Development of a New Evaluation System of Frictional Static Charge

Part 2: Dependence of Electro-Static Properties of Various Fibers upon Temperature and Humidity

Abstract

In part 1^[1], the reproducibility and accuracy of newly developed KB system were compared with those of Rotary Static Tester (RST) and Faraday's Cage Method in JIS L 1094 (1980). It was proven that the KB system has a higher reproducibility and a higher accuracy than these existing measuring methods.
The temperature and humidity dependence of frictional charge and it's decay rate of various kinds of fabrics, which are composed of natural fibers, antistatic synthetic fibers and non-antistatic synthetic fibers, has been investigated by the KB system. It has been found that the static properties of the fibers change remarkably at the relative humidity of 40% to 60%, and any significant difference of static properties of the fibers is not seen between 20°C and 25°C of measuring temperature. It was concluded that the optimum temperature and humidity to measure the static or antistatic properties are 25°C and 30%RH to 35%RH from the view point of accuracy, stability and practical measurement.