Pre-coalescing multi-layered filter media
First Claim
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1. A filter media, comprising:
- a first layer comprising a first plurality of fibers, wherein the first layer has a first mean flow pore size;
a second layer comprising a second plurality of fibers having an average fiber diameter of less than or equal to about 2 microns, wherein the second layer has a second mean flow pore size, and wherein a surface of the second layer is modified to be hydrophilic; and
a third layer comprising a third plurality of fibers, wherein the third layer has a third mean flow pore size,wherein each of the first and third mean flow pore sizes is higher than the second mean flow pore size, andwherein the second layer is positioned between the first and third layers.
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Abstract
Fiber webs that may be used as filter media are provided. In some embodiments, the filter media may include multiple layers. Each layer may be designed to have separate functions in the filter media. For example, a first layer may be provided for improving dust holding capacity, a second layer for improving efficiency, and a third layer for providing support and strength to the media. By designing the layers to have separate functions, each layer may be optimized to enhance its function without negatively impacting the performance of another layer of the media.
177 Citations
62 Claims
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1. A filter media, comprising:
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a first layer comprising a first plurality of fibers, wherein the first layer has a first mean flow pore size; a second layer comprising a second plurality of fibers having an average fiber diameter of less than or equal to about 2 microns, wherein the second layer has a second mean flow pore size, and wherein a surface of the second layer is modified to be hydrophilic; and a third layer comprising a third plurality of fibers, wherein the third layer has a third mean flow pore size, wherein each of the first and third mean flow pore sizes is higher than the second mean flow pore size, and wherein the second layer is positioned between the first and third layers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A filter media, comprising:
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a first layer comprising a first plurality of fibers, wherein the first layer has a first mean flow pore size; a second layer comprising a second plurality of fibers having an average fiber diameter of less than or equal to about 2 microns, wherein the second layer has a second mean flow pore size, wherein a surface of the second layer is modified to be hydrophilic or hydrophobic, and wherein the second plurality of fibers comprise microfibrillated cellulose fibers; and a third layer comprising a third plurality of fibers, wherein the third layer has a third mean flow pore size, wherein each of the first and third mean flow pore sizes is higher than the second mean flow pore size, and wherein the second layer is positioned between the first and third layers.
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23. A filter media, comprising:
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a first layer comprising a first plurality of fibers, wherein the first layer has a first mean flow pore size; a second layer comprising a second plurality of fibers having an average fiber diameter of less than or equal to about 2 microns, wherein the second layer has a second mean flow pore size, and wherein a surface of the second layer is modified to be hydrophilic or hydrophobic; and a third layer comprising a third plurality of fibers, wherein the third layer has a third mean flow pore size, wherein the third layer comprises a plurality of perforations, wherein each of the first and third mean flow pore sizes is higher than the second mean flow pore size, and wherein the second layer is positioned between the first and third layers. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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44. A filter media, comprising:
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a first layer comprising a first plurality of fibers, wherein the first layer has a first mean flow pore size; a second layer comprising a second plurality of fibers having an average fiber diameter of less than or equal to about 2 microns, wherein the second plurality of fibers comprise microfibrillated cellulose fibers, wherein the second layer has a second mean flow pore size, and wherein a surface of the second layer is modified to be hydrophilic or hydrophobic and comprises a chemical vapor deposition coating; and a third layer comprising a third plurality of fibers, wherein the third layer has a third mean flow pore size, wherein each of the first and third mean flow pore sizes is higher than the second mean flow pore size, and wherein the second layer is positioned between the first and third layers. - View Dependent Claims (45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62)
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Specification