Cotton textile technology siro spinning technology and spinning practice Hao Fengming Zhang Xian Wang Youjun Yang Jigang (Xi'an Engineering and Technology College) (Shandong Province Linqing Luxi Cotton Textile Factory) spinning process, comparative analysis of the quality of siro spinning yarn Spinning yarn quality with ring. It is considered that the yarn hairiness, the stem and the strength of the siro yarn are superior to the ring yarn, but the details are inferior to the ring yarn.
The traditional ring spinning yarn has many hairiness, and the hairiness not only affects the surface finish of the yarn itself and the fiber utilization coefficient, but also affects the smooth processing of the post-process. On the other hand, with the advancement of weaving technology, the demand for yarn quality of shuttleless looms is getting higher and higher, and the hairiness problem is more prominent. 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, new spinning technologies such as compact spinning technology and winder blowing devices can also be applied. In addition, the siro spinning technology can also reduce yarn hairiness. The spinning principle was invented by the Commonwealth Scientific and Industrial Research Institute (CSRO) from 1975 to 1976. The original aim was to reduce the hairiness of the yarn.
In 1978, the International Wool Bureau pushed this research result into practical use. In 1980, it was officially recommended to countries around the world. Siro spinning is mainly used for pure spinning or blending of wool, wool polyester and acrylic, and can also be applied on cotton spinning machines. The siro spinning technology is very simple to implement in actual production, and the ring spinning machine can be modified slightly. The modified spinning machine can not only spin the siro yarn, but also can easily restore it to the original as needed. Ordinary ring spinning machine.
1 Siro spinning method The rovings with a certain spacing are fed in parallel to the same drafting zone of the spinning frame for drawing, and then twisted and wound on the same spindle. Specifically, it is necessary to carry out the following transformations: (1) modification of the creel, double the roving hanging spindle, and it is more convenient to modify the spindle and the hanging spindle; (2) the traverse horn in the original drafting mechanism The mouth is changed to the form of two eyes; (3) the yarn traversing device is fixed at the central position or the small movement is traversed; (4) the self-stop device with the broken head is used to prevent the single yarn phenomenon, that is, when a roving is used In order to avoid the generation of long-segment detail rovings, the other yarn must be interrupted in time.
In recent years, the cotton spinning industry has also begun to cite this spinning method.
Generally, the yarns spun by cotton spinning are mostly colored yarns. As long as the number of stands of the vehicle is reduced, the expensive broken head self-stop device can be omitted.
2 Siro spinning practice 1 pure cotton combed product 5ex siro yarn, using two different spinning processes.
P2 type combing machine>FA322 type draw frame (7 pieces of twisted yarn can be used for weaving and weaving process is toe, 211 type spinning machine 5ex and ring spinning C14. 5 yarn quality comparison see Table 1 It can be seen from Table 1 that the coefficient of CV value, single yarn breaking strength and elongation at break of the siro yarn is better than that of the ring yarn, but the details are more. The drying and details of the spinning yarn of the scheme The indicators such as thick section, single strength and elongation are better than scheme 2, and the comprehensive performance is the best. Referring to the Uster bulletin of 2001, the dry, thick section and nep of the yarn of scheme 1 are equivalent to 5% ~ 25 The level of % is equivalent to a level of 25% to 50%.
Table 1 Comparison of the quality of siro-spun combed yarn and ring-spun combed yarn. Dry detail, coarse knot, single knot, elongation at break, elongation at break, CV/%, siro scheme, one yarn scheme, two-ring yarn, 22 blended productsç °Drawing multiple (before X) 39.6 times X1.25 times, twisting under the same conditions, spinning T/C65 5æ»/m spinning machine front roller speed 229rmn spindle speed yarn and ordinary ring yarn, siro spinning process For: roving number 330 17278rmn yarn quality comparison see Table 2 131e siro yarn and ring yarn quality comparison item dry detail thick section cotton knot single strong 100 meters weight CV /% hairiness index siro yarn ring yarn with fine Compared with the ring-spun yarn, the siro yarn has a single high strength, a small CV of 100 meters, a small hairiness, and the quality of the strip is basically the same, the details are many, and the number of thick knots and neps is equivalent.
23 composite yarn When the two rovings are fed into different raw materials, the spun yarn is a composite yarn, also known as AB yarn. Spinning T/R55/45 185ex composite yarn by siro spinning technology, the spinning process is: polyester roving quantitative 39g/10m viscose roving quantitative 32g/10m fine yarn twist coefficient 314 roller spacer 19X33mm rear zone drafting multiple 1.25 times, Jaw gauge 3 0mm wire ring model FLS / 0 front roller speed 230rmn spindle speed 14400r / mn into yarn quality: strip dry CV1346%, detail 5 / Ming thick section 46 / neps 59 / km single strong 23 5.72%, elongation at break is 1086%, elongation at break CV is 5.09%. It can be seen that the quality index of siro-spun composite yarn is ideal.
3 Conclusion The quality of the yarn is better, especially the yarn hairiness, the stem and the strength index are better than the ring yarn, which can meet the yarn requirements for weaving and knitting. The shortcoming of the siro yarn is that the details are too much, mainly because the convergence point of the two yarns outputting from the front jaws fluctuates up and down during the spinning process, causing the change of the twist size on the sliver of the convergence point to the front jaw. The smallness of the twist and the unexpected drafting result in more details. At the same time, the siro spinning process requires large drafting of the spun yarn and small quantitative roving, which affects the economic benefits. This aspect requires further improvement.
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