High-airtightness food container

Abstract

A high-airtightness food container (10), comprising a container body (11), wherein the container body (11) is formed by folding sheet paper material, and has an open upper end. The container body (11) has a bottom wall (12) and peripheral walls (21, 22, 23, 24, 25, 26, 27, 28) adjacent to the bottom wall (12); at least one seam line is formed on the bottom wall (12) or the peripheral walls (21, 22, 23, 24, 25, 26, 27, 28); the seam line is located at a seam formed by the lamination of at least two layers of sheet paper material; and an edge seam position is formed at the outer edge end of the seam line. A partial area of the bottom wall (12) and / or the peripheral walls (21, 22, 23, 24, 25, 26, 27, 28) of the container body (11) is covered with airtight film layers (60, 62), all edge seam positions are covered with the airtight film layers (60, 62), and at least a partial area of the bottom wall (12) and / or the peripheral walls (21, 22, 23, 24, 25, 26, 27, 28) is not covered with the airtight film layers (60, 62).

Description

High air-tight food container TECHNICAL FIELD

[0001] The present application relates to the technical field of tableware, in particular to a high air-tight food container made of paper. BACKGROUND

[0002] Traditional disposable food containers are mostly made of plastic. Since plastic-made food containers are not easy to degrade and cause plastic pollution, disposable food containers made of environmentally friendly materials such as paper are becoming more and more popular.

[0003] Generally, disposable food containers made of paper are folded from a flat piece of kraft paper or cardboard. The folding forms a seam line, and the seam forms an air flow channel. The gas inside the food container can leak to the outside through the seam, and the gas outside can also flow into the food container through the seam, which results in poor air tightness of the food container.

[0004] In order to solve the problem of air tightness of the food container, it is usually necessary to cover the surface of the food container with an air-tight film layer. A multi-layer composite film is used, and a film layer with a very small thickness is made of PP, PE, PET, PA, EVOH, etc. The air-tight film layer is attached to the inner surface of the food container by traditional vacuum suction molding, especially at the seam, and the seam is sealed by the air-tight film layer to reduce the flow of gas inside and outside the food container.

[0005] However, since the air-tight film layer is made of PP, PE, PET, PA, EVOH, etc., and not made of environmentally friendly materials such as paper, if the thickness of the air-tight film layer is large, it will result in a high plastic content of the food container, for example, the weight of the air-tight film layer accounts for more than 20% of the total weight of the food container, which does not meet the environmental protection requirements. For example, according to the legal requirements of the European Union, if the proportion of plastic in the food container exceeds 10%, the user needs to tear off the air-tight film layer made of plastic from the food container when discarding the food container, and the air-tight film layer and the container body made of paper need to be recycled separately. Obviously, if the weight of the air-tight film layer is large, it not only does not meet the environmental protection requirements, but also brings great inconvenience to the user's use.

[0006] In addition, before the airtight film layer is attached to the inner surface of the food container by using the conventional vacuum suction method, a plastic film with a large area and a large thickness (the thickness is usually more than 0.05 mm) and a certain hardness needs to be heated and softened first, then the softened plastic film is laid on the food container, and finally the softened plastic film is adhered to the food container by the vacuum suction method. However, the above process needs to consume a large amount of energy due to the need of heating the plastic film, and the heating time is long, which increases the production time of the food container and leads to a high production cost of the food container.

[0007] If the proportion of the weight of the airtight film layer in the total weight of the food container is reduced, the thickness of the airtight film layer is usually reduced. However, if the thickness of the airtight film layer is too small, on the one hand, the sealing performance of the airtight film layer will be affected, which leads to poor sealing performance of the food container and is difficult to meet the requirements of food sealing storage; on the other hand, the airtight film layer with a small thickness will bring great difficulty to processing, especially the airtight film layer is difficult to be formed, or it is difficult to perfectly cover the airtight film layer with a small thickness on the surface of the food container, and the airtight film layer is prone to be damaged during processing. If the airtight film layer is damaged during processing, the sealing performance of the food container will be affected. TECHNICAL PROBLEM

[0008] The purpose of the present application is to provide a high airtight food container with good sealing performance and a very low proportion of the weight of the airtight film layer. SOLUTION

[0009] To achieve the purpose of the present application, the high airtight food container provided by the present application comprises a container body, the container body is folded from a sheet paper, and the upper end of the container body is open, the container body has a bottom wall and a peripheral wall adjacent to the bottom wall, at least one seam line is formed on the bottom wall or the peripheral wall, the seam line is located at a seam formed by the superposition of at least two sheet papers, and the outer end of the seam line forms an edge seam position; wherein a part of the bottom wall and / or the peripheral wall of the container body is covered with an airtight film layer, all edge seam positions are covered with the airtight film layer, and at least a part of the bottom wall and / or the peripheral wall is not covered with the airtight film layer.

[0010] A preferred scheme is that the bottom wall is formed by a sheet of sheet paper, and the edge seam position is only formed on the peripheral wall; the area of the bottom wall covered with the airtight film layer is not more than 10% to 50% of the area of the bottom wall.

[0011] A further scheme is that the weight of the airtight film layer accounts for not more than 12% of the total weight of the high airtight food container, preferably, the weight of the airtight film layer accounts for not more than 5% of the total weight of the high airtight food container.

[0012] Further, the peripheral wall is formed with a flange portion near the open end, the flange portion is formed on the upper edge of the peripheral wall, and the flange portion is covered with the air-tight film layer.

[0013] Further, the flange portion is further provided with a folded edge portion away from the peripheral wall, and a free end of the folded edge portion extends towards the bottom wall.

[0014] Further, the air-tight film layer is a plastic film, a degradable film or a degradable coating layer tightly attached to the bottom wall and / or the peripheral wall.

[0015] The application further provides another high-air-tight food container, which comprises a container body, the container body is folded from a sheet paper, and the container body is open at the upper end, the container body has a bottom wall and a peripheral wall adjacent to the bottom wall, at least one seam line is formed on the bottom wall or the peripheral wall, the seam line is located at a seam formed by the superposition of at least two layers of sheet paper, and an edge seam position is formed at the outer end of the seam line; and a part of the bottom wall and / or the peripheral wall of the container body is covered with an air-tight film layer, and the weight of the air-tight film layer accounts for no more than 12% of the total weight of the high-air-tight food container.

[0016] Further, the air-tight film layer is a plastic film, a degradable film or a degradable coating layer tightly attached to the bottom wall and / or the peripheral wall. Advantages

[0017] According to the first food container provided by the application, the bottom wall and / or the peripheral wall of the food container is covered with an air-tight film layer, the edge seam position is sealed by the air-tight film layer, so that the air leakage at the edge seam position of the food container is prevented, and the air-tightness of the food container is effectively improved. In addition, since the air-tight film layer is not covered on all areas of the bottom wall and / or the peripheral wall of the food container, that is, the air-tight film layer is only covered on a part of the bottom wall and / or the peripheral wall and covers all edge seam positions, the covering area of the air-tight film layer on the food container is small, especially for the case that the bottom wall is relatively flat, the small covering area of the air-tight film layer on the bottom wall can reduce the area of the air-tight film layer, thereby reducing the weight of the air-tight film layer, and the weight of the air-tight film layer accounts for a smaller proportion of the total weight of the food container, which meets the environmental protection requirements, and the user does not need to tear off the air-tight film layer after use, which is convenient for the user. The application can meet the air-tightness requirements of the food container under the premise of meeting the environmental protection and recycling requirements, and the user does not need to tear off the air-tight film layer before discarding the food container, which is convenient for the user.

[0018] In addition, since the air-tight film layer covers all the edge joint positions, the air-tightness of the food container can be ensured, and since the area of the air-tight film layer is small, a thicker air-tight film layer can be used under the same weight condition, that is, the use of a very thin air-tight film layer on the food container is avoided, and the thicker air-tight film layer has good sealing performance and can maintain the good air-tightness of the food container.

[0019] Further, since the bottom wall of the food container is formed by a piece of sheet material, that is, no joint line is formed on the bottom wall, the bottom wall itself is not easy to cause gas leakage, so the area of the air-tight film layer covering the bottom wall can be very small, for example, the area of the air-tight film layer is set to be less than 50% of the area of the bottom wall, or even less than 10%, which can effectively reduce the use amount of the air-tight film layer.

[0020] Since the weight of the air-tight film layer accounts for a very low proportion of the total weight of the high-air-tightness food container, especially less than 5%, the plastic content of the food container is very low, and after the food container is used up, the user does not need to tear off the air-tight film layer and discard it, which can facilitate the use of the user.

[0021] The food container forms a flange portion at the upper edge of the peripheral wall, and the air-tight film layer also covers the flange portion, so that the flange portion has high strength, and when the peripheral wall is pressed, the flange portion can provide a large force to the peripheral wall, so that the peripheral wall is not easy to deform, thereby improving the strength of the peripheral wall of the food container.

[0022] Further, a folded edge portion is arranged at the outer end of the peripheral wall of the flange portion, and the air-tight film layer also covers the folded edge portion, and the strength of the folded edge portion is improved by the air-tight film layer, further improving the strength of the peripheral wall. Moreover, since the folded edge portion is arranged, the degree of torsional deformation of the food container can be reduced, which is beneficial to maintaining the good surface flatness of the flange portion. In the subsequent use of the food container, it may be necessary to buckle a cover film or a paper cover, a plastic cover on the food container, and since the folded edge portion is arranged, the deformation of the flange portion caused by the subsequent buckling of the cover can be avoided. In addition, the arrangement of the folded edge portion can avoid the situation that the flange position causes the flange portion to rebound under different temperature and humidity environments, especially to avoid the situation that the flange portion deforms seriously under a large temperature difference, for example, the rebound angle of the flange portion can be less than 10°, which can avoid the situation that the actual shape of the food container used is inconsistent with the shape after forming due to the rebound of the flange portion.

[0023] The air-tight film layer of the present application can be a plastic film, a degradable film or a degradable coating made of PP, PE, PET, PA, EVOH and the like, which is adsorbed on the surface of the peripheral wall and the bottom wall by a hot pressing process. In this way, a suitable production process can be selected according to the specific shape and material of the food container.

[0024] The second food container provided by the application can seal all the joint lines due to the air-tight film layer covering all the edge joint positions of the food container, avoid air leakage at the edge joint positions and affect the sealing performance of the food container. In addition, since only a part of the circumferential wall and the bottom wall of the food container is covered with the air-tight film layer, the area of the air-tight film layer is small, the weight of the air-tight film layer accounts for no more than 12% of the total weight of the high air-tight food container, the food container can meet the environmental protection requirements, and the user does not need to tear off the air-tight film layer after use and discard it, which is convenient for the user. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 is a structural view of the first perspective of the embodiment of the high air-tight food container of the application.

[0026] Fig. 2 is a structural view of the second perspective of the embodiment of the high air-tight food container of the application.

[0027] Fig. 3 is a structural view of the unfolded kraft paper for manufacturing the embodiment of the high air-tight food container of the application.

[0028] Fig. 4 is an enlarged view of a part of Fig. 3.

[0029] Fig. 5 is a structural view of the third perspective of the embodiment of the high air-tight food container of the application.

[0030] Fig. 6 is a structural view of the fourth perspective of the embodiment of the high air-tight food container of the application.

[0031] Fig. 7 is a sectional view of the embodiment of the high air-tight food container of the application.

[0032] The application will be further described below in combination with the drawings and embodiments. Embodiment of the application

[0033] The high air-tight food container of the application is mainly made of environmentally friendly materials such as paper, for example, the food container has a container body, the container body is folded from a whole piece of kraft paper or cardboard, and an air-tight film layer is covered on the circumferential wall and the bottom wall of the container body, the air-tight film layer can be made of PP, PE, PET, PA or EVOH. The application can ensure the sealing performance of the food container through a special structure, and also can reduce the use amount of the air-tight film layer, thereby reducing the weight of the air-tight film layer accounting for the total weight of the whole food container.

[0034] Referring to Figs. 1 and 2, the food container 10 has a container body 11 which is folded from a whole piece of kraft paper. The kraft paper before folding has a shape as shown in Fig. 3. The container body 11 has a flat bottom wall 12 on which a plurality of peripheral walls are formed. In the embodiment, the container body 11 has eight peripheral walls, which are sequentially arranged in a clockwise direction as shown in Fig. 1, and include peripheral walls 21, 22, 23, 24, 25, 26, 27 and 28. The peripheral wall 21 is adjacent to the peripheral walls 22 and 28, the peripheral wall 22 is adjacent to the peripheral walls 21 and 23, and so on. The lower edge of each of the peripheral walls 21, 22, 23, 24, 25, 26, 27 and 28 is adjacent to the bottom wall 12.

[0035] The container body 11 is an open container at its upper end, i.e. the end of the container body 11 away from the bottom wall 12 is open and does not have a cover member. In use, the user places food into the container body 11 and then seals the open end of the container body 11 with a sealing film or the like. When the user needs to take out the food, the user first needs to tear the sealing film or the like from the open end of the container body 11.

[0036] Referring to Fig. 3, the container body 11 is folded from a whole piece of kraft paper. Preferably, the kraft paper has a waterproof coating on its surface, e.g. a plant fiber waterproof coating on one surface of the kraft paper. The waterproof coating provides the kraft paper with a certain waterproof property.

[0037] The kraft paper has a plurality of folding lines, e.g. a folding line 401 between the bottom wall 12 and the peripheral wall 21. When the user folds the kraft paper along the folding line 401, the bottom wall 12 and the peripheral wall 21 of the container body 11 are formed. Similarly, the peripheral wall 22 of the container body 11 is formed by folding the kraft paper along a folding line 402, and the peripheral wall 23 of the container body 11 is formed by folding the kraft paper along a folding line 403. It can be seen that the bottom wall 12 and each of the peripheral walls 21, 22, 23, 24, 25, 26, 27 and 28 of the container body 11 are formed by folding, and thus the bottom wall 12 and each of the peripheral walls 21, 22, 23, 24, 25, 26, 27 and 28 do not have a joint line. Therefore, the bottom wall 12 has a good sealing property.

[0038] A fold is formed on one corner of the kraft paper 40, and the fold includes a sheet 41 which forms the peripheral wall 26 of the container body 11 after being folded. In addition, a fold sheet 42 and a fold sheet 44 are respectively arranged on two sides of the sheet 41, and a sheet 43 is arranged on one side of the fold sheet 42, and the sheet 43 forms the peripheral wall 27 after being folded. When the kraft paper 40 is folded, the fold sheet 42 will be folded between the sheet 41 and the sheet 43, i.e. on the container body 11 after being folded, and the fold sheet 42 will be clamped between the sheet 41 and the sheet 43, as shown in FIG. 5.

[0039] Thus, a seam is formed at the joint of the sheet 41 and the fold sheet 42, as shown in FIG. 6, and a seam line 31 will be formed between the peripheral wall 26 and the peripheral wall 27, and the seam line 31 is a gap formed by the sheet 41 and the fold sheet 42 after being folded, i.e. a seam line is formed at the joint of two or more paper materials. The seam line 31 extends from the bottom wall 12 to the upper edge of the peripheral wall 27, as shown in FIG. 4, and an opening 49 is formed between the sheet 43 and an adjacent sheet 48, and thus, the position of the seam line 31 close to the opening 49 is a position where air leakage is prone to occur, and this position is the outer end of the seam line 31, i.e. the position close to the edge of the sheet, which is called the edge seam position. Due to the existence of the edge seam position, the air inside the container body 11 can pass through the edge seam position and communicate with the air outside.

[0040] Correspondingly, a seam line 32 is also formed between the peripheral wall 25 and the peripheral wall 26. It can be understood that in the embodiment, a seam line is formed between each two adjacent peripheral walls, and the outer end of the seam line will also form an edge seam position. In addition, all the seam lines are formed on the peripheral walls, and no seam line is formed on the bottom wall 12, and no seam line is formed between each peripheral wall and the bottom wall.

[0041] Due to the air flow between the inside and outside of the container body 11 at the edge seam position, the embodiment needs to cover a gas-tight film layer on the container body 11 to cover all the edge seam positions to ensure the sealing of the food container 10. In the embodiment, the gas-tight film layer is a film which covers a local area of the bottom wall 12 and / or the peripheral wall, for example, the film is a plastic film made of PP, PE, PET, PA or EVOH, or a degradable film, such as a PLA, PBS, PVOH or PCL film, and the gas-tight film layer should use a food-grade film to meet the requirements of food safety.

[0042] As shown in FIG. 2, the air-tight film layers 60, 62 are only attached to a portion of the bottom wall 12, such as the two ends along the length direction of the bottom wall 12. Thus, one end of the air-tight film layer 60 extends to the folding mark between the bottom wall 12 and the peripheral wall 27, and the other end of the air-tight film layer 60 forms an edge 61 on the bottom wall 12. Correspondingly, one end of the air-tight film layer 62 extends to the folding mark between the bottom wall 12 and the peripheral wall 23, and the other end of the air-tight film layer 62 forms an edge 63 on the bottom wall 12. The area between the edge 61 and the edge 63 is not covered by the air-tight film layers, that is, the bottom wall 12 will not be covered by the air-tight film layers in the area between the edge 61 and the edge 63.

[0043] In this way, the air-tight film layers do not cover the entire bottom wall 12, but only cover a portion of the area. Preferably, the area of the bottom wall 12 covered by the air-tight film layers is less than 50% of the area of the bottom wall 12, and further, the area of the bottom wall 12 covered by the air-tight film layers is less than 10% of the area of the bottom wall 12. Since the bottom wall 12 is not provided with a seam line and there is no edge seam position, and the kraft paper 40 itself has good air-tightness, even if a large area of the bottom wall 12 is not covered by the air-tight film layers, it will not affect the overall sealing performance of the food container 10.

[0044] Since all the edge seam positions are formed on the peripheral wall, in this embodiment, the air-tight film layers will cover all the peripheral walls, so as to ensure that all the edge seam positions will be covered by the air-tight film layers, and the good sealing performance of the air-tight film layers is used to avoid air leakage between the inside and outside of the food container 10, and to ensure the sealing performance of the food container 10. Preferably, the weight of the air-tight film layers is less than 12% of the total weight of the food container 10, and further, the weight of the air-tight film layers is less than 5% of the total weight of the food container 10. In this way, the weight of the air-tight film layers is small, on the one hand, it can meet the requirements of environmental protection, and on the other hand, after the food container 10 is used, the user does not need to tear off the air-tight film layers and then throw away the food container 10, which can facilitate the use of the user.

[0045] In order to verify the sealing performance of the food container 10, experiments were conducted on the water vapor transmission rate (WVTR), oxygen transmission rate (OTR), and nitrogen transmission rate (NTR) of this embodiment. The experimental data in Table 1 is the experimental data after the food container is covered with the air-tight film layers and the open end of the food container is covered with the sealing film. The material of the air-tight film layers is PLA, and the thickness is 0.06 mm.

[0046] Table 1: Experimental data of the sealing performance of the food container

[0047] g / m2 2 cc / m2 2 cc / m2 2 cc / m2

[0048] As can be seen from Table 1, the food container using the application has good sealing performance, which can meet the needs of food sealing preservation. After many experiments, the inventors found that when the air-tight film layer is made of PP, PE, PET, PA or EVOH, the water vapor transmission rate is between 0.05 g / m2 2 / day and 30 g / m2 2 / day, the oxygen transmission rate is between 0.05 cc / m2 2 / day and 50000 cc / m2 2 / day, and the nitrogen transmission rate is between 0.5 cc / m2 2 / day and 5000 cc / m2 2 / day.

[0049] In other embodiments, the air-tight film layer can also only cover part of the area of the peripheral wall, rather than covering all of the peripheral wall, which can further reduce the area of the air-tight film layer and make the weight of the air-tight film layer lower. Of course, in order to ensure that the air-tight film layer can effectively seal all the seam lines, the edge of the air-tight film layer needs to be kept a certain distance from the edge-to-edge seam position, for example, the distance between the edge of the air-tight film layer and the edge-to-edge seam position is not less than 5 mm.

[0050] During the use of the food container 10, the user often holds the peripheral wall. Since the peripheral wall made of paper is soft in texture, it is easy to deform severely when the user holds the peripheral wall. If the user holds the peripheral wall with a larger force, it will also cause the peripheral wall to be damaged, resulting in the damage of the entire food container 10 and affecting the use of the food container 10.

[0051] In order to improve the strength of the peripheral wall, a flange portion 51 is arranged at the upper edge of the peripheral wall, as shown in FIG. 7. The flange portion 51 is formed at the position of the peripheral wall 27 close to the open end, that is, at the upper edge of the peripheral wall 27 away from the bottom wall 12. The flange portion 51 extends from the upper edge of the peripheral wall 27 in a direction radially outward of the food container 10, that is, outwardly. As shown in FIG. 3, a flange sheet 46 is arranged at the end of the sheet body 43 away from the bottom wall 12. The flange sheet 46 and the sheet body 43 have a folding mark 406 therebetween. After the flange sheet 46 and the sheet body 43 are folded along the folding mark 406, the flange sheet 46 will form the flange portion 51.

[0052] In the embodiment, the upper edge of each of the peripheral walls is connected with the flange part, and therefore, the flange part is arranged around the upper edge of the whole peripheral wall, i.e. around the open end of the food container 10. Further, the flange part is also covered with the airtight film layer, which is preferably formed on the flange part by hot pressing. In this way, the hardness of the flange part is enhanced by the airtight film layer formed by hot pressing, thereby enhancing the strength of the peripheral wall, and the user is less likely to cause the peripheral wall to collapse or break when holding the peripheral wall.

[0053] In addition, the free end of the flange part 51 is also provided with a folded edge part 52, as shown in Fig. 7. One end of the folded edge part 52 is connected to the flange part 51, and the free end of the folded edge part 52 extends towards the bottom wall 12. In the embodiment, the folded edge part 52 extends substantially perpendicularly to the bottom wall 12. In other embodiments, the folded edge part 52 can also extend obliquely to the bottom wall 12, for example, from the direction close to the flange part 51 to the direction away from the flange part 51, and the folded edge part 52 extends obliquely from the direction close to the peripheral wall 27 to the direction away from the peripheral wall 27. Referring to Fig. 3, the flange sheet 46 is provided with an outward extending sheet 47 at the end away from the sheet body 43. The flange sheet 46 and the outward extending sheet 47 have a folding mark 407 therebetween. After the outward extending sheet 47 is folded along the folding mark 407, the outward extending sheet 47 forms the folded edge part 52.

[0054] In addition, the folded edge part 52 can also be covered with an airtight film layer, which is preferably formed on the folded edge part 52 by hot pressing. The airtight film layer formed by hot pressing can enhance the strength of the folded edge part 52, thereby increasing the deformation resistance of the folded edge part 52. Since the folded edge part 52 is connected to the upper edge of the peripheral wall 27, this design can further enhance the strength of the peripheral wall 27, and the user is less likely to cause the peripheral wall 27 to collapse when holding the peripheral wall 27, so that the food container 10 can maintain the original shape.

[0055] It can be seen that the food container provided by the present application forms the airtight film layer on the partial area of the bottom wall and / or the peripheral wall, instead of forming the airtight film layer on the whole bottom wall and / or the whole peripheral wall, thereby reducing the area of the airtight film layer, and thereby reducing the weight of the airtight film layer in the whole food container. On the one hand, the use amount of the airtight film layer can be reduced, so that the food container is more environmentally friendly. On the other hand, the user can avoid the inconvenience of tearing off the airtight film layer after using the food container, while meeting the requirement of environmental performance.

[0056] Finally, it should be emphasized that the above is only the preferred embodiment of the present application, and is not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. Industrial applicability

[0057] The high-airtight food container provided by the application is used for containing food, can guarantee the airtightness of the food container, and reduces the weight proportion of the airtight film layer, so that the food container is more environmentally friendly and convenient for users to use.

Claims

1. A high-gas-barrier food container, comprising: a container body formed by folding a sheet of paper, the container body having an open upper end, a bottom wall and a peripheral wall adjacent to the bottom wall, at least one seam line formed on the bottom wall or the peripheral wall, the seam line being located at a seam formed by at least two layers of the sheet of paper, and an edge seam position formed at an end of an outer edge of the seam line; characterized in that: a portion of the bottom wall and / or the peripheral wall of the container body is covered with a gas-barrier film layer, all of the edge seam positions are covered with the gas-barrier film layer, and at least a portion of the bottom wall and / or the peripheral wall is not covered with the gas-barrier film layer.

2. The high-gas-barrier food container according to claim 1, characterized in that: the bottom wall is formed by one sheet of the sheet of paper, and the edge seam position is formed only on the peripheral wall; and the area of the bottom wall covered with the gas-barrier film layer is not more than 10% to 50% of the area of the bottom wall.

3. The high-gas-barrier food container according to claim 1 or 2, characterized in that: the weight of the gas-barrier film layer is not more than 12% of the total weight of the high-gas-barrier food container.

4. The high-gas-barrier food container according to claim 3, characterized in that: the weight of the gas-barrier film layer is not more than 5% of the total weight of the high-gas-barrier food container.

5. The high-gas-barrier food container according to claim 1 or 2, characterized in that: a flange portion is formed on the peripheral wall near the open end, the flange portion is formed on an upper edge of the peripheral wall, and the flange portion is covered with the gas-barrier film layer.

6. The high-gas-barrier food container according to claim 5, characterized in that: a hem portion is further provided on an end of the flange portion away from the peripheral wall, and a free end of the hem portion extends toward the bottom wall.

7. The high-gas-barrier food container according to claim 6, characterized in that: the hem portion is covered with the gas-barrier film layer.

8. The high-gas-barrier food container according to claim 1 or 2, characterized in that: the gas-barrier film layer is a plastic film, a degradable film or a degradable coating layer that is tightly attached to the bottom wall and / or the peripheral wall.

9. A high-gas-barrier food container, comprising: a container body formed by folding a sheet of paper, the container body having an open upper end, a bottom wall and a peripheral wall adjacent to the bottom wall, at least one seam line formed on the bottom wall or the peripheral wall, the seam line being located at a seam formed by at least two layers of the sheet of paper, and an edge seam position formed at an end of an outer edge of the seam line; characterized in that: a portion of the bottom wall and / or the peripheral wall of the container body is covered with a gas-barrier film layer, and the weight of the gas-barrier film layer is not more than 12% of the total weight of the high-gas-barrier food container.

10. The high-gas-barrier food container according to claim 9, characterized in that: the gas-barrier film layer is a plastic film, a degradable film or a degradable coating layer that is tightly attached to the bottom wall and / or the peripheral wall. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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