Method and apparatus for coating a traveling paper web
US5824369A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1996 |
| Grant date | Oct 20, 1998 |
| Priority date | — |
| Expiry date | Jun 24, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05C11/04
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method and apparatus for coating a traveling paper web includes a coating applicator disposed in movably-controlled spaced adjacency with the paper web, which is supported on a rotating backing roll. The coating applicator permits a controlled introduction of a fresh portion of an aqueous slurry of coating material which is mixed with a recirculated portion of coating material in a controlled manner to prevent the formation of large vortices within the coating applicator. The coating material flows successively through mixing, convergent, and recirculation channels, all of which are defined on one side thereof by a distinct surface of a flow stabilizer which is positioned centrally in a cavity in the coating apparatus. Control of the supply of the coating material through the inlet nozzle, and the recirculation of the coating material between the recirculation and mixing channels, through a recirculation nozzle, is effected by directing the coating material through a plurality of orifices which provide a controlled back pressure in the coating material as well as to disrupt the propagation of cross-machine vortices in the coating material. The paper web is brought into contact wi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.