How to reduce air-jet loom weaving during fabric production?

How to reduce air-jet loom weaving during fabric production? The common defects of fabrics produced by air-jet looms are mainly weft, hundred feet, double wefts, and denser roads. These common weaving defects are the main factors affecting the weaving efficiency of air-jet looms. The netizens analyzed the causes of these defects and put forward corresponding solutions, hoping to inspire them.

The cause of weft shrinkage is that the yarn release time is incorrect, the opening and closing time of the nozzle solenoid valve is not accurate, and the nozzle pressure is too high or too low, which will cause the weft to rush after the flight. The weft yarn cannot fly straight over the shed and cause weft; The time for the closing of the side skein is late, and 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 shrinkage. On the contrary, the weft insertion is too late, the weft arrival angle is late, the opening height is relatively small, and the weft The head end collides with the warp yarns, causing the weft yarns to be hindered to form a weft. In addition, wetting can also occur due to improper injection timing.

The temperature and humidity of the workshop is low, the elasticity between the fibers is relatively strengthened, and the friction force is reduced, which causes the increase of the reversed twisting force to form the weft.

solution

Impurity of compressed air can be installed in the air inlet double filter, the filter regularly cleaning and maintenance; cloth appears moisture should check whether the normal operation of the drying system; in daily maintenance, we must carefully use the ultrasonic vibration instrument to clean the solenoid valve .

In the initial stage of the machine, the heald frame and opening stroke must be adjusted according to the process requirements, and the consistency of the two sides of the heald frame must be taken into account when adjusting the heald frame. On the air-jet loom with open-slots, the steel wire rope is a flexible carrier that is easy to pull down. It is usually checked once a week for the height of the heald frame. This will not only eliminate the effect of the wire rope being stretched, but also eliminate the operation and repair machine. Workers and crews suffer from weft shrinkage due to unevenness in the heald frames or inaccurate height due to frequent machine operations, bad car repairs, and improper adjustments.

The temperature and humidity of the workshop is unstable, so that the performance of warp and weft yarns changes, affecting the clarity of the shed, and must be adjusted in time. The general air-jet loom temperature is 22°C to 26°C and the relative humidity is between 72% and 78%.

Causes of double weft

Weft yarn retractor spring spring failure, resulting in inaccurate and unstable yarn blocking needle opening and falling angle, the weft yarn is easy to escape from the yarn blocking needle; block yarn wear is not centered hitting the storage drum, the weft yarn from the storage yarn Sliding out of the drum; the distance from the weft feeder to the booster nozzle is too close, the yarn ring whips violently when the weft thread is withdrawn from the weft feeder, and it is easily thrown from the yarn stopper; the pressurized nozzle fails to align with the weft storage In the center of the device, irregular yarn loops and inaccurate position angles to the main nozzles can cause double-dotted flaws.

solution

Replace the weft feeder to block the yarn spring; replace the yarn stopper; adjust the distance between the weft feeder and the booster nozzle or install the balloon breaker; adjust the weft feeder height and angle to the appropriate position; replace and repair the left scissors, press Check the forward button to check if there is no weft picking when cutting the yarn. The genesis of 100-foot general weft yarns has a relatively low twist coefficient, and the strength of the yarn is low. The twist degree increases by 5% to 9%, which can effectively reduce the breakage of the weft yarn. The use of rotor spinning can effectively reduce the details of the yarn; The overhaul of the device will promptly clean up the fly produced by the weft detector; reduce the normal pressure of the main nozzle; the nozzle pressure will be undermined when the weft passes smoothly; strengthen technical training, improve the work responsibilities of operators, and strictly enforce the operation method.

Rare road causes

Weaving mouth displacement. When the loom stops, both the cloth surface and the warp yarns are subjected to a large upper machine tension. At this time, the weaving mouth is separated from the steel reed. Due to the creep and slackness of the warp yarn, the weaving mouth deviates from its corresponding position during normal weaving. The magnitude of the deviation varies with the length of the stoppage time. When the car is reopened, if the position of the weaving mouth is not handled properly, a thin road will be formed on the cloth surface. In addition, there are many idling idle cars, the tension of the stab ring and the winding tension of the take-up mechanism are insufficient, and the weaving mouth is also displaced.

Poor device status. With the continuous operation of the loom for a long time, some mechanical parts and components gradually wear out and even fail, resulting in a decrease in the movement accuracy, or insufficient beating force in the first weft after driving, and failing to fully drive the first weft into the weaving mouth; Or the brakes are not timely in the yarn breakage, there is a shortage of weft yarns and warp winding fault caused.

solution

Reduce the frequency of parking. The most important reason for the sparse roads is to park cars. Improving the quality of semi-finished products to reduce downtime is the most effective measure to reduce the number of sparse roads. During the production, the shifters should promptly dispose of the parking platform to prevent the formation of dilute road rollers; or the automatic disposal device for weft yarn breakage can shorten the weft stop time and eliminate the dense road.