FILTER MEDIUM, PARTICULARLY AN AIR FILTER MEDIUM AND FILTER ELEMENT, PARTICULARLY AN AIR FILTER ELEMENT, HAVING A FILTER MEDIUM

摘要

A filter medium, in particular an air filter medium (100), has a first filter layer (110) and a second filter layer (120). The first filter layer has a first filter layer section (111) and a second filter layer section (113), which is arranged in a flow direction (103) of the filter medium (100) behind the first filter layer section. The first filter layer section (111) has a first packing density of fibers and the second filter layer section (113) has a second packing density of fibers which differs from the first packing density of fibers. The second filter layer (120) is arranged in the flow direction (103) behind the first filter layer (110) and has nano fibers.