1. Oily yarn
Causes: oily hand joints, yarn falling to the ground, dirty containers, too much oil on top rollers and rollers.
2. Flying flowers are attached
Cause: flying flowers are caught in the strips, and the upper and lower fleece boards The cleaning device is not functioning properly, the passage is not smooth and stained, and the cleaning method is improper.
Three, coarse warp and wrong weft
Cause: broken tops, double feeding , floating head, poor joint wrapping, channel hanging flowers attached, pressure failure, rollers and top rollers tangling flowers, etc.
Four. Uneven thickness
Cause: The cooked strips are seriously uneven and the roving The twist is too large or too small, the roller is bent, the gauge moves, the winding roller and the top roller are eccentric, lack of oil, poor operation, pressure failure, the bell mouth is skewed, the stroke is off, the jaw is too tight, and the set The machine is damaged and jumps, the spindle wing shakes its head severely, etc.
Five, wrong number of yarn
Cause: the wrong number of cooked strips is fed or There is a big difference in the weight of the cooked strips, and the drafting gear is wrongly adjusted.
6. Yarn popping up and running out
Cause: spindle or bobbin gear jumps, Improper configuration of the forming gear results in excessive tension and squeezing of the wound roving, stagnation of the upper rail reversal, uneven height of the upper rail, uneven height of the spindle, spindle wing or pressure palm, serious wear of the bobbin gear, etc.
Seven, off-shoulder yarn
Cause: Turn off the car when the upper beam is changing direction, Improper configuration of the forming gear, uneven roving tension control, poor meshing of the forming reversing gear, ineffective reversing device, bobbin gear jumping, etc.
Eight, loose yarn, rotten yarn
Cause: the feed sliver is too thin, the joint When pulling out too much bad yarn or the end-breaking time is long, the twist coefficient is too small, the roving tension is too small or the number of threading and winding is insufficient, the curvature of the pressing palm is incorrect, the starting position of the cannon belt is not correct, etc.
9. Tight hard yarn
Cause: excessive twist, excessive tension, channel The resistance is too great, the number of turns of the pressing palm is too much, the forming teeth and lifting teeth are improperly configured, the starting position of the iron cannon belt is not correct, etc.
Preventive methods: Improve technical level, strengthen defect prevention and mechanical customs clearance, conduct regular rounds, and strictly implement the “Five Certainties” of cleaning work.
Effects on post-processing processes: yarn defects increase, spun yarn breaks increase, affecting the standard product rate of cotton yarn and the physical quality of the cloth. </p
