What is the material of yarn? What is the material of yarn

What is the material of yarn? What material is yarn made of? Yarn is a kind of textile, which is processed into products of certain fineness with various textile fibers for weaving, rope making, thread making, knitting and embroidery. It is divided into short fiber yarn, continuous filament, etc.
Yarn fineness can be expressed in many ways, such as number, metric count, imperial count, denier, etc. (see count). The twist of the yarn is expressed as the number of twists per meter or inch.
Wool yarn and wool yarn are generally used for weaving woolen sweaters, sweaters, vests, scarves, hats and gloves, and weaving various clothing articles in spring and autumn. They are also used for decoration in addition to warmth preservation.
Yarns are divided into: ① short fiber yarn, which is made of short fiber (natural short fiber or chemical fiber cut fiber) by spinning, ring spinning, free end spinning, self twisting yarn, etc. ② Continuous filament, such as natural silk and chemical filament, can be twisted or untwisted, smooth filament or deformed filament. ③ Short fiber and continuous filament combination yarn, such as polyester cotton filament core spun yarn, etc. Thread is made of two or more strands of single yarn combined and twisted.
Yarn fineness can be expressed in many ways, such as number, metric count, imperial count, denier, etc. (see count). The twist of the yarn is expressed as the number of twists per meter or inch. The direction of twist back is divided into S twist and Z twist. Within a certain range of twist, the strength of yarn increases with the increase of twist. The twist direction of single yarn and the twist direction of ply yarn are selected according to the use of ply yarn. Generally, single yarn and ply yarn are twisted in the opposite direction, i.e. ZS or SZ. There is an optimal twist ratio between single yarn and ply yarn. Within this range, the strength of ply yarn increases with the twist of ply yarn, and decreases when the twist exceeds the critical value. Fiber properties and spinning methods play a decisive role in yarn performance. During the twisting process of ring spun yarn, due to the transfer of fibers, the fibers are transferred repeatedly from the inner layer of the yarn to the outer layer, and then from the outer layer to the inner layer. The fibers are spiral around the yarn axis, and the spiral radius increases or decreases alternately along the axis. At this time, long fibers tend more to the axis of the yarn, while short fibers tend more to the outer layer of the yarn. Fine fibers tend to the axis of the yarn, and coarse fibers tend to the outer layer of the yarn. The fibers with smaller initial modulus are more located in the outer layer, while the fibers with larger initial modulus are more located in the inner layer. Reasonable selection of fibers with different properties can produce yarns of different styles, adapt to different fabric uses or improve the wearability. As the chemical fiber can be arbitrarily selected in terms of length, fineness and cross section shape of the fiber, it is better to select the chemical fiber with a slightly thicker fiber and a slightly shorter length to be blended with cotton for outerwear fabric, so as to increase the wool shape of the yarn surface. The underwear fabric should be made of chemical fiber with slightly thinner fiber and longer length to make the cotton fiber in the outer layer of the yarn, so as to improve the moisture absorption performance and wearing comfort. Free end spinning includes rotor spinning, electrostatic spinning, vortex spinning and other spun yarns. Due to less fiber transfer to the inside during twisting, the core is tight inside and loose outside, the structure is loose, the fiber straightness is poor, the cohesion between fibers is poor, and the yarn strength is low, but the dyeing and wear resistance are good. The yarn spun by self twist spinning is also called self twist yarn. It uses the twist roller to produce periodic positive and negative false twist on the whiskers, and there are periodic twist free points on the yarn, so the strength is low. Generally, the yarn is woven after being folded into strands.
Filament yarn is a bundle consisting of filaments (such as natural silk, chemical filament or rayon); It mainly includes polyester filament, viscose filament, nylon filament, etc.
Fancy yarn mainly shows changes in yarn appearance or color. It mainly includes wrapping, core wrapping, bamboo knots, belly, colored dots, waves, braids, towels, loops, knots, feathers, toothbrushes, centipedes, ribbons, Duan Ran, Chenille, etc.