How to reduce air-jet looms?

The common defects of fabrics produced by air jet loom are mainly weft, hundred feet, double weft, and dense road. These common weaving are the main factors affecting the weaving efficiency of air jet loom. Netizens analyzed the causes of these defects and proposed corresponding solutions, hoping to inspire everyone.

Depression cause

The yarn release needle release time is not correct, the nozzle solenoid valve opening and closing time is not accurate, the nozzle pressure is too high or too low, which will cause the weft yarn to squeeze before and after the flight, the weft yarn can not fly straight through the shed and cause weft; the right side is twisted The closing time is late, the weft yarn is not clamped in time, the weft yarn is retracted; the weft insertion time is too early, the opening height is not enough, and the weft shrinkage is increased; on the contrary, the weft insertion is too late, the weft yarn arrival angle is late, the opening height is relatively small, and the weft yarn end is When the warp yarns collide, the weft yarn is 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, which promotes the increase of the back-twisting torque to form the weft.

solution

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 lifting, which is easy to pull down in the moving state. Generally, the height of the heald frame is checked once a week, which can not only eliminate the influence of the elongation of the wire rope, but also eliminate the running repair machine. Due to frequent on-board, bad car repair, and improper adjustment, the workers and the mechanics are caused by the unevenness of the heald frame or the incorrect height.

The temperature and humidity in the workshop are unstable, which makes the warp and weft yarns 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%.

Double latitude

The rebound spring of the weft feeder yarn yarn fails, which causes the yarn drop needle to open and fall in an inaccurate and unstable angle. The weft yarn is easy to escape from the yarn retaining needle; the yarn retaining needle wear does not hit the storage drum, and the weft yarn is stored from the yarn storage drum. The drum slides out; the distance between the weft feeder and the supercharging nozzle is too close, the yarn loop is drastically shaken when the weft yarn is retracted from the weft feeder, and it is easy to pry out from the yarn retaining needle; the supercharging nozzle fails to align with the weft storage. The center of the machine, the irregular yarn loops, and the incorrect angle of the position to the main nozzle will cause double weft points.

solution

Replace the weft feeder yarn retaining spring; replace the yarn retaining needle; adjust the distance of the weft feeder to the booster nozzle or install the balloon rupture device; adjust the height and angle of the weft feeder to the appropriate position; replace the repair left scissors, press Check the forward button to prevent the weft yarn from being pulled when the yarn is cut.

Hundred feet cause

Generally, the twist coefficient of the weft yarn is relatively small, the strength of the yarn is low, and the twist is increased by 5% to 9%, which can effectively reduce the break of the weft yarn. The use of the rotor spinning can effectively reduce the details of the yarn; and strengthen the maintenance of the weft insertion device. In time, the flying flower generated by the weft detector is cleaned; the normal pressure of the main nozzle is lowered, and the nozzle pressure is controlled under the condition that the weft yarn can pass smoothly; the technical training is strengthened, the work responsibility of the vehicle operator is improved, and the operation method is strictly enforced.

Dense road cause

Weaving mouth displacement. When the loom is stopped, both the fabric surface and the warp yarn are subjected to a large upper machine tension, and at this time, the weaving opening is separated from the steel reed, and the weaving opening is deviated from its corresponding position during normal weaving due to creep and slack of the warp yarn. The amount of deviation varies with the length of the stoppage time. When the vehicle is re-driving, if the position of the weaving mouth is not handled properly, a dense road is formed on the cloth surface. In addition, there are many idle speeds of the idle train, and the tension of the sling ring and the winding tension of the take-up mechanism are insufficient, and the weaving mouth is also displaced.

The device status is bad. As the loom continues to operate for a long period of time, some mechanical parts and components gradually wear out or even fail, and the motion accuracy is degraded, or the first wefting power of the first weft is insufficient after driving, and the first weft is not fully driven into the weaving mouth; Or the brakes are not timely when the yarn is broken, and there are vacancies in the weft yarn and the failure of the take-up and take-up.

solution

Reduce the frequency of parking. Stopping the car is the most important reason for the thin road. Improving the quality of the semi-finished products to reduce the stoppage is the most effective measure to reduce the density of the road. In the production, the blocker should handle the stop in time to prevent the formation of the dense road breakpoint; or arrange the weft break automatic processing device to shorten the weft stop time and eliminate the dense road.