Yarn evenness parameters evaluation : a new approach

Abstract

This paper presents MPSI (Mass Parameterization System), an automatic system for determination of mass characteristics of textile yarn. It is based on 1 mm parallel capacitive sensors, working online or offline. This new approach allows direct measurement of yarn mass in the 1 mm range (increasing the revolution by eight times) [Pinto, J.G., Dissertação de Mestrado, Minho University, 2004; Baxter, L. Capacity sensors: Design and applications, IEEE, Press, 1997]. Aquisition and data processing are performance in Labview from National Instruments. All parameters commonly used in the textile industry are determined for different values of sensitive defined interactively by the operator. In MPSI, the new parameters were used (integral of deviation rate [IDR%] signal processing techniques based on the fast Walsh-Hadamard Transform and on fast impulse frequency determination and others adapted (deviation rate [DR%], spectrograms, coefficient of variation [CV%], mean deviation [U], faults counting and extension) A new feature of this system is also the online automatic classification of mass parameters.