Container and lidded container using the same

Abstract

To provide a lidded container allowing shaking-out of an appropriate amount of a content, and a container used therefor.SOLUTION: A container 15 includes: an annular inner flange part 30 formed outward protrudedly from the peripheral edge of an opening 17; an annular outer flange part 40 formed outward protrudedly from the periphery; and a flange connection part separably connecting an opening / closing part 40a of the outer flange part 40 with respect to the flange part 30. The flange connection part has multiple slits 60, 61, 62, and a flange connection part 50 breakably formed at a part between the slits 60 and 61, between the inner flange part 30 and the opening / closing part 40a of the outer flange part 40, and at a part from therebetween to an outer peripheral edge of the outer flange part 40.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a container and a covered container using the same, for example, a container having an opening for putting in and taking out contents such as food, and a covered container provided with a lid for covering the opening of the container. [Background technology]

[0002] Various types of lidded containers have been proposed. For example, the lidded container described in Patent Document 1 includes a resin molded container and a lid made of a resin film. The container has a storage section with an opening on the top surface and a flange section protruding outward from the upper edge of the storage section, and the flange section is provided with a protrusion protruding radially from the outer circumferential end. A ring-shaped frame is attached to the bottom surface of the lid, and an engagement claw is provided on the top wall of the frame that faces the bottom surface of the lid. The frame is injection molded integrally with the container, and the lower end of the engagement claw and the protrusion are connected via a film. The lid is thermally bonded to the top surface of the frame and the top surface of the flange section, and when the lid is opened, the lid is peeled off from the flange section and opened integrally with the frame. In addition, when the lid is closed, the engagement claw elastically deforms horizontally and engages with the protrusion of the container in the vertical direction. This allows the lidded container to be resealed (reclosed) after opening. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2014-502584 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the container with lid described in Patent Document 1, the entire opening must be opened when removing the contents from the container, making it necessary to use a tool such as a spoon. If the contents are in the form of powder or granules, it is possible to avoid using a tool such as a spoon by shaking the contents out of the container, but it is difficult to shake out an appropriate amount of the contents when the entire opening is open.

[0005] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a container with a lid that allows an appropriate amount of content to be shaken out, and a container used therefor. [Means for solving the problem]

[0006] In order to achieve the above object, a container according to a first aspect of the present invention is a container having an opening, an annular inner flange portion formed so as to protrude outward from a periphery of the opening; an annular outer flange portion formed so as to protrude outward from a periphery of the inner flange portion; a flange connection portion that detachably connects a portion of the outer flange portion to the inner flange portion, The flange connection portion has a plurality of slits between the inner flange portion and a portion of the outer flange portion, and between that portion and the outer peripheral edge of the outer flange portion, and a flange connecting portion formed to be breakable between the slits.

[0007] The container of the second invention is the container of the first invention, wherein a part of an outer peripheral portion of the outer flange portion is located higher than the inner flange portion and is elastically displaceable to the same height as the inner flange portion; The flange connection portion is characterized in that when a portion of the outer flange portion is separated from the inner flange portion, the inner flange portion and a portion of the outer flange portion form a pair of engaging pieces that can engage with each other at opposing portions via the slit.

[0008] The container of the third invention is characterized in that, in the first or second invention above, the inner flange portion and the outer flange portion form an approximately rectangular shape having curved corner portions, and the slit is located at one corner portion of the approximately rectangular shape.

[0009] The container of the fourth invention is characterized in that, in the above-mentioned third invention, the slit located at the corner portion has a wavy shape and is located along a straight line or a curved line.

[0010] The container of the fifth invention is characterized in that, in the third or fourth invention above, a tear tab which serves as a grip when separating a part of the outer flange portion from the inner flange portion is provided at the corner portion where the slit is located.

[0011] The container of the sixth invention is characterized in that, in any one of the first to fifth inventions above, the inner flange portion, the outer flange portion, and the flange connection portion are integrally formed as a resin molded body.

[0012] The container of the seventh invention is characterized in that, in the sixth invention described above, when a portion of the outer flange portion is separated from the inner flange portion due to fracture at the flange connection portion, a protrusion is formed at the fractured portion of at least one of the inner flange portion and the portion of the outer flange portion, enabling engagement between the inner flange portion and the portion of the outer flange portion.

[0013] A lidded container according to an eighth aspect of the present invention comprises a container according to any one of the first to seventh aspects of the present invention, and a lid bonded to the inner flange portion and the outer flange portion so as to cover the opening, When a portion of the outer flange portion is separated from the inner flange portion due to breakage at the flange connection portion, the lid is separated from the inner flange portion together with the portion of the outer flange portion, resulting in an opened state. Effect of the Invention

[0014] According to the present invention, a portion of the outer flange portion is detachably connected to the inner flange portion at the flange connection portion, thereby making it possible to realize a lidded container that allows an appropriate amount of contents to be shaken out, and a container used therefor. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is an assembled perspective view showing one embodiment of a container with a lid. [Diagram 2] FIG. 2 is an exploded perspective view showing the lidded container of FIG. 1. [Diagram 3] 2 is a top view showing the lidded container of FIG. 1 in an unopened state. FIG. [Figure 4] 2 is a top view showing the container with lid of FIG. 1 in an open state. FIG. [Diagram 5] Cross-sectional view taken along line A-A' in Figure 3. [Figure 6] 2 is an enlarged cross-sectional view showing the unopened state, the half-opened state, and the resealed state near the opening tab of the lidded container of FIG. 1. [Figure 7] FIG. 2 is a schematic diagram showing the state in which the contents are being shaken out of the lidded container of FIG. 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, a container according to an embodiment of the present invention and a lidded container using the same will be described with reference to the drawings. Note that the same or corresponding parts in the specific examples will be designated by the same reference numerals, and duplicated explanations will be omitted as appropriate.

[0017] The schematic structure of a lidded container 10 according to one embodiment is shown in the assembled perspective view of Fig. 1 and the exploded perspective view of Fig. 2. As shown in Fig. 2, the lidded container 10 includes a container 15 having an opening 17 for inserting and removing the contents, and a lid 20 for covering the opening 17. The container 15 has a storage section 16 in which the contents are stored, an annular inner flange section 30 formed so as to protrude outward from the periphery of the opening 17, and an annular outer flange section 40 formed so as to protrude outward from the periphery of the inner flange section 30. The contents to be stored in the storage section 16 are not particularly limited, but specific examples include powdered or granular seasonings such as salt, pepper, shichimi pepper, furikake, and other granular foods; tablet snacks, nuts, dried fruits, and other granular foods.

[0018] The container 15 is a resin molded body made of a thermoplastic resin such as polypropylene (PP), and is formed thin by a molding method such as injection molding or vacuum molding. The lid 20 is made of a resin film and has a thermal adhesive layer on one side. The thermal adhesive layer thermally bonds the lid 20 to the entire upper surfaces of the inner flange portion 30 and the outer flange portion 40. Therefore, by thermally bonding the lid 20 to the inner flange portion 30 and the outer flange portion 40, the storage portion 16 containing the contents can be sealed. The lid 20 is not limited to a resin film, and may be a multi-layered base material combining layers made of paper, metal foil, etc., and an adhesive may be used instead of the thermal adhesive layer. In addition, when gas barrier properties are required, an aluminum foil layer or a vapor deposition film layer may be provided as an intermediate layer of the lid 20.

[0019] The opening 17, the inner flange portion 30, and the outer flange portion 40 are generally rectangular (assumed to be generally square here) with curved corners, and are generally similar to one another. At one corner, a tear tab 41, which serves as a grip when opening, is formed so as to protrude outward from the edge of the outer flange portion 40. The lid 20 is also thermally bonded to the tear tab 41, so that when the tear tab 41 is held together with the lid 20 and a part of the outer flange portion 40 is separated from the inner flange portion 30, the lidded container 10 is in an opened state, which will be described later.

[0020] Fig. 3 shows a top view of container 15 when container 10 with lid is in an unopened state, and Fig. 4 shows a top view of container 15 when container 10 with lid is in an opened state. Fig. 5 shows a cross-sectional view taken along line A-A' in Fig. 3, and Fig. 6 shows the vicinity of opening tab 41 of container 10 with lid as a cross-sectional structure of the same portion as Fig. 5. In Fig. 6, (A) shows container 10 with lid in an unopened state (a sealed state in which lid 20 is heat-bonded to container 15), (B) shows container 10 with lid in the middle of being opened, and (C) shows container 10 with lid in a resealed state.

[0021] 3, the storage section 16 of the container 15 has a bottom wall 18 formed in a substantially rectangular shape similar to the opening 17. A substantially rectangular protruding section 19 protruding upward (toward the opening 17) is formed in the center of the bottom wall 18 in order to improve the strength of the storage section 16. As described above, the upper part of the storage section 16 is formed with an annular inner flange section 30 protruding outward from the periphery of the opening 17, and an annular outer flange section 40 is formed protruding outward from the periphery of the inner flange section 30.

[0022] 3, the container 15 is provided with a plurality of slits 60, 61, 62 between the inner flange portion 30 and a part (opening / closing portion) 40a of the outer flange portion 40, and between that portion and the outer peripheral edge of the outer flange portion 40, and a flange connecting portion 50 formed in a breakable manner between the slits 60, 61. The slit 60 is located at one of the corners of a substantially rectangular shape formed by the inner flange portion 30 and the outer flange portion 40, and the flange connecting portion 50 is located at both ends of the slit 60.

[0023] The slits 60-62 and the flange connection portion 50 are arranged symmetrically with respect to a diagonal line (A-A' is a part of the diagonal line) passing through the tear tab 41 in the substantially rectangular inner flange portion 30 and outer flange portion 40. Therefore, there are two flange connection portions 50, one slit 60, and two slits 61 and 62. The container 15 has the inner flange portion 30, the outer flange portion 40, and the flange connection portion 50 as an integrally formed resin molded body, and the slits 60-62 and the flange connection portion 50 constitute a flange connection portion that separably connects the opening / closing portion 40a, which is a part of the outer flange portion 40, to the inner flange portion 30. The slits 61 and 62 are connected in an L-shape, but a flange connection portion may be further provided between the slits 61 and 62, or a flange connection portion may be further provided in the middle of the slits 61 or 62.

[0024] As described above, the inner flange portion 30 and the outer flange portion 40 form a substantially rectangular shape having curved corners. In the substantially rectangular shape, the tear tab 41 is disposed at one of the curved corners, and the slit 60 is located at the corner. The slit 60 has a wavy line shape and is located along a straight line (a straight line perpendicular to a diagonal line passing through the tear tab 41). The flange connection portion 50 is located on both sides of the slit 60 (i.e., between the slit 61). The slit 60 having a wavy line shape may be formed so as to be located along a curve. Also, a plurality of slits having a straight line or a curved line shape may be disposed, and the flange connection portion may be formed between the slits.

[0025] The slit 60 is formed in a wavy shape by cutting the resin sheet constituting the container 15 with a wave blade (if a linear shape is to be formed, the cut is made with a straight blade). The flange connection parts 50 located on both sides of the slit 60 are formed with a slit length that allows them to be torn apart by hand by stopping the blade when cutting the resin sheet. The slits 61 and 62 are also formed by cutting with a blade according to each shape, and the flange connection parts may be appropriately formed by stopping the blade at that time.

[0026] As shown in Figs. 3 and 5, the outer peripheral portion of the inner flange portion 30 and the inner peripheral portion of the outer flange portion 40 (including the opening / closing portion 40a) form a recess 35. As shown in Fig. 3, the entire slits 60 and 61, a part of the slit 62, and two flange connecting portions 50 are arranged in the recess 35. In addition, the inner flange portion 30 is formed with a protruding portion 31 along the inner periphery of the recess 35 for thermal bonding of the lid 20 and reinforcement of the inner flange portion 30. The protruding portion 31 has an upwardly convex shape (Fig. 5) and forms a rectangle similar to the opening 17 (Fig. 3). The recess 35 is formed continuously on the outer peripheral side of the protruding portion 31, and the outer peripheral portion of the outer flange portion 40 is formed continuously on the outer peripheral side of the recess 35.

[0027] As shown in Fig. 5, the opening / closing portion 40a, which is part of the outer flange portion 40 before the lid 20 is thermally bonded, is inclined so that the outer peripheral portion is located upward, and the width W of the recess 35 is larger than the depth D (W>D). Since the depth D is small, the recess 35 can be easily formed during the molding process of the container 15. In addition, the inclination angle β of the side wall 42 on the outer peripheral side of the recess 35 is larger than the inclination angle γ of the outer peripheral portion of the outer flange portion 40. This allows the outer flange portion 40, including the opening / closing portion 40a, to be displaced to the same height as the inner flange portion 30 with appropriate elasticity.

[0028] Since the container 15 is formed to be thin, as described above, the outer peripheral portion of the opening / closing portion 40a, which is a part of the outer flange portion 40, is located above the inner flange portion 30 (FIG. 5), and can be displaced to the same height as the inner flange portion 30 due to elasticity (FIG. 6(A)). When the lid 20 is placed on the container 15 so as to cover the opening 17, and the lid 20 is pressed and heated so that the opening / closing portion 40a of the outer flange portion 40 and the inner flange portion 30 are at the same height, the thermal adhesive layer of the lid 20 melts, and the lid 20 is thermally bonded to the protruding portion 31 of the inner flange portion 30 and the outer peripheral portion of the outer flange portion 40 at the adhesive portions 34, 44 as shown in FIG. 6(A). As a result, the storage portion 16 containing the contents is sealed, and the lid 20 is held in a state in which it is biased upward by the outer flange portion 40. The thermal adhesive layer is provided on the entire lower surface of the lid 20, but only the adhesive portions 34, 44, which are the thermally bonded portions, are shown in FIG. 6.

[0029] When the opening tab 41 of the lidded container 10 (FIGS. 1 and 6(A)) is pinched and pulled, the flange connection portion 50 between the slits 60, 61 (FIG. 3) is broken and the adhesive portion 34 (FIG. 6(A)) is peeled off, and the lidded container 10 enters an opened state (FIGS. 6(B), 4). In other words, when the opening / closing portion 40a of the outer flange portion is separated from the inner flange portion 30 due to the breaking at the flange connection portion 50, the lid 20 is separated from the inner flange portion 30 together with the opening / closing portion 40a of the outer flange portion, and enters an opened state. At this time, the opening / closing portion 40a of the outer flange portion 40 is opened together with the lid 20, and the lid 20 is folded at a position near the slit 62 (the position indicated by the two-dot chain line in FIG. 4) (FIGS. 3 and 4).

[0030] The folding position of the lid 20 corresponds to the boundary between the adhesive portion to the opening / closing portion 40a and the adhesive portion to the remaining outer flange portion 40 (the portion where the lid 20 remains fixed together with the inner flange portion 30 at the adhesive portion 34). Therefore, the opening / closing portion 40a is connected to the remaining outer flange portion 40 only by the lid 20, and can rotate about the folding position. By making the opening / closing portion 40a rotatable in this manner, a part of the opening 17 that was entirely covered by the lid 20 opens, and the lidded container 10 enters an open state in which the contents in the storage portion 16 can be removed.

[0031] It is preferable that the opening direction is the direction of a diagonal line (A-A' is part of the diagonal line) passing through the tear tab 41, and stable opening can be achieved by pulling the tear tab 41 along the diagonal line passing through the tear tab 41. Also, by adding slits 61, 62 via the flange connection portion, an opening state in which the opening range of the opening 17 is further widened can be configured, making it possible to obtain multiple stages of opening states.

[0032] FIG. 7 shows a state in which granular food F (contents) is being shaken out of the container with lid 10. In a full-open type container, the entire opening is opened when removing the contents, so a tool such as a spoon is required. In contrast, in this container with lid 10, the opening / closing part 40a, which is a part of the outer flange part 40, is separably connected to the inner flange part 30 by a flange connection part (flange connection part 50, etc.), so that in the open state, the opening part 17 is partially restricted by the lid 20, making it possible to shake out an appropriate amount of food F. Since the food F can be shaken out of the container with lid 10, there is no need to use a tool such as a spoon. When there is only a little food F left, the lid 20 may be peeled off only from the opposite side of the opening tab 41.

[0033] When the opening / closing portion 40a of the outer flange portion 40 is separated from the inner flange portion 30 by breaking at the flange connection portion 50 (FIG. 3), the engaging pieces 33, 43 are formed as shown in FIG. 6(B). FIG. 6(B) shows a cross section of line A-A' at the slit 60 (FIG. 3), but the engaging pieces 33, 43 having a similar cross section are also formed at the slit 61. That is, the opening / closing portion 40a of the inner flange portion 30 and the outer flange portion 40 form a pair of engaging pieces 33, 43 that can be engaged with each other at the portions facing each other through the slits 60, 61. At this time, the biasing force of the outer flange portion 40 is released, and the tip of the engaging piece 43 is displaced toward the inner circumference. The engaging piece 43 can rotate around the bending position of the lid 20, but since the depth D (FIG. 5) of the recess 35 is small, the horizontal displacement of the engaging piece 43 is also small.

[0034] When the tear tab 41 is pulled to break the flange connection portion 50, the engagement pieces 33, 43 are formed and protrusions 53, 54 are generated, as shown in Figures 4 and 6(B). Here, the case is shown in which the protrusion 53 is generated at the broken portion of the inner flange portion 30 and the protrusion 54 is generated at the broken portion of the outer flange portion 40, but the protrusions 53, 54 will be generated at the broken portion of at least one of the inner flange portion 30 and the outer flange portion 40.

[0035] When the opening / closing portion 40a of the outer flange portion 40 and the lid 20 are closed again by pinching the tearing tab 41, the engaging piece 43 elastically deforms in the vertical direction, climbing over the engaging piece 33, and vertically engaging with the engaging piece 33, as shown in Fig. 6(C). This allows the lid 20 and the opening / closing portion 40a of the outer flange portion 40 to be held by the inner flange portion 30, thereby achieving resealing of the lidded container 10. Even if the container 15 is formed to be thin, the inner flange portion 30 and the opening / closing portion 40a of the outer flange portion 40 can be engaged during resealing, thereby realizing resealing at low cost.

[0036] During the resealing, not only can the engaging pieces 33 and 43 engage with each other, but also the protrusions 53 and 54, the protrusions 53 and 43, and the protrusions 54 and 33 can engage with each other. In this way, the inner flange portion 30 and the opening / closing portion 40a of the outer flange portion 40 can be easily engaged by the protrusions 53 and 54, allowing for more stable resealing. If the contents do not need to be sealed, resealing is possible without any problems even if the opening / closing portion 40a of the outer flange portion 40 is only loosely engaged with the inner flange portion 30.

[0037] As described above, when the opening / closing portion 40a of the outer flange portion 40 is separated from the inner flange portion 30 due to breaking at the flange connection portion 50, protrusions 53, 54 are formed at the broken portion of at least one of the inner flange portion 30 and the opening / closing portion 40a of the outer flange portion 40, enabling effective engagement between the inner flange portion 30 and the outer flange portion 40. Therefore, by using the container 15, a lidded container 10 that can be resealed stably and at low cost can be realized.

[0038] The flange connecting parts 50 located at both ends of the slit 60 are arranged symmetrically with respect to a diagonal line (A-A' in FIG. 3 is a part of the diagonal line) passing through the tear tab 41. In this arrangement, if the tear tab 41 is pulled along the diagonal line, the force applied to each flange connecting part 50 is uniform, so that the protrusions 53, 54 are easily generated. As a result, engagement is facilitated by a slight deviation in the relative position in the lateral direction between the inner flange part 30 and the outer flange part 40. For the same reason, it is preferable that the flange connecting parts 50 are arranged perpendicular to the diagonal line, as in the container 15. In addition, when the flange connecting parts 50 are located at both ends of the slit 60 extending perpendicular to the diagonal line passing through the tear tab 41, the protrusions 53, 54 are easily caught by the engagement pieces 33, 43, and more stable resealing is possible.

[0039] In the container 15 (Figs. 3 and 4), the slit 60 has a wavy shape, so the engagement pieces 33, 43 formed by breaking the flange connection portion 50 also have a wavy shape. When resealing, a slight deviation occurs in the relative lateral positions of the inner flange portion 30 and the outer flange portion 40, so the wavy peaks of the engagement pieces 33, 43 overlap and engage in the vertical direction. This allows the engagement pieces 33, 43 to be resealed more reliably and stably.

[0040] As described above, when the slit 60 has a wavy shape, the projections 53, 54 can easily engage with the engagement pieces 33, 43, and when multiple flange connecting portions 50 are provided, the multiple projections 53, 54 facilitate engagement with the engagement pieces 33, 43. Therefore, in either case, more stable resealing is possible.

[0041] The width of the flange connection portion 50 (in other words, the distance of the blade stop) is preferably 0.5 to 0.8 mm. By forming the flange connection portion 50 with a width of 0.5 to 0.8 mm, it becomes easier to create protrusions 53, 54 that are well balanced between ease of engagement and ease of opening.

[0042] Polypropylene is preferred as the material for the container 15. The use of polypropylene has the advantage that it stretches when broken, and tends to produce protrusions 53, 54. Materials that tend to produce protrusions 53, 54 include multilayer sheets (PP / EVOH / PP) when barrier properties are required, and A-PET (unstretched amorphous PET) when transparency is required.

[0043] When opening the package after resealing, the opening tab 41 can be pinched and pulled in the same manner as when opening the package. Since the engagement pieces 33, 43 are symmetrically positioned with respect to a diagonal line passing through the opening tab 41, pulling the opening tab 41 along the diagonal line makes it possible to open the package after resealing more stably. As described above, the horizontal displacement of the engagement piece 43 is small, so the engagement width between the engagement piece 43 and the engagement piece 33 is small. Therefore, it is possible to easily open the package after resealing. In addition, since the recess 35 is shallow (W>D), it is possible to reduce the engagement width between the engagement piece 43 and the engagement piece 33 when resealing. Therefore, it is possible to easily open the package after resealing, as described above. [Explanation of symbols]

[0044] 10 Container with lid 15 Container 16 Storage area 17 Opening 18 Bottom wall 19 Protrusion 20 Lid 30 Inner flange 31 Protrusion 33 Engagement piece 34 Adhesive part 35 Recess 40 Outer flange 40a Opening and closing part (part of outer flange) 41 Opening Tab 42 Side wall 43 Engagement piece 44 Adhesive part 50 Flange connection part (flange connection part) 53,54 protrusion 60, 61, 62 Slits (flange connection) F Food (contents)

Claims

1. A container with a lid comprising a container having an opening and a lid for covering the opening, The container has an annular inner flange portion formed so as to protrude outward from a periphery of the opening; an annular outer flange portion formed so as to protrude outward from a periphery of the inner flange portion; a flange connection portion that detachably connects a portion of the outer flange portion to the inner flange portion, the flange connection portion has a plurality of slits between the inner flange portion and a part of the outer flange portion and between the slits and an outer peripheral edge of the outer flange portion, and the flange connection portion has a flange connecting portion formed to be breakable between the slits; the inner flange portion and the outer flange portion form a substantially rectangular shape having curved corners, and one of the plurality of slits is located at only one of the four corners of the substantially rectangular shape, and none of the plurality of slits is located at any of the remaining three corners, The lid is bonded to the inner flange portion and the outer flange portion so as to cover the entire surface of the opening, A lidded container characterized in that when a portion of the outer flange portion is separated from the inner flange portion due to fracture at the flange connection portion, the portion of the outer flange portion remains connected to the remaining outer flange portion only by the lid, and the lid is folded so as to be separated from the inner flange portion together with the portion of the outer flange portion, thereby opening only a portion of the opening that was entirely covered by the lid, and the container is in an opened state within an area that includes the one corner portion and does not include any other corner portions.

2. 2. The container with lid according to claim 1, wherein the flange connection portions are located on both ends of a slit located at the corner portion.

3. 3. The container with lid according to claim 2, wherein the slit located at the corner portion has a wavy shape and is located along a straight line.

4. a tear tab that is a gripping member for separating a part of the outer flange portion from the inner flange portion is provided at a corner portion where the slit is located; 4. A container with a lid according to claim 2 or 3, wherein all of said slits and said flange connection portions are arranged symmetrically with respect to a diagonal line passing through said tear tab.

5. 5. The container with lid according to claim 1, wherein the inner flange portion, the outer flange portion and the flange connecting portion are an integrally formed resin molded body.

6. A lidded container as described in claim 5, characterized in that when a portion of the outer flange portion is separated from the inner flange portion due to fracture at the flange connection portion, a protrusion is formed at the fractured portion of at least one of the inner flange portion and the portion of the outer flange portion, enabling the inner flange portion and the portion of the outer flange portion to engage with each other.

7. A container having an opening formed therein, an annular inner flange portion formed so as to protrude outward from a periphery of the opening; an annular outer flange portion formed so as to protrude outward from a periphery of the inner flange portion; a flange connection portion that detachably connects a portion of the outer flange portion to the inner flange portion, the flange connection portion has a plurality of slits between the inner flange portion and a part of the outer flange portion and between the slits and an outer peripheral edge of the outer flange portion, and the flange connection portion has a flange connecting portion formed to be breakable between the slits; the inner flange portion and the outer flange portion form a substantially rectangular shape having curved corners, and one of the plurality of slits is located at only one of the four corners of the substantially rectangular shape, and none of the plurality of slits is located at any of the remaining three corners, The flange connection portion is located at both ends of the slit located at the corner portion, a tear tab that is a gripping member for separating a part of the outer flange portion from the inner flange portion is provided at a corner portion where the slit is located; a part of an outer circumferential portion of the outer flange portion is located above the inner flange portion and is elastically displaceable to the same height as the inner flange portion; A container characterized in that when a portion of the outer flange portion is separated from the inner flange portion at the flange connection portion, the inner flange portion and a portion of the outer flange portion form a pair of engaging pieces that can engage with each other at opposing portions across the slit.

8. A container according to claim 7, and a lid bonded to the inner flange portion and the outer flange portion so as to cover the opening, A lidded container characterized in that when a portion of the outer flange portion is separated from the inner flange portion due to fracture at the flange connection portion, the lid is separated from the inner flange portion together with a portion of the outer flange portion, resulting in an open state within an area that includes the one corner portion but does not include any other corner portions.

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