Air-jet vortex spinning yarn has the advantages of high tightness, less hairiness, and good wear resistance, but its strength is slightly lower than that of ring spinning yarn and its feel is slightly harder. In the early days of entering the market, air-jet vortex spinning had low market acceptance due to hand feel. As more spinning companies continue to develop, innovate and expand markets, the product range and application areas of air-jet vortex spinning yarns continue to expand.
1. Development of high-count pure cotton yarn
The semi-free-end spinning method of air-jet vortex spinning has high requirements on fiber raw materials, especially the length and uniformity of the fibers. According to the characteristics of spun carded cotton yarn and the yarn count limit study, it can be seen that as the count of pure cotton yarn increases, uneven evenness will be much more serious, and more yarn defects are likely to occur, and combing is the main one; The spinnable yarn count range of carded cotton yarn is very narrow, only 14.8 ~ 16.4 tex.
In order to improve the quality of air-jet vortex spinning pure cotton yarn, efforts need to be made from the selection of raw materials, optimization of spinning processes, and temperature and humidity control of the production environment. The best cotton fiber is long-staple cotton or fine-staple cotton, and a combing process is required to improve the uniformity and parallel straightness of the fiber length in the cotton sliver. Jiangsu Yueda Textile Group Co., Ltd. aims at the problems existing in air-jet vortex spinning of pure cotton and high-count yarn. Through equipment improvements, it achieves light-weight sliver forming and stable transportation. It adopts untwisted sliver micro-tension conduction feeding technology to reduce sliver loss. Unexpected drafting, improving the nozzle cylinder positioning connection device to enhance the stability of the air flow in the twisting chamber, and focusing on optimization of relevant processes during the production process, finally achieved the development and industrialization of 7.3 to 9.7 tex ultra-high count pure cotton air-jet vortex yarn.
2. Development of core yarn
Core-spun yarn has an internal and external composite structure. In order to give full play to the unique advantages of air-jet vortex spinning in the production of core-spun yarn, the industry has invested more energy and technology development. A team of experts has developed an air-jet vortex spinning device suitable for the production of metal wire core-spun yarn. Unlike other fiber filaments, which have excellent flexibility, metal wire elasticity is low and the structure is easily damaged, so a special feeding device is required. An annular groove is provided on the entire surface of the top roller to prevent extrusion, and a metal wire channel is provided in the fiber guide, so that the metal wire is located at the core of the yarn and is tightly wound and covered by the spiral short fibers to form a yarn.
3. Development of differentiated structural color spinning
According to the structural classification of air-jet vortex spinning color spinning, it can be divided into uniform structural color spinning and differentiated structural color spinning. Uniformly structured color spinning is represented by hemp gray yarn and snowflake yarn. The colored fibers are evenly dispersed in the yarn and have the uniform morphological and structural characteristics of traditional yarns. Differentiated structural color spinning requires controlling random or regular changes in yarn color and structure during the spinning process to form a unique appearance of fancy yarn, dotted yarn, and segmented yarn.
There is a patent that provides a processing method of air-jet vortex spinning fancy yarn. Filaments of different types and colors are unwound from the filament frame and transported to different drafting areas on the air-jet vortex spinning machine through the filament controller for drafting. It is stretched and broken to form colored silk segments, which are merged with the bundled short fiber slivers and then enter the twisting chamber for twisting. Finally, the colored silk segments are used as decorative yarns and are spirally wrapped around the main body of the yarn. yarn. On this basis, the air-jet vortex spinning machine is modified, and the filament is fed into the drafting zone with spun yarn, and the yarn is drawn and broken at the middle roller. The spun yarn segment participates in spinning to form an air-jet vortex spinning yarn with a dot appearance. By changing the density and twist of fine yarns, the controllable adjustment of discrete points on the air-jet vortex spinning yarn can also be achieved.
