07-01-2021 дата публикации
Номер: US20210001263A1
Filter media, filter elements, and methods for filtering an gas stream are described herein. In some embodiments, the filter media may comprise a fiber web comprising a plurality of fibers and having a particular oil repellency level. For instance, in certain embodiments, the surface chemistry of the fiber web may be tailored to impart a particular surface energy density that matches the surface energy density of the fluid (e.g., an oil, a lubricant, and/or a cooling agent) being removed from the gas stream. In some embodiments, the fiber web may be wrapped around a core. For example, the fiber web may be wrapped around the core such that it forms two or more layers around the core. In some cases, the fiber web may be perforated. In certain embodiments, an gas stream comprising a fluid (e.g., an oil, a lubricant, and/or a cooling agent) may be passed through the fiber web, filter media, and/or filter element such that at least a portion of the fluid coalesces on the fiber web. Fiber webs, filter media, and/or filter elements as described herein may be particularly well-suited for applications that involve filtering gas streams containing oil, lubricants, and/or cooling agents (e.g., gas streams generated by a compressor) though the media may also be used in other applications. Advantageously, the fiber webs, filter media, and/or filter elements described herein may significantly reduce or prevent fouling of the filter caused by oil or other liquids. 1passing the gas stream including the oil, lubricant, and/or cooling agent through a filter element, wherein the filter element comprises a fiber web wrapped around a core such that at least two layers of the fiber web are formed, the fiber web comprising:a plurality of fibers having an average fiber diameter of at least 0.01 microns and less than or equal to 50 microns;{'sup': 2', '2, 'a basis weight of at least 1 g/mand less than or equal to 270 g/m; and'}a thickness of at least 0.01 mm and less than or equal to 5.0 mm ...
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