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Electrostatic painting of plastics using metal backing

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2 Author(s)
Elmoursi, A.A. ; Gen. Motors Res. Labs., Warren, MI, USA ; Garner, D.P.

This work explains theoretically and experimentally the fundamental differences between spraying metal and plastic panels electrostatically. Mechanisms of charge dissipation from plastic surfaces are discussed and a simple method is proposed for determining the electrostatic sprayability of plastic substrates. Using a 1-D analytical model, it is shown that the effect of charge accumulation can be minimized by appropriately placing a grounded metal backing behind the plastic substrate. Experiments were conducted in a spray booth environment and the results showed good agreement with those predicted theoretically. Special metal backings with indentations and gaps were used to study the effect of a mismatch between the plastic substrate and its metal backing on the quality of the paint finish

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Industry Applications, IEEE Transactions on  (Volume:29 ,  Issue: 6 )