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What’s the effect of different twisting degrees on the yarn?

October 26,2022

The twist degree of the yarn not only affects the appearance quality such as the diameter and gloss of the yarn, but also affects the inner quality and feel of the yarn such as strength, elasticity and elongation. Therefore, the determination of the degree of yarn twisting in the textile process is also very important.

1.Effect on Yarn Diameter and Density

The diameter and density of the strands are also related to the twist direction of the strands and single yarns. When the twist direction of the strand is the same as that of the single yarn, the relationship between the twist coefficient and the density and diameter is similar to that of the single yarn. When the twist direction of the strand and the single yarn is opposite, when the twist coefficient of the strand is small, the density of the strand will decrease and the diameter will increase due to the untwisting effect of the single yarn; when the twist coefficient reaches a certain value, the The density of the strand increases with the increase of the twist coefficient, while the diameter decreases with the increase of the twist coefficient. As the twist continues, the density does not change much, and the diameter gradually increases.

2.Effect on yarn strength

For staple fiber yarn, the most direct effect of twisting is to obtain strength, but it is not that the greater the degree of twisting, the greater the strength of the yarn. The reason is that twisting has factors that are conducive to improving the strength of the yarn. There are also factors that are not conducive to the strength of the yarn.
Under the action of external tensile force, the yarn breakage always occurs at the place where the yarn strength is the smallest, and the strength of the yarn is the external force that the weak loop can bear. As the twist coefficient increases, more twist turns are distributed at the weak loop, so that the strength of the weak loop is increased more than other places, so that the yarn strength is improved.The effect of twisting on yarn strength, favorable factors and unfavorable factors are the unity of opposites. When the twist coefficient is small, the favorable factors play a leading role, and it is shown that the yarn tenacity increases with the increase of the twist coefficient. When the twist coefficient reaches a certain value, the unfavorable factors play a leading role, and the yarn strength decreases with the increase of the twist coefficient. In the process design, a twist less than the critical twist coefficient is generally used to improve the production efficiency of the spinning frame on the premise of ensuring the spinning strength.

3.Effect on elongation at break of yarn

For single yarns, twisting reduces the possibility of fiber slippage in the yarn and increases the fiber elongation deformation, which is manifested as a decrease in the elongation at break of the yarn. However, with the increase of the twist coefficient, the inclination of the fiber in the yarn increases, and the inclination of the fiber decreases and the yarn becomes thinner when stretched, so that the elongation at break of the yarn increases. In general, within the generally adopted twist coefficient range, the favorable factors outweigh the unfavorable factors, so as the twist coefficient increases, the elongation at break of a single yarn increases.
For the twisted strands in the same direction, the influence of the twist coefficient on the elongation at break of the yarn is the same as that of the single yarn. For the counter-twisted strands, when the twist coefficient is small, the twisting of the strands means the untwisting of the single yarn, and the average twist width of the strands decreases with the increase of the twist coefficient, so the breaking elongation of the strands When the twist coefficient reaches a certain value, the average twist width increases with the increase of the twist coefficient, and the elongation at break of the strand also increases.

4.Influence on yarn elasticity

The elasticity of the yarn depends on both the elasticity of the fiber and the yarn structure, and the yarn structure is mainly formed by the twisting of the yarn. For single yarns and twisted strands in the same direction, the twisting makes the yarn structure tight. , the fiber slip decreases, and the stretchability of the fiber increases. In the general twist coefficient range, with the increase of the twist coefficient, the elasticity of the yarn increases.
5.Effect on Yarn Gloss and Hand
For single yarns and twisted strands in the same direction, the twisting makes the fibers on the surface of the yarn inclined, and the surface of the yarn becomes rough, the yarn gloss becomes poor, and the hand feel becomes hard. For anisotropically twisted strands, when the ratio of the strand twist coefficient to the single yarn twist coefficient is equal to 0.707, the outer twist width is zero, and the surface fibers are parallel to the yarn axis. At this time, the strands have the best luster and feel soft.

Zhejiang Tongyou Import & Export Co., Ltd. was registered in January 2018 and is located in Taozhu Street, Zhuji City, Zhejiang Province, The company mainly deals in nylon, polyester and other textile raw materials, as well as a series of products such as double twister, winder, wire supporter, shaking machine and various textile machinery. We can provide various specifications of high-quality raw materials and textile equipment for cotton socks, stockings, seamless underwear, gloves, clothing, etc.

One of the parent companies, Zhuji Feihu Textile Machinery Co., Ltd., was founded in 1995, specializing in the production of various textile machinery such as twisting machineswinders,  yarn expanders, Yarn-color-sample-card-machine and hanks.  With more than 20 years of production service experience, professional production equipment assembly line, professional production technology and skilled industrial workers. Since the product was put into the market, it has won unanimous praise from textile, knitting, yarn, printing and dyeing and other related enterprises. We have established in-depth strategic co-leasing alliances with nylon, polyester and other production suppliers and domestic large-scale textile machinery and equipment manufacturers to jointly promote the research and development of new products, and have a good reputation in the industry.Over the years, the company's products have been sold well in Zhejiang, Jiangsu, Guangdong, Shanghai, Fujian, and other large domestic knitting and textile markets, and exported to Europe, America, Southeast Asia and other countries, and has established multiple offices in Southeast Asia to be responsible for product after-sales. Related Services.


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