Different yarn forming and twisting processes produce different yarn structures and different product characteristics.
Yarn strength depends on the binding force and friction between the fibers. If the shape and arrangement of the fiber is poor, that is, there are bending, circling, folding, winding and other fibers, it is equivalent to shortening the length of the fiber, weakening the degree of fiber contact, so it is easy to produce fiber slip, reduce the strength of yarn.
According TO THE TEST, IF THE STRENGTH OF RING-SPUN YARN is 1, THE strength OF other kinds OF yarn is 0.8 ~ 0.9, 0.6 ~ 0.7 OF AIR-JET yarn, 0.8 OF VORTEX yarn, and the HIGHEST strength OF TIGHTLY SPUN yarn is 1.15.
The feel and characteristics of textile products are mainly determined by the number of hairs. From the production test, it can be clearly seen that the hair length less than 2mm has little influence on the production process and the appearance quality of the fabric, on the contrary, it will make the fabric have a natural soft feel. However, hairs longer than 3mm are a potential factor affecting yarn quality. Compared with the traditional ring spinning yarn, the 1-2mm hairiness of air flow yarn, vortex yarn and tight yarn are all reduced, while the air-jet yarn has more short hairiness due to the low number of wound fibers and less coverage of the non-twist yarn core. Of course, the number of hairiness can be controlled by adjusting the process parameters in the spinning process.
Is the comparison of yarn hairiness number of different spinning methods. Compared with the traditional ring spinning yarn, the number of harmful hairiness (>3mm) of the non-traditional spinning yarn is significantly reduced. The tight yarn is reduced by about 80%, the air-jet yarn is reduced by about 85%, and the eddy spinning yarn is reduced by more than 90%. Therefore, the new yarn has good post-processing characteristics. Since the new yarn structure makes the yarn surface more stable, the hair increase after processing is significantly lower than that of the traditional yarn. Especially as a warp yarn, the size can be saved about 50% in sizing, greatly improving loom efficiency and reducing weaving cost. According to the data, in the United States, the cost of weaving with the new yarn can be reduced by $2.4 per 100m cloth, and the flying flower can be reduced by 72%.
3. Wear resistance
The wear resistance of yarn is closely related to yarn structure.
Because most of the fibers of traditional ring spinning yarn are spiral, when repeated friction, spiral fiber gradually becomes axial fiber, yarn is easy to disintegrate and quickly wear off, so the wear resistance is poor.
Non-traditional spinning has obvious advantage in resistance to wear, rotor yarn, jet yarn and vortex yarn consists of two parts, outsourcing core yarn and fiber, yarn surface with irregular wrapping fibre, yarn is not easy to collapse, at the same time, the yarn surface friction coefficient is big, between the yarn in the fabric and yarn as well is good, not easy to produce relative sliding, so the wear resistance improved.
Compared with ring-spun yarns, tightly spun yarns have neat and straight fibers, tight yarn structure, and fiber is not easy to come loose, so the yarn has good wear resistance.
Twist potential is also an important property of yarn and determines some properties of the fabric, such as the slope of the knitted fabric.
Traditional ring-spun yarns and tight-spun yarns are true-twist yarns, which have a high twist potential and are prone to bevel and curl of knitted fabrics, which sometimes need to be compensated by parallel yarns.
The yarn structure of spinning cup yarn, air-jet yarn and eddy current yarn determines the small twist potential. z twist and s twist exist simultaneously, so the twist potential is the lowest. Because of the high proportion of parallel fibers in air-jet yarn, the twist return force is small, and it also has good post-processing characteristics.
5, anti pilling
Eddy yarn knitted fabric has good wear resistance and high pilling resistance. This is because the vortex yarn has a flat core yarn in the middle, and the outer layer is covered with winding fibers. The fiber orientation is obvious, the friction coefficient of the yarn is large, the friction between the inner yarn and the yarn is good, and the relative slip is not easy to occur, and the wear resistance is improved. In addition, pilling is closely related to the hairiness of the yarn. Through THE PILLING TEST, IT CAN be SEEN THAT: VORTEX YARN 4 ~ 4.5 levels, air jet yarn 4 levels, traditional ring spinning yarn 2 levels, rotary cup yarn 2 ~ 3 levels, tight spinning yarn 3 ~ 4 levels.