Aluminum foil lunch box with inner lining isolation structure

Abstract

The utility model provides a kind of aluminium foil lunch box with inner lining isolation structure, it includes heat-conducting bearing shell, isolation support pad lining and adapter composite core layer, heat-conducting bearing shell is made of aluminium foil, its edge is bent upwards and is enclosed to form bearing space, and heat conduction is directed to bearing space, isolation support pad lining is made of paper, it is attached to bearing shell inner wall, and support pad space is enclosed in isolation support pad lining inside, adapter composite core layer is made of two-component polyurethane adhesive, it is filled between heat-conducting bearing shell inner wall and isolation support pad lining outer wall, isolation support pad lining and heat-conducting bearing shell are fixedly connected by adapter composite core layer, isolation support pad lining is supported and heat-conducted by heat-conducting bearing shell, food is supported by isolation support pad lining, and it is mutually isolated with heat-conducting bearing shell, avoid harmful substance in heat-conducting bearing shell migration to food.

Description

Technical Field

[0001] This utility model relates to packaging products, and more particularly to an aluminum foil lunch box with an inner lining isolation structure. Background Technology

[0002] Aluminum foil food containers are catering containers made primarily of aluminum foil. Aluminum foil is a thin sheet made from rolled aluminum, which is lightweight, has good sealing and covering properties, and can effectively block the intrusion of light, oxygen, moisture and microorganisms, thereby extending the shelf life of food.

[0003] A conventional aluminum foil lunch box, such as the one disclosed in patent document CN209610181U, includes an aluminum foil lunch box body. The side walls and bottom of the aluminum foil lunch box body are formed with multiple raised ridges to enhance strength. The side wall raised ridges are formed along the height direction of the aluminum foil lunch box body, and the bottom raised ridges are polygonal structures. A primary bend is formed in the upper part of the side wall of the aluminum foil lunch box body, and a secondary bend is formed in the lower part of the primary bend. By adding a secondary bend to the upper side wall of the aluminum foil lunch box where the strength is relatively weak, the overall strength of the aluminum foil lunch box is increased.

[0004] However, these conventional aluminum foil food containers use a single aluminum foil structure. When the aluminum foil comes into direct contact with acidic, alkaline, or high-salt foods, aluminum may dissolve and migrate into the food. Long-term excessive intake of aluminum may accumulate in the body, adversely affecting the nervous system and bones, such as impacting children's intellectual development and increasing the risk of osteoporosis in adults. Some inferior aluminum foil raw materials contain harmful non-food-grade chemicals added during processing, such as metallurgical additives and rolling lubricants that do not meet food safety standards. These residues cannot be removed during the subsequent aluminum foil container manufacturing process and may transfer to food upon contact, posing a health hazard. Furthermore, aluminum foil itself lacks anti-stick and oil-control properties. Certain high-oil foods (such as fried foods, baked goods, and roasted meats) tend to stick together, and excess oil cannot be absorbed, contaminating the food and affecting the consumer experience. Therefore, it is necessary to optimize the structure of these aluminum foil food containers to overcome these shortcomings. Utility Model Content

[0005] The purpose of this invention is to provide an aluminum foil lunch box with an inner lining isolation structure, which solves the problems of aluminum migration risk, surface stains, and insufficient oil and stick resistance of existing aluminum foil containers.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] An aluminum foil lunch box with an inner lining and insulating structure, comprising:

[0008] The heat-conducting load-bearing shell is made of aluminum foil, with its edges bent upwards to form a load-bearing space and conduct heat into the load-bearing space.

[0009] The isolation support liner is made of paper and is attached to the inner wall of the load-bearing shell. It forms a support space inside the isolation support liner. The heat-conducting load-bearing shell supports and conducts heat to the isolation support liner. The isolation support liner supports the food and isolates it from the heat-conducting load-bearing shell, preventing harmful substances in the heat-conducting load-bearing shell from migrating into the food.

[0010] It also includes:

[0011] The transition composite core layer is composed of a two-component polyurethane adhesive and is filled between the inner wall of the thermally conductive load-bearing shell and the outer wall of the isolation support liner. The transition composite core layer fixes the isolation support liner and the thermally conductive load-bearing shell together.

[0012] In one embodiment of this utility model, the heat-conducting bearing shell is made of aluminum foil with a thickness of 20 to 150 micrometers, which has good thermal conductivity and load-bearing strength, and is suitable for various heating methods such as microwave, oven, and open flame cooking.

[0013] In one embodiment of this utility model, the inner lining of the isolation support pad is made of 30GSM food-grade silicone paper, which has excellent oil-proof, water-proof and non-stick properties, and can effectively prevent food from directly contacting aluminum foil and reduce the migration of harmful substances.

[0014] In one embodiment of this utility model, the side of the heat-conducting bearing shell is provided with reinforcing folds. Several reinforcing folds are provided, each extending vertically and arranged sequentially along the circumference of the heat-conducting bearing shell. The reinforcing folds structurally strengthen the side of the heat-conducting bearing shell and increase the bonding strength between the inner lining of the isolation support pad and the side of the heat-conducting bearing shell.

[0015] In one embodiment of this utility model, the bottom of the heat-conducting bearing shell is provided with a bottom texture recess and a bottom texture protrusion. Several bottom texture recesses and bottom texture protrusions are provided and arranged at intervals. Each bottom texture recess is recessed to the lower part of the heat-conducting bearing shell, and each bottom texture protrudes to the upper part of the heat-conducting bearing shell. The bottom texture recesses and bottom texture protrusions make the bottom plane of the heat-conducting bearing shell tight, providing better structural strength.

[0016] In one embodiment of this utility model, the top edge of the heat-conducting bearing shell is rolled outward to form a reinforcing rib, and the top edge of the isolation pad liner is rolled into the reinforcing rib. The reinforcing rib strengthens the top edge of the heat-conducting bearing shell and positions the top edge of the isolation pad liner, while preventing the sharp edge of the aluminum foil from causing injury to the user.

[0017] The advantages of this utility model are:

[0018] The outer heat-conducting shell of this aluminum foil food container is made of aluminum foil. The inner wall of the outer shell is fixed with a two-component polyurethane adhesive to form an insulating support liner. The insulating support liner is made of silicone paper. Aluminum foil is a recyclable material, and silicone paper is a biodegradable material. Compared with plastic-coated paper containers, they are easier to recycle and reuse, and also easier to degrade. Silicone paper can withstand temperatures above 220℃. Aluminum foil has uniform heat conduction and is suitable for various heating scenarios such as microwave, oven, and open flame cooking. The silicone paper layer can effectively absorb oil and moisture, keeping food dry and clean. When baking or cooking food, it is not easy for it to stick to the container surface, improving the user experience. It avoids the problem of aluminum foil oxidizing and turning black or yellow during food heating, improving the user experience. The silicone paper layer blocks direct contact between aluminum foil and food, significantly reducing the risk of aluminum migration and completely controlling the impact of contaminants on the aluminum foil surface on food health. It is especially suitable for packaging applications with high hydrochloric acid or high temperature heating. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the aluminum foil lunch box with an inner lining isolation structure proposed in this utility model. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0021] like Figure 1 As shown, the aluminum foil lunch box with an inner lining isolation structure proposed in this utility model includes a heat-conducting and bearing outer shell 100 and an isolation support liner 200. The heat-conducting and bearing outer shell is made of aluminum foil, and its edges are bent upward to form a bearing space and conduct heat into the bearing space. The isolation support liner is made of paper, which is attached to the inner wall of the bearing outer shell and forms a support space inside the isolation support liner. The heat-conducting and bearing outer shell supports and conducts heat to the isolation support liner, and the isolation support liner supports the food and isolates it from the heat-conducting and bearing outer shell to prevent harmful substances in the heat-conducting and bearing outer shell from migrating into the food.

[0022] The aluminum foil lunch box also includes a transition composite core layer (not shown in the figure). This core layer is composed of a two-component polyurethane adhesive and is filled between the inner wall of the heat-conducting load-bearing outer shell and the outer wall of the insulating support liner. The transition composite core layer securely bonds the insulating support liner to the heat-conducting load-bearing outer shell. In this embodiment, the two-component polyurethane adhesive is formed by mixing component A (a prepolymer containing isocyanate groups) and component B (a polyol containing hydroxyl groups) through a chemical reaction (cross-linking curing). This two-component polyurethane adhesive is VOC-free (volatile organic compounds), completely free of solvents such as toluene and ethyl acetate, and is environmentally friendly and safe, meeting food contact material standards (such as GB 9685 and FDA 21CFR 175.105). It has a solid content close to 100%, requires a small dosage (typically 3–5 g / m²), and exhibits high bonding strength (peel strength ≥3 N / 15 mm). It needs to be cured at room temperature or low temperature (30–50°C) for 24–48 hours, relying on moisture to promote the reaction.

[0023] In this embodiment, the heat-conducting bearing shell is made of aluminum foil with a thickness of 20 to 150 micrometers, which has good thermal conductivity and load-bearing strength, and is suitable for various heating methods such as microwave, oven, and open flame cooking.

[0024] In this embodiment, the inner lining of the isolation support pad is made of 30GSM food-grade silicone paper, which has excellent oil-proof, water-proof, and non-stick properties, effectively preventing food from directly contacting the aluminum foil and reducing the migration of harmful substances.

[0025] In this embodiment, the side of the heat-conducting load-bearing shell is provided with reinforcing folds 110. Several reinforcing folds are provided, each extending vertically and arranged sequentially along the circumference of the heat-conducting load-bearing shell. The reinforcing folds strengthen the structure of the side of the heat-conducting load-bearing shell and increase the bonding strength between the inner lining of the isolation support pad and the side of the heat-conducting load-bearing shell.

[0026] In this embodiment, the bottom of the heat-conducting bearing shell is provided with a bottom texture recess 120 and a bottom texture protrusion 130. Several bottom texture recesses and bottom texture protrusions are provided and arranged at intervals. Each bottom texture recess is recessed to the lower part of the heat-conducting bearing shell, and each bottom texture protrudes to the upper part of the heat-conducting bearing shell. The bottom texture recesses and bottom texture protrusions make the bottom plane of the heat-conducting bearing shell tight, providing better structural strength.

[0027] In this embodiment, the top edge of the heat-conducting bearing shell is rolled outward to form a reinforcing rib 140 with a circular cross-section. The top edge of the isolation pad liner is rolled into the reinforcing rib. The reinforcing rib strengthens the top edge of the heat-conducting bearing shell and positions the top edge of the isolation pad liner, while preventing the sharp edge of the aluminum foil from causing injury to the user.

[0028] The production process of this aluminum foil lunchbox employs a single-sided aluminum foil oiling and cold stamping one-time molding process. This ensures that the insulating support liner tightly adheres to the inner wall of the heat-conducting and load-bearing outer shell, resulting in energy saving, environmental protection, and zero waste discharge. The production speed is stable at 50-60 times / minute, making it suitable for large-scale industrial production. It is important to note that because silicone paper has oil absorption and control functions, the aluminum foil surface needs to be coated with lubricating oil during the forming process to prevent tearing and cracking. Furthermore, since silicone paper has almost no tensile properties and low elongation, while aluminum foil reaches 15%, a more precise surface finishing and wear-resistant treatment is required inside the mold cavity to prevent the silicone paper from tearing and causing defects such as cracking in the formed paper.

[0029] In the description of this utility model, it should be noted that when terms such as "upper," "lower," "inner," "outer," "left," and "right" appear to indicate orientation or positional relationships, they should be understood as being based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product of this utility model is in use, or the orientation or positional relationships commonly understood by those skilled in the art. These terms are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, when terms such as "first" and "second" appear, they are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, it should also be noted that unless otherwise explicitly specified and limited, terms such as "installation," "setting," and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

Claims

1. An aluminum foil lunch box with an inner lining isolation structure, characterized in that, include: The heat-conducting load-bearing shell is made of aluminum foil, with its edges bent upwards to form a load-bearing space and conduct heat into the load-bearing space. The isolation support liner is made of paper and is attached to the inner wall of the load-bearing shell. It forms a support space inside the isolation support liner. The heat-conducting load-bearing shell supports and conducts heat to the isolation support liner. The isolation support liner supports the food and isolates it from the heat-conducting load-bearing shell, preventing harmful substances in the heat-conducting load-bearing shell from migrating into the food.

2. The aluminum foil lunch box with an inner lining isolation structure according to claim 1, characterized in that, Also includes: The transition composite core layer is composed of a two-component polyurethane adhesive and is filled between the inner wall of the thermally conductive load-bearing shell and the outer wall of the isolation support liner. The transition composite core layer fixes the isolation support liner and the thermally conductive load-bearing shell together.

3. The aluminum foil lunch box with an inner lining isolation structure according to claim 1, characterized in that: The heat-conducting outer shell is made of aluminum foil with a thickness of 20 to 150 micrometers.

4. The aluminum foil lunch box with an inner lining isolation structure according to claim 1, characterized in that: The inner lining of the isolation support pad is made of 30GSM food-grade silicone paper.

5. An aluminum foil lunch box with an inner lining isolation structure according to claim 1, characterized in that: The side of the heat-conducting bearing shell is provided with reinforcing folds, which are provided in several lines. Each reinforcing fold extends vertically and is arranged sequentially along the circumference of the heat-conducting bearing shell.

6. The aluminum foil lunch box with an inner lining isolation structure according to claim 1, characterized in that: The bottom of the heat-conducting bearing shell is provided with a recessed pattern and a raised pattern. Several recessed patterns and raised patterns are provided and arranged at intervals. Each recessed pattern is recessed to the lower part of the heat-conducting bearing shell, and each raised pattern is protruding to the upper part of the heat-conducting bearing shell.

7. The aluminum foil lunch box with an inner lining isolation structure according to claim 1, characterized in that: The top edge of the heat-conducting load-bearing outer shell is rolled outward to form a reinforcing rib, and the top edge of the isolation support liner is rolled into the reinforcing rib.

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