In daily production, package yarns mainly have quality problems such as loose yarns, overlapping yarns, frayed yarns, poor forming, unqualified splices, winding yarns, flying yarn defects, etc. In response to these problems, corresponding measures should be taken to improve the quality of the package yarn.
1. Pine bark yarn
The appearance of pine bark yarn on the package is part of the yarn The thread is not spun onto the bobbin according to the normal winding method, but is much narrower than the width of the bobbin. Instead of being tightly wound on the bobbin surface, it is relatively loose and cannot be unwound normally during high-speed unwinding.
The reason for this phenomenon is that the yarn tension is too small, and the reasons for the yarn tension being too small are as follows
First, there may be granular impurities or larger flying flowers between the two tension bowls, causing the tension bowl to not rotate, the tension bowl to not work, and the yarn tension is too small, causing the yarn detector rod to lift up for spinning. , causing loose bark yarn;
Second, the yarn detector rod fails, and the smaller tension cannot hold the yarn detector rod, causing the yarn detector rod to lift up for spinning, Resulting in pine bark yarn;
The third is spinning outside the tension. The yarn does not pass through the normal channel and the tension is small, which causes the yarn detector rod to lift up and spin, resulting in loose yarn.
Take corresponding measures for the above causes of pine bark yarn: if there are impurities or flying flowers between the tension bowls, clean up the impurities or flying flowers in time and strengthen the Supervise the quality of employees and improve their sense of responsibility and quality awareness.
Security workers frequently inspect the yarn detector rods, and repair the automatic stop box if the yarn detector rods are malfunctioning in a timely manner, creating a good production environment for employees.
Reduce the number of times of spinning under tension. If loose yarn appears on the bobbin, deal with it promptly. Remove that part of the yarn to prevent the loose yarn from continuing to be wound onto the bobbin. above, causing adverse effects on the enterprise.
2. Overlapping yarns
Overlapping yarns are caused by the groove drum beating too much and unable to rotate. Smooth or caused by the failure of the intermittent device of the drum machine. Improper angle of the spindle can sometimes easily produce overlapping yarns. If this happens, the spindle must be repaired in time and will be replaced.The overlapping packages are reversed.
3. Worn yarn
There are two situations of worn yarn, one is One is that the surface of the bobbin is worn, and the other is that there is a circle of wear on the big end of the bobbin.
The package with worn package surface is caused by the damage of the auto-stop box, which causes the spindle to be unable to automatically lift away from the high-speed running trough after the yarn is broken, or the failure of the yarn detection rod, which causes the spindle to often spin by itself during spinning. Lift it up, and the turner on duty puts a heavy object on the yarn detection rod. As a result, the spindle cannot automatically lift after the yarn is broken, and it cannot be discovered in time. The yarn rotates with the groove drum for a long time and wears the surface of the package.
In this case, the security worker should repair the damaged self-stop box in time. If the duty lathe finds that the yarn detection rod of the self-stop box is malfunctioning, he should ask the security worker for repair. Don’t take matters into your own hands.
The phenomenon of a circle of wear on the big end of the bobbin is caused by the loose core of the spindle, or the improper relative position between the groove barrel and the spindle. When you find this phenomenon, do not blindly use the grinding spindle, and let it be repaired before use.
IV. Poorly formed yarn
The poorly formed package yarn is due to the grooved barrel guide There are yarn marks in the groove or improper operation causes the yarn to wander.
For this kind of spindle, it is necessary to find a security guard to grind the groove barrel. When cleaning, the groove barrel should be stopped before doing it to avoid touching the groove barrel. If it is bad, it will affect the bobbin forming. For subs with pine cores, repair them promptly after discovery.
5. Unqualified joints
For unqualified joints, there are knots and wires , low knot strength, large knot hairiness and other phenomena.
For the control of knot quality, the turners on duty should develop the habit of checking knots, and bad joints cannot enter the inside of the bobbin.
Security personnel should check the splicing quality of the splicer every day to ensure the splicer’s joint qualification rate. It is easy for yarn to attach during the knotting process.
In this case, do not let the yarn on your hands float away during the operation.The outgoing yarn waste head is too long to avoid bringing in cotton yarn, causing yarn waste to attach and affect the intrinsic quality of the package yarn.
6. Winding
The winding inside the bobbin is caused by improper operation by the turner on duty. of. When driving again after parking, press the handle of the automatic parking box if the yarn cannot be pulled tightly. In addition, due to the twist of the yarn, it is easy for the yarn to curl.
Regarding this phenomenon, it is necessary to strengthen the training of on-duty lathes, improve their quality awareness and operating level, make them proficient in operating methods, and reduce the occurrence of coiling.
7. Flying yarn defects
Flying yarn defects in the package yarn are caused by the winding During the process, the fly is formed by entering the package yarn behind the electronic yarn clearer. It may also be caused by the missed cutting of the electronic yarn clearer, causing yarn defects in the spun yarn to enter the package yarn.
The quality of this kind of package yarn must be achieved by strengthening cleaning management, strengthening the cleaning around the spindle, and ensuring the blowing effect of the dust blower. Maintaining the yarn clearing effect of the electronic yarn clearer and reducing the number of missed cuts can effectively reduce flying yarn defects in the package.
Improving the inherent quality of package yarn is a long-term issue that requires the joint efforts of all employees to improve operational levels, enhance their sense of responsibility, and allow employees to establish quality first. 1. Customer-oriented quality awareness, all work is focused on product quality, and all work is done to improve product quality.
Managers at all levels should often tell employees about the significance of product quality to the enterprise.
Strengthen the operational guidance, supervision and inspection of employees, guide them to master the operation methods, reduce the inherent quality of the package yarn, and improve the overall quality level.
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