Safety device and safety document

Abstract

The present invention provides a security device and a security document. The security device includes: a plastic substrate; a first ink layer disposed on the front surface of the plastic substrate to form front-side graphics; a second ink layer disposed on the back surface of the plastic substrate to form back-side graphics; the front-side graphics and the back-side graphics are printed in a front-back opposite manner, and the front-back opposite printing includes front-back complementary printing and front-back complete printing; wherein, the first ink layer includes angle-dependent color-changing ink and / or metallic effect ink, and the second ink layer includes angle-dependent color-changing ink and / or metallic effect ink.

Description

Technical Field

[0001] The present invention relates to anti-counterfeiting technology, and more particularly, to a security device and a security document. Background Art

[0002] Currently, the development of anti-counterfeiting elements based on plastic substrates described in the related art mostly focuses on the utilization and improvement of the properties of the material itself and the loading of optical performance elements on the plastic substrate. Their anti-counterfeiting ability is weak, and the identification process requires additional instrument equipment, making it troublesome and complex to distinguish between genuine and fake.

[0003] Therefore, how to propose a security device with strong anti-counterfeiting ability, not easily counterfeited, and a relatively simple way to distinguish between genuine and fake has become an urgent problem to be solved at present. Summary of the Invention

[0004] The present invention aims to provide a security device to solve one of the technical problems existing in the prior art or related art.

[0005] Therefore, the first object of the present invention is to provide a security device.

[0006] The second object of the present invention is to provide a security document.

[0007] To achieve the above object, the technical solution of the first aspect of the present invention provides a security device, including: a plastic substrate; a first ink layer disposed on the front surface of the plastic substrate to form front surface graphics; a second ink layer disposed on the back surface of the plastic substrate to form back surface graphics; the front surface graphics and the back surface graphics are printed in a front-back opposite manner, and the front-back opposite printing includes front-back complementary printing and front-back complete printing; wherein, the first ink layer includes angle-dependent color-changing ink and / or metal effect ink, and the second ink layer includes angle-dependent color-changing ink and / or metal effect ink.

[0008] The security device provided by the present invention includes a plastic substrate, a first ink layer, and a second ink layer. The first ink layer is disposed on the front surface of the plastic substrate, and the second ink layer is disposed on the back surface of the plastic substrate. That is, the first ink layer and the second ink layer are correspondingly disposed on the front and back surfaces of the plastic substrate. The first ink layer and the second ink layer can form front-side graphics and back-side graphics on the plastic substrate. The front-side graphics and the back-side graphics have the same shape, the same size, and overlapping setting positions, and can form perfect front-back registration. Perfect front-back registration means that the front and back are substantially completely overlapped and registered. The accuracy of front-back registration printing is extremely high, the error is extremely small, and the tolerance is less than 1 mm, preferably less than 0.5 mm. Or the front-side graphics and the back-side graphics can form complementary front-back registration, that is, the front-side graphics and the back-side graphics can be spliced to form a complete graphic. Thus, anti-counterfeiting can be achieved by judging whether the graphics are perfectly front-back registered or complementary front-back registered, without the need to use an instrument to identify the authenticity. As is known to those skilled in the art, it is relatively difficult to achieve perfect front-back registration or complementary front-back registration of metal-effect ink or angle-dependent color-changing ink. Therefore, it can be used for anti-counterfeiting, improving the anti-counterfeiting effect. Among them, the first ink layer includes angle-dependent color-changing ink and / or metal-effect ink, and the second ink layer includes angle-dependent color-changing ink and / or metal-effect ink. The angle-dependent color-changing ink has different colors when observed from different viewing angles and has a certain metallic flashing effect. The metal-effect ink has a metallic luster and a flashing effect. By the color change characteristics of the angle-dependent color-changing ink and the metal-effect ink, the difficulty of forging the security device is further increased.

[0009] Further, the plastic substrate includes one of biaxially oriented polypropylene, polycarbonate, PET (polyethylene terephthalate), PE (polyethylene), PVC (polyvinyl chloride), paper-plastic composite, and other films.

[0010] In addition, the security device provided by the present application may further have the following additional technical features:

[0011] In the above technical solution, the first ink layer includes angle-dependent color-changing ink, the second ink layer includes metal-effect ink, and the angle-dependent color-changing ink and the metal-effect ink are front-back registered; when the angle-dependent color-changing ink is observed at a first viewing angle, its color and / or flashing effect is similar to or consistent with that of the metal-effect ink; and / or when the angle-dependent color-changing ink is observed at a second viewing angle, it has a color different from that of the metal-effect ink.

[0012] In this technical solution, the first ink layer is provided with angle-dependent color-changing ink, and the second ink layer is provided with metallic effect ink, so that the angle-dependent color-changing ink and the metallic effect ink are printed in reverse on the front and back. In this way, when the angle-dependent color-changing ink is observed at the first viewing angle, its color and flashing effect are similar to or the same as those of the metallic effect ink. And / or when the angle-dependent color-changing ink is observed at the second viewing angle, it has a color different from that of the metallic effect ink. With this kind of setting, by comparing the difference between the image of the angle-dependent color-changing ink at the first viewing angle and the image of the metallic effect ink at the first viewing angle, when making an anti-counterfeiting judgment, the color of the metallic effect ink can be used as a reference to judge whether the color of the angle-dependent color-changing ink is correct. If it is correct, the security device is determined to be genuine; otherwise, the security device is determined to be fake. Specifically, when the angle-dependent color-changing ink is observed at the first viewing angle, it has the same color as the metallic effect ink. When the angle-dependent color-changing ink is observed at the second viewing angle, it has a color different from that of the metallic effect ink. Therefore, the authenticity of the security device can be judged by determining whether the color is correct.

[0013] In the above technical solution, the first ink layer includes the first angle-dependent color-changing ink, the second ink layer includes the second angle-dependent color-changing ink, and the first angle-dependent color-changing ink and the second angle-dependent color-changing ink are printed in reverse on the front and back; the first angle-dependent color-changing ink and the second angle-dependent color-changing ink have similar or the same color when observed at the first viewing angle; and / or the first angle-dependent color-changing ink and the second angle-dependent color-changing ink have different colors when observed at the second viewing angle.

[0014] In this technical solution, the first ink layer is set as the first angle-dependent color-changing ink, the second ink layer is set as the second angle-dependent color-changing ink, and the first angle-dependent color-changing ink and the second angle-dependent color-changing ink are printed in reverse on the front and back. Thus, the first angle-dependent color-changing ink and the second angle-dependent color-changing ink have similar or the same color when observed at the first viewing angle, and / or the first angle-dependent color-changing ink and the second angle-dependent color-changing ink have different colors when observed at the second viewing angle. Therefore, the inks on both sides can form a more obvious reference, avoiding differences in the inks themselves, so that the colors of the reverse printing on the front and back can be closer. By observing the security device at different viewing angles and according to the different color effect differences observed, it can be used as a basis for anti-counterfeiting judgment.

[0015] In any of the above technical solutions, the first viewing angle includes a front-viewing angle, and the second viewing angle includes a horizontal-viewing angle; wherein, the front-viewing angle includes a viewing angle perpendicular to or close to perpendicular to the first ink layer and / or the second ink layer, and the horizontal-viewing angle includes a viewing angle parallel to or close to parallel to the first ink layer and / or the second ink layer.

[0016] In this technical solution, the first viewing angle includes a front view angle, and the second viewing angle includes a horizontal view angle. Among them, the front view angle includes a viewing angle that is close to being perpendicular to the first ink layer and / or the second ink layer, and the horizontal view angle includes a viewing angle that is close to being parallel to the first ink layer and / or the second ink layer. Of course, the specific front view angle and horizontal view angle are not limited to this. It can be proved here that when observing from two different angles, there are different viewing effects.

[0017] In the present invention, being close to perpendicular means that the included angle between the viewing angle and the perpendicular line of the plastic substrate surface is between 0° and 15°, and being close to parallel means that the included angle between the viewing angle and the horizontal line of the substrate is between 0° and 30°.

[0018] To further evaluate the color proximity of the angle-dependent color-changing ink, the metallic effect ink, and the two angle-dependent color-changing inks at the first viewing angle, a BYK-mac multi-angle colorimeter is used to test the color and the degree of sparkle of the ink scraping sample sheet. The Lch value measured by the instrument at -15° represents the color of the ink when viewed horizontally, and the Lch value measured by the instrument at 45° represents the color of the ink when viewed directly. Sg15 represents the degree of sparkle of the ink. When the colors of the two inks are close, to increase the matching degree of the appearance effects of the two inks, it is preferably that the difference Δh of the h values measured by the instrument is less than 15, and Δh is more preferably less than 10. The difference ΔSg15 of the sparkle degrees Sg15 of the two inks is less than 2, and ΔSg15 is more preferably less than 1.

[0019] In the above technical solution, a white coating, an angle-dependent color-changing ink, and / or a metallic effect ink are coated on a plastic substrate to form a plastic base material. The plastic base material includes a transparent window and an opaque area. The front and back surfaces of the transparent window are respectively printed with a first ink layer and a second ink layer, and the opaque area is printed with a third ink layer; the third ink layer forms an overprint or a joint with the first ink layer and / or the second ink layer.

[0020] In this technical solution, a white coating and a metallic effect ink are coated on a plastic substrate to form a plastic base material. The plastic base material includes a transparent window and an opaque area. A first ink layer and a second ink layer are printed on the front and back of the transparent window respectively, and a third ink layer is printed on the opaque area. The first ink layer and the second ink layer form a front-back counterprint, including a complete front-back counterprint or a complementary front-back counterprint. Further, the first ink layer and / or the second ink layer are overprinted with an opaque coating. Further, the first ink layer and the second ink layer extend from the transparent window to the opaque area. The opaque coating is overprinted or wired with the first ink layer and / or the second ink layer. With this setting, the first ink layer and the second ink layer are directly printed on the transparent window, which is convenient for mutual reference when forming a front-back counterprint on both sides, thereby improving the processing accuracy of the front-back counterprint. And the first ink layer and the second ink layer of the front-back counterprint extend from the transparent window to the opaque area. The opaque coating is overprinted or wired with the first ink layer and / or the second ink layer, or the third ink layer is overprinted or wired with the first ink layer and / or the second ink layer. An overprint or wiring can be formed on the opaque area, and thus an anti-counterfeiting mark can be formed through the overprint or wiring, thereby improving the security of the security device and increasing the difficulty of counterfeiting.

[0021] In the above technical solution, the hiding power of the opaque area is greater than 70%.

[0022] In the above technical solution, the thickness of the plastic base material is greater than or equal to 60 μm and less than or equal to 110 μm; and / or the thickness of the first ink layer and / or the second ink layer is greater than or equal to 2 μm and less than or equal to 10 μm.

[0023] In this technical solution, the thickness of the plastic base material is greater than or equal to 60 μm and less than or equal to 110 μm; and / or the thickness of the first ink layer and / or the second ink layer is greater than or equal to 2 μm and less than or equal to 10 μm. This makes the thickness of the plastic base material, the first ink layer and the second ink layer moderate, which is convenient for forming a front-back counterprint and enhancing the anti-counterfeiting effect.

[0024] In the above technical solution, the first ink layer and the second ink layer are complementary front-back counterprinted. The first ink layer is printed with a first pattern on the front, and the second ink layer is printed with a second pattern on the back. When observing through the front or the back, the first pattern and the second pattern are complementary to form a third pattern; when observing from a first angle, the third pattern formed by the complementary first pattern and the second pattern has a consistent appearance and appears as one pattern; when observing from a second angle, the third pattern appears as two patterns.

[0025] In this technical solution, the first ink layer and the second ink layer are printed in a complementary front-back manner. The first ink layer is printed with a first pattern on the front side, and the second ink layer is printed with a second pattern on the back side. When observing through the front side or the back side, the first pattern and the second pattern complement each other to form a third pattern. By observing whether the patterns set on both sides of the security device are complementary or identical, the authenticity of the security device can be determined, further increasing the difficulty of forging the security device.

[0026] In the above technical solution, the metallic effect ink includes a water-based resin, an auxiliary agent, a cross-linking agent, a water-based nano-color paste, and a metallic effect pigment with an average particle size of 5 μm - 30 μm.

[0027] In this technical solution, the metallic effect ink includes a water-based resin, an auxiliary agent, a cross-linking agent, a water-based nano-color paste, and a metallic effect pigment with an average particle size of 5 μm - 30 μm. By setting the metallic effect ink to include the above materials, the metallic effect ink can exhibit a good metallic scintillation effect and printing suitability, and increase the difficulty of forgery.

[0028] Furthermore, the average particle size of the metallic effect pigment is preferably 10 μm - 25 μm.

[0029] In the above technical solution, the angle-dependent color-changing ink includes a water-based resin, an auxiliary agent, a cross-linking agent, a water-based nano-color paste, and an angle-dependent color-changing pigment with an average particle size of 5 μm - 30 μm.

[0030] In this technical solution, the angle-dependent color-changing ink includes a water-based resin, an auxiliary agent, a cross-linking agent, a water-based nano-color paste, and an angle-dependent color-changing pigment with an average particle size of 5 μm - 30 μm. By setting the angle-dependent color-changing ink to include the above materials, the angle-dependent color-changing ink can exhibit a good color-changing and metallic scintillation effect, while showing good printing suitability, and increase the difficulty of forgery.

[0031] Furthermore, the average particle size of the angle-dependent color-changing pigment is preferably 10 μm - 25 μm.

[0032] In the above technical solution, the metallic effect pigment includes: metallic pigment, effect pigment.

[0033] In this technical solution, the metallic effect pigment can be a metallic pigment and an effect pigment. Among them, the metallic pigment includes copper-zinc alloy powder and aluminum powder, commonly known as gold powder and silver powder. Different proportions of copper and zinc can be formulated into metallic colors with different hues such as red gold, gold, and blue gold. The effect pigment is based on the traditional mica-titanium pearlescent pigment. Through precise coating technology, with glass, synthetic mica, or alumina (corundum) as the substrate, one or more layers of metal oxides with high reflectivity are coated to obtain it. By controlling the type and coating thickness of the metal oxide, a series of interference colors such as gold, bronze, and red gold can be obtained.

[0034] In the above technical solution, the angle-dependent color pigment includes: pigments with a multi-layer optical interference structure.

[0035] In this technical solution, the angle-dependent color pigment can be a pigment with a multi-layer optical interference structure. Prepared by physical vapor deposition (PVD) or wet chemical methods, by selecting metal oxides with appropriate refractive indices and appropriate thicknesses, an obvious angle-dependent color phenomenon can be obtained. Due to the different refractive indices of the coating material and the substrate material (optical interference effect), when observed at two different angles, namely the frontal view and the grazing view, such pigments can exhibit obvious color change characteristics (the principle is based on the optical interference effect). For example, it appears as one color when observed at an approximately perpendicular angle, and as a second color when observed at an approximately horizontal angle.

[0036] In the above technical solution, the waterborne resin includes: waterborne acrylic resin, waterborne polyurethane resin, and waterborne polyester resin.

[0037] In this technical solution, the waterborne resin can be waterborne acrylic resin, waterborne polyurethane resin, waterborne polyester resin, etc. Of course, the waterborne resin can also be other resins, and the specific resin to be used can be set according to actual requirements.

[0038] In the above technical solution, the average particle size of the waterborne nano-color paste is 100nm - 800nm, and the content of the waterborne nano-color paste is 0% - 8%; the content of the waterborne resin is 40% - 75%; the content of the additive is 0.5% - 10%; the content of the metallic effect pigment or the angle-dependent color pigment is 10% - 35%; the content of the crosslinking agent is 1% - 10%.

[0039] In this technical solution, the average particle size of the waterborne nano-color paste is 100nm - 800nm, the content of the waterborne nano-color paste is 0% - 8%, the content of the waterborne resin is 40% - 75%, the content of the additive is 0.5% - 10%, the content of the metallic effect pigment or the angle-dependent color pigment is 10% - 35%; the content of the crosslinking agent is 1% - 10%. Through the ratio setting of the above materials, not only can the appearance color of the metallic effect ink or the angle-dependent color ink be guaranteed, but also the metallic flashing effect of the ink is not affected, making it more difficult to counterfeit the security device.

[0040] Furthermore, the content of the waterborne nano-color paste is preferably 2% - 6%.

[0041] In the above technical solution, the tolerance of the front and back graphic sizes formed when the first ink layer and the second ink layer are perfectly printed front and back is less than 1mm.

[0042] In this technical solution, the tolerance of the sizes of the patterns formed by the first ink layer and the second ink layer in perfect front-back registration is less than 1 mm. The first ink layer and the second ink layer are in perfect front-back registration, that is, the shapes, sizes, and set positions of the front patterns and the back patterns are the same, making the front-back registration of the first ink layer and the second ink layer more accurate and increasing the difficulty of counterfeiting.

[0043] Further, it is preferably that the tolerance of the sizes of the front and back patterns formed when the first ink layer and the second ink layer are in perfect front-back registration is less than 0.5 mm.

[0044] In the above technical solution, the first ink layer and the second ink layer are printed on the front and back sides of the plastic substrate by rotary gravure printing.

[0045] In this technical solution, the first ink layer and the second ink layer are printed on the front and back sides of the plastic substrate by rotary gravure printing. High-precision printing by rotary gravure realizes accurate front-back registration. Accurate registration, as a printing anti-counterfeiting technology, is not easy to achieve, especially in large-scale continuous printing processes where extremely high requirements are placed on printing positioning accuracy, greatly increasing the difficulty of forgery.

[0046] In the above technical solution, the first ink layer and the second ink layer complete the front and back printing successively through one process.

[0047] In this technical solution, the first ink layer and the second ink layer complete the front and back printing successively through one process. Compared with multiple processes, one process can make the printing of the first ink layer and the second ink layer more accurate and can form complete front-back registration.

[0048] In the above technical solution, a center positioning structure is provided on the front and back sides of the plastic substrate.

[0049] In this technical solution, a center positioning structure is provided on the front and back sides of the plastic substrate to facilitate center alignment during printing so as to form complete front-back registration.

[0050] In the above technical solution, the hiding power of both the first ink layer and the second ink layer is greater than 50%.

[0051] In this technical solution, the hiding power of both the first ink layer and the second ink layer is greater than 50%, which can prevent the mutual influence of the metallic effect ink and the angle-dependent color-changing ink in front-back printing and improve the printing effect.

[0052] In the above technical solution, the first ink layer and the second ink layer are set in a preset grid with different micro-structures, and the magnified micro-structures of the preset grid are used for anti-counterfeiting judgment.

[0053] In this technical solution, the first ink layer and the second ink layer are provided with preset grids in different micro-states. The micro-states of the preset grids are invisible to the naked eye and can be seen after magnifying by a preset multiple. Therefore, the magnified micro-states of the preset grids can be used for anti-counterfeiting judgment, further enhancing the anti-counterfeiting effect.

[0054] The technical solution of the second aspect of the present invention provides a security document, including: the security device in any one of the technical solutions of the first aspect.

[0055] According to the security document provided by the present invention, since it includes the security device in any one of the technical solutions of the first aspect. Therefore, the security document provided by the present invention also has all the beneficial effects of the security device in any one of the technical solutions of the first aspect, which will not be elaborated here.

[0056] The technical solution of the third aspect of the present invention provides a manufacturing method of a security device. The security device includes: a plastic substrate, and the plastic substrate includes a transparent window and an opaque area. The manufacturing method includes: coating at least one opaque coating on the front and back of the transparent plastic substrate in substantially the same area, and the area where the opaque coating is not coated forms the transparent window of the plastic substrate. At the same time, the angle-dependent color-changing ink and / or the metal-effect ink are printed on the transparent windows on the front and back of the plastic substrate; further, the angle-dependent color-changing ink and / or the metal-effect ink printed on the transparent window can form an overprint with the surrounding opaque coating; further, the angle-dependent color-changing ink and / or the metal-effect ink can extend from the transparent window and be printed on the opaque coating; further, the angle-dependent color-changing ink and / or the metal-effect ink printed on the opaque coating forms an overprint with the subsequent opaque coating; further, the angle-dependent color-changing ink and / or the metal-effect ink printed on the opaque coating forms an overprint or a connection with the subsequent offset printing pattern.

[0057] According to the manufacturing method of the security device provided by the present invention, it includes a plastic substrate, and the plastic substrate includes a transparent window and an opaque area. The plastic substrate is formed by coating at least one opaque coating on the front and back of the transparent plastic substrate in substantially the same area, and the area where the opaque coating is not coated forms the transparent window of the plastic substrate. At the same time, the angle-dependent color-changing ink and / or the metal-effect ink are printed on the transparent windows on the front and back of the plastic substrate; further, the angle-dependent color-changing ink and / or the metal-effect ink printed on the transparent window can form an overprint with the surrounding opaque coating; further, the angle-dependent color-changing ink and / or the metal-effect ink can extend from the transparent window and be printed on the opaque coating; further, the angle-dependent color-changing ink and / or the metal-effect ink printed on the opaque coating forms an overprint with the subsequent opaque coating; further, the angle-dependent color-changing ink and / or the metal-effect ink printed on the opaque coating forms an overprint or a connection with the subsequent offset printing pattern.

[0058] Additional aspects and advantages of the present invention will become apparent in the following description section, or be learned through the practice of the present invention. Description of the Drawings

[0059] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0060] Figure 1 is a front view when the front and back of the security device according to an embodiment of the present invention are perfectly printed in register;

[0061] Figure 2 is according to an embodiment of the present invention Figure 1 top view;

[0062] Figure 3 is a schematic diagram of perspective observation when front and back complementary printing is performed according to an embodiment of the present invention;

[0063] Figure 4 is according to an embodiment of the present invention Figure 3 schematic diagram of the front pattern;

[0064] Figure 5 is according to an embodiment of the present invention Figure 1 schematic diagram of the back pattern.

[0065] Wherein, Figures 1 to 5 the corresponding relationship between the reference numerals in

[0066] 1 second ink layer, 2 plastic substrate, 3 opaque region, 4 first ink layer, 5 third ink layer, 6 transparent window. Detailed Embodiments

[0067] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below in conjunction with the drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0068] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention may be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0069] The following refers to Figures 1 to 5 to describe the security device provided according to an embodiment of the present invention.

[0070] Embodiment 1

[0071] As Figure 1 andFigure 2 As shown in the figure, the first embodiment of the first aspect of the present invention provides a security device, including a plastic substrate 2, a first ink layer 4 and a second ink layer 1. The first ink layer 4 is disposed on the front surface of the plastic substrate 2 to form front-side graphics and texts. The second ink layer 1 is disposed on the back surface of the plastic substrate 2 to form back-side graphics and texts; the front-side graphics and texts and the back-side graphics and texts are perfectly printed in register front and back. Among them, the first ink layer 4 includes angle-dependent color-changing ink and / or metallic-effect ink, and the second ink layer 1 includes angle-dependent color-changing ink and / or metallic-effect ink.

[0072] The security device provided by the present invention includes a plastic substrate 2, a first ink layer 4 and a second ink layer 1. The first ink layer 4 is disposed on the front surface of the plastic substrate 2, and the second ink layer 1 is disposed on the back surface of the plastic substrate 2, that is, the first ink layer 4 and the second ink layer 1 are correspondingly disposed on the front and back surfaces of the plastic substrate 2. The first ink layer 4 and the second ink layer 1 can form front-side graphics and texts and back-side graphics and texts on the plastic substrate 2. The front-side graphics and texts and the back-side graphics and texts have the same shape, the same size, and overlapping setting positions, and can form perfect printing in register front and back, or the front-side graphics and texts and the back-side graphics and texts can form complementary printing in register front and back, that is, the front-side graphics and texts and the back-side graphics and texts can be spliced to form a complete graphic. Therefore, it is possible to prevent counterfeiting by judging whether the graphics are perfectly printed in register front and back, without the need to use an instrument to identify the authenticity. As known to those skilled in the art, it is relatively difficult to achieve perfect printing in register front and back or complementary printing in register front and back with metallic-effect ink or angle-dependent color-changing ink. Therefore, it can be used for anti-counterfeiting and improves the anti-counterfeiting effect. Among them, the first ink layer 4 includes angle-dependent color-changing ink and / or metallic-effect ink, and the second ink layer 1 includes angle-dependent color-changing ink and / or metallic-effect ink. The angle-dependent color-changing ink has different colors when observed from different viewing angles. By the color change characteristics of the angle-dependent color-changing ink and the metallic-effect ink, the difficulty of forging the security device is further increased.

[0073] Further, the plastic substrate 2 includes one of films such as biaxially oriented polypropylene, polycarbonate, PET, PE, PVC, paper-plastic composite, etc.

[0074] In the above embodiment, the first ink layer 4 includes angle-dependent color-changing ink, and the second ink layer 1 includes metallic-effect ink. The angle-dependent color-changing ink and the metallic-effect ink are printed in register front and back; when the angle-dependent color-changing ink is observed at the first viewing angle, its color and flashing effect are similar to or the same as those of the metallic-effect ink; and / or when the angle-dependent color-changing ink is observed at the second viewing angle, it has a different color from the metallic-effect ink.

[0075] In this embodiment, the first ink layer 4 is provided with angle-dependent color-changing ink, and the second ink layer 1 is provided with metallic-effect ink, so that the angle-dependent color-changing ink and the metallic-effect ink are printed back-to-back. In this way, when the angle-dependent color-changing ink is observed at the first viewing angle, its color and flashing effect are similar to or the same as those of the metallic-effect ink. And / or when the angle-dependent color-changing ink is observed at the second viewing angle, it has a color different from that of the metallic-effect ink. This setting can compare the differences between the image of the angle-dependent color-changing ink at the first viewing angle and the image of the metallic-effect ink at the first viewing angle. When making an anti-counterfeiting judgment, the color of the metallic-effect ink can be used as a reference to determine whether the color of the angle-dependent color-changing ink is correct. If it is correct, the security device is determined to be genuine; otherwise, the security device is determined to be fake. Specifically, when the angle-dependent color-changing ink is observed at the first viewing angle, it has the same color as the metallic-effect ink. When the angle-dependent color-changing ink is observed at the second viewing angle, it has a color different from that of the metallic-effect ink. Therefore, the authenticity of the security device can be determined by judging whether the color is correct.

[0076] In the above embodiment, the first ink layer 4 includes a first angle-dependent color-changing ink, and the second ink layer 1 includes a second angle-dependent color-changing ink. The first angle-dependent color-changing ink and the second angle-dependent color-changing ink are printed back-to-back; the first angle-dependent color-changing ink and the second angle-dependent color-changing ink have similar or the same color when observed at the first viewing angle; and / or the first angle-dependent color-changing ink and the second angle-dependent color-changing ink have different colors when observed at the second viewing angle.

[0077] In this embodiment, the first ink layer 4 is set as the first angle-dependent color-changing ink, and the second ink layer 1 is set as the second angle-dependent color-changing ink. The first angle-dependent color-changing ink and the second angle-dependent color-changing ink are printed back-to-back. Thus, the first angle-dependent color-changing ink and the second angle-dependent color-changing ink have similar or the same color when observed at the first viewing angle, and / or the first angle-dependent color-changing ink and the second angle-dependent color-changing ink have different colors when observed at the second viewing angle. Therefore, the inks on both sides can form a more obvious reference, avoiding differences in the inks themselves, so that the colors of the back-to-back printing are closer. By observing the security device at different viewing angles and according to the observed different color effect differences, it can be used as a basis for anti-counterfeiting judgment.

[0078] In any of the above embodiments, the first viewing angle includes a frontal viewing angle, and the second viewing angle includes a horizontal viewing angle; wherein, the frontal viewing angle includes a viewing angle that is approximately perpendicular to the first ink layer 4 and / or the second ink layer 1, and the horizontal viewing angle includes a viewing angle that is approximately parallel to the first ink layer 4 and / or the second ink layer 1.

[0079] In this embodiment, the first viewing angle includes a front-facing angle, and the second viewing angle includes a horizontal viewing angle. Among them, the front-facing angle includes a viewing angle that is nearly perpendicular to the first ink layer 4 and / or the second ink layer 1, and the horizontal viewing angle includes a viewing angle that is nearly parallel to the first ink layer 4 and / or the second ink layer 1. Of course, the specific front-facing angle and horizontal viewing angle are not limited to this. It can be proved here that different viewing effects are obtained when observing from two different angles.

[0080] In the present invention, "nearly perpendicular" means that the included angle between the viewing angle and the perpendicular line of the substrate surface is within 0° - 15°, and "nearly parallel" means that the included angle between the viewing angle and the horizontal line of the substrate is within 0° - 30°.

[0081] To further evaluate the color proximity of the angle-dependent color-changing ink, the metallic effect ink, and the two angle-dependent color-changing inks at the first viewing angle, a BYK-mac multi-angle colorimeter is used to test the color and the degree of flicker of the ink scraping sample sheet. The Lch value measured at -15° by the instrument represents the color of the ink when viewed horizontally, and the Lch value measured at 45° by the instrument represents the color of the ink when viewed directly. Sg15 represents the degree of flicker of the ink. When the colors of the two inks are close, to increase the matching degree of the appearance effects of the two inks, it is preferably that the difference Δh of the h value measured by the instrument is less than 15, and Δh is more preferably less than 10. The difference ΔSg15 of the degree of flicker Sg15 of the two inks is less than 2, and ΔSg15 is more preferably less than 1.

[0082] In the above embodiment, a white coating, an angle-dependent color-changing ink, and / or a metallic effect ink are coated on the plastic substrate 2 to form a plastic base material. The plastic base material includes a transparent window 6 and an opaque area 3. The front and back of the transparent window 6 are respectively printed with a first ink layer 4 and a second ink layer 1, and the opaque area 3 is printed with a third ink layer 5; the third ink layer 5 forms an overprint or a joint with the first ink layer 4 and / or the second ink layer 1.

[0083] In this embodiment, a white coating, a color - changing ink and / or a metallic - effect ink are coated on a plastic substrate 2 to form a plastic base material. The plastic base material includes a transparent window 6 and an opaque area 3. A first ink layer 4 and a second ink layer 1 are printed on the front and back surfaces of the transparent window 6 respectively, and a third ink layer 5 is printed on the opaque area 3. The first ink layer 4 and the second ink layer 1 form a front - back counter - printing, including complete front - back counter - printing or complementary front - back counter - printing. Further, the first ink layer 4 and / or the second ink layer 1 are overprinted with an opaque coating. Further, the first ink layer 4 and the second ink layer 1 extend from the transparent window 6 to the opaque area 3, and the opaque coating is overprinted or wired with the first ink layer 4 and / or the second ink layer 1. With this kind of setting, the first ink layer 4 and the second ink layer 1 are directly printed on the transparent window 6, which is convenient for mutual reference when forming front - back counter - printing on both sides, thereby improving the processing accuracy of front - back counter - printing. And the front - back counter - printed first ink layer 4 and second ink layer 1 extend from the transparent window 6 to the opaque area 3, the opaque coating is overprinted or wired with the first ink layer 4 and / or the second ink layer 1, or the third ink layer 5 is overprinted or wired with the first ink layer 4 and / or the second ink layer 1. An overprint or a wire can be formed on the opaque area 3, so as to form an anti - counterfeiting mark through the overprint or the wire, thereby improving the security of the security device and increasing the difficulty of counterfeiting.

[0084] In the above - mentioned embodiment, the hiding power of the opaque area 3 is greater than 70%.

[0085] In the above - mentioned embodiment, the thickness of the plastic base material is greater than or equal to 60 μm and less than or equal to 110 μm; and / or the thickness of the first ink layer 4 and / or the second ink layer 1 is greater than or equal to 2 μm and less than or equal to 10 μm.

[0086] In this embodiment, the thickness of the plastic base material is greater than or equal to 60 μm and less than or equal to 110 μm; and / or the thickness of the first ink layer 4 and / or the second ink layer 1 is greater than or equal to 2 μm and less than or equal to 10 μm. This makes the thicknesses of the plastic base material, the first ink layer 4 and the second ink layer 1 appropriate, which is convenient for forming front - back counter - printing and improving the anti - counterfeiting effect.

[0087] In the above - mentioned embodiment, the first ink layer 4 and the second ink layer 1 are complementary front - back counter - printed. The first ink layer 4 is printed with a first pattern on the front, and the second ink layer 1 is printed with a second pattern on the back. When observing through the front or the back, the first pattern and the second pattern are complementary to form a third pattern; when observing from a first angle, the third pattern formed by the complementary first pattern and second pattern has the same appearance and shows as one pattern; when observing from a second angle, the third pattern shows as two patterns.

[0088] In this embodiment, the first ink layer 4 and the second ink layer 1 are printed in a complementary front-back manner. The first ink layer 4 is printed with a first pattern on the front side, and the second ink layer 1 is printed with a second pattern on the back side. When observed through the front side or the back side, the first pattern and the second pattern complement each other to form a third pattern. By observing whether the patterns set on both sides of the security device are complementary or identical, the authenticity of the security device can be determined, further increasing the difficulty of forging the security device.

[0089] In the above embodiment, the metallic effect ink includes an aqueous resin, an auxiliary agent, a crosslinking agent, an aqueous nano-color paste, and a metallic effect pigment with an average particle size of 5 μm - 30 μm.

[0090] In this embodiment, the metallic effect ink includes an aqueous resin, an auxiliary agent, a crosslinking agent, an aqueous nano-color paste, and a metallic effect pigment with an average particle size of 5 μm - 30 μm. By setting the metallic effect ink to include the above materials, the metallic effect ink can exhibit a good metallic glitter effect and printing suitability, and increase the difficulty of forgery.

[0091] Furthermore, the average particle size of the metallic effect pigment is preferably 10 μm - 25 μm.

[0092] In the above embodiment, the angle-dependent color-changing ink includes an aqueous resin, an auxiliary agent, a crosslinking agent, an aqueous nano-color paste, and an angle-dependent color-changing pigment with an average particle size of 5 μm - 30 μm.

[0093] In this embodiment, the angle-dependent color-changing ink includes an aqueous resin, an auxiliary agent, a crosslinking agent, an aqueous nano-color paste, and an angle-dependent color-changing pigment with an average particle size of 5 μm - 30 μm. By setting the angle-dependent color-changing ink to include the above materials, the angle-dependent color-changing ink can exhibit a good color-changing and metallic glitter effect, while exhibiting good printing suitability, and increase the difficulty of forgery.

[0094] Furthermore, the average particle size of the angle-dependent color-changing pigment is preferably 10 μm - 25 μm.

[0095] In the above embodiment, the metallic effect pigment includes: metallic pigment, effect pigment.

[0096] In this embodiment, the metallic effect pigment can be a metallic pigment and an effect pigment. Among them, the metallic pigment includes copper-zinc alloy powder and aluminum powder, commonly known as gold powder and silver powder. Different proportions of copper and zinc can be formulated to produce metallic colors with different hues such as red gold, gold, and blue gold. The effect pigment is based on the traditional mica-titanium pearlescent pigment. Through precise coating technology, using glass, synthetic mica, or alumina (corundum) as the substrate, one or more layers of metal oxides with high reflectivity are coated to obtain it. By controlling the type and coating thickness of the metal oxide, a series of interference colors such as gold, bronze, and red gold can be obtained.

[0097] In the above embodiments, the angle-dependent color-changing pigment includes: a pigment having a multi-layer light interference structure.

[0098] In this embodiment, the angle-dependent color-changing pigment can be a pigment having a multi-layer light interference structure. Prepared by physical vapor deposition (PVD) or wet chemical methods, by selecting metal oxides with appropriate refractive indices and appropriate thicknesses, an obvious angle-dependent color-changing phenomenon can be obtained. Due to the different refractive indices of the coating material and the substrate material (optical interference effect), when observed at two different angles, namely the front view and the grazing view, such pigments can exhibit obvious color change characteristics (the principle is based on the optical interference effect). For example, it appears as one color when observed at an approximately perpendicular angle and as a second color when observed at an approximately horizontal angle.

[0099] In the above embodiments, the aqueous resin includes: aqueous acrylic resin, aqueous polyurethane resin, and aqueous polyester resin.

[0100] In this embodiment, the aqueous resin can be aqueous acrylic resin, aqueous polyurethane resin, aqueous polyester resin, etc. Of course, the aqueous resin can also be other resins, and the specific resin to be used can be set according to actual requirements.

[0101] In the above embodiments, the average particle size of the aqueous nano-color paste is 100 nm - 800 nm, and the content of the aqueous nano-color paste is 0% - 8%; the content of the aqueous resin is 40% - 75%; the content of the auxiliary agent is 0.5% - 10%; the content of the metallic effect pigment or the angle-dependent color-changing pigment is 10% - 35%; the content of the cross-linking agent is 1% - 10%.

[0102] In this embodiment, the average particle size of the aqueous nano-color paste is 100 nm - 800 nm, the content of the aqueous nano-color paste is 0% - 8%, the content of the aqueous resin is 40% - 75%, the content of the auxiliary agent is 0.5% - 10%, the content of the metallic effect pigment or the angle-dependent color-changing pigment is 10% - 35%; the content of the cross-linking agent is 1% - 10%. By setting the ratio of the above materials, both the appearance color of the metallic effect ink or the angle-dependent color-changing ink can be ensured, and the metallic flashing effect of the ink is not affected, making it more difficult for the security device to be counterfeited.

[0103] Furthermore, the content of the aqueous nano-color paste is preferably 2% - 6%.

[0104] In the above embodiments, the tolerance of the front and back graphic sizes formed when the first ink layer 4 and the second ink layer 1 are perfectly printed front and back is less than 1 mm.

[0105] In this embodiment, the tolerance of the sizes of the patterns formed by the first ink layer 4 and the second ink layer 1 in perfect front-back registration is less than 1 mm. The first ink layer 4 and the second ink layer 1 are in perfect front-back registration, that is, the shapes, sizes, and setting positions of the front patterns and the back patterns are the same, making the front-back registration of the first ink layer 4 and the second ink layer 1 more accurate and increasing the difficulty of counterfeiting.

[0106] Furthermore, it is preferably that the tolerance of the sizes of the front and back patterns formed when the first ink layer 4 and the second ink layer 1 are in perfect front-back registration is less than 0.5 mm.

[0107] In the above embodiment, the first ink layer 4 and the second ink layer 1 are printed on the front and back sides of the plastic substrate 2 by rotary gravure printing.

[0108] In this embodiment, the first ink layer 4 and the second ink layer 1 are printed on the front and back sides of the plastic substrate 2 by rotary gravure printing. High-precision printing by rotary gravure realizes accurate front-back registration. Accurate registration, as a printing anti-counterfeiting technology, is not easy to achieve, especially in large-scale continuous printing processes where extremely high printing positioning accuracy is required, greatly increasing the difficulty of forgery.

[0109] In the above embodiment, the first ink layer 4 and the second ink layer 1 complete the front and back printing in sequence through one process.

[0110] In this embodiment, the first ink layer 4 and the second ink layer 1 complete the front and back printing in sequence through one process. Compared with multiple processes, one process can make the printing of the first ink layer 4 and the second ink layer 1 more accurate and can form complete front-back registration.

[0111] In the above embodiment, a center positioning structure is provided on the front and back surfaces of the plastic substrate 2.

[0112] In this embodiment, a center positioning structure is provided on the front and back surfaces of the plastic substrate 2 to facilitate center alignment during printing so as to form complete front-back registration.

[0113] In the above embodiment, the first ink layer 4 and the second ink layer 1 are arranged in different micro-shaped preset grids, and the micro-shaped preset grids are used for anti-counterfeiting judgment after being magnified.

[0114] In this embodiment, the first ink layer 4 and the second ink layer 1 are arranged in different micro-shaped preset grids. The micro-shaped preset grids are invisible to the naked eye and are visible after being magnified by a preset multiple, so that the micro-shaped preset grids can be magnified and used for anti-counterfeiting judgment, further enhancing the anti-counterfeiting effect.

[0115] Embodiment Two

[0116] The second embodiment of the first aspect of the present invention provides a security device. The security device of this embodiment is a security device with perfect front-back printing. A metallic effect ink is printed on the first ink layer 4 of the plastic substrate 2, and the metallic effect ink is green gold ink. A green-to-blue angle-dependent color-changing ink is printed on the second ink layer 1 of the plastic substrate 2. When observed from the side where the green gold ink is printed, it shows a green gold effect. When viewed straight on from the side where the green-to-blue angle-dependent color-changing ink is printed, it shows a green gold effect, and when viewed horizontally, it shows a blue color.

[0117] Further, the printing thickness of the metallic effect ink and the angle-dependent color-changing ink is 4 μm, and the thickness of the plastic substrate is 80 μm.

[0118] Further, the metallic effect ink includes waterborne acrylic resin, waterborne polyurethane resin, additives, metallic effect pigments with an average particle size of 18 μm, crosslinking agents, and waterborne nano-color pastes. The angle-dependent color-changing ink includes waterborne acrylic resin, waterborne polyurethane resin, additives, angle-dependent color-changing effect pigments with an average particle size of 16 μm, crosslinking agents, and waterborne nano-color pastes.

[0119] Further, in the metallic effect ink, the average particle size of the waterborne nano-color paste is 500 nm, the waterborne nano-color paste is green, and its content is 6%. The content of the waterborne acrylic resin and the waterborne polyurethane resin is 50%. The content of the additives is 8%. The content of the metallic effect pigments is 30%. The content of the crosslinking agent is 6%. In the angle-dependent color-changing ink, the average particle size of the waterborne nano-color paste is 500 nm, the waterborne nano-color paste is green, and its content is 2%. The content of the waterborne acrylic resin and the waterborne polyurethane resin is 50%. The content of the additives is 8%. The content of the angle-dependent color-changing pigments is 30%. The content of the crosslinking agent is 6%. The test results of the multi-angle colorimeter are shown in Table 1 below:

[0120]

[0121] Table 1

[0122] Among them, L in Table 1 represents brightness, c represents saturation, and h represents color.

[0123] The color difference △h of the two inks tested at 45° is 8.58. The scintillation degree Sg15 of the green gold ink is 5.6, the scintillation degree Sg15 of the green-to-blue angle-dependent color-changing ink is 6.5, and the difference in scintillation degree △Sg15 between the two inks is 0.9.

[0124] Example Three

[0125] The third embodiment of the first aspect of the present invention provides a security device. The security device of this embodiment is a security device with perfect front-back printing. Gold ink is printed on the first ink layer 4 of the plastic substrate 2, and red gold ink is printed on the second ink layer 1 of the plastic substrate 2. When observed from the side of the first ink layer 4, it shows a gold effect, and when observed from the side of the second ink layer 1, it shows a red gold effect.

[0126] Further, the printing thickness of the metallic effect ink and the angle-dependent color-changing ink is 3 μm, and the thickness of the plastic substrate is 75 μm.

[0127] Embodiment Four

[0128] The fourth embodiment of the first aspect of the present invention provides a security device. The security device of this embodiment is a security device with perfect front-back printing. Angle-dependent color-changing ink that changes from green to blue is printed on the first ink layer 4 of the plastic substrate 2, and angle-dependent color-changing ink that changes from green to magenta is printed on the second ink layer 1 of the plastic substrate 2. When observed at a frontal viewing angle, the colors of both the green-to-blue angle-dependent color-changing ink and the green-to-magenta angle-dependent color-changing ink are green. There are obvious differences in the colors of the two inks when viewed horizontally.

[0129] Further, the printing thickness of the two angle-dependent color-changing inks is 7 μm, and the thickness of the plastic substrate is 85 μm.

[0130] Further, the angle-dependent color-changing ink includes water-based resin, additives, angle-dependent color-changing pigments with an average particle size of 16 μm, and cross-linking agents.

[0131] Further, the average particle size of the water-based nano-color paste is 300 nm, and the content of the water-based nano-color paste is 7%. The content of the water-based resin is 49%. The content of the additives is 9%. The test results of the multi-angle colorimeter are as follows

[0132] Table 2:

[0133]

[0134] Table 2

[0135] Among them, L in Table 2 represents brightness, c represents saturation, and h represents color.

[0136] The color difference △h of the two inks at a 45° test is 1.94. The flicker degree Sg15 of the green-to-magenta angle-dependent color-changing ink is 5.9, the flicker degree Sg15 of the green-to-blue angle-dependent color-changing ink is 6.5, and the difference in flicker degree △Sg15 between the two inks is 0.6.

[0137] Embodiment Five

[0138] As Figure 3 、 Figure 4 and Figure 5As shown, the fifth embodiment of the first aspect of the present invention provides a security device, and the security device of this embodiment is a security device with complementary printing on the front and back. When viewed from the front, there is one pattern, and when viewed from the front, there are two patterns, and the two patterns complement each other to form a new pattern. The first ink layer 4 prints green-blue angle-dependent ink, and the second ink layer 1 prints green metallic effect ink. The first ink layer 4 and the second ink layer 1 each present a pattern, and when viewed directly, the pattern colors of the first ink layer 4 and the second ink layer 1 are both green, presenting a new pattern. When viewed from the front, the two inks have different colors, presenting two patterns.

[0139] An embodiment of the second aspect of the present invention provides a security document, comprising: the security device in any one of the embodiments of the first aspect.

[0140] The security document provided by the present invention comprises the security device in any one of the embodiments of the first aspect. Therefore, the security document provided by the present invention also has all the beneficial effects of the security device in any one of the embodiments of the first aspect, which will not be described in detail here.

[0141] The embodiment of the third aspect of the present invention provides a method for manufacturing a security device, the security device comprising: a plastic substrate, the plastic substrate comprising a transparent window and an opaque area. The manufacturing method comprises: coating at least one layer of opaque coating on substantially the same area on the front and back of the transparent plastic substrate, and the area not coated with the opaque coating forms a transparent window of the plastic substrate. At the same time, the angularly variable ink and / or the metallic effect ink are printed on the transparent windows on the front and back of the plastic substrate; further, the angularly variable ink and / or the metallic effect ink printed on the transparent window can form an overprint with the surrounding opaque coating; further, the angularly variable ink and / or the metallic effect ink can be extended from the transparent window to the opaque coating; further, the angularly variable ink and / or the metallic effect ink printed on the opaque coating forms an overprint with the subsequent opaque coating; further, the angularly variable ink and / or the metallic effect ink printed on the opaque coating forms an overprint or connection with the subsequent offset printing pattern.

[0142] The manufacturing method of the safety device provided by the present invention includes a plastic substrate, which comprises a transparent window and an opaque area. The plastic substrate is formed by coating at least one layer of opaque coating on substantially the same areas on the front and back of a transparent plastic substrate, and the areas without the opaque coating form the transparent window of the plastic substrate. Meanwhile, the angle-dependent color-changing ink and / or metallic effect ink is printed on the transparent windows on the front and back of the plastic substrate; further, the angle-dependent color-changing ink and / or metallic effect ink printed on the transparent window can form an overprint with the surrounding opaque coating; further, the angle-dependent color-changing ink and / or metallic effect ink can be extended from the transparent window and printed onto the opaque coating; further, the angle-dependent color-changing ink and / or metallic effect ink printed on the opaque coating forms an overprint with the subsequent opaque coating; further, the angle-dependent color-changing ink and / or metallic effect ink printed on the opaque coating forms an overprint or joint with the subsequent offset printing pattern.

[0143] In the description of this specification, the terms "connection", "installation", "fixation", etc. should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0144] In the description of this specification, the descriptions of the terms "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0145] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A safety device, characterized in that, Comprising: A plastic substrate; A first ink layer, disposed on the front side of the plastic substrate to form front-side graphics; A second ink layer, disposed on the back side of the plastic substrate to form back-side graphics; The front-side graphics and the back-side graphics are printed face-to-face in reverse, and the face-to-face printing in reverse includes complementary face-to-face printing and complete face-to-face printing; Wherein, the first ink layer includes angle-dependent color-changing ink, and the second ink layer includes angle-dependent color-changing ink and / or metallic effect ink; A white coating, angle-dependent color-changing ink and / or metallic effect ink are coated on the plastic substrate to form a plastic base material, the plastic base material includes a transparent window, and the front and back sides of the transparent window are respectively printed with the first ink layer and the second ink layer; The first ink layer and the second ink layer are printed on the front and back sides of the plastic substrate by rotogravure printing; The first ink layer includes the angle-dependent color-changing ink, the second ink layer includes the metallic effect ink, and the angle-dependent color-changing ink and the metallic effect ink are printed face-to-face in reverse; When the angle-dependent color-changing ink is observed at a first viewing angle, its color and / or flashing effect are similar to or the same as those of the metallic effect ink; and / or when the angle-dependent color-changing ink is observed at a second viewing angle, it has a color different from that of the metallic effect ink; The first ink layer includes a first angle-dependent color-changing ink, the second ink layer includes a second angle-dependent color-changing ink, and the first angle-dependent color-changing ink and the second angle-dependent color-changing ink are printed face-to-face in reverse; The first angle-dependent color-changing ink and the second angle-dependent color-changing ink have similar or the same color when observed at a first viewing angle; and / or the first angle-dependent color-changing ink and the second angle-dependent color-changing ink have different colors when observed at a second viewing angle; The first ink layer and the second ink layer are printed in complementary face-to-face in reverse. The first ink layer is printed with a first pattern on the front side, and the second ink layer is printed with a second pattern on the back side. When viewed through the front side or the back side, the first pattern and the second pattern complement each other to form a third pattern; When observed at a first angle, the third pattern formed by the complementation of the first pattern and the second pattern has a consistent appearance and appears as one pattern; When observed at a second angle, the third pattern appears as two patterns.

2. The security device according to claim 1, wherein The first viewing angle includes a front-viewing angle, and the second viewing angle includes a horizontal-viewing angle; Wherein, the front-viewing angle includes an observation angle perpendicular to or close to perpendicular to the first ink layer and / or the second ink layer, and the horizontal-viewing angle includes an observation angle parallel to or close to parallel to the first ink layer and / or the second ink layer.

3. The safety device according to claim 1, wherein The plastic base material further includes an opaque area, and a third ink layer is printed on the opaque area; The third ink layer forms overprinting or jointing with the first ink layer and / or the second ink layer; and / or The opacity of the opaque area is greater than 70%.

4. The security device according to claim 3, wherein The thickness of the plastic base material is greater than or equal to 60 μm and less than or equal to 110 μm; and / or The thickness of the first ink layer and / or the second ink layer is greater than or equal to 2 μm and less than or equal to 10 μm.

5. The security device according to claim 1, wherein the metallic effect ink comprises an aqueous resin, an auxiliary agent, a crosslinking agent, an aqueous nano-color paste, and a metallic effect pigment with an average particle size of 5 μm - 30 μm; the angle-dependent color-changing ink comprises an aqueous resin, an auxiliary agent, a crosslinking agent, an aqueous nano-color paste, and an angle-dependent color-changing pigment with an average particle size of 5 μm - 30 μm.

6. The security device according to claim 5, wherein the metallic effect pigment comprises: a metallic pigment, an effect pigment; and / or the angle-dependent color-changing pigment comprises: a pigment with a multi-layer light interference structure; and / or the aqueous resin comprises: an aqueous acrylic resin, an aqueous polyurethane resin, and an aqueous polyester resin.

7. The security device according to claim 5, wherein the average particle size of the aqueous nano-color paste is 100 nm - 800 nm; the content of the aqueous resin is 40% - 75%; the content of the auxiliary agent is 0.5% - 10%; the content of the metallic effect pigment or the angle-dependent color-changing pigment is 10% - 35%; the content of the crosslinking agent is 1% - 10%.

8. The security device according to claim 1, wherein the tolerance of the front and back graphic sizes formed when the first ink layer and the second ink layer are perfectly printed front to back is less than 1 mm.

9. The security device according to claim 1, wherein the first ink layer and the second ink layer are printed on the front and back surfaces successively through one process; and / or a center positioning structure is provided on the front and back surfaces of the plastic substrate.

10. The safety device according to any one of claims 1, 4 to 9, characterized in that, The first ink layer and the second ink layer are arranged in different microscopic preset grids, and the microscopic preset grids are used for anti-counterfeiting judgment after being magnified.

11. A secure document, characterized in that, Comprising: the security device according to any one of claims 1 to 10.

Images