Abstract

The maximum value of the surface potential or of the related equivalent voltage of perforated dielectric sheets may be of special interest in application of materials such as electrostatic-polymeric electret filters, fabrics, non-wovens and others. Experimental investigations carried out on polymeric fabrics with application of the corona triode have shown that the surface potential is limited mainly by the back ionization (back corona) phenomenon. It was also shown that the corona triode may be a very useful tool for characterisation processes which occur in such materials. Particularly a simple correlation was found between the maximum value of the surface potential and the threshold voltage (i.e. the voltage of the discharge current increase of the sample polarised in the corona triode system)

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