How To Reduce The Weaving Defects Of Air-jet Loom

The common defects of the fabric produced by Air-jet loom are mainly weft contraction, hundred feet, double weft and sparse dense road, these common defects are the main factors affecting the weaving efficiency of air-jet loom. Netizens have analyzed the causes of these defects, and put forward corresponding solutions, hoping to enlighten us.


Compressed air is not pure, very easy to cause gas road plugging, so that the gas pressure is not stable, weft flight uneven and form weft contraction. Trachea, joints, regulating valves and other air parts leakage caused by air pressure instability, will also affect the normal flight of weft. --Hey, Kung fu.
Stop yarn needle release time is improper, nozzle solenoid valve Opening and closing time is not allowed, nozzle pressure is too high or too low, will cause the weft before the flight crowded, weft can not be straight over the shuttle mouth and cause weft contraction; the right side of the hinge closed time late, the weft is not caught in time, the weft is retracted, the weft-insertion time is too early, the opening height is not enough, so the weft shrinkage is increased. Conversely, the weft is too late, the filling angle is too late, the opening height is relatively small, the weft head end and the warp collide, resulting in weft In addition, the injection time with improper combination will also form weft contraction.
The temperature and humidity of the workshop is low, the elasticity between the fibers is relatively enhanced, the friction force decreases, and the twisting-back torsion increases to form the weft contraction.



Workshop temperature and humidity instability, so that the performance of warp and weft yarn, the impact of the clarity of the shuttle, to adjust in time, general air jet loom temperature 22 degree ~26 degree , relative humidity between 72%~78%.


Weft the rebound spring of the gauze needle is ineffective, which causes the angle of the stop yarn to open and fall is inaccurate and unstable, the weft is easy to get out of the gauze needle, the yarn is not centered on the yarn-storage drum, the weft is slid out from the storage drum, and the distance from the weft to the pressurized nozzle is too close, and the weft is swung violently from the weft. It is easy to throw out from the retaining yarn, the pressure nozzle fails to aim at the center of the weft collector, the irregular yarn circle, and the incorrect position angle of the main nozzle will result in double weft defects.

Replace the weft-retaining thread spring; Replace the retaining yarn needle, adjust the distance of the weft collector to the pressurized nozzle, or add the air coil breaker, adjust the height and angle of the weft to the appropriate position, replace the repaired left scissors, press the positive turn button to check, the yarn can not have the weft nap phenomenon.




The general weft twist coefficient is relatively small, the yarn strength is lower, twist increases 5%~9%, can have






Reduce shutdown frequency. Shutdown is the main cause of the dense road, improve the quality of semi-finished products to reduce the shutdown is the most effective way to reduce the defects of dense road. The block should be treated in time to prevent the formation of the defects of the sparse dense road, or the automatic processing device of weft ends can shorten the weft stopping time and eliminate the sparse dense road.