The longer the length of the fiber in the spinning material, the less the corresponding yarn hairiness. When the fiber is thick, the yarn hairiness is more; The maturity and uniformity of raw cotton yarn hairiness are less.
A good semi-finished structure is that the separation degree, parallel straightness, short fiber content, and less NEP impurities interfere with the movement of the fiber are good for the control of fiber movement by the spinning drafting device, thus reducing hairiness. The short down that clean cotton, carding and combing drop cotton is more, the fiber in the raw strip is neat, the straightness and parallelism are good, and the hairiness is also less.
The hairiness of yarn decreases with the increase of twist. It is helpful to prevent the excessive diffusion of fibers and reduce hairiness by properly improving the roving twist coefficient, enlarging the central distance of roller in the rear area of the yarn, reducing the drawing ratio of the rear area, leaving the strip with a certain twist back and entering the front drawing area.
The increase of ingot speed increases the contact pressure between yarn and wire ring and guide hook, and the friction increases, and the speed of wire ring increases, which makes the wire ring run unstable, and the centrifugal force of yarn increases, which makes the fiber easily shed from the yarn to form hairiness. Especially when the ingot speed reaches 17000r / min, the spindle speed is increased again, and the hairiness increases sharply. When spinning fine yarn, the spindle speed increases by 1% and the hairiness increases by 4-5%; When spinning coarse yarn, the spindle speed increases by 1%, and hairiness increases by 6-8%.
When the yarn adopts a small spacer, the width of the cross-section of the strip can be reduced, the diffusion degree of the fiber is reduced, and the yarn is twisted in a closed state, thus reducing the hairiness.
The number of hairiness increases with the heavy and light steel wire ring, and the yarn breakage also increases. When the coil is too heavy, the tension increases, the wire ring is easy to wear, making the yarn channel blocked and the yarn strip is easy to scrape, so the hairiness is much. When the wire ring is large, the yarn channel is smooth, and the yarn is not easy to be scratched, so the hairiness is less. The circular section steel wire ring of the steel wire ring is easy to heat, but it is unstable in operation, so it has much hairiness; The cross-sectional area of rectangular section steel wire ring is large, easy to heat dissipation and stable operation, so it is conducive to reduce hairiness. The wire ring has more hairiness on the first to the second day of the ripening period. In the stable period, hairiness decreased significantly in 3-9 days than in the first two days; In the decline period, hairiness increased significantly in 10-16 days.
When the diameter of the collar is large, the hairiness is much; On the contrary, the diameter of the collar is small, and the yarn hairiness is less. The width of the collar has less hairiness than the narrow one. When the steel collar is mature, there is much hairiness; In the stable period, the hairiness is less; In the recession, hairiness increased again. The taper steel collar has less hairiness than the flat steel collar.
The use of a suitable cotton collector is conducive to reducing yarn hairiness. When using a cotton collector, operation management must be strengthened, and yarn defects will be increased if improper use is used.
The proper increase of the front impulse of the spinning front roller can reduce the arc of the strip on the front roller, make the twisting moment closer to the front roller jaw, thus reducing the twisting triangle area so that the hairiness can be reduced.
Under the condition of satisfying the customer’s requirements, the twist coefficient of yarn should be improved properly to reduce the yarn hairiness. Because the yarn has a small twist coefficient, the yarn density on the fiber is weakened, which makes the yarn easily produce hairiness in the process. The twist coefficient is too large, which will make the yarn feel hard and the yarn production will be reduced. Therefore, we must consider the quality and production efficiency of the yarn, and increase the twist coefficient appropriately to reduce the yarn hairiness.
Timely replace the guide hook of the worn groove and the yarn separator plate with a rough surface.
Ensure that the three concentric guide hooks of the steel collar spindle reduce yarn hairiness.
Eliminate shaking spindle and crooked spindle.
Gradually promote and use the control ring of the gas ring. The control ring of the air ring divides the larger air ring into two smaller rings and can maintain a stable and normal gas graph shape under the small spinning tension, thus reducing the collision friction degree and frequency between the air ring and the yarn separator plate, and obviously reducing the yarn hairiness.
