Nonwoven filter material.

摘要

Improved microfibrous filtration laminate (10) comprising a highly permeable layer of a self-supporting nonwoven fabric (12) which provides support for a layer of a randomly intertangled nonwoven mat (14) of electret-containing microfibers of synthetic polymer is disclosed. The filtration laminate (10), which is particularly useful as disposable filter bags or as a lining material for disposable paper filter bags for vacuum cleaners, is characterized by thickness and handling characteristics approaching that of paper filter material typically used in disposable vacuum clean bags but having improved performance in the areas of an immediate, high particle capture efficiency, minimal flow restriction and long service life.