Electrostatic powder spray coating method
US5928731A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jun 3, 1997 |
| Grant date | Jul 27, 1999 |
| Priority date | — |
| Expiry date | Jun 3, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B5/0533
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A high voltage generated by a high voltage generator is applied to corona electrodes, and powder supplied from a powder flow passage collides against a diffuser main body while being moved in a vortex by air ejected from a vortex air introduction port and is ejected from a nozzle opening. After the powder is charged by ions generated by corona discharge, it is sprayed to an object to be coated. Free ions generated by the corona discharge are trapped by ion trap electrodes. The adhesion of the powder can be prevented by the ejection of compressed air through a diffuser front portion cover and an outer cylinder cover each composed of a porous member and the ejection of compressed air from a nozzle hole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.