Method for coating the inner surface of metal pipes
US3974306A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 4, 1973 |
| Grant date | Aug 10, 1976 |
| Priority date | — |
| Expiry date | Oct 4, 1993 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S118/10
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method for coating the inner surface of a metal pipe having an inner diameter of about 1 to 15 cm, which comprises feeding from one end of said metal pipe dry particles of a coating composition into the interior of the metal pipe preheated at a temperature of from a softening point of said coating composition to below a melting point thereof, sucking air at the same time from the other end of the metal pipe so as to form an air stream carrying the particles and flowing in the interior of the pipe at a flow rate of about 4 to 20 m/sec and to allow the particles to deposit on the inner surface of the pipe, and fusing the deposited particles at a reduced pressure of 10 to about 100 mm Hg to form a continuous film on the inner surface of the pipe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.