Degradable holographic anti-counterfeiting laser packaging material and preparation method thereof

Abstract

The invention relates to the technical field of flexible packaging, in particular to a degradable holographic anti-counterfeiting laser packaging material and a preparation method thereof. The degradable holographic anti-counterfeiting laser packaging material comprises a surface coating, a first polylactic acid film layer, a first adhesive layer, a holographic laser layer, a vacuum aluminum-plated layer, a second adhesive layer and a second polylactic acid film layer, the surface coating, the first polylactic acid film layer, the first adhesive layer, the holographic laser layer, the vacuum aluminum-plated layer, the second adhesive layer and the second polylactic acid film layer are sequentially arranged from top to bottom. The packaging material provided by the invention has the characteristics of heat sealability, degradability and direct food contact, and also has a very good anti-counterfeiting effect and a beautiful appearance.

Description

Technical Field

[0001] The invention relates to the technical field of soft packaging, and in particular to a degradable holographic anti-counterfeiting laser packaging material and a preparation method thereof. Background Art

[0002] As people gradually deepen their understanding of environmental protection and sustainable development, the research and application of degradable materials have attracted more and more attention. Compared with traditional plastic products, degradable plastic products can be degraded by nature, which can effectively reduce the impact of plastic pollution on the environment. Compared with traditional materials, existing degradable packaging materials do not have novel and beautiful appearance effects, nor do they have high-tech anti-counterfeiting functions.

[0003] More and more customers have put forward higher requirements on the appearance and anti-counterfeiting performance of products. Summary of the invention

[0004] In view of the above-mentioned shortcomings, the present invention provides a degradable holographic anti-counterfeiting laser packaging material and a preparation method thereof, which can achieve a novel and beautiful appearance effect and a high-tech anti-counterfeiting function while being degradable.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A degradable holographic anti-counterfeiting laser packaging material comprises a top coating, a first degradable film layer, a first adhesive layer, a holographic laser layer, a vacuum aluminum coating layer, a second adhesive layer, and a second degradable film layer; the top coating, the first degradable film layer, the first adhesive layer, the holographic laser layer, the vacuum aluminum coating layer, the second adhesive layer, and the second degradable film layer are arranged in sequence from top to bottom.

[0007] The upper surface of the top coating layer is adhered to and connected with the first degradable film layer; the first degradable film layer is combined with the holographic laser layer through the first adhesive layer; the holographic laser layer attaches the aluminum layer to the inner side of the first degradable film layer by vacuum aluminum plating; the vacuum aluminum plating layer is then bonded to the second degradable film layer through the second adhesive layer.

[0008] The holographic laser layer includes a transparent resin, and reflective metal particles are mixed inside the transparent resin.

[0009] Preferably, the first degradable film layer and the second degradable film layer are made of degradable materials and meet biodegradation requirements.

[0010] Preferably, the first degradable film layer and the second degradable film layer are both made of polylactic acid film, which may also be replaced by other degradable films, such as butylene terephthalate film or polybutylene succinate film.

[0011] Preferably, the first adhesive layer and the second adhesive layer are bio-based adhesives, which can meet the degradation requirements.

[0012] Preferably, the thickness of the holographic laser layer is 0.1-0.2um, the thickness of the first adhesive layer and the second adhesive layer is 0.1-0.2um, the thickness of the first degradable film layer and the second degradable film layer is 20-50um, and the thickness of the vacuum aluminum coating layer is 0.3-0.4μm.

[0013] Preferably, the holographic laser layer material is water-based polyurethane coating, and its content in the finished product is less than 1.5%.

[0014] Preferably, the holographic laser layer is hollowed out at the heat-sealing position to facilitate heat-sealing molding.

[0015] The second object of the present invention is to provide a method for preparing a degradable holographic anti-counterfeiting laser material, comprising the following steps:

[0016] (1) taking a 14uPET non-corona base film, uniformly coating it with a waterborne polyurethane resin coating by gravure screen coating, and drying and curing it to obtain a PET coating transfer film in which a PET base film layer and a resin layer are combined;

[0017] (2) taking the PET coating transfer film obtained in step (1), and embossing a holographic laser layer having various anti-counterfeiting laser information on the coating layer, thereby obtaining a PET laser transfer film;

[0018] (3) Use vacuum aluminum plating machine to coat aluminum wire at 10 -2 ~10 -3 Under the vacuum condition of 1.5 Pa, it is heated and gasified, and then cooled and attached to the holographic laser layer of the PET laser transfer film, thus obtaining the PET laser transfer aluminum-plated film;

[0019] (4) using a bio-based transferable adhesive to laminate the PET laser transfer aluminum film and the polylactic acid film together through a laminating machine, and then placing the film in a drying room for aging for 24 hours;

[0020] (5) using a rewinder to peel off the PET on the composite film obtained in step (4), so that the holographic laser layer is transferred to the polylactic acid film, thereby obtaining a polylactic acid film with a laser effect;

[0021] (6) Using the film obtained in step (5), another polylactic acid film is laminated on the back side by a laminating machine using a bio-based composite adhesive, and then placed in a drying room for aging for 24 hours;

[0022] (7) coating the film obtained in step (6) with a nanoscale water-based embossing topcoat using a coating machine, and cutting the film into required sizes;

[0023] (8) The slitting machine slits and cuts the paper bags into the required specifications.

[0024] Preferably, the proportion of reflective metal added in step (1) is 0.2%, the viscosity of the coating is controlled at 23-25s, and the dry coating weight is controlled at 1.10-1.15g / m 2 .

[0025] In a further solution, the thermal efficiency of the oven is controlled at 82-88; and the base film required for coating is a non-corona film.

[0026] In a further embodiment, the adhesive compounded in step (4) (6) is a bio-based degradable glue, and the amount of glue applied is controlled at 1.5-2.0 g / m 2 .

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] The holographic laser anti-counterfeiting message layer presents various laser elements of design on the holographic plate at the same time through multiple levels of depth and angle. It can be positioned or randomly arranged to achieve a variety of anti-counterfeiting effects.

[0029] The present invention can directly realize laser and anti-counterfeiting effects on the surface of the polylactic acid film, and can also be directly heat-sealed and formed;

[0030] The invention adds a metal aluminum layer, and the structure is more reasonable, which effectively improves the moisture and oxygen barrier effects of the polylactic acid film bag, and the bag body is not easy to be damaged and has a long service life, thereby improving the shelf life of the product;

[0031] During the processing, the risk of direct contact between food and chemical materials can be avoided by controlling the film side to face outward, thus meeting the specific indicators of the product's food-grade packaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure of the packaging material of the present invention;

[0033] Description of symbols in the figure

[0034] 1-top coating, 2-first polylactic acid film layer, 3-first adhesive layer, 4-holographic laser layer, 5-vacuum aluminum plating layer, 6-second adhesive layer, 7-second polylactic acid film layer. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0036] Example

[0037] like Figure 1 As shown, a degradable holographic anti-counterfeiting laser packaging material comprises, from outside to inside, a top coating 1, a first polylactic acid film layer 2 (PLA) adhered to the top coating 1, a first adhesive layer 3 bonded to the first polylactic acid film layer, the first adhesive layer 3 is connected to a holographic laser layer 4, the holographic laser layer 4 is connected to a vacuum aluminum-plated layer 5, and the vacuum aluminum-plated layer 5 is bonded to a second polylactic acid film layer 7 (PLA) through a second adhesive layer 6.

[0038] The above-mentioned degradable holographic anti-counterfeiting laser packaging material is made by the following method:

[0039] Step 1: Select a suitable solvent-based coating and stir it with a matching additive at a ratio of 0.2%, stir at high speed for 20 minutes, and obtain a mixed solution for use;

[0040] Step 2: Use 14uPET base film to coat the mixed solution prepared in step 1 through a gravure coater, and after drying, obtain the holographic laser anti-counterfeiting layer, i.e., the pre-material of the holographic laser layer 4. Note that 200 mesh wire is generally selected, and the mesh uniformity must be good to make the coating uniform. A stirring device is required during the coating process; the thermal efficiency of the coating oven is controlled at 82-88 (the "thermal efficiency" in this part refers to a column of squares on the small sticker, representing different temperature values. When the temperature rises to this temperature point, the squares will turn black, and will not return to the original color even after the temperature drops. This can tell the highest temperature the product has ever experienced);

[0041] Step three, after PET coating, various holographic anti-counterfeiting laser effects are embossed onto the PET coating layer by soft pressing or medium pressure molding to obtain a holographic laser anti-counterfeiting layer, namely, the holographic laser layer 4. During the process, special attention should be paid to using 3M tape to wrap the plate, and pay attention to the neatness of the layout. The depth of various layouts will also determine the different molding temperatures. The main standards are pressure penetration, brightness and compaction. Generally, the molding temperature is controlled at 155°C. At the same time, the left and right color difference and the phenomenon of color sticking are controlled. The tension should not be too large to prevent deformation during winding, and the PET laser transfer film is obtained.

[0042] Step 4: Use a vacuum aluminum plating machine to coat the obtained PET laser transfer film with high-purity aluminum wire at 10 -2 ~10 -3Pa, heated to about 1400 degrees Celsius to vaporize, and then cooled to adhere to the holographic laser anti-counterfeiting message layer, i.e., the holographic laser layer 4, to obtain a PET laser transfer aluminum film with a holographic pattern effect, wherein the thickness of the vacuum aluminum layer 5 is 35 to 40 nanometers (380 angstroms);

[0043] Step 5: Compound the PET laser transfer aluminized film onto the polylactic acid (PLA) film using a compounding machine, using a bio-based degradable transfer adhesive, and apply adhesive to the aluminum surface of the PET laser transfer aluminized film, and ripen for 24 hours;

[0044] Step 6: After aging, the PET on the surface is peeled off and removed by a rewinding machine to obtain a polylactic acid film with a holographic anti-counterfeiting effect;

[0045] Step 7: Compounding the polylactic acid film with holographic laser anti-counterfeiting effect obtained in step 6 with another transparent polylactic acid film by a compounding machine using a bio-based degradable compound adhesive, and aging for 24 hours;

[0046] Step 8, coating the roll polylactic acid film obtained in step 7 with a water-based nano-molecular top coating by a coating machine, and coating the polylactic acid film on the side with the laser layer;

[0047] Step nine, the slitting machine divides the bags into the required sizes and makes them into the required bag shapes as required;

[0048] According to the terminal product or market demand, the holographic laser anti-counterfeiting effect can be arbitrarily selected and combined, and produced and processed according to the needs.

[0049] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A degradable holographic anti-counterfeiting laser packaging material, characterized in that: It includes a top coating, a first degradable film layer, a first adhesive layer, a holographic laser layer, a vacuum aluminum coating layer, a second adhesive layer, and a second degradable film layer; the top coating, the first degradable film layer, the first adhesive layer, the holographic laser layer, the vacuum aluminum coating layer, the second adhesive layer, and the second degradable film layer are arranged in sequence from top to bottom.

2. The degradable holographic anti-counterfeiting laser packaging material according to claim 1, characterized in that: The first degradable film layer and the second degradable film layer are both made of polylactic acid film, butylene terephthalate film or polybutylene succinate film.

3. The degradable holographic anti-counterfeiting laser packaging material according to claim 1, characterized in that: Both the first adhesive layer and the second adhesive layer use bio-based adhesives.

4. The degradable holographic anti-counterfeiting laser packaging material according to claim 1, characterized in that: The holographic laser layer coating is a water-based polyurethane coating, and its content in the finished product is less than 1.5%.

5. The degradable holographic anti-counterfeiting laser packaging material according to claim 1, characterized in that: The thickness of the vacuum aluminum coating is 0.3-0.4um.

6. The degradable holographic anti-counterfeiting laser packaging material according to claim 4, characterized in that: Water-based polyurethane paint has reflective metallic particles mixed into it.

7. The degradable holographic anti-counterfeiting laser packaging material according to claim 2, characterized in that: The polylactic acid film, butylene terephthalate film or polybutylene succinate film has a thickness of 20-50 um when used.

8. The degradable holographic anti-counterfeiting laser packaging material according to claim 4, characterized in that: The holographic laser layer is hollowed out at the heat-sealed position.

9. A method for preparing a degradable holographic anti-counterfeiting laser packaging material, characterized in that: The following steps are involved: (1): Take 14uPET non-corona base film, evenly apply water-based polyurethane resin coating by gravure screen coating, and dry and solidify to obtain a PET coating transfer film combining a PET base film layer and a resin layer; (2): Take the PET coating transfer film obtained in step (1), and emboss a holographic laser layer having various anti-counterfeiting laser information on the coating layer to obtain a PET laser transfer film; (3): Use vacuum aluminum plating machine to coat aluminum wire at 10 -2 ~10 -3 Pa vacuum condition, heat and vaporize, and then cool and adhere to the holographic laser layer of the PET laser transfer film, thus obtaining the PET laser transfer aluminum film; (4): The PET laser transfer aluminum film and the polylactic acid film are laminated together using a bio-based transferable adhesive through a laminating machine and placed in a drying room for 24 hours; (5): Use a rewinder to peel off the PET on the composite film obtained in step (4), so that the holographic laser layer is transferred to the polylactic acid film, thereby obtaining a polylactic acid film with a laser effect; (6): Using the film obtained in step (5), another polylactic acid film is laminated on the back side by a laminating machine using a bio-based composite adhesive, and then placed in a drying room for aging for 24 hours; (7): Use a coating machine to coat the film obtained in step (6) with a nanoscale water-based embossing topcoat and cut it into required sizes; (8): The paper bag is cut into strips by the slitting machine and the paper bag is cut into the required specifications.

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