Method for treating a magnetic recording medium

Details Method for treating a magnetic recording medium Method for treating a magnetic recording medium

1975-07-11

1978-07-11

Pianalto, Bernard D.

Coating processes

Magnetic base or coating

Magnetic coating

427128, H01F 1002

Patent

active

041003268

ABSTRACT:
A method of preparing a magnetic recording medium, the surface of which has a very smooth magnetic layer. Magnetic paint is coated on a non-magnetic base, which is then passed between calender rolls which comprise a polyurethane roll and a steel roll heated between approximately 40.degree. C. and 200.degree. C. The hardness of the polyurethane roll is greater than approximately 70.degree. in Shore D, and the pressure between the rolls is between approximately 50 Kg/cm and 500 Kg/cm.

REFERENCES:
patent: 3216846 (1965-11-01), Hendrick et al.
patent: 3293066 (1966-12-01), Haines
patent: 3398011 (1968-08-01), Neirotti et al.

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