Multi-layer body with 3D anti-counterfeiting effect and packaging box sheet

Abstract

The utility model relates to a cigarette packing anti -fake technical field especially, more layer body and packing box piece with 3D anti -fake effect is provided. This more layer body includes base material layer, sets up in micro lens array layer of base material layer front surface, sets up in microtruer graphic layer of base material layer back surface, the base material layer includes convex part and plane part, and make the base material layer's front surface include convex surface and front plane, make the base material layer's back surface include concave surface and back plane, micro lens array layer sets up in convex surface, microtruer graphic layer sets up in concave surface. In the application, by making micro lens array layer form curved surface structure, the natural change of the optical axis direction of micro lens in different areas is formed, a wider visual angle is covered, and even if the observer watches from the side at a large angle, clear, undistorted stereoscopic images can also be seen, and the light path change is more complex, a larger and smoother dynamic effect is provided.

Description

Technical Field

[0001] This utility model relates to the field of anti-counterfeiting technology for cigarette packaging, and in particular to a multi-layer body and packaging box sheet with 3D anti-counterfeiting effect. Background Technology

[0002] Packaging is a product's "silent salesperson." Besides protecting the product, it must also beautify, promote, and stimulate consumers' desire to buy, thereby enhancing the product's competitiveness in the market. Currently, most packaging is a two-dimensional planar design created through printing or spraying. With the continuous improvement of living standards, the requirements for product packaging have moved beyond simple visual decorations; they now also require anti-counterfeiting functions.

[0003] To enhance the decorative effect and anti-counterfeiting features of packaging, 3D image display technology has been introduced. Laser holography is currently the most widely used 3D display technology, but its observation conditions are quite demanding, making it difficult for consumers to determine the authenticity of labels. Furthermore, it is costly, has a small display size, and cannot be used for large-format packaging. In addition, the technology has become widespread, making product packaging easily imitated and copied, significantly reducing its anti-counterfeiting performance.

[0004] Existing technologies employ microlens array technology to achieve three-dimensional anti-counterfeiting. For example, patent document CN102991860A discloses an anti-counterfeiting packaging film with a three-dimensional, dynamic display effect. This film has front and back surfaces. The front surface of the film has a periodically arranged microlens array, and the back surface has a macroscopic pattern information layer. However, the effective viewing angle of this planar microlens array is limited. Another patent document CN223140293U discloses a label with a visual curved surface area for presenting a curved scrolling visual effect. The label includes a first microstructure layer, a substrate layer, and a second microstructure layer stacked sequentially. The first microstructure layer includes a first microlens array located in the visual curved surface area, and the second microstructure layer includes a first micro-graphic array corresponding to the first microlens array. The arrangement period of the first micro-graphic array gradually increases from the center of the visual curved surface outwards, and the arrangement period of the first micro-graphic array located at the center of the visual curved surface is greater than the arrangement period of the corresponding first microlens array. This existing technology achieves a curved surface scrolling visual effect by controlling the arrangement period of the micro-image array, but it still belongs to the planar microlens array, and its effective viewing angle is limited. Utility Model Content

[0005] This invention aims to solve the above problems by providing a multi-layer body and packaging box sheet with 3D anti-counterfeiting effect, which increases the effective viewing angle and improves anti-counterfeiting performance.

[0006] The technical solution to the problem of this utility model is, in a first aspect, to provide a multilayer body with 3D anti-counterfeiting effect, including a substrate layer, a microlens array layer disposed on the front surface of the substrate layer, and a micro-graphic layer disposed on the rear surface of the substrate layer. The substrate layer includes a protruding portion and a flat portion, such that the front surface of the substrate layer includes a convex surface and a front flat surface, and the rear surface of the substrate layer includes a concave surface and a rear flat surface; the microlens array layer is disposed on the convex surface, and the micro-graphic layer is disposed on the concave surface.

[0007] In this application, a microlens array is set on a convex surface so that the microlens array layer forms a curved structure. Compared with a planar structure, the curved structure allows the optical axis direction of the microlenses in different regions to change naturally, covering a wider viewing angle. Even when viewed from a large side angle (60°), the observer can see a clear and distortion-free stereoscopic image. At the same time, it makes the change of light path more complex, providing a larger amplitude and smoother dynamic effect.

[0008] In some embodiments, the multilayer body further includes a planar microlens array layer disposed on the front plane and a planar micro-image layer disposed on the rear plane. The anti-counterfeiting effect can be improved by using both curved and planar microlens arrays.

[0009] Preferably, the planar micro-graphics are text patterns that provide clear text information; the curved micro-graphics are trademark patterns that provide dynamic effects from multiple perspectives.

[0010] The terms "curved surface" and "plane" mentioned above refer to the fact that the substrate of the microlens array or miniature image is a curved surface or a plane.

[0011] In some embodiments, the multilayer further includes a planar protective layer, which comprises a first plane disposed on the rear plane and a second plane corresponding to the concave surface. The planar protective layer provides a flat back surface for the multilayer, facilitating its integration with anti-counterfeiting packaging materials; it also seals and protects the micrographic layer.

[0012] Preferably, the planar protective layer is an aluminum layer, which also has a reflective effect.

[0013] For microlens array layer The microlens array layer is an array composed of multiple microlenses.

[0014] The shape of the microlens is not limited; it can be square, hexagonal, etc.

[0015] Microlenses can be spherical lenses, aspherical lenses, cylindrical lenses, or prisms. Preferably, the microlens array layer includes several aspherical microlenses. Since the curved substrate layer may cause the distance between the edge microlenses and the miniature image layer to deviate from the focal length, the aspherical microlenses can compensate for off-axis aberrations through the aspherical curvature.

[0016] Because the microlens units in a curved microlens array are arranged along the curved surface, the optical axes of adjacent microlenses diverge. When light is incident at a large angle, the optical paths of different optical channels may intersect, causing the light rays from adjacent channels to overlap on the image plane, resulting in ghosting or halos. Therefore, as a preferred embodiment of this invention, the microlens array layer includes several microlenses, with the center-to-center distance between two adjacent microlenses being p, where p ≥ d + 2R(1-cosα)tanβ; where d is the diameter of the microlens, R is the radius of curvature of the convex surface, α is 4°~6°, β is 30°~60°, and the center-to-center distance refers to the distance from the center of one microlens to the center of another microlens. The meanings are as follows: d is the period when the two microlenses are in close contact; α is the angle between the line connecting the optical centers of adjacent microlenses and the normal to the convex surface, and a value of 4°~6° can balance the large viewing angle and crosstalk suppression; β is the maximum incident angle, and a value of 30°~60° can balance the large viewing angle and the fill factor; R(1-cosα) is the height difference between the optical centers of the two microlenses in the normal direction. Combining this with the maximum incident angle, the spacing increment can be obtained, thus obtaining the period between the two microlenses. By increasing the center-to-center distance between adjacent microlenses, i.e., the period, the overlapping area of ​​the optical path is reduced.

[0017] To form the curved microlens array layer, the material used to form the microlens array layer should be a malleable and curable material with optical transparency; for example, it could be polyurethane, epoxy resin, etc. Preferably, the microlens array layer is a polytert-butyl acrylate microlens array. Polytert-butyl acrylate is a material already in the art.

[0018] For the substrate layer As a preferred embodiment of this invention, the front surface of the substrate layer includes a plurality of convex surfaces, which together form a tactile anti-counterfeiting pattern. By combining the convex surfaces to form a raised anti-counterfeiting pattern, authenticity can be further verified by touch, thus improving the anti-counterfeiting effect through both tactile and visual anti-counterfeiting measures.

[0019] As a preferred embodiment of this invention, the distance between the convex surface and the front plane does not exceed 2mm, so as to control the height of the microlens array layer thereon.

[0020] As a preferred embodiment of this invention, the substrate layer is a cyclic olefin copolymer sheet, a polymethylpentene sheet, or a transparent nylon sheet. Cyclic olefin copolymers, polymethylpentene, and transparent nylon are all materials in the prior art.

[0021] Preferably, the substrate layer is a cyclic olefin copolymer sheet, which is more compatible with the microlens array layer in terms of refractive index.

[0022] For microtext layers The micro-image layer consists of several image units, each of which needs to correspond one-to-one with a microlens and be periodically matched.

[0023] Because the microtext layer is located on a concave surface, pre-distortion processing should be performed during the planar design of the microtext to ensure that the microtext presents a distortion-free three-dimensional effect after being imaged through microlenses on the curved substrate. For example, during planar design, the edge text is pre-stretched and the center text is pre-compressed to compensate for surface distortion; and / or the grayscale of the microtext gradually changes according to the curvature to compensate for the uneven light intensity due to the bright center and dark edges.

[0024] Secondly, another objective of this utility model is to provide a packaging box sheet, which sequentially includes a packaging substrate, an adhesive layer, and the aforementioned multilayer body.

[0025] The packaging substrate is not limited; for example, it can be paper-based, plastic-based, etc.

[0026] The adhesive layer is not limited; for example, it may be at least one of acrylate adhesives, polyurethane acrylate adhesives, metallocene-catalyzed polyolefin hot melt adhesives, and starch adhesives.

[0027] The beneficial effects of this utility model are: 1. This utility model provides a multi-layer body with 3D anti-counterfeiting effect. By setting a microlens array on the convex surface, the microlens array layer forms a curved structure. Compared with the planar structure, the curved structure allows the optical axis direction of the microlenses in different areas to change naturally, covering a wider viewing angle. Even when viewed from a large side angle, the observer can see a clear and distortion-free three-dimensional image. At the same time, it makes the change of light path more complex, providing a larger amplitude and smoother dynamic effect.

[0028] 2. This utility model provides a multi-layered packaging box sheet with 3D anti-counterfeiting effect, which has a good anti-counterfeiting effect. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of one embodiment of a multilayer structure with 3D anti-counterfeiting effect; Figure 2 This is a schematic diagram of another implementation of a multilayer structure with 3D anti-counterfeiting effect; Figure 3 This is a structural diagram of another implementation of a multi-layered structure with 3D anti-counterfeiting effect; Figure 4 This is a structural diagram of one embodiment of a packaging box sheet; In the figure: substrate layer 1, front surface 11, convex surface 111, front plane 112, rear surface 12, concave surface 121, rear plane 122, microlens array layer 2, micro-graphic layer 3, planar protective layer 4, adhesive layer 5, packaging substrate 6. Detailed Implementation

[0030] The following are specific embodiments of the present invention, and the technical solution of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments. Example 1

[0031] A multi-layered structure with 3D anti-counterfeiting effects, such as Figure 1 As shown, the system includes a substrate layer 1, a microlens array layer 2 disposed on the front surface 11 of the substrate layer 1, and a micro-graphic layer 3 disposed on the rear surface 12 of the substrate layer 1. The substrate layer 1 includes raised portions and a flat surface. Several raised portions form a tactile anti-counterfeiting pattern. The front surface of the substrate layer 1 includes a convex surface 111 and a front flat surface 112, and the rear surface 12 includes a concave surface 121 and a rear flat surface 122. The distance from the highest point of the convex surface 111 to the front flat surface 112 is 2 mm, and the radius of the bottom edge of the convex surface 111 is 5 mm. The microlens array layer 2 is disposed on the convex surface 111, and the micro-graphic layer 3 is disposed on the concave surface 121.

[0032] This multilayer body is prepared through the following steps: S1. Select the cyclic olefin copolymer (COC) Apel 5014CL from Mitsui Chemicals of Japan. Feed the COC into a template coated with a release agent, hot press at 200°C, and remove it after cooling to obtain a cyclic olefin copolymer sheet, which serves as the substrate layer 1.

[0033] S2.S21. Obtaining a planar microlens array via photopolymerization: Quartz glass was ultrasonically cleaned sequentially in acetone, ethanol, and deionized water, and then transferred to a three-dimensional displacement platform. A laser with a wavelength of 1030 nm, a repetition frequency of 100 kHz, and a pulse duration of 100 fs was focused onto the surface of the quartz glass through an objective lens (NA=0.75, magnification 40x). The three-dimensional displacement platform was slowly moved at a speed of 0.1 mm / s under program control to prepare a micropore array on the surface of the quartz glass. The micropores were hexagonal with a diameter of 40 μm, and the center-to-center distance between adjacent micropores was 105 μm (α = 5°, β = 60°). The surface of the quartz glass was then ultrasonically cleaned and etched in 20% HF for 30 min to form smooth pits, thus obtaining a quartz template.

[0034] According to the mass ratio, 80 parts of tert-butyl acrylate, 20 parts of aliphatic polyurethane diacrylate, and 2 parts of TPO were stirred in the dark for 2 hours to obtain the precursor.

[0035] The precursor was dropped onto a quartz template and irradiated with ultraviolet light for 2 minutes to complete the polymerization and curing of the precursor. Then, the planar polytert-butyl acrylate microlens array cured on the quartz template was peeled off in hot water at 80°C.

[0036] S22. Prepare a pressing template, which includes a through hole through which the convex surface 111 of the substrate layer 1 can pass, and a pressing surface that can be fitted with the front plane 112 of the substrate layer 1.

[0037] S23. In an environment of 80℃, a softened planar microlens array is laid between the front surface 11 of the substrate layer 1 and the pressing template. The microlens array is plasticized by the extrusion action of the substrate layer 1 and the pressing template. After maintaining the extrusion state for 30 minutes, it is cooled to room temperature, and the pressing template is peeled off to obtain the substrate layer 1 with a convex surface 111 and a curved surface of the microlens array layer 2.

[0038] S3. Preparation of micro-image templates according to existing technology: A silicon wafer is used as the substrate. The silicon wafer is first cleaned and then baked in an oven at 180°C for 4 hours to remove surface water molecules. A 2μm thick titanium film is formed on the surface of the silicon wafer using a sputtering machine. A 40μm thick photoresist is then coated onto the titanium film surface and dried to obtain a conductive substrate with a photoresist coating. Micro-image structures are formed on the photoresist coating, wherein the micro-images undergo pre-distortion processing, edge stretching, and center compression; then exposure is performed using an exposure machine with an optical power of 20mJ / cm². 2 The exposure time was 30 seconds. After exposure, the photoresist underwent post-baking, held at 65°C for 25 minutes, then rapidly increased to 95°C and held for 10 minutes. The photoresist was then developed for 8 minutes using a matching developer to obtain a micro-image structure. The conductive layer in areas without the micro-image structure was exposed, forming an island-like structure. The obtained conductive substrate with the island-like micro-image structure was placed in an electrolyte solution, with the conductive substrate as the cathode and nickel as the anode, for micro-electroforming. A nickel layer was formed in the gaps of the island-like micro-image structure, with its height less than the thickness of the photoresist layer, approximately 90% of the photoresist layer thickness. After electroforming, the nickel layer was peeled off from the conductive substrate, and the photoresist was washed away, yielding a nickel plate with a hollowed-out micro-image structure.

[0039] A nickel plate with a hollowed-out micro-graphic structure is covered on the surface of an elastic transfer plate, and an elastic transfer plate with micro-graphics is obtained by inkjet printing.

[0040] Prepare a transfer mold, which is equipped with a transfer module that is compatible with the concave surface 121 of the substrate layer 1.

[0041] With the assistance of laser positioning, an elastic transfer plate with micro-images is attached and fixed between the transfer module and the concave surface 121 of the substrate layer 1 to transfer the micro-images to the concave surface 121, thereby obtaining a multilayer body. Example 2

[0042] This embodiment is basically the same as Embodiment 1, except that: Figure 2 As shown, it also includes a planar protective layer 4, which is an aluminum foil, including a first plane bonded to the rear plane 122 of the substrate layer 1 by ADMER QF460E adhesive, and a second plane located below the concave surface 121. Example 3

[0043] This embodiment is basically the same as Embodiment 1, except that: Figure 3 As shown, it also includes a planar microlens array layer disposed on the front plane 112 and a planar micro-image layer disposed on the rear plane 112.

[0044] This multilayer body is prepared through the following steps: S1. The cyclic olefin copolymer sheet from Example 1 is selected as the substrate layer 1.

[0045] S2.S21. The planar polytert-butyl acrylate microlens array prepared in Example 1 is selected.

[0046] S22. Prepare a pressing template, which includes a through hole through which the convex surface 111 of the substrate layer 1 can pass, and a pressing surface that can be fitted with the front plane 112 of the substrate layer 1; wherein the pressing surface has an opening, so that the pressing surface includes an opening and a pressing portion.

[0047] S23. In an environment of 80℃, a softened planar microlens array is laid between the front surface 11 of the substrate layer 1 and the pressing template. The microlens array is plasticized by the extrusion action of the substrate layer 1 and the pressing template. After maintaining the extrusion state for 30 minutes, it is cooled to room temperature, and the pressing template is peeled off. The portion corresponding to the through hole of the pressing template forms the microlens array layer 2, and the portion corresponding to the opening of the pressing template forms the planar microlens array layer.

[0048] S3. A nickel plate with a hollowed-out micro-graphic structure is produced in the same manner as in Example 1, wherein the micro-graphic structure includes a pre-distorted pattern structure and a normal text structure.

[0049] A nickel plate with a hollowed-out micro-graphic structure is covered on the surface of an elastic transfer plate, and an elastic transfer plate with micro-graphics is obtained by inkjet printing.

[0050] Prepare a transfer mold, which includes a transfer module adapted to the concave surface 121 of the substrate layer 1 and a transfer surface adapted to the rear plane 122 of the substrate layer 1.

[0051] With the assistance of laser positioning, an elastic transfer plate with micro-images is attached and fixed between the transfer mold and the back surface 12 of the substrate layer 1. The pattern structure in the elastic transfer plate, which has undergone pre-distortion processing, corresponds to the concave surface 121 and the transfer module, and the normal text structure corresponds to the back plane 122 and the transfer surface, so as to transfer the micro-images to the concave surface 121 and the back plane 122, thereby obtaining the micro-image layer 3 and the planar micro-image layer, thus obtaining a multilayer body.

[0052] Application Example 1 A type of packaging box, such as Figure 4 As shown, the structure includes, from bottom to top, a packaging substrate 6, an adhesive layer 5, and the multilayer body prepared in Example 2.

[0053] This packaging box is prepared by the following steps: applying a UV-curable polyurethane acrylate adhesive to the planar protective layer 4 of the multilayer body, then laminating it with the packaging substrate 6, and curing it under UV light.

[0054] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A multilayer body with 3D anti-counterfeiting effect, comprising a substrate layer (1), a microlens array layer (2) disposed on the front surface (11) of the substrate layer (1), and a micro-graphic layer (3) disposed on the rear surface (12) of the substrate layer (1), characterized in that: The substrate layer (1) includes a protrusion and a planar surface, such that the front surface (11) of the substrate layer (1) includes a convex surface (111) and a front planar surface (112), and the rear surface (12) of the substrate layer (1) includes a concave surface (121) and a rear planar surface (122). The microlens array layer (2) is disposed on the convex surface (111), and the micro-graphic layer (3) is disposed on the concave surface (121).

2. A multi-layered structure with 3D anti-counterfeiting effect according to claim 1, characterized in that: The front surface (11) of the substrate layer (1) includes a plurality of convex surfaces (111), which together form a tactile anti-counterfeiting pattern.

3. A multi-layered structure with 3D anti-counterfeiting effect according to claim 1, characterized in that: The multilayer body also includes a planar microlens array layer disposed on the front plane (111) and a planar micro-image layer disposed on the rear plane (112).

4. A multi-layered structure with 3D anti-counterfeiting effect according to claim 1, characterized in that: The microlens array layer (2) includes several microlenses, with the center distance between two adjacent microlenses being p, p≥d+2R(1-cosα)tanβ; where d is the diameter of the microlens, R is the radius of curvature of the convex surface (111), α is 4°~6°, and β is 30°~60°.

5. A multi-layered structure with 3D anti-counterfeiting effect according to claim 4, characterized in that: The microlens is quadrilateral or hexagonal.

6. A multi-layered structure with 3D anti-counterfeiting effect according to claim 1, characterized in that: The microlens array layer (2) is a polytert-butyl acrylate microlens array.

7. A multi-layered structure with 3D anti-counterfeiting effect according to claim 1, characterized in that: The substrate layer (1) is a cyclic olefin copolymer sheet, a polymethylpentene sheet, or a transparent nylon sheet.

8. A multi-layered structure with 3D anti-counterfeiting effect according to claim 1, characterized in that: The multilayer body further includes a planar protective layer (4), which includes a first plane disposed on the rear plane (122) and a second plane corresponding to the concave surface.

9. A multi-layered structure with 3D anti-counterfeiting effect according to claim 8, characterized in that: The planar protective layer (4) is an aluminum layer.

10. A packaging box sheet, characterized in that: It comprises, in sequence, a packaging substrate (6), an adhesive layer (5), and a multilayer body as described in any one of claims 1 to 9.

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