Shrink film laser anti-counterfeiting coating for cigarette packet as well as preparation method and application of shrink film laser anti-counterfeiting coating

Abstract

The invention belongs to the technical field of packaging coatings. The shrink film laser anti-counterfeiting coating for the cigarette packet comprises the following components in percentage by weight: 15%-40% of a polyester acrylate prepolymer, 10%-30% of a polyurethane acrylate prepolymer, 35%-55% of an active monomer, 4%-8% of a photoinitiator and 0.5%-1.5% of an auxiliary agent. The shrink film laser anti-counterfeiting coating for the cigarette packet provided by the invention meets the requirement index of an offset plate extrusion inking process, is applied to offset plate extrusion inking transfer printing equipment, and has a good transfer printing effect, an obtained anti-counterfeiting information layer is complete, and bubbles or pinholes do not appear on the surface; after the shrink film laser anti-counterfeiting coating for the cigarette packet is subjected to one-time curing, an obtained coating has good adhesive force on a BOPP film and has excellent wear resistance, folding resistance, weather resistance and water mist resistance. The invention further provides a preparation method and application of the shrink film laser anti-counterfeiting coating for the cigarette packet.

Description

Technical Field

[0001] The invention belongs to the technical field of coatings for packaging, and specifically relates to a shrink film laser anti-counterfeiting coating for cigarette packages, and a preparation method and application thereof. Background Art

[0002] Shrink film laser anti-counterfeiting coating is a special coating, usually applied to the shrink film of commodity packaging. Through specific processes and technical means, the shrink film surface presents a unique laser effect, thereby achieving the purpose of anti-counterfeiting. With the continuous development of the tobacco industry, the requirements for the printing quality, anti-counterfeiting performance and production efficiency of cigarette packaging are increasing. In order to meet these requirements, printing companies usually need customized printing equipment, among which offset extrusion inking transfer equipment is an important part of improving the printing quality and anti-counterfeiting performance of cigarette packages. The offset extrusion inking transfer equipment consumes less ink, which can save more ink; the faster machine speed is conducive to improving production efficiency, but it also puts higher requirements on the shrink film laser anti-counterfeiting coating.

[0003] Since the offset extrusion inking transfer equipment consumes less ink and has a faster machine speed, the traditional shrink film laser anti-counterfeiting coating cannot adapt well to the offset extrusion inking transfer equipment. If it is directly applied to the offset extrusion inking transfer equipment, it is easy to have problems such as insufficient inking, uneven or smeared plate, missing anti-counterfeiting information, and poor transfer effect. Therefore, it is necessary to develop a shrink film laser anti-counterfeiting coating for cigarette packages suitable for the new offset extrusion inking transfer process. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a shrink film laser anti-counterfeiting coating for cigarette packages, which can be suitable for offset plate extrusion inking process, has good transfer effect, and the obtained anti-counterfeiting information layer is complete, and no bubbles or pinholes appear on the surface; after the shrink film laser anti-counterfeiting coating for cigarette packages of the present invention is cured once, the obtained coating has good adhesion on the BOPP film, and has excellent wear resistance, folding resistance, weather resistance and water fog resistance.

[0005] The technical solution adopted by the present invention to solve the above problems is as follows:

[0006] A shrink film laser anti-counterfeiting coating for cigarette packages comprises the following components in percentage by weight: 15% to 40% polyester acrylate prepolymer, 10% to 30% polyurethane acrylate prepolymer, 35% to 55% active monomer, 4% to 8% photoinitiator, and 0.5% to 1.5% auxiliary agent.

[0007] Furthermore, the polyester acrylic prepolymer is at least one of difunctional polyester acrylate and trifunctional polyester acrylate; the polyurethane acrylate prepolymer is at least one of difunctional polyurethane acrylate and trifunctional polyurethane acrylate.

[0008] Furthermore, the active monomer is at least one of dipropylene glycol diacrylate, isobornyl acrylate, trimethylolpropane triacrylate, tripropylene glycol diacrylate, tetrahydrofurfuryl methacrylate, tetrahydrofurfuryl acrylate, hexadecene glycol diacrylate, 3-methyl-1,5-pentanediol diacrylate, and 6 mol caprolactone-modified dipentaerythritol hexaacrylate.

[0009] Furthermore, the tetrahydrofurfuryl methacrylate is Changxing EM314, the tetrahydrofurfuryl acrylate is Changxing EM214, the hexadecene glycol diacrylate is Changxing EM2205, and the 6-mol caprolactone-modified dipentaerythritol hexaacrylate is Changxing EM2696.

[0010] Furthermore, the active monomer is a mixture of Changxing EM314, Changxing EM214, Changxing EM2205 and Changxing EM2696.

[0011] Furthermore, the photoinitiator is at least one of TPO, TPO-L, 4-phenylbenzophenone, and methyl o-benzoylbenzoate.

[0012] Furthermore, the auxiliary agent is at least one of a leveling agent, a defoaming agent, and a dispersant.

[0013] Furthermore, the preparation method of the shrink film laser anti-counterfeiting coating for cigarette packages includes: adding polyester acrylate prepolymer, polyurethane acrylate prepolymer, active monomer, photoinitiator, and additives into a high-speed disperser according to the formula, stirring at a speed of 500r / min to 1500r / min for 30min to 90min, and after stirring evenly, obtaining the shrink film laser anti-counterfeiting coating for cigarette packages.

[0014] An application of the shrink film laser anti-counterfeiting coating for cigarette packages as described in any one of claims 1 to 9 on cigarette packages.

[0015] Specifically, the application is to produce a BOPP cigarette packaging film with anti-counterfeiting information through an offset extrusion inking process.

[0016] Furthermore, the offset extrusion inking process uses an offset extrusion inking transfer device.

[0017] Furthermore, the ink consumption of the offset extrusion inking transfer device is 1 to 3 g / m 2 ; The speed of the offset extrusion inking transfer equipment is 80 to 120 m / min.

[0018] Furthermore, the offset extrusion inking process includes: coating the laser anti-counterfeiting coating for the cigarette package on the BOPP film through a mesh roller and a rubber roller; molding the OPP laser film or nickel plate with anti-counterfeiting information and the BOPP film coated with the laser anti-counterfeiting coating for the cigarette package, and then performing ultraviolet light curing, and after peeling off the OPP laser film or nickel plate, a BOPP cigarette package film with anti-counterfeiting information is obtained.

[0019] Furthermore, the rubber roller is a positive relief rubber roller.

[0020] Furthermore, the coating is rotary coating.

[0021] Furthermore, the ultraviolet light curing is curing under ultraviolet light of 105nm to 405nm.

[0022] The present invention has the following beneficial effects:

[0023] The shrink film laser anti-counterfeiting coating for cigarette packages of the present invention has a wide curing power, good curing speed and high curing degree. The coating obtained after single curing has good adhesion on the BOPP film, which can ensure that the anti-counterfeiting information is completely and clearly transferred, and is suitable for application on BOPP cigarette package film; at the same time, the coating has excellent wear resistance, folding resistance, weather resistance and water fog resistance.

[0024] Compared with existing printing equipment, the offset extrusion inking transfer equipment consumes less ink and has a faster machine speed; the viscosity and curing speed of the shrink film laser anti-counterfeiting coating for cigarette packages of the present invention are suitable, which meet the requirements of the offset extrusion inking process, and are applied to the offset extrusion inking transfer equipment. The inking speed is fast and the inking thickness is uniform, the printing quality is high, the printing continuity can be guaranteed, and the production efficiency is improved; when the anti-counterfeiting information is transferred from the OPP laser film or the nickel plate to the BOPP cigarette package film by offset extrusion inking, the anti-counterfeiting information will not be missing, the transfer effect is good, the obtained anti-counterfeiting information layer is complete, and no bubbles or pinholes appear on the surface. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments, and are not limitations of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Unless otherwise specified, the test materials, reagents, methods and equipment used in the following examples are conventional test materials, reagents, methods and equipment in the technical field; unless otherwise specified, the test materials and reagents used in the following examples can be obtained from commercial sources. The quantitative tests in the following examples were all repeated three times, and the data are the average or average ± standard deviation of the three repeated experiments.

[0027] The following tetrahydrofurfuryl methacrylate is selected from Changxing EM314 from Taiwan, China;

[0028] The following tetrahydrofurfuryl acrylate is selected from Changxing EM214 from Taiwan, China;

[0029] The following 1,2-dioxanediol diacrylate is made from Changxing EM2205 from Taiwan, China;

[0030] The following 3-methyl-1,5-pentanediol diacrylate uses Changxing EM2295 from Taiwan, China;

[0031] The following 6-mol caprolactone-modified dipentaerythritol hexaacrylate is EM2696 from Changxing, Taiwan, China.

[0032] In some embodiments, the auxiliary agent is at least one of a leveling agent, a defoamer, and a dispersant. For example, the auxiliary agent is at least one of a polyether-modified polydimethylsiloxane copolymer, a polyether-modified polysiloxane, an acrylic polymer, a foam-breaking polymer, and a polysiloxane solution. It is worth noting that the present invention is not limited thereto, and those skilled in the art can selectively add auxiliary agents with known functions conventionally used in this field as needed.

[0033] Table 1 shows the specific usage of each component of the shrink film laser anti-counterfeiting coating for cigarette packages in Examples 1-5 of the present invention, in units of weight percentage.

[0034] Table 1:

[0035]

[0036] Table 2 shows the specific usage of each component of the laser anti-counterfeiting coatings of Comparative Examples 1-4 of the present invention, in units of weight percentage.

[0037] Table 2:

[0038]

[0039] The preparation method of the shrink film laser anti-counterfeiting coating for cigarette packages of Example 1-5 includes: adding polyester acrylate prepolymer, polyurethane acrylate prepolymer, active monomer, photoinitiator, and auxiliary agent into a high-speed disperser according to the formula, stirring at a speed of 1000r / min for 60min, and stirring evenly to obtain the shrink film laser anti-counterfeiting coating for cigarette packages. The preparation method of the laser anti-counterfeiting coating for Comparative Example 1-4 can be obtained in the same way.

[0040] The laser anti-counterfeiting coatings prepared in the embodiment and the comparative example are respectively coated on the BOPP film through a screen roller and a rubber roller using an offset extrusion inking transfer device; a nickel plate with anti-counterfeiting information is molded with the BOPP film coated with the laser anti-counterfeiting coating, and then cured for 1 second under 405nm ultraviolet light. After peeling off the nickel plate, a BOPP cigarette packaging film with an anti-counterfeiting information layer is obtained.

[0041] The anti-counterfeiting information layer on the printed products of the embodiments and comparative examples was tested as follows:

[0042] 1. Appearance: Visually observe the surface of the anti-counterfeiting information layer;

[0043] 2. Adhesion: Use 3M tape to pull back at a uniform speed;

[0044] 3. Wear resistance: Use a friction tester to perform reciprocating friction;

[0045] 4. Folding resistance: Fold the printed cigarette package repeatedly at 180 degrees;

[0046] 5. Waterproof fog resistance: Cover the printed matter of cigarette package with OPP cigarette film, and press the surface of handmade cigarette package iron at 120℃ for 3 seconds without water fog;

[0047] 6. Heat resistance: Tested at 100°C.

[0048] The above performance test results are shown in Table 3 and Table 4.

[0049] Table 3:

[0050]

[0051] Table 4:

[0052]

[0053]

[0054] It can be seen from Tables 3 and 4 above that the laser anti-counterfeiting coating of the shrink film for cigarette packages prepared in the embodiment of the present invention meets the requirement indicators of the offset extrusion inking process, and is applied to the offset extrusion inking transfer equipment, with good transfer effect, and the obtained anti-counterfeiting information layer is complete, without bubbles or pinholes on the surface; compared with the laser anti-counterfeiting coating of the comparative example, the laser anti-counterfeiting coating of the shrink film for cigarette packages in the embodiment has better wear resistance, folding resistance and weather resistance on the BOPP film after one-time curing.

[0055] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0056] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0057] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A shrink film laser anti-counterfeiting coating for cigarette packages, characterized in that: The invention comprises the following components in percentage by weight: 15% to 40% of polyester acrylate prepolymer, 10% to 30% of polyurethane acrylate prepolymer, 35% to 55% of active monomer, 4% to 8% of photoinitiator and 0.5% to 1.5% of auxiliary agent.

2. The shrink film laser anti-counterfeiting coating for cigarette packages according to claim 1, characterized in that: The polyester acrylic prepolymer is at least one of difunctional polyester acrylate and trifunctional polyester acrylate; the polyurethane acrylate prepolymer is at least one of difunctional polyurethane acrylate and trifunctional polyurethane acrylate.

3. The shrink film laser anti-counterfeiting coating for cigarette packages according to claim 1, characterized in that: The active monomer is at least one of dipropylene glycol diacrylate, isobornyl acrylate, trimethylolpropane triacrylate, tripropylene glycol diacrylate, tetrahydrofurfuryl methacrylate, tetrahydrofurfuryl acrylate, 1,2-dioxanediol diacrylate, 3-methyl-1,5-pentanediol diacrylate, and 6-mole caprolactone-modified dipentaerythritol hexaacrylate.

4. The shrink film laser anti-counterfeiting coating for cigarette packages according to claim 3, characterized in that: The tetrahydrofurfuryl methacrylate is Changxing EM314, the tetrahydrofurfuryl acrylate is Changxing EM214, the hexadecene glycol diacrylate is Changxing EM2205, and the 6-mole caprolactone-modified dipentaerythritol hexaacrylate is Changxing EM2696.

5. The shrink film laser anti-counterfeiting coating for cigarette packages according to claim 4, characterized in that: The active monomer is a mixture of Changxing EM314, Changxing EM214, Changxing EM2205 and Changxing EM2696.

6. The shrink film laser anti-counterfeiting coating for cigarette packages according to claim 1, characterized in that: The photoinitiator is at least one of TPO, TPO-L, 4-phenylbenzophenone and methyl o-benzoylbenzoate.

7. The shrink film laser anti-counterfeiting coating for cigarette packages according to claim 1, characterized in that: The auxiliary agent is at least one of a leveling agent, a defoaming agent and a dispersant.

8. The shrink film laser anti-counterfeiting coating for cigarette packages according to claim 1, characterized in that: The preparation method of the shrink film laser anti-counterfeiting coating for cigarette packages comprises: adding polyester acrylate prepolymer, polyurethane acrylate prepolymer, active monomer, photoinitiator and auxiliary agent into a high-speed disperser according to the formula, stirring at a speed of 500r / min to 1500r / min for 30min to 90min, and obtaining the shrink film laser anti-counterfeiting coating for cigarette packages after stirring evenly.

9. Use of the shrink film laser anti-counterfeiting coating for cigarette packages as claimed in any one of claims 1 to 8 on cigarette packages.

10. The application of the shrink film laser anti-counterfeiting coating for cigarette packages according to claim 9 on cigarette packages, characterized in that: The application is to produce a BOPP cigarette packaging film with anti-counterfeiting information through an offset extrusion inking process.

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