JP7087774B2 - Packaging container with spout plug and spout plug - Google Patents

Description

The present invention relates to a packaging container provided with a spout plug and a spout plug.

As a packaging container for contents such as liquids, a packaging container provided with a spout plug is widely used. This spout / outlet plug includes a spout body that is welded to the container body and a cap that is screwed to the spout body.

Patent Document 1 describes a pouring device provided with a resin main body welded to a paper container and a removable resin screw lid on the main body. It has a closing plate provided inside the spout and a pull ring provided on the closing plate. , It is described that it has a top plate and an inner ring.

Japanese Unexamined Patent Publication No. 2016-011128

The dispensing device of Patent Document 1 is opened by inserting a finger into a pull ring provided at the spout, pulling the pull ring, and cutting the closing plate from the spout. In the method of maintaining the sealing property by the closing plate, it was difficult to open the package depending on the size of the pull ring provided on the closing plate, and it took time and effort to pull out the pull ring.

It is an object of the present invention to provide a packaging container provided with a spout plug and a spout plug capable of ensuring high sealing performance even if the spout main body is not provided with a closing plate.

The present invention relates to a spout plug having a spout body welded to the container body and a cap screwed to the spout body, and the cap is connected to the top plate and the outer peripheral edge of the top plate. It has a side wall having an inner thread formed on the inner peripheral surface and an inner ring provided in a circumferential shape on the inner surface of the top plate, and the inner ring has a first outer ring on the outer peripheral surface from the top plate side. The spout body has a first region having a diameter and a second region having a second outer diameter whose outermost diameter is smaller than the first outer diameter, and the spout body has an outer screw formed on the outer peripheral surface. It is made of a material that has a side wall and is less rigid than the cap, and the side wall of the spout body has a first region having a first inner diameter on the inner peripheral surface from the upper end side opposite to the container body side. The first region of the inner ring and the spout body, in a state where the innermost diameter has a second area having a second inner diameter smaller than the first inner diameter and the cap is screwed to the spout body. The first region of the side wall is in close contact over the entire circumference, the second region of the inner ring and the second region of the side wall of the spout body are in close contact over the entire circumference, and a predetermined value of the inner peripheral surface of the side wall of the cap is in close contact. The portion and the predetermined portion of the outer peripheral surface of the side wall of the spout body are in close contact with each other over the entire circumference, and the area where the first region of the inner ring and the first region of the side wall of the spout body are in close contact with each other and the inner ring. There is a space between the second region of the mouthpiece and the region where the second region of the side wall of the spout body is in close contact.

Further, the cap further has a contact ring between the side wall of the top plate and the inner ring, and the contact ring and the upper end of the side wall of the spout body are in close contact with each other when the cap is screwed to the spout body. Is preferable.

Further, in the process of attaching the cap to the spout body and rotating it in the closing direction, the first region of the inner ring pushes the side wall of the spout body outward and comes into contact with the inner peripheral surface of the side wall of the spout body. After that, the second region of the inner ring pushes the side wall of the spout body further outward to come into contact with the inner peripheral surface of the side wall of the spout body, and then the cap is screwed to the spout body. Is preferable.

Further, when the cap is removed from the spout body, the difference between the first outer diameter of the inner ring and the first inner diameter of the side wall of the spout body is the difference between the second outer diameter of the inner ring and the mouth. It is preferably larger than the difference from the second inner diameter of the side wall of the plug body.

Further, when the cap is removed from the spout body, the difference between the first outer diameter of the inner ring and the first inner diameter of the side wall of the spout body is 0.30 mm or more and 0.50 mm or less, and the inner diameter. The difference between the second outer diameter of the ring and the second inner diameter of the side wall of the spout body is 0.10 mm or more and 0.30 mm or less, and the inner diameter of a predetermined portion of the inner peripheral surface of the side wall of the cap and the mouth. It is preferable that the difference from the outer diameter of the predetermined portion of the outer peripheral surface of the side wall of the stopper body is 0.20 mm.

Further, the thickness of the inner ring in the first region is thicker than the thickness in the first region of the side wall of the spout body, and the thickness in the second region of the inner ring is the thickness in the second region of the side wall of the spout body. It is preferable that it is thinner than the thickness in.

The present invention also relates to a packaging container provided with the above-mentioned spout plug.

According to the present invention, it is possible to realize a packaging container provided with a spout plug and a spout plug capable of ensuring high sealing performance even if the spout main body is not provided with a closing plate.

Cross-sectional view of the spout plug according to this embodiment Perspective view of the packaging container provided with the spout plug according to the present embodiment. The figure explaining the process of screwing a cap to a spout main body which concerns on this embodiment. Schematic diagram of the cross section of the cap and the cross section of the spout body overlapped

(Composition of spout plug)
Hereinafter, embodiments of the present invention will be described. FIG. 1 is a cross-sectional view of a spout plug according to the present embodiment. 1 (a) is a cross-sectional view of a spout plug, and FIG. 1 (b) is an enlarged view of a region surrounded by a rectangle shown in FIG. 1 (a). FIG. 2 is a perspective view of a packaging container provided with a spout plug according to the present embodiment. As shown in FIGS. 1 (a), 1 (b) and 2, the spout plug 1 includes a spout body 3 welded to the container body 2 and a cap 4 screwed to the spout body 3. To prepare for. The cap 4 includes a top plate 5, a side wall 6 connected to the outer peripheral edge of the top plate 5 and having an inner screw formed on the inner peripheral surface, an inner ring 7 provided on the inner surface of the top plate 5 in a circumferential shape, and the like. It has a contact ring 8 provided between the side wall 6 of the top plate 5 and the inner ring 7. The inner ring 7 has a first region 9 having a first outer diameter and a second outer diameter having an outermost diameter smaller than the first outer diameter on the outer peripheral surface from the top plate 5 side. A region 10 is provided. The spout body 3 has a side wall 11 having an outer screw formed on the outer peripheral surface. The side wall 11 of the spout main body 3 has a first region 12 having a first inner diameter on the inner peripheral surface from the upper end side opposite to the container main body 2 side, and a second inner diameter smaller than the first inner diameter. It has a second region 13 having an inner diameter.

As shown in FIG. 1 (b), in a state where the cap 4 is screwed to the spout body 3, the first region 9 of the inner ring 7 and the first region 12 of the side wall 11 of the spout body 3 are formed. The second region 10 of the inner ring 7 and the second region 13 of the side wall 11 of the spout body 3 are in close contact with each other over the entire circumference.

Further, in a state where the cap 4 is screwed to the spout body 3, the predetermined portion 14 on the inner peripheral surface of the side wall 6 of the cap 4 and the predetermined portion 15 on the outer peripheral surface of the side wall 11 of the spout body 3 are all. It is in close contact over the circumference. The predetermined portion 14 of the inner peripheral surface of the side wall 6 of the cap 4 is a connection point between the side wall 6 and the top plate 5 on the inner peripheral surface of the side wall 6 of the cap 4, and an internal screw provided on the side of the top plate 5 most. It is a part formed between and. The predetermined portion 15 of the outer peripheral surface of the side wall 11 of the spout main body 3 is a portion formed between the upper end of the side wall 11 opposite to the container main body 2 side and the external screw provided on the uppermost end side. Further, in a state where the cap 4 is screwed to the spout body 3, the contact ring 8 of the cap 4 and the upper end of the side wall 11 of the spout body 3 are in close contact with each other.

That is, in a state where the cap 4 is screwed to the spout main body 3, the contact point between the first region 9 of the inner ring 7 and the first region 12 of the side wall 11 of the spout main body 3, the first inner ring 7. The contact point between the region 10 of 2 and the second region 13 of the side wall 11 of the spout body 3, the predetermined portion 14 of the inner peripheral surface of the side wall 6 of the cap 4, and the predetermined portion of the outer peripheral surface of the side wall 11 of the spout body 3. The container body 2 is sealed because the contact points with the portion 15 and the contact points between the contact ring 8 and the upper end of the side wall 11 of the spout main body 3 are in close contact with each other.

Further, in a state where the cap 4 is screwed to the spout main body 3, the region where the first region 9 of the inner ring 7 and the first region 12 of the side wall 11 of the spout main body 3 are in close contact with each other and the inner ring 7 A space 16 is provided between the second region 10 of the above and the region where the second region 13 of the side wall 11 of the spout body 3 is in close contact with each other. By having the space 16, it is possible to provide two regions that are surely in close contact with each other over the entire circumference on the inner peripheral surface of the inner ring 7 and the outer peripheral surface of the side wall 11 of the spout main body 3.

The spout body 3 is made of a material having a lower rigidity than the cap 4. Examples of the material of the spout body 3 include low-density polyethylene or linear low-density polyethylene, and examples of the material of the cap 4 include polypropylene, but the materials of the spout body 3 and the cap 4 include. Not limited to these. Further, on the condition that the spout main body 3 is made of a material having a lower rigidity (bending elastic modulus) than the cap 4, the flexural modulus of the material of the spout main body 3 is 100 MPa or more and 1200 MPa or less, and the cap 4 is used. The flexural modulus of the material is preferably 1000 MPa or more and 2100 MPa or less.

The side wall 11 of the spout body 3 has a flange 17 extending outward at the lower end edge. The flange 17 is a joint between the container body 2 and the spout body 3 attached to the container body 2.

(Explanation of the process of screwing the cap to the main body of the spout)
Hereinafter, the process of screwing the cap 4 to the spout body 3 and the sealed state of the container body 2 will be described with reference to FIGS. 3 and 4. 3 (a) to 3 (d) are views for explaining the process of screwing the cap to the spout main body according to the present embodiment. 3 (a) to 3 (d) are enlarged views of a region corresponding to a region surrounded by a rectangle shown in FIG. 1 (a), respectively. FIG. 4 is a schematic view in which the cross section of the cap and the cross section of the spout body are overlapped. FIG. 4 is a diagram in which the cross sections of the cap and the spout body in a state where the cap is removed from the spout body are superimposed, and is a schematic view of a region corresponding to the region surrounded by the rectangle shown in FIG. 1 (a). be. For ease of understanding, the cross section of the cap 4 is hatched, and the cross section of the spout body 3 is not hatched.

In order to screw the cap 4 to the spout body 3, first, as shown in FIG. 3A, the upper end portion of the side wall 11 of the spout body 3 is inserted into the inside of the side wall 6 of the cap 4. When the cap 4 is attached to the spout body 3 and rotated in the closing direction, a part of the upper end side of the side wall 11 of the spout body 3 is inserted between the side wall 6 of the cap 4 and the inner ring 7. At this time, the first region 9 of the inner ring 7 is not in contact with the inner peripheral surface of the side wall 11 of the spout main body 3. Further, the second region 10 of the inner ring 7, the inner peripheral surface of the side wall 11 of the spout body 3, the predetermined portion 14 of the inner peripheral surface of the side wall 6 of the cap 4, and the outer peripheral surface of the side wall 11 of the spout body 3. The predetermined portion 15 and the upper end of the side wall 11 of the contact ring 8 and the spout body 3 are also not in contact with each other.

After that, when the cap 4 is further rotated in the closing direction, as shown in FIG. 3B, the first region 9 of the inner ring 7 pushes the side wall 11 of the spout body 3 outward to push the side wall 11 of the spout body 3 outward. It comes into contact with the inner peripheral surface of the side wall 11 of 3. At this time, the second region 10 of the inner ring 7, the inner peripheral surface of the side wall 11 of the spout body 3, the predetermined portion 14 of the inner peripheral surface of the side wall 6 of the cap 4, and the outer peripheral surface of the side wall 11 of the spout body 3. The predetermined portion 15 and the upper end of the side wall 11 of the contact ring 8 and the spout body 3 are not in contact with each other.

As shown in FIG. 4, the first outer diameter of the first region 9 of the inner ring 7 is the first outer diameter of the inner ring 7 on the inner peripheral surface of the side wall 11 of the spout body 3 shown in FIG. 3 (b). It is larger than the inner diameter of the region in contact with the region 9. Further, as described above, the spout body 3 is made of a material having a lower rigidity than the cap 4. Therefore, when the inner ring 7 is inserted into the spout body 3, the first region 9 of the inner ring 7 comes into contact with the first region 9 of the inner ring 7, and the side wall 11 of the spout body 3 comes into contact with the inner ring 7. Push the inner peripheral surface outward.

After that, when the cap 4 is further rotated in the closing direction, as shown in FIG. 3C, the second region 10 of the inner ring 7 pushes the side wall 11 of the spout body 3 outward to push the side wall 11 of the spout body 3 outward. It comes into contact with the inner peripheral surface of the side wall 11 of 3. Further, the first region 9 of the inner ring 7 further pushes the side wall 11 of the spout main body 3 outward. At this time, a predetermined portion 14 on the inner peripheral surface of the side wall 6 of the cap 4, a predetermined portion 15 on the outer peripheral surface of the side wall 11 of the spout body 3, and the upper end of the contact ring 8 and the side wall 11 of the spout body 3 are formed. They are not in contact with each other.

As shown in FIG. 4, the second outer diameter of the second region 10 of the inner ring 7 is the second outer diameter of the inner ring 7 on the inner peripheral surface of the side wall 11 of the spout body 3 shown in FIG. 3 (c). It is larger than the inner diameter of the region in contact with the region 10. Further, as described above, the spout body 3 is made of a material having a lower rigidity than the cap 4. Therefore, when the inner ring 7 is inserted into the spout body 3, the second region 10 of the inner ring 7 comes into contact with the second region 10 of the inner ring 7, and the side wall 11 of the spout body 3 comes into contact with the inner ring 7. Push the inner peripheral surface outward.

After that, when the cap 4 is further rotated in the closing direction, the cap 4 is screwed to the spout main body 3 as shown in FIG. 3 (d). That is, the first region 9 of the inner ring 7 and the first region 12 of the side wall 6 of the spout body 3 are in close contact with each other over the entire circumference, and the second region 10 of the inner ring 7 and the side wall 11 of the spout body 3 are in close contact with each other. The second region 13 is in close contact with the entire circumference, and the predetermined portion 14 on the inner peripheral surface of the side wall 6 of the cap 4 and the predetermined portion 15 on the outer peripheral surface of the side wall 11 of the spout body 3 are in close contact with each other over the entire circumference. Then, the contact ring 8 and the upper end of the side wall 11 of the spout main body 3 are in close contact with each other. Note that FIG. 3 (d) is the same as FIG. 1 (b).

The first region 9 of the inner ring 7 pushes the side wall 11 of the spout body 3 outward in both the state of FIG. 3 (b) and the state of FIG. 3 (c), and in the state of FIG. 3 (d). It is in close contact with the first region 12 of the side wall 11 of the spout body 3 over the entire circumference. On the other hand, the second region 10 of the inner ring 7 is not in contact with the inner peripheral surface of the side wall 11 of the plug body 3 in the state of FIG. 3 (b), and the mouth is in the state of FIG. 3 (c). The side wall 11 of the plug body 3 is pushed outward, and in the state of FIG. 3D, the side wall 11 of the plug body 3 is brought into close contact with the second region 13 over the entire circumference. Therefore, as shown in FIG. 4, in a state where the cap 4 is removed from the spout body 3, the first outer diameter of the first region 9 of the inner ring 7 and the first side wall 11 of the spout body 3 The difference from the first inner diameter of the region 12 is the second outer diameter of the second region 10 of the inner ring 7 and the second inner diameter of the second region 13 of the side wall 11 of the spout body 3. Greater than the difference. With such a configuration, the side wall of the spout body 3 is secured while ensuring contact between the first region 9 and the second region 10 of the inner ring 7 and the inner peripheral surface of the side wall 11 of the spout body 3. It is possible to balance the pushing amount of the first region 9 for pushing the inner peripheral surface of 11 twice and the second region 10 for pushing the side wall 11 of the spout main body 3 once.

The difference between the first outer diameter of the inner ring 7 and the first inner diameter of the side wall 11 of the spout body 3 is the second outer diameter of the inner ring 7 and the second inner diameter of the side wall 11 of the spout body 3. The difference between the first outer diameter and the first inner diameter and the difference between the second outer diameter and the second inner diameter are 0.10 mm or more and 0 in diameter, respectively, provided that the difference is larger than the difference between the two. It is preferably .50 mm or less. As an example, the difference between the first outer diameter and the first inner diameter is 0.30 mm or more and 0.50 mm or less, and the difference between the second outer diameter and the second inner diameter is 0.10 mm or more and 0.30 mm or less. The difference between the inner diameter of the predetermined portion 14 and the outer diameter of the predetermined portion 15 can be set to 0.20 mm. By setting the difference between the first outer diameter and the first inner diameter and the difference between the second outer diameter and the second inner diameter in the above ranges, higher sealing performance can be ensured. .. The above inner diameter and outer diameter mean the inner diameter and the outer diameter in the diameter.

Here, in a state where the cap 4 is screwed to the spout body 3, the contact region between the outer peripheral surface of the inner ring 7 and the inner peripheral surface of the side wall 11 of the spout body 3 is parallel to the central axis of the cap 4. In the case of one place having a predetermined distance in the direction, a portion that is in contact with each other and a portion that is not in contact with each other may be formed in the contact region. That is, there may be a gap in the contact area, and the container body 2 may not be sealed due to the communication of the gap.

According to the spout plug 1 according to the present embodiment, the first region 9 and the second region 10 of the inner ring 7 each push the side wall 11 of the spout main body 3 outward and sandwich the space 16. It is in close contact with the second region 12 and the second region 13 of the side wall 11 of the spout body 3, respectively. As a result, it is possible to provide two regions that are in close contact with each other over the entire circumference of the outer peripheral surface of the inner ring 7 and the inner peripheral surface of the spout main body 3. Therefore, even if the spout main body 3 is not provided with a closing plate, high sealing performance can be ensured.

Further, according to the spout plug 1 according to the present embodiment, the outer peripheral surface of the inner ring 7 and the inner peripheral surface of the spout main body 3 are surely covered over the entire circumference not only before opening but also when resealing after opening. Since two close contact areas can be provided, high sealing performance can be ensured.

Further, even when the container body 2 in which the contents are stored is dropped on the floor or the like, the spout plug 1 has two regions that are securely adhered to each other over the entire circumference of the space 16. As a result, even if the content penetrates into the space 16 beyond the first contact region between the second region 10 of the inner ring 7 and the second region 13 of the side wall 11 of the spout body 3, the spout. The plug 1 further has a second contact area between the first area 9 of the inner ring 7 and the first area 12 of the side wall 11 of the spout body 3. That is, since the close contact region is doubly formed on the outer peripheral surface of the inner ring 7 and the inner peripheral surface of the side wall 11 of the spout body 3, even if the spout body 3 is not provided with a closing plate, the contents are It is possible to prevent an object from flowing out of the container body 2 beyond these close contact areas.

Further, in the process of screwing the cap 4 to the spout main body 3, after the first region 9 of the inner ring 7 and the first region 12 of the side wall 11 of the spout main body 3 are in close contact with each other, the inner ring 7 is first. The region 10 of 2 and the second region 13 of the side wall 11 of the spout main body 3 are in close contact with each other. As a result, when the space 16 is formed, air can escape from the space 16 into the container main body 2, and the amount of air staying in the space 16 is very small. Therefore, it is possible to realize a packaging container provided with a spout plug 1 having a small resistance when the cap 4 is tightened.

Also, when filled with hot contents, cooling water may be showered over the entire container to cool the contents. At that time, the showered cooling water may enter the gap between the cap 4 and the spout main body 3. According to the spout plug 1 according to the present embodiment, in a state where the cap 4 is screwed to the spout body 3, a predetermined portion 14 on the inner peripheral surface of the side wall 6 of the cap 4 and the side wall 11 of the spout body 3 The predetermined portion 15 on the outer peripheral surface of the above surface is in close contact with the entire circumference. Therefore, the cooling water that has entered through the gap between the cap 4 and the spout body 3 has penetrated beyond the contact area between the predetermined portions 14 and 15 and into the upper end portion of the spout body 3 and the inside of the spout body 3. Can not do it. As a result, it is possible to prevent the upper end portion of the spout main body 3 and the inside of the spout main body 3 from being contaminated by the cooling water.

As shown in FIG. 1B, a protrusion 18 and a groove 19 may be further provided on the upper end of the side wall 11 of the spout main body 3 to prevent dripping. The groove 19 is formed on the outer peripheral surface of the protrusion 18 on the flange 17 side. When the protrusion 18 and the groove 19 are provided, the predetermined portion 15 of the outer peripheral surface of the side wall 11 of the spout body 3 is formed between the groove 19 and the external screw provided on the uppermost end side. It is preferable to be done. As a result, it is possible to prevent the shower cooling water from adhering to the protrusion 18 and the groove 19 for preventing dripping, so that the shower adhering to the protrusion 18 and the groove 19 when the contents are poured out. It is possible to prevent the residue of the cooling water from being mixed with the contents and poured out.

Further, the protrusion 18 is formed so that the inner diameter of the protrusion 18 is larger than the inner diameter of the first region 12 of the side wall 11 and the outer diameter of the protrusion 18 is smaller than the outer diameter of the predetermined portion 15. It is possible to secure a large gap between the cap 4 and the predetermined portion 14 of the cap 4 and the first region 9. As a result, when the side wall 11 is pushed outward by the inner ring 7 in the above-mentioned screwing process, the upper end portion of the side wall 11 comes into contact with the predetermined portion 14 of the cap 4, and the rotational torque of the cap 4 increases. It is possible to prevent it from being lost.

Further, by providing the groove 19, when the upper end of the protrusion 18 comes into contact with the side wall 6 of the cap 4, the top plate 15, or the like, the protrusion 18 can be bent around the groove 19. As a result, in the screwing process, the protrusion 18 comes into contact with the side wall 6 of the cap 4, the top plate 15, and the like, so that the side wall 6 is pushed inward and pushed into the first region 9 side of the inner ring 7. Therefore, it is possible to prevent a gap from being generated between the second region 10 of the inner ring 7 and the second region 13 of the side wall 11 to reduce the sealing property.

Further, in the above-described embodiment, the spout body 3 is formed of a material having a bending elastic modulus lower than that of the cap 4, so that the side wall 11 has a structure having a lower rigidity than the inner ring 7, so that the spout body 3 is formed. Although high sealing performance could be ensured even with a configuration without a closing plate, in addition to or instead of this, the thickness of the inner ring 7 and the side wall 11 in the radial direction was appropriately set. The side wall 11 may have a lower rigidity than the inner ring 7. For example, the radial thickness of the inner ring 7 in the first region 9 can be formed to be thicker than the radial thickness in the first region 12 of the side wall 11. Further, the thickness in the radial direction in the second region 10 can be formed thinner than the thickness in the radial direction in the second region 13 of the side wall 11. As a result, even when a material having the same flexural modulus is used for the spout body 3 and the cap 4, the rigidity of the first region 12 of the side wall 6 is higher than the rigidity of the first region 9 of the inner ring 7. Can also be made smaller.

As described above, according to the packaging container provided with the spout plug and the spout plug according to the present invention, high sealing performance can be ensured even if the spout main body is not provided with a closing plate. In addition, high sealing performance can be ensured not only before opening but also when resealing after opening, and it is possible to suppress the outflow of the contents from the spout plug when the packaging container is dropped.

A tamper evidence band may be provided at the lower end of the side wall of the cap in order to provide the cap with a tamper-proof function for clarifying whether or not the first opening has been performed. As the tamper evidence band, a known one can be used.

The packaging container provided with the spout plug and the spout plug in the present invention is suitably used for, for example, a packaging container provided with a spout plug or a spout plug provided in a packaging container containing contents such as a liquid.

1 Spout plug 2 Container body 3 Mouth plug body 4 Cap 5 Top plate 6 Side wall 7 Inner ring 8 Contact ring 9 First area 10 Second area 11 Side wall 12 First area 13 Second area 14 Predetermined part 15 Predetermined part 16 Space 17 Flange 18 Protrusion 19 Groove

Claims (7)

A spout plug having a spout body welded to the container body and a cap screwed to the spout body.
The cap has a top plate, a side wall connected to the outer peripheral edge of the top plate and having an internal screw formed on an inner peripheral surface, and an inner ring provided on the inner surface of the top plate in a circumferential shape.
The inner ring has a first region having a first outer diameter and a second outer diameter having an outermost diameter smaller than the first outer diameter on the outer peripheral surface from the top plate side. Has an area and
The spout body has a side wall on which an external screw is formed on the outer peripheral surface, and is made of a material having a lower rigidity than the cap.
The side wall of the spout body has a first region having a first inner diameter on the inner peripheral surface from the upper end side opposite to the container body side, and a second inner diameter having an innermost diameter smaller than the first inner diameter. Has a second region and has
In a state where the cap is screwed to the spout body,
The first region of the inner ring and the first region of the side wall of the spout body are in close contact with each other over the entire circumference.
The second region of the inner ring and the second region of the side wall of the spout body are in close contact with each other over the entire circumference.
A predetermined portion of the inner peripheral surface of the side wall of the cap and a predetermined portion of the outer peripheral surface of the side wall of the spout body are in close contact with each other over the entire circumference.
The first region of the inner ring and the first region of the side wall of the spout body are in close contact with each other, the second region of the inner ring and the second region of the side wall of the spout body are in close contact with each other. A spout plug having a space between the area and the area in close contact with the area. The cap further has a contact ring between the side wall of the top plate and the inner ring.
The spout plug according to claim 1, wherein the contact ring and the upper end of the side wall of the spout body are in close contact with each other in a state where the cap is screwed to the spout body. In the process of attaching the cap to the spout body and rotating it in the closing direction,
The first region of the inner ring pushes the side wall of the spout body outward and comes into contact with the inner peripheral surface of the side wall of the spout body.
After that, the second region of the inner ring further pushes the side wall of the spout body outward and comes into contact with the inner peripheral surface of the side wall of the spout body.
The spout plug according to claim 2, wherein the cap is then screwed onto the spout body. With the cap removed from the spout body,
The difference between the first outer diameter of the inner ring and the first inner diameter of the side wall of the spout body is the difference between the second outer diameter of the inner ring and the first side wall of the spout body. The spout plug according to any one of claims 1 to 3, characterized in that the difference from the inner diameter of 2 is larger. With the cap removed from the spout body,
The difference between the first outer diameter of the inner ring and the first inner diameter of the side wall of the spout body is 0.30 mm or more and 0.50 mm or less.
The difference between the second outer diameter of the inner ring and the second inner diameter of the side wall of the spout body is 0.10 mm or more and 0.30 mm or less.
The spout according to claim 4, wherein the difference between the inner diameter of the predetermined portion of the inner peripheral surface of the side wall of the cap and the outer diameter of the predetermined portion of the outer peripheral surface of the side wall of the spout body is 0.20 mm. plug.
The thickness of the inner ring in the first region is thicker than the thickness of the side wall of the spout body in the first region, and the thickness of the inner ring in the second region is the thickness of the side wall of the spout body. The spout plug according to claim 1 to 5, which is thinner than the thickness in the region of. A packaging container comprising the spout plug according to any one of claims 1 to 6.

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