Composite filter media

Details Composite filter media Composite filter media

1998-02-17

1999-09-07

Theisen, Mary Lynn

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264518, B27N 304

Patent

active

059483440

ABSTRACT:
A composite filter media includes a fibrous filtration layer of randomly oriented fibers and one or more pleatable stiffening layers which enable the composite filter media to be pleated and hold or retain its pleats. The pleatable stiffening layer(s) may enhance the dirt holding capacity of the composite filter media especially when positioned upstream of the fibrous filtration layer. The composite filter media may also include a flexible covering layer which functions to block the loss of fibers from the fibrous filtration layer. Preferably, the mean fiber diameter of the fibers in fibrous filtration layer increases and the density of the fibrous filtration layer decreases throughout the thickness of the fibrous filtration layer from one major surface to the other major surface of the fibrous filtration layer.

REFERENCES:
patent: 4141772 (1979-02-01), Buell
patent: 4146564 (1979-03-01), Garrick et al.
patent: 4961974 (1990-10-01), Jones

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