Abstract:Compact spinning, as a new kind of spinning technology, has gained wide attention because of its great reduction in spinning triangle and yarn hairiness. In order to meet the demand of high-grade clothing, research on further improving the performance of compact spun yarn is the emphasis. Of all the existing compact spinning systems, the four-roller compact spinning with lattice apron is most widely used at present because of its low cost. Therefore, this paper aims to put forward a new kind of device to impro… Show more
“…Compact spinning is the redesigning of the conventional ring spinning where the spinning triangle was eliminated. This results in the optimum translation of fiber properties into the yarn with significant enhancements in different yarn qualities like lower hairiness and imperfection, higher evenness and strength, better resistance to abrasion, and a lower tendency of pilling [ 20 , [24] , [25] , [26] , [27] ]. Fig.…”
“…Compact spinning is the redesigning of the conventional ring spinning where the spinning triangle was eliminated. This results in the optimum translation of fiber properties into the yarn with significant enhancements in different yarn qualities like lower hairiness and imperfection, higher evenness and strength, better resistance to abrasion, and a lower tendency of pilling [ 20 , [24] , [25] , [26] , [27] ]. Fig.…”
“…In their study, air guides with a downward-sloping slot on one side and two small holes at the top were the best. Yang et al 17 developed a new design called an air damper for lattice-apron compact spinning in addition to the air guide. The air damper was set as a rectangle and located on both sides of the fiber-converging zone.…”
The four-roller compact spinning system is widely used today and is considered an improvement over traditional ring spinning because of its excellent yarn properties. Reducing energy consumption in compact spinning has always been a key issue for the textile industry. This paper proposed a method for installing an air guide on compact spinning to reduce energy consumption. Four types of air guides were designed with different side shapes (Type-N, Type-L, Type-R, and Type-LR), and the airflow characteristics in the converging zone were analyzed using numerical simulation. In addition, high-speed photography technology and image-processing technology were used to study the dynamic state of the fiber bundle in the flow field of the converging zone. The effectiveness of the preferred solution of the air guide was also verified by spinning experiments. The results revealed that the best air guide was Type-LR, achieving a 3.7% reduction in yarn hairiness even after a decrease in negative pressure by 800 Pa and a 58.4% reduction in power of the fan motor, surpassing the yarn quality observed without any air guide.
“…However, this method has narrow variety adaptability and is not beneficial for continuous production. 28 In light of the literature and previous studies, Quan et al 29,30 proposed a multivariate principle curve drafting device based on a ring spinning frame. Researches previously conducted by the authors focused on the theoretical and experimental analysis of novel and traditional drafting systems, demonstrating the improved yarn qualities due to different working principles.…”
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confidence: 99%
“…However, this method has narrow variety adaptability and is not beneficial for continuous production. 28…”
The multi-principle drafting device is investigated to improve the comprehensive properties of ring spun yarns. In this study, the front gathering area on the multi-principle drafting device was mathematically modeled to analyze the effects of inlet width, outlet width and path length of the grooved collector on friction forces. The numerical analysis results demonstrate that the outlet width and path length play important roles in frictional forces, while the variation of the inlet widths has little effect on the friction forces. The experiment results also reveal that for 18.4 tex yarns, different outlet widths of the grooved collector have considerable influence on yarn tenacity and hairiness, whereas they show an insignificant effect on yarn evenness and imperfections. Moreover, the effects of process parameters (different roller gauges and break draft ratios) on the novel drafting device with an optimized grooved collector to spin 18.4 tex yarns were investigated by response surface methodology. The results indicate that although the break draft ratio and front roller gauge create significant effects on yarn unevenness, the back roller gauge has no apparent influence on it. In addition, response surface methodology predicted the minimum yarn unevenness of 10.71% under optimal conditions of 1.2 break draft ratio, 32.5 mm back roller gauge and 17.5 mm front roller gauge, which is very close to the experimental result of 10.57%, reaching an advanced level compared to Uster Statistics 2018 of 5%.
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