High speed coating process for magnetic disks

Details High speed coating process for magnetic disks High speed coating process for magnetic disks

B - Operations, Transporting

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204/91

B01J 19/08 (2006.01) B05D 1/00 (2006.01) C08F 2/46 (2006.01) C08J 3/28 (2006.01) C08J 7/18 (2006.01) G11B 5/842 (2006.01)

Patent

CA 1243269

ABSTRACT A disk is rotated at high speed on a spindle while fluid magnetic media is applied to the disk through a dispensing nozzle which starts at the outside diameter of the disk and travels to the inside diameter, pauses momentarily, and then travels back to the outside diameter. As the media is applied, a thin film of media adheres to the disk while the excess media forms a protective coating over this thin film as it flows radially off of the disk due to the centrifugal force generated by the high speed of rotation. The nozzle discharge pressure and the high rotational speed of the disk result in a very thin film of magnetic media being applied to the disk. The rate of nozzle travel can be adjusted to vary the media film thickness. Immediately following the high speed coating application step the speed of the disk is substantially reduced and the disk is exposed to a magnetic orienting field during an orientation step. The speed of the disk is then increased again during a very short drying step.

451270

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