Popular science | How to solve the problem of excessive ends breakage in roving unwinding

With the continuous enlargement of packages and the extensive use of suspended roving frames, the phenomenon of end-breakage of rovings during unwinding of spun yarns is becoming more and more serious. By analyzing the causes of breakage during unwinding of rovings and taking targeted solutions, the number of breakages during unwinding of rovings was significantly reduced. The specific summary is as follows.

1. To deal with the breakage caused by the tension during unwinding of the roving, we only need to set the roving twist coefficient reasonably and adjust the yarn guide rod. Position, keep the hanging spindle flexible, and eliminate the phenomenon of bell mouth accumulation and blockage, you can completely eliminate this type of breakage.

2. For end breaks caused by untwisted thick places and long details, it is only necessary to control such roving defects.

3. On the suspended roving frame, in order to facilitate the yarn spinning after doffing, there is a pile on the upper part of the roving tube specifically to assist yarn spinning. Due to the improper doffing operation of the roving lathe, it is common for the roving to break at the upper pile loop when it is unwound to the last two layers. 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 pressed against the pile loop. 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.

4. The other type of end breakage is completely different from the above three types of end breakage. Its end breakage rules are as follows: In roving There are fewer large yarns when unwinding, but gradually increase after medium and small yarns (especially small yarns); there are more chemical fiber varieties and less pure cotton varieties; some rovings stick and some do not; when the temperature and humidity are low It is more likely to occur; some rovings even form a small sticky ring (sometimes a bundle of fibers) behind the small and medium yarns, causing irregular ends. The main reason is the breakage caused by the adhesion of the roving due to various factors. Solutions to this type of end breakage: Control draw weight unevenness, especially reduce 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 It is smooth and should be polished and cleaned regularly with gasoline strips; the temperature and humidity of the workshop should be adjusted according to the raw materials, especially the relative humidity in winter should be moderately high to prevent the adhesion and breakage of the roving during unwinding caused by the static electricity of the raw materials; the roving twist coefficient should be reasonably designed (should not be too small) and spinning tension; 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 efficiency of the turner. Production efficiency reduces production costs while improving yarn quality.

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