The Influence of Yarn Twist Technology on Yarn Strength and Quality

The process adjustment of yarn twist not only affects the single yarn breaking strength and single yarn breaking elongation, but also causes the yarn linear density, evenness, thick knots, details, neps, hairiness and other factors. Yarn twists vary depending on the degree of twisting; in the daily twist process adjustment, not only the twist change must be paid attention to, but also the relevant changes in the overall quality of the yarn due to the twist process adjustment.　　　　 twist is a parameter to measure the degree of twisting of the yarn, and it is the basic condition for yarn forming and winding to give the yarn strength. Usually in the adjustment of the yarn twist process, for a long time only the effect of twist change on the single yarn breaking strength and single yarn breaking elongation is concerned, or the twist change on the yarn linear density, evenness uniformity CV%, CV%, The causal relationship of thick knots, details, neps, hairiness and other items; ignores the influence of yarn twist changes on other yarn quality changes, and fails to take comprehensive quality control measures, which causes customers to be dissatisfied with yarn quality. Undeserved trade losses.　　 This article selects a set of samples based on the conventional varieties of textile enterprises, sets different levels of twist on the same sample, and takes samples for various tests to compare and analyze the effect of twist changes on the overall quality of the yarn.　　　　 yarn different level twist comparison test 　　1, sample selection 　　 C14.6texT, CJ14.6texT, C14.6texK, T35/C35 13.1texT, T80/C20 13.1texT, C27.8texT. Within the normal twist range of each variety, in order to compare the quality changes brought about by different twists of the yarn, the twist of each variety is set to three levels of high, medium, and low, and samples are taken separately. In order to enhance the comparison of the test and reduce the influence of accidental factors on the comparison of the test, each group of samples takes ten bobbins at different levels; 30 bobbins for each type, 　　2, the implementation standard and the test equipment are evenly dry CV% value, thick knots, details and cotton knots are inspected using: GB/T3292.1-2008, evenness tester; 　　 hairiness inspection using: FZ/T01086-2000, YG172A yarn hairiness tester; 　　 single yarn break Strength inspection adopts: GB/T3916-1997, YG063T automatic single yarn strength tester; 　　 linear density inspection adopts: GB/T4743-2009, Y802A eight blue oven, EL-200S precision electronic balance; 　　 twist inspection adopts: GB/T2543. 2-2001, YG156 automatic twist tester.　　3, temperature and humidity　　temperature: 20±1.0℃　　humidity: 65±2%RH　　4, inspection times　　In order to reduce the influence of the dispersion of different fragments of each group of samples on the test results, the test results of each sample are compared and analyzed with the average value. The number of inspections at different levels of each sample is (see Table 1) 　　 linear density shake 100m per tube, a total of 10 times; 　　 twists 2 times per tube, a total of 20 times; 　　 single yarn breaking strength 2 times per tube, a total of 20 times; The evenness test is performed at 400m/min, each tube is 1min, and it is done ten times; the hairiness test segment length is 30m, the test speed is 30m/min, each tube is 1 minute, and the test is done 10 times. This test only counts 1mm, 3mm, 5mm, 7mm hairiness index.　　5, test results 　　 test results are shown in Table 1 Different twist yarn quality changes 　　　　Analysis 　　 From Table 1, it can be seen that the yarn linear density, single yarn breaking strength, evenness, hairiness, etc. change with the change of yarn twist. As far as twist changes are concerned, the overall quality of the yarn is uncertain. Although the range and trend of changes in different twists and different varieties are not the same, the change in yarn quality due to twist can be determined.　　 1 twist and yarn strength 　 　 after twisting, the fiber is in close contact and not easy to slip. Generally, the yarn breaking strength increases with the increase of twist within a reasonable twist coefficient range. This is because as the twist increases, the frictional resistance between the fibers increases, which increases the strength of the whisker during the breaking process, so the single yarn breaking strength will gradually increase within a certain twist range. After the single yarn breaking strength reaches the maximum value (the corresponding twist is called the critical twist) and then twisted, the twist angle of the fiber also increases, which reduces the effective component force that the fiber itself can withstand in the axial direction of the fiber. In addition, excessive twist increases the uneven distribution of fiber stress in the inner and outer layers of the strands, aggravates the disparity of fiber breakage, and reduces the strength of the fiber itself, so that the single yarn breaking strength after the critical twist shows a downward trend (the criticality of different types of yarns) The twist is different). T65/C35 13.1tex T single yarn breaking strength changes with twist coefficient (see Figure 1).　　2, twist and linear density 　　3.2.1 Twisting to form a twist and shrinkage 　　beard strands are processed in the previous process, and the originally straight and parallel fibers are inclined with the yarn axis, and the fibers are arranged in a spiral on the strands. The twisting degree of the whisker is different, and the bending of the fiber in the whisker is different. The yarn segment increases due to the increase in the twist of the yarn. Twist and shrink. The relationship between twist coefficient and twist shrinkage ratio (Figure 2).　　3.2.2 Twist and shrinkage and linear density 　　 Generally, as the twist of the yarn increases, the linear density tends to increase.

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