JPS59157843A - Production of magnetic recording medium - Google Patents

Abstract

PURPOSE:To improve the durability, corrosion resistance and productivity in a long size of a magnetic recording medium on which a lubricating and protective film are uniformly and thinly formed by forming said film by a prescribed method on the surface of the thin magnetic alloy film on a base body. CONSTITUTION:A thin film layer 2 of a Co-Cr alloy is formed on a polyethylene terephthalate film 1. A lubricating and protecting film material 5 is supplied on a gravure mesh 3, and is uniformly coated on the mesh 3 by a squeegee 6. The material is then transferred onto a rubber type roll 8 and thereafter the material 5 is transferred and coated on the layer 2 and is dried. The resulted lubricating and protective film is uniform in a range of 150-200Angstrom over the length as long as 1,000m. The durability, corrosion resistance and productivity in a long size of the magnetic recording medium are thus improved.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a floppy disk (hereinafter referred to as F
Abbreviated as D. ) and a method for producing magnetic recording media such as tapes.

(Conventional structure and its problems) In recent years, the demand for magnetic chi 7°, FI) (l-i, video or audio equipment, and office automation equipment has increased significantly with the development of office automation equipment. Against this background, Research has begun on magnetic alloy vapor-deposited or sputtering tapes and FDs, which have the advantage of increasing recording density.

The magnetic layer obtained by this method is easily damaged by contact with the head and has poor durability. There was also a subtitle for the 100 million yen. In order to solve this problem, attempts have been made to form an organic thin film on the alloy thin film magnetic layer, but these methods mainly involve the rotating coating method or dip coating, and the thickness is not sufficiently uniform. It has disadvantages such as impairing playability and poor productivity.

(Object of the Invention) The object of the present invention is to provide a method for manufacturing a magnetic recording medium that eliminates the above-mentioned drawbacks and makes it possible to uniformly provide a 1000λ thickness of a retarding protective film material on an a-type alloy thin film. It is to be.

(Structure of the Invention) The method for producing a magnetic recording medium of the present invention is to provide a magnetic recording medium consisting of a base, a magnetic layer, and a lubricating protective film. It is provided by a process of applying a lubricating protective film paint to a mesh plate, a process of transferring the applied paint to a rubber plate, and a process of transfer-coating the paint transferred to the rubber plate onto the surface of the magnetic layer. O
It was possible to provide a uniform layer with a thickness equal to or less than OOA, and the number of repetitions (durability) of head contact recording and reproduction could be significantly improved without impairing the magnetic recording/reproducing characteristics. Furthermore, the corrosion resistance of the magnetic alloy thin film layer could also be improved.

(Description of Examples) FIG. 1 shows a cross-sectional view of a method of applying a lubricating protective film material to the surface of a magnetic alloy thin film in an example of the present invention.

In FIG. 1, ] is a polyethylene terephthalate (hereinafter abbreviated as PET) film with a diameter of 50 μyn J, 1i, and 2 is a post-recirculation film on which a normal malloy is applied to a thickness of 0.5 μm using the known square 1° tuttering method. , Co − within the chi
A magnetic alloy thin film layer for perpendicular magnetic recording provided with a Cr alloy to a thickness of 05 μm, 3 is a stainless steel gravure mesh plate,
The four parts have a diameter of 50 μm, a width of 50 μm in each direction, and a depth of 10 μm in the concave part. 4 is a rubber letterpress, 5 is a lubricating protective film material containing stearic acid and a solvent in epoxy fruit resin/resin, and 6 is a gravure plate with paint. It is a squeegee for attaching.

The operation of the non-embodiment lubricating protective film coating method configured as described above will be described below. In the figure (J).

(2), (3), and (4) indicate the order of operation; (2), (],), pour the lubricating protective film material 5 onto the gravure mesh plate 3, and (2), apply the gravure film using the Sugie-Gi 6. Added to Metsushi version 3. (3) Next, the rubber letterpress plate 4 is run on the gravure mesh plate 3 under pressure to transfer the lubricating protective film material 5 onto the rubber letterpress plate 4. (4) Next, when the rubber letterpress 4 is run on the magnetic alloy thin film layer 2 with pressure applied,
A lubricating protective film material 5 is applied onto the magnetic alloy thin film layer 2. Dry curing is then performed to provide a lubricating protective film on the magnetic alloy thin film layer.

The lubricant protective film thickness obtained by this method was uniform in the range of 100 to 150A. After punching this into a FD shape with a diameter of 51/4 inches, use a perpendicular magnetic recording head! When the ITII image was memorized and reproduced, it showed the same performance as without the lubricating protective film. Also, when we checked the repeatability by repeatedly playing back the same track on FDJe with the heads in contact, we achieved over OO million lotus/track. This was significantly higher than the 300,02 f/s/track without the lubricating protective film.

Further, when the lubricating protective film was applied by the Din0 method, thickness unevenness (200 to 1.500 λ thickness) occurred, causing irregularities in recording and reproducing characteristics.

In the above example, the gravure mesh plate 3 was made of stainless steel 1/s. When we made a magnetic recording medium using the same method, we obtained the same results.

FIG. 2 is a sectional view showing a method of applying a lubricating protective film material to the surface of a magnetic alloy thin film in another embodiment of the present invention.

In Figure 2, 1 is 15 μm thick PK'! 'film,
2 is a 0.1 μm thick Co-Ni magnetic alloy thin film layer obtained by vapor deposition, 3 is a stainless steel gravure plate;
0 μm 1 is 50 μm wide and the recess is 10 μm deep. 5 is a lubricating protective film material with the same composition as in the above example. 6 is a squeegee for uniformly applying the lubricating protective film material to the gravure plate recesses. 17 is a paint. The supply roll 8 is a rubber roll.

The operation of the lubricating protective film coating method of this embodiment configured as described above will be explained below.

A lubricating protective film material 5 is supplied to the gravure plate 3 by a paint supply roll 7, and excess paint is removed by a squeegee 6 for uniformly applying the lubricating protective film material 5. Next, after being transferred to a rubber roll 8, a slip protection film material 5 is transfer-coated onto the magnetic alloy thin film layer 2 and dried.

The lubricating protective film obtained by this method had a uniform length of 1000 m in the range of 50A to 200A, and there were no problems with the characteristics when this tape was evaluated as an audio tape.

(Effects of the Invention) As is clear from the above description, the present invention provides a magnetic recording medium consisting of a base, a magnetic layer, and a lubricating protective film, in which a lubricating protective film is provided on the surface of the magnetic layer using resin or stainless steel. A process of applying a lubricating protective film paint to a gravure mesh plate, a process of transferring the applied paint to a comb plate,
Since the coating is applied by transferring and coating the paint transferred onto a rubber plate onto the surface of the magnetic layer, an excellent effect is obtained in that the lubricating protective film can be uniformly applied to the N film. , the effects of improving the durability, corrosion resistance, and long-length productivity of magnetic recording media can be obtained without impairing the recording and reproducing characteristics.

[Brief explanation of drawings]

FIGS. 1 and 2 are cross-sectional views for explaining a method of applying a lubricating protective film material to the surface of a magnetic alloy thin film in an embodiment of the present invention. ]...-PET film, 2... Magnetic alloy thin film layer, 3 Gravure Metsu one edition, 4... Rubber letterpress, 5... nRf'f
t Protection film material, 6-Skino, 7・Paint supply roll, 8
・Rubber roll. Figure 1 Figure 2

Claims (1)

[Claims] In a magnetic recording medium consisting of a substrate, a magnetic layer, and a lubricating protective film, a lubricating protective film is applied to the magnetic and body layers, and a lubricating protective film is applied to the 1111M or stainless steel Tarabia Messy version. A process of transferring the two coated volumes onto a rubber plate, and a process of transferring and distributing the rubber ImK print onto the surface of the magnetic layer. Characteristic magnetic recording media style and manufacturing method.