container

Abstract

To provide a container which can be manufactured at a high yield, while maintaining or improving a function required for a hole opening function part.SOLUTION: A container includes: a container body 10 having a bottom wall surface 11 and a side wall surface 12; a recess part 11a provided at the bottom wall surface 11; and a hole opening function part 20 for providing an air hole 30. The hole opening function part 20 includes: a protrusion piece 21 in which a base part 21a is provided in the recess part 11a, and a tip part 21b protrudes from the bottom wall surface 11; a connection part 22 for connecting part of the base part 21a and an inner peripheral surface of the recess part 11a; and a breaking scheduled part 23 for forming a bottom part of the recess part 11a, and provided in the periphery of the base part 21a excluding one part. The connection part 22 is formed in such a manner that it is thinner than the wall thickness of the bottom wall surface 11 and it is thicker than the wall thickness of the breaking scheduled part 23, and the connection part 22 includes: a wide width part 22a which is wide in the in-plane direction of the bottom wall surface 11 and connected to the inner peripheral surface of the recess part 11a; and a narrow width part 22b which is narrower than the wide width part 22a and connected to the base part 21a of the protrusion piece 21.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a container, and more particularly to a container in which an air hole for removing contents can be formed in the bottom wall surface of the container body. [Background technology]

[0002] Containers capable of opening an air hole in the bottom wall of the container body to allow the contents to be removed are known as containers filled with pudding, jelly, agar, egg tofu, sesame tofu, etc. In this type of container, a protruding piece protruding from the bottom wall of the container body is generally pushed down and broken off from its base, thereby removing a portion of the bottom wall together with the base and opening an air hole in the bottom wall.

[0003] For example, the container disclosed in Patent Document 1 has a bottom wall portion provided with a thin annular portion around the base of the protruding piece, and the thickness of the thin annular portion is smaller than the thickness of the bottom wall portion so that it is easy to break, and the width of the thin annular portion is set to a value that allows for slight bending deformation, providing a hole-opening function part. In this container, the gap between the bottom wall portion and the base of the protruding piece can be easily broken compared to a container without a thin annular portion. Furthermore, because the thin annular portion breaks after bending deformation, it acts as a cushion, reducing the impact transmitted to fingers and other parts when opening the air hole, preventing unpleasant resistance. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-51598 Summary of the Invention [Problem to be solved by the invention]

[0005] Puddings and other snacks are often enjoyed as snacks by infants and children. Therefore, it is necessary that the air hole be easily opened even by small children. After the air hole is opened, the protruding piece does not completely separate from the bottom wall, but rather a portion of it must remain connected to the bottom wall. Furthermore, it is necessary to prevent the air hole from being inadvertently opened in the bottom wall during manufacturing and distribution. For this reason, in the container disclosed in Patent Document 1, the thickness and width of the annular thin-walled portion are designed to within 0.1 mm, for example, making it difficult to mass-produce such containers with a high yield.

[0006] Therefore, an object of the present invention is to provide a container that can be manufactured with a high yield while maintaining or improving the functionality required of the perforation functional portion. [Means for solving the problem]

[0007] In order to solve the above problem, the container of the present invention comprises a container body having a bottom wall surface and side wall surfaces that define a storage space for accommodating contents, a recess provided on the bottom wall surface that is recessed in the thickness direction, and an opening function portion for opening an air hole that penetrates the recess in the thickness direction, wherein the opening function portion comprises a protruding piece whose base is disposed within the recess and whose tip protrudes toward the outside of the bottom wall surface, a connecting portion that connects a part of the base to the inner surface of the recess, and a breakable portion that forms the bottom of the recess and is provided around the base except for the part, wherein the connecting portion is formed thinner than the thickness of the bottom wall surface and thicker than the thickness of the breakable portion, and the connecting portion has a wide portion that is wide in the in-plane direction of the bottom wall surface and is connected to the inner surface of the recess, and a narrow portion that is narrower than the wide portion and is connected to the base of the protruding piece.

[0008] In the container of the present invention, it is preferable that the wide portion of the connecting part is widened from the narrow portion toward the inner surface of the recess so as to draw an arc that is convex outward in the in-plane direction of the bottom wall surface.

[0009] In the container according to the present invention, it is preferable that the recessed portion has an opening at the lower surface of the bottom wall surface and is recessed toward the storage space.

[0010] In the container according to the present invention, it is preferable that the projecting piece has a flat surface portion or a concave curved surface portion recessed toward the connecting portion on the side opposite to the connecting portion. [Effects of the Invention]

[0011] According to the container of the present invention, when forming a hole-opening functional portion for opening an air hole in the bottom wall of the container, the base of the protruding piece is disposed in a recess provided in the bottom wall. Instead of providing a thin-walled breakable portion around the entire periphery of the base, a portion of the base is connected to the inner circumferential surface of the recess by a connecting portion that is thicker than the breakable portion and thinner than the bottom wall. Furthermore, the connecting portion has a wide portion and a narrow portion, with the wide portion connected to the inner circumferential surface of the recess and the narrow portion connected to the base of the protruding piece. This configuration allows the load to be concentrated on the side of the protruding piece where the force for pushing it down is applied (the side facing the connecting portion across the protruding piece). Therefore, with this container, breaking of the breakable portion can be initiated with a smaller force than in a container without a connecting portion, and the periphery of the protruding piece can be quickly broken. Furthermore, by connecting the connecting portion within the recess to a part of the base of the protruding piece and the inner peripheral surface of the recess, and connecting the connecting portion to the inner peripheral surface over a wide area by the wide portion and connecting the connecting portion to the base over a narrow area by the narrow portion, the breakable portion is secured widely around the base, and it is possible to prevent the breakable portion from breaking or the inadvertent creation of an air hole when removing the container from the mold, etc. Therefore, compared to conventional equivalent containers, it is possible to provide a container that can be manufactured with a high yield while maintaining or improving the functionality required of the perforation functional portion. [Brief explanation of the drawings]

[0012] [Figure 1] 1A and 1B are diagrams showing an embodiment of a container according to the present invention, in which (a) is a front view (partial cross-sectional view) and (b) is a bottom view, where the cross-sectional portion of (a) corresponds to the A-A' cross-section of (b). [Figure 2] (a) is a top view of the container shown in Figure 1, and (b) is a side view (partial cross-sectional view) of the container, where the cross-sectional portion of (b) corresponds to the B-B' cross section of Figure 1(b). [Figure 3] (a) is an oblique view showing the container shown in Figure 1 placed upside down, (b) is a partially enlarged view showing the hole opening function part, and (c) is a partially enlarged view showing the state in which an air hole is opened by the hole opening function part. [Figure 4] 1(b) is an enlarged view showing the configuration of the perforation function part shown in FIG. 1(b), and FIG. 1(b) is a cross-sectional view taken along CC' in FIG. 1(a), where CC' cross-section corresponds to A-A' cross-section in FIG. 1(b). [Figure 5] 4(a) is a view of the hole-opening function part shown in FIG. 4(a) when viewed in the direction from C to C', and FIG. 4(b) is a cross-sectional view taken along the line DD' in FIG. 4(a). DETAILED DESCRIPTION OF THE INVENTION

[0013] An embodiment of a container according to the present invention will be described with reference to the drawings. 1(a) shows a front view (partial cross section) of a container 100 of this embodiment, and (b) shows a bottom view of the container 100. The container 100 comprises a container body 10 and, on a bottom wall surface 11 of the container body 10, a hole-opening functional part 20 for opening an air hole 30 (see FIG. 3(c)) for removing the contents filled in the container body 10. The container body 10 and the hole-opening functional part 20 are integrally molded and can be molded from a resin used for various container packaging materials, such as a polypropylene (PP)-based resin, a polystyrene (PS)-based resin, or a polyethylene terephthalate (PET)-based resin.

[0014] The configuration of each part will be described in more detail below. In the following, the up-down direction represents a relative positional relationship and refers to a direction along the central axis O of the container body 10. For example, when the container 100 is placed in the upright position shown in Fig. 1, the side where the bottom wall surface 11 is located is referred to as the lower side, and the side where the top surface 13 is located is referred to as the upper side. Furthermore, the radial direction refers to a direction perpendicular to the central axis O, and the in-plane direction refers to the horizontal direction when the target surface (for example, the bottom wall surface 11) is assumed to be a horizontal plane.

[0015] First, the container body 10 will be described with reference to Figures 1 to 3. As shown in Figure 1(a), the container body 10 has the bottom wall surface 11 and side wall surface 12, which define a storage space for storing contents. The top surface 13 of the container body 10 is open, and contents can be filled in or removed from the top surface 13. As contents, for example, foods such as pudding, jelly, agar, egg tofu, sesame tofu, etc., which are filled in liquid form into the container body 10 during the manufacturing process and then solidify by heating or the like, can be suitably stored.

[0016] In the container 100 of this embodiment, as shown in Figures 1 to 3, the bottom wall surface 11 is flower-shaped, and the lower part 12a of the side wall surface 12 is flower-shaped in plan view (when viewed from a direction perpendicular to the axial direction) and expands in diameter axially upward. The upper part 12b of the side wall surface 12 is circular in plan view and expands in diameter axially upward. The upper end of the lower part 12a of the side wall surface 12 and the lower end of the upper part 12b are joined by a middle bottom wall surface 15 (see Figures 1(b) and 2(a)).

[0017] The top surface 13 is provided with a flange portion 13a that protrudes radially outward from the upper end of the upper portion 12b of the side wall surface 12. The container body 10 can be sealed by covering the top surface 13 with a sealing material (not shown) such as an aluminum vapor deposition film or a resin film and thermocompressing the sealing material to the flange portion 13a.

[0018] As shown in Figures 1(a) and 2(b), a leg frame wall 14 is provided on the underside of the bottom wall 11. In plan view, the leg frame wall 14 has a flower-shaped frame shape that is slightly smaller than the bottom wall 11 as shown in Figure 1(b), and protrudes downward from the inside of the outer edge of the bottom wall 11. The protrusion length of the leg frame wall 14 from the bottom wall 11 is longer than the protrusion length L (see Figure 4(b)) of the protruding piece 21 from the bottom wall 11. Furthermore, when the container bodies 10 are stacked, the leg frame wall 14 of the upper container body 10 abuts against the upper surface of the bottom wall 11 of the other container body 10 below, and the tip of the protruding piece 21 of the perforation function portion 20 is separated from the bottom wall 11 of the other container body 10, so that no force is applied to the protruding piece 21 during stacking.

[0019] Next, the hole-opening function section 20 will be described mainly with reference to Figures 3 to 5. Figure 3(a) shows a state in which the container body 10 is turned upside down from the upright position shown in Figure 1(a) so that the top surface 13 is positioned axially downward. As shown in Figure 3, a recess 11a is provided on the outer surface (lower surface) of the bottom wall surface 11, recessed in the thickness direction, i.e., toward the storage space. The hole-opening function section 20 is provided within this recess 11a. In other words, the recess 11a is a planned air hole opening region where the air hole 30 (Figure 3(c)) is opened by the hole-opening function section 20.

[0020] As shown in Figures 3 to 5, the hole-opening function portion 20 has a base 21a arranged within the recess 11a, a protruding piece 21 whose tip 21b protrudes axially toward the outside of the bottom wall surface 11, a connecting portion 22 connecting a part of the base 21a to the inner surface of the recess 11a, and a breakable portion 23 that forms the bottom of the recess 11a and is provided around the base 21a except for the part where the base 21a and the connecting portion 22 are connected.

[0021] As shown in Fig. 4(a), the hole-opening function part 20 has an axisymmetric shape in a plan view. The axis of symmetry is shown as a line CC' in Fig. 4(a). The line CC' corresponds to the line A-A' shown in Fig. 1(b).

[0022] When the protruding piece 21 is pushed down along the straight line C-C' from the "C" side (the side farther from the central axis O) toward the "C'" side (the side closer to the central axis O) where the connecting portion 22 is provided, an air hole 30 (FIG. 3(c)) is opened in the bottom wall surface 11. Hereinafter, the side of the protruding piece 21 that comes close to the bottom wall surface 11 when the protruding piece 21 is pushed down, i.e., the side of the protruding piece 21 that is closer to the central axis O, will be referred to as the "pushing-down portion 21c."

[0023] 3 to 5, protruding piece 21 is formed as a tapered round rod overall, but on the opposite side of pushing-down portion 21c, i.e., the side of protruding piece 21 farther from central axis O, there is provided flat portion 21d extending from base portion 21a to tip portion 21b. By providing flat portion 21d, when protruding piece 21 is pushed down with a finger or the like, a large contact area between the finger or the like and protruding piece 21 can be ensured, thereby preventing pain in the finger or the like. However, instead of flat portion 21d, this portion may be a concave curved portion that is concave toward pushing-down portion 21c so as to conform to the convex shape of the finger.

[0024] As shown in Figures 3(b) and 4(a), the connecting portion 22 has a wide portion 22a that connects to the inner circumferential surface of the recess 11a, and a narrow portion 22b that is narrower than the wide portion 22a and connects to the base 21a of the protruding piece 21. As shown in Figure 4(a), the wide portion 22a is generally fan-shaped in a plan view, and gradually widens from the narrow portion 22b toward the inner circumferential surface of the recess 11a in an in-plane direction so as to draw an outwardly convex arc 22c. The narrow portion 22b is connected to a part of the push-down portion 21c of the base 21a of the protruding piece 21.

[0025] The width of the wide portion 22a is preferably 1.2 times or more, more preferably 1.5 times or more, and even more preferably 1.7 times or more, of the narrow portion 22b. On the other hand, the width of the wide portion 22a is preferably 5 times or less, more preferably 4 times or less, and even more preferably 3.5 times or less, of the narrow portion 22b.

[0026] Furthermore, it is preferable that an area of ​​at least 1 / 2 and at most 9.5 / 10 of the outer periphery of base portion 21a is surrounded by intended rupture portion 23 in plan view. Air holes 30 having a shape similar to the planar shape of base portion 21a can be formed when most of the outer periphery of base portion 21a is surrounded by intended rupture portion 23. From this perspective, it is more preferable that at least 2 / 3 of the outer periphery of base portion 21a is surrounded by intended rupture portion 23 in plan view, and even more preferable that at least 3 / 4 of the outer periphery is surrounded by intended rupture portion 23.

[0027] 4(b), the thickness D1 of the connecting portion 22 is thinner than the thickness D2 of the bottom wall surface 11 and thicker than the thickness D3 of the portion to be broken 23. As shown in FIGS. 3 and 4(b), the connecting portion 22 is connected to the inner circumferential surface of the recess 11a and is not allowed to protrude outside the bottom wall surface 11. The thickness D1 of the connecting portion 22 is thinner than the depth D4 of the recess 11a.

[0028] As described above, the breakable portion 23 forms the bottom of the recess 11a provided in the bottom wall surface 11, and is formed with a thickness D3 (see Figure 4(b)) that will break when the protruding piece 21 is pushed down with a force greater than a predetermined force.

[0029] Here, the thickness D1 of the connecting portion 22 is preferably at least twice, more preferably at least 2.5 times, and even more preferably at least 3 times the thickness D3 of the portion to be broken 23. Furthermore, the thickness D1 of the connecting portion 22 is preferably at most 0.95 times, more preferably at most 0.9 times, and even more preferably at most 0.85 times the thickness D2 of the bottom wall surface 11. Furthermore, the thickness D1 of the connecting portion 22 is preferably at least 0.5 times, and even more preferably at least 0.6 times the thickness D2 of the bottom wall surface 11. The thickness D1 of the connecting portion 22 is set within the above range to be thicker than the thickness D2 of the portion to be broken 23 and thinner than the thickness D2 of the bottom wall surface 11, so that the connecting portion 22 will not easily break even if the portion to be broken 23 is broken.

[0030] When removing contents from the container 100 configured as described above onto a dish or the like, as shown in FIG. 3(a), the container body 10 is placed face down on the dish (not shown) with the top surface 13 of the container body 10 facing the dish. Then, as shown in FIG. 3(b), by pressing a finger or the like against the flat surface 21d of the protruding piece 21 and pushing it down toward the side where the connecting portion 22 is provided, i.e., in the direction of the central axis O (in the illustrated example, the direction of the arrow between FIGS. 3(b) and 3(c)), the protruding piece 21 moves with the connecting portion 22 as the axis of rotation, such that the tip portion 21b approaches the bottom wall surface 11. Because the breakable portion 23 is integrally molded with the base portion 21a, the protruding piece 21 is flexibly deformed when pushed down. When a force greater than a predetermined value is applied to the protruding piece 21, the breakable portion 23 breaks, and an air hole 30 is opened in the bottom wall surface 11, as shown in FIG. 3(c).

[0031] When the air hole 30 is opened in the bottom wall surface 11, air can be introduced between the inner surface of the container body 10 and the contents, and the contents fall onto a plate or the like due to their own weight. At that time, the contents are taken out onto a plate or the like while substantially maintaining the internal shape of the container body 10.

[0032] In the container 100 configured as described above, by providing the connecting portion 22, when the protruding piece 21 is pushed down, the connecting portion 22 is less likely to bend and deform because it is thicker than the portion to be broken 23, and the load can be concentrated at the position of the portion to be broken 23 facing the connecting portion 22. Therefore, compared to a case in which the connecting portion 22 is not provided, it is possible to initiate the breaking of the portion to be broken 23 with a smaller force, and the portion to be broken 23 can be broken quickly. Furthermore, even if the portion to be broken 23 is broken, the connecting portion 22 is not broken because it is thicker than the portion to be broken 23, and the connected state between the bent protruding piece 21 and the bottom wall surface 11 can be maintained. Furthermore, by connecting portion 22 within recess 11a to a part of base 21a of protruding piece 21 and the inner peripheral surface of recess 11a, connecting to the inner peripheral surface side over a wide area by wide portion 22a and connecting to base 21a over a narrow area by narrow portion 22b, intended rupture portion 23 is secured over a wide area around base 21a, preventing rupture of intended rupture portion 23 when removing from the mold, etc., and suppressing the inadvertent opening of air hole 30. Therefore, compared to conventional equivalent containers, it is possible to provide a container that can be manufactured with a good yield while maintaining or improving the functionality required of perforation functional portion 20.

[0033] Furthermore, in the container 100 of this embodiment, the wide portion 22a of the connecting portion 22 gradually widens from the narrow portion 22b toward the inner peripheral surface of the recess 11a, drawing an arc 22c that protrudes outward in the in-plane direction. Therefore, when the protruding piece 21 is pushed down, the wide portion 22a is less likely to twist, and the load can be more efficiently concentrated at the position of the intended rupture portion 23 on the side facing the connecting portion 22. [Example]

[0034] The container 100 according to the present invention will now be described in more detail. Using the container 100 shown in FIGS. 1 to 5 as an example, a strength analysis was carried out under the following strength analysis conditions.

[0035] (1) Hole function part 20 The thickness of each part of the hole-opening function part 20 in the container 100 (see FIG. 4(b)) is as follows: The container 100 is made of polypropylene, and is obtained by integrally molding the container body 10 and the hole-opening function part 20. Thickness D1 of connecting part 22: 0.5 mm Bottom wall thickness D2: 0.7 mm Thickness D3 of the fractured portion 23: 0.13 mm Depth D4 of recess 11a: 0.57 mm Length of protruding piece 21: 8 mm However, the length L of the protruding piece 21 is the length from the inner surface of the bottom wall surface 11 to the tip of the protruding piece 21.

[0036] (2) Container of Comparative Example As a comparative example container for comparison with the container 100 of the above-mentioned embodiment, a container identical to that of Example 1 was prepared, except that it did not have the connecting portion 22 and had a thin-walled breakable portion with a thickness of 0.13 mm around the base 21a of the protruding piece 21, as in the embodiment.

[0037] (3) Strength analysis conditions For the container 100 of the above-mentioned example and the container of the comparative example, when the protruding piece 21 of each was pushed down, the force applied between the base 21a of the protruding piece 21 and the intended breaking portion 23 was measured until the protruding piece 21 broke. The measurement was carried out in accordance with ISO178 / JIS K7171 Plastics - Bending Properties. Specifically, a measuring machine equipped with a push-pull gauge attached to an elevator was used, and a dedicated jig for pressing the flat portion 21d of the protruding piece 21 was attached to the push-pull gauge. The elevator speed was set to 100 mm / min, and the peak strength of the push-pull scale was measured.

[0038] (4) Evaluation results In the container 100 of the example, the bending strength, i.e., the bending strength until the portion between the base 21a of the protruding piece 21 and the intended breaking portion 23 broke, was approximately 8 N. Furthermore, as a result of the strength analysis, it was confirmed that when the protruding piece 21 was pushed down, the load was concentrated near the position (position indicated by arrow P in the figure) that faces the connecting portion 22 of the intended breaking portion 23 across the protruding piece 21. In other words, it was confirmed that the breaking of the intended breaking portion 23 started from the position P, and the air hole 30 (FIG. 3(c)) was opened.

[0039] In contrast, the container of the comparative example does not have the above-mentioned connecting portion 22, so when the protruding piece 21 is pushed down, the push-down portion 21c side of the intended breaking portion, which is provided to surround the periphery of the base portion 21a, is bent and deformed so as to sink into the storage space of the container body 10, and the flat portion 21d side is bent and deformed in a direction protruding from the bottom wall surface 11. In this way, when the protruding piece 21 is pushed down, the load is distributed and transmitted to the intended breaking portion. Therefore, in the container of the comparative example, the bending strength between the protruding piece and the intended breaking portion until it breaks is about 15 N.

[0040] Furthermore, in the container 100 of the example, the presence of the connecting portion 22 allows the protruding piece 21 to be stably provided in the recess 11a, and the intended breaking portion 23 is unlikely to break inadvertently when the container is removed from the mold, and it was confirmed that the container 100 can be manufactured with a good yield. On the other hand, the container of the comparative example does not have the connecting portion 22, and therefore, careful work is required to prevent the intended breaking portion 23 from breaking when the container is removed from the mold, and manufacturing efficiency was reduced compared to the container 100 of the example.

[0041] The above describes the container 100 according to the embodiment and example of the present invention, but the present invention is not limited to the above embodiment, and it goes without saying that it can be modified as appropriate within the scope of the spirit of the present invention. For example, in the container 100 described above, the recess 11a has an opening on the lower surface of the bottom wall 11 and is recessed toward the storage space. However, instead of the recess 11a, the inner surface of the bottom wall 11 (the surface facing the storage space) may be the opening surface, and the recess may be recessed in the thickness direction. In this case, the bottom surface of the recess should coincide with the lower surface of the bottom wall 11, and the protruding piece 21 should be provided so as to protrude downward from the bottom surface of the recess. However, it is preferable to configure the recess 11a so that the opening surface is provided on the lower surface of the bottom wall 11 and recessed toward the storage space, as in the above embodiment, because this allows the air hole 30 to be opened with less force.

[0042] Furthermore, in the above embodiment, the wide portion 22a gradually widens from the narrow portion 22b toward the inner peripheral surface of the recess 11a, drawing an arc 22c that protrudes outward in the in-plane direction, but it may also simply widen in a straight line.

[0043] Furthermore, in the container 100 described above, the bottom wall surface 11 is flower-shaped, the top surface 13 is circular, and the lower portion 12a and the upper portion 12b of the side wall surface 12 are formed in different shapes, but the shape of the container body 10 is not limited to this. Because the container body 10 also has functions such as a pudding shape or a jelly shape, the shape of the container body 10 can be changed appropriately depending on the shape into which the contents are to be dispensed. For example, the bottom wall surface 11 and the top surface 13 may be similar in shape to a truncated cone or a truncated polygonal pyramid shape such as a truncated square pyramid. However, in order to facilitate smooth dispense of the contents, it is preferable that the opening area of ​​the top surface 13 is larger than the area of ​​the bottom wall surface 11.

[0044] Furthermore, the thickness D1 and thickness D3 of the connecting portion 22 and the intended breaking portion 23 can be set appropriately depending on the type of resin material that constitutes the container 100.

[0045] Furthermore, in the above embodiment, a leg frame wall 14 having a shape approximately the same as the outer edge shape of the bottom wall surface 11 is protruded below the bottom wall surface 11, but the shape of the leg is not particularly limited as long as the leg is provided so that the protruding piece 21 on the underside of the bottom wall surface 11 does not come into contact with the placement surface when stacking the containers 100 or displaying them on a store shelf. [Explanation of symbols]

[0046] 10: Container body 11: Bottom wall 11a: recess 12: Side wall 12a: Lower part 12b: Upper part 13: Top 13a: Flange part 14: Leg frame wall 15: Middle bottom wall surface 20: Hole function part 21:Protruding piece 21a: base 21b:Tip 21c: Push down part 21d: Flat part 22:Connection part 22a: Wide section 22b: Narrow part 22c: arc 23: Expected fracture area 30: Air vent 100: Container D1: Thickness of the connecting part D2: Bottom wall thickness D3: Thickness of the part to be broken D4: Depth of recess L: Projection length of the protruding piece O: Central axis

Claims

1. a container body having a bottom wall surface and a side wall surface that define a storage space for storing contents; a recess provided on the bottom wall surface and recessed in a thickness direction; a hole opening function portion for opening an air hole penetrating through the recess in a thickness direction; Equipped with The opening function portion is a protruding piece having a base disposed within the recess and a tip protruding outward from the bottom wall surface; a connecting portion that connects a part of the base portion and an inner circumferential surface of the recess; a breakable portion that forms a bottom of the recess and is provided around the base except for the part; Equipped with A container wherein the connecting portion is formed thinner than the thickness of the bottom wall surface and thicker than the thickness of the intended rupture portion, and the connecting portion has a wide portion that is wide in the in-plane direction of the bottom wall surface and is connected to the inner surface of the recess, and a narrow portion that is narrower than the wide portion and is connected to the base of the protruding piece.

2. 2. The container according to claim 1, wherein the wide portion of the connecting portion is widened from the narrow portion toward the inner surface of the recess so as to form an arc that is convex outward in the in-plane direction of the bottom wall surface.

3. The container according to claim 1 , wherein the recess has an opening at the lower surface of the bottom wall and is recessed toward the storage space.

4. The container according to claim 1 , wherein the projecting piece has a flat surface portion or a concave curved surface portion recessed toward the connecting portion on the opposite side to the connecting portion.

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