JP2789703B2 - Manufacturing method of magnetic recording card - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] In recent years, magnetic recording cards have become widespread, mainly prepaid cards. The present invention is used in a prepaid card and the like, in a magnetic recording card having a magnetic barcode provided for fixed data recording also for the purpose of forgery prevention, embedded magnetic barcode in the magnetic recording layer, the surface of the magnetic recording layer The present invention relates to a manufacturing method for providing a magnetic recording card in which the surface of a concealing layer is made smooth by making it smooth, and the presence of a magnetic barcode cannot be visually confirmed.

[Prior Art] Conventionally, magnetic recording cards have been frequently used as ID cards or prepaid cards. Many of these magnetic recording cards are provided with a magnetic recording layer as shown in FIG. 3 after a magnetic recording layer is applied on the base material 1 in order to provide security by combining the dummy barcode 12 of the magnetic barcode 3. A magnetic bar code 3 having a low coercive force is provided on the layer 2 by using a method such as screen printing or offset printing, and a dummy bar code 12 having no residual magnetization is provided by the same method. Then, a concealing ink is applied thereon to form a concealing layer 4 to conceal the magnetic surface.

[Problems to be solved by the invention]

As described above, the magnetic barcode 3
, The security of the card itself is held by fixed data recorded by a magnetic barcode.

However, in the above-described conventional method for manufacturing a magnetic recording card, the register is likely to be misaligned when printing the magnetic recording card 3 and the dummy barcode 12, and when the conventional magnetic recording card is viewed from the barcode surface side, the magnetic barcode 3 In many cases, the dummy barcodes 12 are vertically displaced from each other. Further, since the materials of the two bars are different, their flatness is also different. Therefore, even if the concealing layer 4 is provided, it is relatively easy to visually confirm and identify the presence of the true magnetic barcode 3 and the dummy barcode 12. The fact that the magnetic barcode 3 and the dummy barcode 12 can be easily identified is nothing less than a reduction in the security of a magnetic recording card having a value equivalent to money.

Therefore, in view of the above, it is a fact that a magnetic recording card manufactured by a conventional manufacturing method cannot be said to have satisfactory security.

The present invention has been made to solve the above-described problem, and has as its object to provide a method for manufacturing a magnetic recording card in which the magnetic barcode 3 cannot be visually confirmed.

[Means for solving the problem]

In order to achieve the above object, the manufacturing method of the present invention is characterized in that the magnetic barcode 3 provided on the magnetic recording layer 2 is embedded in the magnetic recording layer by heating and pressing to smooth the surface of the magnetic recording layer 2. By providing the concealing layer 4 thereon, the magnetic barcode 3 cannot be visually checked.

[Action]

The magnetic recording card manufactured by the manufacturing method according to the present invention makes it impossible to visually confirm the presence of the magnetic barcode 3, thereby improving security, making forgery / duplication even more difficult. The dummy barcode 12 used in combination with is also unnecessary. Furthermore, since there is no protrusion on the card surface, it is expected that the wear resistance of the magnetic head is improved and the life of the card is extended.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing a configuration of a magnetic recording card according to the present invention. A magnetic recording layer 2 is provided on a substrate 1, and a magnetic barcode 3 is embedded in the magnetic recording layer 2 by heating and pressing. Further, a concealing layer 4 is provided thereon.

As the substrate 1, plastics such as polyvinyl chloride, polyester, polycarbonate, polymethyl methacrylate, and polystyrene, paper, synthetic paper, and the like can be used alone or as a composite. The magnetic recording layer 2 is made of a magnetic powder such as γ-Fe ₂ O ₃ , Co-coated γ-Fe ₂ O ₃ , Fe ₃ O ₄ , CrO ₂ , Fe, F
Conventionally known magnetic fine particles such as e-Cr, Fe-Co, Co-Cr, Co-Ni, MnAl, Ba ferrite, and Sr ferrite are dispersed in a suitable resin, and this dispersion is placed on a substrate 1 by a bar code. ,
Blade coat, air knife coat, gravure coat,
It is formed by applying and drying by a solvent coating method such as a roll coating method or a screen printing method. In addition, as the resin used at this time, a polyurethane resin, a vinyl chloride-vinyl acetate copolymer, a polyester resin, and the like can be considered. In order to embed the magnetic barcode 3 in the magnetic recording layer 2, thermoplastic resin is required. High resins are preferred. However, it is not limited to this. Even a thermosetting resin can be used in an uncured state. The magnetic barcode 3 is made of a magnetic powder having a low coercive force, for example, Fe, Ni,
Zn- ferrite, Ni-Zn- ferrite, Mn-Zn- ferrite, Fe ₂ O _3, etc., or permalloy, and dispersed alloy such as sendust in a suitable resin, screen printing, offset printing, a method of gravure printing The magnetic barcode 3 is formed on the magnetic recording layer 2 by using. The resin used at this time was polyurethane resin, vinyl chloride-
A vinyl acetate copolymer, a polyester resin, an epoxy resin, or the like can be considered.
It is preferable that the magnetic barcode 3 has a sufficient strength in order to embed the magnetic barcode 3 so as not to cause cracking or crushing. Therefore, it is preferable that the magnetic barcode 3 is sufficiently cured using a curing agent such as isocyanate. . However, the present invention is not limited to this, and even in an uncured state, if the magnetic barcode 3 has a relatively higher strength than the magnetic recording layer 2, nothing is done.

The magnetic barcode 3 formed on the magnetic recording layer 2 as described above is embedded by heating and pressing using a press machine. As the concealing layer 4, gravure printing, offset printing, screen printing,
It is formed using a method such as reverse roll coating.

 Hereinafter, an actual prototype will be described.

Prototype example (1) Ink for magnetic recording layer: Magnetic powder MC-127 (Toda Kogyo Co., Ltd.) 50 parts Vinyl chloride-vinyl acetate copolymer resin VAGH (Union Carbide Co., Ltd.) 20 parts Solvent VC202 (Toyo Ink Manufacturing) 100 parts of a magnetic paint having the above composition was applied to a 188 μm-thick polyethylene terephthalate film by a gravure method to form a 15 μm-thick magnetic recording layer 2. Next, using a magnetic barcode ink having the following composition, a magnetic barcode having a thickness of 10 μm was formed by a screen printing method, followed by aging at 70 ° C. for 48 hours to sufficiently remove the magnetic barcode 3. Cured.

Magnetic barcode ink: Iron powder 50 parts Vinyl chloride-vinyl acetate copolymer resin VAGH (Union Carbide Co., Ltd.) 10 parts Solvent S-787 (Toyo Ink Mfg. Co., Ltd.) 40 parts Isocyanate curing agent Coronate HL (Japan Polyurethane Industry Co., Ltd. 2 parts Further, using a hot press machine, the magnetic bar code 3 was embedded in the magnetic recording layer 2 by heating and pressing under the following conditions.

Hot pressing conditions: primary pressure 18 kg / cm ² , 100 ° C. secondary pressure 50 kg / cm ² , 100 ° C. Finally, on the magnetic recording layer 2 by screen printing using a commercially available concealable silver ink The concealing layer 4 was provided.

Prototype example (2) Ink for magnetic recording layer: Magnetic powder MC-127 (Toda Kogyo Co., Ltd.) 50 parts Vinyl chloride-vinyl acetate copolymer resin VAGH (Union Carbide Co., Ltd.) 10 parts Polyurethane resin Nipporan 2304 (Japan Polyurethane Industry Co., Ltd. 10 parts Solvent VC202 (Toyo Ink Manufacturing Co., Ltd.) 100 parts Isocyanate-based curing agent Coronate HL 4 parts A magnetic paint with the above composition is applied to a 188 μm thick polyethylene terephthalate film by gravure method. The magnetic recording layer 2 having a thickness of 15 μm was formed. Next, using a magnetic barcode ink having the following composition, a magnetic barcode having a thickness of 10 μm was formed by a screen printing method.

Magnetic barcode ink: Iron powder 50 parts Vinyl chloride-vinyl acetate copolymer resin VAGH (Union Carbide Co., Ltd.) 10 parts Solvent S-787 (Toyo Ink Mfg. Co., Ltd.) 40 parts Isocyanate curing agent Coronate HL (Japan Polyurethane Industry Co., Ltd. 2 parts Further, using a hot press machine, the magnetic bar code 3 was embedded in the magnetic recording layer 2 by heating and pressing under the following conditions. Thereafter, aging was performed at 70 ° C. for 48 hours.

Hot pressing conditions: primary pressurization 10 kg / cm ² , 100 ° C. secondary pressurization 50 kg / cm ² , 100 ° C. Finally, on the magnetic recording layer 2 by screen printing using a commercially available concealable silver ink The concealing layer 4 was provided.

The back surface of the magnetic recording card obtained by the above two methods is completely smooth, and it is impossible to visually confirm the presence of the magnetic barcode at all. It can be seen that this card has high security. .

Further, when a magnetic field was applied to the magnetic recording card and the output characteristics of the magnetic barcode 3 were examined, a characteristic diagram as shown in FIG. 2 was obtained, and it was found that the magnetic barcode 3 was operating reliably. Was.

〔The invention's effect〕

As described in detail above, since the magnetic barcode 3 cannot be visually checked, the present invention can provide a magnetic recording card with higher security than the conventional one. Also, since the conventionally used dummy barcode 12 becomes unnecessary, it is possible to realize security which does not depend on the registration accuracy of printing of the magnetic barcode 3 and the dummy barcode 12, which is one of the problems. Furthermore, since there is no protrusion on the back side of the magnetic recording card, that is, the magnetic recording surface side, the wear resistance to the magnetic head is improved,
Extending the life of the card, printing on the entire back of the card,
It is considered that the effect in practical use is large, for example, printing becomes a function.

[Brief description of the drawings]

1 shows an embodiment of the present invention. FIG. 1 is a cross-sectional view showing a configuration of a magnetic recording card manufactured by using the manufacturing method of the present invention, and FIG. 2 is a characteristic showing an output waveform of a magnetic bar code. FIG. FIG. 3 is a cross-sectional view illustrating a configuration of a magnetic recording card for explaining a conventional technique. DESCRIPTION OF SYMBOLS 1 ... Base material 2 ... Magnetic recording layer 3 ... Magnetic barcode 4 ... Concealment layer 12 ... Dummy barcode

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Terumi Hirano Examiner Hiroshi Kitaoka, Toppan Printing Co., Ltd., 1-5-1, Taito, Taito-ku, Tokyo (56) References JP-A-54-71699 (JP, A) JP-A-61-139498 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G11B 5/62-5/858

Claims (2)

(57) [Claims] In a magnetic recording card having a magnetic barcode provided on a magnetic recording layer, a magnetic barcode made of a thermosetting resin is formed on a magnetic recording layer formed of a magnetic paint using a thermoplastic resin. After the magnetic barcode is cured by heating, the magnetic barcode is embedded in the magnetic recording layer by heating and pressing, the surface of the magnetic recording layer is smoothed, and a concealing layer is provided on the magnetic recording layer, so that the magnetic barcode can be visually observed. A method for manufacturing a magnetic recording card, characterized in that it is impossible to confirm. 2. A magnetic recording card according to claim 1, wherein a magnetic barcode made of a thermosetting resin is formed on a magnetic recording layer formed by a magnetic paint using a thermosetting resin as a resin. In a state in which both are uncured, the magnetic barcode is embedded in the magnetic recording layer by applying heat and pressure, the surface is smoothed, and then cured by heating, and a concealing layer is provided on the surface of the magnetic recording layer, and the magnetic barcode is provided. A method for manufacturing a magnetic recording card, wherein visual confirmation is impossible.