Method of manufacturing a magnetic recording medium

Details Method of manufacturing a magnetic recording medium Method of manufacturing a magnetic recording medium

1981-02-18

1982-06-01

Pianalto, Bernard D.

Coating processes

Electrical product produced

Integrated circuit, printed circuit, or circuit board

427128, B05D 314

Patent

active

043328342

ABSTRACT:
Improved orientation method is disclosed which is used in manufacturing magnetic recording medium.
The method comprises the steps of, applying magnetic paint composed mainly of acicular magnetic powder, binder and solvent on a non-magnetic substrate to form a magnetic coating layer, passing the magnetic coating layer through a magnetic field to apply an orientation magnetic field to align the magnetic powder along a predetermined direction while the coating layer is still wet and the powder is still movable in the paint, and drying the magnetic coating layer, wherein the magnetic coating layer is applied with the orientation magnetic field composed of a plurality of pulse magnetic field along one direction each is stronger than coercive force of the magnetic powder and subsequently applied with a D.C. magnetic field along the same direction and the same polarity as the last pulse magnetic field.

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