Through long-term observation and analysis, there are two main forms of end-breakage in rotor spinning. One is breakage before yarn is formed, which mostly occurs at the yarn stripping point in the rotor. Common ones include thin tail breakage, impurity breakage, and thick section breakage. The breakage is mainly caused by the strong weak loops in the yarn during the fiber cohesion and merging process. The other is yarn breakage after the yarn is formed, mainly due to excessive winding tension or the yarn being stuck in the groove of the rubber roller. The influencing factors and solutions to end-breakage in rotor spinning are as follows.
(1) Raw material factors. In order to facilitate production, our company’s rotor spinning 28tex uses the same cotton blend as the rotor spinning 59tex. The raw material contains high impurities, high short lint, and high yarn breakage. In order to reduce end breakage and optimize the cotton mix, the proportion of fine lint cotton broken seeds was adjusted from 60% to 54.5%, the fine lint cotton fine noil was adjusted from 23.7% to 23.4%, and the long staple cotton broken seeds were increased by 15.6%. After removing the four categories of reuse, the return pattern increased from 6.3% to 6.7%. After adjusting the cotton mix, the yarn strength increased from 265cN to 276cN, and the number of broken ends per thousand spindles decreased from 153 to 126.
(2) Temperature and humidity factors. Because the rotor spinning workshop is large, the temperature and humidity control is unreasonable, with low temperature and low humidity. Separate a workshop and add a humidifier for humidification. At the same time, each process of pre-spinning is humidified to increase the moisture regain of rotor spinning (from 6.5% to 7.5%) and keep the relative humidity of the workshop stable, which significantly improves the performance of rotor spinning. End breakage in cup spinning is reduced from 153 to 132 ends per thousand spindles.
(3) Equipment factors. Configure a micro-dust collector in the cleaning process and appropriately increase the amount of dust removal; appropriately speed up the cleaning and mixing machine to increase the amount of waste and improve the efficiency of impurity removal; replace damaged card clothing in a timely manner during the carding process to remove as much waste as possible to eliminate impurities. After passing the above measures, the impurity content of cotton rolls was reduced from 5.0% to 4.0%, and the number of ends broken down was reduced from 132 to 112 pieces per thousand spindles.
(4) Operational factors. Increase the intensity of catching defects in each process to remove regular defects in the cotton sliver in a timely manner. At the same time, increase the intensity of cleaning to reduce the attachment of flying particles. Establish a cleaning cycle for the rotor to ensure that there is no dust in the rotor and that the air supply openings and channels of the spinning machine are kept clear. By taking the above series of measures, the end-breakage level of rotor spinning 28tex has been significantly improved, and the product quality has also been significantly improved. </p
