JPH0318325Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Application This invention relates to a paper-based sealed container mainly containing beverages such as juice, other liquids, and granules.

BACKGROUND ART Metal cans have been commonly used as sealed containers. However, since metal cans cannot be incinerated, they are difficult to dispose of after use, resulting in so-called can pollution. Therefore, paper-based sealed containers have recently begun to appear. The paper-based sealed container includes a body wall and a bottom wall thereof. The trunk wall is formed by bending a sheet-like laminated material based on paper into a cylindrical shape and joining both ends thereof. On the other hand, the bottom wall is formed into a shallow cup shape and is fitted and fixed to the inner surface of the lower end of the body wall, and is made of aluminum, thermoplastic synthetic resin, or the same laminated material as the body wall. The material is known.

Problems to be solved by the invention It is desirable that the above-mentioned container satisfy the following conditions. First, the containers are cheap because they are disposable. For this purpose, it is necessary that the bottom wall including the trunk wall be made of inexpensive materials. Second, when fixing the bottom wall to the body wall during the container manufacturing process, this can be done reliably, and the container is convenient to handle during the container distribution process, and the contents can be easily taken out. The container must retain its shape. To this end, it is necessary to provide the bottom wall with appropriate rigidity as a whole, since rigidity cannot be expected from the body wall made of paper as the base material.

By the way, as mentioned above, in conventional containers,
Laminated materials based on aluminum, thermoplastic synthetic resin, or paper are used as the material for the bottom wall, but since each material is used individually, the above-mentioned problems will occur when using any of the materials. The problem is that each condition is not met. In other words, if aluminum is used as the material, aluminum is the best material for the bottom wall due to its rigidity, but it is expensive and requires large-scale equipment to form into a cup shape. shall be. Further, when the material is a thermoplastic resin, the thermoplastic resin has poor rigidity. In order to impart rigidity to thermoplastic resin, it is possible to make it thicker, but this increases the weight and increases the material cost, making it uneconomical. Furthermore, when the material is a laminated material whose base material is paper, it is difficult to form such a laminated material alone into a cup shape.

The purpose of this invention is to provide a paper-based sealed container that solves the above problems.

Means for Solving the Problems In order to achieve the above object, the paper-based sealed container according to this invention has a thermoplastic synthetic resin layer, a paper-based layer, an adhesive layer, an aluminum foil layer, a thermoplastic synthetic resin layer, and a thermoplastic synthetic resin layer in order from the outside. It is equipped with a body wall integrally constructed of a resin layer, a bottom wall having the same structure as the body wall, and an annular connecting frame made of thermoplastic synthetic resin that connects both walls. is provided with a horizontal inner edge fixed to the upper surface of the peripheral edge of the bottom wall, and on the outer periphery of the connecting frame there is a hanging part fixed to the inner surface of the lower end of the trunk wall, followed by a hanging part fixed to the inner surface of the lower end of the trunk wall. A horizontal outer edge abutting the lower surface of the wall is provided.

In the above, polyethylene is generally used as the thermoplastic synthetic resin because of its low cost and ease of lamination. A thermoplastic synthetic resin, particularly polyethylene, is also used for the adhesive layer, but any resin other than polyethylene may be used as long as it can reliably bond the aluminum foil and paper. Since the hanging portion of the connecting frame is fixed to the inner surface of the lower end of the trunk wall, it is sufficient for the horizontal outer edge of the connecting frame to simply contact the lower surface of the trunk wall, but it is of course possible to fix it. .

Embodiment An embodiment of this invention will be described below with reference to the drawings.

The paper-based sealed container includes a trunk wall 6 integrally composed of a polyethylene layer 1, a paper main layer 2, a polyethylene layer 3 as an adhesive layer, an aluminum foil layer 4, and a polyethylene layer 5 in order from the outside; A polyethylene annular connecting frame 10 that connects the trunk wall 6 and the top wall 7 and has an inward horizontal protrusion 9 with a knob as a part, and the trunk wall 6 and the bottom It includes a polyethylene annular connecting frame 11 connecting the walls 8.

On the inner periphery of the connecting frame 10 on the top wall 7 side, there are provided upper and lower horizontal inner edge portions 12 and 13 that are fixed to the top wall 7 across the peripheral edge thereof, and on the outer periphery of the connecting frame 10. , a rising portion 14 fixed to the inner surface of the upper end of the trunk wall 6, and a horizontal outer edge portion 15 subsequently abutting the upper surface of the trunk wall 6, and the inner horizontal protruding portion 9 with a knob is provided by forming a V-shaped groove 17 on the upper surface of an annular thin walled portion 16 having an oval contour for forming an opening, and a base portion 19 of a knob 18 having a finger hole 24 is formed on the pointed end of the annular thin walled portion 16. It is integrally provided inside and close to a part of the .

A horizontal inner edge 20 fixed to the upper surface of the peripheral edge of the bottom wall 8 is provided on the inner periphery of the connecting frame 11 on the bottom wall 8 side, and a horizontal inner edge 20 is provided on the outer periphery of the connecting frame 11.
A hanging portion 22 fixed to the inner surface of the lower end of the body, and a horizontal outer edge portion 2 that is subsequently brought into contact with the lower surface of the trunk wall 6.
3 are provided.

The top wall 7 and the connecting frame 10 are integrally molded at the same time, and the connecting frames 10 and 11 are fused to the trunk wall 6 by high frequency heating, and the lower connecting frame 11 is fused to the bottom wall 8 by high frequency heating. It is something that

The body wall 6 is made by bending a single laminate into a cylindrical shape, overlapping both ends, and fusing them together by high-frequency heating. Fig. 3 shows how the two ends are joined. ing. That is, a portion of the polyethylene layer 1 and the paper layer 2 at the inner end of the overlapped ends are removed, and the polyethylene layer, which is the adhesive layer exposed as a result of removal, is removed from the polyethylene layer at the outer end. It is fused to the inner polyethylene layer.

To open a sealed container, pull the knob 18 diagonally upwards toward the outside of the sealed container.
A force is applied to the base portion 19, and as shown by the chain line in FIG. 2, the fracture progresses from the inner end to the outer end of the thin wall portion 16, forming an opening.

Although not shown, when forming the trunk wall, the inner side of both overlapping ends is folded back.
The inner polyethylene layer may be fused to the inner polyethylene layer of the outer one, or the two ends may be overlapped as they are, and the inner polyethylene layer of the outer one and the outer polyethylene layer of the inner one may be fused, and A thermoplastic synthetic resin tape may be applied to cover the inner end surface.

Moreover, for the top wall, in addition to the one shown in the drawings, it is also possible to use a top wall that is mainly made of paper or a thermoplastic synthetic resin plate with a different structure.

Effects of the invention The paper-based sealed container according to this invention has a body wall integrally composed of a thermoplastic synthetic resin layer, a paper main layer, an adhesive layer, an aluminum foil layer, and a thermoplastic synthetic resin layer in order from the outside. It has a bottom wall with the same structure as the walls, and a ring-shaped connecting frame made of thermoplastic synthetic resin that connects both walls. No expensive aluminum is used, and the container is mostly paper-based. Since it is made of a laminated material, the cost will not increase and the weight will not increase.

In addition, the inner periphery of the connecting frame is provided with a horizontal inner edge that is fixed to the upper surface of the peripheral edge of the bottom wall, and the outer periphery of the connecting frame is provided with a horizontal inner edge that is fixed to the inner surface of the lower end of the trunk wall. Since the bottom wall, which is made of paper-based laminated material, is not stretchable and has a horizontal outer edge that is in contact with the lower surface of the body wall, Coupled with the fact that it is difficult to deform in the direction, the body wall, the bottom wall, and the connecting frame can be reliably fixed to each other, and the rigidity necessary for maintaining the shape of the container can be ensured.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention. Fig. 1 is a plan view with each layer partially removed from above, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Fig. 3 is a cross-sectional view taken along the - line in Fig. 1.
It is an enlarged sectional view taken along the - line in the figure. 1, 5...Thermoplastic synthetic resin layer (polyethylene layer), 2... Paper main layer, 3... Adhesive layer (polyethylene layer), 4... Aluminum foil layer, 6... Trunk wall, 8... Bottom Wall, 11... Annular connecting frame made of thermoplastic synthetic resin (annular connecting frame made of polyethylene), 20...
...Horizontal inner edge portion, 22...Drooping portion, 23...Horizontal outer edge portion.

Claims (1)

[Scope of utility model registration request] A trunk wall 6 integrally composed of a thermoplastic synthetic resin layer 1, a paper main layer 2, an adhesive layer 3, an aluminum foil layer 4, and a thermoplastic synthetic resin layer 5 in order from the outside.
, a bottom wall 8 having the same structure as the trunk wall 6, and an annular connecting frame 11 made of thermoplastic synthetic resin that connects both walls 6 and 8.
A bottom wall 8 is provided on the inner periphery of the connecting frame 11.
horizontal inner edge 2 fixed to the upper surface of the peripheral edge of
0 is provided on the outer periphery of the connecting frame 11, a hanging part 22 fixed to the inner surface of the lower end of the trunk wall 6, and a horizontal outer edge part 23 that is in contact with the lower surface of the trunk wall 6. A paper-based sealed container that is equipped with