# US 11,298,645 B2 · Filtration media pack, filter element, and methods

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- Number: US 11,298,645 B2
- Document ID: US11298645B2
- Status: Granted
- Kind: B2
- Application number: 16/735,412
- Filed: 2020-01-06
- Published: 2020-05-07
- Granted: 2022-04-12
- Earliest claimed: 2007-06-26
- Assignees: Donaldson Company, Inc.
- Applicants: Donaldson Company, Inc.
- Inventors: Gary J. Rocklitz; Robert M. Rogers; Daniel E. Adamek; Ming Ouyang; Anitha M. Mathew
- Web page: https://patentgrep.com/patent/US11298645B2

## CPC

- B01D 46/526: {in stacked arrangement}
- B01D 46/0001: {Making filtering elements}
- B01D 46/522: {with specific folds, e.g. having different lengths}
- B01D 46/525: {which comprises flutes}
- B01D 46/527: {in wound arrangement}
- Y10T 156/10: Methods of surface bonding and/or assembly therefor
- 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

A 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 to a second face of the filtration media pack. A first portion of the plurality of flutes are closed to unfiltered fluid flowing into the first portion of the plurality of flutes, and a second portion of the plurality of flutes are closed to unfiltered fluid flowing out of the second portion of the plurality of flutes so that fluid passing into one of the first face and the second face of the media pack and out the other face of the media pack passes through media to provide filtration of the fluid.

## Claims

### Claim 1

A filtration media pack comprising:
(a) a plurality of layers of filter media wherein the layers of filter media comprise a folded sheet and a facing sheet with spaces between the layers;
(b) a first portion of the spaces between the layers of filter media being closed to unfiltered fluid flowing into the first portion of the spaces between the layers, and a second portion of the spaces between the layers being closed to unfiltered fluid flowing out of the second portion of the spaces between the layers, so that fluid passing into one face of the media pack and out another face of the media pack passes through media to provide filtration of the fluid; and
(c) wherein the folded sheets comprise first peaks and second peaks, and at least a portion of the folded sheets have a crease aligned so that it approaches toward a first peak and away from a second peak.

### Claim 2 (depends on 1)

A filtration media pack according to claim 1, wherein the folded sheet comprises repeating internal peaks facing toward the facing sheet and repeating external peaks facing away from the facing sheet and a pattern of at least one ridge extending along at least 50% of the flute length between an internal peak and an adjacent external peak.

### Claim 3 (depends on 2)

A filtration media pack according to claim 2, wherein the folded sheet comprises at least two ridges along at least 50% of the flute length between an internal peak and an adjacent external peak.

### Claim 4 (depends on 2)

A filtration media pack according to claim 2, where at least two ridges are provided in a pattern between an internal peak and an adjacent external peak.

### Claim 5 (depends on 1)

A filtration media pack according to claim 1, wherein the filtration media pack has a fold width height ratio of greater than 2.5 of a flute height ratio of less than 0.4.

### Claim 6 (depends on 1)

A filtration media pack according to claim 1, wherein the filtration media pack has an average flute density of less than 25 flute/inch.

### Claim 7 (depends on 1)

A filtration media pack according to claim 1, wherein the filtration media pack has an average media-cord percentage of greater than 6.5%.

### Claim 8 (depends on 1)

A filter element comprising a filtration media pack according to claim 1 and a seal member extending around a periphery of the media pack.