JP6881034B2 - Container with lid and container used for it - Google Patents

Description

The present invention relates to a container with a lid and a container used therein.

A conventional container with a lid is disclosed in Patent Document 1. This container with a lid includes a container for a resin molded product and a lid made of a resin film. The container is formed by injection molding and has a storage portion having an opening for opening the upper surface and a flange portion protruding outward from the upper edge of the storage portion. The flange portion is provided with a protrusion protruding in the radial direction from the outer peripheral end.

An annular frame is attached to the lower surface of the lid. The frame body is provided with engaging claws hanging from an upper wall facing the lower surface of the lid. The frame is formed by injection molding integrally with the container, and the lower end of the engaging claw and the protrusion are connected via a thinly molded film. The lid is heat-bonded to the upper surface of the frame and the upper surface of the flange portion arranged at the same height by cutting the film.

When opening the container with a lid, the lid is peeled off from the flange portion and opened integrally with the frame body. When the lid is closed, the engaging claw elastically deforms in the horizontal direction and engages with the protrusion of the container in the vertical direction. As a result, the container with a lid after opening can be resealed.

Special Table 2014-502584

However, according to the conventional container with a lid, the engaging claw is elastically deformed in the horizontal direction and engages with the protrusion in the vertical direction. Therefore, it is necessary to increase the wall thickness of the engaging claw, and there is a problem that the cost of the container with a lid increases.

An object of the present invention is to provide a container with a lid that can be resealed and can reduce costs, and a container used therein.

In order to achieve the above object, the container of the present invention is connected to a storage portion having an open upper surface, an annular inner flange portion protruding outward from the upper edge of the storage portion, and an outer side of the inner flange portion. In a container of a resin molded product provided with an annular outer flange portion and a plurality of slits arranged side by side in the circumferential direction via a connecting portion that can be separated between the inner flange portion and the outer flange portion. The outer flange portion is arranged above the inner flange portion and can be displaced to the same height as the inner flange portion by elasticity.

According to this configuration, when the upper surfaces of the inner flange portion and the outer flange portion are arranged at the same height and the lid of the resin film is heat-bonded, the lid is urged upward by the outer flange portion. When the connecting portion is separated, the urging force of the outer flange portion is released, and the engaging pieces on both sides divided by the slit are engaged in the vertical direction.

Further, the present invention is characterized in that, in the container having the above configuration, a recess is provided between the inner flange portion and the outer flange portion, and the slit is arranged in the recess.

Further, the present invention is characterized in that, in the container having the above structure, the upper surface of the outer flange portion is inclined downward inward.

Further, the present invention is characterized in that, in the container having the above structure, the upper surface of the inner flange portion is inclined downward inward.

Further, the present invention is characterized in that at least a part of the slits is formed in a corrugated shape in the container having the above structure.

Further, the present invention is characterized in that, in the container having the above configuration, a hinge portion having a larger slit interval than the connecting portion is provided, and the corrugated slit is provided facing the hinge portion.

Further, according to the present invention, in the container having the above configuration, the inner flange portion is formed in a substantially rectangular shape having curved corner portions, and the hinge portion is provided along one of the pair of opposite corner portions and the other. It is characterized in that the said slit having a corrugated shape is provided along the above.

Further, in the present invention, in the container having the above configuration, the inner flange portion is formed in a substantially rectangular shape, and the inner peripheral surface of the slit arranged along the pair of long sides of the inner flange portion is curved inwardly. It is characterized by that.

Further, the container with a lid of the present invention includes a container having each of the above configurations and a lid made of a resin film that is heat-bonded to at least a part of the upper surface of the outer flange portion and the entire circumference of the upper surface of the inner flange portion. When the connecting portion is separated and the lid is opened integrally with the outer flange portion, a pair of engaging pieces divided by the slit is formed between the inner flange portion and the outer flange portion, and the lid is closed. The engaging pieces engage with each other when closed again.

According to this configuration, the lid that is heat-bonded to the inner flange portion and the outer flange portion is urged upward by the outer flange portion. When the lid is opened integrally with the outer flange portion, the connecting portion is separated and the urging force of the outer flange portion is released. When the lid is closed again, the engaging pieces are elastically deformed in the vertical direction, and the outer engaging pieces are arranged below the inner engaging pieces and engage with each other in the vertical direction.

According to the container of the present invention, the cost of the resealable container with a lid can be reduced.

Further, according to the container with a lid of the present invention, the cost of the container with a lid that can be resealed can be reduced.

An exploded perspective view showing a container with a lid according to the first embodiment of the present invention. A perspective view showing a container with a lid according to the first embodiment of the present invention. Top view showing a container of a container with a lid according to the first embodiment of the present invention. AA sectional view of FIG. Enlarged view of part B in FIG. Side sectional view showing an outer flange portion and an inner flange portion in a state where the lid of the container with a lid of the first embodiment of the present invention is heat-bonded. Perspective view of the container with a lid according to the first embodiment of the present invention when opened. Side sectional view showing an outer flange portion and an inner flange portion when the container with a lid according to the first embodiment of the present invention is opened. Side sectional view showing an outer flange portion and an inner flange portion in a state where the lid of the container with a lid of the first embodiment of the present invention is closed again. Top view showing a container of a container with a lid according to a second embodiment of the present invention. Top view showing a container of a container with a lid according to a third embodiment of the present invention. Side sectional view showing the outer flange portion and the inner flange portion of the container of the container with a lid according to the fourth embodiment of the present invention. Side sectional view showing an outer flange portion and an inner flange portion in a state where the lid of the container with a lid of the fourth embodiment of the present invention is heat-bonded. Side sectional view showing the outer flange portion and the inner flange portion of the container of the container with a lid according to the fifth embodiment of the present invention. Side sectional view showing an outer flange portion and an inner flange portion in a state where the lid of the container with a lid of the fifth embodiment of the present invention is heat-bonded.

<First Embodiment>
An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an exploded perspective view of the upper surface of the container with a lid 10 before the lid 50 is heat-bonded. FIG. 2 shows a perspective view after the lid 50 of the container with a lid 10 is heat-bonded.

The container with a lid 10 includes a container 15 and a lid 50. The container 15 is made of a resin molded product, and is formed thin by vacuum forming a thermoplastic resin such as polypropylene. The container 15 may be formed thin by injection molding.

The container 15 has a bottomed tubular storage portion 20 having an opening 20a on the upper surface. The contents are stored in the storage unit 20. The contents are not particularly limited, but examples include side dishes, snacks such as nuts, dried fruits, and confectionery.

An annular inner flange portion 25 is provided on the upper edge of the storage portion 20 so as to project outward. An annular outer flange portion 30 is continuously provided on the outer peripheral side of the inner flange portion 25. A grip portion 31 projecting outward is provided at one corner of the outer flange portion 30.

The lid 50 is made of a resin film and has a heat-bonding layer on the inner surface. The lid 50 is heat-bonded to the entire circumference of the upper surface of the inner flange portion 25 by the heat-bonding layer, whereby the storage portion 20 is sealed. Further, it is heat-bonded to at least a part of the upper surface of the outer flange portion 30.

FIG. 3 shows a top view of the container 15, and FIG. 4 shows a sectional view taken along the line AA of FIG. The corners of the opening 20a on the upper surface of the storage portion 20 are formed in a substantially rectangular shape with curved corners, and the bottom wall 20b of the storage portion 20 is formed in a substantially rectangular shape similar to the opening 20a. The bottom wall 20b may be formed in a shape non-similar to the opening 20a. The bottom wall 20b is provided with a substantially rectangular protrusion 21 that protrudes upward. The protrusion 21 improves the strength of the storage portion 20.

The inner flange portion 25 and the outer flange portion 30 are formed in a substantially rectangular shape along the opening 20a. A recess 29 is provided between the inner flange portion 25 and the outer flange portion 30. A plurality of slits 32 are arranged in the recess 29. The slits 32 are arranged side by side in the circumferential direction via the connecting portion 33 and the hinge portion 22 that connect the inner flange portion 25 and the outer flange portion 30.

The connecting portion 33 is formed to have a detachable length. The hinge portion 22 has a larger interval between the slits 32 than the connecting portion 33, making it difficult to separate the hinge portion 22. Further, the hinge portion 22 is arranged at a corner portion facing the grip portion 31, and rotatably holds the lid 50 (see FIG. 2) opened from the grip portion 31 as described later.

In the present embodiment, the slits 32 are provided at eight locations, the connecting portions 33 are provided at six locations, and the hinge portions 22 are provided at two locations.

Further, slits 32 arranged along a pair of long sides of the inner flange portion 25 are provided between both corner portions, and as shown in FIG. 3, the inner surface 32a is slightly curved inward.

FIG. 5 shows an enlarged view of a portion B of FIG. The outer flange portion 30 is arranged above the inner flange portion 25, and the upper surface 30b of the outer flange portion 30 and the upper surface 25b of the inner flange portion 25 are inclined inward. Since the container 15 is formed to be thin, the outer flange portion 30 can be displaced to the same height as the inner flange portion 25 by the elasticity of the container 15 including the elastic deformation of the recess 29.

A protrusion 25c is provided on the upper surface 25b of the inner flange portion 25, and the lid 50 (see FIG. 1) is heat-bonded onto the protrusion 25c.

The recess 29 arranged between the inner flange portion 25 and the outer flange portion 30 is formed in a U-shaped cross section, and the slit 32 is arranged at the bottom of the recess 29. The slit 32 may be provided on the side surface of the recess 29 on the inner flange portion 25 side. The recess 29 may be formed with a substantially rectangular cross section or a substantially trapezoidal cross section, and a slit 32 may be provided on the bottom surface or the side surface of the recess 29. Further, the recess 29 may be formed in a V-shaped cross section or the like, and the slit 32 may be provided inside the lower end of the recess 29.

FIG. 6 shows a side sectional view of the inner flange portion 25 and the outer flange portion 30 of the container with a lid 10 in which the lid 50 is heat-bonded to the container 15. The lid 50 is arranged on the container 15 and is weighted by heating the inner flange portion 25 and the outer flange portion 30. As a result, the heat-bonding layer of the lid 50 is melted, and the lid 50 is heat-bonded to the inner flange portion 25 and the outer flange portion 30 by the bonding portion 52 and the bonding portion 53. Although the heat-bonding layer is provided on the entire lower surface of the lid 50, only the parts of the bonding portion 52 and the bonding portion 53 where the heat-bonding layer is melted and heat-bonded are described in the following figure for easy understanding. There is.

When the lid 50 is heat-bonded, the outer flange portion 30 is elastically arranged at the same height as the inner flange portion 25, and the upper surface 25b of the inner flange portion 25 and the upper surface 30b of the outer flange portion 30 are arranged horizontally. As a result, the outer flange portion 30 urges the lid 50 upward. Further, the outer flange portion 30 inclined before thermal bonding rotates to urge the recess 29 toward the inner peripheral side.

In the container with lid 10 having the above configuration, when the user grips and pulls up the grip portion 31, the container with lid 10 is opened as shown in FIG. That is, the connecting portion 33 (see FIG. 3) is separated, the adhesive portion 52 (see FIG. 6) is peeled off, and the lid 50 is integrally opened with the outer flange portion 30. As a result, the contents in the storage unit 20 can be taken out. At this time, the lid 50 is rotatably held by the hinge portion 22 (see FIG. 3).

FIG. 8 shows a side sectional view of the outer flange portion 30 and the inner flange portion 25 with the lid 50 open. By disconnecting the connecting portion 33 (see FIG. 3), the recess 29 (see FIG. 5) is divided by the slit 32 (see FIG. 5) to form a pair of engaging pieces 29a and an engaging piece 29b. At this time, the urging force of the outer flange portion 30 is released, the outer engaging piece 29b is lowered, and the tip of the engaging piece 29b is arranged inside the outer peripheral edge of the slit 32 before thermal bonding of the lid 50. .. Further, the inner flange portion 25 from which the lid 50 has been peeled off is returned to the state before the heat bonding of the lid 50 and is inclined, and is arranged outside the inner peripheral edge of the slit 32 before the heat bonding of the lid 50.

FIG. 9 shows a side sectional view of the outer flange portion 30 and the inner flange portion 25 when the lid 50 of the opened container 10 with a lid is closed again. When the lid 50 is closed, the engaging piece 29a elastically deforms in the vertical direction, gets over the engaging piece 29b, and engages with the engaging piece 29b in the vertical direction. As a result, the lid 50 is held in the container 15, and the container with lid 10 can be resealed.

According to the present embodiment, the container 15 has an inner flange portion 25 and an outer flange portion 30, and slits 32 are arranged side by side in the circumferential direction between the inner flange portion 25 and the outer flange portion 30 via the connecting portion 33. Will be done. Further, the outer flange portion 30 is arranged above the inner flange portion 25 and can be displaced to the same height as the inner flange portion 25 by elasticity. As a result, when the lid 50 is heat-bonded to the upper surfaces of the inner flange portion 25 and the outer flange portion 30 to form the container with a lid 10, the lid 50 is urged by the outer flange portion 30. The outer flange portion 30 and the inner flange portion 25 may be substantially the same height due to elasticity, and the outer flange portion 30 may be slightly higher than the inner flange portion 25 due to elasticity.

When the connecting portion 33 is separated and the lid 50 is opened integrally with the outer flange portion 30, the engaging piece 29a and the engaging piece 29b are formed. At this time, the urging force of the outer flange portion 30 is released, and the outer engaging piece 29a descends. As a result, when the lid 50 is closed again, the outer engaging piece 29a elastically deforms in the vertical direction and engages with the inner engaging piece 29b in the vertical direction. Therefore, even if the container 15 is formed to be thin by vacuum forming or the like, the lid 50 and the container 15 can be engaged with each other at the time of resealing. Therefore, the cost of the resealable container with a lid 10 can be reduced.

Further, a recess 29 is provided between the inner flange portion 25 and the outer flange portion 30, and the slit 32 is arranged in the recess 29. As a result, the engaging piece 29a and the engaging piece 29b that are elastically deformed and engaged by the disconnection of the connecting portion 33 can be easily formed.

Further, the upper surface 30b of the outer flange portion 30 of the container 15 before the lid 50 is heat-bonded is inclined downward inward. As a result, the outer flange portion 30 rotates during thermal bonding of the lid 50, so that when the connecting portion 33 is disconnected, the tip of the outer engaging piece 29a is closer to the outer peripheral edge of the slit 32 before thermal bonding of the lid 50. Arranged inside. Therefore, the engaging piece 29a and the engaging piece 29b can be reliably engaged.

Further, the upper surface 25b of the inner flange portion 25 of the container 15 before the lid 50 is heat-bonded is inclined downward inward. As a result, the inner flange portion 25 rotates when the lid 50 is thermally bonded, so that the tip of the inner engaging piece 29b is displaced outward when the lid 50 is peeled off. Therefore, the engaging piece 29a and the engaging piece 29b can be more reliably engaged.

The inner flange portion 25 and the outer flange portion 30 of the container 15 before the lid 50 is heat-bonded may be arranged horizontally. At this time, when the connecting portion 33 is disconnected, the tip of the engaging piece 29a and the tip of the engaging piece 29b are arranged vertically, but the lid 50 is slightly displaced in the horizontal plane at the time of resealing, so that the lid 50 is engaged. The piece 29a and the engaging piece 29b can be engaged with each other.

Further, since the slits 32 arranged along the pair of long sides of the substantially rectangular inner flange portion 25 are curved inwardly, the engagement depth between the engaging piece 29a and the engaging piece 29b is formed on the long sides. You can make it shallow. Therefore, the lid 50 of the resealed container with lid 10 can be easily opened.

In the present embodiment, the opening 20a of the storage portion 20 may be formed in another shape (substantially square, polygonal, circular, etc.).

<Second Embodiment>
FIG. 10 is a top view showing the container 15 of the container with a lid 10 of the second embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 9 are designated by the same reference numerals. In this embodiment, a part of the shape of the slit 32 is different from that of the first embodiment. Other parts are the same as those in the first embodiment.

The slits 32 arranged along the corners facing the hinge portion 22 are formed in a corrugated manner. As a result, when the connecting portion 33 is disconnected, the tips of the engaging piece 29a and the engaging piece 29b are formed in a wavy shape.

When the lid 50 is resealed, the lid 50 is slightly displaced in the horizontal plane, so that the corrugated peaks at the tips of the engaging piece 29a and the engaging piece 29b overlap in the vertical direction. Therefore, the engagement piece 29a and the engagement piece 29b facing the hinge portion 22 can be more reliably engaged with each other to close the lid 50.

According to the present embodiment, the same effect as that of the first embodiment can be obtained. Further, since the corrugated slit 32 is provided at the corner portion facing the hinge portion 22, the lid 50 can be resealed more reliably.

<Third Embodiment>
FIG. 11 is a top view showing the container 15 of the container 10 with a lid according to the third embodiment. For convenience of explanation, the same parts as those in the second embodiment shown in FIG. 10 are designated by the same reference numerals. In this embodiment, many corrugated slits 32 are provided as compared with the second embodiment. Other parts are the same as those in the second embodiment. In the present embodiment, the corrugated slit 32 is provided at the corner portion excluding the hinge portion 22.

The inner flange portion 25 is formed in a substantially rectangular shape having corners on a curve, and a corrugated slit 32 is further provided along a pair of opposite corners of the inner flange portion 25. As a result, when the lid 50 is opened integrally with the outer flange portion 30, the connecting portion 33 is disconnected. Then, when the connecting portion 33 is disconnected, the tips of the engaging piece 29a and the engaging piece 29b are formed in a wavy shape.

When the lid 50 is resealed, the lid 50 is slightly displaced in the horizontal plane, so that the corrugated peaks at the tips of the engaging piece 29a and the engaging piece 29b overlap in the vertical direction. Therefore, at the corners other than the hinge portion 22, the engaging piece 29a and the engaging piece 29b that face each other can be more reliably engaged with each other to close the lid 50.

According to the present embodiment, the same effect as that of the second embodiment can be obtained.

<Fourth Embodiment>
FIG. 12 is a side sectional view showing the outer flange portion 30 and the inner flange portion 25 of the lid 50 of the container with lid 10 of the fourth embodiment before heat bonding. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 9 are designated by the same reference numerals. In this embodiment, a bent portion 34 is provided instead of the recess 29 as compared with the first embodiment. Other parts are the same as those in the first embodiment.

The inner flange portion 25 and the outer flange portion 30 are arranged horizontally, and the outer flange portion 30 is connected to the inner flange portion 25 via a bent portion 34 having an L-shaped cross section. As a result, the outer flange portion 30 is arranged above the inner flange portion 25. The bent portion 34 bends vertically from a horizontal portion arranged in the same plane as the inner flange portion 25. A slit 32 is formed in the horizontal portion of the bent portion 34.

FIG. 13 shows a side sectional view of the inner flange portion 25 and the outer flange portion 30 of the container with a lid 10 in which the lid 50 is heat-bonded to the container 15. When the lid 50 is heat-bonded, the outer flange portion 30 is elastically arranged at the same height as the inner flange portion 25, and the upper surface 25b of the inner flange portion 25 and the upper surface 30b of the outer flange portion 30 are arranged horizontally. As a result, the outer flange portion 30 urges the lid 50 upward. Further, the outer flange portion 30 rotates together with the bent portion 34, and the bent portion 34 is urged downward.

When the container 10 with a lid is opened, the connecting portion 33 (see FIG. 3) is separated, and the urging force of the outer flange portion 30 is released. As a result, the engaging piece 29a and the engaging piece 29b are formed by the bent portion 34, the tip of the outer engaging piece 29a is lowered, and the tip of the inner engaging piece 29b is raised. When the lid 50 is closed again, as shown by the alternate long and short dash line in the figure, the engaging piece 29a elastically deforms in the vertical direction to get over the engaging piece 29b and engage with the engaging piece 29b in the vertical direction. As a result, the lid 50 is held in the container 15, and the container with lid 10 can be resealed.

According to the present embodiment, the same effect as that of the first embodiment can be obtained. The outer flange portion 30 may be inclined as in the first embodiment.

<Fifth Embodiment>
FIG. 14 is a side sectional view showing the outer flange portion 30 and the inner flange portion 25 of the lid 50 of the container with lid 10 of the fifth embodiment before heat bonding. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 9 are designated by the same reference numerals. In this embodiment, a bent portion 35 is provided in place of the recess 29 as compared with the first embodiment. Other parts are the same as those in the first embodiment.

The inner flange portion 25 is arranged horizontally, and the outer flange portion 30 is continuously provided to the inner flange portion 25 via a bent portion 35 having an L-shaped cross section. As a result, the outer flange portion 30 is arranged above the inner flange portion 25. The bent portion 35 is bent so as to form an obtuse angle from a horizontal portion arranged in the same plane as the inner flange portion 25, and is arranged in the same plane as the outer flange portion 30. A slit 32 is formed in the horizontal portion of the bent portion 35.

FIG. 15 shows a side sectional view of the inner flange portion 25 and the outer flange portion 30 of the container with a lid 10 in which the lid 50 is heat-bonded to the container 15. When the lid 50 is heat-bonded, the outer flange portion 30 is elastically arranged at the same height as the inner flange portion 25, and the upper surface 25b of the inner flange portion 25 and the upper surface 30b of the outer flange portion 30 are arranged horizontally. As a result, the outer flange portion 30 urges the lid 50 upward. Further, the outer flange portion 30 rotates together with the bent portion 35, and the bent portion 35 is urged downward.

When the container 10 with a lid is opened, the connecting portion 33 (see FIG. 3) is separated, and the urging force of the outer flange portion 30 is released. As a result, the engaging piece 29a and the engaging piece 29b are formed by the bent portion 35, the tip of the outer engaging piece 29a is displaced, and the tip of the inner engaging piece 29b rises. When the lid 50 is closed again, as shown by the alternate long and short dash line in the figure, the engaging piece 29a elastically deforms in the vertical direction to get over the engaging piece 29b and engage with the engaging piece 29b in the vertical direction. As a result, the lid 50 is held in the container 15, and the container with lid 10 can be resealed.

According to the present embodiment, the same effect as that of the first embodiment can be obtained.

The present invention is not limited to the above-described embodiment, and various other modifications can be made.

According to the container of the present invention, slits 32 are arranged side by side in the circumferential direction between the inner flange portion 25 and the outer flange portion 30 arranged above the inner flange portion 25 via the connecting portion 33. Further, the outer flange portion 30 can be displaced to the same height as the inner flange portion 25 by elasticity. As a result, when the lid 50 of the resin film is heat-bonded to the inner flange portion 25 and the outer flange portion 30 to form the container with a lid 10, even if the container 15 is formed to be thin, the lid 50 and the container 15 are resealed. Can be engaged with. Therefore, the cost of the resealable container with a lid 10 can be reduced.

Further, according to the container with a lid 10 of the present invention, the lid 50 is heat-bonded to the inner flange portion 25 and the outer flange portion 30 which are elastically deformed and arranged at the same height. Further, when the lid 50 is opened integrally with the outer flange portion 30, a pair of engaging pieces 29a and 29b divided by a slit 32 are formed between the inner flange portion 25 and the outer flange portion 30. Then, when the lid 50 is closed again, the engaging pieces 29a and 29b engage with each other. As a result, even if the container 15 is formed to be thin, the lid 50 and the container 15 can be engaged with each other at the time of resealing, and the cost of the resealable container with a lid 10 can be reduced.

According to the present invention, it can be used for a container with a lid that is opened and closed by a lid.

10 Container with lid 15 Container 20 Storage part 20a Opening 20b Bottom wall 21 Protruding part 22 Hinge part 25 Inner flange part 25b Top surface 25c Protruding part 29 Recession 29a, 29b Engagement piece 30 Outer flange part 30b Top surface 31 Grip part 32 Slit 32a Inner surface 33 Connecting part 34, 35 Bending part 50 Lid 52, 53 Adhesive part

Claims (8)

A storage unit with an open top surface and
An annular inner flange portion protruding outward from the upper edge of the storage portion,
An annular outer flange portion connected to the outside of the inner flange portion, and an annular outer flange portion.
A plurality of slits arranged side by side in the circumferential direction via a separable connecting portion between the inner flange portion and the outer flange portion.
A container of a resin molded product provided with the above, wherein the outer flange portion is arranged above the inner flange portion and can be displaced to the same height as the inner flange portion by elasticity. The container according to claim 1, wherein a recess is provided between the inner flange portion and the outer flange portion, and the slit is arranged in the recess. The container according to claim 1 or 2, wherein the upper surface of the outer flange portion is inclined downward inward. The container according to any one of claims 1 to 3, wherein the upper surface of the inner flange portion is inclined downward inward. The container according to any one of claims 1 to 4, wherein at least a part of the slits is formed in a corrugated shape. The container according to claim 5, wherein a hinge portion having a slit spacing larger than that of the connecting portion is provided, and the corrugated slit is provided facing the hinge portion. The inner flange portion is formed in a substantially rectangular shape having curved corner portions, the hinge portion is provided along one of the pair of opposite corner portions, and the corrugated slit is provided along the other. The container according to claim 6. Claims 1 to claim that the inner flange portion is formed in a substantially rectangular shape, and the inner peripheral surface of the slit arranged along a pair of long sides of the inner flange portion is curved inwardly. The container according to any one of 6 .

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