JPH07320262A - Device for producing magnetic recording medium - Google Patents

Abstract

PURPOSE:To simplify a producing process, to reduce the cost and to obtain a high quality magnetic recording medium by disposing a vacuum vessel, a spongy roll and a lubricant feeding means around a lubricant applying means. CONSTITUTION:A 1st vacuum vessel A and a 2nd vacuum vessel B communicate with each other through a path and the vessel B and a 3rd vacuum vessel C communicate with each other through a path. A metallic magnetic film is first formed on a PET film 1 as a substrate by a diagonal vapor depositing means in the vessel A. A protective film of glassy carbon is formed on the magnetic film by CVD in the vessel B. The film 1 is then allowed to run into the vessel C under evacuation and brought into contact with a heating roll 2. A lubricant soln. is applied to the protective film on the film 1 with an applying device 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording medium manufacturing apparatus.

[0002]

BACKGROUND OF THE INVENTION In a magnetic recording medium such as a magnetic tape, due to a demand for high density recording, a binder resin is not used as a magnetic layer provided on a non-magnetic support, instead of a coating type using a binder resin. A metal thin film type that is not used has been proposed. That is, it is well known that a magnetic recording medium having a magnetic layer formed by a dry plating means such as vacuum deposition, sputtering or ion plating has been proposed. Since the magnetic recording medium of this type has a high packing density of magnetic material, it is suitable for high-density recording.

Incidentally, even in this kind of metal thin film type magnetic recording medium, a lubricant is applied to the surface from the viewpoint of running property. Then, until now, the same means as the coating means used for applying the magnetic coating material to the coating type magnetic recording medium, for example, die coating or gravure coating, has been adopted. Then, the lubricant is applied.

However, in the above lubricant applying means, the formation of the magnetic layer is performed in the vacuum chamber, while the application of the lubricant is performed in the atmosphere, so that the manufacturing process is complicated. However, it gradually became clear that it was complicated and costly. In addition, in the method of applying lubricant after taking it out into the atmosphere, moisture (moisture) in the atmosphere may adhere to the metal magnetic film before the lubricant is applied, which may cause deterioration of durability. is there. Furthermore, if water adheres to the metal magnetic film, it is difficult to evenly attach the lubricant,
Also, it has become clear that the glue is bad.

[0005]

DISCLOSURE OF THE INVENTION As a result of intensive investigations on the above problems, if the lubricant is applied in a vacuum chamber, the lubricant is applied continuously after the formation of the magnetic layer. Reminder that the manufacturing process can be simplified, the cost can be reduced, and the problems such as lower durability and lubricant adhesion and glue will be solved. I got it.

The present invention has been achieved from such a viewpoint, and an object of the present invention is to provide a high-quality magnetic recording medium which can simplify the manufacturing process, can reduce the cost. Is. An object of the present invention is a magnetic recording medium manufacturing apparatus having means for providing a metal thin film on a support in a vacuum atmosphere, and means for applying a lubricant on the metal thin film in a vacuum atmosphere, The lubricant applying means includes a vacuum tank, a sea surface roll body arranged in the vacuum tank, and a lubricant supply means for supplying a lubricant to the sea surface roll body. This is achieved by an apparatus for manufacturing a recording medium.

It is preferable that the sea surface roll body is further provided with a film thickness control roll. The support in the magnetic recording medium of the present invention is, for example, a non-magnetic support, and the support is polyester such as PET, polyamide, polyimide, polysulfone, polycarbonate,
An olefin resin such as polypropylene, a cellulose resin, a polymer material such as a vinyl chloride resin, or an inorganic material such as glass or ceramic is used.

A metal thin film type magnetic film is provided on one surface side of the support by dry plating means such as vapor deposition means and sputtering means. Examples of the material of the magnetic particles that form the metal magnetic film include metals such as Fe, Co, and Ni, as well as Co—Ni alloys, Co—Pt alloys, and Co—N.
i-Pt alloy, Fe-Co alloy, Fe-Ni alloy, Fe
-Co-Ni alloy, Fe-Co-B alloy, Co-Ni-
Fe-B alloy, Co-Cr alloy, or Al in these
Those containing a metal such as are used. Incidentally, it is preferable that an oxidizing gas or the like is supplied at the time of forming the metal magnetic film, and a protective layer made of an oxide film is formed on the surface layer of the metal magnetic film.

Further, a protective film such as a carbon film is provided on the metal magnetic film, if necessary. A back coat film is provided on the other surface side of the support by dry plating means such as vapor deposition means. Examples of the material of the metal particles forming the back coat film include Al, Zn, Sn, Ni, A
Metals such as g, Fe and Ti are used. Also, Cu-A
1-X (where X is one or more selected from the group consisting of Mn, Fe and Ni) based alloys, Al-Si based alloys, Ti alloys and the like are used. Incidentally, Cu-Al-X (where X is one selected from the group of Mn, Fe and Ni,
(Or two or more) -based alloy has a Cu content of 70-
90 at%, Al content 8 to 25 at%, Mn content 0 to 4 at%, Fe content 0 to 5 at%, Ni
The content is preferably 0 to 4 at%. Also, Al
The Al content in the -Si alloy is 15 to 70 at%,
The Si content is preferably 15 to 70 at%.
At the time of forming the back coat film, a reactive gas having a component such as an O element, an N element or a C element is supplied, and the metal thin film is partially transformed into an oxide, a nitride or a carbide.

After the metal thin film (magnetic film or back coat film) is provided on the support in a vacuum atmosphere and before the metal thin film is exposed to the atmosphere, a lubricant is applied to the metal thin film in a vacuum atmosphere. To be done. Examples of the lubricant used at this time include-(C (R) F-CF ₂ -O) _p- (however,
R is a group such as F, CF ₃ and CH ₃ ), especially HOOC-CF ₂ (OC
₂ F ₄ ) _p (OCF ₂ ) _q -OCF ₂ -COOH, F- (CF ₂ CF ₂ CF ₂ O) _n -CF ₂ CF ₂
Carboxyl group-modified perfluoropolyether such as COOH (molecular weight 2000-5000), HOCH ₂ -CF
₂ (OC ₂ F ₄ ) _p (OCF ₂ ) _q -OCF ₂ -CH ₂ OH, HO- (C ₂ H ₄ -O) _m -C
H _2- (OC ₂ F ₄ ) _p (OCF ₂ ) _q -OCH _2- (OCH ₂ CH ₂ ) _n -OH, F- (C
F ₂ CF ₂ CF ₂ O) _n -CF ₂ CF ₂ CH ₂ OH Alcohol-modified perfluoropolyether (molecular weight 2000-500
0) and the like. Specifically, Montecatini's FOMBLIN Z DIAC and FOMBLIN Z
Examples include DOL and Daikin Industries' Demnum SA.

The lubricant is diluted with a diluent to a desired concentration (for example, 0.01 to 10 wt%). As the diluent, for example, GALDEN manufactured by Ausimont or Galden manufactured by Montecatini can be used. The coating of the lubricant on the metal thin film in this vacuum atmosphere is performed by providing a sea surface roll body arranged in a vacuum tank and a lubricant supply means for supplying a lubricant to the sea surface roll body. The device is used. Then, the lubricant is applied so as to have a thickness of 10 to 50 Å.

A specific embodiment will be described below.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an overall schematic view showing an embodiment of a magnetic recording medium manufacturing apparatus according to the present invention. In each drawing, A is a first vacuum tank for forming a magnetic layer, B is a second vacuum tank for forming a glassy carbon protective film, and C is a third vacuum tank for applying a lubricant. The first vacuum tank A and the second vacuum tank B, and the second vacuum tank B and the third vacuum tank C are connected via a communication passage.

First, in the first vacuum chamber A, a metal magnetic film is provided on a support by oblique vapor deposition means. That is, after evacuating the inside of the first vacuum chamber A to a vacuum degree of about 10 ⁻⁴ to 10 ⁻⁶ Torr, Co—Ni (80-20 at%) magnetic metal is removed by resistance heating, high frequency heating, electron beam heating, or the like. Evaporate, 0.04-2μ on PET film
A metal magnetic film is formed by vapor deposition with a thickness of, for example, 1600Å.

Subsequently, in the second vacuum chamber B, C
A 100Å-thick protective film made of glassy carbon is provided on the metal magnetic film by the VD means. After this, that is, the metal magnetic film, the PET film 1 on which the protective film is provided travels in the third vacuum chamber C where the vacuum is exhausted to a degree of vacuum of about 1 to 10 ⁻⁴ Torr (travel speed). 30 m / m
in) and come into contact with the heating roll 2.

A lubricant solution is applied by a coating device 3 to the protective film on the PET film 1 attached to the heating roll 2. The coating device 3 includes a sea surface roll body 5 in which a sea surface body 4b is provided on the surface of a core metal 4a that is pressed against a heating roll 2 with a PET film 1 interposed therebetween, and a lubricant solution 6 in which the sea surface body 4b is immersed. A container 7 containing the lubricant solution 6 and a pump 8 for supplying the lubricant solution to the container 7. Further, a film thickness control roll 9 is provided for the sea surface roll body 5 in order to control the thickness to be applied.

In this embodiment, FOMBLIN Z DIAC manufactured by Montecatini is used as the lubricant.
Galden from Montecatini is used as the diluent and a diluted lubricant solution is used. And the lubricant is 10Å
It is applied to have a thickness. Reference numeral 10 denotes a heating lamp for drying, which is coated with the lubricant layer by the coating device 3 and then heated by the heating lamp 10 to a temperature of 100 ° C., for example. This enhances the binding property of the lubricant and promotes the drying.

After drying, the tape was wound on a winding-side roll 11 and slit into a width of 8 mm to obtain a magnetic tape for 8 mm VTR. The coefficient of friction of the magnetic tape obtained as described above was 0.20 when examined with a commercially available friction coefficient measuring device. Moreover, when the jitter was examined using a jitter meter manufactured by Minato Electronics, it was 50 μs.

FIG. 2 is a schematic view of a main part showing another embodiment of the magnetic recording medium manufacturing apparatus according to the present invention. In the above-mentioned embodiment, the sea surface member 4b on the surface of the sea surface roll member 5 is soaked in the lubricant solution 6, but the core metal 4a is formed in a cylindrical shape, and a large number thereof are formed on the surface thereof. Hole 4
If c is configured and the lubricant solution is supplied to the core metal 4a, the lubricant solution is supplied to the surface sea surface body 4b through the hole 4c.

Therefore, with such a structure, wasteful evaporation of the lubricant solution in a vacuum atmosphere is reduced. The coefficient of friction of the magnetic tape obtained by using the apparatus of FIG. 2 was 0.19 when examined by using a commercially available apparatus for measuring coefficient of friction. Further, when the jitter was examined using a jitter meter manufactured by Minato Electronics, it was 49 μs.

On the other hand, after the protective film is provided, the protective film is taken out into the atmosphere, and the lubricant solution is applied by the usual gravure coating, and the same 8 mmV as in the above embodiment is applied.
A magnetic tape for TR was obtained. The friction coefficient of this product was 0.35, and the jitter was 70 μs. Further, this product has a problem of uneven coating of the lubricant. However, the magnetic tape obtained by using the apparatus of the above embodiment has no such problem.

In the above embodiment, the case where the lubricant is applied to the metal magnetic film has been described. However, the apparatus of the present invention applies to the case where the lubricant is applied to the metal thin film type back coat film. Is also available. Further, although the continuous film formation is performed, after the magnetic layer (or the protective layer or the back coat layer) is formed, the film may be transferred to a vacuum chamber for forming the lubricating layer and formed.

[0023]

According to the present invention, a high-quality magnetic recording medium excellent in running characteristics and reproducing characteristics can be obtained easily and at low cost.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of a magnetic recording medium manufacturing apparatus according to the present invention.

FIG. 2 is a schematic view of a main part of another embodiment of the magnetic recording medium manufacturing apparatus according to the present invention.

[Explanation of symbols]

 A First vacuum tank for forming magnetic layer C Third vacuum tank to which lubricant is applied 1 PET film 2 Heating roll 3 Coating device 4a Core metal 4b Sea surface body 4c Hole 5 Sea surface roll body 6 Lubricant solution 7 Container 8 Pump 9 Film Thickness Control Roll 10 Heating Lamp

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shigemi Wakabayashi Inventor Shigemi Wakabayashi 2606 Akabane, Kaiga-cho, Haga-gun, Tochigi Kao Co., Ltd.Institute of Information Science (72) Inventor Akira Shiga 2606 Akabane, Kaiga-cho, Haga-gun, Tochigi Kao Company Information Science Laboratory

Claims (2)

[Claims] 1. An apparatus for manufacturing a magnetic recording medium, comprising: a means for providing a metal thin film on a support in a vacuum atmosphere; and a means for applying a lubricant on the metal thin film in a vacuum atmosphere. The agent coating means includes a vacuum tank, a sea surface roll body arranged in the vacuum tank, and a lubricant supply means for supplying a lubricant to the sea surface roll body. Manufacturing equipment. 2. The apparatus for manufacturing a magnetic recording medium according to claim 1, wherein a roll for film thickness control is provided on the sea surface roll body.