Different yarn twisting processes produce different yarn structures and different product characteristics.
1. Strength
The strength of yarn depends on the cohesion and friction between fibers. If the fiber shape and arrangement are poor, that is, there are bending, looping, folding, winding, etc. fibers, it is equivalent to shortening the fiber length and weakening the degree of fiber contact, thus easily causing slippage between fibers and reducing the Yarn strength.
It is known from experiments that if the strength of ring-spun yarn is 1, then the strength of other types of yarns is: rotor yarn 0.8~0.9, air-jet yarn 0.6~0.7, vortex yarn 0.8, compact spinning yarn The high strength is 1.15.
2. Hairiness
The feel and characteristics of textile products are mainly determined by the amount of hairiness. From the production test, it can be clearly seen that hairiness with a length of less than 2mm has little impact on the production process and the appearance quality of the fabric. On the contrary, it will give the fabric a natural soft feel. However, hairiness longer than 3mm is a potential factor affecting yarn quality. Compared with traditional ring-spun yarn, the hairiness of 1 to 2 mm in air-jet yarn, vortex yarn, and compact yarn is reduced. However, air-jet yarn has more short hairiness due to the low number of winding fibers and less untwisted yarn core coverage. Of course, , specifically in the spinning process, the amount of hairiness can be controlled by adjusting process parameters.
It is a comparison of the hairiness number of yarns produced by different spinning methods. Compared with traditional ring-spun yarn, the number of harmful hairiness (>3mm) in non-traditional spinning yarn is significantly reduced, of which the compact yarn is reduced by about 80%, the air-jet yarn is reduced by about 85%, and the vortex spinning is reduced by more than 90%. Therefore, The new yarns all have good post-processing properties. Since the new yarn structure makes the yarn surface more stable, the increase in hairiness in post-processing is significantly lower than that of conventional yarns. Especially as warp yarn, it can save about 50% of sizing material during sizing, greatly improving the efficiency of the loom and reducing the weaving cost. According to some data, the use of new yarns in the United States can reduce the weaving cost by US$2.4 per 100m of fabric, and reduce fly waste by 72%.
3. Wear resistance
The wear resistance of yarn is closely related to the structure of the yarn.
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Non-traditional spinning has obvious advantages in wear resistance. Rotor yarn, air-jet yarn and vortex yarn are all composed of yarn core and outer fiber. The surface of the yarn is wrapped with irregular windings. Fibers and yarns are not easy to disintegrate. At the same time, the friction coefficient of the yarn surface is large. The cohesion between yarns in the fabric is good and relative slippage is not easy to occur, so the wear resistance is improved.
Compared with ring-spun yarn, the fibers of compact spinning yarn are arranged neatly and straightly, and the yarn structure is tight.The fibers are not easy to come apart, so the yarn has good wear resistance.
4. Twist potential
Twist potential is also an important characteristic of yarn, and determines some characteristics of fabrics, such as the slope of knitted fabrics.
Traditional ring-spun yarn and compact yarn are true-twisted yarns with large twist potential, which can easily cause diagonal paths and curling of knitted fabrics. Sometimes doubling is needed to compensate.
The yarn structure of rotor yarn, air-jet yarn and vortex yarn determines its small twist potential. Rotor yarn has z-twist and s-twist at the same time, so the twist potential is low. Due to the high proportion of parallel fibers in the air-jet yarn, the twist force is small and it also has good post-processing characteristics.
5. Anti-pilling
Vortex yarn knitted fabric has good wear resistance and high pilling resistance. This is because the middle of the vortex yarn is a straight core yarn, and the outer layer is covered with winding fibers. The fiber orientation is obvious, the yarn friction coefficient is large, the friction between the yarns in the fabric is good, and relative slippage is not easy to occur, and the wear resistance is improved. In addition, pilling is also closely related to the hairiness of the yarn. Through the pilling test, it can be seen that the vortex yarn fabric is grade 4 to 4.5, the air-jet yarn is grade 4, the traditional ring yarn is grade 2, the rotor yarn is grade 2 to 3, and the compact yarn is grade 3 to 4.
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