FILTER MEDIUM HAVING A NONWOVEN LAYER AND A MELT-BLOWN LAYER

摘要

The invention relates to a filter medium comprising a nonwoven layer, which has bicomponent fibers, and a melt-blown layer, which comprises polyester fibers having an average diameter (d1) of less than 1.8 µm. The thickness of the nonwoven layer is less than 0.4 mm at a contact pressure of 0.1 bar. At least 25% of the polyester fibers of the melt-blown layer have a diameter (d) of less than 1 µm.