Research on Spinning Technology for Reducing the Hairiness of Arylsulfone Yarns Using Siro Spinning Technology GAO Jun WANG Fuqiu 2 (1. Shenyang Textile & Light Industry Institute, Shenyang 110034, China; 2. Huaibei No.1 Textile Co., Ltd., Huaibei, Anhui Province 235000) The number of yarn hairinesses, especially the number of long hair feathers above 4mm; and it was found that for the tested arylsulfone fibers, 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 technological measures.
The aryl sulfone fiber belongs to the para-aramid series. The scientific name is polyphenyl sulfone terephthalamide fiber, which is composed of 4,4 diamino diphenyl sulfone, 3,3 diamino diphenyl sulfone and terephthaloyl dichloride. Polycondensate made of fiber. It has excellent heat resistance, electrical insulation properties and chemical stability, and can be widely used in aviation and other fields, high temperature work environment protection and other civilian areas with flame retardant requirements, is our country has independent intellectual property rights of high temperature Flame-retardant fibers have good application prospects. However, the fiber yarn is more serious hairiness, affecting the quality of the yarn and the final fabric feel. In this paper, a spinning test on a Sirospur machine modified by a traditional ring spinning machine was conducted to study the reduction of the yarn hairiness of sulfone fibers.
1 Siro spinning technology Siro spinning technology is a new spinning method invented by the Australian Institute of Wool Industry~in 1976 and jointly developed with the International Wool Bureau (IWS). It is a method of spinning, doubling and twisting yarns. The new spinning method is completed. The principle of its yarn see. It feeds two rovings A, B at a certain distance on a spinning machine. After drafting, the front rollers output the two single yarn strips, and the single yarn strips have a small amount due to the transfer of twist. The twists, the two strands were merged and further twisted into a strand-like race winding wind and was wound on a bobbin to become a winder. This yarn has high strength, low hairiness and smooth yarn surface.
Plate(1) etc. reduced the hairiness of Siro spinning to the capturing effect of two single yarns on hairiness, as shown. From the twisting process of Siro spinning, it can be seen that the two slivers of the yarn are first strengthened and then strengthened. This special twisting process makes the sliver pass twice during the yarn formation process. Twist so that there are two opportunities for the fiber to be licked at the head or tail end. In addition, the amplitude of the single strands obtained when they are twisted before the joining point is small, and the torsion of the strands is small, and the chance that the fiber ejects the yarn body becomes hairiness is small. Even if the fiber is ejected at this time, the yarn body becomes a temporary hairiness. After the merging of the two slivers and twisting in the same direction, the hairiness still has a chance to be wrapped in the yarn body, thereby ensuring that the surface of the yarn body is smooth and the hairiness is less.
The actual performance is high yarn strength and a significant reduction in hairiness.
2 Spinning test 2.1 Experimental raw materials Fibers were sulfone fibers produced by Shanghai Synthetic Fiber Research Institute. The specifications were 2.0dtexx51mm isometric cutting, the number of crimps was 4/cm, the oil content was 0.2%, the moisture regain of the fibers was 6.2%, and the fibers were dry. The state breaking strength is 3.4 cN/dtex and the dry-state breaking elongation is 21% (temperature 20, relative humidity=65%). The fibers were pretreated with antistatic agents prior to injection.
The yarn process route is: A002C type cotton catcher A006C type blender? A036 type porcupine type opener A092 type feeder A076A type coiler A186Z type carding machine FA305C type draw frame A456D type roving frame.
2.2 Test equipment The Siro spinning machine modified from the FA503 spinning frame uses an adjustable double-slot bell mouth as shown. Spinning machine process parameters such as the fineness of the twist coefficient of the rear zone draft / clamp jaw distance /mm spindle speed number of laps cradle pressure (before the X middle X) / daN double spindle - Della roller gauge 2.3 Hairiness test instrument and test standard test instrument is YG172 type yarn hairiness tester. Test methods and conditions are based on standard FZ/T01086-2000.
2.4 Test methods and content Tests have found that when spinning at the centre of a bellmouth, the yarn point C, which is the point where the two slivers of the front jaw gather, is always before, after, up, down, left and right. Move, and the yarn becomes equilateral triangle at rest. Chene and Sim studied the effect of the width of the sliver and the twist factor on the cotton siro spinning. It is believed that for the cotton combed yarn, the yarn hairiness is affected by the spacing of the sliver while maintaining the other process parameters unchanged. Larger, must determine the appropriate sliver spacing.
Because the spacing of the slivers of the jaws before the test is inconvenient, this experiment uses pitch-adjustable flares to control the sliver spacing. The gap in the static test is shown in Table 2 (where the distance between the front jaws is the center distance between the two bars).
Table 2 The distance between the center distance and the distance between the front jaw and the jaw/mm Item Static test value The distance from the center of the bell mouth to the distance between the jaws of the front jaw Spacing distance Difference in mean A5 = +i: AS,=0.557, variance = +1 :(AS,-AS)2=0029524, so the center distance of the flare can be conveniently used to replace the center distance of the front jaw. There is only a slight difference between the two.
When the center distance of the bell mouth is less than 7mm, the sliver spacing is difficult to measure. Moreover, when the sliver is very close, it is close to the traditional ring spinning. Therefore, the pitch of the beginning horn of the test is 7mm. At the same time, the test spinning is found. When the center distance of the bell mouth exceeds 13mm, the two slivers in the front jaw become extremely unstable, and the breakage increases, which makes it difficult for the driver to handle the breakage. Therefore, the center distance of the bell mouth used in this experiment is 7~. 13mm. In order to investigate the influence of the center distance of the bell mouth on the yarn hairiness, different center flares of the bell mouth are used for spinning. The spinning parameters and the spinning process parameters are shown in Table 1. (The roving twist coefficient, spindle speed, and draft ratio in the rear zone are Optimized value). The distance between the center of the bell mouth and the hairiness of 3mm and above is as shown. It can be seen from the figure that the yarn hairiness decreases with the increase of the center distance of the bell mouth and reaches the minimum value when the center distance of the bell mouth is 13mm. The hairiness of the yarn at this time is compared with the hairiness of the conventional ring spinning. See Table 3. Item Number of Hairiness Comparison of Hairiness Length/mm Line Density Hair Length Length Linear Density Loop/Spindle/3 Test Results Analysis 3.1 Competition The effect of the convolution spinning on the yarn hairiness number can be clearly seen from Table 3. Under the condition that the spinning yarn process parameters are completely the same, the yarn hairiness of the sirofiber aryl sulfone is significantly reduced compared with the conventional ring spinning yarn. Seeing from the number of hair feathers below 3mm, Siro spinning does not have a significant effect on reducing the number of short hair feathers, but for long hair feathers of 4 mm or more, the effect of siro spinning on the reduction of yarn hairiness is quite obvious. Hairy feathers of 8mm and above are almost zero. This is mainly because the capture of long hairs by two single yarns is relatively easy, while the capture of short hairs is difficult.
3.2 The influence of the center distance of the bell mouth on the yarn hairiness In the scope of this experiment, the influence of the center distance of the flare mouth on the yarn hairiness is obvious. In general, for the same yarn, under the same process and environmental conditions, the yarn hairiness decreases as the center distance of the bell mouth increases. For 51mm isometric cut aryl sulfonylon fibers, when the bell mouth diameter increases from 7mm to 9mm, the hairiness of the yarn decreases, but the decrease is not significant. When the bell mouth diameter increases from 9mm to 11mm, the yarn hairiness decreases. The magnitude is relatively large. It can be seen that the slope of this section is relatively large. However, when the center distance of the bellmouth increased from 11mm to 13mm, the reduction of yarn hairiness was not significant, and the slope of this section was relatively small.
3.3 The relationship between the number of yarns and the yarn linear density of different siro-spun yarns It can be seen from Table 3 and obviously that the yarn yarns of different yarns have different yarn hairlines. The greater the linear density, the greater the number of hairs. The performance in this area is in line with the findings of the traditional ring spinning study. In addition, actual tests have found that when using the same flare center distance for yarns of the same number, the yarn becomes more hairy.
3.4 Stability of Yarn-spun Yarn When spinning yarn of the same number, the yarn-forming point C is relatively stable at 11mm or less, although it moves up, down, left and right, but the magnitude and frequency of the movement are not large. When it exceeds 11mm, Especially after exceeding 12mm, point C becomes extremely unstable and the breakage increases significantly. This shows that the stability of point C has little to do with the number of spins.
4 Conclusion Through the above test and analysis can be concluded as follows: sulfonyl sulfone fiber has many excellent properties, is China's need to focus on the development of high-performance fiber.
Siro spinning is an effective spinning method that reduces yarn hairiness.
The method has obvious effect on reducing the hairiness of the aramide fiber. In particular, it has the best effect on reducing the long hairiness of aramide fiber.
Within the scope of the test, the number of yarn hairiness decreases with the increase of the center distance of the flare, but the reduction effect beyond 11mm is not obvious. Under the experimental conditions, the flare center distance of 11mm is the stable point of yarn formation.
It is recommended that the roving twist coefficient is too large to master. This is because the quantitative reduction of rovings will undoubtedly increase the chance of breakage of the roving after the machine is unwinding. The appropriately large roving twist coefficient is conducive to increasing the roving strength and reducing the yarn hairiness. There are also benefits.
The draft multiple of the spun yarn should be controlled to be less than 45 times. The purpose is to reduce the draft waves formed when the two slivers are drafted simultaneously in the drafting area of ​​the spun yarn.
The traveler configuration should be as heavy as possible. In this way, once a single yarn breaks, the other single yarn will inevitably break between the ring and the traveler, which will reduce the chance of single yarn and will also be beneficial for reducing hairiness.
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