Heat preservation packaging box

Abstract

The utility model discloses a heat preservation packaging box which is made of a packaging base material, a foaming layer is arranged on the packaging base material, and the foaming layer is obtained by printing foaming ink. The core structure of the heat preservation packaging box comprises a foaming layer. The foaming layer is obtained by printing foaming ink, and the foaming layer can provide excellent heat preservation performance for the packaging box and can effectively prevent external heat from entering the box, so that a thermosensitive product is prevented from deteriorating due to heat absorption. Compared with a traditional thermal insulation material, the foaming layer printed by the foaming ink not only has an excellent thermal insulation effect, but also has a remarkable cost advantage and an environment-friendly characteristic. The production process does not need complex processes and expensive materials, and meanwhile potential hazards of traditional thermal insulation materials to the environment are avoided.

Description

Technical Field

[0001] This utility model relates to the field of packaging technology, and in particular to an insulated packaging box. Background Technology

[0002] In the cold chain transportation sector, the poor insulation performance of traditional corrugated cardboard boxes is a pressing issue. Especially in areas with weak cold chain management, if the cold chain system malfunctions and external temperatures rise, heat-sensitive products inside the corrugated cardboard boxes are highly susceptible to heat absorption and deterioration, severely impacting product quality and safety. While some insulated packaging boxes made with materials like thermal insulation cotton have emerged on the market, these products, although improving insulation performance to some extent, have higher production costs, and the use of such materials is not environmentally friendly and does not meet the requirements of sustainable development. Therefore, developing a low-cost, environmentally friendly cold chain packaging solution with excellent insulation performance has become a crucial issue facing the cold chain transportation industry. Utility Model Content

[0003] Therefore, it is necessary to provide an insulated packaging box to solve the above problems.

[0004] An insulated packaging box is made of a packaging substrate, wherein a foam layer is provided on the packaging substrate, and the foam layer is obtained by printing with foaming ink.

[0005] The aforementioned insulated packaging box includes a foam layer, which provides excellent insulation and prevents heat-sensitive products inside from absorbing heat and deteriorating. Furthermore, since the foam layer is printed with foaming ink, it is low-cost and environmentally friendly.

[0006] The core structure of the aforementioned insulated packaging box includes a foam layer. This foam layer, printed with foaming ink, provides excellent insulation performance, effectively preventing external heat from entering the box and thus preventing heat-sensitive products from deteriorating due to heat absorption. Compared to traditional insulation materials, the foam layer printed with foaming ink not only has superior insulation performance but also significant cost advantages and environmental benefits. Its production process does not require complex processes or expensive materials, while avoiding the potential environmental hazards of traditional insulation materials.

[0007] In one embodiment, the packaging substrate is corrugated cardboard, which includes a face paper, a corrugated core paper, and a liner paper stacked together.

[0008] In one embodiment, the face paper is kraft paper.

[0009] In one embodiment, the face paper is cardboard.

[0010] In one embodiment, the face paper is gold cardstock or silver cardstock, and the gold cardstock or silver cardstock includes a base layer and an aluminum foil layer stacked together.

[0011] In one embodiment, the foam layer is disposed on any one side of the packaging substrate.

[0012] In one embodiment, the foamed layer is disposed on the side of the aluminum foil layer facing the corrugated core paper.

[0013] In one embodiment, the side of the face paper away from the corrugated core paper is further provided with printed graphics.

[0014] In one embodiment, a protective layer is provided above the graphic layer.

[0015] In one embodiment, the thickness of the foamed layer is 0.1 mm to 5 mm. Attached Figure Description

[0016] Figure 1 A schematic diagram of an insulated packaging box according to one embodiment;

[0017] Figure 2 This is a schematic diagram of the packaging substrate and foam layer structure according to one embodiment;

[0018] Figure 3 This is a schematic diagram of the packaging substrate and foam layer structure according to another embodiment;

[0019] Figure 4 This is a schematic diagram of the packaging substrate and foam layer structure according to another embodiment. Detailed Implementation

[0020] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is considered to be "connected" or "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "upper," "lower," "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0022] The following section provides a more detailed description of the insulated packaging box, in conjunction with the accompanying drawings and specific embodiments.

[0023] Please see Figure 1 One embodiment of the heat-insulating packaging box is made of a packaging substrate, on which a foam layer 40 is provided, and the foam layer 40 is obtained by printing with foaming ink.

[0024] Packaging substrate, used as the molding material for insulated packaging boxes, is used to manufacture insulated packaging cartons.

[0025] In this embodiment, the packaging substrate is corrugated cardboard, which comprises three layers: a face paper 10, a corrugated core paper 20, and a liner paper 30. The face paper 10 is the outermost layer of the corrugated cardboard. The corrugated core paper 20 is the core part of the corrugated cardboard, located between the face paper 10 and the liner paper 30. It is made of corrugated paper and provides the necessary strength and cushioning performance for the corrugated cardboard. The corrugated core paper 20 is usually classified into different corrugated forms such as A, B, C, E, F, G, and N according to the shape and size of the corrugations. Different corrugated forms are suitable for different packaging needs. The liner paper 30 is the innermost layer of the corrugated cardboard and is usually made of low-strength kraft paper or cardboard.

[0026] Optionally, the face paper 10 is kraft paper. The corrugated board, which includes the face paper 10, the corrugated core paper 20 and the inner paper 30, is a whole and can be directly purchased from the upstream corrugated paper mill. The corrugated board can be directly used as the packaging base material of this utility model.

[0027] Optionally, the face paper 10 is cardboard, and the corrugated paper including the corrugated core paper 20 and the inner paper 30 can be purchased directly from the upstream corrugated paper mill as a whole. The corrugated paper is then laminated with the face paper 10 to obtain corrugated board.

[0028] Preferably, the corrugated paper can be in the form of a component comprising multiple layers of corrugated paper, which enhances the protective and heat-insulating properties of the cold chain packaging box.

[0029] Alternatively, the cardstock may be white cardstock, grey cardstock, gold cardstock, or silver cardstock.

[0030] Preferably, the cardboard is gold or silver cardboard. The gold or silver cardboard includes a base layer 11 and an aluminum foil layer 12 stacked together. On one hand, the aluminum foil layer 12 has excellent heat radiation reflection properties, reflecting external infrared rays to prevent heat from entering the insulated packaging box via heat radiation. On the other hand, the aluminum foil layer 12 has excellent airtightness, preventing convection of gases inside and outside the insulated packaging box and significantly reducing heat transfer efficiency.

[0031] Furthermore, the aluminum foil layer 12 of the gold or silver cardboard is disposed on the side facing the corrugated core paper 20. At this time, the aluminum foil layer 12 is disposed between the base layer 11 and the corrugated core paper 20, thereby preventing the aluminum foil layer 12, which has good thermal conductivity, from conducting external heat into the insulated packaging box.

[0032] It should be understood that the packaging substrate can also be made directly from cardboard, a structure that is particularly common in smaller cold chain packaging boxes.

[0033] The foam layer 40 is disposed on the packaging substrate. The foam layer 40 is obtained by printing and foaming with foaming ink. The special ink layer structure of the foam layer 40 gives it good heat insulation performance.

[0034] Specifically, the foamed ink contains a large number of foamed microspheres with a core-shell structure. The shell is made of a thermoplastic polymer material, which softens under certain temperature conditions. The core is a thermosensitive material, such as a hydrocarbon. When the temperature reaches the core's induction temperature, the thermosensitive material rapidly decomposes or vaporizes, generating a large amount of gas. This causes a sharp increase in core pressure, which in turn causes the shell to expand rapidly several times to hundreds of times in volume under the internal pressure, thus forming a hollow spherical structure.

[0035] Since the foaming temperature of foamed microspheres is typically above 100℃, after foaming is complete, the ambient temperature will gradually decrease. At this time, the air pressure inside the hollow microspheres decreases with the temperature drop. Before the ambient temperature drops to the softening temperature of the shell polymer material, the volume of the hollow microspheres will slightly shrink as the core air pressure decreases. During this expansion-contraction process, numerous micropores will be generated in the foamed layer 40. When the ambient temperature drops to the softening temperature of the shell polymer material, the volume of the hollow microspheres will no longer change, but the air pressure inside the hollow spheres will continue to decrease, forming a closed, low-pressure hollow microsphere. This special structure of micropores and low-pressure hollow microspheres can bring the following beneficial effects:

[0036] (1) This causes heat to have to bypass a large number of pores and interfaces during the transfer process. This complex path increases the resistance to heat conduction, further reducing the efficiency of heat transfer and making the heat conduction process slower. Experiments have shown that this structure can reduce the thermal conductivity of the ink layer from 0.1-0.3 W / (m·K) to 0.005-0.01 W / (m·K), which is an order of magnitude lower than the thermal conductivity of conventional packaging materials such as corrugated cardboard (0.04-0.06 W / (m·K)) and white cardboard (0.05-0.1 W / (m·K), indicating a significant reduction in thermal conductivity.

[0037] (2) In high-temperature environments, thermal radiation is an important way of heat transfer, and the tiny pores and interfaces in the foam layer 40 can reflect and scatter some of the thermal radiation, thereby reducing the transfer of thermal radiation.

[0038] (3) Convection is an important way of heat transfer. The special structure of the foam layer 40 confines air in tiny pores, making it difficult for convection to form. Therefore, this structure inhibits the formation of convection, and the efficiency of heat transfer through convection is greatly reduced, thereby enhancing the thermal insulation performance of the material.

[0039] The location of the foam layer 40 is selectable; it can be placed on any side of the packaging substrate or inside the packaging substrate.

[0040] In this embodiment, the packaging substrate is corrugated cardboard, which is purchased as a whole from an upstream supplier. In this case, the foam layer 40 can be disposed on any side of the corrugated cardboard.

[0041] In another embodiment, the face paper 10 is cardboard, and the packaging substrate includes two separate parts, face paper 10 and corrugated paper, before lamination. In this case, the foam layer 40 can be disposed on the side of the face paper 10 away from the corrugated core paper 20 or the side of the inner paper 30 away from the corrugated core paper 20, or it can be disposed on the side of the cardboard facing the corrugated core paper 20.

[0042] Preferably, the foam layer 40 is disposed on the side of the cardboard facing the corrugated core paper 20. In this case, heat transfer is blocked by the face paper 10, which can effectively reduce the heat transfer efficiency.

[0043] In a preferred embodiment, please refer to Figure 4 The face paper 10 is gold or silver cardboard, and the foam layer 40 is disposed on the side of the aluminum foil layer 12 facing the corrugated core paper 20. At this time, heat transfer passes through the double barrier of the base layer 11 and the aluminum foil layer 12 before reaching the foam layer 40, which can greatly reduce the heat transfer efficiency.

[0044] The number of foam layers (40) is selectable; it can be one or more. Figure 2 In the embodiment shown, the number of foam layers 40 is one; Figure 3 In the embodiment shown, there are two foam layers 40, which are respectively disposed on two sides of the packaging substrate.

[0045] The thickness of the foam layer 40 is 0.1mm-5mm. The thicker the foam layer 40, the better its heat preservation effect. Therefore, the heat preservation effect of the insulated packaging box can be adjusted by adjusting the thickness of the foam layer 40.

[0046] Preferably, the thickness of the foam layer 40 is 1mm-3mm, which can be obtained by one-time screen printing foaming and has strong heat insulation performance.

[0047] Alternatively, the foam layer 40 is obtained by screen printing, gravure printing, coating or spraying.

[0048] It should be understood that foaming ink, as a mature product, is widely used in the fields of clothing and wallpaper. All foaming inks on the market can be used to make the foaming layer of this utility model, and will not be elaborated here.

[0049] Preferably, printed graphics are provided on the side of the face paper 10 away from the corrugated core paper 20. By providing a printed graphics layer to carry product information, the practicality of the insulated packaging box can be increased.

[0050] Furthermore, a protective layer is provided above the printed graphic layer.

[0051] Optionally, the protective layer is an adhesive film layer or a varnish layer.

[0052] The core structure of the aforementioned insulated packaging box includes a foam layer 40. This foam layer 40 is printed using foaming ink and provides excellent insulation performance, effectively preventing external heat from entering the box and thus preventing heat-sensitive products from deteriorating due to heat absorption. Compared to traditional insulation materials, the foam layer 40 printed with foaming ink not only has superior insulation performance but also significant cost advantages and environmental benefits. Its production process does not require complex processes or expensive materials, while avoiding the potential environmental hazards of traditional insulation materials.

[0053] The following are specific examples.

[0054] Example 1

[0055] Please see Figure 1 and Figure 2 This embodiment provides an insulated packaging box made of corrugated cardboard. The corrugated cardboard includes a face paper 10, a corrugated core paper 20, and a liner paper 30 stacked together. A foam layer 40 is provided on the outer surface of the corrugated cardboard. The foam layer 40 is obtained by screen printing foaming ink. In this embodiment, the thickness of the foam layer 40 is 0.5 mm.

[0056] The core structure of the aforementioned insulated packaging box includes a foam layer 40. This foam layer 40 is printed with foaming ink and provides excellent thermal insulation performance for the packaging box, effectively preventing external heat from entering the box and thus preventing heat-sensitive products from deteriorating due to heat absorption.

[0057] Example 2

[0058] Please see Figure 3 This embodiment provides an insulated packaging box, which is similar to the insulated packaging box provided in Embodiment 1, except that: (1) there are two foam layers 40, which are respectively set on the face paper 10 and the inner paper 30 of the corrugated cardboard; (2) the thicknesses of the two foam layers 40 are 1mm and 2mm respectively.

[0059] The above-mentioned insulated packaging box, by setting multiple foam layers 40, can effectively enhance the heat preservation effect of the insulated packaging box.

[0060] Example 3

[0061] Please see Figure 4 This embodiment provides an insulated packaging box, which is similar to the insulated packaging box provided in Embodiment 1, except that: (1) the face paper 10 is silver cardboard, which includes a base layer 11 and an aluminum foil layer 12 stacked together, and a foam layer 40 is disposed on the side of the aluminum foil layer 12 facing the corrugated core paper 20; (2) the thickness of the foam layer 40 is 3mm.

[0062] The aforementioned insulated packaging box, on the one hand, has excellent heat radiation reflection properties, reflecting external infrared rays to prevent heat from entering the packaging box via thermal radiation. On the other hand, the aluminum foil layer 12 has excellent airtightness, preventing convection of gases inside and outside the packaging box and significantly reducing heat transfer efficiency. Furthermore, the double barrier of the base layer 11 and the aluminum foil layer 12 further reduces heat transfer efficiency.

[0063] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An insulated packaging box, made of a packaging substrate, characterized in that, The packaging substrate is provided with a foaming layer, which is obtained by printing with foaming ink. The packaging substrate is corrugated cardboard, which includes a face paper, a corrugated core paper and a liner paper stacked together. The face paper is gold cardboard or silver cardboard, which includes a base layer and an aluminum foil layer stacked together. The foaming layer is disposed on the side of the aluminum foil layer facing the corrugated core paper.

2. The insulated packaging box according to claim 1, characterized in that, The side of the face paper away from the corrugated core paper also has a printed graphic layer.

3. The insulated packaging box according to claim 2, characterized in that, A protective layer is provided above the printed graphic layer.

4. The insulated packaging box according to claim 1, characterized in that, The thickness of the foamed layer is 0.1mm-5mm.

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