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Effect of Combined Refining Plates with Different Bar Angles on Paper Properties during Mixed Pulp Refining

  • GUO, Xiya (College of Mechanical and Electrical Engineering, Shaanxi University of Science & Technology) ;
  • DONG, Jixian (College of Mechanical and Electrical Engineering, Shaanxi University of Science & Technology) ;
  • LIU, Huan (College of Mechanical and Electrical Engineering, Shaanxi University of Science & Technology) ;
  • DUAN, Chuanwu (College of Mechanical and Electrical Engineering, Shaanxi University of Science & Technology) ;
  • YANG, Ruifan (College of Mechanical and Electrical Engineering, Shaanxi University of Science & Technology) ;
  • QI, Kai (College of Mechanical and Electrical Engineering, Shaanxi University of Science & Technology)
  • Received : 2020.03.12
  • Accepted : 2020.06.29
  • Published : 2020.09.25

Abstract

Pulp refining is the major way to alter the properties of fibers and formed paper. Different combinations of the bar profile of the rotor and stator during low consistency refining processes directly affect the properties of the paper. In this study, a mixture of softwood and hardwood pulp was refined by varying the bar angle of the stator while that of the rotor is fixed at 0º. The pulp samples were collected at different refining times. Then, the pulp and paper properties, such as beating degree, fiber external fibrillation, and tensile and tear indexes were measured to explore the effects of the combined refining plates at different bar angles on paper properties. The results of the experiment show that the combined refining plate of 0º and 5º recorded the most significant improvement in the pulp beating degree and fiber external fibrillation. This consequently increased the fiber bonding area, which in turn, improved both the tensile and the tear indexes of the paper. Also, the influence of the combined refining plates with a larger bar angle on the paper properties was weaker compared to that of smaller angles. This study not only provides ideas for the bar profile design but also improves the optimal selection of refining plates.

Keywords

References

  1. Brecht, W., Athanassoulas, M., Siewert, W.H. 1965. The influence of the setting angle between the tackle bars on the performance of beaters and refiners. Das Papier 19: 93-96.
  2. Chauhan, V.S., Kumar, N., Kumar, M. 2011. Effect of separate and mixed refining of hardwood and softwood pulps on paper properties. Journal of Korea TAPPI 43(4): 1-10.
  3. Chi, L.X., Liu, W.Y., Zang, B.Q. 2015. Improvement and optimization of the disc using for low consistency refining. China Pulp & Paper 34(11): 42-44. https://doi.org/10.11980/j.issn.0254-508X.2015.11.009
  4. Clark, J.D.A. 1969. Fibrillation, free water and fiber bonding. Tappi Journal 52(2): 335-340.
  5. Elahimehr, A. 2014. Low consistency refining of mechanical pulp: the relationship between plate pattern, operational variables and pulp properties. Ph.D. Thesis, University of British Columbia, Canada.
  6. Fernando, D., Gorski, D., Daniel, G. 2014. Exploring mechanisms of fiber development during HC-and LC refining of mechanical pulps that govern pulp and paper properties. Helsinki, Finland, International mechanical pulping conference (IMPC 2014), pp. 1-7.
  7. Guo, X.Y., Dong, J.X., Liu, H., Jiang, X.J., Luo, C. 2019. Application of Quality Function Deployment (QFD) in Disc Refiner Segment Design. China Pulp & Paper 38(12): 44-49.
  8. Hammar, L.A., Salmen, R., Sandberg, R. 2010. The effect of process conditions on pulp quality development in low consistency refining of mechanical pulp-TMP. Appita Journal 63(5): 377-380.
  9. He, B. 2010. Refining, in papermaking principle and engineering, China Light Industry Press, Beijing, China.
  10. ISO 5267-1:1999. 1999. Pulps - Determination of drainability - Part 1: Schopper-Riegler method. International Organization for Standardization, Geneva.
  11. ISO 5269-1:2005. 2005. Pulps - Preparation of laboratory sheets for physical testing - Part 1: Conventional sheet-former method. International Organization for Standardization, Geneva.
  12. Jayme, G., Hunger, G. 1957. The fiber-to-fiber bonding in paper handsheets seen by means of electronmicrographs. Das Papier 11: 140-145.
  13. Kang, T. 2007. Role of external fibrillation in pulp and paper properties. Ph.D. Thesis, Helsinki University of Technology, Helsinki, Finland.
  14. Kasmani, J.E., Nazeri, A.M., Samariha, A. 2013. The effect of fiber external fibrillation on paper properties. Iranian Journal of Wood and Paper Science Research 28(1): 1-10.
  15. Li, W.P. 2002. Bar shape optimization of high consistency disc refiner. Hunan Papermaking (4): 9-10.
  16. Liu, H., Dong, J.X., Guo, X.Y., Luo, C., Tian, X.H., Jiang, X.J., Wang, S., Yang, R.F., Duan, C.W., Wang, B., Qi, K. 2019. Study on Fiber Cutting Performance of Isometric Straight Bar Plate with Different Bar Angle. Journal of Korea TAPPI 51(5): 16-26.
  17. Liu, Z. 2008. Introduction to pulping and papermaking. China light industry press, Beijing, China.
  18. Paavilainen, L. 1993. Importance of cross-dimensional fiber properties and coarseness for the characterization of softwood sulphate pulp. Paperi ja Puu (Paper and Timber) 75(5): 343-351.
  19. Peng, J., Liu, H. 2014. The main factors affecting bulk of paper and board. China Pulp & Paper 33(6): 64-69.
  20. Pfaffli, M. 2015. Rethinking the art of refining: Improving the efficiency and quality of refining. Beijing, China, International Mechanical Pulping Conference (CIPTE 2015), pp. 227-234.
  21. Roux, J.-C., Bloch, J-F., Nortier, P. 2009. The net normal force per crossing point: a unified concept for the low consistency refining of pulp suspensions. Oxford, UK, 14th Fundamental Research Symposium, pp. 51-67.
  22. Seth, R.S. 1990. Fiber quality factors in papermaking - I The importance of fibre length and strength, Proceedings Material Research Symposium Vol. 197, Ed. by Caulfield, D.F., Passaretti, D. and Sobczynski, S.F., Cambridge University Press, England, UK.
  23. Siewert, W., Selder, H. 1980. Economic use of energy in pulp refining. Appleton, USA, International Symposium on Fundamental Concepts of Refining, pp. 206-216.
  24. Shi, S.L., He, F.W. 2008. Pulp and paper analysis and testing. China light industry press, Beijing, China.
  25. Strachan, J. 1938. Some physical aspects of beating, Proceedings of the Technical Section. Ph.D. Thesis, Manchester, U.K.
  26. TAPPI T220 sp-01. 2001. Physical testing of pulp handsheets. TAPPI Press, Atlanta, GA.
  27. Vomhoff, H. 1990. The influence of the bar angle on the refining process in a disc refiner. Technical Report, Institute for Paper fabrikation at the Technische Hochschule Darmstadt.
  28. Wu, M. R., Lanouette, R., Valade, J. L. 2004. Understanding the fiber development during co-refining of white birch and black spruce mixtures. Part 1.Chemithermomechanical pulping. Pulp & Paper Canada 105(12): 83-87.
  29. Yang, J.S., Jiang, X.J. 2010. Refining energy saving by optimizing the plate of refiner. China Pulp & Paper 29(10): 77-78. https://doi.org/10.3969/j.issn.0254-508X.2010.10.018
  30. Zhang, M.Y., Xia, X.X. 2014. Papermaking technology. China light industry press, Beijing, China.