Key factors of forming operational yarn defects in semi-finished products
Due to the high speed of the winder, the spinning tube yarn is easy to break off in the unwinding process.
In spinning production, due to untimely cleaning, failure of cotton collecting device, sharp increase of broken ends, abnormal temperature and humidity of air conditioner or poor a
Measures: optimize the drawing area process and keep the good rubber roller rubber ring state; Control the number deviation and evenness of single and roving, and isolate the abnor
It is mainly expressed as long segment, low frequency, such as double yarn in single yarn, three yarn and four yarn in strand, as well as long coarse section and long details.
When the roving is stretched by the sudden change of external force, the weak ring on the roving is often drawn down, and the twist on the normal yarn is transferred to the detail
Too small drawing force results in poor cohesion between fibers, resulting in unstable fiber speed change point, wider sliver width, poor control of edge fibers, poor yarn evenness
When the micronaire value of raw cotton is normal, the raw cotton with long quality and good length uniformity has good yarn evenness, high strength, low single yarn strength uneve
With the wide application of modal, Tencel and other new cellulose fibers in clothing fabrics, customers have high requirements on the quality index of yarn produced by such fibers
The occasional yarn defects are mainly divided into four types: cotton knot (n), short coarse section (s), long coarse section (L) and detail (T), and branch deviation (C, CC), etc
Frequent yarn defects and occasional yarn defects such as A1, A2, B1, B2 are collectively referred to as small yarn defects.
Strictly speaking, because this kind of breakage exists before doffing, it can not be included in the calculation range of doffing head retention rate.
