The operation method of reducing the defect of combed cotton yarn

In order to improve the efficiency of spinning frame winder, reduce the broken ends improve the yarn quality, the operation method of the stopper was improved. The specific method is to strictly control the production of raw sliver, combed sliver, semi-finished sliver roving according to the fixed length, adjust them in time according to the actual production situation, so as to control the amount of recycled yarn. The roving shall be supplied to the spinning frame at a fixed stage, the elongation difference rate of roving shall be strictly controlled, so as to minimize the difference between roving frames between each drop of the same stage, otherwise, the difference in roving length will be large too many returning ends will be caused. On the basis of fixed length, realize drawing to reduce the feeding of joints taps as much as possible. If there is a broken head, different measures should be taken according to the specific situation. Break before drawing frame, allowed to wrap, to roving frame in processing. It is allowed to connect the sliver at the back of roving frame. Directly put the sliver the back of frame to the front of frame, open the cradle restart the machine. In the spinning process, it is allowed to wrap roving, the joint method after the end breakage is changed to "winding head forming method", that is, the same type of yarn is used to wrap two circles on the tube after the end breakage then connect the head.

In order to prevent yarn defects caused by sliver adhesion friction, the loop speed ratio of the drawing frame shall be adjusted quantitatively according to the drawing sliver to keep the distance between the sliver the sliver barrel at 5mm, the position of the spring of the sliver barrel shall be adjusted so that the difference between the plane high point the low point of the sliver pallet is less than 5mm. When setting the fixed length of the sliver, the height of the sliver shall exceed 10cm of the sliver barrel. In addition, in order to reduce the defects caused by scraping, touching rubbing of the sliver by the sliver stopper in the transportation process, the sliver cylinder is equipped with casters, the stopper is required to contact the sliver directly in the transportation process to prevent the formation of sliver.

In addition, in order to improve the production efficiency yarn quality, it is required to control the sliver of carding combing sliver within 5%, the sliver of drawing sliver within 1%, the coarse yarn head within 1%. The drawing frame with autoleveller is used for production. Considering that the leveller control effect may be weakened in the starting braking stages of drawing frame, it is suggested that the 30 m (for production of plain combed yarn) 15 m (for production of combed yarn) the beginning of ripening shall be used as the return. Considering the influence of roving joint on the quality when changing roving collectively, we suggest to use the first 20 m of roving.

For carding strip, combed strip cooked strip, it can be used directly. The roving head includes joint roving, broken roving roving dropped by spinning change, which can be reused after being processed by roving head machine. However, when spinning combed yarn, the recycle amount of coarse yarn should be controlled within 5% to reduce yarn defects. Through the implementation of the above measures, on the basis of slightly improving the yarn quality, the production efficiency of roving frame is significantly improved. The breakage rate is controlled at one piece when the yarn is 100 spindles, it is almost broken when the yarn is dropped. After the collective change of roving the "winding head forming method" in front of spinning frame, the broken ends of CJ11.7tex yarn per thousand spindles are reduced 37 to 20. The number of broken ends per hundred tubes decreased 26 to 14.