Patent ID: 11478734

Abstract:
A filter medium is provided. The filter medium according to an embodiment of the present invention comprises: a first support body having a plurality of pores; a nanofiber web comprising nanofibers disposed on upper and lower sides of the first support body and forming a three dimensional network structure; and a second support body having a plurality of pores interposed between the first support body and the nanofiber web, wherein the nanofiber web is realized as a filter medium that satisfies: (1) an elongation of 25% or more, (2) an air permeability of 0.1 to 2.00 cfm, and 3) porosity of 60%˜85%. Accordingly, since the filter medium has a fixed level of mechanical properties of the nanofiber web, the shape, structure deformation, and damage of the filter medium are minimized and a flow path is smoothly secured during a water treatment operation so that the filter medium can have a high flow rate. In addition, since the filter medium of the present invention has a prolonged use life due to excellent durability of the filter medium even at high pressure applied during backwashing, and has excellent filtration efficiency and water permeability, the filter medium can be applied in various ways in various water treatment fields.