The Art And Science Behind Double-Layer Covered Yarn
Nov 28, 2023
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Double-layer covered yarn is a yarn composed of two layers of different fibers, one layer is the inner core yarn, and the other is the outer yarn. The outer yarn is tightly wrapped around the inner core yarn through the winding process to form A yarn with special properties and uses. The breaking strength of double-layer covered yarn refers to the maximum tensile force that the yarn can withstand. It is affected by factors such as the material, structure, linear density, and draft rate of the inner core yarn and outer yarn. Among them, twist is an important factor.
Twist refers to the number of twists of a yarn per unit length. It reflects the degree of twisting of the yarn and affects its strength, elasticity, softness, gloss and other properties. The amount of twist depends on the parameters of the winding process, such as winding speed, draft speed, winding rate, etc. The winding rate refers to the ratio of the winding speed to the drafting speed. It reflects the winding density of the outer covering yarn on the inner core yarn and affects the breaking strength of the double-layer covering yarn.
Generally speaking, the breaking strength of double-layer covered yarn increases with the increase of twist. This is because the increase of twist can increase the friction between fibers, improve the fastness of the yarn, and reduce the possibility of fiber slippage and breakage. However, the increase in twist will also cause the linear density of the yarn to increase, the elasticity and softness of the yarn to decrease, and the surface roughness of the yarn to increase, affecting the appearance and feel of the yarn. Therefore, the twist cannot be increased without limit, but an appropriate twist range should be selected according to different fiber materials and uses to achieve the best balance of breaking strength and other properties.
In addition, the breaking strength of double-layer covered yarn is also affected by the winding rate. If the winding rate is too high or too low, the breaking strength will be reduced. Excessively high winding rate will cause the outer yarn to be wound tightly on the inner core yarn, so that the strength of the inner core yarn cannot be fully exerted, and the strength of the outer yarn will also be reduced due to excessive stretching. If the winding rate is too low, the outer yarn will be loosely wound on the inner core yarn, so that the outer yarn cannot be tightly wound on the inner core yarn, and the strength of the outer yarn will also be reduced due to the lack of sufficient friction. Therefore, the winding rate should also choose an appropriate winding rate range according to different fiber materials and uses to achieve the best balance of breaking strength and other properties.
To sum up, twist has an important influence on the breaking strength of double-layer covered yarn, but other factors should also be taken into consideration, such as winding rate, fiber material, linear density, etc., and the influence of various factors should be comprehensively considered to choose Reasonable process parameters to improve the breaking strength and other properties of double-layer covered yarn to meet different uses and needs.
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YANGLONG TEXTILE CO.,LTD was established in 2008 and was rated as a technology company in 2019. The factory located in "SOCKS CAPITAL" City-ZHUJI, DATANG, ZHEJIANG, CHINA. Yanglong is famous with its main production: Imitated nylon yarn (fake nylon yarn), Polyester High Stretch Yarn, Reflective yarn, Luminous yarn, Reflective Yarn, Spandex Covered Yarn, Elastic Yarn. Our productions are high-elasticity, environmentally dyeing, strong elasticity, bright colors. The color difference is small, touch feeling soft.
