POWDER COATING (ELECTROSTATIC PAINTING) METHOD AND PLANT FOR NON ELECTRICALLY CONDUCTIVE ELEMENTS, AND IN PARTICULAR BRAKE PADS

摘要

A method and system for powder coating non electrically conductive elements, preferably brake pads. A pre-treatment station is upstream of an electrostatic powder coating deposition station and a baking station for melting and polymerizing the powder coating in order to form a coating layer on a surface to be coated. The pre-treatment station causes the elements to be coated to conduct electrically by uniformly wetting said elements by means of creating poorly mineralized water covalent bonds on at least one surface to be coated, in an amount aimed at producing a measurable weight increase in the non electrically conductive elements, which then causes them to conduct electrically. The water adsorbed and/or deposited is subsequently eliminated within the baking station.

主权项

1. A method for powder coating of electrically non conductive elements, in particular brake pads, comprising:
pre-treating electrically non conductive elements to be made conductive on at least one surface thereof to be painted; electrostatically depositing a painting powder on the surface to be painted; and baking, in which the painting powder is melted and polymerized to form a coating layer on the surface to be painted wherein the pre-treating step includes uniformly dampening at least the surface to be painted and, each entire electrically non conductive element, by covalent retention of water, to such an extent to produce a measurable increase of weight of the electrically non conductive elements, such as to make such elements electrically conductive; the water retained on the electrically non conductive elements being subsequently eliminated at least in part during the baking step.