Antiseptic card and method of making same

Abstract

The application discloses a kind of anticorrosive card and its preparation method, anticorrosive card includes sequentially stacked carrier paperboard, anticorrosion function layer and pressure discoloration ink layer.Pressure discoloration ink layer includes several transparent polymer microspheres, and several transparent polymer microspheres are arranged according to predetermined lattice structure order arrangement.Pressure discoloration ink layer is configured as when pressure changes, the arrangement interval and / or lattice structure of transparent polymer microspheres are changed, and then the wavelength of light that pressure discoloration ink layer can reflect is changed.Discoloration ink of pressure discoloration ink layer is changed when vacuum packaging bag is broken and leaks, and the atmospheric pressure that is received changes, so as to present different color from the packaging of unbroken and leaks, that is, it can be judged that the packaging is broken, reduce the risk of deteriorated food being misfed, improve the practicability and safety of packaging.

Description

Technical Field

[0001] This application relates to the field of food packaging technology, and in particular to an anti-corrosion card and its preparation method. Background Technology

[0002] Vacuum-sealed packaging is commonly used in industries such as food and tea markets, with an internal preservation card to extend the product's shelf life. However, traditional preservation cards only offer basic preservation and cannot effectively detect whether the packaging is leaking or whether the product is still safe to consume. Summary of the Invention

[0003] This application aims to provide an anti-corrosion card and a method for preparing the same, with the goal of improving the functionality of the anti-corrosion card.

[0004] In a first aspect, this application proposes an anti-corrosion card, comprising a carrier cardboard, an anti-corrosion functional layer, and a pressure-sensitive color-changing ink layer stacked sequentially. The pressure-sensitive color-changing ink layer comprises a plurality of transparent polymer microspheres, which are arranged in an orderly manner according to a predetermined crystal lattice structure. The pressure-sensitive color-changing ink layer is configured to change the spacing and / or crystal lattice structure of the transparent polymer microspheres when the pressure changes, thereby changing the wavelength of the light that the pressure-sensitive color-changing ink layer can reflect.

[0005] In the above scheme, the carrier cardboard provides physical support and load-bearing capacity for the other components of the anti-corrosion card, while the anti-corrosion functional layer provides anti-corrosion protection, reducing food spoilage during transportation. The pressure-sensitive ink layer's color-changing ink changes color under atmospheric pressure when the vacuum packaging bag is damaged and leaking, thus displaying a different color than the undamaged packaging. This allows for identification of packaging damage, reducing the risk of accidental ingestion of spoiled food and improving the practicality and safety of the packaging.

[0006] In some embodiments, the corrosion-resistant card further includes a coating layer. The coating layer is disposed on the side of the pressure-sensitive ink layer opposite to the corrosion-resistant functional layer. By providing a coating layer that covers the other structural layers of the corrosion-resistant card, the coating layer can provide protection to the other structural layers of the corrosion-resistant card and can improve the mechanical strength and durability of the corrosion-resistant card.

[0007] In some embodiments, the corrosion-resistant card further includes a composite layer disposed between the pressure-sensitive color-changing ink layer and the corrosion-resistant functional layer. The composite layer is a polymer layer of the other structural layers of the corrosion-resistant card; by providing the composite layer, the other structural layers of the corrosion-resistant card can be bonded more tightly, improving the overall structural stability of the corrosion-resistant card.

[0008] In some embodiments, the thickness of the composite layer is 3μm-5μm. Setting the composite layer thickness to 3μm-5μm allows the composite layer to stably bond with other structural layers, reducing the possibility of excessive mechanical strength and stiffness in the anti-corrosion card due to an excessively thick composite layer, which would affect its usability. It also reduces the possibility of insufficient mechanical strength in the anti-corrosion card due to an excessively thin composite layer, which would make it prone to bending and breakage.

[0009] In some embodiments, the thickness of the pressure-sensitive color-changing ink layer is 10μm-15μm. Setting the thickness of the pressure-sensitive color-changing ink layer to 10μm-15μm ensures that the layer accurately and brightly reflects the color of the reflected light, with stable performance. This reduces the problems of dull structural colors, low saturation, and poor reflectivity caused by excessive thickness. It also reduces the problems of high-order reflections, superimposed composite colors, and unclear color rendering that are difficult to distinguish caused by excessive thickness.

[0010] In some embodiments, the coating layer comprises a transparent PET film with a thickness of 12 μm-25 μm. The transparent PET film, with a thickness of 12 μm-25 μm, forms a barrier layer in the preservative-protected card, reducing the migration of substances from the inner layer into the food and minimizing the entry of external moisture and oxygen into the inner layer, thus enhancing protection. Furthermore, the PET film can be used to print instruction information and control the release rate of preservative gases, improving the functionality of the preservative-protected card and extending its lifespan. An appropriate thickness provides the preservative-protected card with sufficient tensile and impact strength, reducing the problems of poor barrier effect and migration of inner layer substances to the outside caused by an excessively thin coating layer.

[0011] In some embodiments, the thickness of the carrier paperboard is 0.3mm-0.5mm. Setting the thickness of the carrier paperboard to 0.3mm-0.5mm provides sufficient rigidity for the anti-corrosion card, allowing it to maintain a stable shape. Furthermore, it adapts well to subsequent processing such as die-cutting and creasing, improving the yield rate.

[0012] In some embodiments, the composite layer comprises a solvent-free polyurethane composite adhesive. The use of a solvent-free polyurethane composite adhesive in the composite layer eliminates the risk of solvent residue and is well-suited for the environment of food vacuum packaging. It offers faster lamination, allowing for a more secure and rapid bonding of other structural layers. Furthermore, the solvent-free polyurethane composite adhesive exhibits excellent environmental performance, reducing the content of volatile organic compounds (VOCs).

[0013] In some embodiments, the preservative layer includes a sulfur dioxide (sodium metabisulfite) releaser. The sulfur dioxide releaser in the mixed sodium metabisulfite layer, acting as a preservative or preservative agent in the preservative layer, can effectively inhibit various microorganisms that cause food spoilage, such as yeasts and molds. It can also inhibit the activity of food oxidases, reducing food flavor deterioration.

[0014] Secondly, this application provides a method for preparing an anti-corrosion card as described in any embodiment of the first aspect, comprising the following steps: An anti-corrosion functional layer is coated on the surface of the carrier paperboard to obtain the first film.

[0015] A pressure-sensitive color-changing ink layer with a thickness of 10μm-15μm is coated on one side of the coating layer to obtain a second film.

[0016] A composite layer with a thickness of 3μm-5μm is coated on the surface of the pressure-sensitive color-changing ink layer of the second film. After drying, it is combined with the anti-corrosion functional layer of the first film.

[0017] In the above scheme, the carrier paperboard of the first film provides physical support for the anti-corrosion functional layer, and the preservative or freshness-preserving agent in the anti-corrosion functional layer provides anti-corrosion or freshness preservation for the anti-corrosion card. The orderly arrangement of several transparent polymer microspheres in the pressure-sensitive ink layer of the second film allows the pressure-sensitive ink layer to display different colors after the anti-corrosion card is subjected to pressure changes. The coating layer provides protection for the pressure-sensitive ink layer, reducing its migration and contamination of other structural layers. A composite layer is coated on the surface of the pressure-sensitive ink layer, and the first and second films are bonded together through the composite layer to form the anti-corrosion card. The composite layer makes the bonding between the various structural layers of the anti-corrosion card tighter, improving the structural stability and mechanical strength of the anti-corrosion card.

[0018] Additional aspects and advantages of the embodiments of this application will be described, shown, or illustrated in part by way of implementation of the embodiments of this application in the following description. Attached Figure Description

[0019] One or more embodiments are illustrated by way of example with reference to the accompanying drawings, which are not intended to limit the embodiments, and elements having the same reference numerals in the drawings are designated as similar elements.

[0020] Figure 1 This is a schematic diagram of the structure of the anti-corrosion card according to some embodiments of this application; Figure 2 This is a flowchart illustrating the preparation method of anti-corrosion cards according to some embodiments of this application.

[0021] Explanation of reference numerals in the attached drawings: 1. Coating layer; 2. Pressure-sensitive color-changing ink layer; 3. Composite layer; 4. Anti-corrosion functional layer; 5. Carrier paperboard. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0023] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0024] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0025] The technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0026] In one aspect, this application proposes an anti-corrosion card, comprising a carrier paperboard 5, an anti-corrosion functional layer 4, and a pressure-sensitive color-changing ink layer 2, which are stacked sequentially.

[0027] The carrier paperboard 5 mentioned above is the main carrier of the preservation card, carrying and releasing the active ingredients, and providing physical support for other components as a base material. Preservation cards are packaging materials that typically come into direct contact with food, and their carrier paperboard 5 is usually made of food-grade paperboard material. Different materials can be selected according to requirements, such as food-grade base paper, food-grade white cardboard, or food-grade activated carbon fiber paper. Food-grade base paper, made from plant fibers, has good liquid adsorption capacity and can be used for basic food preservation. Food-grade white cardboard also has the adsorption properties of plant fibers, but its surface smoothness is higher, resulting in better printing effects, making it suitable for products with higher requirements for appearance and printing quality. Food-grade activated carbon fiber paper not only has strong adsorption capacity but can also adsorb odors or specific gases, making it suitable for products requiring enhanced adsorption performance.

[0028] The aforementioned anti-corrosion functional layer 4 is adsorbed onto the carrier cardboard 5 and is the main functional layer of the anti-corrosion card that plays a role in preventing corrosion. The anti-corrosion functional layer 4 typically contains preservatives or fresh-keeping agents to enhance its anti-corrosion effect. Different types of preservatives or fresh-keeping agents can be selected depending on the type of food. For example, alcohol-based, oxygen absorbers, or compound preservatives. Alcohol-based preservatives release edible alcohol gas, which kills or inhibits mold, bacteria, and other microorganisms on the food surface through gas-phase action; they are commonly used for pastries. Oxygen absorbers absorb oxygen within the packaging through components such as iron powder, creating a low-oxygen or even oxygen-free environment for the food; they are commonly used for tea or dried fruits. Compound preservatives are typically used for fruit preservation or other foods with higher preservation requirements.

[0029] The pressure-sensitive color-changing ink layer 2 described above contains color-changing ink, which is the main component responsible for the color-changing effect of the anti-corrosion card. The color-changing ink comprises several nano-sized transparent polymer microspheres arranged in an orderly manner to form a photonic crystal, allowing the ink to selectively reflect light of a specific color, thus displaying a particular color. When subjected to pressure, the lattice between the polymer microspheres changes indirectly, causing the displayed color to also change.

[0030] The pressure-sensitive color-changing ink layer 2 comprises a plurality of transparent polymer microspheres arranged in an ordered manner according to a predetermined lattice structure. The pressure-sensitive color-changing ink layer 2 is configured to change the spacing and / or lattice structure of the transparent polymer microspheres when pressure changes, thereby altering the wavelength of light reflected by the ink layer 2. For example, when the pressure-sensitive ink layer is subjected to pressure, the pressure is transmitted to the transparent polymer microspheres, forcing them to displace. This changes the spacing between the microspheres, thus altering the wavelength of the reflected light. It is understood that when the wavelength of light reflected by the pressure-sensitive color-changing ink layer 2 changes, different colors can be displayed. For example, if the spacing between the microspheres decreases, the wavelength of the reflected light decreases, and the color changes from red to blue.

[0031] In the above scheme, the carrier cardboard 5 provides physical support and load-bearing function for the other components of the anti-corrosion card, while the anti-corrosion functional layer 4 provides anti-corrosion function, reducing food spoilage during transportation. When the vacuum packaging bag is damaged and leaks air, the color-changing ink in the pressure-changing ink layer 2 changes due to atmospheric pressure, thus displaying a different color than the undamaged packaging. This allows for identification of packaging damage, reducing the risk of accidental ingestion of spoiled food and improving the practicality and safety of the packaging.

[0032] In some embodiments, the anti-corrosion card further includes a coating layer 1. The coating layer 1 is disposed on the side of the pressure-sensitive color-changing ink layer 2 facing away from the anti-corrosion functional layer 4. The coating layer 1 covers the other structural layers of the anti-corrosion card, providing protection for these layers and improving the card's mechanical strength and durability. It is understood that different materials for the coating layer 1 can be selected depending on the application scenario, such as PET (polyester), PE (polyethylene), or PP (polypropylene). PET has good high and low temperature resistance and chemical corrosion resistance; PE is relatively soft and can conform well to curved surfaces; and PP is suitable for environments requiring transparency.

[0033] In some embodiments, the anti-corrosion card further includes a composite layer 3, which is disposed between the pressure-sensitive color-changing ink layer 2 and the anti-corrosion functional layer 4. The composite layer 3 is a polymer layer of the other structural layers of the anti-corrosion card. By providing the composite layer 3, the other structural layers of the anti-corrosion card can be bonded more tightly, thereby improving the overall structural stability of the anti-corrosion card.

[0034] In some embodiments, the thickness of composite layer 3 is 3μm-5μm. Setting the thickness of composite layer 3 to 3μm-5μm allows it to stably bond with other structural layers, reducing the likelihood of excessive mechanical strength and stiffness in the anti-corrosion card due to an excessively thick composite layer 3, which would affect its usability. It also reduces the likelihood of insufficient mechanical strength and easy bending or breakage in the anti-corrosion card due to an excessively thin composite layer 3.

[0035] In some embodiments, the thickness of the pressure-sensitive color-changing ink layer 2 is 10μm-15μm. Setting the thickness of the pressure-sensitive color-changing ink layer 2 to 10μm-15μm ensures that the layer accurately and brightly reflects the color of the reflected light, and maintains stable performance. This reduces the problems of dull structural colors, low saturation, and poor reflectivity caused by excessive thickness. It also reduces the problems of high-order reflections that may occur due to excessive thickness, resulting in superimposed composite colors, unclear color rendering, and difficulty in distinguishing colors.

[0036] In some embodiments, the coating layer 1 comprises a transparent PET film, and the thickness of the coating layer 1 is 12μm-25μm. The transparent PET film is disposed on the coating layer 1, and its thickness is set to 12μm-25μm. The PET film can serve as a barrier layer for the preservation card, reducing the migration of inner layer material into the food, and also reducing the entry of external moisture and oxygen into the inner layer, thus improving the protective effect. Furthermore, the PET film can be used to print instruction information and control the release rate of preservative gases, thereby improving the functionality of the preservation card and extending its service life. An appropriate thickness can provide the preservation card with sufficient tensile strength and impact resistance, reducing the problems of poor barrier effect and migration of inner layer material to the outside caused by an excessively thin coating layer 1.

[0037] In some embodiments, the thickness of the carrier paperboard 5 is 0.3mm-0.5mm. Setting the thickness of the carrier paperboard 5 to 0.3mm-0.5mm provides sufficient rigidity for the anti-corrosion card, allowing it to maintain a stable shape. Furthermore, it adapts well to subsequent processing such as die-cutting and creasing, improving the yield rate.

[0038] In some embodiments, composite layer 3 comprises a solvent-free polyurethane composite adhesive. The solvent-free polyurethane composite adhesive in composite layer 3 eliminates the risk of solvent residue and is well-suited for the environment of food vacuum packaging. It offers faster lamination, allowing for a more secure and rapid bonding of other structural layers. Furthermore, the solvent-free polyurethane composite adhesive exhibits excellent environmental performance, reducing the content of volatile organic compounds (VOCs).

[0039] In some embodiments, the preservative functional layer 4 includes a sulfur dioxide (sodium metabisulfite) releaser. The sulfur dioxide releaser, a mixture of sodium metabisulfite and oil, can effectively inhibit various microorganisms that cause food spoilage, such as yeasts and molds, as a preservative or preservative agent in the preservative functional layer 4. It can also inhibit the activity of food oxidases, reducing food flavor deterioration.

[0040] Secondly, this application provides a method for preparing an anti-corrosion card as described in any embodiment of the first aspect, comprising the following steps: An anti-corrosion functional layer 4 is coated on the surface of the carrier paperboard 5 to obtain the first film.

[0041] A pressure-sensitive color-changing ink layer 2 is coated on one side of the coating layer 1, with a coating thickness of 10μm-15μm, to obtain a second film.

[0042] A composite layer 3 with a thickness of 3μm-5μm is coated on the surface of the pressure-sensitive color-changing ink layer 2 of the second film. After drying, it is combined with the anti-corrosion functional layer 4 of the first film.

[0043] In the above scheme, the carrier paperboard 5 of the first film provides physical support for the anti-corrosion functional layer 4, and the preservative or freshness-preserving agent in the anti-corrosion functional layer 4 provides anti-corrosion or freshness-preserving effects for the anti-corrosion card. The orderly arrangement of several transparent polymer microspheres in the pressure-sensitive ink layer 2 of the second film causes the pressure-sensitive ink layer 2 to display different colors after the anti-corrosion card is subjected to pressure changes. The coating layer 1 provides protection for the pressure-sensitive ink layer 2, reducing its migration and contamination of other structural layers. A composite layer 4 is coated on the surface of the pressure-sensitive ink layer 2, and the first film and the second film are laminated together through the composite layer 3 to form the anti-corrosion card. The composite layer 4 can make the bonding between the various structural layers of the anti-corrosion card tighter, improving the structural stability and mechanical strength of the anti-corrosion card.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this application as described above, which are not provided in detail for the sake of brevity; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An anti-corrosion card, characterized in that, It includes a carrier paperboard, an anti-corrosion functional layer, and a pressure-sensitive color-changing ink layer stacked in sequence; the pressure-sensitive color-changing ink layer includes a plurality of transparent polymer microspheres, which are arranged in an orderly manner according to a predetermined crystal lattice structure. The pressure-sensitive color-changing ink layer is configured to change the spacing and / or lattice structure of the transparent polymer microspheres when the pressure changes, thereby changing the wavelength of the light that the pressure-sensitive color-changing ink layer can reflect.

2. The anti-corrosion card according to claim 1, characterized in that, The anti-corrosion card also includes a coating layer; the coating layer is disposed on the side of the pressure-sensitive color-changing ink layer opposite to the anti-corrosion functional layer.

3. The anti-corrosion card according to claim 2, characterized in that, The anti-corrosion card also includes a composite layer disposed between the pressure-sensitive color-changing ink layer and the anti-corrosion functional layer.

4. The anti-corrosion card according to claim 3, characterized in that, The thickness of the composite layer is 3μm-5μm.

5. The anti-corrosion card according to claim 1, characterized in that, The thickness of the pressure-sensitive color-changing ink layer is 10μm-15μm.

6. The anti-corrosion card according to claim 1, characterized in that, The coating layer comprises a transparent PET film, and the thickness of the coating layer is 12μm-25μm.

7. The anti-corrosion card according to claim 3, characterized in that, The thickness of the carrier paperboard is 0.3mm-0.5mm.

8. The anti-corrosion card according to claim 4, characterized in that, The composite layer comprises a solvent-free polyurethane composite adhesive.

9. The anti-corrosion card according to claim 2, characterized in that, The anti-corrosion functional layer includes a sulfur dioxide releasing agent.

10. A method for preparing an anti-corrosion card as described in any one of claims 1-9, characterized in that, Includes the following steps: The anti-corrosion functional layer is coated on the surface of the carrier paperboard to obtain a first film; The pressure-sensitive color-changing ink layer is coated on one side of the coating layer with a coating thickness of 10μm-15μm to obtain a second film. The composite layer is coated on the surface of the pressure-sensitive color-changing ink layer of the second film, with a coating thickness of 3μm-5μm. After drying, it is combined with the anti-corrosion functional layer of the first film.

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