JP2013180820A - Synthetic resin container lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a synthetic resin container lid including a circular top wall (4) and a cylindrical skirt wall (6) suspended from the circumferential edge of the top wall and having a circumferential breaking line (14) arranged in the skirt wall while extending in the circumferential direction, so that a rapid increase in torque when opening the mouth neck part is avoided and also a necessary secondary torque is reduced by fully and reliably avoiding the breakage of bridging portions (22) of the circumferential breaking line when mounting the container lid on the mouth neck part (34) of the container, thus enabling the bridging portions of the circumferential breaking line to be fully and easily broken.SOLUTION: A plurality of auxiliary slits (32) are formed adjacent to the bridging portions of a circumferential breaking line while extending downward or upward from the bridging portions.

Description

  The present invention comprises a synthetic resin container having a circular top wall and a cylindrical skirt wall depending from the periphery of the top wall, and a circumferential break line extending in the circumferential direction is provided on the skirt wall. Regarding the lid.

  As a container lid for a beverage container, a synthetic resin container lid having a circular top wall and a cylindrical skirt wall depending from the peripheral edge of the top wall is widely used, as disclosed in Patent Document 1 below. Has been. A circumferential rupture line extending in the circumferential direction is disposed on the skirt wall, and the skirt wall has a main portion above the circumferential rupture line and a tamper evidence hem below the circumferential rupture line. It is partitioned. The circumferential break line is composed of a plurality of slits extending in the circumferential direction at intervals in the circumferential direction and a plurality of bridging portions positioned between the slits. 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 evidence skirt.

  The container lid as described above is applied to a container having a generally cylindrical mouth-and-neck portion with an open upper surface. A male thread and a locking jaw located below the male thread are formed on the outer peripheral surface of the mouth and neck of the container, which can be formed of an appropriate synthetic resin such as polyethylene terephthalate, glass, or a metal thin plate. ing. When sealing the mouth and neck after filling the contents in the container, a container lid is fitted over the mouth and neck and rotated in the closing direction. Thus, the female thread of the container lid is screwed into the male thread of the mouth-and-neck part, and the container lid is lowered with respect to the mouth-and-neck part according to the rotation. The locking means formed on the tamper evidence skirt is elastically over the locking jaw of the mouth and neck and positioned below it. When consuming the contents of the container, the container lid is rotated in the opening direction. Thus, the container lid is raised along with the rotation by the cooperation of the male thread on the mouth and neck and the female thread on the container lid. However, the tamper evidence skirt is prevented from rising by the locking means formed on the inner peripheral surface of the tamper evident hem at the locking jaw of the mouth and neck. Stress is generated, the circumferential break line breaks, more specifically the plurality of bridging portions are broken, and the tamper evidence skirt is separated from the main portion of the skirt wall. Thereafter, except for the tamper evidence skirt, the container lid rises with rotation and is detached from the mouth and neck, and the mouth and neck are opened.

JP 2011-143942 A

  Thus, the conventional container lid of the above-described form includes a so-called necessary secondary torque for opening the mouth and neck of the container, that is, a circumferential break line disposed on the skirt wall, and more specifically, its bridge. There is a problem that the required torque for breaking the tangle is relatively large and the opening operation is not always easy. In order to solve such a problem, it is intended to reduce the breaking strength of the bridging portion at the circumferential breaking line, but if the breaking strength of the bridging portion is reduced, a container lid is attached to the mouth and neck of the container. Thus, there is a possibility that a part of the bridging portion is broken when the mouth and neck portion is sealed.

  The present invention has been made in view of the above-mentioned facts, and the main technical problem thereof is that the bridging portion in the circumferential break line is sufficiently broken when the container lid is attached to the mouth and neck of the container. Reliably avoiding, avoiding a sudden increase in torque when opening the mouth and neck, and reducing the required secondary torque, and thus can easily break the bridge in the circumferential break line, It is a novel and improved synthetic resin container lid.

  As a result of diligent research, the present inventor achieves the main technical problem by forming a plurality of auxiliary slits extending in the circumferential direction below or above the bridging portion in the circumferential fracture line. I found out that I can.

That is, according to the first aspect of the present invention, the synthetic resin container lid for achieving the main technical problem includes a circular top wall and a cylindrical skirt wall depending from the periphery of the top wall, and the skirt A circumferential break line extending in the circumferential direction is disposed on the wall, and the skirt wall has a main portion above the circumferential break line and a tamper evidence skirt below the circumferential break line. The circumferential break line is composed of a plurality of slits extending in the circumferential direction at intervals in the circumferential direction and a plurality of bridging portions positioned between the slits. In the synthetic resin container lid in which a female thread is disposed on the inner peripheral surface of the portion, and a locking means is disposed on the inner peripheral surface of the tamper evidence skirt,
A synthetic resin container lid, characterized in that a plurality of auxiliary slits extending in the circumferential direction below the bridging portion are arranged in the tamper evidence skirt near the bridging portion. Is provided.

According to the second aspect of the present invention, the synthetic resin container lid for achieving the main technical problem includes a circular top wall and a cylindrical skirt wall depending from the periphery of the top wall, and the skirt wall Is provided with a circumferential break line extending in the circumferential direction, and the skirt wall is formed between a main portion above the circumferential break line and a tamper evidence skirt below the circumferential break line. The circumferential break line is composed of a plurality of slits extending in the circumferential direction at intervals in the circumferential direction and a plurality of bridging portions positioned between the slits. In the synthetic resin container lid in which the female thread is disposed on the inner peripheral surface, and the locking means is disposed on the inner peripheral surface of the tamper evidence skirt,
The main portion is provided with a synthetic resin container lid characterized by being provided with a plurality of auxiliary slits extending in the circumferential direction above the bridge portion in the vicinity of the bridge portion. The

  The circumferential length of each of the auxiliary slits is shorter than the circumferential length of each of the slits, but is longer than the circumferential length of each of the bridging portions, and the circumferential center of each of the auxiliary slits and the bridge. It is preferable that the center of the entangled portion is aligned in the axial direction. The axial distance between the slit and the auxiliary slit is preferably equal to or greater than the circumferential length of the bridging portion.

  In the synthetic resin container lid of the present invention, since the auxiliary slit is disposed below or above the bridge portion, the skirt wall is elastically deformed below or above the bridge portion, Since the elastic deformation and the plastic deformation of the bridging portion are buffered by such elastic deformation, the bridging portion is sufficiently surely avoided when the container lid is attached to the mouth neck of the container. On the other hand, when opening the mouth and neck of the container by breaking the bridging portion, elastic deformation of the skirt wall due to the presence of the auxiliary slit and elastic deformation and plastic deformation of the bridging portion occur over time, The torque required to break the bridge is not increased instantaneously but dispersed over time, thus making it possible to break the bridge easily enough without requiring excessive secondary torque. it can. Furthermore, when the bridging portion is broken, the auxiliary slit is deformed, and thereby, the release of the sealing of the mouth and neck is more clearly displayed (so-called tamper evidence display becomes clearer).

The front view which shows a suitable embodiment of the container lid comprised according to this invention in part with sectional drawing. The partial expanded view which expand | deploys and shows the site | part by which the circumferential direction fracture | rupture line in the container lid of FIG. 1 is arrange | positioned. The front view which shows the initial state at the time of attaching a container lid of FIG. 1 to the mouth neck part of a container, and rotating a container cover in an opening direction and detaching | releasing from a mouth neck part. The front view which shows the state immediately after rotating a container lid further in the opening direction from the state shown in FIG. 3, and breaking the circumferential direction fracture line. The partial expanded view which expand | deploys and shows the site | part by which the circumferential direction fracture | rupture line is arrange | positioned in the modification of the container lid comprised according to this invention.

  Hereinafter, a preferred embodiment of a container lid constructed according to the present invention will be described in more detail with reference to the accompanying drawings.

  Referring to FIG. 1, a container lid, generally indicated by numeral 2, which can be integrally injected or compression molded from a suitable synthetic resin such as polyethylene or polypropylene, has a circular top wall 4 and the top wall 4. It has a cylindrical skirt wall 6 depending from the periphery. The inner surface of the top wall 4 is positioned between the inner seal piece 8 and the outer seal piece 10 when viewed in the radial direction together with the cylindrical inner seal piece 8 and the cylindrical outer seal piece 10 arranged concentrically. An annular ridge 12 is formed. The skirt wall 6 is provided with a circumferential break line 14 extending in the circumferential direction. The skirt wall 6 has a main portion 16 above the circumferential break line 14 and a tamper below the circumferential break line 14. It is partitioned into an evidence skirt 18. The circumferential break line 14 includes a plurality of slits 20 extending in the circumferential direction at intervals in the circumferential direction and a plurality of bridging portions 22 positioned between the slits 20. The slit 20 in the circumferential break line 14 can be formed, for example, by cutting the skirt wall 6 by applying an appropriate cutting edge (not shown) from the outer peripheral surface of the skirt wall 6. In the illustrated embodiment, all the slits 20 have the same circumferential length L1, and all the bridging portions 22 have the same circumferential length L2.

  An annular ridge 23 is formed at the lower end of the outer peripheral surface of the main portion 16 of the skirt wall 6. And in the area | region above the cyclic | annular protrusion 23 in the main part 16 of the skirt wall 6, the uneven | corrugated shape (namely, the convex part located alternately in the circumferential direction) for preventing the user's finger | toe | hook slipped on it And recesses) 24 are formed. A female thread 26 is formed on the inner peripheral surface of the main portion 16 of the skirt wall 6. On the other hand, a locking means 28 is disposed on the inner peripheral surface of the tamper evidence skirt 18. In the illustrated embodiment, the locking means 28 is composed of a plurality of locking pieces 30 arranged at intervals in the circumferential direction, and the vertical cross-sectional shape of each of the locking pieces 30 is a substantially right triangle. It has a shape, and has an upper surface that extends slightly inclining downward inward in the radial direction, an inner surface that is substantially arc-shaped, and a lower surface that inclines outward in the radial direction.

  In the container lid 2 configured according to the present invention, it is important that the auxiliary slit 32 is disposed in association with the circumferential break line 14. With reference to FIG. 2 together with FIG. 1, in the illustrated embodiment, at the upper end of the tamper evidence skirt 18, close to each of the bridging portions 22 of the circumferential break line 14 and below it. A plurality of auxiliary slits 32 (the same number as the bridging portions 22) extending in the circumferential direction are disposed. All the auxiliary slits 32 have the same circumferential length L3. Although the circumferential length L3 of the auxiliary slit 32 is shorter than the circumferential length L1 of the slit 20 in terms of buffering the elastic deformation and plastic deformation of the bridging portion 22 by the auxiliary slit 32, the circumferential direction of the bridging portion 22 It is preferably longer than the length L2 (L1> L3> L2), and the circumferential center of each auxiliary slit 32 and the circumferential center of the bridging portion 22 are preferably aligned in the axial direction. In addition, from the viewpoint of reliable breakage of the bridging portion 22, the axial distance G between the slit 20 and the auxiliary slit 32 is preferably equal to or greater than the circumferential length L2 of the bridging portion 22 (L2 ≦ G). .

  In FIG. 1, the mouth and neck portion of the container provided with the container lid 2 together with the container lid 2 is also shown by a two-dot chain line. A mouth and neck portion, generally designated by numeral 34, of a container that can be formed from an appropriate synthetic resin such as polyethylene terephthalate, glass, or a thin metal plate has a cylindrical shape as a whole, and an upper surface is opened. On the outer peripheral surface of the mouth-and-neck portion 34, a male thread 36, a locking jaw part 38 positioned below the male thread 36, and a support ring 40 positioned further below the locking jaw part 38 are formed. Yes. As is well known to those skilled in the art, the support ring 40 is utilized in transporting containers.

  When the container lid 2 is attached to the mouth-and-neck part 34 and the mouth-and-neck part 34 is sealed after filling the container with contents such as a soft drink, the container lid 2 is put on the mouth-and-neck part 34. The container lid 2 is rotated in the closing direction, that is, clockwise as viewed from above in FIG. Thus, the female thread 26 of the container lid 2 is screwed into the male thread 36 of the mouth-and-neck part 34, and the container lid 2 is relatively lowered with the rotation. When the container lid 2 is lowered to the required position, that is, the position shown in FIG. 1, the annular ridge 12 formed on the inner surface of the top wall 4 of the container lid 2 contacts the top surface of the mouth neck portion 34. In addition, the inner seal piece 8 and the outer seal piece 10 formed on the inner surface of the top wall 4 of the container lid 2 are brought into close contact with or in contact with the inner and outer peripheral surfaces of the mouth and neck portion 34, respectively. The neck 34 is sealed. The locking piece 30 formed on the inner peripheral surface of the tamper evidence skirt 18 elastically climbs over the locking jaw portion 38 of the mouth and neck portion 34 and is positioned below it. At this time, stress is generated in the bridging portion 22 of the circumferential break line 14, but due to the presence of the auxiliary slit 32, the skirt wall 6 in the vicinity of the circumferential break line 14, particularly its tamper evidence skirt. The upper end portion of 18 is appropriately deformed, whereby the stress acting on the bridging portion 22 is reduced. Thus, when the container lid 2 is attached to the mouth / neck portion 34, the circumferential break line 14 is sufficiently prevented from being broken.

  With continued description with reference to FIG. 1, when opening the mouth and neck 34 to consume the contents of the container, the container lid 2 is opened, that is, counterclockwise as viewed from above in FIG. Rotate to. In this way, the main portion 16 of the skirt wall 6 together with the top wall 4 of the container lid 2 is relatively raised with rotation by the cooperation of the female screw 26 and the male screw 36. On the other hand, the tamper evidence skirt 18 is prevented from rising because the locking piece 30 formed on the inner peripheral surface of the tamper evident skirt 18 is locked to the locking jaw 38 of the mouth and neck 34. Therefore, stress is generated in the bridging portion 22 of the circumferential break line 14 and the bridging portion 22 is broken. Thus, in the container lid 2 constructed according to the present invention, since the auxiliary slit 32 is formed in association with the circumferential break line 14, prior to the breakage of the bridging portion 22 as shown in FIG. In the vicinity of the bridging portion 22, more specifically, a portion between the slit 20 and the auxiliary slit 32 is elastically deformed or plastically deformed, and the slit 20 and the auxiliary slit 32 are expanded in the axial direction. Following such deformation, As shown in FIG. 4, the breakage of the bridging portion 22 proceeds. The breakage of the bridging portion 22 is not performed instantaneously, but is performed over time following the elastic deformation and plastic deformation in the vicinity of the bridging portion 22, and so-called required for breaking the bridging portion 22. The secondary torque is dispersed over time, and it is prevented as much as possible from suddenly and instantaneously becoming excessive. After the bridging portion 22 of the circumferential break line 14 is broken and the tamper evidence skirt portion 18 is separated from the main portion 16, the top wall 4 of the container lid 2 and the main portion 16 of the skirt wall 6 are rotated. The mouth and neck 34 can be lifted freely and removed from the mouth and neck 34, thus opening the mouth and neck 34.

  FIGS. 5A to 5D show modified examples of the auxiliary slit. In the modification shown in FIG. 5A, the auxiliary slits 32 are arranged only for every other bridging portion 22 instead of providing the auxiliary slits 32 in association with all the bridging portions 22. (Therefore, the number of auxiliary slits 32 is half the number of bridging portions). In the modification illustrated in FIG. 5B, the auxiliary slit 32 is provided in association with the two continuous bridging portions 22, but the bridging adjacent to the two continuous bridging portions 22. The auxiliary slits 32 are not provided for the portions 22 (therefore, the number of auxiliary slits 32 is 2/3 of the number of bridging portions 22). 5C, the circumferential lengths of the auxiliary slits 32 are not all the same, and the auxiliary slit 32a having a relatively long circumferential length and the auxiliary slit 32b having a relatively short circumferential length. Are alternately arranged. In the modification shown in FIGS. 5A to 5C, the breaking of the plurality of bridging portions 22 proceeds in a stepwise manner, not at the same time, and also from this point, it is necessary to break the bridging portion 22. Torque is reduced.

  Instead of providing an auxiliary slit 32 below the circumferential break line 14 and thus at the upper end of the tamper evidence skirt 18, if desired, above the circumferential break line 14 and thus the main of the skirt wall 6. An auxiliary slit 32 may be provided at the lower end of the portion 16. In the embodiment illustrated in FIG. 5 (d), a plurality of pieces extending in the circumferential direction above the lower end portion of the main portion 16 of the skirt wall 6, close to each of the bridging portions 22 of the circumferential break line 14. Auxiliary slits 32 (the same number as the bridging portions 22) are provided. As in the case of the embodiment illustrated in FIG. 2, all the auxiliary slits 32 have the same circumferential length L <b> 3, and the circumferential length L <b> 3 of the auxiliary slit 32 is larger than the circumferential length L <b> 1 of the slit 20. Although short but longer than the circumferential length L2 of the bridging portion 22 (L1> L3> L2), the circumferential center of each auxiliary slit 32 and the circumferential center of the bridging portion 22 are aligned in the axial direction. The circumferential length L2 of the bridging portion 22 is equal to or less than the axial distance G between the slit 20 and the auxiliary slit 32 (L2 ≦ G). Even when the auxiliary slits 32 are arranged above the circumferential break line instead of below, the auxiliary slits 32 are arranged for all the bridging portions 22 as illustrated in FIGS. 5A to 5C. Instead, the arrangement of the auxiliary slits 32 can be omitted as appropriate, or the circumferential length of the auxiliary slits 32 can be changed as appropriate. In addition, the circumferential lengths of the slit 20 and the bridging portion 22 in the circumferential break line 14 are also appropriately changed, and the circumferential length of the auxiliary slit 32 is appropriately changed according to this, or the bridging portion. It is also possible to appropriately displace the circumferential position of the auxiliary slit 22 with respect to 22.

  In the embodiment described above, when opening the mouth and neck of the container, all the bridging portions are broken and the tamper evidence hem is separated from the main part of the skirt wall, and the tamper evidence hem is formed in the mouth and neck. However, the present invention is not limited to such a container lid, and one or more bridging portions are maintained without breaking, The present invention is also applied to a form in which the axially weakening line disposed at the tamper evidence hem is broken and the tamper evidence hem is developed from an annular shape into a band shape, and the tamper evidence hem is also detached from the mouth and neck. Can be applied.

2: Container lid 4: Top wall 6: Skirt wall 14: Circumferential rupture line 16: Main part of skirt wall 18: Tamper evidence hem 20: Slit 22: Bridge 26: Female thread 28: Locking means 32: Auxiliary slit 34: Mouth neck 36: Male thread 38: Locking jaw

Claims (4)

A circular top wall and a cylindrical skirt wall depending from the peripheral edge of the top wall are provided, and a circumferential break line extending in the circumferential direction is provided on the skirt wall, and the skirt wall is broken in the circumferential direction. A plurality of slits extending in the circumferential direction at intervals in the circumferential direction, and are divided into a main portion above the line and a tamper evidence skirt below the circumferential breaking line. And a plurality of bridging portions located between the slits, female threads are provided on the inner peripheral surface of the main portion, and the inner peripheral surface of the tamper evidence hem portion is engaged with the inner peripheral surface. In the synthetic resin container lid in which the stopping means is arranged,
A synthetic resin container lid, characterized in that a plurality of auxiliary slits extending in the circumferential direction below the bridging portion are arranged in the tamper evidence skirt near the bridging portion. . A circular top wall and a cylindrical skirt wall depending from the peripheral edge of the top wall are provided, and a circumferential break line extending in the circumferential direction is provided on the skirt wall, and the skirt wall is broken in the circumferential direction. A plurality of slits extending in the circumferential direction at intervals in the circumferential direction. And a plurality of bridging portions located between the slits, female threads are provided on the inner peripheral surface of the main portion, and the inner peripheral surface of the tamper evidence hem portion is engaged with the inner peripheral surface. In the synthetic resin container lid in which the stopping means is arranged,
A synthetic resin container lid, wherein the main portion is provided with a plurality of auxiliary slits extending in the circumferential direction above the bridging portion in proximity to the bridging portion.   The circumferential length of each of the auxiliary slits is shorter than the circumferential length of each of the slits, but is longer than the circumferential length of each of the bridging portions, and the circumferential center of each of the auxiliary slits and the bridge. The synthetic resin container lid according to claim 1 or 2, which is aligned in the axial direction with the circumferential center of the entangled portion.   4. The synthetic resin according to claim 1, wherein the circumferential length of the bridging portion is equal to or greater than the circumferential length of the bridging portion in the axial direction between the slit and the auxiliary slit. Container lid.

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