CN115482716A - Tamper-proof certificate card containing holographic anti-counterfeiting mark and manufacturing method thereof - Google Patents
Tamper-proof certificate card containing holographic anti-counterfeiting mark and manufacturing method thereof Download PDFInfo
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- CN115482716A CN115482716A CN202211359638.5A CN202211359638A CN115482716A CN 115482716 A CN115482716 A CN 115482716A CN 202211359638 A CN202211359638 A CN 202211359638A CN 115482716 A CN115482716 A CN 115482716A
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Images
Classifications
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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
-
- 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
- G09F2003/0208—Indicia
- G09F2003/0213—Concealed data
-
- 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
- G09F2003/0257—Multilayer
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Credit Cards Or The Like (AREA)
- Holo Graphy (AREA)
Abstract
The invention provides a tamper-proof certificate card containing a holographic anti-counterfeiting mark, which comprises a certificate card substrate and an anti-counterfeiting information layer arranged on the certificate card substrate, wherein the anti-counterfeiting information layer sequentially comprises a carrier layer, a holographic structural layer, a coating, a temperature-resistant fixed layer, a laser activation layer and a protective layer from bottom to top, the carrier layer, the holographic structural layer, the coating and the temperature-resistant fixed layer form a holographic anti-counterfeiting material layer, and the certificate card substrate and the holographic anti-counterfeiting material layer are fused into a whole in a heating laminating mode. This but include anti-tampering certificate card of holographic anti-fake label possesses the hologram that can clearly present, has easily discerning, inhale the three-dimensional deep sense of sight, the developments are felt, the color is felt and hide the encryption effect, and the certificate card each layer combines firmly, and the change inconsistent with laser identification information color can appear when falsifying person's intention passes through laser change authenticated laser identification information, forms obvious difference contrast, and is visible, effectively prevents the effect of falsifying person to certificate card identification information.
Description
Technical Field
The invention relates to the technical field of anti-counterfeiting, in particular to a tamper-proof certificate card containing a holographic anti-counterfeiting mark and a manufacturing method thereof.
Background
Anti-counterfeit identification cards are widely used in various fields such as identification use (ID cards), financial transfer (credit cards), social security, etc., and based on these fields of use, identification cards must have security features that make it almost impossible for an unauthorized user to counterfeit or tamper with the cards, preventing loss due to theft. To prevent counterfeiting or tampering, a variety of different security features have been proposed and used, such as security features like watermarks, embossed marks, light-transmissive trademarks, photo logos made by laser etching, holograms, fluorescent marks, etc. An important part of the security feature in the identification card is to store personal or personalized feature information, such as an identification photo, personal data, information of an issuer and the like, which individually corresponds to an individual using the identification card, and therefore, such feature information is often subject to forgery or falsification.
The high-quality anti-counterfeiting card is particularly composed of Polycarbonate (PC) nowadays, personal or personalized information of a polycarbonate-based card is usually formed by laser etching, information with certain saturation and gray contrast is ablated on a specified material layer according to the focusing depth of laser, and etched information is formed by carbonizing or partially ablating etched components in the specified material layer by using light condensation to form fine carbon particles, so that a layer is displayed, and compared with other printing modes, the etched information layer has the advantages that color change and information loss cannot occur along with the time. Nevertheless, in the case of counterfeit or falsified identification cards, it is still possible to tamper the laser identification information by using a specific method, such as adding more personal information on the laser-etched photo layer, adding or modifying a digital number group. Such tampering information is often difficult to distinguish visually, giving the unauthorized user of the card the opportunity to deceive the inspector.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a tamper-proof card containing a holographic anti-counterfeiting mark, which is provided with a clearly-appearing hologram, comprises pictures and texts with the effects of reproducing the pictures and texts/Fresnel lenses by a laser encryption point light source and dynamic gratings, has the advantages of easy identification, stereoscopic sense, dynamic sense, color sense and hidden encryption effect of eye absorption, and is firm in combination of all layers of the card, the tamper is prevented from being uncovered, and when a tamperer intends to change authenticated laser identification information by laser, the color of the laser identification information is inconsistent with that of the laser identification information, so that obvious difference contrast is formed, the tamper can be seen visually, and the effect of tampering the identification information of the card by the tamperer is effectively prevented. The invention also provides a method for manufacturing the anti-counterfeiting certificate card.
In order to realize the technical scheme, the invention provides a tamper-proof certificate card containing a holographic anti-counterfeiting mark and a manufacturing method thereof, wherein the tamper-proof certificate card comprises the following steps: the holographic anti-counterfeiting card comprises a card substrate and an anti-counterfeiting information layer arranged on the card substrate, wherein the anti-counterfeiting information layer sequentially comprises a carrier layer, a holographic structure layer, a coating, a temperature-resistant fixed layer, a laser activation layer and a protective layer from bottom to top, the carrier layer, the holographic structure layer, the coating and the temperature-resistant fixed layer form a holographic anti-counterfeiting material layer, the card substrate and the holographic anti-counterfeiting material layer are fused into a whole in a heating lamination mode, and the carrier layer can be subjected to laser etching to form specific personalized information; the holographic structure layer comprises an image-text and dynamic grating, wherein the image-text and dynamic grating are obtained by reproducing the image-text/Fresnel lens effect by the laser encrypted point light source; the coating is deposited on the holographic structure layer and is used for improving the brightness and the glossiness of the holographic anti-counterfeiting pattern; the temperature-resistant fixing layer is tightly attached to the surface of the cladding, so that a structure corresponding to the structure of the holographic structure layer is formed on the attaching surface of the temperature-resistant fixing layer and the cladding, the structure of the holographic structure layer is rubbed out, and the structure of the holographic structure layer is fixed, thereby ensuring that the temperature-resistant fixing layer cannot deform or only deforms to a minimum degree under the laminating condition; the laser activation layer is printed on the surface of the temperature-resistant fixed layer, has the characteristic of laser irradiation color change, and can generate change with inconsistent color of laser identification information when a falsifier intends to change the authenticated laser identification information through laser, so as to form obvious difference contrast; the protective layer is printed on the surface of the laser activation layer.
Preferably, the holographic structure layer is arranged on the side face opposite to the joint face of the identification card substrate and the carrier layer, and the laser encryption point light source reproduces the image and text of the image and text/Fresnel lens effect and the dynamic grating is pressed and copied on the holographic structure layer in a master mould pressing mode.
Preferably, the laser encrypted point light source reproduced image and text is obtained by modulating light wave front by applying a light information processing technology, recording modulation information on a medium surface in a laser etching mode, showing the modulation information as a micro-nano relief structure, modulating and diffracting light waves into required image and text images when the point light source irradiates, seeing two layers of image and text images with different depths of field when the point light source irradiates, and floating the image and text images when the point light source shakes; the dynamic grating is a grating with the stripe direction continuously changing according to rules, the change angle range of the grating is 0-90 degrees, and the grating stripe period is 0.5-3 mu m.
Preferably, the images and texts with the Fresnel lens effect are obtained by superposing a Fresnel lens structure on the basis of an image-text grating structure, wherein the superposed Fresnel lens structure is composed of a concentric ring band structure, the ring band density gradually becomes dense from the middle to the edge, the width of the middle ring band is 20-150 μm, and the width of the edge ring band is 0.5-5 μm.
Preferably, the identification card base material and the carrier layer in the anti-counterfeiting information layer are made of the same material, and the identification card base material and the carrier layer are fused into an integral structure in a heating lamination mode.
Preferably, the temperature-resistant fixing layer is composed of a resin with a glass transition temperature Tg higher than 200 ℃ and a temperature-resistant additive.
Preferably, the laser activation layer consists of a matrix resin, a color former, a color developer, an additive and a solvent, wherein the matrix resin is one or more of acrylic resin, styrene resin, epoxy compound resin, polyester, polyurethane, polyisocyanate and natural adhesive resin and derivatives thereof; the color former is one or more of a phthalide-based dye, a fluoran-based dye, a triarylmethane-based dye, a benzoxazine-based dye, a spiropyran-based dye, or a mixture thereof; the color developing agent is one or more of activated clay, attapulgite, colloidal silicon dioxide, aluminum silicate, phenolic compounds, sulfuric acid or carboxylic acid derivatives, the additive is one or more of laser etching aids, smoke inhibitors, flatting agents and filling aids, and the solvent is water, organic solvents or the mixture thereof.
Preferably, the visible light transmittance of the protective layer is greater than 90%.
The invention also provides a manufacturing method of the tamper-proof certificate card containing the holographic anti-counterfeiting mark, which specifically comprises the following steps:
s1, manufacturing holographic anti-counterfeiting material
S11, manufacturing a carrier layer, selecting a polycarbonate laser etching film as a carrier layer base material, and etching image-text information with gray scale change on the surface of the film through laser radiation;
s12, manufacturing a holographic structure layer, namely using methacrylic resin added with a high-temperature-resistant material as holographic structure layer main body resin, imprinting the holographic structure on the holographic structure layer in a master mould pressing mode, and then coating the holographic structure layer on the surface of the carrier layer in a coating mode;
s13, uniformly and tightly covering the ZnS coating on the surface of the holographic structure layer in a vacuum coating mode;
s14, coating a thermosetting acrylic coating which contains a nano-scale fumed silica filler and has a glass transition temperature Tg higher than 200 ℃ on the ZnS coating in a reticulate pattern roller coating mode, and rubbing and fixing the holographic structure;
s2, laminating certificate card substrate and holographic anti-counterfeiting material
The identification card substrate uses polycarbonate which is the same as the carrier layer as the substrate, and is laminated with the holographic anti-counterfeiting material obtained in the step S1 for 20-30min under the conditions of 1-5MPa and 180-190 ℃, wherein the carrier layer is in contact with the identification card substrate and is melted to form a whole, and the identification card with the holographic anti-counterfeiting mark is obtained;
s3, laser etching personalized information
Personalized information is etched on the holographic anti-counterfeiting material surface of the identification card in a laser etching mode, the laser etching information is verified, when a falsifier intends to change the authenticated laser identification information through laser, the change inconsistent with the color of the laser identification information occurs, and obvious difference comparison is formed;
s4, printing a laser activation layer
Printing a laser activation layer on the temperature-resistant fixed layer, wherein the printing covering surface can cover the whole surface or only cover in the laser identification area according to the use scene;
s5, printing protective layer
And (3) selecting proper transparent protective gloss oil to print a protective layer on the surface of the laser activation layer, and covering the whole surface of the card.
Preferably, in the step S3, the authenticated black-and-white laser identifier with gray scale change is obtained by IR laser irradiation, when a falsifier intends to change the laser identifier by laser etching, the color of the falsification identifier appearing on the laser activation layer is blue, and is obviously different from the black-and-white laser identifier, and is visible and unrecoverable, and when a user observes the information of such color difference, it can be determined that the identification card has been falsified.
The invention provides a tamper-proof certificate card containing holographic anti-counterfeiting mark and a manufacturing method thereof, which have the advantages that: the tamper-proof card prepared by the invention solves the problems that the existing tamper-proof card has unobvious anti-counterfeiting characteristics and is easy to be uncovered and tampered by laser etching, has a clearly presented hologram, comprises pictures and texts with the effects of reproducing the pictures and texts/Fresnel lenses by a laser encryption point light source and dynamic gratings, has the advantages of easy identification, eye-sucking three-dimensional deep sense, dynamic sense, color sense and hidden encryption effect, is firmly combined in each layer of the card, prevents uncovering and tampering, and can generate the change inconsistent with the color of laser identification information when a tamperer intends to change the authenticated laser identification information by laser, forms obvious difference contrast and is visible, thereby effectively preventing the tamperer from tampering the identification information of the card.
Drawings
FIG. 1 is a schematic cross-sectional view of an anti-tamper identification card according to the present invention.
Fig. 2 shows the laser encrypted point light source to reproduce the image-text image.
FIG. 3 shows a laser-encrypted point light source to reproduce a micro-nano relief structure.
Fig. 4 is a schematic diagram of an image-text grating structure with a fresnel lens effect.
FIG. 5 is a schematic diagram of verified information from laser etching.
FIG. 6 is a schematic diagram of the change of different colors on the surface caused by the fact that a tamperer laser etches and modifies the card information.
FIG. 7 is a flow chart illustrating steps of a manufacturing method of the present invention.
The labels in the figure are respectively: 10-certificate card substrate; 11-a carrier layer; 12-a holographic structural layer; 13-temperature resistant fixed layer; 14-a laser active layer; 15-a protective layer; 16-a holographic security material layer; 101-laser marking; 102-tamper identification; 110-a holographic structure; 1101-laser encrypting the image-text image reproduced by the point light source; 1102-laser encryption of a point light source to reproduce a micro-nano relief structure of the image and text; 1101' -a teletext grating structure; 1102' -stacked fresnel lens structures.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person skilled in the art without making any inventive step are within the scope of protection of the present invention.
Example 1: tamper-proof certificate card containing holographic anti-counterfeiting mark
Referring to fig. 1 to 6, a tamper-proof identification card including a holographic anti-counterfeit mark includes: card substrate 10 and the anti-fake information layer of setting on the card substrate of certificate, this anti-fake information layer includes carrier layer 11, holographic structural layer 12, cladding material, temperature resistant fixed layer 13, laser active layer 14 and protective layer 15 from supreme down in proper order, and wherein carrier layer 11, holographic structural layer 12, cladding material, temperature resistant fixed layer 13 have constituteed holographic anti-fake material layer 16.
The identification card substrate 10 may be any card body material commonly used in the field of identification cards in principle, and may be selected from Polycarbonate (PC), polyethylene terephthalate (PET), polyvinyl chloride (PVC), polypropylene (PE), polyurethane (TPU), and copolymers of these polymers. The identification card substrate 10 of the present invention should have a thickness to be self-supporting, yet have flexural toughness, good dimensional stability, and be suitable for lamination with a security information layer, and the identification card substrate 10 is preferably a Polycarbonate (PC) material having a thickness of 30-500 μm.
The carrier layer 11 is used as a support of the anti-counterfeiting information layer and is combined with the identification card base material 10 in a heating laminating mode so as to fuse the combination surface of the identification card base material 10 and the anti-counterfeiting information layer into a whole, the carrier layer 11 is preferably made of the same material as the identification card base material 10, polycarbonate (PC) or a copolymer thereof is selected, and the thickness of the carrier layer 11 is 20-100 mu m.
The carrier layer 11 can be etched by means of a laser to form specific individualizing information. In order to promote and support the carrier layer to display the resolution, color reducibility and whiteness effects of the pictures and texts through laser etching, a proper laser etching auxiliary agent can be added. Suitable laser etching aids include metal oxides, carbon black and mica coated with metal oxides, metal sulfides and metal chlorides, and the like.
In this embodiment, the carrier layer 11 is a Polycarbonate (PC) film containing metal oxide laser etching aids, and the use of these aids is beneficial to etching gray scale-changing graphic and text information on the surface of the light-colored Polycarbonate (PC) film by laser.
The holographic structure layer 12 is arranged on the side surface opposite to the joint surface of the identification card substrate 10 and the carrier layer 11, and the holographic structure is embossed and copied on the holographic structure layer 12 in a master mould pressing mode, so that a holographic pattern with a certain visual anti-counterfeiting effect is formed.
The hologram structure may be formed by uv curing, thermal curing, electron beam curing, etc., and the hologram structure layer 12 may be formed using a resin suitable for hologram molding, such as epoxy resin, acrylic resin, cellulose ester, urethane resin, etc. Considering that the identification card substrate 10 and the holographic anti-counterfeiting material layer 16 are laminated to form an integral body under the conditions of high temperature and high pressure (1-5 MPa, 180-190 ℃), the integrity of the micro-nano structure in the holographic structure layer 12 after lamination needs to be ensured, high temperature resistant materials such as nano inorganic filler, amino resin, fluorosilicone resin, polycarbonate resin, styrene-maleic anhydride copolymer and the like can be added into the holographic structure layer 12 to improve the high temperature and high pressure resistance of the holographic structure layer 12.
In this embodiment, the holographic structure layer 12 is added with a copolymer containing polyester chain units and polycarbonate chain units, under the condition of lamination temperature and pressure, the PC film of the carrier layer 11 is fused and combined with the side, connected with the PC card substrate 10, of the side, connected with the holographic structure layer 12, due to similar groups, covalent coupling occurs between the two layers, so that the two layers are tightly combined, and the uncovering, tampering and replacement of a tamperer are effectively prevented.
Referring to fig. 2 and 3, the holographic structure in the holographic structure layer 12 may include a laser encrypted point light source reconstruction image and text and a dynamic grating. The laser encryption point light source is used for reproducing the image and text, namely two layers of image and text images with different depths of field can be seen when the point light source is used for irradiating, and the image and text images float along with the point light source when the point light source is shaken; the method is characterized in that an optical information processing technology is applied, the wave front of light waves is modulated, modulated information is recorded on a medium surface in a laser etching mode and is expressed as a micro-nano relief structure, and when a point light source is used for irradiation, the light waves are modulated and diffracted into required image-text images. The dynamic grating is a grating with the stripe direction continuously changing according to rules, the change angle range of the grating is 0-90 degrees, and the grating stripe period is 0.5-3 mu m.
Referring to fig. 4, the holographic structure in the holographic structure layer 12 may include a fresnel lens effect image and text and a dynamic grating. The fresnel lens effect is produced by superimposing a fresnel lens structure 1102 'on top of a lenticular structure 1101'. The teletext grating structure 1101' is an equidistant grating having a grating period of 0.5-20 μm. The stacked Fresnel lens structure 1102' is composed of concentric ring band structures, the ring band density gradually becomes dense from the middle to the edge, the width of the middle ring band is 20-150 mu m, and the width of the edge ring band is 0.5-5 mu m. The dynamic grating is a grating with the stripe direction continuously changing according to rules, the change angle range of the grating is 0-90 degrees, and the grating stripe period is 0.5-3 mu m.
The holographic structure is stamped on the holographic structure layer 12 in a master mould pressing mode, and has the advantages of easy identification, stereoscopic sense of depth, dynamic sense, color sense and hidden encryption effect.
The coating layer can be deposited on the holographic structure layer 12 by vacuum evaporation or sputtering, and can be made of TiO 2 、Si 2 O 3 High refractive index materials such as SiO, znS, cr, sn and Al, preferably materials having a refractive index of more than 2.0, and preferably in a thickness range
It should be noted that when the optically opaque coating such as Al, cr, etc. is selected, appropriate area hollowing should be performed in the laser-etched image-text area to avoid visual obstruction to the laser-etched image-text.
The temperature-resistant fixing layer 13 is disposed on the plating layer, and the temperature-resistant fixing layer 13 needs to have a high glass transition temperature, higher than the temperature to be endured during lamination, and be stable and pressure-resistant. The temperature-resistant fixed layer 13 is tightly attached to the plating layer, so that a structure which is just corresponding to the micro-nano structure of the holographic structure layer 12 is formed on the attaching surface of the temperature-resistant fixed layer and the plating layer, the micro-nano structure of the holographic structure layer 12 is rubbed, the micro-nano structure is fixed, and deformation can not occur or only occurs in a very small degree under the laminating condition.
The heat-resistant fixing layer 13 may be formed of a thermosetting resin or a thermoplastic resin having a glass transition temperature Tg higher than 200 ℃, such as polytetrafluoroethylene, cellulose acetate, polyacrylamide, a styrene-maleic anhydride copolymer, or a crosslinked resin of a polyhydroxyacrylic resin and isocyanate. At the same time, the use of the addition of suitable inorganic fillers such as nano-silica, titanium dioxide, tin dioxide, and tin antimony oxide has also proven reliable. The coating is carried out by any suitable means, the thickness of the coating preferably being 0.2 to 1 μm. It should be noted that the refractive index of the temperature-resistant fixing layer 13 should be greatly different from that of the plating layer to avoid the extinction effect caused by the similar refractive index to reduce the brightness of the holographic structure pattern, and therefore the refractive index difference between the temperature-resistant fixing layer 13 and the plating layer should be greater than 0.30, preferably greater than 0.50.
The laser activation layer 14 is arranged on the temperature-resistant fixed layer 13 after laser etching personalized information on the carrier layer 11. The laser activated layer 14 is preferably transparent in the visible range, i.e., has a transmittance of at least greater than 80% in the visible wavelength range of human eyes, to avoid visual obstruction of the laser-etched information and holographic security pattern that is covered under it. Meanwhile, when a tamperer intends to change the authenticated laser identification information on the carrier layer 11 by laser, the laser activation layer 14 changes in color which is inconsistent with the laser identification information, for example, the laser information on the carrier layer 11 is a black-and-white gray scale change pattern, and when the tamperer tries to tamper by using laser again, the laser activation layer 14 shows blue/green change to remind the user that the laser identification is tampered.
The laser active layer 14 may have the following composition: matrix resin, color former, color developer, additive and solvent. The color formers, developers, additives may be applied to the matrix resin substrate using various coating or printing methods. The coating thickness is in the range of 0.1-50 μm, preferably in the range of 1-20 μm. The leuco dye which is wrapped in the core-shell structure polymer and is colorless is preferably used as a color former, the core-shell structure polymer is melted under the irradiation of laser so that the color former and a color developing agent are activated to perform chemical reaction, and the leuco dye presents the color within the visible light wavelength range.
The matrix resin acts as a support material for the laser active layer while providing adhesion between the upper and lower layers. The matrix resin used herein includes acrylic resins, styrene resins, epoxy resins, polyesters, polyurethanes, polyisocyanates, and natural binder resins and derivatives thereof, and the like. In this example, the matrix resin is a polyester-urethane copolymer-based binder.
The color-former may be selected depending on the color upon laser activation, with alternative color-formers such as phthalide-based dyes, fluoran-based dyes, triarylmethane-based dyes, benzoxazine-based dyes, and spiropyran-based dyes, or mixtures thereof. Preferably, the color former is a phthalide-based dye, and based on its reacted hue, the following compounds based on the phthalide structure are exemplified:
wherein, the color former is wrapped in the core-shell structure polymer and separated from the color developing agent. Further, the core-shell structure polymer is a styrene-acrylic acid copolymer, a styrene-ethylhexyl acrylate copolymer, a styrene-butadiene copolymer or a vinyl acetate-crotonic acid copolymer. The color former is encapsulated by the core-shell emulsion polymerization reaction to form color former polymer particles.
The color developer may be an organic or inorganic color developing material, an inorganic color developer such as activated clay, attapulgite, colloidal silica, aluminum silicate, or the like; examples of the organic color developer include phenolic compounds, sulfuric acid, and carboxylic acid derivatives. Preferred in this example are ester derivatives of sulfuric acid, such as cyclohexyl p-toluenesulfonate, 2-methylcyclohexyl p-toluenesulfonate, 1, 4-cyclohexanediol di-p-toluenesulfonate and ethyl 4-toluenesulfonylcyclohexanecarboxylate.
The additives may comprise other components suitable for improving the properties of the composition, such as laser etching aids, smoke suppressants, leveling agents, and filling aids, among others. The laser etching auxiliary agent enables the laser activation layer to be more sensitive to laser radiation, and is beneficial to forming color change under low laser radiation. Suitable laser etching aids can include metal oxides, carbon black and mica coated with metal oxides, metal sulfides and metal chlorides, and the like. It is to be noted that the laser-etching aid does not impart an unnecessary background coloration to the laser-active layer, which can be achieved by using only a small amount of laser-etching aid or by selecting a laser-etching aid that has a small absorption in the visible wavelength range.
The solvent may be water, an organic solvent or a mixture thereof. For dissolving the matrix resin, developer and additives without destroying the color former polymer particles. Alternative solvents include alkyl esters, alkanols, polyols, ketones, ethers, alkylnaphthalenes, polycyclic aromatics, and the like.
The protective layer 15 is used as the surface layer of the card, the visible light transmittance is more than 90%, the clear visibility of the internal laser identification and holographic information is ensured, and the card has high peeling strength, flexibility, scratch resistance, weather resistance, chemical resistance and the like. The surface coating layer commonly used in the art may be used according to the usage scenario, and is not particularly limited herein.
The tamper-proof card prepared by the invention solves the problems that the existing tamper-proof card has unobvious anti-counterfeiting characteristics and is easy to be uncovered and tampered by laser etching, has a clearly presented hologram, comprises pictures and texts with the effects of reproducing the pictures and texts/Fresnel lenses by a laser encryption point light source and dynamic gratings, has the advantages of easy identification, eye-sucking three-dimensional deep sense, dynamic sense, color sense and hidden encryption effect, is firmly combined in each layer of the card, prevents uncovering and tampering, and can generate changes inconsistent with the colors of laser identification information when a tamperer intends to change authenticated laser identification information by laser, thereby forming obvious difference contrast, being visible and effectively preventing the tamperer from tampering the identification information of the card.
Example 2: preparation method of tamper-proof certificate card containing holographic anti-counterfeiting mark
Referring to fig. 7, a method for preparing a tamper-proof identification card with a holographic anti-counterfeiting mark specifically comprises the following steps:
s1, manufacturing holographic anti-counterfeiting material
The part of the anti-counterfeiting information layer consisting of the carrier layer 11, the holographic structure layer 12, the plating layer and the temperature-resistant fixing layer 13 is a holographic anti-counterfeiting material 16 which is used for being laminated with the certificate card base material 10 to form a whole.
The carrier layer 11 adopts polycarbonate laser etching film base material with the thickness of 100 mu m, wherein the blended metal oxide laser etching auxiliary agent accounts for 1-3 per mill of the weight proportion, and the film can etch graph and text information with gray scale change on the surface through laser radiation;
the holographic structure layer 12 is arranged on the carrier layer 11 by coating, wherein the holographic structure layer 12 at least comprises a main resin and a high-temperature resistant material, the main resin is methacrylic resin, and the high-temperature resistant material is a copolymer containing polyester chain links and polycarbonate chain links, and the mass ratio of the two is 6. In addition, the holographic structure layer 12 has a holographic structure, and the holographic structure comprises a micro-nano relief structure and dynamic gratings, wherein the micro-nano relief structure is formed by a laser encrypted point light source to reproduce pictures and texts; as shown in fig. 3, the laser encrypted point light source reproduction text micro-nano structure 1102 is a microscopic representation of the laser encrypted point light source reproduction text 1101, and is represented as a honeycomb micro-nano relief structure; the structure is generated by modulating the wave front of an optical wave and recording the modulated information on the medium surface in a laser etching mode by applying an optical information processing technology. When a point light source is used for irradiating the micro-nano relief structure 1102, light waves are modulated and diffracted into required image-text images 1101, two layers of image-text images with different depths of field can be seen, and when the point light source is shaken, the image-text images float along with the point light source; the stripe direction of the dynamic grating is continuously changed according to a certain rule, the change angle range is 0-90 degrees, and the grating stripe period is 0.5-3 mu m. The holographic structure is stamped on the holographic structure layer 12 in a master mould pressing mode, and has the advantages of easy identification, stereoscopic sense of depth, dynamic sense, color sense and hidden encryption effect.
Referring to fig. 4, the holographic structure may also be an image-text and a dynamic grating including a fresnel lens effect; the images and texts of the Fresnel lens effect are obtained by superposing a Fresnel lens structure 1102 'on the basis of an image-text grating structure 1101', wherein the image-text grating structure 1101 'is an equidistant grating with the period of 1 mu m, the superposed Fresnel lens structure 1102' is composed of concentric ring band structures, the ring band density gradually becomes dense from the middle to the edge, the width of the middle ring band is 80 mu m, and the width of the edge ring band is 2 mu m; the stripe direction of the dynamic grating is continuously changed according to a certain rule, the change angle range is 0-90 degrees, and the grating stripe period is 0.5-3 mu m; the holographic structure is stamped on the holographic structure layer 12 in a master mould pressing mode; has the advantages of easy identification, stereoscopic impression, dynamic feeling and color feeling of sucking eyes.
The holographic structure layer 12 is vacuum-coated to a thickness of
ZnS having a refractive index of 2.35. The ZnS coating uniformly and tightly covers all surfaces of the holographic structure 110, so that no special reference is made in the schematic diagram, but a coating with a high refractive index is required, and compared with a polymer type holographic structure with a lower refractive index, the coating uniformly attached to the holographic structure layer 12 reflects the holographic structure 110 therein, so as to improve the brightness and glossiness of the holographic anti-counterfeiting pattern, and enable the holographic pattern to present a better visual effect.
The temperature-resistant fixed layer 13 is made of a thermocuring acrylic coating with Tg higher than 200 ℃ and contains nano-scale fumed silica filler, the coating is stable and has little or no deformation even under the laminated high-temperature and high-pressure conditions, the coating is arranged on the coating in a reticulate roll coating mode, the thickness is 0.5-0.8 mu m, and the holographic structure 110 is subjected to rubbing and fixing.
S2, laminating the card substrate and holographic anti-counterfeiting material
The identification card substrate 10 is a Polycarbonate (PC) substrate, the thickness is 300 mu m, the identification card substrate and the holographic anti-counterfeiting material 16 are laminated for 20-30min under the conditions of 1-5MPa and 180-190 ℃, one side of the carrier layer 11 is in contact with the identification card substrate 10 and is melted to form a whole, and the identification card with the holographic anti-counterfeiting mark is obtained.
S3, laser etching personalized information
Referring to fig. 5, personalized information is etched on the surface of the holographic anti-counterfeiting material of the identification card in a laser etching manner, the laser etching information is verified and needs to be prevented from being tampered, and the personalized information can include user portraits, text information, digital numbers and the like. A suitable laser source may be CO 2 Laser, nd solid laser and IR laser with wavelength range of 308-1064nm. The specific power and line speed parameters may be determined by the application scenario and may be selected to be sufficient to generate the desired image information. In this embodimentThe color of the black-and-white laser mark 101 obtained by the IR laser irradiation is in contrast to the color of the tamper mark 102 presented by the laser activation layer 14 when the anti-counterfeiting card of the present invention is tampered.
S4, printing a laser activation layer
The laser activation layer 14 is printed on the temperature-resistant fixed layer 13, and the printing covering surface can be covered on the whole surface or only in the laser mark 101 area according to the use scene, so that the laser etching tampered image and text information area is protected for a person who is easy to tamper. Areas subject to tampering such as laser encoded letters, numbers, character images, and distributor logos, etc.
In the present embodiment, the laser active layer 14 mainly includes: the coating comprises a matrix resin polyester-urethane copolymer, polymer particles containing blue color tone couplers, a color-developing agent cyclohexyl p-toluenesulfonate, a laser etching aid and a smoke inhibitor. The coating thickness was 10 μm.
S5, printing protective layer
And selecting proper transparent protective gloss oil to print a protective layer 15 on the surface of the laser activation layer 14, and covering the whole surface of the card. The protective layer protects the card, provides performances such as surface weather resistance, solvent resistance and scratch resistance, and effectively avoids the damage to the card in daily use.
Referring to fig. 6, in this embodiment, an authenticated black-and-white laser identifier 101 with gray scale change is obtained through IR laser irradiation, and after the printing of the laser activation layer 14 and the protection layer 15 is completed, an identification card containing a holographic anti-counterfeiting identifier and user-customized laser etching information is obtained. And all layers containing anti-counterfeiting information are firmly combined and are difficult to be uncovered for tampering. When a tamperer intends to change the laser identifier 101 through laser etching, for example, attempts such as person portrait information addition and character stroke modification result in that the color of the tamper identifier 102 appearing on the laser activation layer 14 is blue, and is obviously different from the black and white laser identifier 101, and is visible and cannot be restored, and when the user observes the information of such color difference, the user can judge that the identification card is tampered.
The above description is only for the preferred embodiment of the present invention, but the present invention should not be limited to the embodiment and the disclosure of the drawings, and therefore, all equivalent or modifications that do not depart from the spirit of the present invention are intended to fall within the scope of the present invention.
Claims (10)
1. A tamper-evident identification card including a holographic security marking, comprising: card substrate and the anti-fake information layer of setting on the card substrate, its characterized in that: the anti-counterfeiting information layer sequentially comprises a carrier layer, a holographic structure layer, a coating, a temperature-resistant fixed layer, a laser activation layer and a protective layer from bottom to top, wherein the carrier layer, the holographic structure layer, the coating and the temperature-resistant fixed layer form a holographic anti-counterfeiting material layer, the certificate card base material and the holographic anti-counterfeiting material layer are fused into a whole in a heating lamination mode, and the carrier layer can be subjected to laser etching to form specific personalized information; the holographic structure layer comprises an image-text and a dynamic grating, wherein the image-text and the dynamic grating are reproduced by the laser encrypted point light source; the coating is deposited on the holographic structure layer and is used for improving the brightness and the glossiness of the holographic anti-counterfeiting pattern; the temperature-resistant fixing layer is tightly attached to the surface of the cladding layer, so that a structure corresponding to the structure of the holographic structure layer is formed on the attaching surface of the temperature-resistant fixing layer and the cladding layer, the structure of the holographic structure layer is rubbed out, and the structure of the holographic structure layer is fixed, so that deformation can not occur or only occurs in a very small degree under the laminating condition; the laser activation layer is printed on the surface of the temperature-resistant fixed layer, has the characteristic of laser irradiation color change, and can generate change with inconsistent color of laser identification information when a tamperer intends to change the authenticated laser identification information through laser to form obvious difference contrast; the protective layer is printed on the surface of the laser activation layer.
2. The tamper-evident identification card including a holographic security marking of claim 1, wherein: the holographic structure layer is arranged on the side face opposite to the joint face of the identification card substrate and the carrier layer, and the laser encryption point light source reproduces the image-text/Fresnel lens effect, and the dynamic grating is pressed and copied on the holographic structure layer in a master mould pressing mode.
3. The tamper-evident certificate card including a holographic security marking as claimed in claim 1 or 2, wherein: the laser encryption point light source reappearing graph and text is to modulate the wave front of light wave by applying a light information processing technology, record the modulation information on a medium surface in a laser etching mode and represent the graph and text as a micro-nano relief structure, when the point light source is used for irradiation, the light wave is modulated and diffracted into required graph and text images, when the point light source is used for irradiation, two layers of graph and text images with different depth of field can be seen, and when the point light source is shaken, the graph and text images float along with the point light source; the dynamic grating is a grating with the stripe direction continuously changing according to a rule, the change angle range of the grating is 0-90 degrees, and the grating stripe period is 0.5-3 mu m.
4. The tamper-evident card including a holographic security marking of claim 1 or 3, wherein: the image and text of the Fresnel lens effect are obtained by superposing a Fresnel lens structure on the basis of an image and text grating structure, the superposed Fresnel lens structure is composed of a concentric ring band structure, the ring band density gradually becomes dense from the middle to the edge, the width of the middle ring band is 20-150 mu m, and the width of the edge ring band is 0.5-5 mu m.
5. The tamper-evident identification card including a holographic security marking of claim 1 or 4, wherein: the base material of the card and the carrier layer in the anti-fake information layer are made of the same material, and the base material of the card and the carrier layer are fused into an integral structure in a heating laminating mode.
6. The tamper-evident card including a holographic security marking of claim 1 or 5, wherein: the temperature-resistant fixed layer is composed of resin with the glass transition temperature Tg higher than 200 ℃ and a temperature-resistant additive.
7. The tamper-evident badge including a holographic security marking of claim 1, wherein: the laser activation layer consists of matrix resin, a color former, a color developing agent, an additive and a solvent, wherein the matrix resin is one or more of acrylic resin, styrene resin, epoxy compound resin, polyester, polyurethane, polyisocyanate, natural adhesive resin and derivatives thereof; the color former is one or more of a phthalide-based dye, a fluoran-based dye, a triarylmethane-based dye, a benzoxazine-based dye, a spiropyran-based dye, or a mixture thereof; the color developing agent is one or more of activated clay, attapulgite, colloidal silicon dioxide, aluminum silicate, phenolic compounds, sulfuric acid or carboxylic acid derivatives, the additive is one or more of laser etching auxiliary agent, smoke-proof agent, flatting agent and filling auxiliary agent, and the solvent is water, organic solvent or mixture thereof.
8. The tamper-evident badge including a holographic security marking of claim 1, wherein: the visible light transmittance of the protective layer is more than 90%.
9. A method for manufacturing a tamper-proof certificate card containing a holographic anti-counterfeiting mark is characterized by comprising the following steps:
s1, manufacturing holographic anti-counterfeiting material
S11, manufacturing a carrier layer, selecting a polycarbonate laser etching film as a carrier layer base material, and etching image-text information with gray scale change on the surface of the film through laser radiation;
s12, manufacturing a holographic structure layer, namely using methacrylic resin added with a high-temperature-resistant material as holographic structure layer main body resin, imprinting the holographic structure on the holographic structure layer in a master mould pressing mode, and then coating the holographic structure layer on the surface of the carrier layer in a coating mode;
s13, uniformly and tightly covering the ZnS coating on the surface of the holographic structure layer in a vacuum coating mode;
s14, coating a thermosetting acrylic coating which contains a nano-scale fumed silica filler and has a glass transition temperature Tg higher than 200 ℃ on the ZnS coating in a reticulate pattern roller coating mode, and rubbing and fixing the holographic structure;
s2, laminated certificate card base material and holographic anti-counterfeiting material
The identification card substrate uses polycarbonate which is the same as the carrier layer as the substrate, and is laminated with the holographic anti-counterfeiting material obtained in the step S1 for 20-30min under the conditions of 1-5MPa and 180-190 ℃, wherein the carrier layer is in contact with the identification card substrate and is melted to form a whole, and the identification card with the holographic anti-counterfeiting mark is obtained;
s3, laser etching personalized information
Personalized information is etched on the holographic anti-counterfeiting material surface of the identification card in a laser etching mode, the laser etching information is verified, when a falsifier intends to change the authenticated laser identification information through laser, the color of the laser identification information is inconsistent with that of the laser identification information, and obvious difference comparison is formed;
s4, printing a laser activation layer
Printing a laser activation layer on the temperature-resistant fixed layer, wherein the printing covering surface can cover the whole surface or only cover the laser identification area according to a use scene;
s5, printing protective layer
And (3) selecting proper transparent protective gloss oil to print a protective layer on the surface of the laser activation layer, and covering the whole surface of the card.
10. The method of claim 9, wherein the method comprises the steps of: in the step S3, the authenticated black-and-white laser identifier with gray scale change is obtained through IR laser irradiation, when a falsifier intends to change the laser identifier through laser etching, the color of the falsification identifier appearing on the laser activation layer is blue, and is obviously different from the black-and-white laser identifier, and is visible and cannot be restored, and when a user observes information of such color difference, it can be determined that the identification card has been falsified.
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Address after: 518132 first floor, building 1 and 3, Juhui Mold Industrial Park, Tianliao Avenue, Tianliao community, Yutang street, Guangming District, Shenzhen, Guangdong Applicant after: Shenzhen Shenda Aurora Technology Co.,Ltd. Address before: 518132 first floor, building 1 and 3, Juhui Mold Industrial Park, Tianliao Avenue, Tianliao community, Yutang street, Guangming District, Shenzhen, Guangdong Applicant before: SHENZHEN SHENDA AURORA TECHNOLOGY Co.,Ltd. |
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Application publication date: 20221216 |