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The increased use of medium-consistency high shear mixers in bleach plants has resulted in significant changes in fiber morphology as pulp is processed through a fiberline. Samples were collected after individual stages in two mills employing ECF bleaching and medium-consistency processing. Significant changes in fiber curl and kink were observed. Handsheet properties were also measured. Straightening of the fibers from laboratory PFI mill refining significantly increased the strength properties. Losses in viscosity were reflected by losses in fiber strength but the magnitude of the change in fiber strength was considerably less than the change in viscosity. A significant decrease in fiber strength across the fiberline was seen in one mill but was minimal in the other. This appears to be due to the presence of an oxygen stage and the process conditions used in the D1 stage.
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Effects of Bleach Plant Processing on Fiber Strength, 2002 Fall Technical Conference
