Indirect charging electrostatic coating apparatus
US5039019A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 1, 1990 |
| Grant date | Aug 13, 1991 |
| Priority date | — |
| Expiry date | Aug 1, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B5/0403
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Electrostatic coating apparatus including apparatus for establishing an electrostatic field for indirectly charging atomized droplets of paint or other coating material discharged from an atomizer. A flexible tube is formed into an annulus and is positioned coaxially with the atomizer. Pins extend through the tube and have short ends which project towards a workpiece to be coated. The tube is formed from an insulating outer layer and a semi-conducting inner layer having a high distributed resistance. The pins extend through the inner layer which is connected through a large resistance to a high voltage power supply. The apparatus is particularly useful for charging electrically conductive and semi-conductive materials delivered to the atomizer from a grounded source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.