Effect on yarn elongation at break
For single yarns, twisting reduces the possibility of fiber slippage in the spinning yarn and increases fiber elongation and deformation, which is manifested as a decrease in the elongation at break of the spinning yarn. However, as the twist coefficient increases, the degree of inclination of the fiber in the yarn increases. When stretched, the degree of inclination of the fiber decreases and the spinning yarn becomes thinner, thereby increasing the elongation at break of the spinning yarn. Generally speaking, within the generally adopted range of twist coefficient, the favorable factors outweigh the unfavorable factors, so as the twist coefficient increases, the elongation at break of single yarn increases. For strands twisted in the same direction, the effect of the twist coefficient on the elongation at break of the spun yarn is the same as that of single yarn. For strands twisted in different directions, when the twist coefficient is small, the twisting of the strand means the untwisting of the single yarn. The average twist amplitude of the strand decreases with the increase of the twist coefficient, so the breaking elongation of the strand The rate decreases slightly. When the twist coefficient reaches a certain value, the average twist amplitude increases as the twist coefficient increases, and the breaking elongation of the strands also increases. (4) Effect on the elasticity of spinning yarn The elasticity of spinning yarn depends on both the elasticity of the fiber and the structure of the spinning yarn. The structure of the spinning yarn is mainly formed by the twisting of the spinning yarn. For single yarn and co-directional twisting, For twisted strands, twisting makes the yarn structure tight, fiber slippage is reduced, and fiber stretchability is increased. Within the general twist coefficient range, as the twist coefficient increases, the elasticity of the yarn increases. (5) Effect on the finish and feel of the spinning yarn. For single yarns and strands twisted in the same direction, the twisting causes the fibers on the surface of the spinning yarn to tilt and makes the surface of the spinning yarn rough and uneven. The spinning yarn is not perfect. The luster becomes worse and the feel becomes harder. For twisted strands in different directions, 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 axis of the spinning yarn. At this time, the strands have good integrity and feel. soft.
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