container

Abstract

The present invention provides a container capable of suppressing cracking at the lower end of a protrusion. The present invention provides a container comprising a housing portion and a protrusion. The housing portion has a bottom surface comprising a central portion and a peripheral portion surrounding the central portion. The central portion is recessed relative to the peripheral portion, with the bottom portion suspended. The protrusion protrudes downward from the central portion, and the protrusion includes an upwardly curved portion in a region at the center of the longitudinal direction including the lower end of the protrusion.

Description

[0001] This application is a divisional application of the original application with application number "201980027279.3" and invention name "Container", which entered the Chinese national phase of the PCT international application with an international filing date of May 22, 2019.

Technical field

[0002] The present invention relates to a container.

[0003] [Prior Art]

[0004] (First Viewpoint)

[0005] Conventionally, there is known a container manufactured by direct blow molding using a cylindrical parison. For example, Patent Document 1 discloses a peelable container having an outer shell and an inner bag, wherein the inner bag shrinks as the content decreases.

[0006] (Second Viewpoint)

[0007] For example, Patent Document 2 proposes various structures of a peelable container having a cylindrical body with a bottom, a cylindrical shoulder connected to the body, and a cylindrical mouth connected to the shoulder. The peelable container body is manufactured by forming a parison into a cylindrical shape using a mold. The peelable container body includes an outer shell and an inner bag disposed inside the outer shell. The inner bag contains the contents, and when a user compresses the peelable container to discharge the contents of the inner bag, air enters the outer shell and the inner bag, causing the inner bag to peel from the inner surface of the outer shell.

[0008] (Third Viewpoint)

[0009] Patent Document 3 discloses a check valve having a through hole in a cylindrical body opened and closed by a cover. The cover is connected to the body via a hinge, and the through hole is opened and closed by rotating the cover at the hinge.

[0010]

Prior Technology Document

[0011] Patent Documents

[0012] Patent Document 1: Japanese Patent No. 3401519

[0013] Patent Document 2: Japanese Patent Application Publication No. 2016-117507

[0014] Patent Document 3: Japanese Patent Application Laid-Open No. 2012-106800 [Summary of the invention]

[0015] [Problems to be solved by the invention]

[0016] (First Viewpoint)

[0017] The bottom of this container is a protrusion formed when the laminated blank is fused together. However, when subjected to impact such as falling, stress is concentrated in the central part in the long side direction near the lower end of this protrusion, so there is a risk of cracking.

[0018] The present invention has been made in view of the above circumstances, and provides a peelable laminate container capable of suppressing cracking at the lower end of a protruding portion, particularly at the center portion in the longitudinal direction.

[0019] (Second Viewpoint)

[0020] Because the mouth protrudes from the shoulder and its diameter is smaller than the shoulder, the portion where the mouth meets the shoulder may deform. For example, when external force is applied to the mouth, the mouth may bend and retract toward the shoulder. Examples of situations where external force is applied to the mouth include when an object is placed on a peelable container while it is being transported, or when the peelable container is dropped and the mouth impacts the ground.

[0021] The present invention has been made in view of the above-mentioned circumstances, and provides a peelable laminated container capable of preventing the mouth from bending and retreating toward the shoulder.

[0022] (Third Viewpoint)

[0023] The present inventors have discovered that when the check valve of Patent Document 3 is used on a laminated peelable container, the check valve may not function properly, causing external air to enter the inner bag after the contents are discharged.

[0024] The present invention has been made in view of the above-mentioned circumstances, and provides a peelable laminated container capable of suppressing entry of outside air into an inner bag.

[0025]

Methods to solve the problem

[0026] (First Viewpoint)

[0027] According to the present invention, a container is provided, comprising a receiving portion and a protruding portion. The receiving portion has a bottom surface comprising a central portion and a peripheral portion surrounding the central portion, the central portion being recessed relative to the peripheral portion with its bottom portion suspended, the protruding portion being configured to protrude downward from the central portion, and the protruding portion having an upwardly curved portion in a region at the center of the longitudinal direction including the lower end of the protruding portion.

[0028] The present inventors have conducted extensive research and found that by bending the longitudinal center region including the lower end of the protrusion upward, stress concentration on the longitudinal center region can be alleviated when subjected to impact such as falling, thereby suppressing cracking.

[0029] Various embodiments of the present invention are described below. The embodiments described below can be combined with each other.

[0030] It is preferable that a lower end of the protruding portion is located above a ground contact surface of the peripheral portion.

[0031] Preferably, a ratio of a distance from the top portion to the most concave portion of the curved portion to a distance from a top portion of the most suspended bottom portion of the central portion to the ground contact surface is 0.75 to 0.99.

[0032] Preferably, the container is constructed to include an outer shell and an inner bag, and the inner bag shrinks as the content decreases.

[0033] Preferably, in the protruding portion, the outer layer constituting the outer shell and the inner layer constituting the inner bag are arranged at positions symmetrical with respect to a plane defined by the longitudinal direction and the vertical direction of the protruding portion.

[0034] The protrusion preferably includes a tapered portion having a shape tapering from the bottom surface toward the bottom end in a cross section perpendicular to the longitudinal direction.

[0035] It is preferable to include a thin-walled portion formed at a lower end side of the tapered portion and having a thickness thinner than that of the tapered portion.

[0036] The container is preferably configured such that the inner bottom surface of the container is curved and convex toward the inside of the container, and the curvature radius of the inner bottom surface in the central area of ​​the container is smaller than the curvature radius of the surrounding area around the central area.

[0037] A container comprising a receiving portion and a protruding portion, wherein the bottom surface of the receiving portion preferably comprises a central portion and a peripheral portion surrounding the central portion, the central portion being recessed relative to the peripheral portion with the bottom portion suspended, the protruding portion being protruding downward from the central portion, the inner bottom surface of the container being the inner bottom surface being a curved shape convex toward the inside of the container, and the curvature radius of the inner bottom surface in the central area of ​​the container being smaller than the curvature radius of the peripheral area around the central area.

[0038] (Second Viewpoint)

[0039] According to the present invention, a stacking peelable container is provided, which is a stacking peelable container having a container body with an outer shell and an inner bag, wherein the container body has a trunk, a shoulder, and a mouth, the trunk is formed into a bottomed cylindrical shape, and the trunk is connected to the shoulder, the shoulder has a flat surface and a reinforced recess, and the flat surface is connected to the mouth, the reinforced recess is recessed from the outer shell side toward the inner bag side, and the reinforced recess extends from the flat surface side to a position hidden in the mouth when the container body is viewed from above.

[0040] According to the stacked peeling container involved in the present invention, the reinforcing recess extends from the flat surface side to a position hidden in the mouth when the container body is viewed from above. As a result, the reinforcing recess is closer to the part where the mouth and the shoulder are connected, thereby preventing the mouth from bending and retreating to the shoulder side.

[0041] Various embodiments of the present invention are described below. The embodiments described below can be combined with each other.

[0042] A peelable laminate container is provided, wherein the mouth portion preferably has a root portion, the root portion is formed to bulge on the flat surface portion, and the reinforcing recessed portion reaches the root portion from the flat surface portion side.

[0043] A peelable laminated container is provided, wherein the shoulder portion preferably projects from the inner space side of the container body toward the outer space side of the container body.

[0044] A laminated peelable container is provided, wherein a first reinforcing recess and a second reinforcing recess corresponding to the reinforcing recess are preferably formed on the shoulder, and the first reinforcing recess and the second reinforcing recess are arranged to form 180 degrees with respect to the central axis of the shoulder.

[0045] A laminated peelable container is provided, wherein the reinforcing recess preferably comprises a bottom wall, a first side wall, and a second side wall, wherein the first side wall and the second side wall are respectively provided at one end and the other end of the bottom wall, and the bottom wall, the first side wall, and the second side wall reach the root.

[0046] A peelable laminate container is provided, wherein the inclination angle of the bottom wall portion is preferably constant from the flat surface portion to the root portion.

[0047] A peelable laminated container is provided, wherein the shoulder portion preferably further includes a curved portion, the curved portion is formed in a cylindrical shape, and the curved portion is connected to the flat portion and the body portion.

[0048] (Third Viewpoint)

[0049] According to the present invention, there is provided a laminated peelable container, which is a laminated peelable container comprising a lid, a container body, and a valve member, wherein the container body comprises an outer shell and an inner bag, and is configured so that the inner bag shrinks as the content decreases, the container body comprises a mouth portion for discharging the content, and an external air introduction hole connecting the intermediate space between the outer shell and the inner bag and the external space, the lid is mounted on the mouth portion and comprises a check valve, the check valve comprising a cylindrical main body portion having a through hole, and a lid portion configured to open and close the through hole, the lid portion having a through hole and a through hole. The edge of the hole abuts to close the inclined surface of the through hole, the main body and the cover are connected by a hinge, and the cover is configured to rotate around the hinge to open the through hole, the valve component includes a cylinder and a moving body, the cylinder has a hollow portion, the hollow portion is configured to connect the intermediate space with the external space, the moving body is accommodated so as to be movable in the hollow portion, the cylinder has a stop portion, and when the moving body moves toward the external space, the stop portion engages with the moving body and blocks the air circulation through the hollow portion.

[0050] The present inventors have conducted extensive research on how to suppress the inflow of external air into the inner bag and have discovered that a method of suppressing the inflow of external air into the inner bag can be achieved by relatively easily mounting a valve member having a specific structure on the main body.

[0051] Various embodiments of the present invention are described below. The embodiments described below can be combined with each other.

[0052] In the peelable laminate container, it is preferred that an angle between the inner surface of the main body and the inclined surface is 25.1 degrees or more.

[0053] In the peelable laminate container, it is preferred that the movable body is spherical.

[0054] In the peelable laminated container, it is preferred that the weight of the movable body is 0.0250 g or less.

[0055] In the peelable laminated container, it is preferred that the weight of the movable body is 0.0150 g or less.

[0056] In a laminated peeling container, the diameter of the movable body is preferably 2.356 mm to 2.406 mm.

Brief Description of the Drawings

[0057] Figure 1 It is a perspective view of the separable container 1 according to the first embodiment of the first aspect of the present invention.

[0058] Figure 2 is included Figure 1 4 is a cross-sectional view of the region of the valve member 4 of the peelable laminated container 1.

[0059] Figure 3 is included Figure 1 A perspective view of the bottom 30 area of ​​the peelable laminated container 1 is shown.

[0060] Figure 4 yes Figure 1 A bottom view of the laminated peeling container 1.

[0061] Figure 5A yes Figure 4 AA section view in Figure 5B yes Figure 4 BB cross-section diagram in Figure 5C yes Figure 5B An enlarged view of the main structure of the cross-section diagram.

[0062] Figure 6 yes Figure 5A A partially enlarged cross-sectional view of region E.

[0063] Figure 7A This is a diagram for explaining the shape of the lower end of the conventional protrusion. Figure 7B This is a diagram illustrating the shape of the lower end of the protruding portion 40 of the separable laminated container 1 according to the present invention.

[0064] Figure 8A is a diagram showing the shape of a protrusion according to a modified example of the present invention, Figure 8B It is a diagram showing the shape of a protrusion according to another modified example of the present invention.

[0065] Figure 9 It is a perspective view of a region including the bottom 30 of the separable container 1 according to the second embodiment of the first aspect of the present invention.

[0066] Figure 10 yes Figure 9 Bottom view of .

[0067] Figure 11 yes Figure 10 AA section view in.

[0068] Figure 12A yes Figure 10 BB cross-section diagram in Figure 12B yes Figure 12A Enlarged view of area B in .

[0069] Figure 13A to Figure 13C These are respectively a front view, a perspective view showing the front side, and a view showing the top side of the separable container 1 according to the embodiment of the second aspect.

[0070] Figure 14 yes Figure 13B An enlarged view of the laminated peeling container 1 is shown.

[0071] Figure 15A-15B They are Figure 13A A back view of the peelable laminated container 1 and a perspective view showing the back view.

[0072] Figure 16 yes Figure 15B An enlarged view of the laminated peeling container 1 is shown.

[0073] Figure 17A yes Figure 13C The AA cross-section shown, Figure 17B yes Figure 17A The enlarged view of the mouth portion 9 and its surroundings shows a state where the pressure cap Cp is installed on the mouth portion 9.

[0074] Figure 18 yes Figure 13C BB cross-section shown.

[0075] Figure 19A yes Figure 17A The CC cross-section shown, Figure 19B yes Figure 19A An enlarged view of the quadrangular area B is shown.

[0076] Figure 20A yes Figure 17A The AA end view shown, Figure 20B yes Figure 17A BB end view shown.

[0077] Figure 21 It is a front view of the separable container 1 according to one embodiment of the third aspect of the present invention.

[0078] Figure 22 Is displayed including Figure 21 1 is a cross-sectional view of the main parts of the lid 2 and the valve member 4 of the laminated peeling container 1.

[0079] Figure 23 yes Figure 22 An enlarged view of cover 2.

[0080] Figure 24 express Figure 23 The check valve 26, Figure 24 A is a stereogram, Figure 24 B is displayed with Figure 23 A stereogram of the same cross section.

[0081] Figure 25 Is with Figure 23 A cross-sectional view of the check valve 26 at the same cross section, Figure 25 A is closed, Figure 25 B is in the open state.

[0082] Figure 26AIt's viewed from above Figure 22 A perspective view of the valve component 4, Figure 26B This is a perspective view of the valve member 4 as seen from below.

[0083] Figure 27A yes Figure 22 A top view of the valve component 4, Figure 27B It is a bottom view of the valve member 4.

[0084] Figure 28A yes Figure 27A AA section view in Figure 28B yes Figure 27A BB cross-section diagram in.

[0085] Figure 29A to Figure 29C Is used to indicate Figure 28A and Figure 28B The end view is formed by taking cross sections along lines CC, DD, and EE.

[0086] Figure 30A 1 is a cross-sectional view showing a state where the valve member 4 is mounted on the housing 12. Figure 30B This is a cross-sectional view showing a state in which the movable body 6 abuts against the stopper 52 s and the cavity 50 is closed.

[0087] Figure 31 It is a perspective view showing the structure of the valve member of Comparative Example 1. [Specific implementation method]

[0088] The following describes the embodiments of the present invention. The various technical features shown in the embodiments illustrated below can be combined with each other. Each technical feature can independently complete the present invention.

[0089] (Implementation of the First Aspect)

[0090] 1. First embodiment of the first aspect

[0091] 1-1. Overall structure

[0092] like Figure 1 As shown, a delamination container 1 according to a first embodiment of the first aspect of the present invention includes a bottomed, substantially cylindrical container body 3 and a valve member 4. The container body 3 includes a receiving portion 17 for receiving contents and a mouth portion 9 for discharging the contents from the receiving portion 17.

[0093] like Figure 2 As shown, the container body 3 includes an outer layer 11 and an inner layer 13 at the receiving portion 17 and the mouth 9, wherein the outer layer 11 constitutes the outer shell 12, and the inner layer 13 constitutes the inner bag 14. As the content decreases, the inner layer 13 peels off from the outer layer 11, and the inner bag 14 peels off from the outer shell 12 and shrinks.

[0094] The mouth 9 is provided with an engaging portion 9e that can engage with a cap (not shown) with a check valve. The cap may be a press-on type or a screw-on type.

[0095] like Figure 2 As shown, valve member 4 is inserted into external air intake hole 15 formed in housing portion 17. Valve member 4 regulates the flow of air between the intermediate space between outer shell 12 and inner bag 14 and the external space. In this embodiment, valve member 4 is configured to close external air intake hole 15 when outer shell 12 is compressed, thereby compressing inner bag 14. When the compressive force on outer shell 12 is released, external air is introduced into the intermediate space.

[0096] The housing portion 17 is covered with a shrink film after the valve member 4 is mounted. At this time, the valve member 4 is mounted on the valve member mounting recess 3r provided in the housing portion 17 so that the valve member 4 does not interfere with the shrink film.

[0097] 1-2. Structure of bottom portion 30

[0098] Next, use Figures 3 to 6 The area near the bottom 30 of the housing portion 17 according to this embodiment will be described. Figure 5A and Figure 5B The outer layer 11 and the inner layer 13 are not distinguished in the cross-sectional view.

[0099] like Figure 3 and Figure 4 As shown, the bottom 30 of the container 17 includes a central portion 31 and a peripheral portion 32. The peripheral portion 32 is provided around the central portion 31. The central portion 31 is recessed further into the container interior than the peripheral portion 32 and forms a convex bottom. Furthermore, a protrusion 40 is formed on the central portion 31, protruding downward from the bottom surface.

[0100] like Figure 5A The enlarged cross-sectional view of the middle region E (i.e. Figure 6 ), the protrusion 40 includes a tapered portion 41 and a thin-walled portion 42. The tapered portion 41 is as shown in FIG. Figure 6 As shown, the cross-sectional shape perpendicular to the long side is tapered from the bottom to the front end. The thin-walled portion 42 is formed at the lower end side of the tapered portion 41 and is thinner than the tapered portion 41. The cross-sectional shape of the thin-walled portion 42 is a rectangle with the long side perpendicular to the bottom (refer to Figure 6 ).like Figure 3 and Figure 5B As shown, the protrusion 40 is formed along its long side direction ( Figure 5B Therefore, a portion of the peripheral portion 32 is a groove portion 33 (refer to Figure 3 ), and the central portion 31 of the portion is connected to the groove portion 33.

[0101] It should be noted that the protrusion 40 protrudes from the central portion 31 and the groove portion 33, which protrude upward from the bottom of the peripheral portion 32, and therefore does not protrude further from the ground contact surface H defined by the peripheral portion 32 (see FIG. Figure 5A ), the thin-walled portion 42 is located above the ground contact surface H.

[0102] like Figure 5B and Figure 7B As shown in the enlarged explanatory diagram (end view) of FIG, the protrusion 40 according to this embodiment includes a curved portion 43 that curves slightly upward (toward the container interior) in the longitudinal center region including the lower end (the lower end of the thin-walled portion 42). In other words, the longitudinal center portion of the lower end of the protrusion 40 is recessed upward. This will be described later.

[0103] 1-3. Forming

[0104] The separable laminated container 1 according to this embodiment is formed by blow molding using a laminated parison. In this process, the laminated parison is pinched off at the lower end of the protrusion 40 (the lower end of the thin-walled portion 42). In other words, the portion of the laminated parison pinched off by the mold defines the shape of the lower end of the protrusion 40.

[0105] When the mold is closed during blow molding, the outer shell 12 and the inner bag 14 are sealed at the protrusion 40. At this time, the tapered portion 41 is tapered and the thin-walled portion 42 is thin. Therefore, the ratio of the inner layer 13 to the outer layer 11 at the protrusion 40 is smaller than that at other parts of the bottom 30, the side of the container body 3, and other locations. Figure 6 As shown, the outer layers 11 are welded to each other in at least a portion of the lower end of the protrusion 40. That is, the outer layers 11 on either side of the seal are directly welded together without passing through the inner layer 13. This structure improves the welding strength of the pinched-off portion compared to a structure in which the entire outer layer 11 is welded together through the inner layer 13 at the protrusion 40, thereby improving impact resistance.

[0106] It should be noted that the protrusion 40 involved in this embodiment has a structure in which the lower end portion is not bent. Figure 6 As shown, at the protrusion 40, the outer layer 11 constituting the outer shell 12 and the inner layer 13 constituting the inner bag 14 are arranged relative to each other. Figure 4 The plane defined by the BB line in (ie, the plane defined by the long side direction and the up-down direction of the protrusion) is symmetrical.

[0107] 1-4. Shape of the Lower End of the Protrusion 40

[0108] In the container with the protrusion at the bottom formed by blow molding etc. in the past, Figure 7AAs shown in the end view, the lower end of the protrusion is formed into a straight line across the long side. This is because the mold shape is limited and the sealing area of ​​the sealed laminated parison is as close to the ground plane H as possible (see Figure 5C ) above. As a result, the lower end of the protrusion is a linear container, and the protrusion may crack due to the impact of falling or the like.

[0109] However, the inventors conducted a drop experiment on a filled, peelable container and filmed the deformation of the bottom at the moment of impact with a camera. They found that immediately and instantaneously, upon impact, the center of the bottom flipped, protruding downward. As a result, tensile stress concentrated in the longitudinal center of the lower end of the protrusion, causing cracks to form perpendicular to the longitudinal direction (i.e., the short side) in this area.

[0110] Based on this phenomenon, the inventors have come up with a structure with a bent portion 43 to complete the present invention. Figure 5B and Figure 7B As shown, the longitudinal center portion of the lower end of the protrusion 40 is bent upward (toward the inside of the container).

[0111] It should be noted that the structure of providing the bent portion 43 on the protrusion 40 is sufficient to simply bend the shape of the pinch-off portion of the mold. By simply changing the mold shape in this way, in other words, it is not necessary to perform other crack-suppressing processing on the protrusion 40 after the mold is closed, and cracking can be suppressed. Due to this simple structure, the side surface of the protrusion 40 involved in this embodiment (at Figure 5B The surface shown in ) is a flat shape corresponding to the mold shape.

[0112] The curved portion 43 only needs to be slightly curved, and is preferably smaller due to the reduction in area caused by the curvature. This is because if the protrusion 40 is too curved, it will form an excessively concave shape, and the sealing area between the outer shell 12 and the inner bag 14 at the protrusion 40 will be reduced, so that the impact resistance, especially the impact resistance against cracking in the longitudinal direction, will be reduced (it should be noted that Figure 7B The diagram focuses on the bending process and does not represent the correct shape.)

[0113] like Figure 5CAs shown, in the curved portion 43 according to this embodiment, the distance from the top 31t of the bottom surface of the central portion 31, which is the most upward point, to the ground contact surface H is L2, and the distance from the top 31t to the most concave portion 43t of the curved portion 43, where the curved portion 43 is most concave, is L1. The ratio X1 (= L1 / L2) of L1 to L2 is 0.75 to 0.99. The ratio X1 is preferably 0.85 to 0.95, and more preferably 0.88 to 0.93. The specific value of the ratio X1 can be 0.75, 0.76, 0.77, 0.78, 0.79, 0.80, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.90, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, and 0.99, or it can be within the range between any two of the values ​​exemplified here.

[0114] The bent portion 43 of the protrusion 40 according to this embodiment is formed from Figure 5B The arc shape when viewed from the side is shown, Figure 5C The curvature radius Ra of the curved portion 43 shown is greater than that of the same Figure 5C The radius Rb of the bottom portion 30 is large. Specifically, the ratio X2 (= R1 / R2) of the curvature radius Ra of the curved portion 43 to the radius Rb of the bottom portion 30 is preferably 3.0 or greater. The ratio X2 is more preferably 4.0 or greater, further preferably 5.0 to 10, even more preferably 6.0 to 8.0, and most preferably 6.5 to 7.5. The numerical value of the ratio X2 can specifically be 5.0, 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, 5.8, 5.9, 6.0, 6.1, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, 6.9, 7.0, 7.1, 7.2, 7.3, 7.4, 7.5, 7.6, 7.7, 7.8, 7.9, 8.0, 8.1, 8.2, 8.3, 8.4, 8.5, 8.6, 8.7, 8.8, 8.9, 9.0, 9.1, 9.2, 9.3, 9.4, 9.5, 9.6, 9.7, 9.8, 9.9, 10.0, or it can be within the range between any two of the numerical values ​​exemplified here.

[0115] 1-5. Effects

[0116] The longitudinal center portion of the lower end of the protrusion 40 of the peelable container 1 according to this embodiment is curved upward. Therefore, when the central portion 31 of the bottom 30 protrudes (expands) downward from the bottom surface, the longitudinal stress applied to the longitudinal center portion of the lower end of the protrusion 40 is not tensile but compressive. Consequently, cracking in the transverse direction of the central portion can be suppressed.

[0117] Furthermore, by making the curved portion 43 slightly curved, cracking in the short-side direction can be suppressed at the central portion, while ensuring a sealing area at the protruding portion 40 to suppress cracking in the long-side direction.

[0118] Furthermore, by curving the longitudinal center portion of the lower end of the protrusion 40 upward, even if the bottom surface expands and protrudes downward, the longitudinal center portion of the lower end of the protrusion 40 does not protrude further downward than the contact surface H defined by the peripheral portion 32. This prevents the container from tipping over.

[0119] Sometimes, the container 17 is filled with hot contents (hot packing), and shrink film is applied to the container 17 while the container 1 is heated. Since the container 1 softens during heating, applying the shrink film while the container 1 is heated can compress the container 17 during installation, potentially causing the protrusion 40 to tilt downward, deforming the container 1 (i.e., protruding backward). This can cause the protrusion 40 to protrude from the ground contact surface H, making the container prone to tipping over. However, the container of this embodiment has a curved portion 43 at the lower end of the protrusion 40, making it less likely to deform downward, thereby preventing the container 1 from protruding backward.

[0120] 1-6. Modifications

[0121] It should be noted that the present invention can also be implemented in the following manner.

[0122] In the above embodiment, while the protrusion 40 is formed from the tapered portion 41 and the thin-walled portion 42, the thin-walled portion 42 is not essential. Without the thin-walled portion 42, the same effects as in the above embodiment can be achieved by curving the longitudinal center of the lower end of the tapered portion 41 upward. Furthermore, the cross-sectional shape of the protrusion 40 may not be tapered, but may instead have a rectangular cross-section, for example.

[0123] In the above embodiment, if Figure 7B As shown in the schematic diagram of FIG, the lower end of the protrusion 40 is bent almost across the long side direction. Figure 8A As shown in FIG. 4 , the lower end of the protrusion 40 may also be formed into a shape that is bent upward only in the center portion in the longitudinal direction. Figure 8B As shown in FIG, the bent portion at the lower end of the protrusion 40 may include the center of the long side of the protrusion and be slightly offset from the center. These shapes can also suppress cracking in the short side direction at the central portion.

[0124] 2. Second embodiment of the first aspect

[0125] use Figures 9 to 12BA peelable laminate container 1 according to a second embodiment of the first aspect of the present invention will be described. The container 1 according to this embodiment is similar to the first embodiment of the first aspect, with the main difference being the structure of the inner bottom surface 1a of the container 1. The following description will focus on this difference.

[0126] In this embodiment, the inner bottom surface 1a is curved, convex toward the inside of the container. The radius of curvature C1 in the central region P1 of the container 1 is smaller than the radius of curvature C2 in the surrounding region P2. This structure reduces the downward deformation of the protrusion 40. Therefore, downward deformation of the protrusion 40 can be suppressed when shrink film is applied immediately after a hot compress.

[0127] C1 / C2 is 0.1 to 0.9, preferably 0.2 to 0.6, specifically 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, or 0.9, and may be within the range between any two of the values ​​exemplified here.

[0128] Suppose the distance from the center C of the container to the boundary between areas P1 and P2 is Y1, and the distance from the center C of the container to the lowest part 32b at the periphery of the inner bottom surface 1a is Y2, then Y1 / Y2 is 0.1~0.9, preferably 0.2~0.6, specifically it can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or it can be within the range between any two of the values ​​exemplified here.

[0129] The shape of the inner bottom surface 1a described in the second embodiment of the first aspect can also be applied to a container without the protrusion 40. Even in such a case, the curvature radius C1 being smaller than the curvature radius C2 can suppress downward deformation of the protrusion 40.

[0130] 3. Other Implementations of the First Aspect

[0131] While the above embodiment describes the peelable container 1 as an example, the present invention is also applicable to containers other than peelable containers. Specifically, by bending the longitudinal center region, including the lower end of the protrusion, upward, any container having a protrusion can alleviate stress in the longitudinal center region, thereby suppressing cracking.

[0132] (Implementation of the Second Aspect)

[0133] 1. Description of the structure of the laminated peeling container 1

[0134] like Figure 13A to Figure 14As shown, the peelable container 1 includes a container body 3 and a valve member 4. The container body 3 includes a trunk portion 7 for accommodating contents, a shoulder portion 8 for accommodating contents, and a mouth portion 9 for discharging the contents in the container body 3 to the outside of the container body 3. Figure 17B As shown, the mouth 9 is installed with a pressure cover Cp. That is, the mouth 9 is a press-type structure mouth, and the pressure cover Cp is installed on the mouth 9 by pressing on the mouth 9. It should be noted that Figure 17B In the figure, the dotted line schematically indicates the pressure cap Cp.

[0135] 1-1. Container body 3

[0136] 1-1-1. Outer shell 12 and inner bag 14

[0137] The container body 3 comprises an outer shell 12 and an inner bag 14 on the body portion 7, shoulder portion 8, and mouth portion 9. As the contents decrease, the inner bag 14 peels away from the inner surface of the outer shell 12, separating and shrinking from the inner surface of the outer shell 12. The outer shell 12 is thicker than the inner bag 14 to improve resilience. The outer shell 12 is composed of, for example, low-density polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, ethylene-propylene copolymers, and mixtures thereof. The outer shell 12 can be constructed from multiple layers. The inner bag 14 is preferably constructed from multiple layers. For example, the layer in contact with the outer shell 12 can be an ethylene-vinyl alcohol copolymer (EVOH) layer made of EVOH resin, while the layer in contact with the contents can be an inner layer made of a polyolefin, such as low-density polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, ethylene-propylene copolymers, and mixtures thereof. An adhesive layer is preferably used between the EVOH layer and the inner layer.

[0138] 1-1-2. Trunk 7

[0139] like Figure 13A and Figure 13B As shown, the trunk portion 7 is a bottomed cylindrical member. The trunk portion 7 comprises an upper portion 7A, a constricted portion 7B, and a bottom portion 7C. The outer diameter of the constricted portion 7B is smaller than that of the upper portion 7A, making it easier for the user to grip the constricted portion 7B. The upper portion 7A is connected to the shoulder portion 8.

[0140] 1-1-2. Shoulder 8

[0141] like Figure 14 and Figure 16 As shown, the upper end of the shoulder 8 is connected to the mouth 9, and the lower end of the shoulder 8 is connected to the trunk 7. Figure 18 As shown, the shoulder 8 is convexly protruded from the inner space S2 side of the container body 3 toward the outer space S1 side of the container body 3, so that the container body 3 is in a shape that is easy to ensure the inner volume. Figure 18As shown, the position of the inner surface of the base portion 9A, which will be described later, is defined as position P1, the position of the inner surface of the portion where the curved surface portion 8B connects to the upper portion 7A is defined as position P2, and the straight line passing through positions P1 and P2 is defined as imaginary line G. The shoulder portion 8 protrudes convexly from the imaginary line G toward the direction Dr of the external space S1. In other words, the entire shoulder portion 8 protrudes convexly toward the direction Dr.

[0142] The shoulder 8 has a flat surface 8A and a curved surface 8B. The flat surface 8A is provided above the curved surface 8B. The flat surface 8A is formed as an annular member, and the flat surface 8A is formed in a flat plate shape. The inner edge of the flat surface 8A contacts the mouth 9, and the outer edge of the flat surface 8A is connected to the curved surface 8B. The flat surface 8A is inclined downward from the mouth 9 side to the curved surface 8B side. The curved surface 8B is formed in a cylindrical shape. The upper end of the curved surface 8B is connected to the flat surface 8A, and the lower end of the curved surface 8B is connected to the trunk 7. The curved surface 8B is inclined downward from the flat surface 8A side to the trunk 7, and the inclination angle of the outer surface of the curved surface 8B is larger than the inclination angle of the outer surface of the flat surface 8A.

[0143] like Figure 13A 、 Figure 13B 、 Figure 15A and Figure 15B As shown, reinforcing recesses Rf and Rr are formed at the shoulder 8. One of the reinforcing recess Rf and the reinforcing recess Rr corresponds to the first reinforcing recess, and the other corresponds to the second reinforcing recess. The reinforcing recesses Rf and Rr reinforce the root 9A of the mouth 9. That is, by forming the reinforcing recesses Rf and Rr at the shoulder 8, the root 9A is reinforced by the reinforcing recesses Rf and Rr, thereby suppressing the mouth 9 from bending and retreating to the shoulder 8 side. The reinforcing recess Rf is formed on the front side of the container body 3, and the reinforcing recess Rf is formed on the back side of the container body 3. The reinforcing recesses Rf and Rr are arranged at 180 degrees with respect to the central axis of the shoulder 8 as a reference. In other words, the reinforcing recess Rf, the point on the central axis of the shoulder 8, and the reinforcing recess Rr are arranged in a straight line. The reinforcing recesses Rf and Rr are arranged at 180 degrees with respect to the central axis of the shoulder 8 , thereby suppressing deviation of the reinforcing regions of the reinforcing recesses Rf and Rr and more reliably suppressing bending and retreat of the mouth 9 toward the shoulder 8 .

[0144] 1-1-3. Mouth 9

[0145] The mouth 9 is connected to the upper part of the trunk 7. The mouth 9 is a cylindrical part. Figure 17A and Figure 17BAs shown, the mouth 9 has a root 9A, a standing portion 9B, an expanded diameter portion 9D, a wall portion 9E, a mounting protrusion 9C, a front tapered wall portion 9F, and an upper end portion 9G of the mouth. The root 9A is the portion where the mouth 9 is connected to the shoulder 8, that is, the portion provided at the root of the mouth 9. The root 9A is formed in such a way that the flat surface 8A is raised upward. The height dimension of the root 9A, that is, the amount of the upward rise of the root 9A is, for example, 0.5mm~2.0mm. In addition, the size of the difference between the inner and outer diameters of the root 9A is 0.5mm~2.0mm. The outer surface of the root 9A is arranged to be inclined from the standing portion 9B to the flat surface 8A. That is, the outer surface of the root 9A is conical. The standing portion 9B extends in the vertical direction. That is, the standing portion 9B is a straight cylindrical portion. The diameter of the standing portion 9B is smaller than the diameter of the root 9A. As Figure 14 、 Figure 17A and Figure 17B As described above, the mouth 9 is formed with a necking shape 9H from the root 9A, the upright portion 9B to the expanded portion 9D. The expanded portion 9D extends in a direction substantially perpendicular to the central axis of the container body 3. The inner side of the expanded portion 9D is connected to the upright portion 9B, and the outer side of the expanded portion 9D is connected to the wall portion 9E. The wall portion 9E extends to rise upward. The upper end of the wall portion 9E is connected to the mounting protrusion 9C. The mounting protrusion 9C is the portion for mounting the pressure cap Cp, and the outer diameter of the mounting protrusion 9C is the largest among the outer diameters of the mouth 9. The tapered wall portion 9F is a wall portion formed from the side of the mounting protrusion 9C to the side of the upper end portion 9G of the mouth, which is tapered at the front end. The upper end portion 9G of the mouth corresponds to the content flow outlet in the container body 3, and the upper end portion 9G of the mouth is located at the uppermost portion of the mouth 9.

[0146] 1-2. Valve component 4

[0147] like Figure 17A As described above, the valve member 4 is mounted in the external air inlet hole 15 formed in the trunk portion 7 to regulate the flow of air between the intermediate space 21 between the outer shell 12 and the inner bag 14 and the external space S1. The external air inlet hole 15 is a through-hole provided only in the outer shell 12 and does not reach the inner bag 14. The valve member 4 includes a cylindrical body 5 that allows communication between the intermediate space 21 and the external space S1, and a movable body 6 housed and movable within the cylindrical body 5. The cylindrical body 5 and the movable body 6 are formed by injection molding or the like. The movable body 6 is preferably spherical.

[0148] 2. Detailed description of the enhanced concave part

[0149] 2-1. Reinforcement of the concave portion Rf

[0150] like Figure 14 、 Figure 19A and Figure 19BAs shown, the reinforcement recess Rf is formed over the base 9A, flat surface 8A, and curved surface 8B of the mouth 9. In other words, the reinforcement recess Rf is not only formed on the curved surface 8B and flat surface 8A, but also extends from the curved surface 8B side to the base 9A. In other words, the reinforcement recess Rf is formed so as to extend from the curved surface 8B to the base 9A. The reinforcement recess Rf includes a first recess R1 and a second recess R2. The first recess R1 is connected to the second recess R2, and the first recess R1 extends linearly from the portion connected to the second recess R2 to the base 9A. The second recess R2 is generally circular, and the valve member 4 is disposed in the second recess R2.

[0151] like Figure 14 、 Figure 17A 、 Figure 20A and Figure 20B As shown, the shoulder 8 has a bottom wall portion 8a1, a pair of side wall portions 8a2, a circular wall portion 8a3, and an arcuate wall portion 8a4. The side wall portion 8a2 of one of the pair of side wall portions 8a2 corresponds to the first side wall portion, and the side wall portion 8a2 of the other side corresponds to the second side wall portion. The first recess R1 is formed by the bottom wall portion 8a1 and the pair of side wall portions 8a2, and the second recess R2 is formed by the circular wall portion 8a3 and the arcuate wall portion 8a4. The bottom wall portion 8a1 is arranged to span the root portion 9A, the flat surface portion 8A, and the curved surface portion 8B. Similarly, the pair of side wall portions 8a2 are arranged to span the root portion 9A, the flat surface portion 8A, and the curved surface portion 8B. As shown Figure 20A As shown, one side wall portion 8a2 is connected to one side end of the bottom wall portion 8a1, and the other side wall portion 8a2 is connected to the other side end of the bottom wall portion 8a1. The angle formed by the bottom wall portion 8a1 and each side wall portion 8a2 is greater than 90 degrees. Figure 17A As shown, the outer surface of the bottom wall portion 8a1 and the outer surface of the circular wall portion 8a3 are inclined surfaces, and the inclination angle of the outer surface of the circular wall portion 8a3 is larger than the inclination angle of the outer surface of the bottom wall portion 8a1.

[0152] like Figure 14As shown, the bottom wall portion 8a1 has an upper end portion a1, a middle portion a2, and a lower end portion a3. The inclination angles of the outer surfaces of the upper end portion a1, the middle portion a2, and the lower end portion a3 are identical. In other words, the inclination angle of the outer surface of the bottom wall portion 8a1 is constant. Here, the inclination angle of the bottom wall portion 8a1 does not decrease from the middle portion a2 to the upper end portion a1, but rather remains constant from the flat surface portion 8A side to the root portion 9A. In other words, the bottom wall portion 8a1 maintains its inclination angle, extending from the flat surface portion 8A side to the root portion 9A. Although the inclination angle of the upper end portion a1 is smaller than that of the middle portion a2, the bottom wall portion 8a1 is located to one side of the side of the mouth portion 9, making it difficult for the bottom wall portion 8a1 to support the mouth portion 9. However, in this embodiment, bottom wall portion 8a1 maintains an inclination angle from middle portion a2 to upper end portion a1 until reaching base portion 9A. Bottom wall portion 8a1 is located closer to and directly below mouth portion 9, thereby enabling bottom wall portion 8a1 to more reliably support mouth portion 9. External air inlet hole 15 is formed in circular wall portion 8a3, and valve member 4 is mounted on circular wall portion 8a3. Arc-shaped wall portion 8a4 is connected to the periphery of circular wall portion 8a3.

[0153] like Figure 14 As shown, the width of the bottom wall portion 8a1 from the lower end a3 to the upper end a1 is constant. The width here refers to the width in a direction parallel to the direction from one side wall portion 8a2 toward the other side wall portion 8a2. If the width of the upper end a1 gradually narrowed toward the root portion 9A, the bottom wall portion 8a1 would have difficulty supporting the mouth portion 9. However, in this embodiment, since the width of the bottom wall portion 8a1 from the lower end a3 to the upper end a1 is constant, the bottom wall portion 8a1 can more reliably support the mouth portion 9.

[0154] 2-2. Reinforcement of the concave portion Rr

[0155] like Figure 16 、 Figure 19A and Figure 19B As shown, the reinforcement recess Rr is formed over the same range as the reinforcement recess Rf, extending across the base 9A, flat surface 8A, and curved surface 8B of the mouth 9. In other words, the reinforcement recess Rr is not formed solely on the curved surface 8B and flat surface 8A, but rather extends from the curved surface 8B side to the base 9A. In other words, the reinforcement recess Rr is formed so as to extend from the curved surface 8B to the base 9A.

[0156] like Figure 16 、 Figure 17A and Figure 20AAs shown, the shoulder 8 has a bottom wall portion 8b1 and a pair of side wall portions 8b2. One side wall portion 8b2 of the pair of side wall portions 8b2 corresponds to the first side wall portion, and the other side wall portion 8b2 corresponds to the second side wall portion. The reinforced recess Rr is formed by the bottom wall portion 8b1 and the pair of side wall portions 8b2. The bottom wall portion 8b1 is provided to span the root portion 9A, the flat surface portion 8A, and the curved surface portion 8B. Similarly, the pair of side wall portions 8b2 are provided to span the root portion 9A, the flat surface portion 8A, and the curved surface portion 8B. As shown Figure 20A As shown, one side wall portion 8b2 is connected to one side end of the bottom wall portion 8b1, and the other side wall portion 8b2 is connected to the other side end of the bottom wall portion 8b1. The angle formed by the bottom wall portion 8b1 and each side wall portion 8b2 is greater than 90 degrees. Figure 17A As shown, the outer surface of the bottom wall portion 8b1 is an inclined surface.

[0157] like Figure 16 As shown, the bottom wall 8b1 has an upper end b1, a middle portion b2, and a lower end b3. The outer surface of the upper end b1 has the same inclination angle as the outer surface of the middle portion b2. It should be noted that the outer surface of the lower end b3 has a smaller inclination angle than the outer surface of the upper end b1. Furthermore, the inclination angle of the bottom wall 8b1 does not decrease from the middle portion b2 to the upper end b1; the bottom wall 8b1 remains constant from the flat surface 8A side to the root 9A. In other words, the bottom wall 8b1 maintains its inclination angle while extending from the flat surface 8A side to the root 9A. Because the bottom wall 8b1 maintains its inclination angle from the middle portion b2 to the upper end b1 and reaches the root 9A, it is located closer to the bottom below the mouth 9, allowing it to more reliably support the mouth 9.

[0158] like Figure 16 As shown, the width of bottom wall 8b1 is constant from lower end b3 to upper end b1. The width here refers to the width in a direction parallel to the direction from one side wall 8b2 toward the other side wall 8b2. This allows bottom wall 8b1 to more reliably support mouth 9.

[0159] 3. Method for manufacturing a laminated peelable container

[0160] Next, an example of a method for manufacturing a peelable laminated container 1 will be described. A molten laminated parison is extruded from an extruder and placed into a split mold for blow molding, which is then closed. Next, a blow nozzle is inserted into the opening on the mouth 9 side of the container body 3, and air is blown into the cavity of the split mold while the mold is closed. The split mold is then opened and the blow-molded product is removed. Next, an air intake hole 15 is formed in the outer shell 12 of the container body 3 of the peelable laminated container 1. It should be noted that when forming the air intake hole 15, the peeling tool is brought into contact with the container body 3 while the container body 3 is mounted in the support mold. With the container body 3 mounted in the support mold, the reinforcing recess Rr engages with the support mold. In other words, the reinforcing recess Rr not only serves to reinforce the base 9A of the mouth 9 but also serves to axially position the container body 3 during the formation of the air intake hole 15.

[0161] 4. Effects of implementation methods

[0162] There is a demand for larger volumes (e.g., 600 ml or more) for the container body 3 of the peelable container 1. When increasing the volume of the container body 3, the shape of the mouth 9 generally does not need to be changed. Increasing the diameter of the mouth 9 would render the existing lid unusable. Furthermore, increasing the diameter of the mouth 9 would hardly increase the volume of the container body 3. Therefore, when increasing the volume of the container body 3, for example, the diameter of the shoulder 8 or the trunk 7 can be increased. If the amount of laminated parison used to manufacture a single container body 3 is constant, increasing the diameter of the shoulder 8 or the trunk 7 will cause the laminated parison within the split mold to stretch accordingly. In other words, while the thickness of the shoulder 8 or the trunk 7 tends to be thinner than the thickness of the mouth 9, increasing the diameter of the shoulder 8 or the trunk 7 will result in a tendency for the thickness of the shoulder 8 or the trunk 7 to be even thinner than the thickness of the mouth 9. When the shoulder portion 8 is thin, the mouth portion 9 is easily bent and retracted by the shoulder 8. Specifically, as the volume of the container body 3 increases, the shoulder 8 tends to become thinner, making the mouth portion 9 (base portion 9A) more likely to bend and retract by the shoulder 8. The shoulder portion 8 of the container body 3 of the peelable container 1 according to this embodiment is formed with reinforcing recesses Rf and Rr. These recesses Rf and Rr function as ribs to support the mouth portion 9.

[0163] Specifically, the reinforcing recesses Rf and Rr are formed in the shoulder portion 8, forming walls (bottom walls 8a1 and 8b1 and side walls 8a2 and 8b2) above these recesses. These walls are formed upright, making them more resistant to external forces acting in the vertical direction (parallel to the central axis of the container body 3) than the flat surface 8A and curved surface 8B. In other words, when external forces act in the vertical direction against the mouth 9, these walls can function as reinforcing ribs at the mouth 9 (root 9A). In this embodiment, the reinforcing recesses Rf and Rr extend to the root 9A, so the walls functioning as ribs also extend to the root 9A. This supports the root 9A from a position directly below the root 9A by these walls. The container body 3 of the separable container 1 according to this embodiment has enhanced resistance to forces that could cause the root 9A to dig into the shoulder portion 8. Therefore, even if the volume of the container body 3 increases and the thickness of the shoulder 8 is thinner than the thickness of the mouth 9, the mouth 9 (base 9A) of the container body 3 of the laminated and peelable container 1 according to this embodiment can be prevented from bending and retreating toward the shoulder 8.

[0164] The shoulder 8 of the container body 3 of the separable container 1 according to this embodiment projects convexly from the interior space S2 of the container body 3 toward the exterior space S1 of the container body 3. Therefore, the container body 3 has a shape that meets the demand for a larger volume. However, if the shoulder 8 projects convexly from the interior space S2 of the container body 3 toward the exterior space S1 of the container body 3, it becomes difficult for the shoulder 8 to support the mouth 9 from a position directly below the mouth 9. As a result, when external force is applied to the mouth 9, the mouth 9 (root 9A) tends to bend and retreat toward the shoulder 8. The shoulder 8 of the container body 3 of the separable container 1 according to this embodiment is formed with reinforcing recesses Rf and Rr, which function similarly to the ribs described above. In this embodiment, the reinforcing recesses Rf and Rr extend to the root 9A, so the wall portion, which functions as a rib, also extends to the root 9A. This allows the root 9A to be supported by the wall portion from a position directly below the root 9A. As a result, the root portion 9A increases its resistance to the action of being embedded in the shoulder portion 8 , thereby suppressing the mouth portion 9 (root portion 9A) from bending and retreating toward the shoulder portion 8 .

[0165] It should be noted that the wall portions (bottom wall portions 8a1, 8b1 and side wall portions 8a2, 8b2) may be vertical. In this manner, the root portion 9A is supported by the wall portions from a position directly below the root portion 9A, thereby further preventing the mouth portion 9 (root portion 9A) from bending and retreating toward the shoulder portion 8.

[0166] In this embodiment, the reinforcing recesses Rf and Rr reach the root 9A. Therefore, even if the shoulder 8 does not exceed the necessary thickness, the container body 3 can still ensure resistance to the root 9A being embedded in the shoulder 8.

[0167] In this embodiment, the pressure cap Cp is pressed on the mouth portion 9 and thus installed on the mouth portion 9. Figure 17B As shown, when the pressure cap Cp is pressed and installed on the mouth portion 9, a force Fc acts on the mouth portion 9 to bend and retreat to the shoulder portion 8 side. Figure 17B As shown, the lower end Cp1 of the press cap Cp is positioned above the upright portion 9B of the mouth 9, and a gap Sp is provided at the mouth 9 that is wider than the gap between the lower end Cp1 of the press cap Cp and the shoulder 8 of the container body 3. The gap Sp is provided on the mouth 9 to support the mouth 9 when the press cap Cp is pressed against the mouth 9, necessitating the placement of a support jig T at the expanded diameter portion 9D. Consequently, the provision of the gap Sp at the mouth 9 forms a constricted shape 9H at the lower portion of the mouth 9. If the reinforcing recesses Rf and Rr did not form the shoulder 8, the mouth 9 would be more likely to deform and recede toward the shoulder 8 when the container body 3 (the peelable laminated container 1) is dropped. Note that the constricted shape 9H remains visible even when the press cap Cp is attached to the mouth 9. Therefore, if the press cap Cp is attached to the mouth 9 without forming the reinforcing recesses Rf and Rr on the shoulder 8, the mouth 9 is more likely to bend and retreat toward the shoulder 8 when the container body 3 (the separable laminated container 1) is dropped. In contrast, the reinforcing recesses Rf and Rr are formed on the shoulder 8 of the container body 3 of the separable laminated container 1 according to this embodiment as described above. This prevents the mouth 9 from bending and retreating toward the shoulder 8, even if the lower portion of the mouth 9 has a constricted shape 9H. Therefore, regardless of whether the press cap Cp is attached to the mouth 9, the effect of preventing the mouth 9 from bending and retreating toward the shoulder 8 is maintained.

[0168] 5. Enhance the formation range of concave parts Rf and Rr

[0169] In this embodiment, although the example in which the reinforcing recesses Rf and Rr extend from the curved surface portion 8B to the root portion 9A is described, the present invention is not limited to this embodiment. Figure 13A to Figure 13C As shown, the reinforcing recesses Rf and Rr may extend from the flat surface 8A side to a position hidden in the mouth 9 (mounting protrusion 9C) when the container body 3 is viewed from the upper surface. Figure 17BAs shown, the upper end portions of the reinforcing recesses Rf and Rr are located closer to the central axis of the container body 3 than the imaginary line L extending vertically from the mounting protrusion 9C. The container body 3 having this structure can achieve the same effect as the above-mentioned embodiment. It should be noted that although the laminated peeling container 1 involved in this embodiment is a form having a mouth portion 9 on which a pressure cap Cp is installed, it is not limited to this form. It is also possible to use a screw-type cap on the lid of the laminated peeling container 1 instead of the pressure cap Cp, and to form a threaded portion that screws into the screw-type cap on the mouth portion 9 instead of the mounting protrusion 9C. Even if the container body 3 has this structure, it can still achieve the same effect as the above-mentioned embodiment.

[0170] (Implementation of the Third Aspect)

[0171] like Figure 21 As described above, the delamination container 1 according to one embodiment of the third aspect of the present invention includes a lid 2, a container body 3, and a valve member 4. The container body 3 includes a receiving portion 17 for receiving contents and a mouth portion 9 for discharging the contents from the receiving portion 17.

[0172] like Figure 22 As shown, the container body 3 includes an outer shell 12 and an inner bag 14 at the housing portion 17 and the mouth portion 9. As the content decreases, the inner bag 14 is peeled off from the outer shell 12, and the inner bag 14 is separated from the outer shell 12 and shrinks.

[0173] The outer shell 12 is formed thicker than the inner bag 14 to enhance its resilience. The outer shell 12 can be made of, for example, low-density polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, ethylene-propylene copolymers, and mixtures thereof. The outer shell 12 can be constructed from multiple layers. The inner bag 14 is preferably constructed from multiple layers. For example, a layer composed of ethylene-vinyl alcohol copolymer (EVOH) resin can be used as the layer in contact with the outer shell 12, while an inner surface layer composed of a polyolefin such as low-density polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, ethylene-propylene copolymers, and mixtures thereof can be used as the layer in contact with the contents. An adhesive layer is preferably used between the EVOH layer and the inner surface layer.

[0174] The cover 2 is mounted on the mouth 9 of the container body 3. In this embodiment, the cover 2 is threaded, but it can also be mounted by pressing. Figure 21 As described above, the lid 2 includes a lid body 20 and a lid cover 22 formed of synthetic resin. The lid body 20 and the lid cover 22 are connected by a hinge 23, and the lid cover 22 can be opened and closed. The lid body 20 includes a main lid component 24, a check valve 26, and a pouring component 29. Figure 22-23 The cover 22 is omitted in the figure.

[0175] The main cover member 24 forms the outer shape of the cover 2 and includes a cylindrical outer tube portion 24o, a top plate portion 24t, an annular protrusion 24p, and a threaded groove 24e. The top plate portion 24t extends inward from the upper end of the outer tube portion 24o, while the annular protrusion 24p extends downward from the inner edge of the top plate portion 24t. The outer circumferential surface of the annular protrusion 24p abuts the inner circumferential surface of the mouth portion 9. The threaded groove 24e is formed on the inner circumferential surface of the outer tube portion 24o and engages with the engaging portion of the mouth portion 9.

[0176] The check valve 26 is mounted on the annular protrusion 24p. Figure 24-25 As shown, the check valve 26 includes a main body 26a, a cover 26b, and a hinge 26c. The main body 26a is cylindrical and has a through hole 26a1. The cover 26b is configured to open and close the through hole 26a1. The cover 26b has an inclined surface 26b1. The inclined surface 26b1 abuts against the edge of the through hole 26a1, and the through hole 26a1 is closed, so that the check valve 26 is in a closed state. The main body 26a and the cover 26b are connected by a hinge 26c. The hinge 26c is configured to be elastically deformable, and the cover 26b rotates around the hinge 26c as a center due to the elastic deformation of the hinge 26c. In this way, the through hole 26a1 is opened, so that the check valve 26 is in an open state.

[0177] The check valve 26 is preferably formed of an elastic body such as a rubber material, and is preferably formed integrally with a main body portion 26 a , a cover portion 26 b , and a hinge portion 26 c .

[0178] The angle α between the inner surface 26a2 of the main body 26a and the inclined surface 26b1 of the cover 26b is not particularly limited, but is preferably at least 25.1 degrees, and more preferably at least 25.5 degrees. The angle α can range from 25.1 to 40 degrees, and specifically can be 25.1, 25.5, 26, 26.5, 27, 27.5, 28, 28.5, 29, 29.5, 30, 35, or 40 degrees, or can be within a range between any two of the values ​​exemplified here. If the angle α is too small, the cover 26b may not fit into the through hole 26a1, making it difficult for the check valve 26 to open. Setting the angle α to at least 25.1 degrees facilitates the opening of the check valve 26.

[0179] The pouring member 29 includes a thin disk portion 29d, a pouring spout 29m, and an engaging portion 29e. The pouring spout 29m is formed in the center of the disk portion 29d, and the engaging portion 29e engages with the inner edge of the top plate portion 24t of the main cover member 24. The pouring member 29 prevents dripping when discharging the contents and facilitates control of the discharging direction.

[0180] like Figure 22As shown, the valve member 4 is mounted on the external air inlet hole 15 formed in the housing portion 17, and is used to regulate the flow of gas between the intermediate space 21 between the outer shell 12 and the inner bag 14 and the external space S. The external air inlet hole 15 is a through hole provided only on the outer shell 12 and does not reach the inner bag 14. Figure 22 、 Figure 26A as well as Figure 26B As shown, the valve member 4 includes a cylindrical body 5 provided to connect the intermediate space 21 with the external space S, and a movable body 6 accommodated and movable in the cavity 50. The cylindrical body 5 and the movable body 6 are formed by injection molding or other methods. The movable body 6 is preferably spherical.

[0181] like Figures 26A to 28B As shown, the cylinder 5 has: a narrow diameter shaft portion 51 arranged in the external air inlet hole 15; a disc-shaped engaging portion 52, which is provided on the external space S side of the shaft portion 51 to prevent the cylinder 5 from entering the intermediate space 21; and an expanded diameter portion 53, which is provided on the intermediate space 21 side of the shaft portion 51 to prevent the cylinder 5 from being pulled out from the outside of the container body 3. The upper surface 52u of the engaging portion 52 (i.e., the outer surface of the cylinder 5 on the external space S side) is formed with an opening 52o connected to the hollow portion 50. The adjacent area 52a is a circular flat area. In addition, a circular protruding area 52p is formed on the outer side of the adjacent area 52a on the upper surface 52u of the engaging portion 52, which protrudes from the adjacent area 52a toward the external space S side.

[0182] The cavity 50 is a hole that passes through the cylindrical body 5 in the axial direction (a direction perpendicular to the external air inlet 15). In order to accommodate the spherical moving body 6, the axial intermediate space 21 side and the external space S side are narrowed relative to the central portion. Specifically, Figure 28A and Figure 28B As shown, the portion corresponding to the inner side of the engaging portion 52 on the side of the intermediate space 21 of the hollow portion 50 is a truncated cone whose diameter decreases toward the external space S, and a stopper 52s is formed along the circumferential direction to engage with the moving body 6 to block the flow of gas. A pair of supporting portions 53p are formed at two opposing positions on the side of the intermediate space 21 of the hollow portion 50 (see FIG. Figure 26B 、 Figure 28A ), the pair of support portions 53p protrude radially inward and support the moving body 6 housed in the cavity 50. In this embodiment, the support portion 53p has an inclined surface 53p1 inclined toward the external space S, and the moving body 6 abuts against the inclined surface 53p1, thereby supporting the moving body 6.

[0183] Using the above structure, Figure 29A ~such as Figure 29CAs shown, the cross-sectional shape of the cavity 50 at the position corresponding to the engaging portion 52 (cross-section CC) is a circle whose diameter gradually decreases toward the external space S. Furthermore, the cross-sectional shape at the position corresponding to the shaft portion 51 (cross-section DD) is formed by a pair of parallel planar walls 51s and two arcuate walls 51c. These two arcuate walls can be formed by cutting two opposing parts of a circle. The cross-sectional shape at the position corresponding to the expanded portion 53 (cross-section EE) is formed by a pair of parallel planar walls 53s and two arcuate walls 53c. These two arcuate walls 53c can be formed by cutting two opposing parts of a circle. Here, the planar wall 53s is formed by an inclined surface 53p1.

[0184] It should be noted that the support portion 53p has an inclined surface 53p1 inclined toward the external space S, so that when the cylindrical body 5 is formed by injection molding, the support portion 53p as an undercut can be prevented from turning over when the center pin of the hollow portion 50 forming the cylindrical body 5 is pulled out from the intermediate space 21 side. Figure 28A As shown, the support portion 53 p has an inclined surface 53 p 2 inclined toward the intermediate space 21 on the intermediate space 21 side.

[0185] like Figure 26B and Figure 27B As shown, the front end portion of the cylindrical body 5 (the end portion of the expanded diameter portion 53 ) is an annular flat surface 53 e , and the flat surface 53 e is provided with notches 53 n at two locations facing each other in the circumferential direction.

[0186] like Figure 30A As shown, the movable body 6 is introduced into the hollow portion 50 of the cylindrical body 5 with the intermediate space 21 side (the expanded portion 53 side) as described above. Although the cylindrical body 5 is provided with a support portion 53p, the support portion 53p has an inclined surface 53p2, so the movable body 6 can be inserted into the hollow portion 50 by straddling the support portion 53p.

[0187] like Figure 29BAs shown, when the moving body 6 is housed in the hollow portion 50 of the cylindrical body 5, in a cross section (DD cross section) at a position corresponding to the shaft portion 51, the distance d1 between the pair of planar walls 51s is slightly larger than the diameter d2 of the moving body 6. The ratio (d1 / d2) of the distance d1 between the pair of planar walls 51s to the diameter d2 of the moving body 6 is preferably 1.01 to 1.20. This ratio may be 1.01, 1.02, 1.03, 1.04, 1.05, 1.06, 1.07, 1.08, 1.09, 1.10, 1.11, 1.12, 1.13, 1.14, 1.15, 1.16, 1.17, 1.18, 1.19, or 1.20, or may be within a range between any two of the values ​​exemplified here. In the embodiment shown in the figure, d1 / d2=1.09 (d1=2.600 mm, d2=2.381 mm). In addition, the ratio (d3 / d2) of the diameter d3 of the arcuate wall 51c to the diameter d2 of the movable body 6 is preferably 1.02-1.60. This ratio can be 1.02, 1.04, 1.06, 1.08, 1.10, 1.12, 1.14, 1.16, 1.18, 1.20, 1.22, 1.24, 1.26, 1.28, 1.30, 1.32, 1.34, 1.36, 1.38, 1.40, 1.42, 1.44, 1.46, 1.48, 1.50, 1.52, 1.54, 1.56, 1.58, or 1.60, or can be within a range between any two of the values ​​exemplified here. It should be noted that in the embodiment shown in the figure, d3 / d2 = 1.26 (d3 = 3.000 mm, d2 = 2.381 mm). Diameter d3 is preferably larger than distance d1. Such a dimensional relationship enables the movable body 6 to move in the vertical direction (direction perpendicular to the axis) within the cavity 50, and ensures a gas flow path at the gap 50g between the arc-shaped wall 51c and the movable body 6. Figure 29C As shown, in the cross section (EE section) corresponding to the expanded portion 53, the distance d4 between the planar walls 53s is smaller than the diameter d2 of the moving body 6, thereby retaining the moving body 6. However, in the EE section, a gap 50g is formed between the arcuate wall 53c and the moving body 6. This gap 50g allows gas flow to continue unimpeded even when the moving body 6 is retained by the support portion 53p.

[0188] The valve member 4 constructed as described above, Figure 30AAs shown, the expanded portion 53 presses and expands the external air inlet hole 15 while being inserted into the intermediate space 21 to be mounted on the container body 3. When the engaging portion 52 is pressed into contact with the outer surface of the housing 12, the outer circumferential surface of the shaft portion 51 is in close contact with the edge of the external air inlet hole 15, and the valve member 4 is retained on the housing 12. The outer circumferential surface of the shaft portion 51 is in close contact with the edge of the external air inlet hole 15, thereby preventing the gas in the intermediate space 21 from flowing out of the gap between the edge of the external air inlet hole 15 and the cylindrical body 5 when the container body 3 is compressed.

[0189] It should be noted that the cylindrical body 5 is attached to the container body 3 by having the outer circumferential surface of the shaft portion 51 in close contact with the edge of the external air inlet hole 15, so the expanded portion 53 is not essential. Furthermore, the front end of the cylindrical body 5 is provided with a flat surface 53e. Therefore, when the valve member 4 is pressed into the intermediate space 21, even if the front end of the valve member 4 collides with the inner bag 14, the inner bag 14 is not easily damaged. Furthermore, in this embodiment, the stopper 52s is formed inside the engaging portion 52, which is offset from the shaft portion 51 toward the external space S. Therefore, even if the edge of the external air inlet hole 15 presses against the shaft portion 51, the stopper 52s does not deform, thereby effectively preventing gas flow.

[0190] After the valve member 4 is installed in the housing 17, it is covered with shrink film. At this time, the valve member 4 is installed in the valve member installation recess 17a provided in the housing 17 so that the valve member 4 does not interfere with the shrink film. In addition, an air circulation groove 17b is provided along the direction from the valve member installation recess 17a to the mouth 9 so that the valve member installation recess 17a is not sealed by the shrink film (see FIG. Figure 21 ). In addition, the valve member 4 involved in this embodiment is arranged outside the adjacent area 52a of the upper surface 52u of the cylinder 5, and is provided with an annular protruding area 52p protruding from the adjacent area 52a toward the external space S. Therefore, the shrink film can abut against the protruding area 52p, so that the movable body 6 can be brought into contact with the shrink film to prevent the movement of the movable body 6 from being obstructed.

[0191] Should be explained, such as Figure 30BAs described above, in the state where the moving body 6 is engaged with the stopper portion 52s, the height position h1 of the valve member 4 according to the present embodiment in the direction of the outside air introduction hole 15 at the end portion on the outside space side of the moving body 6 (here, based on the outer surface of the housing 12 in the state where the cylinder 5 is mounted on the housing 12, the same applies hereinafter) is higher than the height position h2 of the adjacent region 52a of the cylinder 5 (that is, h1>h2). That is, in the state where the moving body 6 is engaged with the stopper portion 52s, a part of the moving body 6 is configured to fly out from the opening 52o. With such a configuration, even if the cavity portion 50 is narrow, the movement amount of the moving body 6 can still be covered, and thus the valve member can be miniaturized (thinned). Further, when the moving body 6 is engaged with the stopper portion 52s, the height position h1 in the direction of the outside air introduction hole 15 at the end portion on the outside space side of the moving body 6 is lower than the height position h3 of the protruding region 52p (that is, h1<h3). With such a configuration, contact between the moving body 6 and the shrink film can be effectively suppressed.

[0192] The moving body 6 preferably has a weight of 0.0250 g or less. If the moving body 6 is too heavy, when a compressive force is applied to the housing 12 and when the compressive force is released from the housing 12, the moving body 6 cannot move quickly, resulting in poor discharge performance, and in such a case, outside air is likely to flow into the inner bag 14 through the check valve 26. The weight is more preferably 0.0150 g or less, and even more preferably 0.0100 g or less. In such a case, the moving body 6 can move more easily and quickly. The weight of the moving body 6 is preferably 0.0030 or more. If the moving body 6 is too light, the rigidity of the moving body 6 is likely to be insufficient. Specifically, the weight of the moving body 6 can be 0.0030, 0.0040, 0.0050, 0.0060, 0.0070, 0.0080, 0.0090, 0.0100, 0.0110, 0.0120, 0.0130, 0.0140, 0.0150, 0.0200, 0.0250 g, or can be within the range between any two of the values exemplified herein.

[0193] The material of the moving body 6 is not particularly limited and can be any one of resin, metal, or ceramic.

[0194] The moving body 6 preferably has a diameter of 2.356 mm to 2.406 mm. If the moving body 6 is too small or too large, there will be a situation where the moving body 6 cannot move smoothly. Specifically, the diameter of the moving body 6 is 2.356, or can be 2.356, 2.360, 2.365, 2.370, 2.375, 2.380, 2.385, 2.390, 2.395, 2.400, 2.405, 2.406 mm, or can also be within the range between any two of the values exemplified herein.

[0195] Next, the operation of the separable container 1 according to the present embodiment will be described.

[0196] First, open the Figure 21 The cover 22 exposes the pouring part 29, tilts the container body 3 so that the pouring port 29m faces downward, and compresses the outer shell 12 of the container body 3. When the outer shell 12 is compressed while the gas enters the intermediate space 21, the gas in the intermediate space 21 enters the cavity 50 from the side of the expanded diameter portion 53. Figure 30B As described above, the movable body 6 is lifted and brought into contact with the stopper 52s. When the movable body 6 is engaged by the stopper 52s, the flow of gas through the cavity 50 is blocked. Further compression of the outer shell 12 in this state increases the pressure in the intermediate space 21, compressing the inner bag 14.

[0197] When the inner bag 14 is compressed, the internal pressure of the contents within the inner bag 14 increases, pressing the lid 26b. Pressing the lid 26b elastically deforms the hinge 26c, causing the lid 26b to rotate about the hinge 26c. This causes the check valve 26 to open, allowing the contents to be discharged through the pouring port 29m. When the angle α between the inner surface 26a2 of the main body 26a and the inclined surface 26b1 of the lid 26b is less than 25 degrees, the lid 26b becomes embedded in the through hole 26a1, making it difficult to open the through hole 26a1. However, when the angle α is greater than 25.1 degrees, the through hole 26a1 can be opened smoothly.

[0198] Subsequently, when the required amount of contents is discharged, the container body 3 returns to a standing position and the compression force on the outer shell 12 is released, the compression force on the inner bag 14 is also released, so that the internal pressure of the contents in the inner bag 14 is reduced, and the cover portion 26b and the hinge portion 26c return to their original shape, thereby closing the through hole 26a1 and making the check valve 26 closed.

[0199] When the compressive force on the shell 12 is released, the shell 12 will return to its original shape due to its own elasticity. Figure 30B As described above, a force F in the direction of the inner side of the container is applied to the moving body 6 in the intermediate space 21. In this way, the moving body 6 moves toward the bottom surface of the hollow portion 50, forming a Figure 30A In the state shown, the external air is introduced into the intermediate space 21 through the gap between the moving body 6 and the wall surface of the cavity 50. It should be noted that in this embodiment, a gap 50g is formed between the arc-shaped wall 51c and the arc-shaped wall 53c forming the moving body 6 and the cavity 50 (see Figure 29B and Figure 29C ), so especially after the contents are discharged, the cross-sectional area for sucking in external air increases, thereby improving the restoring force of the housing 12.

[0200] It should be noted that if the pressure in the intermediate space 21 decreases before the through hole 26a1 in the check valve 26 is completely closed, external air can easily flow back through the check valve 26 and into the inner bag 14. When the angle α is greater than 25.1 degrees, the through hole 26a1 is difficult to close, making this situation very likely to occur. However, in the valve component structure of this embodiment, as the pressure in the intermediate space 21 decreases, the movable body 6 moves very quickly, thereby preventing external air from being introduced into the intermediate space 21 and causing the intermediate space 21 to be in a depressurized state. Therefore, this embodiment can suppress the flow of external air into the inner bag 14. In the case of the specific structure of the movable body 6, which is spherical, weighs less than 0.0250g, and has a size of φ2.356mm to 2.406mm, it is particularly effective to suppress the flow of external air into the inner bag 14.

[0201] [Example]

[0202] The following examples and comparative examples mainly relate to the invention according to the third aspect.

[0203] 1. Manufacturing of laminated peelable containers

[0204] <Example 1>

[0205] The delamination container 1 according to the above embodiment was manufactured so that the angle α was 26.0 degrees, the distance d1 between the pair of plane walls 51s was 2.600 mm, the diameter d2 of the movable body 6 was 2.381 mm, and the weight of the movable body 6 was 0.096 g.

[0206] <Example 2>

[0207] The debonding container 1 was produced under the same conditions as in Example 1 except that the angle α was set to 24.0 degrees.

[0208] <Example 3>

[0209] The debonding container 1 was manufactured under the same conditions as in Example 1 except that the material of the moving body 6 was not changed and the diameter d2 was changed to 2.350 mm.

[0210] <Example 4>

[0211] The debonding container 1 was manufactured under the same conditions as in Example 1 except that the material of the moving body 6 was not changed and the diameter d2 was changed to 2.410 mm.

[0212] <Example 5>

[0213] The debonding container 1 was manufactured under the same conditions as in Example 1 except that the diameter of the movable body 6 in Example 1 was not changed and the material was changed to a weight of 0.0542 g.

[0214] <Comparative Example 1>

[0215] In Comparative Example 1, Figure 31 The debonding container 1 was manufactured under the same conditions as in Example 1 except that the valve member having the structure shown was inserted into the external air introduction hole 15 and the valve member was moved relative to the housing 12 to open and close the external air introduction hole 15 .

[0216] 2. Discharge test

[0217] The delaminated containers of the examples and comparative examples were filled with water. The outer shell 12 was slightly compressed to determine whether the contents were discharged (discharge performance) and whether the inflow of ambient air into the inner bag 14 was suppressed after half of the contents were discharged (inflow suppression performance). Ten samples were prepared according to the examples and comparative examples, and each was tested.

[0218] All samples of the container of Comparative Example 1 had poor inflow inhibition. All samples of the containers of Examples 1 and 2 had excellent discharge and inflow inhibition, with the container of Example 1 having better discharge than the container of Example 2. The containers of Examples 3 to 5 included a mixture of samples that were excellent in both discharge and inflow inhibition, and samples that were poor in at least one of discharge and inflow inhibition.

[0219]

Explanation of symbols

[0220] 1: Laminating and peeling container, 1a: Inner bottom surface, 2: Lid, 3: Container body, 3r: Valve component mounting recess, 4: Valve component, 5: Cylinder, 6: Moving body, 7: Trunk, 7A: Upper part, 7B: Neck, 7C: Bottom, 8: Shoulder, 8A: Flat surface, 8B: Curved surface, 8a1: Bottom wall, 8a2: Side wall, 8a3: Round wall, 8a4: Arc-shaped wall, 8b1: ​​Bottom wall, 8b2: Side wall, 9: Mouth, 9A: Root, 9B: Standing part, 9C: Mounting protrusion, 9D: Diameter expansion part, 9E: Wall, 9F: Wall, 9G: Upper end of the mouth, 9H: Shape, 9e: Engaging part, 11: Outer layer, 12: Outer shell, 13: Inner layer, 14: Inner bag, 15: External air inlet hole, 17: Accommodation part, 17a: Valve component mounting recess, 17b: Air circulation groove, 20: Cover body, 21: Intermediate space, 22: Cover, 23: Hinge, 24: Main cover part, 24e: Threaded groove, 24o: Outer cylinder, 2 p: annular protrusion, 24t: top plate, 26: check valve, 26a: main body, 26a1: through hole, 26a2: inner surface, 26b: lid, 26b1: inclined surface, 26c: hinge, 29: pouring part, 29d: disk, 29e: engaging part, 29m: mouth, 30: bottom, 31: central part, 31t: top, 32: peripheral part, 32b: lowest part, 33: groove, 40: protrusion, 41: tapered part, 42: thin-walled part, 43: curved part, 43t: most concave part, 50: hollow part, 50g: gap, 51: shaft, 51c: arc-shaped wall, 51s: plane wall, 52 : Engaging portion, 52a: Adjacent area, 52o: Opening, 52p: Protruding area, 52s: Stopper, 52u: Upper surface, 53: Expanded diameter portion, 53c: Arc-shaped wall, 53e: Flat surface, 53n: Notch, 53p: Support portion, 53p1: Inclined surface, 53p2: Inclined surface, 53s: Plane wall, C: Center of container, C1: Curvature radius, C2: Curvature radius, Cp: Pressing cover, Cp1: Lower end, Dr: Direction, E: Area, F: Force, Fc: Force, G: Imaginary line, H: Ground contact surface, L: : Imaginary line, L1: Distance, L2: Distance, P1: Central area, P2: Peripheral area, R1: First recess, R2: Second recess, Ra: Curvature radius, Rb: Radius, Rf: Reinforced recess, Rr: Reinforced recess, S: External space, S1: External space, S2: Internal space, T: Support fixture, a1: Upper end, a2: Middle part, a3: Lower end, b1: Upper end, b2: Middle part, b3: Lower end, d1: Distance, d2: Diameter, d3: Diameter, d4: Distance, h1: Height position, h2: Height position, h3: Height position, α: Angle.

Claims

1. A container comprising a container body, wherein the container body comprises a receiving portion and a protruding portion, wherein: The bottom surface of the receiving portion includes a central portion and a peripheral portion surrounding the central portion. The central portion is recessed relative to the peripheral portion and the bottom portion is suspended. The protrusion is configured to protrude downward from the central portion. The inner bottom surface, which is the bottom surface of the inner side of the container body, is a curved shape convex toward the inner side of the container body. In the region of the inner bottom surface corresponding to the central portion, the curvature radius of the central region of the container body is smaller than the curvature radius of the peripheral region surrounding the central region. The protrusion has a curved portion that curves upward in a region in the longitudinal center including the lower end of the protrusion. The protrusion is shaped so as to be bent upward only at the center portion in the longitudinal direction.

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