Journal of Korea Technical Association of The Pulp and Paper Industry (펄프종이기술)

Korea Technical Association of the Pulp and Paper Industry (한국펄프종이공학회)
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Changes of HwBKP, SwBKP, OCC Handsheets' Drying Behavior and Physical Properties by Refining, Kneading and Wet Pressing

고해, 니딩, 습부압착에 의한 HwBKP, SwBKP, OCC 수초지의 건조 거동 및 물성 변화

  • 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)
  • 이진호 (한국화학연구원 산업바이오화학연구센터) ;
  • 박종문 (충북대학교 농업생명환경대학 임산공학과)
  • Received : 2011.11.28
  • Accepted : 2011.12.22
  • Published : 2011.12.30
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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

References

  1. Clark, J. d'A., Pulp Technology and Treatment for Paper, Second Ed., Miller Freeman Publications Inc., San Francisco, pp. 100-118 (1985).
  2. Page, D. H., and DeGrace, J. H., The delamination of fibre walls by beating and refining, Tappi J. 50(10): 489-495 (1967).
  3. Stone, J. E., and Scallan, A. M., The effect of component removal upon the porous structure of the cell wall of wood II, Swelling in water and the fibre saturation point, Tappi J. 50(10):496-501 (1967).
  4. Emerton, H. W., The theory of the development in pulps of papermaking characteristics by mechanical treatment, In Fundamentals of the Beating Process, Tech. Soc. B. P. & B. I. R. Kenley, UK, pp. 133-144 (1957).
  5. Sinkey, J. D., Fundamental concepts of refining, International symposium, IPC, Appleton, Wisconsin, pp. 16-18 (1980).
  6. Abitz, P., and Luner, P., The effect of refining on wet fiber flexibility and its relationship to sheet properties, In Fundamentals of Papermaking, Baker, C. F., and Punton, V. (ed.), Vol. 1, Mech. Eng. Pub., London, pp. 67-86 (1989).
  7. Cropper, M. A., Advances in deinking and its use in improving quality of newsprint, 1976 Papermakers Conference Proceeding, TAPPI Press, Atlanta, pp. 93-96.
  8. Ortner, H., and Fisher, S., The application of dispersion for quality improvement of deinked pulps, Progress in Paper Recycling 1(1):46-53 (1991).
  9. Johansson, O., and Steffner, S., Field experience gained in the new deinking plant at Hylte Bruks AB, EUCEPA Symposium, Ljbljana, pp. 23-27 (1989).
  10. 서형일, 류정용, 신종호, 송봉근, 오세균, 고지재생연구(제3보)-부유부상 및 니딩 처리에 의한 라이너지의 강도 및 광학적 성질 개선, Journal of Korea TAPPI 31(1): 17-22 (1999).
  11. Britt, K. W., and Unbehend, J. E., Water removal during sheet formation, Tappi J. 63(4):67-70 (1980).
  12. Springer, A., Nabors, L. A., and Bhatia, O., The influence of fiber, sheet structural properties and chemical additives on wet pressing, Tappi J. 74(4): 221-228 (1991).
  13. Caufield, D. F., Young, T. L., and Wegner, T. H., The role of web properties in water removal by wet pressing, Characterization of dewatering time constant, Tappi J. 65(2):65-69 (1982).
  14. Wegner, T. H., Young, T. L., and Caulfield, D. F., Role of fiber geometry in water removal by wet pressing, Tappi, J. 66(4):85-88 (1983).
  15. Young, T. L., Caulfield, D. F., and Wegner, T. H., Role of web properties in water removal by wet pressing; Influence of basis weight and forming method, Tappi J. 66(10):100-102 (1983).
  16. Stratton, R. A., Use of polymers in wet pressing, 1982 Papermakers Conference Proceedings, TAPPI Press, Atlanta, pp. 179-182.
  17. Campbell, W. R., The Cellulose-water relationship in papermaking, Bull. For. Ser. 84, Canada Dept. Interior, Printer to the King's most excellent Majesty, p.52 (1933).
  18. Paulapuro, H., Wet pressing-present understanding and future challenges, In The Science of Papermaking, Baker C. F.(ed.), Vol. 1, The Pulp and Paper Fundamental Research Society, UK, pp. 639-678 (2001)
  19. Szikla, Z., and Paulapuro, H., Z-direction distribution of fines and filler material in the paper web under wet pressing conditions, Paperi Ja Puu, 68(9):654-664 (1986).
  20. Szikla, Z., and Paulapuro, H., Changes in z-direction density distribution of paper in wet pressing, J. Pulp and Paper Science 15(1):J11- J17 (1989).
  21. Page, D. H. and Tydeman, P. A., A new theory of the shrinkage, structure and properties of paper, In Formation and Structure of Paper, Balam, F. (ed.), Vol. 1, BPBMA, London, pp. 397-425 (1962).
  22. Jentzen, C. A., The effect of stress applied during drying on some of the properties of individual pulp fibers, Tappi J. 47(7):412-418 (1964).
  23. 이진호, 건조수축 해석을 통한 종이의 건조 스트레스평가와 벌크 및 강직성 향상 기작 규명, 2011년 농학박사학위논문, 충북대학교(2011).