Claims
- 1. A method for manufacturing a magnetic recording medium, comprising the steps of coating a magnetic paint consisting mainly of a needle-like magnetic powder and a binder on a nonmagnetic support to form a coating film; establishing a DC magnetic field of a predetermined direction in a slot about which a superconductive solenoid coil is formed, said coil having substantially zero electrical resistance by being exposed to an extremely low temperature, passing said nonmagnetic support with the magnetic paint thereon while said needle-like magnetic powder is still mobile through said slot, said DC magnetic field having an intensity of 1.5 to 15 kOe and is applied for at least 100 msec, thereby orienting said needle-like magnetic powder in said predetermined direction; and drying said coating film.
- 2. A method according to claim 1 characterized in that said needle-like magnetic particles comprise an oxide-type ferromagnetic powder having a specific surface area of 10 to 30 m.sup.2 /g.
- 3. A method according to claim 2, characterized in that the intensity of the DC magnetic field is 3.5 to 8 kOe.
- 4. A method according to claim 1, characterized in that said needle-like magnetic particles comprise a ferromagnetic metal powder having a specific surface area of 30 to 120 m.sup.2 /g.
- 5. A method according to claim 4, characterized in that the intensity of the DC magnetic field is 5 to 10 kOe.
Priority Claims (1)
Number |
Date |
Country |
Kind |
56-81296 |
May 1981 |
JPX |
|
Parent Case Info
This is a continuation of application Ser. No. 464,496, filed Jan. 28, 1983, now abandoned.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
102e Date |
371c Date |
PCT/JP82/00209 |
5/28/1982 |
|
|
1/28/1983 |
1/28/1983 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO82/04343 |
12/9/1982 |
|
|
US Referenced Citations (3)
Continuations (1)
|
Number |
Date |
Country |
Parent |
464496 |
Jan 1983 |
|