Coating processes – Magnetic base or coating
Patent
1988-08-08
1989-09-19
Pianalto, Bernard
Coating processes
Magnetic base or coating
118503, 427240, 4274071, 4272555, 4272556, 4272557, 428 64, 428695, 428900, B05D 512, B32B 302
Patent
active
048680095
ABSTRACT:
The invention is concerned with a method and apparatus for uniformly depositing a solid lubricant coating on a data storage disc. The method comprises passing the entire disc, in horizontal orientation with a first side thereof facing downwardly, through a vertically extending zone having a lubricant in vapor form streaming upwardly therein while maintaining the disc at a temperature such that the lubricant condenses on contact therewith and while controlling the time of residence of the disc in the zone such as to provide a desire thickness for the coating. The disc is rotated about its center as it passes through the zone at a rate selected to ensure uniformity of deposition of the lubricant on the first side of the disc. The orientation of the disc is reversed so that its second side faces downwardly. The entire disc is passed in horizontal orientation with the second side downward through a vertically extending zone having a lubricant in vapor form streaming upwardly therein while the disc is maintained at a temperature such that the lubricant condenses on contact therewith and while the time of residence of the disc in the zone is controlled such as to provide a desired thickness for the coating. The disc is rotated about its center as it passes through the zone at a rate selected to ensure uniformity of deposition of the lubricant on the second side of the disc. The resultant product is a very uniformly coated disc and this is accomplished without the use of a solvent for the lubricant.
REFERENCES:
patent: 3640767 (1972-02-01), Fulton et al.
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