Magic particle feature recognition large label and preparation method thereof

Abstract

The present application belongs to the technical field of anti-counterfeiting identification, and particularly relates to a magic particle feature identification large label and a preparation method thereof. The large label comprises, from top to bottom, a first plastic film layer, a first adhesive layer, a random identification mark layer, a second printing layer, a base material layer, a digital information layer and a third adhesive layer. The random identification mark layer comprises, from top to bottom, a first printing layer, a second plastic film layer, a random physical feature layer, a third plastic film layer, a color ink layer and a second adhesive layer. The first printing layer information comprises variable information. The random physical feature layer is composed of random physical features and adhesive. There is a corresponding relationship between the variable information and the random physical features. The digital information layer information comprises variable information. The variable information of the digital information layer and the variable information of the first printing layer have a corresponding relationship. Easy tear lines are arranged on both sides of the digital information layer. The variable information of the digital information layer can be seen by tearing the label along the easy tear lines. The large label has low preparation cost and high yield.

Description

Technical Field

[0001] This invention belongs to the field of anti-counterfeiting label technology, specifically relating to a large label with particle feature recognition and its preparation method. Background Technology

[0002] With the advancement of technology, anti-counterfeiting methods are becoming increasingly sophisticated and diverse. To prevent their products from being counterfeited, most manufacturers employ anti-counterfeiting labels to protect their goods.

[0003] Texture anti-counterfeiting technology is an anti-counterfeiting technology that uses the inherent texture features of the material itself as anti-counterfeiting identification marks. An important feature of using texture distribution feature patterns for anti-counterfeiting identification marks is that each one is different. The basic principle is: a texture distribution feature pattern is randomly generated and stored in a cloud database for later review. When identifying, the texture distribution feature pattern in the cloud database is retrieved for comparison. If it does not match, it is fake.

[0004] The principle of textured anti-counterfeiting technology has been publicly available for many years. Currently, most related products on the market are textured paper products, which involve adding colored fibers to pulp to create a visible texture, which is then printed as an anti-counterfeiting label. However, because the texture particles that form the texture are very small, these anti-counterfeiting labels have problems such as indistinct texture, poor tactile feel, and easy printing for counterfeiting. On the other hand, anti-counterfeiting labels with obvious texture and good tactile feel are difficult to process. For large labels on bottles such as oil drums and cosmetics, the physical characteristics of the entire sheet affect the aesthetics of the label, and the large amount of random physical characteristic particles used leads to high material consumption and increased costs. In addition, the processing efficiency is low, with low efficiency in coating, printing, and information collection, resulting in a low yield.

[0005] Chinese patent CN 202010217263.3 discloses a large label for random physical feature identification and its preparation method. The label includes, from top to bottom, a first printing layer, a first plastic film layer, a first adhesive layer, a random physical feature layer, a second printing layer, a second plastic film layer, a color ink layer, and a second adhesive layer. The random physical feature layer is formed by coating the second printing layer. The following problems exist during the coating process:

[0006] 1) Because the particles have a certain thickness, when the amount of glue combined with random physical features is relatively small, scratches are easily caused on the printing layer and the second plastic film layer during the coating process, affecting the surface effect of the label and, in severe cases, interfering with the readability of the printed information. When the amount of glue combined with random physical features is relatively large, although the coating is smoother and scratches are less likely to occur, glue overflow is easily caused when subjected to pressure or die-cutting, resulting in label back-adhesion during the production and processing process.

[0007] 2) When coating granules, the granules are mixed with the adhesive. Due to the difference in density between the granules and the adhesive, they tend to sink or float during the coating process, often resulting in uneven coating, granules without physical characteristics, or scratches caused by excessive granules. Currently, this problem is mostly solved by manual stirring. While manual stirring has some effect when applied directly, the problem reappears after a period of time, and it does not fundamentally solve the problem. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides a large label with magic particle feature recognition. It is made by embedding small identifiers into a large label, ensuring unique anti-counterfeiting information. This makes it difficult to counterfeit and allows for rapid identification. Authenticity can be verified at any time during the product circulation process. After purchase, peeling off the label reveals hidden variable information, allowing users to check product traceability, anti-counterfeiting information, points, and prize redemption information. Once peeled off, the label is damaged and cannot be restored, effectively preventing reuse. The magic particle is located between two layers of film, making it difficult to fall off.

[0009] This invention also provides a preparation method that has low processing cost, high efficiency, and high yield, and solves the problem of scratches or glue overflow that occurs when directly coating the anti-counterfeiting features of the magic particle.

[0010] The large label with particle feature recognition described in this invention includes, from top to bottom, a first plastic film layer, a first adhesive layer, a random identification mark layer, a second printing layer, a substrate layer, a digital information layer, and a third adhesive layer.

[0011] The random identification layer partially covers the second printing layer;

[0012] The random identification layer includes, from top to bottom, a first printing layer, a second plastic film layer, a random physical feature layer, a third plastic film layer, an ink layer, and a second adhesive layer. The information in the first printing layer includes variable information. The random physical feature layer is composed of random physical features and adhesive. There is a correspondence between the variable information and the random physical features. The correspondence can be a local correspondence or a global correspondence, depending on the customer's needs.

[0013] The digital information layer information includes variable information, and there is a correspondence between the variable information of the digital information layer and the variable information of the first printing layer;

[0014] Easy-tear lines are provided on both sides of the digital information layer. Peeling off the label along the easy-tear lines will reveal the variable information of the digital information layer.

[0015] in:

[0016] The aforementioned "magic particles" are random physical feature particles. These random physical features are at least one of the following: particles, strips, rings, or fibers that are identifiable to the naked eye. Preferably, the random physical features are at least one of the following: particles, strips, rings, or fibers that are identifiable to the naked eye and have a metallic texture, possessing both obvious external characteristics and the ability to be separated from the markings. The thickness of the random physical feature layer is 1-20 μm.

[0017] The first, second, and third plastic film layers are PET, PE, PP, or PVC films. The thickness of the first plastic film layer is 10-30 μm, and the thicknesses of the second and third plastic film layers are 10-80 μm, respectively. Preferably, the first plastic film layer is a PP or PE film, which has an excellent feel, making the product softer and more comfortable, with good adhesion, and preventing label lifting or wrinkling. Furthermore, when the label is transferred by heating, heat shrinkage occurs, preventing label deformation and effectiveness.

[0018] A solid color layer is disposed below the first printing layer. Preferably, the solid color layer is a white ink layer or a silver ink layer. Positioning variable information above the solid color layer effectively avoids interference from random physical features below, thus ensuring readability.

[0019] A partial release layer is provided below the third plastic film layer. This prevents the random identification label layer from being completely removed from the label and pasted onto other labels, which could lead to a situation where the label appears genuine before purchase but is found to be counterfeit upon verification after purchase.

[0020] A clear varnish layer is disposed beneath the digital information layer. The clear varnish layer serves to release and protect the digital information layer, ensuring that the digital information layer can be peeled off along the tear line while maintaining the integrity of the digital information.

[0021] A silicone paper layer is provided below the third adhesive layer.

[0022] The method for preparing the large label for particle feature recognition according to the present invention includes the following steps:

[0023] 1) Preparation of the random identification layer:

[0024] ① Randomly mixed physical characteristic particles are added to the adhesive, diluted with solvent, and then coated using a laminating machine to bond the second and third plastic film layers together; wherein, an airflow stirring device is installed at the bottom of the coating tank (see attached schematic diagram). Figure 6 The airflow stirring device includes an air inlet pipe and a conduit pipe, the air inlet pipe and the conduit pipe are connected, and the conduit pipe is evenly distributed with air outlet holes.

[0025] ② Print graphic information on the second plastic film layer to form a first printing layer, wherein the graphic information includes variable information;

[0026] ③ Print the color ink layer below the third plastic film layer;

[0027] ④ Apply adhesive under the color ink layer to form a second adhesive layer;

[0028] ⑤ Collect variable information and random physical characteristics, correlate the variable information and local or all random physical characteristics through calculation, and upload them to the database for querying purposes;

[0029] 2) Printing is performed on the substrate layer to form a second printing layer;

[0030] 3) Use an automatic labeling machine to apply a random identification label layer to the second printing layer to form a random identification label layer;

[0031] 4) Apply adhesive over the random identification mark layer and bond it together with the first plastic film layer;

[0032] 5) Print a digital information layer below the substrate layer and associate the digital information layer with the variable information of the random identification mark layer;

[0033] 6) Apply adhesive to the silicone paper and bond it to the digital information layer;

[0034] 7) While die-cutting the label, also die-cut the tear line at the position corresponding to the digital information layer.

[0035] In step ①, the diameter of the air inlet pipe and the conduit is 6-8mm, the air pressure of the air inlet pipe is 0.2-0.5MPa, the spacing between the air outlet holes is 2-3cm, and the diameter of the air outlet holes is 0.01-0.08cm.

[0036] In step ①, the adhesive is CF-206, the solvent is ethyl acetate, and the mass ratio of the adhesive, solvent, and random physical characteristic particles is 100:80:2. Using a solvent for dilution ensures uniform distribution of the random physical characteristic particles during coating and reduces the solid content. This reduces the amount of adhesive while maintaining uniformity of the random physical characteristic particles, thus avoiding adhesive overflow.

[0037] In step ②, a solid color layer is printed below the variable information.

[0038] In step ③, after printing a partial release layer below the third plastic film layer, the color ink layer is then printed. In step ④, the adhesive is a high-temperature resistant adhesive, and a two-component pressure-sensitive adhesive with a curing agent is used to improve the adhesive's cohesive strength.

[0039] In step 4), the adhesive is a UV pressure-sensitive adhesive. The lamination process involves bonding the first plastic film layer with other parts using UV pressure-sensitive adhesive. Other parts are coated with UV pressure-sensitive adhesive and then bonded to the first plastic film layer. After UV curing, the UV pressure-sensitive adhesive reacts, bonding the two parts together. The advantages are: because the random identification label layer has a multi-layered structure with obvious protrusions, using UV pressure-sensitive adhesive for first lamination followed by UV curing allows the adhesive to fully wet the two layers when not exposed to UV light, as the liquid is fluid. After UV irradiation, the adhesive becomes pressure-sensitive and loses its fluidity, ensuring no air bubbles at the protruding edges.

[0040] In step 6), the silicone paper layer is first peeled off on the printing press, the digital information layer area is coated with partial varnish, and then the silicone paper layers are laminated together.

[0041] When consumers verify the authenticity of a product:

[0042] 1. By scanning the variable information (i.e., the printed layer information) of the label, the distribution of random physical feature particles can be retrieved, and the authenticity of the anti-counterfeiting label can be identified by comparison. Alternatively, the software can first scan the variable information, and then collect the distribution of random physical feature particles; the system will then perform its own comparison to determine the authenticity of the label.

[0043] 2. After scanning the variable information to verify that it is genuine, peel it off along the tear line. The digital information layer can be used for traceability, anti-counterfeiting, prize redemption, points accumulation, and other functions.

[0044] 3. The random physical features of the random physical feature layer have a textured feel when touched and can be picked out.

[0045] 4. When attempting to maliciously remove the random identification label layer completely from the label, the color ink layer corresponding to the local release layer is left behind, resulting in incomplete peeling and damage to the random identification label. This prevents the random identification label layer from being reused and reduces the risk of counterfeiting.

[0046] 5. When the label is transferred as a whole, it is easy to separate and be damaged from the tear line, resulting in incomplete label and affecting secondary use.

[0047] Compared with the prior art, the beneficial effects of the present invention are:

[0048] 1. The label described in this invention enables verification of authenticity before purchase, solving the problem of not being able to distinguish between genuine and counterfeit products during circulation. Anyone can check the authenticity and decide whether to purchase after verifying that the product is genuine, thus reducing unnecessary losses.

[0049] 2. The label described in this invention is formed by associating random physical features with variable information that are difficult to reproduce by random physical feature layers. The label is unique and cannot be counterfeited.

[0050] 3. By scanning the variable information on the label, the distribution of random feature particles can be retrieved, and the authenticity of the anti-counterfeiting label can be identified by comparison. Alternatively, the software can first scan the variable information, then collect the distribution of random feature particles, and the system can perform an automatic comparison to determine the authenticity of the label. This creates an anti-counterfeiting label that is both difficult to counterfeit and can be quickly identified.

[0051] 4. The label is destroyed once peeled off, effectively preventing reuse and providing high anti-counterfeiting protection. The random physical features are tactilely raised and can be picked up. These features exist between two layers of film (second and third plastic films), avoiding the risk of them peeling off during processing.

[0052] 5. The preparation method of this invention involves embedding small labels into large labels. Random physical features are fabricated on the small labels, requiring less raw material, resulting in lower processing costs, higher efficiency, and a higher yield. Preparing small labels first and then embedding them into large labels is less efficient than fabricating random physical features, as this improves the yield and saves costs. In contrast, with monolithic large labels, any problems during the fabrication of random physical features can destroy the entire label, leading to unnecessary waste.

[0053] 6. When coating random physical feature particles, dilute the adhesive with a solvent and control the amount of random physical feature particles within a certain range. This will not only achieve uniform coating of particles, but also avoid the risk of adhesive overflow between the two layers of film.

[0054] 7. The preparation method of this invention is scientific, reasonable, simple and easy to implement. By installing an airflow stirring device at the bottom of the coating tank, uniform particle coating can be achieved, fundamentally solving the problem of uneven particle coating, saving manpower, and improving the quality and appearance of such products, while ensuring production efficiency. Attached Figure Description

[0055] Figure 1 This is a schematic diagram of the layer structure of the large label for particle feature recognition in this invention;

[0056] Figure 2 This is a schematic diagram of the layer structure of the random identification layer in Example 1;

[0057] Figure 3 This is a schematic diagram of the layer structure of the random identification layer in Example 2;

[0058] Figure 4 This is a schematic diagram of the apparent structure of the large label for particle feature recognition in this invention;

[0059] Figure 5 This is a schematic diagram of the surface structure of the large label for particle feature recognition of the present invention after it has been peeled off;

[0060] Figure 6 This is a schematic diagram of the airflow stirring device described in this invention;

[0061] In the diagram: 1. First plastic film layer; 2. First adhesive layer; 3. Random identification mark layer; 3.1. First printing layer; 3.2. Second plastic film layer; 3.3. Random physical feature layer; 3.4. Third plastic film layer; 3.5. Color ink layer; 3.6. Second adhesive layer; 3.7. Partial release layer; 3.8. Solid color layer; 4. Second printing layer; 5. Substrate layer; 6. Digital information layer; 7. Third adhesive layer; 8. Gloss varnish layer; 9. Silicone paper layer; 10. Easy-tear line. Detailed Implementation

[0062] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0063] Example 1

[0064] like Figure 1 and Figure 2 As shown, the large label with particle feature recognition includes, from top to bottom, a first plastic film layer 1, a first adhesive layer 2, a random identification mark layer 3, a second printing layer 4, a substrate layer 5, a digital information layer 6, and a third adhesive layer 7.

[0065] The random identification layer 3 partially covers the second printing layer 4; the random identification layer 3 includes, from top to bottom, a first printing layer 3.1, a second plastic film layer 3.2, a random physical feature layer 3.3, a third plastic film layer 3.4, an ink layer 3.5, and a second adhesive layer 3.6. The information in the first printing layer 3.1 includes variable information, and the random physical feature layer 3.3 is composed of random physical features and adhesive. There is a correspondence between the variable information and the random physical features.

[0066] The digital information layer 6 includes variable information (QR code), and there is a correspondence between the variable information (QR code) of the digital information layer 6 and the variable information (QR code) of the first printing layer 3.1.

[0067] Easy-tear lines 10 are provided on both sides of the digital information layer 6. By peeling off the label along the easy-tear lines 10, the variable information of the digital information layer 6 can be seen.

[0068] The aforementioned "magic particles" are random physical feature particles. These random physical features are particles with a metallic texture that are visible to the naked eye. The thickness of the random physical feature layer 3.3 is 10 μm.

[0069] The first plastic film layer 1 is a PP film with a thickness of 20μm.

[0070] The second plastic film layer 3.2 is a PET film with a thickness of 50μm.

[0071] The third plastic film layer 3.4 is a PVC film with a thickness of 60μm.

[0072] A silicone paper layer 9 is provided below the third adhesive layer 7.

[0073] Its preparation method consists of the following steps:

[0074] 1) Preparation of random identification layer 3:

[0075] ① Random physical characteristic particles are mixed into the adhesive, diluted with solvent, and then coated using a laminating machine to laminate the second plastic film layer 3.2 and the third plastic film layer 3.4 together; wherein, an airflow stirring device is provided at the bottom of the coating tank, the airflow stirring device includes an air inlet pipe and a conduit pipe, the air inlet pipe is connected to the conduit pipe, and the conduit pipe is evenly distributed with air outlet holes.

[0076] ② Print graphic information on the second plastic film layer 3.2 to form the first printing layer 3.1, wherein the graphic information includes variable information;

[0077] ③ Print the color ink layer 3.5 below the third plastic film layer 3.4;

[0078] ④ Apply adhesive below the color ink layer 3.5 to form a second adhesive layer 3.6;

[0079] ⑤ Collect variable information and random physical characteristics, correlate the variable information and local or all random physical characteristics through calculation, and upload them to the database for querying purposes;

[0080] 2) Printing is performed on the substrate layer 5 to form the second printing layer 4;

[0081] 3) Use an automatic labeling machine to apply the random identification label layer 3 to the second printing layer 4 to form the random identification label layer 3;

[0082] 4) Apply adhesive over the random identification mark layer 3 and bond it together with the first plastic film layer 1;

[0083] 5) Print a digital information layer 6 below the substrate layer 5, and associate the digital information layer 6 with the variable information of the random identification mark layer 3;

[0084] 6) Apply adhesive to the silicone paper and bond it to the six sides of the digital information layer;

[0085] 7) While die-cutting the label, the easy-tear line 10 is die-cut at the position corresponding to the digital information layer 6.

[0086] In step ①, the diameter of the air inlet pipe and the conduit is 6 mm, the air pressure of the air inlet pipe is 0.3 MPa, the spacing between the air outlet holes is 3 cm, and the diameter of the air outlet holes is 0.03 cm. The adhesive is CF-206, the solvent is ethyl acetate, and the mass ratio of the adhesive, solvent, and random physical characteristic particles is 100:80:2. Using a solvent for dilution ensures uniform distribution of the random physical characteristic particles during coating and reduces the solid content. This reduces the amount of adhesive while maintaining uniformity of the random physical characteristic particles, thus avoiding adhesive overflow.

[0087] In step ④, the adhesive is a high-temperature resistant adhesive, and a two-component pressure-sensitive adhesive is used with the addition of a curing agent to improve the cohesive strength of the adhesive.

[0088] In step 4), the adhesive is a UV pressure-sensitive adhesive. The lamination process involves bonding the first plastic film layer 1 to other parts using UV pressure-sensitive adhesive. Other parts are coated with UV pressure-sensitive adhesive and then bonded to the first plastic film layer 1. After UV curing, the UV pressure-sensitive adhesive reacts, bonding the two parts together. The advantages are: because the random identification label layer 3 has a multi-layered structure with obvious protrusions, using UV pressure-sensitive adhesive for first lamination followed by UV curing allows the adhesive to fully wet the two layers when not exposed to UV light, as the liquid is fluid. After UV irradiation, the adhesive becomes pressure-sensitive and loses its fluidity, ensuring no air bubbles at the protruding edges.

[0089] When consumers verify the authenticity of a product:

[0090] 1. By scanning the variable information (i.e., the printed layer information) of the label, the distribution of random physical feature particles can be retrieved, and the authenticity of the anti-counterfeiting label can be identified by comparison. Alternatively, the software can first scan the variable information, and then collect the distribution of random physical feature particles; the system will then perform its own comparison to determine the authenticity of the label.

[0091] 2. After scanning the variable information to verify authenticity, peel off the tear line 10 (before peeling off, if...). Figure 4 After uncovering, as Figure 5 Through the digital information layer 6, functions such as traceability, anti-counterfeiting, prize redemption, and points accumulation can be achieved.

[0092] 3. Random physical features layer 3.3: The random physical features have a textured feel when touched and can be picked out.

[0093] 4. When the label is transferred as a whole, it is easy to separate and be damaged from the tear line 10, resulting in incomplete label and affecting secondary use.

[0094] Example 2

[0095] like Figure 1 and Figure 3As shown, the structure of the large label for identifying particle features is the same as in Embodiment 1, except that a solid color layer 3.8 is provided below the first printing layer 3.1. The solid color layer 3.8 is a white ink layer 3.5. During printing, multi-color printing is used, and an additional solid color layer 3.8 is printed below the first printing layer 3.1. The printing of the solid color layer 3.8 and the first printing layer 3.1 can be completed in one step.

[0096] A partial release layer 3.7 is provided below the third plastic film layer 3.4.

[0097] A varnish layer 8 is disposed below the digital information layer 6.

[0098] The preparation method is the same as in Example 1, except that:

[0099] In step ②, a solid color layer 3.8 is printed below the variable information.

[0100] In step ③, after printing a partial release layer 3.7 below the third plastic film layer 3.4, the color ink layer 3.5 is then printed.

[0101] In step 6), the silicone paper layer 9 is first peeled off on the printing press, the digital information layer 6 area is coated with partial varnish, and then the silicone paper layer 9 is laminated together.

[0102] When consumers verify the authenticity of a product:

[0103] 1. By scanning the variable information (i.e., the printed layer information) of the label, the distribution of random physical feature particles can be retrieved, and the authenticity of the anti-counterfeiting label can be identified by comparison. Alternatively, the software can first scan the variable information, and then collect the distribution of random physical feature particles; the system will then perform its own comparison to determine the authenticity of the label.

[0104] 2. After scanning the variable information to verify authenticity, peel off the tear line 10 (before peeling off, if...). Figure 4 After uncovering, as Figure 5 Through the digital information layer 6, functions such as traceability, anti-counterfeiting, prize redemption, and points accumulation can be achieved.

[0105] 3. Random physical features layer 3.3: The random physical features have a textured feel when touched and can be picked out.

[0106] 4. When attempting to maliciously remove the random identification label layer 3 completely from the label, the color ink layer 3.5 corresponding to the local release layer 3.7 is left behind, resulting in incomplete removal and damage to the random identification label. This prevents the random identification label layer 3 from being reused and reduces the risk of counterfeiting.

[0107] 5. When the label is transferred as a whole, it is easy to separate and be damaged from the tear line 10, resulting in incomplete label and affecting secondary use.

[0108] Of course, the above content is only a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for preparing a large label with particle feature recognition, characterized in that: The aforementioned magic particle feature identification large label includes, from top to bottom, a first plastic film layer (1), a first adhesive layer (2), a random identification mark layer (3), a second printing layer (4), a substrate layer (5), a digital information layer (6), and a third adhesive layer (7). The random identification mark layer (3) partially covers the second printing layer (4); The random identification layer (3) includes, from top to bottom, a first printing layer (3.1), a second plastic film layer (3.2), a random physical feature layer (3.3), a third plastic film layer (3.4), a color ink layer (3.5), and a second adhesive layer (3.6). The information in the first printing layer (3.1) includes variable information. The random physical feature layer (3.3) is composed of random physical features and adhesive. There is a correspondence between the variable information and the random physical features. A partial release layer (3.7) is provided below the third plastic film layer (3.4); The digital information layer (6) includes variable information, and the variable information of the digital information layer (6) corresponds to the variable information of the first printing layer (3.1). Easy-tear lines (10) are provided on both sides of the digital information layer (6). By peeling off the label along the easy-tear lines (10), the variable information of the digital information layer (6) can be seen. The method for preparing the large label for particle feature recognition includes the following steps: 1) Preparation of the random identification layer (3): ① Random physical characteristic particles are mixed into the adhesive, diluted with solvent, and then coated with a laminating machine to laminate the second plastic film layer (3.2) and the third plastic film layer (3.4) together. The bottom of the coating tank is equipped with an airflow stirring device, which includes an air inlet pipe and a conduit pipe. The air inlet pipe is connected to the conduit pipe, and the conduit pipe is evenly distributed with air outlet holes. ② Print graphic information on the second plastic film layer (3.2) to form a first printing layer (3.1), wherein the graphic information includes variable information; ③ Print the color ink layer (3.5) below the third plastic film layer (3.4); ④ Apply adhesive under the color ink layer (3.5) to form a second adhesive layer (3.6). ⑤ Collect variable information and random physical characteristics, correlate the variable information and local or all random physical characteristics through calculation, and upload them to the database for querying purposes; 2) Print on the substrate layer (5) to form a second printing layer (4); 3) Use an automatic labeling machine to apply a random identification label layer (3) to the second printing layer (4) to form a random identification label layer (3); 4) Apply adhesive over the random identification mark layer (3) and bond it together with the first plastic film layer (1); 5) Print a digital information layer (6) under the substrate layer (5) and associate the digital information layer (6) with the variable information of the random identification layer (3); 6) Apply adhesive to the silicone paper and bond it to the digital information layer (6); 7) While die-cutting the label, the easy-tear line (10) is die-cut at the position corresponding to the digital information layer (6); In step ①, the diameter of the air inlet pipe and the conduit is 6-8mm, the air pressure of the air inlet pipe is 0.2-0.5MPa, the hole spacing of the air outlet is 2-3cm, and the hole diameter of the air outlet is 0.01-0.08cm. In step ①, the adhesive is CF-206, the solvent is ethyl acetate, and the mass ratio of the adhesive, solvent, and random physical characteristic particles is 100:80:

2. In step 4), the adhesive is a UV pressure-sensitive adhesive. The lamination process involves bonding the first plastic film layer with other parts using UV pressure-sensitive adhesive. The other parts are coated with UV pressure-sensitive adhesive and then bonded together with the first plastic film layer. After UV curing, the UV pressure-sensitive adhesive reacts to bond the two parts together.

2. The method for preparing the large label for particle feature recognition according to claim 1, characterized in that: The random physical features are at least one of particles, strips, rings or fibers that can be identified by the naked eye; the thickness of the random physical feature layer (3.3) is 1-20 μm.

3. The method for preparing the large label for particle feature recognition according to claim 1, characterized in that: The first plastic film layer (1), the second plastic film layer (3.2) and the third plastic film layer (3.4) are PET, PE, PP or PVC films. The thickness of the first plastic film layer (1) is 10-30μm, and the thicknesses of the second plastic film layer (3.2) and the third plastic film layer (3.4) are 10-80μm respectively.

4. The method for preparing the large label for particle feature recognition according to claim 1, characterized in that: A solid color layer (3.8) is disposed below the first printing layer (3.1).

5. The method for preparing the large label for particle feature recognition according to claim 1, characterized in that: A varnish layer (8) is provided below the digital information layer (6).

6. The method for preparing the large label for particle feature recognition according to claim 1, characterized in that: A silicone paper layer (9) is provided below the third adhesive layer (7).

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