is a synthetic yarn containing microfine fibers, which have an average single-fiber fineness of 0.5 dtex or less. The fibers are impregnated with an elastic polymer. The resulting composite yarn is characterized by its mechanical properties, such as breaking stress, strain, modulus and work of rupture.
Various types of microfine fibers are available and are used for diverse applications, including woven fabrics, knitting yarns, nonwoven fabric and a substrate for artificial leathers. Among them, the most common type is a monofilament yarn with an average single-fiber fineness of about 0.75 dtex.
This type of yarn possesses excellent hand, drape and softness. It also absorbs and wicks moisture well, making it comfortable to wear.
In addition, the tensile strength and elongation of the microfine composite yarn are higher than that of a conventional twisted yarn. The elongating stress imposed on the microfine composite yarn is carried by an elastic core member and an inelastic covering member surrounding the elastic core member, thereby reducing the tendency to break.
The basic yarn is produced by spinning at a temperature of about 120 deg C to 380 deg C. The basic yarn is cooled in the cooling stage and then stretched to a length of 2 to 50 times or more at a temperature of about 20 deg C. to 280 deg C., and is 10 to 1500 deniers. Then it is drawn and wound up in a winding machine.