JP2023163394A - container - Google Patents

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 The present invention relates to a container, and more particularly to a container capable of forming air holes in the bottom wall surface of the container body for taking out the contents.

2. Description of the Related Art Containers that can be filled with pudding, jelly, agar, egg tofu, sesame tofu, etc., and which can have air holes in the bottom wall of the container body to take out the contents are known. In this type of container, a portion of the bottom wall is removed along with the base by pushing down a protruding piece protruding from the bottom wall of the container body and breaking the protruding piece from the base, thereby creating air holes in the bottom wall. It is about to be opened.

For example, in the container disclosed in Patent Document 1, an annular thin wall portion is provided around the base of the protruding piece in the bottom wall portion, and the thickness of the annular thin wall portion is set to a value that is smaller than the thickness of the bottom wall portion and is easy to break. An aperture function section is provided whose width is set to a value that allows for slight bending deformation. In this container, it is possible to easily break the container between the bottom wall portion and the base of the protruding piece, compared to a container not provided with the annular thin wall portion. In addition, since the annular thin-walled portion breaks after being bent and deformed, it exerts a cushioning effect, and when opening the air hole, it is difficult for the impact to be transmitted to the fingers, etc., so that an unpleasant feeling of resistance is not caused.

Japanese Patent Application Publication No. 2011-51598

Pudding and the like are often used as snacks for infants and children. Therefore, it is required that the air holes can be easily opened even by a small child. On the other hand, after the air holes are opened, the protruding piece should not be completely separated from the bottom wall surface, but should be partially connected to the bottom wall surface. Furthermore, it is necessary to prevent air holes from being inadvertently opened in the bottom wall surface during the manufacturing and distribution stages. Therefore, in the container disclosed in Patent Document 1, the thickness and width of the annular thin wall portion are designed in units of 0.1 mm, for example, and it is difficult to mass-produce such a container with a high yield. .

Therefore, an object of the present invention is to provide a container that can be manufactured at a high yield while maintaining or improving the functions required of the hole-opening function section.

In order to solve the above problems, a container according to the present invention includes a container main body having a bottom wall surface and a side wall surface that partition a storage space for accommodating contents, a recess provided in the bottom wall surface and recessed in the thickness direction, a hole-opening function section for opening an air hole that penetrates the recess in the thickness direction, and the hole-opening function section has a base disposed within the recess and a distal end located outside the bottom wall surface. a protruding piece that protrudes toward the base, a connecting part that connects a part of the base and an inner circumferential surface of the recess, and a connecting part that forms the bottom of the recess and is provided around the base except for the part. a scheduled rupture portion, the connecting portion is formed to be thinner than the wall thickness of the bottom wall surface and thicker than the wall thickness of the scheduled rupture portion, and the connecting portion is formed to be thinner than the wall thickness of the bottom wall surface, and the connecting portion It is characterized by having a wide part that is wide in the inward direction and connected to the inner circumferential surface of the recess, and a narrow part that is narrower than the wide part and connected to the base of the protruding piece. .

In the container according to the present invention, the wide portion of the connecting portion draws a convex arc outwardly in the in-plane direction of the bottom wall surface, and extends from the narrow portion to the inner circumferential surface of the recess. It is preferable that the width is widened toward the front.

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

In the container according to the present invention, it is preferable that the projecting piece is provided with a planar flat part or a concave curved part recessed toward the connecting part on the side opposite to the connecting part.

According to the container according to the present invention, when configuring the hole-opening function section for opening an air hole in the bottom wall surface of the container, the base of the protruding piece is arranged in the recess provided in the bottom wall surface, and the entire periphery of the base is Rather than providing a thin portion to be broken, a portion thereof is connected to the inner circumferential surface of the recess by a connecting portion that is thicker than the portion to be broken and thinner than the bottom wall surface. Further, the connecting portion includes a wide portion and a narrow portion, the wide portion being connected to the inner circumferential surface of the recess, and the narrow portion being connected to the base of the protruding piece. With this configuration, when the protruding piece is pushed down toward the connecting part, the load is concentrated on the side where the force for pushing it down is applied to the protruding piece (the side facing the connecting part with the protruding piece in between). be able to. Therefore, according to the container, it is possible to initiate the breakage of the planned breakage portion with a smaller force than in the case where the connecting portion is not provided, and the periphery of the protruding piece can be quickly broken. In addition, the connecting part is connected in the recess between a part of the base of the protruding piece and the inner peripheral surface of the recess, and the inner peripheral surface side is connected in a wider area by the wide part, and the narrower part is connected in a narrower area from the base. By connecting with the mold, it is possible to secure a wide area around the base and prevent the planned rupture area from breaking or inadvertently opening an air hole when taking it out from the mold. . Therefore, compared to conventional equivalent containers, it is possible to provide a container that can be manufactured at a high yield while maintaining or improving the functionality required of the perforated function section.

1 is a diagram showing an embodiment of a container according to the present invention, in which (a) is a front view (partially sectional view), and (b) is a bottom view. However, the cross section in (a) corresponds to the A-A' cross section in (b). (a) is a top view of the container shown in FIG. 1, and (b) is a side view (partial sectional view) of the container. However, the cross-sectional portion in (b) corresponds to the B-B' cross-section in FIG. 1(b). (a) is a perspective view showing a state in which the container shown in FIG. FIG. 1(a) is an enlarged view showing the configuration of the hole-opening function portion shown in FIG. 1(b), and FIG. 1(b) is a cross-sectional view taken along the line C-C' in FIG. 1(a). However, the CC' cross section corresponds to the A-A' cross section in FIG. 1(b). (a) is a view of the hole-opening function portion shown in FIG. 4(a) when viewed from C to C', and (b) is a sectional view taken along line DD' in FIG. 4(a).

Embodiments of the container according to the present invention will be described with reference to the drawings.
FIG. 1A shows a front view (partial cross section) of a container 100 of this embodiment, and FIG. 1B shows a bottom view of the container 100. The container 100 has a container body 10 and an opening on the bottom wall surface 11 of the container body 10 for opening an air hole 30 (see FIG. 3(c)) for taking out the contents filled in the container body 10. A hole function section 20 is provided. The container body 10 and the opening function part 20 are integrally molded, and can be used for various containers such as polypropylene (PP) resin, polystyrene (PS) resin, polyethylene terephthalate (PET) resin, etc. It can be molded using resin used for packaging materials.

The configuration of each part will be explained in more detail below. Note that in the following, the vertical 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 the lower side, and the side where the top surface 13 is located is the upper side. Further, the radial direction refers to a direction perpendicular to the central axis O, and the in-plane direction refers to a horizontal direction assuming that the target surface (for example, the bottom wall surface 11) is a horizontal surface.

First, the container body 10 will be explained with reference to FIGS. 1 to 3. As shown in FIG. 1(a), the container body 10 has the bottom wall surface 11 and side wall surfaces 12, which define a storage space in which the contents are stored. The top surface 13 of the container body 10 is open, and contents can be filled or taken out from the top surface 13. As the contents, 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 solidified by heating etc., are preferably used. can be accommodated.

In the container 100 of this embodiment, the bottom wall surface 11 has a flower shape as shown in FIGS. 1 to 3, and the lower part 12a of the side wall surface 12 has a flower shape in a plan view (when viewed from a direction perpendicular to the axial direction). , the diameter increases upward in the axial direction. The upper portion 12b of the side wall surface 12 has a circular shape in plan view, and its diameter increases upward in the axial direction. 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 the middle bottom wall surface 15 (see FIGS. 1(b) and 2(a)).

The top surface 13 is provided with a flange portion 13a that projects radially outward from the upper end of the upper portion 12b of the side wall surface 12. The container body 10 can be hermetically sealed by covering the top surface 13 with a sealing material (not shown) such as an aluminum vapor-deposited film or a resin film, and thermocompressing the sealing material onto the flange portion 13a.

As shown in FIGS. 1(a) and 2(b), a leg frame wall 14 is provided on the lower surface of the bottom wall surface 11. The leg frame wall 14 has a flower-shaped frame shape that is slightly smaller than the bottom wall surface 11 in plan view, as shown in FIG. The protrusion length of the leg frame wall 14 from the bottom wall surface 11 is configured to be longer than the protrusion length L of the protrusion piece 21 from the bottom wall surface 11 (see FIG. 4(b)). Furthermore, when the container bodies 10 are stacked, the leg frame wall 14 of the container body 10 located above comes into contact with the upper surface of the bottom wall surface 11 of the other container body 10 located below, and the protrusion of the opening function part 20 The tip of the piece 21 is spaced apart from the bottom wall surface 11 of the other container body 10, so that no force is applied to the protruding piece 21 during stacking.

Next, the hole-opening function section 20 will be explained mainly with reference to FIGS. 3 to 5. FIG. 3(a) shows a state in which the container main body 10 is turned upside down from the upright position shown in FIG. 1(a) so that the top surface 13 is disposed downward in the axial direction. As shown in FIG. 3, the outer surface (lower surface) of the bottom wall surface 11 is provided with a recessed portion 11a that is recessed in the thickness direction, that is, toward the accommodation space. The hole-opening function section 20 is provided within this recess 11a. In other words, the recessed portion 11a becomes an air hole opening area where the air hole 30 (FIG. 3(c)) is opened by the hole opening function section 20.

As shown in FIGS. 3 to 5, the hole opening function section 20 includes a protrusion piece 21 having a base portion 21a disposed within the recess 11a and a tip portion 21b protruding in the axial direction toward the outside of the bottom wall surface 11; Except for the connecting part 22 that connects a part of the base 21a and the inner circumferential surface of the recess 11a, and the part that forms the bottom of the recess 11a and connects the base 21a and the connecting part 22, the parts of the base 21a are It is provided with a planned rupture portion 23 provided around the periphery.

As shown in FIG. 4(a), the hole-opening function section 20 has a line-symmetrical shape in plan view. The axis of symmetry is shown as a straight line C-C' in FIG. 4(a). The straight line C-C' corresponds to the straight line A-A' shown in FIG. 1(b).

It protrudes along the straight line CC' from the "C" side (the side far from the central axis O) toward the "C'" side (the side close to the central axis O) where the connecting portion 22 is provided. When the piece 21 is pushed down, an air hole 30 (FIG. 3(c)) is opened in the bottom wall surface 11. Hereinafter, the side of the protruding piece 21 that is close to the bottom wall surface 11 when the protruding piece 21 is pushed down, that is, the side that is close to the central axis O of the protruding piece 21, will be referred to as the "push-down portion 21c."

As shown in FIGS. 3 to 5, the entire protruding piece 21 is formed into a tapered round bar shape, but on the opposite side of the push-down part 21c, that is, on the side far from the central axis O of the protruding piece 21, there is a tip from the base 21a. A planar flat portion 21d is provided toward the portion 21b. By providing the flat portion 21d, when pushing down the protrusion piece 21 with a finger or the like, a large contact area between the finger or the like and the protrusion piece 21 can be ensured, and it is possible to suppress pain in the finger or the like. However, instead of the flat portion 21d, the portion may be a concave curved portion that is concave toward the push-down portion 21c along the convex shape of the finger.

As shown in FIGS. 3(b) and 4(a), the connecting portion 22 includes a wide portion 22a that is connected to the inner peripheral surface of the recess 11a, and a base portion of the protruding piece 21 that is narrower than the wide portion 22a. 21a, and a narrow portion 22b connected to 21a. As shown in FIG. 4(a), the wide part 22a has a substantially fan shape in plan view, and draws an arc 22c that is convex outward in the in-plane direction from the narrow part 22b toward the inner peripheral surface of the recessed part 11a. has been gradually expanded. The narrow portion 22b is connected to a portion of the push-down portion 21c of the base portion 21a of the protruding piece 21.

The wide part 22a is preferably 1.2 times or more wider than the narrow part 22b, more preferably 1.5 times or more, and still more preferably 1.7 times or more wider. preferable. 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 than the narrow portion 22b.

Further, it is preferable that a range of 1/2 or more and 9.5/10 or less of the outer circumference of the base 21a is surrounded by the planned rupture portion 23 in plan view. When most of the outer periphery of the base 21a is surrounded by the scheduled breakage portion 23, the air hole 30 can be formed in a shape closer to the planar shape of the base 21a. From this point of view, it is more preferable that 2/3 or more of the outer periphery of the base 21a is surrounded by the planned rupture part 23 in plan view, and it is even more preferable that 3/4 or more of the outer periphery of the base 21a is surrounded by the planned rupture part 23.

Further, as shown in FIG. 4(b), a wall thickness D1 of the connecting portion 22 is formed to be thinner than a wall thickness D2 of the bottom wall surface 11 and thicker than a wall thickness D3 of the scheduled breakage portion 23. The connecting portion 22 is connected to the inner circumferential surface of the recess 11a, as shown in FIGS. 3 and 4(b), and is configured not to protrude to the outside of the bottom wall surface 11. Further, the thickness D1 of the connecting portion 22 is formed to be thinner than the depth D4 of the recessed portion 11a.

As described above, the planned rupture portion 23 forms the bottom of the recess 11a provided in the bottom wall surface 11, and has a wall thickness D3 (FIG. 4(b)) such that it will break if the protruding piece 21 is pushed down with a predetermined force or more. (see).

Here, the thickness D1 of the connecting portion 22 is preferably twice or more, more preferably 2.5 times or more, and more preferably three times or more as compared to the thickness D3 of the planned breakage portion 23. is even more preferable. Further, the wall thickness D1 of the connecting portion 22 is preferably 0.95 times or less, more preferably 0.9 times or less, and 0.85 times or less than the wall thickness D2 of the bottom wall surface 11. More preferred. Further, the thickness D1 of the connecting portion 22 is preferably 0.5 times or more, and more preferably 0.6 times or more, the thickness D2 of the bottom wall surface 11. The thickness D1 of the connecting portion 22 is set to be thicker than the wall thickness D2 of the portion to be broken 23 and thinner than the wall thickness D2 of the bottom wall surface 11, so that even if the portion to be broken 23 is broken, the connecting portion 22 cannot be easily broken. It is assumed that the thickness is set within the above range.

When taking out the contents from the container 100 configured as described above onto a plate or the like, as shown in FIG. Lay it face down on a plate, etc. Then, as shown in FIG. 3(b), press a finger or the like against the flat part 21d of the protruding piece 21, and press the side where the connecting part 22 is provided, that is, in the direction of the central axis O (in the illustrated example, When the protruding piece 21 is pushed down in the direction of the arrow shown between FIG. Since the planned rupture portion 23 is integrally molded with the base portion 21a, it is bent and deformed when the protruding piece 21 is pushed down. Then, when a predetermined force or more is applied to the protruding piece 21, the scheduled breakage portion 23 breaks, and an air hole 30 is opened in the bottom wall surface 11 as shown in FIG. 3(c).

When the air holes 30 are 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 will fall onto a plate or the like due to its 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.

According to 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 thicker than the expected breakage portion 23, so it is difficult to bend and deform, and it is difficult to break. It is possible to concentrate the load on the position of the scheduled portion 23 facing the connecting portion 22 . Therefore, compared to the case where the connecting portion 22 is not provided, the planned rupture portion 23 can be started to break with a small force, and the planned rupture portion 23 can be broken quickly. Further, even if the scheduled breakage portion 23 is broken, the connecting portion 22 is thicker than the planned breakage portion 23 and will not be broken, and the connected state between the bent protruding piece 21 and the bottom wall surface 11 can be maintained. . In addition, the connecting portion 22 is connected within the recess 11a between a part of the base 21a of the protruding piece 21 and the inner circumferential surface of the recess 11a, and the inner circumferential surface side is connected over a wider area by the wide portion 22a, and the narrow portion By connecting the base portion 21a with the base portion 22b in a narrow area, the portion to be broken 23 can be secured in a wide area around the base portion 21a, and the portion to be broken 23 can be prevented from breaking when taken out from the mold. This can prevent the air holes 30 from being opened inadvertently. Therefore, compared to conventional equivalent containers, it is possible to provide a container that can be manufactured with high yield while maintaining or improving the functionality required of the hole-opening function section 20.

Further, in the container 100 of the present embodiment, the wide portion 22a of the connecting portion 22 gradually extends from the narrow portion 22b toward the inner peripheral surface of the recess 11a so as to draw an arc 22c convex outward in the in-plane direction. It has been expanded to. Therefore, when the protrusion piece 21 is pushed down, the wide portion 22a is less likely to be twisted, and the load can be more efficiently concentrated on the side of the expected rupture portion 23 facing the connecting portion 22.

Hereinafter, the container 100 according to the present invention will be explained in more detail.
Using the container 100 shown in FIGS. 1 to 5 as an example, strength analysis was performed under the following strength analysis conditions.

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

(2) Container of Comparative Example As a container of a comparative example for comparison with the container 100 of the above-mentioned example, the connecting portion 22 is not provided, and the wall thickness of the projecting piece 21 is 0.5 mm around the base 21a as in the example. The same container as in Example 1 was prepared except that a 13 mm thin-walled portion to be broken was provided.

(3) Strength analysis conditions Regarding the container 100 of the above-mentioned example and the container of the comparative example, when the respective protruding pieces 21 are pushed down, the distance between the base 21a of the protruding piece 21 and the planned rupture part 23 breaks. The applied force was measured. The measurements were conducted in accordance with ISO178/JIS K7171 Plastic Bending Properties. Specifically, a measuring device with a push-pull gauge set in an elevator was used, and a special jig for pressing the flat part 21d of the protruding piece 21 was set in the push-pull gauge. The speed of the elevator was set to 100 mm/min, and the peak intensity of the push-pull scale was measured.

(4) Evaluation Results In the container 100 of the example, the bending strength, that is, the bending strength until the portion between the base 21a of the protrusion piece 21 and the planned breakage portion 23 was broken, showed a value of about 8N. In addition, as a result of strength analysis, when pushing down the protruding piece 21, the load is concentrated near the position (position indicated by arrow P in the figure) that faces the connecting part 22 of the planned breakage part 23 with the protruding piece 21 in between. was confirmed. In other words, it was confirmed that the planned rupture portion 23 started to fracture starting from the position P, and the air hole 30 (FIG. 3(c)) was opened.

On the other hand, in the container of the comparative example, since the connecting part 22 is not present, when the protruding piece 21 is pushed down, the pushing part 21c side of the part to be broken, which is provided so as to surround the base part 21a, is connected to the container body 10. The flat portion 21d side is bent and deformed in a direction protruding from the bottom wall surface 11. In this manner, when the protrusion piece 21 is pushed down, the load is distributed and transmitted to the portion scheduled to break. Therefore, in the container of the comparative example, the bending strength between the protruding piece and the planned rupture portion was approximately 15N.

In addition, in the container 100 of the embodiment, the presence of the connecting portion 22 allows the protrusion piece 21 to be stably provided in the recess 11a, and the planned breakage portion 23 is unlikely to be accidentally broken when taken out from the mold. It was confirmed that the container 100 could be manufactured with good yield. On the other hand, the container of the comparative example does not have the connecting part 22, so it is necessary to work carefully so that the planned rupture part 23 does not break when taking it out from the mold, and the manufacturing efficiency is lower than that of the container 100 of the example. decreased.

Although the embodiments and examples of the container 100 of the present invention have been described above, the present invention is not limited to the above embodiments, and it goes without saying that changes can be made as appropriate without departing from the spirit of the present invention. be.
For example, in the container 100, the recess 11a has the lower surface of the bottom wall surface 11 as an opening surface and is recessed toward the storage space side. It may also be a recess that is recessed in the thickness direction. In this case, the bottom surface of the recess may match the lower surface of the bottom wall surface 11, and the protruding piece 21 may be provided so as to protrude below the bottom wall surface 11 from the bottom surface of the recess. However, if the opening surface of the recess 11a is provided on the lower surface side of the bottom wall surface 11 and recessed toward the accommodation space side as in the above embodiment, the air hole 30 can be opened with a smaller force. preferable.

Further, in the above embodiment, the wide portion 22a gradually widens from the narrow portion 22b toward the inner peripheral surface of the recess 11a so as to draw an arc 22c convex outward in the in-plane direction. It is also possible to simply widen the width in a straight line.

Further, in the container 100, the bottom wall surface 11 is flower-shaped, the top surface 13 is circular, and the lower part 12a and upper part 12b of the side wall surface 12 are formed in different shapes. is not limited to this. Since the container body 10 also has pudding-shaped and jelly-shaped functions, the shape of the container body 10 can be changed as appropriate depending on the shape from which the contents are to be taken out. For example, the bottom wall surface 11 and the top surface 13 may have a similar truncated cone shape or a polygonal truncated pyramid shape such as a truncated pyramid shape, or the shape of the bottom wall surface 11 and the top surface 13 may be such that the contents are For good removal, it is preferable that the opening area of the top surface 13 is wider than the area of the bottom wall surface 11.

Further, the wall thickness D1 and the wall thickness D3 of the connecting portion 22 and the expected breakage portion 23 can be set as appropriate depending on the type of resin material that constitutes the container 100.

Furthermore, in the embodiment described above, the leg frame wall 14 having a shape substantially the same as the outer edge shape of the bottom wall surface 11 is provided below the bottom wall surface 11, but when stacking the containers 100 or on a product shelf. The shape of the legs is not particularly limited, as long as the legs are provided so that the protruding piece 21 provided on the lower surface of the bottom wall surface 11 does not come into contact with the mounting surface during display etc. .

10 : Container body 11 : Bottom wall surface 11a : Recessed part 12 : Side wall surface 12a : Lower part 12b : Upper part 13 : Top surface 13a : Flange part 14 : Leg frame wall 15 : Middle bottom wall surface 20 : Hole function part 21 : Projecting piece 21a : Base part 21b : Tip part 21c : Push-down part 21d : Flat part 22 : Connecting part 22a : Wide part 22b : Narrow part 22c : Arc 23 : Scheduled breakage part 30 : Air hole 100 : Container D1 : Thickness of the connecting part D2 : Thickness of the bottom wall surface D3 : Thickness of the planned rupture part D4 : Depth of the recess L : Projection length of the protruding piece O : Central axis

Claims (4)

a container body having a bottom wall surface and a side wall surface defining a storage space for accommodating contents;
a recess provided in the bottom wall surface and recessed in the thickness direction;
a hole-opening function section for opening an air hole that penetrates the recess in the thickness direction;
Equipped with
The hole-opening function part is
a protrusion piece having a base disposed within the recess and a tip protruding toward the outside of the bottom wall surface;
a connecting portion that connects a portion of the base and an inner circumferential surface of the recess;
a scheduled rupture portion that forms the bottom of the recess and is provided around the base except for the part;
Equipped with
The connecting portion is formed to be thinner than the wall thickness of the bottom wall surface and thicker than the wall thickness of the scheduled rupture portion, and the connecting portion is wide in the in-plane direction of the bottom wall surface, and the connecting portion is wide in the in-plane direction of the bottom wall surface. A container comprising: a wide part connected to an inner peripheral surface; and a narrow part narrower than the wide part and connected to the base of the protruding piece. The wide portion of the connecting portion is widened from the narrow portion toward the inner circumferential surface of the recess so as to draw an outwardly convex arc in the in-plane direction of the bottom wall surface. A container according to claim 1. 2. The container according to claim 1, wherein the recess has an opening surface at a lower surface of the bottom wall surface and is recessed toward the accommodation space. 2. The container according to claim 1, wherein the projecting piece is provided with a planar flat part or a concave curved part recessed toward the connecting part on the opposite side of the connecting part.

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