Cap and container

Abstract

To close a plug without breaking a bridge for a visual recognition at a manufacturing process by a cap and a container according to the invention.SOLUTION: A cap 1 according to the invention comprises a cap body 2 fitted to a container mouth part and rotating and a band 3 provided at a lower side Z2 of the cap body 2 in a vertical direction Z, the band 3 comprises a first connection part 38 connecting with the cap body 2, a locking claw part allowing a rotation of a plug closing side R2, abutting onto a locking projection part and restricting the rotation of a plug opening side R1, a first band 32 arranged along a rotational direction R and a second band 33 provided at the plug closing side R2 than the first band 32 and a first bridge 34 for coupling the first band 32 and the second band 33, the second band 33 comprises a projection part 50 projecting toward the cap body 2 and the first bridge 34 breaks when the locking claw part abuts onto the locking projection part of the container mouth part and the rotation is restricted.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a cap and a container.

Background Art

[0002] Conventionally, as beverage containers for water, tea, soft drinks, etc., openable containers such as bottle containers like PET bottles and paper pack containers with spouts have been widely used. Caps having a function for preventing unauthorized opening due to mischief or the like are attached to the mouth parts of those beverage containers. Many caps are composed of a cap body having an internal thread that screws onto the external thread of the mouth part, and an anti-unauthorized-opening band (tamper evidence band, hereinafter referred to as a TE band) having an annular breakable bridge at the lower part of the peripheral wall of the cap body.

[0003] For example, as shown in Patent Document 1, there is known a cap provided with a TE band in which the band is divided into two, and by breaking the bridge provided between the bands, it is possible to visually confirm that the cap has been opened. Also, as shown in Patent Document 2, there is known a cap provided with a TE band in which the band is divided into four and the visibility is further improved by increasing the number of bridges.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the case of a cap having a TE band as described in Patent Document 1, there was a risk that the bridge provided in between would break when the cap was rotated to the closed side (capping operation) in order to first attach the cap to the container during the manufacturing process.

[0006] In particular, caps having TE bands, such as those shown in Patent Document 2, have multiple bridges, resulting in even shorter lengths for each individual band. For example, as shown in Figure 14(a), one of the short bands 33A of the cap 1A, as shown in Patent Document 2, is connected to the cap body 2A by a connecting part 39A. When the cap 1A rotates during the capping process, the end 33Ap of the short band 33A on the opposite side of the cap body 2A and the connecting part 39A vibrates vertically in the opening and closing direction. As a result, as shown in Figure 14(b), the bridge 34A, which connected the bands, deforms due to the vertical force applied to it. Therefore, as shown in Figure 14(c), there was a risk that the bridge 34A would break during the manufacturing stage before the consumer could grasp the cap body 2A and remove it from the container.

[0007] This invention was made in consideration of these circumstances, and aims to provide a cap and container that can be sealed without breaking the visual bridge during the manufacturing process. [Means for solving the problem]

[0008] To solve the above problems, this invention proposes the following means. A cap according to a first aspect of the present invention is a cap to be attached to a container opening having a locking projection, comprising: a cap body that screws onto the container opening and rotates in the rotational direction; and a band provided on the lower side of the cap body in an up-down direction perpendicular to the rotational direction, wherein the band has a first connecting portion that connects the cap body and the band; a locking claw portion that allows rotation in the closing direction in the rotational direction and contacts the locking projection to restrict rotation in the opening direction opposite to the closing direction; a first band and a second band provided on the closing side of the first band arranged along the rotational direction; and a first bridge connecting the first band and the second band, wherein the second band has a projection that protrudes upward toward the cap body in the up-down direction, and the first bridge breaks when the locking claw portion contacts the locking projection and rotation toward the opening direction is restricted.

[0009] According to a second aspect of the present invention, the cap according to the first aspect has a width of the protrusion in the rotational direction that is shorter than half the length of the two bands.

[0010] According to a third aspect of the present invention, in the cap according to the first or second aspect, the width of the protrusion in the vertical direction is greater than half the height of the gap formed between the cap body and the band.

[0011] According to a fourth aspect of the present invention, in a cap according to any one of the first to third aspects, the length of the second band in the rotational direction is shorter than the length of the first band, and the cap is provided with a second connecting portion that connects the cap body and the second band.

[0012] According to a fifth aspect of the present invention, a cap according to any one of the first to fourth aspects comprises two or more of the bands.

[0013] According to the sixth aspect of the present invention, for the cap according to any one of the first to fifth aspects, the band further has an intermediate band between the first band and the first bridge, the vertical width of which is wider than the width of the first bridge and narrower than the width of the first band, and the first connecting portion is provided above the intermediate band.

[0014] The container according to the seventh aspect of the present invention includes a cap according to any one of the first to sixth aspects, and has the container mouth portion on the upper side.

Advantages of the Invention

[0015] According to the cap and the container of the present invention, it is possible to perform the closing operation without breaking the bridge for visual recognition in the manufacturing process.

Brief Description of the Drawings

[0016] [Figure 1] It is a perspective view schematically showing a cap according to an embodiment of the present invention. [Figure 2] It is a side view schematically showing the cap of FIG. 1. [Figure 3] It is a view showing the state of the cap of FIG. 1 as seen from the upper side in the vertical direction. [Figure 4] It is a cross-sectional view showing the band and the container mouth portion of the cap of FIG. 1 before the cap is opened. [Figure 5] It is a cross-sectional view schematically showing the cap of FIG. 1 along the I-I cross-section of FIG. 1. [Figure 6] It is a perspective view schematically showing the band of the cap of FIG. 1. [Figure 7] It is a side view schematically showing the band of the cap of FIG. 1. [Figure 8] It is a view showing the state of the band of the cap of FIG. 1 as seen from the lower side in the vertical direction. [Figure 9] It is a view showing the state of the band of the cap of FIG. 1 as seen from the upper side in the vertical direction. [Figure 10] It is a perspective view schematically showing the bent portion of the band of the cap of FIG. 1. [Figure 11] FIG. 1 is a diagram schematically showing a state of the arrangement of the first connecting portion, the first engaging portion, and the second engaging portion of the band and the arrangement of the locking projection of the container opening portion when the cap of FIG. 1 is not opened, as viewed from below. [Figure 12] FIG. 4 is a diagram schematically showing a state where the first engaging portion of the band of the cap of FIG. 1 is locked to the locking projection of the container opening portion and the arrangement of the second engaging portion at that time, as viewed from below. [Figure 13] (a) is a diagram for explaining a state where the second band of the cap of FIG. 1 vibrates in the vertical direction. (b) is a diagram for explaining a state where the second band of the cap of FIG. 1 vibrates in the vertical direction and moves upward. (c) is a diagram for explaining a state after the second band of the cap of FIG. 1 vibrates in the vertical direction. [Figure 14] (a) is a diagram for explaining a state where the band of a conventional cap vibrates in the vertical direction. (b) is a diagram for explaining a state where the band of a conventional cap vibrates in the vertical direction and moves upward. (c) is a diagram for explaining a state after the band of a conventional cap vibrates in the vertical direction.

BEST MODE FOR CARRYING OUT THE INVENTION

[0017] (One Embodiment) One embodiment of the present invention will be described with reference to FIGS. 1 to 13. Also, in the embodiments and modifications described below, the same reference numerals are given to corresponding configurations, and the description of overlapping parts may be omitted. Further, in the following description, expressions indicating relative or absolute arrangements such as "parallel", "orthogonal", "center", "coaxial", etc. not only strictly represent such arrangements, but also represent states where they are relatively displaced with tolerances and angles or distances that can obtain the same function.

[0018] Figure 1 is a schematic perspective view of a cap 1 according to one embodiment of the present invention. Figure 2 is a schematic side view of the cap 1 of Figure 1. Figure 3 is a view of the cap 1 of Figure 1 from the upper side Z1 in the vertical direction Z. Figure 4 is a view of the band 3 and the container opening 110 of the cap 1 of Figure 1 when it is unopened. Figure 5 is a schematic cross-sectional view of the cap 1 of Figure 1 along cross section II of Figure 1.

[0019] [Cap 1] In the following description of cap 1, the direction in which the central axis O1 of cap 1 extends is defined as the vertical direction Z, with the upper side being defined as upper Z1 and the lower side as lower Z2. The radial direction perpendicular to the central axis O1 of cap 1 is defined as the radial direction P, with the direction facing the central axis O1 being defined as inner P1 and the direction opposite to the central axis O1 being defined as outer P2. Furthermore, the direction centered on the central axis O1 of cap 1 is defined as the opening / closing direction (rotation direction) R, with right rotation being defined as the opening side R1 and left rotation as the closing side R2, as shown in Figure 1. However, this is merely a definition of the vertical direction Z and the opening / closing direction R for the sake of explanation and does not limit the installation position when cap 1 of the present invention is actually installed. Also, the radial direction P does not have to be perpendicular to the central axis O1 of cap 1. Also, the opening side R1 and closing side R2 of the opening / closing direction R may have opposite right and left rotations.

[0020] As shown in Figures 1 to 5, the cap 1 is attached to the container opening 110 of the container 100 and rotates in the opening / closing direction R relative to the container opening 110 to open and close the container 100. Here, the direction of rotation of the cap 1 coincides with the opening / closing direction R. For example, the material used for the cap 1 is polypropylene (PP) resin, high-density polyethylene (HDPE) resin, etc. The cap 1 comprises a cap body 2 and a band 3.

[0021] [Container 100] As shown in Figure 4, container 100 contains liquids, powders, etc. The contents contained in container 100 are poured out from the opening 110a of a hollow cylindrical container mouth 110 welded to the upper part Z1 of container 100. Container 100 is made of a synthetic resin such as polyethylene terephthalate (PET).

[0022] The container opening 110 may be, for example, the mouth of a bottle, or it may be a cylindrical dispensing device called a spout that is welded to a bag-shaped container. The container opening 110 has a male threaded portion 120 and a locking projection 130 on its outer surface 111 provided on the outside P2.

[0023] The male threaded portion 120 is provided on the outer surface 111 of the container opening portion 110 and is screwed into the female threaded portion 24 of the cap body 2, which will be described later.

[0024] The locking projection 130 is a projection located below the male screw portion 120 on Z2. As shown in Figure 4, the locking projection 130 protrudes outward P2 in the radial direction P and has a locking surface 130a at its tip. The locking projection 130 also has a locking open side surface 130c (see Figure 11) on the open side R1 and a locking closed side surface 130b (see Figure 11) on the closed side R2. The locking open side surface 130b is a surface that extends outward P2 in the radial direction P. The locking closed side surface 130c is a surface that extends along the outward P2 in the radial direction P and is inclined toward the open side R1. The four locking projections 130 are evenly arranged in the opening and closing direction R of the container opening 110. The locking projection 130 controls the rotation of the cap 1 in the opening and closing direction R by bringing the first engaging portion 321 and the second engaging portion 331, which will be described later, into contact with the locking open side surface 130c and the locking closed side surface 130b.

[0025] [Cap body 2] As shown in Figures 1 to 5, the cap body 2 covers the container opening 110 of the container 100 from the upper side Z1 in the vertical direction Z. The cap body 2 comprises a top wall portion 21 and a peripheral wall portion 22.

[0026] The top wall portion 21 is roughly disc-shaped and is provided on the upper side Z1 of the cap body 2. The top wall portion 21 covers the opening 110a of the container mouth portion 110 from the upper side Z1. The top wall portion 21 is provided with an inner ring 212 on the lower surface 21b of the top wall portion 21 which is located on the lower side Z2.

[0027] As shown in Figures 4 and 5, the inner ring 212 is located inside the peripheral wall portion 22, which will be described later, at a distance P1. The inner ring 212 is substantially hollow and cylindrical, extending downwards Z2 from the top wall portion 21. The length of the inner ring 212 in the vertical direction Z is shorter than that of the peripheral wall portion 22. When the cap 1 is attached to the container opening portion 110 from the upper side Z1, the inner ring 212 slides and contacts the inner surface 112 of the inner surface P1 of the container opening portion 110. With this configuration, the contents of the container 100 are contained without leaking to the outside of the container 100.

[0028] As shown in Figures 1 to 3, the peripheral wall portion 22 is formed in a substantially hollow cylindrical shape centered on the central axis O1 of the cap 1. The peripheral wall portion 22 extends downward Z2 from the edge 21f of the top wall portion 21. The peripheral wall portion 22 is formed in a tapered shape that opens radially outward P2 from the edge 21f of the top wall portion 21 downward Z2. The peripheral wall portion 22 has a protruding portion 23 on its outer peripheral surface 221 located on the outer side P2 of the peripheral wall portion 22. In addition, the peripheral wall portion 22 has a female thread portion 24 on its inner peripheral surface located on the inner side P1 of the peripheral wall portion 22.

[0029] As shown in Figures 1 to 3, the protruding portion 23 is a finger-grip portion that extends in a substantially convex shape outward in the radial direction P2 from the central axis O1 of the cap 1. Each protruding portion 23 is formed in a straight line from the upper side Z1 to the lower side Z2 of the peripheral wall portion 22. Multiple protruding portions 23 are arranged at predetermined intervals along the opening and closing direction R of the peripheral wall portion 22. The amount of projection of each protruding portion 23 outward in the radial direction P2 does not have to be the same.

[0030] For example, in this embodiment, as shown in Figures 1 to 3, among the multiple protrusions 23, the protrusion 23 with the largest overhang is designated as the first protrusion 23a. The first protrusions 23a are evenly distributed on all four sides of the peripheral wall 22 along the opening and closing direction R. Next, among the multiple protrusions 23, the protrusions 23 with a medium overhang (smaller than the large overhang) are designated as the second protrusions 23b. Two second protrusions 23b are evenly distributed between each first protrusion 23a. Furthermore, among the multiple protrusions 23, the protrusions 23 with a small overhang (smaller than the medium overhang) are designated as the third protrusions 23c. One third protrusion 23c is evenly distributed between each first protrusion 23a. Therefore, when a consumer (not shown) grasps the peripheral wall 22 of the cap body 2 and opens and closes the cap 1 in the opening and closing direction R, their fingertips will not slip. Note that the overhang of each protrusion 23 is not particularly limited and may all be the same.

[0031] As shown in Figures 4 and 5, the female thread portion 24 is provided on the inner side P1 of the peripheral wall portion 22. When the cap 1 is opened and closed in the opening / closing direction R, the female thread portion 24 engages with the male thread portion 120 provided on the container opening portion 110. With this configuration, the cap 1 is attached to the container 100 when rotated to the closing side R2 in the opening / closing direction R, and removed from the container 100 when rotated to the opening side R1 in the opening / closing direction R.

[0032] [Band 3] Figure 6 is a schematic perspective view showing the band 3 of the cap 1 in Figure 1. Figure 7 is a schematic side view showing the band 3 of the cap 1 in Figure 1. Figure 8 shows the band 3 of the cap 1 in Figure 1 viewed from the lower side Z2 in the vertical direction Z. Figure 9 shows the band 3 of the cap 1 in Figure 1 viewed from the upper side Z1 in the vertical direction Z. Figure 10 is a schematic perspective view showing the bent portion 60 of the band 3 of the cap 1 in Figure 1. As shown in Figures 1 or 6 to 10, band 3 is substantially annular and is provided on the lower side Z2 of the cap body 2. In the vertical direction Z, band 3 is provided with a gap S1 between it and the cap body 2 at approximately equal intervals, as shown in Figure 5. In this embodiment, the width of the gap S1 in the vertical direction Z is set to approximately 0.5 mm. Band 3 is used in a tamper-evidence type cap where the act of rotating to the open side R1 can be visually identified. Band 3 comprises two band bodies (bands) 30, as shown in Figure 6. The width of the gap S1 is not particularly limited, but it is desirable to set it to 0.2 mm or more in order to facilitate the manufacture of the cap 1.

[0033] Here, the axis passing through the central axis O1, perpendicular to the central axis O1, and passing through the center of the band 3 is defined as the first axis O2. As shown in Figure 6, the band 3 is formed in a substantially annular shape by connecting two band bodies 30 along the opening and closing direction R with a second bridge 35, which will be described later, with respect to the first axis O2. In this embodiment, the band 3 has two band bodies 30, but is not particularly limited. The band 3 may have only one band body 30, or it may have two or more. In the following description, one of the two band bodies 30 will be described. The other band body 30 will be described as having substantially the same configuration and will not be described. The band body (band) 30 includes a band side wall portion 31, a slit portion 37, a first connecting portion 38, and a second connecting portion 39.

[0034] As shown in Figures 6 to 10, the band sidewall portion 31 is the sidewall of the band body 30 and extends in the vertical direction Z. The band sidewall portion 31 is formed in a semicircular shape radially P from the central axis O1. The radius of the band sidewall portion 31 in the radial direction P is approximately the same as the radius of the cap body 2. As shown in Figure 6, the band sidewall portion 31 has a first band (long band) 32, a second band (short band) 33, a first bridge 34, a second bridge 35, and an intermediate band 36.

[0035] [First Band (Long Band) 32] The first band 32 is part of the band side wall 31 and is formed in a substantially plate shape, with a radial width P shorter than the vertical width Z and the opening / closing width R. The first band 32 is slightly curved as a whole, forming an arc along the opening / closing direction R on the central axis O1. The first band 32 comprises a first flange 40a and a first engaging portion (locking claw portion) 321.

[0036] As shown in Figure 6, the first flange 40a is provided at the upper end 32a of the upper side Z1 of the first band 32. The first flange 40a protrudes and extends inward in the radial direction P1 from the upper end 32a. The width of the first flange 40a in the radial direction P is formed to be approximately the same throughout all parts of the first flange 40a.

[0037] As shown in Figure 8, the first engaging portion (locking claw portion) 321 extends along the inner surface 32c of the first band 32 on the inner side P1 of the first band 32. The base end 321p of the first engaging portion 321 is connected to the inner surface 32c of the first band. The tip 321q of the first engaging portion 321 faces the opening side R1 in the opening / closing direction R. The upper end 321a of the first engaging portion 321 is connected to the first flange 40a, as shown in Figure 10. The first engaging portion 321 is elastically deformable and flexible enough to overcome the locking projection 130 of the container opening 110. Here, as shown in Figure 8, there are two first engaging portions 321 on the inner surface 32c of the first band. This is so that if the first engaging portion 321 located closer to the locking projection 130 fails to lock, the other first engaging portion 321 can lock onto the locking projection 130 to ensure the first bridge 34, which will be described later, is broken.

[0038] During the manufacturing process, when the cap 1 is rotated to the closed side R2 to initially attach the cap 1 to the container 100 (capping operation), the first engaging portion 321 contacts and locks against the locking open side 130c of the locking projection 130. However, since the locking open side 130c is inclined toward the open side R1, the first engaging portion 321 allows rotation toward the closed side R2 and moves smoothly over the locking projection 130. At this time, the first engaging portion 321 undergoes slight elastic deformation to overcome the locking projection 130. The first engaging portion 321 generates a restoring force that attempts to return to its original shape and acts on the locking projection 130. The locking projection 130 biases the band 3 outward P2 as a reaction force to the restoring force that has been applied. While the restoring force of the first engaging portion 321 is being generated, the band 3 expands outward P2 and is subjected to a tensile force along the opening and closing direction R.

[0039] The first engaging portion 321 contacts and locks against the locking closed side surface 130b of the locking projection 130 when the cap 1 is rotated by the consumer to the open side R1 (hereinafter referred to as the opening operation). When the cap 1 is further rotated to the closed side R2 while the first engaging portion 321 is locked to the locking projection 130, the first engaging portion 321 elastically deforms and overcomes the locking projection 130. At this time, the first engaging portion 321 elastically deforms more than during the capping operation and overcomes the locking projection 130. The restoring force of the first engaging portion 321 is greater than during the capping operation, so the tensile force applied to the band 3 along the opening and closing direction R is also greater. After overcoming the locking projection 130, the first engaging portion 321 returns to its original shape.

[0040] With the above configuration, the first engaging portion 321 can allow rotation of the closing side R2 during capping operations in the opening / closing direction R, and restrict rotation of the opening side R1 during opening operations.

[0041] [Second Band (Short Band) 33] The second band 33 is part of the band side wall 31 and, like the first band 32, is formed in a substantially plate shape with a radial width P shorter than the vertical width Z and the width R in the opening / closing direction. The second band 33 is slightly curved as a whole, forming an arc along the opening / closing direction R on the central axis O1. The width of the second band 33 in the opening / closing direction R is shorter than the width of the first band 32. The second band 33 is also provided on the closed side R2 than the first band 32. The second band 33 comprises a second flange 40b, a second engaging portion (locking claw portion) 331, and a protrusion 50.

[0042] As shown in Figure 6, the second flange 40b is provided on the upper end 33a of the upper Z1 of the second band 33. The second flange 40b protrudes and extends inward in the radial direction P1. The radial width P of the second flange 40b is approximately the same as that of the first flange 40a.

[0043] As shown in Figure 8, the second engaging portion (locking claw portion) 331 extends along the inner surface 33c of the second band 33 on the inner side P1 of the second band 33. The base end 331p of the second engaging portion 331 is connected to the inner surface 33c of the second band. The tip 331q of the second engaging portion 331 faces the opening side R1 in the opening / closing direction R. The upper end (not shown) of the first engaging portion 331 is connected to the second flange 40b. The second engaging portion 331, like the first engaging portion 321, has enough flexibility to elastically deform and overcome the locking projection 130 of the container opening 110. Furthermore, as shown in Figure 8, there are two second engaging portions 331 on the inner surface 33c of the second band. This is so that if the second engaging portion 331 located closer to the locking projection 130 fails to engage, the other second engaging portion 331 can engage with the locking projection 130 to ensure that the second bridge 35, which will be described later, is reliably broken.

[0044] The second engaging portion 331 is positioned close to the locking projection 130 in an unengaged state when the first engaging portion 321 of the first band 32 is engaged with the locking projection 130. For example, as shown in Figure 12, the second engaging portion 331 is shifted by a displacement amount A from the locking projection 130 when it is unengaged.

[0045] During the capping operation, the second engaging portion 331 contacts and locks against the locking open side 130c of the locking projection 130. However, since the locking open side 130c is inclined toward the opening side R1, the second engaging portion 331 allows rotation toward the closing side R2 and moves smoothly over the locking projection 130. At this time, the second engaging portion 331 undergoes slight elastic deformation to overcome the locking projection 130. The second engaging portion 331 generates a restoring force that attempts to return to its original shape and acts on the locking projection 130. The locking projection 130 biases the band 3 outward P2 as a reaction force to the restoring force that has been applied. While the restoring force of the second engaging portion 331 is being generated, the band 3 expands in diameter toward the outside P2 and is subjected to a tensile force along the opening / closing direction R.

[0046] During the opening operation, the second engaging portion 331 contacts and locks against the locking closing side surface 130b of the locking projection 130. When the cap 1 is further rotated toward the closing side R2 while the second engaging portion 331 is locked to the locking projection 130, the second engaging portion 331 elastically deforms and overcomes the locking projection 130. At this time, the second engaging portion 331 elastically deforms more than during the capping operation to overcome the locking projection 130. The restoring force of the second engaging portion 331 is greater than during the capping operation, so the tensile force along the opening and closing direction R applied to the band 3 is also greater. After overcoming the locking projection 130, the second engaging portion 331 returns to its original shape.

[0047] With the above configuration, the second engaging portion 331 can allow rotation of the closing side R2 during capping operations in the opening / closing direction R, and restrict rotation of the opening side R1 during opening operations.

[0048] The projection 50 is provided on the upper side Z1 of the second band 33 in the vertical direction Z. The projection 50 is also provided at the end of the closing side R2 of the second band 33. The projection 50 protrudes toward the cap body 2 located on the upper side Z1 in the vertical direction Z. The projection 50 is formed in a rectangular shape when viewed from the upper side Z1, and the width of the projection 50 in the radial direction P is approximately the same as the width of the second flange 40b provided on the upper side Z1 of the second band 33. Note that the projection 50 does not have to be formed in a rectangular shape when viewed from the upper side Z1; it may be formed in a circular or triangular shape. Also, the projection 50 may be formed so that its tip becomes narrower toward the upper side Z1 than toward the lower side Z2. This configuration can reduce the amount of material such as resin used. Furthermore, the width of the projection 50 in the opening and closing direction R is shorter than the width of the second band 33. More specifically, it is preferable that the width of the projection 50 in the opening and closing direction R is formed to be even shorter than half the length of the width of the second band 33. This configuration reduces the amount of material used, such as resin, and prevents the cap from interfering with other components of the cap, which could prevent the cap from opening and closing properly.

[0049] The height H1 of the protrusion 50 in the vertical Z direction is formed to be smaller than the gap S1 provided between the cap body 2 and the band 3. More specifically, the height H1 of the protrusion 50 is set to be about 0.2 mm. In this embodiment, the material of the protrusion 50 is high-density polyethylene (HDPE) resin, but it may also be polypropylene (PP) resin, low-density polyethylene (LDPE, LLDPE), etc. The height H1 of the protrusion 50 is not particularly limited, and in order to reduce the amount of resin used, it may be set to be lower than 0.2 mm or higher. For example, the height H1 of the protrusion 50 may be set to be higher than half the height of the gap S1 provided between the cap body 2 and the band 3 in the vertical Z direction. By setting the height H1 of the protrusion 50 to be higher than half the height of the gap S1, the vibration of the second band 33 in the vertical Z direction, which will be described later, can be further suppressed.

[0050] Here, the first flange 40a of the first band 32 and the second flange 40b of the second band 33, as shown in Figure 5, form a single, substantially hollow, disc-shaped flange 40 when the two band bodies 30 are connected and the band 3 is formed.

[0051] [First Bridge 34] As shown in Figures 6 and 7, the first bridge 34 is part of the band side wall 31 and is located on the open side R1 of the second band 33. The first bridge 34 connects the first band 32 and the second band 33 via an intermediate band 36, which will be described later. The width H2 of the first bridge 34 in the vertical direction Z is narrower than that of the first band 32, the second band 33, and the intermediate band 36. In addition, the first bridge 34 is set to be higher than the conventional height. Specifically, the width H2 of the first bridge 34 is set to about 0.39 mm compared to about 0.33 mm in the conventional case. However, the width H2 of the first bridge 34 is not particularly limited.

[0052] During the capping process, the first bridge 34 undergoes elastic deformation of the first engaging portion 321, generating a restoring force. When a tensile force is applied to the band 3, the first bridge 34, which is narrower in the vertical direction Z, experiences a force. However, since the first engaging portion 321 can smoothly move over the locking projection 130, the first bridge 34 does not break.

[0053] During the opening process, the first bridge 34's first engaging portion 321 comes into contact with the locking projection 130, restricting the rotation of the cap 1 toward the opening side R1. When this causes elastic deformation, a tensile force is applied to the band 3. As described above, a tensile force is then applied to the first bridge 34. The first bridge 34 breaks due to the tensile force generated in the opening / closing direction R when the first engaging portion 321 overcomes the locking projection 130.

[0054] [Second Bridge 35] The second bridge 35 is part of the band sidewall 31 and is provided on the closed side R2 of the second band 33. The width H3 of the second bridge 35 in the vertical direction Z is narrower than the first band 32, the second band 33 and the intermediate band 36, and is also narrower than the width H2 of the first bridge 34. Specifically, the width H3 of the second bridge 35 is set to approximately 0.33 mm, as in conventional designs. However, the width H3 of the second bridge 35 is not particularly limited.

[0055] During the capping process, the second bridge 35 generates a restoring force when the second engaging portion 331 elastically deforms and a tensile force is applied to the band 3. In the vertical direction Z, the second bridge 35, which is narrower in width, is subjected to this force. However, since the second engaging portion 331 can smoothly move over the locking projection 130, the second bridge 35 does not break.

[0056] During the opening process, the first engaging portion 321 of the second bridge 34 first comes into contact with the locking projection 130, applying a tensile force to the first bridge 34, causing it to break. After this, the second engaging portion 331 comes into contact with the locking projection 130. This restricts the rotation of the cap 1 toward the opening side R1, causing elastic deformation and applying a tensile force to the band 3. Subsequently, a tensile force is applied to the second bridge 35. The second bridge 35 breaks due to the tensile force generated in the opening / closing direction R when the second engaging portion 331 overcomes the locking projection 130.

[0057] [Intermediate band 36] The intermediate band 36 is part of the band side wall 31 and is provided between the first band 32 and the first bridge 34. The width of the intermediate band 36 in the vertical direction Z is wider than the width H2 of the first bridge 34 and the width H3 of the second bridge 35, but narrower than the width of the first band 32. Therefore, during the opening operation, the tensile force is applied more to the first bridge 34 and the second bridge 35, so the intermediate band 36 does not break, while the first bridge 34 and the second bridge 35 break.

[0058] [Slit section 37] The slit portion 37 is a slit formed from the upper side Z1 to the lower side Z2 of the band side wall portion 31. The width of the slit portion 37 in the opening and closing direction R is formed to be such that the first connecting portion 38, which will be described later, fits into the slit portion 37, and furthermore, there is a gap on both sides of the first connecting portion 38 in the opening and closing direction R.

[0059] [First connection section 38] The first connecting portion 38 connects the cap body 2 and the band 3. The first connecting portion 38 is located on the upper Z1 of the intermediate band 36 and fits into the slit portion 37. As shown in Figure 10, the first connecting portion 38 comprises a connecting portion 381 and a bent portion 60.

[0060] The connecting portion 381 is located on the upper side Z1 of the first connecting portion 38, and its upper end is connected to the cap body 2. The lower end of the connecting portion 381 is connected to the bent portion 60.

[0061] [Bent section 60] The bent portion 60 is provided at the lower end of the connecting portion 381 and is connected to the upper end of the intermediate band 38. As shown in Figure 10, the bent portion 60 branches off from the lower end of the connecting portion 381 and includes a receiving plate portion 61 and a support column portion 62.

[0062] The receiving plate portion 61 is formed such that, in the vertical direction Z, the upper end of the upper side Z1 is connected to the connecting portion 381, and the lower end of the lower side Z2 faces downward Z2. The receiving plate portion 61 has an inner surface 61a and an outer surface 61b on the inner side P1 and outer side P2 in the radial direction P, and is formed in a substantially plate shape. In the state before capping, as shown in Figure 10, the lower end and upper end of the receiving plate portion 61 are arranged substantially on the same straight line in the vertical direction Z. Furthermore, in the closed state of the cap 1 after capping (hereinafter referred to as the unopened state), as shown in Figure 4, the inner surface 61a of the receiving plate portion 61 abuts against the locking surface 130a of the locking projection 130 of the container opening portion 110 in the radial direction P. At this time, the locking projection 130 pushes the lower end of the receiving plate portion 61 outward P2. Therefore, the lower end of the receiving plate portion 61 is positioned outward P2 than the upper end. In this state, the central axis O3 of the first connecting portion 38 along the opening / closing direction R becomes parallel to the opening / closing direction R.

[0063] As shown in Figure 9, the receiving plate portion 61 has rounded edges on both sides in the opening / closing direction R, giving it a surface shape with a circular arc cross-section. Therefore, the receiving plate portion 61 does not engage with the locking projection portion 130 during the opening and closing operation of the cap 1. This configuration allows the receiving plate portion 61 to move over the locking projection portion 130 or to be properly positioned on the locking surface 130a on the outside P2 of the locking projection portion 130. Note that the receiving plate portion 61 is not limited to the shape described above, as long as it does not engage with the locking projection portion 130 during the capping operation.

[0064] The support column 62 is a support column that can bend and deform toward the outside P2 of the band 3. The upper end of the support column 62 is connected to the upper Z1 of the outer surface 61b of the receiving plate 61. The lower end of the lower Z2 of the support column 62 is connected to the upper Z1 of the intermediate band 36. In the radial direction P, the upper end of the upper Z1 of the support column 62 is located inward P1 from the lower end, and it is formed inclined toward the central axis O1. The width of the support column 62 in the opening and closing direction R is smaller than the width of the receiving plate 61.

[0065] In this embodiment, as shown in Figure 11, when the cap body 2 is in an angular position that properly closes the container opening 110, including the unopened state, the locking projection 130 and the bent portion 60 are set to be arranged radially P in the positional relationship in the opening / closing direction R. The support column 62 is bent in the unopened state, and the restoring force that tries to return this bend to its original state biases the intermediate band 36 connected to the bent portion 60 outward P2.

[0066] [Second connection section 39] As shown in Figures 6 and 7, the second connecting portion 39 connects the cap body 2 and the second band 33. The upper end of the upper Z1 of the second connecting portion 39 is connected to a part of the cap body 2. The lower end of the lower Z2 of the second connecting portion 39 is connected to the upper end of the second band 33, which is the closed side R2 in the opening / closing direction R.

[0067] [Operation and function of Cap 1] (effect 1) Here, the operation and function of the cap 1 will be explained with reference to Figures 11 and 12. First, in this embodiment, the function of breaking the first bridge 34 and the second bridge 35 of the band 3 will be explained. Figure 11 is a schematic diagram showing the arrangement of the first connecting portion 38, the first engaging portion 321 and the second engaging portion 331 of the band 3 and the arrangement of the locking projection 130 of the container opening portion 110, as viewed from below Z2, when the cap 1 in Figure 1 is unopened. Figure 12 is a schematic diagram showing the state in which the first engaging portion 321 of the band 3 of the cap 1 in Figure 1 is locked to the locking projection 130 of the container opening portion 110, and the arrangement of the second engaging portion 331 at that time, as viewed from below Z2. The arrangement of the first engaging portion 321 and the second engaging portion 331 in the opening and closing direction R is due to the movement of the cap body 2 rotating toward the opening side R1 when the cap is opened. Specifically, when the first engaging portion 321 of the first band 32 engages with the locking projection 130, the second engaging portion 331 is in a position close to the locking projection 130 in an unengaged state. As shown in Figure 12, the second engaging portion 331 is in an unengaged state when the first engaging portion 321 engages with the locking projection 130, and is shifted by a displacement amount A from the locking projection 130.

[0068] First, during the manufacturing process, the cap 1 is initially attached to the container 100 (capping operation). The cap 1 is attached to the container 100 by rotating it toward the closing side R2. At this time, the first engaging portion 321 of the first band 32 and the second engaging portion 331 of the second band 33 engage with the locking projection 130 of the container opening 110, but they are flexible enough to elastically deform and overcome the locking projection 130 of the container opening 110. The first engaging portion 321 and the second engaging portion 331 abut and engage with the locking open side 130c of the locking projection 130. However, since the locking open side 130c is inclined toward the opening side R1, the first engaging portion 321 and the second engaging portion 331 allow the band 3 to rotate toward the closing side R2 and move smoothly over the locking projection 130. When the first engaging portion 321 and the second engaging portion 331 elastically deform and generate a restoring force, and a tensile force is applied to the band 3, a force is applied in the vertical direction Z by the first bridge 34 and the second bridge 35. However, since the first engaging portion 321 and the second engaging portion 331 can move smoothly over the locking projection 130, the first bridge 34 and the second bridge 35 do not break.

[0069] In the closed state of cap 1 after the capping process (hereinafter referred to as the unopened state), as shown in Figure 11, the locking surface 130a of the locking projection 130 of the container opening 110 abuts against the locking projection 130 in the radial direction P, and the locking projection 130 pushes the lower end of the receiving plate 61 outward P2.

[0070] Next, the consumer rotates the cap 1 from its unopened state to the open side R1 (opening operation). When the cap body 2 is rotated to the open side R1, the first band 32 and the second band 33 are subjected to a rotational force toward the open side R1 in accordance with the movement of the cap body 2 connected to the first connection part 38 and the second connection part 39. As shown in Figure 12, the first engaging part 321 and the locking projection 130 first engage, and this engagement restricts and stops the rotation of the first band 32 toward the open side R1. At this time, the second engaging part 331 is not engaged with the locking projection 130. With the first engaging part 321 engaged with the locking projection 130, if the cap 1 is further rotated toward the closed side R2, the first engaging part 321 elastically deforms and overcomes the locking projection 130. At this time, the first engaging portion 321 undergoes greater elastic deformation than during the capping operation and overcomes the locking projection 130. Furthermore, the first engaging portion 321 biases the band 3 outward P2. A tensile force is applied to the band 3 in the opening / closing direction R, causing the first bridge 34 to break.

[0071] When the first bridge 34 breaks, the band 3 splits into two. Due to the action of the bent portion 60 described later, the intermediate band 36 protrudes outwards P2 of the band 3. This makes it easier for the first engaging portion 321 of the first band 32, which is positioned on the opening side R1 of the intermediate band 36, to disengage from the locking projection 130. Even after the first bridge 34 breaks first, when the cap body 2 is rotated toward the opening side R1, the second band 33 rotates toward the opening side R1 because it is connected to the cap body 2 by the second connecting portion 39. Subsequently, the second engaging portion 331 and the locking projection 130 lock into place. The second engaging portion 331 elastically deforms and overcomes the locking projection 130. At this time, the second engaging portion 331 elastically deforms more than during the capping process and overcomes the locking projection 130. This applies a tensile force to the second bridge 35, causing the second bridge 35 to break. The breakage of the second bridge 35 also causes the second engaging portion 331 to disengage from the locking projection 130. As a result, the consumer can remove the cap 1 from the container 100.

[0072] In this way, the first bridge 34 breaks before the second bridge 35, and the second bridge 35 breaks after the first bridge 34 has broken, thus staggering the timing of the breaks. The time difference between when the first bridge 34 breaks and when the second bridge 35 breaks is set to be short, so as not to impair the smooth opening operation.

[0073] (effect 2) Next, the function of the bent portion 60 of the first connecting portion 38 will be explained. In this embodiment, the first bridge 34 and the second bridge 35 are broken when the unopened cap 1 is rotated in the opening / closing direction R. After that, the cap body 2, which has been removed from the container opening 110, is reattached to the container opening 110 and rotated to the closing side R2. When the cap body 2 is in the angle position that properly closes the container opening 110, the locking projection 130 and the bent portion 60 are arranged radially P in the positional relationship in the opening / closing direction R.

[0074] The receiving plate portion 61 of the bent portion 60 abuts against the locking surface 130a of the locking projection portion 130. Since the first bridge 34 and the second bridge 35 have already broken, the support portion 62 of the receiving plate portion 61 remains inclined without bending. As a result, the intermediate band 36 on the lower Z2 of the first connecting portion 38 protrudes outward P2 of the band 3. Furthermore, the first band 32 connected to the intermediate band 36 also protrudes outward P2 of the band 3. Therefore, even if the cap 1 is attached to the container 100 after it has been opened, the first band 32 protrudes outward P2, making it easy to visually confirm that the cap 1 has been opened from the container 100.

[0075] Furthermore, even if the protruding first band 32 is pushed inward into P1, the bent portion 60 of the first connecting portion 38, which overlaps with the locking projection 130 in the opening / closing direction R, pushes out the first band 32 due to the action of a restoring force, making it impossible to restore the band 3 to its original state before opening. In addition, the central axis O3 of the first connecting portion 38 was parallel to the opening / closing direction R in the unopened state, but after the opening operation, the rupture of the bridge causes the central axis O3 to shift relative to the opening / closing direction R, resulting in a non-parallel state.

[0076] (effect 3) Next, with reference to Figure 13, the operation and function of the band during the capping process in manufacturing will be explained. Figure 13(a) illustrates the state in which the second band 33 of cap 1 in Figure 1 vibrates in the vertical direction Z. Figure 13(b) illustrates the state in which the second band 33 of cap 1 in Figure 1 vibrates in the vertical direction Z and moves to the upper side Z1. Figure 13(c) illustrates the state after the second band 33 of cap 1 in Figure 1 has vibrated in the vertical direction Z.

[0077] In the manufacturing process, once the container 100 is filled with liquid by the filling machine, the cap 1 is rotated to the closed side R2 by a high-speed capping machine (capping operation). In this embodiment, the rotation speed of the cap 1 during the capping operation by the high-speed capping machine is set to approximately 500 rpm.

[0078] As shown in Figure 13(a), the band 3 vibrates as the cap 1 rotates during the capping process. The cap 1 has a gap S1 between the cap body 2 and the band 3. Consequently, the band 3 also vibrates in the vertical direction Z. In particular, the second band 33 is formed with a shorter width in the opening / closing direction R than the first band 32. Therefore, the vertical movement Z due to vibration is more intense in the second band 33 than in the first band 32.

[0079] In Figure 13(b), the second band 33 vibrates in the vertical direction Z, starting from the second connecting portion 39 that connects to the cap body 2 on the open side R1. However, a protrusion 50 is provided on the upper side Z1 of the second band 33 on the open side R1. The protrusion 50 has height in the vertical direction Z, and displaces the gap between the second band 33 and the cap body 2 by making the gap width smaller than the gap S1. As a result, the vibration in the vertical direction Z is suppressed.

[0080] Therefore, in Figure 13(c), even after the capping operation by the high-speed capping machine is completed, the first bridge 34 of band 3 does not break and connects the second band 33 and the intermediate band 36. In other words, the protrusion 50 that displaces the width of the gap in the vertical direction Z between the second band 33 and the cap body 2 has a greater influence on the first bridge 34. As a result, the cap 1 of this embodiment can prevent the first bridge 34 from breaking during the capping operation.

[0081] In this embodiment, the band 3 of the cap 1 is equipped with a first engaging portion 321 and a second engaging portion 331. Therefore, the first engaging portion 321 and the second engaging portion 331 can allow the band 3 to rotate on the closing side R2 and restrict the rotation on the opening side R1 in the opening and closing direction R.

[0082] Furthermore, in this embodiment, the first bridge 34 and the second bridge 35 are arranged so that there is a difference in their breaking timing. Therefore, the rotational force required to rotate the cap body 2 to the opening side R1 is not large. As a result, consumers can easily open the cap 1 from the container 100.

[0083] Furthermore, in this embodiment, a first connecting portion 38 is formed in the slit portion 37. Therefore, when a consumer opens the cap 1 from the container and then closes it again, the first connecting portion 38 shifts outward P2 from the slit portion 37, making it easy to visually confirm that it has been opened and closed once.

[0084] Furthermore, in this embodiment, the central axis O3 of the receiving plate portion 61 was parallel to the opening / closing direction R when the cap was not opened. However, after the opening operation, the rupture of the bridge causes the central axis O3 to shift relative to the opening / closing direction R, and it becomes no longer parallel. Therefore, consumers can visually confirm the shift in the central axis O3 of the receiving plate portion 61 to determine that the cap 1 has been opened from the container 100.

[0085] Furthermore, in this embodiment, a protrusion 50 is formed on the upper side Z1 of the second band 33. Therefore, even if the second band 33 vibrates in the vertical direction Z during the capping process in manufacturing, vibration is suppressed. As a result, it is possible to prevent the first bridge 34 from breaking during the capping process.

[0086] Furthermore, in this embodiment, the first bridge 34 is set to be higher than in the conventional configuration. Therefore, even if vibrations are applied to the band 3 in the vertical Z direction during capping by a high-speed capping machine, the first bridge 34 is less likely to deform than in the conventional configuration. As a result, the first bridge 34 can connect the second band 33 and the intermediate band 36 without breaking.

[0087] In any of the above embodiments, the cap and container according to the present invention allow for the sealing process to be performed without breaking the visual bridge during the manufacturing process. [Examples]

[0088] The cap 1 of the present invention will be further described with reference to Tables 1 and 2, using examples. However, the technical scope of the present invention is not limited in any way by the content of the examples.

[0089] (experiment) To confirm the effect of the protrusion 50 provided on the second band 33, an experiment was conducted to check for fracture of the first bridge 34 during the capping process in the manufacturing process.

[0090] Band 3 was tested using Comparative Example 1, Comparative Example 2, and Example 1. In the experiment, the cap body 2 of the cap 1 used in Comparative Example 1, Comparative Example 2, and Example 1 were all identical. Furthermore, the materials, etc., of the cap 1 used in Comparative Example 1, Comparative Example 2, and Example 1 were also all identical. Note that the bridge height in Tables 1 and 2 refers to the width H2 of the first bridge and the width H3 of the second bridge in one embodiment. Also, the height H1 of the protrusion 50 was set to 0.2 mm, as in one embodiment.

[0091] [Table 1]

[0092] Comparative Example 1, as shown in Table 1, is a conventional band 3, in which the protrusion 50 is not formed on the upper side Z1 of the second band. In this case, the bridge height of the first bridge of band 3 in Comparative Example 1 is set to 0.36 mm, and the bridge height of the second bridge is set to 0.30 mm. Comparative Example 2 is a band 3 without the protrusion 50. In Comparative Example 2, the bridge height of the first bridge of band 3 is increased from 0.30 mm to 0.41 mm. In Comparative Example 2, the bridge height of the second bridge of band 3 is increased from 0.30 mm to 0.35 mm. The cross-sectional area of ​​the first and second bridges in Comparative Example 2 has increased by 15% compared to before the change. Furthermore, Example 1 is a band 3 that forms the protrusion 50. In Example 1, the bridge height of the first bridge of band 3 is increased from 0.33 mm to 0.39 mm. In Example 1, the bridge height of the second bridge of band 3 is not changed from 0.33 mm. Therefore, the second bridge of band 3 in Example 1 is thinner than the first bridge. In Example 1, the cross-sectional area of ​​both the first and second bridges is increased by 9% compared to the original design.

[0093] Experiments were conducted on Comparative Example 1, Comparative Example 2, and Example 1 by performing the capping process during manufacturing. In this experiment, 10,850 units of Comparative Example 1, 9,780 units of Comparative Example 2, and 9,810 units of Example 1 were inspected and tested. The results of the experiment are shown in Table 2.

[0094] [Table 2]

[0095] Table 2 shows that in Comparative Example 1, a conventional product, 19 out of 10,850 units inspected experienced first bridge fracture after capping. The bridge fracture rate (number of fractured bridges ÷ number of units inspected × 100%) was 0.18%. In Comparative Example 2, 30 out of 9,780 units inspected experienced first bridge fracture after capping. The bridge fracture rate was 0.31%. In Example 1, 0 out of 9,810 units inspected experienced first bridge fracture after capping. The bridge fracture rate was 0%.

[0096] From the results of Comparative Example 1 and Comparative Example 2, it was found that when the protrusion 50 is not formed and the cross-sectional area of ​​the first and second bridges is increased as in Comparative Example 2, the incidence of bridge fracture increases compared to the conventional Comparative Example 1. Therefore, it is considered that simply increasing the cross-sectional area of ​​the first and second bridges does not prevent the fracture of the first bridge after the capping process, and may even increase the fracture of the first bridge.

[0097] Next, from the results of Comparative Example 1, Comparative Example 2, and Example 1, it was found that when a protrusion 50 is formed on the upper Z1 of the second band 33 as in Example 1, and the bridge height is increased relative to the first bridge only, thereby increasing the cross-sectional area, the number of occurrences becomes zero. Therefore, it was confirmed that the protrusion 50 can suppress vibration of the second band during the capping process and prevent fracture of the first bridge. In addition, it is considered that increasing the bridge height relative to the first bridge only makes the first bridge less likely to deform when the second band vibrates, thereby reducing fracture of the first bridge.

[0098] (modified version) The cap of the present invention is not particularly limited and can be applied to caps other than those having a TE band.

[0099] Furthermore, the container opening to which the cap of the present invention is attached may be, for example, the mouth of a bottle, or a cylindrical dispensing device called a spout that is welded to a bag-shaped container.

[0100] Furthermore, although the band in the above-described embodiment comprises two band bodies, it is not particularly limited and may comprise only one band body or two or more. [Industrial applicability]

[0101] The cap and container according to the present invention can be closed during the manufacturing process without breaking the visible bridge, making them industrially applicable. [Explanation of symbols]

[0102] 1. 1A Cap 100 containers 110 Container opening 130 Locking protrusion 2. 2A Cap Body 21 Top wall section 22 Peripheral wall section 23 Projection part 3, 3A band 30 Band body (band) 31 Band side wall 32. First Band (Long Band) 321 First engaging portion (locking claw portion) 33, 33A Second Band (Short Band) 331 Second engaging portion (locking claw portion) 34 First Bridge 35 Second Bridge 36 Intermediate bands 37 Slit section 38 First connection section 39 Second connection section 40 flange 50 Protrusion 60 Bent section 61 Receiving plate section 62 Pillar section S1 Gap H1 (Height of the protruding part) H2 (width of the first bridge) H3 (width of the second bridge) O1 center axis O2 1st axis O3 (Central axis of the first connection) P radial direction Z vertical direction R Opening / closing direction (rotation direction)

Claims

1. A cap that is attached to the opening of a container equipped with a locking projection, A cap body that screws onto the opening of the container and rotates in the rotational direction, A band provided on the lower side of the cap body in the vertical direction perpendicular to the rotational direction, Equipped with, The E band is A first connecting part that connects the cap body and the band, A locking claw portion that allows rotation on the closing side in the aforementioned rotational direction and contacts the locking projection portion to restrict rotation on the opening side in the opposite direction to the closing side, A first band arranged along the rotational direction and a second band provided on the closing side of the first band, A first bridge connecting the first band and the second band, A slit portion is formed between the first band and the second band and has a width that accommodates the first connecting portion and the first bridge in the rotational direction, It has, The second band has a projection that protrudes upward toward the cap body in the vertical direction, The protrusion is provided on the upper side of the second band in the vertical direction and at the end of the second band adjacent to the slit portion on the closing side. The first bridge breaks when the locking claw comes into contact with the locking projection, thereby restricting rotation toward the open side. cap.

2. The width of the protrusion in the rotational direction is shorter than half the length of the width of the second band. The cap according to claim 1.

3. The height of the protrusion in the vertical direction is greater than half the height of the gap formed between the cap body and the band. The cap according to claim 1 or claim 2.

4. The length of the second band in the aforementioned rotational direction is shorter than the length of the first band. The aforementioned cap is It includes a second connecting part that connects the cap body and the second band. The cap according to any one of claims 1 to 3.

5. The aforementioned cap comprises two or more of the aforementioned bands. The cap according to any one of claims 1 to 4.

6. The E band is Furthermore, between the first band and the first bridge, there is an intermediate band whose vertical width is wider than the width of the first bridge and narrower than the width of the first band. The first connecting portion is provided on the upper side of the intermediate band. The cap according to any one of claims 1 to 5.

7. A cap comprising the cap described in any one of claims 1 to 6, A container having the container opening on its upper side.

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