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Retention behavior of size and aluminum components in handsheets prepared in rosin soap size-alum systems

Abstract

Handsheets were prepared with rosin soap size and aluminum sulfate under various conditions, and the retention behavior of the rosin size and aluminum components in the handsheets was studied. Pyrolysis-gas chromatography and X-ray fluorescence analysis were used to determine the size and aluminum contents in the handsheets, respectively. When the addition level of rosin soap size varied from 0% to 4% and that of aluminum sulfate was fixed at 2%, the rosin size content increased with the increase in the size addition level, whereas aluminum and calcium contents were roughly constant. Under these conditions, handsheets prepared from fines-free pulp had aluminum contents less than those for the original beaten pulp, probably because the former pulp had a carboxyl content less than that of the latter pulp. Not only the conventional rosin retention mechanism but also mechanism proposed below must exist in the rosin soap size-alum systems. That is, some aluminum compounds originating from aluminum sulfate are adsorbed on pulp fibers immediately after the aluminum sulfate addition. These adsorbed aluminum compounds form cationic sites on pulp fibers, and free rosin acid components with anionic charges are then adsorbed onto the cationic sites of pulp fibers at the wet-end.

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Correspondence to Akira Isogai.

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Ohno, K., Isogai, A. & Onabe, F. Retention behavior of size and aluminum components in handsheets prepared in rosin soap size-alum systems. J Wood Sci 45, 238–244 (1999). https://doi.org/10.1007/BF01177732

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Key words

  • Rosin soap size
  • Aluminum sulfate
  • Retention Sizing
  • Paper