CN109285439B - Image-text anti-counterfeiting structure based on micro-lens array and preparation method thereof - Google Patents
Image-text anti-counterfeiting structure based on micro-lens array and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a graphic anti-counterfeiting structure based on a micro-lens array, which comprises a substrate layer, a micro graphic layer and a back glue layer which are sequentially stacked, wherein the micro graphic layer comprises a structural layer, a metal layer and an ink layer which are sequentially stacked, one side of the structural layer is close to the substrate layer, the other side of the structural layer is provided with a concave-convex structure containing graphic information, an aluminum layer is attached to a concave surface (convex surface) of the concave-convex structure, the ink layer is close to the convex surface (concave surface) of the concave-convex structure and is attached to the aluminum layer of the concave surface (convex surface), the graphic structure of the structural layer is convexly displayed by comparing the aluminum layer with the ink layer, and a hollow-out effect of locally aluminizing in the concave-convex structure is formed. The invention also discloses a preparation method of the image-text anti-counterfeiting structure. According to the technical scheme, aiming at the condition that the printing effect of the existing micro-image-text structure is poor, the two-stage concave-convex structure design is adopted, different coatings are adopted to compare the concave-convex structures to be prominent, and the safety performance of the image-text anti-counterfeiting film is effectively improved by combining the micro-lens array.
Description
Technical Field
The invention belongs to the field of anti-counterfeiting devices, and particularly relates to a micro-lens array-based image-text anti-counterfeiting structure and a preparation method thereof.
Background
The micro lens array is an array formed by lenses with micron-sized clear aperture and relief depth, not only has the basic functions of focusing, imaging and the like of the traditional lens, but also has the characteristics of small unit size and high integration level, so that the micro lens array can complete the functions which cannot be completed by the traditional optical element and can form a plurality of novel optical systems. For example, the micro-lens array is applied to micro-pictures and texts, the micro-lenses and the Moore magnification technology are utilized to magnify the corresponding micro-pictures and texts, and the magnified clear pictures and texts which are visible to human eyes can be displayed through design, and the micro-lens array has dynamic effect and depth of field effect. In practice, microlens arrays are often used in the field of microlithographic security. The method has the characteristics of complex process procedure, high difficulty and easy identification for common people, and is expected to become a mainstream technical scheme of a new generation of high-end public anti-counterfeiting technology. The method is widely applied to articles such as banknotes, identity documents, securities and the like, such as currency security threads of dollars, Korean dollars, Mexico coins, Danish Kelang, Chilean Biso, British pound and the like.
Specifically, the microlens array reproducing microimage technology product generally comprises a microlens array layer and an image-text layer. The optical characteristics of the microlens array layer, which is the most important optical element layer, determine the performance of the entire security device. Under the common circumstances, in the anti-counterfeiting technical field, especially in the micro-image-text anti-counterfeiting technical field, the structure of the micro-image-text is very surprising, the thickness of character strokes can even reach below 5 micrometers, and the height of characters reaches below 20 micrometers. In practical manufacturing processes, this size of the microimages is far beyond the limits of conventional printing techniques. Aiming at the problem, the prior art generally adopts holographic lithography to prepare micro-pictures and texts, but the product prepared by the method has poor aluminizing effect, insufficient contrast of the micro-pictures and texts and unclear final displayed effect patterns of the product. And aiming at the problem of contrast of the micro-image and text, a colored printing method is adopted in the prior art. Specifically, the micro-groove filling method is to form a micro-image-text region into a groove structure and then fill the groove with color ink. However, the preparation method has high requirements on ink filling and printing processes, and the control difficulty in actual operation is high.
Disclosure of Invention
In view of the above drawbacks and needs of the prior art, the present invention provides a microlens array-based image-text anti-counterfeiting structure and a method for manufacturing the same, which at least partially solve the above problems. According to the technical scheme, aiming at the conditions that the existing micro-image-text structure is poor in printing effect and image-text effect, a two-stage concave-convex structure design is adopted, different coatings are adopted to compare the concave-convex structures to be prominent, and the safety performance of the image-text anti-counterfeiting film is effectively improved by combining a micro-lens array.
In order to achieve the above object, according to one aspect of the present invention, there is provided a method for preparing a microlens array-based image-text anti-counterfeiting structure, comprising,
s1, uniformly coating a UV curing material or a thermoplastic resin coating on one side of the substrate layer, and stamping uniformly-distributed concave-convex structures containing image-text information on the coating in a UV stamping or hot stamping mode to form a structural layer;
s2, uniformly coating a volatile layer on the convex surface of the concave-convex structure, and not coating the volatile layer on the concave surface, wherein the volatile layer is formed by coating volatile substances and has volatility;
s3, depositing a metal layer on the concave-convex structure of the structural layer, wherein the metal layer is deposited in the area without silicone oil, and the metal layer is not deposited in the area coated with silicone oil, so as to obtain a hollow structure with a concave surface deposited with the metal layer and a convex surface not deposited with the metal layer;
s4, printing the ink layer on the basis of the metal layer, and giving the color to the structural layer without the metal layer, so that the structural layer, the metal layer and the ink layer can be observed to form a colorful image-text information structure with clear edges on one side of the substrate layer;
s5, preparing a back glue layer on the ink layer to obtain the image-text anti-counterfeiting structure.
As a preferred embodiment of the technical scheme of the invention, the method further comprises the steps of uniformly coating a UV curing material on the other side of the substrate layer to obtain a second coating layer, forming a micro lens array on the second coating layer through nanoimprint, wherein the micro lens array is matched with the concave-convex structure of the structural layer, so that the concave-convex structure has a more attractive effect, and the anti-counterfeiting performance is enhanced.
According to one aspect of the technical scheme of the invention, the preparation method of the image-text anti-counterfeiting structure based on the micro-lens array is characterized by comprising the following steps,
s1', uniformly coating a UV curing material or a thermoplastic resin coating on one side of a substrate layer, and stamping a concave-convex structure containing graphic and text information on the coating in a UV stamping or hot stamping mode to form a structural layer;
s2', uniformly coating a layer of volatile paint on the concave-convex structure to the same height, and forming a volatile layer with large concave surface thickness and small convex surface thickness;
s3', depositing a metal layer on the concave-convex structure of the structural layer, volatilizing the volatile layer on the convex surface completely to form an aluminum layer with a certain thickness, and stopping deposition when the volatile layer on the concave surface is not volatilized completely, so as to obtain a hollow structure with the metal layer deposited on the convex surface and the metal layer not deposited on the concave surface;
s4', printing the ink layer on the basis of the metal layer, and endowing the structural layer without the metal layer with color, so that the structural layer, the metal layer and the ink layer can be observed to form a colorful image-text information structure with clear edges on one side of the substrate layer;
s5', coating the back glue layer on the ink layer to obtain the image-text anti-counterfeiting structure.
As a preferred embodiment of the technical scheme of the invention, the method further comprises the steps of uniformly coating a UV curing material on the other side of the substrate layer to obtain a second coating layer, forming a micro lens array on the second coating layer through nanoimprint, wherein the micro lens array is matched with the concave-convex structure of the structural layer, so that the concave-convex structure has a more attractive effect, and the anti-counterfeiting performance is enhanced.
According to one aspect of the technical scheme of the invention, the image-text anti-counterfeiting structure prepared by the preparation method of any one of claims 1 to 4 comprises a substrate layer, a micro image-text layer and a back glue layer which are sequentially stacked, wherein the substrate layer is used as a protective layer at the outermost side, and the glue layer is used for being attached to the surface of a marker,
the micro image-text layer comprises a structural layer, a metal layer and an ink layer which are sequentially laminated, wherein one side of the structural layer is close to the substrate layer, the other side of the structural layer is provided with a concave-convex structure containing image-text information, an aluminum layer is attached to the concave surface of the concave-convex structure, and the ink layer is close to the convex surface of the concave-convex structure and is attached to the aluminum layer of the concave surface; or
The micro image-text layer comprises a structural layer, a metal layer and an ink layer which are sequentially laminated, wherein one side of the structural layer is close to the substrate layer, the other side of the structural layer is provided with a concave-convex structure containing image-text information, an aluminum layer is attached to the convex surface of the concave-convex structure, and the ink layer is close to the concave surface of the concave-convex structure and is attached to the aluminum layer of the concave surface;
in this way, the picture and text structure of the structural layer is convexly displayed by comparing the aluminum layer with the ink layer, the hollow-out effect of locally aluminizing in the concave-convex structure is formed, and the anti-counterfeiting effect of the picture and text information can be improved.
As a preferred choice of the technical scheme of the invention, the image-text anti-counterfeiting structure further comprises a micro-lens array layer, and the micro-lens array layer and the micro-image-text layer are respectively arranged at two sides of the substrate layer; the micro lens array layer comprises a plurality of micro lenses arranged in an array form.
Preferably, the difference in height between the upper surface and the lower surface of the relief structure is 0.3 to 5 μm.
As a preferable aspect of the present invention, the focal lengths of the plurality of microlenses arranged in an array are preferably equal.
As a preferred choice of the technical scheme of the invention, the arrangement period of the micro lens array is preferably matched with the micro image-text of the structural layer.
As a preferred aspect of the present invention, the thickness of the base film layer matches the focal length of the micro lens, and the concave-convex structure is preferably located right at the focal point of the micro lens.
Generally, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:
1) according to the technical scheme, the micro-lens layer is additionally arranged on the substrate layer and comprises a plurality of micro-lenses, the lens array corresponds to the concave-convex structure comprising the image-text information on the other side of the substrate layer, namely each micro-lens corresponds to one concave-convex structure, and the concave-convex structures are located on the focal lengths of the corresponding micro-lenses, so that the image-text anti-counterfeiting information contained in the concave-convex structures can be better presented under the optical action of the micro-lenses, and the film has a better anti-counterfeiting effect.
2) According to the technical scheme, the image-text information area and the background area are positioned at different heights, the information area and the background area can be respectively lined with ink or an aluminum layer, the aluminum layer can be locally deposited on the concave-convex structure of the structural layer by utilizing the characteristic, the ink is printed on the structural layer without the aluminum layer, and the obtained color micro-image-text information with the locally hollowed metal layer presents a floating or sinking dynamic color image-text anti-counterfeiting effect under the action of the micro-lens array.
3) According to the technical scheme, the edge boundary of the concave-convex structure can be accurately outlined in a mode of controlling the local deposition of the metal layer through the volatile layer, and under the comparison between the ink layer and the metal layer, the obtained micro-graph and text is clear in structure, bright in color, high in ornamental artistry and strong in anti-counterfeiting capacity, and the preparation method is relatively simple and is easy for batch production.
Drawings
FIG. 1 is a structural diagram of an image-text anti-counterfeiting film in an embodiment of the technical scheme of the invention;
fig. 2 is a flow chart of the preparation of the image-text anti-counterfeiting film in the embodiment of the technical scheme of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other. The present invention will be described in further detail with reference to specific embodiments.
FIG. 1 is a structural cross-sectional view of a security film. As shown in fig. 1, the holographic anti-counterfeiting hot stamping film comprises a micro-lens array layer 2, a substrate layer 1, a micro-image-text layer 3 and a back glue layer 4 which are sequentially overlapped from top to bottom, wherein the micro-image-text layer comprises a micro-image-text concave-convex structural layer 31, an aluminum plating layer 32 and an ink layer 33.
The substrate layer 1 is arranged between the micro-lens array layer 2 and the micro-image-text layer 3, the substrate layer is preferably a transparent film, the transparency provides feasibility for observing the micro-image-text from the micro-lens array, and meanwhile, the thickness of the film is matched with the focal length of the micro-lens array, so that clear amplified micro-image-text can be observed. The micro lens array can generate small deviation relative to the period of the micro graph-text, and can form the sinking and floating effects of the micro graph-text, so that the anti-counterfeiting effect of the graph-text anti-counterfeiting structure is further improved.
In the present embodiment, the base material layer is preferably a transparent film such as PET, PP, PEN, or the like. The micro-lens array layer 2 can provide a micro-lens amplification function to amplify the image-text content, and the aperture D of the micro-lens in the embodiment is 10-200 microns, preferably 10-50 microns; the focal length of the microlenses is preferably 10-100 microns.
Preferably, the micro-pattern layer 3 includes a micro-pattern concave-convex structure layer 31 (i.e., the structure layer 31), an aluminum plating layer 32, and an ink layer 33. The concave-convex structure layer of the micro-graph is preferably a transparent coating, the height of the micro-graph area containing graph information is different from that of the background area, and the micro-graph area can be convex or concave. When the micro image-text area is convex, the surface of the background area is provided with an aluminum coating, and the micro image-text area is not provided with the aluminum coating.
When coating the metal layer (i.e. the aluminum layer 32), it is preferable in this embodiment to coat the metal layer on the concave surface of the concave-convex structure, and not coat the metal layer on the convex surface of the concave-convex structure, so that the concave-convex structure can exhibit a hollow-out effect. On this basis, can further scribble the ink layer on the metal level, like this, do not have the position of metal level on the structural layer and just can demonstrate the colour effect on printing ink layer to see from substrate layer one side, structural layer, metal level and printing ink layer have wholly constituted the picture and text anti-fake structure in this embodiment, and picture and text information degree of accuracy is high, and the colour is even, has better ornamental effect and anti-fake effect.
That is to say, on the basis that the partial deposition of metal level forms the fretwork effect, the printing ink layer has further given the little picture and text colour. When the micro-image-text area is concave, the concave area (the concave surface on the structural layer) of the concave-convex structure contains image-text information, and the background area (namely the convex surface on the structural layer) is not plated with aluminum. That is, the micro-graphic area has a metal layer and the ink layer gives the background area a color. When the micro image-text area is convex, the image-text information is positioned on the convex surface of the concave-convex structure (namely the convex surface of the structural layer), the surface of the background area (namely the concave surface of the structural layer) is provided with an aluminum coating, the micro image-text area is not provided with the aluminum coating, and the ink layer is endowed with the color of the non-background area. In this embodiment, the ink used in the ink layer includes various colors, such as white, blue, black, and red, as required. By combining the three-layer structure, the image-text anti-counterfeiting film can be observed from one side of the micro-lens array, and colored micro-image-texts can be observed.
Furthermore, in this embodiment, not only the graphic information can be respectively displayed on the convex surface or the concave surface of the structural layer (or printed in a positive or negative way), but also the metal layer can be deposited on the convex surface or the concave surface of the structure layer with the concave-convex structure by the design of the volatile layer. The setting form of the graphic information and the deposition form of the metal layer are respectively matched with the formed graphic anti-counterfeiting film, and both are within the disclosure range of the embodiment.
Preferably, the adhesive backing layer 4 is disposed at the lowest side of the film body and is used for attaching the anti-counterfeiting mark to the surfaces of various packages.
As a preference of this embodiment, with respect to the above product structure, the preparation method is as follows:
1) firstly, determining the focal length of a plurality of micro lenses in the micro lens array, and selecting a transparent film with proper thickness, wherein the thickness of the transparent film is matched with the focal length of the micro lens array. Specifically, the thickness of the transparent film is closely related to the focal length of the microlens, the film thickness, and the thickness of the concave-convex structure. In this embodiment, when the film of the substrate layer is selected, it is preferable to ensure that the concave-convex structure of the micro image-text layer matches with the micro lens, and it is preferable that the concave-convex structure is located just below the focal length of the micro lens, and more preferably, when the micro lens and the concave-convex structure have a certain misalignment, a good visual effect can be obtained. Further, as the film as the base material layer, a colored or colorless transparent film may be selected.
2) And forming a micro-lens array structure on the first surface of the substrate layer in a UV nano-imprinting mode. The preparation method of the microlens array is mature, and in this embodiment, the microlens array is preferably prepared directly on the substrate layer by using a UV nanoimprint equipment. The production process, the period and angle of the microlens array and the micrograph determine the amplification degree and dynamic effect of the micrograph. The microlens array layer is substantially a plurality of microlenses distributed according to a certain rule, which can be adjusted according to the design requirements of a specific image-text structure. Meanwhile, the micro-lens array layer and the micro-image-text layer are respectively positioned on two sides of the base material layer, so that the preparation of the micro-lens array layer and the preparation of the micro-image-text layer are not interfered with each other, and the micro-image-text layer and the back glue layer can be coated at any time in the process of coating the micro-image-text layer and the back glue layer and are not limited in the embodiment.
3) And (3) embossing the concave-convex structure of the micro-graph-text on the second surface of the substrate layer in a nano-embossing mode. The nano-imprinting mode can be UV imprinting or hot imprinting, both UV nano-imprinting and hot imprinting are traditional methods for preparing holographic replicas, and a hot imprinting process is preferably used in this embodiment.
In a typical hot stamping process, a nano material made of an acrylate resin material is preferably used for coating, in this embodiment, the coating temperature is preferably 80 to 150 ℃, the speed is preferably 60 to 90m/min, and the coating thickness is preferably 1 to 3 micrometers. The structure layer of the present embodiment can be obtained without imprinting the structure and without the concave-convex structure containing the graphic information.
The relief structure containing the graphic information is printed on the structural layer and can be printed by a holographic molding press. In this embodiment, preferably, the micro-pattern concave-convex structure on the nickel plate (master plate) is transferred onto the acrylic resin coating at 180 to 240 ℃, and the micro-pattern concave-convex structure is formed on the structural layer made of the acrylic resin.
In addition, UV nanoimprint is also a commonly used micro-nano structure replication method, and the method comprises the steps of coating a layer of UV coating on the second surface of the base material layer, then attaching the UV coating to a master plate of the micro-image-text concave-convex structure, carrying out UV exposure, and then separating the UV coating from the template, so that the micro-image-text micro-nano structure is formed on the second surface of the base material layer. In the present embodiment, the thermal imprinting and the UV nanoimprinting are only described as specific examples to form the textured structure of the structural layer, and are not to be considered as specific limitations of the present invention. Actually, there are many methods for preparing the mother plate of the micro image-text concave-convex structure, such as mask plate photoetching, laser direct writing photoetching, photoetching and physical etching combined, photoetching and chemical etching combined, and the like. For example, a method combining a mask and etching is adopted, firstly, a photoplotter is adopted to manufacture a film, a micro-graph and text pattern is presented on the film, then a layer of photoresist is coated on a glass substrate, and the photoresist is removed by exposure, development and cleaning, and then fluoride plasma etching is adopted, so that the concave-convex structure of the micro-graph and text is obtained. The above method can obtain the structure layer concave-convex structure in the embodiment.
4) Printing a volatile layer on the micro-image-text concave-convex structure layer, specifically printing volatile matters on the convex surface of the concave-convex structure layer, and forming the effect of locally coating the volatile matters on the structure layer. The volatile layer is composed of volatile matters and can be volatilized under certain conditions. The coating can be coated on the whole structure layer with the concave-convex structure to the same height, and can also be coated on the convex surface of the concave-convex structure only in a certain coating mode. In the embodiment, the volatile layer is preferably made of easily volatile silicone oil, and a partial silicone oil layer of 10-50nm is formed on the structural layer by a printing method such as flexography. In order to achieve the above effect, in this embodiment, the convex region (i.e., the convex surface of the concave-convex structure) on the micro-image-text concave-convex structure layer is in contact with the flexible plate, and the concave region (i.e., the concave surface of the concave-convex structure) is not in contact with the flexible plate, so as to form a silicon oil layer in the convex region, and the concave region has no local printing surface of the silicon oil layer.
5) After printing the volatile layer, a metal layer, preferably an aluminum layer, is plated on the surface of the partial silicon oil layer. The volatile layer is gradually evaporated under a certain condition, so that the concave-convex structure of the structural layer is shown, and the arrangement of the metal layer is realized. On the basis of the coating of the two volatilization layers, the metal layer has two evaporation modes. One is under the circumstances of layer coating to same height volatilizees, because concave convex structure's protruding face and depressed face have the difference in height, consequently the thickness of the layer of volatilizing of depressed face and protruding face is inconsistent, wherein the layer thickness of volatilizing of protruding face is less than the depressed face, consequently can evaporate completely in the layer of volatilizing that consequently can be prior to the depressed face, the aluminium lamination can deposit on concave convex structure's the protruding face this moment, stop the coating by vaporization before the layer of volatilizing of depressed face evaporates completely simultaneously, can realize that the protruding face has the metal level and the depressed face does not have the hollow out construction of metal level. The other type is that a certain coating mode is utilized, only the volatile layer is coated on the convex surface of the concave-convex structure, and in the evaporation process, because the concave surface does not have the volatile layer, the aluminum layer is firstly deposited on the concave surface, and meanwhile, the evaporation is stopped before the volatile layer of the convex surface is completely evaporated, so that the hollow-out structure with the metal layer on the concave surface and the metal layer on the convex surface can be obtained.
In this embodiment, a vacuum evaporation method is preferably adopted to deposit aluminum metal on the surface of the micro-pattern concave-convex structure layer. Because the surface of the aluminum foil is locally printed with the silicone oil, the aluminum layer cannot be deposited in the area corresponding to the silicone oil, and the hollowed-out aluminum plating effect is formed. Because the printing pattern of the silicon oil layer is consistent with the concave-convex structure (namely microstructure) containing graphic and text information, accurate aluminizing can be realized. Meanwhile, in the vacuum aluminum plating process, the volatile layer is continuously volatilized, and according to the volatilization condition and the volatilization rate of the silicone oil, the silicone oil is just volatilized completely when the aluminum plating is finished by combining the aluminum plating process condition.
6) Printing an ink layer, wherein the ink layer gives the micro-graph and text color. After the metal layer is prepared, the anti-counterfeiting film has a hollow-out effect. Specifically, for example, the metal layer is deposited on the concave surface of the concave-convex structure, the concave surface of the concave-convex structure has a metal reflection effect due to the deposition of the metal layer, and the convex surface does not have the metal layer deposited under the protection of the silicone oil, thereby showing the original colors (transparent effect) of the substrate layer and the structural layer. And when concave-convex structure's protruding face deposit metal level, concave-convex structure's protruding face has the effect of metal reflection owing to the deposit has the metal level, and sunken face does not then have the effect of metal reflection under the protection of the layer that volatilizees, demonstrates the transparent effect of substrate layer and structural layer and printing ink layer. In this embodiment, due to the local deposition of the aluminum layer and the coating of the ink layer, the entire image-text anti-counterfeiting film exhibits a hollow-out effect, and the micro image-text area exhibits a metal reflection effect of the aluminum layer, and the entire image-text area exhibits colored micro image-text. Further, according to the requirement, the ink layer can be in a single color, multiple colors or gradually changed colors, and the like, and the protection scope of the technical scheme of the invention is also included.
7) And coating a back glue layer. And coating a back glue layer on the ink layer according to the material to be bonded and the bonding process. The sixth step and the seventh step can be combined into a step, and the colored back glue layer is adopted, so that the color can be presented, and the function of bonding the substrate can be presented. This is not particularly limited in this embodiment.
Fig. 2 shows a specific process for preparing the image-text anti-counterfeiting film in the embodiment, and the following describes an exemplary method for preparing the security anti-counterfeiting film according to the present invention.
The first embodiment is as follows:
(1) a BOPET film of 30 micrometers is used as a base material layer 1, a micro-lens coating machine is adopted, a UV coating layer is coated on the first surface of the BOPET film and attached to a mother plate of a micro-lens array, and the BOPET film is peeled off after UV exposure and curing to form a micro-lens array layer 2.
(2) Preparing a micro-nano structure template: firstly, directly writing a pattern of a micro-graph and text on photoresist by adopting a laser direct writing technology of a holographic photoetching machine, then exposing, developing and electroforming to obtain a micro-graph and text metal nickel master plate with a concave-convex structure. The micro-image-text on the mother plate is of a concave structure, the content of the micro-image-text is the periodic arrangement of letters A, the height of the letters A is 20 micrometers, the character is an Arial font, the thickness of the strokes is 4 micrometers, the background is of a convex structure, and the height difference is 3 micrometers.
(3) And (3) coating a layer of acrylic resin on the second surface of the BOPET by using an anilox roller, wherein the thickness of the coating is 4 microns.
(4) And (3) stamping the microstructure on the metal nickel master plate on the acrylic resin coating under the action of heat and pressure by using a holographic molding press at 160-240 ℃, and forming a micro image-text concave-convex structure corresponding to the metal master plate on the surface of the acrylic resin coating, namely the micro image-text on the master plate is a convex structure, and the background is a concave structure.
(5) The silicone oil printing accessory of the aluminum plating machine is adopted, a full-plate flexible plate is used as a printing plate, and an extremely thin silicone oil layer (namely a volatile layer) is formed on the surface of the flexible plate at a proper silicone oil evaporation speed. Through printing, the protruding micro-image-text area is contacted with the flexible plate, and the surface of the flexible plate is printed with silicone oil; the recessed background area was not in contact with the flexible plate and was not printed with silicone oil.
(6) Through vacuum aluminizing, an aluminum layer is deposited in a background area without silicone oil, and the micro graph-text with the silicone oil cannot deposit the aluminum layer, so that the micro graph-text with the hollow effect is presented. Meanwhile, under the vacuum condition, the silicone oil is volatilized continuously, and the thickness of the silicone oil layer is reduced continuously or even is not reduced.
(7) And coating a blue ink layer on the metal aluminum layer by adopting an anilox roller coating process.
(8) Coating a layer of SBS hot melt adhesive by using a hot melt adhesive coating machine under the conditions of 180 ℃ and 200 ℃; and then die cutting and slitting are carried out to obtain the safety anti-counterfeiting film with the dynamic effect of the micro-image-text reproduced by the micro-lens array.
The second embodiment:
(1) selecting a 30-micron transparent BOPET film as a substrate layer 1; and (3) coating a UV coating on the first surface of the BOPET film by adopting a micro-lens coating machine, attaching the UV coating to the master mask of the micro-lens array, and stripping after UV exposure curing to form the micro-lens array.
(2) Preparing a mask plate by adopting a fine shrinkage mode, covering the mask plate, preparing a concave-convex structure of the micro-graph and text after exposure and development, and electroforming to obtain the micro-graph and text metal nickel master plate with the concave-convex structure. The micro graph-text on the mother plate is of a convex structure, the background is of a concave structure, and the height difference is 3 micrometers.
(3) Coating a 5-micron UV coating on the base material layer by adopting an anilox roller coating method;
(4) the UV coating is attached to a mother plate of metal nickel for exposure, the micro-nano structure on the nickel plate is copied to the UV coating, the UV coating is changed from a liquid state to a solid state after exposure, the micro-nano structure is fixed, and a concave-convex structure of micro-pictures and texts is formed, namely the micro-pictures and texts are concave and the background is convex.
(5) The silicone oil printing accessory of the aluminum plating machine is adopted, a full-plate flexible plate is used as a printing plate, and an extremely thin silicone oil layer (namely a volatile layer) is formed on the surface of the flexible plate at a proper silicone oil evaporation speed. In this embodiment, the concave-convex structure of structural layer is fully covered to the silicon oil layer, and coating thickness surpasses the difference in height of concave region and protruding region of concave-convex structure to make the upper surface height of the volatile layer on the whole structural layer surface unanimous. Therefore, the thickness of the silicon oil layer in the concave area is larger than the height of the silicon oil layer in the convex area, and the silicon oil layer in the convex area can be volatilized firstly when volatilizing.
(6) Through vacuum aluminizing, an aluminum layer is deposited in a micro-image-text area without silicone oil, but the aluminum layer cannot be deposited in a background area with the silicone oil, so that an aluminized micro-image-text effect is presented. Meanwhile, under the vacuum condition, the silicone oil is volatilized continuously, and the thickness of the silicone oil layer is reduced continuously or even is not reduced.
(7) Coating blue hot-melt pressure-sensitive adhesive on the aluminum layer at 180 ℃, and compounding the aluminum layer with release paper; and then die cutting, stripping and wide inspection are carried out to obtain the safety anti-counterfeiting mark with macroscopic dynamic image-text effect.
Further, in the process of preparing the image-text anti-counterfeiting film in this embodiment, the micro-lens array layer may be prepared prior to the micro-image-text layer, or the micro-image-text layer may be prepared first and then the micro-lens array layer is prepared. In this embodiment, the process of preparing the image-text anti-counterfeiting film is described by preparing the microlens array layer first, and the preparation sequence of the two layers is not specifically limited in the technical scheme of the present invention.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A method for preparing an image-text anti-counterfeiting structure based on a micro-lens array is characterized by comprising the following steps,
s1', uniformly coating a UV curing material or a thermoplastic resin coating on one side of a substrate layer, and stamping a concave-convex structure containing graphic and text information on the coating in a UV stamping or hot stamping mode to form a structural layer;
s2', uniformly coating a layer of volatile paint on the concave-convex structure to the same height, and forming a volatile layer with large concave surface thickness and small convex surface thickness;
s3', depositing a metal layer on the concave-convex structure of the structural layer by adopting a vacuum evaporation mode, completely volatilizing the volatilization layer on the convex surface to form an aluminum layer with a certain thickness, and stopping deposition when the volatilization layer on the concave surface is not completely volatilized, so as to obtain a hollow structure with the metal layer deposited on the convex surface and the metal layer not deposited on the concave surface;
s4', printing the ink layer on the basis of the metal layer, and endowing the structural layer without the metal layer with color, so that the structural layer, the metal layer and the ink layer can be observed to form a colorful image-text information structure with clear edges on one side of the substrate layer;
s5', coating the back glue layer on the ink layer to obtain the image-text anti-counterfeiting structure.
2. The method for preparing an image-text anti-counterfeiting structure based on the microlens array according to claim 1, further comprising the steps of uniformly coating a UV curing material on the other side of the substrate layer to obtain a second coating layer, forming the microlens array on the second coating layer through nanoimprint, and matching the microlens array with the concave-convex structure of the structural layer, so that the concave-convex structure presents a more attractive effect and the anti-counterfeiting performance is enhanced.
3. The image-text anti-counterfeiting structure prepared by the preparation method according to any one of claims 1 to 2, which comprises a substrate layer, a micro image-text layer and a back adhesive layer which are sequentially stacked, wherein the substrate layer is used as a protective layer on the outermost side, and the adhesive layer is used for being attached to the surface of a marker,
the micro image-text layer comprises a structural layer, a metal layer and an ink layer which are sequentially laminated, wherein one side of the structural layer is close to the substrate layer, the other side of the structural layer is provided with a concave-convex structure containing image-text information, an aluminum layer is attached to the convex surface of the concave-convex structure, and the ink layer is close to the concave surface of the concave-convex structure and is attached to the aluminum layer of the concave surface;
in this way, the picture and text structure of the structural layer is convexly displayed by comparing the aluminum layer with the ink layer, the hollow-out effect of locally aluminizing in the concave-convex structure is formed, and the anti-counterfeiting effect of the picture and text information can be improved.
4. The image-text anti-counterfeiting structure based on the micro-lens array according to claim 3, wherein the image-text anti-counterfeiting structure further comprises a micro-lens array layer, and the micro-lens array layer and the micro-image-text layer are respectively arranged on two sides of the substrate layer; the micro lens array layer comprises a plurality of micro lenses arranged in an array form.
5. The lenticular array-based image-text anti-counterfeiting structure according to claim 3 or 4, wherein the difference between the heights of the upper surface and the lower surface of the concave-convex structure is 0.3-5 microns.
6. The lenticular array-based teletext anti-counterfeiting structure according to claim 4, wherein the focal lengths of the plurality of microlenses arranged in the array are preferably equal.
7. The image-text anti-counterfeiting structure based on the microlens array according to any one of claims 3 to 4, wherein the arrangement period of the microlens array is preferably matched with the microimages and texts of the structural layer.
8. The image-text anti-counterfeiting structure based on the micro-lens array according to any one of claims 3 to 4, wherein the thickness of the substrate layer is matched with the focal length of the micro-lens, and the concave-convex structure is preferably located right at the focal point of the micro-lens.
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| JP6609402B2 (en) * | 2014-06-19 | 2019-11-20 | デクセリアルズ株式会社 | Optical film and manufacturing method thereof |
| CN110014762B (en) * | 2019-04-17 | 2021-08-17 | 深圳市柏星龙创意包装股份有限公司 | Gold stamping film and manufacturing process thereof, decoding sheet and manufacturing process thereof, and anti-counterfeiting decoding method |
| CN109979310A (en) * | 2019-05-17 | 2019-07-05 | 四川芯辰光微纳科技有限公司 | A kind of picture and text protection structure and preparation method thereof based on dynamic anti-fake film |
| CN110415602A (en) * | 2019-06-13 | 2019-11-05 | 武汉华工图像技术开发有限公司 | A kind of double-colored dynamic anti-fake film and preparation method thereof |
| CN111477094B (en) * | 2020-04-07 | 2022-07-26 | 苏州印象镭射科技有限公司 | 3D touch anti-counterfeiting mark with micro-nano textures and manufacturing method thereof |
| CN113568182A (en) * | 2020-04-28 | 2021-10-29 | 上海天臣防伪技术股份有限公司 | Local bright light variable image optical system and manufacturing method thereof |
| CN112562489B (en) * | 2020-12-15 | 2022-12-23 | 武汉华工图像技术开发有限公司 | Variable dynamic holographic anti-counterfeiting mark and preparation method thereof |
| CN115674933A (en) * | 2021-07-28 | 2023-02-03 | 中钞特种防伪科技有限公司 | Customizable anti-counterfeiting element and anti-counterfeiting product |
| CN114708787B (en) * | 2022-03-14 | 2023-10-03 | 武汉华工图像技术开发有限公司 | 3D anti-counterfeiting film, manufacturing method of 3D anti-counterfeiting film and 3D anti-counterfeiting label |
| CN118832943A (en) * | 2023-04-24 | 2024-10-25 | 中钞特种防伪科技有限公司 | Security element |
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| CN103342060B (en) * | 2013-06-18 | 2016-01-20 | 坤达国际有限公司 | A kind of three-dimensional image printed matter and three-dimensional image printing process |
| CN203325345U (en) * | 2013-07-01 | 2013-12-04 | 成都得迈科贸有限公司 | Composite integrated type micro-lens anti-fake mark |
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| CN106808835B (en) * | 2015-12-01 | 2018-06-22 | 中钞特种防伪科技有限公司 | Optical anti-counterfeit element and preparation method thereof and optical anti-counterfeiting product |
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