Abstract:
Anisometric compressed and bonded knitted wire mesh composites are provided which comprise a plurality of sheets of knitted wire mesh, superimposed at random orientation with respect to each other, compressed or densified to a voids volume within the range from about 10 to about 90 percent, and bonded together. The sheets are taken in sufficient number, usually at least five and preferably 10 or more, and as much as 1,000 or more, to form a self-supporting relatively non-resilient composite of high tensile strength and high breaking strength having an average pore diameter of less than 200 microns, and preferably less than 100 microns, that is relatively uniform in any unit area of the surface, and having an anisometric porosity, the through pores extending crosswise of the sheet greatly exceeding in number the through pores extending laterally of the sheet, which latter pores can be reduced virtually to zero in a highly compressed composite. The composite is formed by superimposing a plurality of knitted wire mesh sheets, annealing the composite to avoid wire breakage during later processing, compressing the composite to the desired density and anisometricity by application of pressure in a direction approximately perpendicular to the plane of the layers of the composite, and bonding the sheet layers and the wire filaments of the sheets together at their points of contact and/or crossing. The bonding holds the composite at the selected density, prevents relative movement of the wires in the composite, and in conjunction with the multilayer structure imparts the self-supporting nonresilient characteristic, together with high tensile strength and high breaking strength.
Abstract:
LAMINATED FILTER ENDS SHEETS, A PROCESS FOR MAKING THEM AND FILTER ELEMENTS MADE OF SUCH LAMINATED FILTER SHEETS ARE PROVIDED. A COMPOSITE OF A MICROPOROUS FILTERING PLY, AND A REINFORCING PLY COMPRISING A THIN POROUS SHEET COMPOSED AT LEAST IN PART OF POTENTIALLY ADHESIVE ADHESIVE FABRIC IS SUBJECTED TO PRESSURE UNDER CONDITIONS POTENTIATING THE ADHESIVE OF THE REINFORCING PLY TO EFFECT A BOND BETWEEN THE FABRIC AND THE SURFACE OF THE FILTERING PLY IN CONTACT THEREWITH WITHOUT SUBSTANTIALLY DECREASING THE POROSITY OF THE FILTERING PLY. THE RESULTING FILTER SHEET OR ELEMENT CAN BE FITTED WITH END CAPS FOR SUPPORTING THE FILTER SHEET IN A HOUSING FOR THE FILTRATION OF FLUID.
Abstract:
A corrugated cylindrical filter element is disposed about a central core. A perforated plastic bonding sheet is disposed between the core and the filter. The bonding sheet is bonded in situ to the inner tips of the corrugations only.