A solid-state drawing method for preparing a surgical suture or a biodegradable stent having improved flexibility and mechanical strength. The method for preparing a biodegradable stent includes (a) providing a biodegradable filament that comprises a material which is biodegradable; (b) solid-state drawing the biodegradable filament to provide a drawn biodegradable filament; (c) shaping the drawn biodegradable filament to provide a shaped biodegradable filament; and (d) annealing the shaped biodegradable filament to provide the biodegradable stent, wherein the biodegradable filament has a draw ratio that ranges from 1.1 to 5.0; and wherein the draw ratio is calculated by Equation 1 below:
Draw ratio=(L.sub.SSD/L.sub.O).sup.2, where L.sub.O is length of the biodegradable filament before the solid-state drawing, and L.sub.SSD is the length of the biodegradable filament after the solid-state drawing.

The apparatus for producing ultrafine fibers includes a nozzle portion, a laser irradiation unit, and a drawing chamber. The nozzle portion has an inlet for feeding a raw fiber, a first jet outlet which communicates with the inlet and jets a first drawing gas stream for delivering and drawing the raw fiber, and a second jet outlet which is arranged in the periphery of the first jet outlet and jets a second drawing gas stream. The laser irradiation unit on which the nozzle portion is installed irradiates a laser light to the raw fiber delivered from first jet outlet to melt the raw fiber. The drawing chamber draws the melted raw fiber by using the first drawing gas stream and the second drawing gas stream which are jetted from the nozzle portion.

A draw device into which at least two filaments are guided for producing a multi-coloured yarn from differently coloured filaments which consist of a plurality of endless filaments includes a pair of intake rollers for receiving the at least two filaments. Two pairs of drafting system rollers follow the intake rollers to draw the at least two filaments. A texturizing device comprising a texturizing nozzle with a cooling drum is disposed downstream of the two pairs of drafting system rollers to texturize the at least two filaments, wherein at least one yarn is formed from the filaments in the texturizing nozzle. At least one further nozzle is disposed exclusively upstream of the texturizing device in which each filament is separately interlaced. The filaments are drawn on at least one of the two pairs of drafting system rollers at a speed of at least 1,700 m/min.

An object of the present invention is to provide a polyolefin fiber, particularly a core-sheath composite polypropylene fiber which is possible to be easily deformed corresponding to a stress applied from a direction perpendicular to a fiber axis, to be less fibrillated, and to have an excellent knot strength.

The problem of the present invention is solved by providing the polyolefin fiber having a compressive strength of 30 to 51 MPa calculated by the following formula 1 when compressed and deformed by 30% with respect to a fiber diameter in a direction perpendicular to the fiber axis in each single fiber.

St=2P/(Ld)(Formula 1) St: Compressive strength (MPa), P: Testing force (N) d: Single fiber diameter (mm), L: Diameter of indenter (mm)

An absorbent article containing a nonwoven web that includes a plurality of polyolefin fibers is provided. The polyolefin fibers are formed by a thermoplastic composition containing a continuous phase that includes a polyolefin matrix polymer and nanoinclusion additive is provided. The nanoinclusion additive is dispersed within the continuous phase as discrete nano-scale phase domains. When drawn, the nano-scale phase domains are able to interact with the matrix in a unique manner to create a network of nanopores.

Disclosed is an elastic composite fiber, comprising a fiber body, wherein according to weight percentage, the material composition of the fiber body is made by composite spinning 10%-90% low viscosity PET, 10%-90% high viscosity PET, 10-80% PTT and 10-80% PBT. The present invention combines the advantages of the PET, PTT and PBT fibers into one, and not only has the advantages of good spinnability, high strength, good elasticity, softness, comfortableness, easy dyeing, moisture absorption and the like, but also utilizes reasonable cooperation between materials and the difference between physical and chemical properties to make the three-dimensional structure of the composite fiber more remarkable and the thermal stability better.

Methods and systems for mechanically forming one or more surface protrusions integrally from a garment material, the one or more surface protrusions extending outwardly from a garment surface of the garment material, include placing at least one selected area of the garment surface against a first surface of a forming die having a plurality of openings which have a configuration and orientation corresponding with the configuration and orientation of the one or more surface protrusions of the garment material. The garment surface may be softened by application of a source of energy, wherein the source of energy comprises at least two sonotrodes mounted in a rotary drum. At least some of the softened garment surface is positioned into at least one opening of the plurality of openings.

Systems, methods, and apparatus to provide artificial whisker filaments are disclosed and described. An example artificial whisker is tapered to include a tip diameter smaller than a base diameter of the artificial whisker, the artificial whisker formed from a polymer arranged to permit elastic deformation of the artificial whisker, the deformation of the artificial whisker to transmit force to a sensor associated with a base of the artificial whisker. An example method of manufacturing an artificial whisker includes removably affixing a first end of a filament to a heated, non-stick surface; drawing the filament across the surface to form a first, tapered portion, a second portion of the filament remaining on the surface, wherein the filament is to be drawn until the first portion is disengaged from the surface; and separating the first, tapered portion of the filament from the second portion of the filament to form a tapered artificial whisker.

A biodegradable stent and a method for preparing the same, which more particularly relate to a technology of preparing a biodegradable stent with improved flexibility and mechanical strength. The method includes a step of solid-state drawing a biodegradable filament and a step of shaping and then annealing the drawn biodegradable filament.

A poly(phenylene sulfide) fiber contains 1-10% by weight of a poly(phenylene sulfide) oligomer having a weight-average molecular weight of 5,000 or less, has a difference between a cold crystallization heat quantity (Hc) and a crystal melting heat quantity (Hm) during temperature rising in DSC, HmHc, of 25 J/g or larger, and has an elongation of less than 40% and a strength of 3.0 cN/dtex or higher. The poly(phenylene sulfide) fiber has high heat resistance and chemical resistance and high strength and, despite this, has excellent suitability for high-order processing, e.g., thermal shapability, because the amorphous parts thereof have high molecular movability.