JP2014122061A - Synthetic resin container lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synthetic resin container lid which is new and improved so as to sufficiently and surely prevent a lower end of a tamper-evident skirt part (20) from shifting inside in the radial direction to be rolled inside when fitting the container lid (2) to a neck (40) of a container and rotating in the closing direction to seal the neck of the container even when the thickness of the tamper-evident skirt part of a skirt wall (6) is very thin.SOLUTION: In an inner peripheral surface of the tamper-evident skirt part, a plurality of reinforcing ribs (38), which extend downward from a lower face of a locking protrusion (36) and of which the inner face inclines outside in the radial direction toward the lower direction, are formed at an interval in the circumferential direction.

Description

  The present invention comprises a synthetic resin container lid, more specifically, a circular top 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 on the skirt wall, The skirt wall relates to a synthetic resin container lid that is partitioned into a main part above the break line and a tamper evidence skirt below the break line.

  As disclosed in the following Patent Documents 1 and 2, as a container lid for a beverage container formed of an appropriate synthetic resin such as polyethylene terephthalate, glass or metal sheet, a circular top wall and a peripheral edge of the top wall It has a cylindrical skirt wall that hangs down, and a rupture line extending in the circumferential direction is formed in 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. Synthetic resin containers are widely used in practice. 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 locking means is composed of a plurality of locking ridges extending in the circumferential direction at intervals in the circumferential direction or one locking ridge extending continuously in the circumferential direction. The container is provided with a cylindrical mouth-and-neck portion, and an outer thread surface of the mouth-and-neck portion is formed with a male screw thread and a locking jaw portion positioned below the male screw thread.

  When a container lid is attached and sealed to the mouth and neck of the container, the container lid is fitted on the mouth and neck of the container, and the container is closed with respect to the mouth and neck. The female thread on the container lid is screwed onto the male thread on the mouth and neck. The container locking means elastically climbs over the locking jaw part of the mouth-neck part and is locked below it.

JP 2012-171646 A JP 2012-201202 A

  Thus, in the case of the conventional container lid as described above, especially when the thickness of the skirt wall tamper evidence hem is set to be considerably thin to reduce the amount of molding material, the container neck and neck are sealed. When the container lid is fitted to the mouth and neck of the container and rotated in the closing direction, the lower end of the tamper evidence hem that contacts the upper surface of the male thread of the mouth and neck is radially outward. Instead, it is displaced inward in the radial direction and is entangled inside, which tends to make the container lid mounting operation impossible.

  The present invention has been made in view of the above-mentioned facts, and the main technical problem thereof is to seal the container neck and neck in order to seal the container neck and neck even when the skirt wall tamper evident hem is considerably thin. When the container lid is fitted on the mouth and neck and rotated in the closing direction, the lower end of the tamper evidence hem is displaced inward in the radial direction with sufficient avoidance. Another object of the present invention is to provide an improved synthetic resin container lid.

  As a result of intensive studies, the inventors have found that a plurality of tamper-evident hems have a plurality of inwardly extending radially outwards extending downward from the lower surface of the locking ridges on the inner peripheral surface. It has been found that the above technical problem can be achieved by forming a plurality of reinforcing ribs at intervals in the circumferential direction.

That is, according to the present invention, the synthetic resin container lid that achieves the above technical problem comprises a circular top wall and a cylindrical skirt wall that hangs down from the periphery of the top wall, and the skirt wall has a circumferential direction. The skirt wall is partitioned into a main portion above the break line and a tamper evidence hem below the break line, and an inner peripheral surface of the main portion is formed on the inner peripheral surface of the main portion. A female thread is formed, and a plurality of locking ridges extending in the circumferential direction at intervals in the circumferential direction or one locking extending continuously in the circumferential direction on the inner circumferential surface of the tamper evidence skirt In a synthetic resin container lid in which locking means composed of ridges are arranged,
A plurality of reinforcing ribs extending downward from the lower surface of the locking ridge and inclined radially outwardly downward from the inner peripheral surface of the tamper evidence skirt are circumferentially spaced. A synthetic resin container lid is provided, wherein a plurality of the lids are formed.

  The lower end of the inner surface of the reinforcing rib is aligned with the lower end of the inner peripheral surface of the tamper evidence hem, in other words, the inner surface of the lower end of the reinforcing rib is aligned with the inner peripheral surface of the lower end of the tamper evidence hem. Is preferred. Preferably, the lower end of the outer peripheral surface of the tamper evidence skirt includes a truncated cone-shaped portion inclined downward in the radial direction, and the lower end of the tamper evidence skirt is increased in thickness. Yes. The locking means is formed of 4 to 6 locking ridges extending in the circumferential direction at equal intervals in the circumferential direction, and each of the locking ridges has the same form, Two to four reinforcing ribs are formed at equal intervals in the circumferential direction with respect to each of the reinforcing ribs, and each of the reinforcing ribs is advantageously in the same form.

  According to the synthetic resin container lid of the present invention, the lower end portion of the tamper evidence skirt is reinforced by the reinforcing rib, and the inner surface of the reinforcing rib is inclined radially outwardly downward. Then, when the lower end of the tamper evidence hem is in contact with the upper surface of the male thread of the mouth and neck, the lower end of the tamper evidence hem is induced and displaced radially outward rather than radially inward, Thus, even when the thickness of the skirt wall tamper evident hem is considerably thin, the tamper is not removed when the container lid is fitted to the container neck and rotated in the closing direction to seal the container neck. The lower end of the evidence skirt is displaced inward in the radial direction and is sufficiently reliably avoided.

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 fragmentary sectional view which shows the behavior of the tamper evidence bottom | hem part at the time of mounting | wearing the container neck 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 has 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. Furthermore, a relatively small annular ridge 9 is formed at the upper end of the outer peripheral surface of the inner seal piece 8.

  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. In the illustrated embodiment, the breaking line 16 includes a plurality of slits (cut grooves) 22 extending in the circumferential direction at intervals in the circumferential direction and a plurality of bridge portions 24 remaining between the slits 22. The tamper evidence skirt portion 20 is connected to the main portion 18 via a plurality of bridging portions 24. In the illustrated embodiment, the circumferential lengths of the plurality of slits 22 are all substantially the same, and the intervals between adjacent slits 22, that is, the circumferential lengths of the bridging portions 24 are all substantially the same. The cross-sectional areas of the plurality of bridging portions 24 are all substantially the same.

  2 together with FIG. 1, the non-slip knurl 26 composed of uneven shapes alternately present in the circumferential direction is formed on the outer peripheral surface of the main portion 18 of the skirt wall 6. Yes. Three female threads 28 are formed on the inner peripheral surface of the main portion 18 of the skirt wall 6. The three female threads 28 are disposed at an angular interval of 120 degrees, and each of the three female threads 28 extends over an angle range of approximately 160 degrees. The lower end portion of the outer peripheral surface of the tamper evidence skirt 20 includes a truncated cone-shaped portion 30 inclined downward in the radial direction and a cylindrical shaped portion 32 formed below the truncated cone-shaped portion 30, and the tamper evidence The bottom end of the skirt 20 is increased in thickness. If desired, the cylindrical portion 32 can be a truncated cone shape that smoothly follows the truncated cone portion 30. A locking means 34 is formed at a substantially intermediate portion in the axial direction on the inner peripheral surface of the tamper evidence skirt 20. The locking means 34 is formed of four to six locking ridges 36 extending in the circumferential direction at equal angular intervals in the circumferential direction, and five locking ridges 36 in the illustrated embodiment. Are in the same form. Instead of forming a plurality of locking ridges 36 at equiangular intervals in the circumferential direction, the locking means 34 may be constituted by a single locking ridge extending continuously in the circumferential direction. it can. The vertical cross-sectional shape of each main portion (portion excluding both ends) of the locking protrusion 36 is a substantially right-angled triangle, and is inclined substantially horizontally downward in the radial direction or radially inward. And has an upper surface that extends.

  A plurality of reinforcing ribs 38 that extend downward from the lower surface of the locking protrusion 36 and incline radially outward toward the lower side are spaced apart in the circumferential direction on the inner peripheral surface of the tamper evidence skirt 20. It is important that a plurality are formed. In the illustrated embodiment, the reinforcing rib 38 has a rectangular cross-sectional shape, and the lower end of the inner surface of the reinforcing rib 38 is matched with the lower end of the inner peripheral surface of the tamper evidence skirt 20. Two to four reinforcing ribs 38 are formed in the same form at equal angular intervals in the circumferential direction with respect to the main portions of the locking protrusions 36, and three reinforcing ribs 38 are formed in the illustrated embodiment. preferable.

  In FIG. 1, the mouth and neck portion 40 of the container together with the container lid 2 is shown by a two-dot chain line. The mouth and neck portion 40 of the container which 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 the outer peripheral surface of the mouth and neck portion 40 has three male threads 42 and A locking jaw 44 is formed below the male thread 42. The three male threads 42 are formed to correspond to the three female threads 28 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. Further provided on the outer peripheral surface of the mouth / neck portion 40 is a support ring 46 located below the locking jaw portion 44 (the support ring 46 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 and neck portion 40 after the contents are filled in the container and the mouth and neck portion 40 is sealed, the container lid 2 is fitted on the mouth and neck portion 40. In this case, first, the lower end of the skirt wall 6 is brought into contact with the upper surface of the male thread 42 as shown by a solid line in FIG. When the container lid 2 is forced further downward while rotating in the closed rotation direction (clockwise as viewed from above in FIG. 1) as necessary, the container lid 2 extends downward from the lower surface of the locking protrusion 36 and has an inner surface. Is formed with a reinforcing rib 38 inclined downward in the radial direction, so that the lower end portion of the skirt wall 6 is inductively displaced radially outward as shown by a two-dot chain line in FIG. The lower end portion of the skirt wall 6 is surely avoided from being displaced inward in the radial direction and being caught inside. When the container lid 2 is further forced downward, the reinforcing rib 38 and the locking protrusion 36 elastically ride over the male thread 42. In the illustrated embodiment, the thickness of the skirt wall 6 is increased by including the frustoconical portion 30 and the cylindrical portion 32, and from this fact, the lower end portion of the skirt wall 6 is radially inward. It is prevented from being displaced inward and being caught inside. When the container lid 2 is further rotated in the closing rotation direction, the female thread 28 of the container lid 2 is screwed into the male thread 42 of the mouth / neck portion 40. When the female thread 28 is screwed onto the male thread 42 until the state shown in FIG. 1, the inner seal piece 8 of the container lid 2 enters the mouth neck 40 and is brought into close contact with the inner peripheral surface of the mouth neck 40. The annular protrusion 9 is brought into intimate contact with the top surface of the mouth and neck portion 40, and the outer seal piece 10 is brought into intimate contact with the outer peripheral surface of the mouth and neck portion 40, thus sealing the mouth and neck portion 40. The reinforcing ribs 38 and the locking protrusions 36 disposed on the inner peripheral surface of the tamper evidence skirt 20 elastically lock the locking jaw 44 of the mouth and neck 40 (that is, the elasticity of the tamper evidence skirt 20). It gets over (by deformation or displacement) and is located below the locking jaw 44.

  When opening the mouth and neck portion 40 to consume the contents, the container lid 2 is rotated in the opening direction (that is, counterclockwise as viewed from above in FIG. 1). Since the locking ridge 36 of the container lid 2 is locked to the locking jaw 44 of the mouth / neck 40, the tamper evidence skirt 20 is prevented from rising, and the break line 16, more specifically the bridging portion thereof, is prevented. Stress is generated at 24, the break line 16 is broken, and the tamper evidence skirt 20 is separated from the main portion 18 of the skirt wall 6. Thereafter, as the container lid 2 rotates in the opening direction, the portion of the container lid 2 excluding the tamper evidence skirt 20 is raised, and the tamper evidence skirt 20 remains in the mouth and neck 40. The container lid 2 is detached from the mouth / neck portion 40, and thus the mouth / neck portion 40 is opened.

  In the illustrated embodiment, when the mouth and neck portion 40 is opened, the breaking line 16 is broken over the entire circumferential direction, and the tamper evident skirt portion 20 is completely separated from the main portion 18 of the skirt wall 6. However, if desired, an additional break line extending in the axial direction is formed in the tamper evidence skirt 20, and when opening the mouth neck 40, the bridge portion in the break line 16 remains without being locally broken. The tamper evidence skirt 20 continues to be connected to the main portion 18 of the skirt wall 6 and the additional break line of the tamper evidence skirt 20 is broken to change the tamper evidence skirt 20 from an endless ring to an end ring. The locking of the locking protrusion 36 to the locking jaw 44 is released and the entire container lid 2 including the tamper evidence skirt 20 can be detached from the mouth / neck 40. That.

2: Container lid 4: Top wall 6: Skirt wall 16: Break line 18: Main part 20: Tamper evidence hem part 22: Slit 24: Bridge part 28: Female thread 30: Frustum shaped part 34: Locking Means 36: Locking ridge 38: Reinforcing rib 40: Mouth and neck portion 42: Male screw 44: Locking jaw

Claims (4)

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 on the skirt wall. And a tamper-evidence skirt portion below the break line, a female thread is formed on the inner peripheral surface of the main portion, and a circumferential direction is formed on the inner peripheral surface of the tamper-evident hem portion. In the synthetic resin container lid in which locking means composed of a plurality of locking protrusions extending in the circumferential direction at intervals or one locking protrusion extending continuously in the circumferential direction is disposed,
A plurality of reinforcing ribs extending downward from the lower surface of the locking ridge and inclined radially outwardly downward from the inner peripheral surface of the tamper evidence skirt are circumferentially spaced. A synthetic resin container lid, wherein a plurality of the container lids are formed.   The synthetic resin container lid according to claim 1, wherein a lower end of the inner surface of the reinforcing rib is matched with a lower end of an inner peripheral surface of the tamper evidence skirt.   The lower end portion of the outer peripheral surface of the tamper evidence skirt includes a truncated cone-shaped portion that is inclined radially outwardly downward, and the lower end of the tamper evidence skirt is increased in thickness. Item 3. A synthetic resin container lid according to Item 1 or 2.   The locking means is formed of 4 to 6 locking ridges extending in the circumferential direction at equal intervals in the circumferential direction, and each of the locking ridges has the same form, 2 to 4 reinforcing ribs are formed at equal intervals in the circumferential direction with respect to each of the first and second reinforcing ribs, and each of the reinforcing ribs has the same configuration. Plastic container lid.

Images