JPH0442252B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a container lid, particularly a container lid that is opened by tearing off a part of the lid. This invention relates to a container lid in which a finger ring is provided with means for detecting a state in which the cap is opened.

[Conventional technology]

Today, aluminum pilfer-proof caps (hereinafter referred to as PP caps) are widely used as caps for beverages such as soft drinks and beer. This type of container lid has a screw structure with the upper part of the cap body rolled on.
The lower part forms a pilfer-proof band part (hereinafter referred to as PP band part) connected via a breakable bridge, and the lowermost part is sealed by being wrapped around the cap jaw. Therefore, in general, this type of cap is
The cap is opened by placing one's finger on the knurled structure at the top and twisting the cap, and the bridge provided at the bottom of the cap breaks at this time to prove pilfer-proof properties (see Figure 4); A structure in which multiple scores are vertically engraved on the PP band at the bottom of the cap can be broken open to prove pilfer-proof properties (see Figure 5) has been implemented.

Further, recently, various tear-type container lids have been proposed, which are opened by tearing off a portion of the container lid. Container lids of this type are generally removed from the container opening following a tearing operation, but some are designed to remain in the container opening for reuse. As an example of the structure of this type of tear-off type container lid, one shown in FIG. 6 is known. This container lid is
A circular plane part 10 covering the opening of the container, a skirt part 12 extending downwardly from the outer peripheral end of the circular plane part 10, and an ear part 14 extending outward from one end of the skirt part 12. It basically consists of tear strength deterioration lines 16, 16 extending symmetrically from both ends of the circular plane part 10 along the vicinity of the outer peripheral end thereof and terminating near the boundary with the skirt part 12, An annular finger ring 18 is connected to the tip of the ear portion 14 . In addition, since a large amount of pressure is concentrated at the connecting portion between the ear portion 14 and the annular finger ring 18 when the cap is opened, a portion of the connecting portion between the ear portion 14 and the annular finger ring 18 is reinforced. Emboss 2
0 is set. Therefore, the container lid configured in this manner can be easily opened by placing a finger on the annular finger ring 18 and pulling it (see Figures 7a, b, and c). .

[Problem that the invention seeks to solve]

These bottles with screw-type aluminum PP caps, which are used in large quantities for soft drinks, have recently been contaminated with pesticides and other poisons after being opened and consumed near the outlet of a vending machine. Malicious incidents such as people being misled into drinking alcohol and resulting in serious illness or death due to poisoning are occurring frequently.

Conventionally used PP caps like this one are widely used because they are screw-type and can be easily opened and resealed.
From the perspective of tampering with poisonous substances for the purpose of mischief, the above-mentioned resealability tends to make pranks easier, and even if the cap has been opened once, consumers may open it for the first time. It becomes a drawback that you fall into such an illusion.

On the other hand, in the tear-off container lid, which is opened by tearing off a portion of the container lid, the user passes the finger through the annular finger ring and, while pulling, breaks the weakening score carved from the cap skirt to the top surface. As a result, the cap is destroyed irreproducibly, so compared to the screw-type cap mentioned above, even if the cap is tampered with, such as by poisonous substances, when the consumer opens the cap,
There is an advantage that it is easy to discover that the bottle has already been opened. However, when consumers use vending machines, it is difficult to visually check whether the vending machine is unopened at night, etc., and some people never drink without checking. do not have.

The inventor has developed the first opening force (seventh force) of this kind of container lid.
We focused on the fact that the ring (see figure a) requires a tensile force of 2 to 3 kg, and because it is necessary to pass your finger inside the ring and pull it firmly toward you when opening the cap, we developed this annular shape. It was discovered that the open state of the bottle can be easily detected by providing a means to confirm the opening operation on the finger ring.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a container lid that allows consumers to detect tampering with the touch of their hands even when it is difficult for consumers to visually check whether the container is unopened at night or the like.

[Means for solving problems]

A container lid capable of detecting an opening operation according to the present invention includes a circular plane part that covers a container opening, an annular skirt part that hangs down from an outer peripheral end of the circular plane part, and a ring-shaped skirt part that extends downward from one end of the skirt part. an ear extending outward, a tear strength deterioration line extending upward from the lower end of the skirt into a circular plane portion at both ends of the ear, and an annular finger ring at the tip of the ear. The tear-off type container lid is provided integrally or connected to each other, and is characterized in that a film is stretched over the ring hole of the finger ring.

In this case, the film stretched over the annular finger ring is made of a synthetic resin film such as polyethylene, polyvinyl chloride, polypropylene, etc., and is heat-sealed to the ring portion so that it can be broken by the finger.

Further, it is preferable that the film is provided with a weakening line for breaking.

[Effect]

According to the container lid of the present invention, the ring hole of the annular finger ring of the tear-type container lid is covered with a film that can be broken with a finger, so that the film is broken when the container is opened. If the state of breakage is confirmed, it is possible to easily detect that the ear portion has been opened.

〔Example〕

Next, embodiments of the container lid capable of detecting opening operation according to the present invention will be described in detail below with reference to the accompanying drawings.

1 and 2 show an embodiment of the container lid of the present invention, and the basic structure thereof is the same as the conventional container lid shown in FIG. Reference numerals are given and detailed explanations thereof are omitted.

In this embodiment, the container lid, except for the sealing liner, can be selectively and integrally constructed from materials such as aluminum alloy, tinplate, chromic acid treated steel, or synthetic resin. Further, a sealing liner (not shown) is provided on the inner surface of the container lid, that is, inside the circular plane part 10, along the boundary with the skirt part 12, and this sealing liner is made of vinyl chloride resin compound or polyethylene mold. It can be composed of a liner or the like. Therefore, in the container lid of this embodiment, a synthetic resin film 22 such as polyethylene, polyvinyl chloride, polypropylene, etc. is stretched over the entire ring hole of the annular finger ring 18, and the ring portion is bonded by heat-sealing means or the like. It is fixed.

However, in the present invention, when stretching the synthetic resin film 22 over the ring hole of the annular finger ring 18, for example, as shown in FIG. A tape-shaped film F of a predetermined width is supplied to the
Next, by pressing the film F onto the ring portion of the annular finger ring 18 using an appropriate pressure bonding means, the film is fused and fixed to the ring portion, and unnecessary outer peripheral portions can be thermally cut off.
Thereafter, as shown in FIG. 1, weakening lines 24 for breaking are engraved radially from the center of the film 22 stretched over the ring hole using a suitable press or the like. It can be configured so that the state of the opening operation can be easily detected when the cap is broken by a finger. Note that if the film is easy to break due to its properties or thickness, the breaking weakening line 24 may be omitted.

In addition, in the above-mentioned embodiment, the case where the breaking film was stretched on one side of the annular finger ring 18 was shown, but it is also possible to stretch it on both sides, and other shapes of the weakening line for breaking are possible. Of course, various modifications can be made to the above.

Alternatively, as a means for stretching the synthetic resin film 22 over the ring hole of the annular finger ring 18, a die adapted to the shape of the annular finger ring is provided, and a synthetic resin melt is extruded through the die to form a mold. It can also be molded. Furthermore, as shown in FIG. 8, it is also possible to mold the annular finger ring 18 itself onto the tip of the ear using a synthetic resin material. It can be manufactured easily by carrying out an integral molding process that covers the ring hole portion in the form of a film at the same time as the molding process.

〔Effect of the invention〕

As is clear from the embodiments described above, according to the present invention, in a tear-type container lid in which an annular finger ring for tearing is provided at the tip of a tear ear, a film that can be torn at the ring hole of the annular finger ring is provided. Since it is necessary to break the film with a finger when opening the cap, it is possible to easily confirm and detect the state in which the cap has been opened in the broken state of the film. Therefore, whether or not the cap has actually been opened can be determined by checking in detail the broken state of the tear strength deterioration line extending from both sides of the ear part to the skirt part in the next step.

Therefore, according to the present invention, a purchaser or the like can easily determine at a glance whether a container lid may have been opened, and can prevent sales of products equipped with this type of container lid. It can be done extremely safely. Further, since the container lid of the present invention can be incorporated into a part of the manufacturing process, it can be mass-produced at low cost.

Although the preferred embodiments of the present invention have been described above, it goes without saying that various design changes can be made without departing from the spirit of the present invention.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of a container lid capable of detecting an opening operation according to the present invention, FIG. 2 is a cross-sectional view of a main part of the annular finger ring shown in FIG. 1, and FIG. FIGS. 4 and 5 are side views showing different configuration examples of conventional pilfer-proof caps, FIG. 6 is a perspective view of a conventional tear-type container lid, and FIG. Figures a, b, and c are the 6th
FIG. 8 is a perspective view of a container lid to which the present invention can be applied, in which an annular finger ring is molded with a synthetic resin material. 10...Circular plane part, 12...Skirt part, 14...
Ear portion, 16... Tear strength deterioration line, 18... Annular finger ring, 20... Emboss, 22... Film, 24... Weakening line for breaking.

Claims (1)

[Scope of Claims] 1. A circular planar portion covering the container opening, an annular skirt portion extending downwardly from an outer peripheral end of the circular planar portion, and an ear extending outward from one end of the skirt portion. and a tear strength deterioration line extending upward from the lower end of the skirt into a circular plane part at both ends of the ear, and an annular finger ring integrally or connected to the tip of the ear. 1. A tear-off type container lid capable of detecting an opening operation, characterized in that a film is stretched over the ring hole of the annular finger ring. 2. In the container lid according to claim 1, the film stretched over the annular finger ring is made of a synthetic resin film such as polyethylene, polyvinyl chloride, polypropylene, etc., and is heat-sealed to the ring portion and can be broken with a finger. A container lid capable of detecting opening operation. 3. A container lid according to claim 1 or 2, in which the film stretched over the annular finger ring is provided with a weakened line for breaking, so that opening operation can be detected.