Due to the high running speed of the winder, the spun yarn is prone to unwinding during unwinding. During the winding process, we found that the yarn path of the anti-hairiness nozzle of some single spindle tension boxes and the wax suction port are near The phenomenon of back wire jamming still occurs frequently after cleaning, and this phenomenon often appears in a random form. Based on this, we can conclude that this phenomenon is caused by the spinning of spun bobbins. The yarn layer de-looped during winding passes through the pre-clearer along with the high-speed yarn, passes over the yarn guide plate of the tension box, is cut by electric clearing, and is wound on the bobbin with the inertia of the upper yarn. In the process of repeatedly finding the yarn, the large suction nozzle may extract a yarn from the chaotic yarn cluster, pass the electrical clear detection, and continue the winding after splicing with the lower yarn, so the yarn is formed in the bobbin yarn.
Solving method of spinning bobbins
If the spun bobbins of all the machines are out of loop, it is likely that the spun yarn forming process is configured. Because the spun bobbins are all conical cross-wound, the winding layer and the binding layer alternate with each other, and the ring plate moves up and down The speed and stroke size will have a great impact on the spinning of the spun yarn.
Generally, in the spinning process, the cam lifting ratio is 1:2, and the movement of the ring plate when winding the body is 46 mm, (the diameter of the ring is 42 mm, the maximum diameter of the bobbin is 39 mm, and the ring plate The value of the lifting stroke L is about 46 mm), combined with the design of the textile winding density, the general yarn winding pitch is designed according to 6 to 7 times the diameter of the yarn, which can largely solve the spinning tube The phenomenon of yarn de-looping. In addition, if the bottom of the tube is too full to increase the capacity of the bobbin, it will also cause the spun bobbin to unwind.
If the individual machine is out of loop, you can find the reason from the wear of the inorganic parts of the forming cam transmission part and whether the key is loose. Some machines are worn by the worm gear mechanism or the gear box is loose. In addition, check whether the ring plate rises and falls during operation. The phenomenon of frustration, these are the main reasons for the spun yarn bobbins.
Due to the high speed during winding, the thick yarn is more likely to de-loop, and the mid-stop is also one of the reasons for the de-loop. Therefore, the parking position of the ring plate in the mid-stop should be adjusted. Upper middle.
The operation management of some factories will reduce the number of doffing of coarse size yarn, and will change the process of the forming part on the car without authorization, reduce the starting position of the ring plate, and increase the weight of the bobbin. Out of loop.
In the spinning process, the yarn end is not coiled when the traveler is replaced, the head is raised during doffing, or the low-speed running time after the birth is too long, and the structure of the yarn winding layer is not tight, these are some of the reasons that cause the yarn to deloop .
In addition, the surface of the bottom of the spun bobbin used earlier was too smooth or the surface processing groove was too shallow, which caused the innermost layer of the spun bobbin to deloop.
