Food packaging box

Abstract

To provide a food packaging box which can prevent an outer surface from becoming hot even if heated in a microwave or the like.SOLUTION: A food packaging box 10 comprises: an almost cylindrical outer wall member 12 which stores a food bag inside; and an inner wall member 22 which is provided between the outer wall member 12 and the food bag and forms gaps G1, G2 with the outer wall member 12 by at least partially separating the outer wall member 12.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a food packaging box. [Background technology]

[0002] 2. Description of the Related Art Food packaging boxes for packaging food bags in which food is sealed are conventionally known.

[0003] In this regard, Patent Document 1 discloses that a user heats a packaging sleeve (food packaging box) containing a plastic film bag (food bag) in a microwave oven or the like, and then holds the outer surface of the box in his or her hand to eat the food in the retort pouch. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2010-222050 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, with the technology of Patent Document 1, heat from the heated plastic film bag is transferred to the outer surface of the food packaging box, and there are cases where the outer surface is too hot for the user to hold.

[0006] The present invention has been made in consideration of such problems, and its purpose is to provide a food packaging box that can prevent the outer surface from becoming hot even when the food bag and box are heated in a microwave oven or the like. [Means for solving the problem]

[0007] In order to solve the above problems, a food packaging box according to a first aspect of the present invention is a food packaging box for packaging a food bag in which food is sealed, and comprises: a roughly cylindrical outer wall member that houses the food bag inside; and an inner wall member provided between the outer wall member and the food bag, at least a portion of the inner wall member facing and spaced apart from the outer wall member to form a gap between the inner wall member and the outer wall member.

[0008] In addition, in a food packaging box according to a second aspect of the present invention, the outer wall member has a flat surface when viewed from the radial outside of the outer wall member and a flat back surface when viewed from the radial outside, and the inner wall member has a first inner wall portion facing the surface of the outer wall member and extending circumferentially of the outer wall member, and a second inner wall portion arranged on the opposite side of the first inner wall portion with respect to the food bag, facing the back surface of the outer wall member and extending circumferentially of the outer wall member.

[0009] In the food packaging box according to the third aspect of the present invention, the circumferential length of the first inner wall portion is different from the circumferential length of the surface of the outer wall member.

[0010] In the food packaging box according to the fourth aspect of the present invention, the circumferential length of the first inner wall portion is shorter than the circumferential length of the surface of the outer wall member.

[0011] In addition, in the food packaging box according to the fifth aspect of the present invention, the circumferential length of one of the first inner wall portion and the second inner wall portion is different from the circumferential length of the other of the first inner wall portion and the second inner wall portion.

[0012] In addition, in the food packaging box according to the sixth aspect of the present invention, the axial length of either the first inner wall portion or the second inner wall portion is different from the axial length of the other inner wall portion of the first inner wall portion or the second inner wall portion.

[0013] In addition, in a food packaging box according to a seventh aspect of the present invention, the inner wall member has a connection portion connecting one axial end of the first inner wall portion and one axial end of the second inner wall portion, the connection portion being exposed from one axial end of the outer wall member, and the connection portion has a first connection portion which is one radial end of the connection portion, a second connection portion which is the other radial end of the connection portion, and a push-in portion which is connected to the first connection portion and the second connection portion and has a slit formed between the first connection portion and the second connection portion and which can be pushed in by a user.

[0014] In addition, in the food packaging box according to the eighth aspect of the present invention, the pushing portion has a pair of abutment plates facing the outer wall member, and the pair of abutment plates are folded when the pushing portion is not pushed in and expand when the pushing portion is pushed in, so that each end of the pair of abutment plates abuts against the inner surface of the outer wall member and maintains the abutting state.

[0015] In the food packaging box according to a ninth aspect of the present invention, the outer wall member is provided with a fold extending in the axial direction of the outer wall member.

[0016] In addition, in the food packaging box according to the tenth aspect of the present invention, a pair of first recesses are provided on the front surface of the outer wall member as the fold lines, and a pair of second recesses are provided on the back surface as the fold lines, parallel to the first recesses.

[0017] In addition, in the food packaging box according to an eleventh aspect of the present invention, when the fold is a first fold, a second fold is provided in the first inner wall portion and / or the second inner wall portion, and the number of the second folds or the positions of the second folds in the first inner wall portion and / or the second inner wall portion are different from the number of the first folds or the positions of the first folds in the opposing outer wall member.

[0018] In addition, in a food packaging box according to a twelfth aspect of the present invention, the food bag has a pressure relief portion configured to allow the food bag to be opened by an increase in internal pressure caused by heating the food, and the gap is formed around the pressure relief portion.

[0019] In addition, in a food packaging box according to a thirteenth aspect of the present invention, the food packaging box is assembled from a single sheet of paper. Effect of the Invention

[0020] According to the present invention, even if the food bag and the box are heated in a microwave oven or the like, the outer surface of the food packaging box can be prevented from becoming hot. [Brief description of the drawings]

[0021] [Figure 1] FIG. 2 is a front view of the food packaging box according to the embodiment. [Diagram 2] FIG. 2 is a rear view of the food packaging box according to the embodiment. [Diagram 3] FIG. 2 is a right side view of the food packaging box according to the embodiment. [Figure 4] FIG. 2 is a diagram showing a state when the food packaging box according to the embodiment is opened. [Diagram 5] FIG. 1 is a diagram showing a user eating food in a retort pouch. [Figure 6] FIG. 2 is a front view of the retort pouch 100. [Figure 7] 4 is a cross-sectional view of the food packaging box shown in FIG. 3 taken along the line AA. [Figure 8] FIG. 2 is a development view of the food packaging box according to the embodiment. [Figure 9] FIG. 2 is a bottom view of the food packaging box according to the embodiment. [Figure 10] 10 is a diagram showing a state after the bottom surface of the food packaging box shown in FIG. 9 is deformed in a state in which a pushing portion of the food packaging box is pushed in. FIG. [Figure 11A] 4A to 4C are diagrams for explaining a first step of the method for assembling the food packaging box according to the present embodiment. [Figure 11B]FIG. 11B is a view for explaining a second step of the assembly method continuing from FIG. 11A. [Figure 11C] FIG. 11C is a diagram illustrating a third step of the assembly method continuing from FIG. 11B. [Figure 11D] FIG. 11D is a diagram illustrating a fourth step of the assembly method continuing from FIG. 11C. [Figure 12] 11 is a diagram showing the state of the right side surface of the food packaging box according to the embodiment after deformation. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, an embodiment of the present invention (hereinafter, sometimes referred to as "the present embodiment") will be described with reference to the attached drawings. In order to facilitate understanding of the description, the same components and steps in each drawing are denoted by the same reference numerals as much as possible, and duplicated descriptions will be omitted.

[0023] <Configuration> First, the configuration of the food packaging box according to this embodiment will be described.

[0024] FIG. 1 is a front view of a food packaging box 10 according to this embodiment.

[0025] As shown in Fig. 1, the food packaging box 10 is for packaging a food bag in which food is sealed, and is formed, for example, in a vertically long, generally envelope shape. In Fig. 1, the longitudinal direction of the food packaging box 10 coincides with the axial direction O of the food packaging box 10. The food packaging box 10 has a generally cylindrical outer wall member 12 that houses the food bag inside.

[0026] The surface 12A of the outer wall member 12 is a flat surface when viewed from the radial outside of the outer wall member 12. The shape of the surface 12A is substantially quadrangular, specifically, substantially rectangular with a long vertical length. The surface 12A is provided with an opening portion 14, a fold 16, and a hook hole 18.

[0027] The opening portion 14 is a portion for opening the food packaging box 10. The opening portion 14 is provided on the entire surface along the circumferential direction in the central portion in the axial O direction of the food packaging box 10. It is preferable that a pair of cut lines 14A, 14B are provided on both ends of the opening portion 14 to facilitate opening by the user.

[0028] The folds 16 extend in the axial O direction on the surface 12A. The number and shape of the folds 16 are not particularly limited, but in this embodiment, a pair of first recesses 16A, 16B extending from one end to the other end in the axial O direction on the surface 12A are formed as the folds 16.

[0029] The hook hole 18 is provided on one end side of the surface 12A in the direction of the axis O. This hook hole 18 is a hole for hanging the food packaging box 10 on a hook (not shown) provided at a store or the like that sells the food packaging box 10.

[0030] FIG. 2 is a rear view of the food packaging box 10 according to this embodiment.

[0031] As shown in Fig. 2, the back surface 12B of the outer wall member 12 is a flat surface when viewed from the radial outside of the outer wall member 12. The shape of the back surface 12B is a substantially quadrangular shape, specifically, a substantially vertically long rectangular shape. A pair of second recesses 16C, 16D are formed as folds 16 on the back surface 12B so as to be parallel to the first recesses 16A, 16B. In addition, an opening portion 14 is provided on the back surface 12B, continuing from the front surface 12A. When the opening portion 14 is peeled off, the food packaging box 10 can be opened.

[0032] FIG. 3 is a right side view of the food packaging box 10 according to this embodiment.

[0033] As shown in Fig. 3, the food packaging box 10 is provided with an opening 20 that communicates with the inside of the food packaging box 10. The opening 20 indicates the portion that the user peels off (opens) first when peeling off the opening portion 14. The user peels off the opening portion 14 by moving the hand in the circumferential direction of the outer wall member 12 while holding the opening portion 14 around the opening 20 with the fingers.

[0034] FIG. 4 is a diagram showing the food packaging box 10 according to this embodiment when it is opened.

[0035] As shown in Fig. 4, when the food packaging box 10 is opened, one end side (the upper end side in Fig. 4) of a retort pouch 100 serving as a food bag contained therein is exposed. A pair of cut lines 102 are provided on one end side of the retort pouch 100. Food such as rice or curry is sealed in the retort pouch 100. In order to eat this food, a user heats the food packaging box 10 in a microwave oven or the like before opening the food packaging box 10. The user then opens the food packaging box 10 and also opens the retort pouch 100 at the cut lines 102.

[0036] FIG. 5 is a diagram showing a user eating the food in the retort pouch 100. As shown in FIG.

[0037] As shown in FIG. 5, a user holds the outer wall member 12 of the food packaging box 10 remaining after the opening in his / her hand and eats the food in the opened retort pouch 100.

[0038] FIG. 6 is a front view of the retort pouch 100.

[0039] As shown in Fig. 6, the retort pouch 100 is, for example, a substantially rectangular parallelepiped. A pressure relief section 104 is provided on the other end side of the retort pouch 100, i.e., on the opposite side to where the pair of score lines 102 are provided. The pressure relief section 104 is configured so that the retort pouch 100 can be opened by an increase in internal pressure caused by heating the food. Specifically, the pressure relief section 104 is formed in a convex shape from one end in the short side direction of the retort pouch 100 toward the center of the retort pouch 100 where the food is sealed, and is configured so that the internal pressure caused by heating the food is more likely to be applied to the pressure relief section 104 than to other portions. A steam vent 106 is formed in the center of the pressure relief section 104. The steam vent 106 penetrates the retort pouch 100 from the front surface to the back surface. When the retort pouch 100 expands due to the heating of food and internal pressure is applied to the pressure relief section 104, the steam vent 106 opens to the inside of the retort pouch 100. Then, steam generated inside is exhausted to the outside through the steam vent 106.

[0040] Returning to Figure 4, when such a retort pouch 100 is contained in the outer wall member 12, the pair of cut lines 102 of the retort pouch 100 are located at one end side (upper end side) of the outer wall member 12 in the axial O direction, and the pressure relief portion 104 of the retort pouch 100 is located at the other end side (lower end side) of the outer wall member 12 in the axial O direction.

[0041] Fig. 7 is a cross-sectional view taken along the line AA of the food packaging box 10 shown in Fig. 3. Fig. 8 is a development view of the food packaging box 10 according to this embodiment.

[0042] As shown in FIG. 7, an inner wall member 22 is provided inside the outer wall member 12 of the food packaging box 10. This inner wall member 22 is provided between the outer wall member 12 and the retort pouch 100 containing the food 110, and sandwiches the retort pouch 100. At least a portion of the inner wall member 22 faces the outer wall member 12 at a distance, forming gaps G1 and G2 between the inner wall member 22 and the outer wall member 12. These gaps G1 and G2 continue to the other end side (lower end side) in the axial O direction (see FIG. 9) and communicate with the outside. In addition, since the pressure relief portion 104 of the retort pouch 100 is also located on the other end side in the axial O direction of the outer wall member 12, the gaps G1 and G2 are also present around the pressure relief portion 104, and the steam port 106 of the pressure relief portion 104 communicates with the outside via these gaps G1 and G2.

[0043] The inner wall member 22 has a first inner wall portion 22A and a second inner wall portion 22B.

[0044] The first inner wall portion 22A faces the surface 12A of the outer wall member 12 and extends in the circumferential direction of the outer wall member 12 so as to cover the surface of the retort pouch 100. The first inner wall portion 22A is provided with a fold 24, such as a slit along the axis O direction. The fold 24 faces the first recess 16A. The circumferential length of the first inner wall portion 22A is different from the circumferential length of the surface 12A of the outer wall member 12. In this embodiment, as shown in FIG. 8, the circumferential length L1 of the first inner wall portion 22A is shorter than the circumferential length L2 of the surface 12A of the outer wall member 12.

[0045] Returning to Fig. 7, the second inner wall portion 22B is disposed on the opposite side of the first inner wall portion 22A with respect to the retort pouch 100, faces the back surface 12B of the outer wall member 12, and extends in the circumferential direction of the outer wall member 12 so as to cover the back surface of the retort pouch 100. The circumferential length of the second inner wall portion 22B is different from the circumferential length of the back surface 12B of the outer wall member 12. In this embodiment, as shown in Fig. 8, the circumferential length L3 of the second inner wall portion 22B is shorter than the circumferential length L4 of the back surface 12B of the outer wall member 12.

[0046] Further, the circumferential length of either the first inner wall portion 22A or the second inner wall portion 22B may be different from the circumferential length of the other inner wall portion of the first inner wall portion 22A or the second inner wall portion 22B. As shown in Fig. 8, in this embodiment, the circumferential length L3 of the second inner wall portion 22B is shorter than the circumferential length L1 of the first inner wall portion 22A.

[0047] Furthermore, the length in the axial O direction of one of the first inner wall portion 22A and the second inner wall portion 22B may be different from the length in the axial O direction of the other of the first inner wall portion 22A and the second inner wall portion 22B. In this embodiment, as shown in Fig. 8, the length L5 in the axial O direction of the second inner wall portion 22B is shorter than the length L6 in the axial O direction of the first inner wall portion 22A.

[0048] Returning to Fig. 7, similarly to the first inner wall portion 22A, the second inner wall portion 22B may also have folds 24. However, it is preferable that the number of folds 24 or the positions of the folds 24 in the first inner wall portion 22A and / or the second inner wall portion 22B differ from the number of folds 16 or the positions of the folds 16 in the opposing outer wall member 12. In this embodiment, the number of folds 16 on the front surface 12A of the outer wall member 12 is two, the number of folds 16 on the back surface 12B of the outer wall member 12 is two, the number of folds 24 in the first inner wall portion 22A is one, and the number of folds 24 in the second inner wall portion 22B is zero.

[0049] Further, the shape of either the first inner wall portion 22A or the second inner wall portion 22B may be different from the shape of the other inner wall portion of the first inner wall portion 22A or the second inner wall portion 22B. In this embodiment, as shown in Fig. 8, the shape of the first inner wall portion 22A is substantially rectangular, and the shape of the second inner wall portion 22B is convex.

[0050] FIG. 9 is a bottom view of the food packaging box 10 according to this embodiment.

[0051] 8 and 9, the inner wall member 22 has a connection portion 22C exposed on the bottom side of the food packaging box 10. This connection portion 22C connects the other end (lower end) in the axial O direction of the first inner wall portion 22A and the other end (lower end) in the axial O direction of the second inner wall portion 22B. The connection portion 22C is exposed from the other end (lower end) in the axial O direction of the outer wall member 12, and has a first connection portion 30, a second connection portion 32, and a push-in portion 34.

[0052] 9, the first connection portion 30 is one radial end portion of the connection portion 22C. A slit 30A is formed along the radial direction in the center of the first connection portion 30. In addition, the above-mentioned gaps G1 and G2 are exposed between the first connection portion 30 and the outer wall member 12.

[0053] The second connection portion 32 is the other radial end portion of the connection portion 22C. A slit 32A is formed along the radial direction in the center of the second connection portion 32. In addition, the above-mentioned gaps G1 and G2 are not exposed between the second connection portion 32 and the outer wall member 12, but the gaps G1 and G2 may be exposed.

[0054] The pushing portion 34 is provided between the first connecting portion 30 and the second connecting portion 32, and is connected to the first connecting portion 30 and the second connecting portion 32. In addition, the pushing portion 34 has a slit 38 formed between the first connecting portion 30 and the second connecting portion 32, so that the user can push it in. In addition, a slit 34A is formed in the center of the pushing portion 34 along the radial direction. Such a pushing portion 34 has a pair of abutment plates 36 facing the outer wall member 12. The pair of abutment plates 36 are folded inward in the axial O direction of the outer wall member 12 when the pushing portion 34 is not pushed in.

[0055] FIG. 10 is a diagram showing the state of the bottom surface of the food packaging box 10 after deformation in a state in which the push-in portion 34 of the food packaging box 10 shown in FIG. 9 is pushed in. As shown in FIG.

[0056] 10, when the pushing-in portion 34 is in a pushed-in state, the pair of abutment plates 36 spread out, and each end of the pair of abutment plates 36 spreads out and abuts against the inner surface of the outer wall member 12, and the abutment state is maintained. As a result, the gaps G1, G2 between the outer wall member 12 and the inner wall member 22 also spread out and the spread is maintained. In addition, when the pushing-in portion 34 is in a pushed-in state, the first connecting portion 30 and the second connecting portion 32 also spread out, so that the spread of the pair of abutment plates 36 is easily maintained.

[0057] 8, a slit 40A is formed between the connection portion 22C and the first inner wall portion 22A. In addition, a slit 40B is formed between the connection portion 22C and the second inner wall portion 22B. As a result, when the push-in portion 34 is in a pushed-in state, each end of the pair of abutment plates 36 comes into contact with the inner surface of the outer wall member 12.

[0058] <Assembly Instructions> As shown in Fig. 8, the food packaging box 10 according to this embodiment is assembled from a single sheet of paper 200. A specific assembly method will be described with reference to Fig. 8 and Figs. 11A to 11D.

[0059] Fig. 11A is a diagram for explaining a first step of the assembling method of the food packaging box 10 according to the present embodiment. Fig. 11B is a diagram for explaining a second step of the assembling method continued from Fig. 11A. Fig. 11C is a diagram for explaining a third step of the assembling method continued from Fig. 11B. Fig. 11D is a diagram for explaining a fourth step of the assembling method continued from Fig. 11C.

[0060] (First step) 8 and 11A, the manufacturer executes a first step of folding the second inner wall portion 22B toward the first inner wall portion 22A around the center of the connection portion 22C. At this time, the manufacturer applies adhesive 200A to a part of the back surface 12B of the exterior wall member 12. At the same time, the manufacturer may also apply adhesive 200B to one end portion in the short side direction of the front surface 12A of the exterior wall member 12.

[0061] (Second step) Next, as shown in Figures 11A and 11B, the manufacturer performs a second step of folding the inner wall member 22 toward the back surface 12B of the outer wall member 12 and partially bonding the second inner wall portion 22B and the outer wall member 12 with adhesive 200A.

[0062] (Third step) Next, as shown in FIGS. 11B and 11C, the manufacturer performs a third step of folding the outer wall member 12 towards the inner wall member 22 and bonding a part of the outer wall member 12 and the first inner wall portion 22A together via the adhesive 200B.

[0063] (Fourth step) Next, as shown in Figures 11B and 11D, the manufacturer performs a fourth step of folding the cover member 202 so as to close the upper end side of the outer wall member 12, and then folding the stopper portion 204 and adhering it to the cover member 202.

[0064] By carrying out the above-mentioned first to fourth steps, the food packaging box 10 is assembled from one sheet of paper 200.

[0065] <Effects> As described above, the food packaging box 10 according to this embodiment is a food packaging box 10 for packaging a retort pouch 100 in which a food is sealed, and comprises an approximately cylindrical outer wall member 12 that houses the retort pouch 100 inside, and an inner wall member 22 that is provided between the outer wall member 12 and the retort pouch 100, and at least a portion of the inner wall member 22 is spaced apart and faces the outer wall member 12, thereby forming gaps G1, G2 between the inner wall member 22 and the outer wall member 12.

[0066] According to this configuration, even if the retort pouch 100 in the food packaging box 10 is heated in a microwave oven or the like, the heat of the heated retort pouch 100 is transferred in the order of the inner wall member 22, the gaps G1 and G2, and the outer wall member 12. Here, by passing through the gaps G1 and G2 before being transferred to the outer wall member 12, the heat from the retort pouch 100 can be prevented from being transferred to the outer wall member 12, so that the outer wall member 12 of the food packaging box 10, i.e., the outer surface of the food packaging box 10 can be prevented from becoming hot. As a result, as shown in FIG. 5, a user can hold the outer wall member 12 of the food packaging box 10 in his / her hand and eat the food in the retort pouch 100 without worrying about the heat.

[0067] In addition, in the food packaging box 10 of this embodiment, the outer wall member 12 has a flat surface 12A when viewed from the radial outside of the outer wall member 12, and a flat back surface 12B when viewed from the radial outside, and the inner wall member 22 has a first inner wall portion 22A that faces the surface 12A of the outer wall member 12 and extends in the circumferential direction of the outer wall member 12, and a second inner wall portion 22B that is arranged on the opposite side of the first inner wall portion 22A with respect to the retort pouch 100, faces the back surface 12B of the outer wall member 12, and extends in the circumferential direction of the outer wall member 12.

[0068] According to this configuration, the retort pouch 100 is sandwiched between the first inner wall portion 22A facing the front surface 12A of the outer wall member 12 and the second inner wall portion 22B facing the back surface 12B of the outer wall member 12, so that it is possible to block the transfer of heat from the retort pouch 100 to both the front surface 12A and the back surface 12B of the outer wall member 12. Therefore, it is possible to further prevent the outer surface of the food packaging box 10 from becoming hot.

[0069] In the food packing box 10 according to this embodiment, the length L1 of the first inner wall portion 22A in the circumferential direction is different from the length L2 of the surface 12A of the outer wall member 12 in the circumferential direction.

[0070] According to this configuration, the gap G1 is easily formed, so that the outer surface of the food packaging box 10 can be further prevented from becoming hot.

[0071] FIG. 12 is a diagram showing the right side surface of the food packaging box 10 according to this embodiment after deformation.

[0072] As shown in FIG. 12, when the food packaging box 10 is heated, the retort pouch 100 expands, and as a result, the food packaging box 10 also expands in the radial direction. When the food packaging box 10 is heated and expands in the radial direction, if the circumferential length L1 of the first inner wall portion 22A is different from the circumferential length L2 of the surface 12A of the outer wall member 12, the way in which the first inner wall portion 22A expands and the way in which the outer wall member 12 expands are different. Due to this difference in the way in which they expand, the curvature of the first inner wall portion 22A and the curvature of the outer wall member 12 become different, and the gap G1 can be made larger. When the food packaging box 10 expands in the radial direction, the opening 20 also deforms, and the deformed state is maintained to a certain extent, which leads to an appearance of incongruity, making it easy to notice that the food packaging box 10 is "not unused."

[0073] In the food packing box 10 according to this embodiment, the length L1 of the first inner wall portion 22A in the circumferential direction is shorter than the length L2 of the surface 12A of the outer wall member 12 in the circumferential direction.

[0074] According to this configuration, the gap G1 can be made larger, and the outer surface of the food packaging box 10 can be further prevented from becoming hot.

[0075] In addition, in the food packaging box 10 of this embodiment, the circumferential length of either the first inner wall portion 22A or the second inner wall portion 22B is different from the circumferential length of the other inner wall portion of the first inner wall portion 22A or the second inner wall portion 22B.

[0076] 7, this configuration allows a gap to be formed between one circumferential end of the first inner wall portion 22A and one circumferential end of the second inner wall portion 22B, and allows steam from the heated retort pouch 100 to escape to the outside through the gap. This prevents steam from being trapped inside the food packaging box 10, and further prevents the outer surface of the food packaging box 10 from becoming hot.

[0077] In addition, in the food packaging box 10 of this embodiment, the length in the axial O direction of either the first inner wall portion 22A or the second inner wall portion 22B is different from the length in the axial O direction of the other inner wall portion of the first inner wall portion 22A or the second inner wall portion 22B.

[0078] This configuration makes it easier for the manufacturer to insert the retort pouch 100 between the first inner wall portion 22A and the second inner wall portion 22B.

[0079] In addition, in the food packaging box 10 of this embodiment, the inner wall member 22 has a connection portion 22C connecting the lower end portion in the axial O direction of the first inner wall portion 22A and the lower end portion in the axial O direction of the second inner wall portion 22B, and the connection portion 22C is exposed from the other end (lower end) in the axial O direction of the outer wall member 12, and has a first connection portion 30 which is one radial end portion of the connection portion 22C, a second connection portion 32 which is the other radial end portion of the connection portion 22C, and a push-in portion 34 which is connected to the first connection portion 30 and the second connection portion 32, and has a slit 38 formed between the first connection portion 30 and the second connection portion 32 and which can be pushed in by a user.

[0080] According to this configuration, as shown in Fig. 10, the user can press the pushing portion 34 to enlarge the gaps G1 and G2, and then heat the food packaging box 10 in a microwave oven. As a result, steam coming out of the retort pouch 100 in the heated food packaging box 10 can be released to the outside through the gaps G1 and G2, so that steam is not trapped inside the food packaging box 10, and the outer surface of the food packaging box 10 can be further prevented from heating up.

[0081] In addition, in the food packaging box 10 according to this embodiment, the pushing-in portion 34 has a pair of abutment plates 36 facing the outer wall member 12, and the pair of abutment plates 36 are folded when the pushing-in portion 34 is not pushed in, and when the pushing-in portion 34 is pushed in, the pair of abutment plates 36 expand so that each end of the expanded pair of abutment plates 36 abuts against the inner surface of the outer wall member 12, and the abutting state is maintained.

[0082] According to this configuration, the gaps G1 and G2 can be maintained large even after the food packaging box 10 is heated in a microwave oven. As a result, even while the user is eating the food 110, steam coming out of the retort pouch 100 in the heated food packaging box 10 can escape to the outside through the gaps G1 and G2, so that steam does not become trapped inside the food packaging box 10 and the outer surface of the food packaging box 10 can be further prevented from heating up.

[0083] In the food packaging box 10 according to this embodiment, the outer wall member 12 is provided with a fold 16 extending in the axial O direction.

[0084] According to this configuration, the folds 16 make the outer wall member 12 more susceptible to deformation. As a result, a difference occurs between the degree of deformation of the outer wall member 12 and the degree of deformation of the inner wall member 22 when heated, and therefore the gaps G1, G2 between the outer wall member 12 and the inner wall member 22 become larger, which further prevents the outer surface of the food packaging box 10 from becoming hot.

[0085] In addition, in the food packaging box 10 of this embodiment, a pair of first recesses 16A, 16B as folds 16 are provided on the front surface 12A of the outer wall member 12, and a pair of second recesses 16C, 16D as folds 16 are provided on the back surface 12B parallel to the first recesses 16A, 16B.

[0086] According to this configuration, the first recesses 16A, 16B and the second recesses 16C, 16D make it easier for the outer wall member 12 to deform into a more complex shape (e.g., a substantially hexagonal shape). As a result, there is a large difference in the degree of deformation of the outer wall member 12 and the inner wall member 22 when heated, and therefore the gaps G1, G2 between the outer wall member 12 and the inner wall member 22 become larger, and the outer surface of the food packaging box 10 can be further prevented from becoming hot.

[0087] In addition, in the food packaging box 10 of this embodiment, when the fold 16 in the outer wall member 12 is defined as a first fold, a second fold is provided in the first inner wall portion 22A and / or the second inner wall portion 22B, and the number of the second folds or the positions of the second folds in the first inner wall portion 22A and / or the second inner wall portion 22B are different from the number of the first folds or the positions of the first folds in the opposing outer wall member 12.

[0088] According to this configuration, a difference occurs in the degree of deformation of the outer wall member 12 and the inner wall member 22 when heated, so that the gaps G1, G2 between the outer wall member 12 and the inner wall member 22 become larger, and the outer surface of the food packaging box 10 can be further prevented from becoming hot.

[0089] In addition, in the food packaging box 10 of this embodiment, the retort pouch 100 has a pressure relief section 104 that is configured to allow the retort pouch 100 to be opened by an increase in internal pressure due to heating of the food 110, and gaps G1 and G2 are formed around the pressure relief section 104.

[0090] According to this configuration, steam coming out of the pressure relief section 104 of the retort pouch 100 inside the heated food packaging box 10 can be released to the outside through the gaps G1, G2 around the pressure relief section 104, so that steam does not become trapped inside the food packaging box 10 and the outer surface of the food packaging box 10 is further prevented from becoming hot.

[0091] Moreover, the food packaging box 10 according to this embodiment is assembled from a single sheet of paper.

[0092] This configuration makes it easy to assemble the food packaging box 10.

[0093] <Modification> The present invention is not limited to the above-described embodiment. In other words, the above-described embodiment may be modified by a person skilled in the art as appropriate, and the modifications may be included within the scope of the present invention as long as they include the characteristics of the present invention. In addition, the elements of the above-described embodiment and the modifications described below may be combined to the extent technically possible, and the combinations of these may be included within the scope of the present invention as long as they include the characteristics of the present invention.

[0094] For example, in the above embodiment, the gaps G1 and G2 are formed between the outer wall member 12 and the inner wall member 22, but only one of the gaps may be formed. Also, as shown in Fig. 10, the gaps G1 and G2 may be formed between the outer wall member 12 and the inner wall member 22 only when the push-in portion 34 is pushed in. [Explanation of symbols]

[0095] 10:Food packaging box 12: Exterior wall components 12A: Surface 12B: Back 16: Fold (first fold) 16A: First recess 16B: First recess 16C: Second recess 16D: Second recess 22: Inner wall material 22A: First inner wall part 22B: Second inner wall part 22C: Connection part 24: Fold (second fold) 30: First connection part 30A: Break 30B: Break 32: Second connection part 34: Push-in section 34A: Break 36: Contact plate 38: Break 100: Retort pouch (food bag) 104: Pressure relief section 110:Food 200: Paper G1: Gap G2: Gap

Claims

1. A food packaging box for packaging food bags in which food is sealed, A substantially cylindrical outer wall member that houses the food bag therein; an inner wall member provided between the outer wall member and the food bag, at least a portion of which faces the outer wall member at a distance to form a gap between the inner wall member and the outer wall member; A food packaging box comprising:

2. The outer wall member has a flat front surface when viewed from the radial outside of the outer wall member and a flat back surface when viewed from the radial outside, The inner wall member has a first inner wall portion that faces the front surface of the outer wall member and extends in a circumferential direction of the outer wall member, and a second inner wall portion that is disposed on the opposite side of the food bag from the first inner wall portion, faces the back surface of the outer wall member, and extends in a circumferential direction of the outer wall member. The food packaging box according to claim 1.

3. The circumferential length of the first inner wall portion is different from the circumferential length of the surface of the outer wall member. The food packaging box according to claim 2.

4. The circumferential length of the first inner wall portion is shorter than the circumferential length of the surface of the outer wall member. The food packaging box according to claim 3.

5. a circumferential length of one of the first inner wall portion and the second inner wall portion is different from a circumferential length of the other of the first inner wall portion and the second inner wall portion; The food packaging box according to claim 2.

6. an axial length of one of the first inner wall portion and the second inner wall portion is different from an axial length of the other of the first inner wall portion and the second inner wall portion; The food packaging box according to claim 2.

7. the inner wall member has a connection portion that connects one end portion of the first inner wall portion in the axial direction and one end portion of the second inner wall portion in the axial direction, The connection portion is exposed from one end of the outer wall member in the axial direction, and has a first connection portion which is one end of the connection portion in the radial direction, a second connection portion which is the other end of the connection portion in the radial direction, and a push-in portion which is connected to the first connection portion and the second connection portion and has a slit formed between the first connection portion and the second connection portion and can be pushed in by a user. The food packaging box according to claim 2.

8. The pushing portion has a pair of abutment plates facing the outer wall member, The pair of abutment plates are folded when the push-in portion is not pushed in, and when the push-in portion is pushed in, the pair of abutment plates are expanded so that the ends of the expanded abutment plates abut against the inner surface of the outer wall member, and the abutment state is maintained. The food packaging box according to claim 7.

9. The outer wall member is provided with a fold extending in the axial direction of the outer wall member. The food packaging box according to any one of claims 2 to 8.

10. A pair of first recesses are provided on the surface of the outer wall member as the folds, A pair of second recesses are provided on the back surface as the folds in parallel with the first recesses. The food packaging box according to claim 9.

11. When the fold is the first fold, The first inner wall portion and / or the second inner wall portion are provided with second folds, and the number of the second folds or the positions of the second folds in the first inner wall portion and / or the second inner wall portion are different from the number of the first folds or the positions of the first folds in the opposing outer wall member. The food packaging box according to claim 10.

12. The food bag has a pressure relief section configured to open the food bag by increasing the internal pressure due to heating of the food, The gap is formed around the pressure relief portion. The food packaging box according to any one of claims 1 to 8.

13. The food packaging box is constructed from a single sheet of paper; The food packaging box according to any one of claims 1 to 8.

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