JPH0232615Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a container made of plastic that has easy-openability and barrier properties.

BACKGROUND ART Conventionally, containers made of polystyrene resin have been known, such as Ultra Lock, which utilizes the fragility of polystyrene resin and has sealing properties and easy-to-open properties.

However, since polystyrene resin does not have barrier properties, conventional polystyrene resin containers have not been suitable for use as containers for containing contents (for example, miso, etc.) that may be denatured by air permeation.

On the other hand, plastic containers having barrier properties are also known, but it has been difficult to provide easy-opening properties due to material or structural factors.

This invention was made in view of the above, and
An object of the present invention is to provide a plastic container that has the easy-opening properties of a polystyrene resin container and also has barrier properties.

That is, in the present invention, a container body is formed of a multilayer sheet consisting of at least a polystyrene resin layer and a barrier layer, the container body has a sealing part for attaching and sealing a lid, and the sealing part is made of polystyrene resin. The gist of the present invention is a container having barrier properties characterized by being provided with a cut portion that does not reach the resin layer.

Embodiments of the present invention will be described below with reference to the drawings.

Multilayer sheet 2 used for container 1 according to the present invention
consists of at least a polystyrene resin layer 3 and a barrier layer 4. As the barrier resin used for the barrier layer 4, for example, saponified ethylene vinyl acetate copolymer, ionomer, polyolefin vinyl chloride/vinylidene chloride copolymer, etc. are used, but in particular saponified ethylene vinyl acetate copolymer is used with polystyrene resin. Excellent as a laminated sheet.

In addition to the above-mentioned resin layers, the multilayer sheet 2 can further have other resin layers laminated thereon as needed. For example, the multilayer sheet 2 may be constructed by further laminating a third layer 5 made of a polypropylene resin layer or a polystyrene resin layer on the barrier layer.

When using a multilayer sheet with this three-layer structure, the polystyrene resin layer 3 may be used as an inner layer of the container body as shown in FIG. 1, or as an outer layer of the container body as shown in FIG.

Since polystyrene resin deteriorates when it comes into contact with oils and fats, if the third layer 5 is formed of an oil-resistant resin such as polypropylene resin, nylon, or polyester, and this third layer is configured as the inner layer of the container body, it can contain oils and fats. Suitable for use as food containers.

A container having barrier properties according to the present invention can be obtained by molding the laminated sheet as described above by a conventional method such as vacuum forming or pressure forming.

The container 1 according to the present invention has a flange portion 6 as a sealing portion for heat sealing, and this edge 6
A notch 7 that does not reach the polystyrene resin layer 3 is provided. Then, the top surface of the flange portion 6 is heat-sealed to the lid 8 to achieve sealing. The lid 8 is made of, for example, a laminate of saponified ethylene vinyl acetate copolymer, polyolefin vinyl chloride vinylidene chloride copolymer, biaxially oriented polyvinyl alcohol, metal foil, etc. on a base film 11 made of polypropylene, polyester, etc. It is constructed by laminating a barrier layer 10, and further laminating a heat-sealing resin layer (for example, polystyrene) 9 on the barrier layer 10 for heat-sealing to the flange portion 6 of the container body, and has barrier properties. If so, there are no particular limitations. The heat-sealing resin layer 9 of the lid 8 is heat-sealed to the polystyrene resin layer 3 (FIG. 2) or the third layer 5 (FIG. 2) of the flange portion 6 of the container body, thereby sealing the container body 1 containing the contents. is sealed by a lid 8.

In addition, for convenience of explanation, the heat seal part is designated by the symbol 12.
It is shown with. It is not essential to provide the heat-sealing resin layer 9 on the lid, and heat-sealing may be performed using a separate inner seal.

However, if the heat-sealing resin layer 9 is provided on the lid 8 as in this embodiment, there is no need for heat-sealing with an inner seal, and heat-sealing can be performed directly with the lid material, which has the advantage of simplifying the sealing work.

When heat-sealing is performed, it is preferable that the heat-sealing portion 12 is located outside the notch portion 7.

In addition, as shown in FIG.
By providing a protruding portion 14 with a diameter that almost matches the opening of the container at the lower part, the lid can be fitted into the opening of the container even after the notch is folded and the container is opened. It can be a container with

The shape of the container according to the present invention is a cup-shaped container 1
The shape is not limited to, but various shapes such as a box shape, a dish shape, and others are possible.

When a product is sealed and heat-sealed in a container according to the present invention, it can be easily opened by the following simple actions.

For example, in FIG. 1, the end of the flange portion 6 is first lifted upward. Then, the polystyrene resin layer 3 is broken at the cut portion 7. Then, as shown in FIG. 4, the package is opened.

In this case, the notch part is the heat seal part 12
Since the lid 8 is located inside the container body 1, the lid 8 can be removed from the container body 1 only by breaking the polystyrene resin layer 3 of the container body.
Furthermore, since the barrier layer 4 has the cut portion 7, it does not become a hindrance when opening the package.

As explained above, since the container body of the present invention is formed of a multilayer sheet with a barrier layer, it is possible to prevent air from permeating, and it can be used as a container for storing foods that deteriorate or spoil due to oxidation. . Therefore, there is no need to use an inner bag with barrier properties.

In addition, since we have provided a notch in the sealing part of the container body that does not reach the polystyrene resin layer, the polystyrene resin layer can be easily folded by the notch, and even if a barrier layer is present, the notch will not reach the polystyrene resin layer. Therefore, the barrier layer can be cut, and there is no problem in opening the package.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; Fig. 1 is a vertical sectional view of the embodiment according to the invention, Figs. 2 and 3 are partial sectional views of other embodiments, and Fig. 4 is an unsealed one. FIG. 3 is a longitudinal cross-sectional view of the flange portion. DESCRIPTION OF SYMBOLS 1... Container body, 2... Multilayer sheet, 3... Polystyrene resin layer, 4... Barrier layer, 6... Sealing part, 7... Notch part.

Claims (1)

[Scope of utility model registration request] A container body is formed of a multilayer sheet consisting of at least a polystyrene resin layer and a barrier layer, and the container body has a sealing part for attaching and sealing a lid, and the polystyrene resin layer is reached to the sealing part. 1. A container having barrier properties, characterized in that the container is provided with a notch portion that does not prevent the water from forming.