A positioning embossed anti-counterfeiting direct-coating label paper and its preparation method

Abstract

This invention discloses a positioning embossed anti-counterfeiting direct-coated label paper and its preparation method. The preparation method includes: fabricating a positioning embossed plate; coating a PET pre-coated film with a UV coating, bonding it to the positioning embossed plate, and then UV molding and curing to obtain a PET master film; bonding the surface heat-sealing layer of OPP material to the embossed pattern surface of the PET master film to obtain an OPP composite master film; coating the non-embossed pattern surface of the OPP composite master film with adhesive and bonding it to a PET film to obtain a PET / OPP double-layer composite film; coating a base paper with adhesive and bonding it to the PET / OPP double-layer composite film to obtain a label paper with positioning embossing; and performing aluminum plating and surface treatment on the surface of the label paper with positioning embossing to obtain a positioning embossed anti-counterfeiting direct-coated label paper. The preparation method of this invention allows for the reuse of the master film, broadening the application fields of the product.

Description

Technical Field

[0001] This invention relates to the field of label transfer technology, and in particular to a positioning embossed anti-counterfeiting direct-coated label paper and its preparation method. Background Technology

[0002] Embossing technology, a popular technology today, is highly favored by customers in the packaging industry. Its high-gloss, three-dimensional visual effect, combined with specialized embossed graphics and anti-counterfeiting features, greatly enhances the grade and competitiveness of packaging. As the technology matures, many label printing companies are gradually introducing embossing technology to strengthen the market competitiveness and differentiate their products. The embossed pattern on positioning embossed label paper needs to be precisely registered with the printed pattern. The OPP film used in the direct-coating process deforms significantly during multiple lamination processes, leading to large positioning deviations and failing to meet the requirements of positioning paper products. Therefore, positioning embossed label paper still uses the traditional PET transfer process for production: PET coating → PET molding → metallization → lamination → peeling → rehydration. This process cannot achieve multiple reuses of the PET film, resulting in relatively high costs and limiting its application. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method for preparing a positioning embossed anti-counterfeiting direct-coated label paper, which can realize the reuse of the mother film and the positioning deviation of the mother film after multiple uses is small.

[0004] To achieve the above-mentioned technical effects, the present invention provides a method for preparing a positioning embossed anti-counterfeiting direct-coating label paper, comprising the following steps:

[0005] (1) Create a positioning relief plate;

[0006] (2) Apply UV coating to the PET pre-coated film, bond it with the positioning relief plate, and then perform UV molding and curing. After peeling, a PET mother film is obtained.

[0007] (3) The surface heat-sealing layer of the OPP material is bonded to the embossed pattern surface of the PET mother film, and then rolled up separately to obtain the OPP composite mother film;

[0008] (4) Apply adhesive to the non-embossed patterned side of the OPP composite master film and laminate it with PET film to obtain a PET / OPP double-layer composite film.

[0009] (5) Apply glue to the base paper and laminate it with the PET / OPP double-layer composite film. The embossed pattern is transferred to the base paper to obtain a label paper with positioning embossing. After lamination, the label paper with positioning embossing and the PET / OPP double-layer composite film are rolled up separately. The rolled-up PET / OPP double-layer composite film is laminated with a new base paper again to transfer the positioning embossing.

[0010] (6) Apply aluminum plating to the surface of the label paper with positioning embossing;

[0011] (7) The label paper with aluminum plating of special edition text is surface treated to obtain positioning embossed anti-counterfeiting direct plating label paper.

[0012] As an improvement to the above technical solution, the adhesive in step (5) is a water-based acrylic resin with a solid content of 40%-45%, a Zein No. 4 cup viscosity ≥20s, and a coating dry weight ≥3g / m³. 2 .

[0013] As an improvement to the above technical solution, the adhesive in step (4) is a two-component solvent-free polyurethane composite adhesive, and the coating dry weight of the adhesive is 1 g / m³. 2 -3g / m 2 .

[0014] As an improvement to the above technical solution, the molding speed of the UV molding in step (2) is 20m / min-60m / min, the molding pressure is 5kg-15kg, and the power of the UV lamp for curing is 7.5kW-20kW.

[0015] As an improvement to the above technical solution, the thickness of the OPP material in step (3) is ≥28μm, wherein the thickness of the surface heat-sealing layer is ≥3μm, the longitudinal elongation rate of the OPP material is ≤2.5%, and the transverse elongation rate is ≤1%.

[0016] As an improvement to the above technical solution, before the bonding step in step (3), the OPP material is preheated from the side away from the surface heat seal layer, and the preheating temperature is 140℃-150℃.

[0017] As an improvement to the above technical solution, step (6) special edition text aluminizing includes printing the shielding oil onto the surface of the label paper with positioning embossing using a template with anti-counterfeiting text, and then performing vacuum aluminizing. The thickness of the vacuum aluminizing is...

[0018] As an improvement to the above technical solution, the surface treatment in step (7) includes applying a top coat to the upper surface of the label paper with positioning embossing and a back coat to the back of the label paper with positioning embossing; the top coat has a solid content of 20%-30% and a coating dry weight of 0.8g / m². 2 -1.5g / m 2 Water-based acrylic resin; the back coating uses a back coating liquid with a solid content of 5%-15%.

[0019] As an improvement to the above technical solution, the method for making the positioning relief plate in step (1) includes relief graphic design, laser lithography, plate making and electroforming, wherein the resolution of the laser lithography machine is ≥2000dpi.

[0020] Accordingly, the present invention also provides a positioning embossed anti-counterfeiting direct-coated label paper prepared by the above-mentioned preparation method, comprising, from top to bottom, a top coating layer, an anti-counterfeiting aluminum coating layer, a positioning embossed information layer, a bottom coating layer, a base paper layer, and a back coating layer; the positioning embossed anti-counterfeiting direct-coated label paper has a moisture content of 3%-5.5% and a registration deviation of ≤0.3mm.

[0021] Implementing the embodiments of the present invention has the following beneficial effects:

[0022] The PET / OPP double-layer composite film prepared by this invention can be reused more than 10 times, breaking through the problem that the traditional PET transfer coating process of positioning transfer paper can only be used once, reducing the molding process and film investment, and lowering costs. In addition, the PET / OPP double-layer composite film also solves the problem of large deformation of OPP composite mother film during multiple lamination processes, ensuring that the deformation is controlled within 0.3mm, which meets the requirements of conventional positioning paper products. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the positioning embossed anti-counterfeiting direct-coating label paper provided in an embodiment of the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments.

[0025] This invention discloses a method for preparing a positioning embossed anti-counterfeiting direct-coating label paper, comprising the following steps:

[0026] (1) Making a positioning relief plate, specifically including the following steps: relief graphic design, laser lithography, plate making and electroforming, wherein the resolution of the laser lithography machine is ≥2000dpi.

[0027] The resulting workpiece has a strong 3D relief effect, a clean surface with very few defects, no color difference, uniform thickness, and clear tracking cursor, which can match the usage requirements of subsequent processes.

[0028] (2) Apply UV coating to the PET pre-coated film, bond it with the positioning relief plate, and then perform UV molding and curing. After peeling, a PET master film is obtained.

[0029] The base film is a PET pre-coated film with a thickness ≥20μm, preferably from the middle stage. The molding plate uses a reverse-printed pattern, and the molding process is UV molding. A UV coating is applied to the PET pre-coated film, which is then bonded to the positioning embossed plate. After curing, the PET pre-coated film is separated from the positioning embossed plate, and the PET pre-coated film is cured again to obtain the PET master film. The resulting PET master film has an embossed pattern reproduction rate ≥98% and no obvious defects such as defects, indentations, burrs, dirt spots, or wrinkles.

[0030] The UV molding speed is 20m / min-60m / min, the molding pressure is 5kg-15kg, and the power of the UV lamp used for curing is 7.5kW-20kW.

[0031] The embossed pattern of the positioning embossing plate is imprinted onto the PET film using UV molding. The curing process generates low heat, avoiding deformation and stretching of the PET film caused by high-temperature molding, thus meeting the requirements for subsequent OPP film positioning embossing anti-counterfeiting replication.

[0032] (3) The surface heat-sealing layer of the OPP material is bonded to the embossed pattern surface of the PET mother film, and then rolled up separately to obtain the OPP composite mother film.

[0033] The OPP material has a thickness ≥28μm, with the surface heat-sealing layer having a thickness ≥3μm, ensuring sufficient thickness for embossed patterns. The OPP material has a longitudinal shrinkage rate ≤2.5% and a transverse shrinkage rate ≤1%. By optimizing the OPP material, the resulting OPP composite master film exhibits minimal deformation during the transfer process.

[0034] Before the bonding step, the OPP material is preheated from the side away from the surface heat-sealing layer at a temperature of 140℃-150℃ before bonding. The resulting OPP composite master film should have a clear embossed pattern with a reproduction degree of ≥90%, and be free from obvious defects such as defects, indentations, burrs, dirt spots, and wrinkles.

[0035] The positioning embossed anti-counterfeiting feature is replicated using OPP film positioning embossing replication technology. This low-temperature operation results in a high degree of fidelity in the reproduction of the positioning embossed anti-counterfeiting feature on the obtained OPP composite master film. After obtaining the OPP composite master film, the PET master film and the OPP composite master film are wound up separately.

[0036] (4) Apply adhesive to the non-embossed pattern side of the OPP composite master film and laminate it with PET film to obtain a PET / OPP double-layer composite film.

[0037] To further improve the deformation of the OPP composite master film to meet the requirements of positioning printing, the OPP composite master film was laminated with a PET film to obtain a PET / OPP double-layer composite film. The adhesive used for lamination was a two-component solvent-free polyurethane adhesive, and the dry coating weight of the adhesive was 1 g / m³. 2 -3g / m 2 After 24 hours of curing, the composite strength is >5N / 15mm, ensuring a firm bond between the OPP composite master film and the PET film, preventing displacement and detachment. The PET / OPP double-layer composite film structure utilizes the low thermal expansion and contraction of PET, ensuring that the OPP embossed master film does not undergo significant deformation during repeated use, thus guaranteeing the stability of product positioning between batches.

[0038] (5) Apply glue to the base paper and laminate it with the PET / OPP double-layer composite film. Transfer the positioning embossing onto the base paper to obtain a label paper with positioning embossing.

[0039] The paper used is low-grammage, wet-strength base paper; the adhesive is a water-based acrylic resin with a solid content of 40%-45%, a Zein No. 4 cup viscosity ≥20s, and a coating dry weight ≥3g / m². 2 After the adhesive dries and forms a film, it becomes highly glossy and transparent. The registration deviation of the embossed graphics after lamination using standard film is ≤0.3mm.

[0040] After lamination, the label paper with embossed pattern and the PET / OPP double-layer composite film are rolled up separately. The rolled-up PET / OPP double-layer composite film is then laminated with new base paper. The PET / OPP double-layer composite film can be reused more than 10 times until the pattern reproduction of the PET / OPP double-layer composite film is ≤80%, at which point a new master film is used for lamination production.

[0041] (6) Apply aluminum plating to the surface of the label paper with positioning embossing.

[0042] Corona treatment increases the surface tension of the paper, allowing for a tighter bond between the paper and the aluminum layer. After corona treatment, a special anti-counterfeiting aluminum plating machine is used for metallization of the text, simulating the gravure printing principle. A template with special anti-counterfeiting text is used to print the shielding ink onto the paper. This printing device is mounted on the metallization machine, and then vacuum metallization is performed. The printed text and images with the shielding ink will not adhere to the aluminum layer, thus revealing the image effect. The aluminum layer thickness should not be too thick and should be controlled within a certain range. The visibility of the images and text under natural light can be controlled by adjusting the thickness of the aluminum layer. This anti-counterfeiting aluminum plating process can enhance the metallic luster and brightness of the product, and provide it with anti-counterfeiting protection.

[0043] (7) After the special edition text is aluminum-plated, the label paper undergoes surface treatment to obtain a positioning embossed anti-counterfeiting direct-plated label paper. For example... Figure 1 As shown, the positioning embossed anti-counterfeiting direct-coated label paper includes, from top to bottom, a top coating layer 1, an anti-counterfeiting aluminum coating layer 2, a positioning embossed information layer 3, a bottom coating layer 4, a base paper layer 5, and a back coating layer 6; the positioning embossed anti-counterfeiting direct-coated label paper has a moisture content of 3%-5.5% and a registration deviation of ≤0.3mm.

[0044] A coating machine is used to apply a topcoat to the aluminum surface to meet the requirements of paper printing. The topcoat varnish is made of water-based acrylic resin with a solid content of 20%-30% and a dry coating weight of 0.8 g / m². 2 -1.5g / m 2 The resulting paper is then subjected to back coating or steam rehydration treatment. The back coating uses a solid content of 5%-15% and a dry coating weight of 0.3 g / m². 2 -1.2g / m2 The back coating liquid is prepared by compounding water-based acrylic emulsion with PEG, alcohol, etc., to ensure that the moisture content and flatness of the paper meet the requirements for printing and labeling.

[0045] The present invention will be further illustrated below with specific embodiments.

[0046] Example 1

[0047] This embodiment provides a method for preparing positioning embossed anti-counterfeiting direct-coating label paper, including the following steps:

[0048] (1) Making a positioning relief plate, specifically including the following steps: relief graphic design, laser lithography, plate making and electroforming, wherein the resolution of the laser lithography machine is ≥2000dpi.

[0049] (2) Apply UV coating to the PET pre-coated film, bond it with the positioning relief plate, and then perform UV molding and curing. After peeling, a PET master film is obtained.

[0050] The thickness of the PET pre-coated film is 25μm, the molding speed of the UV molding is 20m / min, the molding pressure is 5kg, and the power of the UV lamp used for curing is 7.5kW.

[0051] (3) Preheat the OPP material from the side away from the surface heat-sealing layer at a temperature of 145°C. Then, bond the surface heat-sealing layer of the OPP material to the embossed pattern side of the PET mother film and roll them up separately to obtain the OPP composite mother film.

[0052] The OPP material has a thickness of 28 μm, of which the surface heat-sealing layer has a thickness of 3 μm. The longitudinal shrinkage rate of the OPP material is 2.5%, and the transverse shrinkage rate is 1%.

[0053] (4) Apply adhesive to the non-embossed patterned surface of the OPP composite master film and laminate it with a PET film to obtain a PET / OPP double-layer composite film. The adhesive is a two-component solvent-free polyurethane composite adhesive, and the dry coating weight of the adhesive is 1 g / m². 2 .

[0054] (5) Apply glue to the base paper and laminate it with the PET / OPP double-layer composite film. Transfer the positioning embossing to the base paper to obtain a label paper with positioning embossing. After lamination, separate and roll up the label paper with embossed pattern and the PET / OPP double-layer composite film. Then, laminate the rolled-up PET / OPP double-layer composite film with the new base paper again.

[0055] The paper used is low-grammage, wet-strength base paper; the adhesive is a water-based acrylic resin with a solid content of 40%, a Zein No. 4 cup viscosity of 20s, and a coating dry weight of 3g / m². 2 .

[0056] (6) Apply aluminum plating to the surface of the label paper with positioning embossing.

[0057] The shielding oil is printed onto paper using a template with special anti-counterfeiting text. This printing device is mounted on an aluminum plating machine, and then vacuum aluminum plating is performed. The thickness of the aluminum plating layer is...

[0058] (7) Apply a top and back coating to the aluminum-plated label paper with the special-edition text. The top coating varnish is made of water-based acrylic resin with a solid content of 20% and a dry coating weight of 0.8 g / m². 2 The back coating uses a compounded water-based acrylic emulsion with a solid content of 10% and a dry coating weight of 0.3 g / m². 2 This yields a positioning embossed anti-counterfeiting direct-coating label paper.

[0059] Example 2

[0060] This embodiment provides a method for preparing positioning embossed anti-counterfeiting direct-coating label paper, including the following steps:

[0061] (1) Making a positioning relief plate, specifically including the following steps: relief graphic design, laser lithography, plate making and electroforming, wherein the resolution of the laser lithography machine is ≥2000dpi.

[0062] (2) Apply UV coating to the PET pre-coated film, bond it with the positioning relief plate, and then perform UV molding and curing. After peeling, a PET master film is obtained.

[0063] The thickness of the PET pre-coated film is 25μm, the molding speed of the UV molding is 60m / min, the molding pressure is 15kg, and the power of the UV lamp used for curing is 20kW.

[0064] (3) Preheat the OPP material from the side away from the surface heat-sealing layer at a temperature of 150°C. Then, bond the surface heat-sealing layer of the OPP material to the embossed pattern side of the PET mother film and roll them up separately to obtain the OPP composite mother film.

[0065] The OPP material has a thickness of 30μm, of which the surface heat-sealing layer has a thickness of 5μm. The longitudinal shrinkage rate of the OPP material is 2%, and the transverse shrinkage rate is 1%.

[0066] (4) Apply adhesive to the non-embossed patterned surface of the OPP composite master film and laminate it with a PET film to obtain a PET / OPP double-layer composite film. The adhesive is a two-component solvent-free polyurethane composite adhesive, and the dry coating weight of the adhesive is 3 g / m². 2 .

[0067] (5) Apply glue to the base paper and laminate it with the PET / OPP double-layer composite film. Transfer the positioning embossing to the base paper to obtain a label paper with positioning embossing. After lamination, separate and roll up the label paper with embossed pattern and the PET / OPP double-layer composite film. Then, laminate the rolled-up PET / OPP double-layer composite film with the new base paper again.

[0068] The paper used is low-grammage, wet-strength base paper; the adhesive is a water-based acrylic resin with a solid content of 45%, a Zein No. 4 cup viscosity of 25s, and a coating dry weight of 5g / m². 2 .

[0069] (6) Apply aluminum plating to the surface of the label paper with positioning embossing.

[0070] The shielding oil is printed onto paper using a template with special anti-counterfeiting text. This printing device is mounted on an aluminum plating machine, and then vacuum aluminum plating is performed. The thickness of the aluminum plating layer is...

[0071] (7) Apply a top and back coating to the label paper after the special-edition text has been aluminized. The top coating varnish is made of water-based acrylic resin with a solid content of 30% and a dry coating weight of 1.5 g / m². 2 The back coating uses a compounded water-based acrylic emulsion with a solid content of 10% and a dry coating weight of 0.3 g / m². 2 This yields a positioning embossed anti-counterfeiting direct-coating label paper.

[0072] Example 3

[0073] This embodiment provides a method for preparing positioning embossed anti-counterfeiting direct-coating label paper, including the following steps:

[0074] (1) Making a positioning relief plate, specifically including the following steps: relief graphic design, laser lithography, plate making and electroforming, wherein the resolution of the laser lithography machine is ≥2000dpi.

[0075] (2) Apply UV coating to the PET pre-coated film, bond it with the positioning relief plate, and then perform UV molding and curing. After peeling, a PET master film is obtained.

[0076] The thickness of the PET pre-coated film is 25μm, the molding speed of the UV molding is 30m / min, the molding pressure is 12kg, and the power of the UV lamp used for curing is 10kW.

[0077] (3) Preheat the OPP material from the side away from the surface heat-sealing layer at a temperature of 145°C. Then, bond the surface heat-sealing layer of the OPP material to the embossed pattern side of the PET mother film and roll them up separately to obtain the OPP composite mother film.

[0078] The OPP material has a thickness of 30μm, of which the surface heat-sealing layer has a thickness of 4μm. The longitudinal shrinkage rate of the OPP material is 2.5%, and the transverse shrinkage rate is 1%.

[0079] (4) Apply adhesive to the non-embossed patterned side of the OPP composite master film and laminate it with a PET film to obtain a PET / OPP double-layer composite film. The adhesive is a two-component solvent-free polyurethane composite adhesive, and the dry coating weight of the adhesive is 1.5 g / m². 2 .

[0080] (5) Apply glue to the base paper and laminate it with the PET / OPP double-layer composite film. Transfer the positioning embossing to the base paper to obtain a label paper with positioning embossing. After lamination, separate and roll up the label paper with embossed pattern and the PET / OPP double-layer composite film. Then, laminate the rolled-up PET / OPP double-layer composite film with the new base paper again.

[0081] The paper used is low-grammage, wet-strength base paper; the adhesive is a water-based acrylic resin with a solid content of 42%, a Zein No. 4 cup viscosity of 20s, and a coating dry weight of 4g / m². 2 .

[0082] (6) Apply aluminum plating to the surface of the label paper with positioning embossing.

[0083] The shielding oil is printed onto paper using a template with special anti-counterfeiting text. This printing device is mounted on an aluminum plating machine, and then vacuum aluminum plating is performed. The thickness of the aluminum plating layer is...

[0084] (7) Apply a top coating and a back coating to the label paper after the special edition text has been aluminized. The top coating varnish is a water-based acrylic resin with a solid content of 25% and a dry coating weight of 1g / m². 2 The back coating uses a compounded water-based acrylic emulsion with a solid content of 10% and a dry coating weight of 0.3 g / m². 2 This yields a positioning embossed anti-counterfeiting direct-coating label paper.

[0085] Performance testing:

[0086] Positioning embossed anti-counterfeiting direct-coating label paper was prepared using the preparation methods of Examples 1-3. The paper was processed into 100mm×100mm samples and its performance was tested. The test results are shown in Table 1.

[0087] (1) Firmness: Use 3M tape to quickly pull off the sample surface at 45° and observe whether delamination occurs.

[0088] (2) Moisture content: Weigh the original weight m1 using a precision electronic balance, bake it in a rapid moisture analyzer for 80 seconds, and then weigh it again m2 after baking. The formula for calculating the moisture content is: (m1-m2) / m1×100%

[0089] (3) Flatness: Place the sample in a constant temperature and humidity chamber, control the temperature at 30℃ and the humidity at 40%, and after half an hour, measure the upturn and downturn of the label. Upturn is recorded as + and downturn is recorded as -.

[0090] (4) Positioning deviation: Measure the distance between the positioning point of the anti-counterfeiting relief and the corresponding positioning point of the original paper.

[0091] Table 1 Performance test results of positioning embossed anti-counterfeiting direct-coating label paper

[0092] Delamination Moisture content (%) Flatness (mm) Positioning deviation (mm) Example 1 no 4.2 -5 0.25 Example 2 no 3.8 -8 0.30 Example 3 no 4.4 -3 0.18

[0093] As shown in Table 1, the positioning embossed anti-counterfeiting direct-coated label paper prepared by the method of the present invention has a moisture content and flatness that can meet the requirements for printing and labeling of positioning embossed anti-counterfeiting direct-coated label paper. The registration deviation of the prepared positioning embossed anti-counterfeiting direct-coated label paper is small, and the paper has good anti-counterfeiting performance.

[0094] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for preparing a positioning embossed anti-counterfeiting direct-coating label paper, characterized in that, Includes the following steps: (1) Create a positioning relief plate; (2) Apply UV coating to the PET pre-coated film, bond it with the positioning relief plate, and then perform UV molding and curing. After peeling, a PET mother film is obtained. (3) The surface heat-sealing layer of the OPP material is bonded to the embossed pattern surface of the PET mother film, and then rolled up separately to obtain the OPP composite mother film; the longitudinal stretch rate of the OPP material is ≤2.5%, and the transverse stretch rate is ≤1%. (4) Apply adhesive to the non-embossed patterned side of the OPP composite master film and laminate it with PET film to obtain a PET / OPP double-layer composite film. The adhesive used for lamination is a two-component solvent-free polyurethane lamination adhesive, and the dry weight of the adhesive coating is 1 g / m². 2 -3g / m 2 The composite strength after aging for 24 hours is >5N / 15mm; (5) Apply glue to the base paper and laminate it with the PET / OPP double-layer composite film. The embossed pattern is transferred to the base paper to obtain a label paper with positioning embossing. After lamination, the label paper with positioning embossing and the PET / OPP double-layer composite film are rolled up separately. The rolled-up PET / OPP double-layer composite film is laminated with a new base paper again to transfer the positioning embossing. (6) Apply aluminum plating to the surface of the label paper with positioning embossing; (7) The label paper with aluminum plating of special edition text is surface treated to obtain positioning embossed anti-counterfeiting direct plating label paper.

2. The method for preparing the positioning embossed anti-counterfeiting direct-coating label paper as described in claim 1, characterized in that, Step (5) The adhesive used for lamination is a water-based acrylic resin with a solid content of 40%-45%, a Zein No. 4 cup viscosity ≥20s, and a coating dry weight ≥3g / m². 2 .

3. The method for preparing the positioning embossed anti-counterfeiting direct-coating label paper as described in claim 1, characterized in that, The molding speed of the UV molding in step (2) is 20m / min-60m / min, the molding pressure is 5kg-15kg, and the power of the UV lamp for curing is 7.5kW-20kW.

4. The method for preparing the positioning embossed anti-counterfeiting direct-coating label paper as described in claim 1, characterized in that, The thickness of the OPP material in step (3) is ≥28μm, wherein the thickness of the surface heat-sealing layer is ≥3μm.

5. The method for preparing the positioning embossed anti-counterfeiting direct-coating label paper as described in claim 1, characterized in that, Before the bonding step described in step (3), the OPP material is preheated from the side away from the surface heat seal layer, and the preheating temperature is 140℃-150℃.

6. The method for preparing the positioning embossed anti-counterfeiting direct-coating label paper as described in claim 1, characterized in that, Step (6) Special Edition Text Aluminizing involves printing the shielding oil onto the surface of a label paper with positioning embossing using a template containing anti-counterfeiting text, followed by vacuum aluminizing. The thickness of the vacuum aluminizing is...

7. The method for preparing the positioning embossed anti-counterfeiting direct-coating label paper as described in claim 1, characterized in that, The surface treatment in step (7) includes applying a top coat to the upper surface of the label paper with positioning embossing and a back coat to the back surface of the label paper with positioning embossing; the top coat has a solid content of 20%-30% and a coating dry weight of 0.8 g / m². 2 -1.5g / m 2 Water-based acrylic resin; the back coating uses a back coating liquid with a solid content of 5%-15%.

8. The method for preparing the positioning embossed anti-counterfeiting direct-coating label paper as described in claim 1, characterized in that, The method for making the positioning relief plate in step (1) includes relief graphic design, laser lithography, plate making and electroforming, wherein the resolution of the laser lithography machine is ≥2000dpi.

9. A positioning embossed anti-counterfeiting direct-coating label paper prepared by the preparation method according to any one of claims 1-8, characterized in that, It includes, from top to bottom, a top coating layer, an anti-counterfeiting aluminum plating layer, a positioning embossed information layer, a bottom coating layer, a base paper layer, and a back coating layer; the moisture content of the positioning embossed anti-counterfeiting direct-coated label paper is 3%-5.5%, and the registration deviation is ≤0.3mm.

Images