• DOI:10.3183/npprj-2006-21-01-p105-110
• Corpus ID: 94131236

Hydrogen peroxide bleaching of mechanical pulp fines

@article{Haugan2006HydrogenPB,
  title={Hydrogen peroxide bleaching of mechanical pulp fines},
  author={M. Haugan and {\O}yvind Weiby Gregersen},
  journal={Nordic Pulp \& Paper Research Journal},
  year={2006},
  volume={21},
  pages={105 - 110}
}

• M. Haugan, Ø. Gregersen
• Published 2006
• Materials Science
• Nordic Pulp & Paper Research Journal

Large amounts of fines from the different layers in the fiber wall have been produced by successive refining and screening. A pulp fraction rich in flake-like fines, primarily from the middle lamella, were screened out of the pulp after the first refining. A pulp fraction rich in fibrillar-like fines, primarily from the secondary wall, were screened out of the pulp after the third refining. The two types of fines were characterized both physically and chemically, and bleached with hydrogen peroxide. The flake-like fines contains 25% more lignin and 10 times more extractives than the fibrillar-like fines. The flakelike fines has a higher bleachability compared to the fibrillarlike fines, and it also needs more alkali to reach its minimum light absorption coefficient. UV-VIS reflectance measurements of different types of unbleached and bleached fines shows that the fibrillar-like fines has a much higher light absorption coefficient than the flake-like fines in the uv-region.