Filter media comprising dissimilar electrically charged layers

Details Filter media comprising dissimilar electrically charged layers Filter media comprising dissimilar electrically charged layers

B - Operations, Transporting

03

C

183/49

B03C 3/30 (2006.01) B01D 39/16 (2006.01) B01D 39/20 (2006.01)

Patent

CA 1190486

-16- FILTER MEDIA COMPRISING DISSIMILAR ELECTRICALLY CHARGED LAYERS Abstract Filter media comprising at least two electrically charged electrostatically dissimilar filter layers. The layers are electrostatically dissimilar in that they produce electrostatic fields that differ in kind. Representative different electrically charged filter layers are webs of electrically charged melt-blown fibers; webs of electri- cally charged fibrillated-film fibers; and rosin-wool filter webs. The combination of at least two of such differing webs removes surprisingly high percentages of particles from an aerosol, greater than predicted by what each layer normally removes by itself.

381165

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