FILTER MEDIA COMPRISING A NON-WETLAID BACKER
Filter media comprising a non-wetlaid backer are generally provided. In some embodiments, a filter media comprises a non-wetlaid fiber web and further comprises one or more further fiber webs. The further fiber web(s) may include an efficiency layer and/or a prefilter.
1 . A filter media, comprising:
a first fiber web, wherein the first fiber web is a non-wetlaid fiber web, and wherein the first fiber web comprises a resin;
a second fiber web, wherein the second fiber web comprises fibers having an average diameter of greater than or equal to 0.01 micron and less than or equal to 1 micron; and
a third fiber web, wherein the third fiber web comprises fibers having an average diameter of greater than or equal to 0.8 microns and less than or equal to 8 microns,
wherein a ratio of a machine direction tensile strength of the filter media to a cross direction tensile strength of the filter media is greater than or equal to 2 and less than or equal to 10.
2 . A filter media, comprising:
a first fiber web, wherein the first fiber web is a non-wetlaid fiber web, and wherein the first fiber web comprises a resin;
a second fiber web, wherein the second fiber web comprises fibers having an average diameter of greater than or equal to 0.01 micron and less than or equal to 1 micron; and
a third fiber web, wherein the third fiber web comprises fibers having an average diameter of greater than or equal to 0.8 microns and less than or equal to 8 microns,
wherein the filter media has an “F” classification of F1 and/or has a “K” classification of K1.
3 . A filter media, comprising:
a first fiber web, wherein the first fiber web is a non-wetlaid fiber web, wherein the first fiber web comprises fibers, wherein the first fiber web comprises a resin, wherein both the fibers and the resin each comprise a poly(ester), and wherein the poly(ester) in the fibers and the poly(ester) in the resin together make up greater than or equal to 50 wt % and less than or equal to 100 wt % of the first fiber web;
a second fiber web, wherein the second fiber web comprises fibers having an average diameter of greater than or equal to 0.01 micron and less than or equal to 1 micron; and
a third fiber web, wherein the third fiber web comprises fibers having an average diameter of greater than or equal to 0.8 microns and less than or equal to 8 microns.
4 - 7 . (canceled)
8 . A filter media as in claim 1 , wherein an adhesive is positioned between the first fiber web and the second fiber web.
9 . (canceled)
10 . A filter media as in claim 1 , wherein an adhesive is positioned between the second fiber web and the third fiber web.
11 . (canceled)
12 . A filter media as in claim 1 , wherein an adhesive is positioned between the first fiber web and the third fiber web.
13 - 14 . (canceled)
15 . A filter media as in claim 1 , wherein the first fiber web comprises staple fibers.
16 . A filter media as in claim 1 , wherein greater than or equal to 50% of the staple fibers have a length of greater than or equal to 1 in and less than or equal to 4 in.
17 . A filter media as in claim 1 , wherein greater than or equal to 70% of the staple fibers have a length of greater than or equal to 1 in and less than or equal to 4 in.
18 . (canceled)
19 . A filter media as in claim 1 , wherein the first fiber web comprises crimped fibers.
20 - 63 . (canceled)
64 . A filter media as in claim 1 , wherein the first fiber web comprises multicomponent fibers.
65 . A filter media as in claim 64 , wherein the multicomponent fibers are bicomponent fibers.
66 . A filter media as in claim 64 , wherein the multicomponent fibers make up greater than or equal to 10 wt % of the first fiber web.
67 . A filter media as in claim 64 , wherein the multicomponent fibers make up greater than or equal to 30 wt % of the first fiber web.
68 . A filter media as in claim 64 , wherein the multicomponent fibers make up greater than or equal to 50 wt % of the first fiber web.
69 . A filter media as in claim 1 , wherein the first fiber web is a carded fiber web.
70 . A filter media as in claim 1 , wherein the second fiber web is an electrospun fiber web.
71 . A filter media as in claim 1 , wherein the third fiber web is a meltblown fiber web.
72 . A filter media as in claim 1 , wherein 100 wt % of the filter media is made up of synthetic material.
73 . A filter media as in claim 1 , wherein bicomponent fibers make up greater than or equal to 70 wt % and less than or equal to 90 wt % of the first fiber web, monocomponent fibers make up greater than or equal to 10 wt % and less than or equal to 30 wt % of the first fiber web, and a resin makes up greater than or equal to 10 wt % and less than or equal to 30 wt % of the first fiber web.