CN109291673B - Accurately aluminized patterned holographic anti-counterfeiting device and preparation method thereof - Google Patents
Accurately aluminized patterned holographic anti-counterfeiting device and preparation method thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
- B41M3/14—Security printing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
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Abstract
The invention discloses a patterned holographic anti-counterfeiting device capable of accurately aluminizing, which comprises a substrate layer, an imaging layer and a back glue layer which are sequentially stacked, wherein the imaging layer comprises a structural layer and a metal layer which are stacked, one side of the structural layer is attached to the substrate layer, the other side of the structural layer is provided with a gradient micro-nano structure, the micro-nano structure comprises a first concave-convex structure and a second concave-convex structure, and the second concave-convex structure is positioned at a concave part of the first concave-convex structure; the metal layer is arranged on the convex surface of the first concave-convex structure, and the hollow effect of the metal layer is formed by the aluminum plating difference between the concave surface and the convex surface of the first concave-convex structure, so that the holographic anti-counterfeiting device has a holographic optical variable anti-counterfeiting effect. The technical scheme of the invention adopts a patterned aluminum layer evaporation mode aiming at the conditions of low printing precision and complex aluminum washing process of the current ink registration printing, can effectively improve the aluminum plating precision of the holographic anti-counterfeiting device, and simultaneously simplifies the operation flow.
Description
Technical Field
The invention belongs to the field of anti-counterfeiting devices, and particularly relates to a patterned holographic anti-counterfeiting device capable of accurately aluminizing and a preparation method thereof.
Background
Holographic anti-counterfeiting is a novel anti-counterfeiting technology developed by applying a laser holographic technology, and is also called laser holographic anti-counterfeiting. The laser holography technology is a stereographic technology which is rapidly developed after the appearance of a laser in the sixties of the twentieth century. With the progress of other anti-counterfeiting technologies, holographic anti-counterfeiting is also newly developed and applied. The holographic anti-counterfeiting technology has the characteristics of easy identification, high technological content, easy batch production and difficult copying, and is widely applied to the anti-counterfeiting field. The early holographic anti-counterfeiting technology is a grating effect prepared by interference of two beams of light, and later, the pixel photoetching technology realizes automatic photoetching. The diffraction grating effect of monochrome, homothetic different image, dynamic and the like is expanded to the new optical effects of zero-order diffraction anti-counterfeiting technology, purple light effect, platinum relief, lens reproduction and the like. The holographic anti-counterfeiting technology is developed to the present, and the new optical anti-counterfeiting technology is widely applied to the aspects of national certificates, cigarette packet packaging and brand protection.
However, with the development of technology, the requirements for holographic anti-counterfeiting technology in real life are higher and higher. In order to increase the threshold of the holographic anti-counterfeiting technology, the bidirectional positioning aluminum-washing holographic anti-counterfeiting technology is widely popularized and is already used by bills, outsourced certificates, valuable papers and the like in Euro and many other countries. In China, the medicine is also used in the Lizhu medicine industry, the Xinan medicine industry, the Momeide medicine and the like. The currently used aluminum washing process is a water aluminum washing technology, namely, brushing aluminum ink (the ink is soluble in water) is printed on the surface of a mould pressing layer with an optical microstructure, then aluminum is plated, and then an optical film is immersed in water, wherein the aluminum layer of an area containing the aluminum washing ink is dissolved in water together with the aluminum washing ink and falls off, and an area without the aluminum washing ink remains the aluminum layer to form a local aluminum washing pattern. The aluminum washing precision of the method depends on the registration precision of the aluminum washing ink and the holographic pattern. So far, the register precision of the mode can only reach +/-0.2 mm, and the high-precision register printing effect cannot be obtained. Meanwhile, the process is complex because aluminum is plated firstly and then washed.
Disclosure of Invention
In view of the above drawbacks and needs of the prior art, the present invention provides a patterned holographic anti-counterfeiting device with precise aluminum plating and a method for manufacturing the same, which can at least partially solve the above problems. The technical scheme of the invention adopts a nano aluminum evaporation plating mode aiming at the conditions of low printing precision of the current ink registration printing and complex aluminum washing process, can effectively improve the aluminum plating precision of the holographic anti-counterfeiting device, and simultaneously simplifies the operation flow.
To achieve the above objects, according to one aspect of the present invention, there is provided a method for manufacturing a patterned holographic security device with precision aluminum plating, comprising,
s1, coating a nano-imprinting coating on the base film layer, and imprinting the gradient micro-nano structure on the coating in a nano-imprinting mode to obtain a structural layer; the gradient micro-nano structure comprises a first concave-convex structure and a second concave-convex structure, wherein the second concave-convex structure is positioned on the concave surface of the first concave-convex structure;
s2, uniformly coating a volatilization layer on the convex surface of the first concave-convex structure, and not coating the volatilization layer on the concave surface; the volatile layer is coated by volatile substances and has volatility;
s3, a metal layer is evaporated on the surface of the gradient micro-nano structure, the metal layer is formed on the concave surface of the first concave-convex structure in a deposition mode, the concave surface and the convex surface of the first concave-convex structure are mutually contrasted to form a hollow effect with the metal layer in a partial area, and therefore the gradient micro-nano structure presents a holographic optical variable anti-counterfeiting effect;
s4, coating a back glue layer on the basis of the metal layer to obtain the accurately aluminized patterned holographic anti-counterfeiting device.
As a preferred embodiment of the technical scheme of the present invention, the micro-nano structure includes a first concave-convex structure and a second concave-convex structure, wherein the second concave-convex structure is located in a concave portion of the first concave-convex structure.
According to one aspect of the invention, the precisely aluminized patterned holographic anti-counterfeiting device prepared by the preparation method comprises a substrate layer, an imaging layer and a back adhesive layer which are sequentially stacked, wherein the substrate layer is used as an outermost protective layer, and the back adhesive layer is used for bonding with the surface of a substrate to be ironed,
the imaging layer comprises a structural layer and a metal layer which are arranged in a stacked mode, one side of the structural layer is attached to the base material layer, a gradient micro-nano structure is arranged on the other side of the structural layer, the micro-nano structure comprises a first concave-convex structure and a second concave-convex structure, and the second concave-convex structure is located in a concave portion of the first concave-convex structure, so that the gradient micro-nano structure of the structural layer is formed;
the metal level sets up on first concave-convex structure's sunken face, and first concave-convex structure's sunken face contrasts with protruding face each other and forms the fretwork effect that the regional area of structural layer has the metal level to make gradient micro-nano structure demonstrate holographic light and become anti-fake effect.
As a preferable aspect of the present invention, a height difference between the convex surface and the concave surface of the first concavo-convex structure is preferably larger than that of the second concavo-convex structure.
As a preferable aspect of the present invention, the difference in height between the convex surface and the concave surface of the first concavo-convex structure is 0.5 to 10 micrometers, preferably 1 to 3 micrometers.
As one optimization of the technical scheme of the invention, the height difference between the convex surface and the concave surface of the second concave-convex structure is preferably 50-500 nanometers, and the second concave-convex structure presents holographic optical variable anti-counterfeiting effect.
As a preference of the technical scheme of the invention, the thickness of the metal layer is preferably 20-80 nanometers.
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 mode of precisely coating the volatile layer in advance is adopted, so that the metal layer can only be deposited at the position without the volatile layer, the hollow metal layer which is precisely matched with the concave-convex structure containing the anti-counterfeiting information in the structural layer is obtained, the anti-counterfeiting information is precisely positioned, the anti-counterfeiting function of the holographic anti-counterfeiting device is improved, the preparation process of the holographic anti-counterfeiting device is simplified, and the coating of the volatile layer is strictly controlled.
2) According to the technical scheme, the design of the gradient micro-nano structure is adopted, anti-counterfeiting information (image-text information) is presented by adopting a two-stage concave-convex structure, and under the design of the two-stage concave-convex structure, an image-text information area (with a concave-convex structure area) and a background area (without the concave-convex structure area) are at different heights, so that the image-text information of the concave-convex structure area is further highlighted; and the two-stage concave-convex structure design has better attractive effect under the action of an optical device.
3) According to the technical scheme, the two-stage concave-convex structure of the gradient micro-nano structure is displayed in a hollow manner, the concave surface and the convex surface of the concave-convex structure can adopt different coatings, for example, a display mode that a metal layer is combined with an ink layer is adopted, under the action of the micro-lens array, the two-stage concave-convex structure can present a more attractive effect, and meanwhile, the anti-counterfeiting effect of the image-text anti-counterfeiting film can be further improved through the contrast division.
Drawings
FIG. 1 is a structural cross-sectional view of a patterned holographic security device with precision aluminizing in an embodiment of the present disclosure;
fig. 2 is a preferred schematic diagram of a gradient micro-nano structure in an embodiment of the present invention;
fig. 3 is another preferred schematic diagram of a gradient micro-nano structure in an embodiment of the present invention;
FIG. 4 is a method for manufacturing a patterned holographic anti-counterfeiting device with aluminum plating accurately according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a silicon oil layer coating on a structural layer according to an embodiment of the present 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.
In the embodiment of the technical scheme of the invention, the invention specifically discloses a patterned holographic anti-counterfeiting device accurately plated with aluminum and a preparation method thereof, and the following description is combined with a specific structure and a preparation process.
Fig. 1 is a structural cross-sectional view of the patterned holographic security device in this embodiment. The holographic anti-counterfeiting device sequentially comprises the following coating sequences from bottom to top: substrate layer 1, structural layer 2, metal reflecting layer 5, the layer of volatilizing 4, gum layer 3. Wherein, the volatilization layer 4 gradually volatilizes to be complete in the deposition process of the metal reflection layer 5. The deposition of the metal layer is stopped before the volatile paint of the volatile layer is completely volatilized, and the effect of locally depositing the metal layer on the structural layer can be realized. The deposition area of the metal layer is related to the coating effect of the volatile layer.
In this embodiment, the substrate layer 1 is located on the outermost side of the entire holographic anti-counterfeiting device, and plays a role in covering and protecting the internal structure of the entire holographic anti-counterfeiting device. The material of the substrate layer may be various conventional thin film materials suitable for processing laser hologram patterns, such as a PET biaxially oriented film, and the like, which is not particularly limited in this embodiment.
The structural layer 2 is an information carrier of the holographic anti-counterfeiting device in the embodiment, and is one of key components. One side of the metal reflecting layer is attached to the substrate layer, the other side of the metal reflecting layer is processed by a certain process means (such as a mould pressing process) to obtain one or more laser holographic anti-counterfeiting patterns, and the metal reflecting layer can well play a role in anti-counterfeiting by combining the optical reflection effect of the metal reflecting layer. Generally, according to the product requirements, the laser holographic anti-counterfeiting pattern of the structural layer can provide basic anti-counterfeiting information including information of manufacturers, brand marks and the like. Furthermore, according to the needs of the product, the structural layer can bear multiple functions, such as endowing a release function, arranging a release layer or adopting a resin layer with the release function on the upper surface of the structural layer, and endowing the holographic anti-counterfeiting mark with wear resistance, and the structural layer is arranged into a multilayer structure formed by the release layer, the wear-resistant layer, the mould pressing layer and the like, and can endow different colors, such as additionally arranging a color layer and the like.
In this embodiment, the structural layer is preferably obtained by nanoimprinting. The nano-imprinting mode comprises a UV nano-imprinting mode and a hot-imprinting mode, and the UV nano-imprinting mode and the hot-imprinting mode are both traditional holographic replication preparation methods. As a typical hot stamping process, the ink is preferably made of an acrylate resin material, the coating temperature is 80-120 ℃, and the speed is 60-90 m/min; when in operation, a holographic molding press can be used for molding the micro-nano knot on the nickel plate onto the acrylic resin coating at 180-240 ℃ to form a structural layer.
The microstructure on the structural layer is preferably imprinted on the structural layer by means of nanoimprint. The microstructure of the mould pressing imaging layer is a gradient micro-nano structure and comprises concave-convex structures with two height grades, the height difference of the concave-convex structure of the first grade is larger than that of the concave-convex structure of the second grade, a convex structure area of the concave-convex structure of the first grade is not provided with a metal reflection layer, and the surface of a concave area of the concave-convex structure of the first grade contains the concave-convex structure of the second grade. The second level relief structure exhibits holographic optical effects such as diffraction-based monochromatic, dynamic, homeotropic, depth, holographic lenses, violet and reflection-based cat eyes, platinum relief, and zero-order diffraction, nano-optics, and the like.
In order to realize accurate vapor deposition of the metal layer on the structural layer, in this embodiment, a volatile layer is selectively coated on the structural layer before vapor deposition of the metal layer, and the coating used for the volatile layer is a volatile substance, such as silicone oil with certain condensation and volatility. The principle of the method is that when the metal layer is evaporated on the structural layer, as the partial area of the structural layer is coated with volatile substances, the volatile substances are continuously volatilized under the evaporation environment, so that metal particles cannot be deposited on the corresponding area, and the metal layer cannot be formed. And the area without the volatile substance can be smoothly deposited, thereby forming the effect of locally depositing a metal layer on the structural layer. And the area without the deposited metal layer on the structural layer is compared with the area without the deposited metal layer, and the two areas are mutually compared to finally form the hollow structure.
In other words, the coating accuracy of the volatile layer determines the accuracy of the metal layer deposition. In this embodiment, the silicone oil layer is preferably made of special silicone oil, and then a 10-50nm silicone oil layer is formed on the flexible plate by means of flexography. The process is a well established process such as the silicone oil printing system attendant to the galileo, italy, vacuum equipment system and the leber, germany, vacuum aluminizing system. The system adopts a flash evaporation process (flashvo) to form a uniform silicon oil layer on a coating roller, and then the silicon oil is printed on a structural layer through a flexographic printing roller. In this embodiment, a full plate is preferably used as the printing plate. As shown in fig. 5, when printing is performed on the surface of the structural layer, the convex region of the structural layer is in contact with the flexible plate, the concave region is not in contact with the flexible plate, and a silicon oil layer is formed on the surface of the structural layer in the convex region and the concave region is not provided with the silicon oil layer.
Further, the metal layer is also one of the key components of the patterned holographic anti-counterfeiting device in the embodiment. In particular, the second relief structure in combination with the metal layer may well reveal the holographic image contained therein. The metal layer in this embodiment is preferably an aluminum plated layer, and the metal aluminum is deposited on the surface of the structural layer by vacuum evaporation. Because the first-level protruding area of the structure layer is printed with the silicone oil, the aluminum layer cannot be deposited, and the local hollow effect is formed. Since the silicone oil printed pattern is a complementary pattern to the holographic pattern (i.e. of the first structure), accurate aluminizing can be achieved.
The back glue layer is positioned at the innermost side of the patterned holographic anti-counterfeiting device and is used for attaching the holographic anti-counterfeiting device to the mark. The anti-counterfeiting mark has holographic anti-counterfeiting technology and high-precision patterned aluminum plating effect when observed from one side of the substrate layer.
In addition, as a preferable example of this embodiment, in the case of the gradient micro-nano structure, if there is a large-area hologram pattern, that is, if the second concavo-convex structure region is large, the hologram pattern region is brought into contact with the printing plate roller due to the elastic deformation of the flexible plate, and silicone oil is printed on the pattern, and further aluminum plating cannot be performed. In order to avoid the situation, as a supplement of the invention, the second concave-convex structure area is larger, a first-level convex structure in a lattice mode is additionally arranged in the second-level concave-convex area, the height of the lattice is equal to that of the first-level concave-convex structure, the size of the lattice is preferably 2-20 micrometers, and the distance between the lattice and the first-level concave-convex structure is 10-100 micrometers.
The core process in the preparation method is the design of a concave-convex structure and the printing of a silicon oil layer. The design of the concave-convex structure has been described a lot, and it is added that the microstructure is lost in the nanoimprint process, that is, the microstructure is deformed, the convex structure of the first grade is deformed into a circular arc, and the like. The silicon oil layer is printed by adopting a silicon oil coating accessory of a Lebao aluminum plating machine, and the difference is that a non-pattern flexible plate is adopted as a printing plate, the hardness of the flexible plate and the pressure during printing have great influence on the printing effect, and the insufficient hardness of the flexible plate can cause the flexible plate to deform and easily contact with the second-level microstructure, so that the preset effect cannot be achieved. Suitable pressure and flexo hardness are optimal to contact the printing plate with the molded film, but not the second grade microstructure. Through the method, the volatile layer which is only in contact with the protruding surface of the first concave-convex structure can be accurately coated on the structural layer, and the specific implementation manner of the volatile layer is not particularly limited in this embodiment.
In this embodiment, since the gradient micro-nano structure is provided and the metal layer is locally deposited, the following structures are all within the protection scope of the technical scheme of the present invention: 1) the second relief structure 312 is located on the recessed side of the first relief structure 31, a metal layer is deposited on the recessed side of the first relief structure (i.e. on the second relief structure), and no metal layer is deposited on the raised side 311 of the first relief structure, as shown in fig. 2; 2) the second relief structure 312 is located on the convex side 311 of the first relief structure, a metal layer is deposited on the convex side 311 of the first relief structure (i.e. on the second relief structure), and no metal layer is deposited on the concave side 312 of the first relief structure 31, as shown in fig. 3. The second structure is derived, after the gradient micro-nano structure is formed, a volatile silicon oil layer is formed on the gradient structure by a coating mode such as blade coating. At the moment, a layer of thicker silicone oil is formed on the concave surface of the first-grade concave-convex structure, a layer of thinner silicone oil is formed on the convex surface of the first concave-convex structure, the silicone oil layer continuously volatilizes under the vacuum condition, and the thin silicone oil on the convex surface preferentially and completely volatilizes. And aluminizing, forming an aluminized layer on the convex surface, not aluminized on the concave surface, and finally gluing to form the holographic optical variable anti-counterfeiting film which is locally and accurately aluminized.
The invention will be further explained below with reference to the specific process for preparing the holographic anti-counterfeiting device.
The first embodiment is as follows:
(1) taking a BOPET film with the thickness of 15 microns as a base material film to obtain a base material layer 1;
(2) for example, by means of anilox roller coating, the surface of PET is uniformly coated with water-based emulsifying wax at a temperature of 80-120 ℃ and a speed of 60-90 m/min, so as to form a release layer 2;
(3) continuously coating an acrylic resin coating on the release layer 2, wherein the thickness of the resin layer is 2 microns, the coating temperature is 80-150 ℃, and the speed is 60-90 m/min;
(4) preparing a micro-nano structure template: firstly, photoetching by using a holographic photoetching machine to prepare a concave-convex structure of a second grade, electroforming to obtain a metal nickel plate, coating photoresist on the metal nickel plate, then preparing a mask plate corresponding to a pattern of the concave-convex structure of the first grade, accurately positioning the metal nickel plate and the mask plate by using a magnifier to ensure that the positioning precision reaches 1 micron, and then exposing, developing and chemically etching to obtain a concave structure of the first grade to obtain a metal nickel master plate with a gradient micro-nano structure.
(5) 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 gradient micro-nano structure corresponding to the metal master plate on the surface of the acrylic resin coating.
(6) The silicone oil printing accessory of a Laibao aluminum plating machine is adopted, a full-plate flexible plate is used as a printing plate, and a silicone oil layer with the thickness of 10-50 nanometers is formed on the surface of the flexible plate at a proper silicone oil evaporation speed. Printing a first-grade protruding structure of the structural layer in contact with the flexible board, and printing silicone oil on the surface of the protruding structure; and the concave-convex structure of the first level (the concave-convex structure of the second level) is not in contact with the flexible board, and no printing silicone oil is printed.
(7) Through vacuum aluminizing, an aluminum layer is deposited in an area without silicone oil, but the aluminum layer cannot be deposited in an area with the silicone oil, so that the aluminum layer is hollowed out. 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.
(8) Coating hot stamping gum on the metal reflecting layer 5 at the temperature of 80-120 ℃; and then, slitting and width checking are carried out to obtain the accurate aluminized holographic anti-counterfeiting hot stamping film.
Finally, the hot stamping film is submitted to a printing factory, the hot stamping film is hot stamped on the surface of the outer package through a hot stamping machine in the packaging process, the substrate layer and the release layer on the outermost side are removed, the rest of the structure layer, the metal reflection layer and the gum layer are reserved, and the mark has a holographic laser anti-counterfeiting pattern and an accurate hollowed-out aluminizing effect.
The second embodiment:
(1) the BOPET precoating film of 30 microns is used as a base material film, one side of the base material film is coated with a precoating layer, and the precoating layer and the UV coating have strong adhesive force, namely a base material layer 1;
(2) coating a 5-micron UV coating on the base material layer by adopting an anilox roller coating method on the pre-coated surface of the base material layer;
(3) the preparation of the micro-nano structure nickel plate adopts holographic photoetching direct writing equipment, designs holographic patterns through Photoshop, then carries out photoetching, adopts high light intensity exposure in a first-level concave area, adopts normal holographic optical parameters in a first-level convex area (a second-level concave-convex structure, a holographic area), and obtains a gradient micro-nano structure through development and cleaning.
(3) Laminating UV coating and metallic nickel's master to expose from the UV face, on duplicating the micro-nano structure on the nickel edition to the UV coating, the UV coating is changed into solid-state by the liquid after the exposure, and micro-nano structure can be fixed, forms the lower surface and has micro-nano structure's structural layer 2.
(4) The silicone oil printing accessory of a Laibao aluminum plating machine is adopted, a full-plate flexible plate is used as a printing plate, and a silicone oil layer with the thickness of 10-50 nanometers is formed on the surface of the flexible plate at a proper silicone oil evaporation speed. By printing, silicone oil is printed on the raised areas of the structural layer, and then by vacuum aluminizing, an aluminum layer is deposited on the areas without silicone oil. And the aluminum layer can not be deposited in the area with the silicone oil, so that the hollow effect is achieved. 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.
(5) Coating hot-melt pressure-sensitive adhesive on the metal reflecting layer 5 at 180 ℃, and compounding the hot-melt pressure-sensitive adhesive with release paper; and then die cutting, slitting and width checking are carried out, and the accurate aluminized holographic anti-counterfeiting mark product is obtained.
Preferably, in the step (4) of the first and second embodiments, if a volatile layer (e.g., a silicon oil layer) is coated on the gradient micro-nano structure, during deposition, the evaporation of the metal layer can be performed after substances on the convex surface of the gradient micro-nano structure are volatilized. What is obtained at this time is a structure having a metal layer on the convex side of the first relief structure and no metal layer on the concave side.
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 (6)
1. A method for preparing a patterned holographic anti-counterfeiting device with accurate aluminum plating is characterized by comprising the following steps of,
s1, coating a nano-imprinting coating on the base film layer, and imprinting the gradient micro-nano structure on the coating in a nano-imprinting mode to obtain a structural layer; the gradient micro-nano structure comprises a first concave-convex structure and a second concave-convex structure, wherein the second concave-convex structure is positioned on the concave surface of the first concave-convex structure;
s2, uniformly coating a volatilization layer on the convex surface of the first concave-convex structure, and not coating the volatilization layer on the concave surface; the volatile layer is coated by volatile substances and has volatility;
s3, a metal layer is evaporated on the surface of the gradient micro-nano structure, the metal layer is deposited on the concave surface of the first concave-convex structure, the metal layer is not deposited on the convex surface of the first concave-convex structure, the concave surface and the convex surface of the first concave-convex structure are mutually contrasted to form a hollow-out effect with the metal layer in a partial area, so that the gradient micro-nano structure presents a holographic optical variable anti-counterfeiting effect;
s4, coating a back glue layer on the basis of the metal layer to obtain the accurately aluminized patterned holographic anti-counterfeiting device.
2. The precisely aluminized patterned holographic anti-counterfeiting device prepared according to the preparation method of claim 1, comprising a substrate layer, an imaging layer and a back glue layer which are sequentially stacked, wherein the substrate layer is used as an outermost protective layer, and the back glue layer is used for bonding with the surface of a substrate to be ironed,
the imaging layer comprises a structural layer and a metal layer which are arranged in a stacked mode, one side of the structural layer is attached to the base material layer, a gradient micro-nano structure is arranged on the other side of the structural layer, the micro-nano structure comprises a first concave-convex structure and a second concave-convex structure, and the second concave-convex structure is located in a concave portion of the first concave-convex structure, so that the gradient micro-nano structure of the structural layer is formed;
the metal level sets up on first concave-convex structure's sunken face, and first concave-convex structure's sunken face contrasts with protruding face each other and forms the fretwork effect that the regional area of structural layer has the metal level to make gradient micro-nano structure demonstrate holographic light and become anti-fake effect.
3. A precisely aluminized patterned holographic security device according to claim 2, wherein the difference in height between the convex and concave faces of the first relief structure is greater than the second relief structure.
4. A precisely aluminized patterned holographic security device according to claim 2 or 3, wherein the difference in height between the convex and concave faces of the first relief structure is 0.5 to 10 microns.
5. A precisely aluminized patterned holographic security device according to claim 2 or 3, wherein the height difference between the convex surface and the concave surface of the second relief structure is 50-500 nm, and the second relief structure exhibits holographic optically variable security.
6. A precisely aluminized patterned holographic security device according to claim 2 or 3, wherein the metal layer has a thickness of 20 to 80 nanometers.
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| CN112211035A (en) * | 2019-07-10 | 2021-01-12 | 苏州苏大维格科技集团股份有限公司 | Manufacturing method of high-registration-precision packaging paper |
| CN111986557A (en) * | 2020-08-28 | 2020-11-24 | 江阴通利光电科技有限公司 | Method for manufacturing label anti-counterfeiting film by adopting localized coating |
| CN114132062A (en) * | 2020-09-03 | 2022-03-04 | 苏州苏大维格科技集团股份有限公司 | A kind of micro-nano latent image anti-counterfeiting device and its preparation method and plate roller |
| CN112613591B (en) * | 2020-12-29 | 2024-04-09 | 苏州印象镭射科技有限公司 | Anti-counterfeiting label and preparation method thereof |
| CN115497403B (en) * | 2022-05-20 | 2025-04-15 | 苏州苏大维格科技集团股份有限公司 | A multi-color three-dimensional dynamic image anti-counterfeiting card and its preparation method |
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| KR101960402B1 (en) * | 2012-08-03 | 2019-03-20 | 쑤저우 에스브이쥐 옵트로닉스 테크놀러지 컴퍼니 리미티드 | Colored, dynamic, and amplified safety film |
| CN104704401B (en) * | 2012-11-19 | 2017-09-26 | 凸版印刷株式会社 | Anti-counterfeit structure body and its manufacture method |
| CN103963510B (en) * | 2013-01-29 | 2015-12-23 | 中钞特种防伪科技有限公司 | A kind of method preparing optical anti-counterfeit element |
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| CN104562855A (en) * | 2015-01-12 | 2015-04-29 | 上海金叶包装材料有限公司 | Production process with local pattern vacuum aluminum plating and lasering multiple anti-counterfeiting lining paper for cigarettes |
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