CN108538187B - Combined fluorescent pattern and application thereof - Google Patents

Combined fluorescent pattern and application thereof Download PDF

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Publication number
CN108538187B
CN108538187B CN201810338949.0A CN201810338949A CN108538187B CN 108538187 B CN108538187 B CN 108538187B CN 201810338949 A CN201810338949 A CN 201810338949A CN 108538187 B CN108538187 B CN 108538187B
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China
Prior art keywords
printing
pattern
fluorescent
combined
under
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CN201810338949.0A
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Chinese (zh)
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CN108538187A (en
Inventor
汪竹兵
励进
徐红梅
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China Banknote Printing And Minting Group Co ltd
SHANGHAI BANKNOTE PRINTING CO Ltd
Original Assignee
SHANGHAI BANKNOTE PRINTING CO Ltd
China Banknote Printing and Minting Corp
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Priority to CN201810338949.0A priority Critical patent/CN108538187B/en
Publication of CN108538187A publication Critical patent/CN108538187A/en
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09FDISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02Forms or constructions
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14Security printing
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09FDISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02Forms or constructions
    • G09F2003/0257Multilayer

Abstract

The invention discloses a combined fluorescent pattern and application thereof, wherein the combined fluorescent pattern is formed by combining different printing plate patterns and/or images formed in at least two printing layers, at least one printing layer is formed by printing colorless fluorescent ink, the other printing layers are formed by printing colored fluorescent ink, and at least two printing layers can generate different fluorescent colors under the same exciting light. The invention is applied to the anti-counterfeiting document, can display or not display a visual pattern under visible light, can display another visual pattern under an exciting light, and realizes pattern color and level change by means of relative change between different printing plate patterns of each printing layer, thereby being difficult to accurately restore the whole level change of the combined fluorescent pattern under the exciting light due to the additive color effect of light, causing great difficulty to copy and counterfeit, and realizing the set target of safety anti-counterfeiting.

Description

Combined fluorescent pattern and application thereof
Technical Field
The invention relates to the technical field of anti-counterfeiting, in particular to a combined fluorescent pattern and application thereof.
Background
The fluorescent ink is one of inks widely applied in modern anti-counterfeiting printing, and is suitable for packaging and printing of securities, certificates, high-grade cigarettes, wine, medicines, cosmetics and other commodities. Meanwhile, in the field of security printing, the fluorescence anti-counterfeiting technology is applied to banknotes of multiple countries such as RMB, USD and Euro in the world at present.
CN102241208A describes a colorless fluorescent anti-counterfeit method, which scans personalized signatures or images and texts into a computer, and performs over-line and frequency modulation processing on the images and texts of an original document, and performs color overprinting processing to obtain an anti-counterfeit label. The colorless fluorescent printing has hiding property and unknown property, and the obtained pictures and texts cannot be copied or scanned, so that the anti-counterfeiting performance of the pictures and texts is enhanced.
CN203733411U describes an anti-counterfeit offset printing product, which comprises a cardboard layer, an offset printing ink layer and an ultraviolet colorless fluorescent ink layer, wherein each layer is arranged from bottom to top in sequence, and the ultraviolet colorless fluorescent ink layer is an anti-counterfeit dot pattern. And generating an anti-counterfeiting dot pattern by a computer, setting a locus, manufacturing an offset printing PS plate by micro-printing, and printing the anti-counterfeiting dot pattern by adopting ultraviolet colorless fluorescent ink. When the pattern is observed under a common light source, the pattern is not displayed; the ultraviolet fluorescent light source is used for observing and displaying the purple pattern by using the magnifier, the pattern has uniqueness, and the size, distance and distribution difference of the mesh points of the real and false patterns can be clear at a glance according to the positioning marks and cannot be copied and counterfeited.
In CN103223795A, an additive printing imaging method is described, which uses ultraviolet excited red, green and blue fluorescent inkjet inks, and uses the additive principle to image during printing process to obtain a color fluorescent image. The three ultraviolet absorption fluorescent anti-counterfeiting inks are invisible inks, and can show various colored effects under the irradiation of a specific ultraviolet lamp through the matching of red, green and blue inks in different proportions and the superposition of emission wavelengths in different ranges.
In US2013128319 a security document overprinted with neon fluorescent inks for checks, drafts, prescriptions, grades etc. is described, by using a plurality of neon fluorescent inks printed onto paper in a predetermined pattern and density, whereby the design is sharply transformed under uv excitation and electronically scanned in order to increase the security of the document against forgery, copying, tampering and washing.
In US2003107639 a thermal transfer printing process is described for licenses, bank cards, certificates and the like having fluorescent security features, which involves printing indicia onto one dye receptive surface of a card substrate, the indicia being printed in a processed color produced from a combination of yellow, magenta and cyan dyes, the overlapable layer precisely locating and selectively printing the indicia, forming the printed indicia with fluorescence under normal visible light.
At present, the application of the fluorescent anti-counterfeiting technology is mostly the use of a single fluorescent material or the simple superposition of multicolor fluorescent materials, and the visual effect and the anti-counterfeiting performance have certain limitations.
Disclosure of Invention
In view of the above, the main object of the present invention is to provide a combined fluorescent pattern and its application, which is intended to at least partially solve at least one of the above mentioned technical problems.
In order to achieve the purpose, the technical scheme of the invention is as follows:
as one aspect of the present invention, there is provided a combined fluorescent pattern, which is formed by combining different printing patterns and/or images formed in at least two printing layers, at least one of the printing layers is printed by colorless fluorescent ink, and the remaining printing layers are printed by colored fluorescent ink, wherein at least two printing layers can generate different fluorescent colors under the same excitation light.
Preferably, the at least two printed layers are capable of producing different fluorescent colors under different excitation lights.
Preferably, the excitation light is ultraviolet light with a wavelength range of 315-380nm or ultraviolet light with a wavelength range of 235-315 nm.
Preferably, the printing plate patterns and/or images between the printing layers are adjacent, nested or partially overlapped.
Preferably, the printing plate lines and/or images are formed using a line or grid pattern to reduce the overlap area of the printing plate lines and/or images between the printing layers.
Preferably, the design of the different printing formes and/or images is carried out by adjusting the line type, line width, line spacing, line density or line angle.
Preferably, the combined fluorescent pattern is printed by multilayer overprinting.
Preferably, the overprint printing has a plate making resolution of 5080-10160 dpi; the printing overprinting precision error is not more than 0.01 mm.
Preferably, the overprint printing is selected from offset printing, letterpress printing, intaglio printing, screen printing or digital printing.
Preferably, the combined fluorescent pattern is formed on the same side of a substrate; or
The combined fluorescent pattern is formed on two sides of a base material, and the base material is made of transparent or semitransparent materials.
As another aspect of the present invention, there is provided a use of the combined fluorescent pattern as described above in security documents including banknotes, passports, identification cards, money orders, tax banderoles, securities, certificates, invoices, receipts, trademarks, contracts and commercial certificates.
Based on the technical scheme, the invention has the beneficial effects that:
(1) the multilayer printing layers are formed by printing colorless fluorescent ink or a combination of the colorless fluorescent ink and colored fluorescent ink, each printing layer comprises different printing plate lines and/or images, one visual pattern can be displayed or not displayed under visible light, the other visual pattern can be displayed under one exciting light, at least two printing layers can generate different fluorescent colors under the same exciting light, and the pattern colors and the gradation changes are realized by means of the relative change between the different printing plate lines of each printing layer due to the additive effect of light. Due to the composite effect of multilayer printing and the diffraction superposition effect of light, the colorless fluorescent material is subjected to certain visual deviation in photographing, scanning and detection under ultraviolet radiation, the detailed characteristics of the lines of the patterns of each printing layer are difficult to accurately copy, the integral hierarchical change of the combined fluorescent pattern under the excitation light is difficult to accurately restore, the copying and counterfeiting are greatly difficult, and the set target of safety and anti-counterfeiting is realized.
(2) Further, at least two printing layers can generate the same or different fluorescent colors under different excitation lights, at the moment, at least three observation conditions exist and present different visual patterns which are mutually different, the set pattern effect or all information cannot be completely read under the single observation condition, and therefore the patterns are difficult to further and completely copy, and therefore the comprehensive safety anti-counterfeiting characteristic is effectively improved.
Drawings
FIG. 1 is a schematic diagram of the principles of the present invention;
FIG. 2 is an exploded view of a fluorescent four-color composite pattern of the present invention for each printed layer;
FIG. 3 is an effect diagram of embodiment 1 of the present invention;
FIG. 4 is an effect diagram of embodiment 2 of the present invention;
fig. 5 is an effect diagram of embodiment 3 of the present invention.
Detailed Description
According to the invention, through the screening of the fluorescent ink and the combined configuration of the printing plate pattern design, a new combined fluorescent security pattern can be realized, the difficulty of copying and counterfeiting is increased, the visual effect level is enriched, and meanwhile, the comprehensive security anti-counterfeiting characteristic is effectively improved.
As shown in fig. 1, when a multicolor fluorescent ink is used for printing, a new color is generated under the superposition of a plurality of different fluorescent colors due to the additive color effect of light, and the new color is applied to a combined fluorescent pattern formed by combining different printing plate patterns and/or images formed in at least two printing layers, wherein at least one printing layer is printed by colorless fluorescent ink, the rest printing layers are printed by colored fluorescent ink, and at least two printing layers can generate different fluorescent colors under the same excitation light. This results in the combined fluorescent pattern displaying or not displaying a visual pattern under the first viewing conditions (e.g., visible light) and another visual pattern under the second viewing conditions (e.g., excited light), which achieves a change in the color and gradation of the pattern due to additive color mixing effects.
Further, if at least two printed layers can generate the same or different fluorescent colors under different excitation lights, more level changes of the pattern are realized under at least three observation conditions (visible light, first excitation light, second excitation light), and different information can be hidden through a plurality of levels.
As shown in FIG. 2, the concept of the present invention is explained in detail by taking a fluorescent four-color combined pattern as an example, the fluorescent combined pattern includes four printing layers, each printing layer forms different printing plate patterns and/or images, and the first printing layer and the second printing layer are printed by colored fluorescent, the third printing layer and the fourth printing layer are printed by colorless fluorescent, the first printing layer and the third printing layer display fluorescent light under long-wave excitation light, the second printing layer and the fourth printing layer display fluorescent light under short-wave excitation light, at this time, under a first observation condition (normal light/visible light), the combined pattern of the first pattern and the second pattern is displayed, under a second observation condition (wavelength 315 and excitation light 380 nm), the combined pattern of the first pattern and the third pattern is displayed, and due to the additive effect of light, the combined pattern of the first pattern and the third pattern presents natural transition of color, under a third observation condition (wavelength 235 and excitation light 315 nm), the combined pattern of patterns two and four is displayed and, due to the additive effect of light, the combined pattern of patterns one and three presents a natural transition in color.
The composite effect of multilayer printing and the diffraction superposition effect of light have certain visual deviation in photographing, scanning and detecting of the combined pattern under ultraviolet radiation, so that the detailed characteristics of the lines of the patterns of each printing layer are difficult to accurately copy, and the visual effect of the combined pattern can be changed due to tiny line change, so that the difficulty in copying and counterfeiting is increased.
Further, the printing plate patterns or images of the printed layers of the combined fluorescent pattern may be adjacent, nested, or partially overlapping. However, due to the superposition of the multi-color fluorescent materials, the luminous effect is continuously attenuated, and due to the additive color effect, the superposition of the red, green and blue lights is white light, and the observation effect under ultraviolet radiation can also be influenced, so that lines or grid patterns are adopted in the printing plate patterns in practical application, and the area of the ink overlapping area of each printing layer is reduced or approaches to zero as far as possible.
Furthermore, different printing plate patterns and/or images can be designed by adjusting the elements such as line types, line widths, line intervals, line densities or line angles, and the like, and complex and multiple changes on a composite hidden pattern or a detail level are presented under excitation light by utilizing the matching of the relative change of the elements in the plate pattern design and the fluorescence color, so that certain difficulty is increased for trying to copy and restore counterfeiting.
Furthermore, the combined fluorescent pattern is formed by multilayer overprinting, the plate-making resolution of the overprinting is 5080-10160 dpi, the printing overprinting precision error is not more than 0.01mm, the thickness of a completely reduced line can be as low as 0.02mm, and the ideal effect of the combined fluorescent can be completely realized; the overprint printing is selected from offset printing, letterpress printing, gravure printing, screen printing, digital printing, or the like.
Further, the printed substrate combined with the fluorescent pattern can be selected from paper, plastic and their composites, and can be applied to bank notes, passports, identity cards, money orders, tax banderoles, securities, certificates, invoices, receipts, trademarks, contracts or commercial certificates; and may be printed with a print pattern on the same side and the area viewed reflectively. If an observer places a UV source in front of and behind the substrate, the area can be viewed reflectively and transmissively, respectively, to inspect the features. It is further achieved that said features of the combined fluorescent pattern can also be achieved if the substrate is transparent or translucent, said multilayer embossing being printed on both sides of the substrate, respectively.
The technical solution of the present invention is further explained by the following specific examples:
example 1
FIG. 3 shows one embodiment of a combined fluorescent pattern of the present invention printed with a three-color fluorescent ink.
The first color is printed by colored fluorescent ink (normal color: orange, fluorescent color: blue), the long-wave fluorescence is carried out, and the angle of a parallel line is 120 degrees; the second color is printed by colorless fluorescent ink (fluorescent color: green), and the second color is fluorescent with long wave and parallel line angle of 0 degree; the third color was printed with colorless fluorescent ink (fluorescent color: red), short wavelength fluorescent, parallel line angle 60 °. Through professional graphic and text making software (such as Fortuna, Jura and the like), detail processing and parameter setting are carried out on each layer of graphic lines according to the gray level change of a design drawing, so that the natural and rich detail transition is ensured, and digital information is respectively hidden.
Under a first observation condition, namely normal light, the printed matter presents an orange pattern printed by the colored fluorescent ink; under the second observation condition, namely under the ultraviolet excitation light with the wavelength of 315-380nm, the printed matter presents a combined pattern printed by the long-wave fluorescent ink; under the third observation condition, namely under the ultraviolet excitation light with the wavelength of 235-315nm, the printed matter presents a pattern printed by the short-wave fluorescent ink. Under the three observation conditions, the presented patterns are different, and meanwhile, the set pattern color and level change is realized by means of the relative changes of patterns, line types, line widths, intervals, densities and angles among the printing plate patterns of different printing layers, and due to the additive color effect of light, and different hidden information is presented.
On one hand, due to the composite effect of multilayer printing and the diffraction superposition effect of light, the combined pattern has certain visual deviation in photographing, scanning and detection under ultraviolet radiation, the detailed characteristics of the lines of the patterns of each printing layer are difficult to accurately copy, and the extremely tiny line change can change the visual effect of the combined pattern, so that the difficulty in copying and counterfeiting is increased; on the other hand, the patterns under different observation conditions are different, and the set pattern effect or all information cannot be completely read under a single observation condition, so that the patterns are difficult to further and completely copy, and the aim of safety and anti-counterfeiting is effectively fulfilled.
Example 2
FIG. 4 shows another embodiment of a combined fluorescent pattern of the present invention. Printing with two-color colorless fluorescent ink. The first color adopts colorless fluorescent ink (fluorescent red), average lines are printed, the line width of the middle area of the Chinese knot pattern is uniformly changed from right to left from thin to thick, the intervals are uniform, and the line angle is 135 degrees. The second color adopts colorless fluorescent ink (fluorescent green), the average lines are printed, the line width of the middle area of the Chinese knot pattern is uniformly changed from thick to thin from left to right, the intervals are uniform, and the line angle is 45 degrees.
Under the ultraviolet excitation light with the wavelength of 315-380nm, due to the additive color mixing effect, the mixed region of the red fluorescence and the green fluorescence forms a yellow visual effect due to the variation of the line thickness and the density, and the transition is natural and soft. The Chinese knot pattern has a dynamic visual effect of interpenetration of lines, effectively improves the hierarchical space and artistic expressive force of the fluorescent pattern, and increases the difficulty of copying and counterfeiting.
Example 3
FIG. 5 shows another embodiment of a combined fluorescent pattern of the present invention. And (4) printing by using three-color colorless fluorescent ink. The first color adopts colorless fluorescent ink (fluorescent red), and average lines are printed; the line width is changed from thin to thick uniformly, the interval is uniform, and the line angle is 135 degrees. The second color is printed by colorless fluorescent ink (fluorescent green) and average lines; the line width is changed from thin to thick uniformly, the intervals are uniform, and the line angle is 45 degrees. The third color is printed by colorless fluorescent ink (fluorescent blue) and average lines; the line width is changed from thin to thick uniformly, the interval is uniform, and the line angle is 135 degrees.
Under the ultraviolet excitation light with the wavelength of 315-380nm, due to the additive color mixing effect, the density and the thickness of lines are used for realizing the concentration change of color light, and the three fluorescent inks of fluorescent red, fluorescent green and fluorescent blue are mixed in pairs to form a constantly changing visual effect, and the transition is natural and soft. The visual effect of the whole pattern is rich in variation, the color space and the layering sense of the fluorescent pattern are greatly enhanced, the visual effect and the expressive force of a printed product are improved, the counterfeiting difficulty of a counterfeiter is also improved, and the comprehensive anti-counterfeiting function of the fluorescent material is further perfected.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A combined fluorescent pattern is characterized by being formed by combining different printing plate patterns and/or images in at least two printing layers formed on a substrate, wherein at least one printing layer is formed by printing colorless fluorescent ink, the rest printing layers are formed by printing colored fluorescent ink, at least two printing layers can generate different fluorescent colors under the same first excitation light, at least two printing layers can generate different fluorescent colors under different first excitation light and second excitation light respectively, and the printing plate patterns and/or images between the printing layers are adjacent, mutually nested or partially overlapped;
wherein, under visible light, the combined fluorescent pattern presents a combination of visual patterns; under the first exciting light, the combined fluorescent pattern presents a visual pattern combination II which is different from the visual pattern combination I, and under the additive color effect of different fluorescent colors, the visual pattern combination II has pattern colors and gradation change; under the second exciting light, the combined fluorescent pattern presents a visual pattern combination III which is distinguished from the visual pattern combination I and the visual pattern combination II.
2. The assembled fluorescent pattern of claim 1, wherein the first excitation light is ultraviolet light in the wavelength range of 315-380nm, and the second excitation light is ultraviolet light in the wavelength range of 235-315 nm;
or the first exciting light is ultraviolet light with the wavelength range of 235-315nm, and the second exciting light is ultraviolet light with the wavelength range of 315-380 nm.
3. The assembled fluorescent pattern of claim 1, wherein the printing plate lines and/or images are formed using a line or rasterized pattern to reduce the overlap area of the printing plate lines and/or images between the printing layers.
4. The composite fluorescent pattern of claim 3, wherein the design of different printing patterns and/or images is performed by adjusting line types, line widths, line pitches, line densities, or line angles.
5. The composite fluorescent pattern of claim 1, wherein the composite fluorescent pattern is printed using multi-layer overprinting.
6. The combined fluorescent pattern of claim 5, wherein:
the plate making resolution of the overprinting is 5080-10160 dpi; the overprint precision error is not more than 0.01mm, and the overprint printing mode is selected from offset printing, letterpress printing, intaglio printing, silk screen printing or digital printing.
7. The combined fluorescent pattern of claim 1, wherein:
the combined fluorescent pattern is formed on the same side of a substrate; or
The combined fluorescent pattern is formed on two sides of a base material, and the base material is made of transparent or semitransparent materials.
8. Use of the combination fluorescent pattern of any one of claims 1 to 7 in security documents including banknotes, passports, identity cards, money orders, tax banderoles, securities, certificates, invoices, receipts, trademarks, contracts and commercial certificates.
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Address after: 200063 158 Cao Yang Road, Shanghai, Putuo District

Patentee after: SHANGHAI BANKNOTE PRINTING Co.,Ltd.

Patentee after: China Banknote Printing and Minting Group Co.,Ltd.

Address before: 200063 158 Cao Yang Road, Shanghai, Putuo District

Patentee before: SHANGHAI BANKNOTE PRINTING Co.,Ltd.

Patentee before: CHINA BANKNOTE PRINTING AND MINTING Corp.