KR20230076648A - Intaglio for security elements and security printed matter printed using the same - Google Patents

Abstract

The present invention relates to, in an intaglio plate including a plurality of pixels and forming a plurality of caustic lines, an intaglio plate forming multiple security elements wherein a first recess of the pixel forming the first caustic line and a second recess of the pixel forming the second caustic line each have a depth gradient, wherein a first concave portion forming the first caustic line and a second concave portion forming the second caustic line have different depths, and security prints printed using the above intaglio and security ink compositions. Security prints 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 prints.

Description

An intaglio for forming multiple security elements and a security printed matter printed using the same {Intaglio for security elements and security printed matter printed using the same}

The present invention relates to intaglios for forming multiple security elements and security prints printed using the same, and more particularly, a depth gradient is formed in pixels to have a gradation effect, and the depths of each caustic line are formed asymmetrically to each other. It relates to intaglios capable of forming security elements having different colors and durations of light emission, and security prints printed using the same.

[Assignment identification number] KOM2021_07

[Name of Department] Ministry of Strategy and Finance

[Research management institution] Korea Minting and Security Management Corporation

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

[Research Project Name] Creation of security ink for printing public security products and application solution IP

[Organizer] Korea Minting and Security Management Corporation

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

Intaglio printing is a printing method in which a concave stroke line is made on a metal plate surface, ink is cast on the plate surface, ink is filled into the stroke concave portion, excess ink on the intaglio plate surface is wiped off, and the ink is transferred to the paper with strong pressure. In general, ink is filled in the concave portion of a printing plate preheated to 80 degrees Celsius or more, and the ink is transferred to paper by a difference in high pressure and surface energy to form a printed line (drawing line).

When intaglio printing, grooves are made on a thick metal plate material, so the thickness of the ink can be thick. It has advantages that cannot be imitated by the method, so it is widely used for producing precision printing and anti-counterfeiting printed materials, and it is possible to print more than 6,000 sheets per hour at high speed, so the productivity is very excellent.

In general, forgery prevention methods that exhibit anti-copying effects by using special ink, such as forming a different printing pattern during intaglio printing, adding metal powder to printing ink, or using fluorescent ink, are being implemented. It damages the dignity of securities or important documents and has insufficient anti-counterfeiting effect.

In addition, since there is a possibility of producing a counterfeit security product by printing a security element by purchasing a commercially available special ink and using it instead of the special ink used for the security element, the effectiveness may be small.

Accordingly, there is a need for an intaglio printing method capable of securing more improved security.

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

An object of the present invention is to provide an intaglio for forming multiple security elements capable of forming a latent image and forming security elements having different colors and durations for each caustic line and a security print printed using the intaglio.

One embodiment of the present invention for achieving the above object is to form a first causal line in an intaglio plate capable of forming a plurality of caustic lines including a plurality of pixels and including first and second caustic lines. The first concave portion of the pixel and the second convex portion of the pixel forming the second causal line each have a depth gradient, and the first concave portion forming the causal line and the second concave portion forming the second causal line have different depths, It relates to intaglios for forming multiple security elements.

Depth gradients of the first concave portion and the second concave portion may be different from or identical to each other.

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

The depth of the second concave portion may be greater than that of the first concave portion, and a difference between minimum depth values between the first concave portion and the second concave portion may be at least 50 μm.

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 drawing lines including first and second drawing lines are printed using the intaglio and the security ink composition according to one 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 on the intaglio, the first drawing line and the second drawing line of the security printed matter printed with the security ink composition may each have a gradation effect of thickening or blurring.

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

When irradiated with ultraviolet rays, the first caustic line and the second caustic line have a blue color, and after the UV irradiation is stopped, the first caustic line emits green light and then extinguishes, and the second caustic line emits green, yellow, and red colors in the order and then extinguishes. there is.

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

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

A difference between the lowest depth values of the first concave portion and the second concave portion may be at least 50 μm.

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

The red phosphor may be a SrS:Eu phosphor.

The intaglio for forming the multiple security elements of the present invention and the security printed matter printed using the intaglio have a gradation effect by forming a depth gradient in the pixels of the intaglio, and the depth of each caustic line is formed asymmetrically so that different colors and light are emitted. It is possible to form a security element having a duration.

1 is a diagram schematically illustrating an intaglio for forming multiple security elements according to an embodiment of the present invention.
2 is a diagram schematically illustrating an intaglio in which two caustic lines are formed.
3 is a view briefly showing a security printed matter according to another embodiment of the present invention.
all.
Figure 4 is a graph schematically illustrating the emission intensity per hour before and after ultraviolet irradiation of the security ink composition.

Prior to a detailed description of the preferred embodiments of the present invention below, the terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, and meanings consistent with the technical spirit of the present invention. and should be interpreted as a concept.

Throughout this specification, when a certain component is said to "include", it means that it may further include other components without excluding other components unless otherwise stated.

Throughout this specification, the meaning of "plurality" means at least two or more numbers, not singular, and the prefixes "first" and "second" are intended to refer to specific two components in a plurality of groups, and the two It does not mean that only one element exists, but means that two or more elements exist in total, including two specific elements.

Hereinafter, look at an embodiment of the present invention. However, the scope of the present invention is not limited to the following preferred embodiments, and those skilled in the art can implement various modified forms of the contents described herein within the scope of the present invention.

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

More specifically, an intaglio plate capable of forming a security element having a gradation effect by forming a depth gradient in pixels and having asymmetric depth of each caustic line having different colors and emission durations, and a printed product using the same It's about security prints.

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

An intaglio 10 for forming multiple security elements according to an embodiment of the present invention includes a plurality of pixels 110 to form a plurality of caustic lines 100 .

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

The causation line 100 may be formed by one pixel 110, and two or more pixels 110 may be aggregated to form one causation 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 drawing line 100 and may mean an intaglio piece, and the drawing line 100 may mean a concave portion of the intaglio 10 filled with ink.

In general, "drawing line" refers to a point, line, or surface printed after ink is filled in the concave portion 120, which is a concave part of the intaglio 10, but in the present invention, the intaglio 10 for forming a drawing line The concave part of is also defined as "causation".

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

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

The pixel 110 capable of forming one caustic line 100 includes a concave portion 120 concavely formed at a predetermined depth from the upper surface of the intaglio 10, and the concave portion 120 is filled with ink to form a security element. can be printed The concave portion 120 may be formed by cutting at least a portion of the pixels 110 by laser engraving.

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

The concave portion 120 is formed to have a depth gradient, and can provide a gradation effect in which colors gradually become darker or blurred during printing, and the brightness, saturation, or color gradually darkens or fades due to the gradation effect. It is possible to verify the authenticity of security prints according to the color gradient aspect of

In FIG. 1 , the depth gradient is illustratively shown in a form inclined from one end toward the other end, but the aspect of the depth gradient is not limited thereto.

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

Also, the shape of the depth gradient may be formed in the form of a constant slope from one side to the other, or may be formed in various forms of straight lines or curves including at least one rise and fall.

Subsequently, FIG. 2 is a diagram schematically illustrating an intaglio on which two caustic lines are formed.

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

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

The first concave portion 120a and the second concave portion 120b each have a depth gradient, and the depth gradients of the first concave portion 120a and the second concave portion 120b may be formed identically or differently. It can be.

At this time, the first concave portion 120a and the second concave portion 120b have different depths. By having different depths in this way, after the same security ink composition is filled in the first recessed portion 120a and the second recessed portion 120b, the manufactured security print is printed due to the difference in ink amount due to the depth difference. Different colors are displayed in the caustics 100a and the second caustics 100b, or color changes appear in different aspects.

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

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

In addition, in order to observe the visual effect of the security element and at the same time to secure printability, the width of the drawing line 100 is preferably at least 70 μm or more.

The first concave portion 120a is for forming a low-depth first caustic line 100a, which can be precisely engraved by a laser engraving method and has a thickness of 10 to 50 μm that can form visually recognized caustics during printing. It is preferable to form.

The second concave portion 120b is for forming a deep second caustic line 100b, and in order to form a visual pattern clearly different from the first causal line 100a, the first concave portion 120a and the second concave portion 120a It is preferable that the difference between the lowest depth value of the concave portion 120b and the depth of the first concave portion 120a is at least 50 μm or more.

3 is a view briefly showing security prints 20 characterized in that they have different afterglow characteristics according to another embodiment of the present invention, and FIG. 4 shows ultraviolet irradiation of a security ink composition used in the security prints 20 It is a graph of the luminous intensity per hour before and after.

Since the security print 20 according to the present embodiment may be printed and formed using the intaglio 10 and the security ink composition according to an embodiment of the present invention, a duplicate description of the intaglio 10 will be omitted.

The security ink composition may include a blue phosphor, a green phosphor and a red phosphor. As such, by including the blue phosphor, the green phosphor, and the red phosphor, the colors of the afterglow appearing in the caustics of low depth and the caustics of high depth when the ultraviolet light source is irradiated and emitted and when the light source is removed are different from each other, or are sequentially multiplied. It can be changed, through which the security of the security print 20 can be improved.

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. can

In the security print 20, due to the depth gradient formed on the intaglio 10, the first drawing line 100a and the second drawing line 100b of the security print 20 on which the security ink composition is printed have a gradation of darkening or blurring, respectively. have an effect

These gradient effects can appear in brightness, saturation, or color, and can have a single gradient effect in which one caustic fades in or out, or multiple gradients in which one caustic fades in and fades out or fades in to a darker color. can have

In addition, the first caustics 100a and the second caustics 100b may have the same pattern of gradation effects or different patterns of gradation effects.

The first drawing lines 100a printed with the security ink composition filled in the first concave portion 120a of the intaglio 10 and the security ink filled in the second concave portion 120b formed with a deeper depth than the first concave portion 120a. The second caustic lines 100b printed with the composition have different afterglow characteristics.

To this end, the depth of the first concave portion 120a forming the first caustic line 100a is preferably 10 to 50 μm, and the depth of the second concave portion 120b forming the second caustic line 100b is the first It is preferably formed deeper than the depth of the concave portion 120a, and more preferably, the difference between the lowest depth values of the first concave portion 120a and the second concave portion 120b is at least 50 μm or more.

This occurs because the intaglio 10 having recessed portions 120 having different depths is filled with and printed with the security ink composition, and the amount of the security ink composition included in each printed line 100 is different, and thus the same security Even if the ink composition is used, since different afterglow characteristics appear, since it is not necessary to use different security ink compositions to secure different afterglow effects for each line 100, the printing process can be simplified, and security can be printed only once. There is an advantage in securing enhanced security of the printed matter 20 .

As such, a security ink composition including a blue phosphor, a green phosphor, and a red phosphor may be used as a security ink composition for giving different afterglow effects due to a depth difference.

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

The amount of blue phosphor used is preferably 0.1 to 10% by weight based on the total 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 the blue phosphor is insufficient, there may be a problem in that the fluorescence effect of emitting light when irradiated with ultraviolet rays is degraded. Therefore, it is preferable to be included within the aforementioned weight range.

The green phosphor (phosphor material) and the red phosphor (phosphor material) have a form of metal compound or metal oxide. It is effective to have an invisible colorless or light color for a unique light emission color, and it is preferable that afterglow can last for several seconds or more in a dark place even after an external stimulus is removed.

A green phosphor and a red phosphor are used in combination with a blue phosphor, and one that reacts to a specific wavelength may be used to show a color change according to time or ultraviolet wavelength. For example, phosphors that react to UV-A or UV-C types can be used.

Due to the physical characteristics of phosphor, larger particles have higher luminance, but if the particles are large, the manufacturing aptitude according to the particle size decreases in the manufacture of ink and problems may occur in printability such as ink transferability or abrasion of the printing plate. The choice of size pigment is important.

In addition, the afterglow effect for 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. To secure appropriate security, workability, and durability of printed materials, In the case of the green phosphor, it is preferably used at 3 to 10% by weight, and in the case of the red phosphor, it is used at 7 to 17% by weight.

As the green phosphor, ZnS:Cu phosphor and YAlO ₃ :Ce phosphor may be used, and as the red phosphor, CaS:Eu,Tm phosphor may be used, but is not limited thereto. It is preferred 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 appears predominantly at the beginning of light source removal due to the green phosphor with good excitation efficiency, and after the light source is removed, a certain As time elapses, only red, which has excellent afterglow efficiency, remains, so that the pattern of changing the afterglow color from green to red is more clearly observed.

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

Meanwhile, as described above, the first causation line 100a of low depth and the second causation line 100b of high depth 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 caustics 100a and the second caustics 100b are emitted by the blue phosphor and the green phosphor to show blue. At this time, since the green phosphor also emits light, blue is not completely blue, but slightly greenish blue is observed.

Subsequently, when the ultraviolet rays are removed (t ₀ ), the first caustics 100a emits green light and is quenched, and the second caustics 100b emits green, yellow, and red sequentially and then extinguishes.

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

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

Therefore, due to the characteristics of the phosphor, the extinguishing pattern by time according to the ultraviolet irradiation and removal of the first caustic line 100a and the second caustic 100b having different depths is different from each other, thereby improving the security of the security document. can make it

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

Exemplarily, when one type of phosphor is used, since a difference in luminous intensity occurs between a low depth and a high depth, it is possible to apply a security element according to the depth through this.

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

First, through a first light source irradiation step in which a visible light source or a UV-C light source is irradiated and then removed, the color change of the security element appearing on the security print 20 is confirmed.

When a visible light or UV-C light source is irradiated, both the first caustics 100a of low depth and the second caustics 100b of high depth do not show color. Theoretically, a red afterglow appears, but the color is not observed because the luminance of the light source is high.

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

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

When irradiated with a light source, both the first caustics 100a and the second caustics 100b have a blue color with a slight greenish tinge.

Then, when the light source is removed, the first caustic line 100a of low depth emits green light and then extinguishes, and the second caustic line 100a emits green, yellow, and red sequentially and then extinguishes.

Finally, when the extinction patterns in the primary light source irradiation step and the secondary light source irradiation step are as described above, it can be determined 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 present invention claimed in the claims. and such modifications are within the protection scope of the present invention.

10: intaglio 20: security printout
100: caustics 110: pixels
120: lower back

Claims (12)

In an intaglio plate that includes a plurality of pixels and is capable of forming a plurality of caustics including first and second caustics,
A first concave portion of a pixel forming a first causal line and a second concave portion of a pixel forming a second causal line each have a depth gradient.
An intaglio for forming multiple security elements, wherein a first recessed portion forming a first drawing line and a second recessed portion forming a second drawing line have different depths. According to claim 1,
An intaglio for forming multiple security elements, characterized in that the depth gradient of the first concave portion and the second concave portion are different from or identical to each other. According to claim 1,
An intaglio for forming multiple security elements, characterized in that the depth of the first concave portion is 10 to 50 μm. According to claim 1,
The depth of the second recess is deeper than the depth of the first recess,
An intaglio for forming multiple security elements, characterized in that a difference between the lowest depth value of each of the first concave portion and the second concave portion is at least 50 μm. According to claim 1,
The intaglio for forming multiple security elements, characterized in that the multiple security elements are at least one of letters, numbers, pictures, patterns and patterns. In the security printed matter in which a plurality of drawing lines including first and second drawing lines are printed using the intaglio and the security ink composition according to any one of claims 1 to 5,
The security ink composition includes a blue phosphor, a green phosphor and a red phosphor,
Due to the depth gradient formed on the intaglio, the first drawing line and the second drawing line of the security printed matter on which the security ink composition is printed have a gradation effect of thickening or blurring, respectively,
The first false line printed with the security ink composition filled in the first concave portion and the second false line printed with the security ink composition filled in the second concave portion formed at a depth greater than that of the first concave portion have afterglow characteristics different from each other. . According to claim 6,
When irradiated with ultraviolet rays, the first and second caustics have a blue color,
Characterized in that, after the ultraviolet irradiation is stopped, the first caustic line emits green light and then extinguishes, and the second caustic line emits green, yellow, and red sequentially and then extinguishes. According to claim 7,
The ultraviolet light is characterized in that it has a wavelength range of 280 ~ 400㎚, security print. According to claim 6,
An intaglio for forming multiple security elements, characterized in that the depth of the first concave portion is 10 to 50 μm. According to claim 6,
An intaglio for forming multiple security elements, characterized in that a difference between the lowest depth value of each of the first concave portion and the second concave portion is at least 50 μm. According to claim 6,
Characterized in that the green phosphor is a ZnS:Cu phosphor, a YAlO ₃ :Ce phosphor or a mixture thereof. According to claim 6,
Characterized in that the red phosphor is a CaS:Eu,Tm phosphor.

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