JP4537269B2 - Printed matter - Google Patents

Description

  The present invention relates to a printed matter, and in particular, an image composed of an ink layer is formed by printing an ink layer constituting a predetermined image on the surface of a substrate and rubbing the surface of the substrate with coins. The present invention relates to an improvement of a printed material in which is displayed.

  Conventionally, a lower ink layer constituting various images such as letters, numbers, patterns, and patterns has been printed on the surface of a paper or synthetic resin base material, and on the lower ink layer. It is printed so that a colored upper ink layer that can conceal it is laminated, and the upper ink layer is scraped off with coins, nails, etc., so that an image composed of the lower ink layer appears The so-called scratch-type printed matter is suitably used for various lotteries, game cards, and the like.

  In addition, as a kind of such a scratch-type printed matter, the surface of the base material includes, for example, a hard material having a hardness higher than the metal constituting the coin, such as titanium oxide, and the same color as the base material surface, There is known one in which an ink layer constituting a predetermined image is formed by printing (see, for example, Patent Document 1 below). In this printed matter, when the substrate surface is rubbed with coins, the metal of the coins is scraped off by the hard material in the ink layer formed on the substrate surface, and the ink layer is formed by the scraped metal. Coloring or discoloration is performed, so that an image composed of such an ink layer can be displayed.

  In such a printed matter, unlike the printed matter in which the upper image layer formed so as to be laminated on the lower ink layer constituting the predetermined image is scraped and the predetermined image appears. Although there is an advantage that dust scraps can be advantageously avoided due to the scraped ink layer portion, the substrate surface can be viewed from various angles without rubbing the substrate surface with coins. There has been a drawback that an image composed of the ink layer is visually recognized due to a difference in gloss between the surface and the ink layer.

  Therefore, on the surface of the base material, a white solid printing layer is printed and formed with a white printing ink containing a white pigment made of titanium oxide or the like, and a white pigment made of titanium oxide or the like is formed on the white solid printing layer. An overprint layer with a white overprint varnish that is contained in an amount less than the content in the white printing ink is printed to form a predetermined image (confidential information data) in a pattern or pattern, and the substrate surface Are rubbed with coins, so that only the white solid printed layer portion corresponding to the overprint layer removal pattern or the white solid print layer portion corresponding to the portion other than the pattern portion of the overprint layer is colored, and these are removed. In recent years, a printed material in which a pattern or an image composed of a pattern appears has been proposed (for example, See below Patent Document 2).

  In such a printed matter, an overprint layer of a white overprint varnish of the same color as that of the white solid print layer is laminated with a predetermined cut pattern or pattern, so that the overprint layer can be removed. It is difficult to discriminate between a pattern or an image composed of a pattern and a white solid print layer, and the concealment of the image is improved.

However, the present inventors have, was added examined images secrecy in the conventional printed material having an ink layer of the two layers of the white solid print layer and a white overprint layer, the content of the white pigment in the white solid print layer There is a slight difference in hue and light reflectance between the white solid print layer and the white overprint layer based on the difference between the white pigment content in the white overprint layer and the white overprint layer. Therefore, it has been recognized that an image constituted by a blank pattern or a pattern of an overprint layer and a white solid print layer can be distinguished by reflection of light or the like. As a result, it is difficult to say that such a conventional printed matter is difficult to discriminate between an image constituted by a blank pattern or a pattern of an overprint layer and a white solid print layer. It turns out that there is room for improvement.

Japanese Patent Publication No. 6-78039 JP 2004-34384 A

  Here, the present invention has been made in the background of the circumstances as described above, and the problem to be solved is that the substrate surface is rubbed with coins to form a print on the surface of the substrate. On the other hand, the image composed of the formed ink layer is surely displayed and clearly visible, but before the surface of the base material is rubbed with coins, the image can be made more difficult to visually recognize. It is to provide an improved printed matter.

And in the printed matter which is the object of the present invention , ( a) a base material whose surface is a printing surface, and (b) titanium oxide on the entire surface of the predetermined region of the printing surface of the base material. A base ink layer composed of a large number of halftone dots printed by halftone dot printing using an ink containing a white pigment composed of at least one of barium sulfate and calcium carbonate, and (c) the base ink layer An overcoat ink layer is formed on the base ink layer. The overcoat ink layer comprises a portion formed or not formed on the base ink layer. It is characterized by that .

  That is, in the printed matter according to the present invention, when the printing surface of the base material is rubbed with coins, the metal constituting the coins is scraped off with the white pigment contained in the ink forming the base ink layer. By this scraped metal, the upper surface of the base ink layer where the upper surface is exposed without being covered with the overcoat ink layer, ie, the portion other than the overcoat ink layer forming portion in the base ink layer is colored ( Discoloration). As a result, when a predetermined image is formed by the formation portion of the overcoat ink layer on the base ink layer, such an image is not colored, and only the periphery thereof is colored, and the colored base ink is colored. If the image appears inside the layer in an embossed state and a predetermined image is formed by a non-formation portion of the overcoat ink layer on the base ink layer, the image is colored. , Will come out. As a result, the image composed of the overcoat ink layer can be surely recognized for the first time only when the printing surface of the substrate is rubbed with coins.

  In particular, in such a printed matter, for example, on the conventional printed matter to be described above, that is, on the white solid printed layer, a white color slightly different from the white solid printed layer due to the difference in the content of the white pigment. Unlike a printed material in which a predetermined image is formed on the overprint layer, the predetermined image is partially formed on the base ink layer containing the white pigment. Since it is composed of a colorless overcoat ink layer, it is composed of an overcoat ink layer due to the difference in color between the base ink layer and the overcoat ink layer before the substrate surface is rubbed with coins. It is possible to effectively eliminate the difference between the image and the base ink layer.

  Moreover, in the printed matter according to the present invention, since the base ink layer is composed of a large number of halftone dots printed by halftone printing, unlike the case where the base ink layer is printed by solid printing, The surface of the base ink layer has an uneven shape, so that the light irradiated on the surface of the base ink layer is diffusely reflected. Therefore, even if the base ink layer and the overcoat ink layer have different reflectances, the base surface is constituted by the overcoat ink layer by light reflection before being rubbed with coins. It is also possible to advantageously eliminate the fact that it is easy to distinguish between the image and the base ink layer.

  In addition, in such a printed matter, since the base ink layer is composed of a large number of halftone dots, the base ink layer is compared with the case where each halftone dot base ink layer is printed by solid printing. The surface area of the base material layer is sufficiently large, so that when the substrate surface is rubbed with a coin, the metal constituting the coin is more of the white pigment located in the surface layer portion of the base ink layer, Further, it is possible to cut more reliably and more. As a result, the upper surface of the non-formation portion of the overcoat ink layer in the base ink layer can be more sufficiently colored with the scraped metal.

  Therefore, in such a printed matter according to the present invention, the surface of the base material is rubbed with coins, so that a predetermined image can be surely displayed and can be visually recognized more clearly. Before the image is rubbed with coins, it can be made more difficult to view such an image. As a result, the concealment of the image can be effectively improved, and therefore, it can be used extremely advantageously as a scratch-type printed material used for various lotteries, game cards, and the like.

Aspects of the Invention

By the way, in order to solve the above-described problems , the present invention can be suitably implemented at least in various aspects as listed below.

<1> (a) a substrate whose surface is a printing surface, and (b) at least any of titanium oxide, barium sulfate, and calcium carbonate on the entire surface of the predetermined region of the printing surface of the substrate. A base ink layer composed of a large number of halftone dots printed and formed by halftone dot printing using an ink containing one kind of white pigment; and (c) partially using colorless ink on the base ink layer. A printed matter comprising an ink layer formed by printing and comprising an overcoat ink layer constituting a predetermined image by a formed portion or a non-formed portion on the base ink layer.

<2> In the above aspect <1>, the number of screen lines of the halftone dots in the base ink layer is 85 to 120 lines. According to this aspect, each of the halftone dots can be of an appropriate size, whereby the base metal layer is overcoated with the metal of the coin that is scraped off when the substrate surface is rubbed with the coin. The upper surface of the non-formed portion of the ink layer can be more sufficiently colored, and the appearance of the non-formed portion of the overcoat ink layer in the base ink layer is effectively prevented, so that the image can be concealed more skillfully. .

<3> In aspect <1> or aspect <2> described above, the dot area ratio in the base ink layer is 70% or more. In this embodiment, the light applied to the surface of the base ink layer is more sufficiently diffusely reflected, thereby distinguishing the image formed by the overcoat ink layer from the base ink layer. However, it can be made even more difficult, so that the concealment of the image can be improved more effectively. Moreover, the upper surface of the non-formation part of the overcoat ink layer in a base ink layer can be more fully colored with the metal of the coin scraped off when the substrate surface is rubbed with a coin.

<4> In any one of the modes <1> to <3> described above, the base ink layer contains the white pigment in an amount of 5% by weight or more. According to this aspect, the upper surface of the non-formation portion of the overcoat ink layer in the base ink layer can be more sufficiently colored with the metal of the coin that is scraped off when the substrate surface is rubbed with the coin.

<5> In any one of the above aspects <1> to <4>, the ink used for forming the base ink layer is solidified on the printing surface of the substrate. And a base ink layer forming main element for fixing the white pigment to the printing surface to form the base ink layer on the printing surface, and a solvent for dissolving the base ink layer forming main element, and The ratio of each content of the base ink layer forming main element and the solvent in the ink is within the range of 10 to 350 parts by weight of the solvent with respect to 100 parts by weight of the base ink layer forming main element. It must be a value.

  In this embodiment, when the white pigment contained in the base ink layer partially protrudes from the surface of the base ink layer, the surface of the substrate is rubbed with coins. , The metal of the coin is scraped more fully. As a result, the upper surface of the non-formation part of the overcoat ink layer in the base ink layer can be more sufficiently colored with more metal, and the image composed of the overcoat ink layer becomes clearer. Can be recognized. In addition, even when the base ink layer is formed by printing using a screen printing method, the thinning of the base ink layer can be advantageously realized, and the presence of the base ink layer can be effectively concealed. There are also advantages.

<6> In any one of the above aspects <1> to <5>, the colorless ink used for the printing formation of the overcoat ink layer is solidified on the base ink layer. An overcoat ink layer forming main element for forming the overcoat ink layer on the base ink layer, and a solvent for dissolving the overcoat ink layer forming main element, and the overcoat ink in the colorless ink The ratio of each content of the layer forming main element and the solvent is a value within the range of 10 to 350 parts by weight of the solvent with respect to 100 parts by weight of the overcoat ink layer forming main element. .

  In this embodiment, the viscosity of the colorless ink that forms the overcoat ink layer is effectively reduced, so that the surface of the overcoat ink layer corresponds to the surface of the base ink layer composed of a large number of dots. Due to the uneven shape, irregular reflection of light occurs on the surface and edge portion of the overcoat ink layer. As a result, it is possible to make the discrimination between the image composed of the overcoat ink layer and the base ink layer by reflecting light more difficult, and thus the concealment of the image can be improved more effectively. .

  In addition, according to this aspect, even when the overcoat ink layer is formed by printing using a screen printing method, the overcoat ink layer can be made as thin as possible. There is also an advantage that the presence of the ink layer and thus the image can be effectively concealed.

<7> In any one of the above aspects <1> to <6>, the colorless ink used for printing the overcoat ink layer adjusts the gloss of the overcoat ink layer. The adjustment material is included, and the gloss of the overcoat ink layer is adjusted to be the same as that of the base ink layer. In this embodiment, for example, by containing the gloss adjusting material, the light reflectance in the overcoat ink layer can be made to be as large as the light reflectance in the base ink layer, and thereby the overcoat Discrimination by reflection of light between the image composed of the ink layer and the base ink layer can be made even more difficult, and the image can be concealed more skillfully.

  Hereinafter, in order to clarify the present invention more specifically, a specific configuration of a printed matter according to the present invention will be described in detail with reference to the drawings.

  First, in FIG. 1 and FIG. 2, one embodiment of a printed matter having a structure according to the present invention is schematically shown in a transverse sectional form and a longitudinal sectional form, respectively. As is clear from these drawings, the printed matter of the present embodiment has a printing sheet 10 as a base material, and a base ink layer 12 and an overcoat ink layer 14 are arranged on the upper surface thereof on the lower side. Thus, it is formed by being laminated. In addition, in each of FIG.1 and FIG.2 and also FIG.3, FIG.5, FIG.6 mentioned later, in order to make an understanding of the structure of the printed matter of this embodiment easy, the base ink layer 12 and the overcoat ink layer It should be understood that 14 etc. are exaggerated and shown with an extremely thick thickness.

  More specifically, the printing sheet 10 is formed of a rectangular thin flat plate made of a paper material or a synthetic resin material. In the printing sheet 10, the upper surface is the printing surface 16, and the base ink layer 12 is formed on the entire circular area at the center of the printing surface 16.

  As shown in FIG. 3, the base ink layer 12 is composed of an aggregate of a large number of halftone dots 18. In addition, a large number of granular white pigments 20 are dispersed inside each of the large number of halftone dots 18. That is, the base ink layer 12 is printed and formed by halftone dot printing using a printing ink containing the white pigment 20 by any known printing method such as letterpress printing, intaglio printing, offset printing, and screen printing. -ing

  Thus, as indicated by the arrows in FIG. 3, the light irradiated on the surface of the base ink layer 12 is irregularly reflected on the surface of each halftone dot 18 so that the gloss emitted on the surface of the base ink layer 12 is kept low. Therefore, the entire base ink layer 12 exhibits a matte white color.

  Here, in particular, the white pigment 20 dispersed in each halftone dot 18 of the base ink layer 12 has a higher hardness than metals used in coins, such as copper, iron, aluminum, zinc, lead and the like. Titanium oxide, barium sulfate, and calcium carbonate having the above are used alone or in combination of two or more thereof.

  Thereby, when the surface of the base ink layer 12 is rubbed with coins, the metal constituting the coins is scraped off by the white pigment 20 in the base ink layer 12, and with the scraped metal, The portion of the surface of the base ink layer 12 rubbed with coins can be changed from white to, for example, black or blackish gray.

  In addition, as described above, here, the base ink layer 12 is configured by a large number of halftone dots 18, so that it has a sufficiently large surface area. Therefore, when the surface of the base ink layer 12 is rubbed with a coin, the coin is brought into contact with more white pigments 20 located on the surface layer portion of the base ink layer 12, and the metal of the coin is The surface of the base ink layer 12 is scraped off more reliably and sufficiently, so that the surface of the base ink layer 12 is changed to a darker color.

  On the other hand, the overcoat ink layer 14 laminated and formed on the base ink layer 12 is any one of known printing methods such as letterpress printing, intaglio printing, offset printing, and screen printing using colorless printing ink. Is printed and formed to be colorless and transparent. Further, in such an overcoat ink layer 14, a granular gloss adjusting material 21 such as a known mat material contained in the colorless ink forming the overcoat ink layer 14 is dispersed.

  Thereby, the light irradiated on the surface of the colorless and transparent overcoat ink layer 14 is diffusely reflected by the gloss adjusting material 21 in the overcoat ink layer 14. And here, the gloss emitted on the surface of the colorless and transparent overcoat ink layer 14 is adjusted, for example, by appropriately adjusting the amount of the gloss adjusting material 21 dispersed in the overcoat ink layer 14. It is adjusted so as to be kept as low as the surface of the base ink layer 12.

  Further, as is apparent from FIGS. 1 and 2, the overcoat ink layer 14 includes a center-side overcoat ink layer portion 14a having a circular shape laminated at the center of the upper surface of the base ink layer 12, and a base ink layer. The outer peripheral side overcoat ink layer part 14b which exhibits the wide ring shape laminated | stacked on the outer peripheral part of 12 upper surfaces. The inner diameter of the ring-shaped outer peripheral side overcoat ink layer portion 14b is set to be larger than the outer diameter of the circular center side overcoat ink layer portion 14a by a predetermined dimension. Between the central portion and the outer peripheral portion, the overcoat ink layer non-forming portion 22 is provided in the form of a circular groove.

  In other words, here, the overcoat ink layer 14 is partially printed and formed on the center portion and the outer peripheral portion of the upper surface of the base ink layer 12 so as to cover those portions. Between the central portion and the outer peripheral portion of the ink layer 12, there is an overcoat ink layer non-formed portion 22 in which the surface of the base ink layer 12 is exposed without being covered with the overcoat ink layer 14. I'm hurt. Then, on such a base ink layer 12, an image 24 depicting a circle corresponding to a circular groove shape is formed by the overcoat ink layer non-formed portion 22 whose surface is exposed. It has been done.

  Thus, in this embodiment, when the entire printing surface 16 of the printing sheet 10 is rubbed with coins, as shown in FIG. 4, the center overcoat ink layer portion 14a on the base ink layer 12 is obtained. In the formation part of the outer peripheral side overcoat ink layer part 14b and the formation part of the outer peripheral side overcoat ink layer part 14b, coins slide on the surfaces of the center side and outer peripheral side overcoat ink layer parts 14a, 14b, and the metal constituting the coin is scraped off. Therefore, no discoloration is possible. On the other hand, in the overcoat ink layer non-formation part 22 on the base ink layer 12, the metal of the coin is scraped off by the white pigment 20 in the base ink layer 12 whose surface is exposed, and the scraped metal The surface portion of the base ink layer 12 exposed in the overcoat ink layer non-formation portion 22 can be changed from white to black or blackish gray. As a result, an image 24 that draws a circle appears on the printing surface 16 of the printing sheet 10.

  Further, here, since the overcoat ink layer 14 constituting the image 24 is colorless and transparent, there is a difference in hue between the colorless and transparent overcoat ink layer 14 and the white base ink layer 12. What happens is advantageously eliminated. In addition, as described above, irregular reflection of light is caused on the surface of the base ink layer 12, and furthermore, by the gloss adjusting material 21 dispersed in the overcoat ink layer 14. Further, the gloss of the surface of the overcoat ink layer 14 is approximately the same as the gloss of the surface of the base ink layer 12. Therefore, even if the light reflectance of the base ink layer 12 and the light reflectance of the overcoat ink layer 14 are different from each other, before the printing surface 16 of the printing sheet 10 is rubbed with coins. Distinguishes the image 24 that is drawn from the overcoat ink layer non-formation portion 22 and the central overcoat ink layer portion 14a and the outer overcoat ink layer portion 14b by the difference in color, the reflection of light, and the like. The image 24 can be concealed skillfully.

  By the way, in such a printed matter of this embodiment, as described above, the base ink layer 12 is composed of an aggregate of a large number of halftone dots 18, but the shape of the large number of halftone dots 18 ( The planar shape is not particularly limited, and as a shape of the halftone dot 18 such as an elliptical shape, a rectangular shape, a rhombus shape, a cross shape, a line shape, and a chain shape in addition to a circular shape as illustrated in FIG. Any of conventionally known ones may be used.

  The size of each halftone dot 18 is not particularly specified, but is preferably set to a size such that the number of screen lines is about 85 to 120 lines. This is because when the number of screen lines of the halftone dots 18 is less than 85 lines, each halftone dot 18 is too large, and thus the one in the portion of the base ink layer 12 exposed in the non-overcoat ink layer non-formation portion 22. Each halftone dot 18 can be easily confirmed with the naked eye, so that an image 24 depicting a circle to be concealed is easily visually recognized before rubbing the printing surface 16 of the printing sheet 10 with coins. This is because there is a fear that it will become. If the number of screen lines of the halftone dots 18 is larger than 120 lines, each halftone dot 18 is too small and the amount of the white pigment 20 dispersed in each halftone dot 18 becomes too small. Therefore, when the printing surface 16 of the printing sheet 10 is rubbed with coins, the amount of metal in the coins scraped off by the white pigment 20 in each halftone dot 18 is reduced, thereby the overcoat ink layer non-forming portion. This is because the discoloration of the base ink layer 12 exposed at 22 due to the scraped metal becomes insufficient, and the image 24 that appears may become unclear.

  Furthermore, even when the density of the halftone dots 18 in the base ink layer 12 formation region printed on the printing surface 16 of the printing sheet 10 is too small, the printing surface 16 of the printing sheet 10 is rubbed with coins. As a result, the image 24 that appears may become unclear, and the diffuse reflection of light at the base ink layer 12 becomes insufficient, so that the image 24 and the base ink layer 12 formed by the overcoat ink layer 14 are present. There is also a concern that it will be easy to distinguish. Therefore, the halftone dot area ratio in the base ink layer 12 representing the density of such halftone dots 18, that is, per unit area of the base ink layer 12 formation region printed on the printing surface 16 of the printing sheet 10. The percentage of the ratio occupied by halftone dots 18 is preferably 70% or more, more preferably 70 to 90%. As a result, the surface of the portion of the base ink layer 12 exposed in the non-overcoat ink layer non-formation portion 22 is more sufficiently discolored by the scraped metal, so that an image 24 depicting a circle appears clearly. In addition, before the printing surface 16 of the printing sheet 10 is rubbed with coins, the concealment of the image 24 can be sufficiently exhibited. When the dot area ratio exceeds 90%, the base ink layer 12 is close to the case where it is printed by solid coating, and the base ink layer 12 and the overcoat ink layer 14 can be easily distinguished from each other. Fear arises.

  Further, the composition of the printing ink used for forming the base ink layer 12 on the printing surface 16 of the printing sheet 10 is not limited as long as it includes the white pigment 20. However, here, the base ink layer 12 is formed on the printing surface 16 by being solidified on the printing surface 16 of the printing sheet 10, and the white pigment 20 is formed inside the base ink layer 12. A base ink layer forming main element such as a resin for ink or wax that is embedded and fixed on the printing surface 16 and a solvent for dissolving the base ink layer, and the base ink layer forming main element and the solvent are included. The ink containing the latter in an amount in the range of 10 to 350 parts by weight with respect to 100 parts by weight of the former is suitably used as the printing ink for forming the base ink layer 12.

  In the printing ink having such a composition, the viscosity can be effectively reduced. Therefore, when the base ink layer 12 is printed and formed using such ink, as shown in FIG. 3, the white pigment 20 positioned in the surface layer portion of each halftone dot 18 of the base ink layer 12 becomes each halftone dot 18. It becomes partly protruded from the surface of the. Thereby, when the printing surface 16 of the printing sheet 10 is rubbed with a coin, the metal of the coin is scraped more reliably and in a sufficient amount by the white pigment 20 in each halftone dot 18, The portion of the base ink layer 12 exposed in the overcoat ink layer non-formation portion 22 is more sufficiently discolored with the scraped metal, so that the image 24 depicting the circle appears more clearly. You will be harassed. Further, the printing ink for forming the base ink layer 12 has the above composition and its viscosity is lowered. For example, the base ink layer 12 is formed by a screen printing method in which the formed ink layer is relatively thick. Even when the ink layer 12 is formed, the base ink layer 12 can be thinned, and the presence of the base ink layer 12 cannot be easily recognized.

  In addition, the ratio of each content of the base ink layer forming main element and the solvent in the printing ink used for forming the base ink layer 12 is 100 parts by weight of the base ink layer forming main element. When the amount is less than 10 parts by weight, the solvent content is too small, and thus the viscosity of the ink is sufficiently reduced, and the white pigment 20 in each halftone dot 18 of the base ink layer 12 is replaced with each halftone dot. Thus, it is difficult to partially protrude from the surface of 18 or to make the base ink layer 12 thin. Therefore, the excellent characteristics as described above obtained by lowering the viscosity of the ink accompanying the increase in the solvent content are obtained. There is a risk of not being able to get enough. Further, when the ratio of the content of each of the base ink layer forming main element and the solvent in the ink exceeds 350 parts by weight with respect to 100 parts by weight of the base ink layer forming main element, In this case, the content of the main element for forming the base ink layer is too small, and the fixing strength of the white pigment 20 on the printing surface 16 of the printing sheet 10 is lowered. Therefore, when the printing surface 16 of the printing sheet 10 is rubbed with a coin, the white pigment 20 can be detached from the base ink layer 12, and as a result, an image 24 that draws a circle appears clearly. May become difficult.

  Further, the amount of the white pigment 20 contained in the ink used for forming the base ink layer 12 is not particularly limited, but the printing is performed in a state where the solvent has disappeared from the ink. It is desirable that the base ink layer 12 formed on the sheet 10 is contained in an amount of 5% by weight or more. This is because when the content of the white pigment 20 in the base ink layer 12 is a small amount that is less than 5% by weight, when the printing surface 16 of the printing sheet 10 is rubbed with coins, The amount of coin metal scraped off by the white pigment 20 in each halftone dot 18 in the ink layer 12 is also reduced, whereby the portion of the base ink layer 12 exposed in the overcoat ink layer non-forming portion 22 is scraped off. This is because there is a possibility that the discoloration due to the metal becomes insufficient and the image 24 to be displayed becomes unclear.

  When the content of the white pigment 20 in the base ink layer 12 is increased, the white pigment 20 is applied to the printing surface 16 of the printing sheet 10 by the base ink layer forming main elements such as the resin for ink and wax. There is a tendency for the adhesive strength to decrease. Therefore, the upper limit of the content of the white pigment 20 in the ink is appropriately determined based on the magnitude of the adhesion of the white pigment 20 to the printing surface 16 of the printing sheet 10.

  Moreover, even when the size of each white pigment 20 is too large, the fixing force of the white pigment 20 to the printing surface 16 of the printing sheet 10 by the base ink layer forming main element can be reduced. It becomes. On the other hand, if the white pigment 20 is too small, when the printing surface 16 of the printing sheet 10 is rubbed with coins, the amount of metal scraped off by the white pigment 20 is reduced, and the overcoat ink layer non-forming part 22, the discoloration of the portion of the base ink layer 12 exposed at 22 becomes insufficient, whereby the image 24 that appears is unclear. Therefore, in order to avoid these problems, it is desirable that the white pigment 20 has an average particle size in the range of 0.19 to 0.9 μm.

  Furthermore, the base ink layer 12 is preferably made as thin as possible in order to prevent its presence from being easily seen, but if it is too thin, the printed sheet 10 is printed. The adhesion of the white pigment 20 to the surface 16 is reduced. Therefore, it is preferable that the thickness of the base ink layer 12 is set to a value in the range of about 0.2 to 1.5 μm in consideration of a desirable average particle diameter of the white pigment 20.

  On the other hand, the composition of the printing ink used to form the overcoat ink layer 14 on the base ink layer 12 is not limited as long as it is a colorless printing ink. However, here, the overcoat ink layer 14 is formed on the base ink layer 12 by being solidified on the base ink layer 12, for example, an overcoat ink layer forming main element such as an ink resin or wax, and the like. And the overcoat ink layer forming main element and the solvent are contained in an amount in the range of 10 to 350 parts by weight of the latter with respect to 100 parts by weight of the former. However, it is suitably used as a printing ink for forming the overcoat ink layer 14.

  In the printing ink having such a composition, the viscosity can be effectively reduced. Therefore, when the overcoat ink layer 14 is formed by printing using such ink, the surface of the overcoat ink layer 14 of the base ink layer 12 provided below the overcoat ink layer 14 is formed as shown in FIG. The surface of each halftone dot 18 has a substantially corrugated shape, so that the light irradiated on the surface of the overcoat ink layer 14 is diffusely reflected on the surface or edge portion. As a result, it becomes more difficult to distinguish the overcoat ink layer 14 from the base ink layer 12 portion exposed in the overcoat ink layer non-formation portion 22 by the reflection of light on the respective surfaces. The edge portions of the center-side overcoat ink layer portion 14a and the outer peripheral-side overcoat ink layer portion 14b are made inconspicuous, so that the overcoat before the printing surface 16 of the printing sheet 10 is rubbed with coins. The image 24 that draws a circle composed of the ink layer non-formed portion 22 can be concealed more skillfully.

  In addition, when the printing ink for forming the overcoat ink layer 14 has the above-described composition and its viscosity is lowered, for example, when the overcoat ink layer 14 is printed by a screen printing method. In addition, each of the center side overcoat ink layer portion 14a and the outer peripheral side overcoat ink layer portion 14b can be thinned. As a result, the overcoat ink layer portions 14a and 14b and thus the image 24 can be made inconspicuous.

  In addition, the ratio of each content of the overcoat ink layer forming main element and the solvent in the printing ink used for forming the overcoat ink layer 14 is 100 parts by weight of the overcoat ink layer forming main element. Is less than 10 parts by weight, the content of the solvent is too small to sufficiently reduce the viscosity of the ink. It becomes difficult to enjoy it effectively. Moreover, when the ratio of the content of each of the overcoat ink layer forming main element and the solvent in the ink is more than 350 parts by weight with respect to 100 parts by weight of the overcoat ink layer forming main element, Since the content of the overcoat ink layer forming main element is too small, the holding power of the gloss adjusting agent 21 dispersed in the overcoat ink layer 14 is lowered. Therefore, when the printing surface 16 of the printing sheet 10 is rubbed with a coin, there is a risk that the gloss adjusting material 21 can be easily detached from the overcoat ink layer 14.

Moreover, it is desirable that the average particle diameter of the gloss adjusting material 21 contained in the ink that forms such an overcoat ink layer 14 is a value within the range of 2.0 to 5.5 μm. This is because when the average particle diameter of the gloss adjusting material 21 is larger than 5.5 μm, the holding power in the overcoat ink layer 14 by the overcoat ink layer forming main element is reduced. Also, the gloss adjusting material 21 having an average particle size smaller than 2.0 μm is not readily available at present and is difficult to prepare. The content of the gloss adjustment member 21 in the overcoat ink layer 14, the gloss of the overcoat ink layer 14, in an amount such that the same gloss as the base ink layer 12, is about to be suitably determined .

  Further, as is clear from the above description, it is desirable that the overcoat ink layer 14 be as thin as possible in order to prevent its presence from being easily recognized. However, if it is too thin, when the gloss adjusting material 21 is contained, the holding power of the gloss adjusting material 21 in the overcoat ink layer 14 is reduced. Therefore, the thickness of the overcoat ink layer 14 is preferably set to a value in the range of about 2.0 to 6.0 μm in consideration of a desirable average particle diameter of the gloss adjusting material 21. .

  Thus, in the printed matter of the present embodiment, the base ink layer 12 that is printed on the printing surface 16 of the printing sheet 10 has a large number of halftone dots 18 in which the white pigment 20 is dispersed. A colorless overcoat ink layer 14 is partially printed and formed on the base ink layer 12, and a non-formation portion 22 of the overcoat ink layer 14 on the base ink layer 12 Since the image 24 that draws the image is composed, the printed surface 16 of the sheet 10 to be printed is rubbed with coins, so that the image 24 that draws the circle is reliably displayed and is more clearly visible. On the other hand, before the printing surface 16 of the printing sheet 10 is rubbed with coins, the visual recognition of the image 24 can be made more difficult. Therefore, it can be used very advantageously as a scratch-type printed material used for various lotteries, game cards, and the like.

  In such a printed matter, the configuration of the halftone dots 18 constituting the base ink layer 12 and the composition of each printing ink used for forming the base ink layer 12 and the overcoat ink layer 14 are optimized. Thus, the excellent actions and effects as described above can be effectively enjoyed at an even higher level.

  By the way, in the said embodiment, on the to-be-printed surface 16 of the to-be-printed sheet 10, the image 24 which draws (circle) is comprised by the overcoat ink layer non-formation part 22 by which the surface of the base ink layer 12 was exposed. However, for example, as shown in FIGS. 5 and 6, the overcoat ink layer in which the surface of the base ink layer 12 is coated with the overcoat ink layer 14 on the printing surface 16 of the printing sheet 10. An image 24 in which a circle is drawn can be formed by the formed portions 14. In FIGS. 5 and 6, and in FIG. 7 described later, the same reference numerals as those in FIGS. The explanation was omitted.

  That is, here, the white base ink layer 12 in which the white pigment 20 is dispersed inside is printed by halftone printing on the entire surface of the circular region in the center of the printing surface 16 of the printing sheet 10. It is composed of a large number of halftone dots 18 (not shown). A colorless and transparent overcoat ink layer 14 covers the inner peripheral portion of the base ink layer 12 in a ring shape on the inner peripheral portion between the center portion and the outer peripheral portion of the base ink layer 12. , Partially printed. Then, the center portion and the outer peripheral portion of the base ink layer 12 are not covered with the overcoat ink layer 14 and the surface of the base ink layer 12 is exposed, and the circular center side overcoat ink layer is not covered. A formed portion 26 and an outer peripheral overcoat ink layer non-formed portion 28 having a wide ring shape are respectively present. Thereby, it is a pattern corresponding to the ring shape of this overcoat ink layer 14 in the formation part of the overcoat ink layer 14 which coat | covers the surface of the base ink layer 12 on the to-be-printed surface 16 of the to-be-printed sheet 10. However, the image 24 in which the circle is drawn is constructed.

  Thus, in this embodiment, when the entire printing surface 16 of the printing sheet 10 is rubbed with coins, as shown in FIG. 7, in the formation portion of the overcoat ink layer 14 on the base ink layer 12. , Coins slide on the surface, so that no discoloration is possible. On the other hand, in the center side overcoat ink layer non-formation portion 26 and the outer peripheral side overcoat ink layer non-formation portion 28 on the base ink layer 12, the white pigment in the base ink layer 12 in which the metal of the coin is exposed. The surface portion of the base ink layer 12 exposed in the center-side and outer-periphery-side overcoat ink layer non-forming portions 26 and 28 is grayed from white to black or darkened by the scraped metal. It can be discolored. Then, on the printing surface 16 of the printing sheet 10, the image 24 that draws a circle is embossed inside the base ink layer 12 that has been discolored without any discoloration, It can be made to appear.

  Even in this embodiment, the base ink layer 12 is composed of a large number of halftone dots 18 in which white pigments 20 are dispersed, and the base ink layer 12 is colorless and transparent. Since the overcoat ink layer 14 is partially printed and formed, and an image 24 depicting a circle is formed by the portion of the base ink layer 12 where the overcoat ink layer 14 is formed, the same action as in the above embodiment is performed.・ Effects can be enjoyed effectively.

  In the embodiment, the gloss adjusting material 21 is dispersed in the overcoat ink layer 14 so that the gloss of the overcoat ink layer 14 and that of the base ink layer 12 are approximately the same. However, the gloss adjusting material 21 is not essential in the present invention.

  Furthermore, in the said embodiment, although the image 24 was comprised by the pattern which draws (circle), in addition to the pattern and figure other than (circle), various things, such as a character, a number, a pattern, a picture, are included in this image 24. Can be employed.

  Furthermore, it goes without saying that the number, formation position, and the like of the images 24 are not limited to those shown in the embodiment.

  Moreover, in the said embodiment, although the color of the base ink layer 12 was made white by the white pigment 20 contained in it, in addition to this white pigment 20 with respect to the printing ink which forms the base ink layer 12, By adding pigments of various colors, the base ink layer 12 can be made into a color other than white.

  Further, for example, a color layer having the same color as that of the base ink layer 12 is formed by printing on the entire printing surface 16 of the printing sheet 10, and the base ink layer 12 and the overcoat ink layer 14 are formed on the color layer. You may make it laminate | stack sequentially. This makes it more difficult to visually recognize both the base ink layer 12 and the overcoat ink layer 14, and provides an advantage that the image 24 can be concealed even more skillfully.

  In addition, the present invention can be implemented in various forms, and any of various embodiments relating to various changes, modifications, and improvements of the present invention adopted based on the knowledge of those skilled in the art. It should be understood that the present invention belongs to the category of the present invention without departing from the spirit of the present invention.

  In the following, some representative embodiments of the present invention will be shown and the features of the present invention will be further clarified, but the present invention is subject to any restrictions by the description of such embodiments. It goes without saying that it is not a thing.

  First, as a base material, 12 sheets to be printed made of a white rectangular flat plate made of paper and solidly coated with white ink on the entire surface were prepared.

  On the other hand, an ink resin composed of a polyester-based resin and a known solvent are blended at a blending ratio of ink resin: solvent = 10: 7 on a weight basis and mixed to prepare a colorless ink. A predetermined amount was prepared. Furthermore, a predetermined amount of white ink [trade name: U-Pet 450 White (manufactured by Mino Group)] containing titanium oxide in an amount of 30% by weight as a white pigment was prepared. Then, using the colorless ink and the white ink thus prepared, they were blended in a blending ratio of colorless ink: white ink = 10: 3 on a weight basis and mixed. Thus, a predetermined amount of printing ink having a final composition of titanium oxide: resin for ink: solvent = 3: 15.3: 48.3 on a weight basis was prepared, and this was used as a base ink layer formation. Printing ink was used. In this way, the ratio of the content of each of the resin for ink and the solvent, which is the main element for forming the base ink layer, is 316 parts by weight with respect to 100 parts by weight of the resin for ink, and the operation described later is performed. Thus, a base ink layer forming ink was prepared in which titanium oxide was contained in a proportion of 16.4% by weight in the base ink layer printed on the printing sheet. The average particle size of titanium oxide (white pigment) contained in the base ink layer forming ink was 0.35 μm.

In addition, a colorless ink [trade name: U-Pet931 Matte Medium (manufactured by Mino Group Co., Ltd.)] in which an ink resin composed of a polyester resin and a silica gel matting agent as a gloss adjusting material are mixed. A predetermined amount was prepared. And this colorless ink and the well-known solvent were mix | blended by the mixing | blending ratio of colorless ink: solvent = 10: 7 on the basis of weight, and were mixed. As a result, a predetermined amount of printing ink having a final composition of silica gel matting agent: resin for ink: solvent = 1: 10.25: 31.25 on a weight basis was prepared, and this was formed as an overcoat ink layer. Printing ink. Thus, the overcoat ink layer forming ink in which the ratio of the content of each of the ink resin and the solvent, which is the main component of the overcoat ink layer formation, is 305 parts by weight with respect to 100 parts by weight of the ink resin. Prepared. The average particle size of the silica gel matting agent contained in such an overcoat ink layer forming the ink (gloss adjustment material) was 3.9 .mu.m.

  Further, as a halftone dot film original for screen printing by the screen printing method, the halftone dot area ratio is the same value of 60%, but the number of screen lines is different from 65 lines, 85 lines, 100 lines, and 130 lines. 4 types of film originals to be printed and halftone dots having the same value of halftone dot area ratio of 70% but different screen line numbers from 65 lines, 85 lines, 100 lines and 130 lines are printed and formed. Print and form another four types of film originals and halftone dots having the same value with a dot area ratio of 90% but different screen line numbers from 65, 85, 100, and 130 lines. In addition, a total of 12 types of film manuscripts were prepared, including another 4 types of film manuscripts.

  Next, the 12 sheets to be printed prepared in advance, the base ink layer forming ink prepared as described above, the 300 mesh screen, and the 12 types of film originals prepared above. The base ink layer forming ink was halftone printed by a known screen printing method on a circular area of a predetermined size on the surface of the 12 sheets to be printed, and dried and solidified. As a result, base ink layers composed of a large number of halftone dots and having different halftone dot area ratios and screen line numbers from each other were printed and formed on the surface of 12 sheets to be printed.

  Subsequently, using the 12 printing sheets on which the base ink layer was printed, the overcoat ink layer forming ink prepared in advance, and the 300 mesh screen, the base ink on these 12 printing sheets The ink for forming the overcoat ink layer was solid-coated by a known screen printing method on the circular area at the center and the ring-shaped area at the outer periphery of the layer, and this was dried and solidified. Thereby, on the base ink layer on the surface of the 12 sheets to be printed, a circular center side overcoat ink layer part and a ring-shaped outer peripheral side overcoat ink layer part as shown in FIGS. Each of them was printed and formed, and a ring-shaped overcoat ink layer non-formation portion was provided. Thus, an image depicting a circle was formed at the overcoat ink layer non-formation portion.

  Thus, a base ink layer and an overcoat ink layer, which are composed of a large number of halftone dots and have different halftone dot area ratios and screen line numbers, are laminated on the surface. On the base ink layer, 12 printed materials were prepared in which an image depicting a circle consisting of a non-formed portion of the overcoat ink layer was provided.

  Then, each of the 12 printed materials thus produced was visually observed before rubbing the surface with coins to determine whether the image could be easily recognized. Thereafter, the surface of each printed material was rubbed with a coin to reveal an image, and whether or not the image at that time was clear was visually examined. The results are shown in Table 1 below. In Table 1, regarding the visual image recognition survey before rubbing the surface of the printed material with coins, it is possible to recognize that the image can be easily recognized, although it is difficult to recognize the image. The evaluation results were shown as Δ for those that were present, and ○ for those that were unable to recognize the image. In addition, regarding the investigation on the sharpness of the image after rubbing the surface of the printed material with a coin, the image is clear and A can be confirmed very clearly, and the image can be easily confirmed but is slightly unclear. The evaluation results are shown as B, where C is the image and the image is unclear and cannot be easily confirmed.

  As is clear from the results in Table 1, it is difficult or impossible to visually recognize the image before rubbing the surface with coins in all the twelve printed materials configured according to the present invention. It will be appreciated that the image can be clearly or easily confirmed after rubbing the surface with coins. For this reason, the printed matter configured in accordance with the present invention has excellent image concealment before the surface is rubbed with coins, and after the surface is rubbed with coins, the image appears clearly. It can be clearly recognized that it can be done.

It is a cross-sectional explanatory drawing which shows one Embodiment of the printed matter according to this invention, Comprising: It is a figure corresponded in the II cross section in FIG. It is II-II sectional explanatory drawing in FIG. FIG. 3 is a partially enlarged explanatory view in FIG. 2. It is a figure for demonstrating the use condition of the printed matter shown by FIG. 1, Comprising: The state which rubbed the surface of the printed matter with the coin and made the image appear is shown. It is a figure corresponding to FIG. 1 which shows another embodiment of the printed matter according to this invention. It is VI-VI cross-section explanatory drawing in FIG. FIG. 6 is a diagram for explaining a use state of the printed matter shown in FIG. 5, and shows a state in which an image appears by rubbing the surface of the printed matter with a coin.

Explanation of symbols

10 printing sheets 12 base ink layer 14 overcoat ink layer 16 surface to be printed 18 dot 20 white pigment 21 gloss adjustment member 22 overcoat ink layer non-formation portion 24 image 26 center side overcoat ink layer non-formation portion 28 the outer periphery Side overcoat ink layer non-formation part

Claims (7)

A base material whose surface is a printing surface;
Many printed and formed by halftone dot printing using an ink containing a white pigment composed of at least one of titanium oxide, barium sulfate, and calcium carbonate on the entire surface of the printed surface of the substrate. A base ink layer consisting of halftone dots,
On the base ink layer, an ink layer partially printed using a colorless ink containing a gloss adjusting material for adjusting gloss is formed, and a predetermined portion is formed by a formed portion or a non-formed portion on the base ink layer. An overcoat ink layer constituting the image of
The printed matter , wherein the gloss of the overcoat ink layer is adjusted by the gloss adjusting material so as to be the same gloss as the base ink layer . An overcoat ink layer forming main element for forming the overcoat ink layer on the base ink layer by solidifying the colorless ink used for the printing of the overcoat ink layer on the base ink layer; A solvent that dissolves the overcoat ink layer forming main element, and the ratio of the respective contents of the overcoat ink layer forming main element and the solvent in the colorless ink is the overcoat ink layer forming main element. The printed matter according to claim 1 , wherein the solvent has a value within a range of 10 to 350 parts by weight with respect to 100 parts by weight of the raw material. A base material whose surface is a printing surface;
Many printed and formed by halftone dot printing using an ink containing a white pigment composed of at least one of titanium oxide, barium sulfate, and calcium carbonate on the entire surface of the printed surface of the substrate. A base ink layer consisting of halftone dots,
An overcoat ink layer comprising an ink layer partially printed and formed using colorless ink on the base ink layer, and forming a predetermined image by a formed portion or a non-formed portion on the base ink layer When,
And an overcoat ink layer that forms the overcoat ink layer on the base ink layer by solidifying the colorless ink used for printing the overcoat ink layer on the base ink layer. And a solvent for dissolving the overcoat ink layer forming main element, and the ratio of the content of each of the overcoat ink layer forming main element and the solvent in the colorless ink is the overcoat The printed matter , wherein the solvent has a value in the range of 10 to 350 parts by weight with respect to 100 parts by weight of the ink layer forming main element . The printed matter according to any one of claims 1 to 3, wherein the number of screen lines of the halftone dots in the base ink layer is 85 to 120 lines. The printed matter according to any one of claims 1 to 4, wherein a dot area ratio in the base ink layer is 70% or more. The printed matter according to any one of claims 1 to 5 , wherein the base ink layer contains the white pigment in an amount of 5% by weight or more. The ink used for the printing formation of the base ink layer is solidified on the printing surface of the base material to fix the white pigment on the printing surface, and the base ink layer is placed on the printing surface. A base ink layer forming main element to be formed on the base ink layer forming solvent and a solvent for dissolving the base ink layer forming main element, and the ratio of each content of the base ink layer forming main element and the solvent in the ink, The printed matter according to any one of claims 1 to 6 , wherein the solvent has a value within a range of 10 to 350 parts by weight with respect to 100 parts by weight of the base ink layer forming main element. .

Images