JP2017019144A - Retroreflective printed matter for counterfeit prevention, method for producing the same, and authenticity discrimination method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a retroreflective printed matter for counterfeit prevention that can be produced at a low cost.SOLUTION: The retroreflective printed matter (10) for counterfeit prevention comprises a base material for printing (1), a reflection material-printing layer (2) including a reflection material (2a) and a spherical transparent body-printing layer (3) including a spherical transparent body (3a) in this order and the spherical transparent body (3a) has an average particle size of not less than 10 μm to less than 50 μm.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a retroreflective printed matter for preventing counterfeiting, a method for producing the same, and a method for determining authenticity using the printed matter.

  Retroreflective articles that reflect light from a light source in the direction of the light source are used in safety-related fields such as road signs and safety belts. Such an article includes a reflecting material and a spherical transparent body such as glass beads. The light incident on the spherical transparent body is reflected by the reflecting material and is emitted from the spherical transparent body again. At that time, since light is emitted in the incident direction, retroreflectivity can be obtained.

  Patent Documents 1 and 2 disclose safety-related articles such as firefighting / disaster prevention / safety sign plates provided with retroreflective portions by printing. In Patent Literature 1, a retroreflective article is obtained by printing with ink containing a reflective material and glass beads. Moreover, in patent document 2, it prints with the ink containing a reflecting material, and then prints with the ink containing a glass bead, and obtains the retroreflective article. In the article described in Patent Document 2, high retroreflectivity is obtained.

  In recent years, retroreflective articles have been used for anti-counterfeiting purposes. For example, Patent Document 3 discloses a retroreflective material that can be used as a label having retroreflectivity. This retroreflective material loses retroreflectivity from a part of the retroreflective surface. When this retroreflective material is observed from the position irradiated with light under the irradiation of highly directional light by making the part where the retroreflective property is lost into a pattern such as letters, natural light, indoor illumination light, etc. It is possible to observe patterns that are not visible under certain conditions.

  By attaching a label using the retroreflective material to a product, it can be determined by light irradiation whether the product is an authentic product. For example, a customer uses a mobile phone or smartphone with a camera in which the light source for flash and the lens are close to each other, and irradiates this label with the light source for flash, while passing through the lens and display of the mobile phone or smartphone. When the label is observed, characters and the like that cannot be visually confirmed can be found on the label. Thereby, the customer can recognize that the product is an authentic product to which a special label having retroreflectivity is given.

Japanese Patent No. 4132388 Japanese Patent No. 5243016 Japanese Patent No. 4762807

  The printed matter described in Patent Document 1 has low retroreflectivity. In addition, the retroreflective printed matter described in Patent Document 1 does not take into consideration the friction resistance as a printed matter due to its use, and it is not necessary to perform high-definition printing. With this method, it is not possible to obtain a high-definition printed material useful for anti-counterfeiting or the like. The printed matter described in Patent Literature 2 also has the same problem as the printed matter described in Patent Literature 1.

  The retroreflective material described in Patent Document 3 is produced from a sheet in which spherical transparent bodies are distributed as a whole. Due to the manufacturing method, the retroreflective material described in Patent Document 3 cannot obtain a high-definition retroreflective design. Moreover, in order to make a label, it is necessary to cut from the sheet, and the cut portion is discarded. Therefore, the cost tends to increase.

  Further, since the retroreflective material described in Patent Document 3 is usually used by being attached to a product as a label, it is easy to understand whether a counterfeit prevention measure is taken.

  Therefore, in the present invention, a retroreflective printed matter for preventing counterfeiting that can provide a high-definition and high-brightness retroreflective design and can be obtained at low cost, a manufacturing method thereof, and an authenticity using the same. An object is to provide a determination method. In particular, the present invention makes it difficult to know whether anti-counterfeiting measures are taken, and can provide sufficient anti-counterfeiting anti-counterfeiting retroreflective printed matter, its manufacturing method, and authenticity determination using the same It aims to provide a method.

The present inventors have found that the above problems can be solved by the present invention having the following aspects.
<< Aspect 1 >>
A counterfeit comprising a printing substrate, a reflecting material printing layer containing a reflecting material, and a spherical transparent material printing layer containing a spherical transparent material in this order, and the average particle diameter of the spherical transparent material is 10 μm or more and less than 50 μm Retroreflective print for prevention.
<< Aspect 2 >>
The retroreflective printed matter according to aspect 1, further comprising a pattern layer between the printing substrate and the reflective material printing layer.
<< Aspect 3 >>
The retroreflective printed matter according to aspect 1 or 2, wherein the reflective material printing layer and the spherical transparent body printing layer are formed only on a part of the printing substrate.
<< Aspect 4 >>
The retroreflective printed matter according to any one of aspects 1 to 3, wherein each of the reflective material printing layer and the spherical transparent body printing layer further contains a binder resin.
<< Aspect 5 >>
The retroreflective printed matter according to aspect 4, wherein the solid content ratio of the reflective material in the reflective material print layer is more than 27 mass% and less than 69 mass%.
<< Aspect 6 >>
The retroreflective printed matter according to aspect 4 or 5, wherein a solid content ratio of the spherical transparent body in the spherical transparent body printed layer is more than 69 mass% and less than 97 mass%.
<< Aspect 7 >>
The retroreflective printed matter according to any one of aspects 1 to 6, wherein the spherical transparent body is a glass bead.
<< Aspect 8 >>
The retroreflective printed matter according to any one of aspects 1 to 7, wherein the reflective material is a pearl pigment.
<< Aspect 9 >>
The retroreflective printed matter according to any one of aspects 1 to 8, wherein the retroreflective property can be confirmed by observing through a display while irradiating with a light source for flash of a mobile phone with a camera or a smartphone. .
<< Aspect 10 >>
A method for producing a retroreflective printed material for preventing counterfeiting comprising the following steps:
Preparing a substrate for printing;
A step of forming a reflective material printing layer on the printing substrate using an ink containing a reflective material at 40% by weight or less; and 70% by weight of a spherical transparent body having an average particle size of 10 μm or more and less than 50 μm The process of forming a spherical transparent body printing layer on the said reflecting material printing layer using the ink contained in.
<< Aspect 11 >>
A step of irradiating the retroreflective printed matter according to any one of aspects 1 to 9 with a light source for flash of a mobile phone with a camera or a smartphone, and the printed matter through a display of the mobile phone with a camera or a smartphone. A method for determining the authenticity of a printed matter, which includes a step of observing.

  In the present invention, a retroreflective printed matter for preventing counterfeiting that can provide a high-definition and high-brightness retroreflective design and can be obtained at low cost, a manufacturing method thereof, and an authenticity determination method using the same Can be provided. In particular, the present invention makes it difficult to know whether anti-counterfeiting measures are taken, and can provide sufficient anti-counterfeiting anti-counterfeiting retroreflective printed matter, its manufacturing method, and authenticity determination using the same A method can be provided.

FIG. 1 illustrates the layer structure of one embodiment of the retroreflective print of the present invention. FIG. 2 shows the appearance when one embodiment of the retroreflective printed material of the present invention is observed. FIG. 3 shows the appearance when one embodiment of the retroreflective printed material of the present invention is observed.

  The retroreflective printed matter for preventing counterfeiting of the present invention includes a printing substrate, a reflective material printing layer including a reflective material, and a spherical transparent material printing layer including a spherical transparent material in this order. The spherical transparent body used here is a relatively small spherical transparent body having an average particle diameter of 10 μm or more and less than 50 μm.

  In a normal retroreflective article such as a road sign, a spherical transparent body having a relatively large particle size of more than 50 μm is used in order to obtain high retroreflectivity. On the other hand, in the retroreflective printed matter of the present invention, the reflective material is arranged in layers by printing, and a relatively small transparent spherical body having an average particle diameter of 10 μm or more and less than 50 μm is arranged in layers on the reflecting material. The light incident on the transparent spherical body is reflected by the reflector layer, and thereby, retroreflectivity sufficient for practical use can be obtained as a forgery prevention application. Then, by arranging the reflective material by printing and using a spherical transparent body having a small particle diameter, a highly fine retroreflective design can be obtained with the retroreflective printed matter of the present invention.

  Moreover, in the retroreflective printed matter of the present invention, the reflective material printed layer and the spherical transparent printed layer need only be formed on a part of the printing substrate, and therefore it is necessary to discard the part having retroreflective properties. Absent. Furthermore, a retroreflective design (characters, figures, patterns, etc.) can be expressed without forming a coating layer as described in Patent Document 3 on a spherical transparent body. Therefore, the retroreflective printed material of the present invention can be obtained at low cost.

  In the printed matter of the present invention, the transparent spherical body having a relatively small particle diameter is used, so that the surface roughness of the transparent spherical body printed layer is low. Therefore, in the printed matter of the present invention, since it is difficult to understand the presence of the transparent spherical printed layer even if it is touched by hand, it can be difficult to understand whether the counterfeit prevention measures are taken. Further, since the surface is relatively smooth, it is possible to give sufficient friction resistance as a printed matter.

  FIG. 1 illustrates the layer structure of one embodiment of the retroreflective print of the present invention. The retroreflective printed matter (10) includes a base material for printing (1), a reflective material printing layer (2) formed on a part of the base material for printing (1) and including the reflective material (2a), and It has a spherical transparent body printed layer (3) formed on the reflective material printed layer (2) and containing the spherical transparent body (3a). Moreover, the pattern printing layer (4) exists between the base material for printing (1) and the reflective material printing layer (2).

  The retroreflective printed material (10) is glossy in the reflective material printed layer (2) due to the reflective material contained in the reflective material printed layer (2) under conditions such as natural light and indoor illumination light. It has / or glitter. Further, the entire pattern (4 ′, 4 ″, 4 ′ ″) of the pattern printing layer (4) is visually confirmed regardless of the presence or absence of the reflective material printing layer (2) and the spherical transparent body printing layer (3). be able to. In addition, by including a spherical transparent body having a small particle size, a pattern (4 ″) positioned under the reflector printing layer (2) where the spherical transparent body printing layer (3) does not exist, and a spherical transparent body printing layer ( 3) and the pattern (4 ′ ″) located under the reflective material printing layer (2) can make the difference particularly difficult to understand.

  When the retroreflective printed matter (10) is irradiated with light (X) having high directivity, the spherical transparent printed layer (3) reflects light (Y) in the direction in which light is irradiated. Causes retroreflection. However, the light incident on the position where the spherical transparent printed layer (3) does not exist cannot be retroreflected. As a result, on the printed material (10), retroreflection occurs only in the spherical transparent body printed layer (3).

  As shown in FIG. 1, when the reflective material printing layer (2) and the spherical transparent body printing layer (3) are formed only on a part of the pattern printing layer (4), the light (X) is emitted. When irradiated, the pattern (4 ′, 4 ″) which is not located under the spherical transparent body printed layer (3) and the reflector printing layer (2) is observed from the position irradiated with light, while the spherical transparent body is observed. The pattern (4 ′ ″) located under the printed layer (3) and the reflective material printed layer (2) is relatively difficult to observe because the retroreflected light (Y) is very bright and appears to disappear. Thereby, the forgery prevention effect is enhanced.

  FIG. 2 (a) shows how the retroreflective printed material (10) of one embodiment of the present invention is visually observed. Here, the pattern “ABC” is present, and the reflective material printing layer is present thereon. In addition, the spherical transparent printed layer exists only on the letter “B”. In this case, when the retroreflective printed material (10) is observed from the light irradiation position while irradiating with light having high directivity, only the letter “B” appears to be reflected brightly as shown in FIG.

  FIG. 3 (a) also shows how the retroreflective printed material (10) according to one embodiment of the present invention is visually observed. FIG. 3A also shows a cross-sectional view of the printed matter. This printed matter (10) exists only in the peripheral region of the printing substrate (1); the pattern printing layer (4) having the pattern “ABC”; the reflector printing layer (2): and the letter “B”. A spherical transparent printed layer (3). In this case, when the retroreflective printed material (10) is observed from the light irradiation position while irradiating with highly directional light, as shown in FIG. 3 (b), the region where the spherical transparent printed layer (3) is present. Becomes very high, the letter “B” becomes relatively difficult to observe and disappears.

<Base material for printing>
The substrate for printing used in the retroreflective printed material for preventing forgery of the present invention is not particularly limited as long as it is a material capable of forming a layer by printing.

  Specifically, as the printing substrate, a paper substrate such as high-quality paper, coated paper, art paper, cast coated paper, foil paper, recycled paper, impregnated paper, variable information paper, etc .; film substrate such as , Polyester film, polyolefin film, polystyrene film, vinyl chloride film, polyimide film, variable information film and the like; or a cloth substrate such as a woven fabric and a non-woven fabric may be used. The printed matter may be banknotes, securities, passports, official documents, tickets, cash vouchers, cards and the like.

<Reflective material printing layer>
The reflective material printing layer used in the retroreflective printed matter for preventing counterfeiting of the present invention includes a reflective material. The light incident on the printed material of the present invention is refracted by the spherical transparent body, then reflected by the reflecting material, and further refracted by the spherical transparent body, thereby causing retroreflection. Since the reflective material printing layer can be formed by printing, it can be present in any shape and range on the printing substrate.

  The reflective material included in the reflective material printing layer is not particularly limited as long as it is a material that can reflect light. As the reflective material, a pearl pigment can be used, and for example, mica can be used. In addition, examples of the reflective material include metal or metal compound particles, and specific examples include aluminum particles and zinc sulfide.

  Examples of mica of the pearl pigment include mica coated with a titanium oxide-containing layer. This pigment has a structure in which a titanium dioxide layer is formed on the surface of fine flaky mica, and has pearly luster and various interference colors.

  The reflective material printing layer may further include a binder resin that supports the reflective material. Examples of such a binder resin include resins for ink vehicles used during printing. For example, examples of natural resins include rosin, cocoon, shellac, and gilsonite. Also, for example, synthetic resins include polyamide resin, two-component urethane resin, epoxy resin, acrylic resin, vinyl chloride resin, butyral resin, vinylidene chloride resin, styrene resin, rosin, phenol resin, modified alkyd resin, polyester resin Mention may be made of maleic resins such as chlorinated polypropylene, petroleum resins, rosin-modified maleic resins, cyclized rubbers, chlorinated rubbers, and other synthetic resins and copolymers. Mention may also be made of nitrocellulose and its derivatives.

  The content (solid weight ratio) of the pearl pigment in the reflective material printing layer is, for example, more than 27% by mass, 30% by mass or more, 40% by mass or more, or 45% by mass or more, and less than 69% by mass, 65% by mass. % Or less or 60% by mass or less. Further, the content (solid content weight ratio) of the binder resin in the reflective material printing layer is, for example, more than 31% by mass, 35% by mass or more, or 40% by mass or more, and less than 73% by mass, 70% by mass or less, 60 It can be below mass% or below 55 mass%. If the content of the pearl pigment exceeds 27% by mass, particularly 30% by mass or more, the retroreflective light can be sufficiently confirmed when the retroreflective printed matter is irradiated with light having high directivity. In addition, if the content of the pearl pigment is less than 69% by mass, particularly 65% by mass or less, the printability is not deteriorated, and the reflective material printed layer can be designed smoothly.

<Spherical transparent printed layer>
The spherical transparent body printed layer used in the retroreflective printed material for preventing counterfeiting of the present invention includes a spherical transparent body having an average particle diameter of 10 μm or more and less than 50 μm. The light incident on the printed material of the present invention is refracted by the spherical transparent body, then reflected by the reflecting material, and further refracted by the spherical transparent body, thereby causing retroreflection. Since the spherical transparent printed layer can be formed by printing, it can be present on the substrate for printing in an arbitrary shape and range. For example, as shown in FIG. 2, when the reflective material printing layer is formed as a character string and the spherical transparent body printing layer is formed only on a part of the character string, when the character string is irradiated with light, Retroreflection can be caused only by characters on which the spherical transparent printed layer is printed.

  The spherical transparent body is not particularly limited as long as it can be combined with a reflective material to cause retroreflection, and particularly organic or inorganic glass beads can be mentioned. The refractive index of the spherical transparent body may be, for example, 1.70 or more, 1.75 or more, 1.80 or more, or 1.85 or more, 2.20 or less, 2.15 or less, 2.10 or less. 2.05 or less, or 2.00 or less.

  Since the spherical transparent body has a relatively small average particle diameter, the printability is high and high-definition printing can be performed. In addition, since the average particle size is small, the surface roughness of the spherical transparent body printed layer can be lowered, so that even if the spherical transparent body printed layer is touched by hand, the spherical transparent body printed layer exists. It is difficult to understand.

  Preferably, the average particle size of the spherical transparent body of the present invention is less than 50 μm, 48 μm or less, or 46 μm or less, and may be 10 μm or more, 20 μm or more, 30 μm or more, or 40 μm or more. When the average particle diameter of the spherical transparent body is less than 50 μm, the printability is high and high-definition printing can be performed. Further, the surface roughness of the spherical transparent body printed layer can be reduced, and it is difficult to understand that the spherical transparent body printed layer exists even if the spherical transparent body printed layer is touched by hand. In addition, when the average particle size of the spherical transparent body is 10 μm or more, retroreflectivity with sufficient luminance can be obtained, and the retroreflectivity can be easily confirmed. On the contrary, when the average particle diameter of the spherical transparent body is less than 10 μm, the retroreflective light cannot be confirmed because the retroreflective light is weak and sufficient luminance cannot be obtained. Here, the average particle diameter is a median volume-based integrated fraction measured in accordance with JIS Z8832 (electric detection zone method) using a Multisizer (manufactured by BECKMAN COULTER) and a 100 μm aperture as a measuring device. Is the diameter.

  The spherical transparent body printing layer can contain a binder resin that carries the spherical transparent body, similarly to the reflective material printing layer. Examples of such a binder resin include resins for ink vehicles used during printing. For example, examples of natural resins include rosin, cocoon, shellac, and gilsonite. Also, for example, synthetic resins include polyamide resin, two-component urethane resin, epoxy resin, acrylic resin, vinyl chloride resin, butyral resin, vinylidene chloride resin, styrene resin, rosin, phenol resin, modified alkyd resin, polyester resin Mention may be made of maleic resins such as chlorinated polypropylene, petroleum resins, rosin-modified maleic resins, cyclized rubbers, chlorinated rubbers, and other synthetic resins and copolymers. Mention may also be made of nitrocellulose and its derivatives.

  The content (solid weight ratio) of the spherical transparent body in the spherical transparent body printed layer is more than 69% by mass, 70% by mass or more, 75% by mass or more, or 80% by mass or more, and less than 97% by mass, 95% by mass. % Or less, 93 mass% or less, 90 mass% or less, less than 89 mass%, 85 mass% or less, or 83 mass% or less. The content of the binder resin in the spherical transparent printed layer is, for example, more than 3% by mass, 5% by mass or more, 7% by mass or more, 10% by mass or more, 11% by mass or more, 15% by mass or more, or 17% by mass. Above and below 31% by mass, 30% by mass or less, 25% by mass or less, or 20% by mass or less. When the content of the spherical transparent body is more than 69% by mass, particularly 70% by mass or more, sufficient brightness of retroreflectivity can be obtained. When the content of the spherical transparent body is less than 97% by mass, particularly 95% by mass or less, preferably less than 89% by mass, particularly 85% by mass or less, the printability is high and high-definition printing can be performed. In such an embodiment, the frictional resistance of the spherical transparent body printed layer is good, and the spherical transparent body is hardly detached from the spherical transparent body printed layer. Moreover, in such an aspect, the phenomenon (choking) which falls off when a spherical transparent body is rubbed hardly occurs.

<Picture layer>
The pattern layer can give a pattern to the retroreflective printed matter of the present invention, but the retroreflective printed matter of the present invention may not have the pattern layer. The pattern layer can be formed by printing by a known method using oil-based ink, UV ink, or the like.

<< Method for producing retroreflective printed matter >>
The method for producing a retroreflective printed material for preventing counterfeiting of the present invention includes a step of preparing a printing substrate; a step of forming a reflecting material printing layer on the printing substrate using an ink containing a reflecting material; And a step of forming a spherical transparent body printed layer on the reflective material printed layer using an ink containing a spherical transparent body having an average particle size of 10 μm or more and less than 50 μm.

  As the printing substrate, the printing substrate described above can be used. A pattern layer may be printed on the printing substrate by a known method before printing the reflective material printing layer.

  The reflective material printing layer can be formed by printing. The printing method is not particularly limited, and silk screen printing, gravure printing, intaglio printing, offset printing, letterpress printing, ink jet printing, flexographic printing, and the like can be used.

  In the case of forming a reflective material printing layer, ink is appropriately prepared according to the printing method. For example, the content of the reflective material in the ink is, for example, 5% by mass or more, 10% by mass or more, or 20% by mass or more, and 40% by mass or less or 30% with respect to the total mass of the ink, depending on the printing method. It can be made into the mass% or less. The content of the binder resin in the ink is, for example, 10% by mass or more, or 20% by mass or more, and 90% by mass or less, 80% by mass or less, 70% by mass or less, or 60% by mass or less, depending on the printing method. can do. In addition, the ink may appropriately contain other additives such as a solvent, a dispersion medium, a dispersant, a crosslinking agent, a photopolymerization initiator, a drying accelerator, a wax, and an extender depending on the printing method.

  The spherical transparent body printing layer can be formed by printing in the same manner as the reflector printing layer. The printing method is not particularly limited, and silk screen printing, intaglio printing, and the like can be used.

  In the case of forming a spherical transparent body printing layer, an ink is appropriately prepared according to the printing method. For example, the content of the spherical transparent body in the ink is, for example, 30% by mass or more, 40% by mass or more, or 50% by mass or more, and 80% by mass or less, based on the total mass of the ink, depending on the printing method. It can be 70 mass% or less or 60 mass% or less. The content of the binder resin in the ink is, for example, 5% by mass or more, 10% by mass or more, or 20% by mass or more, and 50% by mass or less, 40% by mass, based on the total mass of the ink, depending on the printing method. It can be below mass% or below 30 mass%. By setting it as such a range, suitable brightness | luminance and friction resistance can be given to printed matter, and printing can be performed comparatively easily. In addition, the ink may appropriately contain other additives such as a solvent, a dispersion medium, a dispersant, a crosslinking agent, a photopolymerization initiator, a drying accelerator, a wax, and an extender depending on the printing method. .

  In the case of producing the above ink, the ink can be obtained by mixing and dispersing optional components such as an auxiliary agent and a colorant in addition to the reflecting material or the spherical transparent body, and the vehicle. it can. The mixing and dispersion of each component can be performed by a mixer such as a single-screw mixer and a twin-screw mixer; an ink mill, such as a three-roll mill, a ball mill, a sand grinder, and an attritor.

  In that case, oil-based ink, UV ink, water-based ink, or oil-based / UV combined ink may be formed. When forming an oil / UV combination ink, a reflector or spherical transparent body, a solvent and a resin are mixed to obtain a mixture, and a photopolymerizable monomer or oligomer is added to the mixture, and an additional vehicle or auxiliary agent is added if desired. Alternatively, a coloring agent is also added, and the mill base for ink is obtained by kneading and dispersing with a dispersing machine such as a bead mill or a three-roll mill. Furthermore, a photopolymerization initiator is added to the mill base for ink, and if desired, other materials can be added to obtain the ink used in the present invention.

《Authenticity judgment method for printed matter》
The printed matter authenticity determination method of the present invention includes the step of irradiating the retroreflective printed matter with a light source for flash of a mobile phone with a camera or a smartphone, and the recursion through the display of the mobile phone with a camera or a smartphone. Observing the reflective print. This method is very useful because authentication can be easily performed with familiar tools.

<Sample preparation>
<Examples 1 to 10>
A pearl pigment (MRB-100RF, Nippon Koken Kogyo Co., Ltd.) and a solvent (vinyl standard solvent, Jujo Chemical Co., Ltd.) are displayed on a vinyl silk printing medium (vinyl ink H type halftone, Jujo Chemical Co., Ltd.). 1 and Table 3 were added, and the mixture was stirred with a mixer to prepare an ink for forming a reflective material printing layer.

  Glass-based silk printing medium (vinyl ink H type halftone, Jujo Chemical Co., Ltd.), glass beads (UB-02M, Unitika Co., Ltd.) with an average particle size of 45 μm and solvent (vinyl standard solvent, Jujo Chemical Co., Ltd.) Were added in the amounts shown in Tables 1 and 3 and stirred with a mixer to prepare an ink for forming a spherical transparent printed layer.

  On a paper base material (OK Prince fine quality, Oji Paper Co., Ltd.), a reflector printing layer and a spherical transparent body printing layer are sequentially formed by silk screen printing using an 80 mesh silk plate, and these two layers are recursively. The retroreflective printed matter of Examples 1-10 which comprised the reflective layer was obtained.

<Comparative Examples 1-4>
Vinyl-based silk printing medium (vinyl ink H type halftone, Jujo Chemical Co., Ltd.), pearl pigment (MRB-100RF, Nippon Koken Kogyo Co., Ltd.), glass beads having an average particle size of 45 μm (UB-02M, Unitika Ltd.) and solvent (vinyl standard solvent, Jujo Chemical Co., Ltd.) were mixed in the amounts shown in Table 2 to prepare an ink containing pearl pigment and glass beads in one liquid.

  One retroreflective layer was formed with this ink by silk screen printing using a 80-mesh silk plate on a paper substrate, and retroreflective printed materials of Comparative Examples 1 to 4 were obtained.

<Evaluation>
<Retroreflectivity>
The retroreflectivity of the printed matter was evaluated by observing the printed matter on the display using the camera function with an iPhone (registered trademark) 6 in a state where the flash light source was emitted and the printed matter was irradiated. . iPhone 6 and the printed material were separated by about 30 cm. When the reflection luminance is high and strong retroreflection occurs, the retroreflection property is evaluated as ◯; when the reflection luminance is low, but the retroreflection property can be confirmed, it is evaluated as △; the reflection luminance is low and the retroreflection property is low. When it was difficult to confirm the property, it was evaluated as x.

<Abrasion resistance>
Using an S-type friction tester (manufactured by Kumagai Riken Kogyo Co., Ltd.) in accordance with JIS K5701, after 70 friction tests with a force of 4 lb, the glass beads were peeled to determine the friction resistance. . Specifically, the printed matter was irradiated with a dedicated light before and after the test, and the reflection luminance was visually confirmed. Evaluates as ◯ when there is no change in the reflected luminance; evaluates as △ when the reflected luminance decreases, but can be confirmed retroreflective; the reflected luminance is low, and it is difficult to confirm the retroreflectivity In some cases, it was evaluated as x.

<choking>
The printed layer of glass beads was lightly rubbed with a finger to visually check whether the glass beads were dropped (choking). Evaluate as ○ when choking is not confirmed; Evaluate as △ when the amount of choking can be confirmed in a small amount but is not a problem in practice; Evaluate as x when there is a lot of choking and is actually a problem level .

<Smoothness of printing>
The smoothness of the retroreflective design was evaluated by observing the printed matter in the same manner as the retroreflective evaluation. If a high-definition and smooth retroreflective design can be confirmed, evaluate the smoothness as ○; if the retroreflective design looks somewhat rough due to poor printability of the reflective print layer The smoothness was evaluated as △; when the reflective material printed layer was drowned and the retroreflective design could not be sufficiently confirmed, the smoothness was evaluated as x.

"result"
The printed matter of Examples 1 to 10 in which the retroreflective layer is composed of two layers of a spherical transparent body printing layer containing glass beads and a reflector printing layer containing pearl pigments, and glass beads and pearl pigments are included. The printed matter of Comparative Examples 1 to 4 in which the retroreflective layer was constituted by one layer was compared in the above test. The obtained results are shown in Tables 1 to 3 below.

  In the printed matter of the present invention described in Examples 1 to 10 in which the pearl pigment-containing layer (reflective material printed layer) and the glass bead-containing layer (transparent spherical body printed layer) are separately configured, retroreflective with relatively high luminance is provided. It was possible to print relatively easily while giving the properties. In addition, since the printing design is high definition and it is difficult to understand the presence of the transparent spherical printed layer even if it is touched by hand, it is difficult to understand that anti-counterfeiting measures have been taken. In particular, in Examples 3 and 4, the friction resistance was good and no choking occurred. Moreover, about Example 3 and 9, the printability of the reflective material printing layer was favorable, and the retroreflective design was smooth.

DESCRIPTION OF SYMBOLS 1 Substrate for printing 2 Reflecting material printing layer 2a Reflecting material 3 Spherical transparent body printing layer 3a Spherical transparent body 4 Picture printing layer 4 ', 4 ", 4'" Picture 10 Retroreflective printed matter X Irradiation light Y Retroreflective light

Claims (11)

  A counterfeit comprising a printing substrate, a reflecting material printing layer containing a reflecting material, and a spherical transparent material printing layer containing a spherical transparent material in this order, and the average particle diameter of the spherical transparent material is 10 μm or more and less than 50 μm Retroreflective print for prevention.   The retroreflective printed matter according to claim 1, further comprising a pattern layer between the printing substrate and the reflective material printing layer.   The retroreflective printed matter according to claim 1 or 2, wherein the reflective material printing layer and the spherical transparent body printing layer are formed only on a part of the printing substrate.   The retroreflective printed matter according to any one of claims 1 to 3, wherein each of the reflective material printing layer and the spherical transparent body printing layer further contains a binder resin.   The retroreflective printed matter according to claim 4, wherein a solid content ratio of the reflecting material in the reflecting material printing layer is more than 27% by mass and less than 69% by mass.   The retroreflective printed matter according to claim 4 or 5, wherein a solid content ratio of the spherical transparent body in the spherical transparent body printed layer is more than 69 mass% and less than 97 mass%.   The retroreflective printed matter according to any one of claims 1 to 6, wherein the spherical transparent body is a glass bead.   The retroreflective printed matter according to any one of claims 1 to 7, wherein the reflective material is a pearl pigment.   The retroreflective property according to any one of claims 1 to 8, wherein the retroreflective property can be confirmed by observing through a display while irradiating with a light source for flash of a mobile phone with a camera or a smartphone. Printed matter. A method for producing a retroreflective printed material for preventing counterfeiting comprising the following steps:
Preparing a substrate for printing;
A step of forming a reflective material printing layer on the printing substrate using an ink containing a reflective material at 40% by weight or less; and 70% by weight of a spherical transparent body having an average particle size of 10 μm or more and less than 50 μm The process of forming a spherical transparent body printing layer on the said reflecting material printing layer using the ink contained in.   Irradiating the retroreflective printed matter according to any one of claims 1 to 9 with a light source for flash of a mobile phone with a camera or a smartphone, and the display through the mobile phone with a camera or a smartphone A method for determining the authenticity of a printed matter, comprising the step of observing the printed matter.