JP6373099B2 - Synthetic resin container lid and combination of container lid and container - Google Patents

Description

  In the present invention, a circumferential rupture line composed of slits extending in the circumferential direction at intervals in the circumferential direction and bridging portions existing between the slits is formed on the skirt wall. A synthetic resin container lid in which a locking means is disposed on the inner peripheral surface of the tamper evidence hem below the line, and such a synthetic resin container lid and the outer peripheral surface of the mouth and neck Relates to a combination with a container in which a locking jaw is formed.

  As is well known, a combination of a container formed of glass, a synthetic resin or a thin metal plate and a synthetic resin container lid is widely used for beverage packaging. The container has a cylindrical mouth and neck, and a male thread and a locking jaw located below the male thread are formed on the outer peripheral surface of the mouth and neck. Typical examples of the synthetic resin container lid include container lids disclosed in Patent Documents 1 and 2 below. Such a container lid has a circular top wall and a cylindrical skirt wall depending from the periphery of the top wall. The skirt wall is formed with a circumferential break line composed of slits extending in the circumferential direction at intervals in the circumferential direction and bridging portions existing between the slits, and the skirt wall is broken in the circumferential direction. It is partitioned into a main portion above the line and a tamper evidence skirt below the circumferential break line. 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 evidence skirt.

  When sealing the mouth and neck of the container, the container lid is fitted on the mouth and neck and rotated in the closing rotation direction, and the female thread of the container lid is screwed onto the male thread of the mouth and neck. Thus, when the container lid is attached to the mouth and neck as required, the container lid locking means elastically rides over the locking jaw of the mouth and neck and is positioned below it. When opening the mouth and neck and consuming the contents of the container, 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 in response to the screw release of the male screw and the female screw. When the container lid is raised somewhat, the locking means of the container lid is locked to the locking jaw of the mouth and neck, thereby preventing the tamper evidence skirt from rising. If the container lid continues to rotate in the opening direction, the circumferential break line formed in the skirt wall is broken, and the tamper evidence hem of the skirt wall is separated from the main part (or the tamper evidence hem When the axial break line is formed, the axial break line is broken and the tamper evident hem is developed from the endless ring to the end strip, and the tamper evidence hem is completely removed from the main part. It continues to be connected to the main part in a part of the circumferential direction without being separated). As the container lid continues to rotate in the opening direction, the tamper evidence hem remains, the container lid is removed from the mouth neck (or the entire container lid including the tamper evidence hem), and the mouth neck is Opened.

Japanese Utility Model No. 5-13735 JP 2013-126881 A

  Thus, the locking means formed on the inner peripheral surface of the tamper evidence skirt of the container lid is a plurality of locking protrusions extending in the circumferential direction at intervals in the circumferential direction or continuous in the circumferential direction. The locking protrusion or the protruding amount of the locking protrusion in the radial direction avoids excessive so-called unreasonable removal when the mold is detached from the mold. Therefore, and also in order to reliably avoid breaking of the circumferential break line when the container lid is attached to the mouth and neck, it is limited to a relatively small value. Therefore, when opening the mouth and neck, the engagement of the locking means with the locking jaw becomes insufficient, and the locking means elastically crosses the locking jaw without breaking the breaking line. There is a tendency for so-called slipping out. In order to prevent such slipping off, in the disclosure of Patent Document 1, the inner diameter of the region above the locking means in the tamper evidence skirt is made larger than the outer diameter of the locking jaw of the mouth and neck. Set a little smaller and close the inner peripheral surface of the tamper evidence hem to the outer peripheral surface of the locking jaw above the locking means, thereby suppressing the elastic deformation or displacement of the tamper evidence hem. ing. In the disclosure of Patent Document 2 above, the region above the locking means in the tamper evidence skirt is formed into an inverted conical shape whose inner diameter gradually increases downward, and a container lid is attached to the mouth and neck as required. In this state, the inner peripheral surface of the tamper evidence hem is substantially in contact with the outer peripheral surface of the locking jaw of the mouth and neck, but the container lid is rotated by rotating the container lid in the opening direction. When raised somewhat, the inner peripheral surface of the tamper evident hem is brought into close contact with the outer peripheral surface of the locking jaw of the mouth and neck so that the elastic deformation or displacement of the tamper evidence hem is suppressed. ing.

  On the other hand, when the contents are filled in the container, some contents often adhere to the outer peripheral surface of the mouth and neck. Therefore, before attaching the container lid to the mouth / neck part of the container, the cleaning liquid, which may be clean water, is sprayed onto the outer peripheral surface of the mouth / neck part to clean the contents attached to the outer peripheral surface of the mouth / neck part. Yes. In addition, after attaching the container lid to the mouth and neck as required, a cleaning liquid that may be clean water is sprayed on the outer peripheral surface of the container lid, and a dry gas that may be air is also applied to the container lid following the spraying of the cleaning liquid. Spray to remove wash water. However, according to the experience of the present inventors, when the inner peripheral surface of the tamper evidence hem portion is in close contact with or in contact with the outer peripheral surface of the locking jaw portion of the mouth and neck portion, the contact of the cleaning liquid is caused by such close contact. The downward flow is hindered, and the cleaning liquid remaining on the outer peripheral surface of the mouth-and-neck portion after jetting of dry gas flows out from the slit of the circumferential break line and adheres to the outer peripheral surface of the tamper-evident hem portion and remains. There is a tendency to end up. The outer surface of the tamper evidence hem is generally printed with an expiration date by an inkjet printer, but if the cleaning liquid adheres and remains on such part, printing such as the expiration date is hindered. End up.

  The present invention has been made in view of the above-mentioned facts, and its main technical problem is that when opening the mouth and neck of the container, it is located above the locking means on the inner peripheral surface of the tamper evidence hem. Although the region can be brought into close contact with the outer peripheral surface of the locking jaw portion of the mouth and neck portion, the elastic deformation or displacement of the tamper evidence skirt portion can be sufficiently suppressed, but it acts on the outer peripheral surface of the mouth and neck portion. Provided is a new and improved synthetic resin container lid which allows the flow of the washed washing liquid to be allowed, and therefore avoids and reliably prevents the washing liquid from adhering to and remaining on the outer peripheral surface of the tamper evidence hem, Another object is to provide a combination of the synthetic resin container lid and the container.

  As a result of diligent research and experiments, the present inventors have arranged a plurality of grooves extending in the central axis direction at intervals in the circumferential direction in a region above the locking means on the inner peripheral surface of the tamper evidence skirt. The main technical problem is achieved by defining a drainage path that allows the flow of liquid between the inner peripheral surface of the tamper evidence skirt and the locking jaw of the mouth and neck by such a groove. Found that you can.

That is, according to one 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 formed with a circumferentially extending fracture line composed of a plurality of slits extending in the circumferential direction at intervals and a plurality of bridging portions existing between the slits. Is divided into a main part above the break line and a tamper evidence skirt part below the break line, and an internal thread is formed on the inner peripheral surface of the main part, and the tamper evidence skirt part is formed. In the synthetic resin container lid in which the locking means is disposed on the inner peripheral surface of the part,
A plurality of grooves extending in the central axis direction are arranged at intervals in the circumferential direction in the region above the locking means on the inner peripheral surface of the tamper evidence skirt to allow liquid flow. There is provided a synthetic resin container lid characterized in that the lower end of the groove is spaced upward from the upper end of the locking means .

According to another aspect of the present invention, the combination of the synthetic resin container lid and the container that achieves the main technical problem has a cylindrical mouth and neck portion, and the outer peripheral surface of the mouth and neck portion is male. A container in which a locking jaw part located below the thread and the male thread is formed;
A circular top wall and a cylindrical skirt wall depending from the periphery of the top wall, and a plurality of slits extending in the circumferential direction at intervals in the circumferential direction and a plurality of slits existing between the slits. A rupture line extending in the circumferential direction is formed, and the skirt wall is partitioned into a main portion above the rupture line and a tamper evidence hem below the rupture line. A female thread that is screwed onto the male thread of the container is formed on the inner peripheral surface of the main portion, and a locking means is disposed on the inner peripheral surface of the tamper evidence skirt. A synthetic resin container lid,
The container lid is fitted on the mouth and neck of the container and rotated in the closing direction, and the female thread is screwed onto the male thread and the container lid is required on the mouth and neck of the container. When mounted in the manner described above, the locking means of the container lid elastically climbs over the locking jaw of the mouth-neck and is positioned below it, and the inner peripheral surface of the tamper evidence hem of the container lid In the combination in which the region above the locking means in the above is close to or in contact with the locking jaw of the mouth and neck,
A plurality of grooves are provided at intervals in the circumferential direction in the region above the locking means on the inner peripheral surface of the tamper evidence skirt , and the lower end of the groove is the bottom of the locking means. A plurality of drainage passages that allow fluid flow are defined between the locking jaw portion of the mouth-neck portion and the inner peripheral surface of the tamper-evident hem portion. A combination is provided that is characterized by

The locking means is composed of a plurality of locking projections arranged in the circumferential direction and extending in the circumferential direction, and the groove is arranged between adjacent locking projections. Is preferred .

  In the synthetic resin container lid of the present invention and the combination of the synthetic resin container lid and the container, a center is provided in the region above the locking means on the inner peripheral surface of the tamper evidence hem with a circumferential interval. A plurality of grooves extending in the axial direction are provided, and a drainage path that allows the flow of liquid between the inner peripheral surface of the tamper evidence skirt and the locking jaw of the mouth and neck by the grooves. It is prescribed. Therefore, the cleaning liquid applied to the outer peripheral surface of the mouth and neck is allowed to flow down, and it is sufficiently reliably avoided that the cleaning liquid adheres to and remains on the outer peripheral surface of the tamper evidence skirt. Since the grooves are arranged at intervals in the circumferential direction, the region above the locking means on the inner peripheral surface of the tamper evidence skirt is brought into close contact with the outer peripheral surface of the locking jaw portion of the mouth and neck. The action of sufficiently suppressing the elastic deformation or displacement of the tamper evidence skirt is not hindered.

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. The bottom view of the container lid shown in FIG. The expanded partial sectional view which shows the groove | channel in the container lid 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 relatively long cylindrical inner seal piece 8 that hangs downward and a relatively short cylindrical outer seal piece 10 that hangs downward are formed on the outer peripheral edge of the inner surface of the top wall 4. Further, a relatively small annular protrusion 12 is formed between the inner seal piece 8 and the outer seal piece 10.

  A rupture line 18 extending in the circumferential direction is formed on the skirt wall 6, and the skirt wall 6 is partitioned into a main portion 20 above the break line 18 and a tamper evidence skirt 22 below the break line 18. . In the illustrated embodiment, the breaking line 18 includes a plurality of circumferentially extending slits (cut grooves) 24 and a plurality of bridging portions 26 that remain between the slits 24. The dent skirt 22 is connected to the main portion 20 via a plurality of bridging portions 26.

  On the outer peripheral surface of the main portion 20 of the skirt wall 6, anti-skid knurls 28 are formed which are formed of uneven shapes alternately present in the circumferential direction. A female thread 30 is formed on the inner peripheral surface of the main portion 20 of the skirt wall 6, and a plurality of notches 32 are formed in the female thread 30 at intervals in the circumferential direction. And in the site | part in which the notch 32 is formed, the thin part 33 extended in a center axis line direction (up-down direction in FIG. 1) is arrange | positioned.

  Referring to FIG. 2 together with FIG. 1, a locking means 34 is disposed on the inner peripheral surface of the tamper evidence skirt 22. In the illustrated embodiment, the locking means 34 is composed of five locking protrusions 36 that are disposed at intervals in the circumferential direction and extend in the circumferential direction. The vertical cross-sectional shape of each main portion (excluding both end portions) of the locking projection 36 is a substantially right triangle shape, and the upper surface extends slightly inwardly in the radial direction and extends outward in the radial direction. And a lower surface extending downward and inclined. At both ends in the circumferential direction of the locking projection 36, the amount of protrusion inward in the radial direction is gradually reduced toward both ends in the circumferential direction as shown in FIG. 2, and also understood by referring to FIG. As shown, both end edges of the lower surface are inclined downward in the center in the circumferential direction. If desired, the locking means 34 is constituted by annular locking protrusions extending continuously in the circumferential direction, instead of the plurality of locking protrusions 36 disposed in the circumferential direction and extending in the circumferential direction. You can also. 1 and FIG. 3, the region above the locking means 34 on the inner peripheral surface of the tamper evidence skirt 22 has a substantially inverted truncated cone shape in which the inner diameter gradually increases downward. It is convenient to be disguised. In the illustrated embodiment, the region above the locking means 34 on the inner peripheral surface of the tamper evidence skirt 22 has an arc shape in the cross-sectional view and gradually protrudes inward in the radial direction downward. Yes. In the cross-sectional view, it is also possible to form a linearly inclined form downward inward in the radial direction.

  A plurality of grooves 40 extending in the central axis direction at intervals in the circumferential direction are disposed in a region above the locking means 34 on the inner peripheral surface of the above-described tamper evidence skirt 22. is important. In the illustrated embodiment, each of the grooves 40 is disposed at a central position in the circumferential direction between the adjacent locking projections 36 when viewed in the circumferential direction. The cross-sectional shape of the groove 40 is substantially triangular, and the depth of the groove gradually increases downward from the upper end and then gradually decreases downward. The lower end of each of the grooves 40 is spaced somewhat upward from the upper end of the locking means 34, as clearly shown in FIG. Accordingly, as clearly shown in FIGS. 1 and 3, an annular surface 41 extending continuously in the circumferential direction remains between the lower end of the groove 40 and the upper surface of the locking projection 36 when viewed in the central axis direction. I'm hurt.

  FIG. 1 also shows the mouth / neck portion 42 of the container together with the container lid 2. The mouth and neck portion 42 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 a male thread 44 and a male thread are formed on the outer peripheral surface of the mouth and neck part 42. A locking jaw portion 46 located below 44 is formed. The locking jaw 46 has an arcuate upper surface whose outer diameter gradually increases downward, a cylindrical outer peripheral surface, and a lower surface extending substantially horizontally. Further provided on the outer peripheral surface of the mouth / neck portion 42 is a support ring 48 positioned below the locking jaw 46 (this support ring 48 is used for transporting containers as is well known to those skilled in the art). ing.

  After the contents are filled in the container, normally, before the container lid 2 is attached to the mouth / neck part 42 of the container, a cleansing liquid, which may be clean water, is sprayed on the outer peripheral surface of the mouth / neck part 42. The contents adhering to the outer peripheral surface of the neck 42 are washed. Thereafter, the container lid 2 is fitted on the mouth-and-neck portion 42, and the container lid 2 is rotated in the closed rotation direction, clockwise as viewed from above in FIG. 1, and the female thread 30 of the container lid 2 is moved to the mouth-and-neck portion. 42 are threaded onto the male thread 44. When the female thread 30 is screwed into the male thread 44 until the state shown in FIG. 1, the inner seal piece 8 of the container lid 2 enters the mouth neck part 42 and is brought into close contact with the inner peripheral surface of the mouth neck part 42. The annular protrusion 12 is brought into intimate contact with the top surface of the mouth-and-neck portion 42, and the outer seal piece 10 is brought into intimate or close proximity to the outer peripheral surface of the mouth-and-neck portion 42, thus sealing the mouth-and-neck portion 42. The locking protrusion 36 disposed on the inner peripheral surface of the tamper evidence skirt 22 elastically moves the locking jaw 46 of the mouth neck portion 42 (that is, by elastic deformation or displacement of the tamper evidence skirt 22). It gets over and is positioned below the locking jaw 46. In this state, as understood by referring to FIG. 3 together with FIG. 1, the region above the locking means 34 on the inner peripheral surface of the tamper evidence skirt 22 is the engagement of the mouth and neck portion 42. It is contacted or brought into close contact with the lower end of the outer peripheral surface of the stop jaw 46. However, in the container lid 2 configured according to the present invention, the groove 40 extending in the central axis direction is spaced apart in the circumferential direction in the region above the locking means 34 on the inner peripheral surface of the tamper evidence skirt 22. Since the groove 40 extends downward beyond the lower surface of the locking jaw 46 of the mouth / neck 42, the locking jaw 46 of the mouth / neck 42 and the tamper evidence skirt 22 are formed. A plurality of drainage passages 50 that allow the liquid to flow are defined between the inner peripheral surface and the inner peripheral surface.

  After mounting the container lid 2 on the mouth / neck part 42 as required, cleaning liquid, which may be clean water, is sprayed onto the container lid 2, and then cleaning is performed by spraying dry gas, which may be air, onto the container lid. Remove water. According to the experience of the present inventors, the groove 40 is not formed in the container lid 2, and the liquid is formed between the locking jaw portion 46 of the mouth / neck portion 42 and the inner peripheral surface of the tamper evidence skirt portion 22. If a plurality of drainage passages 50 that allow the flow of water are not defined, after the dry gas is sprayed onto the container lid 2, the cleaning liquid that has been sprayed onto the mouth-neck portion 42 of the container and remained there It tends to flow out through the slit 24 in the direction breaking line 18 and adhere to and remain on the outer peripheral surface of the tamper evidence skirt 22. However, in the case of the container lid 2 configured in accordance with the present invention, the drainage path 50 is defined due to the presence of the groove 40, so that it is injected into the mouth-neck portion 42 of the container and remains there. The cleaning liquid flows down through the drainage passage 50. Therefore, it is avoided as much as possible that the cleaning liquid sprayed on the mouth-neck portion 42 of the container and remaining therein flows out through the slit 24. After the dry gas is sprayed onto the container lid 2 and the washing water is removed, usually the outer peripheral surface of the tamper evidence skirt 22 is printed with a shelf life or the like by, for example, an inkjet printer. Since it is avoided as much as possible that the cleaning liquid sprayed on the portion 42 and remaining there flows out through the slit 24, printing such as the expiration date is not hindered.

  When opening the mouth-and-neck portion 42 to consume the contents, the container lid 2 is rotated in the opening direction, that is, counterclockwise as viewed from above in FIG. Thus, the screwing of the male screw 44 and the female screw 30 is gradually released, and the main portion 20 of the skirt wall 6 is moved upward in the axial direction along with the rotation. On the other hand, the tamper evidence skirt 22 is prevented from moving upward in the axial direction because the locking projection 36 is locked to the locking jaw 46, and thus stress is generated in the bridging portion 26 of the breaking line 18. The bridging portion 26 is broken, and the tamper evidence skirt 22 is separated from the main portion 20 of the skirt wall 6. When the breaking line 16 is broken, it remains in the region above the locking means 34 in the tamper evidence skirt 22, more specifically, between the lower end of the groove 40 and the upper surface of the locking means 34. Since the annular surface 41 is brought into close contact with the lower end portion of the outer peripheral surface of the locking jaw portion 46 of the mouth-and-neck portion 42, the elastic deformation or displacement of the tamper evidence skirt portion 22 is suppressed, and the breaking line 16 is broken. It is sufficiently reliably avoided that the locking projection 36 rises over the locking jaw 46 without being pushed. After the breaking line 18 is broken, the tamper evidence skirt 22 is left on the mouth and neck portion 42, and the top wall 4 of the container lid 2 and the main portion 20 of the skirt wall 6 are free to move upward in the axial direction along with the rotation. Is moved away from the mouth-and-neck portion 42, and thus the mouth-and-neck portion 42 is opened. If desired, an axial break line is formed in the tamper evidence skirt 22 and when the container neck 42 is opened, the axial break line is broken, while the break line 18 extends in the circumferential direction. The tamper evident skirt 22 is expanded from the endless ring to the end ring, and the entire container lid 2 is detached from the mouth and neck 42 together with the tamper evidence skirt 22. It can also be made.

2: Container lid 4: Top wall 6: Skirt wall 18: Circumferential break line 20: Main part of skirt wall 22: Tamper evidence hem 24: Slit 26: Bridge 30: Female thread 34: Locking means 40: Groove 42: Mouth and neck 44: Male thread 46: Locking jaw 50: Drainage channel

Claims (4)

A circular top wall and a cylindrical skirt wall depending from the periphery of the top wall, and a plurality of slits extending in the circumferential direction at intervals in the circumferential direction and a plurality of slits existing between the slits. A rupture line extending in the circumferential direction is formed, and the skirt wall is partitioned into a main portion above the rupture line and a tamper evidence hem below the rupture line. A synthetic resin container lid in which a female thread is formed on the inner peripheral surface of the main portion, and a locking means is disposed on the inner peripheral surface of the tamper evidence skirt,
A plurality of grooves extending in the central axis direction are arranged at intervals in the circumferential direction in the region above the locking means on the inner peripheral surface of the tamper evidence skirt to allow liquid flow. A synthetic resin container lid, characterized in that the lower end of the groove is spaced upward from the upper end of the locking means .   The locking means is composed of a plurality of locking projections arranged in the circumferential direction and extending in the circumferential direction, and the groove is arranged between adjacent locking projections. Item 8. A synthetic resin container lid according to Item 1. A container having a cylindrical mouth-and-neck portion, on the outer peripheral surface of the mouth-and-neck portion, formed with a male thread and a locking jaw portion positioned below the male thread;
A circular top wall and a cylindrical skirt wall depending from the periphery of the top wall, and a plurality of slits extending in the circumferential direction at intervals in the circumferential direction and a plurality of slits existing between the slits. A rupture line extending in the circumferential direction is formed, and the skirt wall is partitioned into a main portion above the rupture line and a tamper evidence hem below the rupture line. A female thread that is screwed onto the male thread of the container is formed on the inner peripheral surface of the main portion, and a locking means is disposed on the inner peripheral surface of the tamper evidence skirt. A synthetic resin container lid,
The container lid is fitted on the mouth and neck of the container and rotated in the closing direction. When mounted in the manner described above, the locking means of the container lid elastically climbs over the locking jaw of the mouth-neck and is positioned below it, and the inner peripheral surface of the tamper evidence hem of the container lid In the combination in which the region above the locking means in the above is close to or in contact with the locking jaw of the mouth and neck,
A plurality of grooves are provided at intervals in the circumferential direction in the region above the locking means on the inner peripheral surface of the tamper evidence skirt , and the lower end of the groove is the bottom of the locking means. A plurality of drainage passages that allow fluid flow are defined between the locking jaw portion of the mouth-neck portion and the inner peripheral surface of the tamper-evident hem portion. A combination characterized by being. The locking means is composed of a plurality of locking projections arranged in the circumferential direction and extending in the circumferential direction, and the groove is arranged between adjacent locking projections. The combination according to Item 3 .