Method of rendering uniform coating on disks and product

A method of applying a coating of moderate-to-high viscosity to a disk substrate to yield very precise thickness uniformity, comprising the steps of:

• formulating a coating mixture;
• and
• applying this mixture in a prescribed stream to the disk surface so as to form one or several arcuate bead segments, extending circularly or spirally about the disk surface;
• the mixture being so formulated and so applied as to be capable of leveling and so rendering the desired coating;
• this mixture being dispensed through nozzle means, and being formulated to exhibit a prescribed viscosity apt for such dispensing, as well as to exhibit a prescribed thixotropy and wetting characteristic relative to said disk surface whereby the deposited bead segments will "set-up" thereon for sufficient time to allow the leveling action;
• this nozzle means being adapted and controlled to so dispense the mixture at a prescribed delivery rate, wherein the nozzle means is mounted on arm means adapted and controlled to be translated radially of said disk, the disk being optionally rotated at from zero to a prescribed rpm adapted to compensate for asymmetric bead leveling.

A method of applying a coating of moderate-to-high viscosity to a disk substrate to yield very precise thickness uniformity, comprising the steps of:

• formulating a coating mixture;
• and
• applying this mixture to the disk surface so as to form one or several bead segments, extending about the disk surface;
• the mixture being so formulated and so applied as to be capable of leveling and so rendering the desired coating.