Electrostatically Assisted Fluidised Bed Coating

In the so called EFB (Electrostatic Fluidised Bed) process the powder is fluidised in a bed using ionised air.

This causes an electrostatic charge to be imparted to the powder. When the earthed objects are immersed in the fluidised bed, excellent coverage occurs, even into areas where penetration would normally be prevented by the Faraday cage effects.

The powder is then cured by passing the work piece through an oven. Since the object to be coated is not pre-heated, it is possible to electively remove excess areas of powder application, should these occur, by blowing or suction. This powder can then be re-introduced into the fluidised bed.