How does twisting affect the strength of nylon yarn

In the field of textile industry, nylon yarn is widely used in a variety of textiles due to its excellent wear resistance, high strength and excellent elasticity. However, the characteristics of nylon fiber itself are not enough to meet the higher strength requirements of certain specific application scenarios. In this case, twisting, as a key textile process, has become an important means to improve the strength of nylon yarn.

Basic concept and purpose of twisting
Twisting refers to the rotation of yarn to generate a certain torque between fibers, thereby promoting a tighter combination of fibers. This process significantly changes the internal structure of the yarn, making the fibers more parallel and evenly distributed. The main purpose of twisting is to enhance the strength and wear resistance of the yarn, while improving its feel, gloss and elasticity.

Mechanism of twisting to improve the strength of nylon yarn
Tight bonding between fibers: During twisting, the friction between fibers increases due to the action of torque. The increase in friction promotes the close bonding of fibers inside the yarn, reduces the gaps between fibers, and increases the overall density of the yarn. This tight fiber structure makes it difficult for the yarn to slip and break when it is subjected to external forces, thereby significantly improving the strength of the yarn.
Uniform distribution of fibers: During the twisting process, the distribution of fibers inside the yarn tends to be uniform. This uniformity helps to reduce the stress concentration phenomenon inside the yarn, so that the yarn can more evenly disperse the load when subjected to external forces, thereby improving the overall strength.
Axial arrangement of fibers: Twisting makes the fibers more neatly arranged along the axial direction inside the yarn. This arrangement helps to improve the axial tensile strength of the yarn, so that the yarn can more effectively resist deformation and breakage when subjected to axial tension.

Effect of twisting degree on strength
It is worth noting that the higher the twisting degree, the better. Excessive twisting will cause the yarn to become too tight and stiff, and reduce its ductility and softness. This situation will not only affect the comfort of the yarn, but may even cause the yarn to break brittlely when subjected to large external forces in some cases. Therefore, in practical applications, it is particularly important to choose an appropriate twisting degree according to the specific requirements and process conditions of the product.
Generally, moderate twisting can significantly improve the strength of nylon yarn, while excessive twisting may lead to a decrease in strength. During the twisting process, the degree and direction of twisting must be strictly controlled to ensure that the yarn performance reaches the best state.