Filter media with irregular structure

Patent metadata

Field	Value
Publication number	US-11433332-B2
Application number	US-201816181242-A
Country	US
Kind code	B2
Filing date	Nov 5, 2018
Priority date	Nov 5, 2018
Publication date	Sep 6, 2022
Grant date	Sep 6, 2022

Abstract

Articles and methods relating to filter media are generally provided. In some embodiments, a filter media has an irregular surface structure. For instance, the filter media may comprise a plurality of peaks that are irregular in one or more ways. A ratio of a peak height standard deviation to an average peak height may be greater than or equal to 0.05, and/or a ratio of a peak spacing standard deviation to an average peak spacing may be greater than or equal to 0.08. In some embodiments, a filter media comprises a non-woven fiber web having a layer thickness of greater than 0.3 mm and/or a stiffness of less than or equal to 100 mg.

First claim

What is claimed is:

1. A filter media, comprising:
a non-woven fiber web, wherein:
the non-woven fiber web has a stiffness of less than or equal to 100 mg;
the non-woven fiber web has an average surface height of greater than 0.3 mm;
the non-woven fiber web has an air permeability of greater than or equal to 2 CFM;
the non-woven fiber web comprises a plurality of peaks having an average peak height and a peak height standard deviation; and
the ratio of the peak height standard deviation to the average peak height is greater than or equal to 0.15 and less than or equal to 0.5.

2. A filter media, comprising:
a non-woven fiber web, wherein:
the non-woven fiber web has an air permeability of greater than or equal to 2 CFM;
the non-woven fiber web comprises a plurality of peaks having an average peak height and a peak height standard deviation;
a ratio of the peak height standard deviation to the average peak height is greater than or equal to 0.15 and less than or equal to 0.5; and
the non-woven fiber web has an average surface height of greater than 0.3 mm.

3. The filter media of claim 2 , wherein the non-woven fiber web is a meltblown fiber web.

4. The filter media of claim 2 , wherein the non-woven fiber web is charged.

5. The filter media of claim 2 , wherein the filter media has a gamma of greater than or equal to 15.

6. The filter media of claim 2 , wherein the filter media has an air permeability of greater than or equal to 2 CFM.

7. A filter element comprising the filter media of claim 2 .

8. The filter media of claim 2 , wherein the filter media has an air permeability of greater than or equal to 20 CFM.

9. The filter media of claim 2 , wherein the filter media further comprises a scrim.

10. The filter media of claim 9 , wherein the scrim is a mesh.

11. The filter media of claim 9 , wherein the scrim is a spunbond web.

12. The filter media of claim 9 , wherein the scrim is capable of undergoing a reversible stretch of at least 50% along at least one axis.

13. The filter media of claim 9 , wherein the non-woven fiber web is adhered to the scrim by an adhesive.

14. The filter media of claim 2 , wherein the filter media further comprises a second non-woven fiber web.

15. The filter media of claim 14 , wherein the second non-woven fiber web is an electrospun fiber web.

16. The filter media of claim 15 , wherein the non-woven fiber web is a meltblown fiber web, and wherein the electrospun fiber web and a scrim are positioned on opposite sides of the non-woven fiber web.

17. The filter media of claim 2 , wherein the filter media comprises a support layer.

18. The filter media of claim 17 , wherein the support layer holds the non-woven fiber web in a waved configuration and maintains separation of peaks and troughs of adjacent waves of the non-woven fiber web.

Assignees

• Hollingsworth & Vose Co

Inventors

• Smith Bruce
• Silin Maxim
• Healey David T

Classifications

• B01D2239/0631

  Electro-spun · CPC title

• B01D2239/0681

  The layers being joined by gluing · CPC title

• B01D2239/0627

  Spun-bonded · CPC title

• B01D2239/0618

  Non-woven · CPC title

• B01D2239/1275

  Stiffness · CPC title