JPS5840062Y2 - Easy-open plastic container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plastic container that can be easily opened, and more particularly to a plastic container made of multilayer sheets.

Conventionally, plastic containers for food have been used as shown in FIGS. 1 and 2.

That is, a tongue portion 3' is formed on a part of the outer circumference of the flange portion 2', a cut 6' is formed on the lower surface of this tongue portion, and a lid member 8' made of aluminum foil or plastic film is attached to the flange portion 2'. ' is thermally bonded to the container on the entire circumferential surface and tongue to form a seal.

When opening the seal, the tongue 3' can be easily cut by folding it upward at the notch 6', and the seal can be removed by simply pulling it to the side (see Figures 3 to 3). (Figure 5) - Polystyrene is generally used as the plastic container body in terms of moldability and cost.

However, in recent years, with regard to food preservability, food containers have become increasingly required to have content protection properties, such as food resistance, impact resistance, ultraviolet light blocking properties, and gas barrier properties.

For this reason, it is difficult to meet this requirement with conventional single-layer polystyrene sheet containers; instead, adhesive multilayer containers made of polystyrene sheets and sheets of other resins, such as polyethylene, polypropylene, nylon, polyester, and EVAL, have become difficult to meet. It has become common practice to use sheets to form the main container.

In this case, the base resin polystyrene sheet is used to form the outer surface of the container.

However, when such a multilayer container is sealed as described above, it is often difficult to remove the lid material.

As mentioned above, the polystyrene part, which is the base resin of the sheet, can be easily cut by folding the cut, but the cutting of other component parts made of polyethylene, polypropylene, etc. depends on these hinge characteristics. This is because it is not easy because of the large size (Figure 6).

It is also known that the tongue of the container is configured to be lower than the flange, and when the lid is sealed, an unsealed portion is created between the lid and the tongue to make the container easier to open. If the container is very small and is not used for juice or jam, but for coffee milk, etc., as shown in Figure 8, the entire lid will be heated during heat sealing, and the tip will be glued during trimming, resulting in opening the container. It often happens that it becomes very difficult to do so.

The present invention was made to solve these problems.

The following will be explained based on the drawings. The present invention is a plastic container in which a tongue part 3 is formed on a part of the outer periphery of a flange part 2, and the tongue part is bent substantially diagonally downward, and the tongue part is further folded back in the middle to form a folded part 4. , and a cut 6 parallel to the fold line 5 is formed on the lower surface of the fold, and the lid 8 is bonded to the container at the entire circumferential surface of the flange 2 and the tip 7 of the fold 4. It is an easy-to-open plastic container featuring
Figure 9).

To unseal the container sealed in this way, as shown in FIG. Lid material 8 glued only in
can easily peel off due to the difference in elongation.

Since such a multilayer container usually has a large squeeze ratio, if the notch 6 is not provided, it cannot be easily folded downward.

To seal the container of the present invention, it is only necessary to first thermally bond the container flange portion 2 at 200° C. for about 1 second, as in the conventional method, and then trim the lid material within 1 to 2 seconds.

Heat sealing is performed using a cylindrical heater that is approximately the same size as the flange, but the tip of the lid material is also considerably heated due to radiant heat, conduction heat, etc., so when trimming the lid material, this cut surface is The blade presses and seals the tip of the folded portion.

In rare cases, the adhesive may not be attached at this tip, but in this case, the seal can be simply peeled off as before, so there is no problem in opening the package.

As described above, in the easy-open plastic container of the present invention, as shown in FIG. Regardless of whether the container is bonded to the container at two points on the entire circumference and at the tip 7 of the folded part 4, when opening the package, the folded part 4 must only be folded downward from the notch 6 as shown in Figure 10. This provides a remarkable effect in that the adhesive portion at the tip of the lid material can be easily peeled off due to the difference in elongation.

(It goes without saying that it is extremely easy to remove the cover material by peeling off the adhesive from the flange part from the state where the tip is peeled off as shown in Figure 10.) Note that the notch 6 in the present invention is different from the notch 6' in the prior art. It should be noted that they have completely different meanings in terms of effectiveness.

This is because the incision in the prior art as shown in FIG. 3 is such that the tongue 3' is cut upward from the notch by lifting the tongue 3' upward from the notch (FIGS. 4 and 5). In contrast, the notch 6 in the present invention is bent downward rather than upward as shown in FIG. This is because the purpose of the present invention, which is to provide ease of opening, can be effectively achieved.

Although the container of the present invention can of course be applied to single-layer containers, it is particularly effective when applied to multi-layer containers.

[Brief explanation of the drawing]

1 and 2 show a conventional plastic container, with FIG. 1 being a perspective view and FIG. 2 being a longitudinal sectional view. FIG. 3 is an enlarged sectional view of portion A in FIG. 2. FIGS. 4 and 5 are enlarged sectional views of main parts of a conventional container in an unsealed state. Figure 6 is an enlarged sectional view of the main parts of the multilayer container, Figures 7 and 8.
The figure is an enlarged sectional view of the main part of the unsealed part. FIGS. 9 and 10 show the container of the present invention, with FIG. 9 being an enlarged sectional view of the main part showing the sealed state and FIG. 10 showing the unsealed state. In the drawings, 1... Container, 2... Flange portion, 3... Tongue portion, 4... Folded portion, 5... Folded portion. Line, 6...notch, 7...tip of folded part, 8...
・Lid material, 9... Polystyrene layer, 10...
...adhesive layer, 11...polyethylene, polyph 0
A layer of lopyrene etc.

Claims (1)

[Scope of utility model registration request] 1. In a plastic container 1 in which a tongue portion 3 is formed on a part of the outer periphery of the flange portion 2, the tongue portion is bent substantially diagonally downward, and the tongue portion is further folded back in the middle to form a folded portion 4, and On the lower surface of the fold, there is a fold line 5.
An easy-to-open plastic container characterized in that a notch 6 is formed parallel to the flange portion 2, and a lid member 8 is adhered to the container on the entire circumferential surface of the flange portion 2 and at the tip 7 of the folded portion 4. 2. The plastic container according to claim 1, wherein the plastic container is a multilayer container.