Process and apparatus for internally coating a tubing
US4397891A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 1982 |
| Grant date | Aug 9, 1983 |
| Priority date | — |
| Expiry date | Mar 30, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05D2201/00
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A process and apparatus for coating the interior of a fiber-reinforced tube formed of cellulose hydrate in which a tube filled with a coating liquid is passed through a special conveying and pumping device which also serves to replenish the coating liquid. Above the level of the coating liquid, the tube is inflated with a support gas and is gradually flattened. The flattened tube then travels through a metering device made up of wipers in the form of doctor blades or rollers, which retain the major quantity of the coating liquid which is present on the inside surface of the tubing so that a thin, uniform film of the coating liquid is formed. The tubing is thereafter dried to remove the volatile constituents of the coating liquid, and is subsequently wound up.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.