Rotor spinning is one of the open-end spinning methods. It is called rotor spinning because it uses a rotor to condense single fibers. At the beginning, air flow was mainly used, which is also called air spinning in China.
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.
Raw material factors
The raw materials contain high impurities, high lint, and high yarn breaks. In order to reduce end breakage and optimize the cotton mix, the proportion of fine-staple cotton used in the cotton mix is adjusted from 60% to 54.5%, and the fine-staple cotton fine noil is adjusted from 23.7% to 23.4%, and the broken seeds of long-staple cotton are increased by 15.6%. , remove the four categories of reuse, and the return pattern increases from 6.3% to 6.7%. After adjusting the cotton mix, the yarn strength increases from 265cN to 276cN, and the number of ends broken down per thousand spindles decreases from 153 to 126.
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.
Equipment factors
Configure a micro-dust collector in the cotton cleaning process, and appropriately increase the dust removal amount; mix the cleaning cotton The speed of the cotton opener should be appropriately increased to increase the amount of waste and improve the efficiency of impurity removal; during the carding process, damaged card clothing should be replaced in a timely manner to remove as much impurities as possible. 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.
Operational factors
Increase the intensity of defect catching in each process, eliminate regular defects in cotton slivers in a timely manner, and at the same time increase Strong cleaning power to reduce the adhesion 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
