Preventive measures for package yarn defects
In order to improve the quality of the package yarn, we adopt the method of inverting the package yarn to spot check the package yarn quality in our daily work. During the inspection, it was found that the package yarn spun on the GA014 winding machine had yarn defects such as loose bobbins, surface damage, overlapping yarns, poor forming, unqualified joints, “little braided” yarns, and attached fly flakes. In response to the above various quality problems, we have taken corresponding measures to prevent them.
(1) Pine tube defects. This defect is manifested in that part of the spinning yarn is not tightly wound on the surface of the bobbin, but is relatively loose, resulting in the inability to unwind normally during high-speed unwinding, which is caused by the spinning yarn tension being too small. Cause: There are granular impurities or larger flying flowers between the two force bowls, causing the tension bowl to not rotate and the spinning yarn tension to be too small; the yarn detection rod fails, and the smaller tension cannot hold the yarn detection rod, causing the yarn detection The rod lifts up the yarn; the yarn does not pass through the normal channel and is spun outside the tension. In view of the above reasons, the tension bowl can be cleaned in time, and the yarn detection rod can be inspected frequently. At the same time, the tension outside spinning can be avoided to enhance the quality awareness of employees. When the bobbin has “loose yarn” defects, the loose yarn should be removed to prevent it from continuing to be wound on the bobbin.
(2) Surface damage of the package yarn. The surface damage of the package yarn can be divided into two situations, one is that the surface of the package is worn, and the other is that there is a circle of wear on the big end of the package. The former is due to the damage to the automatic stop box or the lathe on duty placing heavy objects on the failed yarn detection rod, causing the spindle to fail to lift automatically after the spinning yarn ends. In this case, the security worker must promptly repair the damaged self-stop box and yarn detection rod, and does not allow the on-duty lathe to handle it on his own. The latter is caused by the loose core of the spindle or the improper relative position between the groove barrel and the spindle. When this phenomenon is discovered, the maintenance worker should repair the spindle before starting production.
(3) Overlapping tubes. Overlapping bobbins are caused by excessive beating of the grooved bobbin, unstable rotation, or failure of the intermittent device of the winding machine. When the angle of the spindle is improper, it is easy to produce overlapping bobbins. When such spindles occur, they must be repaired and reversed in time.
(4) Poor forming defects. Poorly formed packages are caused by yarn marks in the yarn guide groove of the grooved package or improper operation by the lathe. For this kind of spindle, the maintenance worker should grind the trough barrel, and the turner on duty should stop the trough barrel before cleaning, so as not to damage the trough barrel and affect the shape of the bobbin.
(5) Unqualified joints. Unqualified joints are mainly characterized by knots with strings, low knot strength, and large knot hairiness. Regarding the control of knot quality, the on-duty workers must develop the habit of checking knots and pay attention to avoid the phenomenon of wire residue caused by too long wire return heads. At the same time, the security workers are required to check the splicing quality of the splicer every day to ensure the twisting performance. The connector splicing qualification rate.
(6) “Little braid” yarn. This yarn defect is mainly caused by improper operation. When the winding machine is stopped and then started again, the spinning yarn should be tightened and then the automatic stop box handle should be pressed to prevent “little braid” yarn defects in the spinning yarn due to twist.
(7) Flying yarn defects. This yarn defect is caused by flying flowers entering the package behind the electronic yarn clearer or the electronic yarn clearer missing detection. During production, the cleaning around the spindle should be strengthened to ensure the blowing effect of the dust blower; the electronic yarn clearer should be overhauled to reduce the number of missed cuts, so as to effectively reduce flying yarn defects in the package.
The improvement of the inherent quality of the package yarn requires the joint efforts of all employees. By improving the operation level and enhancing the sense of responsibility, the inherent quality of the package yarn can be reduced to achieve the purpose of improving the overall quality level of the package yarn.
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