Holographic rainbow laser hidden anti-counterfeiting label and preparation method thereof

Abstract

The present invention belongs to the technical field of anti-counterfeiting labels, and specifically relates to a holographic rainbow laser hidden anti-counterfeiting label and its preparation method. The label includes a plastic film layer, a coating, a molded holographic information layer, a transfer coating, a polyamide layer, a printing layer, a pressure-sensitive adhesive layer, a holographic rainbow transfer layer, a first glue layer, a fragile paper layer, and a second glue layer arranged in sequence from top to bottom; the holographic rainbow transfer layer includes a laser molded information layer and an aluminum-plated layer, and the laser molded information layer is located above the aluminum-plated layer; the label can be peeled off and is divided into a peeling part and a bottom part, the peeling part is the part above the transfer coating, and the bottom part is divided into the transfer coating and the part below the transfer coating. After the label of the present invention is peeled off, both the upper and lower sides of the peeling part show a hidden laser effect, and the bottom part shows a rainbow holographic effect and a hidden laser effect. Consumers can identify the hidden information and judge the authenticity of the label. When the label is glued together again, the hidden laser information is still displayed; the preparation method is simple and easy.

Description

Technical Field

[0001] The invention belongs to the technical field of anti-counterfeiting marks, and in particular relates to a holographic rainbow laser covert anti-counterfeiting mark and a preparation method thereof. Background Art

[0002] Counterfeit and shoddy goods cause significant harm and losses to businesses and consumers. Anti-counterfeiting technology is one way to prevent counterfeiting. The development of anti-counterfeiting technology can help purify the market by providing difficult-to-forge labels that quickly identify product authenticity, protecting the legitimate rights and interests of authentic manufacturers and consumers.

[0003] Most of the anti-counterfeiting labels on the market today are of a relatively simple form and have a relatively simple preparation process, making them easy to imitate or transfer for secondary use.

[0004] Chinese patent CN202601083U discloses a submersible laser-type plastic film anti-counterfeiting label. The anti-counterfeiting label includes, from top to bottom, a scraping ink layer, a plastic film substrate layer, an information layer, a separation layer, a digital printing layer, and an adhesive layer. The information layer is prepared on the bottom surface of the plastic film substrate layer through a mold-printing process. The surface of the information layer has regular or irregular concave and convex patterns and is tightly pressed against the separation layer. The submersible laser-type plastic film anti-counterfeiting label embeds laser information into the label body. The information is not visible before it is uncovered and only appears after it is uncovered. In this way, counterfeiters cannot tell what anti-counterfeiting technology is in the label body from the appearance, making it difficult to counterfeit. After it is uncovered, the laser information remains on the surface of the object to which it is attached and cannot be transferred as a whole. The label can be scratched for anti-counterfeiting query or uncovered for anti-counterfeiting query in a variety of ways.

[0005] However, the anti-counterfeiting label described in this patent encountered a problem in actual use: when applying the label to an object in a warm and humid environment, the label separated from the separation layer and fell off. This separation also removed part of the digital printed layer information, rendering the label unusable and severely limiting its use. Furthermore, the anti-counterfeiting information on the label was relatively simple, resulting in limited anti-counterfeiting effectiveness. Summary of the Invention

[0006] In response to the deficiencies in the above-mentioned prior art, the present invention provides a holographic rainbow laser hidden anti-counterfeiting label with a rainbow holographic effect and unique anti-counterfeiting information. It is difficult to forge and can be quickly identified. The holographic rainbow transfer layer with a rainbow holographic effect uses fragile paper as a base material. During the overall transfer, the label is layered and destroyed, and cannot be transferred as a whole, which can effectively prevent secondary use. After the anti-counterfeiting label is peeled off, both the upper and lower surfaces of the peeled part show the hidden laser effect, and the remaining part shows the rainbow holographic effect and the hidden laser effect. Consumers can judge the authenticity of the label by identifying the hidden information. At the same time, when they are glued together again, the hidden laser information is still displayed, and the label is exclusive. The present invention also provides a preparation method thereof, which is scientific, reasonable, simple and easy to implement.

[0007] The holographic rainbow laser covert anti-counterfeiting label of the present invention comprises, arranged from top to bottom, a plastic film layer, a coating layer, an embossed holographic information layer, a transfer coating layer, a polyamide layer, a printing layer, a pressure-sensitive adhesive layer, a holographic rainbow transfer layer, a first glue layer, a fragile paper layer, and a second glue layer. The holographic rainbow transfer layer comprises a laser-embossed information layer and an aluminum-plated layer, with the laser-embossed information layer located above the aluminum-plated layer.

[0008] The anti-counterfeiting mark can be peeled off and is divided into a peeling portion and a bottom portion. The peeling portion is the portion above the transfer coating, and the bottom portion is divided into the transfer coating and the portion below the transfer coating.

[0009] in:

[0010] The plastic film layer is a 12-38 μm plastic film, which is one of PP film, PET film or holographic washed aluminum film.

[0011] The coating is a transparent layer, which is a colorless transparent layer or a light transparent layer, preferably a light transparent layer (the light transparent layer is more prominent than the colorless transparent layer in the embossed holographic information display), and a embossed holographic information layer is formed on the surface after embossing.

[0012] The transfer coating has a thickness of 0.8-3 microns. The transfer coating is coated below the embossed holographic information layer, and the embossed holographic information is hidden.

[0013] The polyamide layer improves the adhesion of the printed layer, solving the problem of the secondary layer falling off during label removal. The transfer coating is a partial coating, and the embossed holographic information not covered by the transfer coating is further covered by the polyamide layer, thereby concealing the embossed holographic information.

[0014] The printed layer information includes graphics and variable information, and the variable information can be a two-dimensional code, a one-dimensional code, a variable number, etc.

[0015] Preferably, a local covering layer is provided above the plastic film layer at a position corresponding to the variable information of the printed layer.

[0016] Preferably, a release paper layer is provided below the second glue layer.

[0017] The method for preparing the holographic rainbow laser covert anti-counterfeiting mark of the present invention comprises the following steps:

[0018] 1) coating a transfer laser aluminized coating on a PET film, and performing embossing using an embossing and printing all-in-one machine to obtain a laser embossed information layer;

[0019] 2) Full-plate aluminum plating is performed using vacuum aluminum plating technology to obtain an aluminum plating layer, and the laser molded information layer and the aluminum plating layer constitute a holographic rainbow transfer layer;

[0020] 3) The holographic rainbow transfer layer is compounded with the fragile paper sticker (fragile paper stickers generally contain fragile paper, glue and release paper), and the PET layer is peeled off to form a fragile sticker with a holographic rainbow effect;

[0021] 4) applying a coating below the plastic film layer;

[0022] 5) performing embossing on the coating to form an embossed holographic information layer;

[0023] 6) Applying a transfer coating on the embossed holographic information layer, after which the embossed holographic information disappears;

[0024] 7) applying a polyamide layer on the transfer coating;

[0025] 8) printing on the polyamide layer to form a printing layer, wherein information on the printing layer includes variable information;

[0026] 9) Compound the variable information surface with the fragile sticker with holographic rainbow effect, and then die-cut to form a holographic rainbow laser hidden anti-counterfeiting mark.

[0027] In step 1), the coating amount of the transfer laser coating is 1.2-1.3g / m 2 The T-peel strength between the transfer laser coating and the PET film is less than 0.0015 N / mm (GB / T2791-1995 Adhesive T-peel Strength Test Method Flexible Material to Flexible Material). If the T-peel strength is greater than 0.0015 N / mm, it is easy to cause incomplete transfer or blistering during peeling, affecting the surface effect of the finished logo and the secondary use of the PET film. Preferably, the transfer laser aluminum coating used is BH-1001C transfer laser aluminum coating, purchased from Shanghai Weikai Optoelectronic New Materials Co., Ltd.

[0028] In step 4), the coating is applied with laser aluminizing paint, and the laser aluminizing paint is preferably FL-7104B composite laser aluminizing paint, purchased from Shanghai Weikai Chemical Co., Ltd. The coating process is: 150-250 mesh electro-engraving roller coating, coating amount is 0.5-0.8g / m 2 , drying temperature: 90-120-180-180-140℃, speed: 70m / min.

[0029] In step 6), the transfer coating is applied using UV coating liquid, brand 1580, purchased from Shanghai Yima Industrial Co., Ltd. The coating process is anilox roller coating, mesh size is 180-360 mesh, and UV light curing.

[0030] In step 7), the coating amount of the polyamide layer is 1.0-3.5 g / m 2. The coating process is: the polyamide material is dissolved in isopropyl alcohol and then coated, the coating temperature is 70-90℃, the mesh number of the anilox roller is 100-250 mesh, the coating viscosity (coating-4 cups): 13-20″, and the vehicle speed is 50m / min. When there is no polyamide layer, the printed graphics on the printing layer are easy to fall off from the transfer coating when it is peeled off, resulting in no laser information display in part when it is peeled off. After the polyamide layer is coated, the T-peel strength between the transfer coating and the molded holographic information layer is: 0.0010-0.0030N / mm (GB / T2791-1995 Adhesive T-peel strength test method flexible material to flexible material). When the T-peel strength is less than 0.0010, it is easy to stick back during printing. When the T-peel strength is greater than 0.0030N / mm, the printing layer is easily damaged when it is peeled off.

[0031] When consumers identify authenticity:

[0032] 1. Observe the surface of the logo, which has a metallic luster and rainbow holographic effect, and the hidden holographic laser effect is not displayed; when peeled off, the logo is divided into a peeling part and a retained part. The front and back of the peeling part show the hidden transparent laser information, and the retained part shows the hidden aluminum-plated holographic laser information; when it is re-combined, the laser information is still displayed and cannot be restored.

[0033] 2. Scanning the variable information on the printed layer can achieve anti-counterfeiting, traceability, and prize redemption functions. Scanning the variable information on the printed layer can prompt verification of laser information.

[0034] 3. After peeling off, peel off the remaining bottom part. Since the holographic rainbow transfer layer with rainbow holographic effect uses fragile paper as the base material, the logo will be destroyed during the overall transfer and cannot be transferred as a whole.

[0035] 4. For the technical solution where a partial covering layer is provided above the plastic film layer corresponding to the position of the variable information on the printed layer, the variable information on the printed layer is revealed after being uncovered, which can realize functions such as anti-counterfeiting, traceability, and prize redemption. Scanning the variable information on the printed layer can prompt the verification of the laser information.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] 1. Adopting covert anti-counterfeiting technology, easy to identify: the laser embossed information will not be displayed before it is peeled off. After the label is peeled off, the laser embossed information can be displayed on the upper and lower surfaces of the peeled part and the surface of the remaining bottom part.

[0038] 2. A breakthrough in laser penetration technology has been achieved, achieving transparent laser hidden information display and aluminum-plated holographic (holographic rainbow) and laser hidden information display functions at the same time. Currently, aluminum-plated holographic laser hidden signs on the market are usually covered with an opaque substrate. When the substrate is peeled off, the obscured laser information can be seen, but no aluminum-plated information can be seen.

[0039] 3. It provides the process parameters for secondary use of laser transfer, which is environmentally friendly. Using this technology, the film used for transfer can theoretically be recycled indefinitely.

[0040] 4. The label has a fragile peeling function and strong anti-transfer performance. The label will be destroyed after peeling. At the same time, the process provided solves the problem of incomplete printed images and texts after peeling and the problem of no laser information after peeling, and the product quality is stable.

[0041] 5. The holographic rainbow is integrated with the printed pattern, and carries holographic anti-counterfeiting information. It is colorful and beautiful, with a metallic luster, a strong three-dimensional sense, and a strong visual impact. It is not easy to be imitated, has a good anti-counterfeiting effect, and is intuitively identified, with a good anti-counterfeiting effect. The logo is destroyed during the verification process, which can effectively prevent secondary use. It meets the company's requirements for high anti-counterfeiting performance, improves the grade of the product and increases its aesthetics, and is suitable for high-end products.

[0042] 6. The preparation method of the present invention is scientific, reasonable, simple and easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 Schematic diagram of the layer structure of the holographic rainbow laser covert anti-counterfeiting mark according to Example 1 of the present invention;

[0044] Figure 2 Schematic diagram of the layer structure of the holographic rainbow laser covert anti-counterfeiting mark according to Example 2 of the present invention;

[0045] In the figure: 1. Plastic film layer; 2. Coating layer; 3. Embossed holographic information layer; 4. Transfer coating layer; 5. Polyamide layer; 6. Printing layer; 7. Pressure-sensitive adhesive layer; 8. Laser-embossed information layer; 9. Aluminum-plated layer; 10. First glue layer; 11. Fragile paper layer; 12. Second glue layer; 13. Release paper layer; 14. Partial covering layer. DETAILED DESCRIPTION

[0046] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0047] Unless otherwise specified, the raw materials used in the examples are common commercially available raw materials.

[0048] Example 1

[0049] like Figure 1 As shown, the holographic rainbow laser covert anti-counterfeiting label includes, from top to bottom, a plastic film layer 1, a coating layer 2, an embossed holographic information layer 3, a transfer coating layer 4, a polyamide layer 5, a printing layer 6, a pressure-sensitive adhesive layer 7, a holographic rainbow transfer layer, a first glue layer 10, a fragile paper layer 11, and a second glue layer 12. The holographic rainbow transfer layer includes a laser-embossed information layer 8 and an aluminum-plated layer 9, with the laser-embossed information layer 8 located above the aluminum-plated layer 9.

[0050] The anti-counterfeiting mark can be peeled off and is divided into a peeling portion and a bottom portion. The peeling portion is the portion above the transfer coating 4, and the bottom portion is divided into the transfer coating 4 and the portion below the transfer coating 4.

[0051] The plastic film layer 1 is a 38 μm plastic film, which is a PP film.

[0052] The coating layer 2 is a colorless and transparent layer, and after molding, a molded holographic information layer 3 is formed on the surface.

[0053] The thickness of the transfer coating 4 is 3 microns.

[0054] The information on the printed layer 6 includes graphics and variable information, and the variable information is a QR code.

[0055] The method for preparing the holographic rainbow laser covert anti-counterfeiting mark comprises the following specific steps:

[0056] 1) coating a transfer laser aluminized coating on a PET film and embossing the film using an embossing and printing integrated machine to obtain a laser embossed information layer 8;

[0057] 2) Full-plate aluminum plating is performed using vacuum aluminum plating technology to obtain an aluminum plating layer 9. The laser molded information layer 8 and the aluminum plating layer 9 constitute a holographic rainbow transfer layer;

[0058] 3) The holographic rainbow transfer layer is compounded with the fragile paper sticker, and the PET layer is peeled off to form a fragile sticker with a holographic rainbow effect;

[0059] 4) applying a coating layer 2 below the plastic film layer 1;

[0060] 5) performing embossing on the coating layer 2 to form an embossed holographic information layer 3;

[0061] 6) applying a transfer coating 4 on the surface of the embossed holographic information layer 3, after which the embossed holographic information disappears;

[0062] 7) applying a polyamide layer 5 on the transfer coating layer 4;

[0063] 8) Printing is performed on the polyamide layer 5 to form a printed layer 6, wherein the information on the printed layer 6 includes variable information (a two-dimensional code);

[0064] 9) Compound the variable information surface with the fragile sticker with holographic rainbow effect, and then die-cut to form a holographic rainbow laser hidden anti-counterfeiting mark.

[0065] In step 1), the coating amount of the transfer laser coating is 1.2g / m 2 The transfer laser aluminum coating used is BH-1001C transfer laser aluminum coating.

[0066] In step 4), the coating 2 is coated with laser aluminizing paint, and the laser aluminizing paint is FL-7104B composite laser aluminizing paint. The coating process is: 150 mesh electro-engraving roller coating, the coating amount is 0.8g / m 2 , drying temperature: 90-120-180-180-140℃, speed: 70m / min.

[0067] In step 6), the transfer coating 4 is coated with a UV coating liquid, brand 1580, purchased from Shanghai Yima Industrial Co., Ltd. The coating process is anilox roller coating, mesh size is 180 mesh, and UV light curing.

[0068] In step 7), the coating amount of the polyamide layer 5 is 3.5 g / m 2 The coating process was as follows: polyamide material (TECHNOMELT PA 6239) was dissolved in isopropyl alcohol and then applied at a coating temperature of 70°C, an anilox roller mesh size of 100 mesh, a coating viscosity (coating-4 cups) of 20", and a vehicle speed of 50 m / min. After the polyamide layer 5 was applied, the T-peel strength between the transfer coating layer 4 and the embossed holographic information layer 3 was 0.0010 N / mm.

[0069] Example 2

[0070] like Figure 2 As shown, the holographic rainbow laser covert anti-counterfeiting label includes, from top to bottom, a plastic film layer 1, a coating layer 2, an embossed holographic information layer 3, a transfer coating layer 4, a polyamide layer 5, a printing layer 6, a pressure-sensitive adhesive layer 7, a holographic rainbow transfer layer, a first glue layer 10, a fragile paper layer 11, and a second glue layer 12. The holographic rainbow transfer layer includes a laser-embossed information layer 8 and an aluminum-plated layer 9, with the laser-embossed information layer 8 located above the aluminum-plated layer 9.

[0071] The anti-counterfeiting mark can be peeled off and is divided into a peeling portion and a bottom portion. The peeling portion is the portion above the transfer coating 4, and the bottom portion is divided into the transfer coating 4 and the portion below the transfer coating 4.

[0072] The plastic film layer 1 is a 12 μm plastic film, which is a holographic washed aluminum film.

[0073] The coating layer 2 is a colorless and transparent layer, and after molding, a molded holographic information layer 3 is formed on the surface.

[0074] The thickness of the transfer coating 4 is 0.8 microns.

[0075] The information on the printed layer 6 includes graphics and variable information, and the variable information is a QR code.

[0076] A partial covering layer 14 is provided above the plastic film layer 1 at the position corresponding to the variable information of the printed layer 6 to cover the QR code. The variable information can only be verified after the label is uncovered.

[0077] A release paper layer 13 is provided below the second glue layer 12 .

[0078] The method for preparing the holographic rainbow laser covert anti-counterfeiting mark comprises the following specific steps:

[0079] 1) coating a transfer laser aluminized coating on a PET film and embossing the film using an embossing and printing integrated machine to obtain a laser embossed information layer 8;

[0080] 2) Full-plate aluminum plating is performed using vacuum aluminum plating technology to obtain an aluminum plating layer 9. The laser molded information layer 8 and the aluminum plating layer 9 constitute a holographic rainbow transfer layer;

[0081] 3) The holographic rainbow transfer layer is compounded with the fragile paper sticker, and the PET layer is peeled off to form a fragile sticker with a holographic rainbow effect;

[0082] 4) applying a coating layer 2 below the plastic film layer 1;

[0083] 5) performing embossing on the coating layer 2 to form an embossed holographic information layer 3;

[0084] 6) applying a transfer coating 4 on the surface of the embossed holographic information layer 3, after which the embossed holographic information disappears;

[0085] 7) applying a polyamide layer 5 on the transfer coating layer 4;

[0086] 8) Printing is performed on the polyamide layer 5 to form a printed layer 6, wherein the information on the printed layer 6 includes variable information (a two-dimensional code);

[0087] 9) Compound the variable information surface with the fragile sticker with holographic rainbow effect, and then die-cut to form a holographic rainbow laser hidden anti-counterfeiting mark.

[0088] In step 1), the coating amount of the transfer laser coating is 1.3g / m 2 The transfer laser aluminum coating used is BH-1001C transfer laser aluminum coating.

[0089] In step 4), the coating 2 is coated with laser aluminizing paint, and the laser aluminizing paint is FL-7104B composite laser aluminizing paint. The coating process is: 250 mesh electro-engraving roller coating, the coating amount is 0.5g / m 2 , drying temperature: 90-120-180-180-140℃, speed: 70m / min.

[0090] In step 6), the transfer coating 4 is coated with UV coating liquid, brand 1580, purchased from Shanghai Yima Industrial Co., Ltd. The coating process is anilox roller coating, mesh size is 360 mesh, and UV light curing.

[0091] In step 7), the coating amount of the polyamide layer 5 is 1.0 g / m 2 The coating process was as follows: polyamide material (TECHNOMELT PA 6239) was dissolved in isopropyl alcohol and then applied. The coating temperature was 90°C, the mesh size of the anilox roller was 250 mesh, the coating viscosity (coating-4 cup) was 13", and the vehicle speed was 50 m / min. After the polyamide layer 5 was applied, the T-peel strength between the transfer coating layer 4 and the embossed holographic information layer 3 was 0.0030 N / mm.

Claims

1. A method for preparing a holographic rainbow laser covert anti-counterfeiting mark, characterized by: The invention comprises a plastic film layer (1), a coating layer (2), a molded holographic information layer (3), a transfer coating layer (4), a polyamide layer (5), a printing layer (6), a pressure-sensitive adhesive layer (7), a holographic rainbow transfer layer, a first glue layer (10), a fragile paper layer (11) and a second glue layer (12) which are arranged in sequence from top to bottom; the holographic rainbow transfer layer comprises a laser molded information layer (8) and an aluminum-plated layer (9), and the laser molded information layer (8) is located above the aluminum-plated layer (9); The anti-counterfeiting mark can be peeled off and is divided into a peeling portion and a bottom portion. The peeling portion is the portion above the transfer coating (4), and the bottom portion is divided into the transfer coating (4) and the portion below the transfer coating (4). When observing the surface of the mark, a holographic rainbow effect with metallic luster is displayed, and the hidden holographic laser effect is not displayed. When peeled off, both the front and back sides of the peeling portion display the hidden transparent laser information, and the bottom portion displays the hidden aluminum-plated holographic laser information. When re-combined, the laser information is still displayed and cannot be restored. The polyamide layer (5) serves to improve the adhesion of the printing layer (6), thereby solving the problem of the secondary layer falling off when removing the label; the transfer coating (4) is a local coating, and the embossed holographic information not covered by the transfer coating (4) is further covered by the polyamide layer (5), thereby serving to hide the embossed holographic information; The method for preparing the holographic rainbow laser covert anti-counterfeiting mark comprises the following steps: 1) coating a transfer laser aluminum coating on a PET film, and performing embossing using an embossing and printing all-in-one machine to obtain a laser embossed information layer (8); 2) using vacuum aluminum plating technology to perform full-plate aluminum plating to obtain an aluminum plating layer (9), and the laser molded information layer (8) and the aluminum plating layer (9) constitute a holographic rainbow transfer layer; 3) The holographic rainbow transfer layer is laminated with the fragile paper sticker, and the PET layer is peeled off to form a fragile sticker with a holographic rainbow effect; 4) applying a coating layer (2) below the plastic film layer (1); 5) performing embossing on the coating layer (2) to form an embossed holographic information layer (3); 6) applying a transfer coating (4) on the surface of the embossed holographic information layer (3), wherein the embossed holographic information disappears after the coating; 7) applying a polyamide layer (5) on the transfer coating (4); 8) Printing is performed on the polyamide layer (5) to form a printing layer (6), wherein information on the printing layer (6) includes variable information; 9) Compound the variable information surface with the fragile sticker with holographic rainbow effect, and then die-cut it to form a holographic rainbow laser covert anti-counterfeiting mark; in, The coating (2) is a transparent color layer, which is a colorless transparent color layer or a light-colored transparent color layer, and after molding, a molded holographic information layer (3) is formed on the surface; In step 4), the coating (2) is coated with laser aluminum coating, and the coating process is: 150-250 mesh electro-engraving roller coating, and the coating amount is 0.5-0.8g / m 2 , drying temperature: 90-120-180-180-140 ℃, speed: 70m / min; In step 6), the transfer coating is applied using a UV coating liquid; the coating process is an anilox roller coating with a mesh size of 180-360 mesh and UV light curing; In step 7), the coating amount of the polyamide layer (5) is 1.0-3.5 g / m 2 The coating process is as follows: the polyamide material is dissolved in isopropyl alcohol and then coated, the coating temperature is 70-90°C, the mesh number of the anilox roller is 100-250 mesh, the coating-4 cup viscosity is 13-20", and the vehicle speed is 50m / min; after the polyamide layer (5) is coated, the T-peel strength between the transfer coating (4) and the molded holographic information layer (3) is 0.0010-0.0030N / mm.

2. The method for preparing a holographic rainbow laser covert anti-counterfeiting mark according to claim 1, characterized in that: The plastic film layer (1) is a 12-38 μm plastic film, which is one of PP film, PET film or holographic washed aluminum film.

3. The method for preparing a holographic rainbow laser covert anti-counterfeiting mark according to claim 1, characterized in that: The thickness of the transfer coating (4) is 0.8-3 microns.

4. The method for preparing a holographic rainbow laser covert anti-counterfeiting mark according to claim 1, characterized in that: The information of the printing layer (6) includes graphics and variable information.

5. The method for preparing a holographic rainbow laser covert anti-counterfeiting mark according to claim 4, characterized in that: A local covering layer (14) is provided above the plastic film layer (1) at a position corresponding to the variable information of the printed layer (6).

6. The method for preparing a holographic rainbow laser covert anti-counterfeiting mark according to claim 1, characterized in that: A release paper layer (13) is provided below the second glue layer (12).

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