Popular Science | The roving ends are getting more and more serious during unwinding. How to break it?

In view of the breakage caused by the tension during unwinding of the roving, you 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 phenomenon of bell mouth accumulation and blockage. This type of breakage can be completely eliminated.

For end breaks caused by untwisted slugs and long details, just control such roving defects.

On the suspension roving frame, in order to facilitate doffing and post-springing, there is a special section on the upper part of the roving tube In the pile loops used for auxiliary starting, due to improper doffing operation by 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 ribs go up and winding The roving is first wound from the upper position of the pile loop to the lower part, pressing 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.

The other type of decapitation is completely different from the above three types of decapitation. The rules are as follows: less roving and large yarns when unwinding, and gradually increase after medium and small yarns (especially small yarns); more chemical fiber varieties, less pure cotton varieties;

Some rovings stick together while others don’t Adhesion; it is more likely to occur when the temperature and humidity are low; some rovings even form an adhering small ring (sometimes a bundle of fibers) behind the medium and small 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 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;

guaranteed The hollow arm of the spindle flyer 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;

Reasonable design of roving twist coefficient (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 roving unwinding is significantly reduced, which reduces the labor intensity of the turner, improves production efficiency, reduces production costs, and improves yarn quality.