Strength Preservation in Ozone Bleaching Using (D/Z) or (Z/D) at Low Consistency, 1998 Pulping Conference Proceedings

The combination of ozone and chlorine dioxide in the first stage of a pulp bleaching sequence provides considerable savings in operating and capital cost. Bleaching with (D/Z) or (Z/D) compared with control D was carried out at low consistency (2.5%). Several studies on various pulps were performed. The results thus far indicate no difference in strength between (D/Z) or (Z/D) pulps compared to D treated pulps. The amounts of O3 and ClO2 were adjusted in order to preserve the strength properties of the fully bleached pulp. Softwood and hardwood samples were tested, some were oxygen delignified before bleaching to full brightness. Instead of using viscosity as an indicator, curves of strength properties such as tear vs. tensile were compared, showing that (D/Z) or (Z/D) sequences can have equivalent or better strength than the control sequence.

Author: Fisher, S., Corbeil, S., Sundar, M.
Strength Preservation in Ozone Bleaching Using (D/Z) or (Z/D
Strength Preservation in Ozone Bleaching Using (D/Z) or (Z/D) at Low Consistency, 1998 Pulping Conference Proceedings
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