Process for producing coatings on electrically conducting substrates and apparatus for making the same

摘要

It is used to form the coating in a conductive substrates, method, the following steps are included: establishing a fluidized bed of a powder coating composition, therefore the tribostatic chargings of powder coating composition are influenced, fluidized bed including a fluidising chamber is conductive at least part, apply a voltage to the conductive part of fluidising chamber, completely or partially substrate is immersed in fluidized bed, therefore the charge particles of powder coating composition are attached to substrate, also on the substrate be electrically isolated or be buried in the earth, substrate is withdrawn from fluidized bed and the particle that attachment is formed at least partly substrate enters a continuous coating. Process provides advantage for coated substrate region, is inapproachable in conventional electrostatic powder coating process because of Faraday shield effect, and than being the composition for being able to carry out thinner coating as obtained by conventional fluidized cooling bed process. Further advantages include the uniformity and speed of coating.