Laminated non-woven fabric filtering medium and method for produ

Details Laminated non-woven fabric filtering medium and method for produ Laminated non-woven fabric filtering medium and method for produ

1995-09-27

1997-03-11

Bell, James J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

28104, 28117, 428218, 4283105, 428903, 429247, 442384, 42831151, B32B 702

Patent

active

056099479

ABSTRACT:
A laminated non-woven fabric for filtering medium, which is composed of a plurality of non-woven fabric layers having different average pore sizes and laminated in the order of the average pore size, and a plurality of entangled regions interposed between any of adjacent two non-woven fabric layers which is formed by causing fibers of one of the adjacent two non-woven fabric layers to penetrate into the other layers to entangle the penetrated fibers with fibers of the other layers. The presence of the entangled regions provide a gradual change of the pore size from a non-woven fabric layer to another non-woven fabric layer to result in a good filtering efficiency and an elongated lifetime of a filter.

REFERENCES:
patent: 3120463 (1964-02-01), Russell
patent: 4251587 (1981-02-01), Mimura et al.
patent: 4970104 (1990-11-01), Radwanshi
patent: 5039431 (1991-08-01), Johnson et al.
patent: 5175042 (1992-12-01), Chomarat

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