Air jet loom
The air-jet loom is a new type of loom that uses the high-speed airflow generated by the release of compressed air to pull the weft yarn through the fabric mouth to complete the weft insertion. It is currently the fastest-growing type of shuttleless loom. It has developed to the current level. After a long time. As early as 1910, some people tried to use air flow for weft insertion. In 1914, Americans created the air-jet loom. In 1929, the air-jet loom was patented in the United States. The air flow speed used for weft insertion is required to be quite high in order to produce the necessary traction force on the weft yarn. But when high-speed airflow flies in the air, the relatively still air in front of the airflow has a certain resistance to it. At the same time, the flying airflow will drive the surrounding relatively still air to relax together, which will also consume a certain amount of energy. Therefore, the high-speed airflow flying in the air The velocity of the flow decreases significantly over a short distance. Therefore, the P45 commercial air-jet loom produced in Czechoslovakia in 1950 had an effective reed width of only 45cm due to the free flying of the weft insertion airflow in the air. In order to overcome the rapid attenuation of the air flow, people use pipe sheets to form an air flow channel to reduce the influence of the surrounding air on the weft insertion air flow and slow down the attenuation of the flow speed, thereby making the air flow weft insertion more reliable, extending the weft insertion distance, and making the reed width of the loom be expanded. Thus the duct sheet airjet weaving machine was created. The pipe sheet air-jet loom has an insurmountable shortcoming, that is, the pipe sheet is thicker and occupies a larger space for warp yarns. It is difficult to weave high warp density fabrics and has a narrow range of weaving varieties. The air-jet weft insertion system composed of main and auxiliary nozzles and special-shaped reeds created by the Dutch has been used in air-jet looms produced by Swiss Ruti Company. Because it can weave high-density fabrics, the consumption of the main air jet flow is constantly supplemented by the auxiliary nozzle, and the speed of the weft insertion air flow is basically constant, which expands the effective reed width of the air jet loom. This weft insertion system is currently the most advanced weft insertion system for air-jet looms and has been widely used. Due to the continuous expansion of the adaptability of air-jet loom fabric varieties, the continuous improvement of reed width, rotation speed, weft insertion rate, operating efficiency, automation and intelligence, air-jet looms have made rapid progress. In particular, the reed width, rotation speed and weft insertion rate of air-jet looms are much higher than those of other machines. In terms of performance and fabric variety adaptability, they can cover most of the weaving range of multi-phase, projectile, rapier and water-jet looms. , is a machine model that will be widely used in the weaving industry in the future.
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