Method and apparatus for depositing nonconductive material onto conductive filaments
US4795339A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 15, 1986 |
| Grant date | Jan 3, 1989 |
| Priority date | — |
| Expiry date | Apr 15, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B5/14
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An electrostatic filament coater comprising a plurality of coating chambers arranged coaxially in spaced apart serial relation. Each of the coating chambers has a base and an apex and being generally frusto-conical in shape with an exit opening at the apex and an entrance opening at the base. All of the coating chambers except the last one are positioned with the apex being within the base of the next adjacent coating chamber. The filament is trained through the coating chambers. A plurality of electrodes are positioned within the coating chambers so as to surround the filament. A near arc-over voltage is supplied to the electrodes and a fog of particulate coating material suspended in a gas is passed through the coating chambers and axially of the filament at a velocity which results in the electrostatic deposition of the particulate matter on the filament and the exhaust of the gas and excess particulate matter from between the coating chambers and the apex opening of the last coating chamber. The method of the invention includes the steps of passing a filament through a cloud of particulate coating material suspended in a gas, surrounding the filament with a plurality of spaced …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.