Depth filtration media with multiple organic and/or inorganic materials
A method of making depth filtration media, such as for use in a depth filter, are described. The resulting depth filtration media includes a core tube having two or more different layers. The layers can be fibers, such as polymeric or inorganic fibers, wrapped layers of a filter material, or pleated and folded layers of a filter material.
1. A depth filtration media having a plurality of layers, comprising:
a) a core tube;
b) a non-woven layer of a first filter material comprising polymeric fibers melt-blown atop the core tube, wherein a diameter of the polymeric fibers is in a range from about 0.3 micron to about 10 microns; and
c) a layer of a second filter material over the layer of first filter material, the first and second filter materials being different.
2. The depth filtration media of claim 1 , further comprising:
d) a layer of a third filter material over the layer of second filter material.
3. The depth filtration media of claim 2 , wherein one or more of the second layer or the third layer is wrapped, pleated, or melt-blown.
4. A multilayer depth filtration media comprising:
a) a non-woven layer of polymeric melt-blown fibers, the polymeric melt-blown fibers have a diameter that range from about 0.3 micron to about 10 microns, the polymeric melt-blown fibers form a layer atop a liquid permeable core, the layer has a thickness between about 1 millimeter and about 20 millimeters;
b) a non-woven microporous filter membrane overlying the melt-blown polymeric fibers atop the core, the microporous filter membrane has pores with a size of between about 0.2 microns and about 1.4 microns and the thickness of the filter membrane can be between about 20 microns and about 1000 microns; and
c) a non-woven layer of polymeric fibers melt-blown atop the non-woven microporous filter membrane, the polymeric fibers in this layer atop the microporous filter membrane have a diameter of from about 0.3 micron to about 10 microns, said layer has a thickness between about 1 millimeter and about 20 millimeters.
5. The depth filtration media of claim 4 wherein the non-woven filter membrane material is chosen from the group consisting of a glass, a polyether sulfone, nylon.
6. The depth filtration media of claim 4 wherein one wrapped layer is a pleated membrane.
7. A depth filter, comprising:
a) the depth filtration media of claim 4 ; and
b) end caps bonded to opposing ends of the depth filtration media.
8. A method of making depth filtration media having a plurality of layers, comprising:
a) providing a core tube;
b) melt-blowing a first filter material comprising polymeric fibers atop the core tube, wherein a diameter of the polymeric fibers is in a range from about 0.3 micron to about 10 microns; and
c) layering a second filter material over the first filter material, the first and second filter materials being different;
thereby forming a depth filtration media.
9. The method of claim 8 , further comprising layering a third filter material over the second filter material.
10. The method of claim 9 , wherein layering the second or the third layer is performed by melt-blowing.
11. The method of claim 9 , wherein layering the second or the third layer is performed by layering a pleated filter material.
12. The method of claim 11 , wherein the pleated filter material is a composite filter material.
13. The method of claim 9 , wherein layering the second or the third layer is performed by wrapping a filter material.
14. The method of claim 13 , wherein the filter material is a composite filter material.
15. The method of claim 8 , wherein the first filter material is polypropylene that is layered by melt-blowing.
16. The method of claim 15 , wherein the second filter material is polyamide, polyether sulfone, or glass fibers that is layered by wrapping.
17. The method of claim 16 , further comprising layering a third filter material, wherein the third material is polypropylene that is layered by melt-blowing.
18. The method of claim 8 , further comprising cutting the depth filtration media.
19. The method of claim 8 , wherein one or more of the first, second, and third filter materials are polyethylene, polypropylene, cellulose, acetate, polyesters, polyamides, polytetrafluoroethylene, fluoropolymers, or glass fibers.
20. A depth filter, comprising:
a) filtration media comprising a core tube, a non-woven layer of first filter material comprising polymeric fibers melt-blown atop the core tube, wherein a diameter of the polymeric fibers is in a range from about 0.3 micron to about 10 microns, and a layer of second filter material over the layer of first filter material, the first and second filter materials being different; and
b) end caps bonded to opposing ends of the filtration media.