CN115648832A - Security device and security document - Google Patents

Abstract

The invention provides a security device and a security document, the security device comprising: a plastic substrate; the first ink layer is arranged on the front side of the plastic substrate to form front-side pictures and texts; the second ink layer is arranged on the back of the plastic substrate to form back graphics and texts; front-side and back-side printing of the front-side image-text and the back-side image-text, wherein the front-side and back-side printing comprises front-side and back-side complementary printing and front-side and back-side complete printing; the first ink layer comprises the angle-dependent color-changing ink and/or the metal effect ink, and the second ink layer comprises the angle-dependent color-changing ink and/or the metal effect ink.

Description

Security device and security document

Technical Field

The invention relates to an anti-counterfeiting technology, in particular to a safety device and a safety document.

Background

At present, the development of anti-counterfeiting elements based on plastic substrates described in the related art mostly focuses on the utilization and promotion of the performance of materials and the loading of optical performance elements on the plastic substrates, the anti-counterfeiting capability is weak, and the identification process needs additional instruments and equipment, so that the authenticity identification is troublesome and complicated.

Therefore, how to provide a security device with strong anti-counterfeiting capability, difficult counterfeiting and simple authenticity identification becomes a problem to be solved urgently at present.

Disclosure of Invention

The present invention is directed to a safety device to solve one of the problems of the prior art or the related art.

It is therefore a first object of the present invention to provide a safety device.

A second object of the invention is to provide a security document.

In order to achieve the above object, a first aspect of the present invention provides a safety device, including: a plastic substrate; the first ink layer is arranged on the front side of the plastic substrate to form front side pictures and texts; the second ink layer is arranged on the back of the plastic substrate to form back graphics and texts; front-side and back-side printing of the front-side image-text and the back-side image-text, wherein the front-side and back-side printing comprises front-side and back-side complementary printing and front-side and back-side complete printing; the first ink layer comprises the angle-dependent color-changing ink and/or the metal effect ink, and the second ink layer comprises the angle-dependent color-changing ink and/or the metal effect ink.

According to the invention, a security device is provided comprising a plastic substrate, a first ink layer and a second ink layer. The first printing ink layer is arranged on the front surface of the plastic substrate, the second printing ink layer is arranged on the back surface of the plastic substrate, namely, the first printing ink layer and the second printing ink layer are correspondingly arranged on the front surface and the back surface of the plastic substrate. The first ink layer and the second ink layer can form front-side pictures and texts and back-side pictures and texts on the plastic substrate, the front-side pictures and texts and the back-side pictures and texts are identical in shape and size and are overlapped in arrangement position, front-back complete overprinting can be formed, the front-back complete overprinting refers to the fact that the front and the back are basically completely overlapped and overprinted, the precision of front-back overprinting and printing is extremely high, the error is extremely small, the tolerance is smaller than 1mm, and the optimal tolerance is smaller than 0.5mm. Or the front-side image-text and the back-side image-text can form the front-back complementary overprinting, namely the front-side image-text and the back-side image-text can be spliced to form a complete image-text, so that the anti-counterfeiting effect can be realized by judging whether the image-text is completely overprinted or incompletely overprinted, and the authenticity can be identified without using an instrument. The first ink layer comprises the angle-dependent color-changing ink and/or the metal effect ink, and the second ink layer comprises the angle-dependent color-changing ink and/or the metal effect ink. The angle-dependent heterochromatic printing ink has different colors when being observed at different observation angles, and has a certain metal flicker effect. The metal effect ink has metal luster and a glittering effect. The counterfeiting difficulty of the safety device is further increased through the color change characteristics of the flip-flop ink and the metal effect ink.

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

In addition, the safety device provided by the application can also have the following additional technical characteristics:

in the technical scheme, the first ink layer comprises angle-dependent different-color ink, the second ink layer comprises metal-effect ink, and the angle-dependent different-color ink and the metal-effect ink are printed in a back-to-back mode; when the angle-dependent heterochromatic ink is observed at a first observation angle, the color and/or the flicker effect of the angle-dependent heterochromatic ink are similar to or consistent with those of the metal effect ink; and/or the gonioapparent ink has a different color when viewed at a second viewing angle than the metallic effect ink.

In the technical scheme, the first ink layer is provided with the angle-dependent heterochromatic printing ink, and the second ink layer is provided with the metal effect printing ink, so that the angle-dependent heterochromatic printing ink and the metal effect printing ink are printed in a back-to-back mode. Thus, the color and the glittering effect of the flip-flop ink are similar to or consistent with those of the metallic effect ink when the flip-flop ink is observed at a first observation angle. And/or the gonioapparent ink has a different color when viewed at a second viewing angle than the metallic effect ink. With the arrangement, the difference between the image of the effect ink at the first observation angle and the image of the metal effect ink at the first observation angle can be compared, so that whether the color of the effect ink is correct or not can be judged by using the color of the metal effect ink as a reference during anti-counterfeiting judgment, if the color is correct, the safety device is determined to be true, and if the color is not correct, the safety device is determined to be false. Specifically, the gonioapparent ink has a color that is consistent with the metallic effect ink when viewed at a first viewing angle. The effect ink has a different color when viewed at a second viewing angle than the metallic effect ink. Therefore, the authenticity of the security device can be judged by judging whether the color is correct or not.

In the above technical solution, the first ink layer includes a first optically variable ink, the second ink layer includes a second optically variable ink, and the first optically variable ink and the second optically variable ink are printed back to back; the first angle-dependent heterochromatic ink and the second angle-dependent heterochromatic ink have similar or consistent colors when observed at a first observation angle; and/or the first optically variable ink and the second optically variable ink differ in color when viewed at a second viewing angle.

In this technical scheme, first printing ink layer sets up to first angle of incidence heterochrosis printing ink, and the second printing ink layer sets up to second angle of incidence heterochrosis printing ink, and first angle of incidence heterochrosis printing ink is just back to back with second angle of incidence heterochrosis printing ink. Such that the first optically variable ink and the second optically variable ink are similar or identical in color when viewed at a first viewing angle, and/or the first optically variable ink and the second optically variable ink are different in color when viewed at a second viewing angle. Therefore, the ink on the two sides can form a more obvious reference, and the ink is prevented from forming difference, so that the colors printed on the front side and the back side can be closer. By observing the safety device at different observation angles, different color effect differences can be observed to serve as the basis for anti-counterfeiting judgment.

In any of the above aspects, the first viewing angle comprises a head-up angle, and the second viewing angle comprises a head-up angle; wherein the normal viewing angle comprises a viewing angle that is perpendicular or nearly perpendicular to the first ink layer and/or the second ink layer, and the head-up angle comprises a viewing angle that is parallel or nearly parallel to the first ink layer and/or the second ink layer.

In this aspect, the first viewing angle comprises a head-up angle and the second viewing angle comprises a head-up angle. Wherein the front view angle comprises a viewing angle approximately perpendicular to the first ink layer and/or the second ink layer, and the head-up angle comprises a viewing angle approximately parallel to the first ink layer and/or the second ink layer. Of course, the specific front viewing angle and the flat viewing angle are not limited thereto, and it can be demonstrated that there are different viewing effects when viewed from two different angles.

In the present invention, near vertical means that the angle of observation is from 0 to 15 degrees from the perpendicular to the surface of the plastic substrate, and near parallel means that the angle of observation is from 0 to 30 degrees from the horizontal to the substrate.

In order to further evaluate the color closeness degree of the angle-dependent color-changing ink, the metal effect ink and the two kinds of angle-dependent color-changing inks at a first observation angle, a BYK-mac multi-angle color measuring instrument is used for testing the color and the flicker degree of an ink scratch sample, the Lch value tested by the instrument at 15 degrees represents the color of the ink at the head-up state, and the Lch value tested by the instrument at 45 degrees represents the color of the ink at the direct-view state. Sg15 indicates the degree of ink glitter. When the two inks are close in color, in order to increase the matching degree of the appearance effects of the two inks, the difference delta h of the h values tested by an instrument is preferably less than 15, and the delta h is more preferably less than 10. The difference Δ Sg15 between the degrees of flicker Sg15 of the two inks is less than 2, Δ Sg15 more preferably less than 1.

In the technical scheme, a plastic substrate is formed by coating a white coating, angle-dependent heterochromatic ink and/or metal effect ink on a plastic substrate, the plastic substrate comprises a transparent window and an opaque area, a first ink layer and a second ink layer are respectively printed on the front surface and the back surface of the transparent window, and a third ink layer is printed on the opaque area; the third ink layer forms overprint or wiring with the first ink layer and/or the second ink layer.

In this technical scheme, at plastics basement coating white coating and metallic effect printing ink formation plastics substrate, the plastics substrate includes transparent window and opaque region, and the front and back of transparent window is printed respectively with first printing ink layer and second printing ink layer, and opaque region printing has the third printing ink layer. The first ink layer and the second ink layer form front-back opposite printing, and the front-back complete opposite printing or the front-back complementary opposite printing is included. Further, the first ink layer and/or the second ink layer forms an overprint with the opaque coating. Furthermore, the first ink layer and the second ink layer extend from the transparent window to the opaque area, and the opaque coating and the first ink layer and/or the second ink layer form overprinting or wiring. This kind of setting directly prints first printing ink layer and second printing ink layer on transparent window, when making things convenient for both sides to form the front and back to the seal, mutual reference to this machining precision that can improve the front and back to the seal. And the first ink layer and the second ink layer which are printed in a front-back opposite mode extend to the opaque area from the transparent window, the opaque coating and the first ink layer and/or the second ink layer form overprinting or wiring, or the third ink layer and the first ink layer and/or the second ink layer form overprinting or wiring. Overprinting or wiring can be formed on the opaque area, so that the anti-counterfeiting mark can be formed through the overprinting or wiring, the safety of the safety device can be improved, and the counterfeiting difficulty is increased.

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

In the technical scheme, the thickness of the plastic base material is more than or equal to 60 micrometers and less than or equal to 110 micrometers; and/or the thickness of the first ink layer and/or the second ink layer is more than or equal to 2 μm and less than or equal to 10 μm.

In the technical scheme, the thickness of the plastic base material is more than or equal to 60 mu m and less than or equal to 110 mu m; 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. The thickness of the plastic substrate, the first ink layer and the second ink layer is moderate, the front and back printing can be conveniently formed, and the anti-counterfeiting effect is improved.

In the technical scheme, the first ink layer and the second ink layer are printed in a front-back complementary mode, the first ink layer is printed on the front face in a first pattern, the second ink layer is printed on the back face in a second pattern, and the first pattern and the second pattern are complementary to form a third pattern when the front face or the back face is observed in a perspective mode; when observed at a first angle, a third pattern formed by the complementation of the first pattern and the second pattern is consistent in appearance and represents a pattern; the third pattern appears as two patterns when viewed at the second angle.

In the technical scheme, the first ink layer and the second ink layer are printed in a front-back complementary mode, the first ink layer is printed on the front side in a first pattern, the second ink layer is printed on the back side in a second pattern, and the first pattern and the second pattern are complementary to form a third pattern when the front side or the back side is viewed in a perspective mode. Whether the patterns arranged on the two sides of the safety device are complementary or whether the patterns are consistent or not is observed, the authenticity of the safety device can be judged, and the difficulty of counterfeiting the safety device is further improved.

In the technical scheme, the metal effect ink comprises water-based resin, an auxiliary agent, a cross-linking agent, water-based nano color paste and metal effect pigment with the average particle size of 5-30 mu m.

In the technical scheme, the metal effect ink comprises water-based resin, an auxiliary agent, a cross-linking agent, water-based nano color paste and metal effect pigment with the average particle size of 5-30 mu m. Through setting up metallic effect printing ink to including above-mentioned material, can make metallic effect printing ink present good metal scintillation effect and printability to increased the degree of difficulty of being forged.

Further, the average particle diameter of the metallic effect pigment is preferably 10 μm to 25 μm.

In the technical scheme, the angle-dependent heterochromatic ink comprises water-based resin, an auxiliary agent, a cross-linking agent, water-based nano color paste and angle-dependent heterochromatic pigment with the average particle size of 5-30 mu m.

In the technical scheme, the angle-dependent heterochromatic ink comprises water-based resin, an auxiliary agent, a cross-linking agent, water-based nano color paste and angle-dependent heterochromatic pigment with the average particle size of 5-30 mu m. By setting the angle-dependent heterochromatic printing ink to comprise the materials, the angle-dependent heterochromatic printing ink can have good color change and metal flicker effects, has good printability and increases the difficulty of counterfeiting.

Further, the effect pigment preferably has an average particle diameter of 10 μm to 25 μm.

In the above technical solution, the metallic effect pigment includes: metallic pigments, effect pigments.

In this embodiment, the metallic effect pigments can be metallic pigments and effect pigments. The metal pigment comprises copper-zinc alloy powder and aluminum powder, commonly known as gold powder and silver powder, wherein the different proportions of copper and zinc can prepare metal colors with different hues, such as red gold, bronze and the like. The effect pigment is obtained by coating one or more layers of high-reflectivity metal oxides on glass, synthetic mica or alumina (corundum) serving as a base material by a precise coating technology on the basis of the traditional mica titanium pearlescent pigment. By controlling the type and the coating thickness of the metal oxide, a series of interference colors such as golden color, bronze color, red golden color and the like can be obtained.

In the above technical solution, the effect pigment includes: pigments of multilayer optical interference structures.

In this embodiment, the effect pigment can be a multilayer optical interference structured pigment. The color-dependent variable material is prepared by a Physical Vapor Deposition (PVD) method or a wet chemical method, and can obtain obvious angle-dependent color variation phenomenon by selecting metal oxide with proper refractive index and proper thickness. Since the refractive index of the cladding material is different from that of the substrate material (optical interference effect), the pigment can show obvious color change characteristics when observed at two different angles of front view and glancing view (the principle is based on the optical interference effect). For example, one color when viewed at about a vertical angle and a second color when viewed at about a head-up angle.

In the above technical solution, the aqueous resin includes: aqueous acrylic resins, aqueous polyurethane resins and aqueous polyester resins.

In this embodiment, the aqueous resin may be an aqueous acrylic resin, an aqueous urethane resin, an aqueous polyester resin, or the like, but of course, the aqueous resin may be other resins, and the specific resin may be set according to actual needs.

In the technical scheme, the average particle size of the aqueous nano color paste is 100nm-800nm, and the content of the aqueous nano color paste is 0-8%; the content of the water-based resin is 40-75 percent; the content of the auxiliary agent is 0.5 to 10 percent; the content of the metallic effect pigment or the angle-dependent color pigment is 10 to 35 percent; the content of the cross-linking agent is 1-10%.

In the technical scheme, the average particle size of the aqueous nano color paste is 100nm-800nm, 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%, and the content of the metal effect pigment or the angle-dependent heterochromatic pigment is 10-35%; the content of the cross-linking agent is 1-10%. Through the proportion setting of above-mentioned material, both can guarantee metallic effect printing ink or angle following heterochrosis printing ink outward appearance colour, do not influence printing ink metal scintillation effect again, can make safety device more difficult by the imitative.

Further, the content of the aqueous nano color paste is preferably 2-6%.

In the technical scheme, the tolerance of the sizes of the front and back images formed when the front and back surfaces of the first ink layer and the second ink layer are completely printed is less than 1mm.

In this technical scheme, the tolerance of the picture and text size that first printing ink layer and second printing ink layer formed the positive back and completely to the seal is less than 1mm, and first printing ink layer and second printing ink layer formed the positive back and completely to the seal, and the shape of positive picture and text and back picture and text is the same, the size is the same promptly, set up the position coincidence for first printing ink layer and second printing ink layer are positive back to the more accurate of seal, also can increase the degree of difficulty of imitative.

Further, preferably, the tolerance of the sizes of the front and back images formed when the front and back surfaces of the first ink layer and the second ink layer are completely printed with each other is less than 0.5mm.

In above-mentioned technical scheme, first printing ink layer and second printing ink layer pass through the printing of rotogravure on the obverse and reverse sides of plastics substrate.

In the technical scheme, the first ink layer and the second ink layer are printed on the front surface and the back surface of the plastic substrate through rotogravure. And the front surface and the back surface are accurately printed by adopting rotary gravure through high-precision printing. The accurate counterprint is as a printing anti-fake technology, and difficult realization especially has extremely high requirement to printing positioning accuracy in large-scale continuous printing technology, has greatly increased the degree of difficulty of forging.

In the technical scheme, the front and back sides of the first ink layer and the second ink layer are printed successively by one-time process.

In this technical scheme, first printing ink layer and second printing ink layer are successively accomplished the front and back printing through a technology, compare in carrying out many times technology, and a technology can make first printing ink layer and second printing ink layer printing more accurate, can form complete front and back to seal.

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

In the technical scheme, the front surface and the back surface of the plastic substrate are provided with the center positioning structures, so that the center alignment is performed when the printing is convenient, and the complete front-back opposite printing can be formed.

In the above technical scheme, the covering power of the first ink layer and the second ink layer is greater than 50%.

In the technical scheme, the covering power of the first ink layer and the second ink layer is larger than 50%, the mutual influence of metal effect ink and angle-dependent heterochromatic ink in front-back printing can be avoided, and the printing effect is improved.

In the technical scheme, the first ink layer and the second ink layer are arranged in different microcosmic preset grids, and the microcosmic preset grids are used for anti-counterfeiting judgment after being amplified.

In this technical scheme, first printing ink layer and second printing ink layer are the setting of the grid of predetermineeing that is the microcosmic form of difference, and the setting of predetermineeing the grid naked eye of microcosmic form is invisible, and is visible after enlarging the predetermined multiple to can be used for anti-fake judgement after enlarging the predetermined grid of microcosmic form, further increased anti-fake effect.

The technical solution of the second aspect of the present invention provides a security document, including: the safety device according to any of the aspects of the first aspect.

The security document provided by the invention comprises the security device in any technical scheme of the first aspect. Therefore, the security document provided by the present invention also has all the advantages of the security device in any one of the technical solutions of the first aspect, and is not described herein again.

A third aspect of the present invention provides a method of manufacturing a safety device, the safety device including: the plastic substrate comprises a transparent window and an opaque area. The manufacturing method comprises the following steps: at least one opaque coating is applied to substantially the same area of the front and back surfaces of the transparent plastic substrate, with the area not coated with the opaque coating forming a transparent window in the plastic substrate. Meanwhile, the flip-flop ink and/or the metal effect ink are printed on the transparent windows on the front and back surfaces of the plastic substrate; further, the effect ink and/or metallic effect ink printed on the transparent window can form overprint with the peripheral opaque coating; further, the effect ink and/or the metal effect ink may be extended from the transparent window to be printed onto the opaque coating; further, the effect ink and/or the metal effect ink printed on the opaque coating forms an overprint with a subsequent opaque coating; further, the effect ink and/or metallic effect ink printed on the opaque coating forms an overprint or wiring with the subsequent offset printed pattern.

The method for manufacturing the safety device comprises a plastic base material, wherein the plastic base material comprises a transparent window and an opaque area. The plastic substrate is formed by coating at least one opaque coating on substantially the same area of the front and back surfaces of the transparent plastic substrate, the area not coated with the opaque coating forming a transparent window of the plastic substrate. Meanwhile, the flip-flop ink and/or the metal effect ink are printed on the transparent windows on the front surface and the back surface of the plastic substrate; further, the effect ink and/or the metallic effect ink printed on the transparent window can form overprinting with the peripheral opaque coating; further, the effect ink and/or the metal effect ink may be extended from the transparent window to be printed onto the opaque coating; further, the effect ink and/or the metallic effect ink printed on the opaque coating forms an overprint with a subsequent opaque coating; further, the effect ink and/or metallic effect ink printed on the opaque coating forms an overprint or wiring with the subsequent offset printed pattern.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a front view of a security device according to one embodiment of the present invention, with the front and back fully printed against each other;

FIG. 2 is a top view of FIG. 1 according to an embodiment of the present invention;

FIG. 3 is a schematic view from the perspective of front-to-back complementary printing according to one embodiment of the present invention;

FIG. 4 is a schematic illustration of the front pattern of FIG. 3 according to one embodiment of the invention;

fig. 5 is a schematic diagram of the backside pattern of fig. 1 according to an embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 5 is:

1 second printing ink layer, 2 plastic substrate, 3 opaque region, 4 first printing ink layer, 5 third printing ink layer, 6 transparent window.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention, taken in conjunction with the accompanying drawings and detailed description, is set forth below. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein and, therefore, the scope of the present invention is not limited by the specific embodiments disclosed below.

A security device provided according to an embodiment of the present invention is described below with reference to fig. 1 to 5.

Example one

As shown in fig. 1 and 2, a first embodiment of a first aspect of the invention provides a security device comprising a plastic substrate 2, a first layer of ink 4 and a second layer of ink 1. The first ink layer 4 is arranged on the front side of the plastic substrate 2 to form a front image and text. The second ink layer 1 is arranged on the back surface of the plastic substrate 2 to form back surface pictures and texts; the front image-text and the back image-text are completely printed in a front-back mode. The first ink layer 4 includes an angle dependent color ink and/or a metal effect ink, and the second ink layer 1 includes an angle dependent color ink and/or a metal effect ink.

According to the present invention there is provided a security device comprising a plastic substrate 2, a first ink layer 4 and a second ink layer 1. First printing ink layer 4 sets up in the front of plastics base 2, and second printing ink layer 1 sets up at the back of plastics base 2, and promptly, first printing ink layer 4 corresponds the setting at the tow sides of plastics base 2 with second printing ink layer 1. First printing ink layer 4 and second printing ink layer 1 can form front picture and text and back picture and text on plastics basement 2, the shape of front picture and text and back picture and text is the same, the size is the same, it coincides to set up the position, can form the complete reprint of the front back, or front picture and text and back picture and text can form the complete reprint of the front back, namely front picture and text and back picture and text can splice and form a complete picture and text, thereby can be through judging whether the picture and text is just carried out the reprint completely and is prevented falsification, need not to distinguish true and false with the help of the instrument, technical personnel in the art can know is, metallic effect printing ink or angle following heterochromatic printing ink are just carried out the complete reprint or just carry out the complementation and is relatively difficult to realize, consequently, can be used for preventing falsification, anti-fake effect has been improved. Wherein, first printing ink layer 4 includes angle of incidence heterochrosis printing ink and/or metallic effect printing ink, and second printing ink layer 1 includes angle of incidence heterochrosis printing ink and/or metallic effect printing ink, and angle of incidence heterochrosis printing ink has different colours when different observation angles are observed, and through the colour change characteristic of angle of incidence heterochrosis printing ink and metallic effect printing ink, the degree of difficulty that the safety device was forged has further been increased.

Further, the plastic substrate 2 includes one of biaxially oriented polypropylene, polycarbonate, PET, PE, PVC, paper-plastic composite, and the like.

In the above embodiment, the first ink layer 4 includes the optically variable ink, the second ink layer 1 includes the metal effect ink, and the optically variable ink and the metal effect ink are printed in a back-to-back manner; when the angle-dependent heterochromatic ink is observed at a first observation angle, the color and the flicker effect of the angle-dependent heterochromatic ink are similar to or consistent with those of the metal effect ink; and/or the gonioapparent ink has a different color when viewed at a second viewing angle than the metallic effect ink.

In this embodiment, the first ink layer 4 is provided with the optically variable ink, and the second ink layer 1 is provided with the metal effect ink, so that the optically variable ink and the metal effect ink are printed in a back-to-back manner. Thus, the color and the glittering effect of the flip-flop ink are similar to or consistent with those of the metallic effect ink when the flip-flop ink is observed at a first observation angle. And/or the gonioapparent ink has a different color when viewed at a second viewing angle than the metallic effect ink. With this arrangement, the difference between the image of the optically variable ink at the first observation angle and the image of the metallic effect ink at the first observation angle can be compared, and whether the color of the optically variable ink is correct or not can be determined based on the color of the metallic effect ink in the anti-counterfeit determination. Specifically, the gonioapparent ink has a color that is consistent with the metallic effect ink when viewed at a first viewing angle. The effect ink has a different color when viewed at a second viewing angle than the metallic effect ink. Therefore, the authenticity of the security device can be judged by judging whether the color is correct or not.

In the above embodiment, the first ink layer 4 includes the first optically variable ink, the second ink layer 1 includes the second optically variable ink, and the first optically variable ink and the second optically variable ink are printed in a back-to-back manner; the first angle-dependent heterochromatic ink and the second angle-dependent heterochromatic ink have similar or consistent colors when observed at a first observation angle; and/or the first and second optically variable inks differ in color when viewed at a second viewing angle.

In this embodiment, the first ink layer 4 is provided as a first optically variable ink, the second ink layer 1 is provided as a second optically variable ink, and the first optically variable ink and the second optically variable ink are printed in a back-to-back manner. The first ink and the second ink have similar or identical colors when observed at a first observation angle, and/or the first ink and the second ink have different colors when observed at a second observation angle. Therefore, the ink on the two sides can form a more obvious reference, and the ink is prevented from forming difference, so that the colors printed on the front side and the back side can be closer. By observing the safety device at different observation angles, different color effect differences can be observed to be used as a basis for anti-counterfeiting judgment.

In any of the above embodiments, the first viewing angle comprises a head-up angle and the second viewing angle comprises a head-up angle; wherein the front view angle comprises a viewing angle approximately perpendicular to first ink layer 4 and/or second ink layer 1, and the head-up angle comprises a viewing angle approximately parallel to first ink layer 4 and/or second ink layer 1.

In this embodiment, the first viewing angle comprises a head-up angle and the second viewing angle comprises a head-up angle. Wherein the front view angle comprises a viewing angle approximately perpendicular to first ink layer 4 and/or second ink layer 1, and the head-up angle comprises a viewing angle approximately parallel to first ink layer 4 and/or second ink layer 1. Of course, the specific front viewing angle and the flat viewing angle are not limited thereto, and it can be demonstrated that there are different viewing effects when viewed from two different angles.

In the invention, nearly perpendicular means that the angle between the observation angle and the perpendicular line of the surface of the substrate is 0-15 degrees, and nearly parallel means that the angle between the observation angle and the horizontal line of the substrate is 0-30 degrees.

In order to further evaluate the color closeness degree of the angle-dependent color-changing ink, the metal effect ink and the two kinds of angle-dependent color-changing inks at a first observation angle, a BYK-mac multi-angle color measuring instrument is used for testing the color and the flicker degree of an ink scratch sample, the Lch value tested by the instrument at 15 degrees represents the color of the ink at the head-up state, and the Lch value tested by the instrument at 45 degrees represents the color of the ink at the direct-view state. Sg15 indicates the degree of ink glitter. When the two inks are close in color, in order to increase the matching degree of the appearance effects of the two inks, the difference value delta h of h values measured by an instrument is preferably less than 15, and delta h is more preferably less than 10. The difference Δ Sg15 between the degrees of glitter Sg15 of the two inks is less than 2, and Δ Sg15 is more preferably less than 1.

In the above embodiment, a plastic substrate is formed by coating a white coating, a color-dependent ink and/or a metal effect ink on a plastic substrate 2, the plastic substrate includes a transparent window 6 and an opaque region 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 region 3; the third ink layer 5 forms an overprint or wiring with the first ink layer 4 and/or the second ink layer 1.

In this embodiment, a plastic substrate is formed by coating a white coating, a color-dependent ink and/or a metal effect ink on a plastic substrate 2, the plastic substrate includes a transparent window 6 and an opaque region 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, and a third ink layer 5 is printed on the opaque region 3. The first ink layer 4 and the second ink layer 1 form front-back opposite printing, including front-back complete opposite printing or front-back complementary opposite printing. Further, the first ink layer 4 and/or the second ink layer 1 forms an overprint with the opaque coating. Furthermore, the first ink layer 4 and the second ink layer 1 extend from the transparent window 6 to the opaque region 3, and the opaque coating forms an overprint or a wiring with the first ink layer 4 and/or the second ink layer 1. This kind of setting directly prints first printing ink layer 4 and second printing ink layer 1 on transparent window 6, when making things convenient for both sides to form the front and back to the seal, the cross reference to this machining precision that can improve the front and back to the seal. And the first ink layer 4 and the second ink layer 1 which are right opposite to each other are extended to the opaque area 3 from the transparent window 6, the opaque coating and the first ink layer 4 and/or the second ink layer 1 form overprinting or wiring, or the third ink layer 5 and the first ink layer 4 and/or the second ink layer 1 form overprinting or wiring. Overprinting or wiring can be formed on the opaque region 3, so that the anti-counterfeiting mark can be formed through the overprinting or wiring, the safety of the safety device can be improved, and the counterfeiting difficulty is increased.

In the above embodiment, the hiding power of the opaque region 3 is greater than 70%.

In the above embodiment, the thickness of the plastic base material is 60 μm or more and 110 μm or less; 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.

In this embodiment, the thickness of the plastic base material is 60 μm or more and 110 μm or less; and/or the thickness of the first ink layer 4 and/or the second ink layer 1 is 2 μm or more and 10 μm or less. Make the thickness of plastics substrate, first printing ink layer 4 and second printing ink layer 1 moderate, can be convenient for form just back to back the seal, promote anti-fake effect.

In the above embodiment, the first ink layer 4 and the second ink layer 1 are printed in a front-back complementary manner, the first ink layer 4 is printed on the front surface in a first pattern, the second ink layer 1 is printed on the back surface in a second pattern, and the first pattern and the second pattern are complementary to form a third pattern when the front surface or the back surface is viewed in a perspective manner; when observed at a first angle, a third pattern formed by the complementation of the first pattern and the second pattern is consistent in appearance and represents a pattern; the third pattern appears as two patterns when viewed at the second angle.

In this embodiment, the first ink layer 4 and the second ink layer 1 are printed in a front-back complementary manner, the first ink layer 4 is printed on the front surface in a first pattern, the second ink layer 1 is printed on the back surface in a second pattern, and the first pattern and the second pattern are complementary to form a third pattern when the front surface or the back surface is viewed in a perspective manner. Whether the patterns arranged on the two sides of the safety device are complementary or whether the patterns are consistent or not is observed, the authenticity of the safety device can be judged, and the difficulty of counterfeiting the safety device is further improved.

In the above embodiment, the metallic effect ink comprises an aqueous resin, an auxiliary agent, a cross-linking agent, an aqueous nano color paste and a metallic effect pigment with an average particle size of 5 μm to 30 μm.

In this embodiment, the metallic effect ink includes an aqueous resin, an auxiliary agent, a cross-linking agent, an aqueous nano-paste, and a metallic effect pigment having an average particle size of 5 μm to 30 μm. Through setting up metallic effect printing ink to including above-mentioned material, can make metallic effect printing ink present good metal scintillation effect and printability to increased the degree of difficulty of being forged.

Further, the average particle diameter of the metallic effect pigment is preferably 10 μm to 25 μm.

In the above embodiment, the effect ink comprises water-based resin, auxiliary agent, cross-linking agent, water-based nano color paste and effect pigment with average particle size of 5 μm-30 μm.

In the embodiment, the angle-dependent heterochromatic ink comprises water-based resin, an auxiliary agent, a cross-linking agent, water-based nano color paste and angle-dependent heterochromatic pigment with the average particle size of 5-30 mu m. By arranging the angle-dependent heterochromatic printing ink to comprise the material, the angle-dependent heterochromatic printing ink can have good color change and metal flicker effects, has good printability and increases the difficulty of counterfeiting.

Further, the effect pigment preferably has an average particle diameter of 10 μm to 25 μm.

In the above embodiments, the metallic effect pigment comprises: metallic pigments, effect pigments.

In this embodiment, the metallic effect pigments may be metallic pigments and effect pigments. The metal pigment comprises copper-zinc alloy powder and aluminum powder, commonly known as gold powder and silver powder, wherein the different proportions of copper and zinc can prepare metal colors with different hues, such as red gold, bronze and the like. The effect pigment is obtained by coating one or more layers of high-reflectivity metal oxides on glass, synthetic mica or alumina (corundum) serving as a base material by a precise coating technology on the basis of the traditional mica titanium pearlescent pigment. By controlling the type and coating thickness of the metal oxide, a series of interference colors such as golden color, bronze color, red golden color and the like can be obtained.

In the above embodiments, the effect pigment comprises: pigments of multilayer optical interference structures.

In this embodiment, the effect pigment may be a multilayer light interference structured pigment. The color-dependent variable material is prepared by a Physical Vapor Deposition (PVD) method or a wet chemical method, and can obtain obvious angle-dependent color variation phenomenon by selecting metal oxide with proper refractive index and proper thickness. Since the refractive index of the cladding material is different from that of the substrate material (optical interference effect), the pigment can show obvious color change characteristics when observed at two different angles of front view and glancing view (the principle is based on the optical interference effect). For example, one color when viewed at about a vertical angle and a second color when viewed at about a head-up angle.

In the above embodiment, the aqueous resin includes: waterborne acrylic resin, waterborne polyurethane resin and waterborne polyester resin.

In this embodiment, the aqueous resin may be an aqueous acrylic resin, an aqueous polyurethane resin, an aqueous polyester resin, or the like, but the aqueous resin may be other resins, and the specific resin may be set according to actual needs.

In the embodiment, the average grain diameter of the aqueous nano color paste is 100nm-800nm, and the content of the aqueous nano color paste is 0-8%; the content of the water-based resin is 40-75 percent; the content of the auxiliary agent is 0.5 to 10 percent; the content of the metallic effect pigment or the angle-dependent color pigment is 10 to 35 percent; the content of the cross-linking agent is 1-10%.

In the embodiment, the average particle size of the aqueous nano color paste is 100nm-800nm, 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%, and the content of the metal effect pigment or the angle dependent heterochromatic pigment is 10-35%; the content of the cross-linking agent is 1-10%. Through the proportion setting of above-mentioned material, both can guarantee metallic effect printing ink or angle following heterochrosis printing ink outward appearance colour, do not influence printing ink metal scintillation effect again, can make safety device more difficult by the imitative.

Further, the content of the water-based nano color paste is preferably 2% -6%.

In the above embodiment, the tolerance of the sizes of the front and back images formed when the front and back surfaces of the first ink layer 4 and the second ink layer 1 are completely printed with each other is less than 1mm.

In this embodiment, the tolerance of the size of the front-back completely-printed image-text formed by the first ink layer 4 and the second ink layer 1 is smaller than 1mm, and the front-back completely-printed image-text formed by the first ink layer 4 and the second ink layer 1 is the same in shape, the same in size, and the same in arrangement position, so that the front-back completely-printed image-text formed by the first ink layer 4 and the second ink layer 1 is more accurate, and the difficulty in copying can be increased.

Further, it is preferable that the tolerance of the sizes of the front and back images formed when the first ink layer 4 and the second ink layer 1 are completely printed on the front and back sides is less than 0.5mm.

In the above embodiment, the first ink layer 4 and the second ink layer 1 are printed on both front and back sides of the plastic substrate 2 by rotogravure.

In this embodiment, first ink layer 4 and second ink layer 1 are rotogravure printed on both front and back sides of plastic substrate 2. And the front surface and the back surface are accurately printed by adopting rotary gravure through high-precision printing. The accurate counterprint is as a printing anti-fake technology, and difficult realization especially has extremely high requirement to printing positioning accuracy in large-scale continuous printing technology, has greatly increased the degree of difficulty of forging.

In the above embodiment, the first ink layer 4 and the second ink layer 1 are printed on the front and back sides sequentially by one process.

In this embodiment, the first ink layer 4 and the second ink layer 1 successively complete front-back printing through one process, and compared with multiple processes, one process can enable the first ink layer 4 and the second ink layer 1 to be printed more accurately, and complete front-back opposite printing can be formed.

In the above embodiment, the center positioning structure is provided on the front and back surfaces of the plastic base 2.

In this embodiment, the front and back surfaces of the plastic substrate 2 are provided with centering structures to facilitate centering during printing, so that complete front-to-back printing can be formed.

In the above embodiment, the first ink layer 4 and the second ink layer 1 are arranged in different microscopic preset grids, and the microscopic preset grids are used for anti-counterfeiting judgment after being amplified.

In this embodiment, first printing ink layer 4 and second printing ink layer 1 are the setting of the predetermined grid that is the microcosmic form of difference, and the predetermined grid of microcosmic form is invisible to the naked eye, and is visible after enlarging predetermined multiple to can be used for anti-fake judgement after enlarging the predetermined grid of microcosmic form, further increased anti-fake effect.

Example two

In a second embodiment of the first aspect of the invention, there is provided a security device which is a front-to-back full-on-demand security device, wherein a first ink layer 4 of a plastic substrate 2 is printed with a metallic effect ink, and the metallic effect ink is a green-to-gold ink, and a second ink layer 1 of the plastic substrate 2 is printed with a green-to-blue flop ink. The green-gold effect was observed from the side on which the green-gold ink was printed. When viewed from the side of the printed green-to-blue effect ink, the ink is seen as green-to-gold effect, and when viewed from the side, the ink is seen as blue.

Further, the printing thickness of the metallic effect ink and the effect ink was 4 μm, and the thickness of the plastic substrate was 80 μm.

Further, the metal effect ink comprises water-based acrylic resin, water-based polyurethane resin, an auxiliary agent, a metal effect pigment with the average particle size of 18 mu m, a cross-linking agent and water-based nano color paste. The angle-dependent heterochromatic ink comprises water-based acrylic resin, water-based polyurethane resin, an auxiliary agent, an angle-dependent heterochromatic effect pigment with the average particle size of 16 mu m, a cross-linking agent and water-based nano color paste.

Furthermore, in the metal effect printing ink, the average grain diameter of the water-based nano color paste is 500nm, the water-based nano color paste is green, and the content is 6 percent. The content of the aqueous acrylic resin and the aqueous polyurethane resin is 50%. The content of the auxiliary agent is 8 percent. The content of the metallic effect pigment is 30%. The content of the crosslinking agent was 6%. In the angle-dependent heterochromatic ink, the average grain diameter of the water-based nano color paste is 500nm, and the water-based nano color paste is green and has the content of 2 percent. The content of the aqueous acrylic resin and the aqueous polyurethane resin is 50%. The content of the auxiliary agent is 8 percent. The content of the effect pigment is 30 percent. The content of the crosslinking agent was 6%. The test results of the multi-angle colorimeter are shown in the following table 1:

TABLE 1

Where L in table 1 represents luminance, c represents saturation, and h represents color.

The color difference Δ h measured at 45 ° for both inks was 8.58. The glittering degree Sg15 of the green-gold ink is 5.6, the glittering degree Sg15 of the green-to-blue angle-dependent color-changing ink is 6.5, and the glittering degree difference delta Sg15 of the two inks is 0.9.

EXAMPLE III

In a third embodiment of the first aspect of the invention, there is provided a security device in which the front and back sides of the security device are completely printed against each other, the first ink layer 4 of the plastic substrate 2 being printed with a gold ink and the second ink layer 1 of the plastic substrate 2 being printed with a red gold ink. The golden effect is observed on the first ink layer 4 side, and the red golden effect is observed on the second ink layer 1 side.

Further, the printing thickness of the metallic effect ink and the effect ink was 3 μm, and the thickness of the plastic substrate was 75 μm.

Example four

A fourth embodiment of the first aspect of the invention provides a security device which is a front-to-back fully printable security device in which a green to blue flop is printed on the first ink layer 4 of the plastic substrate 2 and a green to magenta flop is printed on the second ink layer 1 of the plastic substrate 2. The green-to-blue flop ink and the green-to-magenta flop ink are both green when viewed from a front perspective. The two inks have obvious difference in color when viewed in a flat view.

Further, the printing thickness of the two effect inks was 7 μm, and the thickness of the plastic substrate was 85 μm.

Further, the optically variable ink comprises an aqueous grease, an auxiliary agent, an optically variable pigment with an average particle size of 16 μm, and a crosslinking agent.

Furthermore, the average grain diameter of the water-based nano color paste is 300nm, and the content of the water-based nano color paste is 7 percent. The content of the water-based resin is 49%. The content of the auxiliary agent is 9 percent. The test results of the multi-angle color measuring instrument are as follows

Table 2:

TABLE 2

Where L in table 2 represents luminance, c represents saturation, and h represents color.

The 45 ℃ test color difference Δ h of the two inks was 1.94. The glitter degree Sg15 of the green-to-magenta angle-dependent color-changing ink is 5.9, the glitter degree Sg15 of the green-to-blue angle-dependent color-changing ink is 6.5, and the difference delta Sg15 of the glitter degrees of the two inks is 0.6.

EXAMPLE five

As shown in fig. 3, 4 and 5, a fifth embodiment of the first aspect of the invention provides a security device which is a front and back complementary reverse printed security device, the front view being one pattern, the front view being two patterns, and the two patterns being complementary to form a new pattern. The first ink layer 4 is printed with the green-to-blue flip-flop ink, and the second ink layer 1 is printed with the green metal effect ink. The first ink layer 4 and the second ink layer 1 respectively present a pattern, and the color of the pattern of the first ink layer 4 and the second ink layer 1 is green when the patterns are observed directly, so that a new pattern is presented. The two inks are different in color when viewed at head-up, and exhibit two patterns.

An embodiment of a second aspect of the invention provides a security document comprising: the safety device of any embodiment of the first aspect.

The security document provided by the present invention comprises the security device of 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 embodiment of the first aspect, which are not described herein again.

An embodiment of a third aspect of the invention provides a method of manufacturing a security device, the security device comprising: the plastic substrate comprises a transparent window and an opaque area. The manufacturing method comprises the following steps: at least one opaque coating is applied to substantially the same area of the front and back surfaces of the transparent plastic substrate, with the area not coated with the opaque coating forming a transparent window in the plastic substrate. Meanwhile, the flip-flop ink and/or the metal effect ink are printed on the transparent windows on the front surface and the back surface of the plastic substrate; further, the effect ink and/or metallic effect ink printed on the transparent window can form overprint with the peripheral opaque coating; further, the effect ink and/or the metal effect ink may be extended from the transparent window to be printed onto the opaque coating; further, the effect ink and/or the metal effect ink printed on the opaque coating forms an overprint with a subsequent opaque coating; further, the effect ink and/or metallic effect ink printed on the opaque coating forms an overprint or wiring with the subsequent offset printed pattern.

The method for manufacturing the safety device comprises a plastic base material, wherein the plastic base material comprises a transparent window and an opaque area. The plastic base material is formed by coating at least one opaque coating layer on approximately the same area of the front surface and the back surface of the transparent plastic base, and the area which is not coated with the opaque coating layer forms a transparent window of the plastic base material. Meanwhile, the flip-flop ink and/or the metal effect ink are printed on the transparent windows on the front surface and the back surface of the plastic substrate; further, the effect ink and/or metallic effect ink printed on the transparent window can form overprint with the peripheral opaque coating; further, the effect ink and/or the metal effect ink may be extended from the transparent window to be printed onto the opaque coating; further, the effect ink and/or the metal effect ink printed on the opaque coating forms an overprint with a subsequent opaque coating; further, the effect ink and/or metallic effect ink printed on the opaque coating forms an overprint or wiring with the subsequent offset printed pattern.

In the description of the present specification, the terms "connect", "mount", "fix", and the like are to be understood broadly, for example, "connect" may be a fixed connection, a detachable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present specification, the description of "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (14)

1. A security device, comprising:

a plastic substrate;

the first ink layer is arranged on the front side of the plastic substrate to form front side pictures and texts;

the second ink layer is arranged on the back surface of the plastic substrate to form back surface pictures and texts;

the front face image-text and the back face image-text are printed in a front-back mode, and the front-back printing comprises front-back complementary printing and front-back complete printing;

the first ink layer comprises the flip-flop ink and/or the metal effect ink, and the second ink layer comprises the flip-flop ink and/or the metal effect ink.

2. The safety device of claim 1,

the first ink layer comprises the angle-dependent different-color ink, the second ink layer comprises the metal effect ink, and the angle-dependent different-color ink and the metal effect ink are printed in a back-to-back mode;

when the flip-flop ink is observed at a first observation angle, the color of the flip-flop ink is similar to or consistent with that of the metal effect ink and/or the flicker effect; and/or the optically variable ink has a different color when viewed at a second viewing angle than the metallic effect ink.

3. The safety arrangement according to claim 1,

the first ink layer comprises first angle-dependent different color ink, the second ink layer comprises second angle-dependent different color ink, and the first angle-dependent different color ink and the second angle-dependent different color ink are printed in a back-to-back mode;

the first color-dependent heterochromatic ink and the second color-dependent heterochromatic ink have similar or consistent colors when observed at a first observation angle; and/or the first optically variable ink and the second optically variable ink differ in color when viewed at a second viewing angle.

4. A safety arrangement according to claim 2 or 3,

the first viewing angle comprises a head-up angle and the second viewing angle comprises a head-up angle;

wherein the elevation angle comprises a viewing angle that is perpendicular or near perpendicular to the first and/or second ink layers, and the head-up angle comprises a viewing angle that is parallel or near parallel to the first and/or second ink layers.

5. The security device of claim 1, wherein the plastic substrate is formed by coating a white coating, a flip-flop ink and/or a metal effect ink on the plastic substrate, the plastic substrate comprises a transparent window and an opaque region, the first ink layer and the second ink layer are printed on the front surface and the back surface of the transparent window respectively, and the third ink layer is printed on the opaque region;

the third ink layer forms overprint or wiring with the first ink layer and/or the second ink layer; and/or

The opaque region has a hiding power of greater than 70%.

6. The safety device of claim 5,

the thickness of the plastic base material is more than or equal to 60 mu m and less than or equal to 110 mu m; and/or

The thickness of the first ink layer and/or the second ink layer is more than or equal to 2 μm and less than or equal to 10 μm.

7. The security device of claim 2,

the first ink layer and the second ink layer are printed in a front-back complementary mode, the first ink layer is printed on the front face in a first pattern, the second ink layer is printed on the back face in a second pattern, and the first pattern and the second pattern are complementary to form a third pattern when the front face or the back face is observed in a perspective mode;

said third pattern of said first pattern and said second pattern formed complementary to each other appears consistently as a pattern when viewed at said first angle;

the third pattern appears as two patterns when viewed at the second angle.

8. The safety device of claim 1,

the metal effect ink comprises water-based resin, an auxiliary agent, a cross-linking agent, water-based nano color paste and metal effect pigment with the average particle size of 5-30 mu m;

the angle-dependent heterochromatic ink comprises water-based resin, an auxiliary agent, a cross-linking agent, water-based nano color paste and angle-dependent heterochromatic pigment with the average particle size of 5-30 mu m.

9. The safety arrangement according to claim 8,

the metallic effect pigment comprises: metallic pigments, effect pigments; and/or

The effect pigment comprises: a pigment of a multilayer optical interference structure; and/or

The aqueous resin comprises: waterborne acrylic resin, waterborne polyurethane resin and waterborne polyester resin.

10. The safety arrangement according to claim 8,

the average grain diameter of the aqueous nano color paste is 100nm-800nm, and the content of the aqueous nano color paste is 0-8%;

the content of the water-based resin is 40-75%;

the content of the auxiliary agent is 0.5% -10%;

the content of the metallic effect pigment or the effect pigment is 10 to 35 percent;

the content of the cross-linking agent is 1-10%.

11. The safety device of claim 1,

and the tolerance of the sizes of the front and back images formed when the front and back surfaces of the first ink layer and the second ink layer are completely printed is less than 1mm.

12. The safety arrangement according to claim 1,

the first ink layer and the second ink layer are printed on the front surface and the back surface of the plastic substrate through rotary gravure; and/or

The first ink layer and the second ink layer are printed on the front side and the back side in sequence through one-step process; and/or

And a central positioning structure is arranged on the front surface and the back surface of the plastic substrate.

13. The security device according to any one of claims 1 to 3 and 5 to 12, wherein the first ink layer and the second ink layer are arranged in different microscopic preset grids, and the microscopic preset grids are amplified for anti-counterfeiting judgment.

14. A security document, comprising:

a security device as claimed in any one of claims 1 to 13.

Images