Air-jet loom weaving common gray fabric main defects are weft, hundred feet, double weft, and dense roads. By analyzing the causes of weaving, improving the weaving efficiency of air-jet looms is not a problem.
Causes:
(1) The quality of the original yarn: the yarn twist is too large, the free end retreat is serious, causing the weft to fly unstable and causing weft; the yarn hairiness is long, the knot is large, the head end of the weft yarn is in a floating state, once the weft yarn hairiness When rubbed with warp yarn, it is easy to form a winding, causing weft.
(2) Quality of semi-finished products: The quality of the weaving shaft is poor, and the openings are not clear due to sticking, twisting, and skeining, and weft yarns are hindered from moving, especially when the loose ends cause weft-like weft shrinkage.
(3) Mechanical state: The compressed air is not pure, and it is easy to cause blockage of the air path, so that the pressure of the air supply is unstable, and the weft flight is not straight and forms a weft. Air leakage caused by gas components such as gas pipes, joints, and regulating valves caused the air pressure to be unstable, affecting the normal flight of the weft.
(4) Unclear openings: Even very mild yarn slacking and fiber-to-fiber adhesion can make the weft flight obstructed and form weft.
(5) The weft insertion process is not reasonable: the yarn release needle is not properly released, the opening and closing time of the nozzle solenoid valve is not accurate, and the nozzle pressure is too high or too low, causing the weft thread to rush after the flight, and the weft yarn cannot fly straight through the shed. Causes the weft shrinkage; the right side is closed late, and the weft is not gripped in time, and the weft is retracted. Weft shrinkage due to unreasonable weft insertion time: the weft insertion is too early, the opening height is not enough, and the phenomenon of weft shrinkage due to the poor weft flight due to warp hairiness and other defects tends to occur; otherwise, the weft insertion is too late and the weft reaches The corner is late and the opening height is relatively small. The head end of the weft yarn collides with the warp yarn, causing the weft yarn to be hindered from forming the weft. In addition, the injection time is improperly matched. When the weft yarn reaches a certain point, the auxiliary nozzle electromagnetic valve at the place does not open in time, causing the weft to fly in a relaxed state and forming a weft.
(6) Temperature and humidity in the workshop : The temperature and humidity of the workshop is low, the elasticity between the fibers is relatively enhanced, friction is reduced, and the torsional force of the anti-deviation is increased.
solution:
(1) In general, the weft yarn strength should meet the requirements of weaving, select a smaller twist factor as possible, polyester-cotton fabrics should also improve the effect of fixed-ring; design the best twist, reduce unevenness; use knot-free yarn; Properly postpone the opening when the tightness is not high.
(2) The warp tension of the warping should be 2~3 g, strictly control the sizing side row, correct the distance of the opening of the plate, and ensure that the opening of the plate matches the width of the blank.
(3) The imperfect compressed air can be equipped with a double-layer filter at the air inlet. The filter is regularly cleaned and maintained; the presence of moisture in the cloth should check whether the drying system is operating normally; in daily maintenance, ultrasonic vibration should be carefully used. Clean the solenoid valve.
(4) 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.
(5) Ensure that the yarn guide channel is clear. Check the steel file for serious scars and bends.
(6) The process design must be reasonable, and the injection time of the last set of auxiliary nozzles should be appropriately extended. The opening time of the right twisted edge device should be appropriately advanced and the head end of the weft yarn should be held in time.
(7) The temperature and humidity of the workshop is unstable, so that the performance of the warp and weft yarns will change, affecting the clarity of the shed, and must be adjusted in time. The general air-jet loom temperature is 22 to 26 °C and the relative humidity is between 72 to 78%.
Causes:
The original yarn had insufficient strength and uneven yarn thickness; the blown weft yarn did not pass through H2, that is, H2 did not receive the weft yarn pulse signal, and the root weft yarn passed H1, so the loom operated as usual, resulting in a hundred foot defect; The weft is dirty, the sensitivity is reduced, and 100 foot defects are generated; the main nozzle is under normal pressure, the weft yarn is blown in the main nozzle, and when the first weft is driven, the weft is formed on the right side of the cloth, and the pressure of the main and auxiliary nozzles is large. The detail of the weft yarn was blown; the operator couldn't perform the operation as required when handling the stop. If the broken weft should be extracted, it would cause a hundred feet defect.
solution:
The weft coefficient of general weft yarn is relatively small, the strength of the yarn is low, and 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 inspection of the weft insertion device is strengthened. , Clean up the fly from H1 and H2 weft detectors; reduce the pressure at the main nozzle; control the nozzle pressure under the condition that the weft can pass smoothly; strengthen the technical training, improve the work responsibilities of the operators, and strictly implement the operation method.
Causes:
When alternate weft insertion, the first weft yarns on the other weft feeders are introduced into the weaving surface and weave into the cloth surface. On the left side of the cloth surface, a 30 cm double weft defect point is formed. The analysis shows that there are mainly several causes of the storage weft. Detachment of the weft yarn: The spring of the yarn picker yarn catch spring fails, causing the yarn stopper to open and fall. The angle is inaccurate and unstable. The weft yarn is easy to escape from the yarn stopper; yarn needle wear is not centered and the yarn storage drum is touched. On the top, the weft yarn slides out from the storage drum; the distance from the weft feeder to the booster nozzle is too close, and when the weft thread is withdrawn from the weft feeder, the yarn ring flutters violently and is easily thrown from the yarn stopper; the booster nozzle Failure to align the center of the weft feeder, the yarn loop is irregular, and the position angle to the main nozzle is not correct. As a result, the tension of the weft yarn is not stable when the scissors cut the yarn, and the weft yarn springback pops up from the yarn feeder; The blade is loose, the yarn cutting time is not stable, and the knife edge is not sharp. The weft yarn is broken and the weft yarn rebounds.
solution:
Replace the weft feeder to block the yarn spring, wipe lightly with lubricant; replace the yarn stopper; adjust the distance from the weft feeder to the boost nozzle or add a balloon breaker; adjust the height and angle of the weft feeder to an appropriate position; Replace the repair left scissors, check the cut yarn when the forward rotation button can not check the weft phenomenon.
Causes:
(1) 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.
(2) Bad equipment condition. 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:
(1) Reduce the frequency of parking. Loose roads do not appear when loom stops within 3 minutes, dilute roads occur within 5 minutes, and obvious roads disappear after 10 minutes. Therefore, parking cars are the most important cause of thin roads. Improving the quality of semi-finished products in order to reduce stoppages is the most effective measure to reduce the number of sparse roads. Stoppers in production should be stopped in time to prevent the formation of sparse roadsides, or automatic weft-breakage processing devices can be used to shorten weft stoppages. Time to eliminate the dense road.
(2) Equipment maintenance. After the spindle with worn shaft head gets on the car, the weaving shaft in the production run will jump as a whole, which will seriously damage the weaving shaft bearing, and can easily cause the dense road weaving. The rough rubber surface of the take-up friction roller is used for a long time and the wear is large. The surface roughness of the rubber skin gradually decreases and the friction coefficient with the cloth surface decreases. During the rotation, slippage between the cloth surface and the roller sometimes occurs, forming a cloth surface. The phenomenon of normal weaving at the two ends of the machine and the appearance of a dense road in the middle will affect the quality of production. Therefore, the failed rubber skin must be replaced in time.
(3) Optimization of process parameters. Symmetrical sheds have low warp tension when the shed is fully open, reducing the density of the zipper, but the style of the fabric is poor. The farther back and forth position of the rear beam is, the longer the warp yarn behind the shed, especially the longer the upper warp yarn, the lower the tension peak value at the time of opening, the smaller the tension change, and less likely to produce a dense road, but the rear beam will increase after the weft stops. The position of the warp stop should be slightly lower than the warp position at the time of the flattening, and it can be appropriately reduced when the weft is lazily raised. The front and rear positions of the warp stop determine the length of the warp behind the shed. The stop of the warp stop also helps to reduce the warp tension peak at the opening and reduce the thinness of the warp. During the opening process, the opening has a small stroke and it is not easy to produce a dense road. The opening time is set according to the density of different fabric structures and warp yarns. The earlier the opening, the tighter the warp yarns are during weft insertion, which is beneficial to the beating of general heavy fabrics. In addition, if there is a secret road, the reversal amount of the weaving shaft before driving is reduced; if a lean road occurs, the reversal amount of the weaving shaft before driving is increased. After setting the parameters according to the above method, the loom can enter the normal weaving operation program. The tension on the machine is not enough. After the end of the beating, the weaving mouth moves backwards, causing a scary road.
Xiao Bian above from Lu Yu Textile ~~ For more information, please pay attention to China
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