JP7259228B2 - Spout plug and packaging container with spout plug - Google Patents

Description

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

2. Description of the Related Art Packaging containers provided with spout plugs are widely used as packaging containers for contents such as liquids. This spout plug includes a plug body that is welded to the container body, and a cap that is screwed onto the plug body.

Patent Document 1 discloses a pouring device comprising a resin body to be welded to a paper container and a resin screw cap detachable from the body, wherein the body has a spout with a male screw formed on the outer circumference. and a closing plate provided inside the spout, and a pull ring provided on the closing plate. , a top plate and an inner ring.

Japanese Unexamined Patent Application Publication No. 2016-011128

The pouring device of Patent Document 1 is opened by inserting a finger into a pull ring provided in the pouring spout and pulling the pull ring to cut off the closing plate from the spout. In the method of maintaining sealing performance with a 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.

In addition, it is conceivable to increase the strength of meshing threads between the plug main body and the cap as a method of maintaining sealing performance when a pouring spout without a pull ring is employed. However, there is a problem that increasing the engagement strength of the screw threads increases the force required to open the cap. In particular, when a paper container is used, it is necessary to apply a large force (torque) to the cap while firmly pressing the container, which makes it difficult to open the cap.

INDUSTRIAL APPLICABILITY The present invention provides a spout plug and a spout capable of suppressing an increase in the force required to open the plug while ensuring high sealing performance even in a configuration in which a closure plate is not provided on the spout body. An object of the present invention is to provide a packaging container with a stopper.

One aspect of the present invention for solving the above problems is a spout plug comprising a plug main body welded to a container body and a cap screwed onto the plug main body, wherein the cap is connected to the top plate. , a side wall connected to the outer peripheral edge of the top plate and formed with internal threads on the inner peripheral surface, an inner ring provided circumferentially on the top plate, and an end portion of the side wall opposite to the top plate. It has a cylindrical band portion attached via a thin-walled portion, and one or more flaps having one end connected to the end of the band portion opposite to the thin-walled portion. a side wall, a flange extending outward from one end edge of the side wall, an external thread formed on the outer peripheral surface of the side wall, and a protrusion projecting outward from a region between the external thread and the flange on the outer peripheral surface of the side wall When the cap is screwed onto the plug main body, the outer peripheral surface of the inner ring is in close contact with the inner peripheral surface of the side wall of the plug main body, and the band portion is on the side opposite to the thin portion. One end of the flap is in close contact with the flange, and the other end of the flap is accommodated in the gap between the protrusion and the flange in a state of being folded back at the connecting portion with the band portion so as to be inclined toward the top plate . The ring has, on its outer peripheral surface, a first region having a first outer diameter and a second region having a second outer diameter whose outermost diameter is smaller than the first outer diameter. The plug main body is made of a material having a lower rigidity than the cap, and the side wall of the plug main body has a first region having a first inner diameter on the inner peripheral surface from the upper end side opposite to the container main body side. and a second region having a second inner diameter smaller than the first inner diameter, and the first region of the inner ring and the plug body at least in a state where the cap is screwed onto the plug body. The first area of the side wall of the plug body is in close contact with the entire circumference, and the second area of the inner ring and the second area of the side wall of the plug body are in close contact with each other over the entire circumference.

Another aspect of the present invention relates to a packaging container provided with the spout plug.

ADVANTAGE OF THE INVENTION According to the present invention, a spout plug capable of suppressing an increase in the force required for opening while ensuring high sealing performance even in a configuration in which a closure plate is not provided on the spout body; A packaging container with a spout plug can be realized.

Partial cross-sectional view of the spout plug according to the present embodiment Enlarged cross-sectional view of the spout plug according to the present embodiment Enlarged cross-sectional view of the spout plug according to the present embodiment A perspective view of a packaging container provided with a spout plug according to the present embodiment. A diagram for explaining the process of capping the plug body with a cap according to the present embodiment.

(spout plug)
Embodiments of the present invention will be described below. FIG. 1 is a partial cross-sectional view of the spout plug according to this embodiment. 2 and 3 are enlarged cross-sectional views of areas A and B enclosed by rectangles shown in FIG. 1, respectively. FIG. 4 is a perspective view of a packaging container provided with an outlet plug according to this embodiment.

As shown in FIGS. 1 and 4, the outlet plug 1 includes a plug body 3 attached to a container body 2 by welding or the like, and a cap 4 that can be screwed onto the plug body 3 . 1 to 4 show a state in which the cap 4 is capped on the plug main body 3. FIG. The state in which the cap 4 is capped on the plug main body 3 refers to a state in which the cap 4 is screwed onto the plug main body 3 and movement in the height direction of the cap 4 is restricted by projections 11b, which will be described later. shall be

(cap)
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 internal screw 6 a formed on the inner peripheral surface, and a cylindrical inner ring 7 provided circumferentially on the top plate 5 . and a contact ring 8 provided between the side wall 6 of the top plate 5 and the inner ring 7 . A cylindrical band portion 19 attached via a thin portion 18 is provided at the lower end portion of the side wall 6 opposite to the top plate 5 . A flap 20 connected at one end is provided at the lower end of the band portion 19 opposite to the thin portion 18 . One or more communication portions 19 a may be provided at the lower end portion of the band portion 19 to communicate the inside and the outside of the cap 4 .

The band portion 19 is a tamper evidence band that can be separated from the cap 4 by breaking the thin portion 18 when opening the cap. As an example, as shown in FIG. 3, the thin portion 18 connects the side wall 6 and the band portion 19, which are formed side by side at predetermined intervals in the circumferential direction on the inner peripheral surfaces of the side wall 6 and the band portion 19 of the cap 4. It can be composed of a plurality of ribs 18a. Although the details will be described later, the strength of the thin portion 18, which corresponds to the magnitude of the force required to open the cap, is determined by the grooves 6b (score cut portions) formed from the outer peripheral surface of the cap 4 toward the ribs 18a during the capping process. etc.) to adjust the thickness of the rib 18a in the radial direction. The groove 6b can be formed in the circumferential direction as shown in FIG.

The flap 20 is a member for breaking the thin-walled portion 18 and leaving the band portion 19 on the plug main body 3 or the cap 4 by contacting a projection portion 11b to be described later when the plug is opened. One or more flaps 20 can be provided at the lower end of the band portion 19 at predetermined intervals in the circumferential direction. By providing a plurality of flaps 20, it is possible to reduce (disperse) the repulsive force when attaching (setting) the cap 4 to the plug body 3 by screwing or the like before use.

The communication part 19a is a notch part for dividing the band part 19, and discharges the cooling water that has entered the gap between the cap 4 and the plug body 3 from the gap between the cap 4 and the plug body 3. It is a hole for Cooling water is a liquid that is showered into the container body 2 to cool the contents when the container body 2 is filled with high-temperature contents. By providing the communication portion 19a, contamination of the upper end portion and the inside of the plug body 3 by the cooling water can be prevented. Note that the communicating portion 19a is not necessarily provided.

(Mouth plug body)
The plug main body 3 includes a cylindrical side wall 11 , a flange 17 extending outward from one end edge of the side wall 11 , an external thread 11 a formed on the outer peripheral surface of the side wall 11 , and an outer peripheral surface of the side wall 11 . and a projection 11b projecting outwardly from the area between the screw 11a and the flange 17;

The flange 17 serves as a joint when attaching the plug main body 3 to the container main body 2 . As shown in FIGS. 1 and 3, the flange 17 may have a greater thickness in the vicinity of the side wall 11 than in other portions so as to be in close contact with the band portion 19 . For joining the flange 17 and the container body 2, well-known techniques such as ultrasonic welding and adhesion can be used.

The projecting portion 11b is a portion that contacts the flap 20 when the cap is opened. The protruding portion 11b can be formed in the circumferential direction on the outer peripheral surface of the side wall 11, and may be formed continuously as long as it can contact the flap 20 to restrict the movement of the band portion 19. , may be intermittently formed at predetermined intervals.

(About capping state)
As shown in FIGS. 1 to 3, the outer peripheral surface of the inner ring 7 is in close contact with the inner peripheral surface of the side wall 11 of the plug main body 3 when the cap 4 is capped on the plug main body 3 . In addition, the band portion 19 is in close contact with the flange 17 at its lower end. Further, the other end of the flap 20 is accommodated in the space between the projection 11b and the flange 17 in a state of being folded back at the connecting portion with the band portion 19 so as to face the top plate 5 .

It is preferable that the strength of adhesion between the outer peripheral surface of the inner ring 7 and the inner peripheral surface of the side wall 11 of the plug body 3 is such that the contents of the container body 2 do not leak out from between the contact surfaces. Further, the adhesion strength between the band portion 19 and the flange 17 is such that the cap 4, which is capped between the band portion 19 and the flange 17, does not rotate due to vibration or the like in the distribution process and the screwing is not loosened. It is preferable that the strength be such that a frictional force is generated.

By bringing the outer peripheral surface of the inner ring 7 and the inner peripheral surface of the plug main body 3 into close contact with each other in this manner, it is possible to ensure high sealing performance even in a configuration in which the plug main body 3 is not provided with a closing plate. . Further, since the lower end of the band portion 19 is in close contact with the flange 17, it is possible to prevent loosening of the cap 4 in the capped state due to the frictional force generated between the cap 4 and the flange 17. Furthermore, the other end of the flap 20 is accommodated in the gap between the protrusion 11b and the flange 17, thereby restricting the movement of the cap 4 in the height direction. It is possible to suppress a decrease in the adhesion strength with the inner peripheral surface of the plug body 3 . Therefore, it is possible to ensure high sealing performance even in a configuration in which the closure plate is not provided on the plug body.

(shape of inner ring and side wall)
In spout plug 1, in order to increase the adhesion strength between the outer peripheral surface of inner ring 7 and the inner peripheral surface of side wall 11 of plug main body 3, as shown in FIG. A first region 9 having a first outer diameter and a second region 10 having a second outer diameter whose outermost diameter is smaller than the first outer diameter are provided over the circumference from the top plate 5 side. , a first region 12 having a first inner diameter and a first inner diameter smaller than the first inner diameter, extending from the upper end side opposite to the container body 2 side over the entire inner peripheral surface of the side wall 11 of the plug body 3 . and a second region 13 having a second inner diameter.

1 and 2, when the cap 4 is capped on the plug main body 3, the first region 9 of the inner ring 7 and the first region 12 of the side wall 11 of the plug main body 3 are separated from each other. , and the second region 10 of the inner ring 7 and the second region 13 of the side wall 11 of the plug body 3 can be brought into close contact over the entire circumference.

Further, in a state where the cap 4 is capped on the plug main body 3 , a predetermined portion 14 of the inner peripheral surface of the side wall 6 of the cap 4 and a predetermined portion 15 of the outer peripheral surface of the side wall 11 of the plug main body 3 are covered with the cap 4 . It can also be adhered over the entire length. The predetermined portion 14 is a portion on the inner peripheral surface of the side wall 6 of the cap 4 between the connecting portion between the side wall 6 and the top plate 5 and the end of the inner screw 6a on the top plate 5 side. The predetermined portion 15 is a portion between the upper end portion of the side wall 11 on the side opposite to the flange 17 and the upper end portion of the external screw 11a. Furthermore, when the cap 4 is screwed onto the plug body 3 , the contact ring 8 of the cap 4 and the upper end of the side wall 11 of the plug body 3 are in close contact with each other.

That is, in a state in which the cap 4 is capped on the plug body 3 , the cap 4 and the plug body 3 are placed at the point of contact between the first region 9 of the inner ring 7 and the first region 12 of the plug body 3 . , contact points between the second region 10 of the inner ring 7 and the second region 13 of the plug body 3, contact points between a predetermined portion 14 of the cap 4 and a predetermined portion 15 of the plug body 3, and contacts Four contact points between the ring 8 and the upper end of the side wall 11 of the plug body 3 can be brought into close contact with each other, thereby ensuring high sealing performance.

Further, in the state where the cap 4 is capped on the plug body 3, as shown in FIG. The inner ring 7 and the side wall 11 of the plug body 3 are placed together so that a space 16 is formed between the second region 10 of the inner ring 7 and the region where the second region 13 of the plug body 3 is in close contact. may be formed. By creating the space 16, it is possible to provide two regions in which the inner peripheral surface of the inner ring 7 and the outer peripheral surface of the side wall 11 of the plug main body 3 are in close contact with each other over the entire circumference.

The plug body 3 may be made of a material having lower rigidity than the cap 4 in order to increase the strength of adhesion between the plug body 3 and the cap 4 . Examples of the material of the plug main body 3 include low-density polyethylene and linear low-density polyethylene, and examples of the material of the cap 4 include polypropylene. It is not limited to these. Further, on the condition that the plug main body 3 is made of a material having lower rigidity (bending elastic modulus) than the cap 4, the bending elastic modulus of the material of the plug main body 3 is set to 100 MPa or more and 1200 MPa or less. The bending elastic modulus is preferably 1000 MPa or more and 2100 MPa or less.

(capping process)
Next, the process of capping the cap 4 onto the plug main body 3 will be described with reference to FIG. FIGS. 5(a) to 5(d) are diagrams for explaining the process of capping the plug body with a cap according to this embodiment. 5A to 5D are enlarged views of areas corresponding to area A (left figure) and area B (right figure) enclosed by rectangles shown in FIG. 1, respectively.

As will be described later, the thin portion 18 of the cap 4 is formed by providing the groove 6b after the cap 4 is attached to the plug main body 3. As shown in FIG. 5(a) to 5(c), the cap 4 does not have a structure corresponding to the thin portion 18 and the band portion 19. It is indicated as part formation scheduled part 19'.

In the following description, the cap 4 having the first region 9 and the second region 10 and the plug main body 3 having the first region 12 and the second region 13 are used. The shape of the cap 4 and the plug body 3 is not limited as long as the outer peripheral surface of the inner ring 7 is in close contact with the inner peripheral surface of the side wall 11 of the plug body 3 in the screwed state.

First, as shown in FIG. 5A, the upper end portion of the side wall 11 of the plug main body 3 is inserted into the side wall 6 of the cap 4 . When the cap 4 is rotated in the closing direction, the cap 4 moves downward, and at the lower end, the flap 20 begins to ride on the protrusion 11b in a folded state at the connecting portion with the band portion forming portion 19'. A portion of the upper end side of the side wall 11 of the plug 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 plug body 3 . Further, the second region 10 of the inner ring 7 and the inner peripheral surface of the side wall 11 of the plug 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 plug body 3 The predetermined portion 15 and the upper ends of the contact ring 8 and the side wall 11 of the plug body 3 are also not in contact with each other.

Further rotation of the cap 4 in the closing direction causes the flap 20 to move downward on the protrusion 18 at the lower end of the side wall 6 of the cap 4, as shown in FIG. 5(b). Also, the first region 9 of the inner ring 7 pushes the side wall 11 of the plug body 3 outward and contacts the inner peripheral surface of the side wall 11 of the plug body 3 . At this time, the second region 10 of the inner ring 7 and the inner peripheral surface of the side wall 11 of the plug main 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 plug main body 3 are formed. and the upper ends of the side walls 11 of the contact ring 8 and the plug body 3 are not in contact with each other. At this time, the first region 9 of the inner ring 7 pushes outward the inner peripheral surface of the side wall 11 of the plug body 3 that contacts the first region 9 of the inner ring 7 .

Further rotation of the cap 4 in the closing direction causes the flap 20 to move further downward on the projection 18 at the lower end of the side wall 6 of the cap 4, as shown in FIG. 5(c). Also, the second region 10 of the inner ring 7 pushes the side wall 11 of the plug body 3 outward and contacts the inner peripheral surface of the side wall 11 of the plug body 3 . Also, the first region 9 of the inner ring 7 pushes the side wall 11 of the plug body 3 further outward. At this time, a predetermined portion 14 of the inner peripheral surface of the side wall 6 of the cap 4, a predetermined portion 15 of the outer peripheral surface of the side wall 11 of the plug body 3, and the upper end of the contact ring 8 and the side wall 11 of the plug body 3 are not in contact with each other. At this time, the second region 10 of the inner ring 7 pushes outward the inner peripheral surface of the side wall 11 of the plug body 3 that contacts the second region 10 of the inner ring 7 .

Thereafter, the cap 4 is further rotated in the closing direction so that the lower end of the portion 19' to be formed into the band portion is brought into contact with the flange 17 and brought into close contact with the flange 17. As a result, as shown in FIG. At the lower end, the flap 20 climbs over the projection 11b in a state of being folded back at the connecting portion with the band portion forming portion 19', and the cap 4 is capped on the plug main body 3. As shown in FIG. As a result, the other end of the flap 20 is accommodated in the space between the protrusion 11b and the flange 17 in a state of being folded back at the connecting portion with the band portion forming portion 19' so as to face the top plate 5. . Note that (d) in FIG. 5 is the same as in FIG.

Further, when the lower end of the portion 19' to be formed with the band portion is brought into contact with the flange 17 so as to be in close contact with the flange 17, the side wall 6 of the cap 4 momentarily slightly tilts inward at the central portion in the height direction. bend. As a result, the flap 20 tilts inward, that is, toward the gap between the projection 11b and the flange 17. As shown in FIG. For this reason, the other end of the flap 20 that has climbed over the protrusion 11b can be quickly accommodated in the gap between the protrusion 11b and the flange 17, and the flap 20 is caught by the protrusion 11b, causing the protrusion 11b to move. and the flange 17 from becoming unaccommodated.

In addition, the first region 9 of the inner ring 7 and the first region 12 of the side wall 6 of the plug 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 plug body 3 are in close contact with each other. and the second region 13 of the cap 4 are in tight contact over the entire circumference, and a predetermined portion 14 of the inner peripheral surface of the side wall 6 of the cap 4 and a predetermined portion 15 of the outer peripheral surface of the side wall 11 of the plug body 3 are in close contact over the entire periphery. Then, the contact ring 8 and the upper end of the side wall 11 of the plug main body 3 are brought into close contact with each other.

Furthermore, the thin portion 18 is formed in a state in which the lower end portion of the band portion forming portion 19 ′ of the cap 4 is brought into close contact with the flange 17 . Specifically, as shown in FIG. 5(d), a plate-shaped score cutter 50 is applied from the outside to the side wall 6 of the cap 4 in close contact with the flange 17 so as to be perpendicular to the height direction of the cap 4. A groove 6b having a predetermined depth from the outer peripheral surface of the side wall 6 is formed in the circumferential direction. The depth of the groove 6b (that is, the thickness of the rib 18a in the radial direction) can be adjusted according to the force that breaks the thin portion 18 in the opening process described below.

At this time, since the lower end of the portion 19' to be formed with the band portion is in close contact with the flange 17, when the score cutter 50 comes into contact with the side wall 6, the pressing force of the score cutter 50 causes the cap 4 to move, deformation can be suppressed. Thereby, the depth and shape of the formed groove 6b can be stably formed.

When the cap 4 is capped on the plug main body 3, the distance L in the height direction of the cap 4 between the other end of the flap 20 and the protrusion 11b (see the right diagram of FIG. 5(d)) is 0.5. It is preferable to make it 1 mm or more and 0.3 mm or less. By setting the distance L to 0.1 mm or more, it is possible to prevent the flap 20 that has climbed over the protrusion 11b from being caught by the protrusion 11b and not being accommodated in the gap between the protrusion 11b and the flange 17. . Further, by setting the distance L to 0.3 mm or less, even when the cap 4 is loosened by vibration or the like and rotated in the opening direction, it can be brought into contact with the projecting portion 11b promptly unless the thin portion 18 is broken. Therefore, the amount of upward movement of the cap 4 is kept small, and the tight contact between the inner ring 7 and the side wall 6 of the plug main body 3 can be maintained. Also, preferably, the cap 4 is loosened from the capped state of the plug main body 3, the cap 4 rotates in the opening direction, and the other end of the flap 20 and the protrusion 11b come into contact with each other. Also, as long as the thin portion 18 is not broken, the first region 9 of the inner ring 7 and the first region 12 of the side wall 11 of the plug body 3, the second region 10 of the inner ring 7 and the side wall of the plug body 3 Preferably, all of the second regions 13 of 11 are in contact to maintain a high seal.

In the spout plug 1, the force (frictional force between the band portion 19 and the flange 17) that suppresses screw loosening and ensures sealing performance can be adjusted by the tightening torque in the capping process.

(Opening process)
When opening the capped outlet plug 1, the capped cap 4 is first rotated in the opening direction. As a result, the cap 4 moves above the plug main body 3 while rotating. When the cap 4 moves upward by the distance L, the other end of the flap 20 comes into contact with the projection 18 and the upward movement of the band 19 is restricted.

When the cap 4 is further rotated in the opening direction and moved upward, the thin portion 18 is pulled vertically between the band portion 19 whose movement is restricted and the side wall 6 of the cap 4, and is broken. As a result, the band portion 19 is separated from the lower end of the side wall 6 . The spout plug 1 can be opened by further turning the cap 4 from which the band portion 19 has been detached in the opening direction and removing it from the spout main body 3 .

Since the magnitude of the force (torque) applied to the cap 4 when breaking the thin portion 18 to open the cap 4 is determined by the thickness of the thin portion 18 in the radial direction, the depth of the groove 6b formed by the score cutter 50 can be adjusted by The magnitude of the force at this time is preferably strong enough not to break due to tightening torque in the capping process.

In spout plug 1, looseness is suppressed by the frictional force between band portion 19 and flange 17 to ensure high sealing performance. For this reason, there is a momentary torque that overcomes the frictional force only at the start of opening, but a large force is not required in subsequent rotations. Therefore, it is possible to suppress an increase in the force required for opening the cap.

The spout plug and the packaging container provided with the spout plug according to the present invention are suitably used, for example, as a spout plug provided on a packaging container containing a content such as a liquid or a packaging container provided with the spout plug.

1 spout plug 2 container main body 3 spout main body 4 cap 5 top plate 6 side wall 6a internal screw 6b groove 7 inner ring 8 contact ring 9 first area 10 second area 11 side wall 11a external screw 11b protrusion 12 first region 13 second region 14 predetermined portion 15 predetermined portion 16 space 17 flange 18 thin portion 19 band portion 19a communicating portion 20 flap 50 score cutter

Claims (6)

A spout plug comprising a spout body welded to a container body and a cap screwed onto the spout body,
The cap includes a top plate, a side wall connected to the outer peripheral edge of the top plate and having an internal thread formed on the inner peripheral surface, an inner ring provided circumferentially on the top plate, and the top of the side wall. A cylindrical band portion attached via a thin portion provided at the end opposite to the plate, and one or more flaps having one end connected to the end of the band portion opposite to the thin portion. and
The plug body includes a cylindrical side wall, a flange extending outward from one end edge of the side wall, an external thread formed on the outer peripheral surface of the side wall, and the external thread on the outer peripheral surface of the side wall. a projection projecting outward from the region between the flange,
In a state where the cap is screwed onto the plug body,
The outer peripheral surface of the inner ring is in close contact with the inner peripheral surface of the side wall of the plug body,
the band portion is in close contact with the flange at an end opposite to the thin portion;
the other end of the flap is accommodated in the gap between the protrusion and the flange in a state of being folded back at the connecting portion with the band portion so as to be inclined toward the top plate;
The inner ring has, on its outer peripheral surface, a first region having a first outer diameter and a second outer diameter having an outermost diameter smaller than the first outer diameter. having a region and
the plug body is made of a material having lower rigidity than the cap,
The side wall of the plug body has a first region having a first inner diameter and a second inner diameter smaller than the first inner diameter on the inner peripheral surface from the upper end side opposite to the container body side. and a second region having
At least in a state where the cap is screwed onto the plug body,
the first region of the inner ring and the first region of the side wall of the plug body are in close contact over the entire circumference;
A spout plug, wherein the second region of the inner ring and the second region of the side wall of the plug body are in close contact 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 plug body are in close contact over the entire circumference,
A region where the first region of the inner ring and the first region of the side wall of the plug body are in close contact with each other, and the second region of the inner ring and the second region of the side wall of the plug body. 2. The spout plug of claim 1, having a space between the regions and the coherent regions. In a state in which the cap is loosened from being screwed to the plug body, and the other end of the flap and the protrusion are in contact with each other,
the first region of the inner ring and the first region of the side wall of the plug body are in close contact over the entire circumference;
the second region of the inner ring and the second region of the side wall of the plug body are in close contact 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 plug body are in close contact over the entire circumference,
A region where the first region of the inner ring and the first region of the side wall of the plug body are in close contact with each other, and the second region of the inner ring and the second region of the side wall of the plug body. 3. The spout plug according to claim 2, having a space between the regions and the coherent regions. 3. The band portion has one or more communicating portions which are formed from an end opposite to the thin portion to an end on the side of the thin portion and communicate between the inner side and the outer side. The spout plug according to any one of . In a state where the cap is screwed onto the plug body,
The spout plug according to any one of claims 1 to 4, wherein the distance in the height direction of the cap between the other end of the flap and the projection is 0.1 mm or more and 0.3 mm or less. A packaging container comprising the outlet plug according to any one of claims 1 to 5.

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