Filter media for a liquid filter using an electrospun nanofiber web, method for manufacturing same, and liquid filter using same

A method of manufacturing a filter medium for a liquid filter, comprising the steps of:

• dissolving a polymer material in a solvent to obtain a spinning solution;
• air-electrospinning the spinning solution onto a supporter to form a layer of nanofiber on the support;
• repeating the air-electrospinning to form a nanofiber web formed of multiple layers of nanofiber;
• drying a surface portion of the nanofiber web by blowing air of about 30° C. at a speed of about 30 m/sec onto the surface portion of the nanofiber web, while moving the nanofiber web at a speed of about 30 msec, to adjust remaining solvent and moisture in the surface portion of the nanofiber web, thereby increasing strength of the surface portion of the nanofiber web;
• and
• heat compressing the surface portion dried-nanofiber web to adjust a porosity of the nanofiber web.