An actuator which is formed of a fibrous polymer material configured with a polymer, and includes a twist mark on an outermost surface of the fibrous polymer material, in which an angle x at which the twist mark is inclined with respect to a fiber axis of the fibrous polymer material, and an angle y at which the twist mark inclined with respect to a fiber axis of a fiber at the time of twisting the fiber configured with the polymer configuring the fibrous polymer material by adding a tensile stress of an tensile elastic modulus of the fiber4.510.sup.3 under an environment of 25 C. up to a limitation on which coiling occurs or a limitation on which a breakage occurs have a relationship of x>y+0.5.

Wool-like, synthetic multifilament yarns may be produced with a plurality of primary yarns and at least one secondary yarn. Generally, the primary yarn and secondary yarn may be produced from polyamides. The wool-like multifilament yarns may be produced by: (1) melt-spinning the primary yarns and the secondary yarn; (2) drawing and texturizing the primary yarns and the secondary yarns; (3) entangling the texturized primary yarns and the texturized secondary yarn to form the inventive yarn; (4) optionally subjecting the inventive yarn to heat-setting or heat annealing; and (5) winding the yarn onto a package for distribution. The multifilament yarns may be used to produce floorcoverings.

Hair for a doll, toy or a wearable item is reversibly stylable. The hair can change between straight and curly hair by subjecting the hair to a change of temperature. This temperature change can be by the application of heat, coolness or cold. In one form, then, straighten of curved doll hair filaments is through hot air or hot water. (38-40 degrees). A doll figure can include auto fitting smart hair filaments for practicing the method. Pulling straight doll hair turns the hair to curly. Straightening is affected through heat. The doll has hair filaments which are formed by shape memory plastic material.

Hair for a doll, toy or a wearable item is reversibly stylable. The hair can change between straight and curly hair by subjecting the hair to a change of temperature. This temperature change can be by the application of heat, coolness or cold. In one form, then, straighten of curved doll hair filaments is through hot air or hot water. (38-40 degrees). A doll figure can include auto fitting smart hair filaments for practicing the method. Pulling straight doll hair turns the hair to curly. Straightening is affected through heat. The doll has hair filaments which are formed by shape memory plastic material.

A yarn texturizing apparatus and method for texturizing a plurality of yarns, which can include a tack assembly and a jet box assembly. The tack assembly can be configured to receive a bundle of yarns and impart a plurality of twists to each bundle of yarns and subsequently impart a first tack point at a point corresponding to a twist reversal between the twists. The downstream jet box assembly can be configured to place a plurality of additional tack points intermittently along the plurality of twists of each bundle of yarn.

Methods and a device for the continuous manufacturing of artificial muscle actuator device fibers are disclosed. The method includes: threading an untwisted fiber along the axis of a tube and inside the tube that includes a heating means to raise the localized temperature of a cross-section of the tube to a predetermined temperature; providing a tension on the untwisted fiber; and twisting the untwisted fiber while the fiber is within the tube.

A multifunctional fiber with full-spectrum infrared radiation, flame retardant and antibacterial functions, including a composite masterbatch having a water content of 30-50 ppm and accounting for 10-12% by weight, polyethylene terephthalate having a water content of 25-30 ppm or polycaprolactam high polymer having a water content of 50-70 ppm and accounting for 88-90% by weight; the fiber and its fabric possess multiple functions such as spectral heating, flame retardancy, anti-bacteria and anti-virus; after being illuminated for 5-10 minutes, the temperature difference of the fiber fabric of the present invention is higher than 15-20? C., the far-infrared emissivity is greater than 98%, the radiation temperature rise is greater than 3.0? C., the CLO value is greater than 0.5, the heat transfer coefficient is greater than 18.0w/(m.sup.2k), and the thermal resistance is less than 0.05 (m.sup.2k)/w. The antibacterial rate against Escherichia coli, Staphylococcus aureus, Candida albicans and pneumobacillus is greater than 99.0%.

A woven, water-vapor permeable, water-responsive, shape-memory wool fabric that possesses switchable pore size and shape responsive to varying water content absorbed thereby is demonstrated, more particularly, the wool fabric exerts corresponding thermal and water vapor regulations between the wearer and the surroundings with respect to the temperature and humidity changes.

Systems for fabricating nanofiber yarn at rates 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 are disclosed. 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.

Systems for fabricating nanofiber yarn at rates 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 are disclosed. 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.