Dual anti-counterfeit label and preparation method thereof

Abstract

The invention relates to the technical field of anti-counterfeiting, in particular to a double anti-counterfeiting label and a preparation method thereof.The double anti-counterfeiting label comprises bottom paper and a movable sheet, and a glue layer formed by AB glue printing, an inner anti-counterfeiting layer printed with inner anti-counterfeiting patterns and an isolation oil layer are sequentially attached to the bottom paper from the bottom layer to the surface layer; one side of the movable sheet is sticky and is removably attached to the backing paper, and the other side of the movable sheet is attached to an outer anti-counterfeiting layer printed with an outer anti-counterfeiting pattern. The inner anti-counterfeiting layer and the outer anti-counterfeiting layer are arranged to provide double anti-counterfeiting effects, the outer anti-counterfeiting layer serves as a visual identification layer, preliminary authenticity verification can be rapidly completed through naked eyes or a conventional detection means, and the efficient identification requirement in a daily circulation scene is met; the inner anti-counterfeiting layer is hidden between the isolation oil layer and the glue layer and can be exposed only after the movable sheet is removed, and secondary anti-counterfeiting verification is formed. In the same batch, the inner anti-counterfeiting layer supports setting of various anti-counterfeiting patterns, including static two-dimensional codes and variable two-dimensional codes.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of anti-counterfeiting technology, and more particularly relates to a double anti-counterfeiting label and a preparation method thereof. BACKGROUND

[0002] In modern commodity economy, anti-counterfeiting labels, as an important means to guarantee product authenticity traceability, maintain brand credibility and consumer rights and interests, have been widely used in many fields such as engine oil, tobacco and alcohol, tea, food, medicine and the like. The products in these fields are often the hardest hit areas of counterfeiting due to high market demand and high brand added value, and the technical level of the anti-counterfeiting label directly determines its resistance to counterfeiting.

[0003] In traditional ordinary printing anti-counterfeiting technology, as long as the anti-counterfeiting label is completely torn off from the product, its anti-counterfeiting effect will immediately fail. In view of this problem, there is a mature VOID anti-counterfeiting technology in the existing anti-counterfeiting technology field, the bottom layer uses pressure-sensitive adhesive (with easily broken fibers or microcapsule components) and is pre-set with VOID characters or brand logo, and the outer anti-counterfeiting layer is a plastic film printed with a customizable anti-counterfeiting pattern. When the VOID anti-counterfeiting label is torn off, the adhesive layer is broken, not only the VOID characters or brand logo can be shown, but also irreversible traces can be generated, which physically prevents the complete transfer of the anti-counterfeiting label and loses the anti-counterfeiting effect, thereby improving the anti-counterfeiting reliability.

[0004] However, the paper structure used in this VOID anti-counterfeiting technology is relatively simple, and the bottom layer only relies on a single layer of pressure-sensitive adhesive to achieve the basic trace leaving function. Due to the limitation of this single structure, it can only pre-set a simple and fixed anti-counterfeiting pattern, such as a brand logo, in the bottom layer within the same production batch. The single structure and simple fixed pattern greatly reduce the anti-counterfeiting level and the imitation threshold of the VOID anti-counterfeiting label. Criminals can analyze the adhesive composition through reverse engineering and copy the outer pattern to manufacture counterfeit labels that look similar. Moreover, the raw material cost and processing cost of the VOID anti-counterfeiting label are higher, which brings a heavy cost burden to product merchants. SUMMARY

[0005] The purpose of the embodiments of the present application is to provide a double anti-counterfeiting label and a preparation method thereof, so as to solve the technical problem in the prior art that the bottom layer of the VOID anti-counterfeiting label can only pre-set a simple and fixed anti-counterfeiting pattern within the same production batch.

[0006] To achieve the above object, the technical scheme adopted by the present application is: provide a double anti-fake label, the double anti-fake label includes base paper and removable sheet, the base paper sequentially has the glue layer formed by AB glue printing, the inner anti-fake layer printed with the inner anti-fake pattern, the isolation oil layer from the bottom layer to the surface layer, one side of the removable sheet has adhesion and is removably attached to the base paper, the other side of the removable sheet is attached to the outer anti-fake layer printed with the outer anti-fake pattern. The inner anti-fake layer is formed on the glue layer by the way of inkjet printer spraying.

[0007] Optionally, one side of the glue layer is a printing surface, and the other side of the glue layer is an adhesive surface. The adhesive surface is attached to the base paper, and the printing surface is used for printing the inner anti-fake pattern, and the adhesion of the printing surface is less than the adhesion of the adhesive surface. A layer of white ink layer is printed between the glue layer and the inner anti-fake layer.

[0008] Optionally, the removable sheet is any one of copper plate paper, kraft paper, writing paper, PET film, PE film, non-woven fabric and synthetic paper. The removable sheet is provided with a tear line.

[0009] Optionally, a preparation method of a double anti-fake label is provided, comprising the following steps: S1, printing AB glue on the base paper to form a glue layer; S2, spraying the inner anti-fake layer on the glue layer, and baking to preliminarily dry the ink of the inner anti-fake layer; S3, printing isolation oil on the inner anti-fake layer to form an isolation oil layer; S4, the surface of the isolation layer is compounded with the removable sheet, so that the double anti-fake label is prepared, wherein the surface of the removable sheet has an outer anti-fake layer, and the double anti-fake label is baked and dried.

[0010] Optionally, when printing the glue layer, a frosted glue coating roller with a release layer on the surface is used.

[0011] Optionally, after printing the glue layer, a release film is attached to the glue layer, and the inkjet printer automatically removes the release film before printing the inner anti-fake layer on the glue layer.

[0012] Optionally, after removing the release film, a layer of white ink layer is formed on the surface of the glue layer by the inkjet printer, and after preliminary drying, the inner anti-fake layer is sprayed. Optionally, the isolation oil comprises 68%-78% base film-forming varnish, 12%-22% stripping varnish and 5%-15% printable varnish by mass ratio. The base film-forming varnish comprises: 40% methyl methacrylate-butyl acrylate copolymer; 50% mixture of ethyl acetate and isopropyl alcohol, ethyl acetate and isopropyl alcohol added in a mass ratio of 3:2; 5% polydimethylsiloxane; 3% polyoxyethylene polyoxypropylene propylene glycol ether; 2% hydroxyethyl cellulose; The stripping varnish comprises, by mass ratio: 42% dimethyl sulfoxide; 17% triethanolamine; 15% propylene glycol methyl ether acetate; 8% polyoxyethylene sorbitan fatty acid ester; 5% ethylene glycol monobutyl ether; 5% hydroxyethyl cellulose; 4% benzotriazole; 4% polyether-modified polydimethylsiloxane; The printable varnish comprises, by mass ratio: 30% aliphatic waterborne polyurethane dispersion; 60% mixture of deionized water and propylene glycol methyl ether, deionized water and propylene glycol methyl ether added in a mass ratio of 4:1; 5% octylphenol polyoxyethylene ether; 3% glycerol; 2% dodecyl dimethyl betaine.

[0013] Optionally, the oiling roller for printing the isolation oil adopts a 400-mesh anilox roller.

[0014] Optionally, the ink is dried and cured by using a movable oven, the drying temperature is 90°C, the drying time of a single double security label is set to 3-6 min.

[0015] The application provides a double anti-counterfeiting label and a preparation method thereof. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor.

[0017] Figure 1 The preparation method of the double anti-counterfeiting label provided by the embodiments of the present application is shown in the flowchart. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0019] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications will also change accordingly.

[0020] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0021] As an important means to protect the authenticity of products, maintain brand reputation and consumer rights and interests, the technical level of anti-counterfeit label directly determines its resistance to counterfeiting. There is a very mature VOID anti-counterfeiting technology in the existing anti-counterfeiting technology field. Due to the limitation of single layer pressure sensitive adhesive of VOID anti-counterfeiting label, it can only preset a simple and fixed anti-counterfeiting pattern, such as brand logo, in the bottom layer within the same production batch. The single structure and simple fixed pattern greatly reduce the anti-counterfeiting level and imitation threshold of VOID anti-counterfeiting label, which easily damages the product brand and consumer interests.

[0022] In order to solve the above problems, the present application provides a double anti-counterfeiting label, which comprises a base paper and a removable sheet. The base paper is sequentially attached with a glue layer formed by AB glue printing, an inner anti-counterfeiting layer printed with an inner anti-counterfeiting pattern, and a separation oil layer from the bottom layer to the surface layer. One side of the removable sheet is adhesive and removably attached to the base paper, and the other side of the removable sheet is attached to an outer anti-counterfeiting layer printed with an outer anti-counterfeiting pattern. The inner anti-counterfeiting layer is formed on the glue layer by inkjet printer spraying.

[0023] The base paper of the double anti-counterfeiting label serves as a temporary carrier during the production, transportation and storage of the label, supports all the structures on the upper layer, ensures that the double anti-counterfeiting label remains flat and complete before use, and avoids damage to the layers due to external pressure and friction. The surface of the base paper is usually treated with release treatment (such as silicon oil coating), so that the double anti-counterfeiting label can be easily peeled off from the base paper during use, and conveniently pasted on the surface of the anti-counterfeiting object. The glue layer formed by AB glue printing stably connects the base paper and the inner anti-counterfeiting layer, and after peeling off the base paper, the glue layer can continuously fix the upper layer structure such as the inner anti-counterfeiting layer and the separation layer on the anti-counterfeiting product.

[0024] The inner anti-counterfeiting layer is the core anti-counterfeiting area of the label, usually contains anti-counterfeiting information with high security, and the inner anti-counterfeiting pattern can be set as a static two-dimensional code or a variable two-dimensional code. The inner anti-counterfeiting layer has a secondary verification function. When the removable sheet is torn open, the inner anti-counterfeiting layer is exposed, and the user or the verification party can carry out secondary anti-counterfeiting verification by checking the information of the inner anti-counterfeiting layer and the product record information, so as to further confirm the authenticity of the product, and effectively make up for the risk that the outer anti-counterfeiting layer may be counterfeited. The inner anti-counterfeiting code is formed on the glue layer by the spraying mode of an inkjet printer, which can avoid the situation that the ink is brushed and the glue is stuck on the roller when the inner anti-counterfeiting code is directly printed on the glue layer.

[0025] The isolation oil layer can effectively block the direct contact between the removable sheet and the glue layer, which can help to tear off the upper removable sheet, and protect the inner anti-counterfeiting pattern printed on the glue layer from being adhered and falling off when the removable sheet is torn open, so that the inner anti-counterfeiting pattern can be completely retained on the anti-counterfeiting object after the removable sheet is torn open.

[0026] The removable sheet is a sheet-shaped material with low adhesion on the bottom surface and can be removably attached to the bottom paper of the double anti-counterfeiting label. The surface of the removable sheet is printed with an outer anti-counterfeiting pattern (such as a common two-dimensional code, a trademark pattern, and an anti-counterfeiting texture), which is used as an intuitive first-level anti-counterfeiting identification for users to preliminarily identify the authenticity. When the user needs to verify, the removable sheet can be easily torn open manually without the aid of tools. On the other hand, by means of physical destruction, the label is prevented from being transferred and reused as a whole (once torn open, it cannot be restored to its original state, avoiding secondary use).

[0027] The outer anti-counterfeiting layer printed with the outer anti-counterfeiting pattern is formed by printing the outer anti-counterfeiting pattern on the removable sheet, and serves as the anti-counterfeiting identification first seen by the user, bearing the responsibility of first-level verification. The clear trademark pattern or common two-dimensional code information of the outer anti-counterfeiting layer can be quickly and intuitively verified by the user through simple scanning operation without complex operation, especially convenient for intermediaries to verify product information, meet the daily preliminary anti-counterfeiting needs, and build the first barrier of anti-counterfeiting, while forming a basic block to low-cost counterfeiting behavior.

[0028] In an embodiment of the present application, one side of the glue layer is a printing surface, and the other side of the glue layer is an adhesive surface; The adhesive surface is attached to the bottom paper, and the adhesion of the printing surface is less than that of the adhesive surface; A white ink layer is further printed between the glue layer and the inner anti-counterfeiting layer.

[0029] It should be noted that due to the lower adhesion of the printing surface and the higher adhesion of the adhesive surface, the glue layer can be firmly attached to the lower base paper, and when the double anti-fake label is used, the base paper is first torn off, and then the double anti-fake label can be firmly attached to the product to be prevented by the adhesive surface of the glue layer; the lower adhesion of the printing surface promotes the separation of the upper removable sheet which is a tearable part from the glue layer, thereby facilitating the exposure of the inner anti-fake layer. This adhesion difference design also ensures the stability of the base paper printed with the inner anti-fake layer, providing structural support for the smooth progress of the subsequent anti-fake verification steps. At the same time, the AB glue material itself has good weather resistance and adhesion strength, which can adapt to different use environments and ensure that the label maintains complete physical properties and anti-fake function in the product circulation link.

[0030] In addition, a layer of white ink layer is printed between the glue layer and the inner anti-fake layer, which provides a uniform and pure background color for the inner anti-fake pattern, making the inner anti-fake pattern more vivid in color and clearer in edge, and improving the recognition and visual effect of the pattern. When the removable sheet is torn off, the inner anti-fake pattern under the white ink layer is clearly visible, facilitating the user to perform secondary verification.

[0031] In an embodiment of the present application, the removable sheet is obtained by coating a glue layer on the bottom surface of any one of copper paper, kraft paper, writing paper, PET film, PE film, non-woven fabric and synthetic paper, and the removable sheet can be selected according to actual production needs and application product types. At the same time, the removable sheet is provided with a tear line, one of which is a directly printed line that needs to be torn by the user along the line, serving as an indication. The other is a broken point type cutting line, which is convenient for the user to tear off. After tearing, it is divided into two parts, one part remains on the label, and the other part can be torn off and attached beside the remaining part, and the two parts can be spliced into a complete outer anti-fake pattern. This splicing feature is a kind of anti-fake means. The complete splicing effect is the identification of the genuine product, and only the genuine label can realize complete information presentation through standard operation. Counterfeit products often have problems such as misalignment of the pattern after splicing due to the inability to accurately reproduce the tear line and information segmentation logic, forming an intuitive anti-fake judgment basis.

[0032] When the user carries out anti-counterfeiting verification on the double anti-counterfeiting label of the application, first, the user can preliminarily determine the authenticity of the product by scanning the outer anti-counterfeiting code or retrieving the basic anti-counterfeiting information from the outer anti-counterfeiting pattern according to the exclusive anti-counterfeiting means provided by the brand; then, the user tears the removable sheet along the tear line provided on the removable sheet, a part of which is tightly retained on the original label backing paper, and the other part can be completely torn off, and the torn part needs to be reattached to the specified position beside the label according to the product packaging prompt, when the retained part and the reattached part are accurately connected and constitute a complete outer anti-counterfeiting pattern without misalignment and loss, the double anti-counterfeiting label is verified again; finally, the user completely tears off the retained removable sheet, so that the inner anti-counterfeiting layer on the glue layer is completely exposed, the product core traceability information is obtained by scanning the inner anti-counterfeiting pattern (static two-dimensional code or variable two-dimensional code), and the authenticity of the product is finally determined comprehensively in combination with the verification result.

[0033] Please refer to Figure 1 In an embodiment of the present application, a preparation method of a double anti-counterfeiting label is provided, and the preparation method comprises the following steps: S1, printing AB glue on the backing paper to form a glue layer; S2, spraying an inner anti-counterfeiting layer on the glue layer, and baking to preliminarily dry the ink of the inner anti-counterfeiting layer; S3, printing a separation oil on the inner anti-counterfeiting layer to form a separation oil layer; S4, compounding a removable sheet on the surface of the separation layer, so as to obtain the double anti-counterfeiting label, wherein the surface of the removable sheet has an outer anti-counterfeiting layer, and the double anti-counterfeiting label is baked and dried again.

[0034] In the preparation method of the double anti-counterfeiting label provided in an embodiment of the present application, step S1 prints the AB glue on the base paper to form a glue layer, so as to provide an attachment basis for subsequent functional layers by the good bonding performance of the AB glue, and realize the pasting function of the label and the pasted object; step S2 sprays the inner anti-counterfeiting layer on the glue layer and bakes to preliminarily dry the ink of the inner anti-counterfeiting layer, so as to completely spray the inner anti-counterfeiting pattern on the surface of the glue layer to avoid the ink bleeding caused by printing, and fix the form of the inner anti-counterfeiting layer by preliminary baking and drying, so as to prevent the ink from bleeding, blurring or information damage in the subsequent processing process; step S3 prints the release oil on the inner anti-counterfeiting layer to form a release oil layer, if the release oil layer is not provided, the movable sheet and the glue layer will be directly contacted and adhered, which causes the upper movable sheet to be easily broken or residual when being torn off, and it is difficult to realize complete tearing; step S4 composites the movable sheet on the surface of the release layer, so as to give the movable sheet the removability, facilitate the verification by removing, and protect the lower structure from being damaged in daily use, and the outer anti-counterfeiting layer is printed on the movable sheet, which can clearly present the outer anti-counterfeiting information as the visual anti-counterfeiting identification, and form a double anti-counterfeiting system with the inner anti-counterfeiting layer to improve the anti-counterfeiting level of the label, and finally, the double anti-counterfeiting label is baked to dry, so as to dry each layer, ensure the stability, weather resistance and durability of the two anti-counterfeiting information, ensure that the anti-counterfeiting performance of the label is not affected in long-term use, and firmly combine each layer structure to form a complete double anti-counterfeiting label.

[0035] In another embodiment of the present application, when the glue layer is printed, a frosted glue coating roller coated with a release layer is used. It should be noted that when the glue layer is printed, the glue is printed by using the frosted glue coating roller coated with a release layer, which plays a role of isolation and anti-adhesion by using the low surface energy characteristic of the surface of the release layer, can effectively reduce the adhesion of the glue and the printing roller, ensure that the glue can be more uniformly and completely transferred to the base paper, avoid the distortion of the anti-counterfeiting pattern caused by the uneven coating of the glue or the subsequent printing, and facilitate the cleaning and maintenance of the glue coating roller, ensure the stability of the coating quality in the continuous production process, and further provide a uniform and consistent basis for the attachment of the subsequent functional layers, and improve the preparation quality of the entire anti-counterfeiting label.

[0036] In another embodiment of the present application, after the glue layer is printed, a release film is attached to the glue layer, and the inkjet printer automatically tears off the release film before printing the inner anti-counterfeiting layer on the glue layer, which can prevent the glue layer from being adhered to the equipment or adhered to foreign matters during the transfer process of entering the next production process, and provide strong support for the improvement of production efficiency and the guarantee of product yield.

[0037] In another embodiment of the present application, after the release film is removed, a layer of white ink is sprayed on the surface of the glue layer using an inkjet printer, and after preliminary drying, the inner anti-counterfeiting layer is sprayed. The white ink layer serves as a high hiding power base, which can cover the possible color difference or minor defects of the glue layer, making the special ink of the inner anti-counterfeiting layer (such as fluorescent ink, micro-text ink) more vivid in color and clearer in pattern, avoiding the difficulty in identifying anti-counterfeiting information caused by the light transmission or background color of the glue layer. This allows the inner anti-counterfeiting layer to print monochromatic or colored variable two-dimensional codes or other patterns, improving the information carrying capacity and visual recognition of the inner anti-counterfeiting layer. The inkjet printer sprays white ink in a non-contact manner, with ink droplets accurately sprayed onto the surface of the glue layer, which can prevent the mixing of the white ink layer and the anti-counterfeiting layer material before drying, causing the pattern to be blurred and the function to fail, ensuring that the two-layer structure is clear and stable in performance, and relying on the adhesion of the glue layer to tightly bond the white ink layer, the inner anti-counterfeiting layer and the substrate, ensuring that they do not fall off or break during subsequent use. After the white ink layer is preliminarily dried and fixed, the inner anti-counterfeiting layer is sprayed, avoiding physical extrusion and scratching of the glue layer that has not completely solidified, preventing deformation or adhesion of the glue layer to the printing equipment, and ensuring the integrity of the glue layer structure.

[0038] In another embodiment of the present application, the separation oil comprises 68%-78% base film-forming gloss oil, 12%-22% stripping gloss oil, and 5%-15% printable gloss oil by mass ratio. The base film-forming gloss oil comprises, by mass ratio: 40% methyl methacrylate-butyl acrylate copolymer; 50% mixture of ethyl acetate and isopropyl alcohol, with a mass ratio of ethyl acetate to isopropyl alcohol of 3:2; 5% polydimethylsiloxane; 3% polyoxyethylene polyoxypropylene glycol ether; and 2% hydroxyethyl cellulose.

[0039] The stripping gloss oil comprises, by mass ratio: 42% dimethyl sulfoxide; 17% triethanolamine; 15% propylene glycol methyl ether acetate; 8% polyoxyethylene sorbitan fatty acid ester; 5% ethylene glycol monobutyl ether; 5% hydroxyethyl cellulose; 4% benzotriazole; and 4% polyether-modified polydimethylsiloxane. The printable gloss oil comprises, by mass ratio: 30% aliphatic waterborne polyurethane dispersion; 60% mixture of deionized water and propylene glycol methyl ether, with a mass ratio of deionized water to propylene glycol methyl ether of 4:1; 5% octylphenol polyoxyethylene ether; 3% glycerol; and 2% dodecyl dimethyl betaine.

[0040] The role of the base film-forming gloss oil is to form a continuous film, provide a basic structure, enhance the release effect, adjust the rheological property to ensure uniform coating, and ensure the stability of the release layer. The 40% methyl methacrylate-butyl acrylate copolymer in the base film-forming gloss oil serves as the main film-forming body, and the mixture of 50% ethyl acetate and isopropyl alcohol with a mass ratio of 3:2 can ensure uniform dispersion of the resin and the formation of a continuous film. The 5% polydimethylsiloxane provides low surface energy characteristics to enhance the release effect, and the 3% polyoxyethylene polyoxypropylene glycol ether and 2% hydroxyethyl cellulose adjust the rheological property of the system to ensure uniformity of coating and provide the release layer with basic film-forming ability and structural stability.

[0041] The role of the release gloss oil is to reduce the adhesion between the removable sheet and the glue layer, ensure the stable implementation of the release function, and at the same time consider environmental adaptability and glue layer protection, to ensure that the removable sheet can be easily torn from the glue layer. The 42% dimethyl sulfoxide and 17% triethanolamine in the release gloss oil work together to reduce the adhesion between the removable sheet and the glue layer, providing the removable sheet with a release function. The 15% propylene glycol methyl ether acetate and 5% ethylene glycol monobutyl ether ensure the dissolution and dispersion of each component, while improving low-temperature fluidity and adapting to different environments. The 8% polyoxyethylene sorbitan fatty acid ester and 4% polyether-modified polydimethylsiloxane optimize the printing effect, reduce defects in the release oil layer, and reduce surface energy, assisting the release of the removable sheet and improving the implementation effect of the release function. The 5% hydroxyethyl cellulose moderately increases the viscosity of the release gloss oil, ensuring uniform adhesion of the release oil layer. The 4% benzotriazole has film-forming properties and a physical protective effect on the contact surface with the base paper.

[0042] The role of the printable gloss oil is to give the film layer flexibility and surface affinity, ensure environmental friendliness and leveling, and optimize surface tension to adapt to subsequent printing. The 30% aliphatic waterborne polyurethane dispersion in the printable gloss oil gives the film layer flexibility and surface affinity, the 60% mixture of deionized water and propylene glycol methyl ether with a mass ratio of 4:1 ensures environmental friendliness and leveling, and the 5% octylphenol polyoxyethylene ether, 3% glycerol, and 2% dodecyl dimethyl betaine work together to optimize the surface tension, ensuring that the surface energy of the release layer adapts to the printing process of the subsequent outer anti-counterfeiting layer, avoiding poor printing.

[0043] Overall, the release oil can form a release oil layer with good release, protection, and printing adaptability, ensuring the structural stability and anti-counterfeiting performance of the double anti-counterfeiting label.

[0044] In another embodiment of the present application, the oiling roller used for printing the release oil is a 400-mesh anilox roller. The mesh count of the anilox roller directly determines the density and volume of the cells on its surface. A 400-mesh anilox roller has 400 cells per inch of length. Each cell is in the shape of an inverted pyramid, typically 15-20 μm deep and approximately 30-35 μm wide, resulting in a fine and uniform cell structure. This fine cell structure perfectly matches the fluidity of the mixed varnish, allowing the release oil to be printed in a thin and uniform manner on the surface of the inner security layer. The fine coating path ensures that the release oil forms a smooth, dense film after drying, avoiding sagging and accumulation caused by excessive release oil. This prevents the formation of glue edges at the edges of the inner security layer, and also avoids the situation where too little application can result in the release oil layer failing to form a complete, continuous film, resulting in partial exposure or uneven coating.

[0045] In another embodiment of the present application, a portable oven is used to bake the ink at a temperature of 90°C. The baking time of a single double anti-counterfeiting label is set to 3-6 minutes for drying and curing. The portable design enables continuous production and improves processing efficiency. The 90°C temperature can not only quickly volatilize the solvent in the ink, allowing the ink of the inner and outer anti-counterfeiting layers and the isolation oil layer to fully dry and cure, but also prevent high temperature from damaging the label substrate, glue layer, or anti-counterfeiting information. The precise baking time of 3-6 minutes ensures that the drying process is completed in a short time, ensuring that the ink is thoroughly dried to enhance its adhesion, friction resistance, and stability, preventing problems such as smudges and sticking in subsequent processing, but also avoiding material aging, deformation, or invalidation of the anti-counterfeiting information due to excessive baking time. Ultimately, while ensuring the firm bonding of the various layers of the label structure and the stability of the anti-counterfeiting performance, both production efficiency and product quality are taken into account.

[0046] The present invention is further described below by means of specific examples: Example 1 A method for preparing a double anti-counterfeiting label, including the following steps: S1. The coating roller coated with a release layer evenly prints AB glue on the base paper to form a glue layer, and a release film is applied to the printed surface.

[0047] S2. After the release film is torn off by the inkjet printer, a layer of white ink is sprayed on the printing surface, the white ink is baked to dry, and the inner anti-counterfeiting layer is printed on the white ink layer, which is then preliminarily dried and solidified.

[0048] S3, 400 mesh anilox roller prints isolation oil on the inner anti-counterfeiting layer to form an isolation layer. The isolation oil contains 73% basic film-forming varnish, 17% peeling varnish and 10% printable varnish by mass.

[0049] The base film-forming gloss oil comprises, by mass ratio: 40% methyl methacrylate-butyl acrylate copolymer; 50% a mixture of ethyl acetate and isopropyl alcohol, the mass ratio of ethyl acetate to isopropyl alcohol being 3:2; 5% polydimethylsiloxane; 3% polyoxyethylene polyoxypropylene glycol ether; and 2% hydroxyethyl cellulose.

[0050] The peeling gloss oil comprises, by mass ratio: 42% dimethyl sulfoxide; 17% triethanolamine; 15% propylene glycol methyl ether acetate; 8% polyoxyethylene sorbitan fatty acid ester; 5% ethylene glycol monobutyl ether; 5% hydroxyethyl cellulose; 4% benzotriazole; and 4% polyether-modified polydimethylsiloxane.

[0051] The printable gloss oil comprises, by mass ratio: 30% aliphatic waterborne polyurethane dispersion; 60% a mixture of deionized water and propylene glycol methyl ether, the mass ratio of deionized water to propylene glycol methyl ether being 4:1; 5% octylphenol polyoxyethylene ether; 3% glycerol; and 2% dodecyl dimethyl betaine.

[0052] S4, the release layer is printed on the inner anti-counterfeiting layer to form a release layer, and the release layer comprises 75% base film-forming gloss oil, 16% peeling gloss oil, and 9% printable gloss oil; the copper plate paper is replaced with a PET film; and the baking time of a single double anti-counterfeiting label is set to 5 min for baking and drying.

[0053] Example 2 A method for preparing a double anti-counterfeiting label comprises the following steps: Example 2 is based on example 1, and the difference lies in that a release layer is printed on the inner anti-counterfeiting layer using release oil, the release oil comprises 75% base film-forming gloss oil, 16% peeling gloss oil, and 9% printable gloss oil; the copper plate paper is replaced with a PET film; and the baking time of a single double anti-counterfeiting label is set to 5 min for baking and drying.

[0054] Example 3 A method for preparing a double anti-counterfeiting label comprises the following steps: Example 3 is based on example 1, and the difference lies in that a release layer is printed on the inner anti-counterfeiting layer using release oil in example 3, the release oil comprises 75% base film-forming gloss oil, 16% peeling gloss oil, and 9% printable gloss oil; the copper plate paper is replaced with a synthetic paper; and the baking time of a single double anti-counterfeiting label is set to 6 min for baking and drying.

[0055] Comparative Example 1, which is different from example 1 in that a glue layer is formed by printing pressure-sensitive adhesive in the comparative example, and the adhesion of the adhesive surface is consistent with that of the printed surface.

[0056] Comparative Example 2, the difference between this comparative example and Example 1 is that the double security label prepared in this comparative example does not have an isolating oil layer.

[0057] Comparative Example 3, the difference between this comparative example and Example 1 is that the isolating oil used in this comparative example comprises 73% base film-forming gloss oil and 27% stripping gloss oil.

[0058] Peeling strength test Test standard: refer to GB / T 2792-2014 "Determination of Adhesive Tape Peeling Strength", adopt the test method of 180° peeling strength of single-sided adhesive tape and anti-adhesive material, test the peeling force required for the removable sheet to peel off the glue layer.

[0059] Environmental conditions: temperature 23±1℃, relative humidity 50%±5%.

[0060] Equipment parameters: constant speed tensile testing machine, peeling speed 300mm / min, test sample width 25mm.

[0061] Sample processing: each example and each comparative example needs to prepare 3 identical samples, after the sample preparation is completed, stand for 24h in the specified test environment; then the peeling strength test is carried out on the 3 samples of each example respectively, and finally the average value of the peeling force obtained by 3 times of test is taken as the average peeling force data of this example, unit is N / 25mm (peeling force unit, reflecting the stress size when the removable sheet is peeled off).

[0062] Table 1, peeling strength and peeling state record table of each example The peeling strength test is carried out on the double security label prepared for each example, and according to Table 1, it is analyzed that: (1) Examples 1-3 are the core technical solutions of the present application, and the average peeling force of the three is in the range of 1.52-2.18N / 25mm, the removable sheet can be stably adhered to the base paper, and has excellent effect of being easily torn off, which not only meets the needs of users to easily remove the removable sheet to verify the inner security layer, but also avoids accidental falling of the sheet in daily use. And the technical solution of the present application has good process stability, and different substrates and parameter adjustments can maintain reliable removable performance.

[0063] (2), the average peeling force (2.82N / 25mm) of the comparative example 1 is higher than that (1.85N / 25mm) of the example 1. The AB adhesive of the example 1 has differentiated adhesion of high adhesion between the adhesive surface and the base paper and low adhesion between the printing surface and the removable sheet, which is suitable for the removable requirement. The pressure-sensitive adhesive of the comparative example 1 has no differentiated adhesion design, and the overall adhesion is too high, which leads to a sharp increase in peeling resistance. The sample needs a larger peeling force to realize the peeling of the removable sheet from the glue layer, which is easy to damage the removable sheet, indicating that the AB adhesive is the key material to realize the qualified removable performance.

[0064] (3), the average peeling force (3.34N / 25mm) of the comparative example 2 is much higher than that (1.85N / 25mm) of the example 1. The example 1 uses copper plate paper, and the bottom surface of the copper plate paper has adhesion, which can form stable adhesion with the glue layer. Since no isolation oil layer is provided in the comparative example 2, the glue layer directly contacts the bottom surface of the copper plate paper, which requires overcoming a larger adhesion force during peeling, not only leading to a significant increase in peeling resistance, but also lacking the buffering and isolation effect of the isolation oil layer, the copper plate paper is easy to stick to the inner anti-fake layer or even tear and damage during peeling, which seriously affects the removable performance and integrity of the label, which fully proves the indispensability of the isolation oil layer in realizing the removable performance of the double anti-fake label.

[0065] (4), the isolation oil of the comparative example 3 has no printable gloss oil component, and the peeling gloss oil accounts for 27%. The average peeling force (0.95N / 25mm) of the comparative example 3 is lower than that (1.85N / 25mm) of the example 1. The 10% printable gloss oil in the isolation oil of the example 1 can optimize the surface tension of the isolation layer, and ensure that the isolation oil layer is uniformly attached to the inner anti-fake layer. The comparative example 3 lacks printable gloss oil, the surface energy of the isolation layer is unbalanced, and the high proportion of peeling gloss oil leads to too smooth surface of the isolation layer, and the removable sheet is difficult to adhere.

[0066] The above only describes the preferred embodiments of the present application, and does not limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A dual security tag, characterized in that, The double anti-fake label comprises a base paper and a removable sheet, the base paper has, from the bottom layer to the surface layer, a glue layer formed by AB glue printing, an inner anti-fake layer printed with an inner anti-fake pattern, and an isolation oil layer, one side of the removable sheet is adhesive and is removably attached to the base paper, and the other side of the removable sheet is attached to an outer anti-fake layer printed with an outer anti-fake pattern. The inner anti-fake layer is formed on the glue layer by means of inkjet printing.

2. The dual security tag of claim 1, wherein: One side of the glue layer is a printing surface, and the other side of the glue layer is an adhesive surface. The adhesive surface is attached to the base paper, and the printing surface is used for printing the inner anti-fake pattern, and the adhesion of the printing surface is less than that of the adhesive surface. A white ink layer is printed between the glue layer and the inner anti-fake layer.

3. The dual security tag of claim 1, wherein: The removable sheet is any one of copper plate paper, kraft paper, writing paper, PET film, PE film, non-woven fabric, and synthetic paper. The removable sheet is provided with a tear line.

4. A method for producing a dual security tag, characterized by, The method comprises the following steps: S1, printing AB glue on the base paper to form a glue layer; S2, spraying the inner anti-fake layer on the glue layer, and baking to preliminarily dry the ink of the inner anti-fake layer; S3, printing isolation oil on the inner anti-fake layer to form an isolation oil layer; S4, combining the removable sheet with the surface of the isolation layer to obtain the double anti-fake label, wherein the surface of the removable sheet has an outer anti-fake layer, and the double anti-fake label is baked and dried.

5. The production method according to claim 4, characterized by: When printing the glue layer, a matte coating roller with a release layer on the surface is used.

6. The production method according to claim 4, characterized by: After printing the glue layer, a release film is attached to the glue layer, and the inkjet printer automatically removes the release film before printing the inner anti-fake layer on the glue layer.

7. The production method according to claim 6, wherein After removing the release film, a white ink layer is formed on the surface of the glue layer by means of inkjet printing, and after preliminary drying, the inner anti-fake layer is sprayed.

8. The production method according to claim 4, characterized by: The isolation oil comprises, by mass ratio, 68%-78% base film-forming varnish, 12%-22% stripping varnish, and 5%-15% printable varnish. The base film-forming varnish comprises, by mass ratio: 40% methyl methacrylate-butyl acrylate copolymer; 50% a mixture of ethyl acetate and isopropyl alcohol, with a mass ratio of ethyl acetate to isopropyl alcohol of 3:2; 5% polydimethylsiloxane; 3% polyoxyethylene polyoxypropylene glycol ether; 2% hydroxyethyl cellulose; The stripping varnish comprises, by mass ratio: 42% dimethyl sulfoxide; 17% triethanolamine; 15% propylene glycol methyl ether acetate; 8% polyoxyethylene sorbitan fatty acid ester; 5% ethylene glycol monobutyl ether; 5% hydroxyethyl cellulose; 4% benzotriazole; 4% polyether-modified polydimethylsiloxane; The printable varnish comprises, by mass ratio: 30% aliphatic water-based polyurethane dispersion; 60% a mixture of deionized water and propylene glycol methyl ether, with a mass ratio of deionized water to propylene glycol methyl ether of 4:1; 5% octylphenol polyoxyethylene ether; 3% glycerol; 2% dodecyl dimethyl betaine.

9. The production method according to claim 8, wherein The oiling roller used for printing the isolation oil is a 400-mesh screen roller.

10. The production method according to claim 4, wherein The ink is baked using a movable oven, with a baking temperature of 90°C, and the baking time of a single double anti-fake label is set to 3-6 min for drying and curing.

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