How to deal with quality problems in spinning?(6/6)
6 irregularity
The unevenness index includes the weight unevenness index and the sliver evenness index. The general spinning factory pays more attention to the unevenness index, and the monitoring level is also high. There is not much discussion here.
(1) the pressure sensor and frequency control motor are used to control the density of cotton in the new blowing carding double cotton box feeder, so that the vertical and horizontal direction of the cotton layer fed into the carding machine is consistent, and the uneven weight of sliver can be controlled within 2% - 2.5%.
(2) the open-loop, closed-loop and self leveling mechanism of the mixing loop in each process of the front spinning equipment such as carding machine, drawing frame and comber play a positive role in improving the yarn evenness and weight unevenness.
(3) the drafting parts of drawing frame, such as cradle, roller and shaft sleeve, have been greatly improved, which greatly improves the unevenness of short and medium segments.
(4) the end drawing strip is equipped with a coarse section monitoring device, and the roving is equipped with a tension monitoring system, which has a positive effect on improving the yarn evenness.
(5) most spinning factories are equipped with off-line monitoring sliver dryers with high monitoring frequency, which can find out the sliver dryness, thickness and NEP defects in time and solve them in time.
(6) the advanced drawing frame is equipped with an on-line Uster autoleveller and monitoring system, which can monitor the evenness level of the drawing frame on-line and generally cancel the off-line monitoring.
(7) the implementation of a series of on-line and off-line monitoring technologies can guarantee the spinning quality very well, which can generally reach the level of 25% of the communique, and some can reach within 5%.
