| 摘要 |
Disclosed is a process for forming a coating on a substrate, comprising: (a) establishing a fluidised-bed of a powder coating composition, thereby effecting tribostatic charging of the powder coating composition, the fluidised-bed including a fluidising chamber at least a part of which is conductive, (b) applying a voltage to the conductive part of the fluidising chamber, (c) immersing a substrate which is either electrically non-conductive or poorly conductive wholly or partly in the fluidised bed, whereby tribostatically charged particles of the powder coating composition adhere to the substrate, the substrate being either electrically isolated or earthed, (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, the process being conducted without ionisation or corona effects in the fluidised bed.
|
