Packaging container body

Abstract

To provide a lid body of a packaging container having rigidity to be stacked without providing many ribs at a peripheral wall part.SOLUTION: A lid body 1 of a packaging container is made of a resin sheet, and comprises a top surface part 11 and a side wall part 12 going downward from the circumference of the top surface part. A connection portion between the top surface part 11 and the side wall part 12 is a recessed part 13 recessed toward the inside of the lid body. The recessed part is provided at the whole or a part of a circumferential direction of the lid body. It is preferable that the recessed part 13 has a curved shape in a cross section.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a lid body or a container body of a packaging container made of a resin sheet, which is suitable for stacking. [Background technology]

[0002] Boxed lunches, side dishes, salads, noodles, etc. are often packed in packaging containers made of thin plastic sheets and stacked on display in supermarkets, convenience stores, and other stores. Such packaging containers are made of thin resin sheets and are designed to have sufficient rigidity to prevent deformation even when stacked.

[0003] For example, Patent Document 1 listed below discloses a packaging container that has a container body and a lid, and in which a recess is formed on the top surface of the lid to receive a protrusion formed on the bottom surface of the container body, and which can be stacked in multiple layers so that the protrusion of the container body fits into the recess of the lid, and which is characterized in that a bent portion consisting of a protrusion that protrudes into the lid is formed around the periphery of the recess of the lid, and this packaging container makes it difficult for the lid to be crushed even when stacked in multiple layers. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-52789 Summary of the Invention [Problem to be solved by the invention]

[0005] As disclosed in Patent Document 1 above, a preferred embodiment of the packaging container is that ribs are formed at appropriate intervals in the circumferential direction on the peripheral wall extending downward from the outer periphery of the top surface of the lid, and ribs are often provided to increase the rigidity of the peripheral wall. However, providing many ribs on the peripheral wall obstructs the view and makes it difficult to see the contents stored inside. In particular, when the containers are stacked, the top surface is covered and the only visible area inside is the peripheral wall, so providing many ribs here can make it difficult to see what the contents are.

[0006] Therefore, the object of the present invention is to provide a lid body for a packaging container that is rigid enough to be stacked without providing a large number of ribs or the like on the peripheral wall, and also to provide a container body with a similar structure. [Means for solving the problem]

[0007] reference The lid body of the packaging container of this form is a lid body of a packaging container made of a resin sheet having a top surface portion and a side wall portion extending downward from its periphery, and is characterized in that the connecting portion between the top surface portion and the side wall portion is a recessed portion that is recessed toward the inside of the lid body, and the recessed portion is provided along all or part of the circumferential direction of the lid body.

[0008] In this way, by making the connecting portion between the top surface and the side wall portion of the lid body of a thin-walled packaging container made of a resin sheet a concave portion, the concave portion will bend even when other packaging containers are placed on the top surface, and will absorb external forces appropriately, making it less likely that the side wall portion will be crushed even when stacked.

[0009] In the above embodiment, the recessed portion may be curved in cross section. This allows the recessed portion to more easily absorb external forces and to more easily restore its original shape due to its elasticity.

[0010] In the above embodiment, the top surface and the side wall can each be flat. By doing so, if the lid is made transparent, the inside of the container can be easily seen because there are no ribs on the top surface or side wall. When the containers are stacked, the contents can be seen through the side wall.

[0011] The container body of a packaging container according to one embodiment of the present invention has a bottom portion and a side wall portion extending upward from the periphery of the bottom portion, and is made of a resin sheet, wherein the connecting portion between the bottom portion and the side wall portion is a recessed portion recessed toward the inside of the body, and the recessed portion is provided in all or part of the circumferential direction of the body, and the radius of curvature on the surface side of a first connecting portion which is a connecting portion between the bottom portion and the recessed portion and a second connecting portion which is a connecting portion between the side wall portion and the recessed portion is 1.0 mm or less. Formed into It is characterized by the fact that Even in this case, as with the lid body, the recessed portions bend even when stacked and absorb external forces appropriately, making it difficult for the side walls and the like to be crushed. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a perspective view of a lid of a packaging container according to an embodiment of the present invention. [Figure 2] 2 is a side view of the cover of FIG. 1 as seen from the longitudinal side wall portion side. [Figure 3] 2 is a side view of the cover of FIG. 1 as seen from the shorter side wall portion side. [Figure 4] FIG. 2 is a plan view of the lid of FIG. [Figure 5] 2 is a partially enlarged end view of the side wall of the cover shown in FIG. 1. FIG. [Figure 6] FIG. 2 is a perspective view showing an example of a container body fitted to a lid body in FIG. [Figure 7] FIG. 1 is a diagram illustrating a state in which the top surface of the lid is pressed down. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, one embodiment of a lid for a packaging container of the present invention will be described with reference to the drawings.

[0014] A lid 1 for a packaging container according to one embodiment of the present invention includes a top surface portion 11, a side wall portion 12, and a recessed portion 13, as shown in FIG.

[0015] 2 to 4, the top surface 11 is formed as a horizontal surface that is a flat surface that is rectangular in plan view. By making it a flat surface, it is easy to stack them, and if it is made transparent, it is easy to see inside. In this embodiment, the shape is rectangular in plan view, but is not limited to this, and may be rectangular in plan view such as a square or rhombus, polygonal in plan view such as a hexagon or octagon, circular, oval, etc. Also, in this embodiment, the surface is flat, but the shape may be a curved surface (dome) that bulges near the center, a curved arch shape in side view, or a wavy shape with repeated concave and convex shapes.

[0016] 5, the side wall portion 12 is formed as a flat surface that slopes downward from the periphery of the top surface portion 11. By making it a flat surface, if it is made transparent, the inside can be easily seen. In this embodiment, the surface is an inclined flat surface, but the present invention is not limited to this, and the surface may be a drooping surface, a convex curved surface, or a concave curved surface. The angle (θ in FIG. 5) formed between the top surface 11 and the side wall 12 is not particularly limited, but is preferably 90° or more, and its upper limit is preferably 110° or less.

[0017] The recessed portion 13 is formed around the entire circumferential circumference by recessing the area near the connection between the top surface 11 and the side wall 12. In this embodiment, the recessed portion 13 is formed around the entire circumferential circumference of the lid body. However, this is not limited to this. The recessed portion 13 may be formed only in a portion and intermittently. It is preferable that the other portions be bent at right or obtuse angles. Providing the recessed portion 13 around the entire circumferential circumference maximizes the external force absorption function, but may reduce the rigidity of the lid body 1. Furthermore, forming the recessed portion 13 in a square shape rather than a square shape can increase the rigidity of the lid body 1. Furthermore, a square shape may be preferable from the perspective of design. It is preferable to design the lid body 1 while balancing the external force absorption and rigidity, taking design into consideration. From this perspective, it is preferable to form the recessed portion 13 over at least about half, particularly at least about 70%, and even more preferably at least about 80% of the entire circumferential length around the connection between the top surface 11 and the side wall 12. The cross section of the recessed portion 13 is curved. This cross section does not have to be an arc shape with 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 recessed portion 13, making it easier to restore its original shape. In this embodiment, the cross section is curved, but this is not limiting, and it is sufficient that the cross section is recessed, and it may be recessed in a broken line shape.

[0018] Although not particularly limited, first connecting portion 14, which is the connecting portion between top surface portion 11 and recessed portion 13, preferably has a radius of curvature R of 1.0 mm or less on the surface side of lid 1. Furthermore, although not particularly limited, second connecting portion 15, which is the connecting portion between side wall portion 12 and recessed portion 13, preferably has a radius of curvature R of 1.0 mm or less on the surface side of lid 1. This allows recessed portion 13 to efficiently absorb the load.

[0019] The recessed portion 13 is preferably formed with a constant width, and is preferably formed with a narrow width. More specifically, as shown in Fig. 2, the width W of the recessed portion 13 in a plan view is preferably 8% or less of the width W' of the top surface portion 11 and the recessed portion 13. If the width is too wide, the recessed portion 13 will bend too much, causing the top surface portion 11 to sink significantly when stacked. Note that the width W' indicates the maximum width of the top surface portion 11 and the recessed portion 13.

[0020] A flange 16 is formed at the lower end of the side wall 12, facing outward from the lid body, and a fitting portion 17 is provided at the tip of the flange 16 as a hanging surface. The fitting portion 17 is formed with engagement portions 18 that protrude toward the inside of the lid body so that it can fit into the container body 2. The engagement portions 18 are formed intermittently with an appropriate length in the circumferential direction. The lid body 1 is provided with tongue-shaped tabs 19 at its four corners.

[0021] The container body 2 to be covered with the lid body 1 may have any shape as long as it is designed so that the lid body 1 can be covered. As shown in Figure 6, the container body 2 is a so-called "hakama" type, and has a rectangular shape in a plan view and a side wall portion 22 that rises upward from the periphery of a horizontal bottom surface portion 21.The upper end of the wall portion 22 is folded back to the outside of the body to form a fitting portion 23, and the lower end of the fitting portion 23 extends downward to form a leg portion 24.

[0022] The fitted portion 23 is designed so that the fitting portion 17 of the lid 1 can be fitted onto it from the outside, and has a locking portion 25 formed around the entire periphery that protrudes outward from the main body, with which the engaging portion 18 can be engaged. In this embodiment, the lid body 1 is configured to be externally fitted to the container body 2, but this is not limited to this and may be a fitting structure such as internal fitting or internal / external fitting, or a structure in which the lid body 1 is placed on the container body 2.

[0023] The packaging container consisting of the lid body 1 and the container body 2 can store, for example, foodstuffs, more specifically, boxed lunches, side dishes, sushi, salads, and the like.

[0024] The lid 1 and the container body 2 can be manufactured by thermoforming a synthetic resin sheet, although there are no particular limitations on the material. The synthetic resin sheet may be either a non-foamed resin sheet or a foamed resin sheet, with a non-foamed resin sheet being preferred. In the case of a non-foamed resin sheet, it is preferable to use a so-called thin resin sheet, specifically a sheet having a thickness in the range of 0.1 mm to 2.0 mm, particularly 0.2 mm to 1.2 mm. 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, and it is also preferable to use a foamed resin sheet having an expansion ratio of 1.05 to 20.0 times, particularly 1.5 to 15.0 times.

[0025] Examples of non-foamed resin sheets that can be used include thermoplastic resin sheets such as polyolefin resin sheets, such as polyethylene resin sheets and polypropylene resin sheets, and polyester resin sheets, such as polystyrene resin sheets, polyethylene terephthalate resin sheets, and heat-resistant modified polyethylene terephthalate resin sheets. Furthermore, materials that can withstand heating in a microwave oven, such as heat-resistant polystyrene resin sheets, polypropylene resin sheets, and heat-resistant modified polyethylene terephthalate resin sheets, may also be used.

[0026] Examples of foamed resin sheets that can be used include foamed polyolefin resin sheets, foamed polystyrene resin sheets, and foamed polyester resin sheets such as foamed polyethylene terephthalate. A laminated sheet obtained by laminating synthetic resin sheets can also be used. Examples of the laminated sheet include a laminated sheet obtained by thermally laminating a resin film onto a non-foamed resin sheet or a foamed resin sheet, a laminated sheet obtained by a co-extrusion method, and a laminated sheet obtained by an extrusion lamination method.

[0027] Examples of thermoforming include vacuum forming, pressure forming, vacuum pressure forming, hot plate forming, etc. When thermoforming the lid 1, it is preferable to use a male mold. By using a male mold, it becomes easier to increase the thickness of the top surface portion 11, thereby increasing its rigidity.

[0028] The lid 1 and the container body 2 may be colored, such as black or white, but are preferably transparent or translucent so that the interior can be seen. In particular, the lid 1 is preferably transparent or translucent, and the container body 2 is preferably opaque, such as black. The surface of the lid 1 may be printed or engraved with letters, pictures, or the like, as long as it does not impede visibility, and may be provided with ribs for reinforcement or textured to prevent slipping. A rectangular bulging stacking protrusion S may also be provided, which prevents the lids 1 from sticking together when stacked.

[0029] Although not shown, as another embodiment of the present invention, a structure in which a recessed portion is provided in the container body can also be used. This container body has a structure in which the lid 1 is turned upside down, and more specifically, has side walls extending upward from the periphery of the flat bottom, and the connecting portion between the bottom and side walls can be formed as a recessed portion recessed toward the inside of the body. In this case, too, it is preferable that the recessed portion be curved in cross section, and that the bottom and side walls each be flat. In such a container body, the recessed portion can absorb the load on the container body, making the side wall portion less likely to be crushed.

[0030] The lid 1 and the container body 2 may be integrally connected by a hinge portion to form a so-called food pack.

[0031] The packaging container of this embodiment can be used, for example, by placing food in the container body 2 and then fitting the lid body 1 thereto.

[0032] When this packaging container is stacked, even if the top surface 11 is pressed down, the recessed portion 13 bends as shown in Fig. 7, and the side wall portion 12 is less likely to be crushed because a load is not applied to the side wall portion 12. Therefore, it is not necessary to provide ribs or the like for reinforcing the side wall portion 12. In particular, when the lid body 1 is transparent, there are no ribs or the like on the side wall portion 12 even when stacked, so visibility is good and the contents inside can be confirmed.

[0033] When the load on the top surface portion 11 is removed, the elastic force of the recessed portion 13 allows it to return to its original shape.

[0034] The configurations of the above-described embodiments are not intended to limit the present invention, and modifications are possible as long as the technical purpose is the same, and the present invention includes such modifications. [Explanation of symbols]

[0035] 1 lid 11Top section 12 Side wall 13 concave part 14 First connection part 15Second connection part 16 flange part 17 fitting part 18 Engagement part 19. Knob 2 container bodies 21 Bottom part 22 Side wall 23 mating part 24 legs 25 locking part S stack protrusion

Claims

1. A container body of a packaging container made of a resin sheet, having a bottom surface and a side wall portion extending upward from the periphery of the bottom surface, wherein the connecting portion between the bottom surface and the side wall portion is a concave portion recessed toward the inside of the body, and the concave portion is provided along all or part of the circumference of the body, and the container body of the packaging container is formed so that the radius of curvature on the surface side of a first connecting portion which is the connecting portion between the bottom surface and the concave portion and a second connecting portion which is the connecting portion between the side wall surface and the concave portion is 1.0 mm or less.

2. 2. The container body of a packaging container according to claim 1, wherein the recessed portion has a curved cross section.

3. 3. The container body of a packaging container according to claim 1, wherein the bottom surface and the side wall are each flat.

4. A packaging container using the container body of a packaging container described in any one of claims 1 to 3.

5. A method for manufacturing a container body of a packaging container, which manufactures the container body of a packaging container described in any one of claims 1 to 3 using a male mold.

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