JP3381203B2 - Synthetic resin container lid with tamper-evident hem - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin container lid applied to the mouth and neck of a container for storing beverages, and more specifically, tamper evidence (when tampering is applied, traces thereof remain. The present invention relates to a synthetic resin container lid having characteristics.

[0002]

As is well known, a synthetic resin container lid having a tapper-evidence characteristic is widely applied to the mouth and neck of a glass or synthetic resin container for soft drinks and the like. As a prior art document disclosing a typical example of such a container lid ,
Japanese Patent Publication 62-18421 and JP Laid 4-3114
No. 61 publication can be cited.

The container lid disclosed in the above-mentioned prior document includes a top surface wall and a cylindrical skirt wall depending from the top surface wall. A circumferential breaking means is formed on the skirt wall, and the skirt wall is divided into a main portion above the circumferential breaking means and a tamper-evidence skirt below the circumferential breaking means. A female thread is formed on the inner peripheral surface of the main portion of the skirt wall, and a locking means is formed on the inner peripheral surface of the tamper-evident skirt. The locking means is composed of, for example, a plurality of flap pieces protruding inward in the radial direction at intervals in the circumferential direction. The circumferential breaking means is composed of a plurality of circumferentially spaced slits extending in the circumferential direction and a plurality of bridging portions located between the slits. At least one (usually one) of the plurality of bridging portions is a non-breaking bridging portion having higher strength than the other bridging portions. Axial breaking means are formed on the tamper evidence skirt.

A typical example of the axial breaking means formed in the tamper-evidence skirt is an upper slit extending downward from the upper end connected to or close to the circumferential breaking means and an upper slit close to the lower end of the upper slit. The rupture line includes a lower slit extending downward to the lower end of the skirt wall or its vicinity.

The above-mentioned synthetic resin container lid is applied to a container in which a male screw thread and a locking jaw portion located therebelow are formed on the outer peripheral surface of the mouth and neck portion. By fitting the container lid on the mouth and neck of the container and screwing the female thread formed on the main part of the skirt wall onto the male thread on the mouth and neck, the container lid is attached to the mouth and neck of the container. It is fitted and the mouth and neck is sealed. The locking means formed on the skirt of the tamper evidence is locked on the locking jaw of the mouth and neck. When the container lid is detached from the mouth and neck of the container to open the mouth and neck, the container lid is rotated in the opening direction, that is, in the direction in which the screw engagement between the female screw and the male screw is released. As a result, the female thread formed on the main portion of the skirt wall is moved along the male thread of the mouth and neck portion, so that the main portion of the skirt wall is moved upward with rotation in the opening direction. However, the tamper-evidence skirt is prevented from moving upward because its locking means is locked to the locking jaw of the mouth and neck. Thus, considerable stress is generated in the circumferential breaking means, and the bridging portion of the circumferential breaking means is broken, leaving the non-breaking bridging portion. Further, the breaking line forming the axial breaking means formed on the tamper-evidence skirt is ruptured, and the tamper-evident skirt is cut from the endless ring into an endless belt. After that, the skirt of the tamper-evidence can also be lifted freely, and the container lid as a whole is lifted with the rotation in the opening direction to be detached from the mouth / neck.

[0006]

The conventional synthetic resin container lid of the above-mentioned form has the following problems to be solved. That is, when the container lid is detached from the mouth and neck of the container to open the mouth and neck, the rupture means in the axial direction of the tamper evidence hem often remains without being cut. In this case, the non-breaking bridging part in the circumferential breaking means is broken, the tamper-evidence hem is completely separated from the main part of the skirt wall, and the tamper-evident hem is left in the mouth and neck of the container. The other parts of the container lid (main parts of the top wall and the skirt wall) are separated from the mouth and neck. Alternatively, the non-breaking bridging portion of the circumferential breaking means is also left without being broken, and the parts other than the tamper-evident hem of the container lid are separated from the mouth and neck, but are left in the mouth and neck. A state in which the main part of the skirt wall is connected to the skirt of the tamper evidence through the non-breaking bridging part (generally referred to as the hanging state of the container lid) occurs. However, if the tamper-evidence hem or with it any other part of the container lid connected to it via a non-breaking bridge is left without separation from the mouth and neck, the container will not be reused. At this time, it is necessary to perform a complicated process of cutting the tamper-evidence hem to remove the tamper-evidence hem from the mouth and neck or the other part of the container lid together with it. Further, even when the container is discarded without being reused, it is recently required to separately collect the container and the container lid made of different materials from the viewpoint of so-called environmental protection,
Therefore, it is necessary to perform a complicated process of cutting the tamper-evidence hem to remove the tamper-evidence hem from the mouth and neck or the other part of the container lid together with it.

In order to surely prevent the axial breaking means of the tamper evidence skirt from being left without being cut, for example, in the axial direction of the portion left between the upper slit and the lower slit, It is intended to reduce the breaking strength of the axial breaking means by significantly shortening the length. However, if such a solution is not adopted, according to the experience of the present inventors, when some impact is applied to the container lid during the processing of the container lid in the printing process, etc., the axial direction A separate problem arises in that the breaking means is easily broken.

The present invention has been made in view of the above facts, and its main technical problem is that the axial direction breaking means of the tamper evidence skirt is broken when the container lid is processed in a printing process or the like. Axial breaking means formed on the tamper-evidence skirt when opening the mouth and neck by removing the container lid from the mouth and neck of the container without causing a separate problem such as a tendency. It is an object of the present invention to provide an improved synthetic resin container lid in which the tamper-evidence skirt is sufficiently reliably cut as required to cut the tamper-evidence skirt from an endless ring to an endless belt.

[0009]

As a result of earnest research and experiments, the inventors of the present invention have made the above-mentioned technique by making the axial breaking means formed in the tamper evidence skirt into a unique shape different from the conventional one. I found that I could solve a specific problem.

That is, in the container lid made of synthetic resin improved according to the present invention, the axial breaking means formed on the tamper-evidence skirt has the main breaking line and the female part formed on the main portion of the skirt wall. When the screw is screwed onto the male screw formed on the outer peripheral surface of the mouth and neck of the container and the container lid is screwed onto the mouth and neck of the container, the main breakage is in the direction opposite to the rotation direction of closing the container lid. It is composed of a sub fracture line which is arranged at a slight interval in the circumferential direction from the line.

In one aspect of the present invention, the main breaking line is an upper main slit extending downward from an upper end connected to or close to a circumferential breaking means formed in a skirt wall, and the upper main slit. and a lower main slit extending from the upper end proximate the lower end to the lower end or its vicinity of the skirt wall below, sub fracture line upper main slit <br/> preparative lower end substantially the same height or above than Including a sub-slit extending from the upper end located at to the lower end of the skirt wall or its vicinity, and when the container lid is detached from the mouth and neck of the container, the fracture progresses downward from the upper main slit and the lower main slit. Due to or to the top
As the rupture progresses from the main slit in the direction opposite to the container lid closing rotation direction and reaches the sub-slit, the tamper-evident skirt is cut from the endless ring into an endless band. It is configured.

The upper end of the main break line is connected to or close to the slit located on the front side of the reinforced bridge portion adjacent to the reinforced bridge portion when viewed in the container lid closing direction, and the auxiliary break line is the reinforced bridge line. Conveniently, it is located below the tangle. The circumferential distance between the main break line and the sub break line is 0.5 to 1.5 mm, and the distance between the lower end of the upper main slit and the upper end of the lower main slit in the main break line is 0.4. It is preferably from 0.8 mm to 0.8 mm.

In another aspect of the present invention, the main breaking line is a main slit extending downward from an upper end connected to or adjacent to a circumferential breaking means formed on a skirt wall,
A main score extending downward from the lower end of the main slit to the lower end of the skirt wall or its vicinity, and the sub-break line is substantially equal to or higher than the lower end of the main slit from the upper end to the skirt. When the container lid is disengaged from the mouth and neck of the container, including a sub-slit extending from the lower end of the wall to the vicinity thereof, due to the progress of breakage from the main slit to the main score, or from the main slit. The tamper-evidence skirt is configured to be cut from an endless annular shape to an endless belt shape due to the rupture proceeding in the direction opposite to the container lid closing rotation direction and reaching the sub-slit. There is.

The residual thickness of the main score at the main break line is preferably gradually increased downward. The upper end of the main break line is connected to or close to the slit located adjacent to the front side of the reinforced bridging portion as viewed in the container lid closing direction, and the sub break line is the reinforced bridging portion. Conveniently it is located below. The circumferential distance between the main break line and the sub break line is 0.5.
It is preferable that it is from 1.5 mm to 1.5 mm.

[0015]

In the synthetic resin container lid improved in the above-mentioned one aspect of the present invention, due to the progress of fracture from the upper slit in the direction opposite to the container lid closing rotation direction to reach the sub slit, The axial breaking means is broken to cut the tamper-evidence skirt from an endless ring into an endless belt. Alternatively, when the rupture progresses downward from the upper slit to reach the lower slit, the axial rupturing means is ruptured and the tamper-evident skirt is cut from the endless annular shape to the endless belt shape. According to the experiments by the present inventors, the breaking of the axial breaking means by either of the above two modes is realized depending on the container lid opening / rotating mode of the consumer and the like, and thus the tamper evidence hem is endlessly and reliably. It is cut from a ring into an end strip.

Also in the synthetic resin container lid improved in the above-mentioned other aspect of the present invention, the fracture progresses from the main slit in the direction opposite to the container lid closing rotation direction to reach the sub slit. , The skirt of the tamper evidence is cut into an endless belt from an endless ring. Alternatively, the tamper-evidence skirt is cut from the endless annular shape to the endless belt shape because the rupture progresses downward from the upper slit and the main score is ruptured. According to the experiments by the present inventors, the breaking of the axial breaking means by either of the above two modes is realized depending on the container lid opening / rotating mode of the consumer and the like, and thus the tamper evidence hem is endlessly and reliably. It is cut from a ring into an end strip.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in more detail with reference to the accompanying drawings which show preferred embodiments of the synthetic resin container lid improved according to the present invention.

Referring to FIG. 1, a container lid, generally designated by reference numeral 2, which can be formed from a suitable synthetic resin such as polypropylene by compression molding or injection molding is a circular top wall 4 and this top wall 4. And a cylindrical skirt wall 6 that hangs from the peripheral edge of the. A circumferential breaking means 8 is formed on the skirt wall 6, and the skirt wall 6 has a main portion 10 above the circumferential breaking means 8 and a tamper-evidence hem portion 12 below the circumferential breaking means 8. It is partitioned. The circumferential breaking means 8 includes a plurality of slits 14 extending in the circumferential direction at intervals in the circumferential direction, and the slits 1.
It is composed of a plurality of bridging portions 16 located between the four. One of the plurality of bridge portions 16 is the other bridge portion 16
It is the non-breaking bridging portion 16A whose strength is increased by increasing the size in the circumferential direction as compared with the above. If desired, two or more non-breaking bridges can be formed. To further elaborate on the circumferential breaking means 8, in the illustrated embodiment, the lower inner diameter of the skirt wall 6 is made somewhat larger than the upper inner diameter to define an annular shoulder 18. Immediately below the shoulder portion 18, a plurality of ribs 22 extending in the axial direction are formed on the inner peripheral surface of the skirt wall 6 at intervals in the circumferential direction.
At the portion of the circumferential breaking means 8 (upper end portion of the rib 22), the skirt wall 6 is continuously cut in the circumferential direction, leaving a plurality of ribs 22. Such cutting is not performed over the entire circumferential direction, but is partially left in the circumferential direction without being cut. Therefore, the tamper-evidence skirt 12 below the circumferential breaking means 8 is above the circumferential breaking means 8 via the plurality of ribs 22 left uncut and the circumferential non-cutting portion. Is connected to the main part 10. The plurality of ribs 22 define the bridging portion 16, and the cutting line between the plurality of ribs 22 defines the slit 14. The circumferential non-cutting portion defines the non-breaking bridging portion 16A.

On the outer peripheral surface of the main portion 10 of the skirt wall 6, there is formed an uneven shape 24 for preventing slippage of a finger locked therein. A female thread 26 is formed on the inner peripheral surface of the main portion 10 of the skirt wall 6. Such female thread 2
A notch 28 extending in the axial direction is formed at 6. The notch 28 defines a so-called air passage when the mouth and neck of the container is opened. An annular protrusion 30 is formed at the upper end of the inner peripheral surface of the skirt wall 6, and the space defined by the annular protrusion 30 and the inner surface of the top wall 4 is made of an appropriate synthetic resin such as soft polyethylene. A sealing liner 32 formed by compression molding is provided. A plurality of locking means 34 are formed on the inner peripheral surface of the tamper-evident skirt 12 at intervals in the circumferential direction. Such locking means 3
Each of 4 inclines from the inner peripheral surface of the tamper-evidence skirt 12 toward the opposite direction to the container lid closing rotation direction when the container lid 2 is attached to the mouth and neck of the container, and radially inward. It is composed of a flap piece protruding toward one side.

The above-described construction of the illustrated container lid 2 does not constitute the novel features of the container lid improved according to the invention, but is already known, and is therefore described here above. Detailed description of the configuration is omitted.

Continuing the description with reference to FIG. 2 together with FIG. 1, the tamper-evidence skirt 12 is formed with axial breaking means 36. This axial breaking means 36
Is composed of a main break line 38 and a sub break line 40. The sub-rupture line 40 is formed by screwing the female thread 26 formed on the main portion 10 of the skirt wall 6 of the container lid 2 into a male thread formed on the mouth and neck of the container, which will be described later.
The main breaking line 38 in the direction opposite to the closing rotation direction of the container lid 2 (clockwise when viewed from above in FIGS. 1 and 2) when the screw is screwed onto the mouth and neck of the container (hence the opening rotation direction).
Are arranged at a slight interval D1 in the circumferential direction.
The circumferential distance D1 is preferably about 0.5 to 1.5 mm. The main break line 38 is the upper main slit 4
2 and the lower main slit 44. The upper main slit 42 includes the non-breaking bridging portion 16 when viewed in the closing rotation direction of the container lid 2 in the circumferential breaking line 8 described above.
From the upper end connected to the slit 14 located on the front side adjacent to A to the axially intermediate portion of the tamper-evident hem portion 12 substantially vertically (thus, substantially with respect to the central axis of the container lid 2). It is extended downwards (in parallel). If desired, instead of connecting the upper end of the upper main slit 42 to the slit 14, the upper main slit 42 may be spaced downward from the slit 14 by, for example, about 0.2 mm.
The lower main slit 44 extends substantially vertically downward from the upper end near the lower end of the upper main slit 42 to the lower end of the skirt wall 6. The distance D2 between the lower end of the upper main slit 42 and the upper end of the lower main slit 44 is preferably about 0.4 to 0.8 mm. Instead of extending the lower main slit 44 to the lower end of the skirt wall 6, the lower end of the lower main slit 44 may be positioned above the lower end of the skirt wall 6 by, for example, 0.2 to 0.5 mm. The sub break line 40 is composed of a sub slit 46. The sub slit 46 extends substantially vertically downward from the upper end, which is important to be located at the same height as or above the lower end of the upper main slit 42 in the main break line 38, to the lower end of the skirt wall 6. It is present. Instead of extending the sub slit 46 to the lower end of the skirt wall 6, the lower end of the sub slit 46 is, for example, 0.2 to 0.5 mm from the lower end of the skirt wall 6.
It can also be positioned slightly above. In the illustrated embodiment, the upper main slit 4 in the main break runner 38 is
2 and the lower main slit 44 and the sub slit 46 in the sub break line 40 extend substantially vertically, but if desired, for example, in a direction opposite to the closing rotation direction of the container lid 2 downward. Somewhat (5 against vertical
It can also be tilted. The upper main slit 42 and the lower main slit 44 in the main breaking run 38 and the sub slit 46 in the sub breaking line 40.
Is the slit 16 in the circumferential break line 8 described above.
It can be formed by cutting the tamper-evidence skirt 12 when forming.

FIG. 3 shows a state in which the container lid 2 is attached to the mouth / neck portion 48 of the container. The mouth-neck portion 48 of the container, which can be formed of glass or an appropriate synthetic resin such as polyethylene terephthalate, has a cylindrical shape as a whole, and has an external thread 50 and the external thread 5 on its outer peripheral surface.
An annular locking jaw portion 52 located below 0 is formed. After filling the container with an appropriate content part such as a soft drink containing carbon dioxide, the container lid 2 is attached to the mouth / neck part 48. At this time, the container lid 2 fitted in the mouth / neck portion 48 is rotated in the closing rotation direction, that is, in the clockwise direction when viewed from above in FIG. 3, and thus the main portion 10 of the skirt wall 6 in the container lid 2 is rotated. The formed female thread 26 is screwed onto the male thread 50 formed on the mouth-neck portion 48 of the container. The locking means 34 formed on the tamper-evidence skirt 12 of the container lid 2 is elastically deformed and elastically restored after passing through the locking jaws 52 of the mouth / neck 48 to lock. The lower surface of the jaw 52 is locked. The sealing liner 32 disposed on the inner surface of the top surface wall 4 of the container lid 2 is brought into close contact with the upper end surface of the mouth / neck portion 48,
This seals the mouth / neck portion 48.

In order to open the mouth / neck portion 48 of the container, the container lid 2 is rotated in the opening rotation direction, that is, in the counterclockwise direction when viewed from above in FIG. Thus, the female thread 26 formed on the main portion 10 of the skirt wall 6 of the container lid 2 is formed.
Is moved along the male screw thread 50 formed on the mouth / neck portion 48 of the container, so that the container lid 2 is raised with rotation. When the container lid 2 is slightly raised to separate the sealing liner 32 from the upper end surface of the mouth / neck portion 48, pressure in the container is passed from below the sealing liner 32 through the notch 28 formed in the female thread 26. Is escaped to the outside. The tamper-evidence skirt 12 of the container lid 2 does not move upward because the locking means 34 formed on the inner peripheral surface of the tamper-evident hem 12 is locked to the locking jaw 52 of the mouth / neck 48. Be blocked. Due to this, a considerable stress is generated in the bridging portions 16 in the circumferential breaking means 8 formed in the skirt wall 6, and all the bridging portions 16 except the non-breaking bridging portions 16A are broken. . Furthermore, tamper evidence hem 1
A considerable amount of stress is also generated in the axial breaking means 36 in 2, and the axial breaking means 36 is broken, so that the tamper-evidence skirt 12 is cut from the endless annular shape to the endless belt shape.
After that, the tamper-evidence skirt 12 is also raised freely, and thus the entire container lid 2 is separated from the mouth / neck portion 48, and the mouth / neck portion 48 is opened.

The rupture of the axial breaking means 36 at the tamper-evidence skirt 12 will be described in more detail. In the container lid 2 improved according to the present invention, as shown in FIG. Slit 4
In accordance with the rotation of the container lid 2 in the opening rotation direction, the breaking progresses in the opening rotation direction to reach the auxiliary slit 46 of the auxiliary breaking line 40, whereby the tamper-evidence hem 12 is formed into an end strip. Be disconnected. Alternatively, as shown in FIG. 5, the rupture progresses downward from the upper main slit 42 in the main rupture line 38 to the lower main slit 44 in the main rupture line 38, whereby the tamper-evidence skirt 12 has an end. It is cut into strips. According to experiments by the present inventors, which of the two breaking modes is realized mainly depends on the rotating mode of the container lid 2. For example, if the container lid 2 is continuously rotated in the opening rotation direction over a relatively large angle range without interruption, the breakage progresses from the upper main slit 42 in the main break line 38 in the opening rotation direction to cause a sub-breakage. Sub slit 46 of line 40
Has a large tendency to On the other hand, when the container lid 2 is rotated in the opening rotation direction over a relatively small angle range, the rotation is temporarily interrupted, and then the container lid 2 is rotated again, the main breaking line The rupture progresses downward from the upper main slit 42 of the main break line 38.
The tendency to reach the lower main slit 44 is large. Whichever of the above two modes is realized, in the container lid 2 improved according to the present invention, the axial breaking means 36 in the tamper-evidence skirt 12 is reliably broken, and the tamper-evident skirt 12 is endless. It is surely cut into an endless band without being maintained in an annular shape. Therefore, it is sufficiently prevented that the tamper-evidence hem portion 12 or the other portion of the tamper-evidence hem portion 12 or other portion thereof remains in the mouth / neck portion 48 without being detached.

6 and 7 illustrate another embodiment of a container lid modified according to the present invention. In this embodiment, a relatively thin inward curl 154 is formed at the lower end of the skirt wall 106. Such curls 154
Can be conveniently formed by subsequently heating and deforming a curl of a protrusion formed to extend downward substantially straight in compression molding or injection molding. As clearly shown in FIG. 7, the tamper-evidence skirt 112 is formed with an axial breaking means 136, and the axial breaking means 136 is composed of a main breaking line 138 and a sub breaking line 140. There is. The secondary break line 140 is defined by the skirt wall 106 of the container lid 102.
The container lid 102 when the female thread 126 formed on the main part 110 of the container is screwed into the male thread formed on the mouth and neck of the container to screw the container lid 102 onto the mouth and neck of the container. In the direction opposite to the closing rotation direction (clockwise when viewed from above in FIGS. 6 and 7) of the main breaking line 13 (hence the opening rotation direction).
It is arranged at a slight distance D1 from the circumference in the circumferential direction. The circumferential distance D1 is preferably about 0.5 to 1.5 mm. The main break line 138 includes a main slit 142 and a main score 144 extending downward from the lower end of the main slit 142 to the upper end of the curl 154. The main slit 142 is exactly the same as the upper slit 42 of the main break line 38 in the above-described embodiment, and the circumferential break line 10 formed in the skirt wall 106.
8, from the upper end connected to the slit 114 located on the front side of the container lid 102 adjacent to the non-breaking bridging portion 116A when viewed in the closing rotation direction, the axially intermediate portion of the tamper-evidence skirt 112. Up to substantially vertically (and thus substantially parallel to the central axis of the container lid 102). Main slit 1 if desired
Instead of connecting the upper end of 42 to the slit 114, it may be spaced downward from the slit 114 by, for example, about 0.2 mm. Tamper evidence hem 11
The main score 144, which is conveniently formed by partially notching 2 from its outer or inner surface, has its residual thickness gradually increased downward, as shown in FIG. Is preferred. Sub breaking line 1
40 is composed of a sub slit 146. This sub-slit 146 extends substantially vertically downward from the upper end, which is substantially at the same height as or above the lower end of the upper main slit 142 in the main break line 138, to the upper end of the curl 154. It has been confused. If desired, the curl 154 may also be slit or scored following the main score 144 at the main break line 138 and also following the minor slit 146 at the minor break line 140. However, when the curl 154 is formed by heating and deformation after compression molding or injection molding as described above, the curl 154 becomes relatively fragile due to such heating and deformation, so that no slit or score is particularly formed. However, the curl 154 can be easily broken when the container lid is detached from the mouth and neck of the container. The main slit 142 and the main score 144 of the main break run 138 and the sub slit 146 of the sub break line 140 extend substantially vertically, but if desired, for example, the closing rotation of the container lid 102 may be directed downward. It may be tilted in the opposite direction to the direction (5 to 10 degrees with respect to the vertical direction). Main slit 142 in main break run 138
The main score 144 and the sub slit 146 in the sub breaking line 140 also cut the tamper-evidence skirt 112 at a required portion (slit forming portion) and form a required portion (score) when forming the slit 114 in the circumferential breaking line 108. It can be formed by making a cut at the formation site).

The structure of the container lid 102 shown in FIGS. 6 to 8 is substantially the same as the container lid described with reference to FIGS. 1 to 5 except for the above-described structure. The container lid 102 shown in FIGS. 6 to 8 is also attached to the mouth and neck of the container in the same manner as the container lid 2 described above to seal the mouth and neck. When opening the mouth-neck portion of the container, all the bridging portions 116 other than the non-breaking bridging portion 116A in the circumferential breaking means 108 formed in the skirt wall 106 are broken and the tamper-evident hem is formed. The axial breaking means 136 of the portion 112 is broken to cut the tamper-evident skirt 112 from an endless ring to an endless belt, and the entire container lid 102 is detached from the mouth and neck.

Tamper evidence hem 1 of container lid 102
The breakage of the axial breaking means 136 at 12 will be described in more detail below with the improved container lid 102 in accordance with the present invention.
Also, as shown in FIG. 9, the main breaking line 138
In accordance with the rotation of the container lid 102 in the opening rotation direction, the breaking progresses in the opening rotation direction to reach the auxiliary slit 146 of the auxiliary breaking line 140, and the curl 154 breaks following the auxiliary slit 146. As a result, the tamper-evident skirt 112 is cut into an end strip. Alternatively, as shown in FIG. 10, the rupture progresses downward from the main slit 142 in the main rupture line 138 to the main score 144, the curl 154 is ruptured following the main score 144, and the tamper-evidence skirt 112 ends. It is cut into strips. According to an experiment conducted by the present inventors, which of the two breaking modes described above is realized is based on the above-described container lid 102.
As in the above case, it mainly depends on the manner of rotation of the container lid 102. For example, when the container lid 102 is continuously rotated in the opening rotation direction over a relatively large angle range without interruption, the main slit 14 in the main break line 138 is obtained.
The fracture progresses in the opening rotation direction from 2 and the secondary fracture line 140
There is a great tendency to reach the sub slit 146. On the other hand, when the container lid 2 is rotated in the opening rotation direction over a relatively small angle range, the rotation is temporarily interrupted, and then the container lid 2 is rotated again, the main breaking line The main score 1 downward from the main slit 142 at 138
There is a large tendency for the fracture to progress to 44. Whichever of the above two modes is realized, in the container lid 102 improved according to the present invention, the axial breaking means 136 in the tamper evidence hem 112 is surely broken, and the tamper evidence hem 112 is endless. It is surely cut into an endless band without being maintained in an annular shape. Therefore, the tamper-evidence hem 112 or the container tamper-evident hem 112 is attached to the container lid 10.
It is sufficiently avoided that the other parts of 2 are left in the mouth and neck without being removed.

Next, experimental examples and comparative experimental examples of the container lid improved according to the present invention will be described.

Experimental Example 1 A container lid having the form shown in FIGS. 1 and 2 was manufactured. The container lid body was made of polypropylene and the sealing liner was soft polyethylene. The dimensions of the main part of the manufactured container lid were as follows. Outer diameter of main part of skirt wall (upper half part) 29.8 mm Overall height of container lid ・ ・ ・ ・ ・ ・ 19.1 mm Wall thickness of tamper evidence hem・ ・ ・ 1.0 mm Cross-sectional area of rib (bridge part) ・ ・ ・ ・ ・ ・ 0.38 mm ² Circumferential length of non-breaking bridge part ・ ・ ・ ・ ・ ・ 1. 8 mm Circumferential distance D1 between main breaking line and sub breaking line in axial breaking means D1 ... 1.0 mm Distance D2 between lower end of upper main slit and upper end of lower main slit in main breaking line 6 mm

The container lid as described above has a nominal diameter of 28.
It was attached to the mouth and neck of a container, which is a glass bottle for storing 500 ml, having a mouth and neck of a shape as shown in FIG. When one housewife carried out the opening operation of the mouth and neck on the 10 containers, as shown in Table 1 below, in the opening operation of all the containers, the axial breaking means at the hem of the tamper evidence was broken and the tamper shrimp was broken. The dent hem was cut into an end strip, and the entire container lid was detached from the neck of the container.

Experimental Example 2 A container lid having the form shown in FIGS. 6 and 7 was manufactured. The container lid body was made of polypropylene and the sealing liner was soft polyethylene. The dimensions of the main part of the manufactured container lid were as follows. Outer diameter of main part of skirt wall (upper half) ・ ・ ・ 29.9mm Overall height of container lid ・ ・ ・ ・ ・ ・ ・ ・ 20.3mm Thickness of tamper evidence hem・ ・ ・ 1.1 mm Rib (bridge portion) cross-sectional area ・ ・ ・ ・ 0.34 mm ² Circumferential length of non-breaking bridge portion ・ ・ ・ ・ 1. 8mm curl total length (protruding length before curl molding) 3.0mm curl wall thickness ... 0.35mm Main break line and sub break line in axial breaking means Circumferential distance D1 ... 1.0 mm

When an unsealing experiment similar to that of Experimental Example 1 was carried out, as shown in Table 1 below, in the unsealing operation of all the containers, the axial rupture means in the tamper-evidence skirt was broken and the tamper-evident skirt was broken. It was cut into an end strip and the entire container lid was detached from the mouth and neck of the container.

[0033] consists axial breakage means only from the main breaking line in the Comparative Experiment tamper evident bottom portion, to produce the same container lid and Experimental Example 1 except for a point that does not include a secondary fracture line.
Then, when the same opening experiment as in Experimental Example 1 was performed,
As shown in Table 1 below, in the three containers, the axial rupture means in the tamper-evidence skirt is broken, the tamper-evident skirt is cut into an end strip, and the entire container lid is opened and closed. However, in the seven containers, the non-breaking bridging portion in the circumferential breaking means was broken without breaking the axial breaking means, and the endless annular tamper-evidence skirt was formed on the container mouth. It was left in the neck.

[0034]

[Table 1]

[0035]

In the container lid made of synthetic resin improved according to the present invention, when the mouth and neck of the container is opened, the axial breaking means formed in the tamper-evidence skirt is reliably broken. The endless annular shape is cut into an endless belt shape, and thus the entire container lid is sufficiently reliably separated from the mouth and neck.

[Brief description of drawings]

FIG. 1 is a side view, partially in section, of a preferred embodiment of a container lid improved in accordance with the present invention.

FIG. 2 is a partial view showing axial breaking means formed on a tamper-evidence skirt of the container lid shown in FIG.

FIG. 3 is a side view, partly in section, showing a state in which the container lid shown in FIGS. 1 and 2 is attached to the mouth and neck of the container.

FIG. 4 is a partial view showing a breaking mode of axial breaking means formed on a tamper-evidence skirt portion of the container lid shown in FIGS. 1 to 3;

5 is a partial view showing another breaking mode of the axial breaking means formed on the tamper-evident bottom of the container lid shown in FIGS. 1 to 3. FIG.

FIG. 6 is a side view, partially in section, of another preferred embodiment of a container lid improved in accordance with the present invention.

7 is a partial view showing axial breaking means formed on the tamper-evidence skirt of the container lid shown in FIG.

8 is a partial cross-sectional view showing the residual thickness of the main score at the main breaking line of the axial breaking means in the container lid shown in FIGS. 6 and 7. FIG.

FIG. 9 is a partial view showing a breaking mode of axial breaking means formed on a tamper-evidence skirt portion of the container lid shown in FIGS. 6 to 8;

FIG. 10 is a partial view showing another breaking mode of the axial breaking means formed at the tamper-evident hem of the container lid shown in FIGS. 6 to 8;

[Explanation of symbols]

2: Container lid 4: Top wall 6: Skirt wall 8: Circumferential breaking means 10: Main part of skirt wall 12: Tamper evidence hem 14: Slits in the circumferential breaking means 16: Bridge portion in the circumferential breaking means 10A: Non-breaking bridge portion 22: Rib 26: Female thread 32: Sealed liner 34: Locking means 36: Axial direction breaking means 38: Main break line 40: Secondary breaking line 42: Upper main slit in main break line 44: Lower main slit in main break line 46: Secondary slit in the secondary break line 48: Mouth and neck of container 50: Male thread 52: Locking jaw 102: container lid 106: Skirt wall 108: Circumferential break line 110: Main part of skirt wall 112: Tamper evidence hem 114: Slits in the circumferential breaking means 116: Slit in the circumferential breaking means 116A: Non-breaking bridge portion 126: Female thread 136: Axial breaking means 138: Main break line 140: Secondary break line 142: Main slit in main break line 144: Main score at main break line 146: Sub slit in the sub breaking line 154: Curl

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 62-251352 (JP, A) Actual development 61-91546 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B65D 41/34

Claims (8)

(57) [Claims] 1. A top surface wall and a cylindrical skirt wall depending from the top surface wall, wherein the skirt wall is formed with a circumferential breaking means, and the skirt wall is located above the circumferential breaking means. And a tamper-evidence skirt below the circumferential breaking means, and a female thread is formed on the inner peripheral surface of the main part, and the inner periphery of the tamper-evidence skirt is formed. A locking means is formed on the surface, and the circumferential breaking means is composed of a plurality of circumferentially spaced slits extending in the circumferential direction and a plurality of bridging portions located between the slits. , At least one of the plurality of bridging portions is a non-breaking bridging portion having a higher strength than other bridging portions, and an axial breaking means is formed in the tamper-evidence skirt portion. In the synthetic resin container lid, the axial breaking means is a main breaking line. When the female lid formed on the main portion of the skirt wall is screwed onto the male thread formed on the outer peripheral surface of the mouth and neck of the container to screw the container lid onto the mouth and neck of the container. In the direction opposite to the container lid closing rotation direction, and a sub-rupture line disposed at a slight interval in the circumferential direction from the main break line, the main break line being provided in the circumferential break means. The auxiliary breaking line includes an upper main slit extending downward from an upper end connected to or adjacent to the lower main slit, and a lower main slit extending downward from an upper end adjacent to a lower end of the upper main slit to a lower end of the skirt wall or its vicinity. When the container lid is disengaged from the mouth and neck of the container, including a sub-slit extending from the upper end located substantially at the same height as or above the lower end of the upper main slit to the lower end of the skirt wall or its vicinity, Down from the upper main slit Due to the rupture progressing toward the lower main slit, or from the upper main slit in a direction opposite to the container lid closing rotation direction and reaching the sub slit. Then, the tamper-evident skirt is configured to be cut from an endless ring into an endless belt shape, a synthetic resin container lid. 2. The upper end of the main breaking line is connected to or close to a slit located adjacent to the reinforced bridging portion and on the front side thereof when viewed in the container lid closing direction, and the sub breaking line is The synthetic resin container lid according to claim 1, which is located below the reinforced bridge portion. 3. The synthetic resin container lid according to claim 1, wherein a circumferential distance between the main break line and the sub break line is 0.5 to 1.5 mm. 4. The composition according to claim 1, wherein a distance between a lower end of the upper main slit and an upper end of the lower main slit in the main breaking line is 0.4 to 0.8 mm. Resin container lid. 5. A top surface wall and a cylindrical skirt wall depending from the top surface wall, wherein the skirt wall is formed with a circumferential breaking means, and the skirt wall is located above the circumferential breaking means. And a tamper-evidence skirt below the circumferential breaking means, and a female thread is formed on the inner peripheral surface of the main part, and the inner periphery of the tamper-evidence skirt is formed. A locking means is formed on the surface, and the circumferential breaking means is composed of a plurality of circumferentially spaced slits extending in the circumferential direction and a plurality of bridging portions located between the slits. , At least one of the plurality of bridging portions is a non-breaking bridging portion having a higher strength than other bridging portions, and an axial breaking means is formed in the tamper-evidence skirt portion. In the synthetic resin container lid, the axial breaking means is a main breaking line. When the female lid formed on the main portion of the skirt wall is screwed onto the male thread formed on the outer peripheral surface of the mouth and neck of the container to screw the container lid onto the mouth and neck of the container. In the direction opposite to the container lid closing rotation direction, and a sub-rupture line disposed at a slight interval in the circumferential direction from the main break line, the main break line being provided in the circumferential break means. A main slit extending downward from an upper end connected to or adjacent to the main slit, and a main score extending downward from a lower end of the main slit to a lower end of the skirt wall or its vicinity, and the auxiliary breaking line is substantially the lower end of the main slit. A sub-slit extending from an upper end located at the same height or higher to the lower end of the skirt wall or in the vicinity thereof,
When the container lid is disengaged from the mouth and neck of the container, the fracture progresses from the main slit to the main score, or fractures from the main slit in the opposite direction to the container lid closing rotation direction. The tamper-evidence skirt is configured to be cut from an endless annular shape into an endless belt shape due to the progress of the above to reach the sub slit. 6. The synthetic resin container lid according to claim 5, wherein the residual thickness of the main score at the main break line is gradually increased downward. 7. An upper end of the main break line is connected to or close to a slit located adjacent to the reinforced bridging portion and on the front side thereof when viewed in the container lid closing direction, and the sub break line is The synthetic resin container lid according to claim 5 or 6, which is located below the reinforced bridge portion. 8. The synthetic resin container lid according to claim 5, wherein a circumferential distance between the main break line and the sub break line is 0.5 to 1.5 mm.