Patent ID: 7318852

Claim:
A filter bag for an industrial bag house, the bag comprising: (a) a layer of a polyester filter bag substrate having a thickness greater than about 0.2 mm, a layer of fine fiber on the upstream surface of the substrate, the fine fiber layer having a fiber diameter of about 0.01 to 5 micron and a basis weight of about 0.0005 to 0.2 mg-cm −2 , said fine fiber layer having a thickness of about 1 to 100 times the diameter of the fine fiber, the polyester filter bag substrate layer having a permeability of at least 2 m-min −1 and an efficiency of at least 20% when measured according to ASTM-1215-89, with 0.78 micron monodisperse polystyrene spherical particles, at 20 fpm (6.1 meters/min).