JPH10114181A - Printed matter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printed matter with a picture hardly recognizable in the state before the picture appears but a vivid picture can appear by rubbing the printed surface with a coin, etc., by printing a picture on a printing substrate with halftone dots using an ink including a material having a larger hardness with respect to the metal used in the coin. SOLUTION: A picture including an image 1 with large halftone dots 3a and a background 2 with small halftone dots 3b is printed on a printing substrate 4 using an ink including a material having a larger hardness with respect to the metal used in a coin. Since the gloss difference of the printing substrate 4 surface is small in a printed matter with such a configuration, it is difficult to recognize the picture, but the picture can appear vividly by rubbing the printed surface with a coin, etc. The halftone dot concentration difference between the image 1 and the background 2 is preferably set in the rang of 20 to 50%. Furthermore, by having the halftone dot concentration of the image 1 larger than the halftone dot concentration of the background 2, a thick tone image 1 can appear conspicuously from a thin tone background 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed matter in which a picture appears by rubbing a surface with a coin.

[0002]

2. Description of the Related Art Conventionally, as for a printed matter in which a pattern appears by rubbing the surface with a coin, for example, Japanese Patent Publication No. 6-780.
As described in No. 39, by forming a pattern such as a line drawing with an ink composition containing a material having a higher hardness than the metal of a coin on a printing substrate, and rubbing the pattern with a coin,
A printed material is known in which the printed portion is colored with a metal of a shaved coin and a pattern appears, but in this printed material, since the difference in gloss between the printed base material and the pattern is large, the viewing angle is changed depending on the perspective. However, there is a drawback that a pattern printed on a printing base material can be recognized before the printed surface is rubbed with coins. Further, as a printed material that prevents a printed pattern from being recognized before rubbing a printing surface with a coin, for example, a printed material such as described in Japanese Patent Publication No. 7-257080 It is known that a predetermined area is uniformly printed with an ink composition containing a material having a hardness higher than that of a coin metal, and an overprint varnish is printed on the ink composition so that portions constituting characters and patterns are separately painted thereon. ing. In the printed matter of this configuration, the drawback that the printed pattern can be recognized before the printed surface is rubbed with coins has been solved to some extent. However, there is a disadvantage that the cost becomes high and the cost becomes high.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to make it difficult to confirm a picture before the picture appears, and to make a clear picture appear by rubbing a printed surface with a coin. An object of the present invention is to provide a low-cost printed material that can be produced.

[0004]

According to the present invention, there is provided a printed material characterized in that a pattern consisting of halftone dots is printed on a printing substrate using an ink containing a material having a hardness higher than that of a coin. Thereby, in a state before the pattern appears by rubbing with a coin or the like, it is difficult to recognize the printed pattern, and when the printing surface is rubbed with a coin or the like, the dot portion is colored and the pattern can appear clearly. Things.

[0005] In the above printed matter, by forming the picture with an image and a background printed with different halftone dots, the printed picture becomes difficult to recognize before rubbing with a coin or the like. And by rubbing it with coins,
It is possible to make a picture with an image appearing in the background appear.

In the above printed matter, the difference between the halftone dot density forming the image and the halftone dot density forming the background is 20 to
By setting it to 50%, the printed pattern becomes more difficult to recognize before rubbing with a coin or the like, and a clear pattern consisting of a background and an image can be made to appear by rubbing with a coin or the like.

In the printed matter described above, by making the halftone dot density forming the image larger than the halftone dot density making up the background, a dark color image can be embossed on a light color background.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing an embodiment of a printed matter of the present invention, FIG. 2 is a sectional view showing a halftone dot in the embodiment, FIG.
FIG. 4 is a view showing another embodiment of the printed matter of the present invention, FIG. 4 is a view showing various halftone dot densities, 1, 1 ′ is an image, 2, 2 ′ is a background, 3a, 3b are halftone dots, Reference numeral 4 represents a printing substrate.

As shown in FIG. 1, an embodiment of the printed matter of the present invention uses a net having a high dot density by using an ink containing a material having a hardness higher than that of a coin on a printing substrate such as paper. This is a printed matter on which a picture composed of an image 1 composed of dots and a background 2 composed of halftone dots having low halftone density is printed. By configuring the image 1 and the background 2 as described above, the difference in the gloss of the surface of the printing substrate between the image 1 and the background 2 is reduced, so that even when the printed material is viewed at different viewing angles, It is possible to make it difficult to recognize whether a special pattern is printed. By rubbing the printing surface with a coin or the like, a clear pattern composed of the image 1 and the background 2 can be made to appear.

The halftone dots of the image 1 and the background 2 in the above embodiment, printed using an ink containing a material having a hardness greater than that of the coin metal, are as shown in FIG. On the other hand, an image 1 composed of large halftone dots 3a and a background 2 composed of small halftone dots 3b are printed. That is, the image 1 and the background 2 are composed of halftone dots having different densities, that is, halftone dots 3a and 3b having different sizes. By rubbing the printed surface with coins or the like in this state, the metal such as coins is scraped off at the dots 3a and 3b and the dots 3a and 3b are colored, so that the image 1 composed of large dots is dark. The background 2 which is colored and composed of small dots is lightly colored.
Therefore, the image 1 and the background 2 are colored at different densities, and a clear pattern appears.

Another embodiment of the printed matter of the present invention is as shown in FIG. 3, in which a halftone dot is printed on a printing substrate 4 such as paper by using an ink containing a material having a hardness higher than that of a coin. An image 1 'composed of halftone dots with low density and a background 2' composed of halftone dots with high density are printed matter. Even in the case of this configuration, there is no difference in the gloss of the surface of the printing base material 4 between the image 1 'and the background 2'. Therefore, even when the viewing angle is changed, what kind of pattern is on the printing base material 4 It is difficult to recognize whether it is printed. By rubbing the printed surface with coins or the like, a clear pattern in which a light image 1 'emerges in a dark background 2' can appear.

The various dot densities are as shown in FIG. 4, and the dot density indicates the ratio of the area of the dot to the total area. And the area of the halftone dot is equal to the area of the portion without the halftone dot. A dot density of 100% is completely solid. Halftone density of 10% and 90%, halftone density of 20% and 80%, halftone density of 30%
And 70%, and the halftone dot densities of 40% and 60% are states in which the areas of the halftone dot and the area without the halftone dot are reversed. Further, when a picture is composed of halftone dots, the picture may be represented by a plurality of halftone dots of different sizes, and by doing so, a picture with gradation can be obtained by rubbing with a coin or the like and coloring. be able to.

As the halftone dot density, images 1, 1 'and backgrounds 2, 2'
Can be set arbitrarily within the range of halftone density that can be reproduced by printing, both when the halftone density is high or when the halftone density is low, but the image 1, 1 'and the background 2, 2' By setting the halftone dot density difference in the range of 20 to 50%, it is difficult to confirm the pattern formed on the printing base material 4 before the pattern appears, and rub it with a coin or the like. This makes it possible to make clear patterns appear. Regarding a screen for forming a halftone dot used when producing a printing plate for printing a picture, the number of lines is arbitrary, but since it is necessary to accurately reproduce the halftone dot by printing, a line is required. It is preferred to use a relatively coarse screen with a number of 80 to 154 lines / inch. When a picture is printed with halftone dots, the image 1 and the background 2 can be constructed by changing the halftone density by using a screen having the same number of lines, or a portion having a high halftone density can be determined by the number of lines. May be used to print a pattern composed of the patterns 1, 1 'or the backgrounds 2, 2' using a screen with a small number of lines in a portion having a low halftone dot density.

In the present invention, titanium oxide, aluminum oxide, silicon dioxide, chromium oxide, and the like can be used as a material having a hardness higher than that of a coin used in the ink for printing a picture in the present invention. Table 1 shows the Mohs hardness of these materials. Table 2 shows the Mohs hardness of metals commonly used as coin materials.

[0015]

[0016]

Printing using an ink containing a material having a higher hardness than the metal of a coin can be performed by any of offset printing, letterpress printing, gravure printing, and silk screen printing. The proportion of the material having a hardness higher than that of the coin metal in the ink containing the material having a hardness higher than that of the coin metal is suitably from 10 to 80%. When the proportion of the material having a hardness higher than that of the metal of the coin is 10% or less, the degree of the metal of the coin being scraped off by the printed halftone dots is small and coloring is insufficient. As the printing substrate, it is preferable to use a printing substrate which does not include a material having high hardness such as titanium oxide, aluminum oxide, silicon dioxide, and chromium oxide.

The printed matter of the present invention is used for printing a pattern such as an image, a character, or a figure on a printing substrate surface, forming a concealing film capable of concealing the pattern on the printed base material, and rubbing the concealing film with friction.
As a substitute for the so-called scratch card, which was peeled off by scratching and appeared patterns such as images, characters, figures, etc., use for books for infants and children, flyers, etc. By using a one-point mark on the entire surface other than the ruled lines and on the corners, etc., in order to use it as a direct mail with printed `` round '', `` outside '', etc., and to prevent copying of important documents, For example, it can be used for anti-counterfeiting purposes, such as making it possible to discriminate between documents.

Example 1 A printing plate for offset printing using a screen having 120 lines / inch and having a background halftone density of 20% and a character image having a halftone density of 60%. Was prepared. Using the above printing plate, a non-colored UV offset ink of the following composition containing a material having a higher hardness than the metal of the coin is used to prepare 70 kg of 46 kg high quality paper (Oji Paper,
Royal NIP), using the offset printing method, where the background dot density is 20% and the image dot density is 60%
Was produced. The obtained printed matter is in a state before coloring, it is difficult to recognize the pattern formed on the printing substrate even if the viewing angle is variously changed, and from a dark character on a light background by rubbing with a coin A clear image appeared. [Composition of UV offset ink (% by weight)] Titanium oxide 51% Polyester acrylate 32% Acrylic monomer 10% Photosensitizer 3% Auxiliary 4%

Comparative Example 1 A printing plate for offset printing, in which the background halftone density is 0% and the halftone density of an image composed of characters is 100%, that is, a solid version of a character image is prepared and implemented. A printed matter was produced in the same manner as in Example 1. The printed matter obtained was colored by rubbing with a coin to obtain a clear picture, but the pattern printed before rubbing with a coin could be confirmed, so that a favorable result was not obtained.

[0021]

According to the present invention, a printed matter having a pattern consisting of halftone dots printed on a printing base material using an ink containing a material having a hardness greater than that of a coin is rubbed with a coin or the like. In the state before the appearance, the printed pattern is difficult to recognize, and a halftone dot portion is colored by rubbing the printed surface with a coin or the like, so that a clear pattern can appear. In the above printed matter, the picture is constituted by the image and the background printed with different halftone dots respectively, so that the printed picture becomes difficult to recognize before being rubbed with a coin or the like, and the coin or the like. By rubbing, a pattern in which an image is raised in the background can appear. In the above printed matter, by setting the difference between the halftone dot density constituting the image and the halftone dot density constituting the background to be 20 to 50%,
Before rubbing with a coin or the like, the printed pattern becomes more difficult to recognize, and by rubbing with a coin or the like, a clear pattern consisting of a background and an image can be made to appear. In the printed matter described above, by setting the halftone density of the image to be higher than the halftone density of the background, a dark color image can be embossed on a light background.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of a printed matter of the present invention.

FIG. 2 is a sectional view showing a halftone dot in the embodiment.

FIG. 3 is a view showing another embodiment of the printed matter of the present invention.

FIG. 4 is a view showing various halftone dot densities.

[Explanation of symbols]

 1, 1 'image area 2, 2' background area 3a, 3b halftone dot 4 printing substrate

Claims (4)

[Claims] 1. A printed matter, wherein a pattern consisting of halftone dots is printed on a printing substrate using an ink containing a material having a hardness higher than that of a coin. 2. The printed matter according to claim 1, wherein the picture is composed of an image printed with different halftone dots and a background. 3. The printed matter according to claim 2, wherein a difference between a halftone density forming the image and a halftone density forming the background is 20 to 50%. 4. The printed matter according to claim 2, wherein a halftone density constituting the image is higher than a halftone density constituting the background.