ELECTROSTATIC AIR FILTER AND METHOD FOR MANUFACTURING THE SAME

PURPOSE: An electrostatic air filter is provided which improves filtration capability by manufacturing various types of filters spun with polymer fiber using air extrusion and increasing a surface charge density of the fiber at the same time, and a method for manufacturing the electrostatic air filter is provided. CONSTITUTION: The electrostatic air filter spun with polymer fiber of which surface charge density is increased is obtained by heating thus melting polymer resin(1) until it becomes a viscous fluid, spinning the molten material into micro polymer fiber before the material is deposited on a rotating target(5), and cooling the polymer fiber as the micro polymer fiber is being discharged with a corona discharger, wherein the target is in a drum or pleated shape, and the polymer resin(1) is polypropylene, polyethylene, or a mixture prepared by mixing polypropylene with polyethylene in a mixing ratio of 50:50. The method for manufacturing the electrostatic air filter spun with polymer fiber comprises the steps of heating thus melting a polymer material in an extruder(2) until it becomes a viscous fluid; depositing the molten polymer material on a revolving target(5), thereby forming a polymer spun fiber(4); and obtaining a polymer spun fiber(4) in which surface charge density is maximized, and static electricity is retained by cooling the deposited polymer spun fiber(4) as it is being discharged under a corona discharger, wherein an electric field of 10 to 40 kV is impressed to the corona, and the corona is positioned at the upper part of the spun fiber target(5).