JPS5834049Y2 - Opening structure of sealed container - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an opening structure for a waterproof/moisture-proof sealed container mainly made of paperboard for storing liquids, powders, etc.

Conventionally, when opening this type of sealed container, either a part of the container is destroyed and the container is opened, or a spout is drilled into the wall of the container and the spout is sealed with waterproof material before opening. In such cases, a method is used in which the sealed waterproof material is removed and the spout is opened.

In particular, the latter method is widely used because the desired spout cannot be obtained after opening the package, and its typical structure is
As shown in FIG. 4, a spout 2 is provided in a wall plate 1 having a thermoplastic resin layer 3 on the inner surface, and this is inserted into the thermoplastic resin layer 3 of the wall plate 1 as shown in the sectional view of FIG. A thermoplastic resin film 4 is heat-sealed via the resin layer 3 to seal the spout 2 from inside the wall plate, and a peel-off piece 6 having the same thermoplastic resin layer 5 is also removed from the upper part of the wall plate 1. The spout 2 is covered with the spout 2, and the thermoplastic resin film 4 and the thermoplastic resin layer 5 are thermally fused at the spout 2.

Next, when opening this, the peel-off piece 6 is peeled off from the wall plate 1 as shown in FIGS. The resin layer 5 breaks along the circumference of the spout 2, and the spout 2 opens.

However, in this conventional example, the thermoplastic resin film 4 often does not break along the circumference of the spout 2, but breaks the wall board 1 together, or the thermoplastic resin film 4 is left behind inside the spout 2. There were drawbacks such as the formation of parts.

This may cause discomfort when placing the mouth directly on the spout 2 for drinking, and there is a risk of cutting the lips especially when metal foil is used for the wall plate 1.

Therefore, the present inventor first attempted to improve the drawbacks of the conventional example by limiting the shape of the spout 2 to a specific shape so that the thermoplastic resin film 4 could be completely broken along the periphery of the spout 2. (Utility Application No. 53-148344).

The present invention is a further improvement of the previously proposed invention in Utility Application No. 148344/1983, and by using a metal foil such as aluminum instead of paperboard for the wall plate in which the spout 2 is bored, The spout 2 can be freely shaped and can be opened completely.

Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

Fig. 5 shows a truncated cone-shaped sealed container in which the present invention has been applied, where 1' is a lid wall plate forming the lid, 2 is a spout, and 7 is a body wall plate forming a body. .

FIG. 6 is a sectional view showing the opening structure according to the present invention, in which a desired spout 2 is bored in a lid wall plate 1' made of metal foil such as aluminum and has a thermoplastic resin layer 3 on the back side, and the surrounding area thereof. Fold the ends inward.

This folding operation is performed by utilizing the stretch of the metal foil and the thermoplastic resin layer 3.

Next, a thermoplastic resin film 4 is placed below the spout 2, and a peel-off piece 6 having a thermoplastic resin layer 5 is placed above the spout 2.

Note that the peel-off piece 6 may be made of any material such as paperboard, metal foil, or synthetic resin film.

In this way, when this is thermocompression bonded from above and below, the thermoplastic resin film 4 becomes a thermoplastic resin layer 5 at the spout 2.
The other portions are thermally fused to the thermoplastic resin layer 3.

Further, the overlapping thermoplastic resin layers 3, 3 are thermally fused at the folded portion around the spout 2.

In this way, the spout 2 is sealed by the thermoplastic resin film 4, and the cross section of the folded metal foil is also covered with the thermoplastic resin film 4 so that it does not come into contact with the stored liquid.

FIG. 7 shows a state in which the lid wall plate 1' having the opening structure constructed as described above is attached to the top opening of the truncated conical sealed container.

Note that numerals 8 and 9 both indicate waterproof material layers, and the cover wall plate 1' may be attached by heat sealing or a hot melt type adhesive may be used.

It goes without saying that the bottom of the container can be sealed using well-known techniques.

Next, FIG. 8 shows the opening state, and in the opening operation, when the end of the peel-off piece 6 is peeled off from the cover wall plate 1' and pulled strongly upward, the thermoplastic resin film 4 is removed from the folded cover wall plate. It is broken at the end edge 1', that is, the part indicated by α, and a completely open state is obtained.

This means that the parts of the thermoplastic resin layer 5 and the thermoplastic resin film 4 that are in direct contact with the lid wall plate 1' are not in a heat-sealed state but simply in a heat-compression bonded state; Peeling off the end portion is extremely easy, and the thermoplastic resin film 4 that is pulled together with the peeling piece 6 is broken mainly at the portion indicated by the symbol α.

Furthermore, since the area around the spout 2 is double folded, there is no possibility that the lid wall plate 1' will be torn directly.

Further, the thermoplastic resin layer 5 and the cover wall plate 1' can be bonded very weakly by heat sealing, adhesive, or the like.

It goes without saying that the opening structure according to the present invention can also be applied to the trunk wall board and the bottom wall board other than the lid wall board assembly.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the conventional type, Fig. 2 is a partially omitted cross-sectional view taken along line A-A, same as above, Fig. 3 is a perspective view showing the middle of the opening of the same < conventional type, and Fig. 4 is B-B same as above. 5 is a sectional view with some lines omitted; FIG. 5 is a perspective view showing an embodiment of the sealed container according to the present invention; FIG.
The figure is an explanatory cross-sectional view showing the structure of the present invention, FIG. 7 is a cross-sectional view of a main part showing an embodiment of the present invention, and FIG. 8 is a cross-sectional view of a main part showing an open state of the same. 1...Wall plate, 1'...Lid wall plate, 2...
... Outlet, 3 ... Thermoplastic resin layer, 4.
... Thermoplastic resin film, 5 ... Thermoplastic resin layer, 6 ... Peel-off piece, 7 ...
- Torso wall board.

Claims (1)

[Scope of utility model registration request] In a sealed container for storing liquids, powders, etc., at least one wall plate constituting the wall of the sealed container is made of metal foil such as aluminum having a thermoplastic resin layer 3 on the inner surface, and the wall plate is A desired pouring spout 2 is bored, the peripheral edge thereof is folded inward, and the overlapping thermoplastic resin layers 3 are thermally fused, and a thermoplastic resin film 4 is attached to the inner surface of the wall board. The spout 2 is sealed by heat-sealing it through the spout 3, and a tear-off piece 6 having a thermoplastic resin layer 5 below is placed above the spout 2 from the outer surface of the wall board. The opening structure of a sealed container is characterized in that the thermoplastic resin film 4 and the thermoplastic resin layer 5 of the peel-off piece 6 are thermally fused.