Influence of measurement length in yarn eveness control

Abstract

In order to be able to quantify yarn evenness, most of the testing instruments use the principle based on drawing the yarn under test between the plates of a condenser, so that the yarn and the air are the dielectric material that changes the capacitor characteristics, which is proportional to the mass of small lengths of the yarn (8mm). A mathematical study was made in order determine the yarn evenness in multiples of 1mm length in the range of 1 to 8mm. To analyse the influence of measurements lengths in the determination of yarn evenness, a statistical study was carried out. The results show that the ones obtained in 1mm length statistically influence the yarn mass variation.