Anti-counterfeiting packaging box with double visual effects and preparation method of anti-counterfeiting packaging box

Abstract

The invention provides an anti-counterfeiting packaging box with double visual effects and a preparation method thereof, the anti-counterfeiting packaging box comprises a box body and a box cover, a hot stamping area is arranged on the back of the box body, a hot stamping foil is arranged in the hot stamping area, a micro image-text array is embedded in the hot stamping foil, and the hot stamping area sinks towards the inside of the box body to form a groove; the box cover is provided with a windowing area, the windowing area is provided with a decoding piece, and the side, facing the box body, of the decoding piece is provided with a micro lens array matched with the micro image-text array. Magnetic attraction assemblies are arranged on the periphery of the hot stamping area and the periphery of the windowing area. When the box cover is closed, the gold stamping foil is exposed on the back surface of the box body and shows metallic luster; when the box cover is opened, the box cover is attached to the back face of the box body through the magnetic attraction assembly, the decoding piece is embedded into the groove, the micro lens array and the micro image-text array are overlapped and precisely aligned in a single-point mode, and a Moire magnified image is presented. The gold stamping foil embedded with the micro image-text array is arranged on the back face of the box body, the decoding sheet provided with the micro lens array is arranged on the box cover, and after the box cover is attached to the back face of the box body, a Moire magnified image is presented.

Description

Technical Field

[0001] The present application relates to the field of anti-counterfeiting packaging boxes, and in particular to an anti-counterfeiting packaging box with a dual visual effect and a preparation method thereof. Background Art

[0002] One of the current mainstream 3D micro-nano anti-counterfeiting technologies is micro-focusing moiré imaging technology, and the most common micro-focusing moiré imaging technology is the micro-focusing moiré imaging technology with a transmissive structure. It is usually based on the precise alignment of microlens arrays and micro-image arrays on both sides of an optically transparent substrate. The micro-image array should be located in the focal plane of the microlens array or near it, and the two should be of similar size and period. The combination of the two produces a moiré magnification effect and the parallax displacement effect of binocular vision of the human eye, achieving a visual effect of stereoscopic depth of field and angular displacement directly presented to the naked eye.

[0003] Existing anti-counterfeiting packaging boxes that use 3D micro-nano anti-counterfeiting technology have the following problems: 1) High production costs and difficulty in large-scale production; 2) Weak anti-counterfeiting performance makes the anti-counterfeiting packaging boxes easy to imitate and cannot effectively protect the goods; 3) The single dimension of visual effects affects the market appeal and anti-counterfeiting recognition of the anti-counterfeiting packaging boxes. Summary of the Invention

[0004] In view of the above problems, the present application is proposed to provide a dual visual effect anti-counterfeiting packaging box and a preparation method thereof that overcomes the above problems or at least partially solves the above problems, comprising:

[0005] A double visual effect anti-counterfeiting packaging box, comprising a box body and a box cover;

[0006] The back of the box body is provided with a hot stamping area, the hot stamping area is provided with a hot stamping foil, the hot stamping foil is embedded with a micro-image array, and the hot stamping area is recessed into the box body to form a groove;

[0007] The box cover is provided with a window area, the window area is provided with a decoding plate, and the decoding plate is provided with a micro lens array adapted to the micro image array on a side facing the box body;

[0008] Magnetic components are provided around the hot stamping area and around the window area;

[0009] When the box lid is closed, the hot stamping foil is exposed on the back of the box body and presents a metallic luster; when the box lid is opened, the box lid is attached to the back of the box body through the magnetic attraction component, the decoding chip is embedded in the groove, and the microlens array and the micro-image array are overlapped and accurately aligned at a single point to present a moiré magnified image.

[0010] Furthermore, at least two guide posts are provided around the window area near the magnetic attraction component, and the hot stamping area is provided with guide holes corresponding to the guide posts.

[0011] Furthermore, the decoding sheet is an optically transparent substrate with a thickness of 300-1000 um.

[0012] Furthermore, the curvature radius of the microlens array is 100-400 μm, and the line width of the micro-image array is 8-12 μm.

[0013] Furthermore, the micro-image array and the micro-lens array are both arranged in a two-dimensional Bravais lattice, and the period error and consistent tilt deviation threshold of the micro-image array and the micro-lens array are greater than ±2°.

[0014] Furthermore, the depth of the groove is the same as the thickness of the decoding plate, the size of the decoding plate is smaller than the size of the groove, and the size of the window area is smaller than the size of the decoding plate.

[0015] A method for preparing a double visual effect anti-counterfeiting packaging box, comprising the steps of:

[0016] Embedding the micro-image array in a hot stamping foil, hot stamping the hot stamping foil on the hot stamping area on the back of the box body, and recessing the hot stamping area to a preset depth to form a groove;

[0017] Fabricating a microlens array adapted to the micro-image array on the surface of an optically transparent substrate to obtain a decoding sheet;

[0018] A window is die-cut in a predetermined area of ​​the box cover, and the decoding sheet is affixed to the window area so that the microlens array of the decoding sheet faces the interior of the box body;

[0019] Grooves are respectively formed around the hot stamping area and around the window area, and magnetic components are installed thereon.

[0020] Furthermore, the step of embedding the micro-image array into the hot stamping foil includes:

[0021] Printing the micro-image array on the release layer surface of the hot stamping foil by a nano-printing process;

[0022] Alternatively, the micro-image array is produced on the release layer surface of the hot stamping foil by photolithography molding combined with embossing, color filling and ink scraping technology.

[0023] Furthermore, it also includes:

[0024] The period of the moiré pattern is controlled by adjusting the period or angle of the microlens array and the micro-image array.

[0025] Furthermore, the curvature radius of the microlens array is designed to satisfy the following focal length formula:

[0026] f=r / (n-1)=[(φ 2 +4h 2 ) / (8h)] / (n-1)≈L

[0027] Where f is the focal length, r is the radius of curvature, n is the refractive index of the optical substrate, and L is the thickness of the decoding film.

[0028] This application has the following advantages:

[0029] In an embodiment of the present application, compared with the problems of high production cost, low anti-counterfeiting performance and single visual effect dimension in the prior art, the present application provides a solution to deconstruct the naked-eye 3D micro-nano anti-counterfeiting technology, specifically: it includes a box body and a box lid, the back of the box body is provided with a hot stamping area, the hot stamping area is provided with a hot stamping foil, the hot stamping foil is embedded with a micro-image array, and the hot stamping area is recessed into the box body to form a groove; the box lid is provided with a window area, the window area is provided with a decoding plate, and the side of the decoding plate facing the box body is provided with a micro-lens array adapted to the micro-image array; magnetic components are provided around the hot stamping area and the window area; when the box lid is closed, the hot stamping foil is exposed to the back of the box body and presents a metallic luster; when the box lid is opened, the box lid is attached to the back of the box body by the magnetic component, the decoding plate is embedded in the groove, and the micro-lens array and the micro-image array are overlapped and accurately aligned at a single point to present a moiré magnification image. By applying hot stamping foil embedded with a micro-image array to the back of the box and a decoding sheet with a micro-lens array to the lid, a magnified moiré image is created when the lid is attached to the back of the box. By deconstructing naked-eye 3D micro-nano anti-counterfeiting technology, manufacturing complexity is reduced, significantly enhancing the anti-counterfeiting performance of the packaging box while also creating a multi-dimensional visual effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for the description of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] Figure 1 This is a structural diagram of a double visual effect anti-counterfeiting packaging box provided by an embodiment of the present application;

[0032] Figure 2 This is a flowchart of the steps of a method for preparing a double visual effect anti-counterfeiting packaging box provided in one embodiment of the present application.

[0033] The reference numerals in the drawings of the specification are as follows:

[0034] 1. Box body; 2. Hot stamping area; 21. Hot stamping foil; 22. Micro-graphic array; 3. Box lid; 4. Window area; 41. Decoder chip; 42. Micro-lens array; 5. Magnetic component. DETAILED DESCRIPTION

[0035] To make the objectives, features, and advantages of this application more readily apparent, the present application is further described below in conjunction with the accompanying drawings and specific embodiments. It is apparent that the embodiments described are only a portion of the embodiments of this application, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments in this application without inventive effort are also within the scope of protection of this application.

[0036] The inventors have found through analysis of existing technologies that there are still some technical difficulties in the existing 3D micro-nano anti-counterfeiting technology:

[0037] (1) High-precision manufacturing is difficult, and the mass production qualification rate is low. This type of anti-counterfeiting element is usually prepared based on transparent film materials (whose thickness is generally 30-100um), and is mainly used for composite films or labels, etc., so relatively thin transparent films (whose thickness is generally 30-100um) are generally selected. The thinner the film, the smaller the curvature radius of the corresponding microlens needs to be (the range should be 10-50um) in order to achieve micro-focusing of the anti-counterfeiting element according to the microlens focal length calculation formula (the thickness of the film is three times the curvature radius of the microlens), and the smaller the line width of the corresponding micro-image needs to be (about 2.5um), that is, the printing resolution of not less than 8000dpi. General printing cannot achieve such a high printing resolution. Therefore, high-precision manufacturing of microlenses, micro-images and their single-point high-precision alignment (allowing periodic error to be submicron level) is difficult, and the mass production qualification rate is low.

[0038] (2) First-line anti-counterfeiting, weak anti-counterfeiting performance. The anti-counterfeiting effect of this type of anti-counterfeiting element is directly visible to the naked eye. It belongs to the first-line anti-counterfeiting technology, with a low imitation barrier and weak anti-counterfeiting performance.

[0039] (3) The visual effect dimension is single and lacks novelty. Although the visual effect of this type of anti-counterfeiting element is significant, it is all generated by human vision based on the angular displacement of the element surface. The visual effect dimension is single, lacks novelty, and is prone to aesthetic fatigue.

[0040] The inventor came up with the idea of ​​deconstructing the naked-eye 3D micro-nano anti-counterfeiting technology, developing a new micro-nano anti-counterfeiting technology that integrates first- and second-line anti-counterfeiting, and developed a dual-visual-effect anti-counterfeiting packaging box.

[0041] It should be noted that, in any embodiment of the present invention, the packaging box is based on a swing-lid packaging box structure, in which the box lid (swing lid) and the box body are connected by a common folding edge, and the box lid can be folded upward along the folding edge.

[0042] Reference Figure 1 , shows a double visual effect anti-counterfeiting packaging box provided by an embodiment of the present application, comprising a box body 1 and a box cover 3;

[0043] The back of the box body 1 is provided with a hot stamping area 2, the hot stamping area 2 is provided with a hot stamping foil 21, the hot stamping foil 21 is embedded with a micro-image array 22, and the hot stamping area 2 is recessed into the box body 1 to form a groove;

[0044] The box cover 3 is provided with a window area 4, the window area 4 is provided with a decoding plate 41, and the decoding plate 41 is provided with a micro lens array 42 adapted to the micro image array 22 on a side facing the box body 1;

[0045] Magnetic components 5 are provided around the hot stamping area 2 and around the window area 4;

[0046] When the box cover 3 is closed, the hot stamping foil 21 is exposed on the back of the box body 1 and presents a metallic luster; when the box cover 3 is opened, the box cover 3 is attached to the back of the box body 1 through the magnetic attraction component 5, the decoding sheet 41 is embedded in the groove, and the microlens array 42 and the micro-image array 22 are overlapped and accurately aligned at a single point to present a moiré magnified image.

[0047] In the embodiment of the present application, compared with the problems of high production cost, low anti-counterfeiting performance and single visual effect dimension in the prior art, the present application provides a solution to deconstruct the naked eye 3D micro-nano anti-counterfeiting technology, specifically: comprising a box body 1 and a box cover 3, the back of the box body 1 is provided with a hot stamping area 2, the hot stamping area 2 is provided with a hot stamping foil 21, the hot stamping foil 21 is embedded with a micro-image array 22, the hot stamping area 2 is recessed into the box body 1 to form a groove; the box cover 3 is provided with a window area 4, the window area 4 is provided with a decoding piece 41, the decoding piece 41 A microlens array 42 is provided on the side facing the box body 1, compatible with the micro-image array 22. A magnetic assembly 5 is provided around the hot stamping area 2 and around the window area 4. When the lid 3 is closed, the hot stamping foil 21 is exposed on the back of the box body 1 and exhibits a metallic luster. When the lid 3 is opened, the magnetic assembly 5 affixes the lid 3 to the back of the box body 1, the decoding plate 41 is embedded in the groove, and the microlens array 42 overlaps and precisely aligns with the micro-image array 22, presenting a moiré magnification image. By placing the hot stamping foil 21 embedded with the micro-image array 22 on the back of the box body 1 and the decoding plate 41 with the microlens array 42 on the lid 3, a moiré magnification image is presented when the lid 3 is affixed to the back of the box body 1. By deconstructing naked-eye 3D micro-nano anti-counterfeiting technology, the manufacturing difficulty is reduced, significantly enhancing the anti-counterfeiting performance of the packaging box while also presenting a multi-dimensional visual effect.

[0048] Next, a double visual effect anti-counterfeiting packaging box in this exemplary embodiment will be further described.

[0049] It is understood that the hot stamping area 2 is provided in the area on the back of the box body 1 to which the box lid 3 can be folded along the folding edge. The hot stamping area 2 is recessed into the box body 1 to form a groove. The depth of the groove is the same as the thickness of the decoding chip 41, ensuring that the decoding chip 41 can fit tightly after being embedded. The size of the hot stamping area 2 is slightly larger than the size of the decoding chip 41, and the size difference is preferably 0.2-0.5mm. The hot stamping area 2 is hot stamped with hot stamping foil 21, and the hot stamping foil 21 is embedded with a micro-image array 22. The micro-image array 22 is printed on the release layer surface of the hot stamping foil 21 by a nano-printing process or a photolithography molding process combined with a printing, coloring, and scraping process. A magnetic attraction component 5 is provided around the hot stamping area 2 to fit the box lid 3 to the back of the box body 1 when the box lid 3 is closed.

[0050] As an example, the hierarchical structure of the hot stamping foil 21 is a base film layer, a release layer, a coloring layer, an aluminized layer, and an adhesive layer. Conventional photolithographic holographic hot stamping foil 21 has a base film layer, a release layer, a coloring layer, an embossed information layer, an aluminized layer, and an adhesive layer. The micro-image array 22 can be printed onto the surface of the release layer using nanoprinting to create a coloring layer, or the micro-image array 22 can be applied to the surface of the release layer using a combination of photolithographic embossing and embossing, coloring, and doctoring to create an embossed information layer. This allows for an integrated design of the micro-image array 22 and a holographic laser effect.

[0051] In a specific implementation, the release layer surface of the hot stamping foil 21 is made into a micro-image array 22 by a nano-printing process. The micro-image array 22 is a two-dimensional square Bravais dot matrix arrangement, and a single micro-image unit is a square pattern with a side length of 10μm, and the line width is controlled at 10μm. The hot stamping area 2 is set at the position where the box cover 3 on the back of the box body 1 can be folded. A rectangular area of ​​80mm×80mm is used, and the hot stamping foil 21 is fixed to this area by a hot stamping process. The hot stamping area 2 is recessed inward to a certain depth, and the groove depth is 500μm, which is the same as the thickness of the decoding plate 41. The groove size is designed to be 80.5mm×80.5mm, and a 0.25mm assembly gap is reserved compared to the decoding plate 41 (80mm×80mm) to ensure the mechanical positioning accuracy when the decoding plate 41 is embedded.

[0052] It should be noted that a microlens array 42 adapted to the micro-image array 22 is fabricated on the surface of an optically transparent substrate to form a decoding film 41. The thickness of the selected optically transparent substrate is relatively thick, greater than the thickness of existing transparent films (generally 30-100 μm). Therefore, in order to position the micro-image array 22 at or near the focal plane of the microlens array 42 to produce a moiré magnification imaging effect, the radius of curvature of the manufactured microlenses can be relatively increased, and the line width of the corresponding micro-images is also increased; both the micro-image array 22 and the microlens array 42 are arranged in a two-dimensional Bravais lattice, and the array consistency tilt deviation requirement and period error requirement threshold are increased, significantly improving the mass production qualification rate. Among them, the focal plane refers to the plane perpendicular to the optical axis of the microlens and passing through the focal point. For a single microlens (such as a convex lens) in the microlens array 42, parallel light will converge at the focal point after passing through the lens, and the plane formed by all the focal points is the focal plane.

[0053] In this embodiment, at least two guide posts are provided around the window area close to the magnetic component, and the hot stamping area is provided with guide holes corresponding to the guide posts.

[0054] As an example, 2-4 micro guide posts are positioned around the window area 4 of the flap, near the magnetic attraction points. When the flap is folded over to the back of the box, guide holes corresponding to the guide posts are positioned in the hot stamping area 2 of the flap, corresponding to the guide posts. "Corresponding" means that the position, size, and number of the guide holes correspond to the guide posts.

[0055] In this embodiment, the decoding sheet 41 is an optically transparent substrate with a thickness of 300-1000 μm.

[0056] As an example, the optically transparent substrate may be made of resin materials such as PET (polyester film), PP (polypropylene), PVC (polyvinyl chloride), PC (polycarbonate), PS (polystyrene), and PMMA (polymethyl methacrylate).

[0057] In this embodiment, the micro-image array 22 and the micro-lens array 42 are both arranged in a two-dimensional Bravais lattice, and the period error and consistent tilt deviation threshold of the micro-image array 22 and the micro-lens array 42 are greater than ±2°.

[0058] As an example, since the decoding film 41 can be made of an optically transparent substrate with a relatively thick thickness (300-1000 μm), the radius of curvature of the manufactured microlenses can be relatively increased to 100-400 μm in order to position the micro-image array 22 at or near the focal plane of the microlens array 42 to produce the moiré magnification imaging effect. The line width of the corresponding micro-image is also increased to 8-12 μm, preferably 10 μm. The period error requirements and the consistent tilt deviation requirements thresholds of the micro-image array 22 and the microlens array 42 are increased, with the deviation requirement being >±2°).

[0059] As an example, a window is die-cut in the corresponding area of ​​the packaging box cover 3, so that the size of the window area 4 is slightly smaller than that of the decoding film 41, with a size difference of preferably 0.8-2.0 mm. The decoding film 41 is attached to the window surface of the packaging box cover 3, and the microlens array 42 is located inside the window of the packaging box cover 3.

[0060] In a specific implementation, the window area 4 is provided in the center of the box lid 3, and the hot stamping area 2 is provided on the area on the back of the box body 1 that is folded along the folded edge of the box lid 3. The window area 4 is die-cut into a rectangular window of 79mm×79mm in the center of the box lid 3, and glue is applied to the edge of the window for pasting the decoding film 41. The window size is 1mm smaller than the decoding film 41 (80mm×80mm), forming an edge limiting structure. A PET optically transparent substrate with a thickness of 500μm is selected to make the decoding film 41, and a microlens array 42 is made on its surface. The microlens array 42 is a square Bravais lattice that matches the micro-graphic array 22, and the curvature radius of a single microlens is 200μm.

[0061] In one specific implementation, four slots with a diameter of 2mm and a depth of 1mm are provided beneath the packaging paper surrounding the rectangular hot stamping area 2, each containing a small magnet. Correspondingly, slots of the same size are provided beneath the packaging paper surrounding the rectangular window area 4 of the lid 3, embedding magnets of opposite polarity. When closed, the magnetic attraction force is ≥5N, ensuring that the lid 3 securely adheres to the back of the box body 1 through magnetic attraction. This allows the decoder chip 41 to be embedded within the slots, and the microlens array 42 and micrographic array 22 to overlap and precisely align at a single point.

[0062] When the packaging box lid 3 is opened, it swings and is tightly fitted due to the attraction of the small magnetic attraction on the back of the box body 1. This causes the decoding sheet 41 to fit precisely into the recessed position of the hot stamping area 2. The decoding sheet 41 and the hot stamping area 2 are superimposed in a predetermined relative position, resulting in precise single-point alignment between the microlens array 42 and the micro-graphic array 22. As a result, the micro-graphic information hidden in the hot stamping foil 21 is reconstructed with the microlens array 42, creating a 3D dynamic visual effect of floating or sinking three-dimensional depth of field and a moiré magnification image with angular displacement (if the micro-graphic array 22 is integrated with holographic lithography, it also has a holographic laser effect), thus providing anti-counterfeiting decoding.

[0063] When the packaging box cover 3 is closed, only the hot stamping area 2 presents the metallic (holographic laser) luster effect of the general hot stamping foil 21; the window area 4 of the box cover 3 can facilitate consumers to observe the product inside the box.

[0064] Reference Figure 2 , shows a method for preparing a double visual effect anti-counterfeiting packaging box provided by an embodiment of the present application, the method comprising:

[0065] S110, embedding the micro-image array 22 into the hot stamping foil 21, hot stamping the hot stamping foil 21 on the hot stamping area 2 on the back of the box body 1, and recessing the hot stamping area 2 to a preset depth to form a groove;

[0066] S120, making a micro lens array 42 adapted to the micro image array 22 on the surface of an optically transparent substrate to obtain a decoding sheet 41;

[0067] S130, die-cutting a window in a predetermined area of ​​the box cover 3, and pasting the decoding sheet 41 to the window area 4, with the microlens array 42 of the decoding sheet 41 facing the interior of the box body 1;

[0068] S140 , respectively making grooves around the hot stamping area 2 and around the window area 4 and installing magnetic components 5 .

[0069] Next, a method for preparing a double visual effect anti-counterfeiting packaging box in this exemplary embodiment will be further described.

[0070] As described in step S110 , the micro-image array 22 is embedded in the hot stamping foil 21 , the hot stamping foil 21 is hot stamped on the hot stamping area 2 on the back of the box body 1 , and the hot stamping area 2 is recessed to a preset depth to form a groove.

[0071] In one embodiment of the present invention, the specific process of “embedding the micro-image array 22 into the hot stamping foil 21 ” in step S110 may be further explained in conjunction with the following description.

[0072] As described in the following steps, the micro-image array 22 is printed on the release layer surface of the hot stamping foil 21 by nano-printing process; or, the micro-image array 22 is made on the release layer surface of the hot stamping foil 21 by photolithography molding combined with embossing, color filling and ink scraping process.

[0073] In one specific implementation, a micro-image array 22 is printed onto the release layer using nanoprinting to create a colored layer. Specifically, the release layer of the hot stamping foil 21 is subjected to corona treatment to increase surface tension and ensure ink adhesion. The micro-image array 22 is then printed onto the release layer using gravure or inkjet printing in a two-dimensional Bravais lattice pattern, which dries to form the colored layer.

[0074] In one specific implementation, the micro-image array 22 is formed on the surface of the release layer by photolithography and embossing combined with embossing, color filling, and scraping to form the embossed information layer. Specifically, a master is prepared and copied onto the surface of the release layer by hot embossing to form a micro-concave structure. Ink is then filled into the micro-concave structure using a squeegee, and excess ink is removed. After curing, the embossed information layer is formed.

[0075] In one specific implementation, the micro-image array 22 is integrated with the holographic laser effect. Specifically, a holographic grating structure is first fabricated through photolithography and molding to form a holographic laser background. Then, the micro-image array 22 is fabricated on the holographic background through nano-printing or molding and color filling processes. The ratio of the micro-image period to the holographic grating period is ensured to be greater than 10:1 to avoid optical interference.

[0076] In one embodiment of the present invention, the specific process of "stamping the hot stamping foil 21 on the hot stamping area 2 on the back of the box body 1 and recessing the hot stamping area 2 to a preset depth to form a groove" in step S110 can be further explained in combination with the following description.

[0077] As an example, a hot stamping method is used to apply a gold foil 21 to the hot stamping area 2 on the back of the packaging box 1, and the hot stamping area 2 is then recessed to a certain depth using a embossing process. Alternatively, a hot stamping method (i.e., an integrated hot stamping and embossing process) is used to recess the gold foil 21 to a certain depth on the back of the packaging box 1. The thickness of the decoder sheet 41 is equal to the depth of the recessed area 2, and the decoder sheet 41 is slightly smaller than the hot stamping area 2 (preferably a size difference of 0.2-0.5 mm). The hot stamping method can be hot stamping or cold stamping.

[0078] In a specific implementation, the prepared hot stamping foil 21 is passed through a hot stamping machine and hot stamped onto the hot stamping area 2 on the back of the box body 1 at a temperature of 180°C and a pressure of 5 MPa, and then the embossing process is performed through a hydraulic press, with a concave depth of 500 μm and a groove flatness error of <±10 μm.

[0079] As described in step S120 , a microlens array 42 adapted to the micro-image array 22 is fabricated on the surface of an optically transparent substrate to obtain a decoding sheet 41 .

[0080] As an example, a microlens array 42 adapted to the micro-image array 22 is fabricated on the surface of an optically transparent substrate by photolithography molding or photoresist thermal reflow to form a decoding sheet 41 .

[0081] In one specific implementation, a microlens array 42 is fabricated to match the micro-image array 22. A photoresist is spin-coated on a PET substrate, exposed through a mask, and then subjected to a heat reflow process. The heating temperature is controlled at 150°C for 30 minutes, resulting in a decoder sheet 41 with a microlens array 42 having a curvature radius of 300 μm.

[0082] As described in step S130 , a window is die-cut in a preset area of ​​the box cover 3 , and the decoding film 41 is attached to the window area 4 , so that the microlens array 42 of the decoding film 41 faces the interior of the box body 1 .

[0083] As an example, a window is die-cut in the corresponding area of ​​the packaging box cover 3, making the window size slightly smaller than the size of the decoding chip 41, preferably with a size difference of 0.8-2.0 mm. Glue is applied to the edge of the window in the packaging box cover 3 and the decoding chip 41 is affixed to the surface of the window in the packaging box cover 3. This ensures that the edge of the decoding chip 41 is firmly bonded to the edge of the window in the packaging box cover 3, and the microlens array 42 is located inside the window in the packaging box cover 3.

[0084] As an example, when a hot stamping foil micro-graphic array is stamped into a groove and a decoder sheet is affixed to the window area of ​​the box lid, it is difficult to ensure the single-point precise alignment of the units of the two arrays. In this embodiment, 2-4 micro guide posts are designed around the window area of ​​the swing lid, close to the magnetic attraction points, and micro guide holes that match the micro guide posts are set at corresponding positions in the hot stamping area on the back of the box body. The guide posts are preferably tapered guide posts with a diameter of approximately 1-2 mm and a height of 1-3 mm. The material of the guide posts can be wear-resistant engineering plastics, such as POM or nylon. The guide holes can be tapered guide holes or V-grooves, preferably tapered guide holes that match the guide posts.

[0085] As an example, auxiliary alignment marks, such as crosshairs or microdots, are added to the edges of the optically transparent substrate and the hot stamping area. These auxiliary alignment marks are manufactured simultaneously with the array units and are used only for production calibration, without affecting the final appearance. These auxiliary alignment marks enable array-level fine-tuning.

[0086] In one specific implementation, four micro-tapered guide posts, approximately 1mm in diameter and 2mm in height, are positioned around the window area of ​​the swing lid. Micro-tapered guide holes, matching the micro-tapered guide posts, are located in corresponding locations on the hot stamping area on the back of the box. When the swing lid is opened and approaches the back of the box, the guide posts preferentially contact the guide holes. The self-centering properties of the tapered slope guide the window area to roughly align with the hot stamping area, achieving coarse positioning of the array. An initial position error of ±0.5mm is tolerated at this stage. Crosshairs are also added to the edges of the optically transparent substrate and the hot stamping area for production calibration, achieving fine positioning of the array.

[0087] As described in step S140 , grooves are respectively formed around the hot stamping area 2 and around the window area 4 and magnetic components 5 are installed.

[0088] As an example, a small magnet is installed in the gray cardboard below the packaging paper around the hot stamping area 2 on the back of the packaging box body 1. A small magnet is installed in the gray cardboard below the packaging paper around the window area 4 of the packaging box cover 3. The magnets are shaped magnets, such as trapezoidal magnets, triangular magnets, or square magnets, and the use of shaped magnets achieves directional positioning of the array.

[0089] For example, the hot stamping accuracy of gold foil can be controlled by the positional relationship between the stamping area and the magnetic area. For example, machine vision can be used to magnify and inspect the distance between the stamping area and the surrounding magnetic areas to ensure the accuracy of the stamping area. Similarly, machine vision can be used to magnify and inspect the distance between the decoder and the surrounding magnetic areas to ensure the accuracy of the decoder placement. For precise control of the die-cutting area of ​​the packaging box, die-cutting deviations must be within the error range.

[0090] In a specific implementation, the magnetic attraction points are designed to be asymmetric or keyway structures through the layout of special-shaped magnets, such as a square magnet with a D-shaped slot, rather than a simple round magnet. Specifically, four neodymium magnets with tapered outer edges and a diameter of 3-5mm are embedded under the packaging box paper corresponding to the swing cover window area. Matching conical magnetic attraction grooves are set under the packaging box paper corresponding to the hot stamping area on the back of the box body, with ferrite or neodymium magnets embedded in them. Combined with the magnetic attraction, when the guide post of the box cover is fully inserted into the guide hole on the back of the box body, the two arrays enter the precise positioning range, and the magnetic attraction force tightens the two, using magnetic force to achieve unit-level alignment with an accuracy of up to ±10 microns, meeting the requirements of the microlens array.

[0091] When the flap is opened, the magnets automatically slide into the tapered grooves under magnetic attraction. The tapered slope generates radial force, forcing the two arrays to fine-tune their positions during the bonding process until they are perfectly aligned. The magnetic points should be placed at the four corners of the array area to form a "quadrilateral stability structure" to prevent rotational deviation.

[0092] In one embodiment of the present application, it further includes:

[0093] The period of the moiré pattern is controlled by adjusting the period or angle of the micro lens array 42 and the micro image array 22 .

[0094] It should be noted that the structural periodicity of the micro-image array 22 and the microlens array 42 is similar. Furthermore, the ratio of the period magnification of the micro-images in the micro-image array 22 after moiré magnification imaging to the period difference between the micro-image array 22 and the microlens array 42 should meet certain requirements. Assume that the periods of the microlens array 42 in the x- and y-directions of the decoding film 41 in this novel micro-nano anti-counterfeiting technology are t11 and t12, respectively, and the thickness of the decoding film 41 substrate is L, which should be roughly equivalent to the focal length of the microlenses. The x- and y-direction periods of the hot stamping area 2 of the micro-image array 2 in this novel micro-nano anti-counterfeiting technology are t21 and t22, respectively, and the micro-image array 22 layer is located on the focal plane of the microlens array 42 layer.

[0095] When the microlens array 42 of the decoding film 41 overlaps and interacts with the micro-image array 22 of the hot stamping area 2, a moiré magnification effect is generated. Based on the relevant formula for moiré magnification, the magnification of the micro-image in the x and y directions can be obtained as follows:

[0096] M x =t 11 / (t 21 -t 11 ), M y =t 12 / (t 22 -t 12 )(1)

[0097] M x With My When both are positive, the generated Moiré pattern has the same orientation as the micro-image in the corresponding x and y directions, and is a positive image; if both are negative, the generated Moiré pattern has the opposite orientation to the micro-image in the corresponding x and y directions, and is an inverted image. The size H of the Moiré pattern is:

[0098] H=T1 2 / |T1-T2| (2)

[0099] If there is a certain angle α between the microlens array 42 and the micro-image array 22, and the two arrays have different periods, t1 and t2 respectively, then the moiré pattern period is:

[0100]

[0101] According to the above formula, the period of the moiré pattern can be controlled by adjusting the period of the microlens array and the micro-image array, or the angle between them, thereby adjusting the moiré magnification. When the periods of the two arrays are the same (i.e., t1 = t2 = t), the magnification of the moiré pattern is:

[0102] M=T / t=1 / [2sin(α / 2)](4)

[0103] When the microlens height is set to h and the microlens size is Φ, the microlens curvature radius r is:

[0104] r=(φ 2 +4h 2 ) / (8h)(5)

[0105] This new micro-nano anti-counterfeiting technology should satisfy the requirement that the thickness L of the decoding film substrate is roughly equivalent to the focal length of the microlens. When the refractive index of the microlens is set to n, the focal length f of the microlens is:

[0106] f=r / (n-1)=[(φ 2 +4h 2 ) / (8h)] / (n-1)≈L(6)

[0107] The novel micro-nano anti-counterfeiting technology of the present invention overcomes the technical difficulties existing in the existing naked-eye 3D micro-nano anti-counterfeiting technology (micro-focusing moiré imaging technology) by deconstructing the naked-eye 3D micro-nano anti-counterfeiting technology and cleverly combining and reconstructing it based on the swing-lid packaging box structure with the hot stamping process and grating decoding. It can significantly enhance the anti-counterfeiting performance of the packaging box while presenting a multi-dimensional visual effect.

[0108] Although preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they become aware of the basic inventive concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0109] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or terminal device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or terminal device that includes the element.

[0110] The above is a detailed introduction to a dual visual effect anti-counterfeiting packaging box and a preparation method thereof provided by the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for general technical personnel in this field, based on the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A double visual effect anti-counterfeiting packaging box, comprising a box body and a box cover, characterized in that: The back of the box body is provided with a hot stamping area, the hot stamping area is provided with a hot stamping foil, the hot stamping foil is embedded with a micro-image array, and the hot stamping area is recessed into the box body to form a groove; The box cover is provided with a window area, the window area is provided with a decoding plate, and the decoding plate is provided with a micro lens array adapted to the micro image array on a side facing the box body; Magnetic components are provided around the hot stamping area and around the window area; When the box lid is closed, the hot stamping foil is exposed on the back of the box body and presents a metallic luster; when the box lid is opened, the box lid is attached to the back of the box body through the magnetic attraction component, the decoding chip is embedded in the groove, and the microlens array and the micro-image array are overlapped and accurately aligned at a single point to present a moiré magnified image.

2. The double visual effect anti-counterfeiting packaging box according to claim 1, characterized in that: At least two guide posts are provided around the window area close to the magnetic attraction component, and the hot stamping area is provided with guide holes corresponding to the guide posts.

3. The double visual effect anti-counterfeiting packaging box according to claim 1, characterized in that: The decoding sheet is an optically transparent substrate with a thickness of 300-1000 μm.

4. The double visual effect anti-counterfeiting packaging box according to claim 3, characterized in that: The curvature radius of the microlens array is 100-400 μm, and the line width of the micro-image array is 8-12 μm.

5. The double visual effect anti-counterfeiting packaging box according to claim 3, characterized in that: The micro-image array and the micro-lens array are both arranged in a two-dimensional Bravais lattice, and the period error and consistent tilt deviation threshold of the micro-image array and the micro-lens array are greater than ±2°.

6. The double visual effect anti-counterfeiting packaging box according to claim 1, characterized in that: The depth of the groove is the same as the thickness of the decoding plate, and the size of the decoding plate is smaller than the size of the groove, and the size of the window area is smaller than the size of the decoding plate.

7. A method for preparing a double visual effect anti-counterfeiting packaging box, characterized in that: Including steps: Embedding the micro-image array in a hot stamping foil, hot stamping the hot stamping foil on the hot stamping area on the back of the box body, and recessing the hot stamping area to a preset depth to form a groove; Fabricating a microlens array adapted to the micro-image array on the surface of an optically transparent substrate to obtain a decoding sheet; A window is die-cut in a predetermined area of ​​the box cover, and the decoding sheet is affixed to the window area so that the microlens array of the decoding sheet faces the interior of the box body; Grooves are respectively formed around the hot stamping area and around the window area, and magnetic components are installed thereon.

8. The method for preparing a double visual effect anti-counterfeiting packaging box according to claim 7, characterized in that: The step of embedding the micro-image array into the hot stamping foil includes: Printing the micro-image array on the release layer surface of the hot stamping foil by a nano-printing process; Alternatively, the micro-image array is produced on the release layer surface of the hot stamping foil by photolithography molding combined with embossing, color filling and ink scraping technology.

9. The method for preparing a double visual effect anti-counterfeiting packaging box according to claim 7, characterized in that: Also includes: The period of the moiré pattern is controlled by adjusting the period or angle of the microlens array and the micro-image array.

10. The method for preparing a double visual effect anti-counterfeiting packaging box according to claim 7, characterized in that: The curvature radius of the microlens array is designed to satisfy the following focal length formula: f=r / (n-1)=[(φ 2 +4h 2 ) / (8h)] / (n-1)≈L Where f is the focal length, r is the radius of curvature, n is the refractive index of the optical substrate, and L is the thickness of the decoding film.

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