JP7036422B2 - The side wall surface structure of the packaging container and the packaging container having the structure. - Google Patents

Description

The present invention relates to a structure of a side wall surface portion of a packaging container made of a thermoplastic resin sheet and capable of containing foodstuffs and the like.

Bento containers made of thermoplastic resin sheets are often used in bento boxes sold at retail stores such as convenience stores. Various shapes of bento containers are used. For example, it is preferable to provide a side wall surface around the bottom surface to use the inside as an accommodating portion and partition the accommodating portion by a partition wall (partition). It is used.

The side wall surface portion of such a packaging container may not be simply formed of a flat plate, but may be shaped such as by providing irregularities on the surface.

For example, parallel ridges or grooves may be provided on the bottom surface portion or the side wall surface portion of the container. This is done from the viewpoint of reinforcing the container and increasing the rigidity (see, for example, Patent Documents 1 to 4 below). In recent years, containers have been made thinner in order to save resources. However, when the thickness of the container is reduced, the rigidity of the container is lost, and the container is easily deformed when the container is gripped or lifted. Therefore, by providing parallel ridges or grooves on the bottom surface portion or the side wall surface portion of the container, it is possible to increase the rigidity while being thin.

In addition to that, convex or concave grooves are provided in the circumferential direction of the side wall surface to make it easier to pick the container, and the side wall surface is projected inside the container to make it difficult for the contents in the container to roll. (See Patent Documents 5 and 6 below).

Japanese Unexamined Patent Publication No. 2011-73725 Japanese Unexamined Patent Publication No. 2013-237467 Japanese Unexamined Patent Publication No. 2014-108820 Japanese Unexamined Patent Publication No. 2014-184983 Japanese Unexamined Patent Publication No. 2002-362568 Japanese Unexamined Patent Publication No. 2017-171391

As described above, in a conventional packaging container, a convex or concave groove may be provided on the bottom surface or the side wall surface to form a shape, but this is mainly from a practical point of view such as increasing the rigidity of the container. It was provided, and it could not be said that it was considered to enhance the aesthetics of the container.

Therefore, an object of the present invention is to increase the rigidity of the container while enhancing the aesthetic appearance in the structure of the side wall surface of the packaging container made of a thermoplastic resin sheet, and further, for packaging in which the partition portion is not easily deformed. It is to provide the side wall surface structure of a container.

The side wall surface structure of the packaging container according to the embodiment of the present invention is a side wall surface structure of the packaging container, which is made of a thermoplastic resin sheet and has a side wall surface at the edge of the bottom surface, and partitions the inside of the container. , A partition portion connected to the side wall surface portion was provided, and the side wall surface portion was provided with a stepped portion in which each step was horizontally extended, and at least one step of the stepped portion was bulged inside the container like a tongue piece. It is characterized in that the bulging step portion having a portion is formed, and the side end portion of one step of the stepped portion is extended so as to enter into the side surface portion of the partition portion. Further, it is preferable that at least one step of the stepped portion is a bulging stepped portion having a portion that bulges like a tongue piece inside the container.

In this way, by providing a stepped step portion on the side wall surface portion and further forming at least one step of the stepped portion into a bulging step portion that bulges like a tongue piece, the rigidity of the container is increased and the container is lifted. Can be made into a container that is not easily deformed. Further, by forming the bulging step portion into a curved shape that swells inside the container, the container can be made into an aesthetically pleasing container. Since the bulging stage has a shape that swells inside the container, the space for the container's storage is narrowed, and it is difficult to create a gap between the container's storage such as food and the side wall surface, which makes the presentation look good. It also has the advantage of being able to improve.

In the side wall surface structure of the packaging container of the above-mentioned form, a plurality of steps of the stepped portion can be formed as a bulging step portion. By doing so, the rigidity of the container can be further increased.

The side wall surface structure of the packaging container of the above-mentioned form has a plan-viewing arch shape in which the bulging step portion bulges in the middle of the length direction in the shape of a tongue piece inside the container, or the bulging step portion bulges in the shape of a tongue piece inside the container. It is possible to form a plurality of projected portions along the length direction into a planar visual wave shape. By doing so, it is possible to produce an unprecedented aesthetic appearance of a container that uses many curves.

In the side wall surface structure of the packaging container of the above-described form, the end portion of the partition portion protruding upward from the bottom surface portion can be connected to the bulging step portion. By doing so, it is possible to increase the joint strength of the connecting portion between the side wall surface portion and the partition portion and make it difficult for the partition portion to be deformed.

An embodiment of the side wall surface structure of the packaging container of the present invention is shown, (A) is a plan view, and (B) is a sectional view taken along the line AA. It is a perspective view schematically showing the side wall surface structure of the packaging container shown in FIG. 1. It is a perspective view which showed an example of the packaging container to which the side wall surface structure of the packaging container shown in FIG. 1 was applied. It is a top view which showed the other example of the packaging container to which the side wall surface structure of the packaging container shown in FIG. 1 was applied. It is a top view which showed the other example of the packaging container to which the side wall surface structure of the packaging container shown in FIG. 1 was applied. It is a top view which showed the other example of the packaging container to which the side wall surface structure of the packaging container shown in FIG. 1 was applied. It is a schematic perspective view which showed the modification of the side wall surface part structure of the packaging container shown in FIG. 1. In the packaging container shown in FIG. 3, it is a partially enlarged perspective view with a cross section in the vicinity of the stepped portion. Another embodiment of the side wall surface structure of the packaging container of the present invention is shown, (A) is a plan view, (B) is a sectional view taken along line BB, and (C) is a sectional view taken along line CC. It is a top view which showed the other embodiment of the side wall surface structure of the packaging container of this invention.

Hereinafter, an embodiment of the side wall surface structure of the packaging container of the present invention will be described with reference to the drawings.

As shown in FIG. 1 or 2, the side wall surface structure 1 of the packaging container according to the embodiment of the present invention has a stepped portion 3 in which the side wall surface portion 2 is stepped, and at least one step of the stepped portion 3. The container is provided with a bulging step portion 4 having a portion that bulges like a tongue piece inside the container.

3 to 6 show each packaging container 5, 51, 52, 53 using the side wall surface structure 1.
Hereinafter, the side wall surface structure 1 will be described based on the packaging container 5 shown in FIG.
The packaging container 5 is provided with a side wall surface portion 2 on the edge portion of the bottom surface portion 6, and the inside thereof is used as an accommodating portion 7.

The packaging container 5 is not particularly limited, but it is preferable to store and package foodstuffs such as prepared foods, cooked rice, and noodles in the storage unit 7, and in particular, the storage unit 7 is partitioned by a partition unit 8 and a plurality of containers are used. It is preferable to use a bento container that can accommodate the foodstuffs of.
The packaging container 5 has a square shape in a plan view, but is not limited to this, and is not limited to, for example, a rectangular shape in a plan view such as a rectangular shape in a plane view, a circular or oval shape in a plan view, a pentagonal shape in a plan view, and a flat surface. It can also be a plan-view polygonal shape such as a hexagonal shape or an octagonal shape. Further, the packaging container 5 may be colored such as black or white, or may be transparent or translucent.

The packaging container 5 can be manufactured, for example, by thermoforming a synthetic resin sheet having a sheet thickness of 0.1 mm to 3 mm, preferably 0.2 mm to 2 mm.

The synthetic resin sheet is not particularly limited, but may be either a foamed resin sheet or a non-foamed resin sheet. For example, a polyolefin resin sheet such as a polyethylene resin sheet or a polypropylene resin sheet, a polystyrene resin sheet, or the like. Examples thereof include thermoplastic resin sheets such as polyester resin sheets such as polyethylene terephthalate resin sheets and modified polyethylene terephthalate resin sheets imparted with heat resistance. Among them, those that can withstand the heating of a microwave oven, for example, a heat-resistant polystyrene-based resin sheet, a polypropylene-based resin sheet, and a modified polyethylene terephthalate-based resin sheet imparted with heat resistance are preferable.
Further, a laminated sheet can be used as the synthetic resin sheet, and examples of the laminated sheet include a laminated sheet obtained by thermally laminating a film on a synthetic resin sheet, a laminated sheet by a coextrusion method, and a laminated sheet by an extrusion laminating method. Can be done.

Examples of the thermoforming include vacuum forming, compressed air forming, vacuum forming and hot plate forming.

As shown in FIG. 3 or 8, the packaging container 5 has a square-shaped bottom surface portion 6 in a plan view and a side wall surface portion 2 that rises in an inclined manner while expanding upward on the entire circumference of the edge portion of the bottom surface portion 6. And an accommodating portion 7 surrounded by a bottom surface portion 6 and a side wall surface portion 2.

The bottom surface portion 6 is designed so that an container such as food can be placed on it, and is formed as a substantially horizontal plane having a square shape in a plan view. In this example, the bottom surface portion 2 is a substantially horizontal plane, but the present invention is not limited to this, and may be, for example, an inclined surface shape or a mountain shape.
Further, the bottom surface portion 6 is formed with a partition portion 8 projecting upward, and the accommodating portion 7 is divided into a plurality of portions. In this example, curved partition portions 8a and 8b are provided in the vicinity of the opposite corners to form an elliptical accommodating portion 7a and 7b in a plan view, and a linear partition portion is formed on a diagonal line connecting the corner portions. 8c is provided to form accommodating portions 7c and 7d in which the accommodating portion 7 is substantially bisected.

Convex portions 6a having a trapezoidal cross section are formed in parallel on the bottom surface portion 6 of the accommodating portion 7c so that the accommodating contents do not slip easily. Further, on the bottom surface portion 6 of the accommodating portion 7d, a deformed rhombus-shaped concave groove portion 6b is formed along the side wall surface portion 2 and the partition portion 8 surrounding the accommodating portion 7d, and moisture exuded when food is stored, etc. It is made possible to store.
It should be noted that, in the vicinity of the four corners of the bottom surface portion 6, leg portions 6c having a shape-shaped recess in a plan view are formed.

As shown in FIGS. 1, 3 or 8, the side wall surface portion 2 surrounds the periphery of the bottom surface portion 6 and is provided so as to expand upward in an inclined manner, and a horizontal flange is provided on the upper edge portion. The portion 21 is formed. Further, a skirt portion 22 that is inclined or hangs downward is formed at the outer end portion of the flange portion 21. The skirt portion 22 may be formed so that a lid portion (not shown) is engaged with the end portion to allow so-called outer fitting.

The side wall surface portion 2 is provided with a stepped portion 3 having a stepped shape between the bottom surface portion 6 and the flange portion 21, so that the rigidity of the side wall surface portion 2 is increased and the rigidity of the packaging container 5 is increased. be.

As shown in FIG. 1 (B), the stepped portion 3 is formed by repeating a rising surface 3a that rises vertically or in an inclined manner and a flat surface portion 3b that extends in a substantially horizontal plane. The rising surface 3a and the flat surface portion 3b may be formed in a curved surface shape.
The stepped portion 3 is not particularly limited, but is preferably 1 to 10 steps, particularly preferably 2 to 8 steps, and further preferably 3 to 6 steps. In this embodiment, as shown in FIG. 1 (B), there are five stages.

The stepped portion 3 may be provided over the entire length of the side wall surface portion 2 or may be provided in a part thereof.
The height of each step of the stepped portion 3 (dimension X in FIG. 1B) is not particularly limited, but is preferably 1 mm to 10 mm in the vertical direction, and particularly preferably 2 mm to 5 mm. The height of each step may be the same or different.

As shown in FIG. 1A, at least one step of the stepped portion 3 is a bulging stepped portion 4 having a portion bulged like a tongue piece inside the container 5, thereby further increasing the rigidity. be able to. At least one step of the stepped portion 3 may be a bulging step portion 4, but it is preferable that a plurality of steps are bulging step portions 4, and it is particularly preferable that all steps are bulging step portions 4. In the present embodiment, as shown in FIG. 1A, the bulging step portion 4 is the first to third steps counted from the bottom surface portion 6.

In the present embodiment, the bulging step portion 4 is formed in a gently curved planar view bow shape (arc shape) in which the vicinity of the middle in the length direction is bulged in the shape of a tongue piece, but the present invention is limited to this. As shown in FIG. 7, it is also possible to form a planar visual wave shape in which a plurality of tongue piece-shaped bulging portions repeat in the length direction with respect to the stepped portion 3.

The maximum protruding width (dimension Y in FIG. 1A) of the bulging step portion 4 is not particularly limited, but is preferably 0.5 mm to 10 mm, and particularly preferably 1 mm to 5 mm. When a plurality of stages are used as the bulging step portion 4, the protruding width of the bulging step portion 4 may be different in each step. For example, the output width can be reduced toward the upper row.

As described above, in the packaging container 5 using the side wall surface portion structure 1, the side wall surface portion 2 is provided with a stepped portion 3 and at least one step of the stepped portion 3 is a bulging step portion 4. The rigidity is increased, and the rigidity of the packaging container 5 is increased, so that the container can be made into a container that does not easily bend even when lifted.
Further, by forming the bulging step portion 4 into a curved shape such as a plan view bow shape swelling inside the container, the container can be made into a container having an unprecedented aesthetic appearance.
Further, since the bulging step portion 4 has a shape that bulges inside the container, the space of the accommodating portion of the packaging container 5 is narrowed. Therefore, if the amount of food or the like is the same, the packaging container 5 is less likely to have a gap between the container and the side wall surface portion 2 as compared with the conventional container, and the appearance of serving is improved. Can be done.

9 shows a side wall surface structure 11 of a packaging container according to another embodiment of the present invention, and FIGS. 3 to 6 show each packaging container 5, 51, 52 using the side wall surface structure 11. , 53 are shown.
The side wall surface portion structure 11 has a configuration in which the end portion of the partition portion 8 is connected to the bulging step portion 4, and by doing so, not only the rigidity of the container is increased, but also the side wall surface portion 2 and the partition portion 8 are connected. It is possible to increase the strength in the vicinity of the connecting portion 9 where the two intersect and make it difficult for the partition portion 8 to be deformed.

The side wall surface structure 11 is basically the same as the side wall surface structure 1 described above. Briefly, as shown in FIG. 9, in the side wall surface structure 11, a stepped portion 3 is formed on the side wall surface portion 2, and a part of the stepped portion 3 is formed in a trumpet shape (planar view triangular shape) inside the container in a plan view. It is provided as a bulging step portion 4 that swells to the surface. The first to third steps from the bottom surface portion 6 of the bulging step portion 4 are connected to the end portion of the partition portion 8, and the connecting portion 9 where the side wall surface portion 2 and the partition portion 8 intersect is formed.
As a result, the rigidity in the vicinity of the connecting portion 9 is increased, and the partition portion 8 can be made difficult to be deformed.

FIG. 10 shows an example in which the side wall surface portion structure 1 and the side wall surface portion structure 11 are combined. For example, in the packaging container 52 shown in FIG. 5, the side wall surface portion 2 and the partition portion 8 are triangular in a plan view. The accommodating portion 7 is formed in a shape, and the side wall surface portion structure 11 is provided in the connecting portion 9 where each partition portion 8 and the side wall surface portion 2 intersect, and further, the side wall surface portion structure is provided in the side wall surface portion 2 between the two connecting portions 9. 1 can also be provided.
By doing so, the rigidity of the container 52 is increased, and the side wall surface portion 2 is formed in a curved shape, so that the container has an unprecedented aesthetic appearance.

The configuration of the above embodiment is not mentioned as limiting the present invention, and can be changed as long as the technical object is common, and the present invention includes such a change.

1,11 Side wall surface structure of packaging container 2 Side wall surface part 21 Flange part 22 Skirt part 3 stepped part 3a Rising surface 3b Flat part 4 Swelling step part 5,51,52,53 Packaging container 6 Bottom part 6a Convex Part 6b Recessed groove part 7 (7a to 7d) Accommodating part 8 (8a to 8c) Partition part 9 Connecting part

Claims (5)

It is a side wall structure of a packaging container made of a thermoplastic resin sheet and having a side wall surface at the edge of the bottom surface.
The inside of the container is partitioned, and a partition portion connected to the side wall surface portion is provided.
The side wall surface portion is provided with a stepped step portion in which each step extends horizontally, and at least one step of the stepped portion is a bulging step portion having a portion in which a tongue piece-like bulge is formed inside the container. A side wall surface structure of a packaging container in which a side end portion of one step of the stepped portion is extended so as to penetrate into a side surface portion of the partition portion. The side wall surface structure of the packaging container according to claim 1 , wherein the plurality of steps of the stepped portion are the bulging step portions. The side wall surface structure of the packaging container according to claim 1 or 2 , wherein the bulging step portion is formed in the shape of a plan-viewing bow in which the vicinity of the middle in the length direction is bulged inside the container in the shape of a tongue piece. The packaging according to any one of claims 1 to 3, wherein the bulging step portion is formed in a planar visual wave shape in which a plurality of portions bulging in the shape of a tongue piece are provided along the length direction inside the container. The side wall structure of the container. A packaging container having the side wall surface structure according to any one of claims 1 to 4 .

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