Anti-counterfeiting packaging film for cigarettes and preparation method of anti-counterfeiting packaging film

Abstract

The invention discloses an anti-counterfeiting cigarette packaging film and a preparation method thereof, and relates to the technical field of cigarette films, the anti-counterfeiting cigarette packaging film comprises a laser anti-counterfeiting cigarette film with a damp-proof effect, the laser anti-counterfeiting cigarette film comprises a base layer, a fluorescent anti-counterfeiting layer, a laser anti-counterfeiting layer, a nano damp-proof layer and a heat-sealing laminating layer.The heat-sealing performance of the cigarette film can be guaranteed, meanwhile, the excellent damp-proof effect and anti-counterfeiting performance are achieved, and the anti-counterfeiting cigarette packaging film is suitable for popularization and application. The film body has a better anti-counterfeiting effect through the arranged vacuum sprayed nano metal particles, so that the smoke film can show different anti-counterfeiting characteristics when observed by the fluorescent anti-counterfeiting layer and the laser anti-counterfeiting layer on the two sides of the smoke film under the special illumination condition, the counterfeiting difficulty is improved, the arranged nano moisture-proof layer has good moisture-proof performance, and the anti-counterfeiting effect of the smoke film is improved. The damp-proof and dry state of the cigarette is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of cigarette films, and in particular to an anti-counterfeit cigarette packaging film and a preparation method thereof. Background Art

[0002] The tobacco industry has used a variety of materials for cigarette packaging films, including cellophane, PVC coated film, PVDC coated film, BOPP cigarette film, etc. BOPP cigarette film has become the preferred material for cigarette packaging because of its good optical properties, wide heat sealing range, high heat sealing strength, strong water vapor barrier ability, uniform thickness, wide shrinkage control range, good stiffness and other incomparable characteristics of other materials.

[0003] The traditional cigarette film for packaging has a three-layer structure. In the humid areas in the south, the humidity is high and it cannot effectively block the penetration of water vapor, resulting in a shortened shelf life of cigarettes. It also has no anti-counterfeiting function and cannot meet the needs of cigarette companies as the end users of cigarette films for beautiful and anti-counterfeiting cigarette films. Therefore, we propose an anti-counterfeiting cigarette packaging film and its preparation method to solve this problem. Summary of the invention

[0004] In view of this, the needle of the present invention is missing, and its main purpose is to provide an anti-counterfeit cigarette packaging film and a preparation method thereof, which serves to solve the above-mentioned problems.

[0005] To achieve the above purpose, the present invention adopts the following technical scheme: the laser anti-counterfeiting cigarette film with moisture-proof effect includes a base layer, a fluorescent anti-counterfeiting layer, a laser anti-counterfeiting layer, a nano moisture-proof layer, and a heat-sealing laminating layer;

[0006] A laser anti-counterfeiting layer is arranged directly above the base layer, and the laser anti-counterfeiting layer can present a predetermined pattern under light irradiation. The base layer is prepared from raw materials with the following weight fractions of components, including: copolymerized polypropylene: 92-98wt%; anti-adhesion agent: 2-8wt%;

[0007] A nano moisture-proof layer is arranged directly above the laser anti-counterfeiting layer, and the nano moisture-proof layer is used to improve the moisture-proof performance of the cigarette film; the laser anti-counterfeiting layer and the nano moisture-proof layer are prepared by the following process steps, including: step 1, uniform coating; step 2, high-temperature molding; step 3, cooling; step 4, vacuum spraying; step 5, uniform shower coating;

[0008] A fluorescent anti-counterfeiting layer is arranged directly below the base layer, and the fluorescent anti-counterfeiting layer can emit obvious fluorescence under ultraviolet light. The fluorescent anti-counterfeiting layer is prepared from raw materials with the following weight fractions of components, including: homopolymer polypropylene: 90-95wt%; colorless fluorescent agent: 1-2wt%; other additives: 3-6wt%;

[0009] The outer sides of the fluorescent anti-counterfeiting layer and the nano moisture-proof layer are both provided with a heat-sealing bonding layer, and the heat-sealing bonding layer is used to improve the heat-sealing performance and bonding effect of the cigarette film. The heat-sealing bonding layer is prepared from raw materials with the following weight fractions of components, including: copolymer polypropylene: 88-95wt%; anti-adhesion agent: 2-8wt%; slip agent: 2-8wt%.

[0010] As a preferred solution, the base layer, the fluorescent anti-counterfeiting layer, and the heat-sealing laminating layer are melt-mixed separately after raw material proportioning, and then introduced into an extruder separately to form a multi-layer film through a multi-layer co-extrusion technology.

[0011] As a preferred solution, step 1: uniform coating: using a precision coating machine to evenly apply the special coating on the base film;

[0012] Step 2: High temperature molding: Use a pre-patterned molding plate to pressurize the special coating in a high temperature chamber;

[0013] Step 3: Cooling: Use the heat exchanger in the cooling chamber to cool the membrane as it passes through;

[0014] Step 4: Vacuum spraying: using a spraying device in a vacuum chamber to evenly spray nano-scale metal particles on the laser coating, wherein the nano-scale metal particles are one of aluminum, chromium, and nickel;

[0015] Step 5: Uniform spray coating: Use coating equipment to evenly spray the nano moisture-proof solvent on the film body after vacuum spraying, and then dry and cure it after spraying.

[0016] As a preferred embodiment, the anti-adhesion agent is a silicon dioxide anti-adhesion agent, and the lubricant is an erucic acid amide internal lubricant.

[0017] As a preferred solution, in step one and step two, the special coating is prepared from raw materials consisting of the following components in weight fractions, including: polyacrylate resin: 80-90wt%; titanium oxide powder: 1-3wt%; ethyl acetate: 3-8wt%; other additives: 5-10wt%.

[0018] As a preferred solution, in step three, the heat exchanger equipment can be used to transfer the membrane to the next process so that the membrane is indirectly in contact with the cooling medium to achieve the effect of heat exchange and cooling.

[0019] As a preferred solution, in step 4, the thickness of the vacuum coating is 15-20 um.

[0020] As a preferred solution, in step five, the nano moisture-proof solvent is formed into a film with a thickness of 0.2-0.5 um.

[0021] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical solution that it mainly has the following advantages:

[0022] The present invention can ensure the heat-sealing performance of the cigarette film while also having excellent moisture-proof and anti-counterfeiting properties. The vacuum-sprayed nano-metal particles can enable the film body to have a better anti-counterfeiting effect, so that under special lighting conditions, the fluorescent anti-counterfeiting layer and the laser anti-counterfeiting layer on both sides of the cigarette film can present different anti-counterfeiting features, thereby increasing the difficulty of counterfeiting. In addition, the nano-moisture-proof layer has good moisture-proof performance, thereby ensuring the moisture-proof and dry state of the cigarette.

[0023] In order to more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the film layer structure of an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and implementation examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0027] The present invention will be further described below with reference to the embodiments.

[0028] Example 1

[0029] The base layer is prepared from raw materials with the following weight fractions of components, including: copolymerized polypropylene: 92%; anti-adhesive agent: 8wt%;

[0030] The fluorescent anti-counterfeiting layer is prepared from raw materials with the following weight fractions of components, including: homopolymer polypropylene: 92wt%; colorless fluorescent agent: 2wt%; other additives: 6wt%;

[0031] The heat-sealing laminating layer is prepared from raw materials with the following weight fractions of components, including: copolymerized polypropylene: 90wt%; anti-adhesive agent: 4wt%; slip agent: 4wt%;

[0032] The components of the three-layer film structure according to the above weight fractions are added into a mixing container respectively for mixing, and then introduced into an extruder to form a multi-layer film by a multi-layer co-extrusion technology;

[0033] After the formed film is placed on the starting position of the precision coating machine, the coating die head can apply special coating on the surface of the film during the forward transportation of the film;

[0034] Step 1: Uniform coating: Use a precision coating machine to evenly apply the special coating on the base film. The special coating is prepared from raw materials with the following weight fractions of components, including: polyacrylate resin: 90wt%; titanium oxide powder: 2wt%; ethyl acetate: 3wt%; other additives: 5wt%;

[0035] Step 2: High temperature molding: Use a pre-patterned molding plate to pressurize the special coating in a high temperature chamber;

[0036] Step 3: Cooling: Use the heat exchanger in the cooling bin to cool the film as it passes through. The heat exchanger can be used to transfer the film to the next process, so that the film is in indirect contact with the cooling medium to achieve the effect of heat exchange and cooling.

[0037] Step 4: Vacuum spraying: Use spraying equipment in a vacuum chamber to evenly spray nano-scale metal particles on the laser coating. The nano-scale metal particles are one of aluminum, chromium, and nickel. The thickness of the vacuum coating is 15um.

[0038] Step 5: Uniform spray coating: Use coating equipment to evenly spray the nano moisture-proof solvent on the vacuum sprayed film, and then dry and cure it after spray coating. The thickness of the nano moisture-proof solvent on the film is 0.2um.

[0039] Example 2

[0040] The base layer is prepared from raw materials with the following weight fractions of components, including: copolymerized polypropylene: 95wt%; anti-adhesive agent: 5wt%;

[0041] The fluorescent anti-counterfeiting layer is prepared from raw materials with the following weight fractions of components, including: homopolymer polypropylene: 95wt%; colorless fluorescent agent: 2wt%; other additives: 3wt%;

[0042] The heat-sealing laminating layer is prepared from raw materials with the following weight fractions of components, including: copolymerized polypropylene: 95wt%; anti-adhesive agent: 2wt%; slip agent: 3wt%;

[0043] The components of the three-layer film structure according to the above weight fractions are added to a mixing container for mixing, and then introduced into an extruder to form a multi-layer film through a multi-layer co-extrusion technology; after the formed film is placed on the starting station of the precision coating machine, the coating die head can coat a special coating on the surface of the film during the forward transportation of the film;

[0044] Step 1: Uniform coating: Use a precision coating machine to evenly apply the special coating on the base film. The special coating is prepared from raw materials with the following weight fractions of components, including: polyacrylate resin: 88wt%; titanium oxide powder: 3wt%; ethyl acetate: 3wt%; other additives: 6wt%;

[0045] Step 2: High temperature molding: Use a pre-patterned molding plate to pressurize the special coating in a high temperature chamber;

[0046] Step 3: Cooling: Use the heat exchanger in the cooling bin to cool the film as it passes through. The heat exchanger can be used to transfer the film to the next process, so that the film is in indirect contact with the cooling medium to achieve the effect of heat exchange and cooling.

[0047] Step 4: Vacuum spraying: Use spraying equipment in a vacuum chamber to evenly spray nano-scale metal particles on the laser coating. The nano-scale metal particles are one of aluminum, chromium, and nickel. The thickness of the vacuum coating is 20um.

[0048] Step 5: Uniform spray coating: Use coating equipment to evenly spray the nano moisture-proof solvent on the film body after vacuum spraying, and then dry and cure it after spraying. The thickness of the nano moisture-proof solvent on the film body is 0.5um;

[0049] Comparative Example 1

[0050] The base layer is prepared from raw materials with the following weight fractions of components, including: copolymerized polypropylene: 92-98wt%; anti-adhesion agent: 2-8wt%;

[0051] The fluorescent anti-counterfeiting layer is prepared from raw materials with the following weight fractions of components, including: homopolymer polypropylene: 95wt%; colorless fluorescent agent: 0wt%; anti-adhesion agent: 5wt%;

[0052] The heat-sealing laminating layer is prepared from raw materials with the following weight fractions of components, including: copolymerized polypropylene: 95wt%; anti-adhesive agent: 2t%; slip agent: 3wt%;

[0053] The components of the three-layer film structure according to the above weight fractions are added to a mixing container for mixing, and then introduced into an extruder to form a multi-layer film through a multi-layer co-extrusion technology; after the formed film is placed on the starting station of the precision coating machine, the coating die head can coat a special coating on the surface of the film during the forward transportation of the film;

[0054] Step 1: Uniform coating: Use a precision coating machine to evenly apply the special coating on the base film. The special coating is prepared from raw materials with the following weight fractions of components, including: polyacrylate resin: 88wt%; titanium oxide powder: 3wt%; ethyl acetate: 3wt%; other additives: 6wt%;

[0055] Step 2: High temperature molding: Use a pre-patterned molding plate to pressurize the special coating in a high temperature chamber;

[0056] Step 3: Cooling: Use the heat exchanger in the cooling bin to cool the film as it passes through. The heat exchanger can be used to transfer the film to the next process, so that the film is in indirect contact with the cooling medium to achieve the effect of heat exchange and cooling.

[0057] Step 4: Uniform spray coating: Use coating equipment to evenly spray the nano moisture-proof solvent on the film body after vacuum spraying, and then dry and cure it after spraying. The thickness of the nano moisture-proof solvent on the film body is 0.5um;

[0058] Comparative Example 2

[0059] The base layer is prepared from raw materials with the following weight fractions of components, including: copolymerized polypropylene: 92wt%; anti-adhesive agent: 8wt%;

[0060] The fluorescent anti-counterfeiting layer is prepared from raw materials with the following weight fractions of components, including: homopolymer polypropylene: 95wt%; colorless fluorescent agent: 2wt%; other additives: 3wt%;

[0061] The heat-sealing laminating layer is prepared from raw materials with the following weight fractions of components, including: copolymerized polypropylene: 95wt%; anti-adhesive agent: 2wt%; slip agent: 3wt%;

[0062] The components of the three-layer film structure according to the above weight fractions are added to a mixing container for mixing, and then introduced into an extruder to form a multi-layer film through a multi-layer co-extrusion technology; after the formed film is placed on the starting station of the precision coating machine, the coating die head can coat a special coating on the surface of the film during the forward transportation of the film;

[0063] Step 1: Uniform coating: Use a precision coating machine to evenly apply the special coating on the base film. The special coating is prepared from raw materials with the following weight fractions of components, including: polyacrylate resin: 88wt%; titanium oxide powder: 3wt%; ethyl acetate: 3wt%; other additives: 6wt%;

[0064] Step 2: High temperature molding: Use a pre-patterned molding plate to pressurize the special coating in a high temperature chamber;

[0065] Step 3: Cooling: Use the heat exchanger in the cooling bin to cool the film as it passes through. The heat exchanger can be used to transfer the film to the next process, so that the film is in indirect contact with the cooling medium to achieve the effect of heat exchange and cooling.

[0066] Step 4: Vacuum spraying: Use spraying equipment in a vacuum chamber to evenly spray nano-scale metal particles on the laser coating. The nano-scale metal particles are one of aluminum, chromium, and nickel. The thickness of the vacuum coating is 20um.

[0067] Test its performance: take out the molded films of the same size and specifications and place them in an environment of (23°C, 50% RH) for 24 hours to test the moisture-proof performance and anti-counterfeiting effect;

[0068] At the same time, the WVTR (water vapor transmission rate) of the formed film was tested with reference to the international standard ISO 150106-7:2015;

[0069]

[0070] By comparison, it is concluded that in Example 1 and Example 2, while ensuring the heat-sealing performance of the cigarette film, it also has excellent moisture-proof effect and anti-counterfeiting performance. The vacuum-sprayed nano-metal particles can make the film body have a better anti-counterfeiting effect, so that under special lighting conditions, the fluorescent anti-counterfeiting layer and the laser anti-counterfeiting layer on both sides of the cigarette film can show different anti-counterfeiting features, thereby increasing the difficulty of counterfeiting. In addition, the nano moisture-proof layer has good moisture-proof performance, ensuring the moisture-proof and dry state of the cigarette.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An anti-counterfeiting cigarette packaging film, characterized in that: The laser anti-counterfeiting cigarette film with moisture-proof effect comprises a base layer, a fluorescent anti-counterfeiting layer, a laser anti-counterfeiting layer, a nano moisture-proof layer, and a heat-sealing laminating layer; A laser anti-counterfeiting layer is arranged directly above the base layer, and the laser anti-counterfeiting layer can present a predetermined pattern under light irradiation. The base layer is prepared from raw materials with the following weight fractions of components, including: copolymerized polypropylene: 92-98wt%; anti-adhesion agent: 2-8wt%; A nano moisture-proof layer is arranged directly above the laser anti-counterfeiting layer, and the nano moisture-proof layer is used to improve the moisture-proof performance of the cigarette film; the laser anti-counterfeiting layer and the nano moisture-proof layer are prepared by the following process steps, including: step 1, uniform coating; step 2, high-temperature molding; step 3, cooling; step 4, vacuum spraying; step 5, uniform shower coating; A fluorescent anti-counterfeiting layer is arranged directly below the base layer, and the fluorescent anti-counterfeiting layer can emit obvious fluorescence under ultraviolet light. The fluorescent anti-counterfeiting layer is prepared from raw materials with the following weight fractions of components, including: homopolymer polypropylene: 90-95wt%; colorless fluorescent agent: 1-2wt%; other additives: 3-6wt%; The outer sides of the fluorescent anti-counterfeiting layer and the nano moisture-proof layer are both provided with a heat-sealing bonding layer, and the heat-sealing bonding layer is used to improve the heat-sealing performance and bonding effect of the cigarette film. The heat-sealing bonding layer is prepared from raw materials with the following weight fractions of components, including: copolymer polypropylene: 88-95wt%; anti-adhesion agent: 2-8wt%; slip agent: 2-8wt%.

2. The anti-counterfeiting cigarette packaging film according to claim 1, characterized in that: The base layer, the fluorescent anti-counterfeiting layer and the heat-sealing laminating layer are melt-mixed respectively after raw material proportioning, and then introduced into an extruder respectively to form a multi-layer film through a multi-layer co-extrusion technology.

3. A method for preparing an anti-counterfeit cigarette packaging film as claimed in claims 1 and 2, characterized in that: Said Step 1: Uniform coating: Use a precision coating machine to evenly apply the special coating on the base film; Step 2: High temperature molding: Use a pre-patterned molding plate to pressurize the special coating in a high temperature chamber; Step 3: Cooling: Use the heat exchanger in the cooling chamber to cool the membrane as it passes through; Step 4: Vacuum spraying: using a spraying device in a vacuum chamber to evenly spray nano-scale metal particles on the laser coating, wherein the nano-scale metal particles are one of aluminum, chromium, and nickel; Step 5: Uniform spray coating: Use coating equipment to evenly spray the nano moisture-proof solvent on the film body after vacuum spraying, and then dry and cure it after spraying.

4. The method for preparing an anti-counterfeit cigarette packaging film according to claim 3, characterized in that: The anti-adhesion agent is a silicon dioxide anti-adhesion agent, and the lubricant is an erucic acid amide internal lubricant.

5. The method for preparing an anti-counterfeit cigarette packaging film according to claim 3, characterized in that: In step 1 and step 2, the special coating is prepared from raw materials with the following weight fractions of components, including: polyacrylate resin: 80-90wt%; titanium oxide powder: 1-3wt%; ethyl acetate: 3-8wt%; other additives: 5-10wt%.

6. The method for preparing an anti-counterfeit cigarette packaging film according to claim 3, characterized in that: In step three, the heat exchanger equipment can be used to transfer the membrane to the next process so that the membrane is indirectly in contact with the cooling medium to achieve the effect of heat exchange and cooling.

7. The method for preparing an anti-counterfeit cigarette packaging film according to claim 3, characterized in that: In step 4, the thickness of the vacuum coating is 15-20um.

8. The method for preparing an anti-counterfeit cigarette packaging film according to claim 3, characterized in that: In step five, the nano moisture-proof solvent is formed into a film with a thickness of 0.2-0.5 um.

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