Under normal conditions, there are fewer broken ends before yarn forming. In production, the broken ends are mainly after yarn forming. The breakage rules after yarn forming are as follows:
(1) The distribution of broken ends in yarn dropping is generally the most in small yarn, the second in large yarn and the least in medium yarn. The most broken ends are at the beginning of empty tube spinning and at the end of tube forming, where the winding of large diameter yarn and small diameter yarn are about to be completed.
(2) After yarn forming, more broken ends occur in the spinning section (called upper broken ends) and less in the traveller-to-barrel broken ends (called lower broken ends). However, improper matching of rings and travellers will cause vibration, wedging, wear, burnout, flying rings and other situations of travelers, and increase the number of lower broken ends. Hair breakage occurs rarely in the balloon part. Only when the ring is receding and the traveler is off-diameter, can the balloon convex impact the gauze separator too much, and make the yarn hairy or springy.
(3) Under normal production conditions, most of the blossoms do not break in drop yarn, but only in individual spindles, which is caused by sudden change of spinning tension caused by poor mechanical condition.
(4) With the increase of spindle speed or package, spinning tension will increase and end breakage will generally increase.
In addition to the above rules, changes in climate and temperature and humidity will also cause large-scale workshop breakage. In addition, when the cotton blending adjustment, fiber properties (length, linear density, grade, etc.) change greatly, if the process parameters are not adjusted in time, will also increase broken ends.