JP3306732B2 - Synthetic resin container lid with tamper-evident properties - 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 having a so-called tamper-evident characteristic in which the trace is clearly left once the mouth and neck of the container are opened. The present invention relates to a synthetic resin container lid having a tamper-evident characteristic, which is advantageously used when a negative pressure is generated in a container in a state where the mouth and neck are sealed while wearing the container.

[0002]

2. Description of the Related Art As a container lid having a tamper-evint characteristic for containers for beverages and the like, for example, Japanese Patent Application Laid-Open No. Sho 60-1484
No. 63 or Japanese Patent Application Laid-Open No. 61-104959 has proposed a synthetic resin container lid which is widely used in practice. Such a synthetic resin container lid comprises a synthetic resin shell and a synthetic resin liner member. The shell has a circular top wall and a cylindrical skirt wall that hangs down from the periphery of the top wall, and a rupture line extending in the circumferential direction is formed on the skirt wall. It is partitioned into an upper main portion and a tamper-evident hem portion below the circumferential breaking 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 hem. The liner member is disposed on the inner surface of the top wall of the shell.

[0003] 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 and neck. When a container lid is attached to the mouth and neck of the container to seal the mouth and neck, the container lid is fitted to the mouth and neck and rotated in the closing rotation direction, and the female thread of the container lid and the mouth and neck are rotated. And the male thread. By the screwing 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-evident foot 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 on 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 and neck, thereby sealing the mouth and neck. To open the mouth and neck of the container, the container lid is rotated in the opening rotation direction. Thus, the female thread of the container lid is moved along the male thread of the mouth and neck, 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 hem is locked to the annular locking chin of the mouth and neck, the tamper-evidence hem is prevented from moving upward. Thus, the circumferential breaking line formed on the skirt wall is broken, and the tamper-evident hem is separated from the main part of the skirt wall. Thereafter, the rest of the container lid is removed from the mouth and neck, leaving the tamper-evident hem at the mouth and neck, and thus the mouth and neck are opened. If an axial break line is formed at the bottom of the Taper Evidence, the circumferential break line is broken not by extending over the entire circumferential direction but by leaving a part, and the axial break line is broken. The hem portion of the evidence is developed from an endless annular shape to an end strip shape, the locking means is released from the annular locking jaw of the mouth and neck, and the entire container lid is released from the mouth and neck.

[0004]

However, the conventional container lid of the above-described embodiment 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 are sealed, when the container lid is rotated, for example, about 100 to 150 degrees in the opening rotation direction, it is disposed on the inner surface of the top wall. The liner member is separated upward from the upper end of the mouth and neck, thus breaking the seal of the mouth and neck, but the circumferential break line (and the axial break line) is still intact without breaking. And therefore the mouth and neck seal is already broken,
Therefore, there is a possibility that the contents may be deteriorated, but there may be a case where no trace indicating that the contents themselves are generated is generated at all. In particular, when the contents are juice drinks, the contents are heat-sterilized prior to sealing the mouth and neck,
When the contents are cooled to room temperature after the container lid is fitted to the mouth and neck, a negative pressure is generated in the container. However, when the sealing of the mouth and neck is broken as described above, the outside air flows into the container. To enter,
Due to this, the contents may be corroded.

The present invention has been made in view of the above-mentioned facts, and a technical problem to be solved is to improve a synthetic resin container lid so that a circumferential break line (and an axial break line) of the container lid is locally formed. It is virtually impossible to break the seal of the mouth and neck without producing a break.

[0006]

In order to solve the above-mentioned technical problem, according to the present invention, a plurality of female threads formed on an inner peripheral surface of a main portion of a skirt wall are circumferentially spaced. A plurality of flexible projecting pieces which are arranged at intervals in the circumferential direction and are located in the above-mentioned interrupted area of the female thread, and Each of the strips extends radially inward beyond the radially inner edge of the female thread. Alternatively, a flexible protruding piece extending 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 brought into a non-adhered or weakly adhered state, the liner member is configured to be 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 set to a protruding piece. Larger than the inside diameter of

That is, according to one aspect of the present invention, there is provided a top wall and a cylindrical skirt wall hanging down from a periphery of the top wall,
A break line extending in the circumferential direction is formed on the skirt wall, and the skirt wall has a main portion above the circumferential break line and a tamper-evident hem below the circumferential break line. A synthetic resin shell in which a female thread is formed on the inner peripheral surface of the main portion, and a locking means is formed on the inner peripheral surface of the tamper-evident hem portion, A synthetic resin liner member having a tamper-evident characteristic, comprising a synthetic resin liner member disposed on the inner surface of the top wall of the shell, wherein a plurality of the female threads are circumferentially spaced. And an interruption area is provided at the portion of the skirt wall, which is circumferentially spaced on the inner peripheral surface of the main portion of the skirt wall and is located in the interruption area of the internal thread. A plurality of flexible protrusions are provided, and each of the protrusions is Is extended radially inward beyond the radially inner edge of the internal thread, the shell and the liner member are in a non-adhered or weakly adhered state, and the liner member has a relatively small force. Wherein the outer diameter of the liner member is larger than the inner diameter of the protruding piece, the container lid made of synthetic resin being provided at a distance from the inner surface of the top wall of the shell.

According to another aspect of the present invention, there is provided a top wall and a cylindrical skirt wall hanging down from a periphery of the top wall, and a break line extending in a circumferential direction is formed on the skirt wall. The skirt wall is divided into a main portion above the circumferential breaking line and a tamper-evident hem portion below the circumferential breaking line, and a female screw is formed on an inner peripheral surface of the main portion. A ridge is formed, and a synthetic resin shell in which a locking means is formed on the inner peripheral surface of the tamper-evident hem,
A synthetic resin liner member having a tamper-evident property, 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 protrusion is disposed, the shell and the liner member are in a non-adhered or weakly adhered state, and the liner member is separated from the inner surface of the top wall of the shell by a relatively small force; An outer diameter of the liner member is larger than an inner diameter of the protruding piece, so that a synthetic resin container lid is provided.

Preferably, a plurality of the protruding pieces are arranged at intervals in the circumferential direction and shifted in the axial direction.
Each of the protruding pieces can extend obliquely inward in the axial direction toward the inside in the radial direction. A downwardly facing annular shoulder surface is formed at 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 its inner diameter is substantially the same as or smaller than the inner diameter of the female thread, and the liner member is formed of a synthetic resin on the inner surface of the top wall of the shell. It is formed by supplying a material 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 preferred embodiment, the container has a cylindrical mouth and neck, and a male thread and an annular locking jaw located below the male thread are arranged on the outer peripheral surface of the mouth and neck. After the container is filled with the contents, the female screw is screwed into the male screw of the mouth and neck by being fitted to the mouth and neck and rotating in the closing direction. 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. Thereafter, a negative pressure is generated in the container. Is done.

[0010]

According to 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 are sealed, the container lid is, for example, about 100 to 150 degrees in the opening rotation direction. When rotated, the shell of the container lid is moved upward with respect to the mouth and neck, but the liner member disposed on the inner surface of the top wall of the shell is in a state of being in close contact with the upper end of the mouth and neck. It continues to be maintained and separates downwardly from the inner surface of the top wall of the shell, thus maintaining the cervical seal without breaking. When the container lid is further rotated in the opening rotation direction, the circumferential breaking line (and the axial breaking line) formed on the skirt wall of the shell is broken. Thereafter, the protruding pieces disposed on the inner peripheral surface of the main portion of the skirt wall begin to interfere with the liner member, and the liner member is prevented from moving downward relative to the shell, and thus the neck and neck The liner member is spaced upwardly from the upper end of the section, thus breaking the mouth and neck seal.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the synthetic resin container lid of the present invention will be described below in detail 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 of a relatively rigid 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 advantageously formed of a relatively soft synthetic resin as described above.

The shell 4 has a circular top wall 8 and a cylindrical skirt wall 10 hanging from the periphery of the top wall 8. A circumferential breaking line 1 extending in the circumferential direction is provided on the skirt wall 10.
2, the skirt wall 10 is divided into a main portion 14 above the circumferential breaking line 12 and a tamper-evident foot 16 below the circumferential breaking line 12. The circumferential breaking line 12 will be described in more detail.
A lower portion of the skirt wall 10 is formed with a downwardly facing annular shoulder surface 18. 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. And just below the annular shoulder 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 rupture line 12 is formed by cutting the skirt wall 10 by applying a cutting blade from the outer peripheral surface of the skirt wall 10 and leaving a radially inner portion of the rib 20. The cutting of the skirt wall 10 is performed not in the entire circumferential direction but in a part of the circumferential direction, and a part where the cutting is not performed constitutes the non-ruptured bridging portion 22. And
The non-cut portion remaining on the radially inner side of the rib 20 forms a normal bridge portion 24. The tamper-evident foot 16 below the circumferential breaking line 12 is
And connected to the main part 14 via a normal bridging part 24.

On the outer peripheral surface of the main portion 14 of the skirt wall 10, a 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 slipping of a finger hung there is positioned slightly above the lower end of the main portion 14, and the outer peripheral surface of the skirt wall 10 faces downward below the ridge 26. It is inclined radially outwardly at a relatively large inclination angle and further downwardly radially outwardly at a relatively small inclination angle. 2, the lower part of the main part 14 of the skirt wall 10 is formed with an annular shoulder 28 facing downward.
The inner diameter D1 of the inner peripheral surface above the upper surface 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, ie, the intermediate inner peripheral surface 32. 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 via an arc. An annular shoulder surface 34 facing downward is also formed below the inner peripheral surface of the main portion 14 of the skirt wall 10, and the inner peripheral surface below the annular shoulder surface 34, that is, the inner diameter of the lower inner peripheral surface 36 It is set larger than the inner diameter of the intermediate inner peripheral surface 32. The intermediate portion inner peripheral surface 32 and the lower inner peripheral surface 36 also extend substantially vertically. A female thread 38 is provided on the inner peripheral surface 32 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 substantially the same as or slightly larger than the inner diameter D1 of the upper inner peripheral surface 30. In the internal thread 38, interruption regions 40 are formed at a plurality of positions at intervals in the circumferential direction (see FIG. 3 together with FIG. 1). Such an interruption region 40 forms an air passage extending in the axial direction.

Referring to FIG. 1, the tamper-evident skirt 16 also has a downwardly-facing annular shoulder surface 42 formed thereon, and the inner peripheral surface 44 above the annular shoulder surface 42 is formed. The inner diameter is set smaller than the inner diameter of the inner peripheral surface 46 below the annular shoulder surface 42. And
A plurality of locking flap pieces 48 are formed on the inner peripheral surface 46 below the annular shoulder surface 42 at intervals in the circumferential direction. Each of the locking flap pieces 48 constituting the locking means starts from the base edge connected to the inner peripheral surface 46, as described later, when the container lid 2 is mounted on the mouth and neck of the container. Closing rotation direction (clockwise as viewed from above in FIG. 1)
, And extends inward in the radial direction while being inclined in the opposite direction.
The base edge of each of the locking flap pieces 48 also extends obliquely downward from the upper end connected to the annular shoulder surface 42 in the direction opposite to the closing rotation direction. A thin curl 50 is attached to the lower end of the tamper-evident foot 16. The thin curl 50 is initially formed to extend substantially vertically downward as shown by a two-dot chain line in FIG. 1, and then deformed into a curl as shown by a solid line by the action of a heated curling tool. (For the formation of the thin curl 50, see, for example, JP-A-4-31461). The tamper-evident 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-rupture bridging portion 22.
2 are also formed. Such an axial breaking line 52
In the cutting step for forming the circumferential breaking line 12, at a specific angular position of the tamper-evident foot 16, not the entire thickness direction but a partial cut from the outer circumferential surface or the inner circumferential surface. It can be conveniently constructed from the so-called scores formed.

Referring to FIGS. 2 and 3 together with FIG. 1, in the shell 4 of the synthetic resin container lid 2 constructed in accordance with the present invention, the shell 4 of the main part 14 of the skirt wall 10 has an intermediate inner peripheral surface 32. Are three flexible projecting pieces 54a, 5
4b and 54c are provided. Although two projecting pieces can be formed at appropriate intervals in the circumferential direction, it is preferable to arrange three or more projecting pieces at equal angular intervals in the circumferential direction. Furthermore, the axial positions of the projecting pieces 54a, 54b and 54c are preferably offset from one another. As can be clearly understood from FIG. 3, in the embodiment shown, three projecting pieces 54a, 54b and 54c are arranged at equal angular intervals in the circumferential direction, and the three projecting pieces 54a are provided. , 54b and 54c are located in the interruption region 40 of the female thread 38. The female thread 38 is inclined in the axial direction and extends in the circumferential direction, so that the axial position of the interruption region 40 is gradually shifted, so that the three projecting pieces 54 are provided.
The axial positions of a, 54b and 54c are also shifted from one another in accordance with the inclination of the female thread 38. More specifically,
The projecting piece 54b is located somewhat below the projecting piece 54a,
The projecting piece 54c is located somewhat lower than the projecting piece 54b. As can be clearly seen in FIGS.
Each of a, 54b and 54c is extended radially inward from the intermediate inner peripheral surface 32 of the main portion 14 of the skirt wall 10 beyond the internal thread at the interruption region 40 in the internal thread 38. I have. Projecting pieces 54a, 54b and 54c
Is set smaller than the inner diameter D1 of the upper inner peripheral surface 30 in the main portion 14 of the skirt wall 10. Projecting pieces 54a, 5
4b and 54c each extend radially inward substantially horizontally or axially upward (the projecting pieces 54a, 54b and 54c in the illustrated embodiment are slightly inclined upward in the axial direction). Conveniently a plate-like piece (extending).

The shell 4 as described above can be conveniently formed by performing the following manufacturing steps. First, 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 by the two-dot chain line in FIG. Formed by compression molding or injection molding from an appropriate synthetic resin. In this case,
The projecting pieces 54a, 54b, and 54 are disposed in the interruption region 40 of the female thread 38, together with the female thread 38 disposed on the intermediate inner peripheral surface 32 of the main portion 14 of the skirt wall 10.
Since c generates a so-called undercut, as long as the molding is performed using a normal molding die, when the molded product is detached from the molding die, the projecting pieces 54a,
The so-called forcing is performed due to 54b and 54c. Since the protruding pieces 54a, 54b and 54c are flexible, the protruding pieces 54a, 54b
And 54c are deformed slightly below the condition shown in FIGS. However, the projecting pieces 54a,
Such deformations as 54b and 54c are corrected during the 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, for example, JP-A-58-51116. Thereafter, the above-described cutting process is performed to form the circumferential rupture line 12 and the axial rupture line 52. After or before the cutting step, a curling step is performed to form a thin curl 50 curled into a required form.

Continuing the description with reference to FIGS. 1 and 2,
The liner member 6 is disposed on the inner surface of the top wall 8 of the shell 4. The liner member 6 has a disk shape as a whole, has a relatively thin central portion and a relatively thick peripheral portion, and has two concentric ridges projecting downward at 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 in an inverted state, that is, in a state where the shell 4 is turned upside down with respect to the state shown in FIG. 1, and a softened and molten synthetic resin material is supplied to the inner surface of the top wall 8. Next, as shown by a two-dot chain line in FIG.
0 is inserted into the shell 4 and moved to the position shown in the figure, and the synthetic resin material is compression-molded into a liner member 6 having a required shape. The stamping tool 60 includes a cylindrical central punch 62, a cylindrical intermediate bushing 64, and a cylindrical outer sleeve 66. The outer diameter of the outer peripheral surface of the distal end portion 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 outer peripheral surface of the distal end portion of the outer sleeve 66 is the main portion of the skirt wall 10. Upper inner peripheral surface 3 at 14
0 so that the synthetic resin material is prevented 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 has a main portion 14 of the skirt wall 10.
At its upper inner peripheral surface 30 and its 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, and is located at the radially inner end of the female thread 38. Is substantially the same as or slightly smaller than the inner diameter D2 defined as described above. As will be readily understood with 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 is moved.
Interfere with the tips of the projecting pieces 54a, 54b and 54c,
Due to the interference of the outer sleeve 66, the projecting pieces 54a, 54b, and 5 slightly deformed downward in the axial direction due to forcible removal upon detachment from the mold as described above.
4c is deformed upward in the axial direction and is corrected to a required form.

In the container lid 2 constructed in accordance with the present invention, the liner member 6 is in a non-adhered or weakly adhered state to the shell 4 and the liner member 6 is moved by a relatively small force to the inner surface of the top wall 8 of the shell 4. It is important to be kept away from. In order to satisfy such requirements, for example, the shell 4
Before the synthetic resin material is supplied to the inner surface of the top wall 8 of the shell, an adhesive such as silicone used as a release agent is applied to 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. Inhibitors can be applied. By selecting a synthetic resin having low mutual adhesiveness to the synthetic resin molded into the shell 4 as a synthetic resin material for molding the liner member 6 without taking special measures such as applying an adhesion inhibitor. The above requirements can be satisfied. Since the liner member 6 can be separated sufficiently easily from the top wall 8 of the shell 4, the shell 4
The liner member 6 can move downward while being separated from the top wall 8 of the skirt wall, but when the liner member 6 moves downward, a plurality of protruding pieces formed on the inner peripheral surface 32 of the main part 14 of the skirt wall 10 at the intermediate portion 32 are formed. 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 forming the liner member 6 in the shell 4 as described above, a liner member 6 is formed separately from the shell 4 and the liner member is inserted into the shell 4 to insert the inner surface of the top wall 8. Can also be located. In this case, the liner member is separated from the inner surface of the top wall 8 of the shell 4 by a relatively small force without having to pay special attention to the application of the adhesion inhibitor or the selection of the synthetic resin material to be molded into the liner member. Requirements can be satisfied sufficiently easily.

FIG. 4 shows a state where the container lid 2 as described above is attached to the mouth and neck 68 of the container and the mouth and neck 68 is sealed. The mouth and neck portion 68 of the container, which can be made of a suitable synthetic resin such as polyethylene terephthalate or glass, may be in a known form as a whole, and has a cylindrical shape as a whole. And an annular locking jaw 72 located on When the content to be filled in the container is, for example, fruit juice, usually, the content heated to the required sterilizing temperature is filled in the container, or after filling the container, the content is heated to the required sterilizing temperature, and then the container is heated. The container lid 2 is attached to the mouth and neck 68. When the container lid 2 is mounted, the container lid 2 is fitted on the mouth and neck portion 68 and rotated in the closing rotation direction, that is, clockwise as viewed from above in FIG. Into the male thread 70 of the mouth and neck 68. The locking flap piece 48 formed on the tamper-evident skirt 16 of the shell 4 of the container lid 2 is elastically deformed upward by the interference with the locking jaw 72 of the mouth-neck portion 68, and the ring-shaped engaging member is formed. Stop jaw 72
After passing through, it is elastically restored and is 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 and neck 68, thereby sealing the mouth and neck 68. When the contents and air in the container decrease to room temperature, a negative pressure is generated in the container due to the cooling shrinkage of the air.

In order to open the mouth and neck 68 of the container, the container lid 2 is rotated in the opening rotation direction, that is, counterclockwise as viewed from above in FIG. As a result, the female thread 38 formed on the shell 4 of the container lid 2 moves along the male thread 70 of the mouth-and-neck portion 68, so that the shell 4 is raised with rotation. However, the tamper-evident hem 16 of the shell 4 is locked by the locking flap piece 48 formed on the inner peripheral surface 46 thereof to the lower surface of the annular locking jaw 72 formed on the mouth and neck 68. Therefore, 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 generated at 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-ruptured bridge portion 22. Also, considerable stress is generated in the axial breaking line 52 formed in the tamper-evident foot 16, and the axial breaking line 52 is also broken. Due to such a break, the tamper-evident hem portion 16 is developed from an endless annular shape to an end band shape, and the annular locking jaw portion 72 of the mouth and neck portion 68 is formed.
The locking of the locking flap piece 48 is released. Thereafter, the entire shell 4 including the tamper-evident foot 16 can be raised.

On the other hand, with respect to the liner member 6 of the container lid 2, the liner member 6 is in a non-adhesive state or a weakly adhered state to the shell 4, and the liner member 6 is moved by a relatively small force to the inner surface of the top wall 8 of the shell 4. And the liner member 6 is attracted to the mouth and neck 68 by the negative pressure generated in the container as described above. As shown in FIGS. 5 and 6, the liner member 6 is maintained close to the upper end of the mouth and neck 68 without being raised along with the shell 4, so that the seal of the mouth and neck 68 is maintained. Maintained without being damaged, the liner member 6 is lowered relative to the shell 4 and separated downward from the inner surface of the top wall 8. For a while after the circumferential breaking line 12 and the axial breaking line 52 are broken as described above, the liner member 6 is not raised along with the rising of the shell 4 and the upper end of the mouth-neck portion 68 is not raised. It is kept in close contact with the part. As the shell 4 continues to ascend, as shown in FIGS. 6 and 7, three protruding pieces 54 a, 54 b and 54 c formed on the inner peripheral surface 32 of the main part 14 of the skirt wall 10 of the shell 4. Sequentially interfere with the outer peripheral edge of the liner member 6, more specifically, the outer peripheral edge of the lower end of the outer ridge 56 (that is, the projecting piece 54a located at the uppermost position in the axial direction first interferes with the liner member 6). And then a projecting piece 5 located in the middle as viewed in the axial direction
4b interferes with the liner member 6, and then the lowermost projecting piece 54c seen in the axial direction interferes with the liner member 6), and the interference lowers the liner member 6 relative to the shell 4. Is prevented. Accordingly, the liner member 6 is attached to the shell 4 sequentially from a specific angle portion (a portion where the protruding piece 54a starts to interfere), and therefore, is slightly inclined with respect to the horizontal when the liner member 6 is viewed as a whole. It is raised from the part 68, and thus is separated from the mouth and neck part 68 sequentially from the specific angle part. When the liner member 6 is moved away from the 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 ventilation path defined by the interruption region 40 of the internal thread 38. I can communicate. As shown in FIG. 8, the shell 4 continues to move up, with the liner member 6 continuing to move up, and the entire container lid 2 is detached from the neck 68.

The reason why the liner member 6 is separated from the mouth and neck 68 and the sealing of the mouth and neck 68 is released is as follows.
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 and neck 68. This is after the locking of the locking flap piece 48 formed on the tamper-evident hem 16 with the annular locking 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 and neck 68 without causing breakage of the mouth, in other words, without leaving traces of the opening operation. When the mouth and neck 68 is opened, the circumferential break line 12 and the axial break line 52 are always broken prior to 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 When disengaged downward from the upper inner peripheral surface 30 of the main portion 14 of the wall 10, the inner surface of the mouth-neck portion 68, the inner surface of the top wall 8 of the shell 4 and the skirt wall 1
0, the restraining of the liner member 6 which has been compressed between the upper inner peripheral surface 30 of the main portion 14 and the lower outer peripheral surface of the outer ridge 56 of the liner member 6 is somewhat radially outward. It is swollen. Accordingly, as can be understood by referring to FIG. 6, the inner diameter D2 (FIG. 2) defined by the radially inner end of the internal thread 38 is equal to the skirt wall 10.
Inner diameter D1 of the upper inner peripheral surface 30 of the main part 14 in FIG.
Is substantially the same or slightly smaller than this, the upper end of the female thread 38 starts to interfere with the liner member 6 before the projecting 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, such interference prevents the liner member 6 from lowering relative to the shell 4, and as a result, a specific angular portion of the liner member 6 is locally opened. There is also a possibility that the seal of the mouth-neck portion 68 is released by being separated from the neck portion 68 (the position of the radially inner end of the female screw thread 38 depends on the position of the embossing tool 60 when the liner member 6 is formed). Due to insertion or the like, the upper inner peripheral surface 3 of the main portion 14 in the skirt wall 10
The possibility is relatively small, because it is limited to substantially the same as or outside of zero, and in order to reliably prevent the liner member 6 from lowering relative to the shell 4, the projecting piece 54 is required.
a, 54b and 54c need to be provided).
Accordingly, regarding the arrangement of the female thread 38, the female thread 38 is attached to the liner member 6 that is closely attached to the upper end of the mouth-neck portion 68 after the circumferential breaking line 12 and the axial breaking line 52 are broken. (In other words, the female thread 38 does not interfere with the liner member 6 before the circumferential breaking line 12 and the axial breaking line 52 are broken). Is preferred.

If it is desired to temporarily reseal the mouth and neck 68 after the entire container lid 2 has been detached from the mouth and neck 68 as described above, the shell 4 Non-rupture bridging part 22 in circumferential breaking line 12
After the tamper-evident hem portion 16 is detached by breaking the container lid 2, the container lid 2 is re-fitted to the mouth and neck portion 68 and the shell 4
May be screwed into the male thread 70 of the mouth and neck 68. Thus, the liner member 6, which is prevented from detaching from the shell 4 due to the presence of the protruding pieces 54 a 54 b and 54 c, is again brought into close contact with the upper end of the mouth-neck portion 68, whereby the mouth-neck portion 68 is temporarily temporarily sealed. You.

FIGS. 9 and 10 show a modified embodiment of the container lid constructed in accordance with the present invention. 9 and 1
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 the second thread 32 extends continuously, and the female thread 138 has no interruption region. The three protruding pieces (only one of them 154a is shown) protrude radially inward from the radially inner end of the female screw thread 138. If desired
Instead of arranging a plurality of projecting pieces projecting radially inward from the female thread 138 at appropriate intervals in the circumferential direction,
The projecting piece having a form extending continuously in the circumferential direction is formed into a female thread 138.
Can also be formed. Other configurations of the container lid 102 illustrated in FIGS. 9 and 10 are substantially the same as the container lid 2 described above.

In the above-described and modified embodiments, the tamper-evident skirt 16 of the shells 4 and 104 is used.
And 116 are formed with axial break lines 52 and 152, if desired.
And 152 may be omitted. In this case, when opening the mouth and neck of the container, the circumferential breaking lines 12 and 112 are broken throughout the circumferential direction, and the tamper-evident hem portions 16 and 116 are skirt walls 10 and 110.
And the tamper-evident skirts 16 and 116 remain there without being detached from the mouth and neck.

[0028]

According to the container lid of the present invention, the sealing of the mouth and neck of the container can be performed without breaking the circumferential breaking line (and the axial breaking line) of the container lid, and without leaving any traces. It is virtually impossible to destroy,
If the seal at the mouth and neck of the container is broken, the circumferential break line (and the axial break line) must be broken prior to this.

[Brief description of the drawings]

FIG. 1 is a cross-sectional and 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.

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

FIG. 3 is a developed view showing female threads and projecting pieces formed on a shell of the container lid of FIG. 1;

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

FIG. 5 is a partial cross-sectional view showing the behavior of the container lid in the first stage when opening the mouth and neck by rotating the container lid in the opening rotation direction from the state shown in 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 from the state shown in FIG. 4 to open the mouth and neck.

FIG. 7 is a partial cross-sectional view showing the behavior of the container lid in the third stage when the mouth and neck are opened by rotating the container lid in the opening rotation direction from the state shown in FIG. 4;

FIG. 8 is a partial cross-sectional view showing the behavior of the container lid at the fourth stage when the mouth and neck are opened by rotating the container lid in the opening rotation direction from the state shown in FIG.

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

FIG. 10 is a partial sectional view showing a part of the container lid of FIG. 9;

[Explanation of symbols]

 2: container lid 4: shell 6: liner member 8: top wall 10: skirt wall 12: circumferential breaking line 14: main part of the skirt wall 16: tamper-evident hem 28: annular shoulder surface 30: upper inner peripheral surface 38: female thread 40: interruption area 48: locking flap piece (locking means) 52: axial breaking line 54a: projecting piece 54b: projecting piece 54c: projecting piece 68: mouth and neck 70: male thread 72: Annular locking jaw 102: Container lid 112: Circumferential breaking line 104: Shell 110: Skirt wall 114: Main part of skirt wall 116: Tamper evidence bottom 138: Female thread 152: Axial breaking line 154a: Projection Piece

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B65D 41/34 B65D 41/04 B65D 53/04

Claims (6)

(57) [Claims] 1. A top surface wall and a cylindrical skirt wall hanging from a peripheral edge of the top surface wall, wherein the skirt wall is formed with a break line extending in a circumferential direction, and the skirt wall is provided on the peripheral surface of the skirt wall. The main portion above the direction breaking line and a tamper-evident hem portion below the circumferential breaking line, and a female thread is formed on the inner peripheral surface of the main portion. A tamper-evident tamper-evident, comprising: a synthetic resin shell having a locking means formed on an inner peripheral surface of a skirt portion; and a synthetic resin liner member disposed on an inner surface of the top wall of the shell. In the synthetic resin container lid having characteristics, the female screw thread is provided with interruption regions at a plurality of circumferentially spaced portions, and the inner peripheral surface of the main portion of the skirt wall is provided on the inner peripheral surface. Are circumferentially spaced and the interrupted area of the female thread A plurality of positioned flexible protrusions are disposed, each of the protrusions extending radially inward beyond a radially inner edge of the female thread. The shell and the liner member are in a non-adhered or weakly adhered 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 projecting piece. A synthetic resin container lid. 2. A top surface wall and a cylindrical skirt wall hanging from a peripheral edge of the top surface wall, wherein the skirt wall is formed with a break line extending in a circumferential direction, and the skirt wall is provided on the peripheral surface of the skirt wall. The main portion above the direction breaking line and a tamper-evident hem portion below the circumferential breaking line, and a female thread is formed on the inner peripheral surface of the main portion. A tamper-evident tamper-evident, comprising: a synthetic resin shell having a locking means formed on an inner peripheral surface of a skirt portion; and a synthetic resin liner member disposed on an inner surface of the top wall of the shell. In a synthetic resin container lid having characteristics, a flexible protruding piece extending radially inward from the female thread is provided, and the shell and the liner member are not adhered or weakly adhered. The liner member is in a state with a relatively small force. 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 a circumferential direction and shifted in an axial direction. 4. The composite as claimed in claim 1, wherein each of the projecting pieces is extended substantially horizontally or axially inwardly inward in the radial direction. Resin container lid. 5. A downwardly directed annular shoulder surface is formed at 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. An upper inner peripheral surface above the annular shoulder surface extends substantially vertically, and an inner diameter thereof is substantially the same as or smaller than an inner diameter of the internal thread, and the liner member is provided on the top wall of the shell. The synthetic resin material is supplied to the inner surface of the liner, and is formed 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. Container lid made of synthetic resin. 6. A container having a cylindrical mouth and neck portion, wherein a male thread and an annular locking jaw located below the male thread are provided on the outer peripheral surface of the mouth and neck. After the container is filled with the contents, the female screw is screwed into the male screw of the mouth and neck by being fitted to the mouth and neck and rotating in the closing direction. The locking means is locked to the locking annular jaw,
6. A method according to any of claims 1 to 5, wherein 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, after which a negative pressure is created in the container. Container lid made of synthetic resin.