JPH06106883A - Magnetic recording medium and manufacture thereof - Google Patents

Abstract

PURPOSE:To easily forth permanent magnetic pattern on a magnetic recording medium and provide a magnetic recording medium wherein discrimination between the magnetic pattern and dummy pattern is difficult. CONSTITUTION:A base material 12 is coated with a coating containing magnetic powder and oriented magnetically toward a fixed direction so as to form a magnetic layer 14. On the magnetic layer 14, print patterns 16 are formed by ink containing a solvent which dissolves the magnetic layer 14 before it is cured. The magnetic layer 14 in contact with the print patterns 16 is dissolved by the solvent in the print patterns 16 and the magnetic orientation at these parts are made to be random. After the magnetic layer 14 is cured, a dummy pattern 18 is formed by the same ink as the print pattern 16. Permanent magnetic patterns corresponding to the print patterns 16 are formed, so that discrimination between the print patterns 16 and the dummy pattern 18 is difficult.

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 and a manufacturing method thereof, and more particularly to a magnetic recording medium having a permanent magnetic pattern and a manufacturing method thereof.

[0002]

2. Description of the Related Art In magnetic recording media such as magnetic cards,
It is known that a permanent magnetic pattern is formed to identify the magnetic card or the like. Conventionally, as a method of forming such a permanent magnetic recording pattern, a method of forming a magnetic pattern such as MICR characters or a magnetic bar code by printing, opening a punch hole in a magnetic layer, a laser of a magnetic layer, a needle, etc. There has been a method of forming a magnetic pattern by destruction due to.

[0003]

However, in the case of the former method, it is necessary to form a non-magnetic dummy pattern in order to prevent visual identification of the pattern, and this dummy pattern is the same as the magnetic pattern. If not, there is a problem that the magnetic pattern can be easily discriminated.

In the latter case, the pattern is formed by destroying the magnetic layer, so that the magnetic pattern can be easily discriminated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a magnetic recording medium which solves the above-mentioned problems of the conventional magnetic pattern and makes it more difficult to distinguish it from a dummy pattern in appearance and a manufacturing method thereof. .

[0006]

According to the present invention, a magnetic recording medium has a base material, a magnetic layer formed on the base material and magnetically oriented in a certain direction, and a magnetic layer dissolved on the magnetic layer. The magnetic layer has a print pattern formed of a possible ink, and the magnetic layer is magnetically oriented in a certain direction except for the portion in contact with the print pattern in which the magnetic orientation is disturbed.

Further, according to the present invention, a method of manufacturing a magnetic recording medium having a permanent magnetic pattern is applied by coating a base material with a magnetic coating material containing magnetic powder, magnetically orienting it in a certain direction, and then drying. To form a magnetic layer on the magnetic layer and form a predetermined print pattern with ink containing a solvent that can dissolve the magnetic layer and cannot dissolve after curing the magnetic layer, and dissolve the magnetic layer corresponding to the print pattern. To randomize the magnetic orientation and to harden the magnetic layer.

[0008]

Embodiments of the magnetic recording medium and the manufacturing method thereof according to the present invention will be described in detail with reference to the accompanying drawings.

An embodiment of the magnetic recording medium according to the present invention is shown in FIG. As shown in the figure, in the magnetic recording medium, the magnetic layer 14 is formed on the base material 12, and the print pattern 16 is formed on the magnetic layer 14. The magnetic layer 14 is magnetically oriented in a fixed direction, in the present embodiment, in the longitudinal direction of the substrate 12, except for the portion in contact with the print pattern 16.
The portion of the magnetic layer 14 in contact with the print pattern 16 is dissolved by the solvent contained in the ink of the print pattern 16,
The magnetization direction is random, and there is no magnetic orientation in a fixed direction.

A dummy pattern 1 is formed on the magnetic layer 14.
8 is formed. The dummy pattern 18 is formed of the same ink as the print pattern 16 after the magnetic layer 14 is dissolved by the print pattern 16 and then the magnetic layer 14 is cured. A concealing layer 20 and a protective layer 22 are laminated on the printed pattern 16 and the dummy pattern 18.

As described above, in the magnetic recording medium, the permanent magnetic pattern is formed on the magnetic layer 14 corresponding to the print pattern 16.

Next, a method of manufacturing such a magnetic recording medium will be described.

First, as shown in FIG. 2A, a magnetic layer 14 is formed by applying a magnetic coating material containing magnetic powder and a binder onto a base material 12 such as PET film. As shown, magnetic orientation is carried out in a fixed direction A. As the magnetic paint, a two-pack type containing a curing agent is usually used. When the magnetic layer is cured, it has solvent resistance that does not dissolve in the ink containing a high-boiling point solvent described below.

Next, as shown in FIG. 2B, a desired pattern is printed by using a silk screen type non-magnetic ink containing, for example, a high boiling point solvent to form a print pattern 16. When the print pattern 16 is formed, the magnetic layer 14 is in a state where it is not yet hardened. Print pattern 1
After the printing of No. 6, as shown in FIG. 2C, the shaded portion of the magnetic layer 14 in contact with the print pattern 16 is dissolved by the solvent contained in the ink of the print pattern 16 and the orientation of the magnetic powder is disturbed. The printing pattern 16 is fixed by drying it.

Thereafter, the magnetic layer 14 is hardened by sufficiently aging it. After the curing, the magnetic layer 14 'is not dissolved by the solvent of the ink, so that the dummy pattern 18 is printed using the same or another ink as shown in FIG. Depending on the printing of the dummy pattern 18, the magnetic layer 1
4'does not dissolve.

A magnetic recording medium is manufactured by further providing a concealing layer 20 and a protective layer 22 as required.

According to such a magnetic recording medium, in the magnetic layer 14, the portion of the print pattern 16 dissolved by the ink is disturbed in orientation, and the other portion is magnetically oriented in a fixed direction. Since these orientation patterns do not change due to subsequent printing or the like, they can be used as permanent magnetic patterns. When the magnetic recording medium as shown in FIG. 3 is magnetized by a predetermined magnetic field (the rightward magnetization is plus), only the portion where the magnetic orientation is disturbed corresponding to the print pattern 16 is magnetized as shown in FIG. Is reduced. Therefore, the magnetic pattern can be identified by detecting such a degree of magnetization using a magnetic detecting means.

According to the magnetic recording medium manufactured by the above method, the print pattern 16 corresponding to the magnetic pattern is formed.
Since the dummy pattern 18 and the dummy pattern 18 are formed of the same ink, it is difficult to visually distinguish between the magnetic pattern and the dummy pattern, so that the illegal use can be effectively prevented.

Although the magnetic layer 14 is oriented in the direction parallel to the surface of the substrate 12 in the above embodiment, it may be oriented perpendicularly. Further, as the ink forming the print pattern 16, a magnetic ink having a coercive force different from that of the magnetic layer 14 may be used. Alternatively, instead of ink, a solvent capable of dissolving the magnetic layer before curing may be applied according to the magnetic pattern to be formed and dried. When the magnetic pattern is formed by using the solvent as described above, it is more difficult to visually distinguish the magnetic pattern as compared with the printed pattern.

Further, when the printing pattern 16 is formed by using a magnetic ink having a coercive force different from that of the magnetic layer 14,
Complex magnetic data can be given by the pattern.

The case where the method of manufacturing a magnetic recording medium according to the present invention is applied to the manufacture of a magnetic card will be described in detail with reference to more specific examples.

First, as the base material 12, for example, a thickness 188 is used.
White PET film of μm, E-22 manufactured by Toray Industries, Inc.
Prepare E-24 and the like. As the base material 12, a material used as a base material in an ordinary card, for example, high-quality paper, hard polyvinyl chloride, plastic such as polyester can be used.

Next, a magnetic paint is coated to form the magnetic layer 14. As the magnetic ink, for example, one having the following composition can be used. Magnetic powder Toda Kogyo MC-127 100 parts Dispersant Toho Kagaku trade name Phosphanol RE-960 3 parts Binder Union Carband VAGH 12.5 parts Nippon Polyurethane N-2304 35.7 parts (NV35% MEK solution) Antistatic agent Cabot Co. product name VULCAN XC72 3 parts Solvent cyclohexanone 67 parts Toluene 33 parts Methyl ethyl ketone 10 parts

The above composition is made into an ink in advance, and the following curing agent is added immediately before coating. Hardening agent Nippon Polyurethane Co., Ltd. N-3041 8 parts (NV50%)

As a coating method, a reverse roll method is used in this embodiment, but other commonly used coating methods such as a gravure method and a wire bar method can be used.

During coating, the magnetic field is oriented in the film flow direction. As the orientation magnetic field, a horizontal magnetic field of 3000 oersted by a permanent magnet is used in this embodiment.
Further, the orientation direction may be any direction such as vertical direction or diagonal direction, but is preferably horizontal direction (longitudinal direction of card) or vertical direction.

The coating was carried out at a speed of 20 m / min, and after coating, it was dried at 100 ° C. for 2 minutes. The obtained coating film has a dry film thickness of 12 μm and a residual magnetic flux of 1.6 Mx /
cm, the squareness ratio was 0.89, and the coercive force was 2750 oersteds.

After coating, the sheet is cut within one day without aging. This length is arbitrary. In this case, the coating film is not yet sufficiently cured, and the heat resistance and solvent resistance are poor. When the sheet is cut, magnetic poles are generated in the longitudinal section of the sheet as shown in FIG. In the case of the figure, the N pole is generated at the right end and the S pole is generated at the left end, but it may be generated in the opposite direction depending on the orientation of the orientation magnetic field.

Next, as shown in FIG. 2 (b), a magnetic layer 1 is formed by using a silk screen printing ink containing a high boiling point solvent.
Pattern printing is performed before 4 is cured, and printing pattern 1
6 is formed. The following composition can be used as the ink for silk screen printing. Pigment Benji (red) 64 parts Thickener Bentonite 8 parts Dispersant Toho Chemical Co., Ltd. trade name Phosphanol RE-960 3 parts Binder Union Carbide trade name VAGH 25 parts Solvento # 100 22 parts Cyclohexanone 22 parts Butyl cellosolve 11 Department

An ink having the above composition was used with a screen mesh (Tetron # 305) to have a thickness of 1 mm and a length of 4 m.
A printing pattern 16 composed of a bar having a thickness of m and a thickness of 5 μm is printed.

Then, after drying at room temperature for 5 minutes, it is dried in an oven at 60 ° C. for 10 minutes.

When the printing pattern 16 is formed with the above-mentioned silk screen printing ink, the magnetic layer 1 in the portion corresponding to the printing pattern 16 (the portion in contact with the printing pattern 16) is formed.
4 is dissolved by the solvent in the printing ink. Therefore, as shown in FIG. 6, the orientation of the magnetic powder in this portion is disturbed, and the magnetization direction becomes random. In the portion that does not correspond to the print pattern 16, the magnetization directions are aligned in the longitudinal direction. Such a difference in the direction of the magnetization is detected by the detecting means as a difference in the saturation magnetization value as shown in FIG. 4 described above, so that the magnetic pattern can be identified.

Then, the magnetic layer 14 is hardened by aging. Aging is performed at 60 ° C. for 100 hours or more. As a result, the oriented portion and the disordered portion are cured and fixed, respectively. After curing, in the case of the above silk screen printing ink, the magnetic layer 1 is dried at room temperature.
4'is not dissolved.

Further, a dummy pattern 18 is printed at a position different from the print pattern 16 already formed by the silk screen printing ink. At this time, since the magnetic layer 14 ′ under the newly printed dummy pattern 18 is not dissolved by the solvent contained in the dummy pattern 18, the magnetic orientation of this portion is not disturbed.

After that, printing is performed with silver ink to form a concealing layer 20 for concealing the surfaces of the magnetic layer 14 ', the print pattern 16 and the dummy pattern 18. The silver ink having the following composition can be used. Aluminum powder Asahi Kasei Aluminum powder paste MR-9000 100 parts Binder Union Carbide VAGH 120 parts Thickener Bentonite 10 parts Thinner MIBK 41 parts Cyclohexanone 41 parts Xylene 41 parts

Printing with silver ink is performed by Tetron #
Silk screen printing using 305 is performed by solid printing. Then, it is dried at 70 ° C. for 10 minutes. As a result, the masking layer 20 having a thickness of 2 μm is formed.

Further, a protective layer 22 is formed on the concealing layer 20. The material of the protective layer 22 is one that has been conventionally used as a protective layer in this type of magnetic recording medium, for example, cellulose resin, urethane resin, polyester resin, vinyl resin, epoxy resin, acrylic resin, or the like. Can be used. To these resins, phthalic acid ester, fatty acid ester, orthophosphoric acid ester or the like can be added as a plasticizer, and oleyl amide, stearyl amide, silicone, wax or the like can be added as a substance imparting lubricity. You can It should be noted that an ultraviolet curable resin or an electron beam curable resin can also be used, and as the ultraviolet curable resin, an acrylic resin, an epoxy resin, a polyester resin or the like can be used.

When the protective layer 22 is formed by printing, conventionally used inks are generally used, such as UV offset ink and T & K.
The TOKA UV Hakuriwet OP varnish UP-2 is printed by solid printing to form a protective layer 22 having a thickness of 1 to 2 μm.

If necessary, a precautionary note or the like may be printed with black ink before printing the protective layer 22. Color printing may be applied to the lower surface of the base material 12 in FIG. UV offset printing is usually used for such printing.

After that, a magnetic card is obtained by punching a card into a predetermined size, for example, a size specified in JIS X-6331.

The magnetic card manufactured in this way is
When read by the magnetic head 30 as shown in FIG. 7, a detection voltage e as shown in FIG. 7 is obtained. That is, when the card is transported in the longitudinal direction and the magnetic head 30 is placed at the position of the magnetic track 24 shown in FIG. 5, the detection voltage e can be obtained. As can be seen from FIG. 5, the portions other than the print pattern 16 are DC-magnetized, and the portions corresponding to the print pattern 16 are not magnetized.
An output pulse as shown in the figure is obtained at both ends of. Since the dummy pattern 18 has nothing to do with the magnetization of the magnetic track, an output pulse cannot be obtained at both ends of the dummy pattern 18.

As described above, since the magnetic output is obtained corresponding to the print pattern 16, the permanent magnetic pattern can be detected. It is easier to detect the output pulse if the azimuth of the magnetic head and the inclination of the edge of the print pattern 16 are matched.

In such a magnetic card, the positions and widths of the print pattern 16 and the dummy pattern 18 are variously changed to form digital data, which can be used as security data of the card. The part without pattern is used for normal magnetic recording.

Although the concealing layer 20 and the protective layer 22 are provided in each of the above-mentioned embodiments, these layers may be omitted. Moreover, you may provide another layer as needed.

[0045]

According to the present invention, a permanent magnetic pattern can be easily formed. Further, since it is possible to make it difficult to identify the magnetic pattern by forming the dummy pattern with the same ink as the print pattern corresponding to the magnetic pattern, it is possible to effectively prevent illegal use.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a magnetic recording medium according to the present invention.

FIG. 2 is a cross-sectional view showing a manufacturing process of a magnetic recording medium according to the present invention.

FIG. 3 is a cross-sectional view showing a manufacturing process of a magnetic recording medium according to the present invention.

FIG. 4 is a diagram showing an example of magnetization characteristics of a magnetic recording medium according to the present invention.

FIG. 5 is a diagram showing an embodiment in which the magnetic recording medium according to the present invention is applied to a magnetic card.

FIG. 6 is a diagram showing a state of magnetic orientation in a manufacturing process of a magnetic recording medium according to the present invention.

FIG. 7 is a diagram showing an example of output characteristics of a magnetic recording medium according to the present invention.

[Explanation of symbols]

 12 Base Material 14 Magnetic Layer 16 Printing Pattern 18 Dummy Pattern 20 Concealing Layer 22 Protective Layer 24 Magnetic Track 26 Bar Code Pattern 30 Magnetic Head

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location G06K 19/06 G11B 5/80 7303-5D

Claims (6)

[Claims] 1. A substrate, a magnetic layer formed on the substrate and magnetically oriented in a certain direction, and a print pattern formed on the magnetic layer with an ink capable of dissolving the magnetic layer. The magnetic recording medium is characterized in that the magnetic layer is disturbed in the magnetic orientation at a portion in contact with the print pattern, and is magnetically oriented in the predetermined direction except for a portion in contact with the print pattern. . 2. The magnetic recording medium according to claim 1, wherein the magnetic recording medium further has a dummy pattern formed on the magnetic layer with the same ink as the print pattern. A magnetic recording medium characterized in that a portion in contact with the dummy pattern is magnetically oriented in the predetermined direction. 3. The magnetic recording medium according to claim 2, further comprising a hiding layer provided on the print pattern and the dummy pattern, and a protective layer provided on the hiding layer. A magnetic recording medium having. 4. A method of manufacturing a magnetic recording medium having a permanent magnetic pattern formed by applying a magnetic coating material containing magnetic powder to a base material, magnetically orienting the magnetic coating material in a certain direction, and then drying. Forming a magnetic layer, forming a predetermined print pattern on the magnetic layer with an ink containing a solvent capable of dissolving the magnetic layer and not soluble after curing the magnetic layer, and corresponding to the print pattern A method of manufacturing a magnetic recording medium, comprising: a step of melting a magnetic layer to randomize a magnetic orientation; and a step of hardening the magnetic layer. 5. The method of claim 4, further comprising forming a dummy pattern with the ink on the magnetic layer after curing the magnetic layer, the method corresponding to the dummy pattern. The method of manufacturing a magnetic recording medium, wherein the magnetic orientation of the magnetic layer is in the fixed direction. 6. The method according to claim 5, further comprising forming a hiding layer on the printed pattern and the dummy pattern, and forming a protective layer on the hiding layer. And a method for manufacturing a magnetic recording medium.