JP3075454B2 - Anti-counterfeit paper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to anti-counterfeit paper. More specifically, the present invention relates to a forgery prevention sheet that can obtain only a copy having a color tone completely different from that of an original even when a copy is performed by a copying machine.

[0002]

2. Description of the Related Art The accuracy of recent copying machines has been remarkably improved, and in particular, the spread of electrophotographic color copying machines has facilitated forgery of various securities. To prevent this, various anti-counterfeiting means have been considered, but one of them is to utilize the fact that current copiers cannot reproduce brilliant ones, for example, metallic colors or interference colors. There is something.

For example, as proposed in Japanese Utility Model Application Laid-Open No. 58-168754, a luminous plate such as an aluminum foil having a remarkable metallic color is provided on the upper surface of a base paper, and a character pattern is formed on the luminous plate surface. There is a proposal for paper that cannot be copied by the machine.
When this is copied, the character pattern applied to the paper surface becomes unreadable because the foil surface is darkened and copied when light is irradiated from the copying machine. This sheet has the advantage that copying itself cannot be performed (the copy cannot be read), but has the disadvantage that the metallic color is emphasized too much because the area of the glittering plate occupying the sheet is so uncomfortable. In addition, there are other problems, such as a complicated paper manufacturing process, which inevitably increases the cost, and difficulty in recovering papermaking fibers from waste paper.

[0004] The present inventors have conducted studies for the purpose of solving these problems. The inventors of the present invention have changed their ideas and have noticed that even if they are copied by a color copying machine, if they are copied in a hue different from that of the original document, it can be determined whether they are genuine.

The present inventors first sliced a silver-aluminized polyester film excellent in brilliancy,
We considered making it into paper. Since the paper produced in this way cannot reproduce the metallic glossiness with a color copying machine, the portion where the strips are mixed is simply copied in black, which proves that the paper has anti-counterfeiting ability. However, it was found that in the paper manufactured in this manner, the strip did not adhere firmly to the paper, and the strip was dropped during printing, causing a serious problem. Further, this paper has another problem that it is difficult to remove the polyester film constituting the strip, and it is extremely difficult to recover the papermaking fibers from waste paper or waste paper.

[0006]

The present inventors have previously proposed an invention which has solved the above problems as Japanese Patent Application No. Hei 5-11409. The gist of the present invention is that in a forgery prevention paper in which glittering strips are ubiquitously present on the surface of the base paper, the strips have a performance capable of adhering to the base paper in the paper making process. Anti-counterfeit paper. Sprinkling the fines on a paper web on a fourdrinier paper machine or a fourdrinier paper machine. The method can be ubiquitous on the surface of the base paper by a method of spraying and sprinkling fine particles on a wet paper just before a press roll, a method of mixing fine particles into a coating liquid of a size press device and coating. The present inventors have further studied for the purpose of obtaining a new forgery prevention paper.

[0007]

The proposal makes use of the fact that the glittering color of glittering strips is not reproduced by a color copier. This requires that the strip be ubiquitous near the surface of the paper. If a small piece is contained in the paper, the brilliant color of the small piece does not come out on the surface, so that the forgery preventing ability cannot be obtained. Therefore, in the method of mixing paper into paper stock in advance and making paper, the percentage of the fines entering the inside of the paper layer increases, and the purpose cannot be achieved. As a result of further study by the present inventors, the outermost layer of the laminated paper was made to have a specific basis weight, that is, by reducing the thickness of the outermost layer, the brilliant color of the strip mixed therein was lost. The present invention has been completed and the present invention has been completed.

[0008] That is, the present invention comprises two or more layers of laminated paper, the outermost paper layer of which is 20 to 50 g / m ² , and includes a peculiarly bright strip. It is forgery prevention paper. The present invention will be described in more detail with reference to FIG. FIG. 1 is a partially enlarged sectional view of an example of the forgery prevention paper of the present invention. This figure shows an example of two-layer papermaking, in which the paper layer 1 and the paper layer 2 are manufactured using a circular paper machine. The outermost paper layer (in this case, the paper layer 2) contains glittering strips 3, and the paper layer 2 has a dry weight of 20 to 50 g / m ² , preferably 30 to 40 g / m ² .
m ² . If the paper layer 2 is less than 20 g / m ² , it is difficult to make paper. If the paper layer 2 exceeds 50 g / m ² , the loss of the glitter color of the mixed glittering strips 2 increases.

In the present invention, it is preferable that the strip 3 can be adhered to the papermaking fibers constituting the paper in the drying zone of the papermaking process. This is because the strips can be prevented from falling off in the printing process or the like. One means for achieving this is that one of the components of the glittering strip has a hot water dissolving temperature of 60-8.
The use of a 0 ° C. film. Another means is to use a hot water-soluble binder having a hot water dissolving temperature of 60 to 80 ° C. as one of the constituent elements as described in detail later. By doing so, the film or binder swells due to the heat generated when the wet paper is dried in the drying step during papermaking, and firmly adheres to the papermaking fibers constituting the paper.

[0010] The hot water-soluble film or binder to be used must not dissolve or excessively swell the film or binder with water at the time of forming the paper web (wet part).
The wet paper drying zone (multi-cylinder cylinder drier or Yankee drier) during the paper making process must not be deformed, which is a practical problem, and must have excellent adhesion to paper after drying. It was also found that things had this performance.

[0011] Another advantage is that when producing paper,
For example, it is easy to treat waste paper or waste paper that always occurs in a paper printing process or the like. This is because, by heating the water with a beater, a pulper, or the like, and treating the waste paper or waste paper, the film or the binder constituting the strip can be easily dissolved.

There are various water-soluble films and binders, such as starch, methylcellulose, carboxylated methylcellulose, hydroxyethylcellulose, polyvinyl alcohol (hereinafter referred to as PVA), polyvinylpyrrolidone, vinylethyl ether-maleic anhydride. Examples thereof include copolymers, polyacrylic acids, and polyethylene oxide films and binders. The film and the binder used in the present invention are 60 to
It is necessary to dissolve in hot water at 80 ° C, and the above water-soluble polymers included in this range, or those having a functional group introduced into them or having a dissolution temperature increased by using a water-proofing agent in combination Can be used.

In the present invention, it is preferable to use PVA because it is relatively inexpensive, easily available, and has appropriate physical strength. The solubility of PVA in water is largely controlled by the degree of polymerization and the degree of saponification, particularly the degree of saponification. For example, water having a saponification degree of 88% or less completely dissolves in water at 20 ° C., but about 50% at a saponification degree of 97%.
It can be dissolved at about 80 ° C for the first time in complete saponification with hot water at ℃. If the material melts at a temperature of less than 60 ° C., when the flakes are cut into pieces and incorporated, the flakes dissolve or excessively swell in the drying zone of the paper machine, and the predetermined shape cannot be maintained.
For those that dissolve at 0 ° C or higher, the slurry is collected at 80 ° C
Since it is extremely difficult and dangerous to reach the above temperature, the dissolution temperature must be in the above range. The thickness of the hot water-soluble film is usually 5 to 100 µm, preferably 10 to 25 µm.

Next, an example of producing a glittering strip will be described. Example 1 A metal-deposited layer of aluminum, tin, zinc, chromium, cobalt, nickel, copper, gold, silver, or the like is formed on one or both sides of the above-described hot water-soluble film by vacuum evaporation, sputtering, or ion plating. And the like. The deposition thickness is typically in the range of 200 to 1500 Angstroms. In the present invention, it is preferable to use aluminum as the metal in the present invention because it is inexpensive, hardly corrodes, has excellent metallic luster, and easily dissolves in alkali.

Next, a coating layer made of a resin or a resin and a colorant is formed on the deposition surface. It is desirable to use an organic solvent-based resin because it prevents deformation of the hot water-soluble film and does not impair coatability, and a resin that is soluble in a hot alkaline aqueous solution is used in consideration of wastepaper recovery efficiency. It is particularly preferred to do so. Examples of resins that are soluble in hot alkaline aqueous solutions include vinyl acetate resins, polyester resins, acrylic resins, polycarbonate resins, polyacetal resins, ionomer resins, nitrocellulose resins, acetylcellulose resins, and maleic acid resins. Phenol-based resin, melamine-based resin, urea-based resin, casein-based resin, shellac-based resin, etc., or a resin modified by introducing a functional group such as a hydroxyl group or a carboxyl group so that these become alkali-soluble. Alternatively, a mixture thereof may be used. In the present invention, 60 to 80 of these resins are used.
It is preferable to select and use one that does not dissolve in hot water but dissolves in hot alkaline water for the first time in the temperature range of ° C. The alkali concentration at the time of pulp recovery treatment from broke is usually 0.01
Since it is in the range of 0.5% by weight, it is preferable to use a resin that dissolves in this range.

As the coloring agent, organic pigments, inorganic pigments, dyes and the like can be used. In the case of performing color coating on the vapor deposition layer, it is preferable to use a dye in order not to lower the metallic luster.
When no coloring agent is used, a deposited metal color, for example, aluminum can be used to obtain a silver color, and a yellow color can be used to obtain a gold color. In addition, auxiliary agents such as a viscosity adjusting agent and a curing agent may be used in combination as long as the object of the present invention is not impaired. In some cases, an anchor coating layer and a back coating layer are provided. The resin used for the anchor coating layer and the back coating layer are preferably dissolved in a hot alkaline aqueous solution at 60 to 80 ° C., and a coloring agent and other additives can be used in combination. The paint prepared in this way is applied to the deposition surface or the film surface.
To 10 μm, preferably 2 to 5 μm. The sheet produced in this way is shredded in the manner described below.

Example 2 Use of Transfer Foil Transfer foils having an interference color and transfer foils having a metal color are known as transfer foils having brilliancy. For example, a transfer foil having an interference color is formed by sequentially forming a resin layer (a coating layer mainly serving as a release layer and a surface protection layer, for example, a nitrocellulose base material) and a very thin aluminum vapor-deposited layer (light It is composed of a semi-transmissive layer), a very thin resin coating layer (interference layer), an aluminum deposition layer (light reflection layer), and a heat-sensitive adhesive layer. In another example, an interference layer formed by depositing an inorganic oxide such as SiO2 is formed instead of the above-described interference layer made of a resin. As another example, a transfer foil utilizing a hologram interference color is known. this is,
A resin layer (for example, a coating layer mainly composed of nitrocellulose, which also functions as a release layer and a surface protection layer) is formed on the polyester base film, and a hologram pattern is heat-embossed on the surface thereof. And a layer having a heat-sensitive adhesive layer formed thereon.
Using these transfer foils, the heat-sensitive adhesive is combined with a substrate surface, for example, a hot water-soluble film surface, passed between hot rolls, bonded together, cooled, peeled off the polyester base film, and cut into pieces. Further, a hot water-soluble film may be further attached to the transfer surface using, for example, a polyurethane-based adhesive or the like to form a small piece. This configuration has the advantage that the hot water-soluble film surface is located on the outside of both surfaces, so that the adhesion to the paper becomes stronger.

The metal transfer foil is formed, for example, by coating a resin layer (for example, nitrocellulose serving as a release layer and a surface protection layer, for example, with nitrocellulose as a main component and, if necessary, a colorant) on a polyester base film. Layer), an aluminum vapor-deposited layer, and a heat-sensitive adhesive layer. Using this transfer foil,
The heat-sensitive adhesive is combined with a substrate surface, for example, a hot water-soluble film surface, passed between hot rolls, bonded together, cooled, peeled off the polyester base film, and cut into pieces. Further, a hot water-soluble film may be further attached to the transfer surface using, for example, a polyurethane-based adhesive or the like to form a small piece. This configuration has the advantage that the hot water-soluble film surface is located on the outside of both surfaces, so that the adhesion to the paper becomes stronger.

Example 3 A method in which a coating liquid obtained by mixing a hot water-soluble binder with a metal powder or a pearl pigment is applied to paper to form a small piece. Pearl pigments used in the present invention, natural pearl essence,
Known pearl pigments such as mica powder, mica powder coated with titanium oxide, basic carbonate, and fish scale foil can be used. These production methods and the like are described in JP-B-35-5367 and JP-B-39-288.
No. 85, JP-B-48-23179, JP-B-47-29
No. 569, JP-B-53-47375, JP-B-56-3
No. 9669, Japanese Patent Publication No. 58-7676, Japanese Patent Publication No. 1-22
No. 873, JP-B-4-48812, JP-A-58-17.
4449, JP-A-58-180561, JP-A-58-180561
JP-A-219226, JP-A-59-78265, JP-A-60-92359, JP-A-62-34962, JP-A-62-285596, JP-A-4-227666,
And the like. Some pearl pigments emit an iris color and are characterized by a change in hue depending on the viewing angle. As the pearl pigment used in the present invention, it is particularly preferable to use a pearl pigment that emits this iris color. This is because by arranging strips emitting different iris colors on the paper, the forgery prevention ability is enhanced, and the design effect is also enhanced. In the present invention, a paint is prepared by adding usually 80 to 300 parts by weight of a hot water-soluble binder such as polyvinyl alcohol to 100 parts by weight of metal powder such as aluminum or brass or the pearl pigment as described above. After coating on a base paper having a basis weight of 30 to 100 g / m 2, it is cut into small pieces.

Example 4 A method in which a coating liquid in which a binder is mixed with metal powder or pearl pigment is applied to paper, and a hot water-soluble binder such as PVA is coated on the surface of the paper to form a small piece. The strip of this configuration has the advantage that the adhesion to paper is better than the strip of Example 3.

Example 5 A method in which a hot water-soluble film is bonded to both surfaces of a brilliant film to form pieces. Examples of the film having glitter include a polyester film formed by depositing a metal, a polyester film having a resin layer formed thereon, a hologram pattern embossed on the surface thereof, and a metal deposited, and a hologram pattern directly embossed on a vinyl chloride film. Metal thin film, polyester film thin metal film (semi-transmissive layer), then interference layer,
Any of a metal vapor-deposited layer (light reflecting layer) formed, a metal powder coated on a base sheet with an adhesive, and a pearl pigment coated on a base sheet with an adhesive can be used. A hot water-soluble film is adhered to both sides of the glittering film using a polyurethane-based dry laminating adhesive or the like, and cut into pieces.

Example 6 A method in which a metal powder or a pearl pigment is kneaded into a hot-water-soluble resin and formed into a film to be fragmented. When a leaf-shaped metal powder or a pearl pigment is kneaded, the brilliancy is improved by stretching the film uniaxially or biaxially.

In the present invention, any shape such as a circle, an ellipse, a square, a rectangle, and a star can be selected as the shape of the strip. Any method can be adopted as the method, such as a method of punching out using the tooth profile of the above-mentioned shape, or a method of slitting with a microslitter and cutting it into small pieces. The size of fragmentation is usually about 0.2 to 10 mm.

The anti-counterfeit paper of the present invention includes bleached softwood kraft pulp (NBKP) and hardwood bleached kraft pulp (LB).
KP), softwood bleached sulphite pulp (NBSP), thermomechanical pulp (TMP), and other paper-making fibers, with a dry paper strength enhancer, wet paper strength enhancer, sizing agent, fixing agent, retention aid, A freeness improver, an antifoaming agent, a dye, a coloring pigment, a fluorescent agent and the like are appropriately used in combination, and usually have a freeness of 550 to 250 ml. S. F. And a well-known combining means such as a combination of a short netting machine and a round netting machine, or a combination of a round netting machine and a round netting machine. The assembling is performed in two or more layers, and a glittering strip is mixed in the stock forming the outermost paper layer as described above, and the dry weight is 20 to 50 g / m 2, preferably 30 to 40 g. / M2 and papermaking with other paper layers, usually with a basis weight of 80 to 300
g / m2 of anti-counterfeit paper is obtained. The assembling may be performed in three or more layers, and the strip is mixed into one or both of the outermost paper layers (in this case, the front and back). Strips mixed into the outermost paper layer are exposed on the outermost paper layer surface or are ubiquitous inside the outermost paper layer, but are ubiquitous inside because the thickness of the paper layer is thin. However, the brilliant color of the strip is clearly visible from the surface of the paper. In the present invention, it is also possible to apply starch, polyvinyl alcohol, various surface sizes, etc. to the paper surface during the paper making process using a size press device or the like.
Further, if necessary, a machine calendering treatment or a super calendering treatment is performed to appropriately improve the surface smoothness.

The glittering pieces having the same hue or different colors may be used in combination, or strips having the same hue but varying the tone may be used.

The anti-counterfeit paper of the present invention can be used in combination with other anti-counterfeit means. For example, it is transparent, mixed with dyed fibers, mixed with a substance that emits fluorescent color, and threaded. Thereby, the forgery prevention effect can be further enhanced.

As described above, the forgery prevention paper of the present invention is manufactured. This sheet is printed in a predetermined manner and cut as needed to produce securities, tickets, and the like. Even if this is copied by a color copying machine, the bright color of the strip mixed in the paper is not reproduced, so that it is possible to immediately determine whether or not the piece is forged.

[0028]

【Example】

Manufacture of strips Composition 1 Metal aluminum is vacuum-deposited on a 25 μm thick PVA film having a hot water dissolution temperature of 80 ° C. by 500 angstrom, and a yellow dye (trade name: Oleosol First Yellow, manufactured by Sumitomo Chemical Co., Ltd.) is alkali A coating material was added (15 parts by weight) to 100 parts by weight of the soluble nitrocellulose-based resin, and a coating (dry thickness) having a thickness of 3 μm was applied. Then, a circular strip having a diameter of 1 mm was produced using a punching machine.

Structure 2 A film having a thickness of 12 μm and having a hot water dissolving temperature of 80 ° C. and a transfer foil having an interference color (rainbow transfer foil) are passed between hot rolls and bonded, and after cooling, the base of the transfer foil is used. Some polyester films were removed. Then, a circular strip having a diameter of 1 mm was produced using a punching machine.

Composition 3 A pearl pigment emitting red iris on both sides of a high-quality paper having a basis weight of 35 g / m 2 (trade name “Merlin Raster Pigments, Highlight Super Red 9430Z”, manufactured by Marl Corporation) 100 Parts by weight, polyvinyl alcohol with hot water dissolution temperature of about 60 ° C (manufactured by Kuraray Co., Ltd.)
Using a 200 parts by weight coating material, an air knife coater was used to apply 7 g / m2 on each side to produce a pearl pigment coated paper. A pearl pigment coated paper having the same other formulation was manufactured using a pearl pigment emitting green iris color (trade name “Marlin Raster Pigments, Highlight Super Green 18430Z”, manufactured by Marl Corporation). Using these two types of coated paper, a 1 mm × 1.5 mm rectangle was punched using a punching machine, and mixed by the same amount to produce a strip.

Example 1 350 ml of 20 parts by weight of NBKP and 80 parts by weight of LBKP
C. S. F. 10 parts by weight of clay, 0.3 parts by weight of a paper strength agent (trade name "Polystron 191", manufactured by Arakawa Chemical Industry Co., Ltd.), a sizing agent (trade name "Size Pine E", Arakawa 1.0 part by weight (manufactured by Chemical Industry Co., Ltd.) and an appropriate amount of a sulfuric acid band were added to prepare a stock. The strips of the above-mentioned constitution 1 were mixed into the stock using a two-layer papermaking machine of a circular net-circular net, and the first layer was made into a paper having a basis weight of 30 g / m2. For the second layer, paper was made at a basis weight of 80 g / m2 without mixing of small pieces, and thereafter, papermaking was performed according to a conventional method to produce a forgery prevention paper. Drying was performed with a multi-cylinder cylinder dryer. The anti-counterfeit paper thus obtained contained an average of 1,400 strips per m 2, and the bright color was clearly visible from the surface of the paper. When this paper was copied with a color copier (trade name “Cannon Pixel”), the metal color of the strip (in this case, gold or silver) was not reproduced, and the difference between the two (the original and the copy) was judged by visual inspection. Was clearly recognized. Stripping did not occur even after the offset printing. 5 parts by weight of the paper thus prepared, 95 parts by weight of water (that is, pulp concentration of 5%) and 0.1 part by weight of caustic soda were charged into a high-concentration pulper and rotated while blowing live steam to raise the temperature to 60 ° C. As a result, the base film, the vapor-deposited layer, and the resin-coated layer constituting the strip were completely dissolved.
The remaining dye was refined and completely dispersed in the pulp, and no effect was observed even when paper was made using the recovered pulp.

Example 2 An anti-counterfeit paper was produced in the same manner as in Example 1 except that the strips of Structure 2 were used. The obtained anti-counterfeit paper was mixed with an average of 1000 pieces per 1 m 2, and the bright color was clearly visible from the paper surface. When this paper was copied with a color copier (trade name “Cannon Pixel”),
The bright interference color of the strip (in this case red, orange, yellow,
(Green, blue, indigo, purple) were not reproduced, and the difference between the two (manuscript and copy) was clearly recognized by visual judgment. Also, stripping did not occur even after offset printing. The paper was treated in the same manner as in Example 1, but the papermaking pulp could be easily collected.

Example 3 An anti-counterfeit paper was manufactured in the same manner as in Example 1 except that the strips of Structure 3 were used. The obtained anti-counterfeit paper was mixed with an average of 1500 strips per square meter, and the glittering color was clearly visible from the paper surface. When this paper was copied with a color copier (trade name “Cannon Pixel”),
The brilliant pearlescent colors of the strips (in this case, red and green iris colors) were not reproduced, and the difference between the two (the original and the copy) was clearly recognized by visual judgment. Also, stripping did not occur even after offset printing. The paper was treated in the same manner as in Example 1, but the papermaking pulp could be easily collected.

[0034]

As described above, the anti-counterfeit paper of the present invention is manufactured and has remarkable effects as described below. 1) Even if copying is attempted with a color copier, the glitter color of the glittering strips contained in the outermost paper layer cannot be reproduced.
It is possible to immediately determine whether or not it is forged.
In particular, strips using pearl pigments have the advantage that they do not cause discomfort due to being mixed. 2) Since the strips are firmly bonded to the papermaking fibers constituting the paper, there is no problem that the strips fall off during printing. 3) It is possible to manufacture strips that can easily recover papermaking fibers from waste paper and waste paper. 4) Taking advantage of such characteristics, the anti-counterfeit paper of the present invention is suitably used for check paper, stock paper, bond paper, bill paper, gift certificate paper, passport paper, various ticket papers, ticket, and the like.

[Brief description of the drawings]

FIG. 1 is a partially enlarged sectional view of a forgery prevention sheet of the present invention.

[Explanation of symbols]

 Reference Signs List 1 paper layer 2 outermost paper layer 3 glittering strip

Claims (6)

(57) [Claims] Claims: 1. A glittering strip comprising two or more layers of laminated paper, the outermost paper layer of which is 20 to 50 g / m ² , and which has the ability to adhere to paper in the papermaking process. In the forgery prevention paper, the strip has a hot water dissolution temperature of 6
A metal vapor-deposited layer is formed on one side of the film at 0 to 80 ° C., a coating layer composed of a resin and a colorant is formed on the metal vapor-deposited layer as necessary, and a hot water dissolution temperature of 60 to 80 is formed on the surface. ° C
Anti-counterfeit paper, characterized in that it is made by laminating films of the above. 2. A glittering strip comprising two or more layers of laminated paper, the outermost paper layer of which is 20 to 50 g / m ² , and which has a performance capable of adhering to paper in the papermaking process. In the forgery prevention paper, the strip has a hot water dissolution temperature of 6
A transfer foil having an iris color or metallic luster is transferred to a film having a temperature of 0 to 80 ° C., and the hot water dissolution temperature is 6
An anti-counterfeit paper comprising a laminated film of 0 to 80 ° C. 3. A glittering strip comprising two or more layers of laminated paper, the outermost paper layer having a thickness of 20 to 50 g / m ² and having a performance capable of adhering to paper in the papermaking process. The forgery-preventing paper according to claim 1, wherein the strips are formed by applying a coating liquid obtained by mixing a hot water-soluble binder to a metal powder or a pearl pigment onto the paper. 4. A glittering strip comprising at least two layers of laminated paper, the outermost paper layer having a thickness of 20 to 50 g / m ² , and having a performance capable of adhering to paper in the papermaking process. In anti-counterfeit paper, the strips are coated with a coating liquid obtained by mixing a binder with metal powder or pearl pigment,
Then, a forgery prevention paper characterized in that a hot water soluble film is laminated on both sides. 5. A glittering strip comprising two or more layers of laminated paper, the outermost paper layer having a thickness of 20 to 50 g / m ² , and having a performance capable of adhering to paper in the papermaking process. Wherein the strips are made of a film having a hot water dissolving temperature of 60 to 80 ° C. into which a metal powder or a pearl pigment has been kneaded. 6. The anti-counterfeit paper according to claim 3, wherein the pearl pigment is a pearl pigment emitting an iris color.