JP5912247B2 - Plastic container lid - Google Patents

Description

  The present invention relates to a cylindrical skirt wall that hangs from the periphery of a circular top wall, and a break line extending in the circumferential direction is formed, and the break line relates to a synthetic resin container lid that includes a plurality of bridge portions. .

  As is well known, a combination of a container formed of glass, a synthetic resin or a metal thin plate and a container lid formed of a synthetic resin is widely used for beverages. The container has a cylindrical mouth-and-neck portion, and a male thread and a locking jaw portion positioned below the male thread are formed on the outer peripheral surface of the mouth-and-neck section. On the other hand, the container lid has a circular top wall and a cylindrical skirt wall depending from the periphery of the top wall. A rupture line extending in the circumferential direction is formed on the skirt wall, and the skirt wall is divided into a main part above the break line and a tamper evidence skirt below the break line. The break line includes a plurality of bridge portions arranged at intervals in the circumferential direction, and the tamper evidence skirt portion is connected to the main portion via the bridge portion. A female thread is formed on the inner peripheral surface of the main part of the skirt wall and is threadedly engaged with the male thread of the mouth and neck. The inner peripheral surface of the tamper evidence skirt of the skirt wall is formed on the inner peripheral surface of the mouth and neck. A locking means that is locked to the locking jaw is provided.

  After filling the container with the beverage, the container lid is fitted over the mouth and neck of the container, the container lid is rotated in the closing direction, and the female thread of the container lid is screwed into the male thread of the mouth and neck. Attach a container lid to the neck and seal the mouth and neck. The locking means disposed on the skirt wall tamper-evidence skirt elastically rides over the locking jaw of the mouth and neck and is positioned below the locking jaw. When the mouth and neck are opened and the beverage is consumed, the container lid is rotated in the opening direction. In this way, the container lid is raised with respect to the mouth-and-neck portion according to the release of the screwing between the female screw and the male screw. When the container lid is lifted somewhat, the locking means arranged at the skirt wall tamper-evidence skirt is locked to the bottom of the mouth-neck locking jaw, thereby tamper-evident. The skirt is prevented from rising. If the container lid continues to rotate in the opening direction, the bridging part is broken by the stress generated at the bridging part in the breaking line formed on the skirt wall, and the tamper evident skirt part of the skirt wall starts from the main part. To be separated. When the container lid continues to rotate in the opening rotation direction, the tamper evidence skirt remains, the container lid is detached from the mouth and neck, and the mouth and neck are opened.

  In the container lid as described above, when a plurality of bridge portions existing in the break line can be broken at the same time, the torque required for breaking the bridge portion becomes excessive. And for children, the breakage of the bridging portion is extremely difficult, and therefore the opening of the mouth and neck tends to be extremely difficult. Therefore, in Patent Document 1 below, the cross-sectional areas of a plurality of bridging portions are appropriately changed so that the plural bridging portions are not simultaneously at the same time but are sequentially broken from those having a small cross-sectional area. It has been proposed that

JP-A-7-300147

  According to the experiences of the present inventors, in the container lid of the form disclosed in Patent Document 1, the main part of the container lid is the mouth and neck without breaking one or several bridging portions. The main part of the container lid continues to be connected to the tamper evidence hem that remains in the mouth and neck through one or several bridging parts (generally “hanging state” or “ghost” Tend to occur).

  The present invention has been made in view of the above-mentioned facts, and the main technical problem thereof is that when opening the mouth and neck of the container, all the bridging portions are not substantially the same, and the time interval is appropriately set. As much as possible, one or several bridges remain without being broken, even though an excessive torque is not required to break the bridge. It is to provide a new and improved synthetic resin container lid that is avoided.

As a result of intensive studies, the present inventors, in the container lid of the form disclosed in the above-mentioned Patent Document 1, in other words, due to the fact that the breaking of the plurality of bridging portions is not performed uniformly in the circumferential direction, in other words Recognized that there is a tendency for one or several bridges to remain without breaking due to non-uniform breakage of a plurality of bridges in the circumferential direction. . And based on such recognition, a plurality of bridging portions are broken at appropriate time intervals, but the breaking of the bridging portions is performed uniformly in the circumferential direction. Wisdom that he can achieve the objectives. A plurality of bridging portions are broken at appropriate time intervals, but in order to ensure that the bridging portions are uniformly broken in the circumferential direction, alternately in the circumferential direction on the breaking line. A plurality of connecting regions and non-connecting regions are provided, and in the non-connecting region, the main part and the tamper evidence skirt are completely separated, and in the connecting region, two pieces located at both ends in the circumferential direction of the connecting region. The tamper evident hem is connected to the main part by at least one intermediate bridge located between the end bridge and the end bridge, and the end bridge and the intermediate bridge in each of the connection regions the positional states of parts in addition to be Rukoto the same, larger than the same or which the circumferential length of the circumferential length of the non-connection region connection region, or the cross-sectional area of the end bridging portion in the connecting region Make it smaller than the cross-sectional area of the intermediate bridge It was found to be important.

That is, according to the first aspect of the 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 break line extending in the circumferential direction is formed in the wall, and the skirt wall is partitioned into a main portion above the break line and a tamper evidence skirt below the break line, and an inner circumference of the main portion In the synthetic resin container lid in which a female thread is formed on the surface, and a locking means is provided on the inner peripheral surface of the tamper evidence skirt,
In the fracture line, a plurality of connection regions and non-connection regions are alternately arranged in the circumferential direction, the circumferential lengths of the connection regions are all the same, and the circumferential lengths of the non-connection regions are all the same. It is the same, the circumferential length of the non-connection region circumferential length the same as or greater than this of the connection area, in the non-connection region and the main portion and the tamper evident bottom portion is completely isolated And the tamper-evidence skirt portion is formed by two end bridge portions located at both ends in the circumferential direction of the connection region and at least one intermediate bridge portion located between the end bridge portions in the connection region. Are connected to the main part, and the arrangement state of the end bridge part and the intermediate bridge part in each of the connection regions is the same,
A synthetic resin container lid is provided.
Further, according to the second aspect of the present invention, the synthetic resin container lid for achieving the main technical problem comprises a circular top wall and a cylindrical skirt wall depending from the periphery of the top wall, A rupture line extending in the circumferential direction is formed in the skirt wall, and the skirt wall is divided into a main portion above the break line and a tamper evidence skirt below the break line. In a synthetic resin container lid in which a female thread is formed on the peripheral surface, and a locking means is disposed on the inner peripheral surface of the tamper evidence skirt,
In the fracture line, a plurality of connection regions and non-connection regions are alternately arranged in the circumferential direction, the circumferential lengths of the connection regions are all the same, and the circumferential lengths of the non-connection regions are all the same. Two end bridges that are the same and are completely separated from each other in the non-connection region, and the tamper evidence skirt is located at both ends in the circumferential direction of the connection region. And at least one intermediate bridge located between the end bridges, the tamper evidence skirt is connected to the main part, and the end bridges and the intermediates in each of the connection regions The arrangement state of the bridge part is the same, the cross-sectional area of the end bridge part is smaller than the cross-sectional area of the intermediate bridge part,
Plastic container closure, characterized in that the Ru is provided.

  Preferably, 3 to 6 of each of the connection area and the non-connection area are arranged. In the connection region, it is preferable that a plurality of intermediate bridge portions are disposed between the end bridge portions. In a preferred embodiment, the cross-sectional areas of the end bridge part and the intermediate bridge part are the same, the circumferential distance between the end bridge part and the adjacent intermediate bridge part, and two adjacent two All the intervals in the circumferential direction of the intermediate bridge portion are the same.

  In the synthetic resin container lid of the present invention, when opening the mouth and neck of the container, the end bridge portion in each of the connection regions is broken, and then the intermediate bridge portion in the connection region is broken, The breakage of the tangles is performed uniformly in the circumferential direction, and the breakage of the intermediate bridges is also performed uniformly in the circumferential direction, so that all the bridging portions are not substantially simultaneous but at appropriate time intervals. It is possible to avoid as much as possible that one or several bridges remain unbroken despite being broken and therefore not requiring excessive torque to break the bridge. Is done.

The front view which shows a suitable embodiment of the synthetic resin container lid comprised according to this invention in part in a cross section. Sectional drawing in line III-III of FIG. The front view which shows the state which mounted | wore the mouth neck part of the container with the container lid of FIG. The front view in the state which rotated the container lid somewhat in the opening rotation direction from the state shown in FIG. The front view in the state which rotated the container lid further somewhat in the opening rotation direction from the state shown in FIG.

  Hereinafter, a preferred embodiment of a synthetic resin 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 2 that can be injection-molded or compression-molded from a suitable synthetic resin such as polyethylene or polypropylene includes a circular top wall 4 and a cylindrical skirt depending from the periphery of the top wall 4. Wall 6. A cylindrical inner seal piece 8 that hangs downward and a cylindrical outer seal piece 10 that also hangs downward are formed on the inner peripheral edge of the top wall 4. Further, a relatively small annular protrusion 9 is formed between the inner seal piece 8 and the outer seal piece 10.

  The skirt wall 6 has a relatively thick thick upper portion 12 and a relatively thin thin thin portion 14. A rupture line 16 extending in the circumferential direction is formed at the upper end of the thin lower portion 14, and the skirt wall 6 is divided into a main portion 18 above the rupture line 16 and a tamper evidence skirt 20 below the rupture line 16. Has been. The breaking line 16 will be described in detail later.

  On the outer peripheral surface of the main portion 18 of the skirt wall 2, anti-slip knurls 22 are formed which are formed of uneven shapes alternately present when viewed in the circumferential direction. Three female threads 24 are formed on the inner peripheral surface of the main portion 18 of the skirt wall 6. The three female threads 24 are arranged at an angular interval of 120 degrees, and each of the three female threads 24 is extended over an angular range of approximately 160 degrees. Locking means 26 is disposed on the inner peripheral surface of the tamper evidence skirt 20. In the illustrated embodiment, the locking means 26 is formed of five protrusions 28 that are spaced apart in the circumferential direction and extend in the circumferential direction. The longitudinal cross-sectional shape of each main portion (portion excluding both end portions) of the protrusion 28 is a substantially right triangle shape, and extends substantially horizontally inward in the radial direction or downward inward in the radial direction. Having an upper surface.

  On the inner peripheral surface of the tamper evidence skirt 20, a large-diameter upper portion 30 and a small-diameter lower portion 32 are disposed above the locking means 26. The large-diameter upper portion 30 has an inner diameter d1, the small-diameter lower portion 32 has an inner diameter d2, and the inner diameter d2 is smaller than the inner diameter d1 (d2 <d1). Between the large-diameter upper portion 30 and the small-diameter lower portion 32, there is a boundary portion 34 having an inverted truncated cone shape in which the inner diameter gradually decreases downward.

With reference to FIG. 2 together with FIG. 1, in the container lid 2 configured according to the present invention, a plurality of the fracture lines 16 are arranged alternately in the circumferential direction, preferably 3 to 6, It is important that the connection area 36 and the non-connection area 38 are included. In the illustrated embodiment, three connection regions 36 and three non-connection regions 38 are alternately arranged in the circumferential direction. The three connection regions 36 have the same circumferential length, and the three non-connection regions 38 have the same circumferential length. The breaking line 16 can be conveniently arranged by forming a slit (cut groove) extending in the circumferential direction by applying a cutting blade to the large-diameter upper portion 30 of the thin lower portion 14 of the skirt wall 6. In 38, the slit 40 is continuously extended over the whole circumferential direction, and the main part 18 and the tamper evidence skirt part 20 are completely separated. On the other hand, in the connection region 36, three slits 42 extending in the circumferential direction are formed at intervals in the circumferential direction. End bridge portions 44 exist at both ends in the circumferential direction of the connection region 36, and two intermediate bridge portions 46 exist between the end bridge portions 44 . In the illustrated embodiment, the cross-sectional area of the end bridge portion 44 and the cross-sectional area of the intermediate bridge portion 46 are all the same, but preferably the cross-section of the end bridge portion 44 is greater than the cross-sectional area of the intermediate bridge portion 46. The area is small . The circumferential interval between the end bridge portion 44 and the adjacent intermediate bridge portion 46 and the circumferential interval between the two adjacent intermediate bridge portions 46 are not necessarily required, but it is convenient that they are all the same. . If desired, only one intermediate bridge 46 (and thus two slits 42) or three or more (and thus four or more slits 42) can be provided. It is important that the arrangement state of the end bridge portion 44 and the intermediate bridge portion 46 in each of the connection regions 36 is substantially the same. As will be described later, in order to break the end bridge portion 44 prior to the breakage of the intermediate bridge portion 46, the circumferential length of the slit 40 is larger than the circumferential length of the slit 42, and also the non-connection region 38. The circumferential length is preferably equal to or greater than the circumferential length of the connection region 36.

  FIG. 3 also shows the container neck 48 of the container together with the container lid 2. The mouth and neck portion 48 of the container which can be formed from an appropriate synthetic resin such as polyethylene terephthalate, glass or metal thin plate has a cylindrical shape as a whole, and three male threads on the outer peripheral surface of the mouth and neck portion 48. 50 and a locking jaw 52 located below the male thread 50 are formed. The three male threads 50 are formed to correspond to the three female threads 24 in the container lid 2, and are arranged at an angular interval of 120 degrees and extend over an angular range of approximately 160 degrees. It is present. The locking jaw 52 has a truncated cone-shaped upper surface 54 whose outer diameter gradually increases downward, a cylindrical outer peripheral surface 56 and a lower surface 58 extending substantially horizontally. Further provided on the outer peripheral surface of the mouth-and-neck portion 48 is a support ring 60 positioned below the locking jaw 52 (the support ring 60 is used for transporting containers as is well known to those skilled in the art). ing.

  When the container lid 2 is attached to the mouth / neck part 48 after the contents are filled in the container and the mouth / neck part 48 is sealed, the container lid 2 is fitted on the mouth / neck part 48 and the container lid 2 is closed. 3, the female thread 24 of the container lid 2 is screwed to the male thread 50 of the mouth-and-neck part 48. When the female thread 24 is screwed onto the male thread 50 until the state shown in FIG. 3, the inner seal piece 8 of the container lid 2 enters the mouth neck 48 and is brought into close contact with the inner peripheral surface of the mouth neck 48. The annular ridge 9 is brought into intimate contact with the top surface of the mouth-and-neck portion 48, and the outer seal piece 10 is brought into intimate or close proximity to the outer peripheral surface of the mouth-and-neck portion 48, thus sealing the mouth-and-neck portion 48. The locking means 26 disposed on the inner peripheral surface of the tamper evidence skirt 20 elastically moves the locking jaw 52 of the mouth / neck 48 (that is, by elastic deformation or displacement of the tamper evidence skirt 20). It gets over and is located below the locking jaw 52.

  The description will be continued with reference to FIG. 3. In the state where the container lid 2 is attached to the mouth / neck portion 48 as required, that is, as shown in FIG. 3, the tamper evidence skirt 20 has a large inner peripheral surface. The upper diameter portion 30 is located opposite to the outer peripheral surface 56 of the locking jaw 52 in the mouth-and-neck portion 48. The inner diameter d1 of the large-diameter upper portion 30 is conveniently d1 ≧ D, preferably about 0 mm ≦ (d1−D) ≦ 0.4 mm, with respect to the outer diameter D of the locking jaw portion 52. It is desirable that the screw is loosely engaged with the locking jaw 52, that is, is substantially separated (including a simple contact state) or relatively weakly engaged without being brought into close contact.

  When opening the mouth-and-neck portion 48 to consume the contents, the container lid 2 is rotated in the opening direction, that is, counterclockwise as viewed from above in FIG. At the initial stage of such rotation, the large initial diameter upper portion 30 on the inner peripheral surface of the tamper evidence skirt 20 is loosely or weakly engaged with the locking jaw 52 of the mouth / neck 48, so that the necessary initial torque is excessive. Never become. When the container lid 2 is slightly rotated in the opening rotation direction and the container lid 2 is somewhat raised with respect to the mouth-and-neck portion 48, the latch disposed on the inner peripheral surface of the tamper evidence skirt 20. The upper end surface of the projection 28 constituting the means 26 contacts the lower surface 58 of the locking jaw 52 of the mouth / neck portion 48, and the small-diameter lower portion 32 on the inner peripheral surface of the tamper evidence skirt portion 20 is associated with the mouth / neck portion 48. It is located opposite to the outer peripheral surface 56 of the stop jaw 52. The inner diameter d2 of the small-diameter lower portion 32 with respect to the outer diameter D of the locking jaw 52 is d2 ≦ D, preferably 0 mm <(D−d2) ≦ 0.5 mm, and the outer peripheral surface 56 of the locking jaw 52 is On the other hand, the small diameter lower portion 32 is in an interference fit state.

  When the container lid 2 is further rotated in the opening direction from the state shown in FIG. 3, the tamper evidence skirt 20 is also moved upward through the end bridge 44 and the intermediate bridge 46 in the connection region 36 in the breaking line 16. To be forced into. However, there is no bridging portion in the non-connection region 38 and the tamper evidence skirt 20 is not substantially forced upward. Therefore, as shown in FIG. 4, in the non-connection region 38, the tamper evidence skirt portion 20 is deformed in an arc shape as a whole by displacing both sides in the circumferential direction above the center portion. When the container lid 2 is further rotated in the opening direction due to such deformation, the end bridge portion 44 of the connection region 36 is broken before the intermediate bridge portion 46 is broken as shown in FIG. Is done. When the container lid 2 is further rotated in the opening direction from the state illustrated in FIG. 5, the intermediate bridging portion 46 in the connection region 36 is also broken, and thus the tamper evidence skirt portion 20 is separated from the main portion 18.

  In the container lid 2 configured according to the present invention, not all the bridging portions are broken at the same time, but the end bridging portion 44 is broken first, and then the intermediate bridging portion 46 is spaced at a time interval. Is broken. Therefore, excessive torque is not required to break the bridge portion. In addition, since the breakage of the end bridge portion 44 and the breakage of the intermediate bridge portion 46 are performed uniformly in the circumferential direction, one or several of the end bridge portion 44 and the intermediate bridge portion 46 are broken. It is avoided as much as possible that it does not remain.

  After the breaking line 16 is broken all over and the tamper evidence skirt 20 is separated from the main portion 18 of the skirt wall 6, the container lid 2 is rotated in response to the rotation of the container lid 2 in the opening direction. The portion other than the tamper evidence skirt 20 is raised, the tamper evidence skirt 20 remains in the mouth neck 48, the container lid 2 is detached from the mouth neck 48, and thus the mouth neck 48 is opened. .

2: Container lid 4: Top wall 6: Skirt wall 16: Break line 18: Main part of skirt wall 20: Tamper evidence hem 28: Female thread 30: Locking means 36: Connection area 38: Non-connection area 44 : End bridge part 46: Intermediate bridge part 48: Mouth neck part 50: Male thread 52: Locking jaw part

Claims (6)

A circular skirt wall and a cylindrical skirt wall depending from the periphery of the top wall, and a rupture line extending in the circumferential direction is formed in the skirt wall, and the skirt wall is a main portion above the rupture line. And a tamper evidence bottom part below the breaking line, a female thread is formed on the inner peripheral surface of the main part, and a locking means is arranged on the inner peripheral surface of the tamper evidence bottom part. In the synthetic resin container lid,
In the fracture line, a plurality of connection regions and non-connection regions are alternately arranged in the circumferential direction, the circumferential lengths of the connection regions are all the same, and the circumferential lengths of the non-connection regions are all the same. It is the same, the circumferential length of the non-connection region circumferential length the same as or greater than this of the connection area, in the non-connection region and the main portion and the tamper evident bottom portion is completely isolated And the tamper-evidence skirt portion is formed by two end bridge portions located at both ends in the circumferential direction of the connection region and at least one intermediate bridge portion located between the end bridge portions in the connection region. Are connected to the main part, and the arrangement state of the end bridge part and the intermediate bridge part in each of the connection regions is the same,
A synthetic resin container lid. The synthetic resin container lid according to claim 1 , wherein a cross-sectional area of the end bridge portion is smaller than a cross-sectional area of the intermediate bridge portion . A circular skirt wall and a cylindrical skirt wall depending from the periphery of the top wall, and a rupture line extending in the circumferential direction is formed in the skirt wall, and the skirt wall is a main portion above the rupture line. And a tamper evidence bottom part below the breaking line, a female thread is formed on the inner peripheral surface of the main part, and a locking means is arranged on the inner peripheral surface of the tamper evidence bottom part. In the synthetic resin container lid,
In the fracture line, a plurality of connection regions and non-connection regions are alternately arranged in the circumferential direction, the circumferential lengths of the connection regions are all the same, and the circumferential lengths of the non-connection regions are all the same. Two end bridges that are the same and are completely separated from each other in the non-connection region, and the tamper evidence skirt is located at both ends in the circumferential direction of the connection region. And at least one intermediate bridge located between the end bridges, the tamper evidence skirt is connected to the main part, and the end bridges and the intermediates in each of the connection regions The arrangement state of the bridge part is the same, the cross-sectional area of the end bridge part is smaller than the cross-sectional area of the intermediate bridge part,
A synthetic resin container lid. The synthetic resin container lid according to any one of claims 1 to 3 , wherein three to six of each of the connection region and the non-connection region are arranged. The synthetic resin container lid according to any one of claims 1 to 4 , wherein a plurality of intermediate bridging portions are disposed between the end bridging portions in the connection region. All the circumferential spacing of the circumferential spacing and the two adjacent intermediate bridging portion of the intermediate bridging portion adjacent thereto and said end bridging portion are the same, the synthetic resin container according to claim 5, wherein lid.

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