Flutable fiber webs with high dust holding capacity
The fiber webs described herein may be incorporated into filter media and filter elements. The fiber webs may exhibit a high dust holding capacity. The fiber webs may also exhibit a low thickness. The fiber webs may be sufficiently flexible and/or deformable so that they may be processed to include a series of waves (also known as flutes) that extend along the cross-machine direction.
1. A fiber web having
a dust holding capacity of greater than about 3 mg/cm 2 , wherein the dust holding capacity is measured by Palas filtration performance according to ISO Procedure 5011:2000 when a pressure drop across the fiber web reaches 1,500 Pa with a test face velocity of 20.0 cm/sec and using SAE fine dust at a dust mass concentration of 200.0 mg/m 3 ;
a basis weight between 30 g/m 2 and about 100 g/m 2 ; and
a machine direction tensile elongation of greater than about 3%.
2. The fiber web of claim 1 , wherein the fiber web has a dust holding capacity of between about 3 mg/cm 2 and about 8 mg/cm 2 .
3. The fiber web of claim 1 , wherein the fiber web has a thickness of less than 30 mils.
4. The fiber web of claim 1 , wherein the fiber web has a thickness of between about 5 mils and about 15 mils.
5. The fiber web of claim 1 , wherein the principal fiber type in the fiber web is synthetic fibers.
6. The fiber web of claim 1 , wherein the fiber web includes a resin formulation.
7. The fiber web of claim 6 , wherein the resin formulation comprises between about 1% and about 50% by weight of the fiber web.
8. The fiber web of claim 6 , wherein the resin formulation is cross-linked.
9. The fiber web of claim 1 , wherein the fiber web has a tensile elongation in the cross-machine direction of greater than about 2%.
10. The fiber web of claim 1 , wherein the fiber web has a tensile elongation in the cross-machine direction is between about 2% and about 15%.
11. The fiber web of claim 1 , wherein the fiber web has a basis weight between 60 g/m 2 and about 80 g/m 2 .
12. The fiber web of claim 1 , wherein the fiber web has a permeability of between about 5 cfm/sf and about 200 cfm/sf.
13. The fiber web of claim 1 , wherein the fiber web has a machine direction tensile elongation of between about 3% and about 8%.
14. The fiber web of claim 1 , wherein the fiber web has a machine direction tensile elongation of between about 3% and about 5%.
15. The fiber web of claim 14 , wherein the fiber web has a dust holding capacity of between about 3 mg/cm 2 and about 8 mg/cm 2 .
16. The fiber web of claim 14 , wherein the fiber web has a thickness of less than 30 mils.
17. The fiber web of claim 14 , wherein the fiber web has a thickness of between about 5 mils and about 15 mils.
18. The fiber web of claim 14 , wherein the principal fiber type in the fiber web is synthetic fibers.
19. The fiber web of claim 14 , wherein the fiber web has a tensile elongation in the cross-machine direction of greater than about 2%.
20. The fiber web of claim 14 , wherein the fiber web has a tensile elongation in the cross-machine direction is between about 2% and about 15%.
21. The fiber web of claim 14 , wherein the fiber web has a basis weight between 60 g/m 2 and about 80 g/m 2 .
22. The fiber web of claim 14 , wherein the fiber web has a permeability of between about 5 cfm/sf and about 200 cfm/sf.
23. A filter element comprising the fiber web of claim 1 .