| 摘要 |
A vacuum filter belt (20) supporting a filter cloth (26) has transverse channels (34) leading to vacuum outlets (36). The belt is bounded by kerbs (38), each of which comprises a lower longitudinal region (42) which is longitudinally straight and curves smoothly into the top surface of the belt, and an upper longitudinal region (40) which is longitudinally sinusoidal, providing recesses (44) with surfaces (46) which slope downwardly towards the centre of the belt. The filter cloth (26) covers the belt and extends over the lower longitudinal region (42) and partway up the upper longitudinal region (40) of each kerb. The kerbs can flex as the belt passes around end rollers, and yet preserves a high filtering efficiency without requiring undue accuracy in tracking the filter cloth. |
