The key factors to improve the quality of cluster spinning

1　　The exhaust air volume of the negative pressure fan and the negative pressure of the negative pressure tube 　　The size of the negative pressure of the negative pressure tube is the most direct and most critical factor affecting the quality of the concentrated spinning yarn. The accumulation of flowers in the air box of the negative pressure fan is also a key factor that affects the negative pressure of the negative pressure pipe. In daily production, the accumulation of flowers in the air box must be cleaned up in time to keep the negative pressure stable.　　According to actual test and production, it is found that the negative pressure of agglomeration spinning needs to be maintained at 2.4kPa～3.0kPa. Too low negative pressure will increase the rate of broken ends, increase hairiness, long hairiness length, and large hairiness unevenness. According to actual measurements, under the same temperature and humidity conditions, when the negative pressure is between 2.4 kPa and 2.7 kPa, the difference between the front and rear negative pressure is about 0.15 kPa to 0.35 kPa, and the hairiness difference is about 30%.　　Production practice has proved that the 888-spinning frame can choose a negative pressure fan above 4.2 kW, and appropriately increasing the speed of the negative pressure fan can reduce the negative pressure difference between the front and the rear of the car, and minimize the impact of the negative pressure on the yarn quality. Every time the car is turned on, the negative pressure fan can be turned on to suck out the accumulated flowers in the negative pressure air duct and clean up. 2　　The movement state of the whisker on the negative pressure tube The movement state of the whisker on the negative pressure tube is an extremely important factor that affects the yarn evenness. When the negative pressure is normal, the whisker transfers to the negative pressure on the roller During the process of on the tube and the process of moving on the negative pressure tube, the whiskers move in a relatively straight and continuously condensed state. However, due to certain factors, the motion state of the whiskers will change: such as the whiskers shaking, jumping, shaking, and uneven thickness. In actual production, due to the excessive pressure of the cradle, the accumulation of static electricity, the poor surface of the rubber roller, the small negative pressure of the negative pressure tube and other factors, the whiskers fall or skew left and right in the 'uncontrolled zone' between the roller and the negative pressure tube. This phenomenon will cause the yarn evenness to be significantly affected. Therefore, the pressure of the cradle of the agglomeration spinning should be controlled to be too small to prevent electrostatic accumulation, maintain the surface smoothness of the roller and rubber roller, prevent entanglement, and keep the negative pressure of the negative pressure tube normal. At the same time, try to choose an antistatic grid circle, and choose a grid circle with a reasonable number of meshes. 3　　The influence of workshop temperature and humidity In the process of agglomeration spinning, due to the effect of suction and exhaust, the workshop temperature will have obvious unevenness at the front and rear of the car. This unevenness will show seasonal differences. The temperature difference in winter is about 2℃～ 4℃, and about 3℃～6℃ in summer.　　 Temperature and humidity are an important factor affecting hairiness. According to actual measurement, the number of hairiness and neps on the rear of the car is about 40% higher than that of the front. Therefore, maintaining the normal temperature and humidity in the workshop and reducing the temperature and humidity difference is an important measure to improve product quality.　　4　　 cradle pressure 　 　 cradle pressure directly affects the quality of the yarn. Excessive cradle pressure can easily shorten the service life of the front rubber roller, cause the front rubber roller to be concave, and may also cause mechanical waves of the rubber roller.　　The normal service life of the front rubber roller is about 2 months. When the pressure is too high, it will be weak to hold the roving after one and a half months of use, resulting in a rapid increase in end breakage. Therefore, the pressure of the cradle of the cluster spinning should not be too large, and it is generally appropriate to control it at 160 N/double spindle to 180 N/double spindle.　　5　　The effect of spinning process on yarn quality　　Floating area is a key factor affecting yarn quality. The size of the floating area should be the same, the position of the pressure bar should be appropriate, and the phenomenon of rollers before the pressure bar grinding and long aprons should not occur. If the position of the pressure bar is too large, the floating area will be too large, the fiber cannot be effectively controlled, and the apron may even be worn. If the position of the pressure bar is too far, it will cause the roving to 'run up' phenomenon, and the pressure bar cannot be used. If the pressure rod grinds the front roller, it will also cause the roller mechanical wave to appear. In production, the front punch of the rubber roller is preferably about 2 mm to 3 mm, and the maximum shall not exceed 3 mm. If the front punch is too large, it is easy to form an anti-enclosure arc, which will reduce the quality of the yarn and increase the broken ends. . Excessively large floating area of u200bu200bthe concentrated spinning can also easily cause the big rubber roller of the front rubber roller to press the grid ring. When the whisker moves to both sides of the yarn guide stroke, the whisker sways left and right at the suction groove, which affects the yarn quality.　　 Reasonable draft distribution is also an important factor to improve yarn quality. When selecting the drafting ratio, one cannot blindly pursue good yarn evenness and neps. As the drafting ratio continues to increase, the unevenness of the long and medium segments of the yarn will also increase.　　 In the selection of agglomerated spinning process, in addition to the critical draft ratio, the rear draft ratio can be appropriately increased, and the spindle speed can be appropriately increased, thereby increasing the yarn output and improving the efficiency.　　 The optimization of the yarn quality of the cluster spinning is a complex project, and the factors that affect the yarn quality are also complex and diverse. Therefore, it is necessary to consider all aspects when optimizing yarn quality in order to obtain the best yarn quality. Article Keywords: 　Spinning Yarn