JP7439533B2 - Spout stopper and packaging container equipped with the same - Google Patents

Description

The present invention relates to a spout plug provided at a spouting position of a packaging container.

BACKGROUND ART Containers equipped with resin spout plugs are widely used as packaging containers for fluid contents such as liquids, powders, or granules. For example, the spout plug disclosed in Patent Document 1 includes a spout body including a cylindrical portion and a partition that closes the inside of the spout body, and a cap attached to cover the spout body. The partition wall is provided with an annular thin wall portion and a pull ring. In such a spout stopper, by pulling a pull ring provided on the partition wall, the partition wall can be broken along the thin wall portion, and the partition wall can be removed from the spout body to open the stopper. Moreover, even after opening, the cap can be re-closed by attaching the cap to the spout body again.

Japanese Patent Application Publication No. 2000-296865

However, such a spout stopper requires a relatively large pulling force to break the thin wall of the partition wall, which places a heavy burden on users with weak strength, and also requires the hassle of discarding the pull ring after opening the stopper. However, there is room for improvement in terms of convenience.

The present invention has been made in view of such problems, and an object of the present invention is to provide a spout stopper that is easy to open and a packaging container using the same.

One aspect of the present invention for solving the above problems includes a cylindrical tube portion formed with an external thread, a partition wall closing the inside of the tube portion, and a flange extending outward from one end of the tube portion. It has a spout body, a cylindrical side wall with an internal thread that engages with the external thread, and a top surface that covers one end of the side wall. A spout plug is provided with a cap attached in a screwed state, and the spout body extends from the partition wall to the side opposite to the top surface of the cap, and has a generally cylindrical shape whose central axis overlaps with the central axis of the cylindrical portion. The cap includes a first cylindrical portion having a shape of 1.5 mm, and a partition side abutting portion having a plurality of first protrusions protruding from the inner circumferential surface of the first cylindrical portion. a cap-side abutting portion having a substantially cylindrical second cylindrical portion that extends and whose central axis overlaps with the central axis of the side wall; and a plurality of second protruding portions that protrude from the outer circumferential surface of the second cylindrical portion; The partition wall has an annular thin-walled part that surrounds the partition side abutting part and whose center overlaps the central axis of the cylindrical part, and the distance in the radial direction from the central axis of the cylindrical part to the tip of the first protruding part is equal to that of the side wall. is larger than the distance in the radial direction from the central axis of the side wall to the outer peripheral surface of the second cylindrical part, and smaller than the distance in the radial direction from the central axis of the side wall to the tip of the second protruding part, and the cap is attached to the spout body. In this state, the cap-side abutting part is inserted into the partition-side abutting part so that the center axis of the side wall and the center axis of the cylindrical part overlap, and the cap is screwed from the state where the cap is attached to the spout body. When rotated in the releasing direction, some of the plurality of second protrusions abut each other in the rotational direction with one of the plurality of first protrusions, and the remaining parts rotate with each of the plurality of first protrusions. The tip of the second protruding part in the radial direction contacts the planned contact area of the inner circumferential surface of the first cylindrical part without colliding in the direction, and the cap and the partition wall separate in the direction along the central axis of the cylindrical part. When the cap is further rotated with a predetermined force in the direction of unscrewing, a predetermined force is applied to the thin wall portion through the cap-side abutting portion and the partition-side abutting portion. The distance in the radial direction from the central axis of the cylindrical part to the planned contact area in a state where the thin wall part is broken due to the action of is a spout plug in which the distance from the central axis of the side wall to the tip in the radial direction of the second protrusion is less than or equal to the distance.

Another aspect of the present invention is a packaging container equipped with the above spout stopper.

According to the present invention, it is possible to provide a spout stopper that is easy to open and a packaging container using the same.

A vertical cross-sectional view of a spout plug according to an embodiment of the present invention A vertical cross-sectional view of a spout plug according to an embodiment of the present invention An enlarged sectional view of a spout plug according to an embodiment of the present invention A partial sectional view showing the positional relationship when the spout plug according to an embodiment of the present invention is opened. Partial sectional view of spout plugs according to Modifications 1 to 3 of the present invention

[Embodiment]
A spout plug 100 according to an embodiment of the present invention will be described with reference to the drawings. 1 to 3 are cross-sectional views of a spout plug 100 according to the present embodiment in which a cap, which will be described later, is attached to a spout body. 1 is a longitudinal cross-sectional view of the spout plug 100 taken along the line BB' in FIG. 2, and FIG. 2 is a cross-sectional view of the spout plug 100 taken along the line AA' in FIG. 3 is an enlarged cross-sectional view of portion C surrounded by a dotted line in FIG. 2.

The spout plug 100 includes a spout body 10 and a cap 20 screwed and attached to the spout body 10. The spout plug 100 can be opened by separating the partition wall 12, which will be described later, from the spout body 10 by rotating the attached cap 20 in the unscrewing direction. It can be re-plugged by screwing it into the main body 10. Below, as shown in FIG. 1, the side of the spout main body 10 on which the cap 20 is attached is defined as the upper side, and the opposite side is defined as the lower side, and the description will be made according to this definition. Note that the unscrewing direction is, for example, a counterclockwise direction when viewed from above, as shown by an arrow (outlined) in FIG. 2 .

(Spout body)
The plug body 10 includes a cylindrical tube portion 11 having an external thread 13 formed therein, a partition wall 12 that closes the inside of the tube portion 11, and a flange 17 extending outward from one end edge of the tube portion 11. The partition wall side abutting portion 14 is formed on the inner peripheral side of the partition wall 12. By providing the flange 17, the spout plug 100 can be attached to a container body (not shown) by welding or the like. Although the shape of the inner peripheral surface of the cylindrical portion 11 is not limited, as an example, as shown in FIG. 1, a tapered shape 11a may be formed such that the inner diameter increases toward the other end.

As shown in FIGS. 1 and 2, the partition wall 12 is provided with a thin wall portion 12a between the cylindrical portion 11 and the partition wall side contact portion 14, which causes separation (rupture) when the cap is opened. The thin portion 12a surrounds the partition wall side contact portion 14 and is formed in an annular shape whose center overlaps the central axis CL1 of the cylindrical portion 11.

The partition wall-side abutting portion 14 is provided to transmit a force that rotates the cap 20 to the partition wall 12 when a portion of a second protruding portion 26 of a cap-side contact portion 24 (described later) comes into contact with the cap when the cap is opened. The partition wall-side abutting portion 14 includes a first cylindrical portion 15 that extends from the partition wall 12 and has a substantially cylindrical shape whose central axis overlaps the central axis CL1 of the cylindrical portion 11, and a plurality of portions that protrude from the inner peripheral surface of the first cylindrical portion 15. and a first protrusion 16 .

The first cylindrical portion 15 has an inner circumferential surface that allows the second protrusion of the cap-side contact portion 24 to extend when at least a portion of the second protrusion 26 of the cap-side contact portion 24 abuts against the partition wall-side contact portion 14. It includes a contact area 15a with which the radial tip of the portion 26 comes into contact. Specific dimensions of the expected contact area 15a will be described later.

For example, as shown in FIGS. 1 and 2, four first protrusions 16 are provided on the inner circumferential surface of the first cylindrical portion 15 at intervals of 90 degrees in the circumferential direction. As an example, each of the first protrusions 16 has a convex shape extending in the extending direction of the central axis CL1 of the cylindrical portion 11, and is unscrewed from the portion that the cap side abutting portion 24 abuts. It has a contact surface 16f that is recessed in the direction.

Note that the number of first protrusions 16 is not limited as long as the force for rotating the cap 20 can be transmitted to the partition wall 12. As shown in FIG. 1, the first cylindrical portion 15 may be formed to extend from the partition wall 12 toward the lower end side (flange 17 side), and the first protrusion portion 16 may be formed to extend from the partition wall 12 toward the lower end side (flange 17 side). As long as force can be transmitted to the partition wall 12, it may be formed so as to extend toward the upper end side (the top surface portion 22 side of the cap 20).

(cap)
The cap 20 includes a cylindrical side wall 21 formed with an internal thread 23 that engages with an external thread 13 formed on the cylindrical portion 11 of the plug body 10, a top surface portion 22 that covers one end of the side wall 21, and a top surface portion. 22 and a cap-side abutting portion 24 provided at the cap-side contact portion 22 . As shown in FIG. 1, the cap 20 may further include a cylindrical inner ring 27, one end of which is covered by the top surface portion 22, on the inner peripheral side of the side wall 21. The inner ring 27 is formed such that its outer peripheral surface is in close contact with the inner peripheral surface of the cylindrical portion 11 of the plug body 10 when the cap 20 is attached to the plug body 10 . Thereby, sealing performance can be ensured even when re-plugging after separating the partition wall 12. Although the shape of the outer circumferential surface of the inner ring 27 is not limited, as an example, as shown in FIG. Good too.

The cap-side contact portion 24 is provided to transmit the force of rotation of the cap 20 to the partition wall 12 by abutting against the partition-side contact portion 14 when the cap is opened. The cap-side contact portion 24 includes a second cylindrical portion 25 that extends from the top surface portion 22 toward the partition wall 12 of the spout body 10 and has a substantially cylindrical shape whose central axis overlaps the central axis CL2 of the side wall 21; and a plurality of second protrusions 26 protruding from the outer peripheral surface of 25.

When the cap 20 is rotated in the unscrewing direction from the state where the cap 20 is attached to the spout body 10, the plurality of second protrusions 26 abut against the first protrusion 16 in the rotational direction, and the first protrusion and a second protruding portion 26b that does not abut against the portion 16. Although details will be described later, as a result, in a state where a part of the plurality of second protrusions 26 (the second protrusion part 26a) respectively abuts against one of the plurality of first protrusions 16 in the rotational direction, The remaining second protrusions 26 (second protrusions 26b) are in a state in which they do not abut against any of the plurality of first protrusions 16 in the rotational direction. The second protruding portion 26a abuts against the first protruding portion 16 of the partition wall-side abutting portion 14 in the rotational direction of the cap 20, thereby transmitting the force for rotating the cap 20 to the partition wall 12. In the spout plug 100, as an example, the second protrusion 26 includes three second protrusions 26a and one second protrusion 26b, and the second protrusion 26a and the second protrusion 26b The interval in the circumferential direction is set such that the second protrusion 26b does not abut against the first protrusion 16 when the second protrusion 26a abuts against the first protrusion 16. Hereinafter, the second protrusion 26a and the second protrusion 26b will be collectively referred to as the second protrusion 26.

As an example, the second protruding portion 26 has a convex shape extending in the extending direction of the central axis CL2 of the side wall 21, and is configured to fit into the abutting surface 16f of the partition wall side abutting portion 14. is provided with an abutting surface 26f that protrudes toward the unscrewing direction. By providing a contact surface 16f and a contact surface 26f that can be fitted to each other on the first protrusion 16 of the partition side contact part 14 and the second protrusion 26 of the cap side contact part 24, respectively, the partition wall side Since the contact portion 14 and the cap-side contact portion 24 can be brought into contact over a wide area, the force of rotation of the cap 20 can be stably transmitted to the partition wall 12. Note that since the second protrusion 26b does not abut against the first protrusion 16, the contact surface 26f may not be provided.

As shown in FIGS. 1 and 2, when the cap 20 is attached to the spout body 10, the cap-side contact portion 24 is arranged such that the central axis CL2 of the side wall 21 and the central axis CL1 of the cylindrical portion 11 overlap. It is inserted into the partition wall side abutting part 14. Further, as shown in FIG. 2, the partition wall side abutting portion 14 has a distance in the radial direction from the central axis CL1 of the cylindrical portion 11 to the tip of the first protruding portion 16 from the central axis CL2 of the side wall 21 to the second cylindrical portion. The distance in the radial direction from the central axis CL2 of the side wall 21 to the tip of the second protrusion 26 is larger than the distance in the radial direction from the outer circumferential surface of the portion 25. Thereby, as will be described later, by rotating the cap 20, the first protrusion 16 and the second protrusion 26 can come into contact with each other in the rotational direction.

In the spout plug 100, when the cap 20 is attached to the spout main body 10, as shown in FIG. There is a predetermined interval (hereinafter referred to as a free running section S) in the circumferential direction between the contact surfaces 26f of the cap side contact portions 24 adjacent in the direction. By having the idle running section S, the force that causes the cap 20 to rotate during the predetermined first angle θ1 from when the cap 20 starts rotating until the first protrusion 16 and the second protrusion 26a come into contact with each other is reduced. is not transmitted to the partition wall 12. The first angle θ1 can be, for example, about 60°.

The first attachment of the cap 20 to the plug body 10 is performed by, for example, using a plugging method in which, after positioning, the cap is driven in with a certain force in the direction in which the central axis CL1 of the cylindrical portion 11 extends, so that the inner thread 23 overcomes the outer thread 13. This can be done by letting

(About opening)
Next, opening of the spout plug 100 will be explained with reference to FIG. 4. FIG. 4 shows the first protrusion 16 of the partition side abutting part 14 and the cap side abutting part 24 of the spout stopper 100 when the cap 20 is attached to the main body 10 (FIG. 4(a)). The partition wall side abutting portion 14 and the cap side abutting portion collide with the second protruding portion 26a in the rotational direction until the fracture progresses along the entire circumference along the thin wall portion 12a ((d) in FIG. 4). FIG. 3 is a partial cross-sectional view showing the positional relationship of the contact portions 24. FIG. 4(b) and 4(c) show a state between FIG. 4(a) and FIG. 4(d).

As shown in FIG. 4(a), when the cap 20 is attached to the spout body 10, the spout plug 100 has an idle running section S in the circumferential direction between the contact surface 16f and the contact surface 26f. have. At this time, it is preferable that the outer circumferential surface of the inner ring 27 and the inner circumferential surface of the cylindrical portion 11 are in close contact with each other over the entire circumference. In this case, close contact means, for example, a state in which the protrusion 27a provided on the inner ring 27 is in contact with the inner peripheral surface of the cylindrical portion 11 over the entire circumference.

By applying a rotational force to the cap 20 in the unscrewing direction, the cap 20 starts to rotate in the unscrewing direction as shown by the arrow in FIG. 4(b). As a result, the second protrusion 26 moves within the idle running section S, but since the first protrusion 16 and the second protrusion 26a are not in contact with each other, the force applied to the cap 20 is not applied to the partition wall at this stage. It is not transmitted to the side contact portion 14.

As the cap 20 continues to rotate further and rotates by a first angle θ1 in the unscrewing direction from the state where it is attached to the spout body 10, the first protrusion 16 is removed as shown in FIG. 4(c). and the second protrusion 26a abut against each other in the rotational direction. As described above, in the state where the first protrusion 16 and the second protrusion 26a abut against each other in the rotational direction, the second protrusion 26b does not abut against the first protrusion 16 in the rotational direction. Further, at this time, the tip of the second protrusion 26 in the radial direction contacts the planned contact area 15a formed on the inner circumferential surface of the first cylindrical portion 15, and the cap 20 and the partition wall 12 Relative movement away from each other in the direction along is restricted.

The expected contact area 15a is such that the distance L1 of the inner circumferential surface of the first cylindrical portion 15 from the central axis CL1 is equal to the tip of the second protrusion 26 in the radial direction before the cap 20 is attached to the spout body 10. This is a region formed at a distance L2 or less from the central axis CL2. In order to reliably restrict the relative movement between the cap 20 and the partition wall 12, the distance L1 is preferably less than the distance L2, and it is more preferable that the difference between the distance L1 and the distance L2 is -0.2 mm or less. . For convenience, the distance L1 and the distance L2 are shown in FIG. 15 from the center axis CL1 and the distance from the center axis CL2 of the tip of the second protrusion 26 in the radial direction. The expected contact area 15a is formed only in the area that contacts the tip of the second protrusion 26 when the first protrusion 16 and the second protrusion 26a butt each other in the rotational direction. Thereby, while the second protrusion 26 moves within the idle running section S, generation of resistance force due to frictional force caused by contact between the first protrusion 16 and the second protrusion 26 can be prevented. Therefore, it is possible to suppress an increase in the force applied to the cap 20. Note that the expected contact area 15a may be formed on the inner circumferential surface of the first cylindrical portion 15 over the entire circumference.

When the cap 20 is further rotated in the unscrewing direction with a predetermined force in a state where the first protrusion 16 and the second protrusion 26a abut against each other, a predetermined force is applied to the cap-side abutting portion 24 and the partition wall-side abutment. It acts on the partition wall 12 via the section 14. As a result, the partition wall 12 is twisted in the unscrewing direction, and a twisting force acts in the circumferential direction of the thin portion 12a, causing a break 30. Specifically, since the force applied to the cap 20 is transmitted to the partition wall 12 only through the second protrusion 26a without passing through the second protrusion 26b, the thin wall portion 12a of the partition wall 12 is An imbalance in the stress distribution occurs over the rotational direction). As a result, stress concentration occurs in the thin wall portion 12a, and the stress concentration portion causes the fracture 30 to occur. In this way, in the spout stopper 100, the fracture 30 can be caused after stress concentration due to the imbalance of stress distribution occurs in the thin wall portion 12a. The force (torque) applied to the cap 20 to cause the rupture 30 can be reduced compared to the case where force is uniformly applied to the partition wall 12 by abutting against the first protrusion 16. Note that the illustrated position of the fracture 30 is only an example, and the fracture 30 may occur at other positions.

As shown in FIG. 4(d), as the rotation of the cap 20 further progresses, stress is concentrated at the end of the fractured portion of the thin walled portion 12a, and the fracture 30 progresses along the entire circumference along the thin walled portion 12a. . As described above, since the cap 20 and the partition wall 12 are restricted from moving relative to each other in the direction along the central axes CL1 and CL2, if the fracture progresses to the entire circumference of the thin wall portion 12a, the partition wall 12 is separated from the spout body 10 along with the cap 20. As a result, opening of the spout plug 100 is completed.

In this way, in the spout plug 100, opening is completed when the cap 20 is rotated and removed, so there is no need to separately remove the partition wall 12 unlike the method of opening with a pull ring. Further, since the cap 20 is easy to pinch and apply a torque to, the user can easily open the cap with less burden than pulling a pull ring to break the partition wall 12. In particular, since the second protrusion 26 is composed of the second protrusion 26a that abuts the first protrusion 16 and the second protrusion 26b that does not abut the first protrusion 16, it is difficult to rotate the cap 20. Then, stress concentration can be generated in the thin wall portion 12a, and this stress concentration portion can be used as a trigger to cause the fracture 30, thereby making it possible to further reduce the burden on the user required to open the cap.

In addition, in a state where the first protrusion 16 and the second protrusion 26a abut each other in the rotational direction, the expected contact area 15a, which is at least a part of the inner circumferential surface of the first cylindrical part 15, is connected to the second protrusion 26. By contacting the tip in the radial direction, the separated partition wall 12 can remain in the cap 20, so there is no need to discard the part of the spout plug 100 that has come off after opening. Moreover, this allows the center axis of the first cylindrical portion 15 and the center axis of the second cylindrical portion 25 to be aligned when the bottle is opened, so that when the center axes are misaligned, the first protrusion 16 becomes the second protrusion. It is possible to prevent the bottle from hitting the 26a and making it difficult to open the bottle.

Moreover, the spout plug 100 that has been opened can be re-plugged by placing the cap 20 over the cylindrical portion 11 of the spout body 10 and rotating it in the screwing direction. By re-plugging, the outer peripheral surface of the inner ring 27 and the inner peripheral surface of the cylindrical portion 11 come into close contact again over the entire circumference, so that sealing performance can be ensured at the time of re-plugging.

Further, in the spout plug 100, since a pull ring is not provided on the partition wall 12, there is a high degree of freedom in designing the position where the partition wall 12 is formed inside the cylindrical portion 11. Although the position where the partition wall 12 is formed is not particularly limited, as an example, it can be formed so as to have a distance D (see FIG. 1) from the flange 17 of 5 mm or more in the direction in which the central axis CL1 extends. By setting the interval D to 5 mm or more, it is possible to prevent the thin wall portion 12a from being damaged by ultrasonic vibrations transmitted to the partition wall 12 during ultrasonic welding in which the flange 17 is welded to the container body using ultrasonic waves. Can be suppressed. That is, according to the spout plug 100, the partition wall 12 can be made higher than the position of the partition wall in a conventional spout plug having a pull ring by at least 5 mm.

Further, by providing the interval D of 5 mm or more, the partition wall side contact portion 14 can be formed to extend long from the partition wall 12 toward the lower end, so that the partition wall side contact portion 14 and the cap side contact portion 24 in the extending direction of the central axes CL1 and CL2 can be ensured. Thereby, the amount by which the cap-side contact portion 24 is twisted due to the rotation of the cap 20 can be reduced, and torque can be efficiently transmitted to the partition wall 12.

Examples of the material of the spout body 10 include polyethylene, and examples of the material of the cap 20 include, but are not limited to, polyethylene and polypropylene.

(Modified example)
The number of second protrusions 26a and second protrusions 26b constituting the second protrusion 26 and the positions at which they are formed in the second cylindrical part 25 are such that rotation of the cap 20 will not break the thin wall part 12a. If possible, the present invention is not limited to the example of spout plug 100. In FIGS. 5A to 5C, the differences from the spout stopper 100 are in the numbers of the second protrusions 26a and the second protrusions 26b, and in the positions where these are formed. A partial sectional view of the partition side abutting part 14 and the cap side abutting part 24 of such a spout plug is shown. Below, differences between the spout plugs according to Modifications 1 to 3 and the spout plug 100 will be mainly explained.

As shown in FIG. 5A, in the spout plug according to the first modification, two second protrusions 26a and two second protrusions 26b are provided alternately in the circumferential direction. The two second protrusions 26a are provided so that the positions where they abut against the first protrusion 16 are spaced apart from each other by 180°.

As shown in FIG. 5B, in the spout plug according to the second modification, two second protrusions 26a and two second protrusions 26b are provided adjacent to each other in the circumferential direction. The two second protrusions 26a are provided so that the positions where they abut against the first protrusion 16 are spaced apart from each other by 90 degrees.

As shown in FIG. 5C, in the spout plug according to the third modification, one second protrusion 26a is formed and three second protrusions 26b are provided.

Similarly to the spout plug 100 according to the embodiment, the spout plugs according to Modifications 1 to 3 are screwed onto the cap 20 with a predetermined force with the first protrusion 16 and the second protrusion 26a abutting each other. When the thin wall portion 12a is rotated in the uncoupling direction, an imbalance in the stress distribution in the circumferential direction (rotation direction) and stress concentration due to this occur in the thin wall portion 12a, which causes a fracture 30 (not shown) to occur. be able to. In particular, in Modification 2, force acts through two adjacent second protrusions 26a, and in Modification 3, force acts through one second protrusion 26a. In the case of these spout plugs, an embodiment in which force acts through three second protrusions 26a, and a modified example 1 in which force acts through two second protrusions 26a provided at separate positions. Compared to the spout plug according to the above, since the stress distribution in the circumferential direction is more unbalanced, the concentrated stress can be increased, and the plug can be opened with a smaller torque.

Among the plurality of first protrusions 16 included in the spout stopper described above, the first protrusions 16 that do not abut against the second protrusions 26a do not have an essential shape. However, by providing the first protrusion 16 that does not abut the second protrusion 26a, when the second protrusion 26a climbs over the first protrusion 16 due to an impact force being applied to the cap 20, etc. It is preferable to provide the first protrusion 16 because it enables the rotation of the cap 20 to be stopped quickly.

Further, in the spout plug described above, in a state where a part of the plurality of second protrusions 26 abuts each other in the rotational direction with one of the plurality of first protrusions 16, the remaining second protrusions In order to achieve a state in which the portions 26 do not abut against any of the plurality of first protrusions 16 in the rotational direction, the plurality of first protrusions 16 are arranged at equal intervals in the circumferential direction, and the plurality of second protrusions 16 are arranged at equal intervals in the circumferential direction. The portion 26 is arranged to match the position of the first protrusion 16. However, if the above positional relationship can be achieved in a state where the first protrusion 16 and the second protrusion 26 butt each other, it is possible to achieve the above positional relationship by arranging the plurality of second protrusions 26 at equal intervals in the circumferential direction. , the plurality of first protrusions 16 may be arranged to match the position of the second protrusions 26.

The spout plugs according to Examples 1 to 4 and the comparative example were manufactured, and the torque (applied to the cap) required to open the spout plug and the load required to separate the separated partition wall from the cap were measured. did.

(Example 1)
As a spout plug according to Example 1, a spout plug 100 according to an embodiment shown in FIGS. 1 and 2 was manufactured. In the spout plug according to Example 1, the diameter of the inner peripheral surface of the first cylindrical portion 15 was 9.46 mm. Further, the second protrusion 26 has a width W in the circumferential direction of 4 mm, a protrusion height H from the second cylindrical part of 2 mm, and the difference between the distance L1 and the distance L2 in the expected contact area 15a is -0.4 mm. And so.

(Example 2)
As a spout plug according to Example 2, a spout plug according to Modified Example 1 shown in FIG. 5(a) was manufactured.

(Example 3)
As a spout plug according to Example 3, a spout plug according to Modified Example 2 shown in FIG. 5(b) was manufactured.

(Example 4)
As a spout plug according to Example 4, a spout plug according to Modified Example 3 shown in FIG. 5(c) was manufactured.

(Comparative example)
The spout plug according to the comparative example includes four pairs of first protrusions 16 and second protrusions 26, and each of the four second protrusions 26 abuts on one of the four first protrusions 16. A spout stopper that was otherwise the same as in Example 1 was manufactured.

Ten spout plugs according to Examples 1 to 4 and Comparative Example were each manufactured, and the torque required to open the plugs was first measured. Thereafter, a push-pull gauge was used to measure the load required to relatively move and detach the partition wall 12 separated from the spout body 10 from the cap 20 in the direction along the central axes CL1 and CL2. Table 1 shows the measured torque, load, and comprehensive evaluation results.

The spout plug can be used if the torque required to open the plug is greater than 45 N.cm and less than 50 N.cm, and the load is 10 N or more, which is enough to ensure that the partition wall remains in the cap. It was evaluated as "+". In addition, if the torque required to open the cap is greater than 40 N·cm and less than 45 N·cm, and the separation load is 10 N or more, the spout cap is evaluated as a spout cap that does not require high torque and can be opened easily. Indicated by "++". Furthermore, if the torque required to open the cap is 40 N cm or less and the separation load is 10 N or more, it is evaluated as a spout cap that has low torque and can be opened more easily, and is given a rating of "+++". Indicated.

As shown in Table 1, in the spout plugs according to Examples 1 to 4, imbalance in stress distribution occurs in the thin wall portion 12a as described above, and this causes the fracture 30 to occur. It was confirmed that the bottle can be opened with a small torque. In particular, it was confirmed that the torque reduction effect was greater in the spout plug according to Example 3, in which two second protrusions 26a were arranged adjacent to each other, and Example 4, in which there was one second protrusion 26a. It was done.

In contrast, in the spout plug according to the comparative example, since four second protrusions 26a are provided in the circumferential direction, imbalance in stress distribution does not occur in the thin wall portion 12a, and Compared to the spout plugs according to Nos. 1 to 4, a higher torque was required to open the plug.

In addition, in the spout plugs according to Examples 1 to 4 and the comparative example, in order to bring the tip of the second protrusion 26 in the radial direction into contact with the contact area 15a on the inner circumferential surface of the first cylindrical portion 15, the separated It has been confirmed that it is possible to ensure that the partition wall 12 remains within the cap 20.

The present invention is useful for packaging containers and the like.

10 Spout main body 11 Cylindrical portion 12 Partition wall 12a Thin wall portion 13 External thread 14 Partition side contact portion 15 First cylindrical portion 16 First protrusion portion 16f Contact surface 17 Flange 20 Cap 21 Side wall 22 Top surface portion 23 Internal thread 24 Cap side Contact portion 25 Second cylindrical portion 26 Second protrusion 26a Second protrusion 26b Second protrusion 26f Contact surface 27 Inner ring 28 Vibration suppressing portion 30 Breakage 100 Spout plug CL1, CL2 Central axis S Free running section

Claims (3)

a spout body having a cylindrical tube portion formed with an external thread, a partition wall closing the inside of the tube portion, and a flange extending outward from one end of the tube portion;
It has a cylindrical side wall formed with an internal thread that engages with the external thread, and a top surface portion that covers one end of the side wall, and is placed over the cylindrical portion of the plug body to connect the external thread and the internal thread. and a cap attached in a screwed state, the spout stopper comprising:
The spout body extends from the partition wall to a side opposite to the top surface portion of the cap, and includes a first cylindrical portion having a substantially cylindrical shape whose center axis overlaps with a center axis of the cylindrical portion, and an inner portion of the first cylindrical portion. a partition wall-side contact portion having a plurality of first protrusions protruding from the peripheral surface;
The cap includes a substantially cylindrical second cylindrical portion that extends from the top surface portion toward the partition wall of the spout main body, and whose center axis overlaps with the center axis of the side wall; and a second cylindrical portion that protrudes from an outer circumferential surface of the second cylindrical portion. a cap-side contact portion having a plurality of second protrusions;
The partition wall has an annular thin part that surrounds the partition wall side contact part and whose center overlaps with the central axis of the cylindrical part,
The distance in the radial direction from the central axis of the cylindrical portion to the tip of the first protrusion is greater than the distance in the radial direction from the central axis of the side wall to the outer peripheral surface of the second cylindrical portion, and smaller than the distance in the radial direction from the central axis to the tip of the second protrusion,
In a state where the cap is attached to the spout body,
The cap-side abutting portion is inserted into the partition-side abutting portion such that the central axis of the side wall and the central axis of the cylindrical portion overlap,
When the cap is rotated from the state where it is attached to the spout body in a direction to release the threaded connection,
A part of the plurality of second protrusions each abuts one of the plurality of first protrusions in the rotational direction, and the remaining part abuts each of the plurality of first protrusions in the rotational direction. without any
The radial tip of the second protruding portion contacts the planned contact area of the inner circumferential surface of the first cylindrical portion, and the cap and the partition wall separate in the direction along the central axis of the cylindrical portion. relative movement is regulated,
When the cap is further rotated with a predetermined force in the direction of releasing the screw connection, the predetermined force acts on the thin wall portion through the cap side contact portion and the partition wall side contact portion. The thin wall portion is broken, the partition wall is separated from the cylindrical portion, and the cap is opened;
In a state where the cap is not attached to the spout body,
The distance in the radial direction from the central axis of the cylindrical portion to the expected contact area is equal to or less than the distance from the central axis of the side wall to the tip of the second protrusion in the radial direction.
Spout stopper. In a state where the cap is not attached to the spout body,
The distance in the radial direction from the central axis of the cylindrical portion to the expected contact area is less than the distance from the central axis of the side wall to the tip of the second protrusion in the radial direction.
The spout plug according to claim 1. A packaging container comprising the spout stopper according to claim 1 or 2.

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