Method for varying nozzle traversal speed to obtain uniform thickness electrostatically spray coated layers
US5114736A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 27, 1989 |
| Grant date | May 19, 1992 |
| Priority date | — |
| Expiry date | Dec 27, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05D1/04
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method and apparatus for electrostatically spray coating substrates with layers of material having uniform thicknesses is provided. A substrate to be coated is electrically grounded and an electrically charged, atomized spray of coating material is directed toward the substrate from a nozzle. The nozzle is traversed along a length of the substrate, which can also be rotated, to coat substantially the entire surface of the substrate. In order to compensate for thickness variations in the applied coating, the speed of traversal of the nozzle is varied. In a preferred embodiment, where photoreceptor drums are produced by spraying a photoreceptor material onto a cylindrical substrate, the speed of traversal of the nozzle is reduced as it approaches at least one end of the cylindrical substrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.