Silver-coated printing process for paperboard of cigarette case

Abstract

The invention discloses a paperboard silver-coated printing process for a cigarette case, and relates to the technical field of paperboard printing. The method comprises the following steps: S1, preparing a substrate; the method comprises the following steps: firstly, cutting the white cardboard to obtain a substrate; s2, laser engraving of a gravure plate, wherein the gravure plate is manufactured through the laser engraving technology, and the accuracy and definition of a printing plate face are ensured; s4, intaglio printing of silver ink: printing silver paste on the white cardboard, and forming a silver bottom effect through a six-color intaglio printing process; s5, intaglio printing of DNA anti-forgery ink: the DNA anti-forgery ink is overprinted on the white cardboard coated with the silver bottom again by adopting the intaglio printing technology, and the ink provides unique anti-forgery identity authentication for the cigarette case and has the characteristics of being easy to identify and difficult to imitate; and S7, gravure printing of UV gloss oil is conducted, specifically, the UV gloss oil is printed on the white cardboard through gravure printing so as to increase the glossiness and the protection effect of the surface, and the UV gloss oil can further improve the abrasion resistance and the weather resistance of the cigarette case.

Description

Technical Field

[0001] The invention relates to the technical field of cardboard printing, in particular to a cardboard silver-coated printing process for cigarette boxes. Background Art

[0002] The silver-coated printing process for cigarette box cardboard usually involves the use of special printing technology to achieve a silver or metallic decorative effect on the cardboard surface. This process can increase the aesthetics and class of the cigarette box, and also has a certain anti-counterfeiting function. According to the searched information, this process may involve UV transfer technology, in which a layer of UV oil is applied to the surface of the paper through a rubber cloth, and then the light column film or specific pattern is transferred to the printed paper through a roller, thereby producing a laser paper-like effect on the paper surface.

[0003] The existing printing process has the following problems: the materials used are difficult to degrade, causing serious environmental pollution; the existing printing process is complicated, resulting in increased energy consumption and affecting the work efficiency of personnel; in addition, the surface coating of conventional printing process is prone to fall off during long-term use, affecting the aesthetics of the product; and the coating has poor anti-counterfeiting effect and is easy to be imitated by personnel.

[0004] Therefore, the existing silver-coated printing process for cardboard used in cigarette boxes cannot meet the needs in actual use, so there is an urgent need for improved technology in the market to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a cardboard silver-coated printing process for cigarette boxes, which solves the problems raised in the above-mentioned background technology through the setting.

[0006] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0007] The present invention is a cardboard silver-coated printing process for cigarette boxes, comprising the following steps:

[0008] S1: substrate preparation: first, the white cardboard is cut to obtain a substrate;

[0009] S2: Laser engraving gravure plate: Use laser engraving technology to make gravure plates, ensuring the accuracy and clarity of the printed layout;

[0010] S3: Preparation of gravure silver ink: Preparation of silver ink suitable for gravure printing. The silver ink should have excellent leveling, strong adhesion and high gloss to meet the needs of large-area printing;

[0011] S4: Gravure printing silver ink: Print silver paste on white cardboard, and then use six-color gravure printing process to form a silver base effect;

[0012] S5: Gravure printing DNA anti-counterfeiting ink: On the white cardboard covered with silver base, the DNA anti-counterfeiting ink is overprinted again using gravure printing technology. This ink provides a unique anti-counterfeiting identity authentication for the cigarette box, which is easy to identify and difficult to copy;

[0013] S6: Gravure printing color ink: On the white cardboard covered with DNA anti-counterfeiting ink, continue to use gravure printing technology to overprint color ink (such as four-color ink) to form the required pattern and text;

[0014] S7: Gravure printing UV varnish: Use gravure printing to print UV varnish on white cardboard to increase the surface gloss and protection effect. UV varnish can also improve the wear resistance and weather resistance of the cigarette box.

[0015] Preferably, the step S2 specifically adopts laser engraving technology to make the gravure plate, controls the plate depth to be between 30 μm and 35 μm, controls the cell opening width of the gravure plate to be between 60 μm and 100 μm, and the dot density is 3 to 5, thereby ensuring the fineness of the pattern and the printing quality.

[0016] Preferably, the gravure printing silver ink in step S3 is composed of silver aluminum powder, a connecting material, a solvent and an auxiliary agent; specifically, it includes: hexanediol diacrylate and lignin-modified phenolic resin, and the viscosities are 3000-5000 and 10000-30000 respectively.

[0017] The titanium dioxide coated silver powder consists of 20-45% of 0.01-0.04 μm silver powder and 55-80% of 1-3 μm silver powder.

[0018] Silver powder is a mixture of 80% granular aluminum powder and 20% nano-silicon.

[0019] Preferably, the six-color gravure printing process in the S4 gravure printing silver ink specifically comprises the following steps:

[0020] S41: Pre-press preparation: including the preparation of design manuscripts, the production and inspection of printing plates, the mixing and testing of inks, etc. When designing, it is necessary to consider the matching of gold and silver with other colors and the printing order to ensure the best printing effect. When mixing silver ink, it is necessary to pay attention to the ratio and mixing uniformity of gold and silver powder and silver oil to ensure the stability of ink and printing effect;

[0021] S42: Plate loading: Install the prepared printing plate on the printing press and make necessary adjustments to ensure that the position between the printing plate and the substrate is accurate;

[0022] S43: Adjustment rules: According to printing requirements, adjust various parameters of the printing press, such as pressure, speed, ink volume, etc., to ensure the stability of the quality of printed products;

[0023] S44: Formal printing: After adjusting the printing machine, formal printing begins. In six-color gravure printing, printing must be carried out in the designed color sequence. After each color is printed, necessary inspections and adjustments must be made. When printing, the appropriate printing pressure and speed must be adjusted according to the material and thickness of the substrate to avoid adverse phenomena such as smearing and ink accumulation.

[0024] S45: Drying and post-processing: After printing, the printed product needs to be dried to ensure that the ink solidifies quickly and adheres to the substrate. At the same time, necessary post-processing steps such as cutting and laminating are also required to complete the final printed product production. The temperature and humidity in the printing workshop must be kept constant to avoid print quality problems caused by environmental changes.

[0025] Preferably, the gravure printing ink comprises 20-40 parts of soybean ink and 2-10 parts of ink additives by weight, the ink additives comprise 20-25 parts of adhesion promoter, 10-15 parts of surface sizing agent, 15-20 parts of desiccant, 5-10 parts of dryness regulator, 2-5 parts of gelling agent, 2-5 parts of leveling agent, 5-8 parts of dispersant and 5-8 parts of plasticizer by weight, and the adhesion promoter comprises Dyno l-604.

[0026] Preferably, the gravure printing UV varnish comprises a UV curing resin (main resin), a photoinitiator (photosensitizer), a pigment filler and a variety of additives, wherein;

[0027] UV curing resin (main resin) is composed of 45% unsaturated polyester, 30% epoxy resin and 25% polyurethane acrylate;

[0028] The photoinitiator (photosensitizer) is a 907 type free radical photoinitiator;

[0029] The pigment and filler are made of rutile titanium dioxide;

[0030] The additives specifically include a leveling agent, a defoamer, a wetting agent, a UV absorber, and a hindered amine light stabilizer (HALS) in a ratio of 3:3:2:1:1.

[0031] Preferably, the S5 gravure printing DNA anti-counterfeiting ink specifically comprises:

[0032] S51: Overprinting anti-counterfeiting ink: DNA anti-counterfeiting ink is overprinted on the silver base using gravure printing technology, which increases the anti-counterfeiting ability of the cigarette box and makes each cigarette box have a unique identity authentication, greatly improving the safety level of the product;

[0033] S52: Overprinting color ink and varnish: Overprinting color ink and UV varnish onto the processed white cardboard through gravure printing to complete the printing of the entire cigarette box. The application of UV varnish not only protects the printed images, but also improves the surface gloss and wear resistance.

[0034] The present invention has the following beneficial effects:

[0035] The gravure printing silver ink provided by the present invention is composed of silver aluminum powder, a connecting material, a solvent and an auxiliary agent; specifically comprising: hexanediol diacrylate and lignin modified phenolic resin, the viscosities of which are 3000-5000 and 10000-30000 respectively, so as to enhance the adhesion and wear resistance of the silver ink and provide transparency and glossiness; the gravure printing color ink comprises, by weight, 20-40 parts of soybean ink and 2-10 parts of ink auxiliary agents, the ink auxiliary agents comprising, by weight, 20-25 parts of adhesion promoter, 10-15 parts of surface sizing agent, 15-20 parts of desiccant, 5-10 parts of dryness regulator, 2-5 parts of gelling agent, 2-5 parts of leveling agent, 5-8 parts of dispersant and 5-8 parts of plasticizer, the adhesion promoter comprising Dyno l-604; gravure printing UV varnish includes UV curing resin (main resin), photoinitiator (photosensitizer), pigments and fillers and various additives, wherein; UV curing resin (main resin) is composed of 45% unsaturated polyester, 30% epoxy resin and 25% polyurethane acrylate; the photoinitiator (photosensitizer) is a 907 type free radical photoinitiator; the pigments and fillers are rutile titanium dioxide; the additives are specifically a leveling agent, a defoamer, a wetting agent, a UV absorber, a hindered amine light stabilizer (H ALS); gravure printing DNA anti-counterfeiting ink specifically includes: S51: overprinting anti-counterfeiting ink: overprinting DNA anti-counterfeiting ink on the silver base with gravure printing technology, which increases the anti-counterfeiting ability of the cigarette box and makes each cigarette box have a unique identity authentication, greatly improving the safety level of the product; S52: overprinting color ink varnish: overprinting color ink and UV varnish on the processed white cardboard through gravure printing to complete the printing of the entire cigarette box. The application of UV varnish not only protects the printed graphics, but also improves the surface gloss and wear resistance.

[0036] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0038] Figure 1 The present invention is a process flow chart of silver-coated printing of cardboard for cigarette boxes;

[0039] Figure 2 This is a process flow chart of the six-color gravure printing process of the present invention. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0041] Example 1

[0042] See also Figure 1-2 As shown, this embodiment is a cardboard silver-coated printing process for cigarette boxes, comprising the following steps:

[0043] S1: substrate preparation: first, the white cardboard is cut to obtain a substrate;

[0044] S2: Laser engraving gravure plate: Use laser engraving technology to make gravure plates, ensuring the accuracy and clarity of the printed layout;

[0045] S3: Preparation of gravure silver ink: Preparation of silver ink suitable for gravure printing. The silver ink should have excellent leveling, strong adhesion and high gloss to meet the needs of large-area printing;

[0046] S4: Gravure printing silver ink: Print silver paste on white cardboard, and then use six-color gravure printing process to form a silver base effect;

[0047] S5: Gravure printing DNA anti-counterfeiting ink: On the white cardboard covered with silver base, the DNA anti-counterfeiting ink is overprinted again using gravure printing technology. This ink provides a unique anti-counterfeiting identity authentication for the cigarette box, which is easy to identify and difficult to copy;

[0048] S6: Gravure printing color ink: On the white cardboard covered with DNA anti-counterfeiting ink, continue to use gravure printing technology to overprint color ink (such as four-color ink) to form the required pattern and text;

[0049] S7: Gravure printing UV varnish: Use gravure printing to print UV varnish on white cardboard to increase the surface gloss and protection effect. UV varnish can also improve the wear resistance and weather resistance of the cigarette box.

[0050] Furthermore, the step S2 specifically adopts laser engraving technology to make the gravure plate, controls the plate depth to be between 30 μm and 35 μm, controls the cell opening width of the gravure plate to be between 60 μm and 100 μm, and the dot density is 3 to 5, thereby ensuring the fineness of the pattern and the printing quality.

[0051] Furthermore, the gravure printing silver ink in step S3 is composed of silver aluminum powder, a connecting material, a solvent and an auxiliary agent; specifically, it includes: hexanediol diacrylate and lignin-modified phenolic resin, and the viscosities are 3000-5000 and 10000-30000 respectively.

[0052] The titanium dioxide coated silver powder consists of 20-45% of 0.01-0.04 μm silver powder and 55-80% of 1-3 μm silver powder.

[0053] Silver powder is a mixture of 80% granular aluminum powder and 20% nano-silicon.

[0054] Furthermore, the six-color gravure printing process in the S4 gravure printing silver ink specifically includes the following steps:

[0055] S41: Pre-press preparation: including the preparation of design manuscripts, the production and inspection of printing plates, the mixing and testing of inks, etc. When designing, it is necessary to consider the matching of gold and silver with other colors and the printing order to ensure the best printing effect. When mixing silver ink, it is necessary to pay attention to the ratio and mixing uniformity of gold and silver powder and silver oil to ensure the stability of ink and printing effect;

[0056] S42: Plate loading: Install the prepared printing plate on the printing press and make necessary adjustments to ensure that the position between the printing plate and the substrate is accurate;

[0057] S43: Adjustment rules: According to printing requirements, adjust various parameters of the printing press, such as pressure, speed, ink volume, etc., to ensure the stability of the quality of printed products;

[0058] S44: Formal printing: After adjusting the printing machine, formal printing begins. In six-color gravure printing, printing must be carried out in the designed color sequence. After each color is printed, necessary inspections and adjustments must be made. When printing, the appropriate printing pressure and speed must be adjusted according to the material and thickness of the substrate to avoid adverse phenomena such as smearing and ink accumulation.

[0059] S45: Drying and post-processing: After printing, the printed product needs to be dried to ensure that the ink solidifies quickly and adheres to the substrate. At the same time, necessary post-processing steps such as cutting and laminating are also required to complete the final printed product production. The temperature and humidity in the printing workshop must be kept constant to avoid print quality problems caused by environmental changes.

[0060] Furthermore, the gravure printing ink comprises 20-40 parts of soybean ink and 2-10 parts of ink additives by weight, the ink additives comprise 20-25 parts of adhesion promoter, 10-15 parts of surface sizing agent, 15-20 parts of desiccant, 5-10 parts of dryness regulator, 2-5 parts of gelling agent, 2-5 parts of leveling agent, 5-8 parts of dispersant and 5-8 parts of plasticizer by weight, and the adhesion promoter comprises Dyno l-604.

[0061] Furthermore, the gravure printing UV varnish includes UV curing resin (main resin), photoinitiator (photosensitizer), pigment filler and various additives, wherein;

[0062] UV curing resin (main resin) is composed of 45% unsaturated polyester, 30% epoxy resin and 25% polyurethane acrylate;

[0063] The photoinitiator (photosensitizer) is a 907 type free radical photoinitiator;

[0064] The pigment and filler are made of rutile titanium dioxide;

[0065] The additives specifically include a leveling agent, a defoamer, a wetting agent, a UV absorber, and a hindered amine light stabilizer (HALS) in a ratio of 3:3:2:1:1.

[0066] Furthermore, the S5 gravure printing DNA anti-counterfeiting ink specifically includes:

[0067] S51: Overprinting anti-counterfeiting ink: DNA anti-counterfeiting ink is overprinted on the silver base using gravure printing technology, which increases the anti-counterfeiting ability of the cigarette box and makes each cigarette box have a unique identity authentication, greatly improving the safety level of the product;

[0068] S52: Overprinting color ink and varnish: Overprinting color ink and UV varnish onto the processed white cardboard through gravure printing to complete the printing of the entire cigarette box. The application of UV varnish not only protects the printed images, but also improves the surface gloss and wear resistance.

[0069] Working principle:

[0070] Experimental Example 1: The materials include 20 parts of soybean ink and 4 parts of ink additives, 20 parts of adhesion promoter, 10 parts of surface sizing agent, 15 parts of desiccant, 5 parts of dryness regulator, 2 parts of gelling agent, 2 parts of leveling agent, 5 parts of dispersant and 5 parts of plasticizer, and 22 parts of adhesion promoter Dyno l-604;

[0071] The preparation method is as follows: the resin and the solvent are mixed and stirred evenly to form a resin solution, then the pigment and the additive are gradually added to the resin solution, and the stirring is continued to ensure that the components are fully mixed, and the pigment particles in the ink are ground to the nanometer level using a high-speed grinder or a sand mill and other equipment to improve the fineness and dispersibility of the ink. The grinding time and temperature need to be controlled during the grinding process to avoid excessive refinement or agglomeration of the pigment particles. According to the performance requirements of the ink, the viscosity, fluidity and other parameters are adjusted, and an appropriate amount of additives or solvents need to be added to achieve the expected performance indicators. The ink is filtered to remove impurities and particles to ensure the purity and stability of the ink. The thickness of the polyurethane methacrylate coating liquid is 15-30 μm, and the coating amount of the polyurethane methacrylate coating liquid is 1.5-2.5 g / m2. In the printing of S6, the printing environment temperature of the printing machine is 25-30°C, and the printing environment humidity of the printing machine is 57-63%. The printed pattern is dried by hot air drying, and the hot air blowing time is 45-60s, the temperature is 75-85°C, and the wind speed is 20-25m / s.

[0072] The environmentally friendly ink prepared in the above experimental example had a little pigment falling off after being printed on paper, and the drying time was 1.5 minutes.

[0073] Experimental Example 2: The materials include 30 parts of soybean ink and 6 parts of ink additives, 23 parts of adhesion promoter, 13 parts of surface sizing agent, 18 parts of desiccant, 8 parts of dryness regulator, 3 parts of gelling agent, 3 parts of leveling agent, 6 parts of dispersant and 7 parts of plasticizer, and 22 parts of adhesion promoter Dyno l-604;

[0074] The preparation method is as follows: the resin and the solvent are mixed and stirred evenly to form a resin solution, then the pigment and the additive are gradually added to the resin solution, and the stirring is continued to ensure that the components are fully mixed, and the pigment particles in the ink are ground to the nanometer level using a high-speed grinder or a sand mill and other equipment to improve the fineness and dispersibility of the ink. The grinding time and temperature need to be controlled during the grinding process to avoid excessive refinement or agglomeration of the pigment particles. According to the performance requirements of the ink, the viscosity, fluidity and other parameters are adjusted, and an appropriate amount of additives or solvents need to be added to achieve the expected performance indicators. The ground ink is filtered to remove impurities and particles to ensure the purity and stability of the ink. The thickness of the polyurethane methacrylate coating liquid is 15-30μm, and the coating amount of the polyurethane methacrylate coating liquid is 1.5-2.5g / m2. In the printing of S6, the printing environment temperature of the printing machine is 25-30℃, the printing environment humidity of the printing machine is 57-63%, and the printed pattern is dried by hot air drying. The hot air blowing time is 45-60s, the temperature is 75-85℃, and the wind speed is 20-25m / s

[0075] The surface of the environmentally friendly ink prepared in the above experimental example is smooth and flat after being printed on paper, and the drying time is 0.8 min.

[0076] Thus, it can be seen from the above experimental examples 1-2 that the environmentally friendly ink prepared in experimental example 2 has the best quality and is also the best for the printing effect and efficiency of paper when applied to this process.

[0077] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0078] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0079] Finally, it should be noted that the above description 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 replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cardboard silver-coated printing process for cigarette boxes, characterized in that; The steps include: S1: Substrate preparation: First, white cardboard is cut to obtain a substrate; S2: Laser engraving gravure plate: Use laser engraving technology to make gravure plates, ensuring the accuracy and clarity of the printed surface; S3: Preparation of gravure silver ink: Preparation of silver ink suitable for gravure printing. The silver ink should have excellent leveling, strong adhesion and high gloss to meet the needs of large-area printing; S4: Gravure printing silver ink: Print silver paste on white cardboard, and then use six-color gravure printing process to form a silver base effect; S5: Gravure printing DNA anti-counterfeiting ink: On the white cardboard covered with silver base, the DNA anti-counterfeiting ink is overprinted again using gravure printing technology. This ink provides a unique anti-counterfeiting identity authentication for the cigarette box, which is easy to identify and difficult to copy; S6: Gravure printing color ink: On the white cardboard covered with DNA anti-counterfeiting ink, continue to use gravure printing technology to overprint color ink (such as four-color ink) to form the required pattern and text; S7: Gravure printing UV varnish: Use gravure printing to print UV varnish on white cardboard to increase the surface gloss and protection effect. UV varnish can also improve the wear resistance and weather resistance of the cigarette box.

2. The silver-coated printing process for cardboard used for cigarette boxes according to claim 1, characterized in that: The step S2 specifically adopts laser engraving technology to make the gravure plate, controls the plate depth to be between 30 μm and 35 μm, controls the cell opening width of the gravure plate to be between 60 μm and 100 μm, and the dot density to be 3 to 5, thereby ensuring the fineness of the pattern and the printing quality.

3. The silver-coated printing process for cardboard used for cigarette boxes according to claim 1, characterized in that: The gravure printing silver ink in step S3 is composed of silver aluminum powder, a connecting material, a solvent and an auxiliary agent; specifically, it includes: hexanediol diacrylate and lignin-modified phenolic resin, and the viscosities are 3000-5000 and 10000-30000 respectively. The titanium dioxide coated silver powder consists of 20-45% of 0.01-0.04 μm silver powder and 55-80% of 1-3 μm silver powder. Silver powder is a mixture of 80% granular aluminum powder and 20% nano-silicon.

4. The silver-coated printing process for cardboard used for cigarette boxes according to claim 1, characterized in that: The six-color gravure printing process in the S4 gravure printing silver ink specifically comprises the following steps: S41: Pre-press preparation: including the preparation of design manuscripts, the production and inspection of printing plates, the mixing and testing of inks, etc. When designing, it is necessary to consider the matching of gold and silver with other colors and the printing order to ensure the best printing effect. When mixing silver ink, it is necessary to pay attention to the ratio and mixing uniformity of gold and silver powder and silver oil to ensure the stability of ink and printing effect; S42: Plate loading: Install the prepared printing plate on the printing press and make necessary adjustments to ensure that the position between the printing plate and the substrate is accurate; S43: Adjustment rules: According to printing requirements, adjust various parameters of the printing press, such as pressure, speed, ink volume, etc., to ensure the stability of the quality of printed products; S44: Formal printing: After adjusting the printing machine, formal printing begins. In six-color gravure printing, printing must be carried out in the designed color sequence. After each color is printed, necessary inspections and adjustments must be made. When printing, the appropriate printing pressure and speed must be adjusted according to the material and thickness of the substrate to avoid adverse phenomena such as smearing and ink accumulation. S45: Drying and post-processing: After printing, the printed product needs to be dried to ensure that the ink solidifies quickly and adheres to the substrate. At the same time, necessary post-processing steps such as cutting and laminating are also required to complete the final printed product production. The temperature and humidity in the printing workshop must be kept constant to avoid print quality problems caused by environmental changes.

5. The silver-coated printing process for cardboard used for cigarette boxes according to claim 1, characterized in that: The gravure printing ink comprises 20-40 parts of soybean ink and 2-10 parts of ink additives by weight, and the ink additives comprise 20-25 parts of adhesion promoter, 10-15 parts of surface sizing agent, 15-20 parts of desiccant, 5-10 parts of dryness regulator, 2-5 parts of gelling agent, 2-5 parts of leveling agent, 5-8 parts of dispersant and 5-8 parts of plasticizer by weight, and the adhesion promoter comprises Dynol-604.

6. The silver-coated printing process for cardboard used for cigarette boxes according to claim 1, characterized in that: The gravure printing UV varnish comprises a UV curing resin (main resin), a photoinitiator (photosensitizer), a pigment filler and a variety of additives, wherein; UV curing resin (main resin) is composed of 45% unsaturated polyester, 30% epoxy resin and 25% polyurethane acrylate; The photoinitiator (photosensitizer) is a 907 type free radical photoinitiator; The pigment and filler are made of rutile titanium dioxide; The additives specifically include a leveling agent, a defoamer, a wetting agent, a UV absorber, and a hindered amine light stabilizer (HALS) in a ratio of 3:3:2:1:

1.

7. The silver-coated printing process for cardboard used for cigarette boxes according to claim 1, characterized in that: The S5 gravure printing DNA anti-counterfeiting ink specifically includes: S51: Overprinting anti-counterfeiting ink: DNA anti-counterfeiting ink is overprinted on the silver base using gravure printing technology, which increases the anti-counterfeiting ability of the cigarette box and makes each cigarette box have a unique identity authentication, greatly improving the safety level of the product; S52: Overprinting color ink and varnish: Overprinting color ink and UV varnish onto the processed white cardboard through gravure printing to complete the printing of the entire cigarette box. The application of UV varnish not only protects the printed images, but also improves the surface gloss and wear resistance.

Images