Packaging containers

Abstract

To provide a packaging container in which wrinkles are inconspicuous even when wrinkles occur in a wrap film in wrap packaging.SOLUTION: A packaging container (1) comprises a container main body (2). The container main body (2) comprises a bottom face part (20), a peripheral wall part (30) extending upward from the bottom face part (20), and a flange part (40) extending outward from the peripheral wall part (30). The flange part (40) comprises a wrap tension support part (42) for supporting tension of a wrap film in wrap packaging. The wrap tension support part (42) is formed so as to be swollen upward and has a curved top part.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] For example, packaging containers are used to package foods and the like. Packaging containers that have a container body with a bottom surface, a peripheral wall portion extending upward from the bottom surface, and a flange portion extending outward from the peripheral wall portion are widely used. When using such packaging containers to package, for example, sashimi, side dishes, and the like, a wrap film may be wrapped around the container body while the food is contained in the container body to perform wrap packaging.

[0003] For example, JP 2012-158387 A (Patent Document 1) discloses a packaging container that is intended for such wrap packaging. The packaging container in Patent Document 1 is said to have a thick reinforcing part between the protruding part and the horizontal end of the flange part in order to prevent the wrap film from wrinkling and to improve strength against bending stress.

[0004] However, wrinkles in the wrap film may occur due to the settings of the device such as the wrap packaging machine, and it is difficult to completely prevent wrinkles from occurring only by the configuration of the packaging container. Furthermore, when the packaging container of Patent Document 1 is wrapped, if wrinkles occur in the wrap film, there is an inconvenience that the wrinkles become more noticeable. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2012-158387 A Summary of the Invention [Problem to be solved by the invention]

[0006] It is desirable to realize a packaging container that makes wrinkles inconspicuous even if wrinkles occur in the wrap film during wrapping. [Means for solving the problem]

[0007] The packaging container according to the present invention comprises: A packaging container having a container body, The container body has a bottom surface portion, a peripheral wall portion extending upward from the bottom surface portion, and a flange portion extending outward from the peripheral wall portion, The flange portion is provided with a wrap tension support portion that supports the tension of the wrap film during wrap packaging, The wrap tension support portion is formed so as to protrude upward and has a curved apex portion.

[0008] According to this configuration, the tension of the wrap film is supported by the wrap tension support part during wrap packaging. Since the wrap tension support part is formed to protrude upward, even if wrinkles occur in the wrap film, the wrinkles can be concentrated in that area. By intentionally limiting the position where wrinkles occur to a specific position, the wrinkles can be made less noticeable. In addition, since the wrap tension support part has a curved top, it is possible to alleviate the application of excessive tension to the wrap film at a pinpoint, and from this point on, the wrinkles can also be made less noticeable. As a result, a packaging container can be realized in which wrinkles are less noticeable even if wrinkles occur in the wrap film during wrap packaging.

[0009] Preferred embodiments of the present invention will be described below. However, the scope of the present invention is not limited to the preferred embodiments described below.

[0010] In one embodiment, The container body is formed in a rectangular shape in a plan view, The flange portion includes a pair of long sides and a pair of short sides, It is preferable that the formation mode of the curved apex of each of the long side wrap tension support portion, which is the wrap tension support portion provided on the long side portion, and the short side wrap tension support portion, which is the wrap tension support portion provided on the short side portion, differ from each other.

[0011] According to this configuration, since the long side wrap tension support parts and the short side wrap tension support parts have curved apexes with different shapes, the long side parts and the short side parts of the container body that is rectangular in plan view have different appearances, thereby improving the design of the container body.

[0012] In one embodiment, It is preferable that the height of the highest point of the long side wrap tension supporting portion and the height of the highest point of the short side wrap tension supporting portion are different from each other.

[0013] According to this configuration, by making the heights of the long side wrap tension support parts and the short side wrap tension support parts different, it is possible to make the three-dimensional shapes of the long side parts and the short side parts different, thereby effectively improving the design of the container body.

[0014] In one embodiment, It is preferable that the distance along the long side portion from the center position of the long side portion to the position of the highest point of the long side wrap tension support portion and the distance along the short side portion from the center position of the short side portion to the position of the highest point of the short side wrap tension support portion are different from each other.

[0015] According to this configuration, by making the relative positions of the long side wrap tension support parts and the short side wrap tension support parts different on each side in a plan view, it is possible to make the three-dimensional shapes of the long side parts and the short side parts different, thereby effectively improving the design of the container body.

[0016] In one embodiment, The container body is formed in a rectangular shape in a plan view, It is preferable that a reinforcing recess is formed downward at each of the four corners of the flange.

[0017] According to this configuration, the strength of the container body can be improved due to the presence of the reinforcing recess.

[0018] In one embodiment, It is preferable that the reinforcing recess is formed at the base of at least one of the wrap tension support parts.

[0019] According to this configuration, the strength can be effectively improved even in the configuration in which the flange portion includes a wrap tension support portion having a curved apex portion that protrudes upward as described above.

[0020] In one embodiment, It is preferable that the container body further includes a guide portion that is formed to rise from or be recessed from the bottom surface portion and that promotes the alignment and arrangement of the contained objects.

[0021] According to this configuration, when storing the stored items, the stored items can be easily arranged in an orderly manner by being guided by the guide portion.

[0022] Further features and advantages of the present invention will become more apparent from the following description of exemplary and non-limiting embodiments, which are given with reference to the drawings. [Brief description of the drawings]

[0023] [Figure 1] A perspective view of the container body [Diagram 2] Plan view of the container body [Diagram 3] Front view of the container body [Figure 4] Side view of the container body [Diagram 5] Enlarged view of part of Figure 2 [Figure 6] Enlarged view of part of Figure 2 [Figure 7] A perspective view of a corner portion of the container body. [Figure 8] A perspective view of a packaging container wrapped in plastic. [Figure 9] A plan view of a container body in another embodiment [Figure 10] A plan view of a container body in another embodiment [Figure 11] A plan view of a container body in another embodiment DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] An embodiment of a packaging container will be described with reference to the drawings. In this embodiment, a packaging container (food packaging container) 1 that contains food such as raw fish as a contained object will be described as an example. In this embodiment, an example in which a wrap film 6 is wrapped around a container body 2 of the packaging container 1 for packaging (see FIG. 8) will be described.

[0025] In the following, the direction toward the inside of the packaging container 1 (direction from the outer edge toward the center) will be referred to as "inner", and the direction toward the outside of the packaging container 1 (direction from the center toward the outer edge) will be referred to as "outer".

[0026] As shown in FIG. 1, the packaging container 1 includes a container body 2. The container body 2 is formed by sheet molding. In this embodiment, the container body 2 is formed by thermoforming a thermoplastic resin foam sheet. The thermoplastic resin foam sheet includes a thermoplastic resin foam layer mainly made of a thermoplastic resin. The thermoplastic resin constituting the thermoplastic resin foam layer is not particularly limited. For example, general thermoplastic resins such as polyolefin (polyethylene, polypropylene, etc.), polyvinyl chloride, polystyrene, polyester (polyethylene terephthalate, etc.), and acrylic resin can be appropriately used. Each of these may be a homopolymer, a copolymer with other monomers, a mixture with other resins, or a combination thereof. A polystyrene-based resin is preferable.

[0027] The thermoplastic resin foam sheet may also have a thermoplastic resin non-foamed layer mainly made of a thermoplastic resin on at least one side of the thermoplastic resin layer. The thermoplastic resin constituting the thermoplastic resin non-foamed layer is not particularly limited. For example, general thermoplastic resins such as polyolefins (polyethylene, polypropylene, etc.), polyvinyl chloride, polystyrene, polyesters (polyethylene terephthalate, etc.), and acrylic resins can be appropriately used. Each of these may be a homopolymer, a copolymer with other monomers, a mixture with other resins, or a combination thereof. A polystyrene-based resin or a polyolefin-based resin is preferable. In addition, in order to laminate each layer, each method such as a co-extrusion method, an extrusion lamination method, and a thermal lamination method can be adopted.

[0028] As shown in FIG. 2, the container body 2 is formed in a rectangular shape when viewed from above. "Rectangular shape when viewed from above" means that the outer shape when viewed from above is rectangular or approximately rectangular as a whole. Therefore, as long as the outer shape when viewed from above is approximately rectangular as a whole, the four corners of the container body 2 may be chamfered (folded) or curved. In this embodiment, the container body 2 is formed in a rectangular shape when viewed from above, and has a pair of long sides and a pair of short sides. In this example, the container body 2 is formed in a rectangular shape that is relatively close to a square, with an aspect ratio of approximately 1.13:1.

[0029] The container body 2 also has a bottom surface portion 20, a peripheral wall portion 30 extending upward from the bottom surface portion 20, and a flange portion 40 extending outward from the peripheral wall portion 30.

[0030] The bottom surface portion 20 is formed in a rectangular shape in a plan view. A central protrusion 21 that protrudes upward is formed in the center of the bottom surface portion 20. The central protrusion 21 is formed in a rectangular shape in a plan view, and is provided so that its four vertices face each side of the container body 2. In addition, rib-like protrusions 22 that are formed to rise linearly are provided around the central protrusion 21 on the bottom surface portion 20. In this embodiment, the four rib-like protrusions 22 are arranged so as to divide the bottom surface portion 20 into four equal parts. The rib-like protrusions 22 play a role in encouraging the alignment and arrangement of the contained objects, and function as a "guide portion."

[0031] An annular protrusion 24 is formed on the outer edge of the bottom surface portion 20, extending around the entire circumference of the bottom surface portion 20. Raised portions 25 that rise upward are formed at the four corners of the annular protrusion 24. The annular protrusion 24 is formed flat, and the raised portions 25 are formed about 1 to 5 mm higher than the flat annular protrusion 24. A square groove portion 27 that is roughly L-shaped in plan view is formed on the outer side of the raised portions 25.

[0032] The peripheral wall portion 30 is formed continuously from the bottom surface portion 20. The peripheral wall portion 30 is formed so as to incline outward as it goes upward. In this embodiment, the peripheral wall portion 30 is formed with a bulging portion 32 that bulges inward. The bulging portion 32 is formed in a substantially trapezoidal shape. The bulging portion 32 is formed continuously upward from the annular protrusion 24, and is disposed in a state in which it is sandwiched between two adjacent angular groove portions 27. In the following, the bulging portion 32 formed on the long side portion of the container body 2 having a rectangular shape in a plan view is referred to as a long side bulging portion 32A, and the bulging portion 32 formed on the short side portion is referred to as a short side bulging portion 32B. The long side bulging portion 32A in this embodiment is formed larger in both height and width than the short side bulging portion 32B.

[0033] The flange portion 40 extends outward from the upper end of the peripheral wall portion 30. The flange portion 40 is formed in a rectangular shape in a plan view (in this example, a rectangular shape in a plan view), and includes a pair of long sides 40A and a pair of short sides 40B.

[0034] The flange portion 40 is provided with a wrap tension support portion 42 that supports the tension of the wrap film 6 during wrap packaging. In the following, the wrap tension support portion 42 provided on the long side portion 40A will be referred to as the long side wrap tension support portion 42A, and the wrap tension support portion 42 provided on the short side portion 40B will be referred to as the short side wrap tension support portion 42B. As shown in Figures 3 and 4, the wrap tension support portions 42 (the long side wrap tension support portion 42A and the short side wrap tension support portion 42B) are formed to protrude upward and have a curved apex 44.

[0035] In this embodiment, the long side wrap tension support portion 42A and the short side wrap tension support portion 42B have different curved apexes 44. As shown in FIG. 3, the long side wrap tension support portion 42A is formed to protrude in a cone shape when viewed from the side at specific positions (two specific positions in this example) of the long side portion 40A of the flange portion 40. The curved apex 44 of the long side wrap tension support portion 42A is rounded but relatively pointed, and has a relatively large curvature. On the other hand, as shown in FIG. 4, the short side wrap tension support portion 42B is formed to protrude in an aspite shape when viewed from the side at specific regions (each region that divides the short side portion 40B in half in this example) of the short side portion 40B of the flange portion 40. The curved apex 44 of the short side wrap tension support portion 42B is formed to protrude in a gradual shape when viewed from the side.

[0036] Additionally, on the long side portion 40A of the flange portion 40, the two long side wrap tension support portions 42A are spaced apart from each other, with straight line portions 45 present between them and on both outer sides of each. On the other hand, on the short side portion 40B of the flange portion 40, the two short side wrap tension support portions 42B are adjacent to each other, and are smoothly continuous with each other via a curved valley portion 46 that curves downward.

[0037] In this embodiment, the height (Ha) of the highest point of the long side lap tension support portion 42A and the height (Hb) of the highest point of the short side lap tension support portion 42B are different from each other. Here, the highest points of the long side lap tension support portion 42A and the short side lap tension support portion 42B are the apexes of the respective curved apexes 44. In this embodiment, the height (Ha) of the highest point of the long side lap tension support portion 42A is set lower than the height (Hb) of the highest point of the short side lap tension support portion 42B. The height (Ha) of the highest point of the long side lap tension support portion 42A is set lower by about 1 to 5 mm than the height (Hb) of the highest point of the short side lap tension support portion 42B.

[0038] In this embodiment, the distance (La) along the long side portion 40A from the center position of the long side portion 40A to the highest point of the long side wrap tension support portion 42A is approximately equal to the distance (Lb) along the short side portion 40B from the center position of the short side portion 40B to the highest point of the short side wrap tension support portion 42B. Here, the lengths of the long side portion 40A and the short side portion 40B are different from each other. Therefore, in this embodiment, the relative position of the highest point of the long side wrap tension support portion 42A to the center position of the long side portion 40A is different from the relative position of the highest point of the short side wrap tension support portion 42B to the center position of the short side portion 40B.

[0039] In this embodiment, the height (Hc) of the lowest point of the long side portion 40A and the height (Hd) of the lowest point of the short side portion 40B are different from each other. Here, the lowest point of the long side wrap tension support portion 42A is at any position of the linear portion 45, and the lowest point of the short side wrap tension support portion 42B is at the bottom position of the valley portion 46. In this embodiment, the height (Hc) of the lowest point of the long side portion 40A is set lower than the height (Hd) of the lowest point of the short side portion 40B. The height (Hc) of the lowest point of the long side portion 40A is set lower by about 1 to 5 mm than the height (Hd) of the lowest point of the short side portion 40B.

[0040] 5, the width (Wa) of the highest point (the apex of the curved apex 44) and the width (Wc) of the lowest point (any position on the linear portion 45) of the long side wrap tension support portion 42A are different from each other. In this embodiment, the width (Wa) of the highest point of the long side wrap tension support portion 42A is set narrower than the width (Wc) of the lowest point. The width (Wa) of the highest point of the long side wrap tension support portion 42A is set narrower than the width (Wc) of the lowest point by about 0.5 to 2 mm.

[0041] 6, the width (Wb) of the highest point (the apex of the curved apex 44) and the width (Wd) of the lowest point (the bottom position of the valley 46) of the short side wrap tension support part 42B are different from each other. In this embodiment, the width (Wb) of the highest point of the short side wrap tension support part 42B is set narrower than the width (Wd) of the lowest point. The width (Wb) of the highest point of the short side wrap tension support part 42B is set narrower than the width (Wd) of the lowest point by about 2 to 8 mm.

[0042] In this embodiment, the short-side wrap tension support parts 42B are formed so as to protrude straight upward, whereas the long-side wrap tension support parts 42A are formed so as to protrude upward and be slightly inclined inward.

[0043] In this embodiment, the long side wrap tension support portion 42A and the short side wrap tension support portion 42B are formed in different ways. This results in the long side portion 40A and the short side portion 40B having significantly different appearances in the container body 2 that is rectangular in plan view. This improves the design of the container body 2.

[0044] As shown in Fig. 7, reinforcing recesses 48 recessed downward are formed at the four corners of the flange portion 40. By providing such reinforcing recesses 48, the strength of the container body 2 can be improved. The reinforcing recesses 48 are formed at the base of at least one of the wrap tension support portions 42. In this embodiment, the reinforcing recesses 48 are formed at the base of the short side wrap tension support portion 42B that protrudes in an aspite shape when viewed from the side, so as to partially bite into the short side wrap tension support portion 42B. This makes it possible to effectively improve the strength of the container body 2.

[0045] As shown in FIG. 8, the packaging container 1 of this embodiment can be applied to wrap packaging in which a wrap film 6 is wrapped around the container body 2 for packaging. In this type of wrap packaging, the tension of the wrap film 6 acts on the flange portion 40 of the container body 2. In this embodiment, the wrap tension support portion 42 is provided on the flange portion 40, so the tension of the wrap film 6 is supported by the wrap tension support portion 42. Since the wrap tension support portion 42 is formed to protrude upward, even if the wrap film 6 wrinkles, the wrinkles can be concentrated in that area. In particular, the wrinkles can be concentrated on the long side wrap tension support portion 42A, which has a relatively large curvature. By intentionally limiting the position where the wrinkles occur to a specific position, the wrinkles can be made less noticeable.

[0046] Furthermore, because wrap tension support portion 42 has curved apex 44, it is possible to alleviate excessive tension from being applied to the wrap film 6 at a pinpoint, thereby making wrinkles less noticeable. As a result, it is possible to realize a packaging container 1 in which wrinkles are less noticeable even if wrinkles are produced in wrap film 6 during wrapping.

[0047] Furthermore, by displaying the wrapped packaging container 1 on a display stand and shining light from a lighting device, a moire pattern can be generated on the surface of the wrap film 6 supported along the wrap tension support portion 42 that protrudes upward. This allows the surface of the wrapped packaging container 1 to be presented in a dazzling manner. This can greatly improve the design, not only of the appearance of the container body 2 itself but also of how it looks after wrapping, and can increase the appeal to consumers.

[0048] Other embodiments (1) In the above embodiment, the height (Ha) of the highest point of the long side lap tension support portion 42A is lower than the height (Hb) of the highest point of the short side lap tension support portion 42B. However, the present invention is not limited to such a configuration, and the height (Ha) of the highest point of the long side lap tension support portion 42A may be set higher than the height (Hb) of the highest point of the short side lap tension support portion 42B. Alternatively, the height (Ha) of the highest point of the long side lap tension support portion 42A and the height (Hb) of the highest point of the short side lap tension support portion 42B may be set equal to each other.

[0049] (2) In the above embodiment, the distance (La) from the center position of the long side portion 40A to the highest point of the long side wrap tension support portion 42A and the distance (Lb) from the center position of the short side portion 40B to the highest point of the short side wrap tension support portion 42B are approximately equal. However, the present invention is not limited to such a configuration, and the distance (La) from the center position of the long side portion 40A to the highest point of the long side wrap tension support portion 42A and the distance (Lb) from the center position of the short side portion 40B to the highest point of the short side wrap tension support portion 42B may be different from each other, as shown in Figs. 9 and 10. As shown in these figures, the aspect ratio of the outer shape of the container body 2 may also be larger.

[0050] (3) In the above embodiment, the height (Hc) of the lowest point of the long side portion 40A is lower than the height (Hd) of the lowest point of the short side portion 40B. However, the present invention is not limited to such a configuration, and the height (Hc) of the lowest point of the long side portion 40A may be set higher than the height (Hd) of the lowest point of the short side portion 40B. Alternatively, the height (Hc) of the lowest point of the long side portion 40A and the height (Hd) of the lowest point of the short side portion 40B may be set equal to each other.

[0051] (4) In the above embodiment, a configuration has been described in which the width (Wa) at the highest point of the long side wrap tension support portion 42A is narrower than the width (Wc) at the lowest point. However, the present invention is not limited to such a configuration, and the width (Wa) at the highest point of the long side wrap tension support portion 42A may be set wider than the width (Wc) at the lowest point. Alternatively, the width (Wa) at the highest point of the long side wrap tension support portion 42A may be set equal to the width (Wa) at the lowest point.

[0052] (5) In the above embodiment, a configuration has been described in which the width (Wb) at the highest point of the short side wrap tension support portion 42B is narrower than the width (Wd) at the lowest point. However, the present invention is not limited to such a configuration, and the width (Wb) at the highest point of the short side wrap tension support portion 42B may be set wider than the width (Wd) at the lowest point. Alternatively, the width (Wb) at the highest point of the short side wrap tension support portion 42B may be set equal to the width (Wd) at the lowest point.

[0053] (6) In the above embodiment, the long side lap tension support portion 42A and the short side lap tension support portion 42B have different curved apexes 44. However, the present invention is not limited to such a configuration, and the long side lap tension support portion 42A and the short side lap tension support portion 42B may have the same curved apexes 44. In this case, the common shape of the long side lap tension support portion 42A and the short side lap tension support portion 42B may be a cone shape or an aspite shape, or may be another shape.

[0054] (7) In the above embodiment, a configuration has been described in which the reinforcing recesses 48 are formed at the four corners of the flange portion 40, at the base of the short side lap tension support portion 42B. However, the present invention is not limited to such a configuration, and depending on the shapes of the long side lap tension support portion 42A and the short side lap tension support portion 42B, the reinforcing recesses 48 may be formed at the base of the long side lap tension support portion 42A. Alternatively, the reinforcing recesses 48 may be formed away from the long side lap tension support portion 42A and the short side lap tension support portion 42B. Alternatively, such a reinforcing recess 48 may not be provided.

[0055] (8) In the above embodiment, a configuration in which the rib-shaped protrusions 22 are formed on the bottom surface portion 20 has been described as an example. However, the present invention is not limited to such a configuration, and the bottom surface portion 20 may be provided with a groove that is recessed and promotes the alignment of the contained objects. In such a configuration, the groove corresponds to the "guide portion." This groove may be provided in place of the rib-shaped protrusions 22, or may be provided together with the rib-shaped protrusions 22. Alternatively, the bottom surface portion 20 may not be provided with the rib-shaped protrusions 22 or grooves at all.

[0056] (9) In the above embodiment, as shown in Fig. 11, the container body 2 may have a partition wall 29 that rises from the bottom surface 20 and partitions the storage section that stores the contents. Such a partition wall 29 also plays a role in facilitating the alignment of the contents and functions as a "guide section." The container body 2 having the partition wall 29 can be suitably used as a container for lunch boxes, for example.

[0057] (10) In the above embodiment, an example has been described in which the container body 2 containing the contents is wrapped using the wrap film 6. However, the present invention is not limited to such a configuration, and the packaging container 1 may be configured to include the container body 2 and a lid body that engages with the container body 2, and to close the container body 2 containing the contents with the lid body for packaging. In such a usage mode, the wrap film 6 is not wrapped around, and therefore the wrap tension support part 42 does not perform the function of supporting the tension of the wrap film 6. However, even in such a case, the characteristic streamlined outer shape of the wrap tension support part 42 of this embodiment can enhance the design of the container body 2.

[0058] (11) The configurations disclosed in the above-mentioned embodiments (including the above-mentioned embodiments and other embodiments; the same applies below) can be applied in combination with configurations disclosed in other embodiments, as long as no contradiction occurs. As for other configurations, the embodiments disclosed in this specification are illustrative in all respects and can be appropriately modified within the scope of the present disclosure. [Explanation of symbols]

[0059] 1 Packaging container 2 Container body 6. Plastic wrap 20 Bottom part 22 Rib-like protrusion (guide part) 29 Partition wall (guide section) 30 Peripheral wall part 40 Flange 40A Long side 40B Short side 42 Lap tension support 42A Long side lap tension support 42B Short side lap tension support 44 Curved top 48 Reinforcement recess

Claims

1. A packaging container having a container body formed in a rectangular shape in a plan view, The container body has a bottom surface portion, a peripheral wall portion extending upward from the bottom surface portion, and a flange portion extending outward from the peripheral wall portion, The flange portion includes a pair of long side portions and a pair of short side portions, and the flange portion is provided with a wrap tension support portion that supports the tension of the wrap film during wrap packaging, The wrap tension support portion is formed so as to protrude upward and has a curved apex portion, the short side lap tension support portion, which is the lap tension support portion provided on the short side portion, is formed so as to protrude straight upward, and the long side lap tension support portion, which is the lap tension support portion provided on the long side portion, is formed so as to protrude upward while being inclined inward, the height of the highest point of the short side wrap tension support portion and the height of the highest point of the long side wrap tension support portion are different from each other, the width of the highest point and the width of the lowest point of the short side wrap tension supporting portion are different from each other, A packaging container in which the width at the highest point and the width at the lowest point of the long side wrap tension supporting portion are different from each other.

2. 2. The packaging container according to claim 1, wherein a plurality of the wrap tension support portions are provided on the flange portion on each side symmetrically with respect to a center position of each side.

3. 3. The packaging container according to claim 2, wherein the relative positions of the highest points of the wrap tension support parts with respect to the center positions of the respective sides are different between the flange part located on one opposite side and the flange part located on the other opposite side.

4. 3. The packaging container according to claim 2, wherein the flange portion located on one opposite side and the flange portion located on the other opposite side have different distances along each side from the center position of each side to the highest point of the wrap tension support portion.

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