The impact charging of polymer particles

Publisher： VSP

ISSN： 1568-5527

Source： Advanced Powder Technology, Vol.2, Iss.4, 1991-01, pp. : 277-284

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Abstract

To investigate the charge exchange process that occurs when a particle impacts onto a surface spherical particles of nylon, polyacetal and teflon were fired at a brass target at velocities up to 40 m s^-1 and at various angles. To extend earlier work a space-charge field was simulated at the surface of the plane brass target by a nearby spherical electrode which was raised to a high potential. For the first time experiments were carried out with the target at elevated temperatures up to 230°C. The presence of a tangential component of impact velocity was found to be highly significant, indicating that particle rotation and friction have a profound influence on charge levels resulting from impact. Particle impact in the presence of an electric field can have a dominant effect upon impact charge although charge levels tend to a limit at high field levels. Over the restricted temperature range and with the limited number of materials tested the observed impact charging did not depend significantly upon temperature.