JP2012201402A - Combination of container with synthetic resin lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel and improved combination of a container with a synthetic resin lid maximally preventing a bridge portion on a circumferential breaking line from being broken in mounting a lid on an opening neck portion of the container.SOLUTION: An axial clearance C between a male thread 6 formed on an outer peripheral surface of the opening neck portion and a female thread 46 formed in an inner peripheral surface of a main portion 34 of a skirt wall 20 of the lid is set wider than an axial effective width W of a latch jaw part 8 formed on the outer peripheral surface of the opening neck portion.

Description

  The present invention relates to a combination of a container for a beverage or the like and a synthetic resin lid.

  As a combination of a container and a lid for beverages, as disclosed in Patent Documents 1 and 2 below, a cylindrical mouth and neck outer peripheral surface has a male screw and a locking jaw located below the male screw. Having a circular top surface wall and a cylindrical skirt wall depending from the peripheral edge of the top surface wall. The skirt wall has a slit extending in the circumferential direction at intervals in the circumferential direction and the slit. A circumferential rupture line composed of a bridging portion existing between them is formed, and the skirt wall is divided into a main portion above the circumferential rupture line and a tamper evidence hem below the rupture line. The inner peripheral surface of the main part is formed with a female thread, and the inner peripheral surface of the tamper evidence hem is formed with a locking protrusion that bulges radially inward. A combination with a plastic lid was proposed and put to practical use. That.

  In the combination as described above, the container is filled with the content that is a soft drink, for example, and then the lid is attached to the mouth and neck of the container to seal the mouth and neck. When the lid is attached to the mouth / neck portion of the container, the lid is fitted on the mouth / neck portion of the container, the lid is rotated in the closing direction, and the female thread of the lid is screwed to the male thread of the container. Thus, the lid is gradually lowered with respect to the mouth and neck of the container in accordance with the screwing of the female thread and the male thread, and the lid locking protrusion is caused by the elastic deformation of the tamper evidence skirt. Gets over the locking jaw in the mouth and neck of the container. When opening the mouth-neck portion of the container, the lid is rotated in the opening direction, and the screwing of the female thread on the lid and the male thread on the container is gradually released. The main part of the top wall and the skirt wall of the lid is raised with respect to the mouth and neck of the container in response to the release of the female thread and the male thread, but the tamper evidence hem has a locking protrusion. Since it is locked to the locking jaw, it is prevented from rising, and this creates stress in the bridging portion of the circumferential break line, breaking the bridging portion, and the tamper evident hem is the main part of the skirt wall. Separated from the part. Then, the tamper evidence hem is left in the mouth and neck, the top wall of the lid and the main part of the skirt wall are detached from the mouth and neck, and the mouth and neck are opened. An axial fracture line is formed at the skirt of the tamper evidence, and if one or several of the bridges in the circumferential fracture line are non-breaking bridges, the axial fracture line is broken. As a result, the tamper-evident hem is expanded from an endless annular shape to a banded end, and the locking projection is released from the locking jaw, and the tamper-evident hem continues to be connected to the skirt wall by the non-breaking bridge. The part is also removed from the mouth and neck.

Japanese Utility Model No. 5-13735 JP 59-209545 A

  According to the experience of the inventors, in the conventional combination of the above-described forms, when the lid is attached to the mouth and neck portion of the container and the mouth and neck portion is sealed, the bridging portion in the circumferential break line is broken. It has been found that there is a tendency to be.

  The present invention has been made in view of the above-mentioned facts, and the main technical problem of the present invention is that the bridging portion breaks in the circumferential break line as much as possible when a lid is attached to the mouth and neck of the container. It is to provide a new and improved container and synthetic resin lid combination that is prevented.

  As a result of intensive studies, the present inventors have found that the above-mentioned problem in the conventional combination, i.e., when the lid is attached to the mouth and neck of the container to seal the mouth and neck, the bridging portion in the circumferential break line is The main cause of the problem of breaking is when the locking ridge formed on the inner peripheral surface of the tamper evidence skirt of the lid gets over the locking jaw formed on the outer peripheral surface of the mouth neck of the container The female jaw formed on the inner peripheral surface of the main part of the skirt wall and the mouth and neck of the container are applied with a downward force on the circumferential break line by the cooperation of the locking jaw and the locking protrusion. It has been found that an upward force is applied to the circumferential break line due to the cooperation with the male thread formed on the outer peripheral surface, and the bridging portion in the break line is broken due to this. And based on this knowledge, in the conventional combination, the axial clearance C between the male thread and the female thread, which was set smaller than the axial effective width W of the locking jaw, is used as the axial line of the locking jaw. It has been found that the main technical problem can be solved by setting the effective direction width W or more.

That is, according to the present invention, the combination of the container and the synthetic resin lid is a combination of the container and the synthetic resin lid, and the cylindrical mouth and neck of the container can be achieved. A male thread and a locking jaw part located below the male thread are disposed on the outer peripheral surface of the part, and the lid includes a circular top surface wall and a cylindrical skirt wall depending from the periphery of the top surface wall. The top surface wall is formed with a circumferentially broken line composed of slits extending in the circumferential direction at intervals in the circumferential direction and bridging portions existing between the slits. A tamper-evidence skirt part below the breaking line and a tamper-evidence skirt part below the breaking line, and a female thread is formed on the inner peripheral surface of the main part. The inner surface of the dent hem bulges radially inward In combination ridge is formed,
A combination is provided in which the axial clearance C between the male thread and the female thread is equal to or greater than the axial effective width W (C ≧ W) of the locking jaw.

  The axial clearance C is preferably 0.0 to 0.7 mm larger than the axial effective width W (C−W = 0.0 to 0.7 mm).

  In the combination of the present invention, since the axial clearance C between the male thread and the female thread is set to be equal to or larger than the axial effective width W of the locking jaw, the inner circumference of the tamper evidence hem of the lid When the locking ridge formed on the surface gets over the locking jaw formed on the outer peripheral surface of the mouth and neck of the container, the female thread engaged with the lower side of the male thread is more than that. It is possible to avoid the force applied to the circumferential break line of the skirt wall from being displaced toward the upper side of the male thread located below, and the bridging portion at the circumferential break line to be broken. Is prevented.

The front view which shows a suitable embodiment of the combination comprised according to this invention in part in cross section. The front view which shows a part in cross section the lid | cover in the combination shown in FIG. The bottom view of the lid | cover in the combination shown in FIG. The fragmentary sectional view for demonstrating the behavior at the time of mounting | wearing with the lid | cover to the mouth neck part of a container in the combination shown in FIG. The fragmentary sectional view for demonstrating the behavior at the time of mounting | wearing with the lid | cover on the mouth neck part of a container in the conventional combination.

  Hereinafter, preferred embodiments of a combination configured according to the present invention will be described in more detail with reference to the accompanying drawings.

  Referring to FIGS. 1 to 3, the combination constructed in accordance with the present invention is composed of a container whose only neck portion 2 is shown in FIG. . A container which can be formed from an appropriate synthetic resin such as polyethylene terephthalate or glass has a cylindrical mouth and neck portion 2, and three male threads 6 are provided on the outer peripheral surface of the mouth and neck portion 2. A locking jaw portion 8 positioned below the male thread 6 and a support ring 10 positioned further below the locking jaw portion 8 are disposed. The locking jaw portion 8 has an upper surface 12 extending obliquely outward in the radial direction downward, an outer peripheral surface 14 extending substantially vertically, and a lower surface 16 extending substantially horizontally. Since the container itself provided with such a mouth-and-neck part 2 is a well-known form, the detailed description is abbreviate | omitted in this specification.

  The container lid 4 that can be injection-molded or compression-molded from a suitable synthetic resin such as polyethylene or polypropylene includes a circular top wall 18 and a cylindrical skirt wall 20 depending from the periphery of the top wall 18. . A cylindrical inner seal piece 22 that hangs downward and a cylindrical outer seal piece 24 that also hangs downward are formed on the outer peripheral edge of the inner surface of the top wall 18. Further, a relatively small annular protrusion 26 is formed between the inner seal piece 22 and the outer seal piece 24.

  The skirt wall 20 has a relatively thick upper portion 28 and a relatively thin thin portion 30. A rupture line 32 extending in the circumferential direction is formed at the upper end portion of the thin lower portion 30, and the skirt wall 20 has a main portion 34 above the rupture line 32 and a tamper evidence skirt portion 36 below the rupture line 32. It is divided into. In the illustrated embodiment, the breaking line 32 includes a plurality of slits (cut grooves) 38 extending in the circumferential direction at intervals in the circumferential direction and a plurality of bridge portions 40 remaining between the slits 38. The tamper evidence skirt portion 36 is connected to the main portion 34 via a plurality of bridging portions 40. The slit 38 can be formed by cutting a required portion of the skirt wall 20 with an appropriate cutting blade after the injection or compression molding process. If desired, the slit 38 and the bridge 40 can be formed in an injection or compression molding process.

  On the outer peripheral surface of the lower end portion of the thick upper portion 28 in the main portion 34 of the skirt wall 20, an annular overhang 42 projecting radially outward is formed. On the outer peripheral surface of the main portion 34 of the skirt wall 20 above the annular bulge 42, a non-slip knurl 44 composed of uneven shapes alternately present when viewed in the circumferential direction is formed. Three female threads 46 are formed on the inner peripheral surface of the main portion 34 of the skirt wall 20 (only two female threads are shown in FIG. 2). On the inner peripheral surface of the tamper evidence skirt 36, a plurality of locking protrusions 48 bulged in the radial direction are formed at a slight interval in the circumferential direction, and five in the illustrated case. . Instead of forming the plurality of locking ridges 48 at intervals in the circumferential direction, an annular locking ridge that extends continuously in the circumferential direction can be formed. The vertical cross-sectional shape of each main portion (portion excluding both ends) of the locking protrusion 48 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 large-diameter upper portion 50 and a fitting lower portion 52 are disposed on the inner peripheral surface of the tamper evidence skirt portion 36 above the locking protrusion 48. The large diameter upper part 50 has an inner diameter d1, the fitting lower part 52 has an inner diameter d2, and the inner diameter d2 is set smaller than the inner diameter d1. In the illustrated embodiment, a boundary portion 54 having an inverted frustoconical shape whose inner diameter gradually decreases downward exists between the large-diameter upper portion 50 and the fitting lower portion 52. Refer to the specification and drawings of Japanese Patent Application No. 2011-003327 relating to the application of the present applicant for details of the configuration and operational effects of the large-diameter upper portion 50 and the fitting lower portion 52.

  In the combination configured according to the present invention, the width of the female thread 46 formed on the inner peripheral surface of the main portion 34 of the skirt wall 20 of the lid 4 is set to be relatively small, and the outer periphery of the mouth-and-neck portion 2 is set. The axial clearance C between the male thread 6 formed on the surface and the female thread 46 formed on the inner peripheral surface of the main portion 34 of the skirt wall 20 of the lid 4 (see FIG. 4-C). However, it is important that it is set to be equal to or larger than the effective width in the axial direction of the locking jaw portion 8 (that is, the axial dimension of the outer peripheral surface 14) W. The difference between the axial clearance C and the effective axial width W is preferably about 0.0 to 0.7 mm (C−W = 0.0 to 0.7 mm). The width H of the female thread 46 is advantageously about 1.0 to 1.6 mm from the standpoints of formability (avoids of thread drooping, etc.) and combined drop impact resistance. The difference Dc1-Dc2 between the valley inner diameter Dc1 of the female thread 46 and the mountain outer diameter Dc2 of the male thread 6 is preferably about 0.1 to 0.7 mm.

  When the lid 4 is attached to the mouth and neck 2 after filling the contents in the container and the mouth and neck 2 is sealed, the lid 4 is fitted on the mouth and neck 2 and the lid 4 is closed in the rotation direction. In FIG. 1, it is rotated clockwise as viewed from above, and the female thread 46 of the lid 4 is screwed onto the male thread 6 of the mouth-and-neck portion 2. The lid 4 is gradually lowered as the screwing of the female screw 46 and the male screw 6 proceeds. When the lid 4 is lowered to the position illustrated in FIG. 4A, the inner seal piece 22 enters the mouth and neck portion 2 and is brought into close contact with the inner peripheral surface of the mouth and neck portion 2. 4A, the state shown by a two-dot chain line, that is, the state where the female thread 46 is engaged with the upper side of the male thread 6, and the state shown by the solid line in FIG. 4A, that is, the female thread 46 is the male thread 6. The state is engaged with the lower side. When the lid 4 is lowered to the position shown in FIG. 4B, the locking protrusion 48 of the lid 4 rides on the outer peripheral surface 14 of the locking jaw portion 8 of the mouth-and-neck portion 2 mainly due to the elastic deformation of the tamper evidence skirt portion 36. Go up. When the lid 4 is further lowered, as shown in FIG. 4C, the locking ridge 48 gets over the locking jaw portion 8, and at this moment, the locking chin portion 8 and the locking ridge 48 that has passed over the locking ridge portion 48. , A downward force is generated on the skirt wall 20, and due to this downward force, the female thread 46 is in a state indicated by a two-dot chain line in FIG. 4C, that is, the lower side of the male thread 6. 4 is displaced from the state of being engaged to the state shown by the solid line in FIG. 4C. In the combination configured according to the present invention, as described above, the axial clearance C between the male thread 6 and the female thread 46 is set to be equal to or larger than the axial effective width W of the locking jaw portion 8. The female thread 46 is not brought into close contact with the upper side of the male thread 6, so that excessive stress is not generated in the circumferential direction breaking line 32, particularly the bridging part 40, and the bridging part 40 is broken. It is prevented as much as possible. In a state where the lid 4 is lowered to the position shown in FIG. 4D and is attached to the mouth-and-neck portion 2 as required, the female thread 46 is again engaged with the lower side of the male thread 6.

  As shown in FIG. 5, in the conventional combination, the axial clearance C between the male thread 106 and the female thread 146 is smaller than the axial effective width W of the locking jaw portion 108. When a downward force is generated on the skirt wall 120 at the moment when the strip 148 gets over the locking jaw portion 108 and the female thread 146 is displaced downward, the female thread 146 is male threaded as shown by a solid line in FIG. 5B. Close to the upper side of the strip 106. Accordingly, a downward force is generated on the skirt wall 120 by the cooperation of the locking jaw portion 108 and the locking protrusion 148 that has overcome the locking jaw portion 108, and the male screw 106 and the female screw that is in close contact with the upper side thereof. Due to the cooperation with 146, an upward force is applied to the skirt wall 120, and thus there is a tendency that excessive stress is generated in the bridge portion in the circumferential break line and the bridge portion is broken.

  When opening the mouth-and-neck portion 2 to consume the contents, the lid 4 is rotated in the opening direction, that is, counterclockwise as viewed from above in FIG. Since the locking protrusion 48 of the lid 4 is locked to the locking jaw portion 8 of the mouth-and-neck portion 2, the rise of the tamper evidence skirt 36 is prevented, and the breaking line 32, more specifically the bridging portion 40 thereof is prevented. Stress is generated, the break line 32 is broken, and the tamper evidence skirt 36 is separated from the main portion 34 of the skirt wall 20. Thereafter, as the lid 4 rotates in the opening direction, the portion of the lid 4 excluding the tamper evidence skirt 36 is raised, and the tamper evidence skirt 36 is left on the mouth and neck 2 to close the lid 4. Is detached from the mouth-and-neck portion 2, and thus the mouth-and-neck portion 2 is opened.

  In the illustrated embodiment, when the mouth-and-neck portion 2 is opened, the breaking line 32 is broken over the entire circumferential direction, and the tamper-evidence skirt portion 36 is completely separated from the main portion 34 of the skirt wall 20. However, if desired, an additional break line extending in the axial direction is formed in the tamper evidence skirt 36, and when opening the neck 2 the bridge portion in the break line 32 remains without being locally broken. As a result, the tamper evidence skirt 36 continues to be connected to the main portion 34 of the skirt wall 20, and the additional break line of the tamper evidence skirt 36 is broken to change the tamper evidence skirt 36 from an endless ring to an end. It is developed in a band shape so that the locking ridge 48 is unlocked from the locking jaw 8, and the entire lid 4 including the tamper evidence skirt 36 can be detached from the mouth and neck 2. .

2: mouth and neck of container 4: lid 6: male thread 8: locking jaw 18: top wall 20: skirt wall 32: break line 34: skirt wall main part 36: tamper evidence hem 38: slit 40 : Bridge 46: Female thread 48: Locking ridge C: Clearance in the axial direction W: Effective width in the axial direction

Claims (2)

It is a combination of a container and a synthetic resin lid, and a male thread and a locking jaw located below the male thread are arranged on the outer peripheral surface of the cylindrical mouth and neck of the container, The lid has a circular top wall and a cylindrical skirt wall depending from the peripheral edge of the top wall. The top wall has a slit extending in the circumferential direction at intervals in the circumferential direction and a bridging portion existing between the slits. A circumferential break line is formed, and the skirt wall is partitioned into a main portion above the circumferential break line and a tamper evidence hem below the break line, In the combination in which the female thread is formed on the inner peripheral surface of the main part, and the locking protrusion that bulges radially inward is formed on the inner peripheral surface of the tamper evidence skirt,
A combination characterized in that the axial clearance C between the male thread and the female thread is equal to or greater than the axial effective width W (C ≧ W) of the locking jaw.   The combination according to claim 1, wherein the axial clearance C is 0.0 to 0.7 mm larger than the axial effective width W (C−W = 0.0 to 0.7 mm).

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