Coreless and spirally wound non-woven filter element

Details Coreless and spirally wound non-woven filter element Coreless and spirally wound non-woven filter element

1995-10-24

1998-10-27

Walker, W. L.

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

210504, 210505, 210508, 156195, 156280, 428 363, 428 3691, B01D 2706

Patent

active

058274308

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.

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