Coating device and coating method for highspeed coating with an organic solvent
US6312758A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 9, 1998 |
| Grant date | Nov 6, 2001 |
| Priority date | — |
| Expiry date | Apr 9, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/848
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Excellent coating device and method are disclosed which realize high-speed coating by improving the rigidity of a coating solution film and increasing the pressure of a coating solution film to a support so as not to be inferior to the wind pressure of an air film. In the coating method for extruding and applying an organic solvent contained in a paint used for a magnetic tape onto a continuously traveling support from a slit of an extrusion die, the slit spacing tl is set to not greater than 50 .mu.m and the gap t2 between the support and the extrusion die is set to 0.5 to 2 mm, while the extrusion speed of the organic solvent from the slit is set to not lower than 2.5 m/sec. A uniform film may be formed over a coating width only by the kinetic energy of the extruded solvent so as to enable realization of high coating film rigidity and coating solution pressure. Thus, high-speed coating onto the continuously traveling support may be carried out in a non-contact manner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.