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公开(公告)号：US20210291094A1
公开(公告)日：2021-09-23
申请号：US17137959
申请日：2020-12-30
IPC分类号： B01D39/16 , B32B5/02 , B32B5/26 , B32B7/12 , C09J133/08
摘要： Articles and methods involving filter media are generally provided. In certain embodiments, the filter media includes at least a first layer, a second layer, and an adhesive resin positioned between the first layer and the second layer. In some embodiments, the first layer may be a pre-filter layer or a support layer. The second layer may, for example, comprise fibers formed by a solution spinning process and/or may comprise fine fibers. In some embodiments, the adhesive resin may be present in a relatively low amount and/or may have a low glass transition temperature. The filter media as a whole may have one or more advantageous properties, including one or more of a high stiffness, a high bond strength between the first layer and the second layer, a high gamma, and/or a low increase in air resistance after being subjected to an IPA vapor discharge. The filter media may be, for example, a HEPA filter and/or an ULPA filter.
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公开(公告)号：US11077394B2
公开(公告)日：2021-08-03
申请号：US15438042
申请日：2017-02-21
发明人： Bruce Smith
摘要： Filter media, such as electret-containing filtration media for filtering gas streams (e.g., air), are described herein. In some embodiments, the filter media may be designed to have desirable properties such as stable filtration efficiency over the lifetime of the filter media, increased normalized gamma, relatively low pressure drop (i.e. resistance), and/or relatively low basis weight. In certain embodiments, the filter media may be a composite of two or more types of fiber layers where each layer may be designed to enhance its function without substantially negatively impacting the performance of another layer of the media. For example, one layer of the media may be designed to have a relatively low basis weight and/or a relatively high air permeability, and another layer of the media may be designed to have stable filtration efficiency and/or a relatively high efficiency throughout the filter media's lifetime. The filter media described herein may be particularly well-suited for applications that involve filtering gas streams (e.g., face masks, cabin air filtration, vacuum filtration, room filtration, furnace filtration, respirator equipment, residential or industrial HVAC filtration, high-efficiency particulate arrestance (HEPA) filters, ultra-low particular air (ULPA) filters, medical equipment), though the media may also be used in other applications.
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公开(公告)号：US20210187421A1
公开(公告)日：2021-06-24
申请号：US16721788
申请日：2019-12-19
IPC分类号： B01D39/16 , D04H1/4374 , D04H1/4391 , D04H1/58 , D04H1/732 , D04H1/435
摘要： 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.
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公开(公告)号：US20200054975A1
公开(公告)日：2020-02-20
申请号：US15999636
申请日：2018-08-20
摘要： Filter media comprising a non-woven web including one or more binder components are provided. In some embodiments, the non-woven web comprises fibers and one or more binder components (e.g., monocomponent binder fibers, binder particles). The binder component(s) may impart strength and/or durability to the non-woven web without adversely affecting one or more filtration properties (e.g., air permeability, efficiency, dust holding capacity). In such cases, the non-woven web may function as both a filtration and support layer. For instance, the non-woven web may trap particulate matter and allow the filter media to be pleated and/or utilized in a filter element without the need for additional support structures. Filter media described herein may be particularly well-suited for applications such as fuel filtration, hydraulic filtration, lube filtration, gas turbine filtration, air filtration, and water filtration, though the media may also be used in other applications.
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公开(公告)号：US10543441B2
公开(公告)日：2020-01-28
申请号：US15471284
申请日：2017-03-28
摘要： Articles and methods involving filter media are generally provided. In certain embodiments, the filter media includes at least a first layer, a second layer, and an adhesive resin positioned between the first layer and the second layer. In some embodiments, the first layer may be a pre-filter layer or a support layer. The second layer may, for example, comprise fibers formed by a solution spinning process and/or may comprise fine fibers. In some embodiments, the adhesive resin may be present in a relatively low amount and/or may have a low glass transition temperature. The filter media as a whole may have one or more advantageous properties, including one or more of a high stiffness, a high bond strength between the first layer and the second layer, a high gamma, and/or a low increase in air resistance after being subjected to an IPA vapor discharge. The filter media may be, for example, a HEPA filter and/or an ULPA filter.
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公开(公告)号：US20190388847A1
公开(公告)日：2019-12-26
申请号：US16398776
申请日：2019-04-30
发明人： Howard Yu , Sneha Swaminathan
摘要： Fiber webs which are used in filter media are described herein. In some embodiments, the fiber webs include fibrillated fibers and optionally non-fibrillated fibers, amongst other optional components (e.g., binder resin). In some embodiments, the fiber webs include limited amounts of, or no, glass fiber. The respective characteristics and amounts of the fibrillated fibers are selected to impart desirable properties including mechanical properties and filtration properties (e.g., dust holding capacity and efficiency), amongst other benefits.
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公开(公告)号：US10449474B2
公开(公告)日：2019-10-22
申请号：US14858398
申请日：2015-09-18
发明人： Bruce Smith , David T. Healey , Ingrid Staisch
IPC分类号： B01D39/16 , A41D13/11 , A62B18/02 , A62B23/02 , B01D39/18 , B01D39/20 , B01D46/02 , B01D46/10 , B01D46/52
摘要： Filter media including a waved filtration layer are described herein. The filtration layer may be held in a waved configuration by a support layer. In some cases, the filtration layer may have a combination of characteristics (e.g., mean flow pore size, basis weight, amongst others) that can lead to enhanced filtration performance (e.g., reduced air permeability decrease), in particular, in high humidity environments. The filter media may be used to form a variety of filter elements for use in various applications.
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公开(公告)号：US10441909B2
公开(公告)日：2019-10-15
申请号：US14314121
申请日：2014-06-25
发明人： Arash Sahbaee , Bruce Smith
IPC分类号： B01D46/00 , B01D39/00 , B01D46/54 , B01D39/16 , B01D39/02 , B01D46/02 , B01D46/10 , B01D46/52
摘要： Filter media incorporating one or more filtration layers that include fibers including fiber portions orientated at a non-zero angle with respect to a surface of the filtration layer are provided. In some embodiments, at least a part of the fiber portions are positioned at an angle of at least 20 degrees (e.g., between 46 degrees and 90 degrees, or between 61 degrees and 90 degrees) with respect to a surface of the filtration layer or an outer or cover layer of the media. This orientation of fiber portions may result in an increased efficiency (e.g., average efficiency and/or initial efficiency) compared to similar filter media that do not include such oriented fiber portions.
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公开(公告)号：US10322380B2
公开(公告)日：2019-06-18
申请号：US15296085
申请日：2016-10-18
发明人： Howard Yu , Sneha Swaminathan
摘要： Fiber webs which are used in filter media are described herein. In some embodiments, the fiber webs include fibrillated fibers and optionally non-fibrillated fibers, amongst other optional components (e.g., binder resin). In some embodiments, the fiber webs include limited amounts of, or no, glass fiber. The respective characteristics and amounts of the fibrillated fibers are selected to impart desirable properties including mechanical properties and filtration properties (e.g., dust holding capacity and efficiency), amongst other benefits.
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公开(公告)号：US10195542B2
公开(公告)日：2019-02-05
申请号：US14279190
申请日：2014-05-15
发明人： Sneha Swaminathan , Howard Yu
摘要： Surface modified filter media, including surface modified filter media having enhanced performance characteristics, are provided. In some embodiments, a filter media may comprise two or more layers designed to enhance fluid separation efficiency. One or more of the layers may have at least a portion of a surface that is modified to alter and/or enhance the wettability of the surface with respect to a particular fluid. In certain embodiments involving a filter media including more than one surface modified layer, at least one surface modified layer may have a greater air permeability and/or mean flow pore size than that of another surface modified layer. Such a configuration of layers may result in the media having enhanced fluid separation properties compared to filter media that do not include such modified layers or configuration of layers, all other factors being equal. The filter media may be well-suited for a variety of applications, including filtering fuel, air, and lube oil.
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