Certificate anti-counterfeiting film structure and manufacturing process thereof

Abstract

The invention provides a certificate anti-counterfeiting film structure and a manufacturing process thereof, 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] The invention relates to the technical field of document anti-counterfeiting, and in particular to a document anti-counterfeiting film structure and a manufacturing process thereof. Background Art

[0002] Laser holographic anti-counterfeiting film has rich optical dynamic change effects and is one of the conventional anti-counterfeiting means on certificates. It is used to protect the personal information of certificate holders, prevent forgery, alteration or tampering, and improve the overall anti-counterfeiting technology level of certificates.

[0003] The general laser holographic anti-counterfeiting film is prone to blistering, delamination, surface shedding, wear and powdering in the application of documents, which seriously affects the use and is difficult to meet the requirements of long-life security documents. For example, the PATCH surface lamination process generally uses adhesives to bond the laser holographic anti-counterfeiting film to the card body. As time and environment change, the bonding force of the adhesive is easily affected by various external environments and usage factors, and there is a possibility of peeling and falling off. The thin layer of coating transferred on the surface of the card body by the OVERLAY lamination process is also easily worn, thus affecting its service life.

[0004] Furthermore, due to the limitation of the hot stamping mold, the holographic anti-counterfeiting patterns produced through the hot stamping process can only produce anti-counterfeiting patterns with simple shapes, and cannot produce more delicate and complex pattern shapes, which affects the visual effect and anti-counterfeiting level. Summary of the invention

[0005] The purpose of the present invention is to provide an anti-counterfeiting film structure for a certificate and a manufacturing process thereof, which has the characteristics of strong bonding with a card body and flexible and designable patterns, thereby enhancing the overall anti-counterfeiting level of the certificate.

[0006] Based on the above purpose, in a first aspect, the present application provides a document anti-counterfeiting film structure, including a base film layer, an adhesive layer, a micro-nano structure layer, a reflection enhancement layer, a strengthening protection layer and a cross-linking layer;

[0007] At least one micro-nano structure layer of a preset shape is connected to the base film layer through a bonding layer;

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

[0009] The strengthening protection layer covers the reflection enhancing layer;

[0010] The cross-linked layer completely covers the reinforced protective layer and the base film layer.

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

[0012] Furthermore, the cross-linking layer material is made of PE or EVA hot melt adhesive with a thickness ranging from 10 to 30 um.

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

[0014] Furthermore, the reflection enhancement layer is made of metal or metal compound with a preset refractive index or reflectivity, including but not limited to aluminum, chromium, zinc and oxides thereof.

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

[0016] Wherein, the first reflection enhancement layer is configured to be opaque;

[0017] The second reflection enhancing layer is configured to be transparent or translucent.

[0018] Further,

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

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

[0021] Furthermore, the reinforced protective layer is made of UV ink with a thickness ranging from 1 to 10 um.

[0022] In a second aspect, the present application provides a manufacturing process for an anti-counterfeiting film structure for a certificate, which is used to manufacture the above-mentioned anti-counterfeiting film structure for a certificate. The manufacturing process comprises the following steps:

[0023] Step 1: Select a roll base film layer and print an adhesive layer on the base film surface with a thickness of 0.5-1um;

[0024] Step 2: hot stamping or printing the micro-nano structure layer on the adhesive layer, wherein the holographic pattern of the micro-nano structure layer can be fully presented;

[0025] Step 3: overprinting a water-based coating layer on the non-holographic pattern area outside the holographic pattern on the micro-nano structure layer to achieve complete coverage of the non-holographic pattern area;

[0026] Step 4: vacuum depositing a reflection enhancement layer on the water-based coating layer and the micro-nano structure layer, wherein the thickness of the reflection layer is 100-600 angstroms;

[0027] Step 5: After being washed by a high-precision water washing machine, the water-based coating layer and the reflection enhancement layer on the water-based coating layer are removed and dissolved in water, and the area on the micro-nano structure layer where the water-based coating layer is not printed is retained;

[0028] Step 6: Gravure or silk-screen a reinforced protective layer on the holographic pattern reflection enhancement layer and the non-holographic pattern area on the micro-nano structure layer. The reinforced protective layer is made of UV ink with a thickness of 3-5um and dried by ultraviolet light;

[0029] Step 7: A cross-linking layer is coated on the reinforced protective layer. The cross-linking layer 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.

[0030] Furthermore, the thickness of the water-based coating layer is 2-10 um.

[0031] By adopting the above technical solution, the document anti-counterfeiting film structure and manufacturing process provided by this application have the following technical effects compared with the prior art:

[0032] At least one micro-nano structure layer of a preset shape is connected to the base film layer through an adhesive layer, the reflection enhancement layer covers the pattern of the micro-nano structure layer, the strengthening protection layer covers the reflection enhancement layer, and the cross-linking layer fully covers the strengthening protection layer and the base film layer; wherein the base film layer mainly plays the role of overall structural support, and at the same time, after the anti-counterfeiting film is combined with the card body, it can protect the card surface information and anti-counterfeiting pattern. The purpose of the adhesive layer is to fix the micro-nano structure layer on the base film layer. The micro-nano structure layer is a micro-nano optical structure with an anti-counterfeiting effect achieved by a high-precision holographic lithography process, which can achieve a zero-order diffraction light-variable effect. The reflection enhancement layer is used to enhance the macroscopic diffraction effect of the micro-nano optical structure, making it easier to identify. The strengthening protection layer is a protective measure taken to further protect the micro-nano optical structure from deformation and cracking in a high-temperature and high-pressure process. It has high hardness and high-temperature resistance. This solution, especially in terms of printing accuracy, solves the problems of low conventional printing accuracy or incomplete coverage, and also improves the appearance effect, increases the difficulty of production, and enhances the anti-counterfeiting level. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 is a schematic diagram of the certificate anti-counterfeiting film structure provided in an embodiment of the present application;

[0035] Figure 2 It is an anti-counterfeiting pattern made by the traditional hot stamping process in the prior art;

[0036] Figure 3 It is an anti-counterfeiting pattern formed by the manufacturing process of the present application.

[0037] Icon: 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-strengthening protective layer; 6-cross-linking layer. DETAILED DESCRIPTION

[0038] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] like Figure 1 As shown, an anti-counterfeiting film structure for a certificate provided in an embodiment of the present application includes a base film layer 1, an adhesive layer 2, a micro-nano structure layer 3, a reflection enhancement layer 4, a strengthening protection layer 5 and a cross-linking layer 6;

[0042] Among them, at least one micro-nano structure layer 3 of a preset shape is connected to the base film layer 1 through the adhesive layer 2; the reflection enhancement layer 4 covers the pattern of the micro-nano structure layer 3; the strengthening protection layer 5 covers the reflection enhancement layer 4;

[0043] The cross-linked layer 6 completely covers the reinforced protective layer 5 and the base film layer 1 .

[0044] In this embodiment, the base film layer 1 mainly plays the role of overall structural support, and at the same time, after the anti-counterfeiting film is combined with the card body, it can protect the card surface information and anti-counterfeiting pattern. The thickness range is generally 50-200um, and there are many materials, including but not limited to PET, PC, PETG, etc. It can be combined with the card body of the same material through welding and other processes, so there is no need to apply adhesive.

[0045] The cross-linking layer 6 is made of hot melt adhesive such as PE and EVA with a thickness of 10-30um. It mainly connects the anti-counterfeiting film as a whole with the card body. It softens at high temperatures, and under pressure, its surface structure deforms and is embedded in the fine structure of the card body surface. After cooling and shaping, it cannot be separated, thus forming an interactive connection with the card body.

[0046] The material of the bonding layer 2 is a water-based polyurethane primer with a thickness of 0.1-2um. In addition to the bonding function, it also has a filling function (if the surface of the base film layer 1 is matte), and the purpose is to fix the micro-nano structure layer 3 on the base film layer 1. The area where the micro-nano optical structure needs to be loaded is loaded on the base film in advance by printing, and then the micro-nano structure layer 3 is transferred to the bonding layer 2. It is hardened and fixed by heating or light wave radiation.

[0047] The micro-nano structure layer 3 is a micro-nano optical structure with anti-counterfeiting effect achieved through high-precision holographic lithography, with a minimum structure size of less than 380nm / line pair, which can achieve zero-order diffraction optical variable effect. The micro-nano structure is transferred and shaped on a pre-set specific ink by UV curing or hot pressing.

[0048] The reflection enhancing layer 4 is made of metal or metal compound with a preset refractive index or reflectivity, including but not limited to aluminum, chromium, zinc and oxides thereof.

[0049] The reflection enhancement layer 4 includes a first reflection enhancement layer 41 and / or a second reflection enhancement layer 42.

[0050] The first reflection enhancement layer 41 is configured to be opaque, which enhances the macroscopic diffraction effect of the micro-nano optical structure and makes it easier to identify. Metals or metal compounds with specific refractive index or reflectivity, including but not limited to aluminum, chromium, zinc and their oxides, etc., are used, and are realized by vacuum evaporation or magnetron sputtering or chemical plating. The thickness of the coating needs to be strictly controlled to obtain the correct reflection or diffraction efficiency, which is generally between 150-500 angstroms.

[0051] The second reflection enhancement layer 42 is configured to be transparent or semi-transparent to obtain a higher light transmittance, ensure effective reading of the document information, and also achieve more special light-changing effects. Generally, the transmittance is between 150-500 angstroms, and semi-transparent sulfide is used.

[0052] In practical applications, the first reflection enhancement layer 4 or the second reflection enhancement layer 4 can be flexibly selected according to the needs of displaying different patterns of the anti-counterfeiting film. It should be emphasized that the first reflection enhancement layer 4 or the second reflection enhancement layer 4 can be set to a specific shape or area as needed. In other words, different coating and aluminum washing processes can be selected according to the material type to achieve a specific aluminum washing appearance.

[0053] The material of the reinforced protective layer 5 is generally UV ink with a thickness of 1-10um (UV ink has a high temperature resistance after curing, and the long-chain resin is used to increase its toughness and is not easy to deform in the later embossing). It is a protective measure taken to further protect the micro-nano structure layer 3 from deformation and cracking in the high temperature and high pressure process. It has high hardness and high temperature resistance. In the hot stamping process of the prior art, due to the lack of protection for the micro-nano optical structure, the micro-nano optical structure is easily deformed or damaged during the hot stamping process, resulting in the phenomenon of reduced brightness and loss of gloss of the pattern after hot stamping. In this embodiment, the reinforced protective layer 5 is specially added to prevent such phenomenon from occurring.

[0054] The present embodiment provides a manufacturing process for an anti-counterfeiting film structure for a certificate, which is used to manufacture the above-mentioned anti-counterfeiting film structure for a certificate. The manufacturing process comprises the following steps:

[0055] Step 1: Select a roll base film layer. In order to improve the bonding strength between the coating and the base film layer 1, an adhesive layer 2 is generally printed on the surface of the base film layer 1. The thickness of the adhesive layer 2 is 0.5-1um;

[0056] Step 2: hot stamping or printing 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 presented; in order to maintain the long life of the document, it is recommended to use a local pattern;

[0057] Step 3: overprinting 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 adopts a water-based water-soluble coating to achieve complete coverage of the non-holographic pattern area. The holographic pattern on the micro-nano structure layer 3 can be a display pattern that can be seen intuitively, and the gravure pattern is a negative image of the pattern that needs to be presented in the end. The thickness of the water-based coating is 2-10um.

[0058] Step 4: vacuum depositing 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;

[0059] Step 5: After being washed by a high-precision water washing machine, the water-based coating layer and the reflection enhancement layer 4 on the water-based coating layer are removed and dissolved in water, and the area on the micro-nano structure layer 3 where the water-based coating layer is not printed is retained;

[0060] Step 6: Gravure or silk-screen the holographic pattern reflection enhancement layer 4 and the non-holographic pattern area on the micro-nano structure layer 3 to strengthen the protective layer 5. The strengthening protective layer 5 uses UV ink to prevent the material from being crushed during the subsequent card making process. The thickness is 3-5um and it is dried by ultraviolet light.

[0061] Step 7: A cross-linking layer 6 is coated on the strengthening protection layer 5. The cross-linking layer 6 is made of PE or EVA hot melt adhesive with a thickness of 20-30 um, so that the adhesive layer can bond the film and the card body together.

[0062] Step 8: The roll film is cut into single sheets according to the water-washed printed labels. The single sheets contain the laser holographic anti-counterfeiting film and can be used to make long-life ID cards.

[0063] Figure 2 The anti-counterfeiting pattern made by the traditional hot stamping process in the prior art is shown; Figure 2 As shown, when manufacturing circular patterns and polygonal patterns, hot stamping molds of corresponding shapes are required. Due to the limitations of the hot stamping molds, only anti-counterfeiting patterns with simple shapes can be produced, and more sophisticated and complex pattern shapes cannot be produced, which affects the visual effect and anti-counterfeiting level.

[0064] Figure 3 To form an anti-counterfeiting pattern using the manufacturing process of this application, Figure 3 It can be seen that this solution has obvious advantages in the application of certificate production. It can not only meet the service life of long-term certificates, but also take into account anti-counterfeiting and appearance.

[0065] To sum up, compared with the prior art, the document anti-counterfeiting film structure manufactured by the present application through the above-mentioned process solves the problems of low conventional printing accuracy or incomplete coverage, especially in terms of printing accuracy. At the same time, it also improves the appearance effect, increases the production difficulty, and enhances the anti-counterfeiting level.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A document anti-counterfeiting film structure, characterized in that: It includes a base film layer, an adhesive layer, a micro-nano structure layer, a reflection enhancement layer, a strengthening protection layer and a cross-linking layer; At least one micro-nano structure layer of a preset shape is connected to the base film layer through a bonding layer; The reflection enhancement layer covers the pattern of the micro-nano structure layer; The strengthening protection layer covers the reflection enhancing layer; The cross-linked layer completely covers the reinforced protective layer and the base film layer.

2. The document anti-counterfeiting film structure according to claim 1, characterized in that: The base film layer is made of PET, PC or PETG, and has a thickness ranging from 50 to 200 um.

3. The document anti-counterfeiting film structure according to claim 1, characterized in that: The cross-linking layer material is PE or EVA hot melt adhesive with a thickness ranging from 10 to 30 um.

4. The document anti-counterfeiting film structure according to claim 3, characterized in that: The bonding layer is made of water-based polyurethane and has a thickness ranging from 0.1 to 2 um.

5. The document anti-counterfeiting film structure according to claim 1, characterized in that: The reflection enhancement layer is made of metal or metal compound with a preset refractive index or reflectivity, including but not limited to aluminum, chromium, zinc and oxides thereof.

6. The document anti-counterfeiting film structure according to claim 5, characterized in that: The reflection enhancing layer includes a first reflection enhancing layer and / or a second reflection enhancing layer, Wherein, the first reflection enhancement layer is configured to be opaque; The second reflection enhancing layer is configured to be transparent or translucent.

7. The document anti-counterfeiting film structure according to claim 6, characterized in that: 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 anti-counterfeiting film structure according to claim 1, characterized in that: The reinforced protective layer is made of UV ink with a thickness ranging from 1 to 10 um.

9. A process for manufacturing an anti-counterfeiting film structure for a certificate, used for manufacturing the anti-counterfeiting film structure for a certificate according to any one of claims 1 to 8, characterized in that: The steps include: Step 1: Select a roll base film layer and print an adhesive layer on the base film surface with a thickness of 0.5-1um; Step 2: hot stamping or printing the micro-nano structure layer on the adhesive layer, wherein the holographic pattern of the micro-nano structure layer can be fully presented; Step 3: overprinting a water-based coating layer on the non-holographic pattern area outside the holographic pattern on the micro-nano structure layer to achieve complete coverage of the non-holographic pattern area; Step 4: vacuum depositing a reflection enhancement layer on the water-based coating layer and the micro-nano structure layer, wherein the thickness of the reflection layer is 100-600 angstroms; Step 5: After being washed by a high-precision water washing machine, the water-based coating layer and the reflection enhancement layer on the water-based coating layer are removed and dissolved in water, and the area on the micro-nano structure layer where the water-based coating layer is not printed is retained; Step 6: Gravure or silk-screen a reinforced protective layer on the holographic pattern reflection enhancement layer and the non-holographic pattern area on the micro-nano structure layer. The reinforced protective layer is made of UV ink with a thickness of 3-5um and dried by ultraviolet light; Step 7: A cross-linking layer is coated on the reinforced protective layer. The cross-linking layer 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.

10. The document anti-counterfeiting film structure according to claim 9, characterized in that: The thickness of the water-based coating layer is 2-10 um.

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