Filter media with irregular structure and/or reversibly stretchable layers

Patent metadata

Field	Value
Publication number	US-11420143-B2
Application number	US-202016866201-A
Country	US
Kind code	B2
Filing date	May 4, 2020
Priority date	Nov 5, 2018
Publication date	Aug 23, 2022
Grant date	Aug 23, 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 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; and
the layer has an average surface height of greater than 0.3 mm.

2. The filter media of claim 1 , wherein the layer is a meltblown fiber web.

3. The filter media of claim 1 , wherein the layer is a non-woven fiber web.

4. The filter media of claim 3 , wherein the filter media has an air permeability of greater than or equal to 20 CFM.

5. The filter media of claim 3 , wherein the non-woven fiber web has an air permeability of greater than or equal to 2 CFM.

6. The filter media of claim 3 , wherein the filter media has a gamma of greater than or equal to 15, and wherein the gamma is defined as (−log 10 (initial penetration %/100)/initial pressure drop, mm H 2 O)×100.

7. The filter media of claim 3 , wherein the layer is charged.

8. The filter media of claim 5 , wherein the filter media comprises a second layer that is a mesh and/or a film.

9. The filter media of claim 5 , wherein the filter media comprises a second layer that is capable of undergoing a reversible stretch of at least 50% along at least one axis.

10. The filter media of claim 5 , wherein the filter media comprises a second layer that is an electrospun fiber web.

11. The filter media of claim 10 , wherein the filter media comprises a third layer, and wherein the second layer and the third layer are positioned on opposite sides of the layer.

12. The filter media of claim 5 , wherein the filter media comprises a support layer that holds the layer in a waved configuration and maintains separation of peaks and troughs of adjacent waves of the layer.

13. The filter media of claim 5 , wherein the filter media comprises a second layer that comprises fibers and/or strands.

14. The filter media of claim 13 wherein the fibers and/or strands comprise an elastomer.

15. The filter media of claim 13 , wherein the strands are not in direct contact with each other.

16. The filter media of claim 5 , wherein the layer is carded.

17. The filter media of claim 5 , wherein the layer comprises dryspun acrylic fibers.

18. The filter media of claim 5 , wherein the layer comprises poly(propylene) fibers.

19. The filter media of claim 5 , wherein the layer comprises acrylic fibers and poly(propylene) fibers, and wherein a weight ratio of the acrylic fibers to the poly(propylene) fibers is greater than or equal to 30:70 and less than or equal to 70:30.

20. The filter media of claim 3 , wherein the layer is triboelectrically charged.

21. The filter media of claim 3 , wherein the filter media has a hydraulic gamma of greater than or equal to 15.

22. The filter media of claim 5 , wherein the filter media has a dust holding capacity of greater than or equal to 50 g/m 2 as determined by a Multipass Filter Test based on ISO 16889 (2008).

23. The filter media of claim 5 , wherein the layer is impregnated with a binder.

24. The filter media of claim 5 , wherein the filter media comprises a second layer and a third layer, wherein the second layer is laminated to the third layer, and wherein the third layer prevents the second layer from being capable of undergoing a reversible stretch.

Assignees

• Hollingsworth & Vose Co

Inventors

• Smith Bruce
• Hassan Mohammad A
• Silin Maxim
• Jinka Sudheer
• Farell Greg Wagner
• Healey David T

Classifications

• B01D39/1623 Primary

  of synthetic origin · CPC title

• B01D2239/0695

  Wound layers · CPC title

• B01D2239/0631

  Electro-spun · CPC title

• B01D2239/0435

  Electret · CPC title

• B01D2239/0654

  Support layers · CPC title