Filter media, elements, and methods

Patent metadata

Field	Value
Publication number	US-11845027-B2
Application number	US-202117499746-A
Country	US
Kind code	B2
Filing date	Oct 12, 2021
Priority date	May 13, 2016
Publication date	Dec 19, 2023
Grant date	Dec 19, 2023

Abstract

Fibrous filter medium that includes a surface-loading filter layer comprising fine fibers having an average diameter of less than 1 micron; a depth loading filter layer; and a support layer; wherein the layers are configured and arranged for placement in a gas stream with the surface loading filter layer being the most upstream layer.

First claim

What is claimed:

1. A gas filter medium comprising:
a surface loading filter layer;
a depth loading filter layer comprising glass fibers and multi-component binder fibers, wherein the depth loading filter layer displays a salt loading capacity of at least 1 g/m 2 at 500 Pascals pressure rise over initial; and
a support layer having a Gurley stiffness of 1000 milligrams or more;
wherein the layers are configured and arranged for placement in a gas stream with the surface loading filter layer being the most upstream layer.

2. The filter medium of claim 1 further comprising one or more additional layers comprising a surface loading filter layer, a depth loading filter layer, or a support layer.

3. The filter medium of claim 1 which is pulse cleanable according to Modified ISO 11057 Test Method.

4. The filter medium of claim 1 wherein the depth loading filter layer is positioned between the surface loading layer and the support layer.

5. The filter medium of claim 1 wherein the surface loading filter layer comprises fine fibers comprising nylon, polyvinylidene fluoride, polyurethane, or combinations thereof.

6. The filter medium of claim 1 wherein the surface loading filter layer has a LEFS filtration efficiency of at least 30%.

7. The filter medium of claim 1 wherein the depth loading filter layer comprises a high-efficiency melt-blown filter layer.

8. The filter medium of claim 1 wherein the depth loading filter layer displays a DEHS filtration efficiency of at least 55%.

9. The filter medium of claim 1 wherein the depth loading filter layer has a basis weight of up to 150 g/m 2 .

10. The filter medium of claim 1 wherein the support layer has an air permeability of at least 10 ft 3 /min at 125 Pa.

11. The filter medium of claim 1 wherein the support layer has an air permeability of at least 80.2 l/m 2 /sec at 200 Pa.

12. The filter medium of claim 1 wherein the depth loading filter layer comprises a hydrophobic coating.

13. The filter medium of claim 1 wherein the support layer has a basis weight of up to 260 g/m 2 .

14. The filter medium of claim 1 having a thickness of at least 10 mils (0.25 mm).

15. The filter medium of claim 1 which displays an efficiency of at least F9 per EN779:2012.

16. The filter medium of claim 15 which displays a filtration efficiency of at least 80%, per the DEHS efficiency test at the most penetrating particle size.

17. The filter medium of claim 1 wherein the support layer comprises wet-laid fibers comprising cellulose, polyester, or combinations thereof.

18. The filter medium of claim 1 wherein the layers are adhered together with adhesive, binder fibers, thermal bonding, ultrasonic bonding, self-adhesion, or combinations thereof.

19. The filter medium of claim 1 which is an air filter medium.

20. The filter medium of claim 1 wherein the surface loading filter layer comprises an oleophobic coating.

21. A gas filter element comprising a housing and a gas filter medium of claim 1 .

22. A gas filter medium comprising:
a surface loading filter layer;
a depth loading filter layer comprising a high-efficiency filter layer comprising glass fibers and multi-component binder fibers; wherein the depth loading filter layer displays a DEHS filtration efficiency of at least 55% and a salt loading capacity of at least 1 g/m 2 at 500 Pascals pressure rise over initial; and
a support layer;
wherein the layers are configured and arranged for placement in a gas stream with the surface loading filter layer being the most upstream layer, and
wherein the gas filter medium has a thickness of 0.25 mm to 0.76 mm.

23. A gas filter medium comprising:
a surface loading filter layer;
a depth loading filter layer comprising a high-efficiency filter layer comprising glass fibers and multi-component binder fibers; wherein the depth loading filter layer displays a DEHS filtration efficiency of at least 55% and a salt loading capacity of at least 1 g/m 2 at 500 Pascal pressure rise over initial;
a support layer having a Gurley stiffness of 1000 milligrams or more;
wherein the layers are configured and arranged for placement in a gas stream with the surface loading filter layer being the most upstream layer.

Assignees

• Donaldson Co Inc

Inventors

• Gao Qiong
• Dejong Richard Patrick
• Tronnes Gregory S
• Tiffany Jason A
• Izzi Giancarlo M

Classifications

• B01D39/1623 Primary

  of synthetic origin · CPC title

• B01D39/2017

  the material being filamentary or fibrous · CPC title

• B01D2239/025

  comprising nanofibres · CPC title

• B01D2239/065

  More than one layer present in the filtering material · CPC title

• B01D2239/0622

  Melt-blown · CPC title