MEHRSCHICHTIGES FILTERMEDIUM

摘要

The present invention provides a self-supporting laminate filter medium having an electret lofty spunbond web and an electret microfiber web, the spunbond web having a density between about 0.01 g/cm<3> and about 0.1 g/cm<3>, wherein the electret lofty spunbond web comprises 5 wt% to 50 wt% of the filter medium, based on the total weight of the medium.