Filter element
AssigneeFilterwerk Mann & Hummel GmbH
InventorsGunnar-Marcel Klein, Nikolaus Moser
Life of this patent
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Abstract
A filter element in which several layers (2, 3, 5, 7, 8) made of a filtering medium are joined contiguously in the direction of flow with at least one layer (2, 7) made of a filtering medium with a high storage capacity and a low degree of separation being arranged on the in-flow side and at least one layer (3, 8) made of a filtering medium with a low storage capacity and a high degree of separation being arranged on the out-flow side. Preferably the in-flow filtering medium is made of a filter paper containing cellulose or of a melt-blown material, and the out-flow side filtering medium is produced from a filter paper containing cellulose.
Claims11
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/m2, 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/m2.
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/m2 or of a predominantly cellulose-containing filter paper, with a weight per unit area of 50 to 200 g/m2, 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/m2.
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/m2, and said discharge layer is comprised of a predominantly cellulose-containing pre-compressed filter paper having a weight per unit area of at least about 50 g/m2.
Dependencies are inferred from the claim text.