Discharge cap

Abstract

To appropriately collect the remaining content.SOLUTION: There is provided a discharge cap 5 comprising: a cap body 40 whose discharge hole 41 is formed, that is attached to a mouth of a double container body 4 comprising an inner container 2 and an outer container 3; an inner plug 10 provided with a communication cylindrical part 20 where a closure wall part 11 for closing the mouth of the double container body and a communication hole 21 communicating to the inside of the inner container are formed; a closure member 50 switching communication / shut-off between the discharge hole and the inside of the communication cylindrical part; and a valve member 30 stored inside the communication cylindrical part in a freely moving manner. The valve member closes the communication hole, and opens the communication hole when moving to the discharge hole side from the communication hole side. The closure member comprises a closure body 51 for closing the inside of the communication cylindrical part in an openable manner by separably coming into contact with the closure wall part. A circulation groove 65 communicating the discharge hole with the inside of the communication cylindrical part is formed between the closure wall part and the closure body.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a dispensing cap for a dual container. [Background technology]

[0002] A double container is known which comprises an inner container that is filled with contents and undergoes a volumetric deformation as the contents decrease, a container body which comprises an outer container in which the inner container is fitted, and a discharge cap which is attached to the mouth of the container body (see, for example, Patent Document 1). The discharge cap includes a cap body having a discharge hole for discharging the contents and attached to the mouth of the container body, an inner plug portion having a circulation hole for circulating the contents, and a discharge valve for switching between communication between the inside of the discharge hole and the inside of the container body (inside the inner container) through the circulation hole and blocking the communication. Furthermore, the inner plug portion is formed with a storage tube portion for recovering the contents, which communicates between the inside of the discharge hole and the inside of the inner container and has a ball valve disposed therein.

[0003] According to this double container, for example, the container body is tilted or turned upside down, and then the container body is squeezed or deformed to increase the internal pressure of the inner container. This allows the discharge valve to be opened, and the contents in the inner container can be discharged to the outside through the circulation hole and the discharge hole. Then, the increase in the internal pressure of the inner container stops or decreases, and the discharge valve can be closed, blocking communication between the discharge hole and the inner container through the circulation hole. This allows the discharge of the contents to be stopped. Furthermore, by returning the container body to an upright position, the ball valve can be moved within the cylindrical storage portion, and the suck-back effect that accompanies the movement of the ball valve makes it possible to draw the remaining contents into the cylindrical storage portion and recover them. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-172372 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the above-mentioned conventional double container, since the tubular storage portion is provided separately from the flow hole, there is a possibility that the contents cannot be appropriately recovered into the tubular storage portion.

[0006] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a discharge cap that is capable of appropriately recovering the remaining contents. [Means for solving the problem]

[0007] (1) The discharge cap according to the present invention is a discharge cap to be attached to the mouth of a double-container body having an inner container which is filled with contents and which undergoes volume-reducing deformation as the contents decrease, and an outer container in which the inner container is fitted, the discharge cap comprising: a cap body which is attached to the mouth of the double-container body and which has a discharge hole for the contents; an inner plug part which has a closing wall part which closes the mouth of the double-container body, and a communicating tube part which extends downward from the closing wall part and which has a communicating hole which communicates with the inside of the inner container; The valve member is provided with a blocking member which switches between communication and blocking between the outlet hole and the inside of the communicating tube, and a valve member which is freely movably accommodated within the communicating tube, the valve member blocking the communicating hole and opening the communicating hole when it moves from the communicating hole side towards the discharge hole side, the blocking member is provided with a blocking body which releasably blocks the inside of the communicating tube by contacting the blocking wall portion, and a flow groove which connects the discharge hole and the inside of the communicating tube is formed between the blocking wall portion and the blocking body.

[0008] According to the discharge cap of the present invention, when the internal pressure of the inner container increases due to, for example, squeezing deformation of the double container body, the valve member moves in the communicating tube from the communicating hole side to the discharge hole side. This allows the communicating hole to be opened, allowing the contents in the inner container to flow into the communicating tube. Furthermore, since the blocking body is affected by the internal pressure of the inner container and the pressure of the contents that have flowed into the communicating tube, it moves away from the blocking wall to open the communicating tube. This allows communication between the discharge hole and the inside of the communicating tube, allowing the contents to be discharged to the outside through the discharge hole.

[0009] When the increase in the internal pressure of the inner container stops or decreases due to the cessation or release of the squeeze deformation of the double container body, the blocking body comes into contact with the blocking wall and blocks the inside of the communicating tube, thereby blocking the communication between the discharge hole and the inside of the communicating tube, and thus stopping the discharge of the contents. Furthermore, the valve member can be moved from the discharge hole side to the communication hole side in the communicating tube to close the communication hole. In particular, the movement of the valve member can produce a so-called suck-back effect, so that the contents remaining above the blocking wall can be sucked into the communicating tube. This makes it possible to prevent, for example, dripping.

[0010] In particular, unlike the conventional configuration in which the discharge passage for the contents and the recovery passage for the contents are different, the discharge passage for the contents and the recovery passage for the contents can be performed using one communicating tube, so that the recovery of the remaining contents can be appropriately performed. Furthermore, since a flow groove is formed between the blocking wall and the blocking body, even if the inside of the communicating tube is blocked by the blocking body before the contents are recovered, the contents can be reliably recovered into the communicating tube through the flow groove.

[0011] (2) The communicating tube portion comprises an upper communicating tube arranged on the blocking wall portion side, and a lower communicating tube arranged below the upper communicating tube and formed to have a smaller diameter than the upper communicating tube, and having the communicating hole formed at its lower end, and the valve member may move within the communicating tube portion while being close to or in contact with the inner surface of the lower communicating tube, and may also move within the communicating tube portion while leaving a gap between it and the inner surface of the upper communicating tube.

[0012] In this case, when the internal pressure of the inner container rises, the valve member moves toward the upper communicating cylinder, allowing the contents to flow smoothly by utilizing the gap between the valve member and the upper communicating cylinder. Therefore, for example, the contents can be easily discharged without strongly squeezing and deforming the double container body. On the other hand, when the internal pressure of the inner container stops increasing or decreases, the valve member moves from the upper communicating cylinder to the lower communicating cylinder, so that the valve member can be moved while approaching or contacting the inner peripheral surface of the lower communicating cylinder. This makes it possible to create a negative pressure inside the lower communicating cylinder, thereby more effectively exerting the suck-back effect and properly recovering the contents by at least the internal volume of the lower communicating cylinder.

[0013] (3) The valve member may be capable of pushing the obstruction upward when moving toward the discharge hole.

[0014] In this case, when the internal pressure of the inner container rises, the valve member that has moved inside the communicating tube toward the discharge hole can be used to push the closure upward. This allows the closure to be moved farther away from the blocking wall, opening the communicating tube more widely. This can promote the discharge of the contents and improve dischargeability. Furthermore, since the obstruction can be used to restrict the upward movement of the valve member, there is no need to provide a separate structure for restricting the upward movement, and therefore the valve member can be prevented from coming off the communicating tube while simplifying the structure. Effect of the Invention

[0015] According to the discharge cap of the present invention, the remaining contents can be appropriately collected. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a vertical cross-sectional view showing an embodiment of a double container equipped with a discharge cap according to the present invention. [Diagram 2] 2 is a vertical cross-sectional view of the double container, showing a state in which the discharge hole is in communication with the inside of the communicating cylindrical portion after the discharge hole has been opened from the state shown in FIG. 1. FIG. [Diagram 3] 2 is a plan view of the periphery of the communicating cylindrical portion shown in FIG. 1, viewed from below. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a discharge cap according to the present invention will be described with reference to the drawings. 1, the discharge cap 5 of this embodiment is used by being attached to the mouth portion 4a of the double container body 4. The discharge cap 5 and the double container body 4 constitute the double container 1.

[0018] (Double container body) The double container body 4 comprises a highly flexible inner container (inner layer) 2 that contains contents (not shown) and undergoes volume reduction (shrinkage) as the contents decrease, and an outer container (outer layer) 3 in which the inner container 2 is placed.

[0019] The inner container 2 and the outer container 3 are arranged with their central axes positioned on a common axis. The discharge cap 5 is arranged coaxially with this common axis. In this embodiment, this common axis is referred to as the container axis O, and the side of the discharge cap 5 along the container axis O is referred to as the upper side, and the opposite side is referred to as the lower side. In addition, in a plan view seen from the container axis O direction, the direction perpendicular to the container axis O is referred to as the radial direction, and the direction going around the container axis O is referred to as the circumferential direction.

[0020] The double container body 4 is formed by blow molding (for example, extrusion blow molding) and is a delamination type container (delamination bottle) in which the inner container 2 is peelably laminated on the inner surface of the outer container 3. The double container body 4 is formed into a bottomed cylindrical shape with a mouth 4a, a shoulder 4b, a body (not shown), and a bottom (not shown) connected in sequence from the top. The shoulder 4b gradually expands in diameter from the top to the bottom. The body is formed, for example, into a circular shape in cross section. The outer container 3 constituting the double container body 4 is capable of being squeezed and deformed, and the inner container 2 is deformed and reduced in volume in accordance with the squeeze deformation of the outer container 3. Therefore, at least a portion of the outer container 3 located in the body portion is capable of being elastically deformed radially inward (toward the inside of the container).

[0021] The mouth 4a of the double container body 4 is formed so as to extend upward from the upper end opening of the shoulder portion 4b. The mouth 4a of the double container body 4 is configured by stacking the mouth 2a of the inner container 2 and the mouth 3a of the outer container 3. An annular folded portion 2b that protrudes radially outward is formed at the upper end of the mouth 2a of the inner container 2, and the folded portion 2b is used to close the open end of the mouth 3a of the outer container 3 from above. Therefore, the mouth 3a of the outer container 3 is closed by the inner container 2. An air intake hole 6 is formed in the mouth 3a of the outer container 3 between the outer container 3 and the inner container 2, which introduces outside air via an outside air introduction hole 46 described later.

[0022] (Discharge cap) The discharge cap 5 includes an inner plug portion 10, a valve member 30, a cap body 40 in which a discharge hole 41 is formed, a closing member 50, and a lid portion 70. The inner plug portion 10 comprises a blocking wall portion 11 that blocks the mouth portion 4a of the double container body 4, and a communicating cylindrical portion 20 that extends downward from the blocking wall portion 11 and has a communicating hole 21 that communicates with the inside of the inner container 2. In the illustrated example, the blocking wall portion 11 and the communicating cylindrical portion 20 are integrally formed, but they may be formed separately.

[0023] The blocking wall portion 11 includes a flange portion 12 located on the upper end opening of the mouth portion 4a of the double container body 4, a blocking wall main body 13 located radially inward from the flange portion 12, and a connecting tube portion 14 extending in the vertical direction and connecting the inner end of the flange portion 12 and the outer end of the blocking wall main body 13. The blocking wall main body 13 is located above the flange portion 12.

[0024] A rising tube portion 15 that surrounds the connecting tube portion 14 from the radially outer side is formed so as to protrude upward from the flange portion 12. Furthermore, a sealing tube portion 16 that fits into the inside of the mouth portion 4a of the double container body 4 and seals the mouth portion 4a of the double container body 4 is formed so as to protrude downward from the flange portion 12.

[0025] The communicating cylindrical portion 20 is disposed coaxially with the container axis O, and is formed so as to extend downward from the closing wall main body 13. As a result, the communicating cylindrical portion 20 is formed so as to enter the inside of the inner container 2. The inside of the communicating cylindrical portion 20 is open at the top and bottom. The communicating tube portion 20 includes an upper communicating tube 22 arranged on the blocking wall main body 13 side, and a lower communicating tube 23 arranged below the upper communicating tube 22 and formed to have a smaller diameter than the upper communicating tube 22. Therefore, the communicating tube portion 20 is a straight tube whose diameter changes in two stages. A cylindrical valve seat portion 23a that gradually reduces in diameter toward the lower end portion is formed in the lower portion of the lower communication cylinder 23. The lower end opening of the lower communication cylinder 23 functions as the communication hole 21.

[0026] The valve member 30 is housed in the communicating cylinder portion 20 so as to be vertically movable, and is seated on the inner circumferential surface of the valve seat portion 23a so as to be movable upward. In this way, the valve member 30 openably closes the communicating hole 21. In the illustrated example, the valve member 30 is a so-called ball valve formed in a spherical shape.

[0027] When the internal pressure of the inner container 2 increases or when the double container body 4 changes its posture from the upright posture (tilts or turns upside down), the valve member 30 moves from the communication hole 21 side toward the discharge hole 41 side to open the communication hole 21. When the internal pressure of the inner container 2 stops increasing or decreases or when the double container body 4 returns to the upright posture, the valve member 30 moves toward the communication hole 21 side to close the communication hole 21. In particular, when the valve member 30 moves from the discharge hole 41 side toward the communicating hole 21 side, a so-called suck-back effect is generated, enabling the contents remaining above the blocking wall portion 11 to be drawn into the inside of the communicating tube portion 20.

[0028] The valve member 30 is formed with a diameter slightly smaller than the inner diameter of the lower communicating cylinder 23. Therefore, the valve member 30 moves within the communicating cylinder portion 20 while being close to or in contact with the inner peripheral surface of the lower communicating cylinder 23, and also moves within the communicating cylinder portion 20 while leaving a gap between itself and the inner peripheral surface of the upper communicating cylinder 22. The valve member 30 may be made of either synthetic resin or metal. When the valve member 30 is made of synthetic resin, it is possible to make all of the components constituting the double container 1, for example, out of synthetic resin. This allows for cost reduction and allows the double container 1 to be disposed of without the need to separate the components into different materials.

[0029] The cap body 40 is formed in a topped cylindrical shape having an outer tube portion 42 screwed onto the mouth portion 4a of the double container body 4, and a top wall portion 43 connected to the upper end of the outer tube portion 42 and covering the upper part of the mouth portion 4a of the double container body 4. The discharge cap 5 is detachably attached to the mouth 4a of the double container body 4 via the cap body 40. Note that the cap body 40 is not limited to being screwed to the mouth 4a of the double container body 4, and may be, for example, undercut fitted.

[0030] The top wall portion 43 is formed with a step so that the central top wall portion 45 is located higher than the outer top wall portion 44 connected to the outer cylinder portion 42. An outside air introduction hole 46 is formed in the top wall portion 43 at the connection portion between the outer top wall portion 44 and the central top wall portion 45. The outside air introduction hole 46 is formed, for example, in a circular arc shape in a plan view extending along the circumferential direction. However, this is not limited to this case, and for example, a plurality of outside air introduction holes 46 may be formed at intervals in the circumferential direction.

[0031] A downwardly extending cylindrical portion 47 and a discharge cylindrical portion 48 having an outer diameter smaller than that of the downwardly extending cylindrical portion 47 are formed in the central ceiling wall portion 45 . The hanging tube portion 47 is disposed radially inward of the outside air introduction hole 46, and is formed so as to protrude downward from the central top wall portion 45. The discharge tube portion 48 is formed at a position shifted radially with respect to the container axis O, and is formed so as to penetrate the central top wall portion 45 from top to bottom. The discharge tube portion 48 is capable of communicating with the inside of the communication tube portion 20, and the diameter of the inner circumferential surface thereof gradually increases from bottom to top. The upper end opening of the discharge tube portion 48 serves as the discharge hole 41 for discharging the contents.

[0032] Between the inside plug portion 10 and the cap body 40 configured as described above, a blocking member 50 and an outside air introduction valve (air valve) 60 are disposed.

[0033] The blocking member 50 is a member that switches between communication and blocking between the discharge hole 41 and the inside of the communication tube portion 20. In this embodiment, a three-point valve (multipoint valve) will be taken as an example of the blocking member 50 and described. The blocking member 50 comprises a blocking body 51 which seats (contacts) releasably against the blocking wall main body 13, and multiple (three) elastic arms 52 which connect the blocking body 51 together with a cylindrical portion 61 of the outside air introduction valve 60, which will be described later.

[0034] The blocking body 51 is formed, for example, in a circular shape in a plan view, and openably blocks the upper opening of the communicating cylindrical portion 20. The elastic arm 52 is formed, for example, to extend in the circumferential direction, thereby ensuring appropriate springiness. The elastic arm 52 has an inner end connected to the outer edge of the blocking body 51, and an outer end connected to the cylindrical portion 61. When the internal pressure of the inner container 2 increases due to squeezing deformation of the outer container 3, etc., the elastic arm 52 elastically deforms to move the obstruction body 51 upward as shown in Figure 2, thereby separating the obstruction body 51 from the obstruction wall main body 13.

[0035] As a result, when the internal pressure of the inner container 2 rises, the inside of the communicating tubular portion 20 can be opened to communicate between the discharge hole 41 and the inside of the communicating tubular portion 20. Furthermore, in this embodiment, when the valve member 30 in the communicating tubular portion 20 moves toward the discharge hole 41, it can push the obstruction body 51 upward as shown in Fig. 2. This allows the inside of the communicating tubular portion 20 to be widely opened.

[0036] The number of elastic arms 52 is not limited to three. Furthermore, the closing member 50 may have a valve structure other than that described above as long as it can open the inside of the communicating cylindrical portion 20 when the internal pressure of the inner container 2 increases. Furthermore, the closing member 50 is not limited to a valve.

[0037] The outside air introduction valve 60 comprises a cylindrical portion 61 whose lower end is fitted inside the raised cylindrical portion 15 formed in the blocking wall portion 11 and whose upper end is fitted inside the hanging cylindrical portion 47 formed in the central top wall portion 45, and an elastically deformable valve body 62 that protrudes in a ring shape radially outward from the outer circumferential surface of the cylindrical portion 61 and has an outer end that is a free end.

[0038] The valve body 62 has an outer end portion which is in detachable contact with the lower surface of the outer top wall portion 44 from below over the entire circumference. As a result, the outside air introduction valve 60 opensably closes the outside air introduction hole 46 from inside the cap body 40. In other words, the valve body 62 functions as a check valve which allows the inflow of outside air from the outside through the outside air introduction hole 46 and restricts the outflow of outside air to the outside through the outside air introduction hole 46. The outside air that flows in from the outside through the outside air inlet hole 46 flows between the inner container 2 and the outer container 3 through the air intake hole 6 formed in the outer container 3, as indicated by the arrow in FIG.

[0039] Since the cylindrical portion 61 of the outside air introduction valve 60 is fitted into the blocking wall portion 11 of the inside plug portion 10 and the central top wall portion 45 of the cap body 40, the inside plug portion 10 and the cap body 40 are combined together via the outside air introduction valve 60. This allows the inside plug portion 10 and the cap body 40 to be handled as a single unit. Although the blocking member 50 and the outside air introduction valve 60 are formed integrally, they may be separate members.

[0040] As shown in FIGS. 1 to 3, a communication groove 65 that communicates between the discharge hole 41 and the inside of the communication tube portion 20 is formed between the blocking wall portion 11 and the blocking body 51. Specifically, the communication groove 65 is formed on the upper surface of the blocking wall main body 13 so as to be slightly recessed downward and extend linearly along the radial direction. The communication groove 65 is formed so that one end reaches the inside of the communicating tube portion 20 and the other end reaches the tube portion 61. As a result, the communication groove 65 is formed so as to extend radially outward beyond the outer circumferential edge portion of the blocking body 51. Therefore, the discharge hole 41 and the inside of the communicating tube portion 20 can be communicated with each other through the communication groove 65.

[0041] The number of flow grooves 65 is not limited to one, and a plurality of flow grooves may be formed, for example, so as to be arranged radially with the container axis O as the center.

[0042] As shown in FIG. 1, the lid portion 70 is formed into a cylindrical shape with a top by a peripheral wall portion 71 and a top wall portion 72, and is detachably fitted onto the upper end portion of the outer tube portion 42 of the cap body 40. A seal shaft 73 protruding downward is formed on the top wall portion 72. The seal shaft 73 is inserted into the discharge tube portion 48 from above, and the lower end portion is detachably fitted inside the discharge tube portion 48. In this way, the seal shaft 73 regulates the discharge of the content through the discharge hole 41.

[0043] The peripheral wall portion 71 is connected to the outer tube portion 42 via a hinge portion 74. This allows the lid portion 70 to rotate about the hinge portion 74, and the seal shaft 73 can be inserted and removed from the discharge tube portion 48 as the lid portion 70 rotates, thereby opening and closing the discharge hole 41. In addition, an operation protrusion 75 is formed on the peripheral wall 71 so as to protrude radially outward from a portion located on the opposite side of the hinge portion 74 across the container axis O. This makes it possible to easily perform the rotation operation of the lid portion 70 by utilizing the operation protrusion 75.

[0044] (Action of the discharge cap) Next, a case where the double container 1 having the discharge cap 5 configured as described above is used will be described. 1 is rotated about the hinge 74 to open the discharge hole 41, and then the outer container 3 of the double container body 4 is squeezed (elastically deformed) radially inward while, for example, tilting or turning upside down the double container body 4. As a result, the inner container 2 deforms radially inward together with the outer container 3, reducing its volume, and the internal pressure of the inner container 2 increases.

[0045] Then, as shown in Fig. 2, the valve member 30 moves from the communication hole 21 side toward the discharge hole 41 side in the communication tubular portion 20, so that the communication hole 21 can be opened. Therefore, the contents in the inner container 2 can flow into the communication tubular portion 20. Furthermore, the blocking body 51 in the blocking member 50 is affected by the internal pressure of the inner container 2 and the pressure of the contents that have flowed into the communication tubular portion 20, so that it moves away from the blocking wall main body 13 and opens the communication tubular portion 20. In other words, the blocking member 50 opens the valve, so that the discharge hole 41 and the inside of the communication tubular portion 20 can be communicated. Therefore, the contents contained inside the inner container 2 can be discharged to the outside through the discharge hole 41.

[0046] Thereafter, when the increase in the internal pressure of the inner container 2 stops or decreases due to the cessation or release of the squeeze deformation of the double container body 4, the blocking body 51 returns to its original state due to the restoration deformation of the elastic arm 52, and sits on the upper surface of the blocking wall body 13. This makes it possible to block the inside of the communicating tube portion 20 again. In other words, the blocking member 50 closes the valve, so that it is possible to block the communication between the discharge hole 41 and the inside of the communicating tube portion 20. This makes it possible to stop the discharge of the contents.

[0047] Furthermore, as the squeeze deformation of the double container body 4 is released, the outer container 3 begins to deform to its original shape, generating a negative pressure between the outer container 3 and the inner container 2. This negative pressure then acts on the outside air introduction valve 60 through the air intake hole 6, causing the outer end of the valve body 62 to move downwardly away from the lower surface of the outer top wall portion 44, opening the outside air introduction hole 46. This allows outside air to flow in from the outside through the air intake hole 46, and to flow between the inner container 2 and the outer container 3 through the air intake hole 6. As a result, even if the outer container 3 is deformed to its original shape, the inner container 2 can be separated from the inner surface of the outer container 3 and kept in the state of reduced volume deformation.

[0048] Furthermore, by returning the double container body 4 to its upright position in accordance with the cessation of the increase or decrease in the internal pressure of the inner container 2 accompanying the release of the squeeze deformation of the double container body 4, the valve member 30 can be moved from the discharge hole 41 side toward the communication hole 21 side within the communication tube portion 20, thereby closing the communication hole 21. At this time, it is possible to move the valve member 30 toward the communication hole 21 side not only by the weight of the valve member 30 itself but also by the negative pressure caused by the restoring force of the inner container 2.

[0049] In particular, the movement of the valve member 30 creates a suck-back effect, so that even if any contents remain between the discharge tube portion 48 and the blocking wall main body 13, the remaining contents can be drawn into the communicating tube portion 20. This makes it possible to prevent the remaining contents from dripping or leaking to the outside through the discharge hole 41.

[0050] Furthermore, it is also possible to use the increase in internal pressure in the inner container 2 to move the valve member 30 in the communicating cylindrical portion 20 toward the discharge hole 41, so it is not necessarily necessary to tilt or turn the double container body 4 upside down when discharging the contents.

[0051] In particular, according to the discharge cap 5 of this embodiment, unlike the conventional configuration in which the discharge passage for the contents and the recovery passage for the contents are separate, a single communicating tube portion 20 can be used to discharge the contents and recover the contents, so that any remaining contents can be properly recovered. Furthermore, since a flow groove 65 is formed between the blocking wall main body 13 and the blocking body 51, even if the inside of the communicating tube portion 20 is blocked by the blocking body 51 before the contents are recovered, the contents can be reliably recovered into the communicating tube portion 20 through the flow groove 65.

[0052] Furthermore, when the internal pressure of the inner container 2 rises, the valve member 30 moves toward the upper communicating cylinder 22, allowing the contents to flow smoothly by utilizing the gap between the valve member 30 and the upper communicating cylinder 22. Therefore, the contents can be easily discharged without, for example, strongly squeezing and deforming the double container body 4. On the other hand, when the increase in the internal pressure of the inner container 2 stops or decreases, the valve member 30 moves from the upper communicating cylinder 22 side to the lower communicating cylinder 23 side, so that the valve member 30 can be moved while approaching or contacting the inner peripheral surface of the lower communicating cylinder 23. Therefore, the inside of the lower communicating cylinder 23 can be made negative pressure, the suck-back effect can be exerted more effectively, and the contents can be appropriately recovered at least to the internal volume of the lower communicating cylinder 23.

[0053] Furthermore, when the internal pressure of the inner container 2 rises, as shown in Fig. 2, the valve member 30, which has moved inside the communicating tubular portion 20 toward the discharge hole 41, can be used to push the obstructing body 51 upward. This allows the obstructing body 51 to be largely separated from the blocking wall main body 13, and the inside of the communicating tubular portion 20 to be largely opened. This can therefore promote the discharge of the contents, improving the dischargeability. In particular, even if the obstruction body 51 does not open due to the pressure of the contents or the amount of opening (size) is small, the valve member 30 pushes up the obstruction body 51, making it possible to properly open the obstruction body 51. Furthermore, since the upward movement of the valve member 30 can be restricted by utilizing the obstruction body 51, there is no need to provide a separate structure for restricting the upward movement. Therefore, it is possible to prevent the valve member 30 from coming off from the communicating tube portion 20 while simplifying the structure.

[0054] Although the embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. The embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. The embodiments and their modifications include, for example, those that can be easily imagined by a person skilled in the art, those that are substantially the same, those that are within the scope of the equivalents, and the like.

[0055] For example, in the above embodiment, the double container 1 is a laminated peelable type container in which the inner container 2 is peelably laminated to the inner surface of the outer container 3, but this is not limited to this, and the double container may also have a gap between the inner container 2 and the outer container 3.

[0056] In the above embodiment, the outside air introduction valve 60 is not essential and may not be provided. In this case, for example, the opening size of the outside air introduction hole 46 or the air intake hole 6 may be reduced so that the air between the outer container 3 and the inner container 2 is less likely to flow out to the outside when the outer container 3 is squeezed and deformed.

[0057] In the above embodiment, the flow groove 65 is formed on the upper surface of the blocking wall main body 13, but this is not limited to this case, and for example, the flow groove 65 may be formed on the lower surface of the blocking body 51 that sits on the upper surface of the blocking wall main body 13. In any case, it is sufficient that the flow groove 65 is formed between the blocking wall portion 11 and the blocking body 51. [Explanation of symbols]

[0058] 1…Double container 2…Inner container 3…Outer container 4…Double container body 4a…Mouth of double container body 5…Discharge cap 10…Inner plug 11...Closing wall part 20...Communication cylinder part 21...Communication hole 22…Upper communication tube 23…Lower communication tube 30...Valve member 40…Cap body 41...Discharge hole 50...Blocking member 51...Occluded body 65…Flow groove

Claims

1. A discharge cap is attached to the mouth of a double container body having an inner container that is deformed as the contents are stored and the inner container is inserted into an outer container, A cap body that is attached to the mouth of the double container body and has a discharge hole for the content; a middle plug portion having a closing wall portion that closes the mouth of the double container body, and a communicating tube portion that extends downward from the closing wall portion and has a communicating hole that communicates with the inside of the inner container; a blocking member for switching between communication and blocking between the discharge hole and the inside of the communication tube portion; a valve member movably accommodated in the communicating cylindrical portion, the valve member closes the communication hole and opens the communication hole when it moves from the communication hole side toward the discharge hole side, the blocking member includes a blocking body that releasably blocks the communication tube portion by being in contact with the blocking wall portion, A discharge cap, characterized in that a communication groove is formed between the blocking wall portion and the blocking body, the communication groove connecting the discharge hole and the inside of the communicating cylindrical portion.

2. The discharge cap according to claim 1 , The communicating cylindrical portion is An upper communication cylinder arranged on the blocking wall portion side; a lower communicating cylinder that is disposed below the upper communicating cylinder, is formed to have a smaller diameter than the upper communicating cylinder, and has the communicating hole formed at a lower end thereof, The valve member moves within the communicating tube portion while being in close proximity to or in contact with the inner circumferential surface of the lower communicating tube, and also moves within the communicating tube portion while leaving a gap between it and the inner circumferential surface of the upper communicating tube.

3. The discharge cap according to claim 1 or 2, The valve member is capable of pushing the closing body upward when it moves toward the discharge hole.

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