JP6103215B2 - Anti-counterfeit paper - Google Patents

Description

  The present invention relates to the prevention of counterfeiting of securities such as banknotes, stock certificates, bonds, gift certificates, lotteries and the like, and more specifically, when an attempt is made to counterfeit or tamper with an electronic copying machine. The present invention relates to anti-counterfeit paper that is extremely difficult.

  Currently, paper is widely used as securities having a monetary value such as banknotes, stock certificates, bonds, gift certificates, lotteries, and the like. The paper used for such securities can be watermarked on the paper itself, so that it cannot be easily counterfeited or altered, or a security thread can be inserted into the paper layer, or micro characters or intaglio, Perform special printing of hidden characters, etc., print with special ink that emits visible light when irradiated with wavelengths other than visible light such as ultraviolet rays and infrared rays (Patent Document 1), or copy the print with an electronic copying machine And a special pattern in which characters or images appear to be copied on the printed pattern after copying (Patent Document 2), a metallic foil such as gold foil or silver foil, or light interference Foil that has a diffractive structure such as a hologram or diffraction grating that can express a stereoscopic image or a special decorative image is transferred or sealed, and is further partially broken to prevent peeling. Structure and the transfer foil or decal (Patent Document 3), etc. are used.

  Among these, as the security thread, a light reflection layer having a metallic luster and a printing layer laminated on a thread base material, or the light reflection layer having the metallic luster was partially removed to provide a pattern. And those having a hologram or a diffractive structure on a thread substrate (Patent Document 4).

Japanese Patent No. 5067029 Japanese Patent No. 4701730 Japanese Patent No. 3684653 Japanese Patent No. 4680023

  However, the anti-counterfeit paper of Patent Document 1 requires a special light source and a verification device for irradiating light with a wavelength other than visible light at the festival of authenticity determination, and ordinary people perform authenticity determination on the spot. Have the problem of not being able to.

  Further, the anti-counterfeit paper of Patent Document 2 is a forgery prevention technique that assumes copying by an electronic copying apparatus, and has a problem that it does not support copying by a method other than the electronic copying apparatus.

  Furthermore, the anti-counterfeit paper of Patent Document 3 is produced by transferring or sticking anti-counterfeit foil or a seal to the paper, and when a physical re-peeling is attempted, a sufficient effect can be obtained. There is a problem that the effect is not sufficient for the method of melting the adhesive layer.

  Further, even the anti-counterfeit paper of Patent Document 4 has a problem that the security thread is reused by dissolving the adhesive layer with a solvent or the like.

  The present invention has been made in view of the above circumstances, prevents unauthorized tampering and reuse by a solvent, can easily detect fraud without using a special device, and is difficult to forge or tamper. The purpose is to provide anti-counterfeit paper.

  The invention according to claim 1 of the present application is such that a thread having a functional layer provided on one side of a thread base and an adhesive layer provided on the other side is inserted into the paper base. When the functional layer is immersed in a specific organic solvent, a difference in optical change of 10% or more in visible light transmittance or reflectance is generated in the immersed portion in the process of volatilization of the solvent. It is characterized by anti-counterfeit paper having an irregular optical speckle pattern.

  The invention according to claim 2 of the present application is the anti-counterfeit paper according to claim 1, wherein the specific organic solvent is at least one selected from acetone, methyl ethyl ketone, ethyl acetate, ethyl alcohol, benzene, toluene, and perchloroethylene. It is characterized by including.

  The invention according to claim 3 of the present application is characterized in that in the anti-counterfeit paper according to claim 1 or 2, the functional layer is composed of two or more mixed resin materials.

  In the invention according to claim 4 of the present application, in the anti-counterfeit paper according to claim 3, when the resin composition ratio of the functional layer composed of two or more kinds of mixed resin materials is changed, it is mixed and dissolved or dispersed in the organic solvent. The solution changes from a compatible state to an incompatible state, or from an incompatible state to a compatible state.

  The invention according to claim 5 of the present application is characterized in that in the anti-counterfeit paper according to claims 1 to 4, the material constituting the functional layer includes at least a cellulose derivative resin.

  The invention according to claim 6 of the present application is characterized in that in the anti-counterfeit paper according to claims 1 to 5, the functional layer is a single layer.

  The invention according to claim 7 of the present application is the anti-counterfeit paper according to any one of claims 1 to 6, wherein an optical reflective layer is provided through an intermediate layer that is in contact with the functional layer or has visible light transparency. It is characterized by having.

  The invention according to claim 8 of the present application is characterized in that in the anti-counterfeit paper according to claims 1 to 7, a thread is provided so that at least a part of the functional layer is exposed from the paper base material. To do.

  The invention according to claim 9 of the present application is characterized in that in the anti-counterfeit paper according to claims 1 to 8, the functional layer is coated with a material that dissolves or permeates the organic solvent.

  That is, according to the invention according to claim 1 of the present application, when the thread inserted into the paper base material is immersed in an organic solvent, the thread volatilizes the solvent. The difference in optical change of 10% or more in the reflectance or reflectance occurs, and this becomes an irregular mottled pattern and appears in the functional layer. Therefore, it is possible to easily detect unauthorized tampering with the solvent and to reuse the thread. It can be prevented.

  According to the invention of claim 2 of the present application, the specific organic solvent contains at least one selected from acetone, methyl ethyl ketone, ethyl acetate, ethyl alcohol, benzene, toluene, and perchloroethylene, so that the detection function for the specific solvent is provided. You can have it.

  According to the invention of claim 3 of the present application, the functional layer can be easily manufactured by configuring the functional layer with two or more kinds of mixed resin materials.

  According to the invention of claim 4 of the present application, when the resin composition ratio of the functional layer composed of two or more kinds of mixed resin materials changes, the solution is not dissolved from the compatible state when mixed and dissolved or dispersed in the organic solvent. In order to change from a compatible state or an incompatible state to a compatible state, a functional layer can be produced more easily.

  According to the invention of claim 5 of the present application, the functional layer can be more easily produced because the material constituting the functional layer contains at least a cellulose derivative resin.

  According to the sixth aspect of the present invention, since the functional layer is a single layer, the functional layer can be thinned and the thread can be thinned.

  According to the invention of claim 7 of the present application, a mottled pattern that appears after immersion in a solvent can be easily obtained by providing an optical reflective layer through an intermediate layer that is in contact with a functional layer or has visible light transparency. You can observe.

  According to the invention of claim 8 of the present application, since the thread is provided so that at least a part of the functional layer is exposed from the paper base material, when the anti-counterfeit paper is immersed in the solvent, the solvent functions easily. Since it soaks into the layer, the mottled pattern appears in a short time, and the mottled pattern developed in the functional layer can be directly observed.

  According to the invention of claim 9 of the present application, since the functional layer is provided in a state of being coated with a material that dissolves or permeates the organic solvent, the functional layer is exposed from the paper substrate. The friction resistance of the thread can be improved.

  According to the present invention, when dipped in a solvent, a mottled pattern appears on the thread encased in the paper substrate, so that dipping in an organic solvent can be easily detected, and tampering and reuse of the thread are prevented. It is possible to provide forgery prevention paper that can be printed.

It is the figure which showed the surface side of the forgery prevention paper which concerns on one embodiment of this invention. It is the figure which showed the thread | sled in the B area | region of FIG. 1 in cross section. It is the figure which showed AA of FIG. 1 in cross section. It is the figure which showed the state which immersed the forgery prevention paper which concerns on one embodiment of this invention in the organic solvent, and observed the front side through the paper base material in the mottled pattern which appeared on the thread | sled. It is the figure which showed an example of the resin material applied to the forgery prevention paper which concerns on one embodiment of this invention. It is the figure which carried out the cross section and showed the thread | sled used for the forgery prevention paper which concerns on other embodiment of this invention. It is the figure which showed the surface side of the forgery prevention paper which stuffed the thread | sled of FIG. It is the figure which showed CC in FIG. 7 in cross section. It is the figure which showed the thread | sled in the D area | region of FIG. 7 in cross section. It is the figure which was used for the forgery prevention paper which concerns on other embodiment of this invention, and showed the cross section of the thread | sled.

Hereinafter, a forgery prevention sheet according to an embodiment of the present invention will be described in detail with reference to FIGS.

  In the drawings, the minimum necessary configuration and materials are shown, and the configuration according to the present invention is not limited to this. For example, a configuration in which a layer having a diffraction structure or a hologram is provided or an IC chip inlet is incorporated. Etc. are also possible.

  FIG. 1 shows one surface constituting, for example, the front side of an anti-counterfeit paper 10 according to the present invention, and a thread 4 is formed by being wound into a paper base material 5. As shown in FIG. 2, the thread 4 includes a functional layer 1, a thread base material 2, and an adhesive layer 3. In the thread 4, the functional layer 1 is provided on one surface on the thread base material 2, and the adhesive layer 3 is provided on the other surface of the thread base material 2.

  Then, the thread 4 is rolled into the paper base 5 as shown in FIG. 3 to form the forgery prevention paper 10 shown in FIG. However, although the functional layer 1 is not exposed from the paper base material 5, the thickness of the paper base material 5 is substantially the same in the portion where the thread 4 is inserted and the portion where the thread 4 is not inserted. Therefore, the thickness of the paper base 5 covering the functional layer 1 is reduced, and the functional layer 1 of the thread 4 can be observed through the paper base 5.

  Here, it is preferable that the functional layer 1 has a structure in which the state of the thread base material 2 can be visually confirmed through the functional layer 1. However, depending on the purpose and application of the present invention, the functional layer 1 is not visible light-impermeable. It is also possible to use a material having For example, when the functional layer 1 has visible light permeability, in FIG. 2, the thread base material 2 located on the back side of the functional layer 1 can be visually observed through the functional layer 1, but the functional layer 1 is not visible light. When it has permeability, the thread substrate 2 is hidden behind the functional layer 1 and cannot be observed.

  With the above configuration, when the anti-counterfeit paper 10 is immersed in a specific organic solvent, a mottled pattern is developed as shown in FIG. FIG. 4 shows that the mottled pattern 6 appears on the functional layer 1 on the thread 4 inserted into the anti-counterfeit paper 10 and can be observed even through the paper base material 5.

  The mottle pattern 6 appears on the functional layer 1 in the process in which the anti-counterfeit paper 10 shown in FIGS. 1 and 3 is immersed in a specific organic solvent and the solvent volatilizes. The organic solvent that generates the mottled pattern 6 is selected in advance as an organic solvent that is supposed to be used by forgery or tampering, and the functional layer 1 is constituted by a resin material that generates the mottled pattern 6 with the selected organic solvent. The

  In the present invention, the mottled pattern 6 is a state in which an opaque portion is mixed in an irregular floating island shape in a transparent surface layer portion, or a transparent portion is mixed in an irregular floating island shape in an opaque surface layer portion. It means the state that is.

  These irregular floating island-like opaque portions or transparent portions are each subjected to an optical change that causes a difference of 10% or more in transmittance or reflectance as compared to the state before immersion in the solvent. Also, the number and size of these islands occur irregularly.

  When the thread 4 inserted into the anti-counterfeit paper 10 immersed in the organic solvent is observed from the surface, a mottled pattern 6 is generated on the thread 4 as shown in FIG. Since it consists of a transparent part and an opaque part with a difference of 10% or more in the rate or reflectance, it can be visually observed even through the paper substrate 5.

  As an example, the resin material is, for example, two kinds of mixed resin materials constituting the functional layer 1 as shown in FIG. 5, and the resin composition ratio when mixed and dissolved or dispersed in a mixed solution of methyl ethyl ketone and toluene. The resin materials that change from the compatible state to the incompatible state, or from the incompatible state to the compatible state, are combined by the change in.

  Here, the material shown in FIG. 5 is an example of a combination of resin materials used in the present invention. The present invention is not limited to these, and other resin materials can be used as the functional layer 1.

  For example, when considering a combination of acrylic (BR-75) and cellulose acetate butyrate (CAB), when the resin composition ratio of cellulose acetate butyrate (CAB) is 10%, 30% or 50%, However, when it is 70%, it is x (not compatible). By using such a combination of resins, the functional layer 1 of the thread used for the forgery prevention paper described in the present invention can be obtained more easily.

  Further, the present invention is not limited to the above-described embodiment, and the forgery prevention paper 11 shown in FIG. 7 may be formed by inserting the thread 9 shown in FIG. The thread 9 is provided with a printing layer 7 and a functional layer 1 on a thread base material 2, and an optical reflection layer 8 and an adhesive layer 3 on the opposite surface. The print layer 5 is partially provided on the thread base material 2. The functional layer 1 and the thread base material 2 have visible light permeability, and when viewed from the functional layer 1 side, the printed layer 5 and the optical reflective layer 8 can be observed.

  The thread 9 is rolled into the paper base 5 so that the printed layer 7 and the functional layer 1 are on the surface, and the thread 9 inserted is partially separated from the paper base 5 as shown in FIG. Exposed. For this reason, in the anti-counterfeit paper 11, a part of the printing layer 7 and the functional layer 1 provided on the surface of the thread 9 can be directly observed. In the present configuration, since the printing layer 7 is provided in this configuration, characters (10000 ○ ◎) by the printing layer 7 can be observed, and the functional layer 1 and the thread base material 2 are transparent in portions other than the printing layer 7. Therefore, the reflected light from the optical reflection layer 6 can be observed.

  The thread 9 only needs to be partially exposed from the paper base material 5, and the shape, size, location, cross-sectional shape, and the like of the exposed portion are limited to those shown in FIGS. It is not a thing.

  With the above configuration, when the anti-counterfeit paper 11 is immersed in a solvent, the thread 9 has a function expressed as shown in FIG. When the thread 9 is observed in this state, the mottle pattern 6 has a difference in optical change of 10% or more in terms of visible light reflectance as compared with the part where the mottle pattern 6 does not appear. A portion of (◎) is hidden by the mottled pattern 6 and is difficult to observe.

  As a result, the appearance of the mottled pattern 6 causes a clear change in the appearance of the thread 9 in the anti-counterfeit paper 11 as compared to before the solvent immersion, and the change can be visually observed.

  Furthermore, the present invention is not limited to the above embodiment, and for example, the thread 13 may be configured as shown in FIG. The thread 13 includes a coating layer 12, a functional layer 1, a printing layer 7, a thread base material 2, an optical reflection layer 8, and an adhesive layer 3, and the printing layer 7 is partially provided. The thread 13 has a configuration in which a coating layer 12 is additionally provided on the functional layer 1 side of the thread 9 in FIG.

  The coating layer 12 is made of a material that dissolves or permeates a specific organic solvent that causes the mottle pattern 6 on the functional layer 1. By providing the coating layer 12, it is possible to improve physical properties such as surface weather resistance and friction resistance of the thread 13 according to the purpose and application while maintaining the function for the specific organic solvent according to the present invention. Become.

  Next, each layer will be described in detail.

(Functional layer)
For the functional layer 1, a material having visible light permeability is selected, and in the process of immersing in a specific organic solvent and volatilization of the solvent, the surface of the immersion region has a visible light transmittance or reflectance relative to that before immersion. It is a layer having a function of expressing a mottled pattern 6 having a difference in optical change of 10% or more.

  Specific organic solvents are selected that are supposed to be used by counterfeiting or tampering. For example, acetone, methyl ethyl ketone, ethyl acetate, which are easily available in normal life and frequently used in various daily necessities, are used. It is preferable to contain at least one selected from ethyl alcohol, benzene, toluene, perchloroethylene and the like.

  Furthermore, when two or more kinds of mixed resin materials are used as the material constituting the functional layer 1, the functional layer 1 can be easily produced.

  In addition, when these two or more types of mixed resin materials are mixed and dissolved or dispersed in a specific organic solvent selected in advance, depending on the change in the resin composition ratio, the compatible state is changed to the incompatible state or the incompatible state. By using a combination of resin materials that change from a compatible state to a compatible state, it can be more easily produced. An example of such a combination of resin materials is shown in FIG. 5 as described above.

  Specifically, the materials used for the functional layer 1 are ○ (compatible), Δ (partially compatible), and × (not compatible) in the combination of resins shown in FIG. A mixed resin having a resin composition ratio at the boundary is preferable. For example, in the case of a combination of acrylic (BR-75) and cellulose acetate butyrate (CAB), a resin composition ratio of BR-75: CAB = 50%: 50% or BR-75: CAB = 30%: 70% is preferable. . By using such a resin composition ratio, it is possible to obtain the functional layer 1 in which the mottled pattern 6 is more easily developed.

  In the present invention, “compatible” means that a mixed resin solution dissolved or dispersed in a solvent or a solid obtained by drying the mixed resin solution has a change in transparency compared to before mixing. Refers to no state.

  The visual turbidity method is simple and reliable for determining whether the mixed or dissolved resin is compatible or incompatible. For example, the resin before mixing dissolved or dispersed in a solvent is transparent and the resin solution after mixing is transparent, or the resin solution after mixing is dried to produce a film sample, and the film If the sample is transparent, it is determined that the sample is compatible. In the case of visual observation, the size of the wavelength of visible light (about 500 nm) is regarded as the minimum unit. Therefore, in the case of being transparent, it can be said that the concentration and composition are uniform, that is, compatible above the visible light wavelength. On the other hand, when the mixed solution or the mixed dry solid is opaque, the concentration and composition are non-uniform, and the cause of non-uniformity is that two different polymers are incompatible.

  Further, in order to further facilitate the effect of developing the mottled pattern 6 of the functional layer 1, it is preferable to design the dissolution rate of each of the plurality of resin materials in a specific organic solvent to be greatly different. By designing in this way, the functional layer 1 adjusted to a resin blending ratio that becomes a boundary between the compatible state and the incompatible state is immersed in a specific organic solvent, and in the process of volatilization of the solvent, Therefore, the balance of the resin ratio is lost, and it becomes easy to change to an incompatible state or a compatible state.

When adjusting the dissolution rate in a specific organic solvent, it is preferable to refer to the average molecular weight, crystallinity, polarity, and solubility parameter of each resin material.
In general, a resin material having a high average molecular weight has a low dissolution rate, and a resin material having a low average molecular weight has a high dissolution rate. For example, in the case of a chain polymer resin, the longer the molecular chain (the higher the average molecular weight), the greater the attractive force between the polymer molecules, and the more difficult it is to disentangle the molecular chains by the solvent molecules and disperse them. In addition, the attractive force between polymer molecules increases as the surface where the polymer molecules contact each other is larger, that is, as the polymer molecule orientation is ordered (crystalline). Therefore, the chain polymer is less soluble in the solvent as the average molecular weight (degree of polymerization) is larger and the crystallinity ratio is larger.

  Another factor that determines the solubility of the resin material is affinity with solvent molecules. For example, polar polymers tend to dissolve easily in polar solvents, but tend to be less soluble in nonpolar solvents, and nonpolar polymers tend to the opposite. A factor for determining the strength of the affinity is a solubility parameter (SP value) δ. This δ value is expressed by the following formula. In principle, the closer the δ value of the polymer and the solvent molecule, the higher the solubility.

δ ² = ΔE / V (1)
ΔE is the evaporation energy, V is the molar volume. As the main δ value of the resin material in the formula (1), vinyl acetate (9.1), polymethyl methacrylate (9.2), vinyl chloride (9.3), acetic acid Vinyl (9.4), nitrocellulose (10.1), methacrylate resin (10.7), cellulose acetate (11), cellulose diacetate (11.4), polystyrene (8.6 to 9.7), etc. It is shown in known literature. Further, as main δ values of the solvent, cyclohexane (8.2), butyl acetate (8.5), toluene (8.9), ethyl acetate (9.1), methyl ethyl ketone (9.3), tetrahydrofuran (9 .5), acetone (10), ethyl alcohol (12.7), water (23.4) and the like are shown in known literatures.

  For example, if it is desired to increase the dissolution rate in the solvent A, a resin material having a dissolution parameter close to that of the solvent A may be selected. Conversely, if the dissolution rate in the solvent A is to be decreased, it has a different dissolution parameter from that of the solvent A. A resin material may be selected.

  As a material used for the functional layer 1, for example, a general thermoplastic resin such as polyethylene, acrylic, polyester, cellulose derivative, vinyl chloride, and vinyl acetate can be used. In particular, when it is configured to include at least a cellulose derivative resin material such as nitrocellulose or cellulose acetate butyrate, it can be produced relatively easily.

  As a method for applying the functional layer 1, a known printing method such as gravure printing, flexographic printing, screen printing, or offset printing can be used.

(Thread substrate)
The thread base material 2 is provided to support the functional layer 1.

  The material used for the thread substrate 2 is preferably a plastic film substrate. For example, PET (polyethylene terephthalate), PEN (polyethylene naphthalate), PP (polypropylene), and the like can be used, but it is desirable to use a material that is less deformed or altered by heat or pressure applied when the functional layer 1 is provided. . However, paper, synthetic paper, plastic multilayer paper, resin-impregnated paper, or the like may be used as the thread base material 2 depending on applications and purposes.

  Although not shown in the drawing, the thread base material 2 is not necessarily provided so as to be in contact with the functional layer 1, and an intermediate layer or the like may be provided between the base material 2 and the functional layer 1.

(Print layer)
The print layer 7 is a layer on which a certain pattern such as an arbitrary character or a pattern is provided on the entire surface or a part thereof, and can be formed by a known printing method such as offset printing, gravure printing, or screen printing.

  Moreover, as the printing layer 7, you may use the functional ink from which a color changes according to an illumination angle or an observation angle. Examples of such functional inks include optically variable ink, color shift ink, and pearl ink.

  Alternatively, the printing layer 7 may be formed using toner. In this case, for example, a toner is prepared in which colored particles such as graphite and pigment are adhered to plastic particles having charging properties. Then, the printed layer 7 is formed by transferring the toner to the base material by using static electricity due to charging, and heating and fixing the toner.

  In addition, a diffractive structure forming layer or a holographic image forming layer may be provided as the printing layer 7 to give information or optical change by diffracted light or a hologram image.

(Optical reflection layer)
The optical reflection layer 8 is provided so that the mottle pattern 6 due to an optical change with a difference of 10% or more in the visible light transmittance or the visible light reflectance of the functional layer 1 can be easily observed. Examples of the material used include materials having a high refractive index such as TiO2, Si2O3, SiO, Fe2O3, and ZnS, and metal materials such as Al, Sn, Cr, Ni, Cu, and Au having a high light reflection effect. The film thickness is preferably 10 to 500 nm, and a known thin film forming method such as a vacuum deposition method or a sputtering method can be used.

  The optical reflection layer 8 may be provided on the entire surface, or may be partially provided in the shape of characters, pictures, and the like. In this case, the design property is improved and the processing becomes more complicated, so that a higher forgery prevention effect can be imparted.

  As a method of partially providing the optical reflection layer 8, the optical reflection layer 8 is provided after the soluble resin is partially formed, and the soluble resin and the optical reflection layer 8 in the portion are washed and removed. A method, a method in which a metal thin film layer is used as the optical reflection layer 8, and the metal thin film layer is partially provided with an acid-resistant or alkali-resistant resin, and then the metal thin film is etched with acid or alkali, or light is exposed. For example, a resin material that dissolves or hardly dissolves is applied and exposed through a mask having a desired pattern, and then unnecessary portions are removed by washing or etching. In addition, such a method is an example and this invention is not limited to these, A well-known technique can be utilized suitably.

(Adhesive layer)
The adhesive layer 3 is provided to fix the thread inserted into the paper base material 5 to the paper base material 5. As the main material, polyester resin, urethane resin, acrylic resin, vinyl chloride resin, vinyl chloride / vinyl acetate copolymer resin, polyvinyl alcohol resin, or the like is preferably used. As a method for providing the adhesive layer 3, a known printing method such as a gravure printing method or a screen printing method is appropriately used.

(Coating layer)
The coating layer 12 is a layer provided to protect the functional layer 1 from physicochemical damage and the like while maintaining the function of the functional layer 1 with respect to a specific organic solvent.

  The material used for the coating layer 12 needs to have a property of being dissolved or permeated in a specific organic solvent selected in advance. For example, when the specific organic solvent is a methyl ethyl ketone / toluene mixed solvent, examples of the material that can be selected as the coating layer 12 include acrylic and cellulose acetate butyrate that can be dissolved or permeated with the methyl ethyl ketone / toluene mixed solvent.

  The functional layer 12 can adjust the physical strength and the surface friction coefficient by adding an additive such as filler or wax according to the required function.

  As described above, each layer constituting the anti-counterfeit paper according to the present invention has been described in detail. However, each layer is colored to further improve the design, or the optical reflection layer 8 is formed into a multilayer interference film layer by forming a multilayer structure. Good.

  Specific examples will be described below in detail based on the embodiments of the present invention.

Example 1
The thread 4 is rolled into the paper base material 5 to produce the forgery prevention paper 10.

First, as the thread base material 2, a 12 μm thick transparent polyethylene terephthalate (PET) film is used, and ink composed of the following composition is printed and dried on the one side so as to have a thickness of 2 μm by a gravure printing method. Layer 1 was provided. Then, an adhesive layer 7 is formed on the entire opposite surface of the thread base 2 with an ink composed of the following composition so as to have a thickness of 10 μm by a gravure printing method. The thread 4 was produced by slitting the strip. Next, as a material of the paper base 5 in the forgery prevention paper 10, a paper material made of the following composition was beaten in water to form a slurry (liquid paper material), which was a slurry having a concentration of 1.5%. Next, a straw net was set in a hand mill, and half of the usual amount of slurry was poured into the net and dehydrated once, and the thread 9 was placed at a desired position. Here, a half of the usual amount of slurry is poured into a net and dehydrated, dried naturally for 1 hour, and then completely dried with a hot air dryer at 90 ° C. for 10 minutes, whereby a basis weight of 100 g / m ^{2 is obtained.} 1 was prepared.

"Functional layer ink composition"
Acrylic resin (BR-75) 5 parts Cellulose acetate butyrate (CAB) 5 parts Methyl ethyl ketone 45 parts Toluene 45 parts “Adhesive layer ink composition”
Polyester adhesive 40 parts Ethyl acetate 60 parts "Paper substrate composition"
Softwood pulp 89 parts Filler (white pigment) 10 parts Sizing agent (rosin) 0.5 part Size fixing agent (sulfuric acid band)
The anti-counterfeit paper of Example 1 produced in this way was an anti-counterfeit paper in which a thread was wound in appearance, and the thread was firmly adhered and could not be removed. In addition, it is possible to print characters and images on anti-counterfeit paper. When this anti-counterfeit paper is immersed in a 1: 1 mixture of methyl ethyl ketone and toluene for 10 seconds and then naturally dried at room temperature, anti-counterfeiting is possible. Since a white mottled pattern was generated on the plain thread squeezed into the paper, it was possible to visually confirm the trace of the anti-counterfeit paper immersed in a specific solvent as a mottled pattern.

(Example 2)
An anti-counterfeit paper 11 in which the thread 9 is wound into the paper base material 5 in a window opening shape is produced.

  As the thread substrate 2, a transparent polyethylene terephthalate (PET) film having a thickness of 12 μm is used, and black characters composed of “10000” and “◯ ◎” characters are printed on one side of the film by the screen printing method. Was continuously provided and dried in an oven at 50 ° C. for 3 hours to obtain a printed layer 7.

Next, the functional layer 1 is laminated on the entire surface of the thread substrate 2 on the same surface as the printing layer 7 by printing and drying an ink composed of the following composition to a thickness of 2 μm by a gravure printing method. . And after forming aluminum with a film thickness of 50 nm as the optical reflecting layer 8 on the opposite surface of the thread base material 2 by a vacuum deposition method, an ink composed of the following composition is further used as the adhesive layer 7 by a gravure printing method. A thread original fabric was prepared by providing the entire surface so as to have a thickness of 10 μm, and further slitting into a strip shape having a width of 7 mm to produce a thread 9. Next, as a material of the paper base material 5 in the forgery prevention paper 11, a paper material made of the following composition was beaten in water to form a slurry (liquid paper material), which was a slurry having a concentration of 1.5%. Next, a window-opening screen was set in a hand-working device, a half of the usual amount of slurry was poured into the screen and dehydrated once, and the thread 9 was placed in the window opening. Here, a half of the usual amount of slurry is poured into a purse net, dehydrated, naturally dried for 1 hour, and then completely dried with a hot air dryer at 90 ° C. for 10 minutes, so that the basis weight is 100 g / m ² . An anti-counterfeit paper 11 was produced.

"Print layer ink composition"
Polymer methacrylic (PMMA) resin 15 parts Low-viscosity nitrocellulose 45 parts Black pigment (carbon black) 5 parts Cyclohexanone 35 parts "Functional layer ink composition"
Acrylic resin (BR-75) 5 parts Cellulose acetate butyrate (CAB) 5 parts Methyl ethyl ketone 45 parts Toluene 45 parts “Adhesive layer ink composition”
Polyester adhesive 40 parts Ethyl acetate 60 parts "Paper substrate composition"
Softwood pulp 89 parts Filler (white pigment) 10 parts Sizing agent (rosin) 0.5 part Size fixing agent (sulfuric acid band) 0.5 part The anti-counterfeit paper of Example 2 produced in this way is a window whose paper base is a thread. It is exposed from the opening, and the letters “10000” and “○ ◎”, which are the print layers of the thread, can be clearly observed from the exposed part, and this thread is firmly attached to the paper substrate. , Could not be extracted from the paper substrate.

  In addition, when this anti-counterfeit paper was immersed in a 1: 1 mixture of methyl ethyl ketone and toluene for 10 seconds and then naturally dried at room temperature, a white mottled pattern was generated on the thread that had been poured into the anti-counterfeit paper. The letters “10000” and “○ ◎” on the printed layer are hidden in this white mottled pattern, making it difficult to read, and it is possible to visually check the trace of this anti-counterfeit paper immersed in a specific solvent. there were.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention in the implementation stage. Furthermore, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements.

  For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, the problems described in the column of problems to be solved by the invention can be solved, and the effects described in the effects of the invention can be obtained. In some cases, a configuration from which this configuration requirement is deleted can be extracted as an invention.

  According to the present invention, it is possible to provide a label capable of preventing and detecting unauthorized tampering and reuse by an organic solvent. By attaching this label to a necessary item, it is possible to prevent forgery or falsification of securities, branded products, certificates, personal authentication media, etc., and to add a function of proving authenticity.

DESCRIPTION OF SYMBOLS 1 ... Functional layer 2 ... Thread base material 3 ... Adhesive layer 4, 9 ... Thread 5 ... Paper base material 6 ... Mottled pattern 7 ... Print layer 8 ... Light reflection layer 10, 11 ... Anti-counterfeit paper 12 ... Cover layer

Claims (9)

  An adhesive layer is provided on one surface of a thread base material, and a thread having a functional layer on the other surface is inserted into a paper base material, and the functional layer is immersed in an organic solvent. An anti-counterfeit paper characterized in that in the process of volatilization of the solvent, the dipping portion forms a mottled pattern consisting of an optically changing portion having a visible light transmittance or reflectance difference of 10% or more with respect to that before dipping.   The anti-counterfeit paper according to claim 1, wherein the organic solvent includes at least one selected from acetone, methyl ethyl ketone, ethyl acetate, ethyl alcohol, benzene, toluene, and perchloroethylene.   The anti-counterfeit paper according to claim 1, wherein the functional layer is composed of two or more kinds of mixed resin materials.   When the resin composition ratio of the functional layer composed of the two or more kinds of mixed resin materials is changed, when mixed and dissolved or dispersed in the organic solvent, the solution is in an incompatible state or incompatible state. The anti-counterfeit paper according to claim 3, wherein the anti-counterfeit paper is changed to a compatible state.   The anti-counterfeit paper according to any one of claims 1 to 4, wherein the material constituting the functional layer contains at least a cellulose derivative resin.   The forgery prevention paper according to any one of claims 1 to 5, wherein the functional layer is a single layer.   The anti-counterfeit paper according to any one of claims 1 to 6, wherein an optical reflection layer is provided through an intermediate layer that is in contact with the functional layer or has visible light transparency.   The anti-counterfeit paper according to any one of claims 1 to 7, wherein the functional layer is provided so that at least a part of the functional layer is exposed from the paper base material.   The anti-counterfeit paper according to any one of claims 1 to 8, wherein the functional layer is provided in a state of being coated with a material that dissolves or permeates the organic solvent.

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