Spinning Process Research Using Siro Spinning Technology to Reduce the Hairiness of Aromatic Sulfone Fibers Gao Jun Wang Fuqiu 2 (1. Shenyang Textile Light Industrial College, Shenyang 110034, China; 2. Huaibei First Textile Co., Ltd., Huaibei, Anhui 235000) The number of yarn hairiness, especially the number of long hairs above 4mm; and found that for the tested polysulfonamide fiber, when the center distance of the bell mouth is 11mm, the yarn forming point is stable and the number of yarn hairiness is small. . The article gives reasonable technical measures. Polysulfonamide fiber belongs to the para-aramid series, known as polyphenylsulfone terephthalamide fiber, which is composed of 4,4 diaminodiphenyl sulfone, 3,3 diaminodiphenyl and terephthaloyl chloride. A fiber made from a polycondensate. It has excellent heat resistance, electrical insulation performance and chemical stability. It can be widely used in aviation field, high temperature working environment protection and other civil fields with flame retardant requirements. It is a high temperature resistant intellectual property with independent intellectual property rights in China. Flame retardant fiber has a good application prospect. However, the fiber yarn is more serious, which affects the quality of the yarn and the feel of the final fabric. In this paper, the spinning test was carried out on the Sirospur machine modified by the traditional ring spinning machine. The siro spinning was studied to reduce the reduction of the hairiness of the sulfonamide yarn. 1Siro spinning technology siro spinning technology is a new spinning method developed by the Australian Wool Industry Research Institute in 1976 and jointly developed with the International Wool Bureau (IWS). It is a kind of spinning, doubling and twisting lines. Completed new spinning method. See the principle of yarn formation. It feeds two rovings A and B on the spinning frame at a certain distance. After drawing, the two single yarns are output by the front roller, and a small amount of single yarn is required due to the transmission of the twist. The twists, the two strips are combined and further twisted into a strand-like skein and wound onto a bobbin to become a siro yarn. This yarn has high strength, low hairiness and a smooth yarn surface. Plate(1) et al. attributed the reduction of hairiness in siro spinning to the capture of hairiness by two single yarns, as shown. It can be seen from the twisting process of the siro spinning that the two strands of the yarn are firstly weakened and then strengthened. This special twisting process causes the strand to pass twice during the yarn forming process. Twisting so that the head or tail of the fiber has two chances to be smashed. In addition, when a single whisker is twisted before the joint point, the twist is small, the twist of the strand is small, and the chance of the fiber ejecting the yarn to become a hairiness is small. Even if the fiber is ejected into a temporary hairiness at this time, after the two strands are combined and twisted in the same direction, the hairiness still has the opportunity to be wound up, thereby ensuring a smooth surface and less hairiness. The actual performance is that the yarn is strong and the number of hairiness is significantly reduced. 2 Spinning test 2.1 The test raw material fiber is a polysulfonamide fiber produced by Shanghai Synthetic Fiber Research Institute. The specification is 2.0dtexx51mm and the length is cut, the number of crimps is 4/cm, the oil content is 0.2%. The fiber moisture regain is 6.2%. The state rupture strength was 3.4 cN/dtex, and the dry rupture elongation was 21% (temperature 20, relative humidity = 65%). The fiber is pretreated with an antistatic agent before being injected into the production. Yarn process route: A002C type cotton picker A006C type blending machine - A036 type porcupine type opener A092 type cotton machine A076A type roll machine A186Z type carding machine FA305C type draw frame A456D type roving machine. 2.2 Test equipment The siro spinning machine modified by the FA503 type spinning frame uses an adjustable double-slot bell mouth as shown. Spinning machine process parameters such as fineness æ» coefficient rear zone drafting / double jaw spacing / mm spindle speed wire ring number cradle pressure (front X after X) / daN double spindle - 丨 roller spacer 2.3 The hairiness test instrument and the test standard test instrument are YG172 type yarn hairiness tester. The test methods and conditions are based on the standard FZ/T01086-2000. 2.4 Test method and content Test It is found that when spinning at the center of a certain bell mouth, the two yarns of the front jaw are gathered at the point C, which is always front, back, up, down, left and right. Move, and the yarn becomes an equilateral triangle when it is at rest. Chene and Sim studied the effect of strip width and twist coefficient on cotton siro spinning. It is believed that for cotton combed yarn, the amount of yarn hairiness is affected by the spacing of the strands under the condition that other process parameters are kept unchanged. Larger, the appropriate strip spacing must be determined. Due to the inconvenient spacing of the strips of the jaws before the test, the test uses the pitch-adjustable bell mouth for the spacing of the strips. The difference between the static test is shown in Table 2 (where the front jaw spacing is the center distance of the two strips). Table 2: Center distance between the mouth of the mouth and the distance between the front jaws/mm. Static test value of the bell mouth. Center distance from the front jaw spacing of the gaps. A5=+i: AS,=0.557, variance = +1 :(AS,-AS)2=0029524, so it is convenient to replace the center distance of the front jaw with the center distance of the bell mouth, which is only slightly different. When the center distance of the bell mouth is less than 7mm, the distance between the strips is difficult to measure, and when the strip is very close, it is close to the conventional ring spinning. Therefore, the spacing of the starting bell mouth of the test is 7mm. At the same time, the trial spinning found that When the center distance of the bell mouth exceeds 13mm, the two strips of the front jaw become extremely unstable, and the broken head increases, and the operator is difficult to handle the broken head. Therefore, the center distance of the bell mouth used in this test is 7~ 13mm. In order to investigate the influence of the center distance of the bell mouth on the yarn hairiness, different bell mouth center distance spinning, spinning varieties and spinning process parameters are shown in Table 1 (where the roving twist coefficient, spindle speed, and rear draft ratio are Optimization value). The center distance of the bell mouth and the number of hairiness of 3mm and above are as shown. It can be seen from the figure that the yarn hairiness decreases as the center distance of the bell mouth increases, and reaches a minimum when the center distance of the bell mouth is 13 mm. At this time, the hairiness of the yarn is compared with that of the original ring spinning. See Table 3. Project hairiness comparison hairiness length/mm linear density hairiness length linear density looper yarn/siro yarn/3 test result analysis 3.1 The effect of the twisted yarn on the number of yarns in the yarn is evident from Table 3. Under the condition that the parameters of the yarn are completely the same, the yarn hairiness of the siro-silver sulfonamide is significantly reduced compared with the conventional ring spinning. From the number of hairiness below 3mm, the effect of siro spinning on reducing the number of short hairiness is not obvious, and for long hairs of 4mm and above, the effect of siro spinning on reducing the hairiness of the yarn is quite obvious. Long hairiness of 8mm and above is almost zero. This is mainly because the two single yarns are easier to capture for long hairiness, and the capture of short hairiness is more difficult. 3.2 Influence of the center distance of the bell mouth on the hairiness of the yarn In the scope of this test, the influence of the center distance of the bell mouth on the yarn hairiness is obvious. In general, for the same yarn, under the same process and environmental conditions, the number of yarn feathers decreases as the center distance of the bell mouth increases. For the 51mm equal length cut polysulfonamide fiber, when the bell mouth diameter is increased from 7mm to 9mm, the yarn hairiness is reduced, but the reduction is not large. When the bell mouth diameter is increased from 9mm to 11mm, the yarn hairiness is reduced. The magnitude is relatively large. It can be seen that the slope of this segment is relatively large. However, when the center distance of the bell mouth is increased from 11 mm to 13 mm, the reduction of the yarn hairiness is not much, and the slope of this section is relatively small. 3.3 The relationship between the number of yarns of different siro spinning yarns and the linear density of yarns It can be seen from Table 3 that different yarn linear densities are different in the number of yarn hairiness, and the higher the linear density, the more the number of hairiness. The performance of this aspect is related to the research conclusion of traditional ring spinning. In addition, the actual test found that for the same number of yarns, when the same bell mouth center distance is used, the yarn has more yarn hairiness when the yarn is large. 3.4 Stability of the yarn forming point When spinning the same number of yarns, the yarn forming point C is relatively stable when it is 11 mm or less. Although it moves up and down and left and right, the amplitude and frequency of movement are not large. When it exceeds 11 mm, Especially after more than 12 mm, the C point becomes extremely unstable, and the breakage is markedly increased. This shows that the stability of point C has little to do with the number of spinning numbers. 4 Conclusion Through the above tests and analysis, we can conclude that the polysulfonamide fiber has many excellent properties and is a high-performance fiber that needs to be developed in China. Siro spinning is an effective spinning method to reduce yarn hairiness. The method has obvious effects on reducing the number of yarns of the sulfonamide fibers. In particular, it is most effective in reducing the long hairiness of the yarn of the polysulfone fiber. Within the test range, the number of yarn feathers decreased with the increase of the center distance of the bell mouth, but the effect of reduction after 11 mm was not obvious. Under the tested process conditions, the center distance of the bell mouth is 11 mm, which is the stable point of yarn formation. It is recommended that the roving twist coefficient is too large. This is because the roving is reduced in weight. When unwinding on the spinning frame, it is bound to increase the chance of the roving break after the machine. The appropriate large roving coefficient is beneficial to increase the roving strength and reduce the yarn hairiness. There are also benefits. The drafting ratio of the spun yarn should be underestimated and controlled below 45 times in order to reduce the drafting wave formed when the two strands are simultaneously drawn in the drafting zone of the spun yarn. The traveler configuration should be as heavy as possible. 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