| 摘要 |
A screw press type filter which comprises an alternately superposed arrangement of annular fixed plates (10) and annular movable plates (11), a filter cylinder (2) defining a fixed cylindrical space (12) by a row of openings of the fixed plates with both end portions of a screw (5) passed through this cylindrical space extending to inlet and outlet chambers (1, 3), and mechanisms (15, 16) for turning the movable plates in accordance with the rotation of the screw also provided, wherein the volumes of the spaces between adjacent ridges of the screws in the filter cylinder are reduced gradually from an inlet toward an outlet so that such a volume decrease corresponds to a gradual decrease in the water content of an object material being processed.
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