Fluidized bed powder coating process utilizing tribostatic charging
US6280798A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 2000 |
| Grant date | Aug 28, 2001 |
| Priority date | — |
| Expiry date | Jul 24, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S118/05
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A process for forming a coating on a conductive substrate, which comprises establishing a fluidized bed of a powder coating composition, in which the mechanism for particle charging is tribostatic charging immersing the substrate wholly or partly within the said fluidized bed, applying a voltage to the substrate for at least part of the period of immersion, whereby particles of the powder coating composition adhere to the substrate, withdrawing the substrate from the fluidized bed and forming the adherent particles into a continuous coating over at least part of the substrate. The process enables the coating of substrate areas which, because of the Faraday cage effect, are inaccessible in conventional electrostatic coating processes, and also enables the formation of thinner coatings than are obtainable by conventional fluidized-bed processes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.