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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Impact of Residual Extractives in Kraft Pulps on Brightness and Color

  • Shin, Soo-Jeong (Department of Wood and Paper Science, College of Agriculture, Life, and Environment Sciences, Chungbuk National University) ;
  • Sung, Yong-Joo (Dept. of Biobased Materials, College of Agriculture and Life Science, Chungnam Natl. Univ.) ;
  • Park, Jong-Moon (Department of Wood and Paper Science, College of Agriculture, Life, and Environment Sciences, Chungbuk National University) ;
  • Cho, Nam-Seok (Department of Wood and Paper Science, College of Agriculture, Life, and Environment Sciences, Chungbuk National University)
  • Published : 2009.12.30
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Abstract

Residual extractives had a noticeable impact on the brightness of unbleached hardwood kraft pulps (trembling aspen). The brightness-impacting extractives were effectively removed by oxygen delignification. In addition, oxygen delignification was more effective in removing chromophores in hardwood unbleached kraft pulps than in those of softwood (loblolly pine). The residual extractives in unbleached hardwood kraft pulps also affected the pulp color, primarily redness and the L value. These redness-related extractives in unbleached hardwood kraft pulps were also effectively removed by oxygen delignification. There were no significant color differences between untreated and solvent-extracted oxygen-delignified aspen kraft pulps. The residual extractives in unbleached and oxygen-delignified softwood (loblolly pine) kraft pulps did not have a significant impact on either brightness or pulp color.

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References

  1. Dence, C.W., The Determination of Lignin. In Methods in Lignin Chemistry; Lin, S.Y. and Dence, C.W., (Eds.), Springer-Verlag: Berlin,pp. 33-70 (1992)
  2. Shin, S.-J., Schroeder, L.R. and Lai, Y.-Z., Impact of residual extractives on lignin determination in kraft pulps, J. Wood Chem. Technol. 24(2): 139-152 (2004) https://doi.org/10.1081/WCT-200026567
  3. Kyriacou, P, De Jong, E., Johansson, C. I., Chandra, R. P., and Saddler, J. N., Bleaching of western red cedar and Douglar-fir mechanical pulps, Tappi , 81(6):188-195(1998)
  4. TAPPI T204 om-97, Solvent Extraction of Wood and Pulp, TAPPI Press, Atlanta(1998)
  5. TAPPI T452 om-98, Brightness of Pulp, Paper and Paperboard (Directional reflectance of 457 nm), TAPPI Press, Atlanta(1998)
  6. TAPPI T527 om-94, Color of Paper and Paperboard in CIE System, TAPPI Press, Atlanta(1998)