CN111055609A - Anti-counterfeiting self-identification method based on transparent window - Google Patents
Anti-counterfeiting self-identification method based on transparent window Download PDFInfo
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- CN111055609A CN111055609A CN201911365430.2A CN201911365430A CN111055609A CN 111055609 A CN111055609 A CN 111055609A CN 201911365430 A CN201911365430 A CN 201911365430A CN 111055609 A CN111055609 A CN 111055609A
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- transparent window
- visual pattern
- printing
- security document
- self
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- 230000000007 visual effect Effects 0.000 claims abstract description 95
- 229920003023 plastic Polymers 0.000 claims abstract description 30
- 239000004033 plastic Substances 0.000 claims abstract description 29
- 239000002131 composite material Substances 0.000 claims abstract description 11
- 238000010329 laser etching Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000007639 printing Methods 0.000 claims description 54
- 239000000758 substrate Substances 0.000 claims description 33
- 238000007645 offset printing Methods 0.000 claims description 27
- 238000007650 screen-printing Methods 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 9
- 238000007747 plating Methods 0.000 claims description 8
- 238000007644 letterpress printing Methods 0.000 claims description 7
- 239000000123 paper Substances 0.000 claims description 6
- 238000007646 gravure printing Methods 0.000 claims description 3
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 10
- 238000007689 inspection Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000003287 optical Effects 0.000 description 5
- 238000005070 sampling Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 241000233805 Phoenix Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000875 corresponding Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 230000000737 periodic Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/351—Translucent or partly translucent parts, e.g. windows
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/40—Manufacture
- B42D25/405—Marking
- B42D25/43—Marking by removal of material
- B42D25/435—Marking by removal of material using electromagnetic radiation, e.g. laser
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/40—Manufacture
- B42D25/45—Associating two or more layers
- B42D25/465—Associating two or more layers using chemicals or adhesives
- B42D25/47—Associating two or more layers using chemicals or adhesives using adhesives
Abstract
The invention discloses an anti-counterfeiting self-identification method based on a transparent window, which is characterized in that a security document product base material is a plastic base material or a plastic and paper composite base material, a transparent window area with the area not less than 3mm x 3mm is established on the security document product, a first visual pattern is formed in the area by adopting a laser etching mode, the transparent window area of the security document is turned over, the specific pattern can be mutually nested and overlapped with a second visual pattern presented in another appointed area on the back of the specific pattern to form a third set target visual pattern, including but not limited to letter patterns, digital patterns, geometric patterns or other set patterns. The identification process can be carried out without the help of instruments and equipment, and the operation is simple and convenient, so that the convenience of identifying the authenticity of the product by mass inspection is effectively improved, and the method has a good application prospect.
Description
Technical Field
The invention relates to the technical field of anti-counterfeiting, in particular to an anti-counterfeiting self-identification method based on a transparent window.
Background
Currently, many countries in the world use plastic substrates for printing high-end security documents such as banknotes and national certificates. Compared with paper base, plastic base materials have the advantages of being difficult to forge, resistant to dirt, temperature and damage, capable of prolonging circulation time and the like, and are also concerned by more and more countries in the world. Plastic banknotes are issued and circulated in many countries, such as australia, canada, switzerland and singapore … …, and plastic substrates are also used in national documents, such as passports, which is a major trend in the development of high-end security printing fields all over the world.
The obvious characteristic of distinguishing the plastic substrate security documents from paper-based products is that a transparent window can be established on the ticket surface, and the transparent window is utilized to carry out loading of a novel anti-counterfeiting technology, which is also a key direction for researching and developing the plastic substrate security anti-counterfeiting technology in all countries in the world at present.
ZL201410311286.5 describes a plastic substrate for making a security document and a method for making the same, comprising a polymer support layer, a polymer mold layer attached to the surface of the polymer support layer, wherein the polymer mold layer is partially missing to expose the polymer support layer, and the surface of the polymer support layer is exposed to form a transparent window with a concave-convex hand feeling. The transparent window with concave-convex hand feeling can not be formed by copying or printing on the plastic film, so that the plastic base material has higher anti-counterfeiting capability.
CN201710089613.0 describes a security element and an optical security product, including at least a partially transparent substrate having a first surface and a second surface opposite to each other, and a security image formed on the first surface of the substrate, wherein the security image includes a plurality of imaging pixel sets and is arranged in a non-periodic and/or non-symmetric axis, so as to form a sampling composite layer with optical characteristics on the second surface, and the sampling composite layer is adapted to present a target visual image corresponding to the imaging pixel sets through the transparent portion of the substrate and the sampling composite layer. The visual image is not limited to letters, numbers, geometry, and other patterns.
WO2008098739 describes a security element for security documents for value documents of bank notes, identification cards or the like, which can be applied by stamping or laser cutting, preferably onto a small window opening of a paper, plastic film or a composite layer-forming transparent substrate, the first surface of which is provided with at least one first security feature and the second, opposite surface of which is provided with at least one second security feature. The first security feature has spaced opaque pattern elements, which may be words, numbers, symbols or/and icons arranged in a mesh. At least one part of the side of the pattern basic elements facing away from the light-transmitting substrate is provided with a first information element which is in color contrast with the pattern basic elements. The second security feature has a second information element which is arranged overlapping the pattern elements and protrudes at least on one side beyond the respective pattern element and is in color contrast with said pattern element. The first and second information elements together present at least one letter, number, character, icon and/or at least one graphic, respectively, to a viewer.
US6761377B2 describes a self-authenticating security document device and its security document, characterised in that the banknote comprises a plastics substrate forming a marked flexible sheet having a window of transparent plastics material, a security device for authentication being provided on a second laterally spaced portion of the sheet, the sheet being bent or folded to cause said window to register the security device, the self-authenticating device being operable to read a region of microprinted security information through an optical lens, in which embodiment the self-authenticating device and said security transparent window form a moire inducing pattern.
The present invention relates to a method for developing anti-fake element based on transparent window, and is characterized by that it mainly utilizes the utilization of self-body property of material and loads optical property element on the transparent window, and combines the transparent window technology with printing content on the safety document, and between front and back production processes, different implement means and front and back surfaces of the document a certain relation is established between them so as to further raise the combined anti-fake property of safety product, and its identification process can effectively raise the convenience for public to check said safety feature or identify the true or false of said product.
Disclosure of Invention
The invention provides an anti-counterfeiting self-identification method based on a transparent window, which is characterized in that a transparent window area is established on a security document product, a first visual pattern is formed in the area by adopting a laser etching mode, the transparent window area of the security document is turned over, and the specific pattern and a second visual pattern presented in another designated area on the back surface of the specific pattern can be mutually nested and overlapped to form a set target visual pattern III.
Preferably, the security document product substrate is at least partially light transmissive, including but not limited to PET plastic substrates, PE plastic substrates, PVC plastic substrates, PC plastic substrates, plastic composite substrates, plastic and paper composite substrates.
Preferably, the area of the transparent window region is not less than 3mm x 3mm, and the visual pattern presented in the transparent window region is preferably laser etched, but plating, air pressure, laser perforation, offset printing, letterpress printing, gravure printing, silk screen printing or digital printing is not excluded.
Preferably, the base material of the security document product can be bent by 180 degrees, so that the visual pattern I in the transparent window area and the visual pattern II presented at the designated position are matched and nested with each other, and the self-identification process of the set target visual pattern III is completed.
Preferably, the second visual pattern is printed by offset printing, relief printing, intaglio printing, screen printing, or a combination of two or more types of printing.
Preferably, the second visual pattern can be printed by using single-color ink, multi-color ink overprint printing, colorless fluorescent ink, colored ink and colorless fluorescent ink.
Preferably, the first visual pattern and the second visual pattern are formed on two sides of the surface of the security document product; or, the first visual pattern and the second visual pattern are formed on the same side of the surface of the security document product, and then different implementation means must be adopted.
Preferably, the first visual pattern of the transparent window area and the second visual pattern presented at the designated position can be mutually nested under a certain set angle, and the graphics are mutually overlapped or overlapped to form a set target visual pattern three, including but not limited to letter patterns, number patterns, geometric patterns or other set graphics.
Preferably, the transparent window based anti-counterfeiting self-identification method is applied to security document products, including banknotes, passports, identity card, money orders, tax banderoles, securities, certificates, invoices, receipts, trademarks, contracts and commercial certificates.
The anti-counterfeiting self-identification method based on the transparent window in the technical scheme is different from the conventional anti-counterfeiting technology related to the transparent window with the emphasis on material characteristics and optical element loading, the transparent window technology is combined with the printing content on the security document, two groups of specific patterns matched with each other are formed on two sides of the surface of the security document in different modes, so that the presentation of the preset pattern effect or the extraction of the designated pattern information are realized, and a certain relation is established between the front production process, the back production process, different implementation means and the front side and the back side of the document, so that the combined anti-counterfeiting characteristic of the security product is further improved. The identification process can effectively improve the convenience of mass inspection of the safety features and further identification of the authenticity of the product without additionally using instrument equipment.
Drawings
FIG. 1 is a schematic diagram of the operation of the present invention;
FIG. 2 is an effect diagram of embodiment 1 of the present invention;
FIG. 3 is an effect diagram of embodiment 2 of the present invention;
FIG. 4 is a graph showing the effects of embodiment 3 of the present invention;
fig. 5 is an effect diagram of embodiment 4 of the present invention.
Fig. 6 is an effect diagram of embodiment 5 of the present invention.
Fig. 7 is an effect diagram of embodiment 6 of the present invention.
Detailed Description
The following describes an anti-counterfeit self-identification method based on a transparent window in detail with reference to the listed drawings.
Fig. 1 provides an operation schematic diagram of an anti-counterfeiting self-identification method based on a transparent window, a transparent window area is established on a security document product, a first visual pattern is formed in the area by adopting a laser etching mode, the transparent window area of the security document is turned over, and the specific pattern and a second visual pattern presented in another designated area on the back surface of the specific pattern can be mutually nested and overlapped to form a third set target visual pattern.
Further, to achieve the functional features of openly folding and turning, the substrate of the security document product is at least partially transparent, including but not limited to PET plastic substrate, PE plastic substrate, PVC plastic substrate, PC plastic substrate, plastic composite substrate, plastic and paper composite substrate; the base material of the safety document product can be bent by 180 degrees, so that the visual pattern I in the transparent window area and the visual pattern II shown in the appointed position are matched and nested with each other, and the self-identification process of the set target visual pattern III is completed. The first visual pattern in the transparent window area and the second visual pattern in the designated position can be mutually nested under a certain set angle, and the patterns are mutually overlapped or subtracted to form a set target visual pattern three, including but not limited to letter patterns, number patterns, geometric patterns or other set patterns.
Further, the area of the transparent window region is not less than 3mm x 3mm, and the visual pattern presented in the transparent window region is preferably laser etched, but electroplating, air pressure, laser perforation, offset printing, letterpress printing, gravure printing, silk screen printing or digital printing is not excluded. The printing mode of the visual pattern II can be offset printing, letterpress printing, intaglio printing and silk-screen printing, and can also be a combination of two or more printing modes; the printing can be carried out by adopting single-color ink, or by adopting multi-color ink overprinting printing, or by adopting colorless fluorescent ink, or by adopting colored ink and colorless fluorescent ink overprinting printing.
Furthermore, a first visual pattern and a second visual pattern are formed on two sides of the surface of the security document product; or, the first visual pattern and the second visual pattern are formed on the same side of the surface of the security document product, and then different implementation means must be adopted.
Further, the application of the transparent window based anti-counterfeiting self-identification method in security document products, including bank notes, passports, identity card, money orders, tax receipts, securities, certificates, invoices, receipts, trademarks, contracts and commercial certificates.
In embodiment 1 shown in fig. 2, a first visual pattern is formed in the transparent window area on the front side of the security document by laser etching; forming a second visual pattern on the back of the security document by adopting an offset printing mode; turning over the transparent window area of the security document, the first visual pattern and the second visual pattern on the back can be mutually nested and overlapped to form a third set target visual pattern, namely a complete letter pattern 'CN'.
The visual pattern is preferably laser etched, but plating, air pressure, laser perforation, offset printing, letterpress, gravure, screen printing or digital printing are not excluded. The second visual pattern may be formed by offset printing, or by various forms such as relief printing, intaglio printing, screen printing, or the like.
In example 2 shown in fig. 3, in the area of the transparent window on the front side of the security document, a first visual pattern is formed by laser etching: irregular dot matrix patterns where information is difficult to read; forming a second visual pattern on the back of the security document by adopting an offset printing mode, wherein the second visual pattern is also an irregular dot matrix pattern which is difficult to read information; turning over the transparent window area of the security document, the first visual pattern and the second visual pattern on the back can be mutually nested and overlapped to form a third set target visual pattern, namely, the display information, namely, the digital pattern '2019'.
The visual pattern is preferably laser etched, but plating, air pressure, laser perforation, offset printing, letterpress, gravure, screen printing or digital printing are not excluded. The second visual pattern can be formed by offset printing, relief printing, intaglio printing, screen printing and other printing modes, or by combination of two or more printing modes.
In embodiment 3 shown in fig. 4, a first visual pattern is formed in the transparent window area on the front side of the security document by laser etching; forming a second visual pattern on the back of the security document by adopting an offset printing mode; turning over the transparent window area of the security document, the first visual pattern and the second visual pattern on the back can be mutually nested and overlapped, the superposition area forms a pattern, the pattern of the non-printing area is highlighted, and the set target visual pattern III, namely the information letter pattern A, is formed.
The visual pattern is preferably laser etched, but plating, air pressure, laser perforation, offset printing, letterpress, gravure, screen printing or digital printing are not excluded. The second visual pattern can be formed by offset printing, relief printing, intaglio printing, screen printing and other printing modes, or by combination of two or more printing modes.
In embodiment 4 shown in fig. 5, a first visual pattern is formed in the transparent window area on the front side of the security document by laser etching; forming a visual pattern II on the back of the security document by adopting three-color or more overprint offset printing modes or a combination of multiple printing modes; turning over the transparent window area of the security document, the first visual pattern and the second back visual pattern can be mutually nested and overlapped to form a third set target visual pattern, namely, a delicate and complex 'phoenix' pattern is displayed.
The visual pattern is preferably laser etched, but plating, air pressure, laser perforation, offset printing, letterpress, gravure, screen printing or digital printing are not excluded. The formation of the second visual pattern can select an offset printing mode of multi-color overprinting, and can also select the combination of two or more printing modes such as offset printing, letterpress printing, intaglio printing, silk screen printing and the like; the color ink can be used for printing, the colorless fluorescent ink can be used for printing, and the color ink and the colorless fluorescent ink can be used for overprinting printing.
In embodiment 5 shown in fig. 6, a laser etching method is used to form a visual pattern "diamond pattern" in the transparent window area on the front side of the security document; printing with colorless fluorescent ink on the back of the security document in an offset printing mode, and making visible visual patterns with two 'moire' under the UV excitation light with the wavelength of 235-; turning over the transparent window area of the security document, under the UV excitation light with the wavelength of 235-380nm, enabling the first visual pattern and the second visual pattern on the back to be mutually embedded and overlapped to form a third set target visual pattern: traditional paper-cut lucky pattern.
The visual pattern is preferably laser etched, but plating, air pressure, laser perforation, offset printing, letterpress, gravure, screen printing or digital printing are not excluded. The second visual pattern can be formed by selecting an offset printing mode of monochromatic fluorescence or multicolor fluorescence overprinting, or selecting an offset printing mode of combining colorless fluorescence and colored fluorescence, or selecting a combination of colorless fluorescence offset printing and a plurality of printing modes such as letterpress printing, intaglio printing, silk screen printing and the like.
In embodiment 6 shown in fig. 7, a first visual pattern is formed in the transparent window area on the front side of the security document by laser etching; forming a second visual pattern on the back of the security document by adopting an offset printing mode; turning over the transparent window area of the security document, wherein the first visual pattern and the second visual pattern on the back can be mutually embedded and overlapped to form a third set target visual pattern: a complete two-dimensional code pattern is formed, and the two-dimensional code is scanned by a mobile phone and can be linked to a China people bank website http:// www.pbc.gov.cn.
The visual pattern is preferably laser etched, but plating, air pressure, laser perforation, offset printing, letterpress, gravure, screen printing or digital printing are not excluded. The second visual pattern can be formed by an offset printing mode, and can also be formed by a plurality of modes such as relief printing, intaglio printing, silk screen printing and the like, even the combination of two or more printing modes; the color ink can be used for printing, the colorless fluorescent ink can also be used for printing, and the color ink and the colorless fluorescent ink can also be used for overprinting and printing. The application of the two-dimensional code can be expanded to more application scenes, such as the realization of on-line code checking detection and detailed analysis of a detection method, and other more application examples for the purposes of anti-counterfeiting, learning, publicity and the like.
The anti-counterfeiting self-identification method based on the transparent window combines the transparent window technology with the printing content on the security document, forms two groups of specific patterns which are matched with each other in different modes on two sides of the surface of the security document, thereby realizing the presentation of the predetermined pattern effect or extracting the appointed pattern information, and establishing a certain relation between the front production process and the back production process, different implementation means and the front surface and the back surface of the document, thereby further improving the combined anti-counterfeiting characteristic of the security product. The identification process can effectively improve the convenience of mass inspection of the safety features and further identification of the authenticity of the product without additionally using instrument equipment.
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 (9)
1. An anti-counterfeiting self-identification method based on a transparent window is characterized in that a transparent window area is established on a security document product, a first visual pattern is formed in the area in a laser etching mode, the transparent window area of the security document is turned over, and the specific pattern and a second visual pattern presented in another designated area on the back surface of the specific pattern can be mutually nested and overlapped to form a third set target visual pattern.
2. The transparent window-based anti-counterfeiting self-identification method according to claim 1, wherein the security document product substrate is at least partially transparent, including but not limited to PET plastic substrate, PE plastic substrate, PVC plastic substrate, PC plastic substrate, plastic composite substrate, plastic and paper composite substrate.
3. The transparent window-based anti-counterfeiting self-identification method according to claim 1, wherein the area of the transparent window region is not less than 3mm x 3mm, and the visual pattern presented on the transparent window region is preferably formed by laser etching, but plating, air compression, laser perforation, offset printing, letterpress printing, gravure printing, silk screen printing or digital printing is not excluded.
4. The anti-counterfeiting self-identification method based on the transparent window as claimed in claim 1, wherein the security document product substrate can be bent by 180 degrees to realize the mutual matching and nesting of the first visual pattern of the transparent window region and the second visual pattern presented at the designated position, thereby completing the self-identification process of the set third target visual pattern.
5. The self-identification anti-counterfeiting method based on the transparent window as claimed in claim 1, wherein the second visual pattern is printed by offset printing, letterpress printing, intaglio printing, screen printing, or a combination of two or more printing methods.
6. The self-identification anti-counterfeiting method based on the transparent window as claimed in claim 1, wherein the visual pattern II can be printed by using monochromatic ink, multicolor ink overprint printing, colorless fluorescent ink, colored ink and colorless fluorescent ink.
7. The transparent window-based anti-counterfeiting self-identification method according to claim 1, wherein the first visual pattern and the second visual pattern are formed on two sides of the surface of the security document product; or, the first visual pattern and the second visual pattern are formed on the same side of the surface of the security document product, and then different implementation means must be adopted.
8. The anti-counterfeiting self-identification method based on the transparent window as claimed in claim 1, wherein the first visual pattern in the transparent window area and the second visual pattern presented at the designated position can be nested with each other under a certain set angle, and the patterns are overlapped or subtracted from each other to form a set target visual pattern three, including but not limited to letter patterns, number patterns, geometric patterns or other set patterns.
9. Use of the transparent window based anti-counterfeiting self-identification method according to any one of claims 1 to 8 in security document products including banknotes, passports, identification cards, money orders, tax banderoles, securities, certificates, invoices, receipts, trademarks, contracts and business certificates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911365430.2A CN111055609A (en) | 2019-12-26 | 2019-12-26 | Anti-counterfeiting self-identification method based on transparent window |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911365430.2A CN111055609A (en) | 2019-12-26 | 2019-12-26 | Anti-counterfeiting self-identification method based on transparent window |
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| CN111055609A true CN111055609A (en) | 2020-04-24 |
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| CN201911365430.2A Pending CN111055609A (en) | 2019-12-26 | 2019-12-26 | Anti-counterfeiting self-identification method based on transparent window |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112289171A (en) * | 2020-09-30 | 2021-01-29 | 北京德弦科技有限公司 | Data identification processing, reading and detecting method and device for transparent medium |
| CN112878111A (en) * | 2021-01-11 | 2021-06-01 | 中钞印制技术研究院有限公司 | Anti-counterfeiting paper and preparation method thereof |
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Application publication date: 20200424 |