The main factors affecting the internal and external transfer of fibers in yarn
1. Fiber Length Long fibers tend to migrate inwards. Because long fibers are easily held by both ends of the twisting triangle area at the same time, the force Tf experienced by the fiber in the yarn is larger, and the centripetal pressure is also larger, so it is easy to transfer inward. On the contrary, short fibers are not easy to be held by the two ends of the twisting triangle. The force Tf the fiber receives in the yarn is smaller, and the centripetal pressure is also smaller, so it is easy to be distributed on the outer layer of the yarn. 2. Fiber fineness: Fine fibers tend to migrate inwards. Because the bending stiffness of fine fibers is small, simple bending will cause large deformation, which will cause the fibers to bear greater force and centripetal pressure. At the same time, the cross-sectional area of the fine fibers is small, and the resistance from the surrounding fibers is small when moving inward. Therefore, it is easy to transfer inward and be distributed in the inner layer of the yarn. Thick fibers are not easy to bend, have small centripetal pressure, and are easily distributed on the outer layer of the yarn due to the large friction force from the surrounding fibers. 3. The initial modulus of the fiber is large, which indicates that the stress generated by the fiber during small deformation is large, the centripetal pressure is large, and it is easy to transfer inward. 4. Cross-sectional shape: Circular cross-section fibers have low bending stiffness, are easy to bend, and have low leisure resistance, so circular cross-section fibers are easy to distribute in the inner layer of the yarn. The special-shaped cross-section fibers have high bending stiffness, are not easy to bend, and have small centripetal pressure, so they are not easy to transfer inward and are distributed in the outer layer of the yarn. 5. Friction factor The effect of friction factor on fiber transfer is complex. Generally speaking, fibers with high friction factors are not easy to migrate inwards. 6. Fiber curl Fibers with less curl are easily distributed in the inner layer of the yarn. Under the same elongation condition, fibers with less curl generate greater tension and centripetal force when stretched, and are prone to inward transfer. 7. Fiber resolution: If the fibers are poorly carded and there are fiber bundles, it will not only affect the evenness, but also fluctuate in the radial distribution due to group transfer, and even affect the color distribution of the dyed yarn. 8. Spinning tension: As the spinning tension increases, the deformation of the fiber also increases, causing the centripetal pressure to increase and the internal and external transfer to intensify. 9. Twist: As the twist increases, the fiber stays in the twisting triangle zone for a longer period of time, and the degree of internal and external transfer increases. The twisting triangle is the decisive factor in producing internal and external transfer. Using the above rules, by manipulating the physical properties of the fibers in the blended chemical fiber fabric yarn, the expected internal and external distribution effects can be obtained. For example, for polyester-cotton blended chemical fiber fabric yarn, if you want the yarn to feel smooth and have good wear resistance, choose polyester fiber that is thicker and shorter than cotton so that the polyester is distributed in the outer layer of the yarn; if you want to spin the yarn to be cotton If you have a strong sense of style and good moisture absorption ability, choose thinner and longer cotton fibers so that the cotton is distributed in the outer layer of the yarn.
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