Technology Research and Practice of Compact Spinning Production Liu Biying (Jiangsu Yueda Textile Group Co., Ltd.) conducted a number of technological trials and compared the quality of various types of compact and common ring spun yarns. :Compact spinning has more obvious technical and quality advantages than ring spinning. The correct selection of raw materials, the control of the content of short fibers in combed strips, the rational choice of the roving weight and twist coefficient, the number of preferred mesh rings, the position of the sliver feed and Spinning roller gauge, jaw specifications, roving twist coefficient and other process parameters can make compact spinning quality stable and improve.
According to the needs of market development, our company is equipped with the German Sutheon Ete compact spinning device on the DM129 spinning frame, which mainly produces combed compact spinning yarn below 145ex. Through the recent process research and application practices, a certain amount of experience in compact spinning production has been accumulated, product quality has been steadily improved, and various types of products produced have been recognized by the market. Now we analyze some of the technical problems in the production process of compact spinning. Explore.
1 Influence of raw material performance on compact spinning quality Take C11.7ex as an example, the comparison of the spinning quality of the three different cotton blending schemes is shown in Table 1 Table 1 3 cotton blending schemes Spinning quality comparison Conform to the top half of the cotton spinning yarn The average short-staple rate dry kilometers km detail kilometer kilograms kilns hairiness ~ 3mm hairiness strong strong programmatic coefficient Long length / mm / root.
Note: The performance of raw cotton is HV1 test data.
From the test data, it can be seen that the cotton blending program 1 has a higher spinning consistency coefficient, a better micronaire value, a longer length, and a spun yarn), female, senior engineer, Yancheng, 224055:2008-12-12 The CV kilometer details, thick knots, and nep count are less, and the strength is higher, but the yarn is less hairy. From the comparison of the three schemes, the H value and the 3mm hairiness number of the yarn hairiness decreased with the decrease of the cotton linters rate. Therefore, choosing a cotton with a higher consistency coefficient, a better micronaire value, a longer length, and a lower percentage of shorts is beneficial to improve the quality of compact yarns. The actual production can be focused on the selection of cotton indicators according to the user's quality requirements.
2Effect of semi-finished product quality on the quality of compacted spun yarn 21 Effect of short-range content of combed sliver on yarn quality The consistency of short fiber content in the combed sliver, the movement of the fiber during the subsequent drafting process, and the compact spinning device pair The agglomeration effect of the slivers has a certain influence, and Table 2 shows the comparison of the quality of the woven yarns of the cm.ea cultivars when the combed sliver has different fluff content.
From Table 2, it can be seen that with the increase of short fiber content in combed slivers, C1 1.7, the thick and thin CV kilometer of yarns are all increased; although there is no obvious difference in the hairiness H value, but the length The number of hairy feathers in the section, especially the number of hairy feathers, increases with the length of the short-staple rate in the combed strips; there are no significant differences in the average strength, but the lowest strength increases with the rate of short-staples in the combed strips. There is a noticeable drop. In the spinning process, in addition to the work of eliminating short fibers in the combing process, we must also strictly control the amount of short fibers in the cleaning and carding processes, so as to create better conditions for combing and eliminating short fibers, thereby reducing The chance of yarn spots, reducing hairiness and weak ring.
Table 2 Effect of short sliver ratio of combed sliver on yarn quality Combing bar Linters/% kiln detail/kilometer/kilometer/kilogram Neps/hairiness 3mm hairiness strength/N strength minimum strength /N Note: The short fiber rate of combed strips is the AFSS test index (less than 16mm).
22 For the production of C14.6e yarns with different roving rations and twist factors for compact spinning quality, when using different roving rations and affecting the roving twist coefficient, the comparison of the resulting yarn quality is shown in Table 3, Table 3, different roving rations and roving twist coefficient into yarn Quality comparison test program roving weight / g (10m) 1 roving twist coefficient kilometer dry kilometers / kilometer thick / kilograms of neps / hairiness 3mm hairiness strength can be seen from Table 3, when using larger When the roving ration and twist coefficient are the same, the dry CV value of the resulting sliver is lower, but the kilogram-thick kilograms, the kilogram-needles and the hairiness are more; when the lighter roving ration and the larger twist coefficient are used, the yarn is formed. The kilograms of neps and hairiness H are lower, and the number of 3mm hairy feathers is less.
The addition of thicker yarns has certain benefits for the improvement of the dryness level, and at the same time it can reduce the operating cost of the company. However, for compact spinning, the greatest advantage of yarn formation is the low hairiness. Therefore, it is advisable to use a lighter roving weight, larger rovings.æ» coefficient.
3 Influence of spinning process on yarn quality 31 Effect of mesh number on yarn quality Et compact spinning device installs a closed-surface lower apron with a curtain-like surface at the front roller output jaw ) and a rubber roller with a diameter slightly larger than that of the front rubber roller to form the agglomeration area of ​​the fibers.
The rubber roller is driven by the front rubber roller through a gear. Because its diameter is slightly larger than the front rubber roller, there is a slight tension draft between the two, so that the slivers in between are always under tension.
The mesh ring is sleeved on a tubular suction tube (ie, shaped tube). The negative pressure in the shaped tube will be transported by the front roller jaws, which are closely adsorbed on the mesh ring due to the spinning With different numbers, the number of fibers in a single yarn is not the same, and the required airflow adsorption force on the mesh ring is also different. It is necessary to adjust the negative pressure and flow rate to achieve the best condensation effect. When the system negative pressure is certain, the number of grid meshes is different, the flow rate is different, and the condensation effect must be different.
C9.7, C14.6e different number of grid mesh yarn quality comparison in Table 4 can be seen from the comparison data, when the number of grid mesh is more, the dry yarn, kilogram coarse changes little, but Kilometer details, hairiness H values, and 3mm hairy roots all decreased.
Therefore, the use of a larger number of mesh rings is beneficial to reduce the details of yarn formation and improve hairiness.
Table 4 shows the comparison of the number of yarns formed by different grids. M2 dry CV dry cv km details / kilometer thick / kilograms of neps / hairiness H 3mm hairy root. The influence of m 32 sliver feeding into the suction slot position on the quality of the yarn formation The support grid has a narrow suction chute on the special pipe. The length is from the front roller jaws to the added mesh ring. The nip line of the rubber roller is stopped, so that the sliver output from the front roller jaw is in the form of a compressed strip, extending along the oblique path of the surface of the mesh ring, and reaching the nip line of the fiber agglomeration zone, thereby achieving Table 5. The use of different slivers in the feeding position eliminates the purpose of the twisting triangle.
The suction slot has a certain width. The feeding position of the sliver must be different from the suction point at the starting point. The negative pressure airflow has different effects on the gathering of the slivers. The yarn quality of the three slivers when different sliver feeding positions are used. For comparison, see Table 5. Variety sliver feeding position Drying CV dry (V, kilometer details / kilometer thick / kilograms of neps / hairiness H 3mm hairy roots. m slivers in the middle slivers Edge slivers in the middle slivers Edge slivers in the middle slivers in the middle slivers in the rims From the comparison of Table 5, it can be seen that when using different sliver feed positions, there are no obvious differences in some of the conventional quality indicators, but the hairiness indicators are: Larger differences: When using slivers to feed at the edges, the number of hairiness H and 3mm hairiness decreases more, and at the same time, it can be seen that with the increase of yarn number, the comparison of the two feeding positions reduces the extent of hairiness. A sharp drop, which should be related to the width of the feeding sliver. Due to the coarse number, a larger roving ration is used, the width of the feeding sliver is wider, and the width of the suction slot is limited, thus changing the feed. In the position, the negative pressure in the suction slot is different for the set 6 of the strip Output speed roller Comparative polyethylene yarn quality will not be great differences in effect. Roving actual production to combine quantitative, the number and quality cultivar, appropriate adjustment sliver feed position.
33 Effect of different roller output speeds on compact spinning quality When changing the front roller speed, the time required for the slivers to pass through the suction ducts of the profiled pipe is also changing. Theoretically, the negative pressure of the suction slot accumulates the slivers. The role should also be different. When different roller output speeds are used, the comparison of the yarn quality of C9.7, C11.7 and C14.6 is shown in Table 6. The output speed of the item is as follows: Dry CV kilometer detail / kilometer thick / One kilogram of cotton wool hairiness H 3mm hairy root. In the m 7ex yarn, with the decrease of the output speed, all indicators of yarn formation have obvious improvement in terms of level of dryness, number of kilometer defects, or hairiness indicators; when spinning 7ex yarn, when the output speed is 13 quality The indicators are all worse than those of other two speeds. When the speeds are 12 respectively, the indicators of the yarns are close to each other; and when spinning C14.6ex yarns, when the output speed changes, the indicators do not change significantly. This means that when the yarn number is smaller, the yarn quality is more sensitive to changes in the output speed. Spinning C11. 7e below the yarn number should use a lower speed.
Table 7C117ex 〗 Factor 3 Level Orthogonal Test Results 34 Effects of Different Process Combinations on Compact Spinning Quality In order to better select process parameters and achieve a superior technological combination, we performed roving twist factor, spun yarn on C11.7tx varieties. The back roller gauge and the yarn gauge are three factors and three levels of orthogonal test. The test results are shown in Table 7. Test Roller Spacing Gauges Block Specifications Roving Dryer [V Dry (V, km Detail Kilometers) The number of rice wool hairiness H number coefficient / pair of orthogonal test results using range analysis (calculation omitted) with hairiness H as the main considerations, the best combination of technology: roller gauge 18nX35mm jaw gauge 30mm roving When the coefficient 115 uses the dry-cut CV as the main consideration, the optimum combination of technology is: Roller gauge 18mmX33mm Clamp gauge 275mm Roving system twist coefficient 123 Because of very small ranges of the hairiness indicators between the various levels of the roller gauge, the roving modulus coefficient 115 The difference between the level and the time of 123 is also relatively small, so the main combination of the hairiness H and the superior dryness CV is: The roller gauge 18mm Table 8 The quality comparison of the compact and regular ring spinning 33mm The jaw gauge 3 0mm roving twist factor 115 raw Should be based on actual demand, we have focused on the process design, to meet customer quality requirements.
4 Contrastive Analysis of Compact Spinning and Ordinary Ring Spinning Quality Over the past few years, our company has produced a variety of varieties of compact spinning yarns. The comparison of quality of several representative varieties with common ring spinning is shown in Table 8 Spinning bar dry 〔V Dry CV kilometer detail kilometer thick section kilns hairiness 3mm hairiness strong strong CV type / a compact spinning ordinary ring spinning compact spinning ordinary ring spinning compact spinning ordinary ring spinning compact spinning ordinary Ring spinning can be clearly seen from Table 8 that the advantages of compact spinning compared to ordinary ring spinning are mainly reflected in the following points: The decrease in the number of 3mm hairy feathers in four varieties of 146蜉18.2ex is 79. 18.2tx4 Among the varieties, the increase in strength of compact spinning compared to ordinary ring spinning was 8. (3) dry CV values ​​decreased, and the number of frequent pop spots decreased. 7.3 Among the 18.2ex4 cultivars, the stem CV decreased.
80.49, 0.4 and 0.4 percentage points; various types of frequent epidemics have also been reduced to varying degrees.
In addition, the use of compact spinning can properly reduce the twist, thereby increasing the spinning speed and production efficiency, the yarn style is also more flexible; the negative pressure system in the compact spinning can reduce the production plant fly, is conducive to cleaner production; compact spinning strength High and even degree, can reduce the rate of breakage of the post-process and improve the productivity of labor; the hairiness of compact spinning can be greatly reduced, the sizing rate can be reduced, and slurry consumption can be reduced; the singeing process in the printing and dyeing process can be eliminated, and energy can be saved; In dyeing and printing, the consumption of dyes can be reduced, the color difference can be reduced, and the color can be made more uniform. The fabrics woven with compact spinning can be smooth and smooth in appearance, and the quality can be improved.
5 Conclusion Compact spinning can significantly reduce yarn hairiness, improve stemness, and increase strength. Compared with ordinary ring spinning, it has obvious advantages in technology and quality. With the continuous improvement of compact spinning devices and the maturity of the technology, it will play an increasingly larger role in the production of high-grade fine high density fabrics, and it will occupy more market share.
The production of high-quality compact spinning yarn not only requires the configuration of a high-performance compact spinning device, but also relies on a solid equipment foundation, meticulous and standardized operation management, strict quality management and thoughtful scientific process management. It is necessary to conduct in-depth and meticulous process tests and researches on the selection of raw materials, semi-finished products and processes, compact spinning components, and the relevant process parameters of the spun yarns to find out process optimization solutions. At the same time, equipment maintenance and maintenance must be strengthened to reduce the cost of key equipment. By solving the quality problems such as the intarsia of the grid ring, the mechanical wave of the yarn forming, and the quality difference between the spindles, the effectiveness of the compact spinning device can be fully utilized.
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