Abstract
The mechanism of water removal from pulp suspensions was studied by laboratorial filtration and the compression-permeability tests. The mechanism can be explained by the Kozeny-Carrnan relationship, on the narrow range of frictional pressure drop across the pulp bed (10-100cm W.C.). However, at the relatively high pressure stress existing under filtration conditions, the Kozeny-Carman relationship could not be employed in the usual manner, as the Kozeny constant and the specific surface increased with the increase of the pressure stress. Morecover, it was difficult to relate the physical properties of the pulp fibers to the average specific resistance, because of the considerable decrease of the effective specific volume of fibers. For estimating the approximae value of the average specific resistance under the high press, the graphical integration of equation (8) with the compression-permeability data may be used.
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