CN105131718B - A kind of false proof metameric ink and preparation method thereof and printing process - Google Patents
A kind of false proof metameric ink and preparation method thereof and printing process Download PDFInfo
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- CN105131718B CN105131718B CN201510589182.5A CN201510589182A CN105131718B CN 105131718 B CN105131718 B CN 105131718B CN 201510589182 A CN201510589182 A CN 201510589182A CN 105131718 B CN105131718 B CN 105131718B
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Abstract
The invention discloses a kind of false proof metameric ink, by the metamerism pigment that mass percent is 50% 60%, the fluorine-silicon modified acrylic resin of 14% 20%, the butyl acrylate of 6% 9%, the epoxy resin of 4% 8%, the near infrared absorbent of 2% 3%, the isopropanol of 3% 5%, the dehydrated alcohol of 3% 5%, the deionized water of 4% 8%, the sec-butylamine of 0.5% 1.5%, the terpineol of 0.5% 1%, the defoamer of 0.2% 0.5%, 0.1% 0.3% levelling agent formulated.The invention also discloses the preparation method of a kind of false proof metameric ink and a kind of printing process using false proof metameric ink, it achieves the fusion in same false proof district of the multiple anti-counterfeiting technology, false proof district presents different colors under different light sources irradiate, identify easily, people's degree of recognition to product can be improved, making product have multiple anti-fake, false proof intensity is high.
Description
Technical field:
The present invention relates to technical field of packaging and printing, a kind of for false proof metameric ink and this with
The preparation method of color different spectrum ink and the printing process of this metameric ink of use.
Background technology:
Anti-forgery ink has very important position in society security fields, has been obtained in various fields
Use widely.Anti-forgery ink refers to possess an anti-fraud functional class ink, and the material will with anti-counterfeiting performance adds oil to
In ink link stuff, the ink that the class made through certain processing technique is special.Metameric ink, under natural light irradiation
Essentially identical with common ink color, but use specific apparatus (such as infrared scanner or filter plate etc.) to observe, will find
Two kinds of ink have a very large change in form and aspect and contrast, and aberration highlights.Metameric ink is in human eye height sensitizing range
(400-700nm) presenting the essentially identical curve of spectrum in, in low sensitizing range (invisible area), the curve of spectrum has the biggest
Difference.
Along with the most progressive of anti-counterfeiting technology and development, market will more for the demand of metamerism anti-counterfeiting technology and ink
Coming the biggest, these distinguishing features possessed by metameric ink are gradually developed and are applied in field of anti-counterfeit technology, are mesh
Front anti-counterfeiting printing technology institute problem demanding prompt solution.
Summary of the invention:
To this end, it is an object of the invention to provide a kind of good concealment, be difficult to be replicated, effective time length and not changeableness
Metameric ink.
For achieving the above object, the present invention mainly adopts the following technical scheme that
A kind of false proof metameric ink, by percentage to the quality, including following components:
Metamerism pigment 50%-60%
Fluorine-silicon modified acrylic resin 14%-20%
Butyl acrylate 6%-9%
Epoxy resin 4%-8%
Near infrared absorbent 2%-3%
Isopropanol 3%-5%
Dehydrated alcohol 3%-5%
Deionized water 4%-8%
Sec-butylamine 0.5%-1.5%
Terpineol 0.5%-1%
Defoamer 0.2%-0.5%
Levelling agent 0.1%-0.3%
Further, described false proof metameric ink by percentage to the quality, including: the metamerism pigment of 55%,
The fluorine-silicon modified acrylic resin of 18%, the butyl acrylate of 5.5%, the epoxy resin of 5%, the near infrared absorbent of 2%, 3%
Isopropanol, the dehydrated alcohol of 5%, the deionized water of 4%, the sec-butylamine of 1.5%, the terpineol of 0.5%, the froth breaking of 0.2%
Agent and the levelling agent of 0.3%.
Further, described false proof metameric ink by percentage to the quality, including: the metamerism pigment of 60%,
The fluorine-silicon modified acrylic resin of 15%, the butyl acrylate of 6%, the epoxy resin of 4%, the near infrared absorbent of 2.2%, 3%
Isopropanol, the dehydrated alcohol of 3%, the deionized water of 4%, the sec-butylamine of 1%, the terpineol of 1%, the defoamer of 0.5% and
The levelling agent of 0.3%.
Further, described false proof metameric ink by percentage to the quality, including: the metamerism pigment of 50%,
The fluorine-silicon modified acrylic resin of 16%, the butyl acrylate of 8%, the epoxy resin of 8%, the near infrared absorbent of 2.7%, 4%
Isopropanol, the dehydrated alcohol of 3%, the deionized water of 6%, the sec-butylamine of 0.5%, the terpineol of 1.5%, the froth breaking of 0.2%
Agent and the levelling agent of 0.1%.
Further, described near infrared absorbent is the near infrared absorbent 4,4', 4 using ullmann reaction to synthesize "-
Three (p-dibutylamino) triphenylamine antimony hexafluoride hydrochlorate.
Further, described defoamer is Si modification polysiloxanes.
Present invention also offers a kind of method preparing false proof metameric ink, take each component according to mass percent,
Carry out mixing and stirring, it is thus achieved that false proof metameric ink.
Metameric ink prepared by the present invention shows same color under same light source, and its spectral signature curve is but
Different, under sun exposure, the ink of doping infrared absorbing agents is consistent with common ink visually color, but
Under infrared ray radiation, two kinds of ink show different colors.By test, two kinds of ink have different spectral signature songs
Line.Metameric ink the most of the present invention have good concealment, be difficult to be replicated, effective time length and not changeableness etc.
Advantage.
Present invention also offers a kind of printing process using false proof metameric ink, including step:
S1, metamerism pigment according to mass percent 55%, the fluorine-silicon modified acrylic resin of 18%, the third of 5.5%
Olefin(e) acid butyl ester, the epoxy resin of 5%, the near infrared absorbent of 2%, the isopropanol of 3%, the dehydrated alcohol of 5%, 4% go from
The levelling agent of sub-water, the sec-butylamine of 1.5%, the terpineol of 0.5%, the defoamer of 0.2% and 0.3% prepares false proof metamerism
Ink, and ensure that the viscosity of this false proof metameric ink is that 3# examines grace cup and measures the 18-20 second；
S2, the preparation common ink identical with color in step S1, and ensure that the viscosity of common ink is that 3# examines the survey of grace cup
The amount 15-20 second；
S3, employing offset printing technique are at 157g/m2Art paper on printing containing the ink strip shape code of infrared absorbing agents；
One layer of common ink is printed on common ink ink strip shape code in step s3 in S4, employing step S2；
False proof metameric ink in S5, employing step S1 is at 157g/m2Art paper curing ink bar code beyond
Region carries out picture and text printing, forms image-text area；
One layer of common ink is printed on common ink image-text area in step s 5 in S6, employing step S2；
S7, employing filter plate carry out face to the printing sample of metameric ink in step S4 and step S6 Yu common ink
Aberration does not observe judgement.
Present invention also offers a kind of printing process using false proof metameric ink, including step:
S1, the metamerism pigment according to mass percent 60%, the fluorine-silicon modified acrylic resin of 15%, the propylene of 6%
Acid butyl ester, the epoxy resin of 4%, the near infrared absorbent of 2.2%, the isopropanol of 3%, the dehydrated alcohol of 3%, 4% go from
The levelling agent of sub-water, the sec-butylamine of 1%, the terpineol of 1%, the defoamer of 0.5% and 0.3% prepares false proof metamerism oil
Ink, and ensure that the viscosity of this false proof metameric ink is that 3# examines grace cup and measures the 18-20 second；
S2, the preparation common ink identical with color in step S1, and ensure that the viscosity of common ink is that 3# examines the survey of grace cup
The amount 15-20 second；
S3, employing offset printing technique are at 157g/m2Art paper green pixel on false proof homochromy in print steps S1
Different spectrum ink；
False proof metameric ink in S4, employing step S1 is at 157g/m2Art paper on green pixel with outskirt
Territory carries out picture and text printing, forms image-text area；
One layer of common ink is printed on common ink image-text area in step s 4 in S5, employing step S2；
S6, employing filter plate carry out face to the printing sample of metameric ink in step S3 and step S5 Yu common ink
Aberration does not observe judgement.
Present invention also offers a kind of printing process using false proof metameric ink, including step:
S1, the metamerism pigment according to mass percent 50%, the fluorine-silicon modified acrylic resin of 16%, the propylene of 8%
Acid butyl ester, the epoxy resin of 8%, the near infrared absorbent of 2.7%, the isopropanol of 4%, the dehydrated alcohol of 3%, 6% go from
The levelling agent of sub-water, the sec-butylamine of 0.5%, the terpineol of 1.5%, the defoamer of 0.2% and 0.1% prepares false proof metamerism
Ink, and ensure that the viscosity of this false proof metameric ink is that 3# examines grace cup and measures the 18-20 second；
S2, the preparation common ink identical with color in step S1, and ensure that the viscosity of common ink is that 3# examines the survey of grace cup
The amount 15-20 second；
S3, employing offset printing technique are at 157g/m2Art paper on printing containing the ink strip shape code of infrared absorbing agents；
One layer of common ink is printed on common ink ink strip shape code in step s3 in S4, employing step S2；
False proof metameric ink in S5, employing step S1 is at 157g/m2Art paper curing ink bar code beyond
Region carries out picture and text printing, forms image-text area；
Common ink image-text area in step s 5 in S6, employing step S2 is to print common ink, shape on exterior domain
Become the figure identical with shape size in step S5；
S7, use by the infrared scanner printing sample to metameric ink in step S4 and step S6 Yu common ink
Product are scanned observing and judge.
The present invention uses offset mode interval printing metameric ink and common ink on art paper.Two kinds of ink exist
Under a certain light source irradiates, the viewed color of human eye has homogeny, but after changing light source, then observe two kinds of colors, meeting
Find all can change in form and aspect and contrast, it is easy to difference both ink.
The present invention prepares the leaflet that metameric ink typography completes and includes that metamerism is false proof, two-dimension code anti-counterfeit
And color-changing anti-counterfeit, it achieves the fusion in same false proof district of the multiple anti-counterfeiting technology, and false proof district presents under different light sources irradiate
Different colors, identifies easily and rich interest, can improve people's degree of recognition to product, make product have multiple anti-fake
Property, false proof intensity is high.
Accompanying drawing illustrates:
Fig. 1 is the schematic flow sheet one that the present invention uses the printing process of false proof metameric ink；
Fig. 2 is the schematic flow sheet two that the present invention uses the printing process of false proof metameric ink；
Fig. 3 is the schematic flow sheet three that the present invention uses the printing process of false proof metameric ink.
Detailed description of the invention:
For illustrating thought and the purpose of the present invention, below in conjunction with the drawings and specific embodiments, the present invention is done further
Explanation.
Metamerism phenomenon is owing to two kinds of colors also exist almost identical spectrum in the sensitizing range of the vision of people, so
And in the vision of people fails to understand the region of sense, have the biggest difference.That is under natural light irradiation, two kinds of ink
Printed matter color is identical, but after passing through specific apparatus, it appeared that difference between the two.Therefore the present invention is according to infrared
Absorbent selects suitable filter plate in the scope of region of ultra-red wavelength.Owing to this infrared absorbing agents has maximum suction at 980nm
Receive wavelength, then corresponding filter plate to have the transmitance of maximum in this region.
The invention provides a kind of false proof metameric ink, by percentage to the quality, including following components:
Metamerism pigment 50%-60%
Fluorine-silicon modified acrylic resin 14%-20%
Butyl acrylate 6%-9%
Epoxy resin 4%-8%
Near infrared absorbent 2%-3%
Isopropanol 3%-5%
Dehydrated alcohol 3%-5%
Deionized water 4%-8%
Sec-butylamine 0.5%-1.5%
Terpineol 0.5%-1%
Defoamer 0.2%-0.5%
Levelling agent 0.1%-0.3%
The gross mass percentage ratio of above material is 100%.
Wherein said near infrared absorbent is the near infrared absorbent 4,4' using ullmann reaction to synthesize, 4 " and-three
(p-dibutylamino) triphenylamine antimony hexafluoride hydrochlorate；Described defoamer is Si modification polysiloxanes.
Present invention also offers a kind of method preparing false proof metameric ink, take each component according to mass percent,
Carry out mixing and stirring, it is thus achieved that false proof metameric ink.
Embodiment one
Present embodiment discloses a kind of false proof metameric ink, by percentage to the quality, including following components: 55%
Metamerism pigment, the fluorine-silicon modified acrylic resin of 18%, the butyl acrylate of 5.5%, the epoxy resin of 5%, 2% the reddest
Outer absorbent, the isopropanol of 3%, the dehydrated alcohol of 5%, the deionized water of 4%, the sec-butylamine of 1.5%, the terpineol of 0.5%,
The defoamer of 0.2% and the levelling agent of 0.3%.
As it is shown in figure 1, present embodiments provide a kind of printing process using false proof metameric ink, including step:
S1, prepare false proof metameric ink according to above-mentioned mass percent, and ensure this false proof metameric ink
Viscosity be 3# examine grace cup measure the 18-20 second；
S2, the preparation common ink identical with color in step S1, and ensure that the viscosity of common ink is that 3# examines the survey of grace cup
The amount 15-20 second；
S3, employing offset printing technique are at 157g/m2Art paper on printing containing the ink strip shape code of infrared absorbing agents；
One layer of common ink is printed on common ink ink strip shape code in step s3 in S4, employing step S2；
False proof metameric ink in S5, employing step S1 is at 157g/m2Art paper curing ink bar code beyond
Region carries out picture and text printing, forms image-text area；
One layer of common ink is printed on common ink image-text area in step s 5 in S6, employing step S2；
S7, employing filter plate carry out face to the printing sample of metameric ink in step S4 and step S6 Yu common ink
Aberration does not observe judgement.
The present embodiment is by common ink printing and covers on the bar code containing the ink of infrared absorbing agents, in day illumination
Penetrate down, can only see the shape that common ink prints out, and the bar code of anti-forgery ink cannot be seen, if being swept by near-infrared
Retouch the detection of instrument, just can read its bar code, tell truth from falsehood.
Embodiment two
Present embodiment discloses a kind of false proof metameric ink, by percentage to the quality, including: the metamerism of 60%
Pigment, the fluorine-silicon modified acrylic resin of 15%, the butyl acrylate of 6%, the epoxy resin of 4%, the near infrared absorption of 2.2%
Agent, the isopropanol of 3%, the dehydrated alcohol of 3%, the deionized water of 4%, the sec-butylamine of 1%, the terpineol of 1%, 0.5% disappear
Infusion and the levelling agent of 0.3%.
As in figure 2 it is shown, present embodiments provide a kind of printing process using false proof metameric ink, including step:
S1, prepare false proof metameric ink according to above-mentioned mass percent, and ensure this false proof metameric ink
Viscosity be 3# examine grace cup measure the 18-20 second；
S2, the preparation common ink identical with color in step S1, and ensure that the viscosity of common ink is that 3# examines the survey of grace cup
The amount 15-20 second；
S3, employing offset printing technique are at 157g/m2Art paper green pixel on false proof homochromy in print steps S1
Different spectrum ink；
False proof metameric ink in S4, employing step S1 is at 157g/m2Art paper on green pixel with outskirt
Territory carries out picture and text printing, forms image-text area；
One layer of common ink is printed on common ink image-text area in step s 4 in S5, employing step S2；
S6, employing filter plate carry out face to the printing sample of metameric ink in step S3 and step S5 Yu common ink
Aberration does not observe judgement.
The present embodiment metamerism anti-forgery ink printing also covers on green pixel, under natural light irradiation, green
Pixel can manifest out, but the red filter plate of application observes this printed matter, owing to this filter plate is red, can absorb green
The light of wave band, the light of red band passes through, so the image scribbling green pixel of bottom, darkens, and prints
The color of image of infrared invisible ink brightens, and forms sharp contrast, can tell truth from falsehood.
The present embodiment is by using offset printing technique to print again on the image-text area being printed with metamerism anti-forgery ink
One layer of common ink of brush, and observe two kinds of ink effects of contrast.Metamerism anti-forgery ink is with fixing and qualify
Observer and fixed light source premised on, change any one condition therein, two kinds of ink will present different colors.
Embodiment three
Present embodiment discloses a kind of false proof metameric ink, including: metamerism pigment, the silicon of 16% of 50% change
Property acrylic resin, the butyl acrylate of 8%, the epoxy resin of 8%, the near infrared absorbent of 2.7%, the isopropanol of 4%,
The dehydrated alcohol of 3%, the deionized water of 6%, the sec-butylamine of 0.5%, the terpineol of 1.5%, the defoamer of 0.2% and 0.1%
Levelling agent.
As it is shown on figure 3, present embodiments provide a kind of printing process using false proof metameric ink, including step:
S1, the metamerism pigment according to mass percent 50%, the fluorine-silicon modified acrylic resin of 16%, the propylene of 8%
Acid butyl ester, the epoxy resin of 8%, the near infrared absorbent of 2.7%, the isopropanol of 4%, the dehydrated alcohol of 3%, 6% go from
The levelling agent of sub-water, the sec-butylamine of 0.5%, the terpineol of 1.5%, the defoamer of 0.2% and 0.1% prepares false proof metamerism
Ink, and ensure that the viscosity of this false proof metameric ink is that 3# examines grace cup and measures the 18-20 second；
S2, the preparation common ink identical with color in step S1, and ensure that the viscosity of common ink is that 3# examines the survey of grace cup
The amount 15-20 second；
S3, employing offset printing technique are at 157g/m2Art paper on printing containing the ink strip shape code of infrared absorbing agents；
One layer of common ink is printed on common ink ink strip shape code in step s3 in S4, employing step S2；
False proof metameric ink in S5, employing step S1 is at 157g/m2Art paper curing ink bar code beyond
Region carries out picture and text printing, forms image-text area；
Common ink image-text area in step s 5 in S6, employing step S2 is to print common ink, shape on exterior domain
Become the figure identical with shape size in step S5；
S7, use by the infrared scanner printing sample to metameric ink in step S4 and step S6 Yu common ink
Product are scanned observing and judge.
The present embodiment by the bar code printing containing infrared absorbing agents at bottom, then common ink on printed thereon, people
Directly observe in the case of not taking any instrument or measure, can only observe as broad as long image, but the containing of bottom
The ink having infrared absorbing agents can be detected by infrared scanner, it is possible to visualise goes out Antiforge bar code.
Metameric ink prepared by the present invention shows same color under same light source, and its spectral signature curve is but
Different, under sun exposure, the ink of doping infrared absorbing agents is consistent with common ink visually color, but
Under infrared ray radiation, two kinds of ink show different colors.By test, two kinds of ink have different spectral signature songs
Line.Metameric ink the most of the present invention have good concealment, be difficult to be replicated, effective time length and not changeableness etc.
Advantage.
In sum, the present invention passes through the metameric ink to preparation and uses this ink according to the printing of the present invention
The leaflet properties that technique completes detects and evaluates, its anti-counterfeiting technology includes that metamerism is false proof, two-dimension code anti-counterfeit,
The technology such as color-changing anti-counterfeit, and achieve the fusion in same false proof district of the multiple anti-counterfeiting technology, make product have multiple anti-fake,
False proof intensity is high.False proof district presents different colors under different light sources irradiate, and identifies easily and rich interest, can improve people
The degree of recognition to product.
It is above provided by the present invention for false proof metameric ink and the preparation of this metameric ink
Method and use the printing process of this metameric ink to be described in detail, specific case used herein is to this
Bright structural principle and embodiment are set forth, and above example is only intended to help to understand method and the core thereof of the present invention
Thought is thought；Simultaneously for one of ordinary skill in the art, according to the thought of the present invention, at detailed description of the invention and application model
Placing and all will change, in sum, this specification content should not be construed as limitation of the present invention.
Claims (10)
1. a false proof metameric ink, it is characterised in that by percentage to the quality, including following components:
False proof metameric ink the most as claimed in claim 1, it is characterised in that by percentage to the quality, including: 55%
Metamerism pigment, the fluorine-silicon modified acrylic resin of 18%, the butyl acrylate of 5.5%, the epoxy resin of 5%, 2% the reddest
Outer absorbent, the isopropanol of 3%, the dehydrated alcohol of 5%, the deionized water of 4%, the sec-butylamine of 1.5%, the terpineol of 0.5%,
The defoamer of 0.2% and the levelling agent of 0.3%.
False proof metameric ink the most as claimed in claim 1, it is characterised in that by percentage to the quality, including: 60%
Metamerism pigment, the fluorine-silicon modified acrylic resin of 15%, the butyl acrylate of 6%, the epoxy resin of 4%, 2.2% the reddest
Outer absorbent, the isopropanol of 3%, the dehydrated alcohol of 3%, the deionized water of 4%, the sec-butylamine of 1%, the terpineol of 1%,
The defoamer of 0.5% and the levelling agent of 0.3%.
False proof metameric ink the most as claimed in claim 1, it is characterised in that by percentage to the quality, including: 50%
Metamerism pigment, the fluorine-silicon modified acrylic resin of 16%, the butyl acrylate of 8%, the epoxy resin of 8%, 2.7% the reddest
Outer absorbent, the isopropanol of 4%, the dehydrated alcohol of 3%, the deionized water of 6%, the sec-butylamine of 0.5%, the terpineol of 1.5%,
The defoamer of 0.2% and the levelling agent of 0.1%.
5. the false proof metameric ink as described in Claims 1 to 4 is arbitrary, it is characterised in that described near infrared absorbent is
The near infrared absorbent 4,4' that employing ullmann reaction synthesizes, 4 "-three (p-dibutylamino) lithium metaantimmonic acid of triphenylamine
Salt.
6. the false proof metameric ink as described in Claims 1 to 4 is arbitrary, it is characterised in that described defoamer is Si modification
Polysiloxanes.
7. the method for the false proof metameric ink prepared as described in Claims 1 to 4 is arbitrary, it is characterised in that according to
Mass percent takes each component, carries out mixing and stirring, it is thus achieved that false proof metameric ink.
8. the printing process using false proof metameric ink as claimed in claim 2, it is characterised in that include step
Rapid:
S1, prepare false proof metameric ink according to the mass percent described in claim 2, and ensure this false proof metamerism
The viscosity of ink is that 3# examines the grace cup measurement 18-20 second；
S2, the preparation common ink identical with color in step S1, and ensure that the viscosity of common ink is that 3# examines grace cup measurement 15-
20 seconds；
S3, employing offset printing technique are at 157g/m2Art paper on printing containing the ink strip shape code of infrared absorbing agents；
One layer of common ink is printed on common ink ink strip shape code in step s3 in S4, employing step S2；
False proof metameric ink in S5, employing step S1 is at 157g/m2The entering with exterior domain of art paper curing ink bar code
Row picture and text print, and form image-text area；
One layer of common ink is printed on common ink image-text area in step s 5 in S6, employing step S2；
S7, employing filter plate carry out colour-difference to the printing sample of metameric ink in step S4 and step S6 Yu common ink
Do not observe judgement.
9. one kind uses right such as to want the printing process of the false proof metameric ink as described in 3, it is characterised in that include step:
S1, prepare false proof metameric ink according to the mass percent described in claim 3, and ensure this false proof metamerism
The viscosity of ink is that 3# examines the grace cup measurement 18-20 second；
S2, the preparation common ink identical with color in step S1, and ensure that the viscosity of common ink is that 3# examines grace cup measurement 15-
20 seconds；
S3, employing offset printing technique are at 157g/m2Art paper green pixel on false proof metamerism oil in print steps S1
Ink；
False proof metameric ink in S4, employing step S1 is at 157g/m2Art paper on the carrying out with exterior domain of green pixel
Picture and text print, and form image-text area；
One layer of common ink is printed on common ink image-text area in step s 4 in S5, employing step S2；
S6, employing filter plate carry out colour-difference to the printing sample of metameric ink in step S3 and step S5 Yu common ink
Do not observe judgement.
10. the printing process using false proof metameric ink as claimed in claim 4, it is characterised in that include step
Rapid:
S1, prepare false proof metameric ink according to the mass percent described in claim 4, and ensure this false proof metamerism
The viscosity of ink is that 3# examines the grace cup measurement 18-20 second；
S2, the preparation common ink identical with color in step S1, and ensure that the viscosity of common ink is that 3# examines grace cup measurement 15-
20 seconds；
S3, employing offset printing technique are at 157g/m2Art paper on printing containing the ink strip shape code of infrared absorbing agents；
One layer of common ink is printed on common ink ink strip shape code in step s3 in S4, employing step S2；
False proof metameric ink in S5, employing step S1 is at 157g/m2The entering with exterior domain of art paper curing ink bar code
Row picture and text print, and form image-text area；
S6, use the common ink image-text area in step s 5 in step S2 to print common ink on exterior domain, formed with
The figure that in step S5, shape size is identical；
The printing sample of metameric ink in step S4 and step S6 with common ink is swept by S7, employing infrared scanner
Retouch observation to judge.
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| CN109740712B (en) * | 2018-12-21 | 2022-03-08 | 北京印刷学院 | Two-dimensional code for hiding anti-counterfeiting mark image |
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| CN109726788B (en) * | 2018-12-21 | 2022-03-04 | 北京印刷学院 | Light and shade double-code two-dimensional code with hidden metamerism |
| CN109376832B (en) * | 2018-12-21 | 2023-06-27 | 北京印刷学院 | Triple anti-counterfeiting two-dimensional code embedded with anti-counterfeiting mark image and digital fluorescent image |
| CN109760436A (en) * | 2018-12-21 | 2019-05-17 | 北京印刷学院 | The page covers invisible signature anti-counterfeit method of credentials |
| CN109726789B (en) * | 2018-12-21 | 2023-06-27 | 北京印刷学院 | Anti-fake two-dimensional code with hidden digital signature |
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| CN101244679A (en) * | 2007-02-15 | 2008-08-20 | 中国印钞造币总公司 | Method for implementing false prevention by using metamerism magnetism to match with printing ink |
| US8460781B2 (en) * | 2007-06-05 | 2013-06-11 | Xerox Corporation | Infrared encoding of security elements using standard xerographic materials |
| CN102876126B (en) * | 2012-09-29 | 2014-08-20 | 中国印钞造币总公司 | Gravure fluorescent infrared matching printing ink for engraved intaglio plate printing machine |
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