# US 9,517,430 B2 · Air filtration media pack, filter element, air filtration media, and methods > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,517,430 B2 - Document ID: US9517430B2 - Status: Granted - Kind: B2 - Application number: 14/198,246 - Filed: 2014-03-05 - Published: 2014-11-06 - Granted: 2016-12-13 - Earliest claimed: 2007-02-02 - Assignees: Donaldson Company, Inc. - Applicants: Donaldson Company, Inc. - Inventors: Gary J. Rocklitz; Robert M. Rogers; Ming Ouyang; Anitha Mathew - Web page: https://patentgrep.com/patent/US9517430B2 ## CPC - B01D 46/526: {in stacked arrangement} - B01D 46/522: {with specific folds, e.g. having different lengths} - B01D 46/525: {which comprises flutes} - B01D 46/527: {in wound arrangement} - Y10T 156/1016: Transverse corrugating - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract An air filtration media pack is provided having a plurality of layers of single facer media. The layer of single facer media includes a fluted sheet, a facing sheet, and a plurality of flutes extending between the fluted sheet and the facing sheet and having a flute length extending from a first face of the filtration media pack to a second face of the filtration media pack. A first portion of the plurality of flutes are closed to unfiltered air flowing into the first portion of the plurality of flutes, and a second portion of the plurality of flutes are closed to unfiltered air from flowing out of the second portion of the plurality of flutes so that air passing into one of the first face and the second face of the media pack and out the other of the first face and the second face of the media pack passes through media to provide filtration of the air. The fluted sheet includes repeating internal peaks facing toward the facing sheet and repeating external peaks facing away from the facing sheet. In addition, the fluted sheet can include at least one ridge extending along at least 50% of the flute length between an internal peak and an adjacent external peak. Additional characterizations of an air filtration media pack, air filtration media, and methods of making and using are provided. ## Claims ### Claim 1 A fluted media sheet configured for fluid filtration defining a repeating pattern of flutes having flute peaks extending along a flute length, wherein the repeating pattern of flutes defines at least one ridge extending along at least 50% of the flute length, wherein the ridge is defined between adjacent flute peaks and comprises a discontinuity in the curvature of the media, and wherein the media comprises cellulose; wherein at least a portion of the flutes have peaks defining an edge. ### Claim 2 (depends on 1) A fluted media sheet according to claim 1, wherein the repeating pattern of flutes comprises at least two ridges extending along at least 50% of the flute length, wherein each ridge is between adjacent peaks. ### Claim 3 (depends on 2) A fluted media sheet according to claim 2, wherein the two ridges are non-parallel to each other. ### Claim 4 (depends on 1) A fluted media sheet according to claim 1, wherein at least some of the flutes are tapered. ### Claim 5 (depends on 4) A fluted media sheet according to claim 4, wherein the tapered flutes have a taper in cross-sectional area. ### Claim 6 (depends on 1) A fluted media sheet according to claim 1, wherein the flutes define an upstream volume and a downstream volume having media volume asymmetry of at least 10%. ### Claim 7 (depends on 6) A fluted media sheet according to claim 6, wherein the media volume asymmetry is at least 20%. ### Claim 8 (depends on 1) A fluted media sheet according to claim 1, wherein the flutes extend between an inlet flow face of a filter element defined by a first set of folds in the media sheet and an exit flow face of a filter element defined by a second set of folds in the media sheet. ### Claim 9 (depends on 1) A fluted media sheet according to claim 1, wherein at least a portion of the flutes exhibit a flute width height ratio of greater than about 2.2. ### Claim 10 A fluted media sheet configured for fluid filtration defining a repeating pattern of flutes having flute peaks extending along a flute length, wherein at least some of the flutes exhibit a taper in cross-sectional area and wherein at least some of the peaks define an edge; wherein the repeating pattern of flutes defines at least one ridge extending along at least 50% of the flute length, wherein the ridge is defined between adjacent flute peaks and comprises a discontinuity in the curvature of the media. ### Claim 11 (depends on 10) A fluted media sheet of claim 10 comprising a cellulose-based media. ### Claim 12 (depends on 10) A fluted media sheet of claim 10, wherein the flutes define an upstream volume and a downstream volume having media volume asymmetry of at least 10%. ### Claim 13 (depends on 12) A fluted media sheet of claim 12, wherein the media volume asymmetry is at least 20%. ### Claim 14 (depends on 10) A fluted media sheet of claim 10, wherein the flutes extend between an inlet flow face of a filter element defined by a first set of folds in the media sheet and an exit flow face of a filter element defined by a second set of folds in the media sheet. ### Claim 15 (depends on 10) A fluted media sheet of claim 10, wherein at least a portion of the flutes exhibit a flute width height ratio of greater than about 2.2. ### Claim 16 A fluted media sheet configured for fluid filtration defining a repeating pattern of flutes having flute peaks extending along a flute length, wherein at least some of the flutes exhibit a taper in cross-sectional area and wherein at least some of the peaks define an edge; wherein at least a portion of the flutes have a media cord percentage of at least 6.2%. ### Claim 17 (depends on 16) A fluted media sheet of claim 16, comprising a cellulose-based media. ### Claim 18 A fluted media sheet configured for fluid filtration defining a repeating pattern of flutes having flute peaks extending along a flute length, wherein at least some of the flutes exhibit a taper in cross-sectional area and wherein at least some of the peaks define an edge; wherein the repeating pattern of flutes comprises at least two ridges extending along at least 50% of the flute length, wherein each ridge is between adjacent peaks. ### Claim 19 (depends on 18) A fluted media sheet of claim 18, wherein the ridges are non-parallel to each other. ### Claim 20 (depends on 18) A fluted media sheet of claim 18, comprising a cellulose-based media.