【Technology】Effect of Rings and Travellers on Yarn Hairiness

There are mainly the following aspects in the influence of ring and wire ring on yarn hairiness.

Rings and traveler yarn channels do not form hairiness

The traveler can cause local wear on the traveler when running on the ring, as shown in Figure 1. When the yarn runs on the traveler, a yarn channel will be formed. If the traveler of the traveler approaches or crosses the wear zone of the ring and the traveler, the yarn will slide into the wear when running, and the yarn will frictionally generate hairiness. , Even cut the sliver to form a broken end, especially in the small shape of the wire loop, more easily produced when the channel is narrow.

Steel ring recession produces hairiness

The essence of the ring neck recession is that the steel ring is used for a long time or improperly used, resulting in serious wear and tear of the surface of the steel ring, and the friction factor between the ring and the ring ring is reduced and unstable, resulting in a sharp decrease in the spinning tension, resulting in expansion of the balloon The hairiness is caused by impact collision with the separator board.

The hairiness formed by the steel ring recession sometimes has an obvious regularity in the distribution of the length of the yarn. Similar irregularities are uneven and easy to confuse. The hairiness curve shown in Figure 2 was measured by the Silly Model SDL-98 Yarn Feather Gauge, which was caused by the inspection system's ring failure. When the spindle is formed at the bottom, the balloon expands and hits the yarn separating board to generate hairiness. Each time the ring plate is lifted and formed, a periodic hairiness is formed. After the bottom forming is completed, the balloon is reduced, and the spacer is no longer hit. Periodic hairiness no longer occurs.

The hairiness meter of USTER3, 4 type dry evenness instrument can test the total length of hairiness per cm yarn under high speed conditions, and give hairiness curve diagram and spectrogram, and divide them into 12 grades according to the length of hairiness, and calculate them separately. Hairiness index. Fig. 3 and Fig. 4 show the changes of the hairiness index and the spectrum. It can be seen that the sample is a strong periodic hairy wave with a wavelength of about 5.75 m. The exponential curve is a typical hairiness curve of a ball-impact isolation yam. . In the figure, A→B is the binding layer, the ring plate is lowered, the balloon becomes larger and the hairiness increases. B→C is the winding layer, the ring plate rises, the balloon becomes smaller and the hairiness decreases.

The traveler is too light and the spinning tension is too small to form hairiness

The weight of the traveler is too light, the spinning tension is too small, the operation is unstable, the air ring is large, the boring head is light, the yarn is jittery, and the air balloon expansion hits the yarn separating board to produce hairiness, but generally the hairiness has no obvious rule. In addition, a lighter traveler will also reduce the torque transmitted by the twisted area of ​​the spun yarn, resulting in widening of the triangular area and increasing hairiness. However, an excessively heavy traveler can increase the spinning tension, resulting in easy wear of the ring, which is detrimental to the reduction of yarn hairiness and yarn breakage.

Helium balloon formation hairiness

If the center position of the ring, spindle and guide hook is not accurate, it will cause ramming spindles, helium rings, and it will also cause hitting the stencil and increase hairiness.