Nanofiber filter media ribbons are flexible elongate strips of polymeric material having a surface on which is formed an array of nanofibers. Ribbons are formable into woven or non-woven mats. The array of nanofibers can be configured to filter a predetermined contaminant from a fluid stream passing through the mats. Filter ribbons are formable by applying a moldable polymer to a first angular location of a rotating cylindrical roll having an array of nanoholes formed in a circumferential surface thereof so that the polymer covers the surface of the roll and infiltrates the nanoholes; cooling the polymer while rotating the polymer-covered roll to a second angular position; and removing the cooled polymer from the roll as an elongate film having an array of nanofibers formed on a surface thereof by the polymer that infiltrated the nanoholes.

A multi-laminar electrospun nanofiber scaffold for use in repairing a defect in a tissue substrate is provided. The scaffold includes a first layer formed by a first plurality of electrospun polymeric fibers, and a second layer formed by a second plurality of electrospun polymeric fibers. The second layer is combined with the first layer. A first portion of the scaffold includes a higher density of fibers than a second portion of the scaffold, and the first portion has a higher tensile strength than the second portion. The scaffold is configured to degrade via hydrolysis after at least one of a predetermined time or an environmental condition. The scaffold is configured to be applied to the tissue substrate containing the defect, and is sufficiently flexible to facilitate application of the scaffold to uneven surfaces of the tissue substrate, and to enable movement of the scaffold by the tissue substrate.

A multi-laminar electrospun nanofiber scaffold for use in repairing a defect in a tissue substrate is provided. The scaffold includes a first layer formed by a first plurality of electrospun polymeric fibers, and a second layer formed by a second plurality of electrospun polymeric fibers. The second layer is combined with the first layer. A first portion of the scaffold includes a higher density of fibers than a second portion of the scaffold, and the first portion has a higher tensile strength than the second portion. The scaffold is configured to degrade via hydrolysis after at least one of a predetermined time or an environmental condition. The scaffold is configured to be applied to the tissue substrate containing the defect, and is sufficiently flexible to facilitate application of the scaffold to uneven surfaces of the tissue substrate, and to enable movement of the scaffold by the tissue substrate.

A nonwoven composite fabric including a first nonwoven layer composed substantially of meltblown fibers, the fibers within the first nonwoven layer having diameters that vary in accordance with a first distribution, a second nonwoven layer composed substantially of meltblown fibers, the fibers within the second nonwoven layer having diameters that vary in accordance with a second distribution, and a third nonwoven layer composed substantially of meltblown fibers, the third nonwoven layer disposed between the first and second nonwoven layers, the fibers within the third nonwoven layer having diameters that vary in accordance with a third distribution that is greater than the first and second distributions.

The present disclosure relates to a method for preparing a non-woven fabric which improves impregnation and release properties of a fabric softener in the non-woven fabric in order to apply the non-woven fabric to a dryer sheet (sheet-type fabric softener). When increasing porosity and specific surface area in a non-woven fabric made of two-component blended polyester long fibers, impregnation and release rate of a fabric softener are improved even when the non-woven fabric is lightened, making it possible to apply the non-woven fabric to a dryer sheet.

The present disclosure relates to a method for preparing a non-woven fabric which improves impregnation and release properties of a fabric softener in the non-woven fabric in order to apply the non-woven fabric to a dryer sheet (sheet-type fabric softener). When increasing porosity and specific surface area in a non-woven fabric made of two-component blended polyester long fibers, impregnation and release rate of a fabric softener are improved even when the non-woven fabric is lightened, making it possible to apply the non-woven fabric to a dryer sheet.

A polylactic acid nano-fiber membrane and preparation method thereof. In particular, the membrane has PLA nanofibers with an average diameter between 50 nm and 200 nm, wherein the nanofibers contain a crystal phase with a volume fraction between 45% and 85% and the crystal phase contains PLA stereocomplex crystals with a volume fraction between 85% and 95%. The method of preparation includes mixing dried PDLA and PLLA in a specific PLLA/PDLA ratio of between 95/5 and 99/1; producing continuous fibers or nonwovens in a extrusion and spinning device, and producing woven fabrics or nonwovens with the continuous fibers; heat treating the woven fabrics or nonwovens; washing the heat treated woven fabrics or nonwovens with a solvent; removing the solvent and drying the woven fabrics or nonwovens; and pressing the dried woven fabrics or nonwovens for making the membrane.

A polylactic acid nano-fiber membrane and preparation method thereof. In particular, the membrane has PLA nanofibers with an average diameter between 50 nm and 200 nm, wherein the nanofibers contain a crystal phase with a volume fraction between 45% and 85% and the crystal phase contains PLA stereocomplex crystals with a volume fraction between 85% and 95%. The method of preparation includes mixing dried PDLA and PLLA in a specific PLLA/PDLA ratio of between 95/5 and 99/1; producing continuous fibers or nonwovens in a extrusion and spinning device, and producing woven fabrics or nonwovens with the continuous fibers; heat treating the woven fabrics or nonwovens; washing the heat treated woven fabrics or nonwovens with a solvent; removing the solvent and drying the woven fabrics or nonwovens; and pressing the dried woven fabrics or nonwovens for making the membrane.

Described are fibrous materials comprising a plurality of fibers having a longitudinal alignment gradient and/or a longitudinal composition gradient. Also described are methods of preparing the fibrous materials thereof and methods of treating organ or tissue damage with the fibrous materials.

Described are fibrous materials comprising a plurality of fibers having a longitudinal alignment gradient and/or a longitudinal composition gradient. Also described are methods of preparing the fibrous materials thereof and methods of treating organ or tissue damage with the fibrous materials.