Micro-carving anti-counterfeiting gold stamping packaging paper and manufacturing method thereof

Abstract

The invention discloses miniature-carved anti-fake gold stamping packaging paper and a manufacturing method thereof.The miniature-carved anti-fake gold stamping packaging paper comprises a base material layer, a miniature-carved image-text layer is arranged on the surface of the base material layer, and the miniature-carved image-text layer comprises a laser carved pattern with the line width being 5-50 microns. According to the miniature-carved anti-fake gold stamping packaging paper and the manufacturing method thereof, the laser carved pattern with the line width being 5-50 microns and a three-dimensional microstructure with the depth being 10-200 microns are adopted on the miniature-carved image-text layer; the dynamic optical effect when the inclination angle is larger than or equal to 30 degrees is achieved through the high-precision miniature carving technology, and the imitation difficulty is high. And the anti-counterfeiting information layer is used for orthogonally arranging a miniature character region with the character height of 10-100 microns and a holographic diffraction region with the grid line density of 800-5000 lines / mm to form a multiple anti-counterfeiting mechanism. Meanwhile, the metal gilding layer is made of special metal raw materials such as gold, silver and copper alloy, and the anti-fake effect is further enhanced through the unique physical property of the metal gilding layer.

Description

Technical Field

[0001] The invention belongs to the technical field of hot stamping packaging paper, and in particular relates to micro-carved anti-counterfeiting hot stamping packaging paper and a manufacturing method thereof. Background Art

[0002] In the packaging industry, wrapping paper not only protects products and facilitates transportation and storage, but also carries the crucial functions of brand presentation and anti-counterfeiting. With increasingly fierce market competition and the continued emergence of counterfeit and substandard products, the anti-counterfeiting capabilities of traditional wrapping paper are increasingly insufficient. Traditional wrapping paper often features only simple printed patterns or logos, with limited anti-counterfeiting technology that makes it susceptible to counterfeiting. For example, ordinary printed anti-counterfeiting methods are easily replicated by high-precision printing equipment, failing to effectively safeguard product authenticity and brand equity.

[0003] Furthermore, existing packaging paper has limitations in terms of visual effects and information carrying capacity. Typical packaging paper lacks unique dynamic optical effects and rich microscopic information, making it difficult to attract consumers' attention and provide more product information. Furthermore, the manufacturing process of some traditional packaging paper is not sophisticated enough, and the material selection is limited, resulting in uneven quality and performance.

[0004] Therefore, the industry urgently needs to develop wrapping paper with high anti-counterfeiting performance, unique visual effects, and sophisticated manufacturing processes. The present invention's micro-engraved anti-counterfeiting gold-stamping wrapping paper and manufacturing method were developed precisely in this context, aiming to address the problems of existing wrapping paper and improve its overall performance and anti-counterfeiting level. Summary of the Invention

[0005] The purpose of the present invention is to provide a micro-carved anti-counterfeiting hot stamping packaging paper and a manufacturing method thereof, so as to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a micro-carved anti-counterfeiting gold-stamping packaging paper, comprising:

[0007] A substrate layer, wherein a micro-carved graphic layer is provided on the surface of the substrate layer, and the micro-carved graphic layer comprises a laser engraved pattern with a line width of 5-50 μm;

[0008] The metal hot stamping layer covers the micro-carved graphic layer, the surface of the metal hot stamping layer is provided with an anti-counterfeiting information layer containing fluorescent material or light-variable material, and the outer surface of the anti-counterfeiting information layer is covered with a transparent film layer.

[0009] Preferably, the micro-engraved graphic layer contains three-dimensional microstructures with a depth of 10-200 μm and exhibits a recognizable dynamic optical effect at an inclination angle of 30° or greater. This not only adds to the interest and appeal of the wrapping paper but also provides an additional safeguard against counterfeiting. Because this dynamic optical effect relies on high-precision micro-engraving technology, it is difficult for counterfeiters to replicate the effect, significantly enhancing the wrapping paper's anti-counterfeiting capabilities.

[0010] Preferably, the anti-counterfeiting information layer comprises a microtext area and a holographic diffraction area arranged orthogonally to each other, wherein the character height of the microtext area is 10-100 μm, and the grid line density of the holographic diffraction area is 800-5000 lines / mm. The microtext and the holographic diffraction area with high grid line density are combined to form a multiple anti-counterfeiting mechanism, which effectively protects the authenticity of the product and the rights and interests of the brand.

[0011] Preferably, the thickness of the metal hot stamping layer is 0.02-1.2 μm, the metal raw material is selected from at least one of gold, silver, and copper alloy, and the surface roughness Ra≤0.2 μm, which not only improves the aesthetics of the packaging paper, but also utilizes the special physical properties of these metals to enhance the anti-counterfeiting effect.

[0012] Preferably, the substrate layer is a composite structure with a thickness of 50-300 μm, comprising at least one layer of a material selected from paper, plastic film, or metal foil. Using a composite substrate layer can combine the advantages of multiple materials. Paper has good printing adaptability and environmental protection, while plastic film is waterproof, moisture-proof, and flexible.

[0013] The present invention also provides a method for manufacturing micro-carved anti-counterfeiting gold-stamping packaging paper, which specifically comprises the following steps:

[0014] S1. Substrate pretreatment: corona treatment of the substrate layer to a surface tension of 38-52 dyn / cm;

[0015] S2. Micro-carving: Micro-structures are created using a 532nm pulsed laser at a power of 5-20W and a scanning speed of 100-500mm / s.

[0016] S3. Hot stamping layer lamination: Depositing a metal layer by electron beam evaporation under vacuum conditions ≤ 10^-2Pa;

[0017] S4. Anti-counterfeiting information coating: Nanoimprint technology is used to transfer anti-counterfeiting images and text at a temperature of 80-120°C;

[0018] S5. Protective layer coating: Apply a UV curable resin layer with a thickness of 2-10μm and cure it with 365nm ultraviolet light.

[0019] Preferably, the laser engraving in step S2 adopts spatial light modulation technology to dynamically generate a composite microstructure containing at least three different depths, and can dynamically adjust the focus and scanning mode of the laser according to the preset pattern and requirements to generate a composite microstructure containing at least three different depths.

[0020] Preferably, the anti-counterfeiting information layer in step S4 uses fluorescent ink containing rare earth elements, the Y2O3:Eu3+ phosphor content in the ink is 5-15wt%, and the particle size distribution D50 is 2-5μm, which can ensure the visibility of the fluorescent effect and the stability and printing adaptability of the ink.

[0021] Preferably, after the metal is deposited in step S3, an annealing treatment is performed at a temperature of 150-250° C. for 5-30 minutes. After the annealing treatment, the hardness, toughness and adhesion of the metal hot stamping layer are optimized, thereby improving the durability and stability of the wrapping paper.

[0022] Preferably, a quality inspection process is also included after step S5, using a combined inspection system including a white light interferometer and a fluorescence spectrometer to perform online inspection of the micro-carved structure depth tolerance of ±5% and the hot stamping layer thickness tolerance of ±10%, to ensure that the product quality meets the standards and effectively improve the product qualification rate and reliability.

[0023] Compared with the prior art, the technical effects and advantages of the present invention are as follows: the micro-carved anti-counterfeiting hot stamping packaging paper and the manufacturing method thereof,

[0024] The micro-engraved anti-counterfeiting gold-stamping packaging paper of this invention utilizes high-precision micro-engraving technology to achieve a dynamic optical effect at tilt angles of 30° or greater in the micro-engraved graphic layer, using laser-engraved patterns with a line width of 5-50 μm and three-dimensional microstructures with a depth of 10-200 μm. This makes counterfeiting extremely difficult. The anti-counterfeiting information layer orthogonally arranges a micro-text area with a character height of 10-100 μm and a holographic diffraction area with a grid line density of 800-5000 lines / mm, creating a multi-layered anti-counterfeiting mechanism. Furthermore, the metal stamping layer is made of special metals such as gold, silver, and copper alloys, whose unique physical properties further enhance the anti-counterfeiting effect.

[0025] The three-dimensional microstructure of the micro-engraved graphic layer of this invention creates rich light and shadow variations and dynamic optical effects under different lighting and viewing angles, adding to its appeal. The holographic diffraction zone of the anti-counterfeiting information layer produces a vibrant diffraction pattern, displaying varying colors and image changes at different angles. Furthermore, the micro-text zone can carry more microscopic information, satisfying consumers' demand for product information and enhancing brand presentation.

[0026] The present invention utilizes meticulous control over each step of the manufacturing process. For example, corona treatment is used to pre-treat the substrate to achieve a surface tension of 38-52 dyn / cm, laying a solid foundation for subsequent processing. Laser engraving utilizes spatial light modulation technology to dynamically generate composite microstructures. After metal deposition, an annealing treatment at 150-250°C for 5-30 minutes optimizes the performance of the metal foil layer. Anti-counterfeiting information is applied using rare earth fluorescent ink containing phosphors of a specific content and particle size. Finally, a combined detection system consisting of a white light interferometer and a fluorescence spectrometer performs online testing of key parameters, effectively improving product qualification and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] Figure 2 This is a schematic diagram of the cross-sectional structure of the micro-carved graphic layer of the present invention;

[0029] Figure 3 Schematic diagram of the cross-sectional structure of the anti-counterfeiting information layer of the present invention;

[0030] Figure 4 The following is a flowchart of the steps of the method for making the present invention.

[0031] In the figure: 1. Base material layer; 2. Micro-carved image layer; 3. Metal hot stamping layer; 4. Anti-counterfeiting information layer; 5. Transparent film layer. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] See also Figure 1-4 The present invention provides a technical solution: a micro-carved anti-counterfeiting gold-stamping packaging paper, comprising:

[0034] Substrate layer 1, a composite structure with a thickness of 50-300μm, consists of layers of paper, plastic film, or metal foil. Paper lends the wrapping paper excellent printability, facilitating the display of exquisite designs and text. It is also environmentally friendly, in line with current green development concepts. Plastic film provides excellent waterproof and moisture-proof properties, protecting the product from moisture damage in various environments. Its flexibility also prevents the wrapping paper from breaking during bending and other operations. The addition of metal foil enhances the wrapping paper's barrier properties, effectively preventing the product from being corroded by oxygen and moisture, thereby extending its shelf life.

[0035] The surface of the substrate layer 1 is provided with a micro-engraved graphic layer 2. This micro-engraved graphic layer 2 comprises a laser-engraved pattern with a line width of 5-50 μm and a three-dimensional microstructure with a depth of 10-200 μm, making the micro-engraved graphic layer 2 extremely unique. The high-precision laser engraving technology is difficult to imitate, increasing the anti-counterfeiting barrier of the packaging paper. The dynamic optical effect presented at an inclination angle of 30° or greater allows consumers to observe the changes in the pattern when observing the packaging paper, greatly attracting consumers' attention and improving product recognition.

[0036] The metal hot stamping layer 3 is covered on the micro-carved graphic layer 2. The surface of the metal hot stamping layer 3 is provided with an anti-counterfeiting information layer 4 containing fluorescent materials or light-variable materials. The outer surface of the anti-counterfeiting information layer 4 is covered with a transparent film layer 5, which plays a good protective role and prevents the anti-counterfeiting information layer 4 from being scratched and worn by the outside world, ensuring that the anti-counterfeiting information is always clear and complete, extending the service life of the wrapping paper, and maintaining the anti-counterfeiting and visual effects of the wrapping paper.

[0037] The micro-carved graphic layer 2 comprises a three-dimensional microstructure with a depth of 10-200 μm, and presents a recognizable dynamic optical effect when the tilt angle is ≥30°.

[0038] The anti-counterfeiting information layer 4 comprises a microtext area and a holographic diffraction area arranged orthogonally. The microtext area has a character height of 10-100 μm, and the holographic diffraction area has a line density of 800-5000 lines / mm. The anti-counterfeiting information layer 4 produces a colorful, ever-changing diffraction pattern at different angles. This unique visual effect not only serves as an anti-counterfeiting mark, but also enhances the product's visual appeal, providing consumers with a novel visual experience. Furthermore, the two anti-counterfeiting methods work together to form a powerful multi-layered anti-counterfeiting mechanism.

[0039] The metal foil layer 3 has a thickness of 0.02-1.2 μm and is made of at least one of gold, silver, and copper alloys. Its surface roughness, Ra, is ≤ 0.2 μm. The metal foil layer 3 not only presents a gorgeous luster, enhancing the aesthetics of the wrapping paper and attracting consumers, but also possesses the unique physical properties of these metals, such as their reflection and refraction of light, further enhancing the anti-counterfeiting effect. The unique optical characteristics created by the combination of different metals are difficult for counterfeiters to replicate, ensuring a smooth and even metal foil layer 3. This provides a good adhesion foundation for the subsequent application of the anti-counterfeiting information layer 4, ensuring smooth processing.

[0040] The substrate layer 1 is a composite structure with a thickness of 50-300 μm, comprising at least one layer of a material selected from paper, plastic film or metal foil.

[0041] The present invention also provides a method for manufacturing micro-carved anti-counterfeiting gold-stamping packaging paper, which specifically comprises the following steps:

[0042] S1. Substrate Pretreatment: Corona treatment is performed on substrate layer 1 to increase its surface tension to 38-52 dyn / cm. This treatment changes the molecular structure of the substrate surface, making it more active and significantly improving the adhesion between the substrate and subsequent coatings. This allows subsequent micro-engraved graphic layer 2 and metal hot stamping layer 3 to adhere more firmly to the substrate, preventing problems such as peeling and delamination, thereby ensuring the stability and quality of the overall packaging paper structure.

[0043] S2. Micro-carving: Micro-structures are engraved using a 532nm pulsed laser at a power of 5-20W and a scanning speed of 100-500mm / s. Spatial light modulation technology is then used to dynamically generate composite microstructures with at least three different depths. This combination of advanced laser engraving and spatial light modulation technology enables the precise engraving of complex and diverse micro-structure patterns to meet diverse design requirements.

[0044] S3. Hot stamping layer lamination: Depositing a metal layer by electron beam evaporation under vacuum conditions ≤ 10^-2Pa;

[0045] S4. Anti-counterfeiting information coating: Nanoimprint technology is used to transfer anti-counterfeiting images and text at a temperature of 80-120°C;

[0046] S5. Protective layer coating: Apply a UV curable resin layer with a thickness of 2-10μm and cure it with 365nm ultraviolet light.

[0047] In step S2, the laser engraving adopts spatial light modulation technology to dynamically generate a composite microstructure including at least three different depths.

[0048] In step S4, the anti-counterfeiting information layer 4 utilizes a fluorescent ink containing rare earth elements. The Y2O3:Eu3+ phosphor content in the ink is 5-15% by weight, and the particle size distribution (D50) is 2-5 μm. Nanoimprint technology enables precise reproduction of minute anti-counterfeiting images and text, ensuring the accuracy and clarity of the anti-counterfeiting information. The fluorescent ink containing rare earth elements emits bright and unique fluorescence under specific wavelengths of light. The optimal content and particle size distribution of the Y2O3:Eu3+ phosphor ensure both the visible fluorescent effect and the ink's stability and printability. This makes the anti-counterfeiting information imperceptible under normal light but clearly visible under specific detection conditions, further enhancing the anti-counterfeiting effectiveness.

[0049] After metal deposition in step S3, an annealing treatment is performed at a temperature of 150-250°C for 5-30 minutes. This high vacuum environment ensures the purity and uniformity of the metal deposition, resulting in a more stable quality of the metal foil layer 3. Annealing eliminates internal stresses generated during metal deposition, optimizes the metal's microstructure, and improves the hardness, toughness, and adhesion of the metal foil layer 3, making it more durable and less susceptible to deformation or shedding.

[0050] It also includes a quality inspection process performed after step S5, using a combined inspection system including a white light interferometer and a fluorescence spectrometer to perform online inspection of the micro-carved structure depth tolerance of ±5% and the hot stamping layer thickness tolerance of ±10%. The white light interferometer can measure the depth of the micro-carved structure with high precision to ensure that the quality of the micro-carved graphic layer 2 meets the design requirements; the fluorescence spectrometer can accurately detect the luminescence characteristics of the fluorescent raw materials in the anti-counterfeiting information layer 4 to ensure the effectiveness of the anti-counterfeiting information.

[0051] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A micro-carved anti-counterfeiting gold-stamping packaging paper, characterized in that: include: A substrate layer (1), wherein a micro-engraved graphic layer (2) is provided on the surface of the substrate layer (1), and the micro-engraved graphic layer (2) comprises a laser engraved pattern with a line width of 5-50 μm; A metal hot stamping layer (3) is provided, the metal hot stamping layer (3) covering the micro-carved graphic layer (2), the surface of the metal hot stamping layer (3) is provided with an anti-counterfeiting information layer (4) containing a fluorescent material or a light-variable material, and the outer surface of the anti-counterfeiting information layer (4) is covered with a transparent film layer (5).

2. The micro-carved anti-counterfeiting gold-stamping packaging paper according to claim 1, characterized in that: The micro-carved graphic layer (2) comprises a three-dimensional microstructure with a depth of 10-200 μm, and presents a recognizable dynamic optical effect when the tilt angle is ≥30°.

3. The micro-carved anti-counterfeiting gold-stamping packaging paper according to claim 1, characterized in that: The anti-counterfeiting information layer (4) comprises a micro-text area and a holographic diffraction area arranged orthogonally to each other, wherein the character height of the micro-text area is 10-100 μm, and the grid line density of the holographic diffraction area is 800-5000 lines / mm.

4. The micro-carved anti-counterfeiting gold-stamping packaging paper according to claim 1, characterized in that: The thickness of the metal hot stamping layer (3) is 0.02-1.2 μm, the metal raw material is selected from at least one of gold, silver and copper alloy, and the surface roughness Ra is ≤ 0.2 μm.

5. The micro-carved anti-counterfeiting gold-stamping packaging paper according to claim 1, characterized in that: The substrate layer (1) is a composite structure with a thickness of 50-300 μm, comprising at least one layer of material selected from paper, plastic film or metal foil.

6. A method for manufacturing the micro-carved anti-counterfeiting gold-stamping packaging paper according to any one of claims 1 to 5, characterized in that: The specific steps include: S1. Substrate pretreatment: The substrate layer (1) is corona treated to achieve a surface tension of 38-52dyn / cm; S2. Micro-carving: Micro-structures are created using a 532nm pulsed laser at a power of 5-20W and a scanning speed of 100-500mm / s. S3. Hot stamping layer lamination: Depositing a metal layer by electron beam evaporation under vacuum conditions ≤ 10^-2Pa; S4. Anti-counterfeiting information coating: Nanoimprint technology is used to transfer anti-counterfeiting images and text at a temperature of 80-120°C; S5. Protective layer coating: Apply a UV curable resin layer with a thickness of 2-10μm and cure it with 365nm ultraviolet light.

7. The method for manufacturing micro-carved anti-counterfeiting gold-stamping packaging paper according to claim 6, characterized in that: In step S2, the laser engraving adopts spatial light modulation technology to dynamically generate a composite microstructure including at least three different depths.

8. The method for manufacturing micro-carved anti-counterfeiting gold-stamping packaging paper according to claim 6, characterized in that: In the step S4, the anti-counterfeiting information layer (4) uses fluorescent ink containing rare earth elements, the content of Y2O3:Eu3+ fluorescent powder in the ink is 5-15wt%, and the particle size distribution D50 is 2-5μm.

9. The method for manufacturing micro-carved anti-counterfeiting gold-stamping packaging paper according to claim 6, characterized in that: After the metal is deposited in step S3, an annealing treatment is performed at a temperature of 150-250° C. for 5-30 minutes.

10. The method for manufacturing micro-carved anti-counterfeiting gold-stamping packaging paper according to claim 6, characterized in that: The method also includes a quality inspection process after step S5, which uses a combined inspection system including a white light interferometer and a fluorescence spectrometer to perform online inspection of the micro-carved structure depth tolerance of ±5% and the hot stamping layer thickness tolerance of ±10%.

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