Five Key Factors To Help You Improve The Quality Of Compact Spinning

Negative pressure fan discharge volume and negative pressure tube negative pressure

The negative pressure of the negative pressure tube is the most direct and crucial factor affecting the quality of compact yarn. The accumulation of flowers in the bellows of negative pressure fans is also a key factor affecting the negative pressure of negative pressure pipes. In daily production, it is necessary to clean up the bellows and maintain negative pressure stability in time.

According to actual testing and production, compact spinning negative pressure should be kept at 24-30 mbar. Low negative pressure will lead to higher breakage rate, increased hairiness, longer hairiness and larger unevenness of hairiness. According to the measured results, under the same temperature and humidity condition, the negative pressure difference between the front end and the rear end of the vehicle is about 1.5-3.5 mbar when the negative pressure is 24-27 mbar, and the hairiness difference is about 30%. Production practice has proved that 4.2 kW negative pressure fans can be selected for 1008 spindles, and 2.4 kW negative pressure fans can be selected for 512 spindles. Properly increasing the speed of the negative pressure fan can reduce the negative pressure difference between the head and the tail and minimize the effect of the negative pressure difference on the yarn quality. Each time the vehicle is wiped, the negative pressure fan is opened, and the accumulated flowers accumulated in the negative pressure air duct are sucked out and cleaned.

Motion state of whisker on negative pressure pipe

The movement of the whisker on the negative pressure tube is a very important factor that affects the yarn evenness. When the negative pressure is normal, the bar must move in a straight and continuous state when the rollers transfer to the negative pressure tube and move on the negative pressure pipe. However, the motion state of the bar must be affected by some factors.

In actual production, due to the excessive pressure of the cradle, the accumulation of static electricity, the poor surface of the roller, and the small negative pressure of the negative pressure pipe, the phenomenon of falling or skewing in the "no control zone" between the roller and the negative pressure tube will result in the obvious influence on the yarn line. Therefore, the pressure of compact spinning cradle should be small, so as to prevent static electricity accumulation, keep the surface smoothness of roller and roller, prevent entangling and maintain negative pressure of negative pressure tube. At the same time, try to choose antistatic grid ring and choose mesh ring with reasonable mesh number.

Effect of temperature and humidity on workshop

In the process of compact spinning, due to suction and draining, the temperature of the workshop will be obviously uneven at the front and rear of the vehicle. This uneven will show seasonal differences, the temperature difference in winter is about 2-4 degrees, while the summer is about 3-6 degrees Celsius. Temperature and humidity are important factors affecting hairiness. According to actual measurement, the hairiness and NEP number of the tail are about 40% higher than that of the headstock, see Table 1. Therefore, maintaining the normal temperature and humidity of workshop and reducing the difference between temperature and humidity are important measures to improve product quality.

Cradle pressure

Cradle pressure has a direct impact on yarn quality. Too much pressure on the cradle can easily shorten the service life of the front cots, causing the concave of the front cots and the mechanical waves of cots. The normal use period of the front cots is about 2 months. When the pressure is too high, the phenomenon of poor grip on roving will occur for a month and a half, resulting in a rapid increase in breakage. So compact spinning should not be too high pressure, generally controlled in 160-180N/ double spindle is appropriate.

Effect of spinning process on yarn quality

Floating zone is a key factor affecting yarn quality. The size of the floating area should be the same size, the pressure bar position is moderate, and the pressure roller can not appear before the grinding roller and the long leather rim. When the pressure bar is located, the floating area will be too large to control the fiber and even wear the leather apron. When the pressure bar is too high, it will cause roving to run up, and it can not play the role of the pressure bar. If the roller is pulled before the pressure bar, it will also cause the mechanical wave of the roller. In production, it is advisable to punch 2-3mm before the cots, and the maximum should not exceed 3mm. If the former impulse is too large, it will be easy to form an anti encircling arc, resulting in a decrease in yarn quality and an increase in breakage. It is easy for the compact spinning floating area to cause the front cot roller to press the grid ring. When the bar movement moves to the two sides of the guide yarn, the bar must swing around the suction trough to affect the yarn quality.

Reasonable draft distribution is also an important factor to improve yarn quality. When selecting drafting multiple, we can not simply pursue good yarn evenness and neps. With increasing drafting times, the long segment irregularity will also increase. In the selection of compact spinning process, the drafting ratio of the back zone can be increased appropriately and the spindle speed can be increased beyond the critical drawing ratio, thus increasing the yarn yield and improving the efficiency.

The optimization of yarn quality is a complex project. The factors affecting yarn quality are complex and diverse. Therefore, the yarn quality should be optimized in order to get the best yarn quality.