| 摘要 |
A tubular filter element for use in a tube-type filter includes an externally-ribbed plastic core which is hollow throughout its length and which is surrounded by a coarsely-perforated plastic sleeve. The sleeve serves to space an outer finely-perforated cake-supporting tube from the core. A pair of plastic end members fit over and are heat welded to the core and the sleeve, the upper member being apertured. The core is apertured such that liquid passing through the outer tube and the sleeve passes downwardly along the outer surface of the core and up through the hollow cavity in the core during a filtering operation and in the reverse direction during a cake removal operation.
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