Provided is a nanofiber based composite false twist yarn that is obtained by producing a nanofiber tape yarn by precisely slitting a nanofiber membrane produced by electrospinning and then twisting a nanofiber-only twist yarn that is obtained by twisting the nanofiber tape yarn or composite-twisting a nanofiber-only twist yarn and a natural fiber or synthetic fiber. The nanofiber based composite false twist yarn includes: a nanofiber tape yarn including at least one bonding portion or a false twist yarn which is obtained by false twisting the nanofiber tape yarn; and a natural fiber yarn or a synthetic fiber yarn that is composite-false-twisted with the nanofiber tape yarn or the false twist yarn, wherein the nanofiber tape yarn is made of a nanofiber web that is obtained by integrating polymer nanofibers made of a fiber-forming polymer material and having an average diameter of less than 1 m thereby having fine pores.

Provided is a nanofiber based composite false twist yarn that is obtained by producing a nanofiber tape yarn by precisely slitting a nanofiber membrane produced by electrospinning and then twisting a nanofiber-only twist yarn that is obtained by twisting the nanofiber tape yarn or composite-twisting a nanofiber-only twist yarn and a natural fiber or synthetic fiber. The nanofiber based composite false twist yarn includes: a nanofiber tape yarn including at least one bonding portion or a false twist yarn which is obtained by false twisting the nanofiber tape yarn; and a natural fiber yarn or a synthetic fiber yarn that is composite-false-twisted with the nanofiber tape yarn or the false twist yarn, wherein the nanofiber tape yarn is made of a nanofiber web that is obtained by integrating polymer nanofibers made of a fiber-forming polymer material and having an average diameter of less than 1 m thereby having fine pores.

Provided is an abrasion-resistant polyester fiber, which has, in particular, a strength within a specific range, an elongation within a specific range and a Young's modulus falling within a specific range in a specific elongation range on a stress-strain curve, to improve the abrasion resistance of a woven/knitted product for clothing using, in particular, a fine size polyester fiber. The polyester fiber is an abrasion-resistant polyester fiber comprising ethylene terephthalate as a main repeating unit, characterized by satisfying the following requirements: (1) the fineness being from 8 dtex to 200 dtex inclusive; (2) the single yarn fineness being from 1.0 dtex to 4.0 dtex inclusive; (3) the breaking strength being 3.5 cN/dtex or greater; (4) the breaking elongation being from 20% to 50% inclusive; and (5) the minimum differential Young's modulus being 20 cN/dtex or less in an elongation range of from 2% to 5% inclusive on a stress-strain curve of the fiber.

A method of manufacturing multi-ply separable textured yarn, the method comprising, passing a multi-ply separable interlaced filament yarn through a texturizing unit to form a multi-ply separable draw textured yarn, wherein the multi-ply separable interlaced filament yarn is separable in to at least two separable interlaced filament yarn, wherein the interlacing of the filaments within each separable interlaced filament yarn is retained during further processing of the yarn to fabric and in the fabric.

A yarn including a plurality of twists formed by twisting single fiber strand or multiple fiber strands; and fiber grooves, which are spaces formed between the twists, to provide three-dimensional growth spaces and migration paths for cells. Accordingly, a cell proliferation rate and cell viability may be enhanced by creating microenvironments suitable for migration, proliferation and differentiation of cultured cells. In addition, cell clusters having more uniform shapes may be easily implemented by forming the proliferation spaces and migration paths for the cultured cells as similar as possible to each other in each scaffold. Further, the cells cultured thereby can be cultured in a suitable shape and structure to be applied to an in vitro experimental model or transplanted into the body of an animal, and can be widely applied in various products used in a cell culture or tissue engineering field.

A yarn including a plurality of twists formed by twisting single fiber strand or multiple fiber strands; and fiber grooves, which are spaces formed between the twists, to provide three-dimensional growth spaces and migration paths for cells. Accordingly, a cell proliferation rate and cell viability may be enhanced by creating microenvironments suitable for migration, proliferation and differentiation of cultured cells. In addition, cell clusters having more uniform shapes may be easily implemented by forming the proliferation spaces and migration paths for the cultured cells as similar as possible to each other in each scaffold. Further, the cells cultured thereby can be cultured in a suitable shape and structure to be applied to an in vitro experimental model or transplanted into the body of an animal, and can be widely applied in various products used in a cell culture or tissue engineering field.

Methods, systems, and apparatus for fabricating nanofiber yarn at rates at of at least 30 m/min (1.8 kilometers (km)/hour (hr)) using a false twist nanofiber yarn spinner and a false twist spinning technique. In a false twist spinning technique, a twist is introduced to nanofibers in a strand by twisting the nanofibers at points between ends of the strand. This is in contrast to the true twist technique where one end of a strand is fixed and the opposing end of the strand is rotated to introduce the twist to intervening portions of yarn

A hygroscopic core-sheath composite fiber includes: a polyetheresteramide copolymer as a core polymer; and a polyamide as a sheath polymer, and has a degree of shrinkage with boiling water of 6-11%. The core-sheath composite fiber has high hygroscopicity and laundering durability of the hygroscopicity which makes the fiber withstand practical use, and is capable of attaining a soft feeling.

The present disclosure relates to methods for preparing nanodiamond-containing thermoplastic fibers and filaments having diamond particles substantially uniformly distributed throughout. The process comprises melt extruding a material comprising a thermoplastic polymer and from about 0.001% to about 0.25% by weight nanosized diamond particles. The present disclosure also relates to yarns and fabrics comprising the nanodiamond-containing thermoplastic fibers or filaments, and to garments comprising these yarns and/or fabrics. Yarns and fabrics comprising nanodiamond-containing thermoplastic fibers and filaments have been found to have enhanced thermal properties, enhanced mechanical properties, and/or enhanced softness.

The present disclosure relates to methods for preparing nanodiamond-containing thermoplastic fibers and filaments having diamond particles substantially uniformly distributed throughout. The process comprises melt extruding a material comprising a thermoplastic polymer and from about 0.001% to about 0.25% by weight nanosized diamond particles. The present disclosure also relates to yarns and fabrics comprising the nanodiamond-containing thermoplastic fibers or filaments, and to garments comprising these yarns and/or fabrics. Yarns and fabrics comprising nanodiamond-containing thermoplastic fibers and filaments have been found to have enhanced thermal properties, enhanced mechanical properties, and/or enhanced softness.