DEVICE FOR MANUFACTURE OF COMPOSITE FILTERING MATERIAL AND METHOD OF ITS MANUFACTURE

摘要

A device and method for producing a porous fiber structure. One or more points of high surface curvature is produced in a liquefied polymer such as a polymer solution or a polymer melt. The points of high surface curvature may be produced by forcing the liquefied polymer through narrow nozzles (6), or by wetting sharp protrusions (40) with the liquefied polymer. The liquefied polymer is charged to a high negative electrical potential relative to a grounded moving belt (10). Thin jets of liquefied polymer emerge from the points of high surface curvature to impinge as fibers on the moving belt (10), thereby forming a nonwoven fiber structure of relatively uniform porosity. A powdered aerosol is charged to a high positive electrical potential relative to the moving belt (10). As the belt (10) moves past the aerosol, the aerosol particles are attracted to fill interstices in the fiber structures, thereby creating a composite filtering material.