JP6840474B2 - Double container - Google Patents

Description

The present invention relates to a double container including an inner layer body that can be reduced in volume and deformable, and an outer layer body in which the inner layer body is arranged inside.

As a container for storing cosmetics such as lotion, shampoo, conditioner or liquid soap, food seasonings, 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 container 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. In addition, 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 the outer layer and the 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.

In the above double container, when the outside air is introduced from the outside air introduction hole provided in the cap, an outside air introduction valve having a thin ring-shaped valve body as in Patent Document 1, for example, is used in the flow path. ing. 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 above-mentioned double container, the pressure inside the inner layer rises due to the change in the atmospheric temperature, and the contents may be unintentionally injected from the injection hole at the same time as the lid is opened. For example, when a double container stored in a refrigerator is placed at room temperature, the air between the outer layer and the inner layer expands due to the temperature rise, and the pressure increases. However, even if the air between the outer layer body and the inner layer body becomes a positive pressure, the outside air introduction valve is not opened, and this expanded air presses the inner layer body because there is no escape place, and the pressure inside the inner layer body rises. As a result, the check valve is opened, and the contents are poured out against the user's will just by opening the lid. This phenomenon is likely to occur when the contents inside the inner layer are used to some extent and the volume of air between the outer layer and the inner layer is increased.

An object of the present invention is to solve such a problem, and an object of the present invention is to propose a double container capable of suppressing unintended injection of contents even with a change in atmospheric temperature. That is.

The present invention is a double container including an inner layer body for accommodating the contents and an 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 attached to the mouth of the outer layer body, and a cap body.
It is located between the injection hole and the inner layer body and blocks communication between the injection hole and the inner layer body, while the pressure inside the inner layer body is increased by the squeeze of the outer layer body or the double container is tilted. A check valve that allows the injection hole and the inner layer to communicate with each other depending on the posture.
With
The outer layer body is provided with an air outlet hole that communicates with the space between the outer layer body and the inner layer body.
The inner peripheral surface of the outer peripheral wall of the cap body is fitted into the fitting portion provided on the outer layer body.
A concave groove is provided on the outer peripheral surface of the fitting portion, and the air outlet hole communicates with the outside through the concave groove .
The double container is characterized in that a convex portion is formed at a position corresponding to the concave groove on the inner peripheral surface of the outer layer body.

Further, it is preferable that the concave groove is provided below the air outlet hole.

Further, the check valve is provided with a tubular wall having a pouring hole side opening at one end and an inner layer side opening at the other end.
It is preferable that a movable valve body that can move in the vertical direction is provided in the tubular wall.

Further, it is preferable that at least one side surface of the concave groove has an acute angle with respect to the bottom surface.

Further, it is preferable that both side surfaces of the concave groove are substantially parallel.

Further, it is preferable that a plurality of the concave grooves are provided adjacent to each other in the circumferential direction.

According to the double container of the present invention, it is possible to suppress unintended injection of contents even with a change in ambient temperature.

It is a front partial sectional view which shows the double container which concerns on one Embodiment of this invention. (A) is an enlarged cross-sectional view of a cap main body portion in FIG. 1, and (b) is a further enlarged cross-sectional view of a fitting portion of an outer layer body in (a). (A) to (d) are diagrams showing an example of deformation of the shape of the concave groove according to the AA cross section of FIG. 2 (b).

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

FIG. 1 is a partial front sectional view showing the configuration of the double container 100 according to the first embodiment of the present invention. The double container 100 is composed of a double container main body 2, a cap main body 10, an inner plug 20, a moving valve body 30, 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 on the upper side (upper side in FIG. 1), and the side where the bottom of the double container body 2 is located is on the lower side (upper side). (Lower side in FIG. 1).

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. Therefore, after the extrusion blow molding, for example, air is pumped from the ventilation hole 4c (air outlet hole) or negative pressure is sucked from the mouth peripheral wall 4a of the outer layer 4 to contract the inner layer 3 as a whole. Is peeled off from the outer layer body 4, then air is blown into the inner layer body 3, and the whole is brought into close contact with the outer layer body 4 again, so that the inner layer body 3 is easily peeled off from the outer layer body 4 when the contents are poured out. I am trying to be. 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), high density polyethylene resin (HDPE) or polypropylene (PP) is used as the material of the outer layer body 4, and high squeeze property can be imparted particularly when LDPE is used. it can. However, the present invention is not limited to this embodiment, 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 3 and the material of the outer layer 4 is used. 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 outer layer 4 and the inner layer 3 need only be configured to be detachable from each other, and each of them does not necessarily have a single-layer structure. That is, one or both of the outer layer 4 and the inner layer 3 may have a multilayer structure. Further, by providing two adhesive bands between the outer layer 4 and the inner layer 3 so as to be substantially along the parting line, the inner layer 3 is ideally reduced in volume and deformed by pouring out the contents, and the inner layer is deformed. The contents in the body 3 can be completely poured out.

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 4 has a cylindrical mouth peripheral wall 4a (mouth portion), a diameter-expanded portion connected to the mouth peripheral wall 4a and expanded downward, and a reconstructable flexibility connected to the enlarged diameter portion. The body portion to be held and the bottom portion that closes the lower end of the body portion are connected. 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 ventilation hole 4c (air outlet hole) for taking in air between the inner layer body 3 and the outer layer surface provided with the ventilation hole 4c in the vertical direction. A groove portion 4d for notching the male screw portion 4b is provided in the groove portion 4d. In the present embodiment, the bottom portion of the outer layer body 4 is closed, and there is no opening that communicates with the space between the outer layer body 4 and the inner layer body 3 other than the ventilation hole 4c.

Next, the cap body 10 constituting the double container 100 will be described with reference to FIGS. 2 (a) and 2 (b). 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, an upper fitting wall 15 is provided concentrically with the outer peripheral wall 11. A fitting protrusion 18 hangs down from the top wall 13 directly below the dispensing cylinder 14. The outer peripheral surface of the fitting projection 18 is fitted to the upper end of the cylindrical portion 22b of the tubular wall 22 described later.

As shown in FIG. 2B, the fitting portion 4f of the outer layer body 4 is in contact with and fitted to the inner peripheral surface of the lower end of the outer peripheral wall 11. A minute seal protrusion 4s protrudes from the outer peripheral surface of the fitting portion 4f, and the seal protrusion 4s fits into the inner peripheral surface of the lower end of the outer peripheral wall 11 to fit the inner peripheral surface of the outer peripheral wall 11. The sealing property with the outer peripheral surface of the joint portion 4f is improved.

On the outer peripheral surface of the fitting portion 4f, recessed grooves 4r are provided at two positions facing each other in the circumferential direction. Further, as described above, a groove portion 4d for cutting out the male screw portion 4b in the vertical direction is provided between the mouth portion peripheral wall 4a and the outer peripheral wall 11 as shown in FIG. 2A, and the groove portion 4d is provided. A ventilation path T leading to the ventilation hole 4c is formed. Therefore, the space between the outer layer body 4 and the inner layer body 3 communicates with the outside through the ventilation holes 4c, the ventilation passage T, and the concave groove 4r.

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.

Further, in the present embodiment, the recessed grooves 4r are provided at two opposite locations in the circumferential direction, but the present invention is not limited to this embodiment, and the recessed grooves 4r may be provided at only one location or at three or more locations. Good. Further, the interval between the concave grooves 4r may be changed as appropriate.

3 (a) to 3 (d) are views showing an example of modification of the cross-sectional shape of the concave groove 4r according to the cross-sectional shape AA of FIG. 2 (b). In FIG. 3A, the concave groove 4r has a bottom surface 4t extending in the circumferential direction and determining the radial range of the concave groove 4r, and a side surface 4u extending in the radial direction and determining the radial range of the concave groove 4r. Have. More specifically, the bottom surface 4t of the concave groove 4r is located at the innermost position (inner peripheral direction) when the concave groove 4r is viewed from the outer peripheral direction (right direction in FIG. 3A) in FIG. 3A. The side surface 4u of the concave groove 4r is a surface extending from both ends in the circumferential direction of the bottom surface 4t in the outer peripheral direction. The concave groove 4r extends in the vertical direction at the fitting portion 4f of the outer layer body 4 as shown in FIG. 2A while maintaining the cross sections shown in FIGS. 3A to 3D. In addition, in FIGS. 3A to 3D, the inner layer body 3 shows the state which was peeled off from the outer layer body 4 before using the double container 100. In the example of FIG. 3A, the side surface 4u is formed so as to form an obtuse angle with respect to the bottom surface 4t. Since this angle becomes a draft when the outer layer body 4 is released from the mold, the double container main body 2 can be more easily molded by extrusion blow molding. As described later, the cross-sectional area of the concave groove 4r is such that the expansion of air between the outer layer 4 and the inner layer 3 due to the change in atmospheric temperature is discharged to the outside, or the outer layer is formed after the contents are poured out. It is set to the minimum size required to introduce the air required for restoration of 4 from the outside.

In the example of FIG. 3A, by providing the concave groove 4r on the outer peripheral surface of the outer layer body 4, the convex portion 4p is formed on the inner peripheral side of the outer layer body 4. As described above, the inner layer 3 separated from the outer layer 4 is restored to the state of being attached to the outer layer 4 again by sending air into the inner layer 3. However, in the region of the convex portion 4p shown in FIG. 3A, the inner layer body 3 does not return to the state of being attached to the outer layer body 4 again. That is, since the convex portion 3p of the inner layer body 3 once peeled from the outer layer body 4 abuts on the side surface 4ui of the convex portion 4p in FIG. 3A, the frictional force acting between the inner layer body 3 and the side surface 4ui or the like The inner layer 3 does not return to the state of being attached to the outer layer 4. Therefore, since the inner layer 3 is maintained in a state of being separated from the outer layer 4 at least in the peripheral region of the convex portion 4p, an air ventilation space is secured between the outer layer 4 and the inner layer 3. Further, the concave groove 4r is arranged below the ventilation hole 4c as an air discharge hole in FIG. 2A, and is arranged at a position connecting the ventilation hole 4c and the body portion of the double container main body 2. Therefore, when the internal pressure rises due to the change in the atmospheric temperature, the air between the outer layer 4 and the inner layer 3 in the body of the double container body 2 is surely passed through the region of the convex portion 4p, and is passed through the ventilation hole 4c. It can be discharged to the outside. Further, when the outer layer 4 is restored to its original shape after the contents are poured out, the air introduced from the ventilation holes 4c is surely passed through the region of the convex portion 4p, and the body of the double container main body 2 is restored. It can be supplied to the space between the outer layer body 4 and the inner layer body 3 in the portion.

In the modified example of FIG. 3B, the side surfaces 4u on both sides are configured to form an acute angle with respect to the bottom surface 4t of the concave groove 4r. Therefore, the angle formed by the side surface 4ui of the convex portion 4p with the top surface 4ti is also an acute angle. As a result, the circumferential width of the convex portion 4p of the outer layer 4 on the inner peripheral side is larger than the circumferential width of the convex portion 3p of the inner layer 3 separated from the convex portion 4p on the outer peripheral side. When peeled from the outer layer body 4, the outer peripheral end of the convex portion 3p of the inner layer body 3 comes into contact with the inner peripheral end of the convex portion 4p of the outer layer body 4. Therefore, as compared with the example of FIG. 3A, the adhesion between the inner layer body 3 and the outer layer body 4 can be suppressed more reliably. Further, the volume of the space between the outer layer body 4 and the inner layer body 3 can be increased as compared with the example of FIG. 3A. Therefore, when the internal pressure rises due to the change in the atmospheric temperature, the air between the outer layer 4 and the inner layer 3 in the body of the double container body 2 is more reliably passed through the region of the convex portion 4p, and the ventilation hole 4c Can be discharged to the outside. Further, when the outer layer 4 is restored to its original shape after the contents are poured out, the air introduced from the ventilation holes 4c is surely passed through the region of the convex portion 4p, and the body of the double container main body 2 is restored. It can be supplied to the space between the outer layer body 4 and the inner layer body 3 in the portion.

In the modified example of FIG. 3C, only one side surface 4u has an acute angle with respect to the bottom surface 4t of the concave groove 4r. Further, the other side surface 4u is provided so as to be substantially parallel to one side surface 4u. Therefore, on the side surface 4ui of the convex portion 4p corresponding to the side surface 4u that forms an acute angle with the bottom surface 4t in the concave groove 4r, the outer layer body 4 and the inner layer body 3 are surely separated as in the modified example of FIG. 3 (b). Can be maintained in the same state. Further, since the two side surfaces 4u of the concave groove 4r are configured to be substantially parallel to each other, the outer layer body 4 can be released from the mold without being forcibly removed.

In the modified example of FIG. 3D, two concave grooves 4r are provided adjacent to each other in the circumferential direction. In this case, "providing adjacent to each other" means that the recessed grooves 4r are arranged at intervals of substantially the same as the circumferential width of the groove 4r. Each concave groove 4r is configured such that the outer side surface 4u in the circumferential direction forms an acute angle with the bottom surface 4t. Convex portions 4p corresponding to the two concave grooves 4r are formed on the inner peripheral side of the outer layer body 4, and in the example of FIG. 3D, as one convex portion 4p having a small depression in the center of the top surface 4ti. It is formed. Since the side surface 4u on the outer side in the circumferential direction of each concave groove 4r is configured to form an acute angle with the bottom surface 4t, the angle formed by the side surface 4ui of the convex portion 4p with the top surface 4ti is also an acute angle. Therefore, as in the example of FIG. 3B, the circumferential width of the convex portion 4p of the outer layer body 4 on the inner peripheral side is the circumferential width of the convex portion 3p of the inner layer 3 separated from the outer layer 4 on the outer peripheral side. Once the inner layer 3 is separated from the outer layer 4, the outer peripheral end of the convex portion 3p of the inner layer 3 comes into contact with the inner peripheral end of the convex portion 4p of the outer layer 4. Therefore, as in the example of FIG. 3B, the adhesion between the inner layer body 3 and the outer layer body 4 can be reliably suppressed. Further, since the width of the convex portion 4p in the circumferential direction is larger than that of the example of FIG. 3B, the volume of the space between the outer layer body 4 and the inner layer body 3 can be further increased. Therefore, when the internal pressure rises due to the change in the atmospheric temperature, the air between the outer layer 4 and the inner layer 3 in the body of the double container body 2 is more reliably passed through the region of the convex portion 4p, and the ventilation hole 4c Can be discharged to the outside. Further, when the outer layer 4 is restored to its original shape after the contents are poured out, the air introduced from the ventilation holes 4c is surely passed through the region of the convex portion 4p, and the body of the double container main body 2 is restored. It can be supplied to the space between the outer layer body 4 and the inner layer body 3 in the portion.

The cross-sectional shape of the concave groove 4r is not limited to the above-mentioned one, and any other shape capable of discharging air between the outer layer body 4 and the inner layer body 3 little by little can be used. Further, the concave groove 4r does not necessarily have to maintain the same cross-sectional shape in the vertical direction, and may be configured to be wider downward, for example.

As shown in FIG. 2A, an inner plug 20 is provided on the inner peripheral side of 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 side of the injection hole 14a that opens on the side of the injection hole 14a at one end and an opening on the side of the inner layer 3 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. 2A, the tubular wall 22 of the present embodiment is provided with a through hole 22a at the upper end portion, a cylindrical portion 22b extends from the through hole 22a toward the accommodation space S, and an inclined portion is provided. It is a cylindrical portion having a through hole 22d at the lower end via 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 step portion 23 that bends toward the injection hole 14a on the radial outer side of the tubular wall 22, and hangs down from the top wall 13 of the cap body 10 on the inner peripheral side of the step portion 23. The upper fitting wall 15 is fitted. 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. 2A, a peripheral wall 29 is provided on the outer edge of the partition wall 21, and the upper end portion of the peripheral wall 29 is in contact with the lower surface of the top wall 13 of the cap body 10.

Inside the tubular wall 22, a moving valve body 30 which is spherical in the present embodiment is provided. Ribs 22e are intermittently provided in the circumferential direction between the tubular wall 22 and the moving valve body 30. The rib 22e allows the moving valve body 30 to move up and down in response to a change in the posture of the double container body 2, and when the moving valve body 30 is not in contact with the inclined portion 22c, the content is between the ribs 22e. It is configured to be passable. Further, the upper end of the rib 22e is slightly reduced in diameter in the inner peripheral direction so that the moving valve body 30 once pushed into the tubular wall 22 from above does not separate upward again. 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. As a result, the mobile valve body 30 can seal the accommodation space S. That is, the moving valve body 30 and the tubular wall 22 form a check valve that ejects the contents from the injection hole 14a and suppresses the inflow of air from the injection hole 14a.

In the present embodiment, the mobile valve body 30 is configured as a spherical valve body, but the present invention is not limited to this embodiment. The mobile valve body 30 can have any shape that can move within the tubular wall 22. Further, the shape of the tubular wall 22 may have a shape other than a cylinder as long as the moving valve body 30 can be moved and the contents can be passed therethrough.

Further, in the present embodiment, the check valve is composed of the moving valve body 30 and the tubular wall 22, but the present invention is not limited to this embodiment, and for example, a circular thin-walled valve body is supported by three elastic arms at three points. A valve may be adopted.

As shown in FIG. 2A, the lid 50 is connected to the outer peripheral wall 11 of the cap body 10 via a hinge 51, and can be bent by the hinge 51 to cover the injection hole 14a. .. 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 pouring cylinder 14 when the lid 50 is closed and seals the pouring hole 14a. Further, 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 and the lid body. The 50 can be lifted upward to open it, or pushed downward to close it. When the lid 50 is closed, the peripheral wall step 53a provided on the inner peripheral surface of the lid peripheral wall 53 undercuts and engages with the top wall step 13a, and the lid 50 is the cap body. Engage tightly with respect to 10. Further, the pressing portion 56 hangs downward from the center of the upper wall 52. Even if the moving valve body 30 is attached to the upper end of the rib 22e, when the lid 50 is closed, the pressing portion 56 presses the moving valve body 30 downward to release it from the attached state. 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 100 configured as described above, the lid 50 is opened from the state shown in FIG. 2A, and the double container body 2 is changed from the standing posture to the tilted posture. , Press (squeeze) the body of the outer layer body 4. 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. As described above, since the concave groove 4r is a minute hole, when the body of the outer layer body 4 is pressed, only a small amount of air passes through the ventilation hole 4c, the ventilation passage T, and the concave groove 4r. It is not discharged to the outside. Therefore, even if the outer layer body 4 is pressed, the air leaking from the concave groove 4r among the air between the inner layer body 3 and the outer layer body 4 is small, so that the pressurization to the accommodation space S is hindered. Absent. Since the mobile valve body 30 has already moved to the injection hole 14a side, the contents pass between the ribs 22e and flow out from the through hole 22a, and are further discharged to the outside from the injection hole 14a.

After pouring out the required amount of contents, the double container main body 2 is returned from the tilted posture to the standing posture, and the pressure on the body portion of the outer layer body 4 is released. As a result, the mobile valve body 30 comes into contact with the inclined portion 22c again due to its own weight and closes the check valve, so that it is possible to prevent outside air 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 inside of the ventilation passage T also becomes negative pressure through the ventilation hole 4c. By this negative pressure, outside air is gradually introduced through the concave groove 4r. The introduced outside air is supplied to the space between the outer layer body 4 and the inner layer body 3 via the ventilation passage T and the ventilation hole 4c. As a result, the outer layer 4 can be restored while the inner layer 3 is reduced in volume and deformed.

Even after the pouring of the contents is completed, the contents remain in the pouring cylinder 14, but when the double container body 2 is returned to the original standing posture, the moving valve body 30 is used. Moves to the accommodation space S side of the inner layer 3 due to its own weight or the like. As a result, a space is created on the pouring hole 14a side of the tubular wall 22, so that the contents remaining in the pouring cylinder 14 can be moved to the tubular wall 22 side through the through hole 22a. It can be done (suckback function) and can effectively prevent dripping.

Next, the operation when the atmospheric temperature of the double container 100 changes will be described. Here, consider a case where the double container 100 is stored in the refrigerator for a long time in the state of FIG. 2A, then taken out from the refrigerator and placed at room temperature. Since the ambient temperature of the double container 100 rises from the temperature inside the refrigerator to room temperature, the temperature of the air in the space between the outer layer 4 and the inner layer 3 also rises, and the volume expands. However, as described above, the space between the outer layer body 4 and the inner layer body 3 communicates with the outside through the ventilation holes 4c, the ventilation passage T, and the concave groove 4r. Therefore, the expanded portion of the air between the outer layer body 4 and the inner layer body 3 is discharged to the outside through the concave groove 4r. Therefore, even when the double container 100 is taken out of the refrigerator and placed at room temperature, the volume of air between the outer layer 4 and the inner layer 3 hardly changes, so that the inner layer 3 may be compressed. Absent. Further, since the inside of the inner layer body 3 is configured so that air does not flow in due to the action of the check valve, the expansion of the air in the inner layer body 3 due to the temperature rise is slight. Therefore, since the pressure increase in the inner layer 3 due to the increase in the atmospheric temperature is suppressed, it is possible to suppress the injection of the contents not intended by the user.

As described above, according to the present embodiment, in the double container 100 including the inner layer 3 for accommodating the contents and the squeezeable outer layer 4 for accommodating the inner layer 3, the outer layer 4 has the ventilation holes 4c. (Air outlet hole) is provided, and the inner peripheral surface of the outer peripheral wall 11 of the cap body 10 is fitted into the fitting portion 4f provided below the ventilation hole 4c, and the ventilation hole 4c and the outer peripheral surface of the fitting portion 4f are provided. The air between the outer layer body 4 and the inner layer body 3 is gradually discharged to the outside through the concave groove 4r provided in the above. As a result, even if the atmospheric temperature of the double container 100 rises, the volume of air between the outer layer 4 and the inner layer 3 hardly changes, so that it is possible to suppress the injection of the contents unintended by the user. it can.

Further, according to the present embodiment, in the region of the convex portion 4p formed on the inner peripheral side of the outer layer body 4 with the formation of the concave groove 4r, the inner layer body 3 separated from the outer layer body 4 becomes the outer layer body 4 again. An air ventilation space is secured between the outer layer 4 and the inner layer 3 without restoring the adhered state. Further, the concave groove 4r is arranged below the ventilation hole 4c as an air discharge hole, and is arranged at a position connecting the ventilation hole 4c and the body portion of the double container main body 2. Therefore, the air between the outer layer 4 and the inner layer 3 in the body of the double container body 2 can be reliably passed through the region of the convex portion 4p and discharged to the outside from the ventilation hole 4c.

Further, according to the present embodiment, since the movable valve body 30 that can move up and down in the tubular wall 22 is provided as the check valve, the pressure in the inner layer body 3 is multiplied by the area of the through hole 22d. As long as the weight does not exceed the gravity acting on the moving valve body 30, the moving valve body 30 does not move upward and the check valve is not opened. Therefore, since the check valve is difficult to open due to a slight increase in pressure in the inner layer body 3, it is possible to more effectively suppress the pouring of the contents not intended by the user.

Although the present invention has been described with reference to the drawings and examples, it should be noted that those skilled in the art can easily make various modifications and modifications based on the present disclosure. Therefore, it should be noted that these modifications and modifications are included in the scope of the present invention. For example, the functions included in each component can be rearranged so as not to be logically inconsistent, and a plurality of components can be combined or divided into one. It should be understood that these are also included in the scope of the present invention.

According to the present invention, it is possible to provide a double container 100 capable of suppressing unintended injection of contents even when the ambient temperature changes.

2 Double container body 3 Inner layer 3a Upper opening 3p Convex 4 Outer layer 4a Mouth peripheral wall (mouth)
4b Male thread 4c Vent (air outlet hole)
4d groove part 4f fitting part 4p convex part 4r concave groove 4s seal protrusion 4t bottom surface 4ti top surface 4u side surface 4ui side surface 10 cap body 11 outer peripheral wall 12 female thread part 13 top wall 13 top wall step part 14 injection tube 14a Upper fitting wall 18 Fitting protrusion 20 Inner plug 21 Partition 22 Cylindrical wall 22a Through hole 22b Cylindrical part 22c Inclined part 22d Through hole 22e Rib 23 Step part 26 Seal wall 29 Circumferential wall 30 Moving valve body 50 Lid 51 Hinge 52 Above Wall 53 Lid peripheral wall 53a Peripheral wall Step 54 Seal 56 Pressing 58 Grip 100 Double container S Storage space T Ventilation path

Claims (6)

A double container including an inner layer body for accommodating the contents and an 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 attached to the mouth of the outer layer body, and a cap body.
It is located between the injection hole and the inner layer body and blocks communication between the injection hole and the inner layer body, while the pressure inside the inner layer body is increased by the squeeze of the outer layer body or the double container is tilted. A check valve that allows the injection hole and the inner layer to communicate with each other depending on the posture.
With
The outer layer body is provided with an air outlet hole that communicates with the space between the outer layer body and the inner layer body.
The inner peripheral surface of the outer peripheral wall of the cap body is fitted into the fitting portion provided on the outer layer body.
A concave groove is provided on the outer peripheral surface of the fitting portion, and the air outlet hole communicates with the outside through the concave groove .
A double container characterized in that a convex portion is formed at a position corresponding to the concave groove on the inner peripheral surface of the outer layer body. The double container according to claim 1, wherein the concave groove is provided below the air outlet hole. The check valve has a tubular wall having a pouring hole side opening at one end and an inner layer side opening at the other end.
The double container according to claim 1 or 2, wherein a movable valve body that can move in the vertical direction is provided in the tubular wall. The double container according to any one of claims 1 to 3, wherein the concave groove has an acute angle on at least one side surface with respect to the bottom surface. The double container according to claim 4, wherein both side surfaces of the concave groove are substantially parallel. The double container according to any one of claims 1 to 5, wherein a plurality of the concave grooves are provided adjacent to each other in the circumferential direction.

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