Nonwoven material of two or more layers, in particular with long

Details Nonwoven material of two or more layers, in particular with long Nonwoven material of two or more layers, in particular with long

1990-12-04

1994-02-01

Bell, James J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

55524, 55527, 55528, 156148, 156291, 156297, 1563082, 428134, 428136, 428212, 428215, 428219, 428284, 428286, 428296, 428297, 428298, 428300, 428181, B32B 2714

Patent

active

052831060

ABSTRACT:
There is disclosed a multilayered filter material comprising nonwovens made of fibers or filaments of identical or different polymers, said filter material being composed of a depth filter and a fine filter which both have a homogeneous density perpendicular to their surface and have been joined together in such a way that the area covered by the bonding dots does not exceed 75%. The depth filter is from 2 to 20 times thicker than the fine filter, and they have different densities. There is also disclosed a process for manufacturing the filter material.

REFERENCES:
patent: 4377615 (1983-03-01), Suzuki et al.
patent: 4761322 (1988-08-01), Raley
patent: 4765812 (1988-08-01), Homonoff et al.
patent: 4818586 (1989-04-01), Smith et al.
patent: 5079074 (1992-01-01), Steagall et al.

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