An apparatus for assessment of technical textiles electrical behavior

An arrangement consisting of two methods for determination of textile materials electric resistance has been developed. One of them is based on the measurement of the current intensity through the examined sample, and the other one on recording the discharging dynamics of a capacitor through the sample. The facilities for testing textile materials in fiber, yarn and fabric form qualify this equipment as useful and reliable for examination of both apparel and technical textiles

AN EXPLICIT CALCULATION OF RELATIVE SURFACE DEFORMATION DURING BURSTING TEST OF FABRICS

A mathematical approach to the setting of a new model of knitted and other loose textile surfaces deformation during a ball-bursting test is presented. The dependence of ball traverse length is defined in an implicit manner by an exact system of equations. A procedure for the development of the corresponding explicit dependence has also been proposed. The new model is proved by experimental results as correct and applicable in a simple way to all possible values of the ball traverse length in ball bursting tests

INVESTIGATION OF DIELECTRIC PROPERTIES AND ELECTRIC RESISTANCE OF SOME TEXTILE MATERIALS

It is well known that textile materials are mostly dielectrics. Dielectric properties of textile materials condition the phenomenon of static electricity during their contact with other objects. This often has a negative influence upon the behaviour of textile materials both in their use and processing. The data that dielectric properties (tangens of losses and relative permittivity) of textile materials as well as their electrical resistance are in direct relation with their inclination to generate and dissipate static charges makes the determination of these indicators (electrophysical properties) up-to-date. In this work, the temperature dependence of dielectric tangens of losses for specimens of cotton, wool, polyester and cotton-polyester mixture have been recorded. The measurements have been carried out at temperature range from -50°C to 50°C in electric periodic field at test frequency 1MHz in vacuum. For the same specimens the values of dielectric tangens of losses and relative permittivity have also been measured at air temperature of 21 ± 1°C and at relative humidity 35%. These data have been compared with the values of resistance measured under the same conditions and the compatible results have been obtained