JP2003195764A - Label - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a label which permits easy and rapid discrimination of authenticity. <P>SOLUTION: The label is printed by using printing ink having a difference in IR absorptivity and is characterized in that a color difference ΔE*ab in a visible region of a printed section is below 6. Both of printed 18a and 18b can be recognized in a visible region but only the printed 18a is recognized in an IR region, by which the authenticity of the label can be easily and rapidly discriminated. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a label which can easily determine the authenticity of a printed label.

[0002]

2. Description of the Related Art Conventionally, in order to solve the problem that a great deal of manpower is required to determine the authenticity of a label, it is transparent and invisible in the visible light region (visible region).
There is a prize application label that has barcodes and marks printed with fluorescent ink that can be identified by irradiating infrared rays (Japanese Patent Laid-Open No. 2001-222225), and barcodes and marks made with invisible ink can be reproduced with color copies. Since it is impossible, certain effects such as eliminating and preventing counterfeit products can be expected.

[0003]

However, since the bar code or mark is only detected by infrared rays in the prize application label or the like, such bar code or mark is once printed. Knowing that, it's easy to print such a barcode or mark, so
There is a problem that a counterfeit product can be manufactured relatively easily. Also, since such barcodes and marks are not visible in the visible range, when it is necessary to make the barcodes and marks visible, it is necessary to print with another ink, which is a double labor. There is also a problem that it costs.

Therefore, a main object of the present invention is to use an ordinary printing ink and to have an effect that all the printed parts can be recognized in the visible range and a specific printed part can be recognized in the infrared range.
The purpose of the present invention is to provide a label that can distinguish its authenticity in a short time, is difficult to produce a counterfeit product, and has excellent cost performance.

[0005]

The inventor of the present invention has found that ordinary printing is performed.
Some inks have different infrared absorption characteristics.
In view of this, the present invention has been achieved. That is, the present invention
The label according to claim 1 has an infrared absorption rate in the infrared region.
Labels printed with different printing inks
, The color difference ΔE in the visible range of the printing section ^*ab is 6 or less
It is a label characterized by that. According to claim 2 of the present invention
The label on the label is ink and red that do not substantially absorb infrared rays.
A line printed with an ink that substantially absorbs external rays.
It is a bell, and in the visible range
Color difference ΔE^*Label having ab of 6 or less
Is.

The above-mentioned objects, other objects, features and advantages of the present invention will be more apparent from the following detailed description of the embodiments of the invention.

[Detailed Description of the Invention] An embodiment of a label according to the present invention will be described below.

As a dye which does not substantially absorb infrared rays, for example, diazo yellow AAMX (CI Pig
ment Yellow 13 (yellow), Lake Red C
(CIPIment Red 53: 1 (gold red)),
Brilliant Carmine 6B (CI Pigment R
ed 57: 1 (red), Phthalocyanine Blue G (C
I Pigment Blue 15: 3 (indigo) and the like. An ink that does not absorb infrared rays of a desired color (hereinafter referred to as “infrared non-absorption ink”) is prepared by mixing these dyes and the like.

Next, an ink containing one or more infrared absorbing agents that absorbs infrared rays (hereinafter referred to as "infrared absorbing ink") has the same color as the non-infrared absorbing ink, that is, the color difference between the two inks is less than a predetermined value. Adjust so that Examples of the infrared absorber include carbon black and KAYASORB IR-750 manufactured by Nippon Kayaku Co., Ltd., and IR
-820 (B), the same IRG-002, the same IRG-02
2, the same CY-10, etc. Since there is a restriction that a material that absorbs infrared rays cannot be used for the infrared non-absorption ink, it is desirable to adjust the color of the infrared non-absorption ink first, but the opposite case is not hindered. By adjusting both inks in this way, it becomes difficult to distinguish between the two printing portions not only by normal visual observation in the visible range but also by staring. Here, the color difference refers to a color difference based on the L ^* a ^* b ^* color system and is calculated by the following formula. The lightness is represented by L ^* , and the chromaticity indicating hue and saturation is represented by a ^* and b ^* . ΔE ^* ab = [(ΔL ^* ) ² + (Δa ^* ) ² + (Δb ^* ) ² ]
^1/2 Here, ΔL ^* , Δa ^* , and Δb ^* are the differences between L ^* , a ^* , and b ^{* in} the printed portion of the infrared non-absorption ink and the infrared absorption ink. If ΔE ^* ab is made small, it becomes difficult to identify both printed portions not only by visual observation but also by gazing. As the value, ΔE ^* ab is 6 or less. More preferably, it is 3 or less.

In other words, if the ΔE ^* ab is small, the printed portion consisting of repeated marks, patterns, character strings, etc., will be recognized in the same way even if they are stared in the visible region, and the infrared portion in the infrared region is recognized. Only the part printed with absorbing ink is recognized, and repeated marks, patterns, which are different from the visible range,
Character strings will be accepted. Therefore, the authenticity of the label can be determined by examining the marks, patterns, character strings, etc. that are repeated in the visible range and the infrared range.

For example, a part (printing part in FIG. 3) of printing consisting of repeated marks, patterns, character strings and the like as shown in FIG. 2 is printed with infrared absorbing ink, and the rest is printed with infrared non-absorbing ink. Produce labels. This label looks the same in both visible areas when staring in the visible range (FIG. 2), but looks like FIG. 3 in the infrared range. Therefore, the authenticity of the label can be determined by examining the marks, patterns, character strings, etc. that are repeated in the visible range and the infrared range. Although the example of using infrared absorbing ink for some of the repeated marks, patterns, character strings, etc. has been described above, it is also possible to determine the authenticity of the label by printing a part of the printed part of the label with infrared absorbing ink. Can be done similarly.

As a method of printing these inks, there are a letterpress printing method, a lithographic printing method, an intaglio printing method, a gravure printing method and the like, but the method is not limited to these.

A label using these inks is composed of a label base material, a pressure sensitive adhesive layer, a release liner, etc., but generally used label base materials, pressure sensitive adhesives, release papers, etc. are used. The structure and constituent materials are not particularly limited.

The label according to the present invention will be described below based on a specific example.

【Example】

As the infrared non-absorption ink, URV FL manufactured by T & K TOKA Co., which does not contain carbon black and is prepared in black color, is used. As the infrared absorbing ink, a black-colored infrared absorbing ink containing carbon black (T & K TOKA L Carton Black GW) and a yellow ink (T & K TO) are used according to the color of the above infrared non-absorbing ink.
KA company L carton yellow GW), blue ink (T & K
A mixture prepared from TOKA's L carton indigo GW) and medium (thinning solution) was used. Table 1 shows the ink composition ratio of the infrared absorbing ink.

[0016]

[Table 1]

Labels printed with these inks include a release paper having a basis weight of 60 g / m ² based on glassine paper as a release liner and a pressure-sensitive adhesive containing polymethyl methacrylate as a main component (Toyo Ink Co., Ltd.). Manufacturing Company B
PW4930) is applied so that the applied amount after drying is 20 g / m ^2, and dried.
A g / m ² cast coated paper was laminated. Then, the pattern of FIG. 2 was printed by letterpress printing. In FIG. 2, the portion corresponding to FIG.
The rest was printed with infrared non-absorbing ink.

Table 2 shows the colors of the two printing parts and their differences.

[0019]

[Table 2]

The color difference is measured by a colorimeter (Gretag Ma).
It was measured by a Spectro Eye of cbeth.
According to the values in Table 2, the color difference ΔE ^* ab is ΔE ^* ab = [(0.88) ² + (1.88) ² + (-0.
24) ² ] ^1/2, which is 2.09. The label was recognized in the visible range as shown in FIG. 2, and it was difficult to identify both prints even if both prints were stared at. According to the infrared reading device, the pattern in the state shown in FIG. 3 was recognized.

[0021]

[Comparative Example 1] Another "fake" label different from the present invention prepared using only the infrared non-absorbing ink was recognized in the visible range as shown in FIG. According to it, the pattern was not recognized.

[0022]

[Comparative Example 2] An infrared absorbing ink was used for the production.
Another "fake" label different from the present invention was recognized in both the visible range and the infrared reader as shown in FIG. Therefore, the authenticity of the label could be discriminated by confirming the difference in the pattern recognized in the visible region and the infrared region.

[0023]

EFFECTS OF THE INVENTION According to the label of the present invention, although it is the same as a normal label in the visible range, it looks different in the infrared range, so that it is difficult to forge a label and it is easy to discriminate the authenticity of the label. It can be carried out.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an embodiment of the present invention.

FIG. 2 is a diagram showing a print state recognized in a visible range according to an embodiment of the present invention.

FIG. 3 is a diagram showing a printing state recognized in an infrared region according to an embodiment of the present invention.

[Explanation of symbols]

10 labels 12 Release liner 14 Adhesive layer 16 Label base material 18a Printing section using infrared absorbing ink 18b Infrared non-absorption ink printing section 20 Print status recognized in the visible range 30 Print status recognized in the infrared region

Claims (2)

[Claims] 1. A label printed with a printing ink having a difference in infrared absorption in the infrared region, wherein the color difference ΔE ^* ab in the visible region of the printed portion is 6 or less. label. 2. A label printed using an ink that does not substantially absorb infrared rays and an ink that substantially absorbs infrared rays, wherein the color difference ΔE ^* ab in the visible region of the printed portion due to both inks is A label characterized by being 6 or less.