JP6597018B2 - Printed matter - Google Patents

Description

  The present invention relates to a printed matter in which an image appears by rubbing the surface with a metal.

  A printed matter is applied to a lottery ticket, a game card, a scratch lottery, a postcard with a lottery, etc. having a lottery element, to which a scratch printing technique is applied in which an image appears when the surface is shaved. However, this method of cutting the surface has a problem that ink scum is generated, and it has been regarded as unusable as a sales promotion tool especially for food.

  Therefore, as a scratch printing technique that does not generate ink residue, a technique has been developed that allows an image to be raised and visualized by rubbing the surface with metal, as described in Japanese Patent Publication No. 6-78039. This technique is often referred to as “coin scratching” because a familiar coin is often used as the metal to be used. The principle of the coin scratch is that the surface of the scratch ink layer is applied to an ink (hereinafter referred to as “scratch ink”) that forms a layer (hereinafter referred to as “scratch ink layer”) in which an image emerges when rubbed with metal. Contains materials that are harder than the metal to be rubbed. A scratch ink layer having an image with or without the scratch ink is formed. When the surface of the scratch ink layer is rubbed with metal, the metal is scraped off and metal powder adheres to the surface of the scratch ink layer, thereby causing an image to appear depending on the presence or absence of the scratch ink.

  In printed matter that forms images based on the presence or absence of scratch ink such as line drawings using scratch ink as described above, the difference in gloss between the printing substrate and the image formed with scratch ink is large, so the viewing angle is changed, etc. Depending on how it is viewed, there is a drawback that an image printed on the printing substrate can be recognized before the printed surface is rubbed with metal.

  As a printed matter that prevents the printed image from being recognized before rubbing the surface of the scratch ink layer with metal, for example, a predetermined on a printing substrate as described in JP-B-7-257080 It is known that a scratch ink layer is uniformly formed in a region with a scratch ink, and an overprint varnish is formed thereon by separately coating portions constituting characters and images. In the printed matter with this configuration, the disadvantage that the printed image can be recognized in a state before the printed surface is rubbed with metal has been solved to some extent, but it is necessary to print an overprint varnish excessively. Has the disadvantages of becoming complicated and expensive.

  Printed matter that solves the drawbacks of the coin scratch technology that the image printed on the printing base material can be recognized and the cost becomes high before the printed surface is rubbed with metal as described above. As described in Japanese Patent No. 4319704, a printed matter in which a scratch ink layer having a difference in halftone dot density due to scratch ink was formed was developed. Since the printed matter is formed from scratch ink having a difference in halftone dot density, an overprint varnish is unnecessary, and a scratch ink layer having a difference in halftone dot density is formed by one printing using one plate. Therefore, it can be manufactured at low cost. Further, since the scratch ink layer is formed of a single scratch ink, it has a feature that it is difficult to recognize the recognition of an image printed in a state before the printed surface is rubbed with metal.

  However, substrates such as textiles, paper, or synthetic resins used for printed materials often contain fluorescent whitening agents to improve the color development of printed images, and the difference in halftone dot density. In the printed matter on which the scratch ink layer is formed, when the ultraviolet light is irradiated from the surface where the scratch ink layer is not formed, light emission from the fluorescent whitening agent is observed from the surface side where the scratch ink layer is formed. However, there is a new problem that an image formed by a difference in halftone dot density can be confirmed due to a difference in transmittance due to a difference in halftone dot density. Here, in this specification, the fluorescent whitening agent refers to a fluorescent agent that absorbs ultraviolet rays and emits visible light having a wavelength from purple to blue (including wavelengths of at least 400 nm to 450 mm).

Japanese Patent Publication No. 6-78039 Japanese Patent Publication No. 7-257080 Japanese Patent No. 4319704

  The present invention provides a printed matter in which it is difficult to confirm an image in a state before the image appears, and a clear image can appear by rubbing the printing surface with metal.

In the printed matter of the present invention, a scratch ink layer on which an image due to a difference in the dot density of the scratch ink is formed is formed on at least one surface of the substrate containing the optical brightener, and the surface of the scratch ink layer is formed on the surface of the scratch ink layer. A printed matter for visualizing the image by rubbing with a metal, wherein the scratch ink layer has a material having a hardness higher than that of the metal for rubbing at least the surface of the scratch ink layer in order to visualize the image; The fluorescent whitening agent in the scratch ink layer is formed using a scratch ink containing an agent, and the content of the material in the scratch ink layer is in the range of 50 wt% to 65 wt% in dry weight. The content of is in the range of 0.01 wt% or more and 5 wt% or less by dry weight .

  In the printed matter of the present invention, it is difficult to confirm the image before the image appears, and a clear image can appear by rubbing the printed surface with metal.

It is a figure explaining an example of the printed matter of the present invention. It is a figure explaining an example of the printed matter of the present invention. It is a figure explaining an example of the printed matter of the present invention. It is a figure explaining an example of the printed matter of the present invention. It is a figure explaining an example which confirms the image of the printed matter of this invention.

  Embodiments of the present invention will be described in detail below. In the drawings attached to the present specification, for the sake of illustration and ease of understanding, the scale and the vertical / horizontal dimension ratio may be appropriately changed or exaggerated from those of the actual product.

Embodiment As shown in FIGS. 1 and 3, the printed material 10 of this embodiment is a scratch ink in which an image due to a difference in halftone dot density is formed on at least one surface of a substrate 20 containing a fluorescent brightening agent. Layer 30 is formed. Further, the scratch ink layer 30 is formed using a scratch ink containing a material having a hardness higher than that of a metal used for visualizing an image and a fluorescent brightening agent.

By rubbing the surface of the printed material with a metal, the scratch ink layer 30 on which the image is formed is scraped off and the surface of the scratch ink layer 30 is colored with the scraped metal powder. In comparison, a portion composed of a high density halftone dot is darkly colored, and a portion composed of a low density halftone dot is lightly colored, so that an image formed by the difference in halftone dot density can be visually observed. become.
On the other hand, an image due to a difference in halftone dot density before being rubbed with metal is formed with scratch ink using the same material, so that it is difficult to visually recognize the image.

  In this specification, the “metal” used for rubbing to form an image formed by the difference in the halftone dot density of the scratch ink layer having a difference in the halftone dot density is included in the scratch ink. Any metal can be used as long as it is cut by a material having a hardness higher than that of the metal. In general, a material having a hardness higher than that of the metal used for the coin is selected on the assumption that a nearby coin such as a 5-yen coin or a 10-yen coin is used.

1. Base Material For the base material 20 of the printed matter of this embodiment, paper, plastic, or the like can be used. In general, printed materials often use a white base material in order to express a printed image clearly, and use a base material containing a fluorescent whitening agent in order to express the image more clearly. There are many cases.
For the base material 20 of the printed matter of this embodiment, paper containing an optical brightener, a plastic sheet or film, and the like can be used.

  The substrate 20 of the printed material of the present embodiment only needs to contain a fluorescent brightening agent, and is selected from papers added with the fluorescent brightening agent, or plastic sheets or films added with the fluorescent brightening agent. can do. Examples of the fluorescent whitening agent include fluorescein compounds, thioflavine compounds, eosin compounds, rhodamine compounds, coumarin compounds, imidazole compounds, oxazole compounds, triazole compounds, carbazole compounds, pyridine compounds, imidazolones. Series compounds, naphthalic acid derivatives, stilbene disulfonic acid derivatives, stilbene tetrasulfonic acid derivatives, stilbene hexasulfonic acid derivatives, and the like can be used.

2. Scratch Ink Layer As shown in FIGS. 1 and 3, the scratch ink layer 30 includes a portion 31 having a relatively high halftone dot density and a portion 32 having a relatively low halftone dot density. An image is formed by the portion 31 having a high halftone dot density and the portion 32 having a low halftone dot density. Here, in FIG. 1, for the sake of simplification, the halftone dot density is binarized and displayed. However, the halftone dot density may have a multi-level density difference of two or more. A density difference may be formed in stages.

  When the surface 31 of the scratch ink layer 30 is rubbed with a metal, the portion 31 having a high halftone dot density and the portion 32 having a low halftone dot density are compared. The portion 32 having a darker halftone dot density is relatively lightly colored because the amount of metal to be shaved is small. Due to the difference in coloring, an image formed by the difference in halftone dot density is visualized.

  FIG. 2 is a view of the printed matter 10 of this embodiment observed from the surface side on which the scratch ink layer 30 is formed. In the printed material 10 of this embodiment, the scratch ink layer 30 may be formed on the entire surface of the base material 20 or may be formed on a part of the base material 20. In addition, the scratch ink layer 30 may be directly formed on the base material 20, and an image layer or an adhesion layer formed of one or more layers between the base material 20 and the scratch ink layer 30. Etc. may be formed.

  As shown in FIG. 2, even when the printed material 10 of this embodiment is observed from the surface side where the scratch ink layer 30 is formed before the surface of the scratch ink layer 30 is rubbed with metal, the difference in halftone dot density is observed. Although the formed image cannot be visually observed, when the surface of the scratch ink layer 30 is rubbed with metal, the metal shavings are reflected on the surface of the scratch ink layer 30 due to the difference in the dot density shown in FIG. Since it adheres, an image similar to the difference in the halftone dot density shown in FIG. 3 becomes visible.

2-1. Scratch ink The scratch ink layer 30 of the present embodiment uses a scratch ink containing at least a material harder than the metal that rubs the surface of the scratch ink layer in order to visualize the image, and a fluorescent brightening agent. Is formed.

  It is preferable to use powders such as titanium oxide, aluminum oxide, silicon dioxide and chromium oxide as the material having a hardness higher than that of the metal rubbing the surface of the scratch ink layer. These materials only need to be harder than the metal used in the coins that are supposed to rub against the surface of the scratch ink layer, and other metal oxides can also be used. From the viewpoint of price and availability, it is more preferable to use titanium oxide powder.

  The particle size of the powder of material that is harder than the metal that rubs the surface of the scratch ink layer contained in the scratch ink satisfies the conditions such as ease of making ink, ink stability, and metal scraping condition. , Preferably in the range of 0.3 μm or more and 25 μm or less. When the particle diameter is larger than 25 μm, the ease of ink production and the ink stability are lowered. If it is smaller than 0.3 μm, the degree of metal shaving will be reduced, making it difficult to visualize the image.

  The material having a hardness higher than that of the metal that rubs the surface of the scratch ink layer is preferably contained in the scratch ink layer 30 in a range of 30 wt% to 70 wt% in terms of dry weight, preferably 50 wt% to 65 wt%. When it is, since visualization performance improves more and peeling becomes difficult to generate | occur | produce, it is further more preferable. If it is 30 wt% or less, it becomes difficult to visualize the image, and if it is 70 wt% or more, peeling tends to occur when the surface of the scratch ink layer is rubbed with a metal.

Examples of the fluorescent brightening agent contained in the scratch ink layer 30 of the present embodiment include a fluorescein compound, a thioflavine compound, an eosin compound, a rhodamine compound, a coumarin compound, an imidazole compound, an oxazole compound, and a triazole compound. Carbazole compounds, pyridine compounds, imidazolone compounds, naphthalic acid derivatives, stilbene disulfonic acid derivatives, stilbene tetrasulfonic acid derivatives, stilbene hexasulfonic acid derivatives, and the like can be used. The fluorescent brightening agent is preferably contained in the scratch ink layer 30 in a range of 0.01 wt% to 5 wt% in terms of dry weight. If it is 0.01 wt% or less, the concealing effect by the scratch ink layer 30 is lowered, and if it is 5 wt% or more, the effect of the optical brightener reaches saturation, which is not preferable from the viewpoint of cost. Further, when the fluorescent brightening agent is contained excessively, a phenomenon called concentration quenching occurs, and the whiteness may be decreased.

  The surface where the scratch ink layer is formed by irradiating ultraviolet light from the surface where the scratch ink layer is not formed as shown in FIG. 5 because the fluorescent whitening agent is contained in the scratch ink layer within the above range. When viewed from the side, as shown in FIG. 4, it is not possible to observe an image formed by a difference in halftone dot density.

2-2. Method for Forming Scratch Ink Layer The scratch ink layer 30 of this embodiment can be formed by any method of offset printing, letterpress printing, gravure printing, and silk screen printing.

  By setting the halftone dot difference in the range of 20 to 50%, it is difficult to confirm the image formed due to the halftone dot difference in the state before rubbing the surface of the scratch ink layer with metal. A clear image can appear by rubbing the surface of the ink layer with metal.

  With regard to the screen for forming a halftone dot used in producing a printing plate for forming an image due to a difference in halftone dot density in the silk screen printing method, the number of lines is arbitrary, but by printing Since it is necessary to accurately reproduce the halftone dots, it is preferable to use a relatively coarse screen having 80 to 154 lines / inch. When printing an image with halftone dots, an image due to a difference in halftone dot density can be formed by changing the halftone dot density using a screen having the same number of lines.

  When forming an image by the difference in halftone dot density by the offset printing method, the halftone dot density may be changed by one plate as in the case of the screen printing, and two types of plates having different halftone dot sizes are used. You may do it.

EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated further in detail, this invention is not limited to the following Example at all.

A printed matter using scratch printing was prepared as follows.
<Base material>
A white PET sheet having a thickness of 100 μm and containing 1 wt% of a stilbene disulfonic acid derivative was prepared as a base material for printed matter using scratch printing.

<Scratch ink>
Titanium oxide having an average particle diameter of 5 μm was prepared as a material having a hardness higher than that of the metal rubbing the surface of the scratch ink layer. In addition, a stilbene hexasulfonic acid derivative was prepared as an optical brightener.

  There are five ways to contain the titanium oxide in a dry weight of 25 wt%, 30 wt% (lower limit), 50 wt%, 70 wt% (upper limit), 75 wt%, and the fluorescent brightener in a dry weight of 0.005 wt%, 0.01 wt%. (Lower limit) 2 types of ink containing 25 wt%, 5 wt% (upper limit), and 7 wt% were combined, and 25 types of inks were combined and evaluated.

  As shown in Table 1, the concentration of titanium oxide was. Good results were obtained with scratch inks in the range of 30 wt% (lower limit) to 70 wt% (upper limit) and the concentration of fluorescent brightener in the range of 0.01 wt% (lower limit) or more.

10 Printed Material 20 Base Material 30 Scratch Ink Layer 31 High Density Region 32 Low Light Density Region

Claims (1)

On at least one surface of the substrate containing the optical brightener, a scratch ink layer on which an image due to the difference in the dot density of the scratch ink is formed is formed, and the surface of the scratch ink layer is rubbed with a metal. A printed material that visualizes an image,
The scratch ink layer is formed by using a scratch ink containing at least a material harder than the metal that rubs the surface of the scratch ink layer to visualize the image, and a fluorescent brightening agent ,
The content of the material in the scratch ink layer is in the range of 50 wt% to 65 wt% in dry weight, and the content of the fluorescent brightener in the scratch ink layer is 0.01 wt% in dry weight A printed matter characterized by having a range of 5 wt% or less .

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