Patent ID: 7137510
Filing Date: 2006-11-21
Classification: B01D,Y10T

Abstract:
1. A filter element comprising a plurality of filter medium layers joined together such that a fluid to be filtered flows successively through the layers in a flow direction commencing with an inflow layer and ending with a discharge layer, wherein successive layers in said flow direction exhibit an increasing degree of separation and a decreasing storage capacity for particles to be filtered out of said fluid, and wherein said inflow layer is comprised of synthetic fibers of a melt-blown nonwoven web with a fiber diameter of about 2 μm or less and a weight per unit area of about 15 to 150 g/m 2 , and said discharge layer is comprised of a predominantly cellulose-containing pre-compressed filter paper having a weight per unit area of about 50 to 200 g/m 2 .