JP6762669B2 - Double container cap - Google Patents

Description

In the present invention, the contents attached to the mouth of the outer layer body and housed in the inner layer body are poured out into a double container including the inner layer body that can be reduced in volume and the outer layer body in which the inner layer body is arranged inside. Regarding the cap for the double container to be made.

As a container for storing cosmetics such as lotion, shampoo, conditioner, liquid soap, food seasoning, etc., an inner layer body provided so as to contain such contents and to be deformable in volume, and this inner layer body. There is known a double container having an outer layer body that forms the outer shell of the container while accommodating the inside. In this double container, there are a delamination container (laminated peeling container) formed by laminating an outer layer body and an inner layer body from the beginning, and a type container in which the outer layer body and the inner layer body are individually formed and assembled. The delamination container is made of EBM (Extrusion Blow Molding), in which a laminated parison that has been heated and melted is sandwiched between molds and air is blown into the container to form a laminated container, and an outer layer and an inner layer are separated. There is a biaxially stretched blow molding method in which a laminated container is formed from a preform (container material) formed in a bottomed tubular shape. In such a double container, a cap for a double container is usually provided at the mouth of the outer layer body with a pouring cylinder for pouring out the contents and a check valve for preventing the intrusion of outside air into the inner layer body. Is installed. Then, by pressing the outer layer body, the inner layer body is pressurized through the air between the outer layer body and the inner layer body, thereby opening the valve body of the check valve and pouring out the contents. Further, the outer layer body is provided with a through hole for taking in outside air between the outer layer body and the inner layer body, and when the outer layer body is restored to its original shape after pouring, the outside air is taken in from this through hole and the inner layer body becomes Only the outer layer is restored while the volume is reduced and deformed.

By the way, in the above-mentioned double container cap, when the outside air is introduced from the outside air introduction hole provided in the cap, the outside air is introduced in the flow path having a thin-walled annular valve body as in Patent Document 1, for example. A valve is used. When the outer layer body is pressed to increase the pressure inside the inner layer body and the contents are discharged, the valve body of this outside air introduction valve comes into contact with the inner surface of the injection plug and is maintained in a closed state, and air passes through. Can't. Further, when the outer layer body is restored to its original shape after the contents are poured out, the pressure in the space between the outer layer body and the inner layer body is reduced to a negative pressure, and the outside air introduction valve is opened. As a result, air is introduced into the space between the outer layer body and the inner layer body from the outside air introduction hole, and the outer layer body can be restored to the original shape while maintaining the volume reduction deformation of the inner layer body.

Japanese Unexamined Patent Publication No. 2013-151316

However, in the outside air introduction valve having the above structure, since the valve body is made of a soft material, the valve body may be distorted when the contents are heat-filled. Further, since the valve body has low rigidity and the outer peripheral side is a free end, it is easy to vibrate, and vibration noise may be generated when the outside air is introduced.

An object of the present invention is to solve such a problem, and an object of the present invention is to propose a cap for a double container capable of stable operation of an outside air introduction valve.

The present invention is a double container cap to be attached to a double container body including an inner layer body for accommodating the contents and a squeeze outer layer body for accommodating the inner layer body.
A cap body having a pouring hole for pouring out the contents from the inner layer body and being attached to the mouth of the outer layer body.
An inner plug having a partition wall located between the injection hole and the inner layer body, and the partition wall having a communication port for passing the contents.
A check valve that closes the communication port while opening the communication port to allow the contents to pass by increasing the pressure inside the inner layer due to the squeeze of the outer layer body.
The outer layer body is provided with an outside air introduction valve which is opened when the outer layer body is restored by releasing the squeeze play and introduces outside air into the space between the outer layer body and the inner layer body through the outside air introduction hole formed in the cap body.
The outside air introduction valve has a thin-walled annular valve body, and the inner peripheral side end portion of the valve body is fixed and the outer peripheral side end portion is seated on the cap body to close the outside air introduction hole. The outer peripheral end is a double container cap characterized in that it is pressed by an elastic force from a direction facing the outside air introduction hole.

Further, a support rod extending in a direction facing the outside air introduction hole is provided at the outer peripheral end of the valve body, and the support rod abuts on the partition wall and is elastically deformed to exert the elastic force. It is preferable to act.

Further, it is preferable that two or more of the support rods are provided at the outer peripheral end of the valve body.

Further, it is preferable that the valve body has a curved shape that is convex toward the inner layer body side.

Further, an annular wall surrounding the communication port is further provided, the check valve is integrally provided on the inner peripheral surface of the annular wall, and the outside air introduction valve is integrally provided on the outer peripheral surface of the annular wall. It is preferable to have.

According to the double container cap of the present invention, stable operation of the outside air introduction valve is possible.

It is sectional drawing which shows the state which attached the cap for the double container which concerns on one Embodiment of this invention to the mouth part of the double container body. (A) is an enlarged cross-sectional view of the outside air introduction valve portion in FIG. 1, and (b) is an arrow view taken along the arrow A of the support rod portion in (a).

Hereinafter, the present invention will be described in more detail with reference to the drawings.

FIG. 1 shows a state in which the double container cap 1 according to the embodiment of the present invention is attached to a double container main body 2 compatible with the double container cap 1. The double container cap 1 is composed of a cap body 10, an inner plug 20, a moving valve body 30, a coupling valve 40, and a lid body 50. Further, the double container main body 2 is composed of an inner layer body 3 and an outer layer body 4. In the present specification, claims, abstract and drawings, the side where the lid 50, which will be described later, is located is the upper side (upper side in FIG. 1), and the side where the double container body 2 is located is the lower side (FIG. 1). (Lower side in).

First, the double container main body 2 will be described. In the present embodiment, the double container main body 2 forms a laminated peeling container by performing extrusion blow molding on a parison formed by laminating the synthetic resin material of the inner layer 3 and the synthetic resin material of the outer layer 4. I'm shaping. Then, ethylene-vinyl alcohol copolymer resin (EVOH) or nylon is used as the material of the inner layer 3 constituting the double container main body 2. Further, low density polyethylene (LDPE) or high density polyethylene resin (HDPE) is used as the material of the outer layer body 4, and high squeeze property can be imparted particularly when LDPE is used. However, the present invention is not limited to this aspect, and when a laminated peeling container is formed by, for example, biaxial stretching blow molding, polypropylene (PP) is used as the material of the inner layer body 3, and polypropylene (PP) is used as the material of the outer layer body 4. Polyethylene terephthalate (PET) may be used. Further, as the material of the inner layer body 3 and the outer layer body 4, other resins having low compatibility with each other can be used. Further, the double container main body 2 may be a container in which the outer layer body 4 and the inner layer body 3 are individually formed and assembled instead of the laminated peeling container. Further, although not shown, one or a plurality of adhesive bands extending vertically to partially join the inner layer 3 and the outer layer 4 between the inner layer 3 and the outer layer 4. May be provided.

The inner layer body 3 is formed so as to be deformable in volume reduction, and in the present embodiment, it is obtained by peeling the double container main body 2 formed in a laminated state from the outer layer body 4. .. The inner layer 3 includes a storage space S for accommodating the contents inside the inner layer body 3 and an upper opening 3a connected to the accommodation space S.

The outer layer body 4 is formed by connecting a cylindrical mouth peripheral wall 4a to a body portion having a recoverable flexibility (not shown) and a bottom portion that closes the lower end of the body portion. A male screw portion 4b is provided on the outer peripheral surface of the mouth peripheral wall 4a. Further, the peripheral wall 4a of the mouth portion is provided with a through hole 4c for taking in air between the inner layer body 3, and further, a male screw portion 4b is provided in the vertical direction on the outer peripheral surface provided with the through hole 4c. A notched groove 4d is provided.

Next, regarding the double container cap 1, the cap body 10 will be described. The cap body 10 is provided with an outer peripheral wall 11 surrounding the mouth peripheral wall 4a, and a female screw portion 12 corresponding to the male screw portion 4b of the mouth peripheral wall 4a is formed on the inner peripheral surface of the outer peripheral wall 11. Further, the top wall 13 is integrally connected to the upper part of the outer peripheral wall 11. A pouring cylinder 14 is provided on the upper surface of the top wall 13, and a pouring hole 14a for pouring out the contents is formed on the inner peripheral surface of the pouring cylinder 14. Further, on the lower surface of the top wall 13, a pair of upper fitting walls 15 having a concentric double arrangement are provided. Further, an outside air introduction hole 16 penetrating the top wall 13 is provided on the outer side in the radial direction from the upper fitting wall 15. In the present embodiment, a step is provided between the central portion and the outer peripheral portion of the top wall 13 (the height of the outer peripheral portion is lower than that of the central portion), and the step is opened outward in the radial direction. The outside air introduction hole 16 is provided. With this configuration, the contents overflowing on the top wall 13 are less likely to enter the outside air introduction hole 16. The lower end of the outer peripheral wall 11 is in airtight contact with the mouth peripheral wall 4a, and a ventilation path T leading to the through hole 4c is provided between the mouth peripheral wall 4a and the outer peripheral wall 11.

In the present embodiment, the groove portion 4d that cuts out the male screw portion 4b in the vertical direction is used as the ventilation passage T, but the present embodiment is not limited to this embodiment. The groove portion 4d may not be provided, and the gap between the male screw portion 4b and the female screw portion 12 may be used as the ventilation path T.

An inner plug 20 is provided inside the cap body 10. The inner plug 20 is located between the injection hole 14a and the inner layer body 3, and includes a partition wall 21 that covers the upper opening 3a of the inner layer body 3.

The partition wall 21 has a tubular shape having an opening on the injection hole 14a side that opens on the injection hole 14a side at one end and an inner layer 3 side opening that opens on the accommodation space S side of the inner layer 3 at the other end. A wall 22 is provided. As shown in FIG. 1, the tubular wall 22 of the present embodiment is provided with a through hole 22a in a part of the partition wall 21, and a cylindrical portion 22b extends from the edge of the through hole 22a toward the accommodation space S. , A cylindrical portion having a through hole 22d at the lower end via the inclined portion 22c. The opening on the injection hole 14a side in the present embodiment corresponds to the through hole 22a, and the opening on the inner layer 3 side corresponds to the through hole 22d. Further, the partition wall 21 is provided with a hole (communication port 23) adjacent to the tubular wall 22 and penetrating the partition wall 21. In the present embodiment, the communication port 23 is provided at one location adjacent to one tubular wall 22, but the number of the communication port 23 and the tubular wall 22 is not limited to this embodiment. Here, the relationship between the total opening area of the inner layer 3 side opening (through hole 22d) in the tubular wall 22 and the total opening area of the communication port 23 is preferably larger than the total opening area of the communication port 23. However, it is not necessarily limited to this. The total opening area means the total of the areas when there are a plurality of openings of the same type.

Further, the partition wall 21 is provided with a step portion 24 that bends to the accommodation space S side radially outside the communication port 23, and a groove that opens upward with the step portion 24 is provided radially outside the step portion 24. A fitting wall 25 to be formed is provided. An annular seal wall 26 that sandwiches the inner layer body 3 with the outer layer body 4 is provided on the lower surface of the partition wall 21. As shown in FIG. 1, at least one groove 27 is provided on the outer edge of the partition wall 21.

Inside the tubular wall 22, a moving valve body 30 which is spherical in the present embodiment is provided. The mobile valve body 30 can move between the tubular wall 22 and the mobile valve body 30 according to the change in the posture of the double container body 2, and the contents hardly pass through (substantially do not pass through). There is a gap. Since the injection hole 14a side of the tubular wall 22 is opened by the through hole 22a and the accommodation space S side is opened by the through hole 22d, the contents that have entered the tubular wall 22 can move through the valve. It does not interfere with the movement of the body 30. Further, the moving valve body 30 has the double container body 2 in an upright posture (a posture in which the bottom of the double container body 2 is placed on a horizontal table), so that the inclined portion 22c of the tubular wall 22 is placed. Sit down. Thereby, the accommodation space S can be sealed.

A check valve 43 is provided between the cap body 10 and the inner plug 20. The check valve 43 is provided inside the cylindrical annular wall 41 in the radial direction as a part of the coupling valve 40. The check valve 43 is a so-called three-point valve having a structure in which three points on the outer peripheral edge of the disc-shaped check valve body 43a are supported by the check valve arm 43b. When the pressure inside the inner layer 3 is increased by the squeeze of the outer layer 4, the check valve body 43a is lifted upward in FIG. 1 against the elastic force of the check valve arm 43b by the pressure, and is lifted from the partition wall 21. By separating the check valves 43, the check valve 43 is opened. When the squeeze of the outer layer body 4 is released, no pressure is applied to the check valve valve body 43a, so that the check valve valve body 43a comes into contact with the partition wall 21 again due to its own weight and the elastic force of the check valve arm 43b, and reverse. The check valve 43 is closed.

In the present embodiment, the check valve valve body 43a is composed of a disk-shaped member, but the present invention is not limited to this embodiment, and a member having a rectangular shape or the like may be used. Further, the check valve 43 does not necessarily have to be a three-point valve, and various valves such as a two-point valve and a thin-walled annular valve that are opened by a positive pressure in the inner layer body 3 can be used.

On the other hand, as shown in FIGS. 1 and 2A, an outside air introduction valve 45 is provided on the outer side of the annular wall 41 in the radial direction. The outside air introduction valve 45 is formed as an annular and thin-walled valve body 45a on the radial outer side of the annular wall 41. The valve body 45a closes the outside air introduction hole 16 by connecting the inner peripheral side end portion to the outer peripheral surface of the annular wall 41 and seating the outer peripheral side end portion on the lower surface of the top wall 13 of the cap body 10. Further, as shown in FIGS. 2A and 2B, the support rods 45b hang down from the outer peripheral end of the valve body 45a at four points in the circumferential direction, and the lower end of the support rods 45b is a partition wall. It is in contact with the upper surface of 21. In this way, by bringing the lower end of the support rod 45b into contact with the partition wall 21, the vibration generated in the valve body 45a when the outside air is introduced is absorbed by the elastic deformation of the support rod 45b, and the noise phenomenon is suppressed. can do. As can be seen from FIG. 2A, the annular valve body 45a is formed in a curved shape that is convex toward the inner layer body 3. Further, the valve body 45a receives an elastic force from below by elastically deforming the support rod 45b in contact with the partition wall 21. By adopting this curved shape and the action of elastic force from below, the valve body 45a can surely contact the top wall 13 until a predetermined negative pressure is applied, and the outside air introduction valve 45 can be maintained in the closed state.

In particular, the valve body 45a is formed of a soft member, and the valve body 45a is easily elastically deformed in the vertical direction by the elastic force received from the support rod 45b. Therefore, the valve body 45a is reliably seated on the lower surface of the top wall 13 by absorbing the shape variation due to the molding of the valve body 45a and the deformation of the valve body 45a due to the heat when the double container body 2 is heat-filled. Can be made to.

On the other hand, the support rod 45b is also integrally formed with the valve body 45a by a soft member. Therefore, when a negative pressure is generated in the space between the outer layer body 4 and the inner layer body 3, the support rod 45b is easily elastically deformed without hindering the downward displacement of the valve body 45a. Therefore, the support rod 45b can smoothly introduce the outside air without hindering the opening operation of the valve body 45a.

In the present embodiment, in consideration of the balance between the effect of suppressing the noise phenomenon and the ease of restoration of the body portion, the support rod 45b is configured to hang down from six locations in the circumferential direction of the valve body 45a. The number of support rods 45b is not limited to this embodiment. For example, even if the support rods 45b are arranged at two locations on the left half of FIG. 1 away from the air introduction holes 16, the effect of suppressing the noise phenomenon can be obtained. The support rods 45b are preferably provided at two or more locations, but are not limited thereto.

Further, in the present embodiment, the check valve 43 and the outside air introduction valve 45 are configured to be integrally provided with the annular wall 41, but the present embodiment is not limited to this embodiment. For example, the check valve 43 may be provided on the first annular wall, and the outside air introduction valve 45 may be provided on the second annular wall so that the two are separately configured. Further, the check valve 43 and the outside air introduction valve 45 may be fixed to something other than the annular wall 41.

In the present embodiment, even when the check valve body 43a is closed, the through hole 22a and the injection hole 14a communicate with each other through the gaps on both sides of the check valve arm 43b in the width direction. As a result, the through hole 22a of the tubular wall 22 is always opened. When the check valve 43 is attached to the cap body 10 and the inner plug 20 as shown in FIG. 1, the lower portion of the annular wall 41 is fitted and held between the step portion 24 and the fitting wall 25, and the check valve 43 is annular. The upper part of the wall 41 is fitted and held by a pair of upper fitting walls 15. As a result, as shown in FIG. 1, an inner space K1 that communicates the communication port 23 and the injection hole 14a to form a flow path for the contents is formed inside the annular wall 41 in the radial direction, and is annular. On the radial outer side of the wall 41, an outer space K2 is formed in which the outside air introduction hole 16 and the groove 27 are communicated with each other to form an air flow path.

As shown in FIG. 1, the lid 50 is connected to the outer peripheral wall 11 of the cap body 10 via a hinge 51, and is bent by the hinge 51 to cover the injection hole 14a and the outside air introduction hole 16. Can be done. More specifically, the lid 50 includes a flat upper wall 52 and a lid peripheral wall 53 that is connected to the edge of the upper wall 52 and is connected to the outer peripheral wall 11. Further, the upper wall 52 is provided with a tubular sealing portion 54 that enters the inside of the dispensing cylinder 14 when the lid 50 is closed and seals the dispensing hole 14a. A grip portion 58 projecting in the outer peripheral direction is provided at the upper end of the lid peripheral wall 53 on the side facing the hinge 51 on the circumference. The user grips the grip portion 58 to hold the lid 50. It can be lifted upwards to open it, or pushed downwards to block it. When the lid 50 is closed, the inner peripheral surface of the lid peripheral wall 53 is undercut engaged with the top wall step portion 13a, and the lid 50 is firmly engaged with the cap body 10. The lid 50 may be separated from the cap body 10 without the hinge 51, and may be attached to the cap body 10 with screws or undercuts.

When discharging the contents from the double container cap 1 configured as described above, the lid 50 is opened from the state shown in FIG. 1, and the double container body 2 is changed from the standing posture to the tilted posture. The body of the outer layer 4 is pressed (squeezed). As a result, the moving valve body 30 in the tubular wall 22 moves to the injection hole 14a side, and the accommodation space S is pressurized through the air between the inner layer body 3 and the outer layer body 4. When the body of the outer layer 4 is pressed, pressure is also applied to the valve body 45a from below through the through hole 4c, the ventilation passage T, and the groove 27, so that the outside air introduction valve 45 is maintained in the closed state. To. Therefore, even if the outer layer body 4 is pressed, the air between the inner layer body 3 and the outer layer body 4 does not leak from the outside air introduction hole 16, and the pressurization to the accommodation space S is not hindered. Then, since the positive pressure in the accommodation space S lifts the check valve valve body 43a, the contents flow out from the communication port 23 and are discharged to the outside from the injection hole 14a via the inner space K1. Here, since the total opening area of the communication port 23 is larger than the total opening area of the opening (through hole 22d) on the inner layer 3 side of the tubular wall 22, when the contents flow, the communication port 23 is used. The resistance is further reduced and the pouring can be done smoothly.

The mobile valve body 30 housed in the tubular wall 22 moves to the injection hole 14a side when the double container body 2 is in an inverted position and the body of the outer layer body 4 is pressed, but the protrusion By contacting the portion 22e, it is prevented from popping out from the tubular wall 22.

After pouring out the required amount of contents, the pressure on the body of the outer layer 4 is released. As a result, the positive pressure in the accommodation space S returns to the outside air pressure, and the check valve valve body 43a closes the communication port 23 again, so that the outside air can be prevented from entering the accommodation space S. Further, since the outer layer body 4 tries to return to the original shape by its own restoring force, the space between the inner layer body 3 and the outer layer body 4 becomes a negative pressure. As a result, the pressure below the outside air introduction valve 45 also becomes negative through the through hole 4c, the ventilation passage T, and the groove 27, so that the valve body 45a is pulled downward against the elastic force from the support rod 45b to introduce the outside air. The valve 45 is in the open state. With the opening of the outside air introduction valve 45, air flows in from the outside air introduction hole 16, passes through the outer space K2, the groove 27, and the ventilation passage T, and is the space between the outer layer 4 and the inner layer 3 through the through hole 4c. Air is introduced into. As a result, the outer layer 4 can be restored while the inner layer 3 is reduced in volume and deformed.

When the check valve body 43a closes the communication port 23, the contents remain in the pouring cylinder 14 and the inner space K1, but when the double container body 2 is returned to the original standing posture. , The moving valve body 30 moves to the accommodation space S side of the inner layer body 3 due to its own weight or the like. As a result, a space is created on the injection hole 14a side of the tubular wall 22, so that the contents remaining in the injection cylinder 14 and the inner space K1 are passed through the through hole 22a to the tubular wall 22 side. It can be moved (suckback function) and can effectively prevent dripping.

As described above, according to the present embodiment, a thin annular valve body is adopted as the valve body 45a of the outside air introduction valve 45, and the outer peripheral side end portion of the valve body 45a is pressed from below by the elastic force. Configured. As a result, the outer peripheral end of the valve body 45a is easily deformed by the elastic force and comes into contact with the top wall 13, so that the shape of the valve body 45a varies due to molding and the inside of the double container body 2 is heat-filled. By absorbing the deformation of the valve body 45a due to the heat, the valve body 45a can be reliably seated on the lower surface of the top wall 13. Further, the vibration generated in the valve body 45a when the outside air is introduced can be absorbed by the elastic deformation of the support rod 45b, and the noise phenomenon can be suppressed.

Further, according to the present embodiment, the support rod 45b is hung from the outer peripheral end portion of the valve body 45a, and the support rod 45b abuts on the partition wall 21 so that the elastic force acts. As a result, the operation of the valve body 45a can be stabilized and the noise phenomenon can be suppressed without increasing the number of parts and the assembly man-hours.

Further, according to the present embodiment, two or more support rods 45b are provided at the outer peripheral end of the valve body 45a of the outside air introduction valve 45. As a result, the outer peripheral end portion of the valve body 45a is supported in a well-balanced manner, and unintended inclination or deformation of the valve body 45a can be suppressed.

Further, according to the present embodiment, the valve body 45a of the outside air introduction valve 45 is configured to have a curved shape that is convex toward the inner layer body 3. As a result, the outside air introduction valve 45 can be maintained in the closed state until a predetermined negative pressure is applied.

Further, according to the present embodiment, since the check valve 43 and the outside air introduction valve 45 are integrally provided with the annular wall 41, the number of parts is reduced and the man-hours for assembling the double container cap 1 are reduced. Can be done.

The double container cap 1 according to the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims. For example, the cross-sectional shape of the moving valve body 30 can be appropriately changed according to the cross-sectional shape of the tubular wall 22. Further, the tubular wall 22 and the moving valve body 30 do not necessarily have to be provided. Further, the outer layer body 4 and the inner layer body 3 are not limited to those formed by blow molding a parison having a laminated structure, and the outer layer body 4 and the inner layer body 3 are individually formed, and then the inner layer body 3 is formed into an outer layer body. It may be installed in 4.

Further, the means for applying an elastic force to the valve body 45a is not limited to the above-mentioned support rod 45b, and for example, a support protrusion extending from the upper surface of the partition wall 21 toward the outer peripheral side end portion of the valve body 45a. May be provided so that the support protrusion abuts on the outer peripheral end portion of the valve body 45a and elastically deforms to exert an elastic force.

According to the present invention, it is possible to provide a new double container cap 1 capable of stable operation of the outside air introduction valve 45.

1 Double container cap 2 Double container body 3 Inner layer 3a Upper opening 4 Outer layer 4a Mouth peripheral wall (mouth)
4b Male thread 4c Through hole 4d Groove 10 Cap body 11 Outer wall 12 Female thread 13 Top wall 13a Top wall step 14 Injection cylinder 14a Injection hole 15 Upper fitting wall 16 Outside air introduction hole 20 Inner plug 21 Partition 22 Cylindrical Wall 22a through hole (opening on the injection hole side)
22b Cylindrical part 22c Inclined part 22d Through hole (opening on the inner layer side)
22e Protrusion 23 Communication port 24 Steps 25 Fitting wall 26 Seal wall 27 Groove 30 Moving valve body 40 Coupling valve 41 Circular wall 43 Check valve 43a Check valve valve body 43b Check valve arm 45 Outside air introduction valve 45a Valve body 45b Support rod 47 Peripheral wall 50 Lid body 51 Hinge 52 Upper wall 53 Lid body peripheral wall 54 Sealed part 58 Grip part K1 Inner space K2 Outer space S Containment space T Ventilation path

Claims (5)

A double container cap to be attached to a double container body including an inner layer body for accommodating the contents and a squeeze outer layer body for accommodating the inner layer body.
A cap body having a pouring hole for pouring out the contents from the inner layer body and being attached to the mouth of the outer layer body.
An inner plug having a partition wall located between the injection hole and the inner layer body, and the partition wall having a communication port for passing the contents.
A check valve that closes the communication port while opening the communication port to allow the contents to pass by increasing the pressure inside the inner layer due to the squeeze of the outer layer body.
The outer layer body is provided with an outside air introduction valve which is opened when the outer layer body is restored by releasing the squeeze play and introduces outside air into the space between the outer layer body and the inner layer body through the outside air introduction hole formed in the cap body.
The outside air introduction valve has a thin-walled annular valve body, and the inner peripheral side end portion of the valve body is fixed and the outer peripheral side end portion is seated on the cap body to close the outside air introduction hole. A double container cap characterized in that the outer peripheral end portion is pressed by an elastic force from a direction facing the outside air introduction hole. A support rod extending in a direction facing the outside air introduction hole is provided at the outer peripheral end portion of the valve body, and the elastic force acts when the support rod abuts on the partition wall and elastically deforms. , The double container cap according to claim 1. The double container cap according to claim 2, wherein two or more of the support rods are provided at the outer peripheral end of the valve body. The double container cap according to any one of claims 1 to 3, wherein the valve body has a curved shape that is convex toward the inner layer body side. An annular wall surrounding the communication port is further provided, the check valve is integrally provided on the inner peripheral surface of the annular wall, and the outside air introduction valve is integrally provided on the outer peripheral surface of the annular wall. The double container cap according to any one of claims 1 to 4.

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