bonding of HwBKP was limited because of ves sels and ray cells' interference for bonding. Therefore in order to improve paper strengths containing HwBKP by mechanical treatments, interference of vessels and ray cells for fiber bondings should be carefully controlled.
Keywords
strength; drying; shrinkage; WRV; refining; kneading; wet pressing; HwBKP; SwBKP; OCC;
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