Cotton Textile Technology Siro Spinning Technology and Spinning Practice Hao Fengming Zhang Xian Wang Youjun Yang Jigang (Xi'an Institute of Engineering Science and Technology) (Linqing Luxi Cotton Spinning Mill in Shandong Province) Combining Yarn Spinning Process, Comparative Analysis of Spinning Yarn Quality Yarn quality with ring spinning. It is believed that the hairiness, dryness, and strength of the yarns of the Siro yarn are better than those of the ring yarns, but the details are inferior to the ring yarns.
Traditional ring spinning yarns have many hairinesses, and hairiness not only affects the surface finish of the yarn itself and the strong utilization factor of the fiber, but also affects the smooth progress of the subsequent process. On the other hand, with the advancement of weaving technology, the requirements for the yarn quality of shuttleless looms are getting higher and higher, and the problem of hairiness is even more pronounced. In order to reduce yarn hairiness, measures can be taken in raw material selection, process optimization, equipment selection and operation management. At the same time, spinning technology can also be applied, such as compact spinning technology, winder blowing device. In addition, Siro spinning technology can also reduce yarn hairiness. The spinning principle was invented by the Australian Commonwealth Scientific and Industrial Research Institution (CSRO) from 1975 to 1976. The original purpose was to reduce the hairiness of wool yarns.
In 1978, the International Wool Bureau put this research achievement into practical use. In 1980, it was officially recommended to all countries in the world. Siro spinning is mainly used for the pure spinning or blending of wool, wool polyester, and acrylic fibers. It can also be used on cotton spinning machines. Siro spinning technology is very simple to implement in actual production. Slight changes can be made to the ring spinning machine. The modified spinning machine can not only spin spinning yarn, but also can be easily restored to original Ordinary ring spinning machine.
1 Siro spinning method A roving with a certain spacing is fed in parallel to the drafting area of ​​the spinning frame for drawing and then twisted on the same spindle. Specifically, the following changes are required: (1) Refitting the creel rack, adding double roving hanging-up spindles, and refitting the loading spindles and hanging-up spindles are more convenient; (2) Placing the transverse horns in the original drafting mechanism (3) The yarn traversing device is fixed in the central position or is traversed by small strokes; (4) The automatic stopping device is added to stop the yarn. Its function is to prevent the yarn from spinning, ie, when it is a roving. When the bar breaks, in order to avoid the production of long-segment detail gauze, another gauze must be interrupted in time.
In recent years, the cotton spinning industry has also begun to cite this spinning method.
Generally speaking, the spun yarns of cotton spinning are mostly yarns, and as long as the number of stands for the shifters is reduced, expensive dead-end stop devices may not be used.
2 Siro spinning practice 1 Pure cotton combing product 5ex Siro yarn, using two different spinning processes.
P2 type comber -> FA322 draw frame (7 yarns can be combined with each other can be used for weaving weaving process is to toe, 211 type spinning machine 5ex and ring spinning C14. 5 yarn quality comparison table 1 From Table 1, it can be seen that the CV value, the breaking strength of the single yarn, and the elongation at break of the Siro yarn are better than those of the ring yarn, but the details are high. , Thickness, single strength, elongation, and other indicators are better than scheme II, and the overall performance is the best.By referring to the Uster Bulletin of 2001, the sliver, thick section, and nep of scheme one are equivalent to 5% ~25. The level of % corresponds to the level of 25% to 50%.
Table 1 Quality comparison between combed spun yarn and ring spun combed yarns Item Dry detail Neck Neck single strength Elongation at break Elongation at break CV/% Sero scheme One yarn plan Second ring yarn 22 Blended productsç ° Draft multiple (before X) 39.6 X 1.25 times, twist spinning T/C 65 5 æ»/m spinning machine under the same conditions Roller speed 229 rmn spindle speed and common ring yarn, Siro spinning process For: The number of roving number 330 17278rmn The comparison of yarn quality is shown in Table 2 The quality comparison of 131e spool yarn and ring-spun yarn Item Dry detail Neps Single strength 100m Weight CV/% Hairiness index Siro yarn Ring-spun yarn Fine Compared with the ring-spun yarns, the reel wind yarns of the degree have a single strong single yarn, a small CV of 100m in weight and a reduced hairiness. The quality of the stems is basically the same, the details are numerous, and the number of thick knots and neps is quite large.
23 Composite yarns When two rovings are fed into different materials, the spun yarns are composite yarns, also known as AB yarns. Spinning T/R55/45 185ex composite yarns using Siro spinning technology, the spinning process is: polyester roving quantitative 39g/10m viscose roving quantitative 32g/10m fine yarn twist coefficient 314 roller gauge 19X33mm rear area draft 1.25 times, Jaw gauge 30mm traveler model FLS/ 0 front roller speed 230rmn spindle speed 14400r/mn yarn quality: dry CV 1346%, detail 5/ring thick 46/neps 59/km strong 23 5.72%, elongation at break 1086%, elongation at break CV5.09%. It can be seen that the quality index of siro spinning composite yarn is ideal.
3 Conclusion Winding yarns are of good quality, especially yarns with hairiness, strips and strength are better than ring yarns, which can meet the requirements of woven and knitted yarns. The disadvantage of Siro yarn is that it has more details, mainly due to the fact that the point of convergence of the two slivers output from the front jaw fluctuates up and down during the spinning process, causing a change in the size of the sliver on the sliver at the splicing point to the front jaw. Small details and accidental drafting cause too much detail. At the same time, Siro spinning requires a large draft of spinning yarn and a small amount of roving, which also affects the economic benefits. Further improvement is needed in this regard.
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