Abstract
An experimental study on softwood pulp flocs was performed to obtain an improved understanding of floc structure and floc strength. The work highlights morphological studies of model flocs and their strain behavior under tensile loading. The studies showed that the pulp flocs used are a composite of several concentrated regions separated by weaker interfaces. The dispersion of such flocs is by fracture at the interfaces. The fracture of several of these interfaces gives multiple yield points on a stress-strain plot. The fracture itself is by the slipping of fibers from the network and not by the breakage of fibers. The observed slippage supports the view that mechanical entanglement of fibers can be one of the main causes of fiber flocculation.
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