Apparatus for providing a uniform coating on a continuous horizontally moving metal strip
US5029553A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 20, 1989 |
| Grant date | Jul 9, 1991 |
| Priority date | — |
| Expiry date | Mar 20, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B5/001
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An apparatus for providing a uniform application of a functional coating to one or both sides of a moving metal strip includes an enclosed cabinet in which a corona discharge field is established between high voltage electrodes and the strip. The coating liquid and air are separately supplied under pressure to atomizing nozzles within the enclosure. The nozzles create a dense flat spray that is directed into the discharge field at an acute angle relative to the strip. The particles in the spray become charged and are attracted to the grounded strip, while those that are not charged are directed onto the strip by the force of the discharge field. The rate at which the coating liquid is supplied to the nozzles is varied in accordance with the speed of the strip to thereby obtain a uniform coating regardless of variations in strip speed or width.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.