KR102594910B1 - Intaglio for security elements and security printed matter printed using the same - Google Patents

Abstract

The present invention relates to an intaglio plate including a plurality of pixels and forming a plurality of caustic lines, wherein the first recess of the pixel forming the first caustic line and the second recess of the pixel forming the second caustic line each have a depth gradient. , an intaglio for forming multiple security elements, wherein the first recess forming the first caustic line and the second recess forming the second caustic line have different depths, and a security intaglio printed using the intaglio and a security ink composition. Regarding printed matter, the security printed matter printed according to the present invention exhibits a gradient effect and different afterglow characteristics for each caustic line, thereby improving the security of the security printed matter.

Description

Intaglio for security elements and security printed matter printed using the same}

The present invention relates to an intaglio for forming multiple security elements and a security print printed using the same. More specifically, a depth gradient is formed in the pixels to have a gradient effect, and the depth of each caustic line is formed asymmetrically so that they are different from each other. The present invention relates to an intaglio plate capable of forming security elements having different colors and luminous durations, and to security prints printed using the same.

[Unique task number] KOM2021_07

[Ministry Name] Ministry of Strategy and Finance

[Research Management Institute] Korea Minting and Minting Corporation

[Research project name] Securing future leading technology and advancing forgery and forgery technology

[Research project name] Creating security ink and utilization solution IP for printing public security products

[Host organization] Korea Minting and Minting Corporation

[Research period] 2021. 1. 01 ~ 2022. 12. 30. (2 years)

Intaglio printing is a printing method that creates concave strokes on a metal plate, casts ink on the plate, fills the concave portions of the strokes with ink, wipes off excess ink on the intaglio plate, and transfers the ink to the paper with strong pressure. Typically, ink is filled in the concave part of a printing plate preheated to over 80 degrees Celsius, and the ink is transferred to the paper due to the high printing pressure and difference in surface energy, forming printing lines (caustic lines).

During intaglio printing, grooves are made in a thick metal plate, so the ink can be thicker. Intaglio is generally used by carving a metal plate, so it not only has excellent durability, but also allows the printing pattern to be formed in fine lines, making it a common material. It has advantages that cannot be imitated by any other method, so it is widely used to produce precision printing and anti-counterfeiting printed materials, and is also highly productive as it can print at high speeds of more than 6,000 sheets per hour.

In general, anti-counterfeiting methods are being implemented to achieve a copy prevention effect by using special inks, such as forming a different printing pattern during intaglio printing, adding metal powder to the printing ink, or using fluorescent ink. However, these methods are used for currency, oil, etc. It damages the dignity of securities or important documents and is insufficient in preventing forgery and alteration.

In addition, there is a possibility of producing counterfeit security products by purchasing special inks available on the market and printing security elements by using them instead of the special inks used in security elements, so their effectiveness may be low.

Accordingly, an intaglio printing method that can secure more improved security is needed.

Registered Patent No. 10-2012-0135779 (registered on December 17, 2012)

The present invention seeks to provide an intaglio for forming a multiple security element capable of forming a latent image and forming security elements with different colors and durations for each caustic line, and a security print printed using the same.

One embodiment of the present invention for achieving the above-described object is an intaglio that includes a plurality of pixels and is capable of forming a plurality of caustics including first and second caustics, wherein the first caustic line is formed. The first recess of the pixel forming the second caustic line and the second recess of the pixel forming the second caustic line each have a depth gradient, and the first recess forming the caustic line and the second recess forming the second caustic line have different depths, It relates to intaglio plates for forming multiple security elements.

The depth gradients of the first recess and the second recess may be different from each other or may be the same.

The depth of the first recess may be 10 to 50 μm.

The depth of the second recess is deeper than the depth of the first recess, and the difference between the lowest depth values of each of the first recess and the second recess may be at least 50㎛.

The multiple security elements may be at least one of letters, numbers, pictures, patterns, and patterns.

Another embodiment of the present invention relates to a security printed matter in which a plurality of caustic lines including first and second caustic lines are printed using an intaglio and a security ink composition according to an embodiment of the present invention.

The security ink composition may include a blue phosphor, a green phosphor, and a red phosphor.

At this time, due to the depth gradient formed in the intaglio, the first and second caustic lines of the security printout printed with the security ink composition may have a gradient effect of becoming darker or blurring, respectively.

In addition, the first caustic line printed with the security ink composition filled in the first recess and the second caustic line printed with the security ink composition filled in the second recess formed at a deeper depth compared to the first recess may have different afterglow characteristics. there is.

When irradiated with ultraviolet rays, the first and second caustics have a blue color. After the irradiation of ultraviolet rays is stopped, the first caustic line emits green and then goes out, and the second caustic line can emit green, yellow, and red in the order and then go out. there is.

The ultraviolet rays may have a wavelength range of 280 to 400 nm.

The depth of the first recess may be 10 to 50 μm.

The difference between the lowest depth values between the first recess and the second recess may be at least 50㎛.

The green phosphor may be ZnS:Cu phosphor, YAlO ₃ :Ce phosphor, or a mixture thereof.

The red phosphor may be a SrS:Eu phosphor.

The intaglio for forming a multiple security element of the present invention and the security print printed using the same have a gradient effect in which a depth gradient is formed in the pixels of the intaglio, and the depth of each caustic line is formed asymmetrically to emit different colors and light. It is possible to form a security element that has a duration.

1 is a schematic diagram of an intaglio for forming multiple security elements according to an embodiment of the present invention.
Figure 2 is a diagram briefly showing an intaglio plate in which two lines are formed.
Figure 3 is a diagram briefly illustrating a security print according to another embodiment of the present invention.
all.
Figure 4 is a graph illustrating the hourly luminescence intensity of the security ink composition before and after ultraviolet ray irradiation.

Before explaining in detail the preferred embodiments of the present invention below, the terms and words used in the specification and claims should not be construed as limited to their ordinary or dictionary meanings, but should be interpreted as meanings consistent with the technical idea of the present invention. Please note that it should be interpreted as a concept.

Throughout this specification, when a part "includes" a certain component, this means that it may further include other components rather than excluding other components, unless specifically stated to the contrary.

Throughout this specification, the meaning of “plural” refers to the number of at least two or more rather than the singular, and the prefixes “first” and “second” are used to refer to two specific components in a plural group, and the two groups. It does not mean that only an element exists, but that a total of two or more elements exist, including two specific elements.

Below, we will look at embodiments of the present invention. However, the scope of the present invention is not limited to the preferred embodiments below, and those skilled in the art can implement various modifications of the contents described in this specification within the scope of the present invention.

The present invention relates to an intaglio for forming multiple security elements and to security prints printed using the same.

More specifically, an intaglio that has a gradient effect by forming a depth gradient in the pixel, and the depth of each caustic line is formed asymmetrically to form a security element with different colors and emission durations, and a print using the same. It's about security printouts.

First, one embodiment of the invention relates to an intaglio for forming multiple security elements.

The intaglio 10 for forming a multiple security element according to an embodiment of the present invention includes a plurality of pixels 110 and forms a plurality of caustic lines 100.

Figure 1 is a schematic diagram of the intaglio plate 10 according to an embodiment of the present invention. In Figure 1, the intaglio plate 10 forming one flower line 100 is shown for convenience.

The caustic line 100 may be formed by one pixel 110, or two or more pixels 110 may be gathered to form one caustic line 100. In the drawing, a plurality of pixels 110 are shown to form one caustic line 100.

Here, the pixel 110 is an element or area forming the caustic line 100 and may refer to a piece of intaglio, and the caustic line 100 may refer to a concave portion of the intaglio 10 filled with ink.

Generally, “caustic lines” refer to a single dot, line or surface that is printed after filling the concave portion 120, which is a concave part of the intaglio plate 10, with ink. However, in the present invention, intaglio plates 10 for forming the caustic lines of printed matter are used. The concave part of is also defined as a “caustic line.”

The caustic line 100 may have a dot, line, or surface shape, and a single caustic line 100 may form one security element by itself, and two or more caustic lines 100 may form one security element. It could be.

As such, the security element formed by the lines 100 may be at least one of letters, numbers, pictures, patterns, and patterns.

The pixel 110, which can form one caustic line 100, includes a recess 120 that is concavely formed at a predetermined depth from the upper surface of the intaglio 10, and this recess 120 is filled with ink to form a security element. Can be printed. This recess 120 may be formed by cutting at least a portion of the pixel 110 through laser engraving.

The recess 120 is formed concavely to have a predetermined depth D from the upper surface of the intaglio plate 10, where the depth D is the height from the upper surface of the intaglio plate 10 to the height of the highest point of the recess 120. means distance. Accordingly, “shallow depth of field” means that the distance is short, and “deep depth” means that the distance is long.

The recessed portion 120 is formed to have a depth gradient, so that it can provide a gradient effect in which the color becomes darker or darker during printing. Since the brightness, saturation, or color gradually becomes darker or duller due to the gradient effect, the presence or absence of gradient or gradation can be determined. It is possible to check the authenticity of security prints according to the color gradient pattern.

In FIG. 1 , the depth gradient is illustratively shown as sloping from one end to the other end, but the aspect of the depth gradient is not limited to this.

Specifically, the starting point where the depth gradient begins and the end point where the depth gradient ends are not necessarily limited to the end, and the slope may be formed in a form connecting the end to the middle, the middle to the end, or the middle to the middle.

Additionally, the depth gradient may be formed as a constant slope from one side to the other, or may be formed as various types of straight lines or curves that include at least one rise and fall.

Continuing, Figure 2 is a diagram briefly illustrating an intaglio plate in which two lines are formed.

According to one embodiment of the present invention, the intaglio 10 for forming a multiple security element includes a plurality of pixels 110 to form a plurality of caustic lines 100. Here, for convenience of explanation, the description will be made with reference to the intaglio plate 10 on which two caustic lines 100 including a first caustic line 100a and a second caustic line 100b are formed.

The pixel 110 forming the first caustic line 100a includes a first recess 120a, and the pixel 110 forming the second caustic line 100b includes a second recess 120b.

The first recess 120a and the second recess 120b each have a depth gradient, and the depth gradients of the first recess 120a and the second recess 120b may be formed the same as each other, or may be formed differently. It can be.

At this time, the first recess 120a and the second recess 120b have different depths. By having different depths in this way, after the first recessed portion 120a and the second recessed portion 120b are filled with the same security ink composition, the printed security print produced has the first recessed portion 120a and the second recessed portion 120b due to the difference in ink amount due to the depth difference. The caustic line 100a and the second caustic line 100b display different colors or change colors in different ways.

Accordingly, there is an advantage in that security elements having different visual patterns can be formed even by applying and printing the same security ink composition on one intaglio 10.

At this time, in order to form different visual patterns by the first caustic line 100a and the second caustic line 100b, the depth of the first recess 120a forming the first caustic line 100a is 10 to 50㎛. Preferably, the depth of the second recess 120b forming the second caustic line 100b is formed deeper than the depth of the first recess 120a.

In addition, in order to be able to observe the visual effect of the security element and at the same time secure printability, it is preferable that the width of the drawing line 100 is at least 70㎛.

The first recess 120a is for forming the first caustic line 100a of low depth, and can be precisely engraved using a laser engraving method, and has a thickness of 10 to 50㎛ that can form a visually recognizable caustic line when printing. It is preferable to be formed as

The second concave portion 120b is used to form a high-depth second caustic line 100b, and in order to form a visual pattern that is clearly different from the first caustic line 100a, the first concave portion 120a and the second caustic line 100b It is preferable that the difference between the minimum depth value of the recess 120b and the depth of the first recess 120a is at least 50㎛ or more.

FIG. 3 is a schematic diagram of security prints 20 having different afterglow characteristics according to another embodiment of the present invention, and FIG. 4 shows ultraviolet ray irradiation of the security ink composition used in the security prints 20. This is a graph depicting the hourly emission intensity before and after.

Since the security print 20 according to this embodiment can be formed by printing using the intaglio 10 and the security ink composition according to an embodiment of the present invention, redundant description of the intaglio 10 will be omitted.

The security ink composition may include a blue phosphor, a green phosphor, and a red phosphor. By including the blue phosphor, green phosphor, and red phosphor in this way, the color of the afterglow that appears in the low-depth caustic line and the high-depth caustic line when irradiated with an ultraviolet light source and when the light source is removed is different, or is sequentially multiple. It can be changed, thereby improving the security of the security print 20.

At this time, the ultraviolet light source may be a UV-A light source or a UV-B light source having a wavelength range of 280 to 400 nm, and preferably a UV-A light source having a wavelength range of 315 to 400 nm may be used. You can.

Due to the depth gradient formed in the intaglio 10, the security print 20 has a gradient in which the first caustic line 100a and the second caustic line 100b of the security print 20 printed with the security ink composition become darker or darker, respectively. It has an effect.

These gradient effects can appear in brightness, saturation, or color, and can have a single gradient effect in which one caustic line gradually becomes darker or darker, or a multiple gradient effect in which a single caustic line gradually becomes darker and then darker, or gradually becomes lighter and then darker. You can have it.

Additionally, the first caustic line 100a and the second caustic line 100b may have the same pattern of gradient effects or may have different patterns of gradient effects.

A first line 100a printed with a security ink composition filled in the first recess 120a of the intaglio 10, and a security ink filled in the second recess 120b formed at a deeper depth than the first recess 120a. The second caustic lines 100b printed with the composition have different afterglow characteristics.

For this purpose, the depth of the first recess 120a forming the first caustic line 100a is preferably 10 to 50 μm, and the depth of the second recess 120b forming the second caustic line 100b is preferably 10 to 50 μm. It is preferable that it is formed deeper than the depth of the recessed portion 120a, and more preferably, the difference in the minimum depth value between the first recessed portion 120a and the second recessed portion 120b is preferably at least 50㎛.

This appears because the security ink composition is filled and printed on the intaglio plate 10 having recesses 120 with different depths, and the amount of the security ink composition contained in each printed caustic line 100 is different, and thus the same security Since different afterglow characteristics appear even when ink compositions are used, there is no need to use different security ink compositions to ensure different afterglow effects for each caustic line 100, thereby simplifying the printing process and providing security with just one printing. There is an advantage in ensuring enhanced security of the printed matter 20.

As a security ink composition for providing different afterglow effects due to differences in depth, a security ink composition containing a blue phosphor, a green phosphor, and a red phosphor may be used.

Blue phosphors (fluorescent substances) can be used in both organic and inorganic systems with a colorless or almost colorless appearance, and the phosphors used together have different emission wavelengths. In the case of organic dyes, dyes can also be used, and it is effective to have an invisible colorless or light color for the unique luminescent color. The blue phosphor may be, for example, an organic coumarin-based phosphor or an inorganic Sr(PO ₂ )Cl:Eu or ZnS:Ag phosphor, but is not limited thereto.

The amount of blue phosphor used is preferably 0.1 to 10% by weight based on the entire security ink composition. Specifically, in the case of an organic blue phosphor, it is more preferably used in an amount of 0.1 to 2% by weight, and in the case of an inorganic blue phosphor, it is preferably used in an amount of 1 to 10% by weight.

If the content of blue phosphor is insufficient, there may be a problem that the fluorescence effect emitted when irradiated with ultraviolet rays is reduced, and if it is excessive, there may be an excessive difference between the luminance of the phosphor and the afterglow luminance of the phosphor, making it difficult to recognize the afterglow. Therefore, it is preferable that it is included within the above-mentioned weight range.

Green phosphor (phosphor) and red phosphor (phosphor) are in the form of metal compounds or metal oxides. It is effective for the exterior color to be invisible, colorless or light in order to create a unique luminous color, and it is desirable for the afterglow to persist for several seconds or more in a dark place even after external stimuli are removed.

Green phosphors and red phosphors are used mixed with blue phosphors, and those that react to specific wavelengths can be used to show color changes depending on time or ultraviolet wavelength. For example, phosphors that respond to UV-A or UV-C types can be used.

Due to the physical characteristics of phosphors, larger particles have higher luminance (luminescence performance), but if the particles are large, the manufacturing suitability according to the particle size decreases in the manufacture of ink, and problems with printing suitability such as transferability of ink or wear of the printing plate may occur, so it is necessary to use appropriate particles. Selection of pigment size is important.

In addition, the afterglow effect at each depth varies greatly depending on the content of the phosphor contained in the ink, and if the content of the phosphor is excessive, there is a problem of poor printability. In order to ensure appropriate security, workability, and durability of printed materials, In the case of green phosphor, it is preferably used in an amount of 3 to 10% by weight, and in the case of a red phosphor, it is preferably used in an amount of 7 to 17% by weight.

ZnS:Cu phosphor and YAlO ₃ :Ce phosphor can be used as the green phosphor, and CaS:Eu,Tm phosphor can be used as the red phosphor, but are not limited thereto, in order to form different afterglow effects depending on the depth. It is preferable to use the phosphors listed in .

In particular, when ZnS:Cu phosphor is used as the green phosphor and CaS:Eu,Tm phosphor is used as the red phosphor, green color appears predominantly at the beginning of light source removal due to the green phosphor with high excitation efficiency, and then predominates after light source removal. As time passes, only red, which has excellent afterglow efficiency, remains, so the change in afterglow color from green to red can be observed more clearly.

In addition, when using a combination of the green phosphor and the red phosphor described above, the green phosphor and the red phosphor described above are excited by a laser diode light source of 400 to 465 nm, have a green color when irradiated with the light source, and have a green color when the light source is removed. It has the characteristic of changing from a green afterglow to a red afterglow, so additional verification of authenticity is possible using the above light source.

Meanwhile, as described above, the low-depth first caustic line 100a and the high-depth second caustic line 100b formed on the security print 20 of the present invention have different afterglow effects.

Specifically, while irradiating ultraviolet rays (before t ₀ ), both the first caustic line 100a and the second caustic line 100b are emitted by a blue phosphor and a green phosphor and appear blue. At this time, because the green phosphor also emits light, the blue color is not completely blue, but a slightly greenish blue color is observed.

Then, when the ultraviolet rays are removed (t ₀ ), the first caustic line 100a emits green and then goes out, and the second caustic line 100b emits green, yellow, and red in that order and then goes out.

This is an effect that appears because the depth of the first caustic line 100a and the second caustic line 100b are different while using the red phosphor and the green phosphor. Specifically, the red phosphor reacts to UV-C (100-280 ㎚) and has low excitation efficiency in UV-A light sources (315-400 ㎚) or UV-B light sources (280-315 ㎚), so UV When irradiated with -A or UV-B light source, red afterglow due to red phosphor does not appear at low depth, and afterglow due to red phosphor appears only at high depth.

In addition, since the green phosphor is a phosphor that reacts to UV-A or UV-B, the quenching pattern described above appears when irradiated with a UV-A or UV-B light source.

Therefore, due to the characteristics of this phosphor, the time-dependent extinction patterns according to the irradiation and removal of ultraviolet rays of the first caustic line 100a and the second caustic line 100b with different depths appear differently, thereby improving the security of the security document. You can do it.

Meanwhile, the composition of the security ink composition described above is a preferred example, and the present invention does not necessarily limit the use of a green phosphor and a red phosphor together as the phosphor included in the security ink composition, but uses only one type of phosphor. It also includes technologies that use two types of phosphors of different colors together or three or more types together.

For example, when one type of phosphor is used, a difference in luminous intensity occurs between low and high depths, making it possible to apply security elements according to depth.

Meanwhile, the authenticity of the above-mentioned security print 20 can be determined through the following method.

First, the color change of the security element shown on the security printed matter 20 is confirmed through the primary light source irradiation step in which the visible light source or UV-C light source is irradiated and then removed.

When irradiated with visible light or UV-C light source, both the low-depth first caustic line 100a and the high-depth second caustic line 100b show no color. In theory, a red afterglow appears, but the brightness of the light source is high, so no color is observed.

Then, when the light source is removed, a red afterglow appears in both the first caustic line 100a and the second caustic line 100b and then goes out.

Next, the color change of the security element shown on the security print 20 is confirmed through a secondary light source irradiation step in which UV-A or UV-B light source is irradiated and then removed.

When illuminated by a light source, both the first caustic line 100a and the second caustic line 100b have a slightly greenish blue color.

Then, when the light source is removed, the low-depth first caustic line 100a emits green color and then goes out, and the second caustic line 100a sequentially emits green, yellow, and red colors and then goes out.

Lastly, if the extinction pattern in the primary and secondary light source irradiation steps is as described above, the product can be judged as genuine.

The present invention is not limited to the specific embodiments and descriptions described above, and various modifications can be made by anyone skilled in the art without departing from the gist of the invention as claimed in the claims. and such modifications fall within the protection scope of the present invention.

10: intaglio 20: security printout
100: Caustic lines 110: Pixels
120: waist

Claims (12)

A plurality of caustics including first and second caustics using an intaglio and a security ink composition including a plurality of pixels and including a plurality of recesses to form a plurality of caustics including first and second caustics. In this printed security material:
The security ink composition includes 0.1 to 10 wt% of blue phosphor, 3 to 10 wt% of green phosphor, and 7 to 17 wt% of red phosphor,
The plurality of recesses included in the intaglio include first recesses of pixels forming a first caustic line and second recesses of pixels forming a second caustic line, each recess having a depth gradient,
The first concave part forming the first caustic line and the second concave part forming the second caustic line have different depths,
Due to the depth gradient, the first and second caustics on which the security ink composition is printed have a gradient effect of becoming darker or blurring, respectively,
The first caustic line printed with the security ink composition filled in the first recess and the second caustic line printed with the security ink composition filled in the second recess formed at a greater depth than the first recess have different afterglow characteristics, and the ultraviolet-ray- When irradiated with A or ultraviolet-B, the first and second caustics have a blue color. After the ultraviolet irradiation is stopped, the first caustic line emits green and then goes out, and the second caustic line emits green, yellow, and red in that order. A security imprint formed with multiple security elements, characterized in that they are extinguished. According to paragraph 1,
A security print formed with multiple security elements, characterized in that the depth gradient of the first recess and the second recess are different from or the same as each other. According to paragraph 1,
A security print formed with multiple security elements, characterized in that the depth of the first recess is 10 to 50㎛. According to paragraph 1,
The depth of the second recess is deeper than that of the first recess,
A security print formed with multiple security elements, characterized in that the difference between the lowest depth values of each of the first recess and the second recess is at least 50 μm. According to paragraph 1,
A security print formed with multiple security elements, characterized in that the multiple security elements are at least one of letters, numbers, pictures, patterns, and patterns. delete delete delete delete delete According to paragraph 1,
A security print formed with multiple security elements, characterized in that the green phosphor is a ZnS:Cu phosphor, a YAlO ₃ :Ce phosphor or a mixture thereof. According to paragraph 1,
A security imprint formed with multiple security elements, characterized in that the red phosphor is a CaS:Eu,Tm phosphor.

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