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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