Water Release from Fractionated Stock Suspensions. 1. Effects of the Amounts and Types of Fiber Fines, 2008 PAPERCON Conference

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Tests with a gravity-based freeness device demonstrated a highly non-linear effect of cellulosic fines on resistance to dewatering. Fines at low to moderate levels had little effect on gravity dewatering, but fines slowed drainage considerably as their level increased beyond a threshold. Fines created by refining (secondary fines) slowed drainage to a much greater extent than those originally present in bleached hardwood kraft pulp (primary fines). The results were consistent with a mechanism in which unattached fines can migrate within a wet web to choke points at which they tend to block the flow of water.