dty 600D/192F

Viewed with the harmonic scale, 3. At this time, we can combine the uneven curve graph and the DR% curve according to the characteristics of the spectrogram. The wavelength of the main defect represents the occurrence of the yarn defect The length of the cycle, the half of the maximum harmonic length of the amplitude is the average length of the thick nodes or details, and the grading position of the defects on the scatter diagram represents the size of the coarse details

(the corresponding defects can also be obtained from the incident report of the electric clear Specific data, including thickness and length parameters).' This passage is used by many technicians as a 'standard' for defining whether periodic defects are harmful. This can also correspond to the alarm data in FIG. The top envelope of the main wave and harmonics is similar to the parabola, and the dty 600D/192F largest amplitude is the 9th harmonic Wave, forming harmonic accumulation before 50cm. portant;' />

Figure 13 The effect of yarn clearing curve on the display status of defects According to the above comprehensive analysis of the graphics, it can be judged that the positive and negative bidirectional pulse waves are caused by defects of the type of damage to the rotating parts. But if there is a non-sine wave type defect on the yarn, if such a standard is also used for judgment, it may cause misjudgment. According to the size distribution position and number of details of the detail yarn defect, adjust T clearing curve and set the detail alarm parameter TA (see Figure 9).

On the clearing scatter plot of the electric clearing, it can be seen that there is a clear accumulation of detailed cut flaws in the T interval (see Figure 8). The roving produced by this top roller was subjected to a sliver test and found that there were mechanical waves at 2.3m should be the main wave, and the other waves are harmonics, between 0. The characteristics of the spectrum, unevenness curve and DR% curve can confirm that the periodic defects on the yarn are bidirectional impulse defects. For defects in the nature of the sine wave, it is basically acceptable to use this 'standard' to judge whether it is harmful. 

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Texturing Yarns Manufacturers

The proportional Texturing Yarns Manufacturers between the mechanical wave and the fundamental wave is used to judge the harmfulness of the defect, and misjudgment often occurs.5, 4, 2.5, 2, 1. The spectrum, uneven curve, DR% curve, length-variation curve, linear density spectrum, cutting defect classification Figures are shown in Figures 22-27 respectively. portant;

The length-variation curve of the problem package portant; The DR% curve of the problem package Figure 03 Conclusion Non-sinusoidal periodic defects due to the Fourier In the process of leaf decomposition, it will be decomposed into a series of superposition of sine waves, especially as the distance between defects increases,

the average amplitude of the main wave will be affected, which will bring adverse factors to the analysis of the spectrogram.' (that is, detail yarn) will be displayed. Due to the poor yarn guide stroke and incorrect positioning of the frame, the whisker has almost no margin on the front top roller, and some fibers in the whisker are not effectively controlled by the front top roller,

resulting in a small thickness during the drafting process Adjust the yarn guide stroke and the positioning of the cradle so that the whisker runs in the middle of the front top roller, re-test the yarn sliver, and the shape of each pattern returns to normal, confirming that the problem is caused by the poor control of the fiber operation in the drafting zone

The shelling of the front rubber roller will also cause similar problems, see Figures 31-33.5 Case analysis of sprinkling of package yarn When an enterprise is doing R39. In the above example, another spindle of the same model and the same variety was found to have damage to the lower apron. According to the calculation formula of the spectrogram, the regular mechanical wave wavelength caused by the abrasion of the apron under the yarn is 83mm×3. 2.33/1. As the surface yarn of the yarn is gradually unwound, the moisture regain rate of the yarn tends to be stable, so the graphics 

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Magnolia Polyester Yarn

The main tasks of the preparation Magnolia Polyester Yarn: (1) Initially improve the parallel straightness of the fiber. The third preparation process method has been widely used because of the large number of merging and total draft, which improves the uniformity of small rolls and fiber straightness, and is more conducive to combing by the comber. Combing The quality control points of the preparation process (1) The quality of the small rolls is better. Combined with the test of the nodding content, reasonable control of the nodding rate, as low as possible under the premise of meeting the quality requirements. (3)

The amount of small rolls should be reasonable. (4) Merging, uniform mixing and strip feeding The combination of times makes the fibers in different slivers fully mixed and uniform; and it is made into combed slivers for processing in the next process. ② Normal law, Whether feeding cotton forward or backward, the length of the cotton is long, the output is high, and the quality of the web is poor; the length of the cotton is short, the output is low, and the quality of the web is good. (2

) Made into uniform small rolls Produced into large-capacity, quantitatively qualified, neat edges, small and uniform cotton rolls for the comber. Testing the quality of the combed sliver according to the cycle to reduce the difference in the table and the eye is an effective means to control the quality of the combed sliver.The product quality control of cotton spinning enterprises is a continuous, complex and interrelated textile system project. The output is high when the quantification is high, but it affects the carding quality. The quality of the combed sliver is positively correlated with the quality of the finished yarn.

The small rolls must have a uniform structure, clear layers, non-stick rolls, and good fiber orientation and straightness. (2 Eliminate impurities and neps in the sliver to reduce spun yarn ends and yarn defects, and improve the appearance quality of the yarn. It is important to control the number of combined roots and total draft multiples. (5) The main task of the comber to control the neps, impurities, and short pile rate of the combing bar is to eliminate the short pile , Neps and impurities. The backward cotton feeding method has a significantly higher rate of cotton fall than the forward cotton feeding method. 

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FLUFFY Polyester Yarn

The difference in neps in the Afis with and without top comb; the feeding method of different combers; suitable for the drop of fiber length (Ln of lap) Cotton scale and suitable doffing rate; sliver and roving strength; draw speed; roving roller gauge, etc. Check the company's Loepfe Mill Master ESY version of the alarm yarn chart (see Figure 12). 20 After solving the problems identified by the spring-loaded spring-free spinning one by one, a significant effect was achieved (see Fig..2. And the company will comprehensively promote the quality backtracking management system in other branches. After comparing 96 grains, the histogram comparison of electric yarn clearing defects is shown in Figure 26. Fig.2

. Figure 14 Insufficient FLUFFY Polyester Yarn of the elastic jaws in the front zone checks and rectifies the discovered problems one by one.3 Case 3: Solving the problem of high 140% neps in JC140S yarn Combed cotton 140-inch compact spinning produced by an enterprise, customer feedback 140% of the neps is too high, which affects the quality of the cloth. 17

Fluctuation curve of production efficiency Through analysis of the quality data of electric clearing, it is found that the yarn body is abnormal and there are many coarse details, especially the dense cutting defects at C1, C2, B1 and B2 (see Figure 18). Figure 12: The alarm yarn chart of Loepfe Mill Master ESY version checks the operating status and spinning process of the spinning equipment, and finds that there are mainly two problems: (1) The air supply pressure of the pneumatic cradle is unreasonable,

the standard pressure is 170cN, individual machines The measured pressure of the cradle reached 250cN (see Figure 13), which caused the abnormality of the sliver and neps data. Figure 25 JC140S yarn defect classification chart (after rectification) Through the comparison of data before and after rectification, we can see that after the reorganization of the combing equipment and the optimization and adjustment of the process, all indicators of yarn formation have improved significantly, including 140% of the neps data. Figure 21 Winding efficiency data after rectification 5.

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