With the continuous enlargement of packages and the extensive use of suspension roving frames, the phenomenon of end-breakage of rovings during unwinding of spun yarns is becoming more and more serious. Our company analyzed the causes of end breakage during roving unwinding and took targeted solutions, which ultimately significantly reduced the end breakage occurring during roving unwinding. The specific summary is as follows.
| Set the roving twist coefficient reasonably and adjust the position of the yarn guide rod
In view of the breakage caused by the tension during unwinding of the roving, we only need to set the roving twist coefficient reasonably, adjust the position of the yarn guide rod, maintain the flexibility of the hanging spindle, and eliminate the accumulation and blockage of the bell mouth, so that such breakage can be completely eliminated. .
|Control untwisted thick places and long and thin defects
For end breaks caused by untwisted thick places and long details, just control such roving defects.
| Correct operation to reduce doffing breakages
In hanging spindles On the roving frame, in order to facilitate yarn spinning after doffing, there is a pile loop on the upper part of the roving tube specifically to assist yarn spinning. Due to improper doffing operations by the roving lathe, the roving broke off at the upper pile loop when unwinding to the last two layers. The phenomenon is relatively common. This kind of broken ends can be completely avoided as long as you follow the correct positioning and doffing operation methods. Correct positioning and doffing operation method: maintain the correct dragon rib height positioning. The starting position of spinning must be higher than the pile loop position. When driving after doffing, the dragon rib goes upward, and the wound roving first moves from the upper position of the pile loop to The lower part is rolled up and the pile loop is pressed. Even if adhesive breakage still occurs, since the length of roving left on the roving tube is already very short, it will have little impact on production.
|Reduce breakage caused by roving adhesion
There is another This kind of breakage is completely different from the above three types of breakage. The breakage pattern is as follows: it is less in roving and large yarns when unwinding, and gradually increases after medium and small yarns (especially small yarns); it is more in chemical fiber varieties, There are few varieties of pure cotton; some rovings are sticky and some are not; it is more likely to occur when the temperature and humidity are low; some rovings even form a small sticky ring (sometimes a bunch of fibers) behind the small and medium yarns. , resulting in an unstable decapitation. The main reason is the breakage caused by the adhesion of the roving caused by various factors. Solutions to this type of end breakage: control drawing weight unevenness, especially reducing thin slivers; promptly replace the aging false twister, and regularly clean the false twister with gasoline when spinning chemical fibers; ensure the hollow arm of the spindle flyer Smooth, it should be polished and cleaned regularly with gasoline strips; adjust the temperature and humidity of the workshop according to the raw materials, especially the relative humidity in winter should be moderately high to solve the problem of adhesion and breakage of the roving when unwinding caused by the static electricity of the raw materials; rationally design the roving twist coefficient (should not be too small) and spinning tension; the roving storage time should not be too long; reduce poor roving formation caused by various reasons.
Through the implementation of the above measures, the breakage caused by the roving unwinding has been significantly reduced, which has reduced the labor intensity of the turner and improved the production efficiency. Production costs are reduced while yarn quality is improved. </p
