What is air-jet spinning?

The main principle of air-jet spinning is to use jet airflow to twist the fiber strip after drafting. Some free fibers at the head end of the fiber strip are wrapped around the periphery of the fiber strip for spinning. There are two types: single nozzle and double nozzle. The latter has good and stable spinning quality. The fiber strip is thinned by the drafting device, output from the front roller, passes through the first nozzle, the second nozzle, the yarn guide hook, and the yarn guide roller, and is wound into a bobbin by the groove drum. The vortex rotation directions of the two nozzles are opposite, and the second nozzle The vortex intensity is greater than that of the first nozzle, so that the twist on the yarn strip between the two nozzles can overcome the torque and resistance exerted by the first nozzle on the yarn strip, and is transmitted to the nip of the front roller. The twisted fibers on the periphery of the fiber strip The free end is affected by the first nozzle and is wrapped around the fiber strip in the opposite direction. The fibers in the twisted yarn core are retreated through the nozzle, while the wrapped fibers become tighter and tighter during the reverse retreat process. Provide yarn strength and cohesion. Compared with ring spinning, air-jet spinning has the advantages of high output, large packages, and short processes. The speed range of air-jet spinning is from 100-200 meters/minute, and the suitable spinning yarn count range is: 5.5-3.0 tex. The output is 10 times that of ring spinning and 2 times that of open-end spinning. It is suitable for spinning various short fiber and filament core-spun yarns and processing plied medium-length chemical fiber yarns. Japan’s Murata is an expert in air-jet spinning, and its products include MJS, MVS, and RJS. The shape of air-jet spinning is similar to open-end spinning, with a hard feel and good hairiness.

Jet spinning uses high speed produced by compressed air The jet vortex spins the continuous sliver output from the drafting device into yarn after wrapping and twisting it. It is a non-free-end false-twist wrapped spinning yarn with a unique yarn structure. The core fiber in the center of the yarn is basically untwisted after being subjected to false twisting. The free edge fibers at the head ends around the yarn form random wrapped fibers with a certain inclination around the core fibers under the action of twisting, untwisting and wrapping. There are both Z-twist and S-twist fibers. Compared with the ring-spun yarn of the same variety and the same number of properties, the strength of the air-jet yarn is 10%-20% lower, the diameter is slightly larger, and the coloring ability is stronger. The outer fiber has obvious directionality, and the wear resistance of single yarns along the yarn output direction is higher than that in the opposite direction.

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