A multi-layer structure anti-counterfeiting gilding method

Abstract

The present application belongs to the technical field of anti-fake gilding, and discloses a multilayer structure anti-fake gilding method, which comprises the following steps: step 1, manufacturing a micro-nano gilding plate with microstructure; step 2, manufacturing a transparent color-changing gilding film; step 3, printing a pattern on the surface of a substrate; and step 4, using the micro-nano gilding plate with microstructure manufactured in step 1 to stamp the transparent color-changing gilding film manufactured in step 2 on a four-color image. The gilding plate with optical microstructure is adopted in the present application to produce diffraction effects on the surface, such as light column, frosted glass, embossing and other effects. The gilding film adopts high-transparency pearl luster, and has very strong diffraction color-changing effect. The multilayer color-changing effect is achieved through the multiple superposition of light diffraction and interference to achieve the anti-fake effect. The combination and location of the printed image can meet the high aesthetic requirements, and the anti-fake pattern produced has diversity.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of anti-fake gold stamping, and particularly relates to a multi-layer structure anti-fake gold stamping method. BACKGROUND

[0002] With the increasing requirement of security of bills and high-value commodity packaging, printing anti-fake is becoming a more and more extensive demand, and printing anti-fake can prevent counterfeiting and illegal scanning copying. At present, printing anti-fake is mainly realized by combining ink printing with optical gold stamping film, that is, the pattern with optical effect is made on the gold stamping film, the packaging pattern is printed by ink, and then the gold stamping film is printed on the printed pattern to present the anti-fake printing effect. However, the method of combining ink printing with optical gold stamping film is relatively monotonous in the combination degree of the pattern, because the pattern of the gold stamping film is made on the whole, and the whole pattern can only present one same effect, and different gold stamping effects cannot be used for different places according to the pattern structure, therefore, the anti-fake pattern of the product is relatively single, the anti-fake beauty is poor, and it is difficult to realize color change and gloss change in combination with the printing pattern structure and gradient color. A kind of existing numerical control machine tool engraving plate gold stamping is to engrave the metal plate to obtain the desired texture effect by using the numerical control machine tool. Although this method can present various texture effects according to the requirements, the machining precision of the numerical control machine tool is not high, and cannot reach the micro-nano level, and the precision is not high. Another is a film chemical etching plate gold stamping, which transfers the pattern on the plate and the aluminum foil to the paper at the same time by heating and pressing the gold stamping plate to form the corresponding gold stamping effect. However, both of the two methods need to use a customized holographic pattern positioning gold stamping foil to realize gold stamping. SUMMARY

[0003] The application aims to provide a multi-layer structure anti-fake gold stamping method to solve the above technical problems.

[0004] To solve the above technical problems, the specific technical scheme of the multi-layer structure anti-fake gold stamping method of the application is as follows:

[0005] A multi-layer structure anti-fake gold stamping method, comprising the following steps:

[0006] Step 1: making a micro-nano gold stamping plate with microstructure;

[0007] Step 2: making a transparent color-changing gold stamping film;

[0008] Step 3: printing the pattern on the surface of the substrate;

[0009] Step 4: using the micro-nano gold stamping plate with microstructure made in step 1 to gold stamp the transparent color-changing gold stamping film made in step 2 on the four-color pattern.

[0010] Further, the micro-nano gold stamping plate in step 1 is a nickel or chromium plate material.

[0011] Further, the step 1 comprises the following specific steps:

[0012] Step 1.1: Design the gloss change of the anti-counterfeiting pattern according to the graphic structure, and convert it into a gray-scale image;

[0013] Step 1.2: Convert the image into a binary image with angle change through AI software;

[0014] Step 1.3: Form the optical master with micro-nano structure after silver spraying and electroforming treatment after image lithography;

[0015] Step 1.4: Copy the optical master pattern to the metal plate by electrochemical metal deposition method;

[0016] Step 1.5: Remove the non-text area of the gold stamping plate by CNC engraving, and complete the production of the micro-nano gold stamping plate.

[0017] Further, the gloss change of the anti-counterfeiting pattern in step 1.1 includes light column, laser, relief, and cat eye.

[0018] Further, the line thickness of the micro-nano structure in step 1.3 is 5-10u, and the depth is 3-5u.

[0019] Further, the step 2 comprises the following steps:

[0020] Step 2.1: Apply release layer on the PET base film, which is used for peeling off the gold stamping film from the metal plate after gold stamping;

[0021] Step 2.2: Apply UV color-changing layer on the release layer using film coating machine, with thickness of 5-10u;

[0022] Step 2.3: Finally, apply adhesive layer, which is used for bonding the gold stamping film with the printing substrate.

[0023] Further, the UV color-changing layer in step 2.2 is uniformly dispersed in the UV resin by using organic polymer color-changing pearl powder, and is uniformly coated on the release layer by film coating.

[0024] Further, the color-changing pearl powder is a transparent flake crystal with spiral structure, and the change in color gray level is positively correlated with the color-changing effect, and the color change is negatively correlated with the color-changing effect, and the color-producing effect produces interference.

[0025] Further, step 3 uses four-color printing pattern KCMY method to print graphic structure and basic color on the substrate surface.

[0026] Further, the step 4 comprises the following specific steps:

[0027] Step 4.1: contact the micro-nano gold stamping plate with the gold stamping film on the substrate;

[0028] Step 4.2: peel off the gold stamping film from the metal plate;

[0029] Step 4.3: form the anti-fake effect pattern.

[0030] The multi-layer structure anti-fake gold stamping method has the following advantages: the present application realizes the anti-fake effect of color change and gloss change of the multi-layer structure by combining the printing pattern and color change through the gold stamping method; the gold stamping plate adopts nickel and chromium as the basic plate material, and the hardness of the material is much greater than that of the conventional plate material; the image is processed by the photoetching direct engraving method, and the metal plate is processed by the electrochemical reaction, so that the micron-level image can be realized without the need of positioning the holographic pattern and gold stamping foil for gold stamping; the transparent gold stamping film is adopted, the color change principle is to realize the interference color change effect through the particles of the pearl powder in the UV resin, and the coating release layer, the pearl layer and the adhesive layer are directly used, so that the refractive and reflective performance is achieved without the need of plating aluminum or zinc sulfide.

[0031] In summary, the gold stamping plate with optical microstructure is adopted in the present application to produce diffraction effect on the surface, and various effects such as light column, frosted glass and relief are presented. The gold stamping film adopts high-transparency pearl with strong diffraction color change effect. The multi-layer color change effect is achieved by the multiple superposition of light diffraction and interference to achieve the anti-fake effect. The present application can use different optical texture effects in different places according to the pattern structure. The combination and positioning of the printed image can meet the high aesthetic requirements. The anti-fake pattern produced has diversity. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 The flow chart of the multi-layer structure anti-fake gold stamping method of the present application is shown in the figure;

[0033] Figure 2 The structure diagram of the transparent color-changing gold stamping film of the present application is shown in the figure;

[0034] Figure 3 The light path diagram of the UV color-changing layer of the present application is shown in the figure;

[0035] Figure 4 The structure diagram after gold stamping of the present application is shown in the figure;

[0036] Figure 5 The color change effect diagram of the present application is shown in the figure;

[0037] Figure 6 The multi-layer structure layering effect diagram of the present application is shown in the figure;

[0038] Figure 7 The gold stamping effect diagram of the present application is shown in the figure. DETAILED DESCRIPTION

[0039] In order to better understand the purpose, structure and function of the present application, the following will be further described in detail in combination with the drawings.

[0040] As shown in Figure 1 A multi-layer structure anti-fake gold stamping method of the present application comprises the following steps:

[0041] Step 1: making a micro-nano gold stamping plate with microstructure;

[0042] Zinc, copper or steel is commonly used in printing to directly engrave by mechanical electrography or to obtain a printed gold stamping plate by chemical corrosion. Conventional gold stamping plates, whether by corrosion method or electrography method, are difficult to process micron-level images, and the traditional precision of 0.03mm line has reached the processing limit, and the minimum limit has been reached in terms of plate material durability. The gold stamping plate of the present application uses nickel and chromium as the basic plate material, and the hardness of the material is much higher than that of conventional plate materials. The image is processed by direct lithography and etching, and the image is processed into a metal plate by electrochemical reaction, and the precision of the image is micron-level image. The manufacturing of the micro-nano gold stamping plate specifically comprises the following steps:

[0043] Step 1.1: design the gloss change of the anti-fake pattern according to the graphic structure (not limited to light column, laser, relief, cat eye effect, etc.), and convert it into a gray scale image;

[0044] Step 1.2: convert the image into a binary image with angle change by AI software;

[0045] Step 1.3: after the image is lithographed, it is processed by silver spraying and electroforming to form an optical master plate with micro-nano structure (line thickness 5-10u, depth 3-5u);

[0046] Step 1.4: use electrochemical metal deposition method to copy the optical master plate pattern to the metal plate;

[0047] Step 1.5: remove the non-text area of the gold stamping plate by CNC engraving to complete the manufacturing of the micro-nano gold stamping plate. The gold stamping plate effect is shown as "gold stamping plate" in Figure 6 .

[0048] Step 2: making a transparent discoloration gold stamping film;

[0049] Step 2.1: apply a release layer on the PET base film, which is used for stripping the gold stamping film from the metal plate after gold stamping;

[0050] Step 2.2: apply a UV discoloration layer on the release layer using a film coating machine, with a thickness of 5-10u; the UV discoloration layer uses organic polymer discoloration pearl powder uniformly dispersed in UV resin, which is uniformly coated on the release layer by film coating.

[0051] Step 2.3: Finally, the adhesive layer is coated, which is used to combine the gold foil film with the printed substrate.

[0052] The color-changing gold foil film effect diagram is shown as Figure 6 The color-changing gold foil film effect diagram is shown as

[0053] The transparent color-changing gold foil film structure of the present application is shown as Figure 2 The present application uses film surface coating machine film surface transfer method to effectively optimize the color-changing powder flaky dispersion arrangement, improve uniformity and brightness, and improve the color-changing interference effect. Figure 3 The color-changing layer light path diagram.

[0054] The color-changing pearl powder used in the present application is a transparent flake crystal with a spiral structure, which does not absorb light but only reflects and transmits light, has very high light transmittance, can well combine the color depth and color change of the printed image, and produce interference superposition effect. The distance between two layers with the same molecular direction is defined as the pitch, which determines the color of the flake crystal. A typical chameleon pigment flake crystal has about 10 superimposed pitches, each of which reflects light. In the incident light, the light with a wavelength corresponding to the pitch of the particle will be reflected, and the remaining part will be transmitted to the surface of the object. Due to the transparency of the pigment, the color of the object itself also plays a very important role when using chameleon pigment. When using chameleon pigment on a dark, especially black surface, a unique color effect that changes color with different observation angles can be obtained. On the contrary, on a white or gray background, only a very subtle color change of the flashing effect can be produced, because the background reflects most of the incident light. The color gray level change is positively correlated with the color-changing effect, and the color change is negatively correlated with the color-changing effect, so the color rendering effect produces interference.

[0055] The UV color-changing layer uses a thermoplastic UV resin type gold foil film, which effectively solves the uniform dispersion of the pearl particles in the resin. The resin contains polyurethane and other gold foil films with good thermoplasticity, which can effectively solve the replication of the microstructure during gold plating.

[0056] The traditional gold foil film enhances the refraction and reflection performance by plating aluminum or zinc sulfide. The gold foil film of the present application is a transparent gold foil film, which directly uses a coating release layer, a pearl layer, and an adhesive layer.

[0057] Step 3: Surface pattern printing of the substrate; using four-color printing pattern KCMY method, printing pattern and basic color on the surface of the substrate; the printing effect is shown as Figure 6 The printing pattern is shown as

[0058] Step 4: using the micro-structured micro-nano stamping plate prepared in step 1, stamping the transparent color-changing stamping film prepared in step 2 on the four-color image.

[0059] Step 4.1: contacting the micro-nano stamping plate with the stamping film on the substrate;

[0060] Step 4.2: stripping the metal plate from the stamping film;

[0061] Step 4.3: forming a security effect pattern. As shown in Figure 4 The structure after stamping by the method of the present application is shown, the bottom layer is the printing layer, the middle layer is the UV color-changing layer, and the top layer is the stamping microstructure. As shown in Figure 5 The color-changing effect diagram.

[0062] The traditional security method is to form a film by photoetching and then transfer it to the substrate, while the present application directly uses a plate with microstructure to stamp an image with special optical effects. The surface of the micro-nano stamping plate has a groove structure with optical structure, and the stamping film forms a security effect with optical diffraction levels on the surface, as shown in Figure 7 Different optical texture effects can be used in different places according to the pattern structure. Combined with the printed image, the set position can meet the high aesthetic requirements. The security pattern produced has diversity.

[0063] The present application uses a stamping plate with optical microstructure to produce diffraction effects on the surface, presenting light columns, frosted, embossed and other effects. The stamping film uses high-transparency pearl, which has very strong diffraction color-changing effects. The multi-layer color-changing effect achieves security effect through light diffraction and interference.

[0064] Color-changing relationship: the gray scale change of the printed pattern is positively correlated with the interference strength of the pearl, and the interference color change is in phase with the diffraction change of the film surface, presenting multiple effects such as dynamic, embossed and frosted.

[0065] It can be understood that the present application is described through some embodiments, and those skilled in the art know that various changes or equivalent replacements can be made to these features and embodiments without departing from the spirit and scope of the present application. In addition, under the guidance of the present application, these features and embodiments can be modified to adapt to specific conditions and materials without departing from the spirit and scope of the present application. Therefore, the present application is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are within the scope of the present application.

Claims

1. A multi-layer anti-counterfeiting hot stamping method, characterized in that: The steps include: Step 1: Make a micro-nano hot stamping plate with microstructure; Step 2: Make a transparent color-changing hot stamping film; Step 2.1: Apply a release layer on the PET base film. The release layer is used to separate the hot stamping film from the metal plate after hot stamping. Step 2.2: Use a film coating machine to apply a UV color-changing layer on the release layer with a thickness of 5-10u; The UV color-changing layer uses organic polymer color-changing pearlescent powder evenly dispersed in UV resin, and is evenly coated on the release layer through film surface coating; The color-changing pearlescent powder is a transparent plate crystal with a spiral structure. The change in the grayscale of the color is positively correlated with the color change effect, and the color change is negatively correlated with the color change. The color effect produces constructive interference. Step 2.3: Finally, apply the adhesive layer, which is used to bond the hot stamping film to the printed substrate; Step 3: Printing pattern on substrate surface; Step 3 uses a four-color printing pattern KCMY method to print a graphic structure and basic colors on the surface of the substrate; Step 4: Use the micro-nano hot stamping plate with microstructure produced in step 1 to hot stamp the transparent color-changing hot stamping film produced in step 2 onto the four-color image.

2. The multi-layer anti-counterfeiting hot stamping method according to claim 1, characterized in that: The micro-nano hot stamping plate in step 1 is a nickel or chromium plate.

3. The multi-layer anti-counterfeiting hot stamping method according to claim 1, characterized in that: The step 1 includes the following specific steps: Step 1.1: Design the gloss variation of the anti-counterfeiting pattern according to the graphic structure and convert it into a grayscale image; Step 1.2: Convert the image into a binary image with angle changes using AI software; Step 1.3: After the image is photolithographically processed by silver spraying and electroforming, an optical master plate with micro-nano structures is formed; Step 1.4: Use electrochemical metal deposition to copy the optical master pattern onto the metal plate; Step 1.5: CNC engraving and removal of non-image and text areas of the hot stamping metal plate to complete the production of the micro-nano hot stamping plate.

4. The multi-layer anti-counterfeiting hot stamping method according to claim 3, characterized in that: The gloss changes of the anti-counterfeiting pattern described in step 1.1 include light beams, lasers, and reliefs.

5. The multi-layer anti-counterfeiting hot stamping method according to claim 3, characterized in that: The line thickness of the micro-nano structure described in step 1.3 is 5-10u and the depth is 3-5u.

6. The multi-layer anti-counterfeiting hot stamping method according to claim 1, characterized in that: The step 4 includes the following specific steps: Step 4.1: Press the micro-nano hot stamping plate and the hot stamping film together on the substrate; Step 4.2: Peel off the metal plate and the hot stamping film; Step 4.3: Forming an anti-counterfeiting effect pattern.

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