Process for producing a magnetic recording medium having an impr

Details Process for producing a magnetic recording medium having an impr Process for producing a magnetic recording medium having an impr

1984-01-11

1987-04-28

Pianalto, Bernard D.

Coating processes

Magnetic base or coating

Magnetic coating

427290, 427293, 427379, H01F 1002

Patent

active

046613773

ABSTRACT:
A heat-treating process is disclosed. The process involves cutting a polymer support for a recording medium from a web roll of a long support base into a sheet form. The sheet or sheets in a superposed state are then heat-treated while applying pressure in the range of 1 g/cm.sup.2 to 1 kg/cm.sup.2 at a temperature of 50.degree. C. to 150.degree. C. for a period of time of 15 seconds to 24 hours. The heat treating process avoids conventional problems with respect to thermal shrinkage.

REFERENCES:
patent: 3473960 (1969-10-01), Jacobson et al.
patent: 3676216 (1972-07-01), Abitboul
patent: 4100326 (1978-07-01), Somezawa et al.

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