JPH07329998A - Tamper-evident synthetic resin container-cap - Google Patents

Abstract

PURPOSE:To provide a container cap that makes it impossible to break the sealing of the neck of a container without breaking the circumferential break line of the cap. CONSTITUTION:A container cap 2 comprises a shell 4 and a liner member 6. The portion provided with threads 38 of the shell 4 has cuts 40. Two or more projections 54a are provided at the cuts 40, or the portion of the female threads 38 are provided with projections. The linear member 6 is not adhered or weakly adhered to the shell 4.

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 having a so-called tamper-evidence characteristic in which the trace of the mouth and neck of the container is left unclear once the container is opened, and more particularly to the mouth and neck of the container. The present invention relates to a synthetic resin container lid having tamper-evidence characteristics, which is conveniently used when a negative pressure is generated in the container in a state in which the mouth and neck are sealed by wearing.

[0002]

2. Description of the Related Art As a container lid having a tamper-evint characteristic for a container such as a beverage, for example, Japanese Patent Laid-Open No. 60-1484.
No. 63 or Japanese Patent Application Laid-Open No. 61-104959 proposes a synthetic resin container lid, which has been widely put into practical use. Such a synthetic resin container lid comprises a synthetic resin shell and a synthetic resin liner member. The shell has a circular top surface wall and a cylindrical skirt wall that hangs from the peripheral edge of the top surface wall, and a rupture line extending in the circumferential direction is formed on the skirt wall. It is divided into an upper main part and a tamper-evidence skirt below the circumferential break line. 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 liner member is disposed on the inner surface of the top wall of the shell.

The container lid as described above is applied to a container in which a male thread and an annular locking jaw located below the male thread are formed on the outer peripheral surface of a cylindrical mouth-neck part. When attaching the container lid to the mouth and neck of the container to seal the mouth and neck, fit the container lid onto the mouth and neck and rotate it in the closing rotation direction. Screw the male thread of. By the engagement of the female thread and the male thread, the container lid is moved downward with the rotation in the closing rotation direction, and the locking means formed on the inner peripheral surface of the tamper-evidence skirt of the container lid is It is elastically deformed or displaced to get over the annular locking jaw of the mouth and neck, and then elastically restored and locked to the lower surface of the annular locking jaw. The liner member disposed on the inner surface of the top wall is brought into close contact with the upper end of the mouth / neck portion, thereby sealing the mouth / neck portion. To open the mouth and neck of the container, the container lid is rotated in the opening rotation direction. As a result, the female thread of the container lid is moved along the male thread of the mouth-neck portion, and thus the container lid is moved upward with rotation in the opening rotation direction. However, since the locking means formed on the inner peripheral surface of the tamper-evidence skirt is locked to the annular locking jaw of the mouth and neck, the tamper-evident skirt is prevented from moving upward. Thus, the circumferential break line formed on the skirt wall is broken to separate the tamper-evident hem from the main portion of the skirt wall. Then, the tamper-evident hem is left in the mouth and neck, and the other part of the container lid is separated from the mouth and neck, and the mouth and neck is opened. If the axial rupture line is formed at the hem of the taper evidence, the circumferential rupture line is ruptured by leaving a part of the circumferential rupture line instead of the entire circumferential direction and rupturing the axial rupture line. The evidence skirt is developed from an endless annular shape to an endless belt shape so that the locking means is disengaged from the annular locking jaw of the mouth and neck, and the entire container lid is disengaged from the mouth and neck.

[0004]

Therefore, the conventional container lid having the above-mentioned form has the following problems to be solved. When the container lid is attached to the mouth and neck of the container as required and the mouth and neck is sealed, when the container lid is rotated about 100 to 150 degrees in the opening rotation direction, the container is placed on the inner surface of the top wall. The liner member is separated from the upper end of the mouth and neck, and thus the seal of the mouth and neck is broken, but the circumferential rupture line (and the axial rupture line) is not yet ruptured. , And therefore the mouth and neck seal is already broken,
Therefore, there is a possibility that the contents are deteriorated, but there may occur a situation in which no trace indicating that the contents themselves have occurred can be generated at all. In particular, if the content is a fruit juice beverage, the content is heat sterilized prior to sealing the mouth and neck,
Negative pressure is generated in the container when the contents are cooled to room temperature after fitting the container lid on the mouth and neck, but when the seal of the mouth and neck is destroyed as described above, the outside air is contained in the container. Enter the
Due to this, the contents may be corroded.

The present invention has been made in view of the above facts, and a technical problem to be solved by the invention is to improve a synthetic resin container lid so that the container lid has a local breaking line (and axial breaking line). It is virtually impossible to break the seal of the mouth and neck without causing a mechanical rupture.

[0006]

In order to solve the above technical problems, according to the present invention, a plurality of female threads formed in the inner peripheral surface of the main portion of the skirt wall are circumferentially spaced. Disposing the interrupted region at each part, and disposing a plurality of flexible projecting pieces arranged at intervals in the circumferential direction and positioned in the interrupted region of the female thread. Each of the strips extends radially inward beyond the radially inner edge of the female thread. Alternatively, a flexible projecting piece that extends radially inward from the female thread itself formed on the inner peripheral surface of the main portion of the skirt wall is provided. Further, the shell and the liner member are made to be in a non-adhesive or weakly adhered state, the liner member is configured to be separated from the inner surface of the top wall of the shell with a relatively small force, and the outer diameter of the liner member is set to a protruding piece Larger than the inner diameter of.

That is, according to one aspect of the present invention, it has a top wall and a cylindrical skirt wall hanging down from a peripheral edge of the top wall,
A rupture line extending in the circumferential direction is formed on the skirt wall, and the skirt wall has a main portion above the circumferential rupture line and a tamper evidence skirt below the circumferential rupture line. And a synthetic resin shell in which a female thread is formed on the inner peripheral surface of the main portion, and locking means is formed on the inner peripheral surface of the tamper-evident hem portion, A synthetic resin container lid having tamper-evidence characteristics, comprising a synthetic resin liner member disposed on an inner surface of the top wall of the shell, wherein a plurality of female threads are circumferentially spaced from each other. A discontinuity region is disposed in the region of the inner peripheral surface of the main portion of the skirt wall, and the discontinuity region is disposed in the discontinuity region of the female thread. A plurality of flexible protruding pieces are provided, and each of the protruding pieces is Extend radially inward beyond the radially inner edge of the female thread, the shell and the liner member are in a non-bonded or weakly bonded state, and the liner member has a relatively small force. Is provided so as to be separated from the inner surface of the top wall of the shell, and the outer diameter of the liner member is larger than the inner diameter of the projecting piece.

According to another aspect of the present invention, there is provided a top wall and a cylindrical skirt wall hanging from a peripheral edge of the top wall, and the skirt wall is formed with a break line extending in a circumferential direction. The skirt wall is divided into a main part above the circumferential break line and a tamper-evidence skirt below the circumferential break line, and a female screw is formed on the inner circumferential surface of the main part. A ridge is formed, and a synthetic resin shell having locking means formed on the inner peripheral surface of the tamper-evident skirt,
A synthetic resin container lid having a tamper-evidence characteristic, comprising a synthetic resin liner member disposed on the inner surface of the top wall of the shell, and extending radially inward from the female thread. A flexible projecting piece is provided, the shell and the liner member are in a non-bonded or weakly bonded state, and the liner member is separated from the inner surface of the top wall of the shell by a relatively small force, There is provided a synthetic resin container lid, wherein an outer diameter of the liner member is larger than an inner diameter of the protruding piece.

It is preferable that a plurality of the protruding pieces are arranged at intervals in the circumferential direction and shifted in the axial direction.
Each of the projecting pieces can extend so as to incline axially upward inward in the radial direction. An annular shoulder surface facing downward is formed on an upper portion of the inner peripheral surface of the main portion of the skirt wall, and the female thread is formed below the annular shoulder surface. The upper inner peripheral surface above the surface extends substantially vertically, and the inner diameter is substantially the same as or smaller than the inner diameter of the female thread, and the liner member is formed on the inner surface of the top wall of the shell by a synthetic resin. Conveniently, the material is formed by molding and compressing the synthetic resin material, and the outer peripheral surface of the liner is brought into close contact with the upper inner peripheral surface. In a preferable example, a container having a cylindrical mouth / neck portion, in which a male screw thread and an annular locking jaw portion located below the male screw thread are provided on an outer peripheral surface of the mouth / neck portion, Applied, and after filling the container with the contents, by fitting the mouth and neck and rotating in a closing direction, the female thread is screwed to the male thread of the mouth and neck, The locking means is locked to the locking annular jaw, and the liner member is attached to the mouth and neck by bringing the liner member into close contact with the upper end of the mouth and neck, and then negative pressure is generated in the container. To be done.

[0010]

In the container lid of the present invention, when the container lid is attached to the mouth and neck of the container as required and the mouth and neck is sealed, the container lid is opened and rotated about 100 to 150 degrees, for example. When rotated, the shell of the container lid is moved upward with respect to the mouth and neck, but the liner member arranged on the inner surface of the top wall of the shell is in close contact with the upper end of the mouth and neck. It continues to be maintained and is separated downward from the inner surface of the top wall of the shell, thus maintaining the mouth-neck seal unbroken. When the container lid is further rotated in the opening rotation direction, the circumferential break line (and the axial break line) formed on the skirt wall of the shell is broken. After that, the protruding piece arranged on the inner peripheral surface of the main portion of the skirt wall starts to interfere with the liner member, and the liner member is prevented from moving downward relative to the shell, and thus the mouth and neck The liner member is spaced upwardly from the upper end of the section, thus breaking the mouth and neck seal.

[0011]

The preferred embodiments of the synthetic resin container lid of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 illustrates a preferred embodiment of a container lid constructed in accordance with the present invention. The container lid, generally designated by the numeral 2, comprises a shell 4, which is conveniently formed from a relatively hard synthetic resin, such as polypropylene or hard polyethylene, and a soft polyethylene or EVA (ethylene-vinyl acetate copolymer). And a liner member 6 which is conveniently formed from a relatively soft synthetic resin such as

The shell 4 has a circular top wall 8 and a cylindrical skirt wall 10 depending from the peripheral edge of the top wall 8. The skirt wall 10 has a circumferential breaking line 1 extending in the circumferential direction.
2 is formed, and the skirt wall 10 is partitioned into a main portion 14 above the circumferential break line 12 and a tamper-evidence skirt 16 below the circumferential break line 12. More detailed description of the circumferential break line 12,
A downwardly facing annular shoulder surface 18 is formed in the lower portion of the skirt wall 10, and the inner diameter of the skirt wall 10 below the annular shoulder surface 18 is smaller than the inner diameter of the skirt wall 10 above the annular shoulder surface 18. Is also set somewhat larger. Then, immediately below the annular shoulder portion 18,
A plurality of ribs 20 extending in the axial direction are formed on the inner peripheral surface of the skirt wall 10 at intervals in the circumferential direction. The circumferential break line 12 is formed by applying a cutting blade from the outer peripheral surface of the skirt wall 10 to cut the skirt wall 10 leaving the radially inner portion of the rib 20. The cutting of the skirt wall 10 is performed not over the entire circumferential direction but leaving a part in the circumferential direction, and the part where the cutting is not performed constitutes the non-breaking bridging portion 22. And
The non-cut portion remaining on the inner side in the radial direction of the rib 20 constitutes a normal bridging portion 24. The tamper-evidence hem portion 16 below the circumferential breaking line 12 has the non-breaking bridging portion 22.
And is connected to the main portion 14 via a normal bridging portion 24.

On the outer peripheral surface of the main portion 14 of the skirt wall 10, a large number of ridges 26 extending in the axial direction are formed at intervals in the circumferential direction. The lower end of the ridge 26 for preventing the slipping of the fingers hung there is located slightly above the lower end of the main portion 14, and the outer peripheral surface of the skirt wall 10 is downward below the ridge 26. It extends radially outwardly with a relatively large inclination angle and extends further downward radially with a relatively small inclination angle. Continuing the description with reference to FIG. 2 together with FIG. 1, a downwardly facing annular shoulder surface 28 is formed at the upper portion of the inner peripheral surface of the main portion 14 of the skirt wall 10.
The inner diameter D1 of the inner peripheral surface above 8, ie, the upper inner peripheral surface 30 is set smaller than the inner diameter of the inner peripheral surface below the annular shoulder surface 28, that is, the inner peripheral surface 32 of the intermediate portion. The upper inner peripheral surface 30 extends substantially vertically, and the upper end thereof is smoothly connected to the inner surface of the top wall 8 through an arc. An annular shoulder surface 34 that faces downward is also formed in the lower portion of the inner peripheral surface of the main portion 14 of the skirt wall 10, and the inner peripheral surface below this annular shoulder surface 34, that is, the lower inner peripheral surface 36 has the above-described inner diameter. It is set to be larger than the inner diameter of the intermediate inner peripheral surface 32. The inner peripheral surface 32 of the intermediate portion and the inner peripheral surface 36 of the lower portion also extend substantially vertically. A female thread 38 is formed on the inner peripheral surface 32 of the intermediate portion of the main portion 14 of the skirt wall 10.
Are formed. The inner diameter D2 defined by the radially inner end of the female thread 38 is set to be substantially the same as or slightly larger than the inner diameter D1 of the upper inner peripheral surface 30. Interrupted regions 40 are formed in the female thread 38 at a plurality of positions at intervals in the circumferential direction (see FIG. 3 as well as FIG. 1). Such an interruption area 40 forms a ventilation path extending in the axial direction.

Continuing the description with reference to FIG. 1, the tamper-evidence skirt 16 is also formed with an annular shoulder surface 42 facing downward, and the inner peripheral surface 44 above the annular shoulder surface 42. The inner diameter is set to be smaller than the inner diameter of the inner peripheral surface 46 below the annular shoulder surface 42. And
On the inner peripheral surface 46 below the annular shoulder surface 42, a plurality of locking flap pieces 48 are formed at intervals in the circumferential direction. Each of the locking flap pieces 48 constituting the locking means is provided with a container lid 2 when mounting the container lid 2 on the mouth and neck of the container from the base edge connected to the inner peripheral surface 46 as described later. Closed rotation direction (clockwise when viewed from above in Fig. 1)
And extends inward in the radial direction with an inclination in the opposite direction.
The base edge of each of the locking flap pieces 48 also extends downward from the upper end connected to the annular shoulder surface 42 in the axial direction in a direction opposite to the closing rotation direction. A thin curl 50 is attached to the lower end of the tamper-evidence hem portion 16. The thin curl 50 is initially formed into a shape that extends substantially vertically downward, as shown by the chain double-dashed line in FIG. 1, and is then transformed into a curl having the shape shown by the solid line by operating a heated curl tool. By doing so, it is conveniently formed (for the formation of the thin curl 50, see, for example, Japanese Patent Application Laid-Open No. 4-311461). The tamper-evidence hem portion 16 further includes an axial breaking line 5 extending downward from an upper end of the circumferential breaking line 12 adjacent to one end of the non-breaking bridging portion 22.
2 is also formed. This axial breaking line 52
In the cutting process for forming the circumferential break line 12, the tamper-evidence skirt 16 is partially cut from the outer peripheral surface or the inner peripheral surface at a specific angular position, rather than the entire thickness direction. It can be conveniently constructed from the so-called scores that are formed.

Referring to FIGS. 2 and 3 together with FIG. 1, in the shell 4 of the synthetic resin container lid 2 constructed according to the present invention, the intermediate portion inner peripheral surface 32 of the main portion 14 of the skirt wall 10 is formed. Is three flexible protruding pieces 54a, 5
4b and 54c are provided. It is possible to form two projecting pieces at appropriate intervals in the circumferential direction, but it is preferable to arrange three or more projecting pieces at equal angular intervals in the circumferential direction. Further, it is preferable that the axial positions of the projecting pieces 54a, 54b, and 54c are displaced from each other. As clearly understood from FIG. 3, in the illustrated embodiment, three projecting pieces 54a, 54b and 54c are arranged at equal angular intervals in the circumferential direction, and the three projecting pieces 54a are arranged. , 54b and 54c are located in the interruption area 40 of the female thread 38. The internal thread 38 is inclined in the axial direction and extends in the circumferential direction, and as a result, the axial position of the interruption region 40 is gradually displaced, so that the three projecting pieces 54 are formed.
The axial positions of a, 54b, and 54c are also shifted from each other in correspondence with the inclination of the female thread 38. More specifically,
The protruding piece 54b is located slightly below the protruding piece 54a,
The protruding piece 54c is located slightly below the protruding piece 54b. As clearly shown in FIGS. 1 and 2, the protruding piece 54
Each of a, 54b and 54c is extended radially inward from the intermediate portion inner peripheral surface 32 of the main portion 14 of the skirt wall 10 in the interrupted region 40 of the female thread 38, beyond the female thread. There is. Projecting pieces 54a, 54b and 54c
The inner diameter D3 defined by the inner end in the radial direction is smaller than the inner diameter D1 of the upper inner peripheral surface 30 of the main portion 14 of the skirt wall 10. Protruding pieces 54a, 5
4b and 54c each extend radially inward substantially horizontally or axially upwardly inclined (the projections 54a, 54b and 54c in the illustrated embodiment are slightly axially upwardly inclined). Advantageously, it is a plate-shaped piece (extending).

The shell 4 as described above can be conveniently formed by performing the following manufacturing process. Initially, no cutting has been performed to define the circumferential break line 12 and the axial break line 52, and the thin curl 50 extends straight as shown in phantom in FIG. It is formed by compression molding or injection molding from an appropriate synthetic resin. In this case,
Along with the female thread 38 disposed on the inner peripheral surface 32 of the intermediate portion of the main portion 14 of the skirt wall 10, the projecting pieces 54a, 54b and 54 disposed in the interruption area 40 of the female thread 38.
Since c produces a so-called undercut, as long as molding is performed using a normal molding die, when the molded product is released from the molding die, the female screw 38 and the protruding piece 54a,
Due to 54b and 54c, so-called forced removal is performed. Since the projecting pieces 54a, 54b and 54c have flexibility, the projecting pieces 54a, 54b are caused by the excessive pulling.
And 54c are deformed slightly below the state shown in FIGS. However, the protruding piece 54a,
Deformations such as 54b and 54c are corrected during molding of the liner member 6, as will be described in more detail below. The compression molding or injection molding method itself may be a known method as described in detail in JP-A-58-51116. Then, the cutting process as described above is performed to form the circumferential break line 12 and the axial break line 52. Further, after the cutting step or before the cutting step, a curl step is performed to form a thin curl 50 curled into a desired shape.

Continuing the description with reference to FIGS. 1 and 2,
The liner member 6 is arranged on the inner surface of the top wall 8 of the shell 4. The liner member 6 has a disc shape as a whole, has a relatively thin central portion and a relatively thick peripheral portion, and has two concentric protrusions projecting downward in the peripheral portion,
That is, the outer ridge 56 and the inner ridge 58 are formed.
Such a liner member 6 can be conveniently formed as follows. The shell 4 is held upside down, that is, in a state in which the shell 4 is turned upside down with respect to the state shown in FIG. 1, and the synthetic resin material in a softened and melted state is supplied to the inner surface of the top wall 8. Then, as shown by the chain double-dashed line in FIG.
0 is inserted into the shell 4 and moved to the position shown in the figure to compress and mold the synthetic resin material into the liner member 6 having a required shape. The embossing tool 60 includes a cylindrical central punch 62, a cylindrical intermediate bushing 64, and a cylindrical outer sleeve 66. The outer diameter of the tip outer peripheral surface of the outer sleeve 66 is substantially the same as the inner diameter D1 of the upper inner peripheral surface 30 of the main portion 14 of the skirt wall 10, and the tip outer peripheral surface of the outer sleeve 66 is the main portion of the skirt wall 10. Upper inner peripheral surface 3 at 14
0, thus preventing the synthetic resin material from flowing along the upper inner peripheral surface 30 of the main portion 14 of the skirt wall 10. The outer peripheral surface of the liner member 6 thus formed is the main portion 14 of the skirt wall 10.
And the outer diameter D
4 is substantially the same as the inner diameter D1 of the upper inner peripheral surface 30, and is therefore somewhat larger than the inner diameter D3 defined by the radially inner end of the projecting piece 54, at the radially inner end of the female thread 38. Therefore, the inner diameter D2 is substantially the same as or slightly smaller than the inner diameter D2. As will be readily understood by reference to FIG. 1, when the embossing tool 60 is inserted into the shell 4 and moved to the position shown, the outer sleeve 66
Interferes with the tips of the protruding pieces 54a, 54b and 54c,
Due to the interference of the outer sleeve 66, the protruding pieces 54a, 54b, and 5 which are deformed somewhat downward in the axial direction due to the forced removal at the time of separation from the molding die as described above.
4c is deformed upward in the axial direction to be corrected into a desired shape.

In the container lid 2 constructed according to the present invention, the liner member 6 is in a non-adhered or weakly adhered state with respect to the shell 4, and the liner member 6 has an inner surface of the top wall 8 of the shell 4 with a relatively small force. It is important to be separated from. To meet such requirements, for example, shell 4
Before the synthetic resin material is supplied to the inner surface of the top wall 8 of the shell 4, the inner surface of the top wall 8 of the shell 4 and the upper inner peripheral surface 30 of the main portion 14 of the skirt wall 10 are bonded with silicone such as a release agent. Inhibitors can be applied. By selecting a synthetic resin having a low mutual adhesiveness to the synthetic resin molded in the shell 4 as a synthetic resin material for molding the liner member 6 without taking any special means such as application of an adhesion inhibitor. The above requirements can also be satisfied. Since the liner member 6 can be easily separated from the top surface wall 8 of the shell 4, the shell 4 can be easily conveyed while the container lid 2 is being conveyed.
Although the liner member 6 can be spaced apart from the top surface wall 8 of the skirt wall 10 and moved downward, when the liner member 6 moves downward, a plurality of protruding pieces formed on the intermediate portion inner peripheral surface 32 of the main portion 14 of the skirt wall 10 54a, 54b and 54c interfere with the peripheral edge of the liner member 6 to prevent the liner member 6 from moving further downward, thus reliably preventing the liner member 6 from falling off the shell 4. If desired, instead of molding the liner member 6 in the shell 4 as described above, the liner member 6 may be formed separately from the shell 4 and inserted into the shell 4 to insert the liner member 6 into the inner surface of the top wall 8. It can also be located at. In this case, the liner member is separated from the inner surface of the top wall 8 of the shell 4 with a comparatively small force without paying particular attention to the application of the adhesion inhibitor or the selection of the synthetic resin material to be molded into the liner member. The requirement can be sufficiently satisfied.

FIG. 4 shows a state in which the container lid 2 as described above is attached to the mouth-neck portion 68 of the container and the mouth-neck portion 68 is sealed. The mouth-neck portion 68 of the container, which may be formed of a suitable synthetic resin such as polyethylene terephthalate or glass, may be of a well-known form, is generally cylindrical, and has a male thread 70 and a lower portion thereof on the outer peripheral surface thereof. And an annular locking jaw 72 located at. When the content to be filled in the container is, for example, fruit juice, the content normally heated to the required sterilization temperature is filled into the container, or after filling the container, the content is heated to the required sterilization temperature, and then the container The container lid 2 is attached to the mouth / neck portion 68. When the container lid 2 is attached, the container lid 2 is fitted on the mouth / neck portion 68 and rotated in the closing rotation direction, that is, in the clockwise direction when viewed from above in FIG. Is screwed onto the male thread 70 of the mouth / neck portion 68. The locking flap piece 48 formed on the tamper-evidence skirt portion 16 of the shell 4 of the container lid 2 is interfered by the locking jaw portion 72 of the mouth / neck portion 68 and is elastically deformed upward to form an annular engagement. Stop jaw 72
After passing through, it is elastically restored and locked to the annular locking jaw 72. Liner member 6 of container lid 2
Is brought into close contact with the upper end of the mouth / neck portion 68, thereby sealing the mouth / neck portion 68. When the contents and air in the container drop to room temperature, a negative pressure is generated in the container due to cooling contraction of the air.

To open the mouth-neck portion 68 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 38 formed on the shell 4 of the container lid 2 moves along the male thread 70 of the mouth / neck portion 68, so that the shell 4 is raised with rotation. However, in the tamper-evidence skirt portion 16 of the shell 4, the locking flap piece 48 formed on the inner peripheral surface 46 thereof is locked on the lower surface of the annular locking jaw portion 72 formed on the mouth / neck portion 68. Therefore, the upward movement is prevented. Thus, as will be readily understood by referring to FIGS. 5 and 6 in conjunction with FIG. 4, considerable stress is created in the bridging portion 24 at the circumferential break line 12 formed in the skirt wall 10 of the shell 4. ,
The bridge portion 24 is broken, leaving the non-broken bridge portion 22. Further, a considerable amount of stress is also generated in the axial breaking line 52 formed on the tamper-evidence skirt portion 16, and the axial breaking line 52 is also broken. Due to such breakage, the tamper-evidence hem portion 16 is expanded from an endless annular shape to an endless belt shape, and the annular locking jaw portion 72 of the mouth / neck portion 68 is formed.
The engagement of the engagement flap piece 48 with respect to is released. After that, the entire shell 4 including the tamper-evidence skirt 16 can be lifted.

On the other hand, regarding the liner member 6 of the container lid 2, the liner member 6 is in a non-adhered or weakly adhered state with respect to the shell 4, and the liner member 6 has an inner surface of the top wall 8 of the shell 4 with a relatively small force. Due to the fact that a negative pressure is generated in the container as described above and the liner member 6 is adsorbed to the mouth / neck portion 68 by the negative pressure. As shown in FIGS. 5 and 6, the liner member 6 is kept in close contact with the upper end portion of the mouth / neck portion 68 without being raised together with the shell 4, so that the mouth / neck portion 68 is sealed. It is maintained without being damaged, and the liner member 6 is moved down relative to the shell 4 and separated downward from the inner surface of the top wall 8. For a while after the circumferential break line 12 and the axial break line 52 are broken as described above, the liner member 6 does not rise in association with the rising of the shell 4 and the upper end of the mouth / neck portion 68 does not rise. Maintained in close contact with the department. As the shell 4 continues to move upward, as shown in FIGS. 6 and 7, the three protruding pieces 54a, 54b and 54c formed on the inner peripheral surface 32 of the intermediate portion of the main portion 14 of the skirt wall 10 of the shell 4 are shown. Sequentially interfere with the outer peripheral edge portion of the liner member 6, more specifically, the outer peripheral edge portion of the lower end of the outer protrusion 56 (that is, the uppermost protruding piece 54a in the axial direction first interferes with the liner member 6). , And then the protruding piece 5 located in the middle in the axial direction
4b interferes with the liner member 6, and then the lowermost protruding piece 54c in the axial direction interferes with the liner member 6), and the liner member 6 descends relative to the shell 4 by such interference. Is prevented. Therefore, the liner member 6 is attached to the shell 4 sequentially from the specific angle portion (the portion where the protruding piece 54a starts to interfere), and thus in a state of being slightly inclined with respect to the horizontal as the liner member 6 as a whole is attached to the shell 4 It is lifted from the portion 68, and is thus separated from the mouth / neck portion 68 sequentially from the specific angle portion. Once the liner member 6 is separated from the mouth neck 68, the interior of the container is exposed to the outside between the mouth neck 68 and the liner member 6 and also through the vent passage defined by the interrupted region 40 of the female thread 38. Can communicate. As shown in FIG. 8, the shell 4 continues to move upward, the liner member 6 also moves upward accordingly, and the entire container lid 2 is detached from the mouth / neck portion 68.

Thus, the liner member 6 is separated from the mouth / neck portion 68 and the sealing of the mouth / neck portion 68 is released.
The circumferential break line 12 formed on the skirt wall 10 of the shell 4 and the axial break line 52 formed on the tamper-evident hem 16 are broken as required to form the mouth / neck portion 68. This is after the engagement of the engagement flap piece 48 formed on the tamper-evidence skirt 16 with respect to the annular engagement jaw 72 is released. Therefore, the circumferential break line 12 and the axial break line 52
It is practically impossible to release the seal of the mouth / neck portion 68 without causing the breakage of the seal, that is, without leaving the trace of the opening operation. When the mouth / neck portion 68 is opened, the circumferential break line 12 and the axial break line 52 are always broken prior to this opening.

As can be understood by comparing FIGS. 5 and 6 with FIG. 4, the liner member 6 is lowered relative to the shell 4, and the outer peripheral surface of the liner member 6 is a skirt of the shell 4. When the wall 10 is disengaged downward from the upper inner peripheral surface 30 of the main portion 14, the mouth / neck portion 68 and the inner surface of the top wall 8 of the shell 4 and the skirt wall 1 until then.
0, the restraint of the liner member 6 which has been compressed between itself and the upper inner peripheral surface 30 of the main portion 14 is released, and therefore the lower outer peripheral surface of the outer protrusion 56 of the liner member 6 is somewhat radially outward. It is bulged. Therefore, as will be understood by referring to FIG. 6, the inner diameter D2 (FIG. 2) defined by the radially inner end of the female thread 38 is larger than the skirt wall 10.
Inner diameter D1 of the upper inner peripheral surface 30 of the main portion 14 at (FIG. 2)
When and are substantially the same or slightly smaller than this, the upper end portion of the female thread 38 starts to interfere with the liner member 6 before the protruding piece 54a starts to interfere with the liner member 6. Although the interference of the female thread 38 with the liner member 6 is relatively small, the relative lowering of the liner member 6 with respect to the shell 4 is prevented by such interference, and as a result, the specific angle portion of the liner member 6 is locally opened. There is also a possibility that the mouth / neck portion 68 may be separated from the neck portion 68 and the seal of the mouth / neck portion 68 may be released. Due to insertion or the like, the upper inner peripheral surface 3 of the main portion 14 of the skirt wall 10
Since it is restricted to substantially the same as or outside 0, the above possibility is relatively small, and in order to reliably prevent the lowering of the liner member 6 relative to the shell 4, the protruding piece 54
It is necessary to provide a, 54b and 54c).
Therefore, regarding the disposition of the female thread 38, the female thread 38 is attached to the liner member 6 which is closely attached to the upper end portion of the mouth / neck portion 68 after the circumferential break line 12 and the axial break line 52 are broken. Are arranged so as to face each other (in other words, the female thread 38 does not interfere with the liner member 6 before the circumferential break line 12 and the axial break line 52 are broken). Is preferred.

If it is desired to temporarily reseal the mouth / neck 68 after the entire container lid 2 has been detached from the mouth / neck 68 as described above, the shell 4 of the shell 4 may be replaced as necessary. Non-breaking bridging portion 22 in the circumferential breaking line 12
After the tamper-evidence hem 16 is removed by breaking the container, the container lid 2 is re-fitted on the mouth / neck 68 and the shell 4
The female thread 38 may be screwed onto the male thread 70 of the mouth / neck portion 68. Thus, the liner member 6, which is prevented from being separated from the shell 4 due to the presence of the protruding pieces 54a 54b and 54c, is again brought into close contact with the upper end portion of the mouth / neck portion 68, thereby temporarily temporarily sealing the mouth / neck portion 68. It

9 and 10 illustrate a modified embodiment of a container lid constructed in accordance with the present invention. 9 and 1
In the container lid 102 shown in FIG. 0, the inner peripheral surface 1 of the intermediate portion of the main portion 114 of the skirt wall 110 of the shell 104
The female thread 138 formed on 32 is continuously extended, and the female thread 138 has no interruption area. Then, three projecting pieces (only one of which is shown 154 a) are projected inward in the radial direction from the radially inner end of the female thread 138. If desired
Instead of disposing a plurality of projecting pieces projecting radially inward from the female thread 138 at appropriate intervals in the circumferential direction,
A female screw 138 is provided with a protruding piece that extends continuously in the circumferential direction.
It can also be formed. Other configurations of the container lid 102 shown in FIGS. 9 and 10 are substantially the same as those of the container lid 2 described above.

In the embodiments and variants described above, the tamper-evident skirts 16 of the shells 4 and 104.
And 116 are formed with axial break lines 52 and 152, but if desired, such axial break lines 52 and
And 152 can be omitted. In this case, when opening the mouth and neck of the container, the circumferential break lines 12 and 112 are broken along the entire circumferential direction, and the tamper-evidence skirts 16 and 116 are skirt walls 10 and 110.
Separated from the main portions 14 and 114 of the tamper, the tamper-evidence hem portions 16 and 116 remain there without being disengaged from the mouth and neck.

[0028]

According to the container lid of the present invention, the mouth-neck portion of the container can be sealed without breaking the circumferential breaking line (and the axial breaking line) of the container lid and thus leaving no trace. Is virtually impossible to destroy,
If the mouth-neck seal of the container is broken, the circumferential break line (and axial break line) is always broken prior to this.

[Brief description of drawings]

FIG. 1 is a cross-sectional side view of a preferred embodiment of a container lid constructed in accordance with the present invention with a partial cross-section and a partial side view.

FIG. 2 is a partial cross-sectional view showing a part of the container lid of FIG.

FIG. 3 is a development view showing a female thread and a protruding piece formed on the shell of the container lid of FIG.

FIG. 4 is a cross-sectional side view showing a state in which the container lid of FIG. 1 is attached to the mouth-neck portion of the container and the mouth-neck portion is sealed, in which a part is a cross section and a part is a side view.

FIG. 5 is a partial cross-sectional view showing the behavior of the container lid in the first stage when the container lid is rotated in the opening rotation direction to open the mouth / neck portion from the state shown in FIG.

FIG. 6 is a partial cross-sectional view showing the behavior of the container lid in the second stage when the container lid is rotated in the opening rotation direction to open the mouth / neck portion from the state shown in FIG.

FIG. 7 is a partial cross-sectional view showing the behavior of the container lid in the third stage when the container lid is rotated in the opening rotation direction to open the mouth and neck from the state shown in FIG.

8 is a partial cross-sectional view showing the behavior of the container lid in the fourth stage when the container lid is rotated in the opening rotation direction to open the mouth and neck from the state shown in FIG.

FIG. 9 is a cross-sectional side view of a modified embodiment of the container lid constructed according to the present invention, showing a partial cross section and a partial side view.

10 is a partial cross-sectional view showing a part of the container lid of FIG.

[Explanation of symbols]

 2: Container lid 4: Shell 6: Liner member 8: Top wall 10: Skirt wall 12: Circumferential break line 14: Main part of skirt wall 16: Tamper evidence hem 28: Annular shoulder surface 30: Upper inner circumferential surface 38: female thread 40: interruption area 48: locking flap piece (locking means) 52: axial breaking line 54a: protruding piece 54b: protruding piece 54c: protruding piece 68: mouth / neck 70: male thread 72: Annular locking jaw 102: Container lid 112: Circumferential break line 104: Shell 110: Skirt wall 114: Skirt wall main part 116: Tamper evidence hem 138: Female thread 152: Axial break line 154a: Projection Piece

Claims (6)

[Claims] 1. A top surface wall and a cylindrical skirt wall hanging down from a peripheral edge of the top surface wall, wherein a rupture line extending in a circumferential direction is formed in the skirt wall, and the skirt wall has the peripheral surface. It is divided into a main part above the direction breaking line and a tamper-evidence skirt below the circumferential breaking line, and a female thread is formed on the inner peripheral surface of the main part, Tamper evidence A tamper evidence consisting of a synthetic resin shell having locking means formed on the inner peripheral surface of the skirt and a synthetic resin liner member provided on the inner surface of the top wall of the shell. In a synthetic resin container lid having characteristics, the female thread is provided with interrupted regions at a plurality of circumferentially spaced portions, and on the inner peripheral surface of the main portion of the skirt wall. Are circumferentially spaced and the interrupted region of the female thread A plurality of positioned flexible projections are provided, each of the projections extending radially inward beyond a radially inner edge of the female thread; The shell and the liner member are in a non-bonded or weakly bonded state, the liner member is separated from the inner surface of the top wall of the shell by a relatively small force, and the outer diameter of the liner member is the inner diameter of the protruding piece. A container lid made of synthetic resin characterized by being larger than. 2. A top surface wall and a cylindrical skirt wall that hangs down from the peripheral edge of the top surface wall, and a rupture line extending in the circumferential direction is formed on the skirt wall, and the skirt wall has the periphery line. It is divided into a main part above the direction breaking line and a tamper-evidence skirt below the circumferential breaking line, and a female thread is formed on the inner peripheral surface of the main part, Tamper evidence A tamper evidence consisting of a synthetic resin shell having locking means formed on the inner peripheral surface of the skirt and a synthetic resin liner member provided on the inner surface of the top wall of the shell. In a synthetic resin container lid having characteristics, a flexible projecting piece extending inward in the radial direction from the female thread is provided, and the shell and the liner member are non-adhered or weakly adhered. The liner member is in a state of Spaced apart from the inner surface of the Le of the top wall, the outer diameter of the liner member is larger than the inner diameter of the projecting piece, plastic container closure, characterized in that. 3. The synthetic resin container lid according to claim 1, wherein a plurality of the projecting pieces are arranged at intervals in the circumferential direction and displaced in the axial direction. 4. The composite according to claim 1, wherein each of the projecting pieces extends inward in the radial direction substantially horizontally or inclined upward in the axial direction. Resin container lid. 5. A downwardly facing annular shoulder surface is formed on an upper portion of the inner peripheral surface of the main portion of the skirt wall, and the female thread is formed below the annular shoulder surface. The upper inner peripheral surface above the annular shoulder surface extends substantially vertically, and the inner diameter is substantially the same as or smaller than the inner diameter of the female thread, and the liner member is the top wall of the shell. The synthetic resin material is supplied to the inner surface of the base material and is molded by compressing the synthetic resin material, and the outer peripheral surface of the liner is brought into close contact with the upper inner peripheral surface according to any one of claims 1 to 4. Synthetic resin container lid. 6. A container having a cylindrical mouth-neck portion, in which an external thread and an annular locking jaw located below the external thread are arranged on the outer peripheral surface of the mouth-neck section. Applied, and after filling the container with the contents, by fitting the mouth and neck and rotating in a closing direction, the female thread is screwed to the male thread of the mouth and neck, Locking the locking means to the locking annular jaw,
The method according to any one of claims 1 to 5, wherein the liner member is attached to the mouth / neck portion by bringing the liner member into close contact with the upper end portion of the mouth / neck portion, and then a negative pressure is generated in the container. Synthetic resin container lid.