Classic yarn, refers to a variety of textile fibers processed into a certain degree of fine products, for weaving, rope, line, knitting and embroidery. Yarn is divided into: ① short fiber yarn, from the short fiber (natural short fiber or fiber section of the fiber) by spinning processing, split ring yarn, free spinning, since the twist yarn. ② continuous filaments, such as natural silk and chemical fiber filament, add or not twist, smooth filament or deformation filament. ③ short fiber and continuous filament combination yarn, such as polyester-cotton filament yarn. Line by two or more shares of the single yarn and twisted together.
The fineness of the yarn has a variety of representation methods, such as number, metric count, inch count, denier, etc. (see count). The twist of the yarn is expressed in meters or meters per inch. Twist back to the direction of S and twist. Within a certain degree of twist, the strength of the yarn increases with increasing twist. The twist of the yarn and the twist of the strands are selected according to the use of the strands. Usually the single yarn and the opposite direction of the twist, that is, ZS or SZ. There is an optimum ratio between the singular yarn and the twist of the strands. In this range, the strength of the strands increases with the increase of the twist of the strands, and the strength of the strands decreases after exceeding the critical value. The properties of the fibers and the spinning method play a decisive role in the performance of the yarn. Ring yarn in the twist process, due to fiber transfer, from the inner layer of the yarn to the outer layer, and then from the outer layer to the inner layer, repeated repeated transfer, the fiber around the axis of the yarn was spiral, spiral radius along the axis To increase or decrease alternately. At this time the length of the fiber more tend to yarn axis, the length of the fiber tend to tend to more than the outer layer of yarn. Fine fineness of the fiber tends to the axis of the yarn, fineness of the fiber tends to the outer layer of yarn. The fibers with smaller initial modulus are located in the outer layer, and the fibers with the initial modulus are mostly in the inner layer. Reasonable selection of different traits of fiber, can be spun into different styles of yarn, to adapt to different fabric use or improve the performance. As the chemical fiber can be arbitrarily selected length, fineness and fiber cross-sectional shape, coat fabric should use slightly thick fiber, slightly shorter length of chemical fiber and cotton blended to increase the yarn surface texture. Underwear fabric should use fine fibers, slightly longer length of the chemical fiber, the cotton fiber in the outer layer of yarn in order to improve the hygroscopic properties and wearing comfort. Free spinning, including air spinning, electrospinning, vortex spinning and other spinning into the yarn, due to twist when the fiber inward transfer less, compared with the outer core of the core, the outer tight, loose structure, fiber straightness Poor, poor adhesion between the fibers, yarn low strength, but the dyeing and wear resistance is good. Since the twist spinning spinning yarn, also known as since the twist yarn, is the use of twisting roller on the strip to produce periodic positive and negative fake twist, the yarn appeared on the cyclical point, so the lower strength, the general After the yarn and then weaving.
There are two solutions to the problem of yarn strength. One way is to use more advanced spinning techniques to spun yarn that can be applied to easy care fabrics, such as tight ring spinning, without changing the raw material.
The second method is to adjust the raw materials and change the yarn structure of the method, through the original natural fiber and excellent performance meet the requirements of fiber care through a certain spinning method to combine the two, the effect of the ideal yarn, the main There are blended yarn, composite yarn, etc., respectively, the following were introduced.
Two or more than two kinds of fiber mixed spinning, mainly using scattered fiber mixing and mixing of the way. Through the original fiber raw materials and other high strength, high modulus of the fiber to increase the strength of the entire yarn. This compound yarn has a traditional polyester / cotton, polyester / sticky, polyester / wool, etc., and polyester / cotton / Tencel fiber, polyester / cotton / cashmere and so on.
2. Composite yarn
Two different fibers in a single yarn or filament intertwined with a similar structure, can be spinning in the modified spinning machine, can also be spun in the hollow spindle. Mainly spinning, Cerrofo spirits, wrapped spinning, including core spinning and so on.