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.

Filter media (100) for dewatering slurry is disclosed. The filter media (100) may comprise a filtering body (105) comprising non-occluded porous material (105a) and occluded porous material (105b). At least one upper tab (101) comprising at least one upper locking element (102) and at least one lower tab (104) comprising at least one lower locking element (103) may be provided to the filter media (100) as means for attaching the filter media (100) to a filter plate (300). The filter plate (300) may comprise at least one upper locking element (302) provided to an upper end surface (301) of the filter plate (300) and at least one lower locking element (303) provided to a lower end surface (304) of the filter plate (300); wherein the at least one upper tab (101) of the filter media (100) is configured to communicate with the at least one upper locking element (302) of the filter plate (300) and wherein the at least one lower tab (104) of the filter media (100) is configured to communicate with the at least one lower locking element (303) at the lower end surface (304) of the filter plate (300). A method of manufacturing the filter media is also described.

A non-woven fabric body (11) that forms a non-woven fabric (1) is formed by integrating composite polyester fibers (2) and flame-retardant acrylic fibers (3) which serve as the other fibers of the rest. The composite polyester fibers (2) have a core-sheath structure in which a sheath portion (4) is formed of a low melting point polyester and a core portion (5) is formed of a high melting point polyester having a higher melting point than that of the low melting point polyester. The composite polyester fibers (2) are contained in an amount of 15% to 80% by weight in a total of 100% by weight of the non-woven fabric body (11). Further, an apparent density of the non-woven fabric body (11) ((a basis weight of the non-woven fabric body)/(a thickness of the non-woven fabric body)) is 0.005 g/cm.sup.3 to 0.040 g/cm.sup.3. In addition, a bending resistance of the non-woven fabric body (11) in a flow direction of the fibers is 50 mN.Math.cm to 220 mN.Math.cm, and a bending resistance in a width direction that is orthogonal to the flow direction is 20 mN.Math.cm to 140 mN.Math.cm.

Fibrous filter medium that includes a surface-loading filter layer comprising fine fibers having an average diameter of less than 1 micron; a depth loading filter layer; and a support layer; wherein the layers are configured and arranged for placement in a gas stream with the surface loading filter layer being the most upstream layer.

Fibrous filter medium that includes a surface-loading filter layer comprising fine fibers having an average diameter of less than 1 micron; a depth loading filter layer; and a support layer; wherein the layers are configured and arranged for placement in a gas stream with the surface loading filter layer being the most upstream layer.

A method for producing a 3D sponge based on nanofibers includes the processing steps of producing nanofiber based material, cutting the nanofiber based material in small pieces, suspending the small pieces into a wetting non-dissolving liquid, homogenizing the suspension to obtain a slurry with separated short nanofibers, freezing the slurry at a controlled rate and generating a solid templated 3D network of short nanofibers, and thermally, physically or chemically cross-linking the short nanofibers to improve the mechanical stability of the produced sponge.

The present disclosure relates generally to improved room air purifiers and filtration media for use in room air purifiers. In some embodiments, the room air purifiers and media exhibit excellent filtration of cigarette smoke and/or formaldehyde. Some embodiments include a multilayer filtration media, comprising: a fluorinated electret layer; a sorbent layer adjacent to the fluorinated electret layer; and an optional backing layer having a Gurley stiffness of at least about 200 mg; where the backing layer is not present, at least one of the fluorinated electret layer, the sorbent layer, or the combination of the two layers has a Gurley stiffness of at least about 200 mg. In some embodiments, the filtration media is pleated.

Filter media comprising non-woven fiber webs having high performance are generally described. For instance, in some embodiments, a non-woven fiber web described herein has a relatively high value of gamma and/or a relatively high ratio of dust holding capacity to basis weight. As another example, in some embodiments, a non-woven fiber web described herein is capable of being loaded with dust relatively uniformly throughout its depth. This latter property may assist with increasing the gamma and/or the ratio of dust holding capacity to basis weight.

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.

Articles and methods relating to filter media are generally provided. In some embodiments, a filter media has an irregular surface structure. For instance, the filter media may comprise a plurality of peaks that are irregular in one or more ways. A ratio of a peak height standard deviation to an average peak height may be greater than or equal to 0.05, and/or a ratio of a peak spacing standard deviation to an average peak spacing may be greater than or equal to 0.08. In some embodiments, a filter media comprises a non-woven fiber web having a layer thickness of greater than 0.3 mm and/or a stiffness of less than or equal to 100 mg.