JP4595444B2 - Anti-counterfeit paper and anti-counterfeit medium using the same - Google Patents

Description

  The present invention provides an anti-counterfeit paper and a counterfeit-preventing sheet which can be faithfully reproduced even by using a color copier, a color scanner, a computer, a color printer, etc. The present invention relates to an anti-counterfeit medium using

  Conventionally, securities paper having a monetary value such as stock certificates, bonds, gift certificates, lottery tickets, and the like has been widely used as a base material. In order to prevent the securities paper from being easily counterfeited or altered, various measures for preventing forgery are taken, such as watermarking the paper itself or inserting colored fibers. And when using this security paper as securities, the image information required as securities is provided on the securities paper as the base material, and micro characters and hidden characters are provided, intaglio printing, The effect of preventing counterfeiting is further improved by performing special printing such as fluorescent printing, or by transferring or sealing a foil having a metallic luster or a hologram foil.

  Forgery performed on such securities for which various anti-counterfeiting measures have been taken, many use a printing method and a copying method using a color copier or the like. Among these, forgery using an ink-jet color copier is relatively easy to perform, and the resolution and hue of the resulting copy (counterfeit product) are becoming difficult to distinguish from the real product. There is a strong need for anti-counterfeiting measures.

  Also, with the rapid spread of personal computers and color scanners, image information of securities is once captured by a scanner, then edited by a computer and output from a color printer to produce counterfeit products. Counterfeiting is also increasing.

  In this way, with recent improvements in the performance and rapid spread of color copiers, color scanners, personal computers with color printers, etc., there are sophisticated copies that cannot be easily distinguished from the real thing with these tools. In addition, the forgery prevention technology based on pattern printing such as conventional micro characters and hidden characters cannot cope with these forgery acts.

In order to cope with such a situation, forgery using a color copier or a normal printing method, various forgery prevention measures are also applied to the paper itself as a base material for securities. For example, when making paper, fluorescent fibers are used to prevent counterfeiting, and ultraviolet light is irradiated to check for the presence of fluorescent fiber penetration (for example, refer to Patent Document 1). However, such anti-counterfeiting measures require an ultraviolet irradiation device for authenticity determination, or when not irradiating ultraviolet light, it is difficult to determine authenticity, and paper that contains general fibers. There is a problem that it is difficult to distinguish from counterfeiting performed using.
JP 11-93096 A

The present invention has been made paying attention to the problems as described above, and prevents the use of a color copier, a color scanner, a computer, etc. so that faithful reproduction cannot be performed, and the use of a special instrument for authenticity determination. Without forgery, counterfeiting, falsification, tampering and other counterfeiting papers, and securities such as gift certificates, lottery tickets, admission tickets, and anti-counterfeiting stickers, etc. It is an object to provide a forgery prevention medium.

In order to achieve the above object, the invention according to claim 1 has at least a laminated portion in which two or more types of polymer thin films having different refractive indexes are sequentially laminated, and an outer layer covering the laminated portion. Thus, the composite fiber exhibiting iris properties is inserted so as to be located at least on the surface portion, and the composite fiber absorbs the light transmitted through the laminated portion, thereby further increasing the iris color exhibited by the composite fiber. The anti-counterfeit paper is characterized in that a light-absorbing layer showing vividly is sandwiched and laminated between the middle layers of the laminated portion.

  The invention according to claim 2 is a composite that has at least a laminated portion in which two or more types of polymer thin films having different refractive indexes are sequentially laminated and an outer layer that covers the laminated portion, and exhibits iris properties. The fiber is squeezed so as to be located at least on the surface portion, and the composite fiber absorbs light transmitted through the laminated portion, so that one fiber together with the fiber that shows the iris color exhibited by the composite fiber more vividly This is a forgery-preventing paper characterized by being knitted into a yarn shape.

Furthermore, the invention according to claim 3, wherein the composite fiber is a forgery preventing paper according to claim 1 or 2, characterized in that it curled or crimped.

Furthermore, an invention according to claim 4 is a forgery prevention medium, wherein an image is provided on the forgery prevention paper according to any one of claims 1 to 3 .

  The anti-counterfeit paper according to the present invention and the anti-counterfeit medium using the anti-counterfeiting medium have composite fibers exhibiting iris properties in part, so that the composite fibers located on the surface change color by changing the viewing angle. Therefore, even if a paper similar to the anti-counterfeit paper of the present invention (counterfeit product) is made by mixing fibers of the same hue, the color change cannot be reproduced on the paper. It becomes easy to do. In addition, the composite fiber that is encased is not a colored fiber, but is a fiber that exhibits iris properties due to the interference of light, so when copied, the interference color cannot be reproduced, making it impossible to forge by copying. .

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

  FIG. 1 is an explanatory view showing a cross-sectional configuration of the anti-counterfeit paper of the present invention, FIG. 2 is a plan view showing the anti-counterfeit medium of the present invention, and FIG. 3 shows an XX in the anti-counterfeit medium shown in FIG. It is explanatory drawing which shows the structure of the cross section by a line. Each of FIGS. 4 to 7 is an explanatory perspective view of an end surface portion showing the configuration of the composite fiber.

  As shown in FIG. 1, the anti-counterfeit paper of the present invention has at least a laminated portion in which two or more kinds of polymer thin films having different refractive indexes are sequentially laminated in layers, and is a composite fiber 2 exhibiting iris properties. Is placed at least on the surface portion. In addition, as shown in FIGS. 2 and 3, the forgery prevention medium of the present invention is a medium (such as a gift certificate, lottery ticket, admission ticket, etc.) on a part of the forgery prevention paper 5 having the structure shown in FIG. Image (product description information, lottery number, issuing company name, decorative pattern, etc.) 6 required as a kind or anti-counterfeit sticker).

The composite fibers 2 and 4 encased in the anti-counterfeit paper 1 and the anti-counterfeit medium 3 have at least a laminated portion formed by sequentially laminating two or more polymer thin films having different refractive indexes. The hue changes according to the viewing angle. The composite fiber 10 exhibiting iris properties shown in FIG. 4 has a plurality of laminated portions in which two types of polymer thin films 11 and 12 having different refractive indexes are sequentially laminated, and the iris properties shown in FIG. The composite fiber 20 exhibiting the above is formed by laminating a plurality of laminated portions in which three kinds of polymer thin films 21, 22, and 23 having different refractive indexes are sequentially laminated.

  As described above, these laminated portions are portions in which two or more types of polymer thin films having different refractive indexes are sequentially laminated. From a variety of high refractive index polymer thin films and low refractive index polymer thin films, At least one kind from a polymer thin film having a refractive index and at least one kind from a polymer thin film having a low refractive index, and sequentially laminating them at a predetermined thickness to obtain a specific absorption or reflection characteristic for visible light of a specific wavelength. This is the part shown. Therefore, this portion changes to various hues depending on the viewing angle.

  Examples of the polymer film having a high refractive index include polyethylene naphthol (1.63 = refractive index n: the same applies hereinafter), polycarbonate (1.59), polystyrene (1.59), polyethylene telenaphthol (1.58), and the like. As a polymer film having a low refractive index, nylon (1.53), polymethyl methacrylate (1.49), polymethylpentene (1.46), fluorine-type polymethyl methacrylate (1.4 Specific examples include thin films made of polymers such as

  The configuration of the composite fiber to be wound into the paper is not limited to the above-described one, and may be as shown in FIGS. 6 and 7. That is, the composite fiber 30 shown in FIG. 6 has a light absorption layer 34 that can absorb light transmitted through the laminated portion in which the polymer thin films 31 and 32 are sequentially laminated, and is laminated between the inner layer portions of the laminated portion. It is what. In addition, the composite fiber 40 shown in FIG. 7 is provided with a light absorption layer 44 that can absorb light transmitted through a laminated portion in which polymer thin films 41, 42, and 43 are sequentially laminated, further laminated on the outer layer portion. It is what has been.

  These light absorption layers 34 and 44 are provided in order to further emphasize the optical characteristics of the laminated portion in which the polymer thin films are sequentially laminated. In other words, the composite fiber exhibiting iris properties transmits a specific wavelength by combining the refractive index and the film thickness of each polymer thin film of the laminated portion constituting a part thereof to a predetermined value. The reflected light is reflected to exhibit an iris color, but the transmitted light is absorbed by a portion of the light absorption layer laminated as shown in FIGS. Make the coloring look clearer and make the hue change (color shift) due to the difference in viewing angle more vivid.

  Therefore, this light absorption layer is only required to be able to absorb the wavelength of light transmitted through the laminated portion of the composite fiber exhibiting iris properties, and there is no limitation on the hue thereof, but generally it is set to black or dark color. As described above, the light absorption layer may be provided on the inner layer portion of the composite fiber or may be provided by being laminated on the outer layer portion. This is preferable because the composite fiber shows an iris color clearly from any angle.

  In addition, the composite fiber exhibiting iris properties, such as the composite fiber structure shown in FIG. 8, has a characteristic capable of absorbing light transmitted through the laminated portions of the polymer thin films of the composite fiber 46 that are alternately laminated. These fibers 45 may be knitted together, or the fibers themselves may be curled or crimped. Various methods such as twisting and weaving can be adopted as a method of weaving the composite fiber and other fibers, and the form is not particularly limited, and the optical properties of the composite fiber exhibiting iris can be emphasized. As long as it is woven.

  As shown in FIGS. 1 to 3, these composite fibers and composite fiber structures are preferably exposed on the surface of the paper because the effect of iris becomes higher. In addition, it is preferable to curl or crimp the composite fiber because it is easy to distinguish it from a counterfeit product.

  The anti-counterfeit paper of the present invention in which the composite fiber having the above-described structure is encased can be obtained by a paper making method using ordinary plant fiber paper. That is, paper fibers such as plant fibers made of wood pulp such as conifers, hardwoods, bagasse, hemp, flax, kenaf and the like are beaten in water, and then the composite fibers having the above-described configuration are further entangled to obtain a raw material concentration of 0.5. It is made by kneading so that it becomes 10%, preferably about 1-2%, and then pouring on a stale / reticulated wire, etc., squeezing water, evaporating the water by heating, and making it stick. .

  The length of each fiber is not particularly limited, but specifically, it may be about 3 to 6 mm. In particular, if the average fiber length of the composite fiber is too short, it is difficult to visually recognize a color change due to light interference in this portion, so care must be taken. For papermaking, clay, talc, calcium carbonate, titanium dioxide, etc. as fillers, rosin, alkyl ketene dimer, stearic anhydride, etc. as sizing agents, and modified starch, polyvinyl alcohol as paper strength enhancers Polyacrylamide or the like may be added as appropriate.

  Hereinafter, the present invention will be further described with specific examples.

350 ml of NBKP, LBKP S. Beated by F, and as shown below, white clay, paper strength enhancer (trade name “Polystron 191” manufactured by Arakawa Chemical Industries, Ltd., sizing agent (trade name “Sazupine E” manufactured by Arakawa Chemical Industries, Ltd.) Then, an appropriate amount of a pH adjusting agent was added to adjust the paper stock.
[Composition of paper stock]
Softwood bleached kraft pulp (NBKP) 20 parts by weight Hardwood bleached kraft pulp (LBKP) 80 parts by weight White clay 10 parts by weight Paper strength enhancer 0.3 part by weight Size agent 1 part by weight pH adjuster Next, adjust as described above To the paper stock, a laminated part made up of a nylon thin film and a polyethylene terephthalate thin film is laminated, and a composite fiber (average fiber length 3 to 6 mm) exhibiting iris is added. Using the paper layer, the paper layer was made to have a basis weight of 90 g / m ² to obtain a forgery-preventing paper according to the present invention. Next, a desired image was printed on the anti-counterfeit paper with process ink to obtain an anti-counterfeit medium.

  The obtained anti-counterfeit paper and anti-counterfeit medium had composite fibers randomly arranged on their surface portions, and the color change of the composite fibers could be visually recognized only by changing the angle without using a special instrument. . In addition, since this color change is obtained by light interference, when copying with a color copier using the obtained anti-counterfeit paper and anti-counterfeit medium as a manuscript, color change due to light interference on the copy It was not possible to reproduce the above, and was found to be effective against counterfeiting by copying.

It is explanatory drawing which shows the structure of the cross section of the forgery prevention paper of this invention. It is a top view which shows the forgery prevention medium of this invention. FIG. 3 is an explanatory diagram illustrating a configuration of a cross-sectional portion taken along line X-X ′ of the forgery prevention medium illustrated in FIG. 2. It is a perspective explanatory view showing the section composition in the end of the composite fiber which constitutes a part of the present invention. It is an isometric view explanatory drawing which shows the cross-sectional structure in the edge part of the other composite fiber which comprises a part of this invention. It is a perspective explanatory view showing the section composition in the end of the other conjugate fiber which constitutes a part of the present invention. It is a perspective explanatory view showing the section composition in the end of the other conjugate fiber which constitutes a part of the present invention. It is explanatory drawing which shows the state of the composite fiber structure formed by a composite fiber and another fiber being knitted together.

Explanation of symbols

1, 5, .. Anti-counterfeit paper 2, 4, 10, 20, 40, 46 .. Composite fiber 3 .. Anti-counterfeit medium 6 .. Images 11, 12, 21, 22, 23, 31, 32, 41, 42 , 43, ... Polymer thin films 34, 44, ... Light absorption layer 45, ... Fiber

Claims (4)

It has at least a laminated portion in which two or more types of polymer thin films having different refractive indexes are sequentially laminated and an outer layer covering the laminated portion, and a black or dark color light absorption layer is formed in the middle layer of the laminated portion. sandwiched are laminated, composite fibers exhibiting iris resistance, anti-falsification paper which is characterized by being plowed to be positioned on at least a surface portion. The composite fiber that has at least a laminated portion in which two or more types of polymer thin films having different refractive indexes are sequentially laminated, and an outer layer that covers the laminated portion, and has an iris property is a black or dark other fiber. anti-falsification paper which one composite fiber structure woven with a thread-like, characterized in that they are plowed to be positioned on at least the surface portion with.   The anti-counterfeit paper according to claim 1, wherein the composite fiber is curled or crimped.   An anti-counterfeit medium, wherein an image is provided on the anti-counterfeit paper according to claim 1.

Images