Common yarn defects refer to kilometers of details, kilometers of thick spots, and kilometers of neps tested by a evenness evenness meter. The number of frequent yarn defects reflects the evenness of the yarn to a certain extent. Such yarn defects can be controlled and reduced through technology and management methods, but they cannot be completely eliminated. The main influences of spinning and winding processes on common yarn defects are:
The influence of spinning yarn twisting system on common yarn defects
Spinning yarn A poor twisting system will increase yarn defects. For example, the yarn guide hook is grooved, the steel ring is aged, the traveler is hung, the traveler yarn channel is worn, the traveler is too light or too heavy, etc., which will cause the yarn channel to be blocked, the yarn to hit the yarn plate or the tube end, etc. , causing the yarn to run unstable, the yarn to be shaved, and the long hairiness, short velvet, etc. attached to the yarn body may be scraped into neps, small thick spots, etc., thereby increasing yarn defects.
The impact of the winding process on frequent yarn defects
Winding is the last process in the spinning process and has an important impact on the final delivery to The user’s yarn quality plays a vital role. It can be seen from the USTER Bulletin that for medium and fine special yarns of the same variety and level, the number of common yarn defects in package yarn is greater than that in bobbin yarn, indicating that the winding process has a certain negative impact on the quality of bobbin yarn. Therefore, it is necessary to pay attention to the management of the winding process, minimize the negative impact of the winding process on bobbin quality, and reduce frequent yarn defects.
For example: the position of the yarn insertion seat is incorrect, the tension disk (piece) is too heavy, the central axis of the tension disk is grooved, the yarn guide rod or yarn detection rod has white lines at the beginning of the groove, and there are marks on the surface of the groove cylinder Burrs or too thin oil, too fast winding speed, too high winding tension, etc. will increase the number of common yarn defects in the yarn. </p
