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 laser hidden anti-counterfeiting label and a preparation method thereof. The label includes a plastic film layer, a coating, a molded holographic information layer, a partial transfer coating, a polyamide layer, a printing layer, a color ink layer and a pressure-sensitive adhesive layer arranged in sequence from top to bottom; the anti-counterfeiting label can be uncovered, and the peeled portion is the portion above the partial transfer coating, and the remaining bottom is divided into the partial transfer coating and the portion below the partial transfer coating. The label of the present invention has good temperature and humidity resistance, and the anti-counterfeiting information is unique. It is difficult to forge and can be quickly identified. It is destroyed in layers and cannot be transferred as a whole, and can effectively prevent secondary use; after the anti-counterfeiting label is uncovered, the upper and lower surfaces of the peeled portion both show a hidden laser effect, and the remaining bottom portion also shows the hidden laser information. 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, making the label exclusive; the preparation method is simple and easy.

Description

Technical Field

[0001] The present invention belongs to the technical field of anti-counterfeiting marks, and in particular relates to a laser hidden 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 anti-counterfeiting labels currently on the market are simple in form and manufactured using a relatively simple process, making them susceptible to imitation or secondary use. The current trend in anti-counterfeiting measures is towards refined management, with one label and one code. Some applications require that every supplied label be activated and affixed to the product.

[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 removing the label from the backing paper in high temperature and high humidity environments, the bottom layer of the label easily fell off onto the release paper, seriously restricting the application of this technology in the hot and humid environment of southern China. In addition, the anti-counterfeiting information on the label was relatively simple, and the anti-counterfeiting effect was limited. Summary of the Invention

[0006] In response to the deficiencies of the above-mentioned prior art, the present invention provides a laser hidden anti-counterfeiting label with good temperature and humidity resistance, unique anti-counterfeiting information, which is difficult to forge and can be quickly identified. It can be destroyed in layers and cannot be transferred as a whole, and 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 also shows the hidden laser information. 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, making the label exclusive. The present invention also provides a preparation method thereof, which is scientific, reasonable, simple and easy to implement.

[0007] The laser covert anti-counterfeiting label of the present invention comprises a plastic film layer, a coating layer, a molded holographic information layer, a local transfer coating layer, a polyamide layer, a printing layer, a color ink layer and a pressure-sensitive adhesive layer arranged in sequence from top to bottom;

[0008] The anti-counterfeiting mark can be peeled off and is divided into a peeling part and a bottom part. The peeling part is the part above the local transfer coating, and the bottom part is divided into the local transfer coating and the part below the local 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). After embossing, an embossed holographic information layer is formed on the surface, which can be a special edition logo, graphics, etc.

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

[0013] The thickness of the polyamide layer is 1.0-3.5g / m 2 The polyamide layer improves the adhesion of the printed layer, solving the problem of the secondary layer falling off during label removal. The embossed holographic information not covered by the partial 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, a verification code, 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 prompt text layer is provided above the partial covering layer.

[0017] Preferably, a release paper layer is provided below the pressure-sensitive adhesive layer.

[0018] The method for preparing the laser covert anti-counterfeiting mark of the present invention comprises the following steps:

[0019] 1) Applying a coating layer below the plastic film layer;

[0020] 2) performing embossing on the coating to form an embossed holographic information layer;

[0021] 3) Applying a local transfer coating on the embossed holographic information layer, after which the embossed holographic information disappears;

[0022] 4) applying a polyamide layer on the local transfer coating;

[0023] 5) printing on the polyamide layer to form a printing layer, wherein information on the printing layer includes variable information;

[0024] 6) Apply the color ink layer, apply glue and then die-cut to form a laser hidden anti-counterfeiting mark.

[0025] In step 1), 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, preferably 180 mesh; the coating amount is 0.5-0.8g / m 2 , drying temperature: 90-120-180-180-140℃, speed: 50-80m / min.

[0026] In step 2), the embossing is performed using an embossed information plate. Preferably, the embossed information plate is prepared using a point light source encryption platemaking technique. After embossing, the laser information cannot be observed under natural light, but can be observed using a point light source such as a mobile phone light. Specifically, when observing the surface of the sign, the embossed laser information is not visible. After the sign is uncovered, the hidden embossed laser information is also not visible. Only after uncovering and illuminating with a point light source can the embossed laser information be made visible.

[0027] In step 3), the local transfer coating is a local positioning coating, which is divided into two parts. The area corresponding to the variable information is fully coated, and other positions are set as warning local coatings, such as words such as invalid when peeled off and VOID. When peeled off, a transparent laser effect with warning words appears. The variable information is completely peeled off, and a transparent laser effect appears.

[0028] In step 3), the local 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.

[0029] In step 4), the polyamide layer 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 size of the anilox roller is 100-250 mesh, the coating viscosity (coating-4 cups) is 13-20", and the vehicle speed is 50m / min. Without the polyamide layer, the printed image on the printed layer is easily detached from the local transfer coating when peeling off, resulting in a partial lack of laser information display when peeling off. After the polyamide layer is coated, the T-peel strength between the local transfer coating and the embossed 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 cause back-sticking during printing. When the T-peel strength is greater than 0.0030N / mm, the printed layer is easily damaged when peeling off.

[0030] Preferably, in step 6), after the glue coating is completed, a local covering layer is provided on the plastic film layer at a position corresponding to the variable information.

[0031] More preferably, a prompt text layer is printed above the partial covering layer.

[0032] When consumers identify authenticity:

[0033] 1. Observe the surface of the logo. The hidden holographic laser effect is not displayed. When it is peeled off, the logo is divided into a peeling part and a bottom part. Both the front and back of the peeling part show the hidden transparent laser information, and the bottom part also shows the hidden laser information. When it is reassembled, the laser information is still displayed and cannot be restored.

[0034] 2. Scanning the variable information on the printed layer can achieve functions such as anti-counterfeiting, traceability, and prize redemption. Scanning the variable information on the printed layer can prompt verification of laser information.

[0035] 3. 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, thus realizing functions such as anti-counterfeiting, traceability, and prize redemption. Scanning the variable information on the printed layer can prompt 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. The label has a peel-off function and strong anti-transfer performance. The label will not be damaged after peeling off. At the same time, the process provided solves the problem of incomplete printed images and texts after peeling off and the problem of no laser information after peeling off. The product is stable.

[0039] 3. The present invention proposes a method for improving the temperature and humidity resistance of laser-removable labels.

[0040] 4. The preparation method of the present invention is scientific, reasonable, simple and easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 Schematic diagram of the layer structure of the laser covert anti-counterfeiting mark according to Example 1 of the present invention;

[0042] Figure 2 Schematic diagram of the layer structure of the laser covert anti-counterfeiting mark according to embodiment 2 of the present invention;

[0043] In the figure: 1. Plastic film layer; 2. Coating layer; 3. Embossed holographic information layer; 4. Local transfer coating layer; 5. Polyamide layer; 6. Printing layer; 7. Color ink layer; 8. Pressure-sensitive adhesive layer; 9. Local covering layer; 10. Prompt text layer; 11. Release paper layer. DETAILED DESCRIPTION

[0044] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0045] Unless otherwise specified, the raw materials used in the examples are common commercially available raw materials.

[0046] Example 1

[0047] like Figure 1 As shown, the laser covert anti-counterfeiting label comprises, from top to bottom, a plastic film layer 1, a coating layer 2, a molded holographic information layer 3, a local transfer coating layer 4, a polyamide layer 5, a printing layer 6, a color ink layer 7, and a pressure-sensitive adhesive layer 8;

[0048] The anti-counterfeiting mark can be peeled off and is divided into a peeling part and a bottom part. The peeling part is the part above the local transfer coating 4, and the bottom part is divided into the local transfer coating 4 and the part below the local transfer coating 4.

[0049] The plastic film layer 1 is a 12 μm plastic film, and the plastic film is a PP film.

[0050] The coating layer 2 is a colorless and transparent color layer, and after molding, a molded holographic information layer 3 is formed on the surface, which is a special edition logo.

[0051] The partial transfer coating 4 has a thickness of 0.8 microns and is applied below the embossed holographic information layer 3 to conceal the embossed holographic (laser information) information. The partial transfer coating 4 is applied in a lock-edge manner (the area around the logo cannot be peeled off), leaving at least one edge of the logo uncoated.

[0052] The information on the printed layer 6 includes graphics and variable information, and the variable information is a QR code.

[0053] The method for preparing the laser covert anti-counterfeiting mark comprises the following specific steps:

[0054] 1) applying a coating layer 2 below the plastic film layer 1;

[0055] 2) performing embossing on the coating layer 2 to form an embossed holographic information layer 3;

[0056] 3) coating the local transfer coating 4 on the embossed holographic information layer 3, after which the embossed holographic information disappears;

[0057] 4) applying a polyamide layer 5 on the local transfer coating 4;

[0058] 5) 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;

[0059] 6) Applying the color ink layer 7, applying the glue and then die-cutting to form a laser hidden anti-counterfeiting mark.

[0060] In step 1), the coating 2 is coated with laser aluminizing paint, and the laser aluminizing paint adopts FL-7104B composite laser aluminizing paint. The coating process is: 180 mesh electric engraving roller coating, the coating amount is 0.5g / m 2 , drying temperature: 90-120-180-180-140℃, speed: 50m / min.

[0061] In step 3), the local transfer coating 4 is applied in two sections: the area corresponding to the variable information is fully coated, while the remaining areas are partially coated with warning characters such as VOID. When the coating is peeled off, a transparent laser effect with the warning text appears. The variable information area is completely peeled off, and a transparent laser effect appears. The local transfer coating 4 is applied using a UV coating liquid (brand 1580) purchased from Shanghai Yima Industrial Co., Ltd. The coating process is anilox roller coating with a mesh size of 360 and UV light curing.

[0062] In step 4), the coating amount of the polyamide layer 5 is 1.0 g / m 2 The coating process involved dissolving polyamide material (TECHNOMELT PA 6239) in isopropyl alcohol before coating. The coating temperature was 90°C, the anilox roll mesh size was 250 mesh, the coating viscosity (coating-4 cup) was 13", and the vehicle speed was 50 m / min. Without the polyamide layer 5, the printed image on the printed layer 6 easily fell off the local transfer coating 4 during peeling, resulting in a partial loss of laser information display. After the polyamide layer 5 was applied, the T-peel strength between the local transfer coating 4 and the embossed holographic information layer 3 was 0.0030 N / mm.

[0063] Example 2

[0064] like Figure 2 As shown, the laser covert anti-counterfeiting label comprises, from top to bottom, a plastic film layer 1, a coating layer 2, a molded holographic information layer 3, a local transfer coating layer 4, a polyamide layer 5, a printing layer 6, a color ink layer 7, and a pressure-sensitive adhesive layer 8;

[0065] The anti-counterfeiting mark can be peeled off and is divided into a peeling part and a bottom part. The peeling part is the part above the local transfer coating 4, and the bottom part is divided into the local transfer coating 4 and the part below the local transfer coating 4.

[0066] The plastic film layer 1 is a 38 μm plastic film, which is a holographic washed aluminum film.

[0067] The coating layer 2 is a light-colored transparent layer, and after molding, a molded holographic information layer 3 is formed on the surface, which is graphic information.

[0068] The thickness of the partial transfer coating 4 is 3 microns. The partial transfer coating 4 is coated below the embossed holographic information layer 3 to hide the embossed holographic (laser information) information. The partial transfer coating 4 is applied with a lock edge (the area around the logo cannot be peeled off).

[0069] The information on the printed layer 6 includes graphics and variable information, and the variable information is a verification code.

[0070] A local covering layer 9 is provided above the plastic film layer 1 at the position corresponding to the variable information of the printed layer 6 .

[0071] A prompt text layer 10 is provided above the local covering layer 9 .

[0072] A release paper layer 11 is provided below the pressure-sensitive adhesive layer 8 .

[0073] This setting can achieve the following: when the label is peeled off, it is partially peeled off; the unpeeled part has a pressure-sensitive adhesive, and the pressure-sensitive adhesive is used to stick to the unpeeled area again, and the unpeeled area is partially damaged, which increases the anti-counterfeiting performance and function of the label

[0074] The method for preparing the laser covert anti-counterfeiting mark comprises the following specific steps:

[0075] 1) applying a coating layer 2 below the plastic film layer 1;

[0076] 2) performing embossing on the coating layer 2 to form an embossed holographic information layer 3;

[0077] 3) coating the local transfer coating 4 on the embossed holographic information layer 3, after which the embossed holographic information disappears;

[0078] 4) applying a polyamide layer 5 on the local transfer coating 4;

[0079] 5) 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;

[0080] 6) Applying the color ink layer 7, applying the glue and then die-cutting to form a laser hidden anti-counterfeiting mark.

[0081] In step 1), the coating 2 is coated with laser aluminizing paint, and the laser aluminizing paint adopts FL-7104B composite laser aluminizing paint. The coating process is: 250 mesh electric engraving roller coating, the coating amount is 0.8g / m 2 , drying temperature: 90-120-180-180-140℃, speed: 80m / min.

[0082] In step 2), embossing is performed using an embossed information plate, prepared using point light source encryption technology. After embossing, the laser information cannot be observed under natural light, but can be observed using a point light source such as a mobile phone light. Specifically, the embossed laser information is not visible when observing the sign surface, and even after the sign is uncovered, the hidden embossed laser information remains invisible. Only after uncovering the sign and illuminating it with a point light source can the embossed laser information be made visible.

[0083] In step 3), the local transfer coating 4 is applied in two sections: the area corresponding to the variable information is fully coated, and the remaining areas are partially coated with warnings. When the expiration message is removed, a transparent laser effect with warning text appears. The variable information area is completely removed, and a transparent laser effect appears. The local transfer coating 4 is applied using a UV coating liquid (brand 1580) purchased from Shanghai Yima Industrial Co., Ltd. The coating process is an anilox roller coating with a mesh size of 180 and UV light curing.

[0084] In step 4), the coating amount of the polyamide layer 5 is 3.5 g / m 2 The coating process for the polyamide layer 5 is as follows: polyamide material (TECHNOMELT PA 6239) is dissolved in isopropyl alcohol and then applied. The coating temperature is 70°C, the mesh size of the anilox roller is 100 mesh, the coating viscosity (coating-4 cup) is 20", and the vehicle speed is 50 m / min. Without the polyamide layer 5, the printed image on the printed layer 6 easily falls off the local transfer coating 4 when peeling off, resulting in a partial loss of laser information when peeling off. After the polyamide layer 5 is applied, the T-peel strength between the local transfer coating 4 and the embossed holographic information layer 3 is 0.0010 N / mm.

[0085] In step 6), after the glue coating is completed, a local cover layer 9 is provided on the plastic film layer 1 at the position corresponding to the variable information. A prompt text layer 10 is printed above the local cover layer 9. The local cover layer 9 and the prompt text layer 10 are prepared by conventional methods and will not be described in detail here.

[0086] Comparative Example 1

[0087] The structure and preparation method of the logo are the same as those of Example 1, except that the logo does not contain the polyamide layer 5.

[0088] Comparative Example 2

[0089] The structure and preparation method of the logo are the same as those of Example 1, except that a full-plate transfer coating is provided corresponding to the local transfer coating 4 .

[0090] The labels prepared by the above method were tested on 200 pieces each time. The test results (number of bottom layers falling off) are shown in Table 1.

[0091] Table 1

[0092]

[0093]

Claims

1. A method for preparing a laser covert anti-counterfeiting mark, characterized by: The laser covert anti-counterfeiting label comprises a plastic film layer (1), a coating layer (2), a molded holographic information layer (3), a local transfer coating layer (4), a polyamide layer (5), a printing layer (6), a color ink layer (7) and a pressure-sensitive adhesive layer (8) arranged in sequence from top to bottom; 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 local transfer coating (4), and the bottom portion is divided into the local transfer coating (4) and the portion below the local transfer coating (4). When observing the surface of the mark, 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 also displays the hidden laser information. When re-assembled, 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 embossed holographic information not covered by the local transfer coating (4) is further covered by the polyamide layer (5), thereby serving to hide the embossed holographic information; The thickness of the local transfer coating (4) is 0.8-3 microns; The method for preparing the laser covert anti-counterfeiting mark comprises the following steps: 1) applying a coating layer (2) below the plastic film layer (1); 2) performing embossing on the coating (2) to form an embossed holographic information layer (3); 3) coating the surface of the embossed holographic information layer (3) with a local transfer coating (4), wherein the embossed holographic information disappears after the coating; 4) applying a polyamide layer (5) on the local transfer coating (4); 5) printing on the polyamide layer (5) to form a printing layer (6), wherein information on the printing layer (6) includes variable information; 6) Applying a color ink layer (7), applying glue, and then die-cutting to form a laser-secret anti-counterfeiting mark; In step 2), the embossing is performed using an embossing information plate. When preparing the embossing information plate, a point light source encryption platemaking technology is used. After the embossing is completed, the laser information cannot be observed under natural light, but can be observed using a point light source. In step 3), the local transfer coating (4) is a local positioning coating, which is divided into two parts. The area corresponding to the variable information is fully coated, and the other positions are set as warning local coatings. When peeled off, a transparent laser effect with warning words appears. The variable information area is completely peeled off and a transparent laser effect appears. In step 3), the local 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 4), the coating process of the polyamide layer (5) 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 local transfer coating (4) and the molded holographic information layer (3) is 0.0010-0.0030N / mm.

2. The method for preparing a 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 laser covert anti-counterfeiting mark according to claim 1, characterized in that: The coating (2) is a transparent color layer, which is a colorless transparent color layer or a light-colored transparent color layer. After molding, a molded holographic information layer (3) is formed on the surface.

4. The method for preparing a laser covert anti-counterfeiting mark according to claim 1, characterized in that: The information of the printing layer (6) includes graphics and variable information, and a local covering layer (9) is provided above the plastic film layer (1) corresponding to the position of the variable information of the printing layer (6).

5. The method for preparing a laser covert anti-counterfeiting mark according to claim 4, characterized in that: A prompt text layer (10) is provided above the local covering layer (9).

6. The method for preparing a laser covert anti-counterfeiting mark according to claim 1, characterized in that: A release paper layer (11) is provided below the pressure-sensitive adhesive layer (8).

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