JPS60183355A - Vessel cover made of synthetic resin 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] [Technical Field] The present invention relates to a container lid made of synthetic resin, and more specifically, a container lid made of synthetic resin, and more specifically, a container lid having a male thread and a locking jaw located below the female thread. The present invention relates to a synthetic resin container lid having pilfer-proof properties for containers having a closed mouth and neck.

<Prior Art> In recent years, synthetic resin containers have been proposed and put into practical use as pilfer-proof container lids for containers such as food and beverage bottles, instead of metal container lids. It has become. Such a synthetic resin container lid includes a top wall and a cylindrical skirt wall that hangs down from the periphery of the top wall. The skirt wall is formed with a weakened line consisting of a plurality of slits extending in the circumferential direction at intervals in the circumferential direction and a plurality of bridges existing between the slits, and the skirt a It is divided into a main part above the line and a pilfer-proof hem part below the weakened line. A female thread is formed on the inner surface of the main portion, and a plurality of locking means are formed on the inner surface of the pilfer-proof hem.

The container lid of the above-mentioned type P is applied to a container having a neck portion in which a male thread and a locking jaw portion located below the male thread are formed on the outer peripheral surface. When closing the mouth and neck of a container with a container cover, the container lid is fitted onto the mouth and neck and rotated in a predetermined direction, that is, the closing direction, and the female thread on the container lid is screwed into the male thread on the mouth and neck. .

In this way, the container lid is lowered as it rotates, and the locking means of the container lid is elastically displaced or deformed.
It passes through the locking jaws on the neck and is then elastically reared back into engagement with the underside of the locking jaws. When opening the neck of the container, the container lid is rotated in the opposite direction, that is, in the opening direction, and then closed. In this way, the female thread on the container lid is moved by the male thread on the mouth and neck, and the container lid is therefore raised as it rotates. However, the pilfer-proof hem cannot rise because the locking means formed on its inner surface engages with the lower surface of the locking jaw of the mouth and neck. Significant stress is created in the bridge at the weakened line causing the bridge to rupture and separate the pilfer-proof skirt from the main portion. Thereafter, the container lid is removed from the neck, leaving the pilfer-proof hem, and the neck is thus opened.

However, the conventional synthetic resin container lids mentioned above have the following problems or drawbacks to be solved.

That is, in conventional synthetic resin container lids, when the container lid is attached to the neck of the container, more specifically, when the locking means of the container lid is passed through the locking jaw of the neck of the container, the container lid is attached to the neck of the container. It is necessary to apply a considerably large rotational torque to the
Therefore, considerable stress is generated in the bridge at the weakened line of the container lid, which often causes the bridge to break. In order to solve this problem, it is possible to increase the strength of the bridge at the weakened line. It is necessary to apply a fairly large rotational torque to the container lid to cause it to break.
Especially for women and children, it becomes extremely difficult to remove the container lid from the mouth and neck of the container. In addition, in order to solve the above problem, it is possible to reduce the radially protruding leaf of the locking means of the container lid, but in this way, when the container lid is attached to the mouth and neck of the container, If the locking means is insufficiently engaged with the lower surface of the locking jaw, when the container lid is removed from the mouth and neck, it will lock with the locking jaw without breaking the bridge at the weakened line. There is a tendency for the container lid to disengage from the means and be disengaged from the mouth and neck, thus impairing the pilfer-proof properties.

<Object of the Invention> The present invention has been made in view of the above facts, and its main purpose is to reduce the weakening line when attaching the container lid to the mouth and neck of the container without causing other problems. An object of the present invention is to provide a synthetic resin container lid having a pilfer-proof property and improved so that breakage of a bridge portion can be reliably avoided.

<Summary of the Invention> As a result of intensive studies and experiments, the present inventors have determined that at least one notch is located at the upper end of the pilfer-proof hem between the bridging portions in the weakened line when viewed in the circumferential direction. Forming the container can considerably reduce the required rotational torque that must be applied to the container lid when fitting it onto the mouth of the container, without creating other separate problems, and thus It has been found that it is possible to reliably avoid breakage of the bridging portion at the weakened line when attaching the container lid to the mouth and neck.

That is, according to the present invention, the container has a pilfer-proof characteristic for a container having a neck portion in which a male thread and a locking portion located below the male thread are formed on the outer peripheral surface. A container lid made of synthetic resin, comprising a top wall and a cylindrical skirt wall hanging from the periphery of the top wall, the skirt wall having a plurality of slits extending in the circumferential direction at intervals in the circumferential direction. and a plurality of bridges existing between the slits, and the skirt wall has a main portion above the weakened line and a pilfer-proof hem below the weakened line. A female thread is formed on the inner surface of the main portion to be screwed into the male thread of the mouth and neck, and a female thread is formed on the inner surface of the pilfer-proof hem. In the container lid, in which a locking means is formed which is engaged with the locking jaws of the container lid, the upper end of the pilfer-proof hem is provided with a locking means located between the bridging portions when viewed in the circumferential direction. Provided is a container lid, characterized in that at least one notch P is formed therein.

In a preferred embodiment of the invention, one incision is formed substantially in the middle of each of the bridges when viewed in the circumferential direction. The cut may be a notch or a cut.

<Preferred Embodiment of the Invention> Hereinafter, a specific example of the synthetic resin container lid improved according to the present invention will be described in more detail with reference to the accompanying drawings.

The stone described with reference to FIG. 1 and the illustrated container lid may be molded by compression or injection molding from any suitable synthetic resin material, such as polyethylene or polypropylene, and are generally designated by the number 2. It has a main body. This lid body 2 includes a circular top wall 4 and a top wall 40.
It has a cylindrical skirt wall 6 depending from the periphery.

An annular protrusion 8 is formed on the inner surface of the top wall 4, and a sealing liner 10 formed separately from the lid body 2 is disposed within the annular protrusion 8.

The sealing liner 10 can be formed directly at a desired position on the inner surface of the top wall 4 by a well-known embossing process after the lid body 2 has been molded, or it can be formed into a predetermined shape completely separately from the lid body 2. It can be molded and then inserted into the inner surface of the top surface M4 of the lid body 2.

If desired, the sealing liner 10 can be formed integrally with the lid body 2.

A weakened line 12 extending in the circumferential direction is formed in the skirt wall 6, and the skirt wall 6 is divided into a main portion 14 above the weakened line 12 and a pilfer-proof hem portion 16 below the weakened line 12. has been done. The weakened line 12 itself includes a plurality of slits 18 (18 in the illustrated case) extending in the circumferential direction at intervals in the circumferential direction, and a plurality of slits 18 (18 in the illustrated case) located between the slits 18. It consists of a bridging part 20 and a wide pilfer-proof hem part 1.
6 is connected to the main part 14 by a plurality of bridge parts 20. Such a weakened stomach can be formed when molding the lid main body 2, or can be formed by cutting the slits 18 after molding the lid main body 2.

Advantageously, the outer surface of the main portion 14 of the skirt wall 6 is provided with an uneven or knurled shape 22 to prevent fingers from slipping thereon. A female thread 24 is formed on the inner surface of the main portion 14 . Locking means 26 are formed on the inner surface of the pilfer-proof hem 16, which is advantageously thinner than the main portion 14. The locking means 26 in the illustrated example is comprised of an annular protrusion that extends continuously in the circumferential direction. Referring to FIG. 2 together with FIG. 1, the annular protrusion includes an upper portion 28 that gradually projects downward in the axial direction and radially inward, and an upper portion 28 that gradually retracts outward in the radial direction in the downward axial direction. It is advantageous to have a lower part 30 that is rounded, and the boundary area between the upper part 28 and the lower part 30 to be rounded, and to have an overall smooth shape with no corners. The inclination angle α of the upper part 28 with respect to the inner surface of the pilfer-proof hem 16 is between 45 and 85 degrees, in particular between 60 and 80 degrees) Conveniently, the angle β is between 5 and 75 degrees, especially between 10 and 60 degrees. If desired, the locking means 26 can be constructed from a plurality of circumferentially spaced protrusions or plugs of any suitable shape.

11- Therefore, in the container lid improved according to the present invention,
It is important that at least one incision 32 is formed at the upper end of the pilfer-proof hem 16, which is located between the bridges 20 in the line of weakness 12 when viewed in the circumferential direction. In the illustrated example, the upper end of the building 7 hoop roof hem 16 has a plurality of cuts (18 in the illustrated case) located approximately in the middle of each bridge section 20 when viewed in the circumferential direction. A multilayer 32 is formed. Of course, a cut 9 is made at the upper end of the pilfer-proof hem 16 between each of the bridge parts 20.
Instead of forming 2, for example, 1 between the bridges s20
It is also possible to form one incision 32 every other time.

In the illustrated example, the notch 32 itself is composed of a notch in the shape of an inverted isosceles triangle. Notch 32
Such a notch can be formed when molding the lid body 2, or can be formed after molding the lid body 2.
2- Can also be formed by cutting away the material. If desired, instead of forming the indentation 32 from a notch, as shown in FIG. Therefore, the term "kishikomi" used in this specification includes notches and cuts).

The open container lid described above is applied to a container provided with a neck 34, which is known per se, in the form of a open end 9 shown in FIG. A male thread 36 and a locking jaw portion 38 located below the male thread 36 are formed on the outer peripheral surface of the mouth and neck portion 34 .

When the container lid is attached to the mouth part 34 to close the mouth and neck part 34, the container lid is broken into the mouth and neck part 34 and the container lid is inserted in the closing direction, that is, in the fourth direction.
It is rotated clockwise when viewed from above in the figure, thus screwing the female thread 24 of the container lid onto the male thread 36 of the neck portion 34. In this way, the container lid is rotated and moved downwardly, and at this time, the locking means 26 of the container lid is elastically displaced or deformed to pass over the locking jaws 38 of the neck portion 34. When the female thread 24 is fully screwed into the male thread 36, the locking means 26 completely passes through the locking jaws 38 and is elastically restored to lock as shown in FIG. Engages with the lower surface of the jaw portion 38. When the locking means 26 passes over the locking jaws 38, a force acts on the pilfer-proof hem 16 to expand it in the radial direction, but this has been improved according to the present invention. For container lids that have been
Due to the presence of said incision 32, the pilfer-proof skirt 16, in particular its upper end, is relatively easily elastically deformed, so that the required rotational torque to be applied to the container lid is relatively small, and also , the elastic deformation at the upper end of the pilfer-proof skirt 16 absorbs stresses that would otherwise be transmitted to the bridging portion 20 of the weakened line 12 . Therefore, when the locking means 26 passes through the locking jaws 38, it is reliably avoided that excessive stress is applied to the bridge portion 20 of the weakened line 12 and the bridge portion 20 is broken. . When the female thread 24 is fully screwed into the male thread 36, as shown in FIG.
0 is pressed onto the oral part 340, thus the oral part 34
is securely sealed.

When opening the neck part 34, the container lid is rotated in the opening direction, that is, in the counterclockwise direction when viewed from above in FIG.

In this way, the female thread 24 of the container lid is moved by the male thread 36 of the neck portion 34, so that the container lid is moved upward as it rotates. However, the pilfer-proof hem 16 has a locking means 26 formed on its inner surface.
Since it is engaged with the lower surface of the locking jaw part 38 of the mouth and neck part 34, it cannot move upward. Therefore, 1
5- Significant stress is generated in the bridging portion 20 of the line of weakness 12;
This causes the bridging portion 20 to break. After the bridging portion 20 is broken and the pilfer-proof hem 16 of the skirt wall 6 is separated from the main portion 14, the portion of the container lid other than the pilfer-proof hem 16 is moved upward as it rotates. detached from the oral region 34 and thus the oral and cervical region 34
is opened. The pilfer-proof hem 16 is left in the mouth and neck region 34.

As mentioned above, in the illustrated embodiment, when the opening portion 34 is opened, all bridging portions 20 are broken and the pilfer-proof hem portion 16 is completely separated from the main portion 14 of the skirt wall 6; The pilfer-proof hem 16 can therefore remain in place without being dislodged from the neck region 34, but if desired, it can be used, for example, to strengthen one or more of the bridging sections 20 and to Fur-proof 16 - Forming at least one axially extending line of weakening in the hem 16 (such line of weakening may consist of a so-called score or perforation) so that upon opening of the oral part 34, the pill The weakened line formed on the fur-proof hem 16 is broken to create a pilfer-proof hem 16.
The locking means 26 is disengaged from the locking jaws 38, and one or more of the bridges 20, which are firmly attached, are broken. The entire container lid, including the pilfer-proof skirt 16, can thus be removed from the opening 34.

<Examples and Comparative Examples> Polypropylene (melt index 2.0, density 0.
90) was used to form ten container lids in the form of a through hole as illustrated in FIGS. 1 and 2. In the molded container lid, the internal thread diameter d" is 25.6 tan.

Outer diameter D - 30.0 mm, total height H = 1.9.0 bleached, pilfer-proof hem height 11.1 = 4.5 ms, pilfer-proof hem thickness tl == 0.5 m, Radial protrusion tP of the locking means - 0.7 m, upper inclination angle α of the locking means = 70 degrees, lower inclination angle β of the locking means - 20 degrees, circumferential width wl of the bridge portion = 0.7 m, Radial thickness of bridging portion j2-〇, 5mm, height of bridging portion, = 0.
It was 1 payment. Then, the upper end circumferential width of the cut w2−
The depth was 0°8 m and the depth b5 = 1°5.

Ten such powder containers were attached to the mouth and neck of a glass container having a designation of 28w++ in the shape of a container as shown in FIG. 4, and the required rotational torque at this time was measured. Furthermore, it was examined whether the bridging portion was properly broken when the container lid was removed from the mouth and neck.

The results were as shown in Table 1 below.

For comparison, 10 container lids were molded which were identical to the example except that no notches were present.

Then, for 10 such container lids, the polishing rotation torque when attached to the mouth and neck was measured in the same manner as in the example, and the bridging part was removed when detached from the neck. It was inspected to see if it could be broken properly. The results are shown below.
It was as shown in the table.

Table 1 In view of the results shown in Table 1 above, the present invention maintains good rupture of the bridge portion when the container lid is removed from the mouth and neck of the container, and therefore maintains pilfer-proof properties. It is possible to reduce the required rotational torque when attaching a container lid to the mouth and neck without causing damage, and it is therefore possible to reliably avoid breakage of the bridge portion when attaching the container lid to the mouth and neck. is understood.

[Brief explanation of drawings]

FIG. 1 is a side view, partially in section, of a specific example of a container lid improved according to the present invention. 2 is a partial sectional view showing the shape of the locking means in the container lid of FIG. 1; FIG. FIG. 3 is a partial side view showing a modification of the incision. FIG. 4 is a side view, partially in cross section, of the container lid shown in FIG. 1 attached to the mouth and neck of the container. 4...Top wall 6...Skirt wall 12...Weakening line 14...Main part of skirt wall 16...Pilfur-proof hem 18...Slit 20...Bridge part 24... ...Female thread 26...Locking means 32...Incision 34...Container opening 36...Male thread 38...Locking jaw portion

Claims (1)

[Scope of Claims] 1. Pilfer-proof property for a container having a neck portion in which a male thread and a locking jaw portion located below the male thread are formed on the outer peripheral surface. A container lid made of synthetic resin, comprising a top wall and a cylindrical skirt wall hanging from the periphery of the top wall, the skirt wall having a plurality of slits extending in the circumferential direction at intervals in the circumferential direction. and a plurality of bridges existing between the slits, and the skirt wall has a main portion above the weakened line and a pilfer-proof hem below the weakened line. A female thread is formed on the inner surface of the main portion to be screwed into the male thread of the mouth and neck, and a female thread is formed on the inner surface of the pilfer-proof hem. In the container lid, in which a locking means is formed that engages with the locking jaw; at an upper end of the pilfer-proof hem, at least one ring located between the bridging portions when viewed in the circumferential direction; A container lid characterized by having individual notches formed therein. 2. The container lid according to claim 1, wherein one incision is formed approximately in the middle of each of the bridge portions when viewed in the circumferential direction. 3. The container lid according to claim 1 or 2, wherein the notch is an inverted triangular notch. 4. The container lid according to claim 1 or 2, wherein the incision is a cut.