P.M.D. & CV% of Yarn || Study With Param || Parmanand
Mathematical Expression of Yarn Irregularity or Mass Variation
Generally, two parameters are used to express the irregularity of yarns. They are…
1. Percentage of mean deviation (PMD) or Unevenness (U%)
2. Coefficient of variation CV%
Percentage of Mean Deviation (PMD) or Unevenness (U%)
The average value for all the deviations from the mean which is expressed as a percentage of the overall mean is called the percentage of Mean Deviation (PMD). This is termed Um% by the Uster Company.
Coefficient of mass Variation (CV%):
The coefficient of mass variation CV % is the ratio of the standard deviation of mass variation divided by average mass variation. The higher the CV value is the more irregular the yarn.
Today I Parmanand is here to explain one of the important aspects of the P.M.D.& C.V.% of yarn.
I hope you will like the content which is explained in easier ways.
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Testing of Bowing or Skewing in the Fabric
• Testing of Bowing or Skewing in the Fabric...