Coating processes – Magnetic base or coating – Magnetic coating
Patent
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.
Higuchi Shigetaka
Ishibashi Isao
Shimizu Tatsuo
Somezawa Masashi
Eslinger Lewis H.
Pianalto Bernard D.
Sinderbrand Alvin
Sony Corporation
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