Method of making a filter element

Details Method of making a filter element Method of making a filter element

1997-09-03

1999-04-13

Savage, Matthew O.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156172, 156195, D04H 154

Patent

active

058939563

ABSTRACT:
A homogeneous mixture of a base and a binder material or fiber that is compressed to form a mat or sheet of selected porosity. The binder material has at least a surface with a melting temperature lower than that of the base fiber. The sheet is formed into a selected geometric shape and thermally fused to bind the base fiber into a porous filter element. The preferred shape is a helically wound tube of plural sheets, each sheet being self-overlapped and compressed to overlap another sheet. Each sheet preferably heated and compressed individually and the sheets may be selected to have different porosities and densities. The binder fiber is selected from the group consisting of thermoplastic and resin, and the base fiber is selected from the group consisting of thermoplastic and natural.

REFERENCES:
patent: 4116738 (1978-09-01), Pall
patent: 4293378 (1981-10-01), Klein
patent: 4713285 (1987-12-01), Klein
patent: 4869855 (1989-09-01), Twilley et al.
patent: 4983193 (1991-01-01), Tani et al.
patent: 5230726 (1993-07-01), Smith et al.
patent: 5646077 (1997-07-01), Matsunaga et al.

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