| 摘要 |
A rotary drum-type vacuum filter in which the grids which support the flexible filter medium over the filtering compartments of the drum are respectively formed to provide one or more corrugations extending generally in the direction of the drum axis and defining one or more channels, said corrugations also defining valleys in addition to said channels and into which the flexible filter medium is sucked during its immersion in the slurry being filtered to form corrugations in the filter media which mate with said valleys. Thereafter, when the filter medium emerges from the slurry with a filter cake formed thereon said mating corrugations, the channels are eliminated by removal of the filter medium from the drum for passage on to the discharge roll. Such elimination of the mating corrugations from the flexible filter medium and the resulting elongation of the filter medium relative to the less flexible filter cake, facilitates the separation of the cake from the medium.
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