Coating apparatus
US4357899A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 27, 1981 |
| Grant date | Nov 9, 1982 |
| Priority date | — |
| Expiry date | Nov 27, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2001/7444
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A wide moving web is coated on one side thereof by passing the web through an elongated pool of non-Newtonian coating liquid. The pool is contained at its opposite ends by walls or dams, these dams being spaced a distance less than the width of the web, such that the side edges of the web are not coated. The dams are constructed and arranged such that the coating liquid approaches the adjacent web edge in an amount which increases as the depth of the pool of coating liquid increases. Monitoring means view the opposite side edges of the coated web. When the coating begins to retreat toward the center of the web, pool replenishment is increased. When the coating begins to approach the edges of the web, pool replenishment is decreased. The sensor whose coating is closest to the web edge is in control of the pump. If the coating reaches an edge of the web, the coating apparatus is stopped.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.