JP5160315B2 - Synthetic resin container lid with tamper evident characteristics - Google Patents

Description

  The present invention is a tamper evidence that is applied to a container that contains a beverage or the like in which a male thread and a locking jaw part positioned below the male thread are formed on the outer peripheral surface of the mouth and neck. The present invention relates to a synthetic resin container lid having characteristics (characteristics in which traces remain when the container lid is operated to add fraud).

  In the following Patent Documents 1 and 2, a tamper-evident characteristic is applied to a container in which a male thread and a locking jaw located below the male thread are formed on the outer peripheral surface of the mouth and neck. A synthetic resin container lid provided with a top wall and a skirt wall that hangs down from the top wall, the skirt wall is formed with circumferentially breaking means extending in the circumferential direction. The main part above the direction breaking means and the tamper evidence hem below the circumferential breaking means are partitioned, and the inner peripheral surface of the main part of the skirt wall cooperates with the male thread on the neck of the mouth and neck There is disclosed a synthetic resin container lid in which a female thread is formed, and locking means for cooperating with a locking jaw portion of the mouth and neck portion is formed on the inner peripheral surface of the tamper evidence skirt. The circumferential breaking means includes a plurality of bridging portions that are spaced apart in the circumferential direction and connect the tamper evidence skirt to the main portion of the skirt wall, and the tamper evidence hem includes a tamper evidence. The axial direction breaking means comprised from the slit extended substantially continuously from the upper end of a skirt part to a lower end is formed. The bridging portions located on both sides in the circumferential direction of the axial direction breaking means adjacent to the axial direction breaking means are high-strength bridging portions having a larger cross-sectional area than other bridging portions.

When sealing the mouth and neck by attaching a container lid to the mouth and neck of the container, the container lid is fitted on the mouth and neck and rotated in the closing direction, and thus the container lid is placed on the male thread of the mouth and neck. Screw the female thread. The container lid is lowered with respect to the mouth and neck in accordance with the screwing of the male thread and the female thread, and the locking means of the container lid elastically climbs over the locking jaw of the container lid and engages the lower surface thereof. It can be stopped. When opening the mouth and neck of the container, the container lid is rotated in the opening direction. As a result, the female thread of the container lid is moved along the male thread of the mouth-and-neck and the screwing of both is released, so that the container lid rises with respect to the mouth-and-neck with the rotation in the opening direction. Is done. However, since the locking means formed on the tamper evidence hem is locked to the locking jaw of the mouth and neck, the tamper evidence hem is prevented from rising, and this causes the circumferential direction Stress is generated in the breaking means. In response to such stress, either one of the high-strength bridging portions disposed on both sides of the axial direction breaking means is left, and the remaining bridging portions are all broken, thus the tamper evidence hem portion is high. It is developed in the form of an end band connected to the main part of the skirt wall through only one of the strength bridging parts. Thereafter, the tamper evidence skirt is also raised together with the main portion of the skirt wall, and the entire container lid is detached from the mouth and neck.
Japanese Patent No. 3847868 Japanese Patent No. 3939808

  As described above, the synthetic resin container lid has the tamper evident hem separated from the skirt wall by breaking the circumferential rupture means over the entire circumference in the opening of the neck and neck. The tamper-evidence characteristics are superior to the synthetic resin container lids that remain in the mouth-neck without leaving the mouth-neck (the tamper-evidence hem remains in the mouth-neck In the case of the squeezed form, it is not always clear that the circumferential direction breaking means has already been broken when the part other than the tamper evidence hem of the container lid detached from the mouth and neck is attached to the mouth and neck again. The tamper-evidence skirt does not need to be cut off with a knife or the like to separate from the mouth and neck for so-called separate collection of garbage. However, according to the experience of the present inventors, there are the following problems to be solved. That is, when the container lid is detached from the mouth / neck portion of the container, the tamper evidence skirt portion spirals downward from the portion connected to the skirt wall. Therefore, when the container lid is reattached to the mouth / neck portion of the container and the mouth / neck portion is temporarily sealed, the tamper evidence hem that extends in a spiral shape hinders the remounting operation. In order to reattach the container lid to the mouth / neck portion, a complicated operation of separating the tamper evidence skirt from the main portion of the skirt wall or displacing the tamper evidence skirt in an appropriate direction is required. The separated tamper evidence skirt tends to be dumped as so-called garbage.

  The present invention has been made in view of the above-mentioned facts, and the main technical problem is that when the mouth and neck are opened, the entire container lid including the tamper evidence hem is detached from the mouth and neck. The tamper evidence hem extends spirally downward from the part connected to the main part of the skirt wall, ensuring that the tamper evidence hem prevents obstruction of the container lid remounting operation. It is a novel and improved synthetic resin container lid.

  As a result of diligent research, the inventors have made a specific relationship between the arrangement position of the axial direction breaking means formed in the tamper evidence skirt and the arrangement position of the non-breaking area in the circumferential direction breaking means. The present inventors have found that the main technical problems can be achieved.

That is, according to the present invention, as a synthetic resin container lid that achieves the main technical problem described above, the outer peripheral surface of the mouth-and-neck portion has a male thread and a locking jaw portion positioned below the male thread. A synthetic resin container lid having tamper evidence characteristics applied to a formed container,
A top wall and a skirt wall depending from the top wall, and circumferential rupture means extending in the circumferential direction is formed on the skirt wall, the skirt wall being located above the circumferential rupture means. And a tamper-evidence hem below the circumferentially breaking means, and a female cooperating with the male thread of the mouth and neck on the inner peripheral surface of the main part of the skirt wall A thread is formed, and a locking means for cooperating with the locking jaw of the mouth and neck is formed on the inner peripheral surface of the tamper evidence hem, and the circumferential direction breaking means is spaced in the circumferential direction. A plurality of bridging portions disposed at the tamper evidence hem and connected to the main portion of the skirt wall, the tamper evidence hem from the upper end of the tamper evidence hem. An axial direction breaking means composed of a slit extending substantially continuously to the lower end is formed. In the synthetic resin container closure,
The circumferential rupture means includes a single high-strength bridging portion or a non-breaking region composed of a plurality of high-strength bridging portions arranged at intervals in the circumferential direction,
The axial line direction breaking means are arranged at a site diametrically opposed with respect to the non-fracture region, the circumferential sides of the shaft line direction breaking means, adjacent to the axis line direction breaking means, a non-breaking region Although smaller than the total cross-sectional area of the high strength bridging portion which constitutes are disposed strength bridging portion in having the same cross-sectional area in and mutually rather large than the cross-sectional area of the other bridge,
The female thread is screwed onto the male thread, and the locking means is locked to the locking jaw, so that the female thread and the male thread are screwed together. When releasing from the mouth and neck by releasing the non-breaking region is maintained without breaking, at least one of the medium-strength bridging portion is broken with the other bridging portion,
A synthetic resin container lid is provided.

Preferably, when it is detached from the mouth and neck to release the engagement between the female screw thread and the male screw thread is Ru are both breaking of the middle strength bridging portion.

  In the synthetic resin container lid of the present invention, when the container lid is detached from the mouth and neck of the container, the tamper evidence skirt is divided into two arc-shaped pieces in the axial direction breaking means. At least one of the pieces, preferably both, is displaced radially outward about a non-breaking region connected to the main part of the skirt wall and detached from the jaw of the mouth and neck. The tamper evidence skirt does not extend helically and is connected to the main part of the skirt wall because it is displaced radially outward from the main part of the skirt wall as at least one, preferably two arcuate pieces The tamper-evidence hem that is provided does not hinder the remounting operation of the container lid. The medium-strength bridging portions arranged on both sides of the axial direction breaking means formed in the skirt of the tamper evidence are used when the container neck is attached to the mouth and neck of the container to seal the mouth and neck. The axial rupture means, which consists of slits extending substantially continuously from the upper end to the lower end of the evidence hem, are reliably prevented from being excessively opened in the circumferential direction and breaking some bridge parts. To do.

  Hereinafter, with reference to an accompanying drawing, a suitable embodiment of a synthetic resin container lid constituted according to the present invention is described in detail.

  FIG. 1 illustrates a preferred embodiment of a synthetic resin container lid constructed in accordance with the present invention. A container lid, generally designated by numeral 2, which can be formed from a suitable synthetic resin such as polypropylene or polyethylene, includes a circular top wall 4 and a substantially cylindrical skirt wall 6 depending from the periphery of the top wall 4. doing. The skirt wall 6 is formed with a circumferential direction breaking means 8 (this circumferential direction breaking means 8 will be described in more detail later). It is divided into a tamper evidence skirt 12 below the direction breaking means 8.

The outer peripheral surface of the main portion 10 of the skirt wall 6 has a cylindrical shape except for its lower end portion, and the lower end portion has a truncated cone shape whose outer diameter gradually increases. The cylindrical portion of the main portion 10 is formed with a concavo-convex shape 14 for preventing a finger slipping on the cylindrical portion. A female thread 16 is formed on the inner peripheral surface of the main portion 10. The female thread 16 has a so-called auxiliary thread 18 in which the height and width of the thread are reduced at portions spaced in the circumferential direction. The auxiliary screw 18 constitutes a so-called air passage when the mouth and neck of the container is opened. A plurality of slits 19 extending in the circumferential direction are formed at the upper end of the main portion 10 at intervals in the circumferential direction. The upper end of the tamper evidence skirt 12 has a cylindrical shape, but the portion following the upper end has a truncated cone shape whose outer diameter gradually increases downward. A plurality of locking pieces 20 are formed on the inner peripheral surface of the tamper evidence skirt 12 and extend radially inward and upward at intervals in the circumferential direction. As will be further described later, the locking piece 20 constitutes locking means that cooperates with a locking jaw formed on the mouth neck of the container. Two annular seal protrusions, that is, an outer seal protrusion 22 and an inner seal protrusion 24 are integrally formed on the inner peripheral edge of the top wall 4.

  Thus, the configuration of the illustrated container lid 2 as described above exemplifies the configuration of a typical example of the container lid to which the present invention is applied. The novel features of the container lid constructed according to the present invention are as follows. It does not constitute. Therefore, detailed description thereof will be omitted in this specification.

  2 and FIG. 2, in the illustrated embodiment, an annular shoulder surface 26 facing downward is formed at the lower end portion of the inner peripheral surface of the main portion 10 of the skirt wall 6. Further, on the inner peripheral surface of the lower end of the main portion 10 and the inner peripheral surface of the upper end of the tamper evidence skirt 12, ridges 28a and 28b that hang downward from the annular shoulder surface 26 to the upper end of the tamper evidence skirt 12 are provided. It is formed at equal intervals in the circumferential direction. The protrusions 28a and the protrusions 28b are alternately arranged, and the circumferential width of the protrusions 28a is somewhat smaller than the circumferential width of the protrusions 28b. The circumferential direction breaking means 8 is formed by partially cutting the skirt wall 6 from the outer peripheral surface in the region where the protrusions 28a and 28b are formed. More specifically, as clearly understood by referring to FIG. 2, in the regions indicated by the numbers 30, 32 and 34 in the circumferential direction, the depth of cut from the outer peripheral surface of the skirt wall 6 is relatively shallow, Whereas the thickness of the skirt wall 6 is approximately half of the thickness, the depth of cut from the outer peripheral surface of the skirt wall 6 is relatively deep in the regions other than the regions 30, 32, and 34. It is cut over the entire thickness, and only the ridges 28a and 28b are left without being cut. Thus, one high-strength bridge portion 36 having a large cross-sectional area is disposed in the region 30, and a medium-strength bridge portion 38 having a cross-sectional area smaller than that of the high-strength bridge portion 36 in the regions 32 and 34. 40 is disposed. In areas other than the regions 30, 32, and 34, bridging portions 42a and 42b having a small cross-sectional area are disposed corresponding to the protrusions 28a and protrusions 28b. The region 30 where the high-strength bridging portion 36 is disposed constitutes a non-breaking region as will be apparent from the following description.

With further reference to FIG. 2, spaced 180 degrees with respect to the circumferential center of the upper Symbol site diametrically opposite with respect to the high-strength bridging portion 36, i.e. high strength bridging portion 36 An axial direction breaking means 44 is disposed at the site. The axial direction breaking means 44 is preferably constituted by a slit (so-called complete cutting) continuously extending from the upper end to the lower end of the tamper evidence skirt 12, but substantially continuous from the upper end to the lower end. An extending slit (that is, a form in which some uncut portions remain at the intermediate portion or at the upper end or the lower end, but the length and / or the residual thickness of the remaining portion is very small). It is important that the medium-strength bridging portions 38 and 40 are located adjacent to the axial direction breaking means 44 on both sides in the circumferential direction of the axial direction breaking means 44. The separation angles α and β of the axial direction breaking means 44, the medium strength bridging portion 38 and the medium strength bridging portion 40 are advantageously about 0 to 12 degrees. It is preferable that the angle α and the angle β are the same. Also, Ru same der the cross-sectional area of medium strength bridging portion 38 cross-sectional area and medium strength bridging portion 40 of the.

  FIG. 3 shows a state in which the container lid 2 is attached to the mouth / neck portion 46 of the container as required. The mouth / neck portion 46 of the container, which can be formed of a suitable synthetic resin such as glass or polyethylene terephthalate, has a cylindrical shape as a whole, and has a male thread 48 and a lower part of the male thread 48 on the outer peripheral surface thereof. An annular locking jaw portion 50 is formed. After the container is filled with appropriate contents such as a soft drink, the container lid 2 is attached to the mouth-and-neck portion 46. At this time, the container lid 2 is fitted on the mouth-and-neck portion 46, and the container lid 2 is rotated in the closed rotation direction, that is, clockwise when viewed from above in FIG. 3, and thus the female thread 16 in the container lid 2 is rotated. The container lid 2 is lowered according to the rotation by being screwed into the male thread 48 of the mouth / neck portion 46. The locking piece 20 formed on the tamper-evidence skirt 12 of the container lid 2 is elastically deformed and passes through the locking jaw 50 of the mouth-and-neck 46, and then is elastically restored. Locked to the locking jaw 50. When the locking piece 20 passes through the locking jaw 50, a radially outward force acts on the tamper evidence skirt 12, and the axial direction of the tamper evidence skirt 12 is caused by the force. It is assumed that the slit constituting the breaking means 44 is not expanded. However, in the container lid 2 constructed according to the present invention, the medium strength bridge portion 38 (FIG. 2) exists on one side of the slit as viewed in the circumferential direction, and the medium strength bridge portion 40 (FIG. 2) on the other side. ) And the undesired expansion of the slit is sufficiently prevented by the holding action by the medium-strength bridging portions 38 and 40, so that the bridging portions 42a and 42b (FIG. 2) are broken when the container lid 2 is mounted. Is prevented with sufficient certainty. The outer seal ridge 22 and the inner seal ridge 24 formed on the inner surface of the top wall 4 of the container lid 2 are respectively brought into close contact with the outer peripheral surface and the inner peripheral surface of the mouth / neck portion 46, thereby the mouth / neck portion. 46 is sealed.

  When opening the mouth neck portion 46 of the container, the container lid 2 is rotated in the opening rotation direction, that is, counterclockwise as viewed from above in FIG. Thus, since the female thread 16 formed on the main portion 10 of the skirt wall 6 in the container lid 2 is moved along the male thread 48 formed on the mouth-and-neck portion 46 of the container, the container lid 2 Is raised with rotation. However, the tamper evidence skirt 12 of the container lid 2 has the locking piece 20 formed on the inner peripheral surface thereof locked to the locking jaw 50 of the mouth-and-neck portion 46, Movement is prevented. Accordingly, considerable stress is generated in the medium-strength bridging portions 38 and 40 and the bridging portions 42a and 42b (FIG. 2) in the circumferential direction breaking means 8 disposed on the skirt wall 6, and due to such stress. The medium strength bridge portions 38 and 40 and the bridge portions 42a and 42b are broken. However, the high-strength bridging portion 36 (FIG. 2) is maintained without being broken. Thus, as shown in FIG. 4, the tamper evidence skirt 12 is in the form of two arcuate pieces 12a and 12b divided by the axial breaking means 44, each of the two arcuate pieces 12a and 12b being The high-strength bridging portion 36 is displaced outward in the radial direction with both circumferential sides as fulcrums. And the latching of the latching piece 20 with respect to the latching jaw part 50 is cancelled | released by such a deformation | transformation thru | or displacement of the tamper-evidence skirt part 12. Thereafter, the entire container lid 2 including the tamper evidence skirt 12 rises with the rotation in the opening rotation direction and is detached from the mouth neck portion 46, and the mouth neck portion 46 is opened. In the illustrated embodiment, the axial direction breaking means 44 is disposed at a portion facing the high-strength bridging portion 36 in the diametrical direction, and the two arcuate pieces 12a and 12b are formed symmetrically when opening. Is intended to break both the two medium-strength bridges 38 and 40, but is somewhat displaced in the circumferential direction from the portion corresponding to the diametrical direction, particularly with respect to the high-strength bridge 36. When the axial direction breaking means 44 is disposed at the site, and one of the two arc-shaped pieces 12a and 12b is relatively long and the other is relatively short, it is disposed on the shorter arc-shaped piece 12a or 12b. Even if the intermediate altitude bridge portion 38 or 40 is maintained without being broken, no particular problem occurs.

  When some contents remain without consuming all the contents of the container, the container lid 2 detached from the mouth-and-neck part 46 is fitted on the mouth-and-neck part 46 again in the closed rotation direction. Rotate. In response to the rotation in the closing rotation direction, the female thread 16 of the container lid 2 is screwed into the male thread 48 of the mouth-and-neck portion 46, and the container lid 2 is lowered with the rotation. When the container lid 2 is sufficiently lowered, the outer seal ridge 22 and the inner seal ridge 24 formed on the inner surface of the top wall 4 are again brought into close contact with the outer peripheral surface and the inner peripheral surface of the mouth and neck portion 46, As a result, the mouth and neck 46 is temporarily sealed. The tamper-evidence skirt 12 in the container lid 2 once detached from the container neck and neck 46 is in the form of two arcuate pieces 12a and 12b divided by the axial breaking means 44 as shown in FIG. The high-strength bridging portion 36 is displaced outward in the radial direction with both side portions in the circumferential direction as fulcrums. Therefore, when the container lid 2 is remounted on the mouth / neck portion 46 in order to temporarily seal the mouth / neck portion 46, the remounting operation of the container lid 2 is not hindered by the tamper evidence skirt 12.

  5 and 6 show a modification of the high-strength bridging portion formed in the region 30 constituting the non-breaking region. In the modification shown in FIG. 5, no cut is generated in the skirt wall 6 in the region 30, and the high-strength bridging portion 36 exists over the entire thickness of the skirt wall 6. . In the modification shown in FIG. 6, two high-strength bridging portions 36 a and 36 b are arranged in the region 30 constituting the non-breaking region at intervals in the circumferential direction. More specifically, no cut is generated in the skirt wall 6 in the regions 30a and 30b, and two high-strength bridging portions 36a and 36b that exist over the entire thickness of the skirt wall 6 are formed. Has been. On the other hand, in the region between the region 30a and the region 30b, the skirt wall 6 is cut over the entire thickness, and there is no bridge portion. When a plurality of high-strength bridge portions are provided in the region 30 constituting the non-breaking region as in the modification shown in FIG. 6, the total cross-sectional area of the cross-sectional areas of the plurality of high-strength bridge portions. Is larger than the cross-sectional area of each of the medium-strength bridge portions 38 and 40 (FIG. 2), in other words, the cross-sectional area of each of the medium-strength bridge portions 38 and 40 is the total crossing of a plurality of high-strength bridge portions. It is important that it is smaller than the area.

  FIG. 7 illustrates a modification of the medium strength bridge portions 38 and 40. In the modification shown in FIG. 7, the two medium-strength bridging portions 38 and 40 are disposed on both sides of the axial direction breaking means 44 without being spaced from the axial direction breaking means 44. The separation angles α and β between the direction breaking means and the medium strength bridge portions 38 and 40 are substantially zero.

The front view which shows a suitable embodiment of the container lid comprised according to this invention in part in a cross section. FIG. 2 is a sectional view taken along line II-II in FIG. 1. The front view which shows a state with which the container lid shown in FIG. The slope view shown in the state after mounting | wearing the container neck of FIG. 1 to the mouth neck part of a container, and then detaching | releasing from a mouth neck part. The fragmentary sectional view which shows the modification of a non-breaking area | region. The fragmentary sectional view which shows the other modification of a non-breaking area | region. The fragmentary sectional view which shows the modification of a medium-altitude bridge part.

Explanation of symbols

2: Container lid 4: Top wall 6: Skirt wall 8: Circumferential direction breaking means 10: Main part of skirt wall 12: Tamper evidence hem 16: Female thread 20: Locking piece (locking means)
30: Area (non-breaking area)
36: High-strength bridge part 38: Medium-strength bridge part 40: Medium-strength bridge part 42a: Bridge part 42b: Bridge part 44: Axial direction breaking means 46: Mouth neck part 48: Male screw 50: Locking chin

Claims (2)

A synthetic resin container lid with tamper-evident characteristics that is applied to a container having a male thread and a locking jaw located below the male thread on the outer peripheral surface of the mouth and neck. There,
A top wall and a skirt wall depending from the top wall, and circumferential rupture means extending in the circumferential direction is formed on the skirt wall, the skirt wall being located above the circumferential rupture means. And a tamper-evidence hem below the circumferentially breaking means, and a female cooperating with the male thread of the mouth and neck on the inner peripheral surface of the main part of the skirt wall A thread is formed, and a locking means for cooperating with the locking jaw of the mouth and neck is formed on the inner peripheral surface of the tamper evidence hem, and the circumferential direction breaking means is spaced in the circumferential direction. A plurality of bridging portions disposed at the tamper evidence hem and connected to the main portion of the skirt wall, the tamper evidence hem from the upper end of the tamper evidence hem. An axial direction breaking means composed of a slit extending substantially continuously to the lower end is formed. In the synthetic resin container closure,
The circumferential rupture means includes a single high-strength bridging portion or a non-breaking region composed of a plurality of high-strength bridging portions arranged at intervals in the circumferential direction,
The axial line direction breaking means are arranged at a site diametrically opposed with respect to the non-fracture region, the circumferential sides of the shaft line direction breaking means, adjacent to the axis line direction breaking means, a non-breaking region Although smaller than the total cross-sectional area of the high strength bridging portion which constitutes are disposed strength bridging portion in having the same cross-sectional area in and mutually rather large than the cross-sectional area of the other bridge,
The female thread is screwed onto the male thread, and the locking means is locked to the locking jaw, so that the female thread and the male thread are screwed together. When releasing from the mouth and neck by releasing the non-breaking region is maintained without breaking, at least one of the medium-strength bridging portion is broken with the other bridging portion,
A synthetic resin container lid.   2. The synthetic resin product according to claim 1, wherein when the female screw and the male screw are released from each other and released from the mouth-and-neck portion, both the medium-strength bridging portions are broken. Container lid.

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