Packaging containers

Abstract

To provide a packaging container which can automatically return to an original shape even when a corner part deforms when an internal pressure is applied to the corner part.SOLUTION: A packaging container includes a bottom wall 110, side walls 120 standing from the bottom wall 110, and a corner part 140 between the side walls 120. At the corner part 140, a corner rib 150 is provided which extends in the vertical direction and which is curved to the inside. At the corner rib 150, curved concave ribs 160 are provided along an inside surface 153 of the corner rib 150.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a packaging container for storing food products. [Background Art]

[0002] Conventionally, the container described in Patent Document 1 has been known. This container is capable of accommodating beverages and the like therein, and includes a bottom wall, a side wall rising from the bottom wall, and a corner portion between the side walls. The corner portion is chamfered so as to extend vertically, and a plurality of protrusions are provided vertically side by side at the chamfered portion. The corner portion is reinforced by these protrusions. Therefore, when a force is applied to push the corner portion inward from the outside, even if the corner portion deforms inward, it can be restored to its original shape.

[0003] In the container of Patent Document 1, the rigidity of the corner portion is made relatively high so that it can withstand a strong external force from the outside. However, when internal pressure pushing from the inside to the outside is applied to the corner portion from the inside of the container, it has not been considered that the corner portion can be elastically deformed and restored to the original shape. [Prior Art Document] [Patent Document]

[0004] [Patent Document 1] Japanese Patent No. 5966358 [Summary of the Invention] [Problem to be Solved by the Invention]

[0005] In view of the above problem, the present invention provides a packaging container that can automatically return to its original shape even if the corner portion is deformed when internal pressure is applied to the corner portion. [Means for Solving the Problem]

[0006] To solve the above problem, the packaging container according to claim 1 of the present invention comprises a bottom wall and a side wall rising from the bottom wall, The corner of the bottom wall A packaging container having a corner section between the side walls, wherein the corner section is provided with a corner rib that extends vertically and curves inward, and the corner rib has, It extends to both ends of the corner rib, and the along the inner surface of the corner rib extend It is characterized by having curved concave ribs.

[0007] Based on the above characteristics, the concave rib is formed in a curved shape along the inner surface of the corner rib, resulting in a strong force that returns the corner rib to its original shape. As a result, the entire corner rib with the concave rib is less prone to cracking even under internal pressure and can automatically return to its original shape.

[0008] Furthermore, in the packaging container according to claim 2 of the present invention, the recessed ribs are characterized in that they extend along the horizontal direction.

[0009] According to the above characteristics, the material can be elastically deformed to release internal pressure along the horizontal direction, thereby effectively absorbing internal pressure and then easily returning to its original shape.

[0010] Furthermore, the packaging container according to claim 3 of the present invention is characterized in that a plurality of recessed ribs are provided, and the plurality of recessed ribs are parallel to each other.

[0011] According to the above characteristics, since each concave rib is parallel, they do not interfere with each other when they deform, and the elastic deformation and recovery of each concave rib are performed effectively. [Effects of the Invention]

[0012] The packaging container of the present invention can automatically return to its original shape even if the corner deforms when internal pressure is applied to the corner. [Brief explanation of the drawing]

[0013] [Figure 1](a) is a plan view of the packaging container of the present invention, (b) is a side view of the packaging container, and (c) is a side view of the packaging container as seen from a corner. [Figure 2] (a) is an enlarged plan view of the area around the corner of the packaging container in Figure 1(a), and (b) is a cross-sectional view of the CC. [Figure 3] (a) is a cross-sectional view of AA in Figure 1(a), and Figure 3(b) is a cross-sectional view of BB in Figure 1(a). [Explanation of Symbols]

[0014] 100 Packaging containers 110 Bottom wall 120 side wall 140 Corner section 150 Corner Ribs 153 Inner surface 160 concave ribs [Modes for carrying out the invention]

[0015] Embodiments of the present invention will be described below with reference to the drawings. In this specification, "upward" refers to the direction upward in the vertical direction when the packaging container is placed on a horizontal surface with its opening facing upward, "downward" refers to the direction downward in the vertical direction, "horizontal" refers to the direction in the horizontal direction, and "vertical" refers to the direction perpendicular to "horizontal" in the horizontal plane.

[0016] First, Figure 1 shows the packaging container 100 of the present invention. Figure 1(a) is a plan view of the packaging container 100, Figure 1(b) is a side view of the packaging container 100, and Figure 1(c) is a side view of the packaging container 100 as seen from a corner.

[0017] As shown in Figure 1, the packaging container 100 is in the shape of a deep dish with an upward opening, and comprises a bottom wall 110 that is substantially square in plan view, a side wall 120 formed to rise from the bottom wall 110, and a flange portion 130 extending laterally from the upper end of the side wall 120. The side wall 120 and the flange portion 130 are continuously provided over the entire circumference in the circumferential direction of the packaging container 100.

[0018] Further, a corner rib 150 extending in the vertical direction is provided at a corner portion 140 between the side walls 120. The corner rib 150 is curved inward in plan view. Also, it is inclined inward from the upper end 151 toward the lower end 152.

[0019] Note that the packaging container 100 according to the present embodiment uses a sheet-shaped material that can be sheet-molded (e.g., vacuum molding, pressure forming, hot platen molding) and has a thickness of about 0.1 mm to 1.00 mm (millimeters). For example, as the material of the packaging container 100, A-PET, transparent biaxially oriented polystyrene (OPS), polypropylene (PP) or polystyrene (PS) can be used so as to ensure visibility of the contents. In addition, although the packaging container 100 is substantially square in plan view, it can be appropriately modified to other shapes such as polygonal in plan view, circular in plan view, etc.

[0020] Next, with reference to Figure 2 and Figure 3, the structure around the corner portion 140 and the side wall 120 of the packaging container 100 will be described in further detail. Note that Figure 2(a) is an enlarged plan view of the area around the corner portion 140 of the packaging container 100 in Figure 1(a), Figure 2(b) is a sectional view taken along line C-C, Figure 3(a) is a sectional view taken along line A-A in Figure 1(a), and Figure 3(b) is a sectional view taken along line B-B in Figure 1(a).

[0021] As shown in Figure 2, the corner rib 150 is provided with multiple recessed ribs 160 that are recessed outward from the inner surface 153 of the corner rib 150. Furthermore, in a plan view, these recessed ribs 160 are curved inward along the inwardly curved inner surface 153 of the corner rib 150. In addition, as shown in Figure 3(a), the recessed ribs 160 extend horizontally from one end 161 to the other end 162 in a side view. Also, each recessed rib 160 is parallel to the others in a side view.

[0022] Here, the packaging container 100 is sealed with a lid or film while containing food such as pickles inside. When the lid or film is pressed downwards to seal the packaging container, or when the lid or film is peeled off, the lid or film is pressed, creating internal pressure inside the packaging container 100. As a result, as shown in Figure 2, the internal pressure F generated from the inside to the outside of the packaging container 100 concentrates on the corner rib 150 of the corner portion 140. The concave rib 160 of the corner rib 150 then elastically deforms outwards to absorb the internal pressure F, and then returns to its original shape. In particular, since the concave rib 160 is formed in a curved shape along the inner surface 153 of the corner rib 150, the force that causes the corner rib 150 to return to its original shape is strong. As a result, the entire corner rib 150 with the concave rib 160 is less likely to crack even when internal pressure is applied and can automatically return to its original shape.

[0023] Furthermore, since the concave rib 160 extends along the horizontal direction, it can elastically deform to release the internal pressure F along the horizontal direction, effectively absorbing the internal pressure F and then easily returning to its original shape. Although multiple concave ribs 160 are provided, this is not limited to this configuration, and only one concave rib 160 may be provided on the corner rib 150. However, providing multiple concave ribs 160 makes the entire corner rib 150 less prone to cracking and more easily returns to its original shape automatically.

[0024] Furthermore, as shown in Figure 3(a), when multiple recessed ribs 160 are provided, each recessed rib 160 is parallel to the others. Because each recessed rib 160 is parallel, they do not interfere with each other when they deform, and the elastic deformation and recovery of each recessed rib 160 are performed effectively. Note that although the recessed ribs 160 extend along the horizontal direction, they are not limited to this and may extend diagonally to the horizontal direction. Also, although each recessed rib 160 is parallel to the others, they are not limited to this and may not be parallel to each other.

[0025] Furthermore, as shown in Figure 2, each concave rib 160 is positioned along the inner surface 153 that slopes inward from the upper end 151 to the lower end 152 of the corner rib 150. Therefore, the concave rib 160 positioned on the upper side is located further outward than the concave rib 160 positioned on the lower side. As a result, the concave rib 160 located on the upper and outer side is further away from the bottom wall 110, and can deform more flexibly and larger outward, thereby effectively absorbing the internal pressure F and then more easily returning to its original shape.

[0026] Furthermore, as shown in Figure 3, an outwardly recessed auxiliary rib 170 is provided on the side wall 120 adjacent to the corner portion 140. One end 171 of this auxiliary rib 170 is connected to one end 161 or the other end 162 of the recessed rib 160, and the other end 172 of the auxiliary rib 170 is connected to the flat surface portion 121 of the side wall 120. In this way, since the auxiliary rib 170 is connected to the recessed rib 160, the auxiliary rib 170 can absorb a portion of the internal pressure F applied to the recessed rib 160 and assists the recessed rib 160 in returning to its original shape. In addition, since the end 172 of the auxiliary rib 170 is connected to the surface portion 121 of the side wall 120, the surface portion 121 can absorb a portion of the internal pressure F absorbed by the auxiliary rib 170 and assists the auxiliary rib 170 in returning to its original shape.

[0027] Furthermore, as shown in Figure 3, the auxiliary rib 170 extends diagonally to the horizontal in a side view from one end 171 to the other end 172. In other words, the auxiliary rib 170 extends in a different direction from the concave rib 160, which extends in the horizontal direction. Therefore, by supporting the concave rib 160, which elastically deforms in the horizontal direction, from a direction in which the auxiliary rib 170 intersects with it horizontally, the auxiliary rib 170 can firmly support the concave rib 160 to prevent damage and also more strongly assists in the restoration of the concave rib 160.

[0028] Furthermore, although the auxiliary rib 170 has a shape that is recessed outward, it is not limited to this and may also have a shape that protrudes inward. Also, the auxiliary rib 170 may have any shape as long as it can absorb a portion of the internal pressure F absorbed by the recessed rib 160 and can assist the recessed rib 160 in returning to its original shape.

[0029] Furthermore, the packaging container of the present invention is not limited to the above-described embodiments, and various modifications and combinations are possible within the scope of the claims and embodiments, and these modifications and combinations are also included within the scope of the patent rights.

Claims

1. A packaging container comprising a bottom wall, side walls rising from the bottom wall, and a corner portion between the side walls located at the corner of the bottom wall, The aforementioned corner section is provided with a corner rib that extends vertically and curves inward. A packaging container characterized in that the corner rib is provided with a curved concave rib that extends to both ends of the corner rib and along the inner surface of the corner rib.

2. The packaging container according to claim 1, characterized in that the recessed rib extends along the horizontal direction.

3. The packaging container according to claim 1 or 2, characterized in that a plurality of recessed ribs are provided, and the plurality of recessed ribs are parallel to each other.

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