Charged polymeric webs, such as electret webs, include a thermoplastic resin and a charge-enhancing additive. The charge-enhancing additive is a substituted-benzimidazole compound. The electret webs may be a non-woven fibrous web or a film. The electret webs are suitable for use as filter media.

Methods of producing composite articles and composite articles are disclosed herein. A method of producing a composite article includes providing a nonwoven fabric substrate having a surface. In some embodiments, the method may include electrospinning a nylon solution on the surface of the nonwoven fabric substrate to coat and/or impregnate the nonwoven fabric substrate with a nylon fiber.

Methods of producing composite articles and composite articles are disclosed herein. A method of producing a composite article includes providing a nonwoven fabric substrate having a surface. In some embodiments, the method may include electrospinning a nylon solution on the surface of the nonwoven fabric substrate to coat and/or impregnate the nonwoven fabric substrate with a nylon fiber.

Charged polymeric webs, such as electret webs, include a thermoplastic resin and a charge-enhancing additive. The charge-enhancing additive is a dual-function charge-enhancing additive that enhances the charge of the electret and also has anti-microbial properties. The additives are substituted-benzimidazole or substituted-benzothiazole compounds. The electret webs may be a non-woven fibrous web or a film. The electret webs are suitable for use as filter media.

A fiber assembly includes, on a main surface of a support sheet subjected to a release treatment, a warp yarn group in which a plurality of warp yarns including a polymer material are arranged, and a weft yarn group in which a plurality of weft yarns including a polymer material are arranged. The warp yarn group and the weft yarn group form a plurality of first contact portion regions and a plurality of non-contact portion regions. Each of the plurality of first contact portion regions is a region in which at least one of the plurality of warp yarns is integrated with at least one of the plurality of weft yarns. Each of the plurality of warp yarns has a line width of 1 μm to 10 μm, inclusive, and each of the plurality of weft yarns has a line width of 1 μm to 10 μm, inclusive. At least one of the plurality of first contact portion regions has a fiber density higher than that of at least one of the plurality of non-contact portion regions. Two of the plurality of warp yarns or two of the plurality of weft yarns have a spacing of 5 μm or more and 1000 μm or less in at least one of the plurality of first contact portion regions. Two of the plurality of warp yarns or two of the plurality of weft yarns have a spacing of 2000 μm or more in at least one of the plurality of non-contact portion regions.

A fiber assembly includes, on a main surface of a support sheet subjected to a release treatment, a warp yarn group in which a plurality of warp yarns including a polymer material are arranged, and a weft yarn group in which a plurality of weft yarns including a polymer material are arranged. The warp yarn group and the weft yarn group form a plurality of first contact portion regions and a plurality of non-contact portion regions. Each of the plurality of first contact portion regions is a region in which at least one of the plurality of warp yarns is integrated with at least one of the plurality of weft yarns. Each of the plurality of warp yarns has a line width of 1 μm to 10 μm, inclusive, and each of the plurality of weft yarns has a line width of 1 μm to 10 μm, inclusive. At least one of the plurality of first contact portion regions has a fiber density higher than that of at least one of the plurality of non-contact portion regions. Two of the plurality of warp yarns or two of the plurality of weft yarns have a spacing of 5 μm or more and 1000 μm or less in at least one of the plurality of first contact portion regions. Two of the plurality of warp yarns or two of the plurality of weft yarns have a spacing of 2000 μm or more in at least one of the plurality of non-contact portion regions.

A method for making an absorbent article comprising an absorbent core comprising one or more channels, the method comprising the steps of: i. providing a first endless moving surface comprising a plurality of molds typically in the form of pockets, each mold comprising an insert therein, wherein the molds are in fluid communication with an under-pressure source except for said insert such that a suction zone is formed in areas neighboring said insert; ii. feeding a first nonwoven web to said first endless moving surface and over one or more said molds; iii. depositing an absorbent material, comprising cellulose fibers and/or superabsorbent polymer particles, over at least a portion of said nonwoven web; iv. optionally further selectively removing said absorbent material from areas of the nonwoven web corresponding to said insert; v. applying a second nonwoven web directly or indirectly over the absorbent material, or folding said first nonwoven web, such to sandwich said absorbent material between upper and lower layers of said nonwoven web(s); vi. joining said upper and lower layers together at least in the areas of the nonwoven web(s) corresponding to the insert to form an absorbent core having one or more channels substantially free of absorbent material; vii. optionally joining an acquisition distribution layer to said absorbent core, typically a skin facing surface of said upper layer; viii. optionally laminating said absorbent core and acquisition distribution layer between a liquid pervious topsheet and a liquid impervious backsheet; wherein at least a portion of said insert is porous and is in fluid communication with a positive pressure source such that air is blown out of said insert to form an air cushion or air film around at least an uppermost surface of said insert and in that said absorbent material is thereby forced away from areas of the nonwoven web corresponding to said insert.

The invention relates to a water-repellent and lipophilic composite needle-punched nonwoven fabric and a preparation method thereof. The method comprises the following steps: blending a PET fiber and a polyolefin-based fiber in a mass ratio of 3:1-1:3, and performing needle punching to obtain a composite needle-punched nonwoven fabric; carrying out hot-drying treatment on the composite needle-punched nonwoven fabric at 110-160° C. for 40-90 min; and carrying out water-repellent finishing on the hot-dried fabric using 50-70 mL/L of an aqueous solution of a modified resin-based fluorine-free waterproofing agent, and drying to obtain the water-repellent and lipophilic composite needle-punched nonwoven fabric, wherein the water-repellent finishing is dip rolling, the air pressure is 1.8 kPa and the liquid carrying rate is 160-230%. The preparation method of the invention is simple, and the prepared composite needle-punched nonwoven fabric has significantly improved water repellency, lipophilicity and tensile strength compared with the fabric before treatment.

The invention relates to a water-repellent and lipophilic composite needle-punched nonwoven fabric and a preparation method thereof. The method comprises the following steps: blending a PET fiber and a polyolefin-based fiber in a mass ratio of 3:1-1:3, and performing needle punching to obtain a composite needle-punched nonwoven fabric; carrying out hot-drying treatment on the composite needle-punched nonwoven fabric at 110-160° C. for 40-90 min; and carrying out water-repellent finishing on the hot-dried fabric using 50-70 mL/L of an aqueous solution of a modified resin-based fluorine-free waterproofing agent, and drying to obtain the water-repellent and lipophilic composite needle-punched nonwoven fabric, wherein the water-repellent finishing is dip rolling, the air pressure is 1.8 kPa and the liquid carrying rate is 160-230%. The preparation method of the invention is simple, and the prepared composite needle-punched nonwoven fabric has significantly improved water repellency, lipophilicity and tensile strength compared with the fabric before treatment.

A spun-blown non-woven web is disclosed which is formed from a plurality of fibers formed from a single polymer having an average fiber diameter ranging from between about 0.5 microns to about 50 microns; a basis weight of at least about 0.5 gsm; a tensile strength, measured in a machine direction, ranging from between about 20 g to about 4,200 g; a ratio of tensile strength, measured in the machine direction, to basis weight of at least about 20:1; and a ratio of percent elongation, measured in the machine direction, to fiber diameter of at least about 15.