JP2021172373A - Double container - Google Patents

Abstract

To enable exhibiting a stable discharge function and improving discharge operability.SOLUTION: Provided is a double container 1 comprising: a container body 4 having an inner container 2 and an outer container 3; and a discharge cap 5 in which a discharge hole 44 is formed. A first screw part 10 is formed at a mouth part 4a of the container body. The discharge cap comprises: a fitting cylinder part 41 where a second screw part 11 is formed; and a discharge valve 70 for switching communication and shutdown between the discharge hole and the inside of the container body. A seal part 7 located below a suction hole 6 is provided at the mouth part of the container body; a protrusion wall part 48 located above the second screw part is formed in the fitting cylinder part; a contact surface 2c where a vertical position of the discharge cap is determined by coming into contact with the protrusion wall part from below is provided at an upper end of the mouth part of the container body; and in at least either one of the protrusion wall part and the mouth part of the container body, a ventilation path 8 that allows inflow of outside air into the suction hole side through a space between the protrusion wall part and the contact surface is formed.SELECTED DRAWING: Figure 1

Description

The present invention relates to a double container.

A container body having an inner container whose volume is reduced and deformed as the contents are contained and an outer container in which the inner container is housed, and a container body which is screwed to the mouth of the container body and discharges the contents. A double container with a perforated discharge cap and a double container is known (see, for example, Patent Document 1).
The discharge cap is formed with an outside air introduction hole (vent) that communicates between the outside and the inner container and the outer container, and a discharge valve that switches between communication and shutoff between the discharge hole and the inside of the container body. A check valve) is provided.

In this double container, when the outer container is pressed inward in the radial direction, the discharge valve opens and the discharge hole and the inside of the container body communicate with each other, so that the contents can be discharged from the discharge hole to the outside. It becomes. Further, when the volume of the inner container is reduced and deformed due to the discharge of the contents, a negative pressure is generated between the inner container and the outer container when the outer container is restored and deformed, so that the inner container and the outer container are connected through the outside air introduction hole. Outside air can be introduced in between. As a result, it is possible to maintain the inner container in the state of being volume-reduced and deformed while restoring and deforming the outer container.

JP-A-2019-151404

However, in the above-mentioned conventional double container, if the discharge cap is tightened too strongly against the mouth of the container body during manufacturing, at least one of the synthetic resin discharge cap and the container body will be used. There was a risk that it would be deformed and the discharge function could not be exhibited.
Specifically, if the discharge cap is tightened too strongly against the mouth of the container body, the lower end side of the mounting cylinder (side wall) of the discharge cap will be deformed so as to expand outward in the radial direction. , There was a risk that there would be a gap between the container and the outer peripheral surface of the mouth. In this case, it becomes difficult to properly take in the outside air through the outside air introduction hole, and the air (outside air) taken in between the inner container and the outer container easily leaks to the outside through the above gap. It ends up.
Therefore, when the outer container is pressed inward in the radial direction during use, the air existing between the inner container and the outer container is discharged to the outside, and the pressing force applied to the outer container is applied to the inner container. It becomes difficult to convey. That is, it becomes difficult to transmit the pressing force applied to the outer container to the inner container through the air layer existing between the inner container and the outer container. Therefore, even if the outer container is pressed inward in the radial direction, the inner container cannot be pressed until the outer container itself comes into direct contact with the inner container, whereby the discharge valve can be opened. It cannot be connected to the discharge of the contents.

As described above, in the conventional double container, there is a gap between the mounting cylinder portion of the discharge cap and the outer peripheral surface of the mouth portion of the container body, so that the container is taken in between the inner container and the outer container at the time of discharge. However, it was easy for air to leak to the outside, resulting in a decrease in sealing performance. As a result, there is a risk that the contents cannot be discharged stably. Further, due to poor sealing performance, even if the outer container is pressed inward in the radial direction as described above, the discharge valve may not be opened until the outer container itself comes into direct contact with the inner container. Yes, the discharge operation becomes difficult. In particular, as the remaining amount of the contents decreases, the volume of the inner container is reduced and deformed, so that it becomes necessary to press the outer container with a larger pressing force, which makes the discharge operation even more difficult.

The present invention has been made in view of such circumstances, and an object of the present invention is to prevent air (outside air) taken in between an inner container and an outer container from leaking to the outside. It is an object of the present invention to provide a double container capable of exhibiting a stable discharge function and having improved discharge operability.

(1) The double container according to the present invention includes a container body including an inner container in which the contents are accommodated and whose volume is reduced and deformed as the contents are reduced, and an outer container in which the inner container is housed. A discharge cap having a top wall portion screwed to the mouth portion of the container body and formed with a discharge hole for the contents is provided, and a first screw portion is formed at the mouth portion of the container body. At the same time, an intake hole for introducing outside air is formed between the outer container and the inner container, and the discharge cap surrounds the mouth portion of the container body from the outside in the radial direction and is screwed into the first screw portion. A mounting cylinder portion on which a second screw portion to be attached is formed, and a discharge valve for switching communication and shutoff between the discharge hole and the inside of the container body are provided, and the mouth portion of the container body is provided with an intake hole. Is also located below and is provided with a sealing portion that seals between the mounting cylinder portion, and the mounting cylinder portion protrudes inward in the radial direction and is above the second screw portion. A protruding wall portion to be located is formed, and the upper end portion of the mouth portion of the container body is in contact with the protruding wall portion from below to position the vertical position of the discharge cap with respect to the mouth portion of the container body. A contact surface is provided, and at least one of the protruding wall portion and the mouth portion of the container body allows outside air to flow into the intake hole side through between the protruding wall portion and the contact surface. It is characterized in that a ventilation path is formed.

According to the double container according to the present invention, for example, the outer container is pressed inward in the radial direction to reduce the volume and deform the inner container together with the outer container, thereby increasing the internal pressure of the inner container and forming the discharge valve. The valve can be opened. As a result, the discharge hole and the inside of the container body can be communicated with each other, and the contents can be discharged from the discharge hole to the outside. Further, when the inner container is volume-reduced and deformed due to the discharge of the contents, a negative pressure is generated between the inner container and the outer container when the outer container is restored and deformed. As a result, outside air can be introduced between the inner container and the outer container through the ventilation passage and the intake hole, and the inner container can be maintained in the state of being reduced in volume and deformed while the outer container is restored and deformed. It will be possible. In this way, the contents can be discharged while gradually reducing and deforming the inner container.

In particular, when manufacturing a double container, the discharge cap can be easily attached to the mouth of the container body by simply tightening the discharge cap to the mouth of the container body. At this time, when the tightening end of the discharge cap is reached, the protruding wall portion formed on the mounting cylinder portion comes into contact with the contact surface formed on the upper end portion of the mouth portion of the container body from above. As a result, the vertical position of the discharge cap with respect to the mouth of the container body can be positioned, and the tightening position of the discharge cap can be positioned by suppressing further tightening operations.
Therefore, since deformation or the like due to excessive tightening does not occur in the mouth portion of the container body or the mounting cylinder portion, the sealing portion can be used to reliably seal the container with the mounting cylinder portion, and the intake air can be taken. It is possible to prevent the hole from communicating with the outside at an unintended location. Therefore, after the contents are discharged, the outside air can be surely introduced between the inner container and the outer container through the intake hole.

In addition, since it is possible to prevent the intake hole from communicating with the outside at an unintended location, it is possible to prevent the air (outside air) taken in between the inner container and the outer container from leaking to the outside during use. can do. Therefore, the air taken in between the inner container and the outer container can be appropriately present, and when the outer container is pressed inward in the radial direction, the pressing force applied to the outer container is applied through the air layer. Can be properly communicated to the inner container. As a result, the inner container can be pressed, and the discharge valve can be opened responsively and smoothly. As a result, it is possible to obtain a double container that exhibits a stable discharge function.
Further, even if the remaining amount of the contents is low, the pressing force applied to the outer container can be efficiently transmitted to the inner container through the air layer existing between the inner container and the outer container, which is large. It is not necessary to press the outer container with the pressing force, and the discharge operability can be improved.

(2) A flow hole for communicating the inside of the container body and the discharge hole is formed, and an inner plug portion for closing the mouth portion of the container body is provided, and the inner plug portion is fitted inside the protruding wall portion. When combined, the discharge valve may be integrally combined with the discharge cap, and the discharge valve may be arranged between the inner plug portion and the top wall portion.

In this case, when manufacturing a double container, before screwing the discharge cap to the mouth of the container body, the discharge valve is placed between the top wall and the inside of the protruding wall. By fitting the inner plug portion, the discharge valve, the inner plug portion and the discharge cap can be integrally combined and handled as one unit. Therefore, by screwing the discharge cap to the mouth of the container body, it is possible to efficiently manufacture the double container.

(3) The rigidity of the mouth portion of the container body may be higher than the rigidity of the mounting cylinder portion.

In this case, the discharge cap can be easily attached to the mouth of the container body, and the manufacturing efficiency can be improved. If the rigidity of the mouth of the container body is higher than that of the mounting cylinder, when the discharge cap is excessively tightened, for example, the lower end of the mounting cylinder expands outward in the radial direction. Is easy to induce. However, as described above, since the excessive tightening operation of the discharge cap can be suppressed by using the protruding wall portion and the contact surface, the discharge cap is appropriately mounted while suppressing the deformation of the mounting cylinder portion and the like. It becomes possible.

According to the double container according to the present invention, the discharge cap can be attached to the container body in an appropriate positional relationship while suppressing excessive tightening. Therefore, it is possible to prevent the air (outside air) taken in between the inner container and the outer container from leaking to the outside, and it is possible to exert a stable discharge function and improve the discharge operability. It can be a heavy container.

It is a vertical sectional view which shows the 1st Embodiment of the double container which concerns on this invention. It is a vertical cross-sectional view of a double container which shows the state which opened the lid part and opened the discharge hole from the state shown in FIG. It is a vertical sectional view which shows the 2nd Embodiment of the double container which concerns on this invention.

(First Embodiment)
Hereinafter, the first embodiment according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, the double container 1 of the present embodiment is a highly flexible inner container (inner layer) in which contents (not shown) are accommodated and the volume is reduced and deformed (deflated) as the contents decrease. A container body 4 having an outer container (outer layer) 3 in which the inner container 2 is housed, and a discharge cap 5 detachably attached to the mouth portion 4a of the container body 4 are provided.

The inner container 2 and the outer container 3 are arranged in a state where their respective central axes are positioned on a common axis. The discharge cap 5 is arranged coaxially with the common shaft. In the present embodiment, this common shaft is referred to as a container shaft O, the discharge cap 5 side along the container shaft O is referred to as an upper side, and the opposite side thereof is referred to as a lower side. Further, in a plan view from the direction of the container axis O, the direction intersecting the container axis O is referred to as the radial direction, and the direction of orbiting around the container axis O is referred to as the circumferential direction.

The container body 4 is formed by blow molding, and is a laminated peeling type container (derami bottle) in which the inner container 2 is detachably laminated on the inner surface of the outer container 3.
Specifically, a preform for the outer container 3 and a preform for the inner container 2 are formed by injection molding or the like, and these are combined in a double (inner and outer) manner, and then biaxially stretched and blow molded to form the container body. 4 is formed.
The preform for the outer container 3 is first biaxially stretch-blow molded to form the outer container 3, then the preform for the inner container 2 is placed inside, and then the preform for the inner container 2 is formed. The container body 4 may be formed by biaxial stretching blow molding.

The material of the inner container 2 and the outer container 3 is not particularly limited, but is, for example, PET (polyethylene terephthalate) resin. However, the materials of the inner container 2 and the outer container 3 may be the same material or different materials as long as they are a peelable combination.

The container body 4 is formed in a bottomed cylindrical shape in which a mouth portion 4a, a shoulder portion (not shown), a body portion (not shown), and a bottom portion (not shown) are connected in order from the upper side. The outer container 3 constituting the container body 4 is squeeze-deformable, and the inner container 2 is volume-reduced and deformed as the outer container 3 is squeeze-deformed. Therefore, at least the portion of the outer container 3 located on the body portion is elastically deformable toward the inside in the radial direction (inside the container).

The mouth portion 4a of the container body 4 is formed so as to extend upward from the upper end opening of the shoulder portion. The mouth portion 4a of the container body 4 is composed of a mouth portion 2a of the inner container 2 and a mouth portion 3a of the outer container 3. An intake hole 6 for introducing outside air via an outside air introduction hole 47, which will be described later, is formed between the outer container 3 and the inner container 2 at the mouth portion 3a of the outer container 3.

At the upper end of the mouth 2a of the inner container 2, a collar 2b is provided to close the upper end of the mouth 3a of the outer container 3 from above. The inner container 2 is laminated with respect to the upper end portion of the mouth portion 3a of the outer container 3 in a state where the mouth portion 3a of the outer container 3 is closed by using the collar portion 2b.
The mouth portion 2a of the inner container 2 is arranged inside the mouth portion 3a of the outer container 3 with a portion excluding the upper end portion being left between the mouth portion 3a of the outer container 3 and the mouth portion 3a of the outer container 3. In the shoulder and body of the container body 4, the inner container 2 and the outer container 3 are detachably laminated as described above.

The collar portion 2b is formed so as to project outward in the radial direction from the support cylinder portion 30 of the inner plug portion 20 described later. The upper surface of the flange portion 2b functions as a contact surface 2c on the outside of the support cylinder portion 30 that faces the protruding wall portion 48 described later from below and is in contact with the protruding wall portion 48 from below. Then, the vertical position of the discharge cap 5 with respect to the mouth portion 4a of the container body 4 can be positioned by the contact between the protruding wall portion 48 and the contact surface 2c.

Further, the flange portion 2b is formed with a plurality of ventilation passages 8 that penetrate the collar portion 2b in the vertical direction and open on the outer peripheral edge side of the collar portion 2b at intervals in the circumferential direction. However, it is not necessary that a plurality of ventilation passages 8 are formed, and for example, only one ventilation passage 8 may be formed.
Further, the ventilation passage 8 does not need to penetrate the flange portion 2b in the vertical direction, and may be formed in a lateral groove shape extending along the radial direction in a state of being recessed downward from the contact surface 2c, for example.
When the ventilation path is formed in the shape of a lateral groove, it may be formed so as to extend inward in the radial direction from the protruding wall portion 48 and to open to the outer peripheral edge portion side of the flange portion 2b.

The above-mentioned ventilation passage 8 makes it possible to allow the inflow of outside air to the intake hole 6 side through between the protruding wall portion 48 and the contact surface 2c at the flange portion 2b of the inner container 2.

A male threaded portion (first threaded portion) 10 is formed on the outer peripheral surface of the outer container 3, and an annular seal protrusion protruding outward in the radial direction is provided at a portion located below the intake hole 6. Part 7 is formed. The seal protrusion 7 protrudes outward in the radial direction from the male screw portion 10.
A ventilation groove 12 extending in the vertical direction is formed on the outer peripheral surface of the outer container 3 mainly at a portion located above the intake hole 6. The ventilation groove 12 is formed so as to vertically traverse the male screw portion 10 and communicates with the intake hole 6. This makes it possible to guide the outside air to the intake hole 6 through the ventilation groove 12. In the illustrated example, a plurality of ventilation grooves 12 are formed at intervals in the circumferential direction, but the present invention is not limited to this case.

The discharge cap 5 includes an inner plug portion 20, a cap body 40, and a lid portion 50.
The inner plug portion 20 is housed in the base portion 21 arranged on the upper end opening end of the mouth portion 4a of the container body 4, the accommodating cylinder portion 22 penetrating the base portion 21 in the vertical direction, and the accommodating cylinder portion 22. It is provided with a valve body portion 23. In the illustrated example, the base portion 21 and the accommodating cylinder portion 22 are integrally formed, but they may be formed separately.

The base portion 21 includes an annular outer base portion 25 located on the upper end opening end of the mouth portion 4a of the container body 4, and a plan-view circular inner base portion 26 located radially inside the outer base portion 25. , The outer tubular portion 27 extending downward from the inner peripheral edge portion of the outer base portion 25, the inner tubular portion 28 extending downward from the outer peripheral edge portion of the inner base portion 26, and the lower end portion of the outer tubular portion 27. It is provided with an annular connecting flange portion 29 that connects the lower end portion of the inner cylinder portion 28 in the radial direction.
The outer base portion 25 and the inner base portion 26 are arranged at the same height positions as each other. Further, the outer cylinder portion 27 surrounds the inner cylinder portion 28 from the outside in the radial direction with a space between the outer cylinder portion 27 and the inner cylinder portion 28. As a result, the portion surrounded by the outer cylinder portion 27, the inner cylinder portion 28, and the connecting flange portion 29 is formed as an annular space that opens upward.

Further, a support cylinder portion 30 that projects upward and supports the cap body 40 from below is formed on the outer peripheral edge portion of the outer base portion 25. The support cylinder portion 30 is formed so that the outer diameter is smaller than the outer diameter of the flange portion 2b of the inner container 2. As a result, the flange portion 2b protrudes outward in the radial direction from the support cylinder portion 30 as described above.
At the connecting portion between the outer base portion 25 and the support cylinder portion 30, a plurality of air holes 31 penetrating the outer base portion 25 in the vertical direction and penetrating the support cylinder portion 30 in the radial direction are provided at intervals in the circumferential direction. It is formed. At this time, the air holes 31 are formed so as to coincide with the air passages 8 formed in the flange portion 2b of the inner container 2 in the circumferential direction, and communicate with the air passages 8. As long as the air holes 31 communicate with the ventilation passage 8, the formation position, the number, and the like may be appropriately changed.
Further, the outer base portion 25 is formed with a seal cylinder portion 32 projecting downward. The seal cylinder portion 32 is tightly fitted inside the mouth portion 4a of the container body 4 to seal the mouth portion 4a of the container body 4.

In the inner base portion 26, a flow hole 33 for circulating the contents is formed at a position displaced in the radial direction with respect to the container shaft O, and is located on the side opposite to the flow hole 33 with the container shaft O interposed therebetween. The storage cylinder portion 22 is formed so as to do so.

The accommodating cylinder portion 22 is formed so as to project downward from a portion of the inner base portion 26 adjacent to the distribution hole 33. In the illustrated example, the accommodating cylinder portion 22 is arranged so as to be displaced in the radial direction with respect to the container shaft O, and a part thereof is integrated with the inner cylinder portion 28.
The inside of the accommodating cylinder 22 is an accommodating space for accommodating the remaining contents, and is open vertically. A reduced diameter portion (valve seat portion) 22a that gradually reduces in diameter toward the lower end portion is formed in the lower portion of the accommodating cylinder portion 22.

It should be noted that a regulating projection (not shown) for restricting the upward release of the valve body portion 23 may be formed on the inner surface of the upper portion of the accommodating cylinder portion 22 so as to project inward in the radial direction.
When forming the regulating protrusion, for example, it may be formed in an annular shape over the entire circumference of the inner surface of the accommodating cylinder portion 22, or it may be formed so as to project convexly at one position on the inner surface of the accommodating cylinder portion 22. Alternatively, a plurality of convex protrusions may be formed at intervals along the circumferential direction of the inner surface.

The valve body portion 23 is accommodated in the accommodating cylinder portion 22 so as to be movable in the vertical direction, and is seated on the inner peripheral surface of the reduced diameter portion 22a so as to be detachable upward. In the illustrated example, the valve body portion 23 is a so-called ball valve formed in a spherical shape.
When the valve body portion 23 moves to the side opposite to the diameter reduction portion 22a when the container body 4 is tilted or turned upside down when discharging the contents, and the container body 4 is returned to the original upright posture. In addition, it moves to the reduced diameter portion 22a side due to its own weight or the negative pressure generated by the restoring force of the inner container 2. As a result, the residual contents existing on the upper side of the base portion 21 can be drawn into the inside of the accommodating cylinder portion 22, and the so-called suckback effect makes it possible to avoid dripping.

The valve body portion 23 may be made of either synthetic resin or metal, but if it is made of metal, it can move smoothly due to its own weight, so that the suckback effect can be further enhanced. can.

When the valve body portion 23 is made of synthetic resin, all the members constituting the double container 1 can be made of synthetic resin, which can reduce the cost and each member. The double container 1 can be discarded without performing the work of separating the different materials.
Further, when the valve body portion 23 made of synthetic resin is used, the mass and the specific gravity with respect to the contents can be lightened as compared with the case where the valve body portion 23 is made of metal. When the squeeze deformation in the radial direction with respect to the outer container 3 is released in the state where the valve body portion 23 is in the downward discharge posture, the valve body portion 23 is smoothly seated on the inner peripheral surface of the diameter reduction portion 22a. It becomes easy to make it. Therefore, the valve body portion 23 can be used to prevent outside air from entering the inner container 2 through the inside of the accommodating cylinder portion 22.

The cap main body 40 is connected to the mounting cylinder portion 41 screwed to the mouth portion 4a of the container main body 4 and the upper end portion of the mounting cylinder portion 41, and is connected to the upper end portion of the mounting cylinder portion 41 and covers the upper portion of the mouth portion 4a of the container main body 4. And, it is formed in the shape of an eclipse cylinder. Therefore, the discharge cap 5 is detachably attached to the mouth portion 4a of the container body 4 via the cap body 40.

The mounting cylinder portion 41 is arranged below the upper cylinder portion 41a and the upper cylinder portion 41a that surround the portion of the mouth portion 4a of the container body 4 that is mainly located above the intake hole 6 from the outside in the radial direction. A lower tubular portion 41b that surrounds the seal protrusion 7 from the outside in the radial direction is provided.

The upper tubular portion 41a projects upward from the mouth portion 4a of the container body 4. A protruding wall portion 48 projecting inward in the radial direction is formed in a portion of the upper tubular portion 41a located above the mouth portion 4a of the container body 4. In the illustrated example, the protruding wall portion 48 is arranged above the female screw portion 11 described later, and is formed in an annular shape over the entire circumference of the upper tubular portion 41a. Therefore, the lower surface of the protruding wall portion 48 is an annular contact surface 48a that faces the flange portion 2b of the inner container 2 from above and is in contact with the contact surface 2c of the flange portion 2b from above.
It should be noted that the protruding wall portions 48 do not have to be formed in an annular shape, for example, a plurality of protruding wall portions 48 are arranged at intervals in the circumferential direction, and are formed in a plurality of protruding rib shapes protruding inward in the radial direction. It doesn't matter.

As a result, the discharge cap 5 is positioned in the vertical position with respect to the mouth portion 4a of the container body 4, and excessive tightening of the container body 4 with respect to the mouth portion 4a is suppressed, so that the discharge cap 5 is positioned at an appropriate tightening position. It is screwed in.

Then, the outer peripheral edge portion of the outer base portion 25 of the inner plug portion 20 is fitted inside the protruding wall portion 48. Further, a female screw portion (second screw portion) 11 to be screwed into the male screw portion 10 of the outer container 3 is formed on the inner peripheral surface of the portion of the upper tubular portion 41a that surrounds the mouth portion 4a of the container body 4.
A ventilation groove (not shown) extending in the vertical direction may be formed on the inner peripheral surface of the upper cylinder portion 41a so as to vertically traverse the female screw portion 11 so as to guide the outside air to the intake hole 6 through the ventilation groove. No.

The lower tubular portion 41b is tightly fitted to the outer peripheral surface of the seal protrusion 7. As a result, the seal protrusion 7 and the lower cylinder portion 41b are tightly sealed. Therefore, the intake hole 6 is prevented from communicating with the outside of the double container 1 through the seal protrusion 7 and the mounting cylinder 41. Therefore, the seal protrusion 7 is located below the intake hole 6 and functions as a seal portion that seals between the seal protrusion 7 and the mounting cylinder 41.

At the central portion of the top wall portion 42, a discharge cylinder portion 43 projecting upward is formed coaxially with the container shaft O. The inside of the discharge cylinder portion 43 is a discharge hole 44 that penetrates the top wall portion 42 up and down and communicates with the inside of the inner container 2 through the flow hole 33. The discharge cylinder portion 43 is formed so that the diameter of the discharge cylinder portion 43 is gradually increased as the upper end portion side is directed upward.

Further, in the top wall portion 42, the inner hanging cylinder portion 45 is provided in the radial direction with a gap between the inner hanging cylinder portion 45 formed so as to project downward and the inner hanging cylinder portion 45. An outer hanging cylinder portion 46 surrounding the outside of the above is formed.
The inner hanging cylinder portion 45 is formed so as to be located above the inner cylinder portion 28 in the inner plug portion 20, and the outer hanging cylinder portion 46 is formed so as to be located above the outer cylinder portion 27 in the inner plug portion 20. Has been done. The portion surrounded by the inner hanging cylinder portion 45 and the outer hanging cylinder portion 46 is an annular space that opens downward.

Further, an outside air introduction hole 47 that vertically penetrates the top wall portion 42 is formed in a portion of the top wall portion 42 located outside the outer hanging cylinder portion 46 in the radial direction. The outside air introduction holes 47 are not limited to one place, and a plurality of outside air introduction holes 47 may be formed at intervals in the circumferential direction.

A discharge valve 70 and an outside air introduction valve (air valve) 80 are arranged between the inner plug portion 20 configured as described above and the top wall portion 42 of the cap body 40.

The discharge valve 70 is a valve that switches between communication and shutoff between the discharge hole 44 and the inside of the container body 4, and is a valve body 71 mounted on the upper surface of the inner base portion 26 so as to be detachable, a valve body 71, and an outside air introduction valve. It is a multi-point valve (for example, a 3-point valve) including a plurality of (for example, 3) elastic arms 72 that integrally connect the tubular body portion 81 described later of the 80.

The valve body 71 is formed, for example, in a circular shape in a plan view, and the flow hole 33 formed in the inner base portion 26 is closed so as to be openable. The valve body 71 does not completely close the upper opening of the accommodating cylinder 22. Therefore, the inside of the accommodating cylinder 22 is always open upward.

The elastic arm 72 is formed so as to extend in the circumferential direction, for example, to ensure appropriate springiness, the inner end portion is connected to the outer edge portion of the valve body 71, and the outer end portion is a tubular body portion. It is connected to 81. Then, when the internal pressure of the inner container 2 rises due to the squeeze deformation of the outer container 3, the elastic arm 72 is elastically deformed so as to move the valve body 71 upward, and the valve body 71 is elastically deformed so as to move the valve body 71 upward. Separate from. As a result, when the outer container 3 is deformed by squeeze, the flow hole 33 is opened so that the discharge hole 44 and the inside of the container body 4 communicate with each other, and the contents can be circulated to the discharge hole 44 side. ..

The discharge valve 70 may have a valve structure other than the above configuration, as long as the flow hole 33 can be opened when the outer container 3 is deformed by squeeze play.

The outside air introduction valve 80 is fitted in an annular space whose lower end is formed between the outer cylinder 27 and the inner cylinder 28 formed in the base 21, and the upper end is formed in the top wall 42. A tubular body 81 fitted in an annular space formed between the inner hanging tubular portion 45 and the outer hanging tubular portion 46, and an annular shape from the outer peripheral surface of the tubular body portion 81 toward the outside in the radial direction. It is provided with an elastically deformable valve body 82 that is projected and has an outer end as a free end.

The outer end of the valve body 82 is in contact with the lower surface of the top wall portion 42 so as to be detachable from below over the entire circumference. As a result, the outside air introduction valve 80 closes the outside air introduction hole 47 so as to be open from the inside of the cap body 40. That is, the valve body 82 is a check valve that allows the inflow of outside air from the outside through the outside air introduction hole 47 and regulates the outflow of outside air to the outside through the outside air introduction hole 47 when the outer container 3 is squeeze deformed. Function.
The outside air that has flowed in from the outside through the outside air introduction hole 47 passes through the air hole 31 and the ventilation passage 8 as shown by the arrow in FIG. It flows into the outer container 3.

The lid portion 50 is formed in a climax cylinder shape by the peripheral wall portion 51 and the top wall portion 52, and is detachably fitted to the upper end portion of the mounting cylinder portion 41 in the cap body 40.
On the top wall portion 52, a plug body 53 projecting downward is formed coaxially with the container shaft O. The plug body 53 is detachably fitted inside the discharge cylinder portion 43 by being inserted into the discharge cylinder portion 43 from above. As a result, the plug body 53 regulates the discharge of the contents through the discharge hole 44.

The peripheral wall portion 51 is connected to the mounting cylinder portion 41 via a hinge portion 54. As a result, the lid portion 50 can be rotated around the hinge portion 54, and the plug body 53 can be inserted and removed from the discharge cylinder portion 43 as the lid portion 50 rotates, and the discharge hole 44 can be opened and closed. There is.
The peripheral wall portion 51 is formed with an operating projecting piece 55 so as to project outward in the radial direction from a portion located on the side opposite to the hinge portion 54 with the container shaft O interposed therebetween. As a result, it is possible to easily perform the rotation operation of the lid portion 50 by using the operation projecting piece 55.

(Action of double container)
A case where the double container 1 configured as described above is used will be described.
When discharging the contents, the lid portion 50 of the discharge cap 5 shown in FIG. 1 is rotated around the hinge portion 54 to open the discharge hole 44 as shown in FIG. 2, and then, for example, the container body 4 Is tilted or turned upside down to squeeze (elastically deform) the outer container 3 of the container body 4 inward in the radial direction. As a result, the inner container 2 is deformed inward in the radial direction together with the outer container 3 to reduce the volume, so that the internal pressure of the inner container 2 rises.

Then, the valve body 71 of the discharge valve 70 separates upward from the upper surface of the inner base portion 26, so that the discharge hole 44 and the inside of the inner container 2 communicate with each other through the flow hole 33. As a result, the contents contained in the inner container 2 can be discharged to the outside through the discharge hole 44. At this time, the valve body portion 23 in the accommodating cylinder portion 22 moves toward the valve body 71 side as shown by the dotted line shown in FIG.

After that, when the increase in the internal pressure of the inner container 2 is stopped or decreased by stopping or releasing the squeeze deformation of the container body 4, the valve body 71 of the discharge valve 70 returns to the original state by the restoration deformation of the elastic arm 72. It sits on the upper surface of the inner base portion 26. As a result, the flow hole 33 can be closed again, and the communication between the discharge hole 44 and the inside of the inner container 2 is cut off. Therefore, the discharge of the contents can be stopped.

Further, by releasing the squeeze deformation of the container body 4, the outer container 3 starts to be restored and deformed while maintaining the volume reduction state of the inner container 2, so that a negative pressure is generated between the outer container 3 and the inner container 2. .. Then, since this negative pressure acts on the outside air introduction valve 80 through the intake hole 6, the outer end portion of the valve body 82 is separated downward from the lower surface of the top wall portion 42, and the outside air introduction hole 47 is opened. As a result, the outside air flows in from the outside through the outside air introduction hole 47, the air hole 31, and the ventilation passage 8, and flows in between the inner container 2 and the outer container 3 through the intake hole 6.
As a result, even if the outer container 3 is restored and deformed, the inner container 2 can be separated from the inner surface of the outer container 3 and kept in a state of being volume-reduced and deformed. Therefore, the contents can be discharged while gradually reducing and deforming the inner container 2.

Further, by returning the container body 4 to the upright posture in accordance with the release of the squeeze deformation of the container body 4, the valve body portion 23 in the accommodating cylinder portion 22 is moved to the diameter reduction portion 22a side by its own weight, and the contraction thereof is performed. It can be seated on the diameter portion 22a. It is possible to move the valve body portion 23 to the reduced diameter portion 22a side not only by its own weight but also by the negative pressure generated by the restoring force of the inner container 2.
Then, even if the contents remain between the discharge cylinder portion 43 and the inner base portion 26 due to the suckback effect accompanying the movement of the valve body portion 23, the remaining contents are drawn into the accommodating cylinder portion 22. Can be done. Therefore, the residual content is unlikely to leak to the outside through the discharge hole 44, and dripping can be prevented.

Since it is also possible to move the valve body portion 23 in the accommodating cylinder portion 22 toward the valve body 71 side by utilizing the increase in the internal pressure of the inner container 2, the container body 4 is not necessarily tilted or tilted when the contents are discharged. There is no need to turn it upside down.

In particular, according to the double container 1 of the present embodiment, the discharge cap 5 can be easily attached to the mouth 4a of the container body 4 by a simple operation of simply tightening the discharge cap 5 into the mouth 4a of the container body 4 at the time of manufacturing. Can be attached to.
At this time, when the tightening end of the discharge cap 5 is reached, the contacted surface 48a of the protruding wall portion 48 of the mounting cylinder portion 41 comes into contact with the contact surface 2c of the flange portion 2b of the inner container 2 from above. As a result, the vertical position of the discharge cap 5 with respect to the mouth portion 4a of the container body 4 can be positioned, and the tightening position of the discharge cap 5 can be positioned by suppressing further tightening operations.

Therefore, since deformation or the like due to excessive tightening does not occur in the mouth portion 4a of the container body 4 or the mounting cylinder portion 41, the seal protrusion 7 is used to securely seal the container body 4 with the mounting cylinder portion 41. This makes it possible to prevent the intake hole 6 from communicating with the outside at an unintended location. Therefore, as described above, after the contents are discharged, the outside air can be surely introduced between the inner container 2 and the outer container 3 through the ventilation passage 8 and the intake hole 6.

In addition, since it is possible to prevent the intake hole 6 from communicating with the outside at an unintended location, the air (outside air) taken in between the inner container 2 and the outer container 3 leaks to the outside during use. Can be suppressed. Therefore, the air taken in between the inner container 2 and the outer container 3 can be appropriately present, and when the outer container 3 is pressed inward in the radial direction, the pressing force applied to the outer container 3 is applied to the air. It can be appropriately transmitted to the inner container 2 via the layer. As a result, the inner container 2 can be pressed, and the discharge valve 70 can be opened responsively and smoothly. As a result, the double container 1 exhibiting a stable discharge function can be obtained.

Further, even if the remaining amount of the contents is low, the pressing force applied to the outer container 3 can be efficiently transmitted to the inner container 2 through the air layer existing between the inner container 2 and the outer container 3. Therefore, it is not necessary to press the outer container 3 with a large pressing force, and the discharge operability can be improved.

As described above, according to the double container 1 of the present embodiment, the discharge cap 5 can be attached to the container body 4 in an appropriate positional relationship while suppressing excessive tightening. Therefore, it is possible to prevent the air (outside air) taken in between the inner container 2 and the outer container 3 from leaking to the outside, so that a stable discharge function can be exhibited and the discharge operability is improved. It can be a double container 1.

Further, at the time of manufacturing the double container 1, the protruding wall portion is provided with the discharge valve 70 arranged between the discharge cap 5 and the top wall portion 42 before the discharge cap 5 is screwed to the mouth portion 4a of the container body 4. By fitting the inner plug portion 20 inside the 48, the discharge valve 70, the inner plug portion 20, and the discharge cap 5 can be integrally combined and handled as one unit. Therefore, the double container 1 can be efficiently manufactured by screwing the discharge cap 5 to the mouth portion 4a of the container body 4.
Although the discharge valve 70 and the outside air introduction valve 80 are integrally formed, these may be used as separate members.

Further, as described above, the container body 4 of the present embodiment is biaxially stretched blow molded after the preform for the outer container 3 and the preform for the inner container 2 formed by injection molding are doubly combined. In addition, the preform for the outer container 3 and the preform for the inner container 2 are both made of PET resin.
Therefore, the rigidity of the mouth portion 4a of the container body 4 is set higher than the rigidity of the mounting cylinder portion 41 of the discharge cap 5 molded of, for example, polyethylene or polypropylene.

In particular, the mouth portion 3a of the outer container 3 on which the male screw portion 10 is formed is formed by biaxial stretching blow molding using the preform for the outer container 3, and therefore, as shown in FIG. 1, the outer container is formed. The inner surface of the mouth portion 3a of No. 3 is not a concavo-convex surface that is concavo-convex corresponding to the shape of the male screw portion 10, but is a flat flat surface. Therefore, the thickness of the mouth portion 3a of the outer container 3 can be sufficiently secured to obtain a certain rigidity, and deformation such as buckling is unlikely to occur.

Since the rigidity of the mouth portion 4a of the container body 4 is high as described above, the discharge cap 5 can be easily attached to the mouth portion 4a of the container body 4, and the manufacturing efficiency can be improved.
When the rigidity of the mouth portion 4a of the container body 4 is higher than that of the mounting cylinder portion 41, when the discharge cap 5 is excessively tightened, for example, the lower end portion of the mounting cylinder portion 41 is radially outside. It is easy to induce deformation that spreads.
However, in the double container 1 of the present embodiment, the protruding wall portion 48 and the contact surface 2c can be used to suppress an excessive tightening operation of the discharge cap 5, so that while suppressing deformation of the mounting cylinder portion 41 and the like. The discharge cap 5 can be properly attached.

(Second Embodiment)
Next, a second embodiment of the double container according to the present invention will be described. In the second embodiment, the same parts as the components in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.
In the first embodiment, the protruding wall portion 48 is brought into contact with the upper surface of the flange portion 2b of the inner container 2, but in the present embodiment, the protruding wall portion 48 is brought into contact with the upper end portion of the outer container 3. doing.

As shown in FIG. 3, in the double container 90 of the present embodiment, the flange portion 2b of the inner container 2 closes a part of the upper end opening end of the mouth portion 3a of the outer container 3 from the upper side. As a result, at least the portion of the upper end opening end of the mouth portion 3a of the outer container 3 located on the outer side in the radial direction with respect to the flange portion 2b faces the contacted surface 48a of the protruding wall portion 48 from below, and the cover is covered. It functions as a contact surface 3b that comes into contact with the contact surface 48a from below.
As a result, the vertical position of the discharge cap 5 with respect to the mouth portion 4a of the container body 4 can be positioned by the contact between the protruding wall portion 48 and the contact surface 3b of the outer container 3.

Further, in the flange portion 2b of the inner container 2 of the present embodiment, a vertical groove-shaped first ventilation passage 91 that penetrates the flange portion 2b in the vertical direction and opens to the outer peripheral edge portion side of the collar portion 2b surrounds the flange portion 2b. Multiple pieces are formed at intervals in the direction. The first ventilation passage 91 is formed so as to coincide with the position in the circumferential direction with respect to the air hole 31, and communicates with the air hole 31.

Further, at the upper end portion of the outer container 3, a plurality of lateral groove-shaped second air passages 92 extending in the radial direction in a state of being recessed downward from the contact surface 3b are formed at intervals in the circumferential direction. The second air passage 92 is formed so as to penetrate the mouth portion 3a of the outer container 3 in the radial direction, and is formed so as to coincide with the position in the circumferential direction with respect to the first air passage 91. It communicates with the air passage 91.
A plurality of vertical groove-shaped third ventilation passages 93 communicating with the second ventilation passage 92 are formed on the outer peripheral surface of the upper end portion of the outer container 3 at intervals in the circumferential direction.
The upper end of the inner container 2 is built in the upper end of the outer container 3. Therefore, in the second air passage 92 formed on the outer container 3 side, the opening toward the inside in the radial direction is closed by the upper end portion of the inner container 2.

The first air passage 91, the second air passage 92, and the third air passage 93 described above allow outside air to flow into the intake hole 6 side through the protrusion wall portion 48 and the contact surface 3b of the mouth portion 3a of the outer container 3. Functions as a ventilation path 94 that allows.

Even with the double container 90 configured as described above, the same effects as those of the first embodiment can be achieved.

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 embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. The embodiments and modifications thereof include, for example, those that can be easily assumed by those skilled in the art, those that are substantially the same, those that have an equal range, and the like.

For example, in each of the above embodiments, as the double container, the inner container is a laminated peelable container in which the inner container is detachably laminated on the inner surface of the outer container, but the present invention is not limited to this, and the inner container and the outer container are used. It may be a double container in which a gap is secured between the two containers.

Further, the outside air introduction valve is not essential in each of the above embodiments and may not be provided. In this case, for example, when the opening size of the outside air introduction hole, the air hole or the intake hole is reduced to squeeze the outer container, the air between the outer container and the inner container is unlikely to flow out to the outside. It may be configured so as to be.

Further, in each of the above embodiments, the case where the intake hole is formed in the mouth of the outer container has been described as an example, but the present invention is not limited to this case. For example, a vertical groove is formed between the mouth of the inner container and the mouth of the outer container, and the vertical groove and the outside are formed between the upper end of the mouth of the outer container and the flange of the mouth of the inner container. By forming a lateral groove that communicates with, it may function as an intake hole.
In any case, it suffices if an intake hole is formed at the mouth of the container body.

Further, in each of the above embodiments, the case where the ventilation path is formed on the mouth side of the container body has been described as an example, but the present invention is not limited to this case, and is not limited to, for example, the mouth side of the container body. A ventilation path may be formed on the protruding wall side, or a ventilation path may be formed on both the mouth portion and the protruding wall portion of the container body. When the ventilation path is formed in the protruding wall portion, it can be formed on the contacted surface which is the inner peripheral surface or the lower surface of the protruding wall portion, for example.

1, 90 ... Double container 2 ... Inner container 2c, 3b ... Contact surface 3 ... Outer container 4 ... Container body 4a ... Container body mouth 5 ... Discharge cap 6 ... Intake hole 7 ... Seal protrusion (seal part)
8, 94 ... Ventilation path 10 ... Male threaded part (first threaded part)
11 ... Female threaded portion (second threaded portion)
20 ... Inner plug 33 ... Distribution hole 41 ... Mounting cylinder 42 ... Top wall 44 ... Discharge hole 48 ... Protruding wall 70 ... Discharge valve

Claims (3)

An inner container that contains the contents and whose volume is reduced and deformed as the contents decrease, and a container body including an outer container in which the inner container is housed.
A discharge cap having a top wall portion screwed to the mouth portion of the container body and formed with a discharge hole for the contents is provided.
A first screw portion is formed at the mouth of the container body, and an intake hole for introducing outside air is formed between the outer container and the inner container.
The discharge cap includes a mounting cylinder portion that surrounds the mouth portion of the container body from the outside in the radial direction and has a second screw portion that is screwed to the first screw portion, and the discharge hole and the inside of the container body. Equipped with a discharge valve that switches between communication and shutoff,
The mouth portion of the container body is provided with a seal portion that is located below the intake hole and that seals between the container body and the mounting cylinder portion.
The mounting cylinder portion is formed with a protruding wall portion that projects inward in the radial direction and is located above the second screw portion.
The upper end of the mouth portion of the container body is provided with a contact surface that contacts the protruding wall portion from below to position the vertical position of the discharge cap with respect to the mouth portion of the container body.
At least one of the protruding wall portion and the mouth portion of the container body is formed with a ventilation path that allows the inflow of outside air to the intake hole side through between the protruding wall portion and the contact surface. A double container characterized by being. In the double container according to claim 1,
A flow hole for communicating the inside of the container body and the discharge hole is formed, and an inner plug portion for closing the mouth portion of the container body is provided.
The inner plug portion is fitted inside the protruding wall portion so as to be integrally combined with the discharge cap.
The discharge valve is a double container arranged between the inner plug portion and the top wall portion. In the double container according to claim 1 or 2.
A double container in which the rigidity of the mouth portion of the container body is higher than the rigidity of the mounting cylinder portion.

Images