JPS627559Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealed container, and more particularly to a sealed container in which a plastic cap having a pilfer-proof band is attached to the mouth of the container.

1 in FIG. 1 shows an example of a cap applied to the present invention, which is formed from thermoplastic plastic (for example, polyethylene, polypropylene, etc.) by integral molding such as injection molding, and has a skirt portion 2. It is equipped with a pilf-proof band 3 on the lower side. The pilfer-proof band 3 is connected to the lower end 2a of the skirt portion 2 via a plurality of narrow bridge portions 4 that are easy to cut, and one bridge portion 5 that is relatively wide and difficult to cut. There is. Further, the pilfer-proof band 3 is formed with a relatively thin breakable split portion 6 extending in the axial direction near the bridging portion 5. A threaded portion 7 is formed on the inner surface of the skirt portion 2.

After screwing such a cap 1 into the mouth of a container (for example, a glass bottle), the pilfer-proof band 3 is heated and softened by hot air blowing or infrared irradiation, and the cap 1 is heated and softened under the threaded part of the mouth. The container is sealed by heat shrinking the sides of the annular bead and the jaws extending generally radially inward from the lower ends of the sides. When the screw is unscrewed for opening, the split portion 6 is broken together with the bridge portion 4, the engagement between the pilfer-proof band 3 and the jaw portion is released, and the bridge portion 5 is connected to the skirt portion 2. It is desirable from the viewpoint of reusing the used container that the pilfer-proof band 3 is removed from the container mouth together with the skirt portion 2.

However, since the conventional annular bead part has a circular outer periphery, the breakage of the split part 6 and the bridge part 4 is mainly due to the upward tensile force in the axial direction as the skirt part 2 rises during unscrewing. This was due to torsional force due to frictional resistance between the pilfu-proof band 3 and the jaw.

Therefore, in cases where the engagement width of the pilfer-proof band 3 with the jaws is narrow, the twisting force is insufficient, and the bridge portion 4 and the split portion 6 are opened without breaking, resulting in a pilfer-proof property. There was a risk that a problem would arise in which the data would be lost.

In the present invention, a threaded cap made of thermoplastic plastic is provided with a relatively wide pilfer-proof band on the underside of the skirt portion and connected to the skirt portion through at least a plurality of easy-to-cut bridge portions. Even if the width of engagement between the pilf-proof band and the jaws of the container opening is narrow, the bridge part will surely break when the container is opened, ensuring pilf-proof properties. The main purpose is to provide a hermetically sealed container.

Furthermore, the present invention provides a bridging portion that connects the skirt portion and the pilfu-proof band, and a portion of the pilfu-proof band near the bridging portion.
It is a particular object of the present invention to provide a sealed container of the type described above, which has a structure in which, if a breakable split portion extending in the axial direction is formed, the split portion is easily broken when the container is opened.

In the present invention, a threaded cap made of thermoplastic plastic is provided with a relatively wide pilfer-proof band on the underside of the skirt portion and connected to the skirt portion through at least a plurality of easy-to-cut bridge portions. In the sealed container that is attached to the container, the pilfer-proof band is in close contact with the side and jaw portion of the annular bead portion having a corner portion on the side portion of the container mouth portion through thermal deformation. The present invention provides a sealed container characterized by:

In addition to the bridge part, a bridge part that connects the skirt part and the pilfu-proof band and is difficult to break is provided, and the pilfu-proof band has a split part that can be broken, preferably in the vicinity of the bridge part. Preferably.

The present invention will be described below with reference to the drawings which are examples.

Reference numeral 10 in FIGS. 2 and 3 shows an example of the container mouth part applied to the present invention, 11 is a threaded part, and 12 is an annular bead part. Annular bead part 1
2, the side portion 12a is a regular polygon (in this case, a regular dodecagon). The annular bead portion 12 is formed at a position facing the upper portion 3a of the pilfer-proof band 3 when the cap 1 is completely screwed into the container mouth portion 10, and
2a ₁ (which may be rounded in the circumferential direction) is dimensioned so that it substantially contacts the inner surface of the upper portion 3a.

The difference between the radius r of the inner surface of the pilfer-proof band 3 (substantially equal to the radius r' of the circumscribed circle of the side part 12a of the annular bead part 12) and the radius h of the inscribed circle of the side part 12a (r-h ), i.e., the inner surface and side portion 12
It is desirable that the maximum distance between a and a is smaller than about 1.5 mm in order to ensure close contact of the pilfer-proof band 3 to the side 12a of the annular bead portion 12 due to thermal deformation, which will be described later.

After screwing the cap 1 into the container mouth 10, blow hot air onto the pilfer-proof band 13, or
Alternatively, the pilfer-proof band 3 is heated and softened by irradiation with infrared rays. At that time, the pilfer-proof band 3 is heat-shrinked, and as shown in FIGS.
As shown in the figure, the side portion 12a of the annular bead portion 12
and in close contact with the jaw portion 12b. In this specification, the term "close contact" includes a case where the lower ends 3b of the pilfer-proof band 3 are slightly apart as shown in FIG.

The container sealed as described above is opened by unscrewing the cap 1. At that time, the split portion 6 is easily broken. When the cap 1 is rotated when the cap is opened, (a) the polygonal pilfer-proof band portion that was in close contact with the side portion 12a tends to be expanded to nearly the circumference of the circumscribed circle of the side portion 12a; As the portion that was in close contact with the jaw portion 12b is also pushed apart as the cap 1 rises, these pushing and spreading forces act on (b) the side portion 1;
2a has a polygonal shape and the corner portion 12a ₁ exists, so the pilfer-proof band 3 has difficulty sliding, and a torsional force acts on the pilfer-proof band 3, and (c) a tensile force upward in the axial direction. This is because

Furthermore, the torsional force (b) and the tensile force (c) act on the bridge portion 4, so that the bridge portion 4 is also easily broken. FIG. 6 shows the cap 1 removed from the container opening 10 as described above, and as is clear from the parts 6' and 4', the split part 6 and the bridge part 4 are When broken, the pilfer-proof band 3 is connected to the skirt part 2 only by the bridge part 5.

The above pushing and spreading force becomes smaller as the number of sides of the regular polygon increases. This is because the difference between the circumferential length of the circumscribed circle and the circumferential length of the regular polygon becomes smaller. Therefore, it is desirable that the number of sides of the regular polygon be as small as possible within the range that allows close contact due to thermal deformation.

The present invention is not limited to the above embodiments, and the side portions of the annular bead portion may have a scalene polygonal shape. Alternatively, it may be an irregular polygon consisting of arcuate portions and straight portions, although the effect is reduced. Furthermore, in the latter case, there may be one straight portion (in this case, there will be two corner portions). Furthermore, the split portion 6 does not necessarily have to be formed.

In the sealed container of the present invention, since the pilph-proof band is in close contact with the annular bead portion having a corner portion on the outer periphery, the bridge portion is easily broken when the container is opened, so there is no risk of losing the pilf-proof property. This effect can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of an example of a cap applied to the present invention, Fig. 2 is a front view of an example of a container opening applied to the invention, and Fig. 3 is a front view of an example of the container opening of Fig. 2. The plan view of Fig. 4 is shown in Fig. 2 by means of the cap of Fig.
FIG. 5 is a partially cutaway front view showing the container opening in a sealed state; FIG. 5 is a cross-sectional view taken along the - line in FIG. 4;
FIG. 6 is a front view showing the state of the cap shown in FIG. 4 after being removed from the container opening. 1...Cap, 2...Skirt part, 3...Pilf-proof band, 4...Bridge part, 5...
...Bridging part, 6... Split part, 10... Container opening, 12... Annular bead, 12a... Side part, 12
a ₁ ... Corner part, 12b ... Jaw part.

Claims (1)

[Claims for Utility Model Registration] (1) A thermoplastic plastic having a relatively wide pilfer-proof band on the underside of the skirt portion, which is connected to the skirt portion through at least a plurality of easy-to-cut bridge portions. In a sealed container in which a threaded cap made of A hermetically sealed container characterized by its close contact due to thermal deformation. (2) Utility model registration claim 1, wherein a breakable split portion is formed on the pilfer-proof band connected to the skirt portion via the bridge portion and the bridge portion that is difficult to break. sealed container.