The common defects of fabrics produced by air jet loom are mainly weft, hundred feet, double weft, and dense road. These common weaves are the main factors affecting the weaving efficiency of air jet weaving machines. These require the attention of air jet loom manufacturers
Cause of weft contraction
The yarn retaining needle release time is improper, the nozzle solenoid valve opening and closing time is not accurate, and the nozzle pressure is too high or too low. These will cause the weft to squeeze before and after the flight. The weft yarn does not fly straight through the shed and causes weft. The right side of the hinge is closed late, the weft yarn is not clamped in time, and the weft yarn is retracted. The weft insertion time is too early, and the opening height is not enough to increase the weft. On the contrary, the weft insertion is too late, the weft arrival angle is late, the opening height is relatively small, and the weft yarn end is in contact with the warp yarn, causing the weft yarn to be blocked to form a weft. In addition, improper matching of the injection time will also form a weft.
The temperature and humidity of the workshop are low, the elasticity between the fibers is relatively enhanced, and the friction is reduced. These promote the increase in the back-twisting force to form the weft.
The compressed air is impure. Double-layer filter can be installed at the air inlet. The filter is cleaned and maintained regularly. If there is moisture on the cloth surface, check whether the drying system is running normally. In daily maintenance, carefully clean the solenoid valve with ultrasonic vibration meter.
In the initial stage of the machine, the heald frame and the opening stroke must be adjusted according to the process requirements, and the consistency of the process on both sides of the heald frame should be paid attention to when adjusting the heald frame. On the air jet loom with the opening of the tread plate, the wire rope is a flexible carrier for the heald, which is easy to pull down in the motion state, and generally checks the height of the heald frame once a week. This can not only eliminate the influence of the elongation of the wire rope, but also eliminate the side latitude caused by the uneven operation of the heald frame or the incorrect height due to frequent machine maintenance, bad car repair and improper adjustment.
The temperature and humidity of the workshop are unstable, which makes the warp and weft yarn performance change, affecting the clarity of the shed. It should be adjusted in time. The general air jet loom temperature is 22 °C ~ 26 °C, and the relative humidity is between 72% and 78%.