JPS5855073B2 - Container sealing mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealing mechanism for a container, and particularly to a sealing mechanism for a container filled with a liquid beverage or the like and sold on the market.

Recently, liquid beverages such as milk and juice are often sold in paper containers.

In line with the above-mentioned trend, paper containers of various shapes have been considered and are no longer used.

Since these containers are discarded after being used, they need to be as simple as possible in structure, and even if the lid covers the container, the liquid beverage that is filled in the container will not leak out, and the container cannot be opened. Conventionally, the container shown in FIG. 1a has been used because the structure must be simple. In the figure, reference numeral 1 designates the container, and the interior thereof is filled with a liquid beverage or the like (not shown).

Reference numeral 2 denotes a lid that covers the opening of the container, and generally aluminum foil is used.

The specific sealing means seen from the X-Y cross section shown in FIG. 1A has various modifications as schematically shown in FIG.

However, no matter which sealing means is adopted, the structure must be such that the aluminum foil as the lid body 2 can easily adhere to the periphery of the open part of the container 1, and therefore the aluminum foil must be heat-fused to the bottom surface of the aluminum foil. Adhesive wax is applied and adhered to the periphery of the opening of the container.

However, as a practical matter, it is impossible to apply wax only to the periphery of the opening of the container, and it is inevitable that the remaining part will be exposed to the liquid beverage side. There is a risk that substances that are undesirable from a food hygiene perspective will leach out.

To prevent this, polyethylene is applied to the entire bottom surface of the aluminum foil.
A configuration in which a sheet is pasted and fused to the opening of the container via the polyethylene sheet is conceivable, but in this case, the adhesive strength is too strong and the entire surface cannot be opened easily, and other opening methods are required. must be added.

The present invention was made with the aim of solving the above-mentioned problem, and a polyethylene sheet with a width that can cover the periphery of the opening of the container is heat-fused on the lower surface of the aluminum foil that forms the upper surface of the lid. It is an object of the present invention to provide a container sealing mechanism in which the lid body having the overlapping structure is adhered to the periphery of the opening of the container using polyethylene or a sheet.

Examples will be described below with reference to the drawings.

FIG. 2 is a partial sectional view showing the sealing mechanism of the container according to the present invention, FIG. 3 is an exploded structural view of the lid, and FIG. 4 is a partial sectional view showing the container in an unsealed state.

Reference numerals 1 and 2 in FIG. 2 correspond to those in FIG.

Reference numeral 3 denotes an aluminum foil forming the upper surface of the lid body 2, and has a shape and size that covers the container opening periphery 4 and a part of the margin protrudes from the opening periphery 4.

Reference numeral 5 denotes a wax coating layer applied to the lower surface of the aluminum foil, which has thermal adhesive properties.

It is also possible to replace the wax coating layer 5 with paper impregnated with wax.

Reference numeral 6 denotes a polyethylene sheet, which is integrally attached to the aluminum foil forming the upper surface of the lid body 2.

The polyethylene sheet 6a has a concentric circular shape with respect to the opening periphery 4 of the container 1 (see FIG. 3).

Next, the unsealing of the container will be explained with reference to FIG. 4. As is clear from FIG.
Peeling occurs between the polyethylene sheet 6 and the wax coating layer 5, and at the same time, the polyethylene sheet 6 tears at positions 7a and 7b on both edges of the adhesive surface that is attached to the opening of the container 1, so that the tear line 7a.

7b expands along the entire circumference of the container opening until the entire surface is opened.

As can be understood from the above explanation, by directly pasting the polyethylene sheet 6 without providing the wax coating layer 5 in the central part of the aluminum foil 3 as shown in FIG.
In the center part of the lid body 2, aluminum foil 3 and polyethylene,
The adhesive force with the sheet 6 becomes stronger, and when the polyethylene sheet 6 is opened as shown in FIG. A clearer opening can be obtained than in the case of .

FIG. 6 shows a polyethylene sheet 6 placed around the opening of the container 1 in order to clean the periphery 4 of the container opening without forming a tear line 7a that occurs on the outside of the adhesive surface of the opening when the container is opened in the manner shown in FIG. This is an example in which the dimensions are such that the arrangement source is located inside the peripheral edge 4.

As explained above, the present invention applies heat-fusible wax to the lower surface of the aluminum foil that forms the upper surface of the lid, and also adheres a polyethylene sheet that matches the opening of the container to form an overlapping structure. Since the wax is attached to the periphery of the container, the wax does not come into contact with the liquid beverage or the like filled in the container, and the sealed opening can be opened efficiently.

[Brief explanation of drawings]

Figure 1 shows the sealing mechanism of conventional containers 1-1
Figure a is a perspective view showing the overall shape. c and d are cross-sectional views schematically showing the sealing means, FIG. 2 is a partial cross-sectional view showing the sealing mechanism of the container according to the present invention, FIG. 3 is an exploded view of the lid body used in the present invention, and FIG. The figure is a partial sectional view showing the container in an unsealed state, and FIGS. 5 and 6 are partial sectional views showing other embodiments of the container sealing mechanism according to the present invention. In the figure, 1 is a container, 2 is a lid, 3 is aluminum foil, 4 is the opening periphery of the container, 5 is a wax coating layer, 6 is polyethylene,
Seat? a, 7 b c rupture m.

Claims (1)

[Claims] 1 Press the sealing mechanism of the container 1 for sealing the opening of the container 1 using the lid 2, and the lid 2 contacts the aluminum foil 3 forming the upper surface and the lower surface of the aluminum foil 3. A sealing mechanism for a container, characterized in that a polyethylene sheet 6 is adhered via a layer containing heat-fusible wax.