Question: When the spinning yarn is being wound without stopping or shaking in the middle, delooped yarn will occur. What is the reason?
Cause analysis
(1) Traditional The bobbin forming process is to configure the yarn winding pitch according to 4 times the yarn diameter. In order to ensure a certain bobbin winding diameter, a certain step pitch needs to be configured according to the size of the yarn count. When the yarn count is thicker, we usually need to configure a larger upgrade; when the yarn count is finer, we usually need to configure a smaller upgrade. For a certain bobbin winding diameter, one process is to configure a smaller winding pitch and a relatively larger step pitch, and the other process is to configure a larger winding pitch and a relatively smaller step pitch. However, in the first process, the cohesion force in the yarn layer in the first step is greater than that in the second process. When the cohesion force in the layer is greater than the friction between the yarn layers, the unwinding phenomenon will occur. .
(2) There are many reasons for delooping, and the delooping situation is different with different yarn raw materials. Such as pure cotton, pure fiber, polyester-cotton blends. If the equipment is in normal condition, you can increase the winding circle distance of the yarn, that is, adjust the lifting teeth, but the effect is not obvious. The lifting ratio of the forming cam should be adjusted to increase the short lifting stroke of the ring cotton, generally about 60 mm, so as to effectively solve the problem of not decoupling during high-speed unwinding. But the bobbin yarn capacity will be reduced.
(3) The essence of bobbin decoupling is the slippage of the winding layer during the unwinding process. Cop decoupling is a relatively complex problem. The specific situation will be analyzed in detail: In terms of variety: there are more compact yarns than combed yarns and carded yarns; winding speed: there are more winding machines with higher speeds than low speeds. If a certain variety is generally decoupling, it means that the winding density is too high; if a certain machine is decoupling, it means there is a problem with the equipment status (the total chain links are sluggish, the winding tension is low, the spindle foot has multiple bobbins, etc.); if If the small yarn is out of loop, it means that the bottom forming is too large, and the forming convex nails need to be moved back or removed.
Solutions
(1) First check whether the peach plate is worn and whether the ring plate is lifted or lowered Beating, bobbin management jumping, forming density is too high, the wire ring is too light, the bottom of the tube is too round, etc. are the reasons for the self-winding delooping. In addition, if the yarn is delooped when the yarn is small, the self-winding bobbin can be Decreasing the speed a little more when retreating to the bottom of the tube for forming can also reduce the decoupling phenomenon.
(2) If the peach plate is in good condition, you can try to make the bottom tube forming smaller.
(3) From a process perspective, the high and low teeth and supporting teeth can be adjusted. Increase the yarn pitch and reduce the step-up.
(4) Also pay attention to whether the traveler is too light and the bobbin is too soft. If so, you can consider adding weight to the wire ring, making it smaller in winding shape, and speeding up the vehicle.
(5) It may also be caused by high yarn twist and insufficient winding density. The yarn twist can be appropriately reduced.
The above are some methods and suggestions summarized by the editor to prevent spun yarn from delooping. You can try to adjust and solve according to this idea. Netizens are also welcome to leave messages to discuss and propose more solutions. Method. </p
