Abstract
The filtration of polyvinyl chloride particles of 5–12 in water has been investigated under constant pressure and constant rate conditions. The porosity of the cake was measured at different levels by means of the electrical resistance between gauge pins. A form of ‘retarted packing compressibility’ has been found in which the first layers of cake do not compress gradually but only after a critical cake thickness has been reached. This critical cake thickness can be reduced by the addition of a deflocculant.
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