PURPOSE: To prevent dust dislodgement and roughening of a calender roll surface by providing a polishing stage and dust removing stage between a stage for coating and drying a ferromagnetic material and stage for making a calender treatment.
CONSTITUTION: A belt-like substrate 1 is delivered by a supply roll 2 and is coated with the ferromagnetic material 4 in a coating part 3 to form a recording layer thereon. The substrate is then dried in a drying part 8 and the substrate 1 formed as a magnetic tape 9 is fed to a polishing part 10. The tape 9 is pressed to a polishing roll 11 by guide rolls 12 in the polishing part 10. The surface of the tape 9 is polished by the high-speed rotation of the roll 11. The tape 9 after the polishing is fed to a dust removing part 13 where the treatment powder, etc., sticking to the surface are removed. The tape 9 after the dust removal is fed to a calender part 14 where the tape 9 passes the space between rolls 15 and 16 under heating and pressurizing and is thereby calendered. The calendered tape 9 is taken up on a take up roll 17.
UTSUI MASAAKI
NOJIRI YASUTAMI
| JPS58121130A | 1983-07-19 | |||
| JPS54111308A | 1979-08-31 |