In order to further reduce production costs and maximize equipment utilization, the spinning equipment of each textile enterprise is closely matched before and after, and there is no redundancy and spare, especially the automatic winder. In this case, it is particularly important to improve the actual production efficiency of the automatic winder, which directly determines whether it can digest the output of the spun yarn and further increase the efficiency and output of the spinning machine. There are many factors that affect the production efficiency of the automatic winder. The quality of the bobbin, the environment temperature and humidity, the operation, the process, and the equipment should all pay sufficient attention.
The quality of bobbin is an important factor affecting the production efficiency of the winder. The bobbin quality here includes a wide range, including not only the intrinsic quality of sliver CV value, coarse details, number deviation, periodic yarn defects, foreign fibers, hairiness, etc., but also the winding quality.
Tube sliver dry CV value and coarse detail control
The yarn CV value and coarse details are related to the raw materials and the equipment, processes and operations of each process. Good equipment conditions, reasonable process parameters, excellent process components, and high operating levels are the guarantee of reducing the CV value of the tube sliver and reducing the coarse details. Under normal production conditions, S (short thick knot) accounts for the largest proportion of yarn defects cut by the automatic winder, accounting for about 40% of the total cut yarn defects; followed by N (very thick cross section and short length) Thick knots), accounting for about 30% of the total shear yarn defects. Most of these two types of yarn defects are caused by poor cleaning of the sliver channel or fly-in in the spinning process. Therefore, it is very important to clean the various processes and machines. At present, the carding and drawing frames are both high-speed and high-yield types. In a short time, the sliver channel and the machine table will be full of dust and dirt. The cleaning cycle must be greatly shortened to ensure that the sliver channel and machine surface are clean.
Tube yarn number deviation control
The number deviation refers to the thicker or thinner long segments with a length of at least 2 m, which is mainly related to the quantitative determination of cooked slivers. The traditional method of quantitative test cycle for cooked slivers is to test 3 times in each shift (8 h), with an average interval of 2.5 h. This test cycle is no longer applicable to current draw frames. The current draw frame draw speed is 350 m / min ～ 500 m / min, or even higher, which is more than twice the draw speed of the traditional draw frame, so the test period must be shortened. We use an hourly test to strictly control the ration of cooked slivers within the range of ± 0.9%. The quantitative difference of cooked slivers of different machines of the same variety is as small as possible to reduce uneven weight of cooked slivers. If the quantitative difference between the two eyes of the same car is greater than 1.5%, ask the block operator to change the tampon behind the two eyes, and then repeat the test until the quantitative difference between the two eyes is small. In addition, it is necessary to improve the operation level of blockers, increase their awareness of quality control, judge the thickness of sliver by hand and other methods, and strictly control the sliver and sliver in the two processes of drawing and roving to prevent it from flowing into the next process.
Periodic yarn defect and hairiness control
Periodic yarn defects and hairiness are mainly caused by the spinning process. It is an effective measure to reduce periodic yarn defects by maintaining the good mechanical condition of the drafting components such as rollers, rubber rollers, gears, aprons, and aprons. Reasonable selection of rings and travellers, improving the surface roughness of winding components such as yarn guides, and improving the smoothness of spindle and bobbin rotation are all conducive to reducing hairiness.
Foreign fiber control
Foreign fibers are related to raw materials. In addition to using raw materials with low foreign fiber content, various processes must strengthen foreign fiber control. It should be noted that do not use colored ropes or plastic ropes when opening the cotton back to the flower bag. Try to use the same raw materials as the spun yarn.
Winding quality of bobbin
是否 Whether the formation of the bobbin is good, the winding quality such as the length of the bobbin tail will affect the production efficiency of the winder. During the spinning process of the tube yarn, try to avoid the occurrence of bad winding conditions such as gourd yarn, grinding yarn, and looping yarn, and do not spin too much. At least 2 cells should be left. The length of the yarn tail should not exceed 1 cm. When the yarn is doffing, do not stop while the ring plate is swinging upwards, or even at the top position, so as to avoid the end break when winding on the winder to the start position of the bobbin.
Tube yarn regain rate and workshop temperature and humidity control
For cotton yarns, the bobbin yarn has a high moisture regain, less spun yarn ends, and fewer flying flowers, but it will greatly increase the CV value and the number of yarn defects detected by the capacitor electronic yarn clearer of the winder. Production efficiency is greatly reduced. The 100,000-meter yarn defect statistics and the event analysis report show that more yarn defects and end breaks are due to the positive number deviation. Through laboratory inspection, the number of frequently cut yarns is normal or slightly thicker, and does not exceed the standard. For tube yarns with too much moisture regain, we generally place them in a ventilated and dry place for about 12 hours before winding. If the humidity in the workshop is too high, the sensitivity of the capacitive electronic yarn clearer will be greatly improved, and invisible yarn defects will also be cut, which seriously affects the production efficiency. Too much dampness of the bobbin or too much humidity in the workshop will reduce the production efficiency of the winder by 10% to 20%, so it must be strictly controlled. Generally, it is appropriate to control the humidity in the winding workshop at 55% to 65%. Once it exceeds 70%, the number of shears will increase significantly. The moisture regain of fine cotton yarns should not exceed 8.0%.
Improving the production efficiency of the winder is not only a matter of the winding process. Each process and each department should do its best to improve the product quality, reduce tube defects, and stabilize the temperature and humidity in the workshop. The winding process should strengthen the training of operating skills of blockers, reasonably set the winding process parameters, and comprehensively improve the production efficiency of the winding machine.
