Shape of yarn defects
Hairiness is one of the important yarn defects that affects quality assessment. It usually occurs in the drafting and twisting triangle area. In actual production, the hairiness caused by hanging wire rings not only affects the quality of the yarn, but is also difficult to detect during inspection.
Specific form: The hairiness is concentrated and fine, with a fluffy appearance. The winding layer and the binding layer in the yarn tube are not clearly distinguishable. The hairiness index of 1 mm to 9 mm is detected to increase to varying degrees. The comparison between the normal hairiness index and the hairiness index of the wire ring is shown in The following table.
Comparison of normal hairiness index and hairiness index of wire ring hanging
Analysis of yarn defect formation mechanism
The speed of the traveler is directly proportional to the speed of the front roller. When the traveler is stained or the cleaner accumulates debris, the friction between the steel ring and the traveler increases, and the shape of the airflow formed by the movement changes, causing a pulling movement between fibers. Formation of hairiness. At the same time, the temperature of the traveler and steel ring increases, and the pattern-bound traveler is not easy to dissipate heat. The viscosity of the air is high, which affects the polymerization of the fibers. The speed of the traveler is unstable after being patterned again, and the tension from the spinning section to the winding section is affected. , which increases the diffusion of edge fibers and easily causes hairiness.
Causes of yarn defects
1) The steel wire ring is astringent and hairy and of poor quality.
2) The surface of the steel ring is rough, which increases the wear of the wire ring and forms hairiness.
3) The distance between the wire ring and the cleaner is too large or ineffective, causing the cleaner to function poorly and causing hairiness.
4) The relative humidity in the workshop is too low and there are too many flying flowers. It is easy to attach to the traveler with the movement of the traveler, causing the traveler to hang.
Prevention of yarn defects
1) Different yarn varieties use different traveler cleaner spacing. Practice has proved that the distance between the traveler and the cleaner is 1.45 mm for yarns below 14.6 tex, 1.6 mm for 18.2 tex ~ 2 tex, and 1.7 mm for 27.85 tex, which can effectively prevent hairy yarn defects caused by travelers hanging. At the same time, it requires Traveler cleaners must work well. Wire rings without a cleaner will become scratched again after 2 hours of cleaning.
2) Strengthen operation and operation management, and clean up the hanging flakes every time the yarn is doffed.
3) Control flying flowers and relative humidity in the workshop.
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