JP2021167210A - Lid body of packaging container or container body - Google Patents

Abstract

To provide a rigid lid body of a packaging container that can be stacked without providing a large number of ribs on a peripheral wall part.SOLUTION: The lid body 1 of a packaging container is made of a resin sheet, and has a top surface part 11 and a side wall part 12 extending downward from a peripheral edge thereof, further a recessed part 13 in which a connecting part between the top surface part 11 and the side wall part 12 is recessed toward the inside of the lid body, and the concave part is provided in all or a part in the peripheral direction of the lid body. The recessed part 13 is preferably curved in cross section.SELECTED DRAWING: Figure 2

Description

The present invention relates to a lid or a container body of a packaging container made of a resin sheet, which is suitable for stacking.

Lunch boxes, side dishes, salads, noodles, etc. are often stored in packaging containers made of thin resin sheets and displayed in layers at supermarkets and convenience stores.
Although such a packaging container is made of a thin-walled resin sheet, it is designed to have rigidity that does not deform even when stacked.

For example, in Patent Document 1 below, a container body and a lid are provided, and a recess for receiving a convex portion formed on the bottom surface of the container body is formed on the top surface of the lid, and the convex portion of the container body is formed. In a packaging container that can be stacked in multiple stages so as to enter the recess of the lid, the packaging is characterized in that a bent portion formed of ridges protruding into the lid is formed on the peripheral edge of the recess of the lid. A container for packaging is disclosed, and the lid of this packaging container is not easily crushed even when stacked in multiple stages.

JP-A-2010-52789

As a preferred embodiment of the packaging container described in Patent Document 1, it is disclosed that ribs are formed on a peripheral wall portion extending downward from the outer periphery of the top surface portion of the lid body at appropriate intervals in the circumferential direction. As described above, ribs are often provided in order to increase the rigidity of the peripheral wall portion.
However, if a large number of ribs are provided on the peripheral wall portion, the ribs block the field of view and the visibility of the contained object housed inside deteriorates. Especially in the case of stacking, the top surface is covered and the part where the inside can be seen is limited to the peripheral wall part, so if a large number of ribs are provided here, it will be difficult to confirm what the contents are. There was a case that it ended up.

Therefore, an object of the present invention is to provide a lid of a packaging container having rigidity that allows stacking without providing a large number of ribs on the peripheral wall portion, and also to provide a container body having a similar structure. ..

The lid of the packaging container of one embodiment of the present invention is a lid of a packaging container made of a resin sheet, which has a top surface portion and a side wall portion extending downward from the peripheral edge thereof, and the top surface portion and the side wall portion. The connecting portion is a concave portion that is recessed toward the inside of the lid body, and the concave portion is provided in all or a part of the peripheral direction of the lid body.

In this way, in the lid of a thin-walled packaging container made of a resin sheet, by making the connecting portion between the top surface portion and the side wall portion concave, even if another packaging container or the like is placed on the top surface portion, the concave portion is formed. Since it bends and absorbs external force appropriately, the side walls and the like are less likely to be crushed even when stacked.

In the above form, the concave portion can be curved in cross section.
By doing so, the concave portion easily absorbs an external force and is easily restored by elasticity.

In the above embodiment, the top surface portion and the side wall portion can be made flat.
By doing so, when the lid body is made transparent or the like, the inside of the container can be easily visually recognized because there are no ribs or the like on the top surface portion and the side wall portion. When the containers are stacked, the contents can be confirmed through the side wall.

Further, the container main body of the packaging container of one embodiment of the present invention is a container main body of a packaging container having a bottom surface portion and a side wall portion extending upward from the peripheral edge thereof and made of a resin sheet, and the bottom surface portion and the said. It is characterized in that the connecting portion with the side wall portion is a concave portion recessed toward the inside of the main body, and the concave portion is provided in all or a part in the circumferential direction of the main body.
Even in this way, similarly to the lid body, the concave portion bends even when stacked, and the external force is appropriately absorbed, so that the side wall portion and the like are less likely to be crushed.

It is a perspective view of the lid body of the packaging container of one Embodiment of this invention. It is a side view which looked at the lid body of FIG. 1 from the side of the longitudinal side wall part. It is a side view which looked at the lid body of FIG. 1 from the side wall part side of a short side. It is a top view of the lid body of FIG. It is a partially enlarged end view which cut the side wall part of the lid body of FIG. FIG. 1 is a perspective view showing an example of a container body fitted to a lid body. FIG. 1 is a diagram for explaining a state in which the top surface portion of the lid body is pressed.

Hereinafter, an embodiment of the lid of the packaging container of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the lid 1 of the packaging container according to the embodiment of the present invention includes a top surface portion 11, a side wall portion 12, and a concave portion 13.

As shown in FIGS. 2 to 4, the top surface portion 11 is formed in a horizontal plane shape as a flat surface having a rectangular shape in a plan view. A flat surface makes it easy to stack, and when it is made transparent, the inside becomes easy to see.
In the present embodiment, the shape is rectangular in a plan view, but the present invention is not limited to this, and a rectangular shape in a plan view such as a square or a rhombus, a polygonal shape in a plan view such as a hexagon or an octagon, a circular shape, or an oval shape. And so on. Further, although it is a flat surface in the present embodiment, it may be a curved surface (dome) shape in which the vicinity of the center bulges, an arch shape curved in a side view, a wavy shape in which irregularities are repeated, or the like.

As shown in FIG. 5, the side wall portion 12 is formed on a flat surface inclined downward from the periphery of the top surface portion 11. By making the surface flat, the inside can be easily seen when it is made transparent.
In the present embodiment, the flat surface is inclined, but the surface is not limited to this, and may be a hanging surface shape, a convex curved surface shape, or a concave curved surface shape.
The angle formed by the top surface portion 11 and the side wall portion 12 (θ in FIG. 5) is not particularly limited, but is preferably 90 ° or more. The upper limit is preferably 110 ° or less.

The concave portion 13 is formed by denting the vicinity of the connecting portion between the top surface portion 11 and the side wall portion 12 over the entire circumference in the circumferential direction. In the present embodiment, the concave portion 13 is formed over the entire circumference in the circumferential direction of the lid, but the present invention is not limited to this, and the concave portion 13 may be provided in a part and formed intermittently. .. The other part is preferably bent at a right angle or an obtuse angle. If the concave portion 13 is provided over the entire circumference in the circumferential direction, the function of absorbing external force can be maximized, but the rigidity of the lid 1 may decrease. Further, if the concave portion 13 is formed into a square shape instead of the concave portion 13, the rigidity of the lid body 1 can be increased. Further, from the viewpoint of design, it may be preferable to make it angular. It is preferable to design the lid 1 in consideration of design while adjusting the rigidity with the external force absorption. From this point of view, the concave portion 13 is provided at about half or more, particularly about 70% or more, and further about 80% or more with respect to the length of the entire circumference in the circumferential direction near the connecting portion between the top surface portion 11 and the side wall portion 12. Is preferable.
The concave portion 13 has a curved cross section. This cross section does not have to be an arc shape having a constant radius as long as it is formed in a curved shape. By doing so, the load on the top surface portion 11 can be absorbed by the concave portion 13, and the restoration can be easily performed.
In the present embodiment, the cross section is curved, but the present invention is not limited to this, and the cross section may be recessed or may be recessed in a polygonal line shape.

The first connecting portion 14, which is the connecting portion between the top surface portion 11 and the concave portion 13, is not particularly limited, but the radius of curvature R on the surface side of the lid 1 is preferably 1.0 mm or less. The second connecting portion 15, which is a connecting portion between the side wall portion 12 and the concave portion 13, is not particularly limited, but the radius of curvature R on the surface side of the lid 1 is preferably 1.0 mm or less. .. By doing so, the load can be efficiently absorbed by the concave portion 13.

It is preferable that the concave portion 13 is formed with a constant width and is formed with a narrow width. More specifically, as shown in FIG. 2, the width W of the concave portion 13 in a plan view is set to be 8% or less of the width W'of the top surface portion 11 and the concave portion 13. preferable. If the width is wide, the concave portion 13 bends too much, and the top surface portion 11 sinks significantly when stacked. The width W'indicates the maximum width of the top surface portion 11 and the concave portion 13.

A flange portion 16 facing the outside of the lid is formed at the lower end portion of the side wall portion 12, and a fitting portion 17 having a hanging lower surface is provided at the tip end portion thereof.
The fitting portion 17 is formed with an engaging portion 18 projecting toward the inside of the lid so that the fitting portion 17 can be fitted to the container body 2. The engaging portion 18 is formed intermittently with an appropriate length in the circumferential direction. The four corners of the lid 1 are provided with knobs 19 protruding in the shape of a tongue piece.

The container body 2 on which the lid 1 is covered may have any shape as long as it is designed so that the lid 1 can be covered.
As shown in FIG. 6, the container body 2 is, for example, a so-called hakama type, includes a side wall portion 22 that rises upward from the peripheral edge of the bottom surface portion 21 that is rectangular and horizontal in a plan view, and has an upper end portion of the wall surface portion 22. The fitted portion 23 is provided by folding back to the outside of the main body, and the lower end portion thereof is extended downward to form the leg portion 24.

The fitted portion 23 is provided so that the fitting portion 17 of the lid 1 can be externally fitted, and the locking portion 25 protruding to the outside of the main body is formed over the entire circumference, and the engaging portion 18 is engaged. It is done like this.
In the present embodiment, the lid body 1 is externally fitted to the container body 2, but the present invention is not limited to this, and a fitting structure such as internal fitting or internal / external fitting may be used. The structure may be placed on the container body 2.

The packaging container composed of the lid 1 and the container body 2 can, for example, store foodstuffs and the like, and more specifically, store lunch boxes, side dishes, sushi, salads, and the like. Can be done.

The lid 1 and the container body 2 are not particularly limited, but can be manufactured by thermoforming a synthetic resin sheet. The synthetic resin sheet may be either a non-foamed resin sheet or a foamed resin sheet, but a non-foamed resin sheet is preferable.
In the case of a non-foamed resin sheet, it is preferable to use a so-called thin-walled resin sheet, and in many cases, the thickness is within the range of 0.1 mm to 2.0 mm, particularly within the range of 0.2 mm to 1.2 mm. It is preferable to use a sheet.
In the case of a foamed resin sheet, it is preferable to use a sheet having a thickness in the range of 0.5 mm to 4.0 mm, particularly 0.7 mm to 2.2 mm. Further, in the case of a foamed resin sheet, the foaming ratio is preferably 1.05 times to 20.0 times, particularly 1.5 times to 15.0 times.

Examples of the non-foamed resin sheet include polyolefin resin sheets such as polyethylene resin sheets and polypropylene resin sheets, polystyrene resin sheets, polyethylene terephthalate resin sheets, and polyesters such as modified polyethylene terephthalate resin sheets imparted with heat resistance. A thermoplastic resin sheet such as a based resin sheet can be used. Further, a material that can withstand the heating of a microwave oven, for example, a heat-resistant polystyrene-based resin sheet, a polypropylene-based resin sheet, or a modified polyethylene terephthalate-based resin sheet imparted with heat resistance may be used.

As the foamed resin sheet, for example, a foamed polyester resin sheet such as a foamed polyolefin resin sheet, a foamed polystyrene resin sheet, or a foamed polyethylene terephthalate can be used.
A laminated sheet in which synthetic resin sheets are laminated can also be used, and the laminated sheet is, for example, a non-foamed resin sheet or a laminated sheet in which a resin film is heat-laminated on a foamed resin sheet, a laminated sheet by a coextrusion method, or an extrusion lamination method. Laminated sheets and the like can be mentioned.

Examples of thermoforming include vacuum forming, compressed air forming, vacuum compressed air forming, and hot plate forming. When thermoforming the lid 1, it is preferable to use a male mold. By using the male mold, it becomes easy to increase the thickness of the top surface portion 11, and the rigidity can be increased.

The lid 1 and the container body 2 may be colored such as black or white, but it is preferable that the lid 1 and the container body 2 are transparent or translucent so that the inside can be visually recognized. 2 is preferably non-transparent such as black. In addition, the surface of the lid 1 may be printed or engraved with characters, patterns, etc. to the extent that it does not interfere with visibility, and ribs for reinforcement and graining for slip prevention may be provided. May be good. It is also possible to provide a stacking protrusion S that bulges in a rectangular parallelepiped shape so that the lids 1 do not come into close contact with each other when the lids 1 are stacked.

Although not shown, as another embodiment of the present invention, the container body may be provided with a concave portion.
This container body has, for example, a structure in which the lid 1 is turned upside down, and more specifically, it has a side wall portion extending upward from the peripheral edge of the flat bottom surface portion, and the bottom surface portion and the side wall portion are connected to each other. The portion can be formed as a concave portion recessed toward the inside of the main body. Also in this case, it is preferable that the concave portion has a curved cross section and the bottom surface portion and the side wall portion have flat surfaces.
Since the concave portion of such a container body can absorb the load on the container body, the side wall portion is less likely to be crushed.

A so-called hood pack may be formed in which the lid body 1 and the container body 2 are integrally connected by a hinge portion.

The packaging container of the present embodiment can be used, for example, by accommodating a food product in the container body 2 and then fitting the lid body 1.

When the packaging containers are stacked, even if the top surface portion 11 is pressed, the concave portion 13 is bent, the side wall portion 12 is less likely to be loaded, and the side wall portion 12 is less likely to be crushed. .. Therefore, it is not necessary to provide a rib or the like for reinforcing the side wall portion 12. In particular, when the lid 1 is made transparent, there are no ribs or the like on the side wall portion 12 even when stacked, so visibility is good and the internal contents can be confirmed.

If the load applied to the top surface portion 11 is removed, the original shape can be restored by the elastic force of the concave portion 13.

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 Lid 11 Top surface 12 Side wall 13 Concave part 14 First connecting part 15 Second connecting part 16 Flange part 17 Fitting part 18 Engaging part 19 Knob part 2 Container body 21 Bottom part 22 Side wall part 23 Fitted part 24 legs 25 locking part S stack protrusion

Claims (8)

It is a lid of a packaging container made of a resin sheet and has a top surface portion and a side wall portion extending downward from the peripheral edge thereof. A lid body of a packaging container in which the concave portion is provided as a part in all or a part in the circumferential direction of the lid body. The lid of a packaging container according to claim 1, wherein the concave portion has a curved cross section. The lid of a packaging container according to claim 1 or 2, wherein the top surface portion and the side wall portion are flattened, respectively. A concave portion of a packaging container made of a resin sheet, which has a bottom surface portion and a side wall portion extending upward from the peripheral edge thereof, and in which a connecting portion between the bottom surface portion and the side wall portion is recessed toward the inside of the main body. The container main body of the packaging container in which the concave portion is provided in all or a part in the circumferential direction of the main body. The container body of the packaging container according to claim 4, wherein the concave portion has a curved cross section. The container body of the packaging container according to claim 4 or 5, wherein the bottom surface portion and the side wall portion are flattened, respectively. A packaging container using the lid of the packaging container according to any one of claims 1 to 3 or the container body of the packaging container according to any one of claims 4 to 6. The lid of the packaging container according to any one of claims 1 to 3 or the lid of the packaging container for which the container body of the packaging container according to any one of claims 4 to 6 is manufactured by using a male mold. Or the manufacturing method of the container body.

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