Polyester yarn

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How to reduce the reeling rate during spinning?

In the process of spinning, there is always a headache problem of winding, which causes yarn breakage and seriously affects warping efficiency. What are the causes of the looping? How can we reduce or avoid looping in? The following from the equipment, technology, operation several aspects to do a discussion.

Cause analysis:

(1) Due to the large suction nozzle, the yarn will be disordered to form a loopback. In warping and unwinding, the tangled yarn is picked up. Because the yarn can not be unwinded, the yarn will be pulled off near the surface of the bobbin to form a broken end, which will affect the warping efficiency.

(2) Due to the simultaneous occurrence of yarn cutting and yarn breakage, the yarn breakage occurs somewhere between the slot drum and the electric cleaning machine. The cut yarn will bounce up and fall onto the flat plate above the electric cleaning machine. When the next splicing operation of the yarn is completed and the slot drum is started, this section of yarn is easy to be drawn into the bobbin and become a loopback.

(3) Due to the poor strength of the yarn and too many weak strength loops, the tension breakage of the yarn occurs under the splicer. After the yarn is broken, it will bounce up irregularly and loosely put on the small end of the paper tube. During the change process of the big suction nozzle, the bobbin reverses and wraps the yarn on the small end of the paper tube firmly. If the large suction nozzle does not break the yarn wrapped on the small end of the paper tube for the first time, then the large suction nozzle will go up for the second, third or even the fourth time to make the change. In the process of making changes many times, the yarn wrapped on the small end of the paper tube will be broken. After the yarn is broken, two ends will be produced, one of which is carried down by the big suction nozzle, and twisted together with the lower yarn head brought up by the small suction nozzle in the splicer, and the grooved drum is started to complete a splicing process. In this splicing process, or in the next splicing process, the return silk left on the small end of the paper tube is easy to be brought into the bobbin to form a loop, and one end of the loop is slightly attached to the bobbin, and the other end is still wrapped around the small end of the paper tube.

Solution 1: optimize winding and electric cleaning process parameters

(1) In order to solve the problem of large suction nozzle sucking disordered yarn, the first thing is to ensure the success rate of the big suction nozzle moving upward to find the upper yarn head. Pay attention to the situation of finding the yarn head with the large suction nozzle, and observe all spindles of all winders of this type. The success rate of the first change of large suction nozzle should be above 99%.

(2) If it can not reach more than 99%, it can be improved from the following aspects: adjust the distance between the large suction nozzle and the tube yarn according to the standard; check the length, roundness and hardness of the paper tube, and discard those unqualified paper tubes; there are three grades of reverse drive of the grooved drum, which are fast, medium and slow. According to these three conditions, we can test them respectively to see which one has the best effect of head finding Good, after the drive is determined, the drive acceleration can also be selected, and the optimal process can be selected according to different accelerations. Secondly, under the condition that the success rate of finding the yarn head is guaranteed, the number of times of changing the large suction nozzle should be set as low as possible.

(3) There are three ways to solve the problem: first, improve the cotton blending to reduce the strength weak ring on the yarn, so as to reduce the breakage at the contact between the drum and the bobbin; second, strengthen the management of the equipment, temperature, humidity and operation in the workshop to eliminate the occurrence of accidental yarn defects, optimize the pre spinning and spinning process, and reduce the cutting times of the electric cleaning machine; third, strengthen the management of the equipment, temperature, humidity and operation in the production workshop, At least every 5 days to do a thorough cleaning of the yarn catcher, to ensure that the mouth is not blocked, can draw back at any time and anywhere.

(4) For the weak loop, first of all, it is necessary to reduce the strength weak ring. In the enterprise's cotton distribution, replace those raw cotton with low single fiber strength and replace it with high strength raw cotton, so that the minimum strength of the single yarn produced can be significantly improved. At the same time, it can reduce the winding speed and the spinning speed, and the tension generated in the spinning process will be significantly reduced, which can also reduce the production of yarn return.

In addition, under the condition that the success rate of finding the yarn head is guaranteed, the process parameters of the automatic winder are optimized. The failure times of finding the yarn head are changed to 1, the action of large suction nozzle is changed to 1, 10 turns are used for "delayed lifting" of bobbin, "10 turns for delayed looking for upper yarn head", and 1 is used for splicing failure. The reason why the above process parameters are used is to realize that the end of the paper tube bobbin floats in the air. Before winding into the bobbin, the single spindle of the automatic winder can give a red light alarm and stop, so that the stop man has the opportunity to pull the return wire wound on the small end of the paper tube by rotating the bobbin, so as to achieve the purpose of eliminating this kind of return wire 。

Solution 2: use four look one change operation method

(1) To achieve "four look and one change". If it is a tube yarn, use the corresponding button on the single spindle to replace the tube yarn under the yarn extraction unit. Second, to see whether there is a small suction nozzle, if it is, the stopper needs to remove the return wire. Third, see if the splicer is hanging back, if so, to clean up the return. Four to see whether there is a loop in the yarn channel, if so, try to clean it out.

(2) The application of "delayed head finding" will affect the production. Spinning enterprises can flexibly decide what kind of process to use according to their own requirements for output and quality, but before the new process is put on the machine, tests must be made to determine whether the process needs to be applied.