JPH08311800A - Paper for preventing forgery - Google Patents

Abstract

PURPOSE: To produce a paper for preventing forgery capable of only giving a copied or a duplicated material having a completely different color tone from a manuscript (original) in spite of trying to copy by using a color copying machine or to duplicate by using an image processing system. CONSTITUTION: This paper for preventing forgery is constituted by >=2 layers of paper layers, the paper layer of the outer most part having an open window part 2, a belt like material 4 having a pearly gloss inserted between the paper layer located at the outermost part and the paper layer laying under it, so as to expose the belt like material 4 at the open window part 2. Since the belt like material 4 consisting of a coated material is obtained by applying the coating liquid prepared by blending a pearly pigment with a hot water soluble binder to firmly adhere the paper layers, the slipping off of the belt like material from the paper layers on printing is not likely to occur, and also receiving fibers for paper making from waste papers become possible.

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 an anti-counterfeit paper in which only a copy or a copy having a color tone completely different from that of the original (genuine) can be obtained even if an attempt is made to copy by a color copying machine or copy by an image processing system.

[0002]

2. Description of the Related Art Recently, the accuracy of copying machines has been remarkably improved, and in particular, the spread of electrophotographic color copying machines has facilitated the forgery of various securities and has become a social problem. To prevent this, various anti-counterfeiting measures have been considered. One of them is that the present copying machines cannot reproduce a glittering material such as metallic color or interference color. There is something.

For example, as proposed in Japanese Utility Model Laid-Open No. 58-168754, a copy is prepared by providing a bright plate such as aluminum foil having a remarkable metal color tone on the upper surface of a base paper and providing a letter pattern on the surface of the bright plate. There is a proposal for non-copyable paper by machine.
When this is copied, the character pattern applied to the paper surface becomes unreadable because the foil surface is blackened when the light is emitted from the copying machine. This paper has the advantage that copying itself is impossible (the copy cannot be read), but the disadvantage is that the metallic color is overemphasized because of the large area occupied by the bright printing paper, which is uncomfortable. Further, there are other problems such that the manufacturing process of the paper becomes complicated, the cost is inevitably increased, and it is difficult to collect the papermaking fibers from the waste paper.

The present inventors have conducted investigations with the objective of solving these problems. The inventors of the present invention have changed their minds and noticed that even if a color copying machine is used for copying, it is possible to judge whether the original is copied in a hue different from that of the original, or if it is not copied at all, it is genuine. .

The inventors of the present invention first divided a silver-colored aluminum vapor-deposited polyester film having excellent glitter into pieces,
We considered making it into paper. Since the metallic luster cannot be reproduced by the color copying machine in the paper manufactured in this way, the area where the strips are mixed is simply copied in black, which proves that the paper has anti-counterfeiting ability. However, it has been found that in the paper manufactured in this manner, the strip does not firmly adhere to the paper, and the strip comes off during printing, which causes a serious problem.

The present inventors have proposed a forgery-preventing paper that solves the above problems as Japanese Patent Application No. 5-317396. The gist of the present invention is to provide an anti-counterfeit paper in which glittering strips are unevenly distributed in the flow direction of the base paper on the surface of the base paper, and the strips can be adhered to the base paper in the papermaking process. It is an anti-counterfeit paper which has various performances.

[0007]

In order to produce this anti-counterfeit paper, a method of sprinkling strips on a web on a Fourdrinier paper machine or a cylinder paper machine, immediately before slicing of the fourdrinier paper machine or Immediately after that, a paper material containing strips or water is blown out in a streak shape from several points in the width direction, or a method is used in which strips are sprinkled on a wet paper immediately before a press roll. By doing so, the strips are unevenly distributed near the surface of the base paper. That is, the strips are exposed on the surface of the base paper, and the other part is sunk into the vicinity of the surface and becomes unevenly distributed near the surface.

As a result of further study by the present inventors, the use of the strip having pearl luster causes the metal-specific glare when unevenly distributed on the surface of the paper, as compared with the case where the strip having the metallic luster is used. It was found that they have no discomfort and have a gentle pearly luster, and also have excellent anti-counterfeiting ability. It is inevitable that the strips are distributed with a certain width on the paper by the method of sprinkling the strips in a streak pattern. For example, 10
It is very difficult to manufacture such that it is distributed below the width of mm. This imposes restrictions on the design when a predetermined item is printed on the surface of the paper later. It is an object of the present invention to solve this drawback and develop anti-counterfeit paper having the same effect by other means.

[0009]

The present invention comprises two or more paper layers, the outermost paper layer having a window opening, and the outermost paper layer and the lower paper layer. The anti-counterfeit paper is characterized in that a strip having pearl luster is inserted between the paper layers, and the strip is exposed at the window opening.

Next, the present invention will be described with reference to the drawings. FIG.
Is a top view of an example of the anti-counterfeit paper of the present invention, and FIG. 2 is a partially enlarged sectional view thereof. Reference numeral 1 denotes a paper layer located on the outermost side, which has a window opening portion 2 and has a pearly strip 4 between the paper layer 1 located on the outermost side and the paper layer 3 located therebelow. Is inserted, and the strip is exposed at the window opening. The window opening is a small rectangle in this example, and when this paper is viewed under room lighting, for example, rectangular spots having a pearly luster appear on the surface of the paper in a row. The term "exposed" as used in the present invention means that the entire window opening is covered with the belt-shaped material or that it occupies a part thereof.

An example of a method for producing a strip having a pearl luster will be described. 1) A synthetic resin film is coated with a coating liquid containing a pearl pigment and a binder, and then a strip is produced using a slitter or the like. 2) A dense nonwoven fabric, for example, a spunbonded nonwoven fabric, is coated with a coating liquid containing a pearl pigment and a binder, and then a slitter or the like is used to produce a strip. 3) A pearl pigment is mixed with a synthetic resin and melt-extruded to form a film. Further, a synthetic resin is dissolved in a solvent, and a pearl pigment is mixed with this to form a film. After that, a strip-shaped material is manufactured using a slitter or the like. 4) A base paper mainly made from paper pulp is coated with a coating solution containing a pearl pigment and a binder, and then a slitter or the like is used to produce a strip.

In the present invention, considering the recovery of papermaking pulp from broke, the base paper produced mainly from the papermaking pulp described in 4) above is coated with a coating solution comprising a pearl pigment and a binder, and then a slitter or the like is applied. Preference is given to using the strips produced using. At this time, a transparent resin layer may be used to form a surface coating layer on the coating layer coated with a coating liquid comprising a pearl pigment and a binder, or the surface coating layer may be appropriately formed.

As a result of the study conducted by the present inventors, it was found that the durability of the slitter blade used in the production of the belt-like material can be dramatically improved by using the polyolefin synthetic pulp together in the papermaking process. The present inventors have made detailed studies and found that the effect is obtained when 2 to 30 parts by weight of a polyolefin-based synthetic pulp is used in combination with 98 to 70 parts by weight of papermaking pulp (absolute dry weight part, hereinafter the same). It turned out to be big. In this case, the durability of the blade is improved 10 to several tens of times as compared with the case where the polyolefin synthetic pulp is not added.

As the pearl pigment used in the present invention, any of known pearl pigments such as natural pearl essence, mica powder, titanium oxide-coated mica powder, basic carbonate and fish scale foil can be used. These manufacturing methods and the like are described in JP-B-35-5367, JP-B-39-28885, JP-B-48-23179, JP-B-47-29569, and JP-B-53-47375.
JP-B-56-39669, JP-B-58-7674,
JP-B-1-22873, JP-B-4-48812, JP-A-58-174449 and JP-A-58-180561.
JP-A-58-219226 and JP-A-59-782.
No. 65, JP-A-60-92359, and JP-A-62-34.
962, JP-A-62-285956, JP-A-4-2.
Any of the techniques described in No. 27666, etc. can be used. Some pearl pigments emit an iris color, and their characteristic is that the hue changes 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 using a plurality of strips that emit different iris colors, the anti-counterfeiting ability is enhanced and the design effect is enhanced.

Examples of the binder include synthetic rubber latex such as styrene / butadiene copolymer latex and methyl methacrylate / butadiene copolymer latex, synthetic resin emulsion such as polyacrylic acid ester emulsion and polyvinyl acetate emulsion, starch, casein, polyvinyl alcohol and the like. The natural sizing agent or the synthetic sizing agent can be used.

In the present invention, it is preferable to use a binder that is insoluble in cold water but soluble in hot water as the binder. A preferred example of the binder having such properties is polyvinyl alcohol. Polyvinyl alcohol can be synthesized by changing the degree of polymerization and the degree of saponification, and the melting temperature in water can be changed. As will be described in detail later, the band-shaped material produced by using such a binder does not elute the binder from the band-shaped material in the wet part of the papermaking process, and the swelling or a part thereof is eluted by the heat of the dry part, and then the When dried, it has a property of firmly adhering to the paper layer. This is a preferable property when it is used for offset printing. That is, strips and paper layers are not peeled off from the blanket during offset printing. In the present invention, it is particularly preferable to use a binder that is soluble in hot water at 60 to 80 ° C., since it has high water resistance to cold water (is difficult to elute in water) and high adhesiveness to a paper layer.

To prepare a coating liquid, pearl pigment 100 is usually used.
80 to 300 parts by weight of the binder is mixed with the parts by weight. At this time, auxiliary materials such as an antifoaming agent, an antiseptic agent, an antifungal agent, and a viscosity adjusting agent can be appropriately mixed so long as they do not hinder the present invention. The coating liquid prepared in this manner usually has a basis weight of 10 to 10.
Coating amount of 2 on 60g / m2 (absolute dry basis, same below) base paper
It is applied at 10 to 10 g / m2, preferably 3 to 5 g / m2.
It is preferable that the base paper is as excellent in surface smoothness as possible in order to give the pearlescent pigment a bright feeling. One example is a white pigment-coated paper excellent in water resistance, but the results of studies by the present inventors show that the paper of the present invention is not provided with a pigment coating layer, for example, fine paper can sufficiently achieve the object of the present invention. confirmed. The base paper is preferably sized so as to prevent penetration of the coating liquid, and also preferably has wet water resistance.

The pearl pigment coating layer is provided by using a known coating machine such as an air knife coater or a roll coater, a gravure printing machine or a screen printing machine. The coating is applied to one side or both sides. At this time, coating liquids that emit different iris colors were prepared, and coating was performed using a printing machine so that the hues would change one after another in a striped pattern. It begins to emit an iris color. The anti-counterfeit paper manufactured by using this can further enhance the anti-counterfeit ability. Further, the anti-counterfeiting ability is further improved by applying a dot coating layer of various shapes by a printing means instead of the stripe shape.

There is an inverse correlation between the strength of pearl luster and the adhesive strength with the paper layer. The pearl luster can be increased by increasing the ratio of the pearl pigment, but then the ratio of the binder is inevitably decreased and the adhesive strength to the paper layer is weakened. The present inventors have made the following conclusions as a result of investigating a method for simultaneously enhancing the conflicting performances. That is, in order to further improve the pearl luster and the adhesiveness to the paper layer, 85 to 50 parts by weight of a pearl pigment and 15 to 50 parts by weight of a binder insoluble in cold water and soluble in hot water are mainly used. A pearl pigment coating layer is provided, and a surface coating layer made of a binder which is insoluble in cold water but soluble in hot water is further provided thereon. As this binder, it is particularly preferable to use a binder that is soluble in hot water at 60 to 80 ° C., since polyvinyl alcohol has high water resistance to cold water and high adhesiveness to the paper layer, and polyvinyl alcohol is a suitable example thereof.

In the present invention, the base paper coated with the pearl pigment may be used in combination with a fluorescent coloring agent which emits a fluorescent color by ultraviolet rays. It is also possible to use a fluorescent coloring agent that emits a fluorescent color with ultraviolet rays together with the pearl pigment coating liquid. In these cases, it is preferable that the base paper is not used together with a fluorescent coloring agent that emits a fluorescent color. By doing so, the band-shaped material emits a fluorescent color when it is irradiated with ultraviolet rays, but when viewed under an ordinary light source, the appearance is almost the same as when the fluorescent coloring agent is not used together. By doing so, the anti-counterfeit performance of the paper can be further enhanced. By irradiating the paper with ultraviolet rays, the band-shaped material emits a fluorescent color, and the authenticity can be easily determined.

As the fluorescent coloring agent, fluorescein,
Coumarin-based, oxazole-based, pyrazoline-based, thiadiazole-based, spiropyran-based, pyrenesulfonic acid-based, benzimidazole-based, diaminostilbene-based fluorescent dyes, and sulfide-based or oxide-based inorganic fluorescence such as zinc sulfide / copper active pigment Any of the agents can be used.

The pearl pigment-coated paper thus produced is used in a microslitting machine and usually has a width of 1 to 15 m.
Slit with a width of m, preferably 3 to 5 mm to produce a band-shaped product, which is wound on a bobbin.

Next, an example of a method for manufacturing the anti-counterfeit paper of the present invention will be described. The anti-counterfeit paper of the present invention includes softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), softwood bleached sulfite pulp (NBS).
P), thermo-mechanical pulp (TMP) and other paper-making pulp as a main component, on which a dry paper strength enhancer, a wet paper strength enhancer, a sizing agent, a fixing agent, a retention improver, a drainage improver,
An antifoaming agent, a dye, a coloring pigment, a fluorescent agent, etc. are used in combination as appropriate, and usually a freeness of 550 to 250 ml C. S. F. Papermaking is carried out using a multi-tank cylinder paper machine capable of papermaking with two or more layers.

For example, in the first tank of a two-tank structure cylinder paper machine, the upper net of the cylinder cylinder is worked to close the mesh of the portion corresponding to the window opening of the paper. This work is performed, for example, by partially coating a resin on the upper net, laminating a resin plate having a predetermined shape, laminating a metal plate, or the like. For the second tank, use a net on a cylinder cylinder without any work. The paper layer (wet paper) formed in the first tank is transferred to a blanket, and the paper layer formed in the second tank is overlaid and kneaded. At this time, the strip-shaped material is drawn out and inserted between the paper layer formed in the first tank and the paper layer formed in the second tank. At this time, it is necessary that the strip-shaped material is drawn out to the window opening portion. . In the present invention, a combination of a cylinder paper machine and a Fourdrinier paper machine or a Fourdrinier paper machine can be adopted for paper production. In the present invention, it is also possible to apply starch, polyvinyl alcohol, various surface sizes, and the like on the paper surface during the papermaking process with a size press device or the like.

The paper web thus formed is dried by being heated in a drying zone of a paper machine such as a cylinder dryer or a Yankee dryer. In the early stage of drying, the web contains a large amount of water.Therefore, when a binder that is soluble in hot water is used in the coating layer of the strip, the binder swells or a small part of it dissolves and is dried in the drying zone. By doing so, it firmly adheres to the paper layer. Subsequently, in order to impart surface smoothness to the paper, a machine calendering treatment or a super calendering treatment is appropriately performed to manufacture the anti-counterfeit paper of the present invention.

As the strips, several kinds of strips having the same hue or different hues may be used in combination, and strips having the same hue but different tones may be inserted. It is also possible to freely insert a plurality of these strip-shaped materials next to each other in the window opening portion at the same time, or to insert them into window opening portions provided at different positions. In addition, it is possible to freely insert a band-shaped material that is wider than the width of the window opening, or to insert a band-shaped material that is narrower than the width of the window opening.

In the present invention, the portion corresponding to the window opening has a small amount of papermaking fibers. Therefore, when the window opening has a width wider than that of the belt-like material, that portion is not visible when the paper is seen through. It looks bright compared to the surroundings. This effect is similar to the so-called "white watermark" effect, and the present invention can positively utilize this to further enhance the forgery prevention effect. This is an example in which the strip 4 is inserted into the window opening 2 (in this example, the lion pattern in this example) formed in a pattern as shown in FIG. 3 by the printing means. Similar effects can be obtained by forming characters instead of patterns.

In the present invention, the outermost paper layer is the window opening, and the strip having pearl luster is inserted between the paper layers located below the window opening. Thus, the anti-counterfeit paper having the sectional structure shown in FIG. 4 can be manufactured. This example is an example in which the band-like material is exposed at the window opening portions formed on the front surface and the back surface of the paper.

Further, as shown in FIG. 5, it is possible to manufacture an anti-counterfeit paper in which the strip-shaped material looks like a single strip by continuously providing the window opening.

The anti-counterfeit paper of the present invention is manufactured by the method as described above. After that, predetermined printing is performed to produce securities and the like. It is preferable to employ a design in which printing is not performed on the strip-shaped portion having pearly luster, but pearlescence is recognized even when the ink is applied to the strip-shaped portion. It is more difficult to confirm the existence of the band-shaped material as compared with the case where the ink is not applied. Even if an attempt is made to counterfeit the securities produced in this way using a color copier, the pearl luster of the strip is not reproduced, and the copy shows a strip that appears darker than the surroundings when seen through the light beam. Since it doesn't exist, you can immediately check whether it is genuine or not.

It was written as an example of a strip, but needs reexamination.

【Example】

Example 1 of production of band-shaped material 350 parts of 20 parts by weight of bleached softwood kraft pulp (NBKP) and 80 parts by weight of bleached hardwood kraft pulp (LBKP)
lC.S. F. It was beaten to a paper strength enhancer (trade name "Polystron 191", manufactured by Arakawa Chemical Industry Co., Ltd.) 0.3
Parts by weight, sizing agent (trade name "Size Pine E" manufactured by Arakawa Chemical Industry Co., Ltd.) 1.0 part by weight, and an appropriate amount of sulfuric acid band are added to prepare a paper stock, and a gauze weight of 35 g / A m2 base paper was produced. On both sides of this base paper, 85 parts by weight of a red iris-colored pearl pigment (trade name "Marine Raster Pigments, Highlight Super Red 9430Z", manufactured by Marl Corporation), hot water soluble temperature 6
A 20% by weight aqueous paint consisting of 15 parts by weight of PVA (manufactured by Kuraray Co., Ltd.) at 0 ° C. was applied by an air knife coater at a rate of 2 g / m 2 per side to form a pearl pigment coating layer. Further, a coating consisting of a 7 wt% aqueous solution of PVA (the same) was applied on both sides by 2 g / m 2 on each side using an air knife coater to form a surface coating layer. Then
A strip having a width of 3 mm was manufactured using a micro slitter and wound on a bobbin.

Production Example 2 of Strip-shaped Material A coating material for a pearl pigment coating layer was added with 50 parts by weight of pearl pigment and PVA.
The same strip as in Production Example 1 was produced except that the amount was 50 parts by weight, the coating amount was 5 g / m 2, and the coating amount of the surface coating layer was 5 g / m 2.

Production Example 3 of band-shaped material PBK used in the base paper is NBKP 19 parts by weight, LBKP
79 parts by weight, polyethylene-based synthetic pulp (trade name "S
WP ", manufactured by Mitsui Petrochemical Industry Co., Ltd.) 2 parts by weight,
A strip was produced in the same manner as in Production Example 1 except that the coating amount of the pearl pigment coating layer was 5 g / m 2 and the coating amount of the surface coating layer was 5 g / m 2.

Production Example 4 of Band-like Material Pulp used for base paper is 20 parts by weight of NBKP, LBKP
The same strip as in Production Example 2 was produced except that 40 parts by weight, 40 parts by weight of polyethylene-based synthetic pulp (the same) were used, and the coating amount of the pearl pigment coating layer was 2 g / m 2.

Production Example 5 of Strip A strip identical to that of Production Example 4 was produced except that the surface coating layer was not provided.

Example 1 Manufacture of anti-counterfeit paper: 350 parts of 20 parts by weight of NBKP and 80 parts by weight of LBKP
C. S. F. Beaten to 10 parts by weight of clay, 0.3 parts by weight of paper strengthening agent (trade name "Polystron 191", manufactured by Arakawa Chemical Industry Co., Ltd.), sizing agent (trade name "Size Pine E", Arakawa A chemical was prepared by adding 1.0 part by weight of Chemical Industry Co., Ltd. and an appropriate amount of a sulfuric acid band. An anti-counterfeit paper was manufactured by using this stock with a cylinder two-tank paper machine. The width of the paper making net attached to the cylinder cylinder located in the first tank is 5 m
m 20 mm long rectangular resin plate with adhesive 1
The paper nets were continuously attached at 5 mm intervals so that the short sides of the rectangle were parallel to the flow direction, and the paper making net located in the second tank was a plain net without any work. In the first tank, a paper layer having a basis weight of 40 g / m 2 was formed. At this time, a paper layer was not formed in the portion where the rectangular resin plates were stuck, and the window was opened. Immediately before the first wet paper web transferred to the felt is overlaid with the paper layer having a basis weight of 60 g / m 2 formed from the second paper making net, the strip of Production Example 1 is placed in the middle of the window opening. So inserted. Then, a forgery prevention paper was manufactured through dehydration and drying steps according to a conventional method.

Example 2 An anti-counterfeit paper was produced in the same manner as in Example 1 except that the strip of Production Example 2 was used.

Example 3 An anti-counterfeit paper was manufactured in the same manner as in Example 1 except that the strip of Production Example 3 was used.

Example 4 An anti-counterfeit paper was produced in the same manner as in Example 1 except that the strip of Production Example 4 was used.

Example 5 An anti-counterfeit paper was manufactured in the same manner as in Example 1 except that the strip of Production Example 5 was used.

Table 1 shows the evaluation results of the examples.

[0042]

[Table 1]

The evaluation was carried out by the method described below. The results were evaluated by a 5-point method, 5 points being the best, 1 point being the poorest, and 3 points or more being practically usable. 1) Strength of pearl pigment coating layer: The paper after the papermaking was put on an offset printing machine, and the strip was peeled between the pearl pigment coating layers and evaluated by the amount taken on the blanket. 2) Durability of blade: The durability of the blade when a strip was manufactured by a micro slitter was evaluated. 3) Brightness: Brightness of the strip-like material exposed at the window opening was visually evaluated. 4) Adhesive strength with paper layer: The paper after papermaking was placed on an offset printing machine, and evaluated by the rate at which the belt and the paper layer located on the belt were taken by the blanket.

Further, 5 parts by weight of the example paper, 95 parts by weight of water, and 0.1 parts by weight of caustic soda were charged in a high-concentration pulper and rotated while blowing live steam to raise the temperature to 60 ° C. The material was easily disintegrated and the pulp for papermaking could be easily recovered.

[0045]

As described above, the anti-counterfeit paper of the present invention is manufactured and has the following remarkable advantages. 1) The band-shaped material has excellent luster and has a gentle pearly luster so that it does not give a feeling of strangeness to the paper, and is excellent in design. 2) Even if an attempt was made to make a copy using a color copier or an image processing was used to make a copy using a color printer, the glitter of the band could not be reproduced, and the copy or copy was seen through the light beam. In that case, since there is no band-like object that appears darker than the surroundings, it is possible to immediately confirm whether it is genuine or not. 3) When a belt-shaped material produced by coating a base paper with a coating liquid prepared by mixing a pearl pigment with a binder soluble in hot water is used, the belt-shaped material firmly adheres to the paper layer in the papermaking process. Stripping of strips and paper layers on the blanket is eliminated. 4) A coating layer having a two-layer structure, that is, a structure having a pearl pigment coating layer and a binder layer can simultaneously improve the contradictory performances of glitter and adhesiveness. 5) By using a synthetic polyolefin-based pulp in combination with the base paper for producing the strip, the strip with improved durability of the slitter blade can be produced. 6) When a belt-like material using a base paper mainly composed of papermaking fibers is used, the papermaking fibers can be easily recovered from damaged paper or waste paper. 7) Taking advantage of such characteristics, the anti-counterfeit paper of the present invention can be used for checks, stock certificates, bonds, banknotes, gift certificates, passports,
It can be suitably used for various counterfeit prevention applications such as tickets and boarding tickets, as well as applications requiring design of posters, pamphlets, greeting cards, envelopes, labels and the like.

[Brief description of drawings]

FIG. 1 is a top view of an example of anti-counterfeit paper of the present invention.

FIG. 2 is a partially enlarged sectional view of the anti-counterfeit paper shown in FIG.

FIG. 3 is a top view of another example of the anti-counterfeit paper of the present invention.

FIG. 4 is a partially enlarged sectional view of another example of the anti-counterfeit paper of the present invention.

FIG. 5 is a top view of another example of the anti-counterfeit paper of the present invention.

[Explanation of symbols]

 1 Paper layer located on the outermost side 2 Window opening part 3 Paper layer located under the paper layer located on the outermost side 4 Strip having pearl luster

Front page continuation (72) Inventor Mitsuo Sakano 501 Honjuku, Nagaizumi-cho, Sunto-gun, Shizuoka Special paper manufacturing Co., Ltd. (72) Tatsuya Koike 501, Honjuku, Nagaizumi-cho, Sunto-gun, Shizuoka Special paper (72) Inventor Yoshihiko Fukumuro 501 Honjuku, Nagaizumi-cho, Sunto-gun, Shizuoka Prefectural Paper Manufacturing Co., Ltd.

Claims (8)

[Claims] 1. A paper layer composed of two or more paper layers, the outermost paper layer having a window opening, and a pearly luster between the outermost paper layer and the paper layer below it. A forgery-preventing sheet, in which a belt-like article having a sheet is inserted, and the belt-like article is exposed at the window opening. 2. The forgery prevention according to claim 1, wherein the band-shaped material is formed by coating a base paper with a coating solution in which a pearl pigment is mixed with a binder which is insoluble in cold water but soluble in hot water. Paper. 3. The anti-counterfeit paper according to claim 2, wherein the pearl pigment is a pearl pigment which emits an iris color. 4. A pearl pigment of 85 to 50 parts by weight on both sides of the base paper, and a binder of 15 to 50 insoluble in cold water and soluble in hot water.
The pearl pigment coating layer mainly composed of parts by weight is provided, and a surface coating layer made of a binder that is insoluble in cold water and soluble in hot water is further provided on the pearl pigment coating layer. The anti-counterfeit paper according to 2 or 3. 5. The anti-counterfeit paper according to claim 4, wherein the binder is insoluble in cold water and has a hot water dissolution temperature of 60 to 80 ° C. 6. The anti-counterfeit paper according to claim 4 or 5, wherein the binder is polyvinyl alcohol. 7. The pulp constituting the base paper is a pulp 9 for papermaking.
8 to 70 parts by weight, polyolefin synthetic pulp 2 to 3
The anti-counterfeit paper according to claim 2, wherein the amount is 0 parts by weight. 8. The anti-counterfeit paper according to claim 3, wherein a band-like material provided with a coating layer which has a pearlescent luster of an iris color partially different in the flow direction is inserted.