Certificate anti-counterfeiting film structure

Abstract

The utility model provides a certificate anti-counterfeiting film structure, and relates to the technical field of certificate anti-counterfeiting. The certificate anti-counterfeiting film structure comprises a base film layer, a bonding layer, a micro-nano structure layer, a reflection enhancement layer, a reinforced protection layer and a cross-linking layer, at least one micro-nano structure layer with a preset shape is connected with the base film layer through a bonding layer; the reflection enhancement layer covers the pattern of the micro-nano structure layer; the reinforced protection layer covers the reflection enhancement layer; according to the scheme, in the aspect of printing precision, the problems of low conventional printing precision or incomplete coverage and the like are solved, meanwhile, the appearance effect is improved, the manufacturing difficulty is improved, and the anti-counterfeiting grade is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of document anti-counterfeiting technology, specifically to a document anti-counterfeiting film structure. Background Technology

[0002] Laser holographic anti-counterfeiting film has rich optical dynamic change effects and is one of the conventional anti-counterfeiting methods on certificates. It is used to protect the personal information of certificate holders, prevent them from being forged, altered or tampered with, and improve the overall anti-counterfeiting technology level of certificates.

[0003] Commonly used laser holographic anti-counterfeiting films are prone to problems such as bubbling, delamination, surface peeling, and wear and powdering in document applications, severely affecting their usability and failing to meet the requirements for long-life security documents. For example, the patch coating process typically uses adhesives to bond the laser holographic anti-counterfeiting film to the card body. Over time and with changes in the environment, the adhesive strength is easily affected by various external environmental and usage factors, and there is a possibility of peeling or detachment. The thin coating transferred to the card surface in the overlay process is also easily worn, thus affecting its service life.

[0004] Furthermore, the hot stamping process for creating holographic anti-counterfeiting patterns is limited by the hot stamping mold, which can only produce anti-counterfeiting patterns with simple shapes. It is impossible to produce more intricate and complex patterns, thus affecting both the visual effect and the level of anti-counterfeiting. Utility Model Content

[0005] The purpose of this utility model is to provide a document anti-counterfeiting film structure, which has the characteristics of strong bonding with the card body and flexible and designable patterns, thereby enhancing the overall anti-counterfeiting level of the document.

[0006] Based on the above objectives, in a first aspect, this application provides an anti-counterfeiting film structure for identification documents, comprising a base film layer, an adhesive layer, a micro / nano structure layer, a reflective enhancement layer, a reinforcing protective layer, and a cross-linking layer;

[0007] At least one micro / nano structure layer of a predetermined shape is connected to the base film layer via an adhesive layer;

[0008] The reflection enhancement layer covers the pattern of the micro / nano structure layer;

[0009] The reinforced protective layer covers the reflection enhancement layer;

[0010] The cross-linked layer fully covers the reinforcing protective layer and the base film layer.

[0011] Furthermore, the base film layer is made of PET, PC or PETG material, with a thickness ranging from 50 to 200 μm.

[0012] Furthermore, the crosslinking layer material is PE or EVA hot melt adhesive, with a thickness ranging from 10-30 μm.

[0013] Furthermore, the adhesive layer is made of water-based polyurethane with a thickness ranging from 0.1 to 2 μm.

[0014] Furthermore, the reflection enhancement layer is made of a metal or metal compound having a preset refractive index or reflectivity, including aluminum, chromium, zinc and their oxides.

[0015] Furthermore, the reflection enhancement layer includes a first reflection enhancement layer and / or a second reflection enhancement layer;

[0016] The first reflection enhancement layer is configured to be opaque.

[0017] The second reflection enhancement layer is configured to be transparent or semi-transparent.

[0018] Furthermore,

[0019] The thickness of the first reflection enhancement layer is 150-500 angstroms;

[0020] The thickness of the second reflective enhancement layer is 150-500 angstroms.

[0021] Furthermore, the reinforced protective layer uses UV ink and has a thickness ranging from 1 to 10 μm.

[0022] By adopting the above technical solution, the anti-counterfeiting film structure for documents provided in this application has the following technical advantages compared to existing technologies:

[0023] At least one micro / nano structure layer of a predetermined shape is connected to a base film layer via an adhesive layer. A reflection enhancement layer covers the pattern of the micro / nano structure layer, a reinforcing protective layer covers the reflection enhancement layer, and a cross-linking layer fully covers the reinforcing protective layer and the base film layer. The base film layer primarily serves as the overall structural support and, after the anti-counterfeiting film is combined with the card body, protects the card information and anti-counterfeiting pattern. The adhesive layer is used to fix the micro / nano structure layer onto the base film layer. The micro / nano structure layer is a micro / nano optical structure for anti-counterfeiting achieved through high-precision holographic lithography, capable of zero-order diffraction light variation. The reflection enhancement layer enhances the macroscopic diffraction effect of the micro / nano optical structure, making it easier to identify. The reinforcing protective layer is a protective measure to further protect the micro / nano optical structure from deformation and cracking during high-temperature and high-pressure processes; it possesses high hardness and high-temperature resistance. This solution, especially in terms of printing accuracy, solves the problems of low printing accuracy or incomplete coverage found in conventional printing methods, while also improving the appearance, increasing the manufacturing difficulty, and enhancing the anti-counterfeiting level. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the anti-counterfeiting film structure for documents provided in the embodiments of this application.

[0026] Icons: 1-Base film layer; 2-Adhesive layer; 3-Micro / nano structure layer; 4-Reflection enhancement layer; 41-First reflection enhancement layer; 42-Second reflection enhancement layer; 5-Reinforced protective layer; 6-Crosslinking layer. Detailed Implementation

[0027] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] like Figure 1 As shown in the figure, an anti-counterfeiting film structure for identification documents provided in this application includes a base film layer 1, an adhesive layer 2, a micro / nano structure layer 3, a reflective enhancement layer 4, a reinforcing protective layer 5, and a cross-linking layer 6.

[0031] In this structure, at least one micro / nano structure layer 3 of a predetermined shape is connected to the base film layer 1 through an adhesive layer 2; a reflection enhancement layer 4 covers the pattern of the micro / nano structure layer 3; and a reinforcement protective layer 5 covers the reflection enhancement layer 4.

[0032] The cross-linked layer 6 fully covers the reinforced protective layer 5 and the base film layer 1.

[0033] In this embodiment, the base film layer 1 mainly serves as the overall structural support, and after the anti-counterfeiting film is combined with the card body, it can protect the card surface information and anti-counterfeiting pattern. The thickness ranges from 50-200um, and there are various materials, including but not limited to PET, PC, PETG, etc. It can be combined with the card body of the same material through processes such as welding, so there is no need to apply adhesive.

[0034] The cross-linked layer 6 is made of hot melt adhesive such as PE and EVA, with a thickness of 10-30um. It mainly serves to connect the anti-counterfeiting film to the card body. It softens at high temperature and deforms under pressure, embedding itself into the fine structure of the card body surface. After cooling and setting, it cannot be separated, thus forming an interactive connection with the card body.

[0035] The adhesive layer 2 is made of water-based polyurethane primer with a thickness of 0.1-2 μm. Besides its adhesive function, it also serves a leveling function (if the surface of the base film layer 1 is matte). Its purpose is to fix the micro / nano structure layer 3 onto the base film layer 1. The areas where the micro / nano optical structure needs to be loaded are pre-loaded onto the base film using a printing method, and then the micro / nano structure layer 3 is transferred to the adhesive layer 2. It is then cured and set using methods such as heating or light radiation.

[0036] The third micro / nano structure is a micro / nano optical structure used for anti-counterfeiting, achieved through high-precision holographic lithography. Its minimum structural size is less than 380 nm per line pair, enabling zero-order diffraction optical variation. This micro / nano structure is transferred and shaped onto a pre-set specific ink layer via UV curing or hot pressing.

[0037] The reflection enhancement layer 4 is made of a metal or metal compound with a preset refractive index or reflectivity, including but not limited to aluminum, chromium, zinc and their oxides.

[0038] The reflection enhancement layer 4 includes a first reflection enhancement layer 41 and / or a second reflection enhancement layer 42.

[0039] The first reflection enhancement layer 41 is configured to be opaque to enhance the macroscopic diffraction effect of the micro / nano optical structure, making it easier to identify. It employs metals or metal compounds with specific refractive indices or reflectivities, including but not limited to aluminum, chromium, zinc, and their oxides, etc., achieved through vacuum evaporation, magnetron sputtering, or chemical deposition. The coating thickness must be strictly controlled to obtain the correct reflection or diffraction efficiency, typically between 150 and 500 angstroms.

[0040] The second reflective enhancement layer 42 is configured to be transparent or semi-transparent to achieve high light transmittance, ensuring effective readability of document information, and also enabling more special light-changing effects. It is generally between 150-500 angstroms, utilizing semi-transparent sulfides.

[0041] In practical applications, either the first reflective enhancement layer 4 or the second reflective enhancement layer 4 can be flexibly selected according to the different patterns displayed on the anti-counterfeiting film. It is important to emphasize that either the first reflective enhancement layer 4 or the second reflective enhancement layer 4 can be configured into a specific shape or area as needed. In other words, different coating and aluminum washing processes can be selected based on the material type to achieve a specific aluminum washing appearance.

[0042] The reinforcing protective layer 5 is typically made of UV ink, with a thickness of 1-10 μm (UV ink has high temperature resistance after curing, and the use of long-chain resin increases its toughness and makes it less prone to deformation during subsequent printing). This is a protective measure to further protect the micro / nano structure layer 3 from deformation and cracking during high-temperature and high-pressure processes. It possesses high hardness and high-temperature resistance. In existing hot stamping processes, due to the lack of protection for the micro / nano optical structure, the structure is prone to deformation or damage during the hot stamping process, resulting in reduced brightness and loss of gloss in the printed pattern. This reinforcing protective layer 5 is added in this embodiment to prevent such phenomena.

[0043] The manufacturing process for producing the aforementioned anti-counterfeiting film structure for identification documents includes the following steps:

[0044] Step 1: Select a roll-type base film layer. In order to improve the adhesion between the coating and the base film layer 1, an adhesive layer 2 is usually printed on the surface of the base film layer 1 first. The thickness of the adhesive layer 2 is 0.5-1um.

[0045] Step 2: Heat stamp or print the micro-nano structure layer 3 on the adhesive layer 2, wherein the holographic pattern of the micro-nano structure layer 3 can be fully displayed; in order to maintain the long life of the document, it is recommended to use a partial pattern for this pattern;

[0046] Step 3: Overprint a water-based coating layer on the non-holographic pattern area outside the holographic pattern on the micro / nano structure layer 3. The water-based coating layer generally uses water-based water-soluble coating to achieve complete coverage of the non-holographic pattern area; the intaglio pattern is the negative image of the final pattern to be presented, and the thickness of the water-based coating is 2-10um.

[0047] Step 4: Vacuum deposit a reflection enhancement layer 4 on the water-based coating layer and the micro / nano structure layer 3. The reflection enhancement layer 4 is generally made of aluminum, tin, zirconium sulfide, zinc sulfide, etc., and the thickness of the reflection layer is 100-600 angstroms.

[0048] Step 5: After passing through a high-precision water washing machine, the water-based coating layer and the reflective enhancement layer 4 on the water-based coating layer are removed and dissolved in water, while the areas on the micro-nano structure layer 3 where the water-based coating layer is not printed are retained.

[0049] Step 6: On the micro-nano structure layer 3, the reflection enhancement layer 4 of the holographic pattern and the non-holographic pattern area are gravure or screen-printed to form a reinforcement and protective layer 5. The reinforcement and protective layer 5 is made of UV ink to prevent the pattern from being cracked during the subsequent card making process. The thickness is 3-5 μm and it is dried by UV irradiation.

[0050] Step 7: Apply cross-linking layer 6 to the reinforced protective layer 5. The cross-linking layer 6 uses PE and EVA hot melt adhesive with a thickness of 20-30um, so that the adhesive layer can bond the film and the card body together.

[0051] Step 8: The roll of film is cut into individual sheets according to the water-washed printing mark. The individual sheets contain laser holographic anti-counterfeiting film that can be used to make long-life ID cards.

[0052] The document anti-counterfeiting film structure manufactured by the above process in this application, compared with the existing technology, especially in terms of printing precision, solves the problems of low printing precision or incomplete coverage in conventional printing, while also improving the appearance, increasing the manufacturing difficulty, and enhancing the anti-counterfeiting level.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A document security film structure, characterized by, The base film layer, the adhesive layer, the micro-nano structure layer, the reflection enhancement layer, the reinforced protective layer and the cross-linking layer are included. At least one micro-nano structure layer with a preset shape is connected to the base film layer through the adhesive layer. The reflection enhancement layer covers the pattern of the micro-nano structure layer. The reinforced protective layer covers the reflection enhancement layer. The cross-linking layer covers the reinforced protective layer and the base film layer.

2. The document security film structure of claim 1, wherein, The base film layer is made of PET, PC or PETG material, and the thickness ranges from 50 to 200 um.

3. The document security film structure of claim 1, wherein, The cross-linking layer material is PE or EVA hot melt adhesive, and the thickness ranges from 10 to 30 um.

4. The document security film structure of claim 3, wherein, The adhesive layer is water-based polyurethane, and the thickness ranges from 0.1 to 2 um.

5. The document security film structure of claim 1, wherein, The reflection enhancement layer is made of metal or metal compound with a preset refractive index or reflectivity, including aluminum, chromium, zinc and their oxides.

6. The document security film structure of claim 5, wherein, The reflection enhancement layer includes a first reflection enhancement layer and / or a second reflection enhancement layer. The first reflection enhancement layer is configured to be opaque. The second reflection enhancement layer is configured to be transparent or translucent.

7. The certificate security film structure of claim 6, wherein: The thickness of the first reflection enhancement layer is 150-500 angstroms. The thickness of the second reflection enhancement layer is 150-500 angstroms.

8. The document security film structure of claim 1, wherein, The reinforced protective layer is made of UV ink, and the thickness ranges from 1 to 10 um.

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