JP2003103972A - Forgery preventing paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide forgery preventing paper constituted so as to eliminate such a trouble that printing by an electrophotographic method becomes a state not well performed because of thread, to well perform printing. SOLUTION: The forgery preventing paper 1 has a substrate 2 and the forgery preventing thread 3 provided to at least one place of the surface and surface layer part of the substrate and the substrate itself and at least one surface of the substrate is set to a surface printed by the electrophotographic method. The forgery preventing thread 3 has an insulating or semiconductive resin layer 4 on the outermost side becoming one surface of the substrate 2 thereof and a light reflecting layer 5 comprising a non-magnetic metal is provided to the inside of the resin layer 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-counterfeit sheet using an anti-counterfeit thread, and more particularly to an anti-counterfeit sheet for printing by electrophotography.

[0002]

2. Description of the Related Art In recent years, various security media such as gift certificates, gift certificates, certificates, tickets, voting tickets, tickets, and labels are provided with a ferromagnetic material thin film layer as a measure against the forgery. It is known that various threads are made into a base material such as paper. Forgery prevention by such a thread is performed at the stage of manufacturing a sheet, so that it is difficult to forge by a method such as color copying, scanner incorporation, and plate-making printing.

By the way, in the above security medium,
For the purpose of management, for example, in the case of a ticket or the like, a serial number is printed, and the place of sale, the seller, the date and time of sale, etc. are recorded. When recording is performed for each individual medium, or for each of a small number of mediums, the conventional printing method cannot handle the cost and time, so conventionally, handwriting with a pen or the like, Also, it was recorded by a rubber stamp or the like.

Recently, however, by operating a computer, for example, a laser printer,
Such a printing method is rapidly becoming popular because characters and the like can be printed easily and quickly. That is, such a printing method using a laser printer or the like is easier than a handwriting and has a good appearance, and it is also advantageous in terms of management because a printing record can be left.

[0005]

By the way, an electrophotographic printer such as a laser printer is of a type in which printing is carried out by transferring toner developed on a photosensitive drum onto a material to be printed. In this method, a material to be printed is charged by a charging unit such as a charging roll, so that the toner on the photosensitive drum is transferred to the material to be printed.

However, in the anti-counterfeit paper in which the thread is made into the base material, the thread portion is large because the resistance difference between the base material paper and the ferromagnetic material thin film layer in the thread is large. It shows a charging significantly different from that of the surrounding substrate portion. As a result, this thread causes irregularities in charging around the thread, resulting in unevenness in the resulting printed image and impairing the image quality.

The present invention has been made in view of the above circumstances, and an object of the present invention is to solve the inconvenience of being unable to perform electrophotographic printing satisfactorily due to threads so that printing can be performed satisfactorily. To provide anti-counterfeit paper.

[0008]

The anti-counterfeit paper of the present invention comprises a base material and a forgery prevention thread provided on at least one of the surface, the surface layer portion and the base material. An anti-counterfeit paper having at least one surface side of a base material as a printing surface for printing by an electrophotographic method, wherein the anti-counterfeit thread has an insulating or semi-conductive surface on the outermost side serving as the one surface side of the base material. The solution of the above-mentioned problems is provided by having a resin layer and having a light reflection layer made of a non-magnetic metal inside the resin layer.

Another forgery prevention sheet of the present invention comprises a base material and a forgery prevention thread provided on at least one of the surface, the surface layer portion and the base material. Of at least one side of which is an anti-counterfeit paper having a printed surface to be printed by an electrophotographic method, wherein the anti-counterfeit thread is an insulating or semi-conductive resin layer on the outermost side which is the one side of the substrate. And the inside of this resin layer is provided with a light reflection layer made of a non-magnetic metal and a ferromagnetic material thin film layer made of a ferromagnetic material for which recording for anti-counterfeiting is made in advance. And the solution.

According to these anti-counterfeit papers, since the anti-counterfeit thread has the insulating or semi-conductive resin layer on the outermost one side of the substrate,
On the one surface side of the base material that is the printed surface of the anti-counterfeit paper, the resin layer does not cause a large resistance difference with the surrounding base material. It is possible to prevent image quality defects such as print unevenness due to non-uniformity of toner transferability due to a resistance difference from the material portion.

In the anti-counterfeit paper, it is preferable to provide a protective layer inside the ferromagnetic material thin film layer for protecting the recording of the ferromagnetic material thin film layer.
When such a protective layer is provided, it is preferable to form the protective layer with an insulating resin film. By providing the protective layer in this manner, it is possible to prevent the recording of the ferromagnetic material thin film layer from being destroyed, for example, at the time of manufacturing the anti-counterfeit paper. In addition, if the protective layer is formed of an insulating resin film, when printing by electrophotography, when the anti-counterfeit paper is charged by a charging unit such as a charging roll at the time of transfer, protection made of the resin film The layer prevents the recording of the ferromagnetic material thin film layer from being affected by charging.

Further, in the forgery prevention paper,
The electric resistance of the resin layer is 10⁷ -10 ¹⁴Ω, volume electric resistance
Value is 10⁹ -10¹⁷It is preferably Ω · cm. this
By doing so, the base material that will be the printed surface of the anti-counterfeit paper
Between the resin layer and the surrounding substrate on the surface side of
For the prevention of forgery
Due to the resistance difference between the thread part and the surrounding base material part
Image quality due to uneven printing due to uneven toner transferability
Defects are more reliably prevented and therefore good image quality
Can be printed.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is described in detail below.
1A and 1B are views showing an example of the anti-counterfeit paper of the present invention, and reference numeral 1 in FIGS. 1A and 1B is the anti-counterfeit paper. The anti-counterfeit paper 1 is made by incorporating a forgery prevention thread 3 into the surface layer of a base material 2 made of paper.

As shown in FIG. 1B, the forgery prevention thread 3 has an insulating or semiconductive resin layer 4 on the outermost side which is the surface side of the base material 2, and the inside of this resin layer 4. A light reflection layer 5 made of a non-magnetic metal is provided on the lower side, and a ferromagnetic material thin film layer 6 made of a ferromagnetic material is preferably provided on the inner side (lower side) of the light reflection layer 5. The magnetic material thin film layer 6 has a protective layer 7 on the inner side (lower side) for protecting the recording.

The resin layer 4 is made of a resin film having water resistance and heat resistance, and specifically, polyethylene terephthalate (PET) resin film, polyester resin film, polyamide resin film, polyimide resin film, polycarbonate resin film, It is formed of a polystyrene resin film, a polypropylene resin film, a polysulfone resin film, a polyphenylene sulfide resin film, a cellulose resin film, or the like. The thickness of the resin layer 4 made of such a resin film is preferably about 1 to 300 μm, more preferably about 5 to 50 μm.

Here, regarding such a resin layer 4,
It is desirable that the toner transfer property is substantially the same as that of the base material 2 in which the forgery prevention thread 3 is incorporated. Specifically, the surface electric resistance value is 10 ⁷ which is the surface electric resistance value of general paper.
It is preferably 10 ¹⁴ Ω, more preferably 10 ⁷ to 10 ¹³ Ω. Also, regarding the volume electric resistance value,
It is preferably 10 ⁹ to 10 ¹⁷ Ω · cm. In order to make the resin layer 4 have a resistance value in such a range, the resin film is kneaded with a conductive filler such as carbon in advance, or the surface thereof is coated with a conductive filler. Alternatively, the resin film may be imparted with semiconductivity by applying an antistatic agent in advance.

The light reflecting layer 5 is made of a light reflecting non-magnetic metal, that is, gold, silver, aluminum, chromium or the like. However, aluminum is particularly preferably used from the viewpoint of cost and technology. Although the thickness of the light reflection layer 5 is not particularly limited, it is preferably about 10 nm to 200 nm, more preferably about 20 nm to 100 nm in order to exhibit good light reflection characteristics.

The ferromagnetic material thin film layer 6 is made of any one or two of iron (Fe), cobalt (Co), and nickel (Ni).
Based on a magnetic material consisting of a combination of more than one species,
Boron (B), carbon (C), magnesium (M
g), aluminum (Al), silicon (Si), phosphorus (P), sulfur (S), titanium (Ti), vanadium (V), chromium (Cr), manganese (Mn), copper (C)
u), zinc (Zn), yttrium (Y), zirconium (Zr), niobium (Nb), molybdenum (Mo), palladium (Pd), silver (Ag), indium (In),
Tin (Sn), tantalum (Ta), tungsten (W),
One or more kinds of metal or non-metal element selected from iridium (Ir), platinum (Pt), gold (Au) and lead (Pb) are added as an additive.
The magnetic material forming the ferromagnetic material thin film layer 6 may be crystalline or amorphous.

The protective layer 7 is made of an insulative resin film like the resin layer 4, and specifically, a polyethylene terephthalate (PET) resin film, a polyester resin film, a polyamide resin film, a polyimide resin film, Polycarbonate resin film, polystyrene resin film, polypropylene resin film,
It is formed from a polysulfone resin film, a polyphenylene sulfide resin film, a cellulose resin film, or the like. The protective layer 7 made of such a resin film is usually disposed inside the base material 2 and is not located on the front surface side. It is not necessary to impart semiconductivity by kneading a filler or the like or coating the surface with a conductive filler.

Due to such a structure, the forgery prevention thread 3
First, the ferromagnetic material thin film layer 6 is formed on the protective layer 7 as a base. For forming the ferromagnetic material thin film layer 6, for example, sputtering, vapor deposition, or ion plating is performed using, as a target material or a vapor deposition source, a material containing an alloy containing iron, cobalt, nickel as a main component and an additive element or a mixture thereof. And the like using a vacuum process. Here, as the ferromagnetic material, a material represented by cobalt Co-zirconium Zr system or iron Fe-silicon Si is preferable.

The ferromagnetic material thin film layer 6 thus formed
The thickness is preferably about 50 to 500 nm. When the thickness is less than 50 nm, the thickness of the ferromagnetic material thin film layer becomes thin, so that the saturation magnetic flux decreases as the absolute amount of the magnetic material decreases, and the magnetic signal decreases. That is, in order to obtain a magnetic signal used for authenticity determination, the thickness of the magnetic substance needs to be 50 nm or more. Also, 50
If it exceeds 0 nm, the characteristics of the thread may be deteriorated due to curling due to the internal stress of the film (thin film layer 6), and wrinkles and cracks may occur. From the viewpoint of the productivity of the ferromagnetic material thin film layer 6 and the stability of magnetic signals, the more preferable thickness of the ferromagnetic material thin film layer 6 is 150 to 300 nm.
The range is (0.15 to 0.3 μm). When the ferromagnetic material thin film layer 6 is patterned, it can be patterned by a process such as a wet etching method or a lift-off method in addition to a dry process of forming a pattern with a laser beam. In the case of laser processing, it is possible to scan the surface of the ferromagnetic material thin film layer 6 with a YAG laser (wavelength 1064 nm) beam to form a pattern.

Next, the light reflection layer 5 made of aluminum or the like is formed on the ferromagnetic material thin film layer 6 by vapor deposition or the like. Then, a resin layer 4 made of a resin film is formed on the light reflection layer 5.
Is attached via an adhesive layer (not shown) to form the forgery prevention thread 3. Then, before or after the anti-counterfeit thread 3 is made into the base material 2 with respect to the ferromagnetic material thin film layer 6 of the anti-counterfeit thread 3 thus obtained, the obtained anti-counterfeit paper is Records corresponding to the application,
That is, magnetic information is added. In addition, the forgery prevention thread 3 thus obtained is shown in FIG.
A state in which the exposed portion 3a where the resin layer 4 is exposed and the covering portion 3b which is embedded in the base material 2 are alternately repeated along the short side direction of the anti-counterfeit paper 1 as shown in FIG. Be cut into.

In the anti-counterfeit paper 1 having such a structure, the resin layer 4 of the anti-counterfeit thread 3 on the front surface side of the substrate 2 is formed of an insulating or semi-conductive resin film. Therefore, the resin layer 4 does not cause a large resistance difference between the resin layer 4 and the surrounding base material 2 on the front surface side of the base material 2 which is the printing surface of the anti-counterfeit paper 1. Therefore, when printing is performed on the printing surface by an electrophotographic method such as a laser printer, there is almost no resistance difference between the portion of the forgery prevention thread 3 and the surrounding base material 2 portion. Image quality defects such as unevenness are eliminated,
As a result, printing with good image quality can be performed.
If the electrical resistance value of the resin layer 4 is adjusted to be substantially equal to the electrical resistance value of the base material 2, the resistance between the portion 3 of the forgery prevention thread 3 and the peripheral portion of the base material 2 is reduced. It is possible to more reliably prevent image quality defects such as print unevenness due to the difference, and therefore it is possible to perform printing with better image quality.

In the anti-counterfeit paper 1, the ferromagnetic material thin film layer 6 is provided with the protective layer 7 for protecting it, so that the ferromagnetic material thin film layer 6 is protected. By protecting the record, the forgery prevention function of the forgery prevention thread 3 can be surely retained. Further, in particular, since the protective layer 7 is formed of an insulating resin film, the protective layer made of a resin film is formed when the anti-counterfeit paper 1 is charged by a charging unit during transfer during printing by electrophotography. By 7, it is possible to prevent the recording of the ferromagnetic material thin film layer 6 from being affected by charging and being changed or lost.

In the above example, the forgery prevention thread 3 is used.
In the preparation of, the ferromagnetic material thin film layer 6, the light reflection layer 5, and the resin layer 4 were formed in this order on the protective layer 7 as a base, but the present invention is not limited to this, and for example, a resin layer Alternatively, the light reflection layer 5, the ferromagnetic material thin film layer 6, and the protective layer 7 may be formed in this order on the basis of No. 4. In that case, it is preferable that the protective layer 7 is attached to the ferromagnetic material thin film layer 6 via an adhesive layer (not shown).

When such a manufacturing method is adopted,
Since the light reflecting layer 5 is formed prior to the ferromagnetic material thin film layer 6, the light reflecting layer 5 functions as a surface smoothing layer, so that the coercive force of the ferromagnetic material thin film layer 6 formed thereon is increased. Can be better. That is, since the surface of the resin layer 4 made of a resin film has microscopic asperities when viewed microscopically, it is possible to stably produce a ferromagnetic thin film having hysteresis characteristics having a large squareness ratio on the surface. Although difficult, it is possible to improve the coercive force of the obtained ferromagnetic material thin film layer 6 by forming the ferromagnetic material thin film layer 6 through the light reflecting layer 5 formed relatively smoothly by vapor deposition or the like. You can do it.

Although paper is used as the base material in the above example, the present invention is not limited to this, and synthetic paper obtained by laminating resin films instead of general paper or non-woven fabric is used as the base material. It may be used as a material. When such a synthetic paper or non-woven fabric is used as the base material, the forgery prevention thread 3
In place of providing the base material 2 on the surface layer of the base material 2,
It may be provided in the base material, that is, inside the base material.
Further, a resin film may be used as the base material, and the forgery prevention thread 3 may be attached to the surface of the base material.
According to this structure, by forming the base material 2 and the resin layer 4 from the same resin film, the resistance difference between the portion of the forgery prevention thread 3 and the peripheral portion of the base material 2 can be made substantially zero. As a result, it is possible to more reliably prevent image quality defects such as print unevenness due to the resistance difference, and enable printing with good image quality.

Although the anti-counterfeit paper of the above-mentioned example is provided with the ferromagnetic material thin film layer 6 to constitute the anti-counterfeit thread 3, the present invention does not necessarily require the ferromagnetic material thin film layer 6. The forgery prevention thread 3 may be simply composed of the resin layer 4 and the light reflection layer 5. However, in this case, in order to exert the anti-counterfeit effect, it is necessary to provide the anti-counterfeit thread 3 on the surface or the surface layer of the base material.

[0029]

EXAMPLES The present invention will be described more specifically by way of examples. (Preparation of magnetic thread) A polyethylene terephthalate film having good smoothness and transparency ("Lumirror-S-2" manufactured by Toray Industries, Inc.) was used as a base film for the forgery prevention thread.
8 ”) [thickness: 16 μm] was used. Then, an average film thickness of aluminum is 0.03 μm on this base film.
To form a surface smoothing layer. Then, on this surface smoothing layer, iron (Fe) -silicon (S
The ferromagnetic material thin film layer made of i) was formed by sputtering to a thickness of 0.2 μm. Then, in order to repeatedly provide the reduced bar code mark within the width of 2 mm of the ferromagnetic material thin film layer, mark writing was performed by a YAG laser (wavelength 1064 nm). Diameter about 5
A 0 μmφ beam was scanned in parallel, and a removed portion of the ferromagnetic material thin film layer having a width of 50 μm was formed in stripes at intervals of 100 μm to provide a clear barcode mark. The processing conditions for laser processing are as follows. <Processing conditions> -Device: "Laser marker FL-50" manufactured by Fuji Electric Co., Ltd.-Irradiation energy: 5 to 6 W (current value 8 A) -Scan speed: 100 mm / sec

(Light Reflecting Layer) Aluminum was further vapor-deposited on the surface of the ferromagnetic layer of the thread so as to have an average film thickness of 0.03 μm to form a light reflecting layer. (Protective layer) A transparent polyethylene terephthalate film with good smoothness ("Lumirror-S-2" manufactured by Toray Industries, Inc.
8 ”) [thickness: 16 μm] was used as a protective layer, and a vinyl chloride / vinyl acetate-based adhesive was applied thereon to a thickness of 1 μm. Subsequently, the film serving as a protective layer was attached to the light reflection layer by this adhesive layer. (Adhesive layer) A vinyl chloride-based adhesive is applied to the back surface of the base film of the thread after the processing in a thickness of 1 μm, and then,
A slit machine was used to slit into a width of 2 mm to produce a forgery prevention thread. As a result of measuring the magnetic properties of this thread, the squareness ratio of 0.9
The coercive force was 30 L threads. Further, the squareness ratio of the portion not provided with the surface smoothing layer, which was separately conducted in a comparative test, was 0.
It was 5. The measurement was performed by measuring with a DC magnetic field of VSM (sample vibration type speedometer). Also, B-H in an alternating magnetic field
The same result was obtained by measurement with an analyzer.

(Papermaking of anti-counterfeit paper) In order for the anti-counterfeit thread produced above to partially appear on the surface of the anti-counterfeit paper, the exposed portion is repeated at a pitch of 10 mm × 10 mm and the covering portion is repeated at a pitch of 10 mm. The paper was made into a high-quality paper of 90 kg / 46th plate with a paper machine having a screen pattern. Incidentally, the upper part of the stock of the cover portion is 35 g / m ^2, the lower part of the stock of the covering portion has adjusting the height of the convex portion of the network part paper making such that the 69 g / m ^2. When the thus manufactured anti-counterfeit paper was read by the magnetic head, the bar code composed of the ferromagnetic material thin film layer could be read. (Electrophotographic printing on anti-counterfeit paper) Oki Electric Co., Ltd. "MICROLINE
It was printed using "3010C" (electrophotographic). On the thread side, a high-quality image could be obtained on any part except the thread part. Further, on the back surface side of the thread, a high-quality image could be obtained on any part of the entire surface.

[0032]

As described above, the anti-counterfeit paper of the present invention is configured such that the anti-counterfeit thread has an insulating or semi-conductive resin layer on the outermost one side of the substrate. Therefore, the resin layer does not cause a large resistance difference between the resin layer and the surrounding base material on at least the one surface side of the base material which is the printed surface of the anti-counterfeit paper. Therefore, when printing is performed on the printed surface by an electrophotographic method such as a laser printer, there is almost no resistance difference between the forgery prevention thread portion and the base material portion around the forgery prevention thread. Image quality defects such as print unevenness due to non-uniformity of transferability are eliminated, and thus printing with good image quality can be performed.

Further, if a protective layer for protecting the recording of the ferromagnetic material thin film layer is provided inside the ferromagnetic material thin film layer, the ferromagnetic material thin film layer can be used, for example, in manufacturing anti-counterfeit paper. It is possible to prevent that the record of is destroyed. Furthermore, when such a protective layer is provided,
When the protective layer is formed of an insulating resin film, the protective layer made of a resin film is formed when the anti-counterfeit paper is charged by a charging unit such as a charging roll during transfer during printing by electrophotography. As a result, it is possible to prevent the recording of the ferromagnetic material thin film layer from being affected by charging and being changed or lost.

The surface electric resistance value of the resin layer is 10
⁷ to 10 ¹⁴ Ω, volume electric resistance value is 10 ⁹ to 10 ¹⁷ Ω · c
When m is set, the resin layer causes almost no resistance difference with the surrounding base material on the front surface side of the base material which is the printing surface of the forgery prevention paper. It is possible to more reliably prevent image quality defects such as print unevenness due to non-uniformity of toner transferability due to resistance difference between the base material and the surrounding base material portion, and thus to perform printing with better image quality. it can.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of an anti-counterfeit paper of the present invention, (a) is a plan view of the anti-counterfeit paper, and (b) is (a).
2 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

1 ... Anti-counterfeit paper, 2 ... Base material, 3 ... Anti-counterfeit thread, 4 ... Resin layer, 5 ... Light reflecting layer, 6 ... Ferromagnetic material thin film layer,
7 ... Protective layer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ identification code FI theme code (reference) G03G 7/00 101 G03G 7/00 101P 101Q G07D 9/00 461 G07D 9/00 461Z F term (reference) 2C005 HA02 HB10 HB11 HB13 JB28 KA40 KA49 3E040 AA05 BA20 DA04 4L055 AG03 AG82 AG99 AH50 AJ01 AJ10 BD11 BD17 BD20 EA19 FA30 GA11 GA45

Claims (8)

[Claims] 1. A base material, and a forgery prevention thread provided on at least one of the surface, surface layer and base material, and at least one surface side of the base material is printed by electrophotography. In the anti-counterfeit paper which is the printed surface, the anti-counterfeit thread has an insulating or semi-conductive resin layer on the outermost one side of the substrate, and the inside of this resin layer An anti-counterfeit paper having a light reflecting layer made of a non-magnetic metal. 2. A substrate, and a forgery prevention thread provided at at least one position on the surface, surface layer portion and substrate, wherein at least one surface side of the substrate is printed by electrophotography. In the anti-counterfeit paper which is the printed surface, the anti-counterfeit thread has an insulating or semi-conductive resin layer on the outermost one side of the substrate, and the inside of this resin layer An anti-counterfeit paper comprising a light-reflecting layer made of a non-magnetic metal and a ferromagnetic material thin film layer made of a ferromagnetic material on which anti-counterfeit recording is made in advance. 3. The forgery prevention according to claim 1 or 2, wherein a protective layer for protecting the recording of the ferromagnetic material thin film layer is provided inside the ferromagnetic material thin film layer. Paper. 4. The anti-counterfeit paper according to claim 3, wherein the protective layer is made of an insulating resin film. 5. The surface electric resistance value of the resin layer is from 10 ⁷ to
The anti-counterfeit paper according to any one of claims 1 to 4, which has a resistance value of 10 ¹⁴ Ω and a volume electric resistance value of 10 ⁹ to 10 ¹⁷ Ω · cm. 6. The base material is made of one kind selected from paper, synthetic paper and non-woven fabric, and the anti-counterfeit thread is provided on the surface layer of the base material.
The anti-counterfeit paper according to 3, 4, or 5. 7. The base material is made of one selected from paper, synthetic paper and non-woven fabric, and the forgery preventing thread is provided in the surface layer portion of the base material or in the base material. Item 4. An anti-counterfeit paper according to item 2. 8. The anti-counterfeit paper according to claim 1, wherein the base material is made of a resin film, and the anti-counterfeit thread is attached to the surface of the base material.