The feel and characteristics of textile products are mainly determined by the amount of hairiness. It can be seen from the production test that the hairiness with a length of less than 2 mm has little effect on the production process and the appearance quality of the fabric, on the contrary, it will make the fabric have a naturally soft feel. However, hairiness with a length of more than 3 mm is a potential factor affecting yarn quality. Read More: Thread for Sewing Machine, Best Thread Suppliers
Different yarn forming and twisting processes produce different yarn structures and different product characteristics.
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Yarn strength depends on the cohesion and friction between fibers. If the shape and arrangement of the fibers are not good, that is, there are fibers such as bending, looping, folding in half, and entanglement, it is equivalent to shortening the length of the fibers and weakening the degree of contact between the fibers, so it is easy to generate slippage between fibers and reduce Strong yarn.
According to the test, if the strength of the ring-spun yarn is 1, then the strength of other types of yarn is: 0.8-0.9 for rotor-spun yarn, 0.6-0.7 for air-jet yarn, 0.8 for vortex yarn, and the highest strength for compact spinning is 1.15.
The feel and characteristics of textile products are mainly determined by the amount of hairiness. It can be seen from the production test that the hairiness with a length of less than 2 mm has little effect on the production process and the appearance quality of the fabric, on the contrary, it will make the fabric have a naturally soft feel. However, hairiness with a length of more than 3 mm is a potential factor affecting yarn quality. Compared with traditional ring-spun yarn, air-jet yarn, vortex yarn, and compact yarn have reduced hairiness of 1-2 mm, while air-jet yarn has more short hairiness due to the low number of winding fibers and less coverage of untwisted yarn core. , specifically in the spinning process, the amount of hairiness can be controlled by adjusting the process parameters.
Comparison of Yarn Hairiness of Different Spinning Methods
Compared with traditional ring-spun yarn, the number of harmful hairiness (>3mm) of non-traditional spinning is significantly reduced, among which compact yarn is reduced by about 80%, air-jet yarn is reduced by about 85%, and vortex spinning is reduced by more than 90%. The new yarns all have good post-processing properties. Thanks to the new yarn structure which stabilizes the yarn surface, the hairiness increase in post-processing is significantly lower than with conventional yarns. Especially as a warp yarn, about 50% of the size can be saved during sizing, which greatly improves the efficiency of the loom and reduces the cost of weaving. According to information, the use of new yarns in the United States can reduce the cost of weaving per 100m of cloth by 2.4 US dollars, and the fly can be reduced by 72%.
The abrasion resistance of yarn is closely related to the structure of the yarn.
Most of the fibers of traditional ring-spun yarn are helical. When rubbed repeatedly, the helical fibers gradually become axial fibers, and the yarn is easy to lose twist and disintegrate and wear off quickly, so the wear resistance is poor.
Non-traditional spinning has obvious advantages in wear resistance. Rotor-spun yarn, air-jet yarn, and vortex yarn are all composed of yarn core and outer fiber. The surface of the yarn is covered with irregular winding fibers, and the yarn is not easy to disintegrate. At the same time, the surface friction coefficient of the yarn 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 are arranged neatly and straightly, the yarn structure is compact, and the fibers are not easy to loosen, so the yarn has better abrasion resistance.
Twist potential is also an important property of yarns and determines some properties of fabrics, such as the slope of knitted fabrics.
Traditional ring-spun yarn and compact yarn are true-twist spun yarns, which have a large twist potential and are prone to bevels and edge curls in knitted fabrics. Sometimes doubling is needed to make up for it.
The yarn structure of the rotor-spun yarn, air-jet yarn, and vortex yarn determine that its twist potential is small. The Z-twist and S-twist of the rotor-spun yarn exist at the same time, so the twisted potential is the lowest. Due to the high proportion of parallel fibers in the air-jet yarn, the twisting force is small, and it also has good post-processing characteristics.
Vortex yarn knitted fabric has good abrasion resistance and high anti-pilling grade. This is because the middle of the vortex yarn is a straight core yarn, 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 in the fabric is good, it is not easy to produce relative slippage, and the wear resistance is improved. In addition, pilling is also closely related to yarn hairiness. Through the pilling test, it can be seen that the vortex yarn fabric is 4-4.5, the air-jet yarn is 4, the traditional ring-spun yarn is 2, the rotor yarn is 2-3, and the compact spinning is 3-4.
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