JPS5993658A - Vessel cover having pilfer-proof characteristic - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a container lid with pilfer-proof properties, and more particularly, a container lid having a pilfer-proof property, and more particularly, a top wall and a cylindrical skirt wall depending from the periphery of the top wall, the skirt wall having a A circumferential weakened line is formed that includes a plurality of slits extending in the circumferential direction at intervals in the circumferential direction and a plurality of bridge portions located between the slits, and the skirt wall is connected to the circumferential weakened line. The bridge is divided into a main part above the circumferential weakening line and a pilfer-proof hem below the circumferential weakening line, and one of the plurality of bridge parts has a sufficiently large cross-sectional area. The pilfer-proof characteristic is a bridging part, and an axial weakened line extending in the axial direction is formed in the pilfer-proof hem adjacent to either side edge of the non-breakable bridging part. The present invention relates to a container lid provided with a container lid.

The container lid of the above type is applied to a container such as a food and beverage bottle, which has a neck portion formed with a male thread on the outer peripheral surface and a locking flange located below the male thread. Ru.

When a container lid of the above type is attached to the neck of such a container to seal the mouth and neck, a female thread previously formed on the inner peripheral surface of the main part of the skirt wall is formed on the outer peripheral surface of the mouth and neck. The main part of the skirt wall of the container lid, which is screwed into the male thread formed on the neck or which is fitted onto the neck, is deformed to correspond to the male steam thread formed on the outer circumferential surface of the neck. A female thread is formed on the main part (especially in the case of metal container lids), and the lower end of the pilfer-proof hem of the skirt wall is deformed radially inward to form on the outer peripheral surface of the neck and neck part. or a plurality of locking flap pieces formed in advance on the inner surface of the pilfer-proof hem of the skirt wall are locked to the locking flange formed on the outer peripheral surface of the mouth and neck. urge

When the container lid thus attached to the mouth and neck is removed from the mouth and neck to open the mouth and neck, the container lid is rotated in a predetermined opening direction. In this way, the female thread existing in the main part of the skirt wall is moved along the male thread existing on the outer peripheral surface of the mouth and neck, and the main part of the skirt wall is not moved upward in the axial direction with respect to the mouth and neck. do. On the other hand, the pilfer-proof hem of the skirt wall is prevented from moving upward in the axial direction because it is locked to the locking flange present on the outer peripheral surface of the neck and mouth. Thus, stress is created in the inward line of weakening and the axial line of weakening formed in the container lid. By such stress, at least most of the bridges other than the non-breakable bridges in the circumferential weakened line are broken, and
The axial weakening line is severed to transform the pilfer-proof hem from an annular shape to a band shape. Thereafter, the pilfer-proof skirt is also free to move axially upwards relative to the neck and neck, and the entire container lid is thus removed from the neck.

However, according to the meridian of the present inventors, in the conventional container lid of the above type, the axial weakening line formed at the hem of the pilfer-proof is broken as intended during the above-mentioned opening operation. Due to this, for example, the unbreakable bridging portion that should originally be maintained without being broken is broken, and the pilfer-proof hem is separated from the main part of the skirt wall, and the pilfer-proof hem is separated from the main part of the skirt wall. Undesirable situations often occur, such as the body remaining in the mouth and neck without being removed.

The present invention has been made in view of the above facts, and its main purpose is to ensure that the axial weakening line formed at the hem of the pilfer-proof is broken as intended during the above-mentioned opening operation. An object of the present invention is to provide an improved container lid.

As a result of intensive research and experiments, the present inventors have made the following improvements to the conventional container lid, namely, in a specific range of non-breakable bridges among the plurality of bridges in the circumferential weakened line. The cross-sectional area of at least one bridge present is reinforced by having a cross-sectional area smaller than that of the unbroken bridge but larger than the cross-sectional area of other normal bridges, and thus during said opening operation. is improved by allowing the axial line of weakness to fully rupture while the reinforced bridge remains unruptured.
It has been found that the above objectives can be achieved.

That is, the present invention includes a top wall and a planar skirt wall that hangs down from the periphery of the top wall, and the skirt wall has a plurality of slits extending in the circumferential direction at intervals in the circumferential direction. A circumferential weakened line consisting of a plurality of bridges located between the slits is formed, and the skirt wall includes a main portion above the circumferential weakened line and a pillar below the circumferential weakened line. One of the plurality of bridging parts is a non-breakable bridging part with a sufficiently large cross-sectional area, and one of the edges of the non-breakable bridging part is divided into a fur-proof hem part. In a container lid having pilfer-proof properties, the pilfer-proof hem is formed with an axial weakened line extending in the axial direction adjacent to the pilfer-proof hem;
Among the plurality of bridge parts, the non-breakable bridge part exists within a range of a predetermined angle α, α≦=120 degrees in a direction away from the axial direction weakening line when viewed from the other of the side edges of the non-breakable bridge part. At least one is a reinforced bridge portion having a cross-sectional area smaller than the cross-sectional area of the unbroken bridge portion but larger than the cross-sectional area of a normal bridge portion existing outside the range of the predetermined angle α;
Upon detachment from the container neck, the normal bridge is broken and then the axial line of weakening is completely broken while the reinforced bridge remains unbroken. There is provided a container lid characterized in that the container lid is made to have the following characteristics.

BRIEF DESCRIPTION OF THE DRAWINGS A more detailed description will now be made with reference to the accompanying drawings, which illustrate one embodiment of a container closure improved in accordance with the present invention.

Referring to FIG. 1, the illustrated container lid, generally designated by the numeral 2, is integrally formed from a suitable synthetic resin material such as polyethylene or polypropylene by injection molding or compression molding. There is. The container lid 2 includes a circular top wall 4 and a cylindrical skirt wall 6 that hangs down from the periphery of the circular top wall 4. It is convenient that an annular seal portion 8 of a suitable shape is formed on the inward (lower surface) of the top wall 4 so as to be engaged with the edge of the mouth and neck of the container, as will be described later. A circumferential weakened line 10 is formed in the skirt wall 6, and the skirt wall 6 has a main portion 12 above the circumferential weakened line 10 and a pilfer-proof hem 14 below the circumferential weakened line 10. It is sectioned. The circumferential breaking line 10 itself is a plurality of pieces (eight pieces in the illustrated case) extending in the circumferential direction at intervals in the circumferential direction.
slit 16 and a plurality of (eight in the illustrated case) bridge portions 18a to 18h (
(Please also refer to Figure 2). The plurality of bridge portions 18a to 18h in the illustrated example are arranged at substantially equal angular intervals. As will be described in more detail later, one of the plurality of bridge parts 18a to 18h has a cross-sectional area that is larger than that of the other bridge parts 18b to 1.
The non-breakable bridge portion is sufficiently larger than the cross-sectional area of 8h.

A female thread 2 is provided on the inner peripheral surface of the main portion 12 of the skirt wall 6.
0 is formed. Further, it is convenient that the outer peripheral surface of the main portion 12 is formed with knurling or unevenness 22 so that the container lid 2 can be surely and easily grasped and rotated with fingers. . skirt wall 6
In the specific example illustrated, the pilfer-proof hem 14 has an outer diameter smaller than the outer diameter of the main portion 12 and a wall thickness smaller than the wall thickness of the main portion 12. The pilfer-proof hem 14 has one side edge 24 and 26 of the non-breakable bridging portion 18a in the circumferential weakened line 10, preferably one of the edges 24 and 26 of the container lid 2 when the container lid 2 is removed from the rotational direction of the container. An axial line of weakness 28 is formed adjacent the rearward edge 24 when viewed in the direction of rotation (i.e., counterclockwise when viewed from above in FIG. 1). The axial weakening line 28 may be formed from a so-called perforation, but in the specific example shown, it is formed from a so-called score in which the wall thickness is locally reduced.

The above-described configuration of the illustrated container lid 2 is already known and does not constitute a new feature of the container lid 2 improved according to the present invention. In the container lid 2 improved according to the present invention, the following differences are generated in the cross-sectional area of the plurality of bridge portions 18a to 18h in the circumferential weakened line 10. Referring to FIG. 2 and FIGS. 3-A to 3-D together with FIG. As such, it has a cross-sectional area Sa that is sufficiently larger than the cross-sectional area of the other bridge portions 18b to 18h (FIG. 3-A shows the cross section of the non-breakable bridge portion 18a). Then, this non-breakable bridge portion 1
8a (i.e., the side edge that is not adjacent to the axial weakened line 28 formed in the pilfer-proof hem 14), and thus, in the illustrated case, from the neck of the container to the container. A bridge portion (a bridge portion ( 18b and 18c) have a cross-sectional area (Sb and Sc) of the non-breakable bridge portion 18a.
Although it is smaller than the cross-sectional area Sa of
At least one bridge portion (18b and 18c) existing within the range of the predetermined angle α is reinforced compared to the normal bridge portions 18d to 18h existing outside the range of the predetermined angle α. It is important that the predetermined angle α is α≦120 degrees, preferably α≦90 degrees. In the illustrated case, two bridge parts 18b and 18c exist within a range of a predetermined angle α (α≒90 degrees), and these two bridge parts 18b
and 18c (Figure 3-B shows the cross section of the bridge parts 18b and 18c) are five normal bridges whose cross-sectional areas sb and Sc (Fig. 3-B shows the cross-sections of the bridge parts 18b and 18c) are outside the range of the predetermined angle α. Part 1
The cross-sectional areas of 8d to 18h are made larger than the cross-sectional areas Sd to Sh (Sa>Sb=Se>Sd to Sh).

Furthermore, although it is not necessary, the following differences are generated in the cross-sectional areas Sd to Sh of the normal bridge portions 18d to 18h that exist outside the range of the predetermined angle α. That is, the predetermined angle β when viewed from the front side edge 26 of the non-breakable bridge portion 18n among the normal bridge portions 18d to 18h existing outside the range of the predetermined angle α.
, β≒180 degrees, the cross-sectional areas Sd and Se of the two bridge parts 18d and 18e (Figure 3-C shows the cross-section of the bridge parts 18d and 18e) are as follows. Three bridge portions 18f on the side existing outside the range of the predetermined angle β
, 18g and 18h (Figure 3-D shows the cross section of the bridge portions 18f, 18g and 18h).
d=Se<Sf=Sg=Sh).

The cross-sectional area values of each of the plurality of bridging portions 18a to 18h and their relative ratios are based on the cross-sectional area values of the plurality of bridging portions 18a to 18h and the relative ratios thereof in the circumferential direction weakening line 10 when the container lid 2 is removed from the mouth and neck of the container. 18h and axial weakening line 28
The breaking procedure can be set according to the material characteristics of the container lid 2 and the relative breaking strength of the axially weakened line 28, as will be described later. For reference, here is an example of a skirt wall 6 made of high-density polyethylene.
The inner diameter of the pilfer-proof hem 14 is approximately 27mm.
8 mm, and the maximum residual thickness of the axial weakening line 28 formed on the pilfer-proof hem 14 is approximately 0.8 mm.
In the container lid 2 having a width of 20 mm and a width of about 1.00 mm, Sa≈0.87 mm2 Sb=Se=0.22 mm2 Sd=Se=0.09 mm2 Sf=Sg=Sh=0.13 mm2 (Sa:Sb, Sc: Sd, Se: Sf, S
g, Sh=6.8:1.7:0.7:1), and the expected results were obtained.

The container lid 2 as described above is applied to a container having a neck 30 as shown in FIG.

The cylindrical outer circumferential surface of the mouth and neck portion 30 includes a male thread 32 corresponding to the female thread 20 formed on the inner circumferential surface of the main portion 12 of the skirt wall 6 of the container lid 2, and this male thread 20. A locking flange 34 located below is formed.

When attaching the container lid 2 to the mouth and neck part 30 of the container to seal the mouth and neck part 30, the container lid 2 is fitted onto the mouth and neck part 30, and the container lid 2 is moved in a predetermined closing direction, that is, upward in FIG. The male thread 32 of the mouth and neck part 30 is rotated clockwise when viewed from above.
Thoroughly screw together the female thread 20 of the container lid 2. In this way, as shown in FIG.
The mouth and neck portion 30 are sealed. Then,
For example, patent application No. 56-15141 filed by the present applicant.
The lower part of the pilfer-proof hem 14 is deformed radially inward by, for example, injecting a heated gas flow into the lower part of the pilfer-proof hem 14 in a manner as disclosed in the specification and the drawings of No. 5. As shown in FIG. 4, it is locked to the lower surface of the locking flange 34 of the mouth and neck part 30.

When the container lid 2 attached to the mouth and neck part 30 is removed from the mouth and neck part 30 as described above and the mouth and neck part 30 is opened, the container lid 2 is opened in a predetermined opening direction, that is, when viewed from above in FIG. Rotate counterclockwise. Thus, the customer equipment 2
The female thread 20 is moved along the male thread 32 of the neck 30, and the container lid 2 is therefore moved upward in the axial direction in response to the rotation. On the other hand, the bottom of the pilfer-proof hem 14 of the container lid 2 is connected to the locking flange 3 of the neck part 30.
4, upward movement in the axial direction is prevented. Thus, stress is generated in the circumferential line of weakness 10, more specifically in the bridges 18a to 18h, and stress is generated in the axial line of weakness 28. Therefore, in the illustrated container lid 2 improved according to the present invention, two bridges 18d and 18e of the eight bridges 18a to 18h are connected to their 1^I
q [The areas Sd and Se are made smaller than the cross-sectional areas 8a to 8c and Sf to Sh of the other bridge parts 18a to 18c and 18f to 18h, and are weakened.

Therefore, due to the stress, the weakened bridges 18d and 18e break first.

Next, the remaining six bridge parts 18a to 18c and 18
Three bridge portions 18f to 18h having small cross-sectional areas Sf to Sh are broken at the bottom of f to 18h. After that, the bridging part 18a of the remaining three bridging parts 18a to 18c is a non-breakable bridging part with a sufficiently large cross-sectional area Sa, and the other two bridging parts 18b and 18e are is a reinforced bridge bridging portion with relatively large cross-sectional areas Sb and Se. Therefore, while these bridging portions 18a to 18c are maintained without being broken, the pilfer-proof hem portion 1
The axial line of weakness 28 formed at 4 is broken. In this way, the pilfer-proof hem 14 is developed from an annular shape to a band shape. Next, although it is not necessary,
Two reinforced bridge sections 18b and 18c are cut. In this way, the locking between the lower part of the pilfer-proof hem 14 and the locking flange 34 is sufficiently released, and the entire container lid 2 is separated from the neck portion 30 in the state shown in FIG. . In the state shown in FIG. 5, the belt-shaped pilfer-proof hem 14 is connected to the main portion 12 of the skirt wall 6 by the unbreakable bridging portion 18a, which is maintained without being broken. Due to the weight of the belt-shaped pilfer-proof hem itself, it is spirally displaced downward as it moves away from the non-breakable connecting part 18a in the circumferential direction.

In the illustrated container lid 2 improved according to the invention,
The cross-sectional areas Sb and Sc of the two bridge portions 18b and 18c existing within the range of the predetermined angle α are increased, and the two bridge portions 18b and 18c are strengthened. In addition, not only the unbreakable bridge portion 18a but also these two reinforced bridge portions 18b and 18c are maintained without being broken, so that the pilfer-proof hem portion 14 and the locking flange 34 are still interlocked. The axial weakening line 28 formed in the pilfer-proof hem 14 is caused to rupture while the pilfer-proof hem 14 is sufficiently secured.

Therefore, the axial weakening line 28 is reliably broken before the female thread 20 of the container lid 2 and the male thread 32 of the neck portion 30 are completely unthreaded.

On the other hand, in conventional container lids, the bridges existing within the range of the predetermined angle α are not reinforced, and all bridges except for one unbroken bridge are broken. After that,
It was intended that the axial line of weakness formed in the pilfer-proof hem be broken. In such conventional container closures, all but one unbroken bridge is broken, thus preventing the lower part of the pilfer-proof hem from interlocking with the lower surface of the locking flange. Since it is intended to break the axial lateralization line after the majority has been released, the pilfer-proof hem 14 can be moved beyond the locking flange while the axial weakening line remains unbroken. It often moved upward in the axial direction.

In particular, when the pilfur-proof hem is made of a synthetic resin material, this tendency is large due to elastic deformation of the pilfur-proof hem. In such a case, the threading between the female thread on the container lid and the male thread on the mouth and neck is completely released, and therefore, the portion of the container bell other than the pilfer-proof hem is separated from the mouth and neck. However, the hem of the pilfer proof remained annular and remained in the mouth and neck. Then, by the consumer pulling on the portion of the container lid other than the pilfer-proof hem that was separated from the mouth and neck, the non-breakable bridging portion was ruptured and thus completely separated from the main portion of the skirt wall. It often occurred that the hem of the Pilfer Proof remained ring-shaped and remained in the mouth and neck.

On the other hand, in the container lid 2 improved according to the present invention,
The two bridge parts 18b and 18c existing in the range of the predetermined angle α are reinforced, and while the reinforced bridge parts 18b and 18c are maintained without being broken, the pilfer-proof hem 14 The axial weakening line 28 formed in the pilfer-proof hem 14 is completely broken, and the pilfer-proof hem 14 is expanded from an annular shape to a band-like shape, and the lower part of the pilfer-proof hem 14 and the locking flange 34 are interlocked with each other. Quite a lot will be lifted. Therefore, the axial weakening line 28
After the container is broken, the entire container 2 is often removed from the neck part 30 while the reinforced bridge parts 18b and 18c continue to be maintained without being broken. Therefore, the reinforced bridge portions 18b and 1 existing within the range of the predetermined angle α
Even if 8c continues to be maintained without being broken, no particular problem will occur. However, the reinforced bridge portion 18b
and 18c, both or one of the bridging portions 18d and 18e existing within the range of the predetermined angle β remain unbroken and maintained even after the radial direction weakening line 28 is broken, If the entire container lid 2 is separated from the neck portion 30, some problems will occur. That is,
Unbreakable bridge portion 18a and reinforced bridge portions 18b and 18c
In addition, if both or one of the bridging portions 18d and 18e continues to be maintained without being broken, the pilfer-proof hem portion 14 becomes a skirt over approximately half of the circumferential direction, that is, over an angular range of approximately 180 degrees. It will continue to be connected to the main part 12 of the wall 6, and in such a case, when the container lid 2 that has been removed from the mouth and neck part 30 is reattached to the mouth and neck part 30, the already broken bridge parts 18f and 18g will be removed. and 18h and at the rupture site at the axial line of weakness 28, sufficient gaps are not created, so that it is not always clearly enough recognized that the mouth and neck area 30 has already been opened, and the pilfer-proof properties are deteriorated.

In view of these points, in the illustrated container lid 2 improved according to the present invention, the 2
The bridge parts 18d and 18e are connected to the other bridge parts 18f and 18e.
8g and 18h, so that when the package is opened, the two bridge parts 18d and 18e are broken before the other bridge parts 18f, 18g and 18h are broken, thus The two bridge parts 18d and 1
8e is reliably prevented from being maintained without being broken.

The strength of the two bridge parts 18d and 18e was made substantially the same as the strength of the other bridge parts 18f, 18g and 18h.

Although there is a small possibility, the axial weakened line 28 could be ruptured while the bridges 18f, 18g, and 18h were ruptured, but both or one of the bridges 18d and 18e remained unbroken. Sometimes. In this way, the pilfer-proof hem 14 is expanded from an annular shape to a band-like shape, and approximately 18 mm from the developed end of the pilfer-proof hem 14 is expanded.
Continuously over each degree range of 0 degrees, the pilfer-proof hem 14 is separated from the main part of the skirt wall, thus interlocking the lower part of the pilfer-proof hem 14 with the underside of the locking flange 34. will be lifted considerably. Therefore, especially when the pilfer-proof hem 14 is made of a synthetic resin material, the bridging parts 18d and 18e are maintained without being broken due to the elastic deformation of the pilfer-proof hem 14. There is a possibility that the entire container lid 2 may be detached from the mouth and neck portion 30.

Hereinafter, a specific example of the container body improved according to the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited to such specific example, and there are no departures from the scope of the present invention. Needless to say, various modifications and modifications are possible.

In particular, although the invention has been described with respect to container lids made entirely of synthetic resin material, the invention may also be applied to container lids made wholly or partially of metallic material. In addition, in the illustrated example, a female thread is formed in advance on the inner surface of the main part of the skirt wall, but after the container lid is fitted onto the neck and mouth, the main part of the skirt wall is attached to the male thread on the neck and the mouth. The present invention can also be applied to a so-called roll-on container lid that is deformed accordingly to form a female thread on the main portion of the skirt wall. Furthermore, in the illustrated example, the lower part of the pilfer-proof hem is deformed radially inward and locked to the lower surface of the locking flange, but the inner peripheral surface of the pilfer-proof hem is deformed in the circumferential direction. The present invention is also applicable to a container lid in which elastic flap pieces or the like are formed in advance at intervals and are locked to the lower surface of a locking flange.

[Brief explanation of drawings]

FIG. 1 shows an example of a container lid improved according to the present invention.
FIG. 3 is a side view partially shown in cross section. FIG. 2 is a sectional view taken along line II-II in FIG. 1. 3-A, 3-B, 3-C, and 3-D are enlarged sectional views showing cross sections of various bridge sections. Figure 4 shows the state in which the container lid of Figure 1 is attached to the mouth and neck.
FIG. 3 is a side view partially shown in cross section. FIG. 5 is a side view showing the state after the container lid of FIG. 4 has been removed from the mouth and neck. 2...Container lid 4...Top wall 6...Skirt wall 10...Circumferential breaking line 12...Main part of skirt wall 14...Pilfur-proof hem 16...Slit 18a From 18h to 18h...Bridge portion (18a...Unbroken bridge portion) (18b and 18c...Reinforced bridge portion) 28...Axis direction fracture line to Samurai 14' [Applicant [1 piece] Agent to Crown Cork Co., Ltd. Ben Ill-J: 7'r
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Claims (6)

[Claims] 1. The skirt wall includes a top wall and a cylindrical skirt wall that hangs down from the periphery of the top wall, and the skirt wall has a plurality of slits extending in the circumferential direction at intervals in the circumferential direction, and a plurality of slits located between the slits. A circumferential weakened line consisting of a bridging portion is formed, and the skirt wall is divided into a main portion above the circumferential weakened line and a pilfer-proof hem below the erroneous circumferential weakened line. one of the plurality of bridges is a non-breakable bridge with a sufficiently large cross-sectional area, and the pilfer proof is adjacent to either side edge of the non-breakable bridge. In a container lid having pilfer-proof properties, the hem is formed with an axial line of weakening extending in the axial direction; At least one piece existing within a predetermined angle α, α≦120 degrees in the direction away from the axial weakening line when viewed from the other side of the edge, is smaller than the cross-sectional area of the non-nuclear bridging portion but at the predetermined angle. A reinforced bridge portion having a cross-sectional area larger than that of a normal bridge portion existing outside the range of α, and when detached from the container neck and neck, the normal bridge portion is broken, A container lid characterized in that the axial weakened line is then allowed to completely break while the reinforced bridge remains unbroken. 2. 2. The container lid according to claim 1, wherein one of the both side edges of the non-breakable bridging portion is a rear side edge when viewed in the direction of rotation of the container lid when detached from the container neck. 3. The container lid according to claim 1 or 2, wherein the predetermined angle α is α≦90 degrees. 4. Any one of claims 1 to 3, wherein there are two or more bridge portions within the range of the predetermined angle α, and all of these bridge portions are the reinforced bridge portions. Container lid as described in . 5. A traverse of the normal bridge portion that exists within a range of a predetermined angle β, β = 180 degrees, in a direction away from the axial weakening line when viewed from the other of the both side edges of the unbroken bridge portion. The container lid according to any one of claims 1 to 4, wherein the area is smaller than the cross-sectional area of the area outside the predetermined angle β. 6. The container lid according to any one of claims 1 to 5, which is entirely made of a synthetic resin material.