Filter media with irregular structure

Patent metadata

Field	Value
Publication number	US-12036496-B2
Application number	US-202217873960-A
Country	US
Kind code	B2
Filing date	Jul 26, 2022
Priority date	Nov 5, 2018
Publication date	Jul 16, 2024
Grant date	Jul 16, 2024

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. An article, comprising:
a layer, wherein:
the layer comprises a plurality of peaks having an average peak spacing and a peak spacing standard deviation;
a ratio of the peak spacing standard deviation to the average peak spacing is greater than or equal to 0.08;
the layer has an average surface height of greater than 0 3 mm;
the average surface height is an average of relative heights of each point in a relative surface topography with respect to a reference height; and
the reference height is a height of which 95% of the points making up a measured surface topography are above and 5% of the points making up the measured surface topography are below.

2. An article, comprising:
a layer, wherein:
the layer 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;
the layer has an average surface height of greater than 0 3 mm;
the average surface height is an average of relative heights of each point in a relative surface topography with respect to a reference height; and
the reference height is a height of which 95% of the points making up a measured surface topography are above and 5% of the points making up the measured surface topography are below.

3. The article of claim 2 , wherein the layer is a meltblown fiber web.

4. The article of claim 2 , wherein the layer is charged.

5. The article of claim 2 , wherein the article has an air permeability of greater than or equal to 2 CFM.

6. The article of claim 2 , wherein the article has an air permeability of greater than or equal to 20 CFM.

7. The article of claim 2 , wherein the article further comprises a scrim.

8. The article of claim 7 , wherein the scrim is a mesh.

9. The article of claim 7 , wherein the scrim is a spunbond web.

10. The article of claim 7 , wherein the scrim is capable of undergoing a reversible stretch of at least 50% along at least one axis.

11. The article of claim 7 , wherein the layer is adhered to the scrim by an adhesive.

12. The article of claim 2 , wherein the article further comprises a second layer.

13. The article of claim 12 , wherein the second layer is an electrospun fiber web.

14. The article of claim 13 , wherein the layer is a meltblown fiber web, and wherein the electrospun fiber web and a scrim are positioned on opposite sides of the layer.

15. The article of claim 2 , wherein the article comprises a support layer.

16. The article of claim 15 , wherein the support layer holds the layer in a waved configuration and maintains separation of peaks and troughs of adjacent waves of the layer.

17. The article of claim 2 , wherein the layer comprises a plurality of undulations, and wherein the plurality of undulations comprises the plurality of peaks.

Assignees

• Hollingsworth & Vose Co

Inventors

• Smith Bruce
• Silin Maxim
• Healey David T

Classifications

• B01D2239/0622

  Melt-blown · CPC title

• B01D2239/0654

  Support layers · CPC title

• B01D2239/0631

  Electro-spun · CPC title

• B01D2239/0627

  Spun-bonded · CPC title

• B01D2239/0241

  comprising electrically conductive fibres or particles · CPC title