Flexible filter bag and method of fabrication

Details Flexible filter bag and method of fabrication Flexible filter bag and method of fabrication

B - Operations, Transporting

01

D

93/75, 183/83

B01D 29/25 (2006.01) B01D 29/11 (2006.01) B01D 29/27 (2006.01)

Patent

CA 1315711

42489 CAN lA Flexible Filter Bag and Method Of Fabrication ABSTRACT A flexible filter bag, the filter element of which is seamless and avoids prior leakage problems, is made by wrapping a flexible, preferably perforated, filtering fabric and a flexible nonfiltering transport material together onto a cylindrical mandrel to provide a tube. A thin metal ring is fitted into the tube, and the portion of the filtering fabric which extends beyond the edge of the transport material is folded inwardly around the ring to provide a cuff. A sleeve of a length about twice that of the tube is inserted into and pulled over the tube until the free ends of the sleeve are approximately coterminous with the ring-free end of the tube. The free ends of the sleeve and tube are gathered in the manner of a sausage casing and then subjected to pressure to form a seal, but the convolutions of the transport material terminate just short of the seal so as to avoid bunching at the seal.

576059

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