JP2020196454A - Pour-out cap for double container and double container - Google Patents

Abstract

To provide a pour-out cap for double container which can effectively suppress sound caused by the air valve, and a double container.SOLUTION: A pour-out cap for double container comprises an air valve having: a base part 6c which is directly or indirectly supported by at least one of a cap body 8 and an inside plug 5; a valve body part 6d of which one end is connected to the base part 6c, and the other end is movable with respect to the base part 6c, and the other end air-tightly contacts an inner surface of the cap body 8 to block air circulation between a vent hole 3e and an outside air introduction port 8j, and on the other hand, the other end separates from the inner surface of the cap body 8 to allow air circulation between the vent hole 3e and the outside air introduction port 8j when an internal space N becomes a decompressed state; and a projection 6j which projects from the valve body part 6d, and always contacts the cap body 8 and/or the inside plug 5.SELECTED DRAWING: Figure 1

Description

INDUSTRIAL APPLICABILITY The present invention is a double-container pouring cap that is attached to a container body including an inner layer body for accommodating the contents and an outer layer body for accommodating the inner layer body, and ejects the contents as the contents are pressed against the outer layer body. , And a double container with this pouring cap attached to the container body.

In recent years, in a container in which a pouring cap is attached to a container body for accommodating contents, for example, as shown in Patent Document 1, a double container (Delami) using a container body composed of an inner layer body and an outer layer body. Containers (also called laminated peeling containers) are used. This type of outer layer is flexible and has through holes (vents) that penetrate the front and back so that air can be taken into the internal space formed between the inner layer and the inner layer. Has been done. The pouring 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 decompressed.

According to the double container having such a structure, the internal space is pressurized by pressing the outer layer body, whereby the pressure in the filling space is increased and the contents can be poured out. Further, if the pressure on the outer layer body is released, the internal space is decompressed as the outer layer body is restored, so that air is introduced from the vent to the inner space and only the inner layer body can be reduced in volume and deformed. That is, there is an advantage that the independence of the container is maintained even if the content is reduced. Further, since the contents can be poured out without replacing with the outside air, there is an advantage that the quality of the contained contents is less likely to deteriorate. For this reason, this type of container is being widely used as a suitable container for storing seasonings such as soy sauce, sauce, mirin, and cooking liquor, and cosmetics such as shampoo, conditioner, liquid soap, and lotion.

Japanese Unexamined Patent Publication No. 2011-31932.

As shown in Patent Document 1, the above-mentioned injection cap is provided with an air valve inside the cap body attached to the outer layer body. The cap body is provided with an outside air inlet leading to the vent of the outer layer body, and the air valve normally abuts on the back surface of the cap body to allow air to flow between the vent and the outside air inlet. As a result of elastic deformation so as to separate from the back surface of the cap body when the internal space is decompressed, air can flow between the ventilation port and the outside air introduction port.

By the way, depending on the amount of air introduced into the internal space, the flow velocity, etc., the air valve separated from the back surface of the cap body may vibrate and make a noise.

An object of the present invention is to solve such a problem, and a double container pouring cap and a double container capable of effectively suppressing noise caused by an air valve. The purpose is to provide.

The present invention is mounted on a container body provided with an inner layer having a filling space for accommodating the contents and an outer layer having a vent that partitions the inner space between the inner layers and leads to the inner space. , A double container pouring cap for pouring the contents of the filling space from the pouring outlet by pressing the outer layer body.
A cap body that covers the vent and is attached to the outer layer body, has the spout, and has an outside air inlet that leads to the vent.
An inner plug provided inside the cap body and having a communication port for contents that communicates the filling space and the spout.
A base portion that is directly or indirectly supported by at least one of the cap body and the inner plug, and one end portion that is connected to the base portion and the other end portion that is movable with respect to the base portion, and the other end portion. The portion airtightly contacts the inner surface of the cap body to block the flow of air between the ventilation port and the outside air introduction port, while when the internal space becomes decompressed, the other end portion is the cap body. A valve body portion that separates from the inner surface of the air and allows air to flow between the ventilation port and the outside air introduction port, and protrudes from the valve body portion and always abuts on the cap body and / or the inner plug. A double container pouring cap comprising a protrusion and an air valve having.

The protrusion is always in contact with the cap body, and the first contact surface of the cap body with which the protrusion is in contact is in the middle from the one end portion of the valve body portion toward the other end portion. It is preferable to incline toward the stopper.

The protrusion is always in contact with the inner plug, and the second contact surface of the inner plug with which the protrusion is in contact is the cap from the one end portion of the valve body portion toward the other end portion. It is preferable to incline in a direction away from the main body.

It is preferable that the thickness of the protrusion in the direction from one end to the other end is thinner at the tip than at the root.

The valve body portion has a donut plate shape, and it is preferable that a plurality of the protrusions are provided around the central axis of the valve body portion at equal intervals.

The double container of the present invention is composed of the container body and an injection cap for any of the double containers.

In the double container pouring cap of the present invention, the protrusion protruding from the valve body is always in contact with the cap body and / or the inner plug, so that the valve body is separated from the inner surface of the cap body. Vibration is suppressed and noise can be suppressed. In the present specification and the like, the contact includes not only a state in which the two members are in contact but also a state in which the two members are slightly separated from each other.

It is a partially enlarged sectional view which showed one Embodiment of the double container according to this invention. FIG. 1A is an enlarged view of the periphery of the protrusion in FIG. 1, and FIG. 1B is a perspective view of the check valve shown in FIG. It is a figure which enlarged and showed the periphery of the protrusion with respect to the modification of the double container shown in FIG.

Hereinafter, the first embodiment of the double container according to the present invention will be described with reference to FIG. In the present specification and the like, the "up" direction and the "down" direction mean that the outer layer body (reference numeral 3) is located below and the lid body (reference numeral 9) is located above as shown in FIG. The direction in.

The double container of the present embodiment is composed of a container body 1 (composed of an inner layer 2 and an outer layer 3), a pouring cap 4 (inner plug 5, a check valve 6, a moving valve 7, and a cap body 8). ), And a lid 9.

The inner layer 2 is provided with a filling space S inside which the contents can be accommodated. The inner layer 2 of the present embodiment is made of a thin synthetic resin and is provided so as to be deformable in volume reduction.

The outer layer body 3 includes a tubular mouth portion 3a extending along the central axis O. In the mouth portion 3a of the present embodiment, the lower portion 3c is formed to have a larger diameter than the upper portion 3b whose upper end opens. Further, 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 vent 3e extending in the radial direction and penetrating the upper portion 3b, and a male screw portion 3d extending in the vertical direction is provided on the outer peripheral surface where the vent 3e opens. A notch 3f for dividing is provided. Although not shown, a tubular body portion and a bottom portion for 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 shape. Further, the outer layer body 3 of the present embodiment is made of synthetic resin, and the body portion has flexibility.

Further, an internal space N leading to the vent 3e is formed between the inner layer 2 and the outer layer 3.

The inner layer body 2 and the outer layer body 3 in the present embodiment are formed by laminating synthetic resins having low compatibility with each other so as to be peelable. Examples of the synthetic resin constituting the inner layer 2 include nylon resin (PA), ethylene vinyl alcohol copolymer resin (EVOH), modified polyolefin resin (for example, "Admer" (registered trademark) manufactured by Mitsui Chemicals, Inc.), polyethylene terephthalate, etc. In addition to the resin (PET), a polyethylene resin (PE) or a polypropylene resin (PP) can be used. Examples of the synthetic resin constituting the outer layer 3 include polyethylene resin (PE) such as low density polyethylene (LDPE) and high density polyethylene resin (HDPE), polypropylene resin (PP), and polyethylene terephthalate resin (PET). ) Can be adopted. The inner layer 2 and the outer layer 3 may be formed by a single synthetic resin so as to have a single layer structure, or a plurality of synthetic resins are laminated to form a laminated structure. It may be done. Such an inner layer body 2 and an outer layer body 3 can be obtained by blow molding a parison in which a synthetic resin material forming the inner layer body 2 and a synthetic resin material forming the outer layer body 3 are laminated. In addition, a test tubular 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 stretched blow molding, or the inner layer is formed. It is also possible to use a body in which the body and the outer layer are individually formed, and then the inner layer is arranged inside the outer layer. Further, 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 between the inner layer 2 and the outer layer 3. May be provided.

The inner plug 5 includes a partition wall 5a located above the mouth portion 3a and closing the filling space S. The partition wall 5a is provided with an opening (communication port 5b for contents) penetrating the partition wall 5a, and a tubular wall 5c having a cylindrical shape as a whole and having a lower diameter reduced with respect to the upper part.

Further, an annular recess 5e having an open upper portion is provided on the radial outer side of the content communication port 5b and the tubular wall 5c, and an inner layer body is provided on the lower surface of the partition wall 5a on the radial outer side of the annular recess 5e. An annular seal wall 5d that is in close contact with 2 is provided. Further, the outer edge portion of the partition wall 5a is provided with an outer edge wall 5f extending upward, and the connecting portion between the partition wall 5a and the outer edge wall 5f is provided with a communication opening 5g penetrating them. There is. The inner plug 5 of the present embodiment is made of a synthetic resin such as polypropylene (PP).

The check valve 6 has an air valve 6a for regulating the flow of air and an injection valve 6b for regulating the flow of contents. The check valve 6 of the present embodiment is made of a soft material such as rubber, an elastomer, or soft polyethylene (low density polyethylene).

The air valve 6a has a tubular shape centered on the central axis O, and has a base portion 6c whose lower end is supported by an annular recess 5e. Further, on the radial outer side of the base portion 6c, there is a thin donut plate shape centered on the central axis O, and as shown in FIG. 1, the inner edge portion is integrally connected to the base portion 6c and fixedly supported by the base portion 6c. A valve body portion 6d is provided, which extends from there so as to be curved downward in the radial direction and has a bulging outer edge portion to be thicker than the inner edge portion. Such a valve body portion 6d can be elastically deformed so that its outer edge portion moves up and down.

Further, on the upper surface of the valve body portion 6d, a protrusion 6e that is integrally connected to the valve body portion 6d and extends upward is provided. As shown in FIGS. 2A and 2B, the protrusion 6e of the present embodiment has a relatively thin rod shape and is formed so as to form a substantially triangular shape in a plan view (arrow view B in FIG. 2A). It has been. Further, the tip portion of the protrusion 6e is provided with an inclined portion 6f on the side opposite to the side facing the base portion 6c. That is, the thickness of the tip portion of the protrusion 6e (the thickness of the valve body portion 6d in the direction from the inner edge portion to the outer edge portion) is thinner than that of the root portion of the protrusion 6e. Further, as shown in FIG. 2B, a total of eight protrusions 6e of the present embodiment are provided at equal intervals in the circumferential direction about the central axis O.

The discharge valve 6b is located above the content communication port 5b and the tubular wall 5c, and sits on the partition wall 5a to close the content communication port 5b while opening a part of the tubular wall 5c. It is provided with a plate-shaped dispense valve main body 6 g to be left as it is, and a connecting piece 6h elastically connecting the dispense valve main body 6 g and the base portion 6c. The dispensing valve 6b is not limited to connecting the dispensing valve main body 6g and the base 6c with a plurality of connecting pieces 6h such as a 3-point valve or a 4-point valve, but one connecting piece such as a 1-point valve. The dispense valve main body 6 g and the base portion 6c may be connected by 6h.

The moving valve 7 is arranged in the tubular wall 5c, and is provided so as to move along the inner peripheral surface of the tubular wall 5c in response to a change in the posture of the container body 1 and the internal pressure of the filling space S. .. As shown in FIG. 1, the moving valve 7 sits on the reduced diameter lower part of the tubular wall 5c when the container body 1 is in the upright posture, and does not communicate between the tubular wall 5c and the filling space S. It is in a state.

The cap body 8 is made of synthetic resin in the present embodiment, and is integrally connected to the top wall 8a located above the check valve 6 and the outer edge of the top wall 8a, and the outer peripheral wall 8b surrounding the mouth portion 3a. And have. On the inner peripheral surface of the outer peripheral wall 8b, a female screw portion 8c suitable for the male screw portion 3d is provided.

At the central portion of the top wall 8a, a pouring cylinder 8e is provided which extends upward from the edge of the hole penetrating the top wall 8a and whose upper opening is the pouring port 8d of the contents. Further, the lower surface of the top wall 8a is provided with an annular recess 8f that opens downward and supports the upper end portion of the base portion 6c. Further, on the lower surface of the top wall 8a, the portion located directly above the protrusion 6e has a surface (on the inner plug 5) that inclines downward toward the outer side in the radial direction (from the inner edge portion to the outer edge portion in the valve body portion 6d). A first contact surface 8g, which is a surface inclined in the approaching direction), is provided, and a step portion 8h whose lower surface extends in the horizontal direction is provided at a portion located directly above the outer edge portion of the valve body portion 6d. There is.

Further, the top wall 8a is provided with an outside air introduction port 8j penetrating the front and back surfaces thereof. As shown in FIG. 1, the outside air introduction port 8j is provided at a position overlapping the first contact surface 8g in the radial direction, but is displaced in the circumferential direction with respect to the position where the protrusion 6e is provided. All the tips of the protrusions 6e are in contact with the first contact surface 8g. A claw portion 8k for holding the lid 9 is provided on the outer edge portion of the top wall 8a.

The lid 9 is made of synthetic resin in the present embodiment, and includes a top wall 9a located above the top wall 8a and a lid outer peripheral wall 9b integrally connected to the top wall 9a.

On the lower surface of the top wall 9a, a seal cylinder 9c that is inserted inside the dispensing cylinder 8e and that is in airtight contact with the inner surface of the dispensing cylinder 8e is provided.

An engaging recess 9d that engages with the claw portion 8k is provided on the inner peripheral surface of the outer peripheral wall 9b of the lid. Further, on the outer peripheral surface of the outer peripheral wall 9b of the lid, a hinge portion 9e that is integrally connected to the outer peripheral wall 8b of the cap body 8 is provided. Although the lid 9 of the present embodiment is integrally connected to the cap body 8, it may be provided separately from the cap body 8 and detachably attached to the cap body 8 by screws or undercuts. Good.

When such an inner plug 5, a check valve 6, a moving valve 7, and a cap body 8 are attached to the outer layer body 3, the state as shown in FIG. 1 is normally obtained. In this state, as shown by the solid line in FIG. 2A, the outer edge portion of the valve body portion 6d is in airtight contact with the lower surface of the step portion 8h. The tip of the protrusion 6e comes into contact with the first contact surface 8g. In the present embodiment, the protrusion 6e is brought into contact with the first contact surface 8g so as to be slightly bent. Here, since the protrusion 6e has a relatively thin rod shape and the protrusion 6e is made of the same soft material as the valve body portion 6d, even when the protrusion 6e is in contact with the first contact surface 8g, A force that causes the outer edge portion of the valve body portion 6d to separate from the lower surface of the step portion 8h does not act. In the present embodiment, the thickness of the tip portion of the protrusion 6e is thinner than that of the root portion due to the inclined portion 6f, which makes it easier to bend. Therefore, an excessive pushing force is prevented from acting on the valve body portion 6d. ing. When the valve body portion 6d is positioned higher than expected due to variations during assembly, for example, the outer edge portion of the valve body portion 6d is pushed harder than expected with respect to the lower surface of the step portion 8h. Although it will hit, the effect that the valve body portion 6d can be corrected to an appropriate position by the protrusion 6e can also be obtained.

Further, as will be described later, when the internal space N is in a decompressed state, the valve body portion 6d is elastically deformed so that the outer edge portion is lowered starting from the inner edge portion as shown by a virtual line in FIG. 2 (a). .. In this state, a passage (communication passage) through which air that communicates from the outside air introduction port 8j to the ventilation port 3e is formed inside the cap body 8. The communication passage of the present embodiment passes through the gap between the outer edge portion of the valve body portion 6d separated from the outside air introduction port 8j and the step portion 8h, passes through the communication opening 5g, and further connects the male screw portion 3d and the female screw portion 8c. It is a passage leading to the vent 3e through a spiral gap (or a gap formed by the notch 3f) formed between them. By the way, even in a state where the valve body portion 6d is elastically deformed so that the outer edge portion is lowered starting from the inner edge portion, the first contact surface 8g is inclined toward the inner plug 5 in the radial direction. , The tip of the protrusion 6e comes into contact with the first contact surface 8g.

In the double container having such a configuration, the internal space N is pressurized by pressing the body portion of the outer layer body 3, and the pressure of the filling space S is increased by this, so that the contents of the filling space S are While raising the pouring valve body 6g, it flows from the content communication port 5b through the gap around the connecting piece 6h to the inside of the base 6c, and is poured out from the pouring port 8d through the inside of the pouring cylinder 8e. Is done. Here, in the above-mentioned communication passage connecting the ventilation port 3e and the outside air introduction port 8j, the outer edge portion of the valve body portion 6d is in airtight contact with the step portion 8h and is in a non-communication state. Air does not leak to the outside world. The moving valve 7 in the tubular wall 5c depends on its own weight or the contents flowing in from the opening on the lower side of the tubular wall 5c in a state where the container body 1 is displaced to the tilted posture in order to eject the contents. , It has moved to the 6g side of the discharge valve body (the position shown by the broken line in FIG. 1).

After that, when the pressure on the outer layer body 3 is released and the body portion begins to be restored, the volume of the internal space N increases, so that the internal space N is in a decompressed state. As a result, the valve body portion 6d is elastically deformed as shown by a virtual line in FIG. 2A, and the outer edge portion thereof is separated from the step portion 8h. Therefore, the air introduced from the outside air introduction port 8j is a series described above. It is introduced into the internal space N through the passage. As a result, the outer layer 3 can be restored while the inner layer 2 is reduced in volume and deformed. Further, in this state, the tip portion of the protrusion 6e is in contact with the first contact surface 8g, and the vibration of the valve body portion 6d is suppressed, so that the noise can be effectively suppressed. The protrusions 6e in the present embodiment are provided at equal intervals in the circumferential direction with respect to the valve body portion 6d, and the vibration of the valve body portion 6d can be suppressed evenly in the circumferential direction, so that the sound is more effectively produced. Can be suppressed.

Further, when the pressure on the outer layer body 3 is released, the pressure in the filling space S returns to the original state and the discharge valve main body 6g is seated on the upper surface of the partition wall 5a, so that the filling space S from the content communication port 5b It is possible to prevent the inflow of outside air into the air. Here, when the container body 1 is displaced to the original upright posture after the pouring of the contents is completed, the moving valve 7 moves downward due to its own weight and the pressure drop in the filling space S. As a result, a space corresponding to the movement of the moving valve 7 is formed on the upper inside of the tubular wall 5c. Therefore, the content liquid corresponding to this space is poured from the cylinder 8e to the tubular wall 5c. It can be pulled back inward (suckback function), and dripping can be effectively prevented from the pouring cylinder 8e. Since the moving valve 7 that has moved downward is seated on the reduced diameter lower portion of the tubular wall 5c, it is possible to prevent outside air from flowing from the tubular wall 5c into the filling space S.

The double container of the present invention can also be embodied in the form shown in FIGS. 3 (a) and 3 (b). Here, in the embodiment of FIG. 3A, the protrusion 6e extending upward from the upper surface of the valve body portion 6d described above is replaced with the protrusion 6e extending downward from the lower surface of the valve body portion 6d. The protrusion 6j is provided. The tip of the protrusion 6j is also provided with an inclined portion 6k having the same shape as the inclined portion 6f described above. Further, on the upper surface of the partition wall 5a of the inner plug 5, a surface (cap) that inclines downward in the radial direction (from the inner edge portion to the outer edge portion in the valve body portion 6d) at a portion located directly below the protrusion 6j. A second contact surface 5h, which is a surface (a surface that inclines in a direction approaching the top wall 8a of the main body 8), is provided.

Even in such a double container, as shown by the solid line and the virtual line in FIG. 3A, the tip portion of the protrusion 6j always abuts on the second contact surface 5h. Therefore, even when the internal space N is in a decompressed state and the outer edge portion of the valve body portion 6d is separated from the step portion 8h, the vibration of the valve body portion 6d is suppressed and the noise can be effectively suppressed. ..

By the way, in recent years, for example, in consideration of recyclability, the adoption of polyethylene terephthalate resin (PET) as a material for the inner layer body 2 and the outer layer body 3 has been studied. This material has a higher flexural modulus than low-density polyethylene (LDPE), which is often used in double containers, and has higher rigidity when used for the outer layer body 3. Therefore, when the pressure on the outer layer body 3 is released, the body portion Restores rapidly. That is, when the outer layer body 3 is restored, the flow velocity of the air introduced into the internal space N tends to increase, so that the vibration of the valve body portion 6d tends to increase. In such a case, as shown in FIG. 3B, it is preferable to use a protrusion 6m having an inclined portion 6n at the tip portion. The tip of the protrusion 6m always comes into contact with the second contact surface 5h like the protrusion 6j shown in FIG. 3A, but the protrusion 6j is in the width direction (valve body portion 6d) as compared with the protrusion 6j. The rigidity of the protrusion 6j is increased by increasing the length in the circumferential direction). By using the protrusion 6m having high rigidity in this way, it is possible to effectively suppress the noise even when the vibration of the valve body portion 6d becomes large. If the vibration of the valve body portion 6d becomes large, the lengths of the protrusions 6e, 6j, etc. may be increased, or the thickness (thickness of the valve body portion 6d in the direction from the inner edge portion to the outer edge portion) may be increased. However, it is possible to suppress the noise.

Although the dispensing cap for a double container and the double container according to the present invention have been described above with reference to specific embodiments, the present invention is not limited to such embodiments. For example, the protrusions 6e, 6j and the like are not limited to those provided only on the upper surface or the lower surface of the valve body portion 6d, and may be provided on both the upper surface and the lower surface of the valve body portion 6d. Further, the number of protrusions 6e, 6j and the like may be appropriately selected. The base portion 6c to which the valve body portion 6d is connected is not limited to the one supported by both the inner plug 5 and the cap body 8, and may be supported by either one. Further, the base portion 6c may be supported by the inner plug 5 or the cap body 8 via, for example, another member. The air valve 6a and the discharge valve 6b are composed of one member (check valve 6) in the above-described embodiment, but may be composed of two or more members.

1: Container body 2: Inner layer 3: Outer layer 3a: Mouth 3b: Upper part 3c: Lower part 3d: Male thread 3e: Vent 3f: Notch 4: Dispensing cap 5: Inner plug 5a: Partition 5b: Communication port for contents 5c: Cylindrical wall 5d: Seal wall 5e: Circular recess 5f: Outer edge wall 5g: Communication opening 5h: Second contact surface 6: Check valve 6a: Air valve 6b: Outlet valve 6c: Base 6d: Valve body 6e: Protrusion 6f: Inclined portion 6g: Dispensing valve body 6h: Connecting piece 6j: Protrusion 6k: Inclined portion 6m: Protrusion 6n: Inclined portion 7: Moving valve 8: Cap body 8a: Top wall 8b: Outer wall 8c: Female threaded portion 8d: Outlet 8e: Outlet cylinder 8f: Circular recess 8g: First contact surface 8h: Stepped portion 8j: Outside air introduction port 8k: Claw portion 9: Lid body 9a: Top wall 9b: Lid Body outer wall 9c: Seal cylinder 9d: Engagement recess 9e: Hinge N: Internal space S: Filling space

Claims (6)

The outer layer body is attached to a container body having an inner layer body having a filling space for accommodating the contents and an outer layer body having a vent for partitioning the inner layer space between the inner layer body and the inner layer body. A double container pouring cap that pours out the contents of the filling space from the pouring outlet by pressing.
A cap body that covers the vent and is attached to the outer layer body, has the spout, and has an outside air inlet that leads to the vent.
An inner plug provided inside the cap body and having a communication port for contents that communicates the filling space and the spout.
A base portion that is directly or indirectly supported by at least one of the cap body and the inner plug, and one end portion that is connected to the base portion and the other end portion that is movable with respect to the base portion, and the other end portion. The portion airtightly contacts the inner surface of the cap body to block the flow of air between the ventilation port and the outside air introduction port, while when the internal space becomes decompressed, the other end portion is the cap body. A valve body portion that separates from the inner surface of the air and allows air to flow between the ventilation port and the outside air introduction port, and protrudes from the valve body portion and always abuts on the cap body and / or the inner plug. A double container pouring cap comprising a protrusion and an air valve having. The protrusion is always in contact with the cap body, and the first contact surface of the cap body with which the protrusion is in contact is in the middle from the one end portion of the valve body portion toward the other end portion. The dispensing cap for a double container according to claim 1, which is inclined in a direction approaching the stopper. The protrusion is always in contact with the inner plug, and the second contact surface of the inner plug with which the protrusion is in contact is the cap from the one end portion of the valve body portion toward the other end portion. The double container dispensing cap according to claim 1 or 2, which is inclined away from the main body. The double container pouring cap according to any one of claims 1 to 3, wherein the protrusion has a thickness in the direction from one end toward the other end thinner than that of the root. The double according to any one of claims 1 to 4, wherein the valve body portion has a donut plate shape, and a plurality of protrusions are provided around the central axis of the valve body portion at equal intervals. Dispensing cap for containers. A double container composed of the container body and the dispensing cap for the double container according to any one of claims 1 to 5.

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