How to deal with quality problems in spinning?(4/6)
4 hairiness
(1) the main process of generating hairiness is spinning. There are two places that have the most influence on generating hairiness on spinning frame. The first is the spinning triangle area, which is the spinning triangle area between the whiskers led from the front roller jaw and the twisting point. According to foreign reports, the spinning hairiness produced in the triangle area accounts for 80% - 85% of the total yarn hairiness, and more than 80% of the flying flowers in the spinning workshop are produced in the spinning triangle area; the second is the winding part.
(2) with the emergence of compact spinning technology, the spinning triangle area is basically eliminated, so the yarn hairiness is very few and the body is as smooth as silk, which basically solves the problem of yarn hairiness in spinning production.
(3) the ring and steel ring in the twisting part of the spinning frame are also the parts producing spinning hairiness. The service life of most domestic programs and steel rings is very low. The service life of the ring is only 9 months, and the service life of the steel coil is only one week. Because the ring and steel ring are not matched and the stability period is too short, the warp tension is very unstable, especially in the spinning production, the spinning tension of large and small yarns is larger, which will not be produced once In recent years, after the revolution of materials and processing technology, the service life of steel rings in China has been increased to 3-5 years, and the service life of steel rings has also been improved, such as fluorine plated steel rings.
Generally, steel rings are produced in foreign countries. The shape of the rings and rings is well designed, the service life is prolonged, and the matching quality is improved. For example, the matching condition of steel rings and rings in Brooke, Switzerland is very good, the contact surface between them is enlarged, the heat dissipation effect is good, and the service life is prolonged. According to the experience of the factory, the matching condition of the rings and rings is significant Reduce hairiness.
(4) the rollers, cots, aprons, guide hooks, up and down pins and collectors in the spinning parts all play a certain role in reducing the hairiness. How to reduce the spinning triangle area as much as possible without tight spinning technology is also a positive measure.
(5) the motor of the new spinning frame can be divided into 10 levels according to the spinning process from small yarn to large spindle speed, so as to control the same spinning tension and stabilize the spinning tension to reduce the hairiness of large and small yarns.
(6) yarn hairiness is very related to the efficiency improvement of air-jet looms. According to the investigation, when air-jet looms use ordinary ring spun yarn, the warp and weft stop contract caused by hairiness accounts for 2 / 3, so the problem of hairiness should be paid special attention to.
(7) due to the uneven distribution of hairiness and large ingot difference, the fabric will have the crossbar dyeing defects caused by hairiness.
(8) the automatic winder has realized the automatic control of the unwinding tension from large yarn to small yarn and the same winding tension of winder, and also has a positive effect on reducing the hairiness produced during the unwinding of tube yarn.
(9) the effect of winder on the increase of hairiness is aimed at the situation that there are more hairiness in common ring spun yarn, and the continuous deterioration makes the hairiness increase significantly, but it does not include the yarn with less hairiness in compact spinning. For compact ring spun yarn, the winder will not have an impact on the increase of hairiness in spinning.
(10) in the new spinning system, there is basically no spinning triangle area, ring and coil twisting system, so the hairiness of air-jet spinning, vortex spinning and rotor spinning is less than that of ordinary ring spinning.
