JPH0764113B2 - Anti-counterfeit printed matter and manufacturing method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed matter required to prevent forgery and falsification of banknotes, passports, securities, cards and the like, and a method for producing the same.

[0002]

2. Description of the Related Art Banknotes, passports, securities, cards and the like are required to be difficult to counterfeit or falsify. As a visual forgery prevention measure, there are known ones using the density of halftone dots and those applying moire. In addition, as disclosed in Japanese Patent Publication No. 56-19273,
It is known that the latent image can be confirmed by viewing the intaglio line from a certain direction.

[0003]

Many of the anti-counterfeit measures described in the prior art can be duplicated in a photolithographic manner, and it is difficult to complete the anti-counterfeit measures. The present invention, unlike these conventional techniques, can recognize a unique moire only when viewed from a certain specific angle, and it is extremely difficult to forge and falsify by color copying or a photographic method.
It is an object of the present invention to provide a printed matter with a high anti-counterfeiting and tampering prevention effect and a manufacturing method thereof, which enables anyone to determine the authenticity.

[0004]

[Means for Solving the Problems] In order to achieve the above-mentioned object, offset printing is performed on a line formed by color ink with straight lines, wavy lines, concentric lines, etc. Intaglio printing is performed by changing the angle of the lines of lines that are the same or different from the lines used for offset printing with ink. This print is only when viewed from a certain angle
Can recognize unique moire. There are two ways to obtain this printed matter. One is a method in which an image line composed of colored lines is offset printed first, and after the ink is completely dried, an intaglio image line composed of colorless and transparent lines is printed.
On the other hand, the intaglio line consisting of colorless and transparent lines is printed first,
This is a method in which the ink lines consisting of colored lines are offset-printed after the ink is completely dried.

When intaglio printing is performed with colorless transparent ink on an image line formed by offset printing formed by lines having a constant interval, such as colored straight lines, wavy lines, and concentric lines, an intaglio image line is a kind. It plays the role of a lens, and the position of the image lines due to offset printing looks slightly different when the printed matter is viewed obliquely and when viewed from the front.By printing at different angles, it is possible to print from a specific angle. Only when you see it, you can recognize the unique moire. On the other hand, on the contrary, when the colorless and transparent intaglio printing consisting of lines is performed first, the lines of the offset printing consisting of colored lines printed on the intaglio line are printed higher than the printing paper surface. , When viewed from an oblique direction, it appears to be slightly shifted, and the transferability of offset ink to printing paper and the transferability to the colorless transparent intaglio ink image line are different, and the transfer amount to the colorless transparent intaglio ink image line is slightly large. Therefore, the density of the offset ink on the colorless and transparent intaglio ink image line becomes high, and moire occurs. As the colorless and transparent intaglio ink, it is necessary that the vehicle has high transparency, UV and EB curable inks containing acrylate as a main component are suitable, and in order to further improve printability, refraction of acrylate A colorless and transparent intaglio ink can be obtained by adding an extender pigment having a refractive index similar to the refractive index.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. An image line composed of straight lines 1 shown in FIG. 1 (a) is offset-printed using a colored ink and completely dried, and then the image line of FIG. 1 (a) is obtained as shown in FIG. 1 (b). On the other hand, an image line composed of straight lines 2 whose angle was slightly changed was intaglio printed with a colorless transparent ink. As shown in FIG. 2, the obtained printed matter 3 can only see the straight lines 1 that are offset-printed using the colored ink when viewed from the front, but when viewed from an oblique direction, moire 4 occurs as shown in FIG. Also,
On the contrary, after the intaglio printing of the line consisting of the straight lines 1 and 2 with the colorless transparent ink, the line consisting of the straight lines 1 is offset-printed using the colored ink by slightly changing the angle with respect to the lines. did. When viewed from the front of the obtained printed matter 3, only the straight line 1 which is a colored image line can be seen, but when viewed from an oblique direction, moire 4 as shown in FIG. 3 was generated.

[0007]

As described above, in a product requiring anti-counterfeiting such as banknotes, passports, securities, cards, etc., tampering prevention and authenticity judgment, only when viewed from a certain direction, Since a recognizable moire can be formed, a printed matter that is extremely difficult to forge and falsify can be obtained. A copy such as a color copy forms a complicated moire, and the authenticity can be easily determined depending on whether or not the moire is generated depending on the viewing angle. As described above, it is difficult to reproduce the effect of the printed matter produced by combining the image lines made of the colored lines and the image lines made of the colorless and transparent lines with a copying machine and photoengraving. It is very effective as a counterfeiting and tampering prevention measure for banknotes, passports, securities and cards.

[Brief description of drawings]

FIG. 1 is a diagram showing each straight line used in Examples.

FIG. 2 is a diagram showing an example of a printed matter viewed from the front.

FIG. 3 is a diagram showing an example of a printed matter viewed from an oblique direction.

[Explanation of symbols]

 1 Straight line 1 2 Straight line 2 3 Printed matter 4 Moire

Claims (4)

[Claims] 1. An intaglio printing of lines of various lines with colorless transparent ink after offset printing of lines of various lines of colored ink and completely drying the ink. A printed material characterized by being overprinted with. 2. An intaglio printing of lines of various lines with colorless transparent ink after offset printing of lines of various lines of colored ink and completely drying the ink. A method for producing a printed matter, which comprises overprinting with. 3. An intaglio printing of various lines made of colorless and transparent ink, after completely drying the ink, the angle of the lines is changed and the lines made of various lines are offset printed with colored ink. A printed material characterized by being overprinted with. 4. An intaglio printing of lines of various lines made of colorless and transparent ink, after completely drying the ink, the lines of various lines are offset printed with colored ink by changing the angle of the lines. A method for producing a printed matter, which comprises overprinting with.