JP7306677B2 - packaging container - Google Patents

Description

TECHNICAL FIELD The present invention relates to a packaging container capable of containing foodstuffs such as box lunches, side dishes, vegetables and fruits.

In stores such as retail stores, it is often seen that foodstuffs such as lunch boxes, side dishes, vegetables, and fruits are stored in containers molded from resin sheets and sold. Such a container often has a lid that can be fitted to the container body. If the lid comes off easily, the contents may be lost when the container is overturned, or dust may enter due to the unexpected opening of the lid.

For example, Patent Literature 1 below discloses a packaging container body having a lid-fitting protrusion formed with an inner fitting portion and an outer fitting portion on the outer peripheral edge of an opening, and a lid-fitting protrusion of the packaging container body. A lid covering the opening of the packaging container body having recessed fitting recesses that fit the inner fitting portion and the outer fitting portion of the packaging container body and a lid fitting protrusion of the packaging container body at a predetermined interval. A main body side fitting portion formed by a plurality of uneven portions formed so as to have a predetermined angle with respect to the extending direction of the lid fitting projection piece, and the main body side fitting portion, respectively A packaging container is disclosed which comprises a lid-side fitting portion formed in a fitting concave portion of the fitting lid. This container can be reliably sealed and the lid can be prevented from coming off easily.

Further, Patent Document 2 below discloses a lid made of synthetic resin and a container body made of synthetic resin. A lid projecting portion continuously projecting outward, a lid folded portion extending upward outward from the outer end of the lid projecting portion, and a lid horizontal end portion extending substantially horizontally outward from the outer end of the lid folded portion. A stepped portion to be fitted that descends toward the outside, a body projecting portion that continues from the stepped portion to be fitted and protrudes outward, and an outer end of the body projecting portion. and a main body horizontal end portion extending substantially horizontally outward from the outer end of the main body folded portion. The lid protruding portion, the lid folded portion, and the horizontal end of the lid are arranged so as to be substantially aligned with the body protruding portion, the folded portion, and the horizontal end of the main body, respectively, in the fitted state. A lidded packaging container is disclosed in which the outer edge of the lid horizontal end portion and the outer edge of the body horizontal end portion protrude substantially at the same position. With this container, the lid is not likely to come off from the container at all times, and high airtightness can be obtained.

JP 2012-81965 A Japanese Patent Application Laid-Open No. 2018-115002

In a so-called outer-fitting container in which the lid can be fitted from the outside of the peripheral edge of the container body, the container body may become one size smaller than the design size due to shrinkage during molding. . In such a case, the fitting force between the container body and the lid is weakened, and the lid tends to come off easily. In particular, when the container body is made of foamed resin, it tends to shrink, and there is a high possibility that such a problem will occur.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a packaging container having a structure such as an outer-fitting structure or an inner-outer-fitting structure, in which the lid does not easily come off even if the container body shrinks more than the design value. be.

A packaging container according to one embodiment of the present invention is a packaging container in which a lid can be fitted to a container body, and the outer edge of the lid is provided with a lid skirt portion facing downward. The lower end of the portion is provided with a protruding edge protruding to the outside of the lid, and the lid skirt portion is provided with a fitting convex portion that bulges toward the inside of the lid and extends in the circumferential direction of the lid, In the surface of the projecting edge, a first reinforcing portion having a bent portion extending in the direction of the inside and outside of the lid is provided at least near both ends of the fitting projection, and the fitting projection can be fitted to the container body. characterized by having a fitting portion.

Thus, by providing the first reinforcing portion having the bent portion in the surface of the protruding edge portion, the fitting convex portion is less likely to be deformed toward the inside and outside of the lid, and the fitting convex portion It is possible to prevent the cover from coming off unexpectedly from the cover.

In the packaging container of the above configuration, the first reinforcing portion may be formed by providing a bent portion between the adjacent fitting projections, but from the viewpoint of making it difficult for the fitting projections to deform in the direction inside and outside the lid. Therefore, it is preferable to form the first reinforcing portion by providing bent portions in the vicinity of both end portions of the fitting convex portion.

The packaging container of the above configuration may include a second reinforcing portion having a bent portion extending in the vertical direction in the plane of the lid skirt portion, in which case the bent portion of the first reinforcing portion and the second reinforcing portion A configuration in which the bending portion is continuous can be employed.
In this manner, the second reinforcing portion having the bent portion is provided in the surface of the skirt portion, and the bent portion of the first reinforcing portion and the bent portion of the second reinforcing portion are connected to each other, whereby the fitting convex portion is formed. It becomes more difficult to deform in the inside and outside direction of the lid, and it is possible to prevent the fitting convex portion from unexpectedly coming off the fitting portion.

In the packaging container having the above configuration, it is preferable that the projection width of the fitting convex portion exceeds 0.7 mm. As described above, if the projecting width of the fitting convex portion is long, even if the container body shrinks and becomes smaller than the design value, it is difficult for the lid to come off from the fitting portion, and the lid can be prevented from coming off.

In the packaging container having the above configuration, the height difference between the bent portion of the first reinforcing portion or the bent portion of the second reinforcing portion can be less than 1 mm. Even with such a height difference, it is possible to sufficiently prevent the fitting protrusion from being deformed in the container inward and outward directions.

In the above-described packaging container, the container body can be formed from a foamed resin sheet, and the lid can be formed from a non-foamed resin sheet. Such a combination can more effectively exhibit the effects of the present invention.

1 is a side view showing a packaging container according to an embodiment of the present invention, in which a container body and a lid are separated; FIG. FIG. 2 is a plan view of the packaging container shown in FIG. 1 in a state where a container body and a lid are fitted together; In the packaging container shown in FIG. 1, the container body and the lid are shown in a fitted state, (A) is a partially enlarged end view near the fitting convex portion of the lid, and (B) is the other portion. It is a partially enlarged end view. FIG. 2 is a partially enlarged perspective view showing the vicinity of a fitting convex portion of a lid in the packaging container shown in FIG. 1; (A) shows an enlarged side view of the vicinity of the first reinforcing portion in the packaging container shown in FIG. It is a diagram. (A) and (B) are partially enlarged side views showing other modifications of the first reinforcing portion. (A) shows an enlarged plan view of the vicinity of the first reinforcing portion in the packaging container shown in FIG. 1, and (B) to (D) are partially enlarged planes showing modifications of the first reinforcing portion It is a diagram. 1. It is the partial expansion perspective view which showed the modified example of the cover body in the packaging container shown in FIG. 1, and showed the modified example which provided the 2nd reinforcement part. FIG. 9 is a partially enlarged plan view showing the vicinity of a second reinforcing portion of the lid shown in FIG. 8; 1. It is the partial expansion perspective view which showed the other modified example of the cover body in the packaging container shown in FIG. 1, and showed the modified example which provided the 3rd reinforcing part. 1. It is the side view which showed other embodiment of the cover body in the packaging container shown in FIG. FIG. 12 is a partially enlarged perspective view of the lid shown in FIG. 11; 1. It is the side view which showed other embodiment of the cover body in the packaging container shown in FIG. 14 is a partially enlarged perspective view of the lid shown in FIG. 13; FIG. Fig. 10 is a partially enlarged end view showing a packaging container according to another embodiment of the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION A packaging container according to one embodiment of the present invention will be described below with reference to the drawings.

A packaging container 1 according to one embodiment of the present invention includes a container body 2 and a lid 3 that can be fitted to the container body 2, as shown in FIG. 1 or FIG.

Although the packaging container 1 is not particularly limited, it can accommodate foodstuffs such as lunch boxes, vegetables, side dishes, fruits, boiled rice, and noodles.

As shown in FIG. 1 or FIG. 2, the container body 2 is formed in the shape of a rectangular plate in plan view with four chamfered corners. and a peripheral wall portion 22 .
The shape of the container body 2 is not particularly limited, and may be, for example, circular, elliptical, square, hexagonal, or octagonal in plan view.

The bottom surface portion 21 is formed as a substantially horizontal surface having a rectangular shape in a plan view so that an object such as food can be placed thereon.
In the vicinity of the four corners of the bottom surface portion 21, leg portions 21a are formed by recessing them into an L shape in a plan view.

The peripheral wall portion 22 is formed by bulging the circumference of the outer edge portion of the bottom portion 21, and as shown in FIG. 3, has an inverted U-shaped or triangular cross section. More specifically, as shown in FIG. 3 , an inner wall surface portion 23 is provided on the outer edge of the bottom surface portion 21 and rises in an inclined or curved shape. A main body flange portion 24 projecting in a shape is formed, and a main body skirt portion 25 is formed downward from the outer edge of the main body flange portion 24 and has an inclined surface and a hanging surface. A protruding edge portion 26 is formed at the lower end portion of the main body skirt portion 25 so as to protrude slightly to the outside of the container.

As shown in FIG. 3, in the surface of the body skirt portion 25, a groove-shaped fitting portion 27 is provided which is recessed toward the inside of the body. The fitting portion 27 is provided for fitting the cover 3, and in this embodiment, it is recessed to have a trapezoidal cross section and is formed over the entire circumference of the main body.
The fitting portion 27 may be formed in a short shape and provided intermittently. Moreover, it is preferable to have an inversely tapered portion in the cross-sectional shape. The fitting portion 27 may be, for example, a concave portion having a substantially U-shaped cross section, a substantially U-shaped cross section, or a substantially triangular cross-sectional shape.

As shown in FIG. 2, the lower end portion of the body skirt portion 25 is provided with receiving pieces 28 extending like tongues from the vicinity of two opposite corners of the container body 2 toward the outside of the body.

The container body 2 can be manufactured by thermoforming a resin sheet having a sheet thickness in the range of 0.1 mm to 4 mm, preferably 0.15 mm to 2.5 mm, for example. Thermoforming includes, for example, vacuum forming, pressure forming, vacuum pressure forming, and hot plate forming.

Although the resin sheet is not particularly limited, a non-foamed resin sheet or a foamed resin sheet can be used, and a foamed resin sheet is preferably used. Since the foamed resin sheet is more likely to shrink during molding than the non-foamed resin sheet, the effects of the present invention are exhibited more effectively.

Examples of non-foamed resin sheets include polyolefin resin sheets such as polyethylene resin sheets and polypropylene resin sheets, polystyrene resin sheets, polyethylene terephthalate resin sheets, modified polyethylene terephthalate resin sheets with heat resistance, and the like. A thermoplastic resin sheet such as a polyester resin sheet can be used. Among them, those that can withstand heating in a microwave oven, such as heat-resistant polystyrene-based resin sheets, polypropylene-based resin sheets, and modified polyethylene terephthalate-based resin sheets imparted with heat resistance are preferred.

Examples of foamed resin sheets include foamed polyolefin-based resin sheets, foamed polystyrene-based resin sheets, and foamed polyester-based resin sheets such as foamed polyethylene terephthalate. The expansion ratio of the foamed resin is preferably 2 to 30 times, for example.
A laminated sheet can also be used as the resin sheet, and examples of the laminated sheet include a laminated sheet obtained by thermally laminating a resin film to a non-foamed resin sheet or a foamed resin sheet, a laminated sheet obtained by a coextrusion method, and a laminated sheet obtained by an extrusion lamination method. A sheet etc. can be mentioned.

As shown in FIG. 1 or 2, the lid 3 is formed so as to cover the container body 2, and has a rectangular shape in plan view that matches the shape of the container body 2. As shown in FIG.
The shape of the lid 3 is preferably matched to the shape of the container body 2, and can be, for example, circular, elliptical, square, hexagonal, or octagonal in plan view.

As shown in FIGS. 1 to 3, the lid 3 includes a top surface portion 31 having a substantially horizontal rectangular shape in plan view, a side wall portion 32 inclined downward from the outer edge portion of the top surface portion 31, and a lower edge portion of the side wall portion 32. and a lid skirt portion 34 extending downward from the outer edge of the lid flange portion 33 .

As shown in FIG. 3, the lid body flange portion 33 is formed so as to protrude outward from the lower end portion of the side wall surface portion 32 by a predetermined width. The lid body flange portion 33 is formed so as to rest on the surface of the main body flange portion 24 .

A lid skirt portion 34 consisting of an inclined surface and a hanging surface is provided on the outer edge of the lid flange portion 33 .
The lid body skirt portion 34 can cover the body skirt portion 25 in a state where the lid body 3 is fitted to the container body 2 . At an appropriate position of the lid skirt portion 34, there is provided a fitting protrusion 35 extending in the circumferential direction of the lid with an appropriate length and protruding toward the inside of the lid. In this embodiment, the fitting protrusions 35 are provided near the four corners of the container body 2 and near the intermediate portions of each side. As shown in FIG. 3A, the fitting convex portion 35 is fitted into the fitting portion 27 so that the lid 3 can be externally fitted to the container body 2 .
In this embodiment, the outer fitting is made possible, but a fitting part may also be provided inside the container body so that the inner and outer fitting can be made.

As shown in FIG. 3 or FIG. 4, the fitting projection 35 is formed to have a triangular cross-section so as to protrude inside the lid, and the width of the protrusion from the inner surface of the lid 3 exceeds 0.7 mm. It is preferable to With such a projecting width, even if the container body 2 shrinks more than the design value, the fitting convex portion 35 fits into the fitting portion 27 and the lid 3 can be prevented from coming off. From this point of view, the projecting width of the fitting protrusion 35 is preferably more than 0.7 mm and 4 mm or less, and particularly preferably 1 mm or more and 3 mm or less.

A protruding edge portion 36 is provided at the lower end of the lid skirt portion 34 so as to slightly protrude outwardly of the lid. The protruding edge portion 36 is provided over the entire circumference of the lid body 3, and the first reinforcing portion 4 is formed by providing a bent portion 41 in the plane. The bent portion 41 is formed in a stepped shape extending in the inside and outside directions of the container. The bent portion 41 may be provided anywhere on the projecting edge portion 36, and as shown in FIG.
As shown in FIGS. 4 and 5A, the first reinforcing portion 4 has bent portions 41 near both end portions of the fitting convex portion 35, and the protruding edge portion 36 is substantially the same as the fitting convex portion 35. It is formed with a raised length. As shown in FIGS. 5B and 5C, the first reinforcing portion 4 may be formed by recessing the protruding edge portion 36 to substantially the same length as the fitting protruding portion 35. As shown in 5 (D) and (E), narrow ridges or concave grooves may be provided on the projecting edges 36 near both ends of the fitting projection 35 . The bent portion 41 is formed as a sloped step with a bent corner, but may be formed as a curved step. As shown in FIGS. 6A and 6B, it may be formed with a plurality of unevenness, and may be wavy or zigzag. The bent portion 41 preferably has a length that extends over the entire width of the projecting edge portion 36 while being continuous with the lid skirt portion 34 . By connecting the bent portion 41 to the lid skirt portion 34 to form a continuous structure, the fitting convex portion 35 is less likely to deform toward the inside and outside of the lid, and the fitting convex portion 35 is unexpectedly disengaged from the fitting portion 27. can be prevented.

The bent portion 41 of the first reinforcing portion 4 is formed to extend parallel to the inside and outside of the lid as shown in FIG. 7(A). In addition, it may be formed at an angle, although it is not particularly limited, but it can be formed preferably within 30°, particularly preferably within 20°, with respect to the inside and outside of the lid.
Moreover, the bent portion 41 is preferably provided near the end of the fitting projection 35 , and is preferably provided within 10 mm from the end of the fitting projection 35 , although this is not particularly limited. The protruding edge portion 36 may be uneven over the entire circumference of the lid to provide the bent portion 41 .

As shown in FIG. 8, the second reinforcing portion 5 may be formed by providing a bent portion 51 extending in the vertical direction in the plane of the lid skirt portion 34 . The bent portion 51 may be provided anywhere in the plane of the lid skirt portion 34 . In this embodiment, bent portions 51 are provided near both end portions of each fitting projection 35, and the vicinity of the base end portion of each fitting projection 35 protrudes outside the lid body. The bent portion 41 of the first reinforcing portion 4 and the bent portion 51 of the second reinforcing portion 5 are preferably formed so as to be connected. Furthermore, as shown in FIG. 10 , the third reinforcing portion 6 may be formed by providing a bent portion 61 extending in the circumferential direction of the lid in the vicinity of the upper end portion of each fitting convex portion 35 .
Although the first reinforcing portion 4, the second reinforcing portion 5 and the third reinforcing portion 6 may be provided separately, it is preferable to form them so as to be continuous. For example, as shown in FIG. 10, the first reinforcing portion 4, the second reinforcing portion 5 and the third reinforcing portion 6 are connected, the first reinforcing portion 4 and the second reinforcing portion 5 are connected, and the third reinforcing portion 6 can be provided at a separate position, the second reinforcing section 5 and the third reinforcing section 6 can be connected, and the first reinforcing section 4 can be provided at a separate position.

The height difference of the bent portion 41 (h1 in FIG. 5A), the height difference of the bent portion 51 (h2 in FIG. 9), and the height difference of the bent portion 61 (h3 in FIG. 10) are not particularly limited. , preferably less than 1 mm, and particularly preferably 0.8 mm or less and 0.1 mm or more.

The lid 3 can be manufactured by thermoforming a lid resin sheet having a sheet thickness in the range of 0.1 mm to 2.0 mm, preferably in the range of 0.2 mm to 1 mm. Thermoforming includes, for example, vacuum forming, pressure forming, vacuum pressure forming, and hot plate forming.

Examples of the lid resin sheet include polyolefin resin sheets such as polyethylene resin sheets and polypropylene resin sheets, polystyrene resin sheets, polyethylene terephthalate resin sheets, and modified polyethylene terephthalate resin sheets with heat resistance. A thermoplastic resin sheet such as a polyester resin sheet can be used. Among them, those that can withstand heating in a microwave oven, such as heat-resistant polystyrene-based resin sheets, polypropylene-based resin sheets, and modified polyethylene terephthalate-based resin sheets imparted with heat resistance are preferred.
Although the lid resin sheet is not particularly limited, it is preferably transparent or translucent.

In such a packaging container 1, for example, food is placed on the bottom surface 21, the lid 3 is placed on the container body 2, and the lid 3 is pressed toward the container body 2 to fit the fitting protrusion 35. The lid can be closed by fitting it to the mating portion 27 and fitting it outside.

Since the packaging container 1 is provided with the first reinforcing portion 4, the fitting convex portion 35 is less likely to deform in the lid inner and outer directions, the fitting convex portion 35 is unexpectedly disengaged from the fitting portion 27, and the lid body 3 can be prevented from being opened. Furthermore, if the second reinforcing portion 5 and the third reinforcing portion 6 are provided, the synergistic effect makes it even more difficult for the fitting convex portion 35 to come off from the fitting portion 27 .

By setting the projecting width of the fitting convex portion 35 to more than 0.7 mm, the packaging container 1 can be disengaged from the fitting portion 27 even if the container body 2 shrinks and becomes one size smaller than the design value. This makes it difficult to remove the lid 3 and prevents it from coming off.
It is suitable for the packaging container 1 in which the container body 2 is made of a foamed resin sheet and the lid 3 is made of a non-foamed resin sheet.

Moreover, as shown in FIGS. 11 and 12, the first reinforcing portion 4 can be formed by providing a stepped bent portion 41 between adjacent fitting projections 35 . As a result, the lid skirt portion 34 is less likely to deform toward the inside and outside of the lid, and as a result, the fitting protrusion 35 is also less likely to deform toward the inside and outside of the lid, and the lid 3 is less likely to come off from the container body 2 .

Furthermore, as shown in FIGS. 13 and 14, the second reinforcing portion 5 can be formed by providing a stepped bent portion 51 between adjacent fitting projections 35 . At this time, it is preferable to make the bent portion 41 and the bent portion 51 continuous. This makes it even more difficult for the container skirt portion 34 to deform toward the inside and outside of the lid, and makes it more difficult for the lid 3 to come off the container body 2 .

The configuration aspects of the above-described embodiments are not intended to limit the present invention, and modifications are possible as long as the technical purpose is shared, and the present invention includes such modifications.

For example, as shown in FIG. 15, the fitting portion 27 of the container body 2 is the bottom surface (rear surface) of the protruding edge portion 26, and the fitting convex portion 35 of the lid 3 is the bottom surface (rear surface) of the protruding edge portion 36. It may be possible to engage with the outside so that it is locked to the outside. Alternatively, a configuration in which only the second reinforcing portion 5 is provided without providing the first reinforcing portion 4 may be employed. The protruding edge 36 is a portion to be cut with a punching blade when molding the lid 3. If the protruding edge 36 is provided with the bent portion 41, a height difference may occur, making it difficult to cut. In such a case, the packaging container 1 may be provided with only the second reinforcing portion 2 without providing the first reinforcing portion 4 .

1 packaging container 2 container body 21 bottom portion 21a leg portion 22 peripheral wall portion 23 inner wall portion 24 main body flange portion 25 main body skirt portion 26 projecting edge portion 27 fitting portion 28 receiving piece portion 3 lid body 31 top surface portion 32 side wall Face portion 33 Cover flange portion 34 Cover skirt portion 35 Fitting convex portion 36 Protruding edge portion 4 First reinforcing portion 41 Bending portion 5 Second reinforcing portion 51 Bending portion 6 Third reinforcing portion 61 Bending portion

Claims (8)

A packaging container in which a lid can be fitted to a container body,
The outer edge of the lid is provided with a lid skirt that faces downward,
The lower end of the lid skirt portion is provided with a protruding edge that protrudes to the outside of the lid,
A first reinforcing portion having a bent portion extending in the inside and outside direction of the lid is provided in the plane of the protruding edge,
In the plane of the lid skirt portion, there is provided a fitting convex portion that bulges toward the inside of the lid body and extends in the circumferential direction of the lid body. forming a reinforcement,
The outer edge of the container body is provided with a fitting portion capable of fitting the fitting convex portion,
packaging container. The packaging container according to claim 1, wherein the bent portion of the first reinforcing portion has a height difference of less than 1 mm. A packaging container in which a lid can be fitted to a container body,
The outer edge of the lid is provided with a lid skirt that faces downward,
The lower end of the lid skirt portion is provided with a protruding edge that protrudes to the outside of the lid,
A first reinforcing portion having a bent portion extending in the inside and outside direction of the lid is provided in the plane of the protruding edge,
In the surface of the lid skirt portion, a second reinforcing portion having a fitting convex portion that bulges toward the inside of the lid and extends in the circumferential direction of the lid, and a bent portion that extends in the vertical direction is provided,
The outer edge of the container body is provided with a fitting portion capable of fitting the fitting convex portion,
packaging container. 4. The packaging container according to claim 3 , wherein a plurality of fitting projections are provided, and bent portions extending in the direction outside the lid are provided between adjacent fitting projections to form the first reinforcing portion. The packaging container according to claim 3 or 4, wherein the bent portion of the first reinforcing portion and the bent portion of the second reinforcing portion are connected to each other. The packaging container according to any one of claims 3 to 5, wherein the height difference between the bent portion of the first reinforcing portion and the bent portion of the second reinforcing portion is less than 1 mm. The packaging container according to any one of claims 1 to 6 , wherein the protrusion width of the fitting protrusion exceeds 0.7 mm. The packaging container according to any one of claims 1 to 7, wherein the container body is made of a foamed resin sheet, and the lid is made of a non-foamed resin sheet.

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