Stopper and packaging container

Abstract

To provide a spout and packaging container equipped with it that makes it easy to determine whether or not the product has been opened, and that minimizes the occurrence of problems during the manufacturing process. [Solution] The spout base has a substantially cylindrical base and a protrusion provided on the base, and the cap comprises a tamper band and a flap formed on the inner surface of the tamper band and engaging with the protrusion of the spout, the outer diameter of the base is larger than the inner diameter of the tamper band, and when the stopper is unopened, the distance between the base and the base-side end of the tamper band is D1, and the distance between the protrusion and the flap is D2, satisfying the conditions D1 ≥ 0.5 mm and D2 ≥ 0.5 mm, the vertical distance a from the upper end of the protrusion to the lower end of the tamper band is 0 mm or less, and the horizontal distance b from the outer surface of the protrusion to the inner surface of the tamper band is 0 mm or more and 1.0 mm or less.

Description

Technical Field

[0001] The present invention relates to a spout with a tamper-evident function and a packaging container provided with the same.

Background Art

[0002] Spouts attached to packaging containers that store liquids or the like for discharging contents, which are configured to allow confirmation of whether a cap has been opened and have a tamper-evident function, have become widespread. Such a spout is composed of, for example, a spout body having a cylindrical discharge cylinder part and a flange part, and a cap that is screwed onto the spout and has a tamper band (Patent Documents 1 and 2).

[0003] FIG. 5 is a longitudinal end view showing a schematic configuration of a conventional spout with tamper-evident performance. More specifically, FIG. 5(a) shows the state of the spout before opening, and FIG. 5(b) shows the state of the spout after opening. The cap 120 of the spout 101 with tamper-evident performance includes, for example, a cap main body 126 composed of a top surface part 121 and a skirt part 122, and a tamper band 124 connected to the hem part of the skirt part 122 via a bridge 123. A flap 125 structure is provided on the inner peripheral surface of the tamper band 124. When the spout is opened, the flap 125 engages with a protrusion 113 formed on the outer peripheral surface of the discharge cylinder part 111 of the spout 110, thereby restricting the movement of the cap 120 in the opening direction. With the protrusion 113 and the flap 125 engaged, when further force is applied to rotate the cap 120 in the opening direction, the bridge 123 connecting the tamper band 124 and the cap main body 126 is broken, and the tamper band 124 separates from the cap main body 126 (FIG. 5(b)). When the tamper band 124 is separated, a gap X' is generated between the cap main body 126 and the tamper band 124, and it is possible to determine whether or not the spout 101 has been opened based on the presence or absence of the gap.

Prior Art Documents

Patent Documents

[0004] [Patent Document 1] International Publication No. 2022 / 137974 [Overview of the project] [Problems that the invention aims to solve]

[0005] To make it easier to recognize that the stopper 101 has been opened, it is preferable to have a large gap X' between the cap body 126 and the tamper band 124. To increase the gap X', the distance the tamper band 124 can fall should be increased, that is, the distance d' between the lower end of the tamper band 124 and the base portion 114 formed on the flange portion 112 should be increased (Figure 5(a)).

[0006] However, simply increasing the spacing d' could cause problems such as line stoppages, as the flange portion 112 of other plugs 101 could get stuck in the gap corresponding to the spacing d' during the manufacturing process when the plugs 101 were being transported.

[0007] This invention has been made in view of the above problems, and aims to provide a spout and a packaging container equipped therewith that make it easy to determine whether or not the product has been opened, and that are less likely to cause problems during the manufacturing process. [Means for solving the problem]

[0008] The spout according to the present invention is a spout comprising a spout and a cap attached to the spout, wherein the spout comprises a cylindrical dispensing tube portion, a base portion connected to one end of the dispensing tube portion, and a flange portion connected to the end of the base portion opposite to the dispensing tube portion, wherein the base portion has, in order from the flange portion side, a substantially cylindrical base portion and a convex portion provided on the base portion, wherein the outer circumferential surface of the dispensing tube portion has, in order from the base portion side, a ring-shaped projection portion and a male screw formed spaced apart from the base portion, and the cap comprises a top portion, a skirt portion extending vertically from the edge of the top portion and having a female screw formed on its inner circumferential surface that engages with the male screw, and a plurality of bridges connected to the skirt portion The device comprises a tamper band connected to the spout, and a flap formed on the inner surface of the tamper band at a predetermined distance from the end opposite the skirt portion of the tamper band, which engages with a projection on the spout. The outer diameter of the base is greater than the inner diameter of the tamper band, and when the spout is unopened, the distance between the base and the base-side end of the tamper band in the axial direction is D1, and the distance between the projection and the flap is D2. The conditions D1 ≥ 0.5 mm and D2 ≥ 0.5 mm are satisfied, the vertical distance a from the upper end of the projection to the lower end of the tamper band is 0 mm or less, and the horizontal distance b from the outer surface of the projection to the inner surface of the tamper band is 0 mm or more and 1.0 mm or less.

[0009] The packaging container according to the present invention comprises a container body and the above-mentioned spout attached to the container body. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a spout and a packaging container equipped therewith that make it easy to determine whether or not the container has been opened, and that are less likely to cause problems during the manufacturing process. [Brief explanation of the drawing]

[0011] [Figure 1] Schematic perspective view of a packaging container according to an embodiment. [Figure 2] Vertical end view showing the schematic configuration of the spout according to the embodiment. [Figure 3] Schematic longitudinal section of the cap before capping. [Figure 4]Partial cross-sectional view of the protrusion and flap area where the barrier surface is formed. [Figure 5] A vertical end view showing the schematic configuration of a conventional tamper-evident stopper. [Figure 6] Partial cross-sectional view of the protrusion and flap area where no barrier surface is formed. [Modes for carrying out the invention]

[0012] [Embodiment] Figure 1 is a schematic perspective view of a packaging container according to an embodiment. Figure 2 is a longitudinal end view showing the schematic configuration of the spout according to an embodiment. More specifically, Figure 2(a) shows the spout before opening, Figure 2(b) is a magnified view of the protrusion and the area around the lower end of the tamper band in Figure 2(a), and Figure 2(c) shows the spout after opening. Figure 3 is a schematic longitudinal cross-sectional view of the cap before capping.

[0013] <Structure> (mouth plug) The spout 1 comprises a spout 10 and a cap 20, and is attached to the opening of a container body 2, for example, which is mainly made of paper. Hereafter, the container body 2 with the spout 1 attached will be referred to as a packaging container. The spout 1 according to this embodiment can be suitably used for a gable-top type packaging container as shown in Figure 1, but can also be used as appropriate for other shapes of packaging containers, such as flat-top type packaging containers. In this specification, the direction of rotation of the cap 20 when screwing the cap 20 onto the spout 10 is referred to as the closing direction. In Figure 2, the closing direction corresponds to the left direction (clockwise direction when viewed from outside the top surface 21 of the cap 20). The opening direction is the opposite direction of rotation to the closing direction.

[0014] (Spout) The spout 10 is attached to the opening of the container body 2 and is a component for dispensing the contents of the container body 2, such as liquid, to the outside. The spout 10 comprises a cylindrical dispensing tube portion 11, a base portion 14 connected to one end of the dispensing tube portion 11, and a flange portion 12 connected to the end of the base portion 14 opposite to the dispensing tube portion 11.

[0015] The spout cylinder part 11 has a cylindrical shape, and a ring-shaped protrusion 13 and a male thread 4a are sequentially formed on the outer peripheral surface thereof from one end side (the flange part 12 side). The male thread 4a is threadedly engaged with a female thread 4b formed on a cap 20 to be described later.

[0016] The protrusion 13 is provided spaced apart from the pedestal portion 14 so that a flap 25 of the cap 20 to be described later is accommodated between the pedestal portion 14 and the protrusion 13, engages with the flap 25 when the cap is opened, and restricts movement of the cap 20 in the cap opening direction. Further, it is preferable that a connection portion on the pedestal portion 14 side between the protrusion 13 and the spout cylinder part 11 is provided with a barrier surface 15 having a reverse taper shape with respect to the other end of the spout cylinder part 11. Although details will be described later, by providing the barrier surface 15, it is possible to suppress the flap 25 engaged with the protrusion 13 from being deformed horizontally when the cap is opened, and the repulsive force generated between the protrusion 13 and the spout cylinder part 11 can be increased. The angle formed by the barrier surface 15 with respect to the central axis of the spout cylinder part 11 is preferably in the range of 40° to 50° in a cross section including the central axis of the spout cylinder part 11, and more preferably 45°.

[0017] The flange part 12 is connected to one end side of the spout cylinder part 11 via the pedestal portion 14, and is welded around the opening on the inner surface of the container body 2. The flange part 12 is a flat plate-shaped member extending outward from the pedestal portion 14, and in the present embodiment, is formed to extend in a direction orthogonal to the axial direction of the spout cylinder part 11. The shape of the flange part 12 is not limited as long as it can be joined to the container body 2, and may be, for example, an annular shape. The flange part 12 and the container body 2 are joined using a known method such as welding, for example.

[0018] The pedestal portion 14 is provided between the spout cylinder portion 11 and the flange portion 12, and includes, in order from the flange portion 12 side, a substantially cylindrical base portion 14a, and a protrusion portion 14b provided on the base portion 14a. The outer diameter of the base portion 14a is configured to be larger than the inner diameter of the tamper band 24 of the cap 20 which will be described later. Further, the outer diameter of the protrusion portion 14b is configured to be smaller than the outer diameter of the base portion 14a and equal to or less than the inner diameter of the tamper band 24. At this time, it is preferable that the shortest distance D3 between the protrusion portion 14b and the tamper band 24 is configured to be equal to or less than the thickness of the flange portion 12 (Fig. 2(b)). As shown in Fig. 2, the protrusion portion 14b may be configured as an annular shape with a flat upper surface, may be configured by providing a ring-shaped member spaced apart from the spout cylinder portion 11 on the base portion 14a, or may be configured by providing a plurality of ribs extending radially from the outer peripheral surface of the spout cylinder portion 11 on the base portion 14a.

[0019] The spout 10 is formed of a material containing a thermoplastic resin such as low-density polyethylene (LDPE), for example, and can be molded by an existing molding method such as injection molding or compression molding.

[0020] (Cap) The cap 20 is a member that is detachably attached to the spout 10 by screwing, and includes a top surface portion 21, a cylindrical skirt portion 22 extending vertically from an edge of the top surface portion 21, a tamper band 24 connected to the skirt portion 22 via a plurality of bridges 23, and a flap 25 formed on the inner surface of the tamper band 24. After the bridges 23 are broken, the top surface portion 21 and the skirt portion 22 are collectively referred to as a cap main body 26, excluding the separated tamper band 24. Further, from the viewpoint of sealing performance, it is preferable that the inner surface of the top surface portion 21 is in close contact with the distal end portion of the spout cylinder portion 11 over the entire circumference. The cap 20 is made of, for example, polypropylene (PP) or the like, and in consideration of the ease of breaking the bridges 23, it is particularly preferable that the cap 20 is made of a PP block copolymer.

[0021] The inner circumferential surface of the skirt portion 22 has a female thread 4b that engages with the male thread 4a formed on the outer circumferential surface of the dispensing cylinder portion 11. Furthermore, it is preferable that the top surface portion 21 of the cap 20 has an inner ring 27 that is in close contact with the inner circumferential surface of the dispensing cylinder portion 11, and a contact ring 28 that is in contact with the other end of the dispensing cylinder portion 11. This improves the airtightness of the packaging container.

[0022] The tamper band 24 is connected to the skirt portion 22 via a plurality of bridges 23. A flap 25 is formed on the inner surface of the tamper band 24 that engages with the projection 13 of the spout 10. As will be described in detail later, the distance D1 between the end of the tamper band 24 on the base portion 14a side and the base portion 14a is D1 ≥ 0.5 mm, and more preferably D1 ≥ 1.0 mm. In addition, the vertical distance a from the upper end of the protrusion 14b to the lower end of the tamper band 24 is 0 mm or less. In this case, with respect to the upper end of the protrusion 14b, if the lower end of the tamper band 24 is on the flange portion 12 side, a will be a negative value, and if the lower end of the tamper band 24 is on the opposite side of the flange portion 12, a will be a positive value. Furthermore, the horizontal distance b from the outer surface of the protrusion 14b to the inner surface of the tamper band 24 is 0 mm or more and 1.0 mm or less, and more preferably 0 mm or more and 0.8 mm or less. In this case, with respect to the outer surface of the protrusion 14b, if the inner surface of the tamper band 24 is on the opposite side of the dispensing cylinder 11, b will be a positive value, and if the inner surface of the tamper band 24 is on the dispensing cylinder 11 side, b will be a negative value. This reduces the gap between the spout 10 and the cap 20, preventing the flange portion 12 of other stoppers 1 from entering and getting stuck in this gap when transporting the stoppers 1 during the manufacturing process, thereby reducing the risk of problems such as line stoppages. However, if b is set to less than 0 mm (making the outer diameter of the protrusion 14b larger than the outer diameter of the tamper band 24) in order to reduce the gap between the spout 10 and the cap 20, a will be 0 mm or less, which may cause interference between the upper end of the protrusion 14b and the lower end of the tamper band 24, making it difficult to set the spout 10 and the cap 20, so this is undesirable. Also, in this case, it is preferable that the shortest distance D3 between the tamper band 24 and the protrusion 14b is less than or equal to the thickness of the flange portion 12.

[0023] Multiple bridges 23 are provided to connect the skirt portion 22 and the tamper band 24, and break when the cap body 26 moves away from the tamper band 24 as the cap 20 rotates during opening. When the bridges 23 break, the cap body 26 and the tamper band 24 separate, and a gap X is formed between the skirt portion 22 and the tamper band 24 after opening (Figure 2(c)).

[0024] Each of the multiple bridges 23 is formed to span the skirt portion 22 and the tamper band 24 so as to protrude inward from the cap 20. In this case, the skirt portion 22 and the tamper band 24 are separated by a notch 29 that does not penetrate the bridge 23. Therefore, in the state before opening, no visible gap is formed between the skirt portion 22 and the tamper band 24, and the gap X after opening is formed only after opening. The notch 29 does not need to completely separate the skirt portion 22 and the tamper band 24 and penetrate the bridge 23, but it may reach, for example, near the center of the bridge 23. Such a notch 29 can be formed by a score cut. Alternatively, the bridge 23 may be formed without a score cut, leaving a slight gap between the skirt portion 22 and the tamper band 24.

[0025] The flap 25 is provided around the entire circumference of the inner surface of the tamper band 24 at a predetermined distance from the end opposite the skirt portion 22 (the lower end of the cap 20) on the inner surface of the tamper band 24. In the state before capping (the state after the cap 20 has been molded), the flap 25 is not bent, and the end of the flap 25 faces downward (towards the open end of the skirt portion 22) (Figure 3). When the cap 20 is attached to the spout 10 by pressing it in, as shown in Figure 2, the flap 25 bends near the connection point with the skirt portion 22, and the end of the flap 25 faces upward (towards the top surface portion 21), so that when opened, the end of the flap 25 can engage with the projection 13 of the spout 10. Furthermore, as will be described in more detail later, the distance D2 between the flap 25 and the protrusion 14b of the base portion 14 in the axial direction of the unopened stopper 1 is preferably D2 ≥ 0.5 mm, and more preferably D2 ≥ 1.0 mm.

[0026] The flap 25 engages with the projection 13 of the spout 10 when the cap 20 is opened, thereby restricting the upward movement of the tamper band 24 (towards the open end of the dispensing cylinder 11, and in the upward direction of the paper in Figure 1). When the cap 20 is rotated in the opening direction, the cap body 26 moves upward with the rotation, but the mechanism of the flap 25 and projection 13 restricts the movement of the tamper band 24 in the same direction. Further rotation of the cap body 26 breaks the bridge 23, separating the cap body 26 and the tamper band 24, allowing the cap 20 to be opened. In this way, by providing the cap 20 with a tamper band 24 and a flap 25, tamper-evident properties (anti-tampering function) can be given to the stopper 1.

[0027] When the cap 20 is rotated in the opening direction with the flap 25 engaged with the projection 13, the flap 25 is compressed, generating a repulsive force. When the bridge 23 breaks, the repulsive force generated in the flap 25 biases the tamper band 24 downward (towards the flange portion 12, and downward in the plane of the paper in Figure 1), pushing the tamper band 24 downward. The greater the repulsive force generated in the flap 25, the easier it is to push the tamper band 24 downward. Therefore, a sufficient gap (hereinafter referred to as gap X) can be secured between the skirt portion 22 and the tamper band 24 after opening.

[0028] To increase the repulsive force generated in the flap 25, one possible method is to shorten the length of the flap 25 and increase its rigidity. However, a highly rigid flap 25 is less likely to bend when engaged with the projection 13 and tends to deform approximately horizontally, as shown in Figure 6(b). When the flap 25 is deformed approximately horizontally, insufficient repulsive force is generated in the flap 25, the force pushing the tamper band 24 downwards weakens, and there is a risk that the gap X between the tamper band 24 and the cap 20 will narrow. Therefore, in order to suppress the deformation of the flap 25 approximately horizontally, it is preferable to form the aforementioned barrier surface 15 on the projection 13 with which the flap 25 engages (details will be described later).

[0029] Furthermore, it is preferable that notches 30 be formed at the end of the flap 25 at positions corresponding to each of the multiple bridges 23 in the state before opening (Figure 3). By providing notches 30, interference between the flap 25 and the bridges 23 can be prevented during capping, and the force required for capping can be reduced. In addition, the formation of notches 30 can suppress the formation of wrinkles on the flap 25 when the flap 25 is bent after capping (when the end of the flap 25 is facing upward). The formation of wrinkles on the flap 25 causes the flap 25 to lose its perfect circular shape, and the repulsive force generated between the flap 25 and the projection 13 cannot be evenly applied to the multiple bridges 23, making it difficult to break the bridges 23 simultaneously. If the multiple bridges 23 cannot be broken simultaneously, the force pushing down on the tamper band 24 is dispersed and weakened, and the sensation of breaking the bridges 23 is also reduced, making it difficult to get the feeling of opening.

[0030] Furthermore, it is preferable that the notch 30 is formed in a region that does not reach the base of the flap 25 from the end of the flap 25. If the notch 30 reaches the base of the flap 25, that is, if the flap 25 is divided in the circumferential direction, the base of the flap 25 is not connected, so the repulsive force between the flap 25 and the projection 13 is not transmitted evenly to the bridge 23, making it difficult for the bridge 23 to break simultaneously.

[0031] <Effects and Actions> (Base) To make it easier to determine whether a cap has been opened, it is necessary to increase the gap X between the skirt portion 22 and the tamper band 24 after opening. However, in the case of conventional caps, such as those shown in Figure 5, where the base portion 114 does not have a protrusion 14b, increasing the gap X (corresponding to gap X' in Figure 5) requires increasing the distance d' between the lower end of the tamper band 24 and the base portion 114 (Figure 5(a)). However, simply increasing the distance d' makes it easier for the flange portion of other caps to enter the gap corresponding to the distance d', which may cause problems such as production line stoppages.

[0032] On the other hand, in this embodiment, the base portion 14 comprises a base portion 14a and a protrusion 14b provided on the base portion 14a. In this case, the outer diameter of the base portion 14a is larger than the inner diameter of the tamper band 24 of the cap 20, and the outer diameter of the protrusion 14b is less than or equal to the outer diameter of the base portion 14a and the inner diameter of the tamper band 24. That is, when the tamper band 24 separates from the cap body 26, it is configured to fall until the tamper band 24 contacts the base portion 14a or the flap 25 contacts the protrusion 14b. Therefore, the distance the tamper band 24 falls, that is, the size of the gap X between the skirt portion 22 and the tamper band 24 after opening, is determined by the distance D1 between the base portion 14a and the end of the tamper band 24 on the base portion 14a side, and the distance D2 between the protrusion 14b and the flap 25, in the axial direction of the unopened stopper 1. The larger the gap X after opening, the easier it is to determine whether or not the stopper 1 has been opened. Therefore, the intervals D1 and D2 are configured to satisfy the conditions D1 ≥ 0.5 mm and D2 ≥ 0.5 mm.

[0033] Furthermore, in this embodiment, the vertical distance a from the upper end of the protrusion 14b to the lower end of the tamper band 24 is set to 0 mm or less, and the horizontal distance b from the outer surface of the protrusion 14b to the inner surface of the tamper band 24 is set to 0 mm or more and 1.0 mm or less. This prevents the flange portion 12 of the other stopper 1 from entering between the lower end of the cap 20 and the spout 10.

[0034] Thus, in this embodiment, since the spacing D1 and D2 are 0.5 mm or more, and distance a is 0 mm or less, and distance b is 0 mm or more and 1.0 mm or less, it is possible to more reliably form a gap X after opening while preventing the flange portion 12 of other stoppers 1 from entering between the spout 10 and the cap 20 during transport of stopper 1. Furthermore, by making the shortest distance D3 between the protrusion 14b and the tamper band 24 less than or equal to the thickness of the flange portion 12, the intrusion of the flange portion 12 can be more reliably suppressed.

[0035] Furthermore, the spout 1 is attached by inserting it horizontally while the opening portion, which is formed before assembly as a packaging container, is held vertically. Therefore, if the gap between the cap 20 and the base portion 14 is large, the spout 1 may shift in the direction of gravity when the cap 20 passes through the opening, and the paper around the opening may get caught in the gap. If the paper gets caught too deeply, it may cause the paper to curl or lead to poor welding between the spout 1 and the container body 2. However, in this embodiment, since the base portion 14 is provided with a protrusion 14b, the paper can be stopped by the protrusion 14b and prevented from penetrating too far (near the dispensing cylinder portion 11). Being able to stop the paper at the base portion 14 suppresses the paper from curling, and also allows the paper to return to its normal position when the welding horn holds it down during welding, thus suppressing poor welding.

[0036] (Barrier surface) Even if D1 and D2 are 0.5 mm or more, the gap X becomes small if the tamper band 24 does not reach the base portion 14 after opening. This problem is particularly likely to occur when the spout 1 is attached to the slanted surface of a gable-top type packaging container, because the direction in which the tamper band 24 falls due to gravity is not parallel to the axial direction of the spout 1, causing the tamper band 24 to get caught on the dispensing tube portion 11 of the spout 1 during its fall. For this reason, in this embodiment, it is preferable to form a barrier surface 15 on the projection 13 that engages with the flap 25 of the tamper band 24.

[0037] Figure 4 is a partial cross-sectional view of the projection and the area around the flap where a barrier surface is formed, and Figure 6 is a partial cross-sectional view of the projection and the area around the flap where a barrier surface is not formed. When a barrier surface 15 is not formed on the projection 13, when the cap 20 is rotated in the opening direction, the cap 20 moves upward as it rotates, and the flap 25 makes line contact with the projection 13 (Figure 6(a)). If the cap 20 is rotated further from this state, the contact portion of the flap 25 with the projection 13 may slide away from the base of the flap 25, and the flap 25 may deform to a nearly horizontal position (Figure 6(b)). With a flap 25 deformed to a nearly horizontal position, sufficient repulsive force is not obtained between it and the projection 13, so the force pushing the tamper band 24 downward weakens, making it difficult to get the tamper band 24 to the base 14.

[0038] On the other hand, if a barrier surface 15 is formed on the projection 13, when the cap 20 moves upward, the flap 25 makes line contact with the lower end of the barrier surface 15 (Figure 4(a)). If the cap 20 is rotated further from this state, the end face of the flap 25 makes surface contact with the barrier surface 15 (Figure 4(b)). This prevents the flap 25 from deforming horizontally any further and increases the repulsive force generated in the flap 25. A larger repulsive force can promote the stretching of the bridge 23 (Figure 4(b)), and also increases the force pushing the tamper band 24 downward, making it easier for the tamper band 24 to reach the base 14.

[0039] Furthermore, the formation of the barrier surface 15 prevents the flap 25 from becoming horizontal, even if the flap 25 is made shorter. A shorter flap 25 has higher rigidity, which increases the repulsive force of the flap 25, making it easier to reach the tamper band 24 to the base portion 14. On the other hand, a highly rigid flap 25 has the problem of being less likely to bend and more likely to deform to a nearly horizontal position when engaged with the projection 13, but as described above, forming the barrier surface 15 prevents the flap 25 from becoming horizontal.

[0040] (flap) Furthermore, it is preferable that multiple bridges 23 be able to break simultaneously when opening the bottle. When multiple bridges 23 are broken simultaneously, compared to when multiple bridges 23 are broken gradually, a downward force is generated on the tamper band 24 all at once, so the tamper band 24 can be more reliably brought to the base portion 14. In addition, the sensation of breaking the bridges 23 is also greater, making it easier to obtain a good opening sensation.

[0041] In order to break multiple bridges 23 simultaneously, the repulsive force between the flap 25 and the projection 13 must be transmitted evenly to the bridges 23. For this reason, the flap 25 is provided around the entire circumference of the inner surface of the tamper band 24.

[0042] Furthermore, if wrinkles form on the flap 25, the repulsive force will not be transmitted evenly to the bridge 23. For example, even if the flap 25 is wrinkle-free before capping (Figure 3), wrinkles may form when the flap 25 is stored between the base portion 14 and the projection portion 13 during capping. Therefore, it is preferable to suppress wrinkles that form on the flap 25 after capping by forming a notch 30 at the end of the flap 25 that does not reach the base of the flap 25.

[0043] Furthermore, even if the notch 30 is formed, the base of the flap 25 remains connected, so the repulsive force between the flap 25 and the projection 13 is easily transmitted evenly to the bridge 23, and does not hinder the simultaneous fracture of the bridge 23.

[0044] Furthermore, the notches 30 are formed in positions corresponding to each of the multiple bridges 23 in the state before opening. This prevents the flap 25 and the bridges 23 from interfering with each other during capping, thereby reducing the force required for capping. [Examples]

[0045] The following describes specific examples of how the present invention is implemented.

[0046] (Example 1) A stopper 1 equipped with a base portion 14 according to the embodiment was fabricated (Figure 2). In this case, the cap 20 was made using block polypropylene (MRF: 17, flexural modulus: 1240 MPa, product name: PM870V, manufactured by Sun Allomer Co., Ltd.), and the spout 10 was made using LDPE (MFR: 7, flexural modulus: 140, ESCR resistant grade, product name: M2170, manufactured by Asahi Kasei Corporation). In this case, when the stopper 1 was unopened, the distance D1 between the base portion 14a and the end of the tamper band 24 on the base portion 14a side was 1.0 mm, the distance D2 between the protrusion 14b and the flap 25 was 1.0 mm, the vertical distance a from the upper end of the protrusion 14b to the lower end of the tamper band 24 was 0 mm, and the horizontal distance b from the outer surface of the protrusion 14b to the inner surface of the tamper band 24 was +0.8 mm. The thickness of the flange portion 12 was 0.6 mm.

[0047] (Example 2) A stopper according to Example 2 was fabricated under the same conditions as in Example 1, except that D1 was set to 0.95 mm and a to -0.05 mm.

[0048] (Comparative Example 1) A stopper according to Comparative Example 1 was fabricated under the same conditions as in Example 1, except that D1 was set to 1.05 mm and a to +0.05 mm.

[0049] (Comparative Example 2) A stopper according to Comparative Example 1 was fabricated under the same conditions as in Example 1, except that b was set to +1.2 mm.

[0050] (Comparative Example 3) A stopper according to Comparative Example 2 was fabricated under the same conditions as in Example 1, except that the base portion 14 was not formed (Figure 5). At this time, the distance d' between the lower end of the tamper band and the flange portion was 1.0 mm.

[0051] The spouts according to Examples 1-2 and Comparative Examples 1-3 were transported on the packaging container manufacturing line, and it was confirmed whether the flange portion of another spout was caught in the gap between the spout and the cap.

[0052] The spouts according to Examples 1-2 and Comparative Examples 1-3 were welded to the container body 2, and it was confirmed whether or not the base paper was caught between the lower end of the cap and the spout during welding (more specifically, whether or not welding failure occurred due to the base paper being caught between the lower end of the cap and the spout). At this time, the thickness of the pack base paper constituting the container body was 0.45 mm.

[0053] Table 1 summarizes the results of the checks regarding the presence or absence of the base portion 14, the values ​​of D1, D2, d', a, and b, and whether or not the flange portion is pinched, and whether or not the base paper is pinched.

[0054] [Table 1]

[0055] In both Examples 1 and 2, a protrusion 14b was formed on the base portion 14, with a being 0 mm or less and b being between 0 mm and 1 mm. As a result, the shortest distance D3 between the tamper band 24 and the protrusion 14b was reduced, preventing the flange portion 12 of other caps or the base paper from getting caught between the lower end of the cap 20 and the spout 10, and also preventing the base paper from curling.

[0056] In Comparative Example 1, although a protrusion 14b was formed on the base portion 14, a was greater than 0 mm, causing the flange portion of another stopper to get caught between the lower end of the cap and the spout. However, no paper jamming (failure to weld) occurred in Comparative Example 1. This is thought to be because the protrusion 14b formed on the base portion 14 stopped the paper at the base portion 14, preventing it from penetrating further in (near the dispensing cylinder portion 11). When the paper is stopped at the base portion 14, the paper can return to its normal position when the paper is held down by the welding horn.

[0057] In Comparative Example 2, because b exceeded 1.0 mm, the flange portion of another stopper got caught between the lower end of the cap and the spout. On the other hand, the reason why the base paper did not get caught (failure to weld) is presumed to be because, as in Comparative Example 1, a protrusion 14b was provided on the base portion 14.

[0058] In Comparative Example 3, because the base portion 14b was not formed on the base portion 14, the flange portion of another stopper and the base paper became trapped (poor welding) between the lower end of the cap and the spout. [Industrial applicability]

[0059] The present invention can be used for a spout that is attached to the container body by welding or the like, and for a packaging container equipped with the same. [Explanation of Symbols]

[0060] 1: Mouthpiece 2: Container body 4a: Male screw 4b: Female thread 10: Spout 11: Pour cylinder part 12: Flange section 13:Protrusion 14: Base 14a: base 14b: Convex part 15: Barrier surface 20: Cap 21:Top section 22: Skirt section 23: Bridge 24: Tamper Band 25: Flap 29: Cut 30: Notch D1: Distance between the base and the base end of the tamper band. D2: Distance between the protrusion and the flap D3: Shortest distance between the convex part and the tamper band a: Vertical distance from the upper end of the protrusion to the lower end of the tamper band. b: Horizontal distance from the outer surface of the convex part to the inner surface of the tamper band

Claims

1. A spout comprising a spout and a cap attached to the spout, The aforementioned spout is A dispensing cylinder having a cylindrical shape, A base portion connected to one end of the dispensing cylinder portion, The base portion comprises a flange portion connected to the end opposite to the dispensing cylinder portion, The base portion has, in order from the flange portion side, a substantially cylindrical base and a protrusion provided on the base, On the outer circumferential surface of the dispensing cylinder portion, ring-shaped projections and male threads are formed in order from the base portion side, spaced apart from the base portion. The aforementioned cap is The top surface and, A skirt portion extending vertically from the edge of the top surface portion, with a female thread formed on its inner circumferential surface that engages with the male thread, A tamper band connected to the aforementioned skirt portion via multiple bridges, The tamper band comprises a flap formed on its inner surface at a predetermined distance from the end of the tamper band opposite to the skirt portion, which engages with the projection of the spout, The outer diameter of the base is larger than the inner diameter of the tamper band. When the cap is unopened, if D1 is the distance between the base and the end of the tamper band on the base side in the axial direction, and D2 is the distance between the protrusion and the flap, then the conditions D1 ≥ 0.5 mm and D2 ≥ 0.5 mm are satisfied. The vertical distance a from the upper end of the protrusion to the lower end of the tamper band is 0 mm or less. A stopper in which the horizontal distance b from the outer surface of the protrusion to the inner surface of the tamper band is 0 mm or more and 1.0 mm or less.

2. The spout according to claim 1, wherein the connection portion between the projection and the dispensing cylinder portion on the base portion side is provided with a reverse tapered barrier surface relative to the other end of the dispensing cylinder portion, and when opened, the end face of the flap and the barrier surface come into surface contact, thereby restricting the movement of the cap in the opening direction.

3. The spout according to claim 1, wherein D1 ≥ 1.0 mm and D2 ≥ 1.0 mm.

4. The spout according to claim 1, wherein in a cross-section including the central axis of the dispensing cylinder, the angle that the barrier surface makes with respect to the central axis of the dispensing cylinder is in the range of 40° to 50°.

5. The plurality of bridges are formed to protrude inward from the cap, straddling the skirt portion and the tamper band. The skirt portion and the tamper band are separated by a cut that does not penetrate the bridge. The flap is provided around the entire circumference of the inner surface of the tamper band. The spout according to claim 1, wherein, in the state before opening, notches are formed at the ends of the flap at positions corresponding to the plurality of bridges.

6. The stopper according to claim 1, wherein the material of the cap is a block copolymer of polypropylene.

7. The container body and A packaging container having a spout according to any one of claims 1 to 6, which is attached to the container body.

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