FORFARANDE FOR ELEKTROSTATISK YTBELEGGNING AV FOREMAL SOM HELT ELLER DELVIS BESTAR AV ISOLERMATERIAL

摘要

The invention relates to a process for the electrostatic coating of workpieces which are completely or partly composed of insulating material. In electrostatic coating, the coating material is applied to the workpiece in powder or other freely-flowing form, using the forces of an electrical field, and dried or melted (fused) in subsequent heat treatment. An electrostatically semi- conductively acting surface having a surface resistance of 10<9> to 10<12> ohms is produced in a workpiece to be coated. Such a surface may be provided by coating with quaternary ammonium compounds or by incorporation of quaternary ammonium compounds into the substrate. Thereafter a coating of a powdery or other free-flowing material is applied with the use of coating appliances using the principle of creating an ionized cloud of electrically charged particles of atomized coating material to effect coating of the surface of said workpiece.