JPH08102058A - Producing device for magnetic recording medium - Google Patents

Abstract

PURPOSE: To improve the workability by providing the producting device with a cotrolling means to independently control the injection of a lubricant soln. from each of plural nozzles and with an ultrasonic device to apply ultrasonic vibration when the lubricant soln. is injected from the nozzles. CONSTITUTION: A supporting body 1 having a metal magnetic film and a back coating film is stretched between a supply roll and a take-up roll 2b. A vacuum chamber 11 is evacuated to about 5Torr to 10<-2> Torr vacuum degree. Then switches of a bubble jet liquid supplying device 6 and an ultrasonic device 7 are turned on to spray atomized lubricant particles through nozzles 5a, 5b, 5c,... to the metal magnetic film on the traveling supporting body 1. Then the metal magnetic film with the atomized lubricant fine particles deposited is smoothed by a smoother 9, dried by an IR lamp 10 and wound up on the take-up roll 2b. By this method, although vaporization of the lubricant is difficult, the lubricant film can be uniformly and efficiently formed.

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 For magnetic recording media such as magnetic tape, 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 because of the demand for high density recording. 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 this type of magnetic recording medium has a high packing density of magnetic material, it is suitable for high-density recording.

An apparatus for producing a magnetic recording medium by such dry plating means is generally constructed as shown in FIG. In FIG. 3, 31 is a cooling can roll,
32a is a supply side roll of the polyethylene terephthalate (PET) film 33, 32b is a winding side roll of the PET film 33, 34 is a shielding plate, 35 is a crucible, 36 is a magnetic metal, and 37 is a vacuum chamber. Then, after the vacuum chamber 37 is evacuated to a predetermined vacuum degree, the electron gun 38 is operated to evaporate the magnetic metal 36 in the crucible 35 and deposit evaporation particles of the magnetic metal 36 on the PET film 33. A magnetic recording medium is manufactured by (vapor deposition).

Incidentally, even in the metal thin film type magnetic recording medium obtained by such an apparatus, a lubricant is applied to the surface from the viewpoint of running property. In the past, the take-up roll 32b was taken out from the vacuum chamber 37, and the same means as the coating means used for coating the magnetic coating material of the coating type magnetic recording medium, for example, die coating or The lubricant is applied by means of gravure coating.

[0005]

DISCLOSURE OF THE INVENTION However, in the above-described lubricant applying means, the magnetic layer is formed in the vacuum chamber, while the lubricant is applied in the atmosphere. Increasingly it has become apparent that it is complex, cumbersome and expensive. As a result of earnestly studying such problems, if the lubricant is also applied in the vacuum chamber, the lubricant can be continuously applied following the formation of the magnetic layer. As a result, we have reached the revelation that the manufacturing process can be simplified and the cost can be reduced.

The present invention has been achieved from such a viewpoint, and an object of the present invention is to provide a magnetic recording medium manufacturing apparatus capable of simplifying the manufacturing process and reducing the cost. An object of the present invention is an apparatus for manufacturing a magnetic recording medium having a lubricant layer on a magnetic layer, wherein a tank for storing the lubricant for applying the lubricant on the magnetic layer and a vacuum chamber Are provided between the tank and the plurality of nozzles for discharging the lubricant solution to the magnetic layer running in the above, and the discharge of the lubricant solution from each of the plurality of nozzles is independently controlled. The present invention is achieved by an apparatus for manufacturing a magnetic recording medium, comprising: a control unit and an ultrasonic device that applies ultrasonic vibration when discharging the lubricant solution from the nozzle.

In particular, an apparatus for manufacturing a magnetic recording medium in which a metal thin film type magnetic layer is provided on a support and a lubricant layer is provided on the magnetic layer, and the support runs in a vacuum chamber. A metal thin film forming means for providing a metal thin film type magnetic layer thereon, a tank for storing a lubricant for applying a lubricant on the magnetic layer, and a lubricant solution for the magnetic layer running in the vacuum chamber. A plurality of nozzles for ejecting, a control means provided between the tank and the plurality of nozzles, for independently controlling the ejection of the lubricant solution from each of the plurality of nozzles, and the lubricant solution from the nozzles. And an ultrasonic device that applies ultrasonic vibration during ejection of the magnetic recording medium.

The control means is, for example, Japanese Patent Laid-Open No. 54-54.
A bubble jet type (inkjet type) device described in Japanese Patent Publication No. 59936 can be used. Therefore, an object of the present invention is an apparatus for manufacturing a magnetic recording medium having a lubricant layer on a magnetic layer, the tank containing a lubricant for applying a lubricant on the magnetic layer,
A plurality of nozzles for ejecting the lubricant solution to the magnetic layer running in the vacuum chamber and a nozzle provided between the tank and the plurality of nozzles, and the ejection of the lubricant solution from each of the plurality of nozzles is independent. And a supersonic device for applying ultrasonic vibration when the lubricant solution is ejected from the nozzle, which is achieved by a device for manufacturing a magnetic recording medium. In particular, it is an apparatus for manufacturing a magnetic recording medium in which a metal thin film type magnetic layer is provided on a support and a lubricant layer is provided on the magnetic layer, and a metal is provided on the support running in a vacuum chamber. A metal thin film forming means for providing a thin film type magnetic layer, a tank for storing a lubricant for applying a lubricant on the magnetic layer, and a lubricant solution are discharged to the magnetic layer running in a vacuum chamber. A plurality of nozzles, a bubble jet type control means which is provided between the tank and the plurality of nozzles, and independently controls the discharge of the lubricant solution from each of the plurality of nozzles,
And an ultrasonic device that applies ultrasonic vibration when the lubricant solution is discharged from the nozzle.

When a magnetic recording medium is manufactured using this apparatus, especially when a bubble jet apparatus and an ultrasonic apparatus are used together when a lubricant film is provided, the film thickness of the lubricant can be accurately and accurately obtained. It was possible to provide a uniform, even, and efficient lubricant. still,
An ultrasonic device is used for discharging the lubricant solution from a plurality of nozzles, and ultrasonic spraying is performed to efficiently apply a film of the lubricant. However, when a plurality of nozzles are only connected to the same lubricant tank, the vaporization conditions and the like vary depending on the nozzle orientation, which causes a difference in the amount of lubricant solution discharged from each nozzle. It happened that the applied lubricant had some unevenness.

However, if the bubble jet device is used for ultrasonic atomization and the amount of lubricant supplied to each nozzle is independently controlled, the amount of lubricant discharged from each nozzle always satisfies a desired relationship. Was done,
For example, the amount of lubricant discharged from all nozzles is the same, or the amount of lubricant discharged from the nozzle located on the center side is always more constant than the amount of lubricant discharged from the nozzle located at the end. The control that the amount is reduced is surely performed. Then, here, in order to efficiently attach the film of the lubricant, even if ultrasonic spraying is performed, the amount of the lubricant supplied to each nozzle is always controlled so as to satisfy a desired relationship, The lubricant can be evenly and efficiently provided.

That is, by providing both the control means such as the bubble jet system and the ultrasonic spraying device, a unique effect is exhibited for the first time. Further, when a control means such as a bubble jet method is used, even a high concentration of lubricant such as 5% can be used, the amount of solvent used can be reduced, and further, the lubricant can be applied to unnecessary portions. Since there is no need to apply even more, the lubricant is applied only to the necessary parts, so the waste of the lubricant is also eliminated, compared with the case of the conventional method such as die coating or gravure coating in the atmosphere, The amount of lubricant and solvent required was only a few hundredth, and the lubricant film could be formed extremely economically.

In the present invention, the lubricant used is
For example, a perfluoropoie having a molecular weight of 2000 to 5000
Liethers, such as-(C (R) F-CF₂-O)_p-(However, R is
F, CF ₃, CH₃Such as), especially HOOC-CF₂(O-C₂F_Four)
_p(OCF₂)_q -OCF₂-COOH, F- (CF₂CF₂CF₂O)_n-CF₂CF₂COO
Carboxyl group-modified perfluoropolyol such as H
Ether, HOCH₂-CF₂(O-C₂F_Four)_p(OCF₂)_q -OCF₂-CH₂O
H, HO- (C₂H_Four-O)_m-CH₂-(O-C₂F_Four)_p(OCF₂)_q -OCH₂-(O
CH₂CH₂)_n-OH, F- (CF₂CF₂CF₂O)_n-CF₂CF₂CH₂With OH
Such as alcohol-modified perfluoropolyether
No. Specifically, the Fomb of Montecatini
There are phosphorus Z DIAC and Z DOL. And the solvent
As long as it dissolves the lubricant,
Perfluoropolyether (Gall of Montecatini
Den SV110 etc. are used.

A specific example will be described below.

[0014]

1 and 2 show an embodiment of an apparatus for manufacturing a magnetic recording medium according to the present invention. FIG. 1 is a schematic view of a main part (lubricant applying device), and FIG. 2 is an applying head part. FIG. For forming a metal thin film type magnetic layer (metal magnetic film) in a magnetic recording medium, any apparatus such as a dry plating apparatus such as a vapor deposition apparatus or a sputtering apparatus or a wet plating apparatus such as an electroless plating apparatus is used. It may be used. For example, an oblique vapor deposition device as shown in FIG. 3 can be used.

The film forming apparatus for such a metal magnetic film may be integrated with a lubricant applying apparatus described later, or may be a separate type. In this embodiment, a separate type will be described. In each figure, 1 is a support provided with a metal magnetic film. The support 1 is made of polyester such as PET, polyamide, polyimide,
Olefinic resins such as polysulfone, polycarbonate and polypropylene, cellulose resins, polymer materials such as vinyl chloride resins, inorganic materials such as glass and ceramics, and metal materials such as aluminum alloys are used. An undercoat layer for improving the adhesion of the magnetic layer (magnetic thin film) is provided on the surface of the support 1 as needed. That is, by appropriately roughening the surface roughness, for example, the adhesion of the magnetic thin film formed by the oblique vapor deposition method is improved, and the surface roughness of the magnetic recording medium surface is moderated to improve the running property. Therefore, for example, the thickness containing particles such as SiO ₂ is 0.005 to 0.
The undercoat layer is formed by providing a coating film of 1 μm.

A metal magnetic film is provided on one surface of the support 1 by an oblique vapor deposition apparatus. In addition to the metals such as Fe, Co, and Ni, Co-Ni alloys, Co-Pt alloys, Co
-Ni-Pt alloy, Fe-Co alloy, Fe-Ni alloy,
Fe-Co-Ni alloy, Fe-Co-B alloy, Co-N
Examples thereof include i-Fe-B alloy, Co-Cr alloy, and alloys containing a metal such as Al.

On the other surface side of the support 1, a so-called back coat film is provided by coating a back coat paint containing, for example, carbon black and a binder resin. Reference numeral 2a is a supply side roll of the support 1 provided with a metal magnetic film and a back coat film, 2b is a winding side roll, and 3 is a heating can roll. Then, the support 1 is unrolled from the supply-side roll 2a, attached to the heating can roll 3, and then wound up by the winding-side roll 2b.

Reference numeral 4 is a coating head. This coating head 4
Is a plurality of nozzles 5a, 5b, 5 as shown in FIG.
c, ... Further, it is provided with a bubble jet type liquid feeder (a bubble jet type control means for independently controlling ejection) 6, and an ultrasonic device 7 composed of an ultrasonic vibrator and a horn. Therefore, from the nozzle 5a of the coating head 4, regardless of the other nozzles 5b, 5c, ..., A predetermined amount of lubricant solution (for example, Fomblin Z DOL was dissolved in Galden SV110 at 0.5%). (Lubricant solution) is dispensed, a predetermined amount of lubricant solution is dispensed from the nozzle 5b regardless of the other nozzles 5a, 5c, ... 5
Regardless of a, 5b, ..., A predetermined amount of lubricant solution is dispensed. That is, the bubble jet type liquid feeder 6 always sends a predetermined amount of the lubricant solution independently to each of the nozzles 5a, 5b, 5c ,.
A fixed amount of the lubricant solution is discharged from 5c, .... At the time of this discharge, the ultrasonic vibration from the ultrasonic device 7 acts on the nozzles 5a, 5b, 5c, ... And the lubricant solution existing in the nozzles 5a, 5b, 5c ,. As a function, the lubricant solution is released (sprayed) in the form of fine particles. Since the nozzles 5a, 5b, 5c, ... Of the coating head 4 face the metallic magnetic film of the support 1 running along the heating can roll 3, the fine particles of the lubricant solution are efficiently And, it becomes to be sprayed uniformly.

The bubble jet type liquid sending device 6 heats the liquid sending passages corresponding to the nozzles 5a, 5b, 5c, ... With a heater and sends the liquid by the force of bubbles (bubbles) generated at this time. It is configured to deliver the lubricant solution from the liquid path. 8 is a tank for supplying the lubricant solution to the bubble jet type liquid feeder, 9 is a film smoother, and 10 is a film smoother.
Is an infrared lamp, and 11 is a vacuum chamber.

In the apparatus configured as described above, the support 1 provided with the metal magnetic film and the back coat film is suspended between the supply side roll and the winding side roll 2b, and the inside of the vacuum chamber 11 is suspended. The vacuum is evacuated to about 5 Torr to 10 ⁻² Torr, for example, 5 × 10 ⁻¹ Torr. And
The bubble jet type liquid feeder 6 and the ultrasonic device 7 are turned on, and atomized lubricant fine particles are sprayed from the nozzles 5a, 5b, 5c, ... To the metallic magnetic film on the running support 1. .

After that, the metal magnetic film having the atomized lubricant fine particles adhered thereto is smoothed by the smoother 9, dried by the infrared lamp 10, and then wound up by the winding side roll 2b. When done as above,
Although the lubricant was difficult to vaporize, the lubricant film was applied evenly and uniformly.

On the other hand, in the above apparatus, when the ultrasonic device 7 was switched off (Comparative Example 1), the amount of the lubricant solution sprayed was small, resulting in unevenness. And, the efficiency was not good either. or,
When a coating head of the type in which the bubble jet type liquid feeder 6 in the coating head 4 of FIG. 2 is removed is used instead of the coating head 4 (Comparative Example 2), the lubricant solution is sprayed by an ultrasonic spraying method. Therefore, although the spray efficiency is good, a difference occurs in the amount of lubricant solution sprayed from each nozzle,
The applied lubricant had some unevenness.

Then, the original fabrics obtained in the above-mentioned Examples and Comparative Examples 1 and 2 were slit into a width of 8 mm, loaded into an 8 mm VTR cassette, 1000 rolls each were prepared, their jitters were measured, and running stability was measured. The results are shown in Table-1. Table-1 Examples Comparative Example 1 Comparative Example 2 Average value of 10 lines from the jitter minimum value 52 53 52 52 Average value of the entire 1000 lines 55 60 57 Average value of 10 lines from the maximum jitter number 59 66 60 As can be seen, ultrasonic waves are used. It can be seen that when the lubricant is applied by spraying, the jitter is small and the distribution width is narrow. Further, according to the present invention in which the ultrasonic spray and the bubble jet are used together, the jitter is less likely to occur. That is, according to the present invention, it is possible to obtain a product with less variation and less jitter.

[0024]

According to the present invention, the lubricant is provided on the magnetic layer with good workability, the waste of the lubricant is extremely small, the cost is low, and the lubricant film is uniform.
The obtained magnetic recording medium has high performance.

[Brief description of drawings]

FIG. 1 is a schematic view of a main part (lubricant applying device) of a magnetic recording medium manufacturing apparatus according to the present invention.

FIG. 2 is a schematic view of a coating head unit.

FIG. 3 is a schematic explanatory diagram of a magnetic recording medium manufacturing apparatus.

[Explanation of symbols]

 1 Support 2a Supply side roll 2b Winding side roll 3 Heating can roll 4 Coating head 5a, 5b, 5c Nozzle 6 Bubble jet type liquid transmitter 7 Ultrasonic device 8 Tank 9 Film smoother 11 Vacuum tank

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

Claims (1)

[Claims] 1. An apparatus for producing a magnetic recording medium having a lubricant layer on a magnetic layer, the tank containing a lubricant for applying the lubricant on the magnetic layer, and a device running in a vacuum chamber. A plurality of nozzles for ejecting a lubricant solution to the magnetic layer, and a control means that is provided between the tank and the plurality of nozzles and independently controls the ejection of the lubricant solution from each of the plurality of nozzles. And an ultrasonic device that applies ultrasonic vibration when the lubricant solution is ejected from the nozzle.