JP7294842B2 - Composite cap for double structure container - Google Patents

Description

TECHNICAL FIELD The present invention relates to a composite cap for a double-structured container, which is used by being attached to a double-structured container comprising an outer cylindrical container and an inner bag container inserted and held in the outer cylindrical container.

2. Description of the Related Art Conventionally, a double structure container having a double structure consisting of an inner bag container and an outer cylindrical container has been put into practical use, for example, as an airless bottle for containing seasoning liquid such as soy sauce. Such an airless bottle is used in combination with a composite cap with a check valve, and is filled into the inner bag container by squeezing the body wall of the bottle, which is the outer cylindrical container, to dent it from the outside. The contained liquid is discharged from the pouring passage formed in the cap, and when the discharge of the liquid content is completed by stopping the pressing of the body wall of the bottle, the air is allowed to flow into the inner bag container by the action of the check valve. is not introduced, and is introduced into the space between the inner bag container and the outer cylindrical container through a channel different from the extraction channel of the cap. As a result, the inner bag container shrinks by the amount of the content liquid discharged, and the inner bag container contracts each time the content liquid is discharged. In an airless bottle in which the content liquid is discharged by such a method, the content liquid can be dispensed and the intrusion of air into the inner bag container filled with the content liquid is effectively prevented. can be effectively avoided, and the freshness of the content liquid can be maintained for a long period of time.

By the way, in the composite cap with a check valve as described above, a check valve is provided to prevent the inflow of air into the inner bag container while allowing the content liquid to be discharged from the inner bag container. A valve function is required in addition to a non-return valve. That is, in the double-structured container, when the body of the outer cylindrical container is pressed, the body of the inner bag container is pressed, and the liquid contained in the inner bag container is discharged. After discharging a certain amount of the liquid in this manner, the body of the outer cylindrical container returns to its original shape, and along with this, the space between the body of the inner bag container and the body of the outer cylindrical container ( hereinafter referred to as working space) is in a decompressed state, air flows into the working space, and the working space returns to normal pressure. At this time, if air does not flow in and the working space remains in a decompressed state, even if the body of the outer cylindrical container is pressed thereafter, the body of the inner bag container will not be sufficiently pressed, and the inner bag container will not be pressed sufficiently. Most of the liquid inside will not be discharged. In addition, the body of the outer cylindrical container also quickly returns to its original shape, and when the pressing of the body of the outer cylindrical container is stopped, it is necessary to introduce air into the working space at the same time that the body returns to its original shape. That's why.

As a composite cap container having a valve function different from the check valve as described above, for example, Patent Document 1 discloses a compound cap that is attached to the neck of the outer cylindrical container. It has been proposed that an inwardly protruding flexible sealing piece is provided so as to be in close contact with the upper surface of a jaw formed on the outer surface of the. That is, an air inlet for introducing air into a space (working space) between the body of the inner bag container and the body of the outer cylindrical container is provided above the jaw of the neck of the outer cylindrical container. so that the flexible sealing piece described above functions as an air valve. For example, when the body of the outer cylindrical container is pressed, the seal piece is in close contact with the upper surface of the jaw, thereby preventing the air in the working space from being discharged from the air inlet. When the pressing of the barrel of the outer cylindrical container is stopped and the pressure of the working space becomes negative due to the return of the barrel to its original shape, the seal piece is bent upward to create a gap between the upper surface of the jaw and the seal piece. Air is introduced into the working space from the outside through the air gap through the air inlet.

However, when the inwardly protruding flexible seal piece is used as an air valve as described above, the portion forming the seal piece is forcibly removed when molding the cap. There is a problem that it is easily damaged. In order to avoid this, the length of the inward projection of the seal piece may be shortened, but in this case, the function as a valve may be impaired. In addition, it is necessary to provide a space in the mold for forming the above-mentioned seal piece, and for this reason, there is also the problem that the shape of the mold becomes complicated.

Japanese Patent Application Laid-Open No. 2018-2198

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a composite cap for a double-structured container which is used by being attached to a double-structured container, and which has a simple shape that effectively prevents breakage of the sealing piece due to forced extraction during molding. An object of the present invention is to provide a composite cap with a member.

According to the present invention, in a composite cap provided in a double-structured container comprising an inner bag container in which contents are contained and an outer cylindrical container provided so as to cover the inner bag container,
The composite cap has a top plate, a cap body consisting of a cylindrical side wall that hangs down from the periphery of the top plate and is fitted to the neck of the outer cylindrical container, and a check valve. On the upper surface of the portion, a guide cylinder for pouring out the contents is erected and communicated with the hollow space in the cylindrical side wall. With the ring hanging down,
On the lower surface of the top plate portion, between the cylindrical side wall and the inner ring, air is taken into the space due to pressure fluctuations in the space between the inner bag container and the outer cylindrical container, or the space is filled with air. An annular hanging flap piece that functions as an air valve for preventing air discharge from the cap is provided so as to extend in the axial direction of the cap ,
The annular hanging flap piece abuts on the inner surface of the neck portion of the outer cylindrical container, and functions as an air valve by detachment from and contact with the inner surface of the neck portion,
There is provided a composite cap for a double structure container, wherein the annular hanging flap piece functions by coming into contact with an inclined surface formed on the upper end of the inner surface of the neck portion of the outer cylindrical container.
According to the present invention, there is also provided a composite cap provided on a double-structured container comprising an inner bag container in which contents are contained and an outer cylindrical container provided so as to cover the inner bag container,
The composite cap has a top plate, a cap body consisting of a cylindrical side wall that hangs down from the periphery of the top plate and is fitted to the neck of the outer cylindrical container, and a check valve. On the upper surface of the portion, a guide cylinder for pouring out the contents is erected and communicated with the hollow space in the cylindrical side wall. With the ring hanging down,
On the lower surface of the top plate portion, between the cylindrical side wall and the inner ring, air is taken into the space due to pressure fluctuations in the space between the inner bag container and the outer cylindrical container, or the space is filled with air. An annular hanging flap piece that functions as an air valve for preventing air discharge from the cap is provided so as to extend in the axial direction of the cap,
The annular hanging flap piece hangs down from the lower surface of the top plate portion at a distance from the inner surface of the cylindrical side wall, and the space between the annular hanging flap piece, the top plate portion, and the cylindrical side wall has a , a composite cap for a double structure container is provided, wherein the neck of the outer cylindrical container is fitted.
According to the present invention, there is further provided a composite cap provided on a double-structured container comprising an inner bag container in which contents are contained and an outer cylindrical container provided so as to cover the inner bag container,
The composite cap has a top plate, a cap body consisting of a cylindrical side wall that hangs down from the periphery of the top plate and is fitted to the neck of the outer cylindrical container, and a check valve. On the upper surface of the portion, a guide cylinder for pouring out the contents is erected and communicated with the hollow space in the cylindrical side wall. With the ring hanging down,
On the lower surface of the top plate portion, between the cylindrical side wall and the inner ring, air is taken into the space due to pressure fluctuations in the space between the inner bag container and the outer cylindrical container, or the space is filled with air. An annular hanging flap piece that functions as an air valve for preventing air discharge from the cap is provided so as to extend in the axial direction of the cap,
An inner plug is provided in a region surrounded by the inner ring on the lower surface of the top plate portion, and the inner plug is formed with an opening that allows communication between the inside of the content liquid pouring guide tube and the inside of the inner bag container. is,
An inner plug retaining ring extends from the lower surface of the top plate portion, and the inner plug is retained by the inner plug retaining ring.
According to the present invention, there is further provided a package comprising the composite cap for a double structure container and a double structure container to which the composite cap is attached.

The following aspects are preferably applied to the composite cap for a double structure container of the present invention .
(1 ) The annular hanging flap piece is provided with a narrow groove that secures a flow path for discharging air when the pressure in the space between the inner bag container and the outer cylindrical container increases due to environmental changes. to be
(2 ) The composite cap has an upper lid that can open and close the top plate portion, and the inner plug is provided with the check valve that can open and close the opening of the inner plug, The top cover is provided with a pole for urging the check valve to close the opening when the top cover is closed. It should function as an air valve by detachment and contact.

The composite cap of the present invention is used by being attached to a double-structured container consisting of an outer cylindrical container and an inner bag container inserted into the outer cylindrical container and containing a content liquid. , the cap has an axially extending annular depending flap piece as an air valve.
That is, the annular hanging flap piece is a flexible member that can swing inwardly and outwardly of the cap. Therefore, when the body of the outer cylindrical container is pressed to discharge the content liquid, the pressure in the space (action space) between the outer cylindrical container and the inner bag container is greatly increased. moves outward to a large extent, strongly adheres to the inner surface of the outer cylindrical container, prevents air from being discharged from this working space, and presses the body of the outer cylindrical container to be accommodated in the inner bag container. The content liquid can be quickly discharged.
In addition, when the pressing of the body of the outer cylindrical container is stopped, the body of the outer cylindrical container returns to its original shape, and the working space is decompressed, the annular hanging flap piece moves inward and the annular hanging flap moves inward. A gap is formed between the strip and the inner surface of the outer envelope, which gap forms an air passage between the outside and the working space. Air is introduced into the working space through the air passage formed in this manner, whereby the pressure in the working space is restored to normal pressure, and the next content liquid discharge operation can be performed.

Since such a flexible annular hanging flap piece extends in the axial direction of the cap, there is no need to forcibly remove the cap when forming the cap, and damage due to such forcible removal is effectively prevented. Further, in order to form such an annular hanging flap piece, there is no need to form a recess or the like in the mold, nor to use a mold with a special shape.

Furthermore, when an inwardly inclined surface is formed on the upper end of the inner surface of the neck portion of the outer cylindrical container, the inclined surface can be used to enhance the air valve function of the annular hanging flap piece. That is, in the normal state where the composite cap is attached to the double structure container, the lower end of the annular hanging flap piece is formed to abut against the inner surface of the outer cylindrical container. If provided so as to abut against this inclined surface, when the barrel of the outer cylindrical container is greatly recessed by the squeeze operation during pouring out the content liquid, the pressure in the working space increases greatly, and the annular hanging flap piece moves outward ( Since it flexes greatly in the upward direction of the inclined surface and strongly adheres to the inclined surface, air does not flow from between the annular hanging flap piece and the inclined surface to the outside, and the air path connecting the working space and the outside is blocked. It becomes possible.
After that, when the squeezing operation state is released, the working space becomes decompressed, and the annular hanging flap pieces flex inwardly (in the direction of descending the inclined surface) so as to separate, forming an air passage, so that air can flow easily into the working space. can be introduced into
Furthermore, by forming the thin grooves on the outer surface of the annular hanging flap piece, when the pressure in the working space rises slightly due to, for example, a change in the environmental temperature, the annular hanging flap piece does not bend outward and the narrow groove Since the air is exhausted from the opening, the internal pressure in the working space does not rise excessively.
That is, in a state where the internal pressure of the working space is excessively increased due to changes in the environmental temperature, the content liquid can be released when the top lid provided on the composite cap is opened without squeezing the body of the outer cylindrical container. However, as described above, by providing a narrow groove on the outer surface of the annular hanging flap piece, gas is released from the working space when the temperature rises due to environmental changes. It is possible to effectively prevent the discharge of the content liquid when it cannot be obtained.

The figure which shows the schematic structure of the double structure container to which the composite cap of this invention is applied. Fig. 2 is a side cross-sectional view showing a state in which the composite cap of the present invention is attached to the neck of a double structure container; FIG. 3 is a side cross-sectional view showing the cap body in the composite cap of FIG. 2 with the top lid opened. FIG. 4 is a bottom view of the cap body of FIG. 3; FIG. 4 is a top view of the cap body of FIG. 3; FIG. 3 is a partially enlarged sectional side view for explaining the function of the annular hanging flap piece in the composite cap of FIG. 2;

First, prior to describing the structure of the composite cap of the present invention, a brief description will be given of a double structure container to which this composite cap is attached.

Referring to FIG. 1 showing the schematic structure of this double-structured container, the double-structured container indicated as a whole by 1 consists of a bottle-shaped outer cylindrical container 3 and an inner bag container 5 for containing a liquid such as soy sauce. As understood from FIG. 1, the inner bag container 5 is inserted and held inside the outer cylindrical container 3 .

The outer cylindrical container 3 has a neck portion 3a, a shoulder portion 3b connected to the neck portion 3a and expanding in diameter downward, and a body portion 3c connected to the shoulder portion 3b. is closed by a bottom 3d. A support ring 3e is formed on the outer surface of the neck portion 3a of the outer tubular container 3 as described above. A composite cap of the present invention, which will be described later, is fitted and fixed to a portion above the support ring 3e of the neck portion 3a.

On the other hand, the inner bag container 5 in which the liquid is contained is composed of a neck portion 5a and a deformable bag-like portion 5b connected to the neck portion 5a. The neck portion 5a of the inner bag container 5 is positioned within the neck portion 3a of the outer cylindrical container 3, and a space (working space) is provided between the bag-like portion 5b of the inner bag container 5 and the outer cylindrical container 3. X is formed.

The double structure container 1 having such a configuration is generally manufactured by a preform-in-bottle method or a stack preform method using stretch blow molding.

In the preform-in-bottle method, an outer cylindrical container 3 is formed in advance by known stretch blow molding, and a test tube-shaped inner bag preform having a neck portion 5a is placed in the outer cylindrical container 3. In this method, the inner bag preform is inserted and a blow fluid is supplied into the inner bag preform in this state to carry out blow molding. In this method, the outer cylindrical container 3 functions as a blow mold, and the portion below the neck portion 5a of the inner bag preform is shaped into the form of the bag-like portion 5b. That is, in this method, the stretch blow molding of the outer cylindrical container 3 and the stretch blow molding of the inner bag container 5 are sequentially performed.

In the stack preform method, an outer cylindrical container forming preform having a neck portion 3a and an inner bag preform having a neck portion 5a are formed by injection molding, respectively, and the inner bag preform is formed into an outer cylindrical container forming preform. A stack preform is formed by inserting a preform for molding an outer cylindrical container and a preform for an inner bag into a preform. In this technique, a blow fluid is supplied into the preform for stretch blow molding. In other words, in this method, the preform for molding the outer cylindrical container is formed into the shape of the container by the expansion of the preform for the inner bag. Stretch blow molding is performed at the same time.

Regardless of which method is used to manufacture the outer cylindrical container 3, the shoulder portion 3b, the body portion 3c and the bottom portion 3d, except for the neck portion 3a, are formed by stretching. The outer surface of the bag-like portion 5b of the inner bag container 5 is in close contact with the inner surface of the body portion 3c of the outer cylindrical container 3 at the stage immediately after manufacturing. It is in.

Therefore, the outer cylindrical container 3 and the inner bag container 5 as described above are molded using blow-moldable thermoplastic resins, such as polyesters such as polyethylene terephthalate, and polyolefins such as polyethylene and polypropylene.

That is, in the double structure container as described above, by pressing (squeezing) the body portion 3c of the outer cylindrical container 3, the bag-like portion 5b of the inner bag container 5 is pressed as the body portion 3c is dented. As a result, the liquid contained in the bag-like portion 5b of the inner bag container 5 is discharged. When the liquid content is discharged, the bag-like portion 5b contracts according to the raw material of the liquid content, and the body portion 3c of the outer cylindrical container 3 returns to its original shape due to its elasticity. When such a discharge operation is repeatedly performed, if the air in the action space X is discharged when squeezing the body portion 3c, the bag-like portion 5b is locally pressed. There is no problem when the bag-like portion 5b is filled with the liquid content, but as the amount of the liquid content decreases, it becomes difficult to effectively discharge the liquid content. Therefore, when the body portion 3c is pressed to discharge the content liquid, the air in the action space X is not discharged, and an air layer exists between the body portion 3c and the bag-like portion 5b. It is necessary that the bag-like portion 5b is pressed through the hole.

Further, when the content liquid is discharged, the volume of the bag-like portion 5b is reduced by the amount of the content liquid discharged, and the body portion 3c returns from the dented state. becomes. Therefore, after the content liquid is discharged, it is necessary to introduce air into the action space X to return the inside of the action space X to normal pressure. If the pressure remains negative, not only will the barrel 3c not return to its original shape smoothly, but the barrel 3c must be greatly recessed when the content liquid is to be discharged by pressing the barrel 3c. Otherwise, it becomes difficult to effectively discharge the content liquid.

Furthermore, the discharge of the content liquid as described above is performed with the upper lid of the composite cap, which will be described later, opened. When the container is closed, the liquid inside the bag-like portion 5b may be discharged even though the body portion 3c is not pressed. Therefore, when the pressure in the working space X rises due to a change in the environmental temperature, it is desired that the pressure inside the working space X is maintained at normal pressure by venting the gas.

Therefore, it is required to prevent the air from being discharged from the working space X, to introduce air into the space X as appropriate, and to perform gas venting as appropriate. The composite cap of the present invention has a valve function that satisfies such requirements.

The structure of the composite cap of the present invention will be described in detail below together with the configuration of the necks 3a and 5a of the double structure container 1 to which this composite cap is attached.

Referring to FIG. 2 together with FIG. 1 described above, an undercut 3f is formed on the outer surface of the upper end portion of the neck portion 3a of the outer cylindrical container 3, and engagement with this undercut 3f will be described later. A composite cap is attached and held steady. In addition, the undercut 3f is partially cut out so that an air passage from the working space X to the outside is formed along the inner surface, the upper end surface, and the outer surface of the neck portion 3a (see FIG. 6, which will be described later). The notch in this part is indicated by 3f'). In addition, the inner surface of the neck portion 3a may be an upright straight surface. It is preferable that the inclined surface Y is inclined inwardly and downwardly. A step 3g is formed in the upper portion of the inner surface of the neck portion 3a of the outer cylindrical container 3, and a small projection 3h is formed slightly above the step 3g.

A small flange 5c protruding outward is formed at the upper end of the neck portion 5a of the inner bag container 5 positioned within the neck portion 3a. This small flange 5c is formed to firmly grip the preform with a jig during blow molding. Further, a circumferential projection 5d is formed on the lower outer surface of the neck portion 5a. The inner bag container 5 inserted into the outer tubular container 3 is stably positioned by holding the circumferential projection 5d between the step 3g and the small projection 3h.
Furthermore, a notch 5d' is partially formed in the circumferential projection 5d. By forming the notch portion 5d' in this manner, an air passage from the action space X to the outside can be secured.

2 to 5, and particularly to FIG. 2, this composite cap comprises a cap body generally indicated at 10, an internal plug 11 and a check valve 13 held within the cap body 10. It is
In addition, in FIG. 2, the numbers of some members of the composite cap are omitted in order to avoid complication.

The cap body 10 has a cylindrical side wall 21 attached to the neck portion 3a of the outer cylindrical container 3 and an upper lid 23 hinged to the cylindrical side wall 21 .

A top plate portion 25 extending so as to close the inner space is integrally formed at the upper end of the cylindrical side wall 21 .
Although not particularly limited, the cylindrical side wall 21 is formed with an arc-shaped slit 27 extending downward from above, thereby forming a double wall structure. Due to such a double-walled structure, the used composite cap can be easily peeled off from the double-structured container 1 without using a special tool, and the separate disposal is enhanced. .

An undercut 29 is formed on the inner surface of the lower end of the cylindrical side wall 21 , and the undercut 29 engages with an undercut 3 f formed on the outer surface of the upper end of the neck portion 3 a of the outer cylindrical container 3 . As a result, the cap main body 10 (cylindrical side wall 21) is engaged with and held by the neck portion 3a.
Further, the undercut 29 is formed with a notch 29a (see FIG. 4) so that the air passage from the working space X to the outside (and the air passage from the outside to the working space X) is not blocked. It's like

On the lower surface of the top plate portion 25 extending inwardly from the upper end of the cylindrical side wall 21 , there extends downward to the inner side of the cylindrical side wall 21 at a distance from the inner surface of the cylindrical side wall 21 . The neck portion 3a of the outer cylindrical container 3 and the neck portion 5a of the inner bag container 5 are inserted into the space between the inner ring 31 and the cylindrical side wall 21. The outer surface is in close contact with the inner surface of the neck portion 5a of the inner bag container 5, thereby ensuring the sealing performance of the inner bag container 5. As shown in FIG.

Auxiliary projections 33 are circumferentially formed from the upper end portion of the inner surface of the cylindrical side wall 21 to the lower surface of the top plate portion 25. The auxiliary projections 33 extend from the upper end surface of the neck portion 3a of the outer cylindrical container 3 to the outer surface. By closely contacting, the cap main body 10 (cylindrical side wall 21) is firmly fixed to the neck portion 3a without rattling.
Furthermore, the auxiliary protrusion 33 formed in a circumferential shape is also provided with a plurality of notches 33a. In the example shown in FIG. 4, the notch 33a is formed at a position corresponding to the notch 29a formed in the undercut 29 described above. The position of the notch 33a is not limited to that shown in FIG.

An annular hanging flap piece 35 is provided on the lower surface of the top plate portion 25 on the outer side of the inner ring 31 and the inner side of the cylindrical side wall 21 . This annular hanging flap piece 35 functions as an air valve, and this function will be described later.

In the area surrounded by the inner ring 31 on the lower surface of the top plate portion 25 described above, an inner plug holding ring 37 (hereinafter simply referred to as (sometimes called a ring) is provided. The inner plug 11 is accommodated within the ring 37, and the ring 37 has a shape with a slightly tapered diameter downward so that the accommodated inner plug 11 is firmly held without falling off. A protrusion 39 is formed on the lower end of the inner surface of the ring 37 . Furthermore, a small circumferential projection 41 is formed on the lower surface of the top plate portion 25 on the inner side of the inner plug holding ring 37 to hold the inner plug 11 stably.

On the other hand, the upper surface of the top plate portion 25 is formed with a low top cover engaging protrusion 43 at the peripheral portion, so that the top cover 23 is firmly held when the top cover 23 is closed.

At the central portion of the upper surface of the top plate portion 25, a guide cylinder 45 for pouring out the content liquid is erected.
The guide tube 45 communicates with a hollow space (indicated by 200 in FIG. 2) in the cylindrical side wall 21 and serves as a discharge path for the liquid discharged from the inner bag container 5 .

The upper end portion of the cylindrical side wall 21 or the outer peripheral edge of the top plate portion 25 is rotatably connected to the upper lid 23 by a hinge band 47 .
The upper lid 23 is composed of a top plate portion 51 and a skirt portion 53 that continues to the outer peripheral edge of the top plate portion 51 .

In the upper lid 23, an engaging recess 55 is formed on the inner surface of the skirt portion 53. When the upper lid 23 is turned and closed, the recess 55 engages with the upper lid engaging projection 43 described above. As a result, the closed state of the upper lid 23 is stably maintained. An opening tab 57 is provided on the outer surface of the skirt portion 53 at a position opposite to the hinge band 47 . As a result, the user can easily open the upper lid 23 by holding the tab 57 .

A tall cushioning protrusion 59 is circumferentially formed on the inner surface of the top plate portion 51 (upper surface in FIG. 3). The tip of the shock-absorbing projection 59 (having a cutout portion) is formed so as to abut on the upper surface of the top plate portion 25 when the upper lid 23 is closed. That is, when a large vertical load is accidentally applied while the top cover 23 is closed, the stress is relieved by the cushioning projection 59, so that the pole 61, which will be described later, does not load the check valve 13 more than necessary. is prevented from giving

A pole 61 for urging the check valve 13 from above is erected at the central portion of the top plate portion 51 .
This pole 61 is a member for pressing and energizing the check valve 13 held by the inner plug 11 accommodated in the inner plug retaining ring 37 when the upper lid 23 is closed. When the valve 23 is closed, the pole 61 enters the content liquid pouring guide tube 45 and comes into contact with the check valve 13 . Therefore, the upper end of the guide tube 45 is formed to be shorter on the hinge band 47 side. The pole 61 has a relatively large diameter on the base side 61a and a small diameter on the tip side 61b. An inward projection 45a is provided. That is, when the upper lid 23 is closed, the pole 61 that has entered the guide tube 45 is firmly fixed by fitting the large-diameter root portion 61a with the inward protrusion 45a, and the small-diameter tip portion of the pole 61 is fixed. 61b is positioned and configured to abut the check valve 13 at a fixed position to energize the check valve 13; As a result, even if the valve body 81 of the check valve 13 has not returned to the normal position after the content liquid is discharged, the opening 70 is reliably closed by the valve body 81 .

Furthermore, a small protective annular projection 63 is provided on the inner surface of the top plate portion 51 at a position surrounding the pole 61 and surrounding the guide tube 45 when the top cover is closed. As a result, when the content liquid adheres to the pole 61 or its peripheral portion, the content liquid can be retained. That is, when the upper lid 23 is opened, the content liquid can be prevented from dripping onto the upper surface side of the top plate portion 25 . A small groove 65 is provided in the periphery of the pole 61 for the same purpose.

Further, as shown in FIG. 2, the inner plug 11 is accommodated in the inner plug holding ring 37 provided in the cap body 10. The inner plug 11 is attached to the guide cylinder 45. An opening 70 is formed in the central portion for communicating the inside with the inside of the inner bag container 5 . That is, the content liquid in the inner bag container 5 flows into the guide tube 45 through the opening 70 and is discharged from the guide tube 45 .

The inner plug 11 as described above includes a cylindrical base portion 71 , a circumferential inclined flange 73 extending inwardly upward from the lower end of the inner surface of the cylindrical base portion 71 , and an inner end of the circumferential inclined flange 73 . A descending wall 75 extending downward and a horizontal flange 77 protruding inwardly from the lower end of the descending wall 75 are formed. It's becoming Such a configuration of the inner plug 11 is formed to stably hold the check valve 13 described below.

That is, in order to discharge the content liquid contained in the inner bag container 5, the opening 70 must be in an open state. This opening 70 must be closed to prevent inflow. This is because when air flows in, the contracted bag-like portion 5b expands due to the discharge of the content liquid, which hinders the subsequent discharge of the content liquid. In addition, in order to keep the quality of the content liquid by suppressing the inflow of air into the inner bag container 5, which causes oxidative deterioration of the content liquid, the opening 70 should be quickly closed after the content liquid is discharged. desired. A check valve 13 is used to ensure such a function.

As shown in FIG. 2, the check valve 13 has a circular and slightly upwardly swollen dome-shaped valve body 81, which extends from an annular support member 83. It is vertically movably held by a plurality of straps 85 attached to it. The annular support member 83 is fitted and fixed inside the inner plug holding ring 37, and the valve body 81 is formed by the peripheral inclined flange 73 and the descending wall 75 so as to close the opening 70 in a normal state. When the valve body 81 is lifted while seated in the boundary region, the opening 70 is opened and the content liquid is discharged through the opening 70 . In this case, since the valve body 81 is held by a plurality of straps 85 , the liquid content that has passed through the opening 70 flows through the gaps between the straps 85 into the guide tube 45 . When the upper lid 23 is closed, the pole 61 firmly presses the valve body 81, so that the valve body 81 is fitted in the lowering wall 75, and the opening 70 is firmly closed by the valve body 81. state.

That is, by tilting the double structure container 1 with the upper lid 23 open and pressing the body 3c of the outer cylindrical container 3, the bag-shaped portion 5b of the inner bag container 5 is pressed, and the internal pressure rises at this time. The valve body 81 is lifted and the liquid content is expelled through the opening 70 as described above. Also, when the squeezing of the body portion 3c is stopped, the elasticity of the strap 85 causes the valve body 81 to return to the normal position that closes the opening 70. Further, by closing the upper lid 23, the valve body 81 moves toward the lowering wall 75. It will be firmly held inside.

Note that the assembly of the above-described inner plug 11 and check valve 13 into the cap main body 10 is performed by, for example, incorporating the check valve 13 into the inner plug 11 and then attaching this assembly to the inner plug holding portion of the cap main body 10 . This is done by pressing it into the ring 37. As a result, the inner plug 11 housing and holding the check valve 13 is firmly clamped and fixed at the cylindrical base 71 inside the ring 37 together with the protrusion 39 at the lower end.

By the way, when the upper lid 23 is opened and the body 3c of the outer cylindrical container 3 is pressed to push up the valve body 81 of the check valve 13 to discharge the liquid, the inner surface of the outer cylindrical container 3 and the inner bag container are pushed up. It is necessary to prevent the air from being discharged from the working space X between the outer surface of 5, and after the content liquid is discharged, introduce air into the working space X to return the working space X to normal pressure. In the present invention, a flexible annular hanging flap piece 35 (hereinafter simply referred to as a flap piece) is provided in order to ensure such a function.

Referring to FIG. 6 for explaining the function of this flap piece 35, first, this flap piece 35 is positioned on the lower surface of the top plate portion 25 on the outer side of the inner ring 31 and the inner side of the cylindrical side wall 21. It hangs down from the side and extends in the axial direction Z of the cap (see FIG. 6(a)). Therefore, the flap piece 35 can be molded without forcibly pulling it out.
However, the flap piece 35 does not necessarily have a vertical shape, and the flap piece 35 may be slightly inclined inward and outward as long as it can be molded.

In the present invention, when this composite cap is attached to the double structure container (the neck portion 3a of the outer cylindrical container 3), the outer cylindrical container 3 is filled in the space between the flap piece 35, the top plate portion 25, and the cylindrical side wall 21. The neck portion 3a of the outer cylinder container 3 is positioned on the outer surface side of the flap piece 35, and the lower end outer surface of the flap piece 35 abuts the inner surface of the neck portion 3a. It is designed to touch.

Incidentally, as shown in FIG. 2, the circumferential projection 5d formed on the neck portion 5a of the inner bag container 5 is formed with a notch 5d', and the neck portion 3a of the outer cylindrical container 3 is formed with a notch 5d'. A notch 3f′ is also formed in the undercut 3f on the upper end of the cylindrical side wall 21, and a notch 29a is also formed in the undercut 29 at the lower end of the cylindrical side wall 21. A notch 33a is also formed in the auxiliary projection 33 formed on the inner surface.

That is, in the normal state after attaching the cap, as shown in FIG. The working space X between the inner bag container 5 is maintained at the same pressure as the outside.
In this state, when the body portion 3c of the outer cylindrical container 3 is squeezed to be recessed, the pressure in the working space X rises, but as shown in FIG. The outer surface of the lower end strongly contacts the inner surface of the neck portion 3a of the outer cylindrical container 3 so as to be inclined. As a result, the air passage between the working space X and the outside is kept blocked, and the discharge of air from the working space X is reliably prevented. As a result, by squeezing the body portion 3c of the outer cylinder container 3, the valve body 81 is lifted to open the opening 70, and the content liquid can be discharged smoothly.

On the other hand, when the squeezing of the body portion 3c is stopped and the discharge of the content liquid is completed, the valve body 81 returns to the normal state and the opening 70 is sealed, and the bag-like portion 5b of the inner bag container 5 is closed by the discharge of the content liquid. Volume shrinks. At the same time, the body portion 3c of the outer cylindrical container 3 recovers from the depressed state to its original shape due to its own elastic force, and the action space X becomes a negative pressure state. At this time, the flap piece 35 tilts inward as shown in FIG. As a result, air is introduced into the action space X from the outside. Then, it returns to the state of FIG. 6(a) again. That is, by introducing air in this way, the following operation of squeezing the barrel portion 3c of the outer cylindrical container 3 to discharge the content liquid can be performed smoothly.

Further, in the present invention, a linear narrow groove 35a extending axially to the lower end is formed in at least a part of the outer surface of the flap piece 35 (the surface facing the cylindrical side wall 21). Further, it is preferable that the inner surface of the neck portion of the outer tubular container 3 with which the flap piece 35 abuts is an inclined surface Y as shown in FIG. Incidentally, in FIG. 4, the region where the linear thin groove 35a is provided is indicated by 100. As shown in FIG.

In the present invention, the outer surface of the flap piece 35 is formed with a thin linear groove 35a, and the inner surface of the neck portion of the outer cylindrical container 3 is formed as an inclined surface Y, thereby functioning as an air valve as described above, and degassing. The function can be given to the flap piece 35. - 特許庁
That is, when the linear thin groove 35a and the inclined surface Y are formed as described above, the lower end of the flap piece 35 is in contact with the inclined surface Y after the cap is attached. A gap exists between the inclined surface Y and the flap piece 35 due to the narrow groove 35a, and the working space X is in communication with the outside (see FIG. 6(a)). When the portion 3c is squeezed, the trunk portion 3c is greatly recessed, so that the pressure in the working space X is greatly increased, and the flap piece 35 is greatly bent outward (in the upward direction of the inclined surface), and strongly adheres to the inclined surface Y (Fig. 6(b)). As a result, the voids formed by the linear thin grooves 35a are blocked, and the content liquid can be smoothly discharged in the same manner as described above. Furthermore, when the squeezing is stopped, the body portion 3c of the outer cylindrical container 3 returns to its original shape from the depressed state due to its own elastic force, and the action space X becomes negative pressure, so that the flap piece 35 moves inward (inclines). Since it bends in a direction downward from the surface) and separates from the inclined surface Y, air is introduced from the outside into the working space X (see FIG. 6(c)).
As can be understood from the above description, the formation of the linear narrow groove 35a and the inclined surface Y does not impair the function of the air valve described above.

By the way, the pressure in the action space X may rise due to a change in the environment in which the double structure container 1 is placed, for example, an increase in the environmental temperature. In such a case, when the upper lid 23 is opened, the valve body 81 of the check valve 13 may be pushed up and the liquid content may be discharged. However, when the linear thin groove 35a and the inclined surface Y are formed as described above, the flap piece 35 does not come into strong contact with the inclined surface Y when the internal pressure rises due to the increase in the environmental temperature. , does not flex outward, and even if it flexes very little, as shown in FIG. Voids are secured as in the normal state. Therefore, even if the pressure in the working space X increases due to a change in the environmental temperature, gas is vented from the working space X through this gap, making it possible to effectively prevent the above problems.

As shown in FIG. 4, the region 100 in which the linear narrow groove 35a is formed on the outer surface of the flap piece 35 is the position of the notch 29a formed in the undercut 29 and the position of the notch 29a. The position of the notch 33a formed in the auxiliary projection 33 formed on the inner surface extending from the cylindrical side wall 21 to the top plate portion 25 is preferably set so as to correspond to the region 100. Gas can be effectively vented through the narrow grooves 35a.

As described above, according to the present invention, the formation of the flap piece 35 can effectively suppress the discharge of air from the action space X when discharging the content liquid by squeezing the body 3c of the external container 3. In addition, air can be quickly introduced into the working space X after the squeezing is stopped. Moreover, since such a flap piece 35 can be molded without forcible punching or the like during molding, it is effectively prevented from being damaged during molding.
Furthermore, by providing a linear narrow groove 35a on the outer surface of such a flap piece 35 and making the inner surface of the neck portion 3a of the outer cylindrical container 3 an inclined surface Y, the pressure in the working space X rises due to changes in the environmental temperature. It is also possible to effectively perform degassing at this time.

Incidentally, the cap main body 19, the inner plug 11 and the check valve 13 described above are all injection molded using an olefin resin such as low, medium or high density polyethylene, linear low density polyethylene, polypropylene, etc. After fitting and fixing the inner plug 11, which is manufactured by compression molding or the like and in which the check valve is housed, into the cap main body 10 as already described, the double structure container 1 (especially the outer cylinder It is attached to the neck 3 a ) of the container 3 .

1: Double structure container 3: Outer cylindrical container 3a: Neck 3c: Body 5: Inner bag container 5b: Bag-shaped body 10: Cap body 11: Inner plug:
13: Check valve 21: Cylindrical side wall 23: Top cover 37: Ring for retaining inner plug 45: Content liquid pouring guide tube 61: Pole 81: Valve body X: Working space Y: Inclined surface

Claims (6)

A composite cap provided on a double-structured container comprising an inner bag container for storing contents and an outer cylindrical container provided so as to cover the inner bag container,
The composite cap has a top plate, a cap body consisting of a cylindrical side wall that hangs down from the periphery of the top plate and is fitted to the neck of the outer cylindrical container, and a check valve. On the upper surface of the portion, a guide cylinder for pouring out the contents is erected and communicated with the hollow space in the cylindrical side wall. With the ring hanging down,
On the lower surface of the top plate portion, between the cylindrical side wall and the inner ring, air is taken into the space due to pressure fluctuations in the space between the inner bag container and the outer cylindrical container, or the space is filled with air. An annular hanging flap piece that functions as an air valve for preventing air discharge from the cap is provided so as to extend in the axial direction of the cap ,
The annular hanging flap piece abuts on the inner surface of the neck portion of the outer cylindrical container, and functions as an air valve by detachment from and contact with the inner surface of the neck portion,
A composite cap for a double structure container, wherein the annular hanging flap piece functions by coming into contact with an inclined surface formed on the upper end of the inner surface of the neck portion of the outer cylindrical container. A composite cap provided on a double-structured container comprising an inner bag container for storing contents and an outer cylindrical container provided so as to cover the inner bag container,
The composite cap has a top plate, a cap body consisting of a cylindrical side wall that hangs down from the periphery of the top plate and is fitted to the neck of the outer cylindrical container, and a check valve. On the upper surface of the portion, a guide cylinder for pouring out the contents is erected and communicated with the hollow space in the cylindrical side wall. With the ring hanging down,
On the lower surface of the top plate portion, between the cylindrical side wall and the inner ring, air is taken into the space due to pressure fluctuations in the space between the inner bag container and the outer cylindrical container, or the space is filled with air. An annular hanging flap piece that functions as an air valve for preventing air discharge from the cap is provided so as to extend in the axial direction of the cap ,
The annular hanging flap piece hangs down from the lower surface of the top plate portion at a distance from the inner surface of the cylindrical side wall, and the space between the annular hanging flap piece, the top plate portion, and the cylindrical side wall has a 1. A composite cap for a double structure container, wherein the neck of the outer cylindrical container is fitted . A composite cap provided on a double-structured container comprising an inner bag container for storing contents and an outer cylindrical container provided so as to cover the inner bag container,
The composite cap has a top plate, a cap body consisting of a cylindrical side wall that hangs down from the periphery of the top plate and is fitted to the neck of the outer cylindrical container, and a check valve. On the upper surface of the portion, a guide cylinder for pouring out the contents is erected and communicated with the hollow space in the cylindrical side wall. With the ring hanging down,
On the lower surface of the top plate portion, between the cylindrical side wall and the inner ring, air is taken into the space due to pressure fluctuations in the space between the inner bag container and the outer cylindrical container, or the space is filled with air. An annular hanging flap piece that functions as an air valve for preventing air discharge from the cap is provided so as to extend in the axial direction of the cap ,
An inner plug is provided in a region surrounded by the inner ring on the lower surface of the top plate portion, and the inner plug is formed with an opening that allows communication between the inside of the content liquid pouring guide tube and the inside of the inner bag container. is,
A composite cap for a double structure container, wherein an inner plug retaining ring extends from the lower surface of the top plate portion, and the inner plug is retained by the inner plug retaining ring. The annular hanging flap piece is provided with a narrow groove that secures a flow path for discharging air when the pressure in the space between the inner bag container and the outer cylindrical container increases due to environmental changes. Item 2. A composite cap for a double structure container according to item 1 . The composite cap has an upper lid provided to open and close the top plate portion, and the inner plug is provided with the check valve capable of opening and closing the opening of the inner plug. 4. A composite cap for a dual structure container according to claim 3 , further comprising a pole for urging said check valve to close said opening when said top cover is closed. A package comprising the composite cap for a double-layered container according to any one of claims 1 to 5 and a double-layered container to which the composite cap is attached.

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