Dimensionally stabilized breathable membrane

Details Dimensionally stabilized breathable membrane Dimensionally stabilized breathable membrane

1994-11-22

1997-08-12

Spear, Frank

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

156178, 21050027, 442394, B01D 6912

Patent

active

056561679

ABSTRACT:
A breathable membrane and a method of constructing a fabric having the membrane, wherein the membrane is resistive to transport of liquid water, has a layer of breathable material and is stabilized dimensionally against distension by a force field, such as forces which may be applied to the membrane or resulting from a hydrostatic pressure, by a reinforcing matrix of nonwoven filaments extending in plural directions along the layer of breathable material to inhibit the distension. In the matrix, the filaments are arranged in a first plurality of the filaments which intersect a second plurality of the filaments to form cells. A minimum diameter of an individual one of the cells is greater by at least approximately an order of magnitude than a diameter of one of the filaments to provide open areas of the layer of breathable material which are free from obstruction by the filaments. The reinforcing matrix may be embedded within the layer of breathable material, or fused to a surface of the layer of breathable material. Alternatively, the filaments are provided with a coating of adhesive for securing the filaments adhesively to a surface of the layer of breathable material. The membrane may include a layer of fibers, such as cellulosic fibers, wherein individual fibers of the layer of fibers are enveloped by the breathable material. The membrane is suitable for construction of a surgical gown or drape preventing transmission of pathogens, a covering for a wall of a house, as well as a covering of a container for industrial processes.

REFERENCES:
patent: 3444025 (1969-05-01), Hillas
patent: 3751329 (1973-08-01), Fonzi et al.
patent: 3949111 (1976-04-01), Pelletier
patent: 4433026 (1984-02-01), Molde
patent: 4507356 (1985-03-01), Watabe
patent: 4808675 (1989-02-01), Twilley et al.
patent: 4898761 (1990-02-01), Dunaway et al.
patent: 5342469 (1994-08-01), Bodford et al.

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