Pouring cap for double container and double container

Abstract

To provide a dispenser cap for a double container, and a double container capable of improving a performance related to an air valve while maintaining a performance related to a dispensing valve.SOLUTION: The dispenser cap for the double container includes: a dispensing valve 6 that can open and close a communication port 5b for a content liquid and blocks a flow of the content liquid from a dispensing port 9d to a filling space S, while allowing the flow of the content liquid from the filling space S to the dispensing port 9d; and an air valve 7 that can contact to and separate from at least one of a cap body 9, an inner plug 5 and a discharge valve 6, and blocks a flow of air from a ventilation port 3e to an outside air introduction port 9g, while allowing the flow of the air from the outside air introduction port 9g to the ventilation port 3e, in which the air valve 7 is made of a material having a flexural modulus smaller than that of a material constituting the discharging valve 6.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a dispensing cap for a double container that is attached to a container body including an inner layer body that stores a content liquid and an outer layer body that houses the inner layer body inside, and that causes the content liquid to be dispensed as the outer layer body is pressed, and to a double container in which this dispensing cap is attached to the container body.

Background Art

[0002] In recent years, in containers in which a dispensing cap is attached to a container body that stores a content liquid, for example, a double container (also referred to as a delamination container or a laminated peeling container) using a container body composed of an inner layer body and an outer layer body, as shown in Patent Document 1, is used. This type of outer layer body is flexible and is configured to be able to take in air into an internal space formed between it and the inner layer body through a through-hole (vent hole) that penetrates the front and back. The dispensing cap is provided with an air valve that prevents air from leaking from the internal space to the outside world while allowing air to be introduced from the outside world into the internal space when the internal space is depressurized, and a dispensing valve that closes the filling space normally formed inside the inner layer body while opening the filling space when the pressure in the filling space increases.

[0003] According to a double container having such a configuration, when the outer layer body is pressed and the internal space is pressurized, the pressure in the filling space increases and the dispensing valve opens, as a result of which the content liquid stored in the filling space can be dispensed to the outside world. Also, when the pressing on the outer layer body is released, the internal space is depressurized as the outer layer body returns to its original shape, and thus air is introduced into the internal space from the vent hole, so that only the inner layer body can be reduced in volume and deformed. That is, there is an advantage that the self-standing property of the container is maintained even when the content liquid decreases. Also, since the content liquid can be dispensed without being replaced with outside air, there is an advantage that quality deterioration of the stored content liquid hardly occurs. For this reason, this type of container is being widely used as being suitable for storing seasonings such as soy sauce, sauce, mirin, cooking sake, etc., and cosmetics such as shampoo, conditioner, liquid soap, lotion, etc.

Prior Art Documents

Patent Documents

[0004] Patent Document 1 Japanese Patent Application Laid-Open No. 2011-31932 Summary of the Invention Problems to be Solved by the Invention

[0005] In the pouring cap shown in Patent Document 1, a cap body attached to an outer layer body is provided with an outside air inlet communicating with a vent hole of the outer layer body. An air valve integrated with a pouring valve is disposed inside the cap body. Here, the air valve normally abuts against the back surface of the cap body to block the air flow between the vent hole and the outside air inlet, while when the internal space is in a depressurized state, it elastically deforms so as to separate from the back surface of the cap body, and is configured to allow the air flow between the vent hole and the outside air inlet.

[0006] By the way, when the air valve is not in close contact with the cap body and the airtightness inside the pouring cap is insufficient, when the outer layer body is pressed, the air in the internal space leaks out from the outside air inlet and the filling space cannot be sufficiently pressurized, so it becomes difficult to pour the content liquid as intended. Therefore, in such a pouring cap for a double container, it is necessary to enhance the airtightness inside the pouring cap. On the other hand, if the airtightness is too high, when the outer layer body is restored, outside air cannot be smoothly introduced from the outside air inlet, and problems such as taking time to return to the original shape will occur.

[0007] In addition to or separately from the above problems, depending on the amount and flow rate of the air introduced into the internal space, etc., the air valve may repeatedly contact and separate from the back surface of the cap body while taking in outside air into the cap body. And due to the vibration of the air valve at that time and the vibration of the surrounding air accompanying the vibration of the air valve, a sound may be generated.

[0008] However, since the conventional air valve is integrally formed with the pouring valve, it has been difficult to improve various problems associated with such an air valve while maintaining the functions related to the dischargeability of the content liquid and the shielding property of the filling space.

[0009] In order to solve such problems, an object of the present invention is to provide a pouring cap for a double container and a double container that can improve the performance related to the air valve while maintaining the performance related to the pouring valve.

Means for Solving the Problems

[0010] The present invention is mounted on a container body including an inner layer body having a filling space for accommodating a content liquid, and an outer layer body that partitions an internal space between the inner layer body and has a vent communicating with the internal space, and is a pouring cap for a double container that causes the content liquid in the filling space to be poured out from a spout by pressing the outer layer body. The present invention includes a cap body that covers the vent and is attached to the outer layer body, has the spout, and has an outside air inlet communicating with the vent; a middle plug provided inside the cap body and having a communication port for the content liquid that communicates the filling space and the spout; a pouring valve that can open and close the communication port for the content liquid and blocks the flow of the content liquid from the spout toward the filling space while allowing the flow of the content liquid from the filling space toward the spout; and an air valve that can contact and separate from the pouring valve and blocks the flow of air from the vent toward the outside air inlet while allowing the flow of air from the outside air inlet toward the vent. The middle plug includes a partition wall that closes the filling space and an outer edge wall that extends upward from an outer edge portion of the partition wall. The cap body has a top wall located above the pouring valve and the air valve. The pouring valve includes a first annular wall that surrounds the communication port for the content liquid and is held by the middle plug, a first valve body that is elastically supported by the first annular wall on the radially inner side of the first annular wall and can open and close the communication port for the content liquid, and a flange portion that extends radially outward from the first annular wall and constantly contacts the lower surface of the top wall. The air valve includes a second annular wall that is located radially outside the flange portion and is held by the middle plug, and a second valve body that extends radially inward from the second annular wall and can contact and separate from the lower surface of the flange portion and is thinner than the flange portion. The air valve is made of a material having a smaller flexural modulus than the material constituting the pouring valve. The air valve is held by the middle plug between the flange portion and the partition wall when the second annular wall fits on the inner circumference of the outer edge wall and the flange portion abuts on the second valve body from above. When air is introduced from the outside air inlet, the second valve body elastically deforms and separates from the flange portion. Moreover, the lower surface of the flange portion against which the second valve body abuts is located below the upper surface of the second annular wall, the second valve body extends radially inward from the central portion in the axial direction of the second annular wall, and the air valve is formed symmetrically above and below with reference to the second valve body in a sectional view. It is a pouring cap for a double container.

[0013] The present invention is also a double container composed of the container body and any one of the double-container pouring caps described above.

Advantages of the Invention

[0014] In the double-container pouring cap of the present invention, the air valve can contact and separate from at least one of the cap body, the middle plug, and the pouring valve, and is made of a material having a smaller flexural modulus than the material constituting the pouring valve. Therefore, while devising the shape of the air valve and ensuring sufficient contact with the cap body, etc., when taking in outside air into the pouring cap, it can be more surely separated from the cap body, etc. with the small flexural modulus of the material itself. Thus, problems such as the operability when pouring the content liquid, the restorability of the outer layer body, and the sound can be solved. Further, since the pouring valve is made of a material having a larger flexural modulus than the air valve, it is possible to open and close the communication port for the content liquid with good responsiveness even for the flow of the content liquid having a higher flow resistance than air, and the functions related to the dischargeability of the content liquid and the shielding property of the filling space can be maintained.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Embodiments for Carrying Out the Invention

[0016] Hereinafter, with reference to FIG. 1, an embodiment of the double container according to the present invention will be described. In this specification, etc., the “upper” direction and the “lower” direction refer to the directions in the state where the outer layer body (reference numeral 3) is located below and the lid body (reference numeral 10) is located above as shown in FIG. 1.

[0017] The double container of this embodiment includes a container body 1 (composed of an inner layer body 2 and an outer layer body 3), a pouring cap 4 (composed of an inner stopper 5, a pouring valve 6, an air valve 7, a moving valve 8, and a cap body 9), and a lid 10.

[0018] The inner layer body 2 has a filling space S inside it that can accommodate the content liquid. The inner layer body 2 of this embodiment is made of a thin synthetic resin and is provided so as to be capable of volume reduction and deformation.

[0019] The outer layer body 3 has a cylindrical mouth portion 3a extending along the central axis O. In the mouth portion 3a of this embodiment, the lower portion 3c is formed with a larger diameter than the upper portion 3b whose upper end is open. Also, a male screw portion 3d is provided on the outer peripheral surface of the upper portion 3b. Further, the upper portion 3b is provided with a ventilation port 3e extending in the radial direction and penetrating the upper portion 3b, and on the outer peripheral surface where the ventilation port 3e opens, a notch 3f extending in the vertical direction and dividing the male screw portion 3d is provided. Although not shown, a cylindrical body portion and a bottom portion closing the lower end of the body portion are provided below the mouth portion 3a, and the outer layer body 3 has a bottle-like form. Also, the outer layer body 3 of this embodiment is made of synthetic resin, and the body portion has flexibility.

[0020] Also, an internal space N communicating with the ventilation port 3e is formed between the inner layer body 2 and the outer layer body 3.

[0021] In this embodiment, the inner layer 2 and the outer layer 3 are formed by laminating synthetic resins with low mutual compatibility in a peelable manner. As the synthetic resin constituting the inner layer 2, for example, nylon resin (PA), ethylene vinyl alcohol copolymer resin (EVOH), modified polyolefin resin (e.g., "Admer" (registered trademark) manufactured by Mitsui Chemicals, Inc., etc.), polyethylene terephthalate resin (PET), in addition, polyethylene resin (PE) and polypropylene resin (PP) can be adopted. Also, as the synthetic resin constituting the outer layer 3, for example, polyethylene resin (PE) such as low-density polyethylene (LDPE) and high-density polyethylene resin (HDPE), in addition, polypropylene resin (PP) and polyethylene terephthalate resin (PET) can be adopted. Note that the inner layer 2 and the outer layer 3 may be formed so that each has a single-layer structure by a single synthetic resin, or may be formed so that each has a laminated structure by laminating a plurality of synthetic resins. Such an inner layer 2 and outer layer 3 can be obtained by blow molding a parison in which the synthetic resin material forming the inner layer 2 and the synthetic resin material forming the outer layer 3 are laminated. However, alternatively, a test tube-shaped preform in which the synthetic resin material of the inner layer 2 and the synthetic resin material of the outer layer 3 are laminated is prepared, and this preform is formed by biaxially stretch blow molding, or the inner layer and the outer layer are formed individually, and then the inner layer is disposed inside the outer layer can also be used. Also, although not shown, one or a plurality of adhesive bands extending in the vertical direction and partially joining the inner layer 2 and the outer layer 3 may be provided between the inner layer 2 and the outer layer 3.

[0022] The middle stopper 5 includes a partition wall 5a that is located above the mouth portion 3a and closes the filling space S. The partition wall 5a is provided with an opening (communication port 5b for the content liquid) that penetrates it, and a cylindrical wall 5c that is cylindrical as a whole and has a reduced diameter at the lower part with respect to the upper part.

[0023] In addition, an annular recess 5e that is open upward is provided on the radially outer side of the communication port 5b for the content liquid and the cylindrical wall 5c. An annular seal wall 5d that is in liquid-tight contact with the inner layer body 2 is provided on the lower surface of the partition wall 5a on the radially outer side of the annular recess 5e. Further, an outer edge wall 5f that extends upward is provided at the outer edge portion of the partition wall 5a. At the connecting portion between the partition wall 5a and the outer edge wall 5f, a plurality of ribs 5g that extend along the radial direction are provided at intervals in the circumferential direction inside the outer edge wall 5f. A communication opening 5h that penetrates the outer edge wall 5f is provided at the base of the outer edge wall 5f. The communication opening 5h communicates with the gaps provided between the plurality of ribs 5g described above. The middle plug 5 of the present embodiment is formed of a synthetic resin such as polypropylene (PP).

[0024] The dispensing valve 6 has a function of regulating the flow of the content liquid. The dispensing valve 6 of the present embodiment includes an annular wall (first annular wall 6a) that is centered on the central axis O and whose lower end is supported by the annular recess 5e. Inside the first annular wall 6a in the radial direction, there is a plate-like valve body (first valve body 6b) that is located above the communication port 5b for the content liquid and the cylindrical wall 5c, seats on the partition wall 5a to close the communication port 5b for the content liquid, and leaves a part of the cylindrical wall 5c open, and a connecting piece 6c that elastically connects the first valve body 6b and the first annular wall 6a. The dispensing valve 6 is not limited to connecting the first valve body 6b and the first annular wall 6a by a plurality of connecting pieces 6c such as a three-way valve or a four-way valve. It may also be connected by a single connecting piece 6c such as a one-way valve. A ring-shaped flange portion 6d that extends outward in the radial direction is provided at the upper part of the first annular wall 6a. The dispensing valve 6 of the present embodiment is formed of soft polyethylene (low-density polyethylene).

[0025] The air valve 7 has a function of regulating the flow of air. The air valve 7 of the present embodiment includes an annular wall (second annular wall 7a) centered on the central axis O. The second annular wall 7a is radially inside the outer edge wall 5f as shown in the figure and is placed on the rib 5g. And inside the second annular wall 7a in the radial direction, a valve body (second valve body 7b) in the shape of a plate and extending over the entire circumference of the second annular wall 7a is provided. Further, the second valve body 7b of the present embodiment is provided at the central portion of the second annular wall 7a in the direction along the central axis O and has a symmetric shape in the vertical direction. Also, the tip of the second valve body 7b normally abuts airtightly against the lower surface of the flange portion 6d. Note that the second valve body 7b is elastically deformable, and its tip can also be separated from the lower surface of the flange portion 6d as will be described later.

[0026] Such an air valve 7 is made of a material (for example, rubber or elastomer (as an example, nitrile rubber, butyl rubber, silicone rubber, fluorine rubber, urethane, etc.)) having a smaller bending elastic modulus (softer) than the material constituting the injection valve 6. In the present embodiment, the air valve 7 is formed using a material having a smaller bending elastic modulus than the soft polyethylene constituting the injection valve 6. Note that the magnitude of the bending elastic modulus of the material constituting the injection valve 6 and the material constituting the air valve 7 is determined by the bending elastic modulus when the same-shaped ones are tested in the same environment.

[0027] The moving valve 8 is spherical in the present embodiment and is disposed inside the cylindrical wall 5c and moves along the inner peripheral surface of the cylindrical wall 5c according to the attitude change of the container body 1 or the internal pressure of the filling space S. As shown in FIG. 1, when the container body 1 is in the upright posture, the moving valve 8 seats at the reduced-diameter lower portion of the cylindrical wall 5c, making the cylindrical wall 5c and the filling space S non-communicating.

[0028] The cap body 9 is formed of synthetic resin in the present embodiment and includes a top wall 9a located above the injection valve 6 and the air valve 7, and an outer peripheral wall 9b integrally connected to the outer edge of the top wall 9a and surrounding the mouth portion 3a. On the inner peripheral surface of the outer peripheral wall 9b, an internal thread portion 9c adapted to the external thread portion 3d is provided.

[0029] At the center of the top wall 9a, there is provided a pouring cylinder 9e that extends upward from the edge of the hole penetrating the top wall 9a, and the upper opening thereof serves as a pouring outlet 9d for the content liquid. On the lower surface of the top wall 9a, there is provided an annular recess 9f that opens downward and supports the upper end of the first annular wall 6a. And on the radially outer side of the annular recess 9f, there is provided an outside air inlet 9g that penetrates the top wall 9a in the vertical direction. Further, on the outer edge of the top wall 9a, there are provided claw portions 9h for holding the lid body 10.

[0030] The lid body 10 is formed of synthetic resin in this embodiment, and includes a top wall 10a located above the top wall 9a and a lid body outer peripheral wall 10b integrally connected to the top wall 10a. On the lower surface of the top wall 10a, there is provided a seal cylinder 10c that is inserted inside the pouring cylinder 9e and is in airtight contact with the inner surface of the pouring cylinder 9e. On the inner peripheral surface of the lid body outer peripheral wall 10b, there is provided an engaging convex portion 10d that engages with the claw portions 9h. Further, on the outer peripheral surface of the lid body outer peripheral wall 10b, there is provided a hinge portion 10e that is integrally connected to the outer peripheral wall 9b of the cap body 9. Note that although the lid body 10 of this embodiment is integrally connected to the cap body 9, it may be provided separately from the cap body 9 and detachably attached to the cap body 9 by screws or undercuts.

[0031] In each of the members configured in such a form, the inner stopper 5, the pouring valve 6, the air valve 7, and the moving valve 8 can be assembled as shown in FIG. 2. Specifically, the moving valve 8 is inserted into the cylindrical wall 5c of the inner stopper 5, and after the air valve 7 is placed on the rib 5g, the first annular wall 6a of the pouring valve 6 is inserted inside the annular recess 5e. By assembling in this way, these can be handled as one member. Further, since the air valve 7 and the moving valve 8 do not fall off even when the assembled member is turned upside down, workability is improved. Also, the second valve body 7b of the air valve 7 is provided at the vertical center of the second annular wall 7a and can be attached regardless of the vertical orientation with respect to the inner stopper 5, so workability is excellent also in this regard. Then, by inserting and fitting the assembled member inside the cap body 9, the pouring cap 4 can be obtained. Although there may be prepared a plurality of types of cap bodies 9 depending on design or the like, there is also an advantage that the above-described assembled member can be commonly used.

[0032] After that, by attaching the pouring cap 4 to the container body 1 filled with the content liquid, the double container shown in FIG. 1 can be obtained. Inside the pouring cap 4, a passage (communication passage) through which air passes and communicates from the outside air inlet 9g to the vent hole 3e is formed. The communication passage of the present embodiment passes through the outside air inlet 9g, passes through the gap between the second valve body 7b separated from the lower surface of the flange portion 6d and the flange portion 6d, passes through the gaps provided between the plurality of ribs 5g and the communication opening 5h, and further passes through the spiral gap (or the gap formed by the notch 3f) formed between the male screw portion 3d and the female screw portion 9c to reach the vent hole 3e.

[0033] In such a double container configured as described above, by pressing the body portion of the outer layer body 3, the internal space N is pressurized, and as a result, the pressure in the filling space S increases. Therefore, the content liquid in the filling space S causes the first valve body 6b to rise and flows into the inside of the first annular wall 6a through the gap around the connecting piece 6c from the communication port 5b for the content liquid, and is discharged from the discharge port 9d through the inside of the discharge cylinder 9e. Here, since the above-described communication passage connecting the vent hole 3e and the outside air introduction port 9g is in a non-communicating state with the lower surface of the flange portion 6d and the tip of the second valve body 7b being in airtight contact, the air in the internal space N does not leak to the outside. The moving valve 8 in the cylindrical wall 5c is displaced to the first valve body 6b side (the position shown by the broken line in FIG. 1) by its own weight and the content liquid flowing in from the opening on the lower side of the cylindrical wall 5c in a state where the container body 1 is tilted to discharge the content liquid.

[0034] After that, when the pressing on the outer layer body 3 is released and the body portion starts to recover, the volume of the internal space N increases, so the internal space N becomes a decompressed state. As a result, the tip of the second valve body 7b separates from the lower surface of the flange portion 6d, and the air introduced from the outside air introduction port 9g is introduced into the internal space N through the above-described communication passage. Thus, the outer layer body 3 can be restored while keeping the inner layer body 2 in a volume-reduced deformed state. The air valve 7 of the present embodiment is made of a material having a smaller bending elastic modulus and being softer than the material constituting the discharge valve 6. Therefore, compared with the conventional one in which the discharge valve and the air valve are made of the same material, when air is introduced into the internal space N, the tip of the second valve body 7b is more likely to separate from the lower surface of the flange portion 6d. For this reason, even if the tip of the second valve body 7b presses against the lower surface of the flange portion 6d stronger than expected due to, for example, variations in the shape of the parts or variations during assembly, the outer layer body 3 can be restored with good stability. Also, compared with the conventional one, the possibility that the tip of the second valve body 7b repeatedly contacts and separates from the lower surface of the flange portion 6d when air is introduced into the internal space N is reduced, so the generation of rattling noise can be suppressed.

[0035] When the pressing force on the outer layer body 3 is released, the pressure in the filling space S returns to its original state and the first valve body 6b seats on the upper surface of the partition wall 5a, so that the inflow of outside air from the communication port 5b for the content liquid into the filling space S can be prevented. Here, when the container body 1 is displaced to its original upright posture after the pouring of the content liquid is completed, the moving valve 8 moves downward due to its own weight and the pressure drop in the filling space S. As a result, a space corresponding to the amount of movement of the moving valve 8 is formed inside the upper part of the cylindrical wall 5c, so that the corresponding amount of the content liquid can be drawn back from the pouring cylinder 9e into the cylindrical wall 5c (suck-back function), and dripping from the pouring cylinder 9e can be effectively prevented. Note that the moving valve 8 that has moved downward seats on the reduced-diameter lower part of the cylindrical wall 5c, so that the inflow of outside air from the cylindrical wall 5c into the filling space S can be prevented.

[0036] As described above, the pouring cap for a double container and the double container according to the present invention have been described along specific embodiments. However, the present invention is not limited to such embodiments. For example, in order to exhibit the function of the air valve 7, it is preferable that the tip of the second valve body 7b abuts on the lower surface of the flange portion 6d in that it can be handled as one member as described above. However, the tip of the second valve body 7b may abut on the inner surface of the cap body 9 or on the middle stopper 5 (for example, providing something corresponding to the flange portion 6d on the middle stopper 5). Further, the second valve body 7b was a ring-shaped one extending over the entire circumference of the second annular wall 7a in the above-described embodiment. However, the second valve body 7b may be partially provided in the circumferential direction with respect to the second annular wall 7a, and the other parts may be configured to be sealed so as to exhibit the function of the air valve 7.

Explanation of reference numerals

[0037] 1: Container body 2: Inner layer body 3: Outer layer body 3a: Mouth part 3b: Upper part 3c: Lower part 3d: Male screw part 3e: Vent hole 3f: Notch 4: Pouring cap 5: Middle plug 5a: Partition wall 5b: Communication port for the content liquid 5c: Cylindrical wall 5d: Seal wall 5e: Annular recess 5f: Outer edge wall 5g: Rib 5h: Communication opening 6: Pouring valve 6a: First annular wall 6b: First valve body 6c: Connecting piece 6d: Flange part 7: Air valve 7a: Second annular wall 7b: Second valve body 8: Moving valve 9: Cap body 9a: Top wall 9b: Outer peripheral wall 9c: Female screw part 9d: Pouring outlet 9e: Pouring cylinder 9f: Annular recess 9g: Outside air inlet 9h: Claw part 10: Cover body 10a: Top wall 10b: Outer peripheral wall of the cover body 10c: Seal cylinder 10d: Engaging convex part 10e: Hinge part N: Internal space O: Central axis S: Filling space

Claims

1. A pouring cap for a double container, which is attached to a container body including an inner layer body having a filling space for containing a content liquid and an outer layer body that partitions an internal space between the inner layer body and has a vent communicating with the internal space, and causes the content liquid in the filling space to be poured out from a spout by pressing the outer layer body. The pouring cap for a double container includes: A cap body that is attached to the outer layer body covering the vent, has the spout, and has an outside air inlet communicating with the vent; An inner stopper provided inside the cap body and having a communication port for the content liquid that communicates the filling space and the spout; A pouring valve that can open and close the communication port for the content liquid, blocks the flow of the content liquid from the spout toward the filling space, and allows the flow of the content liquid from the filling space toward the spout; An air valve that can abut against and separate from the pouring valve, blocks the flow of air from the vent toward the outside air inlet, and allows the flow of air from the outside air inlet toward the vent; The inner stopper includes a partition wall that closes the filling space and an outer edge wall that extends upward from an outer edge portion of the partition wall; The cap body has a top wall located above the pouring valve and the air valve; The pouring valve includes a first annular wall that surrounds the communication port for the content liquid and is held by the inner stopper, a first valve body that is elastically supported by the first annular wall on the radially inner side of the first annular wall and can open and close the communication port for the content liquid, and a flange portion that extends radially outward from the first annular wall and constantly contacts the lower surface of the top wall; The air valve includes a second annular wall that is located radially outside the flange portion and is held by the inner stopper, and a second valve body that extends radially inward from the second annular wall and can abut against and separate from the lower surface of the flange portion and is thinner than the flange portion. The air valve is made of a material having a smaller flexural modulus than the material constituting the pouring valve; The air valve is held by the inner stopper between the flange portion and the partition wall when the second annular wall fits into the inner circumference of the outer edge wall and the flange portion abuts against the second valve body from above; When air is introduced from the outside air inlet, the second valve body elastically deforms and separates from the flange portion; The lower surface of the flange portion against which the second valve body abuts is located below the upper surface of the second annular wall. The second valve body extends radially inward from the axial center of the second annular wall, and the air valve is a pouring cap for a double container formed symmetrically above and below with reference to the second valve body in a cross-sectional view.

2. A double container composed of the container body and the pouring cap for a double container according to claim 1.

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