Tree backing in self-winding yarn is a headache that textile companies often encounter during the production process. The backing of yarn can easily cause yarn breakage during the warping process of the package yarn, seriously affecting the warping efficiency. So what are the causes of silk back? How to reduce silk waste?
1
Cause
01 The large suction nozzle sucks the yarn into chaos to form yarn waste. During warping and unwinding, the entangled yarn is brought up. Since it cannot be unwound, the yarn is pulled off near the surface of the package, causing end breakage and affecting the warping efficiency.
02 Since yarn cutting and yarn breakage occur at the same time, yarn breakage occurs somewhere between the drum and the cleaner. This section is cut The yarn will bounce up and fall to the flat plate above the electric clearer. When the next splicing action of the yarn is completed, when the drum is started, this section of yarn is easily rolled into the drum and becomes yarn waste.
03 Due to the poor strength of the yarn and too many weak links, the tension breakage of the yarn occurs below the splicer, and the yarn bounces up irregularly after breakage. , loosely placed on the small end of the paper tube. When the large suction nozzle is searching for the end, the bobbin is reversed and the yarn on the small end of the paper tube is tightly wrapped around the small end of the paper tube. If the big suction nozzle does not pull off the yarn wrapped around the small end of the paper tube for the first time, then the big suction nozzle will go up to find the end for the second, third or even fourth time. In the process, the yarn wrapped around the small end of the paper tube will be broken. After the yarn is broken, two heads will be produced, one of which is brought down by the large suction nozzle, and is twisted together with the lower yarn head brought up by the small suction nozzle in the splicer. The groove drum is started to complete a splicing process. . During this twisting process or the next twisting process, the waste yarn left on the small end of the paper tube is easily brought into the bobbin to form waste wire, and one end of the waste wire is shallowly attached to the bobbin, while the other end remains Wrap it around the small end of the paper tube.
2 Solutions
01 To solve the problem of messy sucking with large nozzles For yarn problems, we must first ensure the success rate of the large suction nozzle moving upward to find the upper yarn end. Pay attention to the situation in which the large suction nozzle finds the yarn end, and observe all the spindles of all winding machines that produce this type. The success rate of the large suction nozzle in finding the yarn end for the first time must be guaranteed to be above 99%.
02 If it cannot reach above 99%, it can be improved from the following aspects: adjust the distance between the large suction nozzle and the yarn package according to the standard; Check the length, roundness and hardness, and discard those unqualified paper tubes; there are three gears available for the reverse drive of the grooved drum, namely fast, medium and slow. Do tests according to these three conditions to see which one is the best. The end-finding effect is the best. After the drive is determined, the drive acceleration can also be selected. Test different accelerations to select the optimal process for the machine. Secondly, when the success rate of finding the yarn end is guaranteed, Try to set the number of head searches for large suction nozzles to the minimum. Because the more times the large suction nozzle searches for ends, the greater the chance of random yarn suction. If you suck too many times, the yarn on the surface of the package will be sucked into chaos. At the same time, adjust the number of large nozzle movements and splicing times accordingly.
03 To solve the problem of yarn waste in electric cleaners, we can start from three aspects: first, improve the cotton distribution to reduce the strong weak links on the yarn, thereby reducing the contact between the groove drum and the bobbin. Second, strengthen the management of equipment, temperature, humidity, and operations within the production workshop to eliminate the occurrence of occasional yarn defects, optimize the pre-spinning and spinning processes, and reduce the number of yarn cuts for electric cleaners; third , the yarn catching nozzle should be thoroughly cleaned at least every 5 days to ensure that the yarn catching nozzle is not blocked and that yarn waste can be picked up anytime and anywhere.
04 For weak loops, the first step is to reduce the strong weak loops. In the company’s cotton distribution, replace those raw cottons with low single fiber strength and replace them with high strength ones. The raw cotton has significantly improved the minimum strength of the single yarn produced. At the same time, the winding speed can be reduced. When the spinning speed is reduced, the tension generated during the spinning process will be significantly reduced, and the generation of yarn waste can also be reduced.
05 For weak yarn loops, a balloon tracker can be used on the winding single spindle. It can greatly compress the balloon generated when the bobbin is unwound, significantly Reduce the contact area between the yarn and the air, directly reducing the spinning tension to reduce the generation of yarn waste. In addition, when the success rate of finding the yarn end is guaranteed, the process parameters of the automatic winding machine are optimized, the number of failed attempts to find the yarn end is changed to 1, the action of the large suction nozzle is changed to 1, and the “delayed lifting” of the package takes 10 turns. , use 10 circles for “delayed search for upper yarn end” and 1 for the number of splicing failures. The reason why the above process parameters are used is because it is necessary to realize that the waste yarn wound around the small end of the paper tube floats in the air. Before being wound into the bobbin, the single spindle of the automatic winding machine can light up the red light to alarm and stop. , the operator will have the opportunity to pull out the waste yarn wrapped around the small end of the paper tube by rotating the bobbin, thus achieving the purpose of eliminating this type of waste yarn.
3 Operational Points
01 Do “look around and find the head”. Take a look at the spindle foot to see if the bobbin is unlooped or is a “yarn bag”. If it is a bobbin, use the corresponding button on the single spindle to replace the bobbin under the yarn extraction unit. Second, check whether there is wire waste hanging at the small suction nozzle. If so, the operator needs to remove the wire waste. Third, check whether the yarn is hung back at the splicer. If so, clean the yarn.Get rid of it. 4. Check whether there is yarn waste in the yarn clearer channel. If so, find a way to clean it out. “One-time search” means that after a single spindle turns on the red light and the alarm stops, the operator has to use his hand to find the end on the bobbin, instead of directly turning off the red light and starting the production of single spindles. When the operator is looking for the end with his hands, he will look at the left and right sides of the bobbin. If there is any waste wire wrapped around the big and small ends, he must completely withdraw the waste wire.
02 Applying a process such as “delayed search” will have an impact on output. Spinning companies can flexibly decide what kind of process to use based on their own requirements for output and quality, but before the new process is put on the machine, experiments must be done to determine whether it needs to be applied. </p
