, Volume 1, Issue 4, pp 221–235 | Cite as

A study on the ink-fiber interfacial interaction in waste printed paper I. The effect of a custom-designed polymeric additive on flotation de-inking of solvent-treated wastepapers

  • Mohini M. Sain
  • Claude Daneault
  • Lorenzo Marchildon
Research Papers


The effect of interaction between solvent and three different kinds of printed wastepaper has been studied. The solubility parameter of the solvent was found to be among the most important in order to obtain an optimum ink-fiber interfacial swelling, necessary for de-inking wastepaper. The degree of ink-fiber interfacial swelling was qualitatively estimated by examining the dispersity of ink particles using an optical microscope. FT-IR analyses were carried out to correlate the degree of dispersion and the ink composition in the printed wastepapers studied. The effect of a selective swelling solvent on the de-inking characteristics of a mixture of old wastepapers was investigated. The solvent treatment of these wastepapers prior to flotation de-inking failed to add any positive effect on the brightness of the de-inked pulp. On the other hand, the incorporation of a custom-designed polymer additive improved the pulp brightness without any solvent treatment. The same additive played a negative role in the presence of a swelling solvent. The function of the polymer additive in the flotation de-inking process is also described.


oil- and water-based inks printed paper solvent interface polymer surfactant flotation 


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Copyright information

© Blackie Academic & Professional 1994

Authors and Affiliations

  • Mohini M. Sain
    • 1
  • Claude Daneault
    • 1
  • Lorenzo Marchildon
    • 1
  1. 1.Pulp and Paper Research CenterUniversite du Québec a Trois-RivièresTrois-RivièresCanada

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