| 摘要 |
A molded thermoplastic filter plate (10, 50) having a peripheral rim (14, 54) which extends completely around the perimeter of and is integral with an inner web (12, 52) such that inner drainage faces (15, 53) are formed on each side of the plate (10, 50). Each side of the plate (10, 50) is divided into four triangular sectors (20, 22, 24, 26 and 60, 62, 64, 66). The boundary of each sector lies generally along a line extending from the center of the drainage face (15, 53) to a corner of the peripheral rim (14, 54), from the corner of the peripheral rim (14, 54) to an adjacent corner of the peripheral rim (14, 54), and from the adjacent corner back to the center of the drainage face (15, 53). Thus, each sector includes a corresponding side of the peripheral rim (14, 54). A plurality of drainage ribs (28, 68) are molded on the drainage face (15, 53) in each sector such that the ribs (28, 68) of a particular sector are parallel to the corresponding side of the peripheral rim (14, 54) in that particular sector.
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