JP2003072816A - Plug and packing container equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily take out a necessary amount of a content 5 from a packing container equipped with a plug 2 having a valve mechanism mounted on a mouth portion 11 of the container main body 1 of the packing container in which the liquid content such as a liquid or fluidized item or the like is filled and kept closed in a natural state. SOLUTION: The plug 2 comprises an elastically deformable valve portion 20 covering the mouth portion 11 of the container main body 1 and equipped with the valve mechanism and an attaching portion 22 to air-tightly mount the valve portion 20 on the mouth portion 11 wherein the valve portion 20 is of a dome-shape swelling toward the outside of the mouth portion 11 and the valve mechanism formed at a position distant from the center of the valve portion 20 is a slit 4 closed in a natural state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stopper attached to the mouth of a container body of a packaging container filled with a liquid content such as a liquid or a fluid, and a packaging container fitted with the stopper. The present invention relates to a stopper provided with a valve mechanism that is kept closed in a natural state and is opened and closed by directly pressing the stopper.

[0002]

2. Description of the Related Art As a packaging container for hermetically filling liquid contents such as liquids such as lotion, hair washes, chemicals or fluids, Japanese Patent Laid-Open No. 2000-25326 discloses contents 5
Disclosed is a packaging container in which a plug body 2 having a valve mechanism is attached as an inner plug body to a mouth portion 11 of a container body 1 composed of a bag-shaped inner container body 110 for filling the inside thereof and an outer container body 100 for enclosing the bag. Has been done.

In this example, as shown in FIG. 19, the elastically deformable plug 2 having a valve mechanism is attached to the opening 11 of the outer container body 100.
On the top of the plug body 2, the valve mechanism maintains a closed state in a natural state, and is elastically deformed by an external force to be in an open state so that the contents 5 can be taken out. Are formed.

Due to such a constitution, when the contents 5 are taken out from the packaging container of this example, the container body 1 is grasped so that the plug 2 is on the lower side, and the body portion 10 is attached. When pressed, the internal pressure of the inner container body 110 is increased,
The pressurized content 5 pushes open the slit 4 and is discharged to the outside. When the pressing of the body portion 10 is released, the slit 4 is elastically returned to the original closed state, and the discharge of the content 5 is stopped.

As a result, since the slit 40 is cleaved only when the contents 5 are taken out, it is possible to prevent the contents 5 from being oxidized or deteriorated, or to prevent invasion of various bacteria into the contents 5, and to not use them. Occasionally, the contents 5 are prevented from accidentally flowing out of the packaging container.

[0006]

However, in the above packaging container, first, the internal pressure of the container body 1 is increased by the pressing of the body portion 10 of the container body 1, and then the internal pressure of the container body 1 is increased by the increase of the internal pressure. The contents 5 are the slits 4
Since there is a step of pushing open and discharging to the outside, there is a time lag between the pressing of the body portion 10 and the discharging of the contents and the release of the pressing and the stop of the discharging of the contents. . Therefore, it is necessary to empirically understand the relationship between the amount of pressing of the body portion 10 and the discharge,
If not used, the pressing force may be so strong that the contents may be ejected in an excessive amount, and it is not easy to accurately extract the contents 5 in the required amount.

When the contents 5 are taken out of the packaging container, the slits 4 and the object for discharging the contents 5 are brought into non-contact with each other so as not to disturb the discharge of the contents 5. Discharged contents 5 because it is necessary to maintain
Will be dripped from the slit 4 to the object, though a short distance. Therefore, when the target object is inclined, the discharged content 5 may flow down along the inclined surface. In particular, when the content 5 is a low-viscosity liquid, this tendency is strong, and a considerable amount of the content 5 is often wasted before the necessary amount is taken out to the target object. Further, when such a packaging container is filled with a drug such as athlete's foot medicine to be applied to the skin, there is a fear that the eye drops may be mistakenly applied as eye drops.

Further, when the slit 4 is discharged very close to the object, the object and the slit 4 are brought into contact with each other so that dirt, germs and the like adhering to the object are contained in the container body. There is a fear of breaking into 1.

In order to solve such a problem, there is also a method in which the content 5 discharged from the slit 4 is temporarily secured on the palm or the like and then applied with a finger or the like, but it takes a lot of time and labor, and the palm or the palm is used. There is a problem that the finger is soiled by the contents 5. In particular, when the content 5 to be filled in the container body 1 is a coating chemical for athlete's foot and skin diseases in which bacteria propagate, or a detergent or a drug that is harmful when touched directly, such coating There is no way.

Further, in the packaging container of this example, the container body 1 must be molded from a material that is easily elastically deformed by pressing, and the pressing can be quickly released by providing an air vent hole or the like. It is necessary to devise the configuration of the container body 1 so that the container body 1 is elastically restored to the original state.

The present invention has been made in view of the above circumstances, and it is "closed in a natural state by being attached to an opening of a container body of a packaging container filled with a liquid content such as a liquid or a fluid". In the stopper with the valve mechanism maintained at
A first object is to make it possible to easily take out a necessary amount of contents from a packaging container having a stopper attached, and a second object is to make it possible to take out the contents directly and surely to a target location.
And the subject.

[0012]

[Means for Solving the Problems] Item 1 The technical means of the present invention for solving the above-mentioned first problem is that "the mouth of the container body is covered and elastically deformable with the valve mechanism. A valve portion and a mounting portion for mounting the valve portion in the mouth portion in an airtight state,
The valve portion is a dome shape that bulges outward of the mouth portion, and the valve mechanism is a slit portion that is formed at a position deviated from the center of the valve portion and that is closed in a natural state. ”
It is characterized by that.

According to this, since the valve portion is formed in a dome shape which bulges outward while being attached to the mouth portion of the container body, the valve portion can directly press the surface thereof with a finger or the like. It can be elastically deformed. Therefore, the slit portion formed in the valve portion can be easily cleaved by pressing an appropriate position of the valve portion to elastically deform the valve portion. Further, since the slit portion is maintained in a closed state in a natural state, the pressing portion is released and the valve portion returns to its original shape by its elastic restoring force, so that the slit portion is closed.

Therefore, in the packaging container to which the stopper of the present invention is attached, the container body is held so that the stopper is on the lower side, and the contents filled in the packaging container are filled with the valve portion. When the valve portion is directly pressed with a finger or the like to elastically deform the valve portion after being moved to the dome-shaped inner space, the slit portion is cleaved and the contents are discharged to the outside. When the pressing of the valve portion is released, the slit portion is closed and the discharge of the contents is stopped.

Since the slit portion is opened and closed in response to the elastic deformation of the valve portion due to the pressing, the degree of tearing of the slit portion can be adjusted by adjusting the pressing position and the pressing force of the valve portion. it can.

Further, since the slit portion is formed at a position deviated from the center of the valve portion which bulges into a dome shape, and is opened and closed in response to elastic deformation of the valve portion due to pressing, Even when the internal pressure of the container body is increased due to the pressing or deformation of the body portion, the slit portion is unlikely to be cleaved by the pressurized content.

* In the item 1 of paragraph 2, in which the slit portion is formed around the top portion of the valve portion, in the dome-shaped valve portion, there is a slit portion near the top portion that is easy to press. Since the slit portion is formed and the slit portion can be opened by pressing the top portion, the pressing operation of the valve portion is easy and the contents filled in the packaging container are easily taken out.

Particularly, in the case where the slit portion is formed within a radius of 10 to 20 mm from the center of the valve portion,
Since the slit portion is located in the vicinity of the fingertip when pressing one fingertip along the apex, it is possible to finely adjust the degree of cleavage of the slit portion by adjusting the pressure of the fingertip, so that the necessary amount of content Objects can be taken out easily and accurately.

* 3 In order to solve the above-mentioned second problem, "an elastically deformable valve portion covering the mouth portion of the container body and having the valve mechanism, and the valve portion on the mouth portion are provided. The valve mechanism has a mounting portion to be mounted in an airtight state, a protrusion protruding outward is formed on the surface of the valve portion, and the valve mechanism is in a natural state formed in the vicinity of the protrusion portion. It is a slit part that is closed by. ”

According to this, similarly to the above-mentioned item 1, by pressing the protrusion formed on the surface of the valve portion, the valve portion can be elastically deformed and the slit portion can be cleaved, and When the pressing is released, the valve portion returns to its original shape by the elastic return force, so that the slit portion can be closed. Therefore, in the packaging container in which the stopper of the present invention is mounted, the object of grasping the container main body so that the stopper is on the lower side and extracting the contents filled in the packaging container with the protruding portion When directly pressed against an object, hand, etc., the slit portion is cleaved and the content is discharged to the outside. When the pressing of the protrusion is released, the slit is closed and the discharge is stopped.

Since the slit portion is opened and closed by the elastic deformation of the valve portion due to pressing, the degree of tearing of the slit portion can be adjusted by adjusting the force for pressing the valve portion. Further, since the protrusion is projected from the surface of the valve portion where the slit portion is formed,
Even when the protrusion is directly pressed against the object or hand, the object or hand is unlikely to come into contact with the slit formed on the surface of the valve part. Here, the protrusion and the slit may be formed at any position on the valve surface, including the center of the valve.

* In the item 4 and 3, "the protrusion is a single protrusion protruding from the center of the valve, and the slit is formed concentrically outside the protrusion." In this configuration, since the valve portion is elastically deformed by the pressing of the protrusion, the slit portion formed concentrically on the outside of the protrusion is surely torn, so that the contents are surely secured. And it can be taken out stably. Here, the concentric slit part may be a concentric circular slit having the same center as the protrusion part or a linear slit formed radially around the protrusion part. .

* In the item 5 and 3, it is characterized in that "the protrusion is formed of a plurality of protrusions provided on the valve portion and the slit is formed between the protrusions". , Because the object pressed by the valve portion, the hand or the like is abutted and supported by a plurality of protrusions at a position apart from the surface of the valve portion,
Since the elastic deformation of the valve portion and the cleavage of the slit portion due to this elastic deformation are stable, the amount of contents taken out can be easily adjusted. Further, since it is difficult for the target object, the hand, or the like to come into contact with the slit portion, dirt and bacteria attached to the target object, the hand, etc. are prevented from entering the container body.

* In the item 6 and 5, "the protrusion is composed of four protrusions arranged in a square shape at a predetermined interval in the central portion of the valve portion, and the slit portion has a cross shape at the center of the valve portion. The slit and the slit due to the elastic deformation of the valve portion are also symmetrical in shape because the protrusion and the slit are arranged in line symmetry and point symmetry, respectively. Since it is cleaved, the contents can be reliably and stably taken out.

[7] In paragraphs 1 to 6, "the mounting portion is a cylindrical thick peripheral wall portion projecting upward from the mouth portion of the container body, and the peripheral wall portion is hermetically sealed in the mouth portion. And an elastically deformable thin valve portion provided with the valve mechanism so as to cover the opening at the upper end of the peripheral wall portion. ” And what
It is not necessary for the valve portion provided with the valve mechanism to cover the entire mouth portion of the container body, and the size and shape of the valve portion can be adjusted by adjusting the shape and size of the mouth portion of the peripheral wall portion. It is possible to set the shape and size suitable for taking out the.

Accordingly, unnecessary elastic deformation of the valve portion that does not cause the slit portion to be cleaved can be reduced, and the slit portion can be opened and closed by a smaller elastic deformation, which is suitable for taking out the contents. Since the valve portion can be set so as to perform, the contents can be efficiently taken out from the packaging container. Here, since the peripheral wall portion is set to be thick, it is not easily elastically deformed by the pressure on the valve portion or an external force.

* In Item 8, "The valve portion is arranged so that the surface thereof does not bulge above the upper edge of the peripheral wall portion, and the surface of the valve portion is closer to the upper edge than the upper edge. Also, a protrusion protruding upward is formed. ”In the above-mentioned valve, since the valve portion is elastically deformed by being pushed into the peripheral wall portion by the pressing of the protrusion portion, The ratio of elastic deformation of the portion is small, and the original shape is quickly elastically restored by releasing the pressing. Therefore, the slit portion is opened and closed in response to the pressing. In addition, since the surface of the valve portion does not bulge from the upper end edge of the peripheral wall portion, the valve portion is not inadvertently pressed, so that the contents can be accidentally discharged. To be prevented.

* In item 9 and 8, "the slit portion is composed of a plurality of slits formed at predetermined intervals along the peripheral portion of the valve portion", Since the valve portion and the peripheral wall portion are formed at the peripheral edge portion connected to each other, the slit portion is formed when the entire valve portion is pushed into the peripheral wall portion by a predetermined depth by pressing the protrusion portion. Since the slit portion is torn, the slit portion is not excessively torn by the pressing of the protrusion portion, and the discharge amount of the content from the slit portion is stable, so that the amount of the content taken out is adjusted. Is easy. Further, it is difficult to inadvertently discharge the contents due to an increase in the internal pressure of the container body.

[10] In item 8 or 9, "the protrusion is formed in the central part of the valve part, and the valve part is inclined downward from the central part to the peripheral part and the peripheral part is formed. Is bent upwards in ”,
Since the bent portion formed on the peripheral portion of the valve portion assists the elastic return of the valve portion pushed into the inside of the peripheral wall portion by pressing, the slit portion is closed in response to the release of the pressing. Discharging of the contents is stopped. Therefore, it is easy to adjust the amount of contents taken out from the packaging container.

* In the item 11 or 8 or 9, "the valve portion is curved with a predetermined radius so as to be inclined downward from the peripheral edge portion to the central portion", the valve portion is previously described. Since it is arranged so as to be pushed into the inner side of the peripheral wall portion, the proportion of elastic deformation due to the pressing is small, and the valve portion is pushed excessively by the pushing of the projection portion and the slit portion is excessively cleaved. Since it rarely occurs, the amount of contents taken out from the packaging container can be easily adjusted.

* 12 In the items 1 to 11, "The slit portion has a V-shaped cross section which is in close contact with the outer surface which is the surface of the valve portion and expands inward on the inner surface. In the natural state, the edges of the slit portion are in close contact with each other on the outer surface side, but the inner surface side is notched in a V-shaped cross section. Since they are separated from each other, a small force is required to press the valve portion when the valve portion is pressed to split the slit portion. Further, there is an advantage that the valve portion having the slit portion can be integrally formed with the plug body by injection molding of rubber or synthetic resin material.

* 13 In a packaging container characterized in that "the plug according to item 1 or 3 is attached", the slit part which is the valve mechanism is cleaved by directly pressing the plug. Since it is possible to discharge the contents from the container body with ease, it is easy to take out the contents from the packaging container. Further, since it is not necessary to elastically deform the container body on which the stopper is mounted, it is not necessary to select the container body in consideration of properties of the container body such as easiness of elastic deformation and elastic return force.

As a concrete stopper used in the packaging container of the present invention, there is provided an elastically deformable valve portion which covers the mouth portion of the container body and is provided with the valve mechanism, and the valve portion which is the mouth portion. The valve portion is a dome shape that bulges toward the outside of the mouth portion, and the valve mechanism is located at a position off the center of the valve portion. A plug body characterized by being a slit part that is closed in a natural state formed, and "an elastically deformable valve part that covers the mouth part of the container body and has the valve mechanism, and the valve. And a mounting portion for mounting the portion to the mouth portion in an airtight state, and a protrusion protruding outwardly is formed on the surface of the valve portion, and the valve mechanism is provided in the vicinity of the protrusion portion. It is a slit part that is closed in the natural state Plug "and the like can be considered characterized the door.

* In item 14 and 13, in which the container is molded from a hard resin material or a non-elastic material, the container body is elastically deformed even when pressed from the outside. Since it does not occur, it is difficult for the contents to be discharged carelessly. Here, the non-elastic material may be glass, metal, ceramics or the like as long as it has rigidity that is not elastically deformed by external pressure.

Further, as in the item 3, in the structure in which the valve portion of the plug body is elastically deformed by the pressing of the protruding portion provided on the surface thereof, the body portion of the container body is pressed no matter how much. However, the slit portion is not cleaved. Therefore, even if the user mistakes the contents of the packaging container as eye drops and presses the container body to try to apply it by mistake, the contents will not drip, so that an eye accident due to misuse can be prevented. it can.

[0036]

The present invention, having the above-mentioned structure, has the following unique effects. In the packaging container in which the stopper of the present invention is attached to the mouth of the container body, the valve portion of the stopper is directly pressed with a finger or the like to rupture the slit portion and the contents can be discharged to the outside and the pressing is performed. Since the discharge can be stopped by releasing and closing the slit portion, the contents can be easily taken out from the packaging container only by pressing the stopper.

Since the degree of cleavage of the slit portion can be adjusted by adjusting the position of pressing the valve portion and the pressing force, and the valve portion on which the slit portion is formed is directly pressed, it is the same as the conventional example. In addition, since there is almost no time lag between the pressing and the discharging of the contents and the release of the pressing until the discharging is stopped, the necessary amount of the contents can be accurately and easily taken out from the packaging container. be able to.

Further, since the contents can be taken out from the packaging container only by pressing the valve portion of the stopper, the stopper of the present invention can be attached to form a non-elastic material such as a hard resin material or glass. The contents can be easily taken out from the packaging container having the container main body.

Further, since the slit portion is less likely to be split due to the increase in the inner thickness of the container body, the contents will not inadvertently flow out from the packaging container. In addition, since the contents are stored in an airtight state in a natural state, the contents are prevented from being oxidized and deteriorated, or invasion of various bacteria into the contents is prevented.

According to the item (2), the pressing operation of the valve portion of the stopper is easy, and the necessary amount of the contents filled in the packaging container can be easily and accurately taken out from the packaging container.

According to the item (3), as in the above item (1), the contents can be easily taken out from the packaging container only by the pressing operation of the valve portion, and the required amount of the contents can be properly extracted from the packaging container. And it can be taken out easily. Further, by mounting the stopper body of the present invention, the contents can be easily taken out from the container body made of a non-elastic material.

Further, the contents can be discharged to the outside by directly pressing and pressing the object filled with the protrusions to the object to be taken out or the hand, and when the pressing is released, the contents can be discharged. Since the discharge can be stopped, the contents filled in the container body can be directly and surely taken out to the target location of the object. By repeatedly pressing and releasing the projection to open and close the slit portion, the contents can be intermittently taken out in a fixed amount.

Further, since it is difficult for the object or hand directly pressed against the protrusion to come into contact with the slit, even when the slit and the protrusion are arranged close to each other, the slit is There is no possibility that the discharge of the contents is blocked by being blocked by the object or hand. Further, it is possible to prevent dirt, miscellaneous bacteria and the like adhering to the object and hands from entering the inside of the packaging container.

According to the item (4), the contents can be reliably and stably taken out from the packaging container.

According to the item 5, the amount of contents taken out from the packaging container can be easily adjusted, and dirt and various bacteria adhering to the object pressed against the stopper, the hand, etc. enter the container. Is prevented.

According to item 6, the contents can be reliably and stably taken out from the packaging container.

According to item 7, the contents can be efficiently taken out from the packaging container.

According to the item (8), the slit portion is opened / closed in response to pressing and releasing of the valve portion of the plug. Further, it is possible to prevent the contents from being accidentally discharged from the packaging container due to the careless pressing of the valve portion or the like.

According to item 9, it is easy to adjust the amount of contents taken out from the packaging container. Further, it is difficult for the contents to be carelessly discharged from the packaging container.

According to item 10 or 11, it is easy to adjust the amount of contents taken out from the packaging container.

According to the item 12, the force for pressing the valve portion of the stopper is small.

According to item 13, it is easy to take out the contents from the packaging container. In addition, it is not necessary to select in consideration of the properties of the container body used for the packaging container.

According to item 14, it is difficult to inadvertently discharge the contents from the packaging container. Further, it is possible to prevent an eye accident such that the contents filled in the packaging container are mistakenly applied as eye drops.

[0054]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the embodiments of the present invention described above will be described in detail with reference to the accompanying drawings. <Embodiment 1> FIGS. 1 and 2 show a chemical container in which a stopper body, which is an example of an embodiment of the present invention, is attached as an inner stopper body to a container body molded from a hard resin material.

This is a dome-shaped valve portion 2 having a valve mechanism for taking out the medicine 5 at an opening 11 of a cylindrical container body 1 for accommodating a liquid medicine which is the content 5.
0, an attachment portion 22 for attaching the valve portion 20 to the mouth portion 11 of the container body 1, and an annular flange 23 formed on the attachment portion 22 and made of an elastic resin. And the valve mechanism is a hemispherical projection 3 projecting upward from the top portion 24 of the valve portion 20.
And a slit 4 formed in the vicinity of the protrusion 3. A cap 13 screwed onto a screw portion formed on the outer periphery of the mouth portion 11 is covered above the plug body 2.

As shown in FIG. 2, the stopper 2 is attached to the container body 1 in such a manner that the mounting portion 22 is fitted in the mouth portion 11, and is pressed by the valve portion 20. The flange 23 circumferentially formed around the upper portion of the mounting portion 22 is supported by the upper end edge of the mouth portion 11 from below so as to prevent the stopper body 2 from falling into the container body 1.

* Valve portion 20 The valve portion 20 has a hollow dome shape that covers the mouth portion 11 and bulges upward from the upper edge of the mouth portion 11, and can be easily elastically deformed by a small pressure. In addition, the valve portion 20 is formed of an elastic synthetic resin material that can elastically return to its original dome shape when the pressing force is released. As shown in FIG. Shaped protrusion 3 is formed concentrically with the valve portion 20, and a linear slit 4 that is opened and closed in response to elastic deformation of the valve portion 20 is formed in the vicinity of the protrusion 3. . In this example, the valve portion 20, the mounting portion 22 and the flange 23 provided on the valve portion 20 are integrally molded from an elastic synthetic resin material.

* Slit 4 The slit 4 is, as shown in FIG.
Is a single linear slit 4 cut in the vicinity of a predetermined length and is filled in the container main body 1 when the top portion 24 is deformed in a manner of being depressed by the pressing of the protrusion 3. It is formed so as to cleave so that the chemicals 5 thus separated can be taken out to the outside.

Further, as shown in FIG. 3, the slit 4 has its edges closely contacting each other on the outer surface side which is the surface of the valve portion 20 so that the container body 1 can be kept airtight in a natural state. In addition, a groove 41 having a V-shaped cross section is formed on the inner surface side of the valve portion 20 so as to expand toward the inner space. The depth of the groove 41 is set so as not to reach the outer surface of the valve portion 20.

* Actual Use of Chemical Container Next, the case of taking out the chemical 5 filled in the chemical container of this example to the outside will be described. As shown in FIG. 5, the medicine container is attached to the container body 1 by grasping the container body 1 such that the fingertip is attached to the protrusion 3 formed on the valve portion 20 so that the plug body 2 is on the lower side. The filled chemical 5 is added to the valve 2
4, the valve portion 20 is elastically deformed so that the protrusion 3 and its peripheral portion are depressed when the protrusion 3 is pushed in the direction of the arrow as shown in FIG. To be done. Due to this elastic deformation, the slit 4 formed in the vicinity of the projection 3 is cleaved to secure a flow path for discharging the medicine 5, and the medicine 5 moved to the inner space of the valve portion 20 is It is discharged to the outside through the flow path.

After the required amount of the medicine 5 is taken out, when the pressing of the projection 3 by the fingertip is released, the valve portion 20 quickly returns to the original dome shape by its elastic restoring force and the slit portion 20 is closed. Therefore, the discharge of the chemical 5 is stopped.

Here, since the size of the flow path for discharging the chemical 5 is determined by the degree of tearing of the slit 4 due to the elastic deformation of the valve portion 20, the pressing of the protrusion 3 is moderated. By adjusting the elastic deformation of the valve portion 20, the opening degree of the slit 4, that is, the discharge amount of the medicine 5 can be adjusted.

With the above-described structure, in the medicine container of this example, the valve portion 20 of the stopper 2 can be directly pressed with a fingertip to discharge the medicine 5 to the outside, and the pressing is released. Since the discharge can be stopped by doing so, it is easy to take out the medicine 5 from the medicine container.

Since the slits 4 can be opened and closed by pressing and releasing the protrusions 3 provided in the vicinity of the slits 4, from the pressing of the protrusions 3 to the discharge of the medicine 5 and the release of the pressure. There is almost no time lag until the discharge is stopped, and the timing of pressing the protrusion 3 and discharging the medicine and releasing the pressure and stopping the discharge are almost the same. The medicine 5 can be taken out accurately and easily. Even when the required amount is small, the discharge amount of the chemical 5 can be easily adjusted.

Since the slit 4 is closed in a natural state, the medicine 5 filled in this medicine container is always kept in an airtight state when not in use, so that the medicine 5 comes into contact with the outside air. Oxidation and deterioration, or invasion of various bacteria into the chemical 5 can be prevented.

In this example, since the slit 4 has a linear shape, the slit 4 is largely cleaved when pressing a predetermined position of the valve portion 20, but the slit 4 is pressed at a position other than the predetermined position. Since it is difficult to be cleaved due to an increase in the internal pressure of the container body 1 and the like, the medicine 5 rarely inadvertently flows out of the medicine container.

Further, since the slit 4 is formed in the vicinity of the apex 24 deviated from the center of the dome-shaped valve portion 20, as shown in FIG. 5, the container body 1 is grasped by four fingers other than the index finger, Since it is possible to press the top portion 24, which is the most easily pressed, with the index finger having a good sensation to appropriately open the slit 4, and to discharge the medicine 5 to the outside,
The medicine 5 can be easily taken out from the packaging container.

In this example, since the container body 1 molded from the hard resin material is used, even if the body portion 10 of the container body 1 is pressed, the slits 4 and 4 can be torn. In addition, the chemical 5 is not extruded by pressing the container body 1. As a result, the careless discharge of the chemical 5 due to the increase in the internal pressure of the container body 1 is unlikely to occur.

In the above description, by pressing the protrusion 3 with a fingertip, the valve portion 20 is elastically deformed and the chemical 5 is added.
Although the protrusion 5 is taken out, the protrusion 3 may be directly pressed against an object such as a diseased part to which the drug 5 is to be applied to press the protrusion 3 to directly eject the drug 5 to the object. . At this time, the protrusion 3 protruding from the surface of the valve portion 20 is provided between the slit 4 and the object.
As a result, a gap is created, so that the slit 4 in the cleaved state is not blocked by the object and the discharge of the medicine 5 is not hindered.

<Embodiment 2> Similar to the above-described example (Embodiment 1), FIGS. 6 and 7 show a container body made of a hard resin filled with a liquid chemical 5 to be applied to a diseased part. The chemical | medical agent container which attached the stopper body 2 which is an example of other form of implementation of this invention to the mouth part 11 of 1 is shown.

The stopper 2 of this example has a thick cylindrical peripheral wall portion 21 projecting upward from the opening 11 of the container body 1.
An elastically deformable thin wall provided with a valve mechanism that is provided so as to cover the opening of the peripheral wall portion 21 and that has a protrusion 3 protruding from the center and a plurality of slits 4 and 4 that can be opened and closed. Of the valve portion 20 and the mounting portion 2 that is provided below the peripheral wall portion 21 and that mounts the peripheral wall portion 21 on the mouth portion 11.
6 and an annular flange 23 formed around the connecting portion between the peripheral wall portion 21 and the mounting portion 26 that form the mounting portion 22.

The stopper body 2 is attached to the mouth portion 11 in such a manner that the mounting portion 22 is fitted in the mouth portion 11 and the flange 23 is abutted and supported from below by the upper edge of the mouth portion 11. It is installed in an airtight state. Further, a screw portion for screwing the cap 13 is formed on the outer periphery of the mouth portion 11. In addition, in the plug body 2 of this example, the peripheral wall portion 21, the valve portion 20, the mounting portion 26, and the flange 23.
Is integrally molded from an elastic synthetic resin material.

As shown in FIG. 7, the peripheral wall portion 21 has a cylindrical shape extending upward from the mouth portion 11 of the container body 1 in an upright state, and is arranged at an upper end portion of the peripheral wall portion 21. It is set so as to have a wall thickness that is not easily elastically deformed by the pressure of the valve portion 20 or an external force, and the size of the opening of the peripheral wall portion 21 covers the valve portion 20 that covers the same. It is shaped so that it can be set to a shape and size suitable for taking out.

The mounting portion 26 and the flange 23 are set to have a wall thickness so as not to be easily elastically deformed similarly to the peripheral wall portion 21 so that the mounting portion 26 and the flange 23 can be securely mounted in the mouth portion 11 in an airtight state. In addition, the lower end of the mounting portion 26 is shown in FIG.
As shown in FIG. 3, the outer peripheral surface is obliquely cut inward so that the plug 2 can be easily attached to the mouth 11.

As shown in FIGS. 6 and 7, the valve portion 20 is a thin disk-shaped member provided in the inner peripheral wall of the upper end portion of the peripheral wall portion 21, and is easily pressed by the protrusions 3. The wall thickness is set to elastically deform and quickly elastically return to the original shape when the pressing is released.

The valve portion 20 has a peripheral edge portion 21 which is a connecting portion with the peripheral wall portion 21 from a central portion where the protrusion 3 is provided in a protruding manner.
It gradually inclines downwards and bends upward at the peripheral edge to assist the elastic return of the valve section 20. As shown in FIG. 6, a bent portion 25 connecting the peripheral wall portion 21 and the valve portion 20 and slits 4 and 4 to be described later formed along the peripheral portion are alternately formed on the peripheral portion. It has been configured.

The protrusion 3 is a cylinder having a diameter slightly larger than that of the valve portion 20 concentrically provided in the central portion of the valve portion 20, and as shown by a broken line in FIG. Even when it is pushed into the inside of the peripheral wall portion 21 by pressing, most of it is set to a size such that it projects upward from the upper edge of the peripheral wall portion 21. Further, the upper portion of the protrusion 3 is formed in a hemispherical shape so that the protrusion 3 does not hurt when directly pressed against the diseased portion.

As shown in FIG. 6, the slits 4 and 4 have an arcuate shape which is concentric with the protrusion 3 formed point-symmetrically and line-symmetrically at regular intervals along the peripheral edge of the valve portion 20. Yes, when the valve portion 20 is elastically deformed by the pressing of the projection 3 in the natural state, the slits 4, 4 are formed as shown in FIGS. 8 and 9.
4 is set to be cleaved.

Further, in the slit 4, the peripheral portion of the valve portion 20 and the inner peripheral wall of the peripheral wall portion 21 are in close contact with each other on the outer surface side of the valve portion 20 in a natural state,
On the inner surface side, over the range shown by the broken line portion in FIG.
The peripheral portion is cut obliquely toward the center side. Next, a case where the medicine 5 is actually taken out from the medicine container of this example will be described.

As shown in FIG. 10, after holding the container body 1 so that the stopper 2 is on the lower side,
When the protrusion 3 is directly pressed against the diseased part to which the chemical 5 is to be applied, as shown in FIG. 9, the protrusion 3 is pushed into the inner side of the peripheral wall part 21 and the valve part 20 is surrounded by the peripheral part. Elastically deformed so as to incline downward from the center to the center. Due to this elastic deformation, the slits 4 and 4 are cleaved and the medicine 5 is discharged. As shown in FIG. 10, the discharged chemicals 5 have the projections 3
And is discharged to the diseased part.

After the required amount of the chemical 5 has been taken out, when the pressing of the projection 3 is released, the valve portion 20 quickly returns to its original shape due to its elastic restoring force and the elasticity of the bent portion 25, and the slit Since the parts 4 and 4 are closed, the discharge of the medicine 5 is stopped.

Because of the above-mentioned structure, in the chemical container of this example, as in the above-mentioned example (Embodiment 1),
The chemical 5 can be discharged to the outside by directly pressing the protrusion 3 formed on the valve portion 20 of the stopper 2, and the discharge of the chemical 5 can be stopped by releasing the pressing. Therefore, it is easy to take out the medicine 5 from the medicine container. Further, since the timing of pressing the projection 3 and discharging the medicine 5 and releasing the pressing and stopping the discharge are almost the same, a necessary amount of the medicine 5 from the medicine container is
Can be taken out accurately and easily.

Furthermore, the chemical 5 can be discharged to the diseased part by directly pressing and pressing the protrusion 3 against the diseased part, and the discharge of the drug 5 can be stopped by releasing the pressing. Therefore, the required amount of the drug 5 can be directly and surely taken out to the diseased part.

The chemicals 5 can be obtained by repeatedly pressing and releasing the projection 3 while the projection 3 is still pressed against the diseased part or the pressing position is gradually moved to the periphery.
It is possible to apply the required amount of the drug 5 to the diseased part by intermittently discharging the drug in a fixed amount.

In this example, since the slits 4 and 4 are formed concentrically with the protrusion 3, the slits 4 and 4 are surely torn by the pressing of the protrusion 3 and the peripheral portions are Since the elastic return force of the valve portion 20 is reinforced by the elastic force of the formed bent portion 25, the released valve portion 20 quickly returns to its original state. It is easy to adjust the amount to be taken out, and the chemicals 5 due to poor closing of the slits 4 and 4.
Is unlikely to flow out.

Further, since the slits 4 and 4 and the bent portions 25 and 24 are formed along the peripheral portion of the valve portion 20, the bent portions 25 located at both ends of the slits 4 and 4 are formed. , 25 limit the degree of cleavage of the slits 4, 4, so that the slits 4, 4 are not excessively cleaved by the pressing of the protrusion 3 and the chemical 5
The discharge amount of is stable.

In this example, the valve portion 20 does not bulge above the upper end edge of the peripheral wall portion 21 so that the valve portion 20 is inscribed at a position inside the upper end edge of the peripheral wall portion 21. Therefore, even when the object is supported by the protrusion 3 and the upper edge of the peripheral wall portion 21 and the protrusion 3 is pressed against a soft object or an uneven surface, the slits 4, 4 and the diseased part are not Because they are kept in contact,
The slits 4 and 4 are not blocked and the discharge of the chemical 5 is not hindered. In addition, contamination of the diseased part and invasion of germs into the inside of the container body 1 are prevented.

In this example, since the container body 1 molded from a hard resin material is used, even if the body portion 10 of the container body 1 is pressed, the slits 4 and 4 can be split. In addition, the chemical 5 is not extruded by pressing the container body 1. As a result, the careless discharge of the medicine 5 due to an increase in the internal pressure of the container body 1 is unlikely to occur, and the medicine 5 is dropped even if the medicine 5 filled in the medicine container is mistakenly used as an eye drop. Therefore, it is possible to prevent an eye accident due to misuse.

In this example, the drug 5 that has flown directly to the diseased part through the projection 3 gradually spreads concentrically from the outflow position, so that the drug 5 is fed from above the diseased part. The medicine 5 is less likely to flow down along the slope of the diseased part and is less wasteful than the one in which is dripped.

<Third Embodiment> FIGS. 11 and 12 show
Similar to the above-described examples (Embodiments 1 and 2), the mouth 11 of the container body 1 made of a hard resin filled with the liquid chemical 5 is a stopper which is an example of another embodiment of the present invention. 2 shows a chemical container to which 2 is attached.

The plug 2 of this example has a cylindrical thick peripheral wall portion 21 protruding upward from the mouth portion 11 and the peripheral wall portion 2.
A plurality of protrusions 30 and 30 provided so as to cover the opening of the first protrusion and provided at the center thereof.
30, an elastically deformable thin valve portion 20 having a valve mechanism composed of slits 40, 40 formed between 30; a mounting portion 26 for mounting the peripheral wall portion 21 on the mouth portion 11;
The valve portion 2 is composed of an annular flange 23.
The parts other than 0 have the same structure as the above-mentioned example (Embodiment 2).

As shown in FIGS. 11 and 12, the valve portion 20 is a thin disk-shaped member disposed on the upper edge of the peripheral wall portion 21 and is connected to the upper edge of the peripheral wall portion 21. It is curved with a predetermined radius so as to be inclined downward from the peripheral portion which is a portion to the central portion of the valve portion 20.

At the center of the valve portion 20, the valve portion 20
Two linear slits 4 intersecting in a cross at the center of the
0 and 40, and cylindrical projections 30 and 30 which are projected in a rectangular shape so as to be point-symmetrical and line-symmetrical to each other in four regions divided by the slits 40 and 40, Similar to the protrusion 3 of the above-described example (Embodiment 2), the upper portions of the protrusions 30 and 30 are formed in a hemispherical shape. Further, the slits 40, 40 are formed in a V-shaped cross section on the inner surface side, as in the above-described example (Embodiment 1).

When the medicine 5 is taken out from the medicine container of this example, after grasping the container body 1 so that the plug 2 is on the lower side, as in the above-mentioned example (Embodiment 2), When the protrusions 30 and 30 are directly pressed against the diseased portion and pressed, as shown in FIG. 14, the valve portion 20 causes the peripheral wall portion 2 to contact the upper portions of the protrusions 30 and 30 with each other.
1 is elastically deformed in a manner of being pushed inward. As a result of this elastic deformation, as shown in FIG. 13, the slits 40, 40 are cleaved in a star shape and the drug 5 is discharged to the outside. After taking out the required amount of chemicals 5, the protrusions 30,
When the pressing of 30 is released, the valve portion 20 returns to its original shape by its elastic return force, and the slit portions 40, 40
Is closed, the discharge of the medicine 5 is stopped.

Because of the above-mentioned structure, in the medicine container of this example, as in the above-mentioned examples (Embodiments 1 and 2), by directly pressing the protrusion 3, the medicine 5 is discharged or Since the discharge can be stopped, the drug 5 can be easily taken out from the drug container, and the pressing of the protrusion 3 and the timing of the discharge of the drug 5 are almost the same, so that the drug 5
Can be taken out accurately and easily.

Further, as in the case of the above-described example (Embodiment 2), since the medicine 5 can be discharged by directly pressing the protrusion 3 against the diseased part, the necessary amount of the medicine 5 can be directly and directly applied. The medicine 5 can be reliably taken out to the diseased part, and the medicine 5 can be intermittently discharged.

In this example, since the slits 40, 40 are formed between the protrusions 30, 30,
Since the slits 40, 40 and the diseased part are kept in non-contact with each other, dirt and germs of the diseased part are reliably prevented from entering the inside of the container body 1.

Further, the valve portion 20 is previously provided with the peripheral wall portion 21.
Since it is curved in a state of being pushed inward, elastic deformation due to pressing is small and the valve portion 20 is not excessively pushed to discharge a large amount of chemicals, so that the waste of the chemicals 5 is small.

<Embodiment 4> FIG. 15 and FIG.
Similar to the above-described examples (Embodiments 1 to 3), the mouth portion 11 of the container body 1 made of a hard resin filled with the liquid chemical 5 is used.
FIG. 3 shows a chemical container to which the stopper 2 according to another embodiment of the present invention is attached.

The plug body 2 of this example is provided with a valve mechanism which covers the mouth portion 11 and is provided with a valve mechanism including slits 40 formed between the protrusions 30 provided at the center of the mouth portion 30. Dome-shaped valve section 20 and the valve section 20
Mounting portion 22 that is continuously provided below the circular flange 2
3 and the parts other than the valve mechanism have the same structure as the above-described example (Embodiment 1).

As shown in FIGS. 15 and 16, the valve section 20 has a dome shape that bulges upward from the mouth section 11, and the valve section 20 is similar to the above-described example (Embodiment 3). Linear slit 4 intersecting in a cross shape at the center of the portion 20
0 and 40 and small cylindrical projections 30 and 30 projectingly provided in the four regions divided by the slits 40 and 40, respectively.
The inner surface side of 0 is formed to have a V-shaped cross section, as in the above-described example (Embodiment 1).

When the medicine 5 is taken out from the medicine container of this example, the protrusion 3 is used as in the case of the above-mentioned example (Embodiment 3).
When 0 and 30 are pressed against the diseased part and pressed, the slits 40 and 40 are cleaved and the drug 5 is discharged. Also, when the pressing of the protrusions 30 and 30 is released, the slit 4
0 and 40 are closed and the discharge of the medicine 5 is stopped.

Since the structure is as described above, the chemical container of this example has the above-mentioned examples (Embodiments 1 to 3).
Similarly to the above, it is easy to take out the medicine 5 from the medicine container, and the necessary amount of the medicine 5 can be taken out directly and surely to the diseased part. In addition, it is possible to reliably prevent dirt and germs on the diseased part from entering the inside of the container body 1.

<Embodiment 5> FIG. 17 and FIG.
Similar to the above-mentioned examples (Embodiments 1 to 4), the mouth portion 11 of the container body 1 made of a hard resin filled with the liquid chemical 5 is used.
FIG. 3 shows a chemical container to which the stopper 2 according to another embodiment of the present invention is attached.

The plug body 2 of this example has a thick cylindrical peripheral wall portion 21, a projection 3 which covers the opening of the peripheral wall portion 21 and is provided at the center thereof and the projection 3 as a center. An elastically deformable thin valve portion 20 having a valve mechanism including radially formed slits 40, and the peripheral wall portion 21.
And a ring-shaped flange 23 and a mounting portion 26 that is continuously provided below the
The components other than the valve portion 20 have substantially the same configuration as the above-described examples (Embodiments 2 and 3).

As shown in FIGS. 17 and 18, the valve portion 20 has a dome shape arranged so as to bulge upward from the upper edge of the peripheral edge portion 21, and the peripheral wall portion 21.
It is formed so that the wall thickness gradually decreases from the peripheral portion, which is the connecting portion with the, toward the top portion 24. Further, in order to reinforce the elastic restoring force of the valve portion 20, as shown in FIG. 18, a bent portion 25 bent toward the center side by a predetermined angle is concentric with the valve portion 20 as shown in FIG. It is formed into a shape.

The valve portion 20 has a cylindrical protrusion 3 that is concentrically provided with the valve portion 20 at the center thereof, and the protrusion 3 is centered on the protrusion 3 and extends outward from the lower end edge of the protrusion 3. 8 straight slits 40, 40
Is formed, and the slits 40, 40 are formed from the lower end of the protrusion 3 to the peripheral portion of the valve portion 20, and similar to the above-described example (Embodiment 1), the slits 40, 40 are formed. The inner surface side of 40 is formed in a V-shaped cross section.

When the medicine is taken out from the medicine container of this example, the protrusion 3 is used as in the case of the above-mentioned example (Embodiment 2).
When 0 and 30 are pressed against the diseased part and pressed, the slits 40 and 40 are cleaved and the drug 5 is discharged. Also, when the pressing of the protrusions 30 and 30 is released, the slit 4
Nos. 0 and 40 are closed and the discharge is stopped.

Since the structure is as described above, the chemical container of this example has the above-mentioned examples (Embodiments 1 to 3).
Similarly to the above, it is easy to take out the medicine 5 from the medicine container, and the necessary amount of the medicine 5 can be taken out directly and surely to the diseased part.

In this example, since the valve portion 20 in which the pressing of the protrusion 3 is released is quickly elastically restored to the original state with the help of the bent portion 25, the medicine 5 from the medicine container is It is easy to adjust the take-out amount and the inconvenience such as the outflow of the chemical 5 due to the poor closing of the slits 4 and 4 hardly occurs.

Other Embodiments In the above-mentioned example, the protrusions 3 and 30 are all formed integrally with the valve portion 20, but are separately molded from the valve portion 20, and the top portion 24 and other predetermined portions are formed. It may be arranged at the position by adhesion or the like, and the shape and the number thereof are not limited to those shown in the above example.

Further, in the structure in which the valve portion 20 is bulged upward as in the first and fifth embodiments, the valve portion 20 is directly pressed with a fingertip or the like to open the slits 4, 40. Since it is possible to easily take out the chemical 5 by means of the
It is possible to obtain the same effect with respect to the taking out of. Further, when the projections 3 and 30 are not provided, it is desirable to provide a mark so that the user can recognize the pressing position where the slits 4 and 40 are efficiently cleaved.

In the above example, the slits 4, 40
Is formed in a straight line shape that is crossed in an arc shape, crossed in a cross shape, or formed in a radial shape along the peripheral portion of the valve portion 20, but the slit 4 may have a wavy shape or another curved line. Well, the formation position and the number thereof are not limited to those shown in the above-mentioned example.

In the above example, the plugs 2 are all integrally molded products made of elastic synthetic resin material, but the mounting portion 22 and the annular flange 23 are made of a hard resin material or the like separately from the valve portion 20. It may be joined to the valve portion 20 which is elastically deformable after being molded from the non-elastic material. Further, the mounting portion 22 is the mouth portion 1 of the container body 1.
However, it may be externally fitted to the mouth portion 11 or may be screwed or bonded.

In the above-mentioned example, the stoppers 2 are all mounted in a chemical container made of a hard resin material filled with a liquid chemical 5 as a content, but it may be a liquid or a liquid such as a fluid. For example, it can be used as a packaging container for filling various cosmetics, seasonings and the like as contents. Also,
The container body 1 may be made of elastic synthetic resin,
Hard resin material or glass, metal, as in the above embodiment
Those molded from non-elastic materials such as porcelain are preferred.

Further, the stopper 2 is mounted inside the cap 13 which is an outer stopper as the inner stopper of the chemical container, but the slits 4 and 40 are closed in a natural state. Since the inside of the chemical container is kept airtight when not in use by mounting the stopper body 2, it can be used as a stopper body for a packaging container which is not covered with the cap 13 or the like on the outside.

[Brief description of drawings]

FIG. 1 is a perspective view of a chemical container to which a stopper is attached according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a state in which the chemical container of FIG. 1 is covered with a cap.

FIG. 3 is a cross-sectional view of a plug body in a natural state.

FIG. 4 is a cross-sectional view of the plug body in a pressed state.

FIG. 5 is an explanatory view showing taking out of a medicine from a medicine container.

FIG. 6 is a plan view of a stopper according to another embodiment of the present invention.

7 is a cross-sectional view taken along the line AA of FIG.

FIG. 8 is a plan view of the plug body in a pressed state.

9 is a sectional view taken along line BB of FIG.

FIG. 10 is an explanatory view showing taking out of the medicine from the medicine container.

FIG. 11 is a plan view of a stopper according to another embodiment of the present invention.

12 is a cross-sectional view taken along line CC of FIG.

FIG. 13 is a plan view showing a pressed state of the plug body.

14 is a cross-sectional view taken along the line DD of FIG.

FIG. 15 is a cross-sectional view of a stopper according to another embodiment of the present invention.

FIG. 16 is a perspective view of a medicine container to which a stopper according to another embodiment of the present invention is attached.

FIG. 17 is a plan view of a stopper according to another embodiment of the present invention.

18 is a sectional view taken along line EE in FIG.

FIG. 19 is a cross-sectional view of a conventional packaging container.

[Explanation of symbols]

(1) ・ ・ ・ Container body (10) ... Body (11) ・ ・ ・ Mouth (2) ・ ・ ・ Stopper (20) ・ ・ ・ Valve (21) ・ ・ ・ Peripheral wall (22) ・ ・ ・ Mounting part (24) ・ ・ ・ Top (25) ... Bent (26) ・ ・ ・ Mounting part (3) (30) ・ ・ ・ Protrusion (4) (40) ・ ・ ・ Slit (5) ・ ・ ・ Chemical

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Osamu Matsuoka             3-4-7 Doshomachi, Chuo-ku, Osaka Fujisawa             Within Pharmaceutical Industry Co., Ltd. F term (reference) 3E014 PA01 PB03 PC04 PD30 PE09                       PE17 PF06                 3E084 AA04 AA11 AB01 AB05 BA03                       CA01 CB02 CC03 DA01 DB12                       EA04 EB02 EC03 FA09 FB01                       GA01 GA08 GB01 KB01 LA17                       LA22 LB02 LD13 LG06

Claims (14)

[Claims] 1. A stopper provided with a valve mechanism which is attached to an opening of a container body of a packaging container filled with a liquid content such as a liquid or a fluid and which is naturally closed. An elastically deformable valve portion that covers the mouth portion of the container body and includes the valve mechanism, and a mounting portion that attaches the valve portion to the mouth portion in an airtight state, and the valve portion is the A plug body that is a dome shape that bulges toward the outside of the mouth portion, and that the valve mechanism is a slit portion that is formed at a position deviated from the center of the valve portion and that is closed in a natural state. 2. The stopper according to claim 1, wherein the slit portion is formed around a top portion of the valve portion. 3. A stopper provided with a valve mechanism which is attached to an opening of a container body of a packaging container filled with a liquid content such as a liquid or a fluid and which is naturally kept closed. A surface of the valve portion, which is composed of an elastically deformable valve portion that covers the mouth portion of the container body and includes the valve mechanism, and a mounting portion that attaches the valve portion to the mouth portion in an airtight state. The valve body is formed with a protrusion protruding outward, and the valve mechanism is a slit formed in the vicinity of the protrusion and closed in a natural state. 4. The plug according to claim 3, wherein the protrusion comprises a single protrusion protruding from the central portion of the valve, and the slit is concentrically formed outside the protrusion. Has been plugged. 5. The plug according to claim 3, wherein the protrusion comprises a plurality of protrusions protruding from the valve, and the slit is formed between the protrusions. 6. The stopper according to claim 5, wherein the protrusion comprises four protrusions arranged in a square shape at a predetermined interval in a central portion of the valve portion, and the slit portion of the valve portion. A plug consisting of straight slits intersecting in a cross at the center. 7. The plug according to claim 1, wherein the attachment portion includes a thick cylindrical peripheral wall portion projecting upward from an opening of the container body and the peripheral wall portion. An elastically deformable thin valve portion provided with the valve mechanism is provided at an upper end portion of the peripheral wall portion so as to cover the opening portion. There is a plug. 8. The plug according to claim 7, wherein the valve portion is arranged so that its surface does not bulge above the upper edge of the peripheral wall portion, and the valve portion has a surface. A plug body having a protrusion protruding upward from the upper edge. 9. The plug body according to claim 8, wherein the slit portion includes a plurality of slits formed at predetermined intervals along a peripheral portion of the valve portion. 10. The stopper according to claim 8 or 9, wherein the protrusion is formed in a central portion of the valve portion,
A plug body in which the valve portion is inclined downward from the central portion to the peripheral edge portion and is bent upward at the peripheral edge portion. 11. The plug according to claim 8 or 9, wherein the valve portion is curved with a predetermined radius so as to be inclined downward from the peripheral portion to the central portion. 12. The plug according to any one of claims 1 to 11, wherein the slit portion is in close contact with the outer surface side which is the surface of the valve portion, and expands inward on the inner surface side. A groove having a V-shaped cross section is formed,
Stopper. 13. A packaging container to which the stopper according to claim 1 is attached. 14. The packaging container according to claim 13, wherein the container body is formed of a hard resin material or an inelastic material.