Design for manufacturing magnetic recording medium

Details Design for manufacturing magnetic recording medium Design for manufacturing magnetic recording medium

1994-04-14

2000-09-26

Pianalto, Bernard

Coating processes

Direct application of electrical, magnetic, wave, or...

Pretreatment of substrate or post-treatment of coated substrate

427128, 427599, H01F 100

Patent

active

061240028

ABSTRACT:
A method to manufacture magnetic recording medium including the step of subjecting the unfinished magnetic recording medium to a random orientation device prior to a drying step, to thereby remove the magnetic anisotropy of the magnetic recording medium caused by the preferential orientation of ferromagnetic fine particles along the travelling direction of the unfinished magnetic recording during the application of a magnetic coating composition onto a non-magnetic support strip. The random orientation device includes a magnet, which is oriented parallel to the plane of the non-magnetic strip and generates a set of lines of magnetic field. Each set of lines of magnetic fields are associated with only one magnet and contain both forward and backward directional magnetic fields in a direction perpendicular to the travelling direction of the unfinished magnetic recording medium. More than one magnet can be used; however, each magnet generates a separate and independent set of such lines of magnetic field.

REFERENCES:
patent: 3413141 (1968-11-01), Friedman
patent: 3681138 (1972-08-01), Ankenbrand et al.
patent: 4271782 (1981-06-01), Bate et al.
patent: 4336278 (1982-06-01), Pertzsch
patent: 4518626 (1985-05-01), Kato et al.
patent: 4672913 (1987-06-01), Kato et al.

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