Powder coating process using a fluidized bed effecting tribostatic charging of powder coating composition

摘要

A process for forming a coating on a conductive substrate comprises: a) establishing a fluidised bed of a powder coating composition thereby effecting tribostatic charging of the powder coating composition; b) immersing the substrate wholly or partly within the fluidised bed; c) applying a voltage to the substrate for at least part of the period of immersion whereby charged particles of the powder coating composition adhere to the substrate; d) withdrawing the substrate from the fluidised bed and e) forming the adherent particles into a continuous coating over at least part of the substrate.