Mechanical analysis and numerical simulation of a multivariate principle curve draft device and analysis of its yarn properties

et al. 2022

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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%.

“…By investigating the distributions of friction fields in the drafting zone, the multi-principle drafting system enables longer and stronger friction fields. 29,30…”

Section: A Multi-principle Drafting Systemmentioning

confidence: 99%

mentioning

confidence: 99%

Numerical analysis and experimental investigation of a multi-principle drafting system in ring spinning

et al. 2022

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“…The friction field is improved by the curved drafting channel, thereby regulating the movement of the fiber bundles. 23,24…”

Section: The Novel Drafting Devicementioning

confidence: 99%

“…Based on the afore-mentioned research, a novel drafting system based on a ring spinning frame has been proposed by Quan and colleagues 4,23,24 In the preliminary study, theoretical and experimental investigations of the new device were carried out. In the theoretical aspect, the friction fields in the drafting zone were simulated and the differences in the acceleration points caused by different friction distributions were analysed.…”

mentioning

confidence: 99%

Investigation into novel drafting systems on ring spinning frame for improving yarn properties

et al. 2022

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During the spinning process, the drafting process plays an important role because it is closely linked with yarn properties. In this study, two different bottom pins (N–A and N–B) based on a novel drafting device were designed. The simulation results of drafting forces between N–A and N–B demonstrate that N–B shows higher drafting force than N–A at the same draft ratio. Specifically, the drafting forces of both devices show an increasing trend as the front draft ratio increased. In experiments, 14.7 tex and 18.5 tex yarns were spun by N–A and N–B, respectively. The experimental results reveal that N–B produces yarns with better properties, including yarn evenness, imperfections and tenacity, compared to N–A. Notably, the evenness and imperfections of yarns spun by N–B achieve advanced levels and the characteristics of yarn tenacity are close to advanced levels. The experimental results verify that different drafting forces between N–A and N–B devices have an important impact on the yarn evenness, imperfections and tenacity, but not on the hairiness.

“…Inspired by the research work above, Quan et al. 25 introduced a multivariate principle curve draft device and analyzed the differences in yarn properties between novel and traditional yarns, which demonstrates that the novel device can significantly improve yarn properties. It is well known that the control of fiber movement in the drafting zone has a direct and profound effect on the quality of the yarn.…”

mentioning

confidence: 99%

Numerical simulation of dynamic pressures on a novel drafting system and experimental study on yarn properties based on friction fields

et al. 2021

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The friction fields of a novel drafting device based on the ring spinning frame are investigated in terms of numerical simulation and experimental studies. In numerical simulation, the results demonstrate that the dynamic pressure distribution in the drafting zone is presented in the form of wave undulation in the main drafting zone. Besides this, the pressure peak greatly increases close to the front nip. The effect of different spacers and middle roller speeds on the pressure distribution was also simulated, which indicates that the dynamic pressure decreases strictly with increasing spacer size, while at middle roller speeds of 0.18 rad/s and 0.26 rad/s the pressure distributions only show a significant difference at the pins nip and not throughout the drafting zone. For experimental studies, the friction fields of the novel drafting device were tested with different spacers. The peaks of the friction field decrease with the increasing spacing in the main drafting zone. The friction force shows a wavy undulation in the direction of the middle roller nip to the front roller nip, and there is also a great increase in the peak of the friction force near the front roller nip. Analysis of the properties of the three yarns spun by the novel draft device under different spacers shows that changing the spacer affects the friction forces of the drafting zone and has a significant effect on the yarn evenness, imperfections, and strength, but not on the hairiness.