Abstract
This paper compares capacitive and photoelectric method for measuring yarn evenness, and presents a new yarn unevenness on-line measurement system to detecting accurately yarn appearance diameter. By means of researching coefficient of diameter variation and mass variation, the relation model of variation coefficient is established, and the experimental data shows excellent correlation between coefficient of diameter variation and coefficient of mass variation and approximate linear relationship. The laser on-line measurement system of yarn evenness can accurately measure yarn diameter and calculate the coefficient of variation, which is suitable for the production field measurement.
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