Method of a making magnetic recording medium

Details Method of a making magnetic recording medium Method of a making magnetic recording medium

1988-05-10

1989-07-11

Pianalto, Bernard

Coating processes

Measuring, testing, or indicating

427 39, 427128, 427129, 427130, 427132, 427172, 427177, 427251, 4272552, 427295, 427296, 427322, 4273982, B05D 306, B05D 312

Patent

active

048471097

ABSTRACT:
A method of and an apparatus for making a magnetic recording tape, which is free from wrinkles formed thereon, by the use of a vapor deposition technique. A length of tape reeled on a supply reel is taken up by a take-up reel after having passed through a deposition station where it is movably turned around a cylindrical drum. In one aspect, the difference in tension between two different portions of the tape moving between the drum and the take-up reel and on respective sides of a tensioning roll forming a part of at least one tension control mechanism is adjusted to a value not greater than 10N/mm.sup.2. In another aspect, a charge eraser is employed and installed in the vicinity of the drum for removing an electrostatic charge built up in the tape being moved from the drum onto the take-up reel. In a further aspect, the cylindrical drum is used having its outer peripheral surface roughened to a ten-point average surface roughness of not smaller than 0.1 .mu.m.

REFERENCES:
patent: 4557944 (1985-12-01), Arai et al.

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