The so-called warping break is the breakage of the yarn produced by the warper during normal winding. The indicator for the examination of warping breaks is “the number of broken ends of 100 million metersâ€, that is, the number of broken ends of a warp yarn within a length of one million meters. Because of the different fabric structure, the winding is interrupted during the unwinding process on the warping machine. When the head is particularly long, it not only affects the efficiency of the warping machine, but also increases the workload of the operator. It also increases the fabric defects and has a bad influence on the fabric. As a spinning mill, the yarn may lose orders and even lose customers. Thus, it can be seen that the problem of warping breaks is particularly important for the spinning mills that sell yarns and the weaving mills that buy yarns.
The number of broken ends should be converted into the number of breaks in the yarn of a unit of one million meters. In the early stage of the automatic winding, the main findings were: "sticking" broken ends, "turning out" broken ends, "chaotic layers" or "returning" broken ends, irregular breaks, individual yarn breaks.
Understand the basic situation of the yarn (such as: batch, variety, count, number of broken ends, broken parts, broken head caused by a bad type of yarn, etc.), we take measures to solve the problem and finally improve The quality of the yarn reduces the warping of the warp. The following is described as follows:
The "adhesion" breakage phenomenon is a broken head caused by entanglement when the yarn is unwound, and is generally broken when the diameter of the yarn is relatively large. The cause is that the tension of the bobbin is large and the bobbin is wound too tightly. The SAVIO-ORION-M/E winder controls the tension of the yarn with two devices, the tension disk and the balancing pressure. The greater the tension, the greater the density, and vice versa. According to the author's experience, the density of the package is generally controlled at about 0.444kg/dm3. For the large yarn of the yarn, there are many broken ends. Part of the reason is that the diameter of the package increases with the diameter of the package, and the weight of the package is gradually increased. When the tension is constant, the heavier the package, the tighter the tension, so it can be understood as Large yarns are tighter than small yarns. To solve this problem, the tension can be opened, and the tension is tight when the yarn is small, and the tension is loose when the yarn is large, so that the tension of the yarn is kept as uniform as possible, and the problem of sticking breakage can be improved.
Another reason for adhesion is the high hairiness. It is well known that the hair yarn will increase a lot during the winding process, so the growth of the hairiness in the winding process should be minimized. Our factory has done a lot of experiments in reducing hairiness. It is the easiest, most convenient and effective method to reduce the winding speed, but it affects the output. The second is to ensure that the channel is smooth and reduce the friction point. The pre-clearing device can be removed, the balloon rupture device can be set to the open state, and the porcelain nozzles on the friction point can be checked for damage. There are also process aspects that use a small tension process design to reduce hairiness. Of course, the root cause of Mao Yu Gao needs to be solved in the previous process, such as: unreasonable process, raw material problems, etc.
The "uncoiling" phenomenon is a broken piece caused by a plurality of yarns or a plurality of yarns being taken up by a yarn which is unwound at a high speed. The cause is that the tension of the bobbin is small and the bobbin winding is too loose. Contrary to the reason for the "adhesion" breakage, reference can be made to the tension control method when the breakage is broken.
The "return" phenomenon is the attachment of the yarn during the winding of the yarn. Normally normal winding does not produce these two phenomena. The reason for this is that I think it is an external factor that disrupts the normal winding process. Through long-term observation on the workshop site, the cause is closely related to the repeated suction of the large nozzle and the negative pressure of the main suction motor. Secondly, the large suction nozzle absorbs the mess caused by the cheese yarn. The solutions are:
Adjust the distance between the large nozzle and the bobbin one by one, and keep the gap of 3~5mm; check whether there is a single ingot unsatisfactory or the yarn detector sensor is faulty and cause repeated joints; check whether there is a shifter who does not process the bobbin directly. Single spindle start button phenomenon, strengthen the trainer training; whether the yarn clearing process is too strict to cause frequent joints; the "cycle" menu can be used to adjust the number of yarn ends from 3 times to 2 times, or even once, to Reduce the number of repeated suctions; reduce the speed of the suction motor of the front, reduce the negative pressure of the suction of the large nozzle, etc. In short, strengthen the equipment management, personnel training and on-site management. First of all, to ensure that the design strength of the yarn can meet the whole Wanted.
Secondly, it is possible to appear in the following three aspects. First, the knot strength is low, because the knot is one of the weakest places on the yarn body. It is necessary to check whether the knot configuration is reasonable and whether the knotting process achieves the best effect. The second is the broken head caused by weak crepe. This phenomenon is more common in low-yield varieties. The so-called weak sputum is actually a rough knot. This thick knot is not added with sputum during the twisting process of the spun yarn, and the strength is also very low. Need to optimize the yarn clearing process. The third is the detail break. For reasons such as the breakage caused by the grinding of the side of the yarn during transportation, the unwinding of the individual winding spindles, the unreasonable design of the yarn clearing process, and the leaking of the particularly bad yarn. In the past, there was a case where a large single nozzle of a single ingot sucked the cheese and broke the yarn. Many factories now require the number of the car, the spindle number and the date of manufacture in the paper tube of the bobbin, because the problematic single ingot can be discovered, analyzed and solved in time.
The yarn clearer does not cut off the yarns of small group yarns, spun yarns and strips. These yarns have very low strength, which will cause warping of the warp and the optimization of the yarn clearing process. With the popularization of automatic winders, the proportion of automatic winding yarns will become larger and larger. How to reduce the warping breaks caused by the failure of automatic winding yarns is especially important: discover problems and deepen Follow the scene on the workshop to find out the cause and solution of the problem, and the various types of work must be operated, cleaned and overhauled in strict accordance with the operation method to ensure that each spindle of the equipment is in the best working condition. In order to use the advantages of the automatic winder to spin a good product to meet the needs of the subsequent process.
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