Process for continuously coating a metal wire at high velocity
US4070503A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Aug 15, 1975 |
| Grant date | Jan 24, 1978 |
| Priority date | — |
| Expiry date | Aug 15, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05C19/02
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A metal wire to be coated with thermoplastic material is advanced at high speed, e.g. of 100 meters per minute, through a codirectionally moving mass of thermoplastic particles after having been heated to a temperature high enough to cause adhesion of these particles to the wire. The mass is mechanically entrained in a treatment chamber by an endless belt or the like at a speed close enough to that of the wire to hold the velocity difference therebetween below a threshold value, such as 30 meters per minute, above which an abrasive effect sets in which tends to detach already adhering particles from the wire. Upon exiting from the treatment chamber, the wire is reheated to fuse these particles into a continuous envelope and is then subjected to an electrostatic flocking operation for studding the envelope with radially projecting cellulosic fibers forming a velvety coating thereon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.