JP2018176440A - Printed matter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printed matter for preventing falsification capable of easily executing falsification prevention and authenticity determination, and excellent in designability and security dispensing with a transparent film for verification matched with a latent image pattern when the latent image pattern is developed (verification for authenticity determination of securities and the like), and an authenticity determination method.SOLUTION: A printed matter (1) having a printed layer (12) on one or both surface sides of a substrate (11) includes a latent image part (13) composed of a hairline pattern, a verification part (14), and a background part (16) where at least one of the latent image part and the verification part is formed by a material containing ink. The latent image part is developed for the first time by respectively matching the latent image part and the back ground part with the verification part, superposing, and further passing a transmitted beam to observe the latent image part.SELECTED DRAWING: Figure 1

Description

  The present invention is applied to printed matter that requires forgery prevention or copy prevention such as securities vouchers, banknotes, stock vouchers, securities such as bonds, various certificates, valuable documents, etc. The present invention relates to a printed matter having a latent image portion formed of an image pattern and having a verification portion capable of visualizing the latent image pattern.

  In the past, in order to prevent unauthorized use of gift certificates, banknotes, stock certificates, securities such as bonds, various certificates, and valuable documents due to forgery or duplication, sophisticated printing technology etc. have been applied. In addition to these sophisticated printings, special anti-counterfeit measures have come to be taken in view of the frequent occurrence of fraudulent use by counterfeiting and copying in recent years, though it was general.

  As a special anti-counterfeit measure, for example, there is a method of sticking a hologram, a method of applying a color or material to develop a color by ultraviolet light, and performing an authenticity judgment by irradiating ultraviolet light, and further, a latent image with a width of approximately 1 to 1 lines. A line film having a line pattern of the same shape as this line, on a printed matter which is composed of a portion and a non-latent image portion and the phase is shifted by 1/2 pitch in the latent image portion and the non-latent image portion. The non-latent image portion is hidden by the line pattern of the line film, and only the latent image portion appears to be floated up as an image, and the authenticity determination is performed based on the presence or absence of the image of the latent image portion. There is a method using a technique called "line moire method".

  The above-mentioned "line moire method" will be described in more detail. For example, as shown in the front view of FIG. 4, the latent image portion (30) of the character "T" has a line pattern of approximately 1 to 1 in width and pitch. And the other non-latent image portion (32), and as shown in FIG. 5 as a partial enlarged view of the A portion shown in FIG. 4, the latent image portion (30) and the non-latent image portion (32) The line direction of the line pattern is the same direction, and its phase is shifted by 1/2 pitch, and this image is called a line moire image (3), and as shown in the front enlarged view of FIG. When a line film (34) having a line pattern of substantially the same shape (10,000 line width (W) and pitch (P)) is superimposed, the non-latent image portion (32) becomes 10,000 lines of this line film (34). Hidden in the line pattern, as shown in FIG. 7, only the latent image portion (30) appears as an image of the letter "T" It is those that become visible. When this line moiré image (3) is used to prevent forgery, as shown in FIG. 4, for example, a visible triangular image (36) is formed in the vicinity of the latent image portion (30). Since only the visible triangular image (36) is visible in this case, this visible image (36) at first glance seems to be a forgery prevention measure, and the real authenticity judgment is made as shown in FIG. By superposing a line film (34) on this line moire image, as shown in FIG. 7, in addition to the visible image (36), it is performed with or without the latent image portion (30) of the character "T" It is.

  As the above-mentioned technique of “line moire method” is complicated to make it difficult to duplicate, for example, the line of the line portion and the non-ray portion of the line portion of the line portion has different 1: 1 Two or more types of line patterns arranged at line angles are formed, and the phase is shifted by a half pitch with respect to the line patterns in one to several types of line pattern regions of the line patterns. And an image forming body provided with a latent image line pattern of characters, and superimposing the developed image line sheets having the same pitch as the line pattern with each other so that the line angle matches each other. There is one in which a latent image line pattern of characters formed in a line pattern area corresponding to each line angle is visualized at each time (see, for example, Patent Document 1).

  However, a dedicated verifier is required for the above-mentioned "line moire method" authenticity determination. Normally, a retailer, a service provider or a government can prepare a verifier for authenticity judgment and perform authenticity judgment on the assumption of securities, certificates, etc. received from a consumer. However, it is difficult for the general consumer to assume that the verifier has been obtained in advance in consideration of these situations, and the authenticity judgment can not be made.

  Therefore, in order to solve this problem, a flexible support is provided with a latent image device and a verification device on the same surface or different surfaces of the support, and the support is deformed to form a latent image device. There is a forgery-preventing medium that does not use a verifier, in which different images are visualized when the same surface of the support faces and the different surface faces when the verification device is matched. Reference 2).

JP 2001-213042 A JP 2009-139453 A

  As described above, in any of the above-mentioned "line moi methods", when developing a latent image pattern (verification for authenticity judgment of securities etc.), transparent for verification matched with the latent image pattern The film was required separately, and it was necessary to distribute this film for verification to a verification place etc. which performs the verification, and its management was not easy. Furthermore, if there is only one type of verification film distributed, the latent image pattern to be formed on securities etc. and the pitch and line shape etc must be matched accordingly, so that the security including the designability There is also a problem that there are limits, and situations where it can be judged true or false are also limited. In addition to the printed matter, it is expensive to create a filter for verification separately.

  On the other hand, the anti-counterfeit medium of Patent Document 2 solves the problem of separately requiring a verification film, but it is a latent image technique using a polarization technique, and therefore it is costly.

  The present invention is intended to solve the problems of the prior art, and provides a forgery-preventing printed matter and a method for judging the authenticity, which can be easily forged-forgery prevention and authenticity judgment.

  The present invention has been made to solve the above-mentioned problems, and the invention according to claim 1 of the present invention is a printed matter having a printing layer on one or both sides of a substrate, The printed matter includes a latent image portion formed of a line pattern, a background portion, and a verification portion, and at least one of the latent image portion and the verification portion is formed of a material including a watermark ink. Printed matter characterized by

  The invention according to claim 2 of the present invention is the printed matter according to claim 1, wherein at least one of the latent image portion and the verification portion is present in the print layer.

  The invention according to claim 3 of the present invention is the printed matter according to claim 1 or 2, wherein the base material has an opacity of 50% or less of at least a part thereof.

  In the invention according to claim 4 of the present invention, in the latent image portion, the distance between the line portion and the non-line portion of the line pattern is not constant, or the thickness of the line portion of the line pattern The printed matter according to any one of claims 1 to 3, characterized in that

  The invention according to claim 5 of the present invention is the method for judging authenticity using the printed matter according to any one of claims 1 to 4, wherein the latent image portion and the verification portion are obtained by bending or folding the base material. , And a verification step of determining whether or not a latent image exists on the printed matter.

  Since the present invention is configured as described above, the following effects can be obtained.

  That is, according to the invention of claims 1 and 2, the printed matter has a printing layer on one side or both sides of the substrate, and the printed matter is a latent image portion having a line pattern, and a background Part and a verification part, and at least one of the latent image part and the verification part is formed of a material containing a watermark ink, in the case of verification of the linear latent image pattern Since the line latent image pattern and the line pattern for verification are contained in one base material, the line film for verification separately is not required as in the conventional case, and accordingly, the verification place etc. Management of multi-line film becomes easy.

  In addition, since the verification line film is not required, the cost for separately producing the verification line film can be reduced.

  According to the third aspect of the present invention, since the opacity of at least a part of the substrate is 50% or less, the latent image can be visually recognized or mechanically read by the transmitted light.

  According to the invention of the fourth aspect, the distance between the line portion and the non-line portion of the line pattern is not constant, or the thickness of the line portion of the line pattern is not constant. A printed matter having a latent image pattern can be obtained which has an increased degree of freedom in the line shape of the latent image pattern and the pitch thereof, and can enhance security as well as design.

  Further, according to the invention as set forth in the first to fourth aspects, copying at least one of the latent image portion and the verifying portion is made of a material containing a watermark ink, thereby achieving copy reproduction in a copying machine or the like. The printed matter may have a latent image pattern with higher security, which is impossible.

  According to the invention as set forth in the fifth aspect, in the authentication judging method using the printed matter according to any one of the first to fourth aspects, the latent image portion and the verification portion are obtained by bending or folding the base material. As in the prior art, by including a folding step, a transmission step of transmitting the printed matter to light, and a verification step of determining whether a latent image exists on the printed matter, as in the prior art. Because it does not require a line pattern film for verification, it has a latent image pattern that makes verification work and management, etc. easy and reliable in a verification place etc. that performs the verification, and enables verification with excellent security. It can be considered as a method of judging authenticity of a printed matter.

An example of a printed matter concerning the present invention is shown, (a) is a top view and (b) is a sectional side view at the time of cutting at B line part. It is a perspective view which shows an example of the authenticity determination method which visualizes the latent-image part of the printed matter based on this invention, and determines the presence or absence of a latent image. The specific example of the form of a linear linear pattern which comprises the image formation body which has a latent image of this invention is shown, (a) is a linear linear pattern which becomes a straight line, (b) is a straight line. It is a line pattern of dots, and (c) is a line pattern of wavy lines. It is a front view for demonstrating one specific example of the line moire image which comprises the conventional image formation body. It is the elements on larger scale of the A section of the front view of the line moiré image shown in FIG. It is a front enlarged view for demonstrating one specific example which overlap | superposed the line film on the line moire image which has a latent image part. FIG. 7 is a front view showing a specific example in which the latent image portion is visualized and appears floating when the line film is superimposed on the line moire image having the latent image portion.

  One embodiment of the present invention will be described in detail based on FIGS. 1 to 3. However, it is not particularly limited to this.

  FIG. 1 shows one specific example of the printed matter according to the present invention, FIG. 1 (a) is a plan view, FIG. 1 (b) is a side sectional view taken along line B, FIG. 2 is a printed matter according to the present invention It is a perspective view which shows an example of the authenticity determination method which visualizes the latent-image part of these, and determines the presence or absence of a latent image. FIG. 3 is an explanatory view showing another example of the form of a linear pattern forming the latent image portion of the printed matter according to the present invention.

  The printed matter shown in FIG. 1 has a printing layer (12) on a substrate (11), and a latent image portion (13), a background portion (16), and a part of the printing layer consisting of a line pattern. And a verification unit (14). Since each of the latent image portion (13) and the background portion (16) has a line pattern, the boundary can not be determined visually and is visually recognized as a uniform printing area under general illumination conditions . Further, the linear pattern forming the verification section (14) is patterned by a material containing a watermark ink.

  The printed matter (1) of the present invention shown in FIG. 1 is folded back along a central folding line (15) as shown in the perspective view of FIG. 2, and a latent image portion (13) and a background portion (16) By aligning and superposing them with (14) and further observing through the transmitted light (O) from the opposite side, the latent image portion “TOPPAN” is revealed to a visible or machine readable degree. At this time, since the linear pattern forming the verification section (14) is patterned by the material containing the watermark ink, the latent image portion is not realized only by simply superposing and observing, and The latent image portion can be made to appear only by observing the printed matter through transmitted light.

  The folding line is not particularly required. However, it is preferable to provide the folding line because it facilitates the superposition at the time of visualizing. However, since printing is often performed on the surface, it is preferable to use a color that is less noticeable or thinner.

  In the above example, the shape of the substrate is rectangular, and the latent image portion (13) and the background portion (16), and the verification portion (14) are both ends of the long axis of the rectangular as shown in FIG. However, the arrangement of the respective parts and the shape of the base are not limited to this. Further, the base material is not necessarily limited to the flexible base material, and for example, a portion corresponding to the folding line (15) is formed by a hinge and folded to form a latent image portion and a background portion. A non-flexible substrate can also be used as long as it is possible to superimpose on the verification unit.

  The print layer may be formed on both sides of the substrate, in which case the latent image portion and the background portion, and the verification portion may be formed on different surfaces. However, each part needs to be formed at a position where it is possible to easily overlap each other. Furthermore, the latent image portion, the background portion, and the verification portion may be formed at the same level as the other print layers as in the specific example shown in FIG. It is good. That is, under the latent image portion, the background portion, and the formation region of the verification portion, a normal print image of a completely independent design or the like, a color may be formed as a base image or a base color. However, in consideration of the reproducibility of the latent image pattern by the linear latent image pattern and visualizing, it is preferable to avoid colors approximate to the color tone adopted for the latent image pattern because there is a possibility of camouflage. Further, the formation of a normal print image or coloring by completely independent design or the like is not hindered in the region other than the formation region of the above-mentioned line pattern on the base material.

  The number of latent image portions, background portions, and verification portions formed on the substrate is not limited. When a plurality of latent image portions, background portions, and verification portions are provided, the sizes and shapes of the respective linear patterns may be the same or may be different from each other.

  For example, a latent image portion A, a latent image of which the pitches of the line portions and the non-ray portions are 1: 1 and the pitch is the same at three corners of the upper and lower left portions on the substantially square base material. The latent image portion A, the latent image portion B, the latent image portion C, and the background portion are formed by combining the portion B, the latent image portion C, and the background portion similarly formed by the lines. The base material with the phases of the various lines shifted by 1/2 pitch and the center in the horizontal direction, the center in the vertical direction, and the return line in the oblique direction is half folded at each return line, A printed material having a latent image pattern capable of visualizing three latent image patterns can be obtained.

  For example, as shown in FIG. 3A, the form of the latent image portion including the linear pattern, the background portion, and the linear pattern constituting the verification portion may be a linear shape including linear linear lines. Although it may be a pattern, it is not limited to a linear linear pattern consisting of these straight lines, and for example, as shown in FIG. 3 (b), it may be a linear universal linear pattern formed of dots, Alternatively, as shown in FIG. 3 (c), it may be a linear linear pattern of wavy lines.

  In addition to the above, it may be a finely divided shape region such as a stripe shape region by combination or a square dot shape, a round dot shape, a net dot shape, a grid dot shape, or a dot shape by combination thereof .

  In the case where a latent image portion and a background portion are desired to have gradation when viewing the latent image portion and the background portion without passing through the transmitted light under a general illumination condition, a line portion of a line pattern forming the portions The spacing (pitch) to the non-linear portion may be nonuniform, or the thickness of the linear portion of the linear pattern may be nonuniform. With such a configuration, it is possible to adjust the concentration according to the density of the line portion of the line. However, in this case, the verification unit also needs to be patterned in accordance with the pattern, and the positional relationship in the case where the latent image portion, the background portion, and the verification portion are folded becomes severe. Preferably, the alignment portion is provided by printing or the like.

  That is, the number and position of the lines and the form of the lines are not limited, and the printed matter (1) having a latent image pattern formed by an infinite number of combinations can be obtained.

  In the case of forming a line pattern forming a latent image portion, a background portion, and a verification portion by a standard printing method on a general printed matter such as securities, the line width is preferably 30 to 500 μm. By setting it as the range of (1), it is possible to print well with a print having latent image portion, background portion, and verification portion reproducibility (possibility of thin line reproduction) and in which it is difficult to visually recognize a linear pattern. If the line width is less than 30 μm, the reproducibility of the linear pattern is lacking, and these designs are too fine, making visual or machine reading difficult even if the verification portions are superimposed. On the other hand, if it exceeds 500 μm, the boundary between the latent image portion and the background portion formed on the printed matter can be visually identified (even when the verification portion is not superimposed), and copying may be easily reproduced by a copying machine or the like. is there.

  Also, the color tone and color number (monochrome, multicolor), etc. applied to the line portion of various lines are not particularly limited, but since the monochromatic image is poor in image reproduction of all lines, the PCS value (Point Contrast Signal value; relative reflectance) It is desirable that the value indicating the contrast) be 0.2 or more. Also, printing can be reproduced by offset printing, gravure printing, or DDPC. The PCS value is defined by (non-linear reflectance of all lines- (linear reflectance of all lines)) / (non-linear reflectance of all lines).

  In the example shown in FIG. 1, the linear linear patterns constituting the verification unit are formed by the watermark ink, but the linear linear patterns constituting the verification unit are formed by the ordinary ink, and the latent image portion and the background are formed. The linear pattern forming the part may be formed on the watermark ink, or both the latent image part and the background part and the verification part may be formed of the watermark ink. When forming a linear pattern forming the latent image portion and the background portion in the watermark ink, the printed matter is first transmitted to transmitted light to reveal the watermark pattern consisting of the latent image portion and the background portion, and the verification portion is further superimposed. It is possible to make a two-step determination to reveal the latent image by observing it together.

  Of the latent image portion, the background portion, and the verification portion, the one not formed with the watermark ink does not necessarily have to form a linear pattern by printing, and for example, a linear pattern on the substrate itself by a concavo-convex structure etc. May be formed.

  Next, the printed matter of the present invention can be printed by a known printing method such as an offset printing method, an intaglio printing method, a gravure printing method and the like.

The offset printing method is a method in which printing is performed using offset ink using a plano-concave plate, a PS plate, or a waterless lithographic plate whose image area is lowered by about 3 μm.

The intaglio printing method is a method in which printing is performed using an ink for intaglio printing using a printing plate in a state in which an image portion is indented.

In the gravure printing method, copper is plated on the surface of an iron cylinder to form a base, a release layer is provided on the copper-plated surface, and copper is plated to make the surface mirror-like. Recesses (cells) are created on the polished copper surface by the engraving method or corrosion method, the gravure printing ink in the cells is transferred to the substrate surface, and even printing can be performed colorfully, and printing with high appealing effect It is a system.

Although "paper" is considered as a representative example of the substrate used in the present invention, as a paper substrate made of thin paper having an opacity of 50% or less, for example, a high quality of about 55 g / m ² or less in basis weight Examples include paper, medium paper, translucent glassine paper, and imitation paper. However, it is not necessarily limited to paper, and one having an opacity of 50% or less, capable of printing, and particularly having flexibility is preferable. For example, it may be plastic. Plastics are intrinsically transparent or translucent, and their opacity can be selectively increased by printing on the surface or matting (roughening the surface to reduce smoothness). These include cellophane, polycarbonate (PC), polyethylene (PE), polypropylene (PP), polyolefin (PO), ethylene vinyl alcohol (EVOH), polyvinyl alcohol (PVA), polyvinyl chloride, polyethylene naphthalate (PEN) , Polyethylene terephthalate (PET), nylon, acrylic, triacetyl cellulose (TAC) film and the like.

  In the present invention, an opaque substrate may be used, but since the authenticity determination is performed through the substrate, in the case of an opaque substrate, it is necessary to devise a window or the like in the substrate. It does not.

  As the opaque substrate, for example, paper using fibers such as Mitsukobo, manila cotton, flax etc., natural Japanese paper using natural wood pulp fibers, mixed paper using natural wood pulp fibers and synthetic fibers And paper such as synthetic washi using only synthetic fibers, high-quality paper, art paper, coated paper, synthetic paper, metal foil and the like.

  The "opacity" mentioned above is a value obtained by the paper opacity test method defined in JIS P8138, and is measured by setting a green filter using a hunter reflectometer. The measurement method is as follows: when using a green filter, a white plate with a reflectance of 89% is used, and when a black plate (with a reflectance of 0.5% or less as well) is used The reflectance ratio is indicated by percentage.

  As the watermark ink, for example, a colorless printing ink mainly composed of boiled oil is used to form a watermark print layer by letterpress printing or the like by penetration into a paper substrate, and the drying property, spinnability and the like are improved. For example, a colorless printing ink proposed in Japanese Patent Application Laid-Open No. 02-127599 uses, for example, a watermarking ink in which a normal temperature solid resin having a light refractive index similar to cellulose and a wax, an animal oil and the like are blended. It can also be done.

  These watermark inks are used to make a difference between the opacity of the line portion of the line pattern and the non-line portion, and fold or fold the verification line line pattern into the latent image portion line pattern formed on the printed matter. In order to be matched with each other, the pattern in which the latent image pattern is visualized by transmitted light from behind can be viewed or machine-readable from the front. For example, in the case of a paper substrate, the light shielding property is too high due to the paper fiber, and it is difficult to clearly see the visualized latent image even if one sheet of paper substrate is folded and overlapped and held over light. By providing a watermark ink pattern in the latent image portion, the transparency of the paper substrate is improved, and the visualized latent image can be viewed.

  Furthermore, in addition to the watermark ink, it is possible to produce variations by adding a material used for security ink. For example, a fluorescent ink, an infrared absorption ink, etc. are mentioned.

As a fluorescent substance (pigment) which is dispersed in the former fluorescent ink and emits fluorescence at a short wavelength (about 254 nm), for example, Zn ₂ SiO ₄ : Mn, Ca ₂ B ₅ O ₉ Cl: Eu ²⁺ CawO ₄ ZnO: Zn, Y ₂ O ₂ S: Ag, YVO ₄ : Eu, Gd ₂ O ₂ S: Tb, LaO ₂ S: Tb, Y ₃ Al ₅ O ₁₂ : Ce, etc. Can be used. Further, as a fluorescent substance (pigment) emitting fluorescence of long wavelength (about 340 nm), it is a resin solid solution of a fluorescent dye such as an aromatic heterocyclic derivative, and as the resin, polymethacrylic acid ester, urea / formalin resin, melamine · Formalin resin, vinyl chloride, polyvinyl chloride / vinyl acetate copolymer, alkyd resin and modified products thereof, and fluorescent dyes thereof include, for example, fluorescein, eosin, rhodamine B, and rhodamine as aromatic heterocyclic derivatives. 6G, dyes such as thioflavin, diaminostilbezdisulfonic acid, imidazole, coumarin, triazole, carbazole, derivatives such as pyridine, naphthalic acid, imidazolone, and compounds having a benzene ring such as anthracene, etc., and printed with these fluorescent inks The latent image pattern The illumination of the black light enables visual or machine reading.

  Also, as the latter infrared absorbing ink, an infrared absorbing material that absorbs only the infrared wavelength region is dissolved and dispersed in a binder resin and a solvent or the like, and an ink adjusted to a printing method (offset, gravure, letterpress, screen printing, etc.) It is said that.

As this ink, for example, phosphoric acid crystal powder containing phosphorus pentoxide as a main component and containing iron oxide or copper oxide or both, glass-based powder containing phosphorus pentoxide as a main component and containing Fe ²⁺ or Cu ²⁺ ion, infrared rays of metal complex Absorbing materials, cyanine-based, phthalocyanine-based, naphthalocyanine-based, anthraquinone-based, colonic methine-based, azureonium-based, pyrilium-based, and other infrared-absorbing dyes can be mentioned, and as the binder, polyvinyl chloride, vinyl acetate-vinyl chloride Copolymers, polyacrylics, polystyrenes, polyamides and the like resins may be mentioned, and examples of the solvent include linseed oil, kiribellis, toluene, acetone, alcohols such as isopropyl alcohol, methyl ethyl ketone, ethylene glycol and the like. , Offset etc) The binder and solvent may be selected according to the printing method and the substrate, and may be adjusted in consideration of viscosity, transferability, drying property, etc. to obtain an ink containing an infrared absorbing material, and printing with these infrared ray absorbing inks The latent image pattern thus obtained can be observed on the monitor of an infrared verifier comprising an infrared camera for detecting an infrared absorbing substance and a monitor.

  As described above, by using a latent image pattern or the like printed with a fluorescent ink which can not be visually recognized under white light or a colorless infrared-absorbing ink other than the one containing carbon black, machine reading by a verifier etc. which judges its authenticity In this case, it is possible to obtain a printed matter having a latent image pattern with higher security, which can not be visually recognized and can not be reproduced by copying in a copying machine or the like.

  Although it is necessary to select printing ink suitably according to a printing method as printing ink which prints other printing fields etc. which do not use watermark ink, for example, printing ink which has boiled oil as a main component, or urethane system resin Such as thermosetting resins such as epoxy resins and polyester resins, or ultraviolet curable resins which are polymerized and cured by ultraviolet light, or polyvinyl chloride, polyvinyl chloride-vinyl acetate copolymer, acrylic resins, cellulose resins, etc. A printing ink can be used which uses a resin mainly composed of a thermoplastic resin as an ink binder or an ink vehicle, and a cationic polymerization initiator such as p-nitrobenzenediazonium hexafluorophosphate, bisphenol A-epichlorohydrin type epoxy resin, novolac Epoxy resin, cycloaliphatic epoxy A resin composition containing an epoxy resin such as fat as a main component, and, if necessary, UV irradiation added with a reactive diluent, an organic solvent, a volatile or non-volatile diluent such as a plasticizer, etc. An epoxy resin composition which can be cationically polymerized can be used as a printing ink.

  The present invention will be described in detail by way of specific examples.

Example 1
Nippon Paper Industries high-quality paper (HSP-55J) was used as a substrate, and swish varnish (YU701FDHSP) was used as a watermark ink. The line pitch of the latent image part, background part and verification part is 2.0 mm, the line width is 1.0 mm, the pitch shift between the latent image part and the background part is 1.0 mm, printing speed 130 m / min, anilox roll 180 Printed by flexographic printing with a line.

  The latent image can be visually observed by bending the printed matter prepared in this manner, superposing the latent image portion, the background portion, and the verification portion, and holding it over a fluorescent lamp indoors (not particularly shown). Also, in the unfolded state, since the transparency is different in the printed part by the watermark ink printing, the buried background part of the latent image part and the verification part by similarly holding the fluorescent lamp in the room for watermarking Although the presence of each was visually confirmed, the boundary between the latent image portion and the background portion was not distinguishable, and the latent image could not be visually confirmed.

1: printed material 11 having a latent image portion formed of a linear pattern and a verification portion and formed of a material containing a watermark ink 11: base 12: printed layer 13: printed line 13 Latent image portion 14 formed of a letter-like pattern ... verification portion 15 composed of a line-shaped pattern ... folded line 16 ... background portion composed of a line-shaped pattern 2 ... line-shaped uniform line-shaped pattern 2a · · · · · · · · · · · · · · · · · · Line pattern is a line of linear pattern 2b · · · · · · line pattern of the wavy line 3 · · · · line moire image 30 · · · latent image portion 32 · · · non-latent image portion 34 · · · Line film 36: visible image O: transmitted light P: line pitch of the line film W: line width of the line film

Claims (5)

A printed material having a printing layer on one or both sides of a substrate,
The printed matter has a latent image portion having a line pattern, a background portion, and a verification portion.
A printed matter, wherein at least one of the latent image portion and the verification portion is made of a material containing a watermark ink.   The printed matter according to claim 1, wherein at least one of the latent image portion and the verification portion is present in the print layer.   The printed matter according to claim 1, wherein the base material has an opacity of 50% or less of at least a part thereof.   The latent image portion is characterized in that an interval between a line portion and a non-ray portion of the linear pattern is not constant, or a thickness of the line portion of the linear pattern is not constant. The printed matter according to any one of Items 1 to 3. It is an authenticity determination method using the printed matter according to any one of claims 1 to 4,
Folding or overlapping the latent image portion and the verification portion by bending or folding the substrate;
A transmitting step of transmitting the printed matter to light;
A verification step of determining whether or not a latent image exists on the printed matter;
A method of judging authenticity.