Impact charging of insulators

Abstract

Impact charge and area of a Nylon66 particle (3.18 mm in diameter) by a single impact on plastic plates (PTFE and PVC) were measured under various impact speeds ν i (3.46–14.6 m/s) and impact angles θ (20°–80°). Before the measurement, the charge on the plastic plates was reduced to about 10%-1% of the charge previously accumulated on the plates by heat treatment in N 2 gas. In the case of collision with a PVC plate, the impact charge density σ i of the Nylon66 particles was +1.67 × 10 −4 C/m 2 which was almost constant for the charge in θ and ν i. In the case of collision with a PTFE plate, it was changed from +0.35 × 10 −4 C/m 2 to +1.90 × 10 −4 C/m 2. It decreased with an increase in the vertical component of the impact speed ν i cos θ and increased with an increase in the horizontal component of the impact speed ν i sin θ. These results are interpreted in terms of wear of PTFE. The impact charge and the area were almost the same values as those obtained by the impact on the metal plate.