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According to the manufacturer of pure cotton yarns, the factors affecting the strength and elongation of the yarn are mainly the two aspects of the fiber properties and yarn structure of the yarn. The strength and elongation of the blended yarn are also different from those of the blended fiber and the blending ratio. Closely related, the external factors such as temperature, humidity and strength test conditions have the same effect on the strength and elongation of the yarn.
1, fiber properties (1) fiber length, linear density:
When the fiber length is long and the fiber is fine, the frictional resistance between the fibers in the yarn is large, and it is not easy to slip off, so the yarn strength is high. When the fiber length is good and the fiber is fine and uniform, the yarn is evenly dried, and the weak ring is less and not significant, which is beneficial to the improvement of the yarn strength.
(2) Fiber strength:
When the strength and elongation of the fiber are large, the strength and elongation of the yarn are also large; the fiber strength and the unevenness of the elongation are small, and the yarn strength is high.
(3) Surface friction properties of the fiber:
When the friction coefficient μ of the fiber surface increases, the sliding resistance between the fibers is large, the slip length lc is decreased, the proportion of the number of slip fibers is decreased, and the yarn forming strength is increased. Increasing the number of crimps of the fibers increases the sliding resistance between the fibers.
2. Yarn structure (1) The influence of the structure of the short fiber yarn on its strength and elongation is mainly reflected in the twist.
When the twist coefficient increases, the frictional resistance between the wood fibers increases, which is not easy to slip off. This is a strong positive side for the strength of the short fiber yarn, but as the twist coefficient increases, the fiber tends to become larger and larger, and the fiber strength increases. The effective component force in the axial direction of the yarn is reduced, and the fiber breakage in the yarn is not uniform at the same time, and the increase in the yarn diameter when the fiber is inclined is an unfavorable factor for the relative strength of the yarn.
(2) The influence of the plying on the single yarn and the cooperation make the strands dry and uniform, and there is contact between the single yarns, so that the cohesion between the outer fibers of the single yarn increases; the strength of the strands is greater than the sum of the strengths of the individual yarns.
(3) Arrangement of fibers in spun yarns The strength of the rotor yarn is lower than that of the ring yarn: in the rotor yarn, there are more irregularly arranged fibers, such as folding, curling, and ringing, and less normal transfer fibers, resulting in fibers and The fiber is in poor contact and slips off during stretching.
Analysis of Factors Affecting the Strength of Pure Cotton Yarn
What is the strength of pure cotton yarn? What are the influencing factors? The following cotton yarn manufacturers Xiaobian will analyze it: