Duplex filter cloth and method

Details Duplex filter cloth and method Duplex filter cloth and method

1990-05-21

1993-02-16

Bell, James J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including stitching and discrete fastener, coating or bond

112440, 112441, 1122621, 1122622, 1122623, 210505, 428192, 428193, B32B 306

Patent

active

051869985

ABSTRACT:
A duplex filter cloth for chamber type filters has two initially separate pieces secured together, as by stitching, around circumferential terminal edges of turned-down collar portions of the respective pieces, which portions are closely and smoothly interlapped to provide a barrel neck for the duplex filter cloth. Turning down of the collar portions is accomplished by an elongate conical mandrel of a jig press which operates relative to mandrel-receiving openings in pairs of bed plates, inserted in turn in such jig press, to effectively turn-down circumferential marginal portions of filtrate feed openings of respective flat filter cloth sheets.

REFERENCES:
patent: 4545833 (1985-10-01), Tafara

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