--, Harm of bobbin loop
The bobbin unwinding in the winding process not only affects the output, but also reduces the efficiency and increases the labor intensity of the workers. More importantly, it affects the quality of the bobbin yarn.
the amount. The unthreaded bobbin is not ejected, and the suction arm continues to grasp it. It is possible to bring the removed loop back directly without passing through the yarn clearer, and the yellow button is wound on the package without springing.
This will cause a defective tube attached to the loop yarn, and the needle will be broken when it reaches the downstream knitting factory.
Second, the cause analysis and control method of spun yarn
2.1 The influence of the pitch of the bobbin on the looping The bobbin formation is the main cause of the looping, which accounts for over 40% of the influencing factors. In theory, Cheng
The thinner the winding pitch of the inclined surface, the less the number of loops; the denser the thread pitch, the tighter the yarn winding, the easier it is to loop, but it is not absolute, depending on the specific situation. I
The CJ30.7tex yarn currently produced by the company has a lot of loops when it is first made, which not only affects the production efficiency, but also has a great threat to the product quality.
Heart customer complains that the bobbin yarn is attached. By adjusting the forming process, the winding height ZF / ZG was adjusted from 54/68 to 60/62, and the winding pitch was slightly increased.
In addition, the head teeth are adjusted from 45/2 to 53/2, and the full yarn diameter remains unchanged, which does not affect the doffing time, and the bobbin unrolling has been significantly improved.
2.2 The influence of the length of the cone of the spun yarn on the looping is the same as the winding height. The longer the length of the cone of the spun yarn, the thinner the winding pitch, and the less likely the bobbin is to fall off. tube
The length of the yarn cone surface is controlled by the forming cam of the head pan. The FA506 spinning frame of our company has many bobbins when it is first produced, and then it is reprocessed in the machine repair shop.
Shaped cam, changing cam size, significantly reduced tripping.
2.3 The influence of the bottom forming of the small yarn on the unwinding of the bobbin. The bottom forming of the small yarn is also affected by the peach disk forming cam. The principle is the same as the length of the cone surface of the spun yarn.
The slower the degree, the less likely the bobbin will come off.
2.4 Impact of traveler weight on tripping The traveler's weight in the spinning process also has a certain effect on the tube travel of the winding process. Traveler lighter, tube
The yarn is not tightly wound, the hand feels soft after forming, and it is easy to get out of the loop during the winding process. However, the traveler is too heavy, and it is easy to increase the yarn breakage, which increases the number of stoppers.
The labor intensity, therefore, should be comprehensively considered in the selection of the spun yarn travellers. It is better to master it slightly, so that it can not only prevent the unwinding of the bobbin, but also reduce the spun yarn.
Hairiness and yarn breakage will not increase.
2.5 The influence of the height of the spun sheep's feet on the looping. The spun sheep's feet are too low, the small yarn time is longer, and the yarn breakage is increased.
The inability of the winder I sequence to produce results in waste. This is one of them. If the sheep's feet are too low and the center of gravity of the bobbin is lower, it will easily cause looping.
It is not possible to pursue the output one-sidedly to increase the speed, but at the same time, it should also consider that the bobbins are too easy to loop when the speed is too high, which not only reduces efficiency, affects production, but also affects quality. In fact, the taper of the paper tube has a certain influence on the output.
With a 5 ° 57 paper tube, a fixed length of 94000m is sufficient. The smaller the taper, the higher the output of the winding process, so the flat head tube for air spinning has the highest output.
Effect of winding tension on tripping In order to wind into a package with a certain density and good shape, the yarn must have a certain tension when winding, and the size should meet the process requirements. If the tension is too large, the physical and mechanical properties of the yarn, such as elasticity, elongation, and strength, will be lost, which will affect the yarn quality and the rate of end breaks in the subsequent processes. If the tension is too small, the package density and winding capacity will be reduced, and the forming will be poor. After the end break, the yarn is easy to be embedded in the yarn loop, and it is not easy to find the end. During the unwinding in the later process, the yarn loop may fall off, causing looping or broken ends, resulting in a large number of loops.
The effect of the height of the balloon breaker on the tripping The role of the balloon breaker is to reduce the centrifugal force and tension of the bobbin on the spindle in order to obtain a higher winding speed. The closer the breaker is to the bobbin, the greater the frictional force, the better the control of the bobbin, the more feathers, and the less looping; on the other hand, the farther away from the bobbin, the smaller the friction, the worse the control of the bobbin, and the hairiness decreases. Increased tripping. From the perspective of controlling yarn tension, the low installation position is suitable for high count yarns, and the high installation position is suitable for low count yarns. Because the installation position is high, the yarn tension is too easy to break. It is not necessarily true. The position of the position must also consider the contradictory unity of the hairiness and the bobbin loop caused by friction.
Summary
In summary, it can be seen that everything follows the dialectical rules, and it is not good to pass or fail. For the problem of looping, the choice of process in spinning and winding
It is necessary to comprehensively consider a variety of factors, find the best critical point through experiments and comparisons, and adjust the equipment accordingly to better understand.
Decision. At the beginning of our company's use of the automatic winder, the unwinding of the bobbin was very serious. After analysis and taking the above measures, it was completely eliminated.
