Patent ID: 6387141
Filing Date: 2002-05-14
Classification: B01D,D04H,Y10S

Abstract:
An air filter having a depth filter material comprising:a nonwoven fabric having a upstream side and a downstream side, the nonwoven fabric being formed of adhesively and/or cohesively bonded fibers; wherein said fibers are comprised of first-thickness-type fibers and second-thickness-type fibers, said first-thickness-type fibers having greater thickness than said second-thickness-type fibers, and said first-thickness-type and second-thickness-type fibers have intertwinements which are produced by liquid-jetting from the downstream side prior to the adhesive and/or cohesive bonding, and wherein the liquid-jetting results in the fibers being compacted increasingly from the upstream side toward the downstream side in such a way that differently compacted regions are formed, in which particles of different size can be separated, each of the differently compacted regions having said first-thickness-type fibers and said second-thickness-type fibers.