CN107038950A - A kind of color-changing anti-counterfeit mark - Google Patents
A kind of color-changing anti-counterfeit mark Download PDFInfo
- Publication number
- CN107038950A CN107038950A CN201710420945.2A CN201710420945A CN107038950A CN 107038950 A CN107038950 A CN 107038950A CN 201710420945 A CN201710420945 A CN 201710420945A CN 107038950 A CN107038950 A CN 107038950A
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- Prior art keywords
- crystal layer
- cholesteric
- liquid crystal
- layer
- color
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
- G09F3/02—Forms or constructions
- G09F3/0291—Labels or tickets undergoing a change under particular conditions, e.g. heat, radiation, passage of time
- G09F3/0294—Labels or tickets undergoing a change under particular conditions, e.g. heat, radiation, passage of time where the change is not permanent, e.g. labels only readable under a special light, temperature indicating labels and the like
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Polarising Elements (AREA)
Abstract
The invention discloses a kind of color-changing anti-counterfeit mark, include cholesteric crystal layer, colourless, the transparent layer of the nematic liquid crystal with half wavelength phase difference is partially covered with the cholesteric crystal layer, the part that can be achieved to differentiate and cover and be not covered with the nematic liquid crystal layer in the cholesteric crystal layer is observed by rotatory polarization piece.The present invention can either realize optically variable effect under visible ray, also can show naked eyes invisible pattern in the lower observation of rotatory polarization piece, realize double anti-forge effect, effectively raise the antifalse effect of light change technology, considerably increase imitation difficulty.
Description
Technical field
The present invention relates to field of anti-counterfeit technology, and in particular to a kind of color-changing anti-counterfeit mark.
Background technology
Due to duplicating and printing technology is continued to develop, the forgery phenomenon to some important certificates, file is increasing, be
Prevent from palming off and forge, anti-fake product can be all set on these files to realize antiforge function, is easy to enter certificate and file
Row authenticity verification, prevents from forging.Wherein, it is the important means of forgery mode such as to prevent from duplicating, scan that light, which becomes technology,.Due to light
There are different colors in different angles, the conversion for becoming the color that material has in another angular light is can all visually
See and readily identified, contribute to user to distinguish forged certificate, it is therefore prevented that the complete duplication of information.
But with the development and diffusion of technology, some anti-counterfeiting technologies are also familiar with by people more and more in itself, when
Adulterator is so included, so that the anti-counterfeiting performance of anti-counterfeiting technology dies down.Therefore, optically variable anti-counterfeiting skill must further develop, increase
Technical threshold and imitation difficulty.
The content of the invention
In view of the shortcomings of the prior art, the present invention is intended to provide a kind of color-changing anti-counterfeit is identified, according to the light of cholesteryl liquid crystal
Shape energy is learned, a kind of anti-fake material is developed, the anti-fake material can either realize optically variable effect under visible ray, also can be in polarizer
Lower observation show naked eyes invisible pattern, realize double anti-forge effect, effectively raise the antifalse effect of light change technology, greatly
Add imitation difficulty greatly.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of color-changing anti-counterfeit mark, include be partially covered with cholesteric crystal layer, the cholesteric crystal layer it is colourless,
The transparent layer of the nematic liquid crystal with half wavelength phase difference, can be achieved to differentiate the cholesteric phase liquid by the observation of rotatory polarization piece
The part of the nematic liquid crystal layer is covered and is not covered with crystal layer.
Further, the color-changing anti-counterfeit mark also includes base material, and the cholesteric crystal layer is attached to the base material
On；The base material is transparent plastic film.
Further, dark figure layer, the dark figure layer attachment are additionally provided between the base material and cholesteric crystal layer
On the substrate.
Further, the dark figure layer is black layer.
The method for making above-mentioned false proof discoloration mark, comprises the following steps：
S1 black layers in printing on substrates, coating or printing；
S2 covers the liquid crystal material of cholesteric phase formation cholesteric crystal layer on the base material with black layer；
S3 stands the base material for being attached with cholesteric crystal layer, is dried after cholesteric crystal layer is smooth；
S4 cross-linking radiations：The cholesteric liquid crystal of drying is placed on cross-linking radiation under uviol lamp；Lead to nitrogen in cross-linking process；
Nematic liquid crystal solvent portions are covered in the cholesteric crystal layer after step S4 processing and are orientated by S5,
Then ultraviolet radiation-curable is used.
It should be noted that in step S2 and S3, coating and drying site requirements are struck sparks without electricity, no strong oxidizer, and are protected
Hold well-ventilated.
It should be noted that in step S4, the condition of cross-linking radiation is that ultraviolet wavelength range is 200-400nm, ultraviolet
Light intensity is 10-20mW/cm2, temperature range is 50-80 DEG C.
It should be noted that in step S5, the nematic liquid crystal solution by liquid crystal molecule and butanone by being made into concentration
30% solution, is formulated after adding ultraviolet initiator.
It should be noted that after the completion of step S5, with ethyl acetate and ether with volume ratio 1:The mixed solution of 1 mixing enters
Row is rinsed.
The beneficial effects of the present invention are：The color-changing anti-counterfeit mark of the present invention can either realize optically variable effect under visible ray,
Also naked eyes invisible pattern can be shown in the lower observation of rotatory polarization piece, realizes double anti-forge effect, effectively raise light change
The antifalse effect of technology, considerably increases imitation difficulty.
Brief description of the drawings
Fig. 1 is the schematic cross-section of the embodiment of the present invention；
Visually descended and the effect diagram under rotatory polarization piece in Fig. 2-3 respectively embodiments 1；
Visually descended and the effect diagram under rotatory polarization piece in Fig. 4-5 respectively embodiments 2；
Visually descended and the effect diagram under rotatory polarization piece in Fig. 6-7 respectively embodiments 3.
Embodiment
Below with reference to accompanying drawing, the invention will be further described, it is necessary to which explanation, the present embodiment is with this technology side
Premised on case, detailed embodiment and specific operating process are given, but protection scope of the present invention is not limited to this reality
Apply example.
As shown in figure 1, a kind of color-changing anti-counterfeit mark, includes cholesteric crystal layer 3, the top of cholesteric crystal layer 3
Divide covered with colourless, the transparent layer of the nematic liquid crystal with half wavelength phase difference 4, pass through the observation of rotatory polarization piece and difference can be achieved
Open the part for covering and being not covered with the nematic liquid crystal layer 4 in the cholesteric crystal layer 3.
Further, the color-changing anti-counterfeit mark also includes base material 1, and the cholesteric crystal layer 3 is attached to the base
On material 1；The base material 1 is transparent plastic film.
Further, dark figure layer 2, the dark figure layer 2 are additionally provided between the base material 1 and cholesteric crystal layer 3
It is attached on the base material 1.
Further, the dark figure layer 2 is black layer.
The method for making above-mentioned false proof discoloration mark, comprises the following steps：
S1 black layers in printing on substrates, coating or printing；
S2 covers the liquid crystal material of cholesteric phase formation cholesteric crystal layer on the base material with black layer.In this reality
Apply in example, the liquid crystal material of cholesteric phase is mainly mixed by the following two kinds liquid crystal material：
Wherein, m, n are 2-11.
S3 stands the base material for being attached with cholesteric crystal layer, is dried after cholesteric crystal layer is smooth.
In step S2 and S3, coating and drying site requirements are struck sparks without electricity, no strong oxidizer, and keep well-ventilated.
S4 cross-linking radiations：The cholesteric liquid crystal of drying is placed on cross-linking radiation under uviol lamp；Lead to nitrogen in cross-linking process；
The condition of cross-linking radiation is that ultraviolet wavelength range is 200-400nm, and ultraviolet light intensity is 10-20mW/cm2, temperature range is 50-
80℃。
Nematic liquid crystal solvent portions are covered in the cholesteric crystal layer after step S4 processing and are orientated by S5,
Then ultraviolet radiation-curable is used.Finally with ethyl acetate and ether with volume ratio 1:The mixed solution of 1 mixing is rinsed.
The nematic liquid crystal solution adds ultraviolet trigger by the way that liquid crystal molecule and butanone to be made into the solution of concentration 30%
It is formulated after agent.In the present embodiment, using following liquid crystal molecule：
M, n are 2-11.
Embodiment 1
1) preparation of liquid crystal material of cholesteric phase
The following two kinds Liquid Crystalline Polymeric Materials are used with volume ratio 1:1 (actual available proportion is 2：1-1：1)
It is mixed to get mixture.Then with volume ratio mixture：Initiator Irgacure184：Butanone solution=10：5：200 mixed liquors
Obtain liquid crystal material of cholesteric phase.
2) scratch
First adhere to black layer on base film.Base film uses PET film material, and thickness is 50-100 μm, this
Embodiment uses 50 μm of film.
Liquid crystal material of cholesteric phase is coated on base film by the way of blade coating and forms cholesteric crystal layer, coating speed
1-10m/min is spent, the present embodiment uses 5m/min.The thickness for the cholesteric crystal layer being coated with is 5-15 μm, and the present embodiment is adopted
With 12 μm, dry film is about 8 μm.
3) dry
Coating is finished, and the base material for scribbling cholesteric crystal layer is stood into 15 seconds, baking is transferred to after cholesteric crystal layer is smooth
Case (or being placed in thermal station) dries 1min, and temperature range is 50-80 DEG C, and temperature is 65 DEG C in the present embodiment；Coating and drying field
It is required to be struck sparks without electricity, no strong oxidizer, and keep well-ventilated.
4) cross-linking radiation
The cholesteric liquid crystal of drying is placed on cross-linking radiation under uviol lamp, ultraviolet wavelength range is 200-400nm, it is purple
Outer light intensity is 10-20mW/cm2, the present embodiment is using 365nm wavelength, light intensity 15mW/cm2；Temperature range is 50-80 DEG C, this reality
It is 65 DEG C to apply temperature in example；Lead to nitrogen in cross-linking process.
5) liquid crystal molecule and butanone are made into 30% solution, nematic liquid crystal solution is obtained after adding ultraviolet initiator；
Liquid crystal molecule is used in the present embodiment：
Using nematic liquid crystal solution cholesteric crystal layer printing on nematic phase character A, through ultraviolet light solidify afterwards.
Now produce color-changing anti-counterfeit mark.
With the naked eye visual effect in the natural light backspin product of changing the line of production as shown in Fig. 2 occur red-green color changeable effect.In circle
Observation under polaroid is it can be seen that character A shade is as shown in Figure 3.
7) gluing
Cut into after appropriate size, in the anti-counterfeiting code band back side or front coating EVA hot-melt adhesive, anti-fake label is made, i.e.,
Can easily it be applied on card body.
Embodiment 2
1) prepared by liquid crystal solution
The following two kinds Liquid Crystalline Polymeric Materials are used with volume ratio 1:1 (actual available proportion is 2：1-1：1)
It is mixed to get mixture.Then with volume ratio mixture：Initiator Irgacure184：Butanone solution=10：5：200 mixed liquors
Obtain liquid crystal material of cholesteric phase.
2) scratch
Base film uses PET film material, and thickness is 50-100 μm, and the present embodiment uses 50 μm of film；Using scraping
Liquid crystal material of cholesteric phase is coated on base film by the mode of painting obtains cholesteric crystal layer, coating speed 1-10m/min, this
Embodiment uses 5m/min；The thickness for being coated with rear cholesteric crystal layer is 5-15 μm, and the present embodiment uses 12 μm, and dry film is about
8μm。
3) dry
Coating is finished, and the base material for scribbling cholesteric crystal layer is stood into 15 seconds, baking is transferred to after cholesteric crystal layer is smooth
Case (or being placed in thermal station) dries 1min, and temperature range is 50-80 DEG C, and temperature is 65 DEG C in the present embodiment；Coating and drying field
It is required to be struck sparks without electricity, no strong oxidizer, and keep well-ventilated.
4) pattern makes
The film in certain pattern and shape is made, as shown in Figure 4.
5) cross-linking radiation
By step 4) make obtained film and block to be radiated with uviol lamp again in cholesteric crystal layer after the drying and hand over
Connection, so as to produce the pattern of film shape.Uviol lamp uses vertical angle, and ultraviolet only passes through in pattern, remainder
All blocked by film.Ultraviolet wavelength range is 200-400nm, and ultraviolet light intensity is 10-20mW/cm2, the present embodiment use
365nm wavelength, light intensity 15mW/cm2；Temperature range is 50 DEG C -80 DEG C, and temperature is 65 DEG C in the present embodiment；Lead in cross-linking process
Nitrogen.
6) liquid crystal molecule and butanone are made into 30% solution, nematic liquid crystal solution is obtained after adding ultraviolet initiator；
Following liquid crystal molecule is used in the present embodiment：
With the upper nematic phase character A of nematic liquid crystal solution printing in cholesteric crystal layer after hardening, through ultraviolet lighting
Penetrate solidify afterwards.
7) rinse
Use ethyl acetate and proportions of ether 1：1 mixed solution rinses the pattern that crosslinking is completed, and is obtained in PET film
Security pattern.
The with the naked eye visual effect cholesteric liquid crystal layer pattern that (i.e. step 5) middle making is obtained as shown in Figure 4), certainly
Red-green color changeable effect occurs in the right light backspin product of changing the line of production.The observation under rotatory polarization piece is it can be seen that character A shade such as Fig. 5 institutes
Show.
8) gluing
Cut into after appropriate size, in the security pattern back side or front coating EVA hot-melt adhesive, anti-fake label is made, i.e.,
Can easily it be applied on card body.
Embodiment 3
1) prepared by liquid crystal solution
The following two kinds Liquid Crystalline Polymeric Materials are used with volume ratio 1:1 (actual available proportion is 2：1-1：1)
It is mixed to get mixture.Then with volume ratio mixture：Initiator Irgacure184：Butanone solution=10：5：200 mixed liquors
Obtain liquid crystal material of cholesteric phase.
2) scratch
Base film uses PET film material, and thickness is 50-100 μm, and the present embodiment uses 50 μm of film；It is thin in PET
One layer 4-10 μm of polydimethylsiloxane is coated with film, the present embodiment coating thickness is 5 μm；Liquid crystal material of cholesteric phase is using blade coating
Mode be coated in the PET film with polydimethylsiloxane and obtain cholesteric crystal layer, coating speed 1-10m/min, this
Embodiment uses 5m/min；The thickness for being coated with liquid crystal material of cholesteric phase is 5-15 μm, and the present embodiment uses 12 μm, after drying about
For 8 μm.
3) dry
Coating is finished, and the base material for scribbling cholesteric crystal layer is stood into 15 seconds, baking is transferred to after cholesteric crystal layer is smooth
Case (or being placed in thermal station) dries 1min, and temperature range is 50-80 DEG C, and temperature is 65 DEG C in the present embodiment；Coating and drying field
It is required to be struck sparks without electricity, no strong oxidizer, and keep well-ventilated.
4) cross-linking radiation
The cholesteric liquid crystal of drying is placed on cross-linking radiation under uviol lamp, ultraviolet wavelength range is 200-400nm, it is purple
Outer light intensity is 10-20mW/cm2, the present embodiment is using 365nm wavelength, light intensity 15mW/cm2；Temperature range is 50-80 DEG C, this reality
It is 65 DEG C to apply temperature in example；Lead to nitrogen in cross-linking process.Wherein it is possible to which the base film covered with cholesteric crystal layer makes change
Color shape of rectangular ribbon, as shown in Figure 6.
5) liquid crystal molecule and butanone are made into 30% solution, add ultraviolet initiator and obtain nematic liquid crystal solution.This
Following liquid crystal molecule is used in embodiment：
Nematic phase character FRI is printed with nematic liquid crystal solution in cholesteric crystal layer after hardening, through ultraviolet lighting
Penetrate solidify afterwards.
7) rinse
Use ethyl acetate and proportions of ether 1：1 mixed solution rinses the pattern that crosslinking is completed, and is obtained in PET film
Security pattern.
With the naked eye visual effect in the natural light backspin product of changing the line of production as shown in fig. 6, occur red-green color changeable effect.In circle
Observation under polaroid is it can be seen that character A shade is as shown in Figure 7.
8) transfer
Security pattern is transferred on PETG films using UV transfer glues, PETG material security patterns can be laminated by being made.
9) it is laminated accreditation
PETG security patterns can obtain convenient answer on the card body of PETG materials after being accused of with the lamination of PETG card bodies material
With.
For those skilled in the art, technical scheme that can be more than and design, make various corresponding
Change and deform, and all these change and deformation should be construed as being included within the protection domain of the claims in the present invention.
Claims (9)
1. a kind of color-changing anti-counterfeit mark, it is characterised in that include and partly covered in cholesteric crystal layer, the cholesteric crystal layer
Colourless, the transparent layer of the nematic liquid crystal with half wavelength phase difference is stamped, can be achieved to differentiate institute by the observation of rotatory polarization piece
State the part that the nematic liquid crystal layer is covered and be not covered with cholesteric crystal layer.
2. color-changing anti-counterfeit mark according to claim 1, it is characterised in that also include base material, the cholesteric liquid crystal
Layer attachment is on the substrate；The base material is transparent plastic film.
3. color-changing anti-counterfeit mark according to claim 2, it is characterised in that between the base material and cholesteric crystal layer also
Provided with dark figure layer, the dark figure layer attachment is on the substrate.
4. color-changing anti-counterfeit mark according to claim 3, it is characterised in that the dark figure layer is black layer.
5. a kind of method of the false proof discoloration mark made described in claim 1, it is characterised in that comprise the following steps：
S1 black layers in printing on substrates, coating or printing；
S2 covers the liquid crystal material of cholesteric phase formation cholesteric crystal layer on the base material with black layer；
S3 stands the base material for being attached with cholesteric crystal layer, is dried after cholesteric crystal layer is smooth；
S4 cross-linking radiations：The cholesteric liquid crystal of drying is placed on cross-linking radiation under uviol lamp；Lead to nitrogen in cross-linking process；
Nematic liquid crystal solvent portions are covered in the cholesteric crystal layer after step S4 processing and are orientated by S5, then
Use ultraviolet radiation-curable.
6. method according to claim 5, it is characterised in that in step S2 and S3, coating and drying site requirements are without electricity
Sparking, no strong oxidizer, and keep well-ventilated.
7. method according to claim 5, it is characterised in that in step S5, the nematic liquid crystal solution is by by liquid
Brilliant molecule is made into the solution of concentration 30% with butanone, is formulated after adding ultraviolet initiator.
8. method according to claim 5, it is characterised in that after the completion of step S5, with ethyl acetate and ether with volume
Than 1:The mixed solution of 1 mixing is rinsed.
9. method according to claim 5, it is characterised in that in step S4, the condition of cross-linking radiation is ultraviolet wavelength
Scope is 200-400nm, and ultraviolet light intensity is 10-20mW/cm2, temperature range is 50-80 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710420945.2A CN107038950A (en) | 2017-06-07 | 2017-06-07 | A kind of color-changing anti-counterfeit mark |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710420945.2A CN107038950A (en) | 2017-06-07 | 2017-06-07 | A kind of color-changing anti-counterfeit mark |
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| CN107038950A true CN107038950A (en) | 2017-08-11 |
Family
ID=59541880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710420945.2A Pending CN107038950A (en) | 2017-06-07 | 2017-06-07 | A kind of color-changing anti-counterfeit mark |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109270712A (en) * | 2018-09-19 | 2019-01-25 | 北京化工大学 | A kind of liquid crystal film and its preparation method and application |
| CN113759622A (en) * | 2020-06-04 | 2021-12-07 | 新伟智方有限公司 | Anti-counterfeiting changing device comprising piezochromic fluorescent layer |
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| CN101905588A (en) * | 2009-06-03 | 2010-12-08 | 中国人民银行印制科学技术研究所 | Light variation anti-forgery element with multiple anti-forgery functions |
| CN101908297A (en) * | 2009-06-03 | 2010-12-08 | 中国人民银行印制科学技术研究所 | Optically variable anti-counterfeiting element |
| CN102179966A (en) * | 2011-01-20 | 2011-09-14 | 中国人民银行印制科学技术研究所 | Anti-counterfeiting element and anti-counterfeiting product |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101501537A (en) * | 2006-08-09 | 2009-08-05 | 日本发条株式会社 | Identifying medium, identifying medium manufacturing method, article and identifying medium identifying method |
| DE102009010770A1 (en) * | 2008-02-27 | 2009-09-10 | De La Rue International Ltd. | Improved process for making an optically variable security device |
| CN101905588A (en) * | 2009-06-03 | 2010-12-08 | 中国人民银行印制科学技术研究所 | Light variation anti-forgery element with multiple anti-forgery functions |
| CN101908297A (en) * | 2009-06-03 | 2010-12-08 | 中国人民银行印制科学技术研究所 | Optically variable anti-counterfeiting element |
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| CN113759622A (en) * | 2020-06-04 | 2021-12-07 | 新伟智方有限公司 | Anti-counterfeiting changing device comprising piezochromic fluorescent layer |
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