Patent ID: 8685127
Filing Date: 2014-04-01
Classification: B01D

Abstract:
1. A compact filter comprising: a compact filter element for exchangeable use in a filter housing; said compact filter element comprising a filter body of a web-shaped filter medium; said web-shaped filter medium comprising at least one flat filter medium web and one corrugated filter medium web placed onto each other and at least partially connected to each other by ultrasonic welding; wherein at least one of said flat and corrugated filter medium webs is comprised of a composite filter medium web of at least two components, wherein at least one of said components is a synthetic material and at least one of said components is a non-synthetic material; wherein said synthetic material comprises fibers and said fibers have a mean fiber diameter that is between 0.5 micrometer and 20 micrometer; wherein said synthetic material has a bimodal distribution of fiber diameters of said fibers; wherein a first mean fiber diameter and a second mean fiber diameter that is smaller than said first mean fiber diameter; wherein a layer thickness of said synthetic material is approximately between 25 times and 300 times that of a smallest mean fiber diameter.