Packaging container

Abstract

To provide a packaging container which can realize reduction in production cost and the prevention of environmental pollution and environmental destruction by reducing the thickness of the packaging container and reducing materials, and further setting a shape satisfying the strength performance to be required.SOLUTION: In a packaging container 1 of the present invention, a recessed storage space A is formed having an open upper part by continuously raising a peripheral wall part 13 from a peripheral edge part 2a of a bottom part 2. Each corner part 5 of the bottom part 2 is subjected to C face cutting, and each corner part 5 is provided with a corner part rib 12.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an environmentally friendly packaging container that uses less raw materials. [Background technology]

[0002] Packaging containers for storing various foods such as sweets and fruits are generally known to have a bottom and side walls that rise from the periphery of the bottom, and some have reinforcing ribs on the bottom and side walls to increase the strength of the packaging container. For example, Patent Documents 1 and 2 disclose a rectangular, bottomed packaging container for storing food, which has a bottom on which the food is placed and side walls that surround the food. They also disclose a reinforcing protrusion (rib) that protrudes from the inner surface toward the outer surface of the bottom of the packaging container. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-193089 [Patent Document 2] Design Registration No. 1621100 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in such packaging containers, simply forming many reinforcing ribs that protrude outward from the bottom to the sidewalls increases the strength of the packaging container, but at the same time, it gives consumers a sense of clutter and impairs the aesthetic appearance. Also, since the corners of the packaging container are sharp, there is a risk that the sheet will tear, so strength is sometimes increased by making the corners more curved and the sheet thicker. However, in recent years, there has been a need for further reductions in materials and material costs, as well as a desire to prevent environmental pollution caused by plastics and environmental destruction due to their disposal, so simply increasing the thickness is not possible.

[0005] Therefore, the applicant conducted various studies to meet these demands, and as a result, the applicant aimed to provide a packaging container that can protect food stored in the container in an attractive manner while reducing its weight, thereby reducing manufacturing costs and preventing environmental pollution and destruction, by reducing the thickness of the packaging container and reducing the amount of material used, while at the same time establishing a structure that meets the required strength performance. [Means for solving the problem]

[0006] In order to achieve this object, the first invention is a packaging container in which a concave storage space with an open top is formed by continuously raising a peripheral wall portion from the peripheral edge of the bottom, and the corners of the bottom are C-face cut. A second invention is characterized in that in the first invention, a corner rib is provided at the corner where the C-face cut is performed. The third invention is characterized in that, in the second invention, the outer surface of the bottom has a frame-shaped rib protruding inward from the peripheral edge of the bottom, and the corner ribs consist of a first corner rib, a second corner rib, and a third corner rib, the first corner rib is provided continuously from the frame-shaped rib protruding from the bottom to the lower edge of the step portion, the second corner rib and the third corner rib are each provided continuously from each peripheral wall rib on the bottom to the lower edge of the step portion, and the second corner rib and the third corner rib are arranged side by side at equal intervals from the first corner rib. The fourth invention is characterized in that, in any of the first to third inventions, the peripheral wall portion is composed of an expanding wall portion formed in a continuous, expanding shape outward from the peripheral edge of the bottom, a first peripheral wall portion formed in a continuous, expanding shape outward from the upper edge of the expanding wall portion, a step portion formed in a continuous, expanding shape outward from the upper edge of the first peripheral wall portion, a second peripheral wall portion formed in a continuous, expanding shape outward from the upper edge of the step portion, and peripheral wall ribs formed in a substantially L-shape continuous from the bottom to the second peripheral wall portion, and spaced apart in the circumferential direction. The fifth invention is characterized in that, in the fourth invention, the first peripheral wall portion and the second peripheral wall portion have a relationship of θ3<θ2, where θ3 is the expansion angle of the first peripheral wall portion and θ2 is the expansion angle of the second peripheral wall portion. The sixth invention is characterized in that, in the fifth invention, the first peripheral wall portion and the second peripheral wall portion have a positional relationship of h3>h2, where h3 is the length of the first peripheral wall portion and h2 is the length of the second peripheral wall portion. [Effects of the Invention]

[0007] According to the present invention, by reducing the thickness of the packaging container and saving material while setting a structure that meets the required strength performance, it is possible to provide a packaging container that protects food stored in the packaging container in an attractive manner while reducing its weight, thereby reducing manufacturing costs and preventing environmental pollution and destruction. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view of a packaging container according to the present invention, viewed from above. [Figure 2] 1 is a perspective view of a packaging container according to the present invention, viewed from below. [Figure 3A] 1 is a schematic side view of a packaging container according to the present invention. [Figure 3B] FIG. 3B is a partially enlarged schematic diagram of FIG. 3A. [Figure 4] FIG. 2 is a partially enlarged side view of the packaging container according to the present invention. [Figure 5] FIG. 2 is a partially enlarged view showing a rib at a corner of the wearing container according to the present invention. [Figure 6] FIG. 10 is a partially enlarged view of an example of embossing at the corners of the packaging container according to the present invention. [Figure 7] 10 is a partially enlarged view of another example of embossing at the corner of the packaging container according to the present invention. FIG. [Figure 8] 3 is a partially enlarged view showing a columnar rib at a corner of the packaging container according to the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] The present invention is intended for a cylindrical or polygonal packaging container, and as shown in Figure 1, a concave storage space A with an open top is formed by continuously raising a peripheral wall portion 3 from the peripheral edge portion 2a of a rectangular bottom portion 2 in a plan view. A plurality of protrusions are formed, protruding from the inner surface to the outer surface of the peripheral wall 3, from the outer surface of the bottom 2. By forming the protrusions in this way, it is possible to improve the strength of the peripheral edge 2a of the bottom 2. Furthermore, these protrusions are intended to be peripheral wall ribs 8 and corner ribs 12, which will be described later. Furthermore, this storage space is divided into a plurality of storage sections 4 by vertical partition walls 6 and horizontal partition walls 7. Food items such as pie pastries are stored in each storage section 4. In this embodiment, a packaging container having a rectangular shape in plan view as shown in the drawing is assumed, and will be described in detail with reference to the drawing.

[0010] The packaging container 1 in this embodiment has a vertically elongated rectangular (rectangular) shape in plan view with an open top (upper side), and the peripheral wall 3 is formed by continuously rising from the peripheral edge 2a of the rectangular bottom 2 in plan view of each storage section 4, forming a recessed storage space A with an open top, which is the peripheral wall 3 with a gently sloping inverted trapezoidal shape in side view and the rectangular bottom 2. In addition, the upper end of the peripheral wall 3 on the open side is folded back to form a bent portion. The width h4 of this bent portion is approximately 3 mm (see FIG. 4).

[0011] The peripheral wall portion 3 of each storage section 4 formed in the storage space A is formed in a stepped shape in a side view by an expanding wall portion 13 formed by continuously rising outward in an expanding shape from the peripheral edge portion 2a of the bottom 2, a first peripheral wall portion 3b formed by continuously rising through the expanding wall portion 13, a step portion 11 extending continuously outward from the upper edge of the first peripheral wall portion 3b, and a second peripheral wall portion 3a formed by continuously rising from the step portion 11.

[0012] The first peripheral wall portion 3b and the second peripheral wall portion 3a have a relationship of θ3<θ2, where θ3 is the expansion angle of the first peripheral wall portion 3b and θ2 is the expansion angle of the second peripheral wall portion 3a. In this embodiment, the inclination angle θ3 of the first peripheral wall portion 3b is approximately 3 degrees, and the inclination angle θ2 of the second peripheral wall portion 3a is approximately 5 degrees, so that the inclination of the first peripheral wall portion 3b is smaller (see FIG. 4). The step 11 is formed on the peripheral wall 3 of the storage section 4, which corresponds to the outer periphery of the packaging container 1, but is not formed on the peripheral wall 3 of the storage section 4 along the vertical partition wall 6. This is because the peripheral wall 3 of the storage section 4 along the vertical partition 6 is reinforced by the horizontal partition wall 7, and there is no need to provide a step thereon.

[0013] As a specific example, the size of the packaging container 1 is such that the peripheral wall 3 of the rectangular long side W1 is approximately 245 mm, the peripheral wall 3 of the short side W2 is approximately 210 mm, and the depth h is approximately 54 mm, but these sizes are not particularly limited. Furthermore, while the thickness of a conventional packaging container, taking into account the size and material, is approximately 0.33 mm, the packaging container of this embodiment can be further reduced to approximately 0.31 mm by the present invention. This thickness can be determined appropriately so as to obtain a predetermined strength depending on the size and material of the packaging container.

[0014] The packaging container 1 is fabricated by integrally molding the peripheral wall 3, bottom 2, and vertical and horizontal partition walls 6, 7, all of which have substantially the same thickness (plate thickness), using a mold to form a synthetic resin sheet such as polystyrene resin (PS). The material for the packaging container 1 of this embodiment may be any thermoplastic transparent resin that can be vacuum-formed. In addition to polystyrene resin, various synthetic resins such as polyethylene, polyethylene terephthalate, amorphous polyethylene terephthalate, polypropylene, and polyvinyl chloride may also be used. These synthetic resins may also be blended with additives such as fillers, pigments, plasticizers, antioxidants, and lubricants.

[0015] The storage space A is provided with vertical partition wall 6 that rises high from the bottom 2 and horizontal partition wall 7 that rises low from the bottom 2 and crosses the vertical partition wall 6 in a cross shape, and six compartments are formed as rectangular recessed storage sections 4 defined by these vertical partition wall 6 and horizontal partition wall 7. That is, one vertical partition wall 6 extending in the long side direction of the packaging container 1 and two horizontal partition walls 7 extending in the short side direction divide the space into six storage sections 4 in two columns and three rows. Each storage section 4 is rectangular with a short side length of approximately 750 mm and a long side length of approximately 900 mm. Furthermore, the vertical partition walls 6 and horizontal partition walls 7 are arranged in a matrix to prevent the sweets stored in the storage section 4 from shifting within the packaging bag and also function as a reinforcing means.

[0016] Furthermore, the vertical partition wall 6 has a predetermined thickness, and two notches 6a and 6b that are inverted trapezoidal in side view are formed at the position where it intersects with the horizontal partition wall 7. These notches 6a and 6b are recessed approximately 28 mm from the upper end surface of the peripheral wall 3 of the packaging container toward the bottom surface 2. This notch notches the vertical partition wall 6 and makes it easier to grab the snacks stored in the storage section 4 with your hands.

[0017] 1, 2, and 4, the storage section 4 is formed with a plurality of peripheral wall ribs 8 at desired intervals in the circumferential direction, and the peripheral wall ribs 8 are formed in a generally L-shape that continues from the peripheral edge 2a of the bottom 2 to the upper edge of the peripheral wall 3 (hereinafter, the generally L-shaped ribs will also be referred to as "generally L-shaped ribs"). Such generally L-shaped peripheral wall ribs 8 are provided to increase the rigidity and strength of the peripheral wall 3 of the packaging container without increasing the thickness thereof, and to prevent deformation such as warping and twisting of the packaging container having a wide flat portion of the bottom 2. In other words, they are reinforced by providing irregularities on the peripheral wall 3 and the peripheral edge 2a of the bottom 2.

[0018] Specifically, the corners 5 of the storage section 4 are arc-shaped in a plan view and rise outward from the peripheral edge 2a of the bottom 2 (the upper end side is tapered so that it is wider than the lower end side), and on all four sides (all around) of the peripheral wall 3 there are approximately L-shaped peripheral wall ribs 8 that extend from the upper end surface of the peripheral wall 3 to the peripheral edge 2a of the bottom 2.

[0019] As shown in Figures 1 and 2, the peripheral wall ribs 8 are formed with narrowly spaced ribs along the vertical partition wall 6 and the peripheral wall 3, and with widely spaced ribs along the horizontal partition wall 7. For example, in comparison with the applicant's conventional packaging container, if the conventional wide rib spacing S is 5 mm, the narrow rib spacing S is as narrow as 2 mm and the depth is 0.8 mm. Even with these narrow rib spacings S, it is sufficient as long as they are formed to a limit that does not impair the cluttered aesthetic appearance. For example, it is possible to provide a packaging container 1 in which the rib spacing S of the generally L-shaped peripheral wall ribs 8 is wider than conventional ones. Specifically, the rib spacing S can be slightly wider, at 3 mm.

[0020] It can be said that using ribs with such wide rib spacing S would weaken the overall strength of the packaging container 1, but the packaging container 1 of the present invention has a stepped portion 11 formed on the peripheral wall portion 3, and meets the strength performance required of a packaging container.

[0021] The size of these approximately L-shaped peripheral ribs 8 is not particularly limited and varies depending on the size of the packaging container 1. The cross-sectional shape of the approximately L-shaped peripheral ribs 8 may be rectangular, arc-shaped, V-shaped, or the like.

[0022] In addition, in the packaging container 1 of this embodiment, some of the storage sections 4 divided into a plurality of sections have, in side view, raised bottom sections 9 that are mountain-shaped and inclined upward from the bottom 2 toward the vertical partitions 6. For example, as shown in Figures 1 and 2, three of the six storage sections 4 have raised bottom sections 9 formed therein.

[0023] The raised bottom portions 9 are provided to adjust the total number of food items stored. For example, if the packaging container 1 can hold a total of nine items and has six storage sections 4, this can be solved by storing two food items in three of the flat storage sections 4 without the raised bottom portions 9, and placing the remaining three food items in the three storage sections 4 with the raised bottom portions 9. Furthermore, in order to balance the weight of the food items in the packaging container 1, the raised bottom portions 9 are arranged so that they are not biased to one side. Furthermore, the height of the peaks is approximately 23 mm from the bottom 2, so that when snacks are stored in the storage section 4, the height is approximately the same as the height of the snacks stored in the other storage sections 4 without the raised bottom portions 9.

[0024] The raised bottom portion 9 makes the food storage look good and allows the number of stored items to be adjusted. Furthermore, the raised bottom portion 9 ensures the strength of the packaging container even with a flat bottom 2.

[0025] 1 and 4, in order to reduce the thickness of the peripheral wall 3 of the packaging container 1 while satisfying the required strength performance, the peripheral wall 3 is formed in a stepped shape in a side view, with a first peripheral wall 3b formed to rise continuously from the peripheral edge 2a of the bottom 2, a step portion 11 formed to extend continuously outward from the upper edge of the first peripheral wall 3b, and a second peripheral wall 3 formed to rise continuously from the step portion 11. In other words, one step-shaped step portion 11 is provided on each of the four sides (entire periphery) of the peripheral wall 3.

[0026] 4, the peripheral wall 3 extends downward from the first peripheral wall 3b to the second peripheral wall 3a, forming a sloped flat surface with a width h5 of a step 11, and the step 11 between the first peripheral wall 3b and the second peripheral wall 3a is located at a position where the length h3 from the upper end of the peripheral wall 3 is approximately 28 mm and the length h2 from the bottom 2 is approximately 22 mm. In this embodiment, the first peripheral wall 3b and the second peripheral wall 3a have a positional relationship of h3 > h2, where h3 is the length of the first peripheral wall 3b and h2 is the length of the second peripheral wall 3a. Further, the step width h5 between the first peripheral wall portion 3 and the second peripheral wall portion 3 is formed as a flat surface inclined at an angle of approximately 90 degrees, with a difference d being approximately 1 mm downward toward the accommodation chamber side. The difference d in the step width is not particularly limited, but is preferably about 1 mm to 2 mm.

[0027] This makes it possible to strengthen the peripheral wall of the packaging container 1 even if the thickness of the peripheral wall part 3 is reduced, and also gives a good impression of neat appearance since it is not complicated with multiple step parts 11.

[0028] Furthermore, in the case of a conventional packaging container without step portions 11, in order to improve the appearance of the four corners 5 of the storage section 4, the corners 5, which are a plurality of convex shapes that reinforce the boundary region B between the bottom 2 and the peripheral wall 3, are formed by arcs with a smaller radius than the corners 5. The reason why the corners 5 are made arc-shaped is because pressure is concentrated at sharp corners 5, which may tear the sheet. However, simply reducing the thickness of the packaging container poses a problem in that the strength of the corners 5 in particular is weakened, resulting in a crushed feeling.

[0029] In contrast, the packaging container 1 of this embodiment has C-face cuts on the corners of the bottom 2. C-face cuts refer to chamfering in which the corners 5 are cut linearly, as shown in Figures 3 and 4, and the cut angle θ1 is approximately 45 degrees. Corner ribs 12 are provided at the C-cut corners 5. The outer surface of the bottom 2 has a frame-shaped rib 2b that protrudes inward from the bottom peripheral edge 2a, and the corner ribs 12 consist of a first corner rib 12a, a second corner rib 12b, and a third corner rib 12c.

[0030] The first corner rib 12a is provided continuously from the frame-shaped rib 2b protruding from the bottom 2 to the lower edge of the step portion 11. The second corner rib 12b and the third corner rib 2c are each provided continuously from each peripheral wall rib on the bottom 2 to the lower edge of the step portion 11. The second corner rib 12b and the third corner rib 12c are also provided parallel to the first corner rib 12c at equal intervals. In other words, the second corner rib 12b and the third corner rib 12c are provided parallel to the first corner rib 12a at equal intervals.

[0031] This is because even if the thickness of the corners 5 is reduced, the corners 5 of the bottom 2 are C-cut and further strengthened by processing and forming corner ribs 12 on top of that. With this configuration, the strength of the corners 5 is not reduced without changing the weight of the packaging container itself, and the appearance as seen by consumers is not impaired. In other words, the rigidity of the corners 5 can be increased, thereby increasing the rigidity of the bottom 2, while maintaining the degree of freedom in designing the packaging container. This will be explained in detail below.

[0032] At the C-face cut corners 5, convex portions consisting of ribs or embossments are processed and formed on the surfaces of the corners 5 as a reinforcing structure for the bottom 2 and the corners 5. The ribs or embossments are formed by processing using a mold (male mold) at the same time as the C-face cutting of the corners 5. As for the types of concave-convex designs that can be created by the concave-convex patterns formed by processing, it is possible to perform processing in which multiple circular, rectangular, diamond, and other patterns are scattered. This allows for a highly designed packaging container with a three-dimensional feel and a sense of depth, with the concave-convex patterns at the corners 5.

[0033] In this embodiment, the rib processing and formation is achieved simultaneously with the C-face cutting of the corner 5. However, in the case of a packaging container in which the arc-shaped corner 5 without C-face cutting is thin or in which a material with low strength is used, the corner 5 can be further protected by processing and forming the rib of the present invention.

[0034] The corner rib may also be formed in an embossed shape, as shown in Figures 6 and 7, and these are also within the scope of the present invention. The embossed corner rib in Figure 6 will be referred to as corner rib 14, and the embossed corner rib in Figure 7 will be referred to as corner rib 15. Corner rib 14 is an example of an embossment (also called a dimple) with small squares scattered throughout. Corner rib 15 is an example of a regular hexagonal honeycomb embossment. Note that the surface is made uneven because creating holes during processing would actually weaken the strength. Furthermore, when processing and forming such embossments, it is preferable to form them so as to cover the curved surface of corner 5 from the standpoint of strength, and the depth of the recesses in the uneven pattern is preferably 20 μm or more.

[0035] It is sufficient that such corner ribs 12, 14, 15 are formed by forming a C-face cut in at least one of the corners 5 of the packaging container 1 and the storage section 4, and processing and forming the corner ribs 12, 14, 15 on the C-face cut. The corner ribs 12, 14, 15 are processed and formed on the four corners 5 of the packaging container 1 and the same corners 5 of the storage section 4, and on the corners 5 of the storage section 4 on the short side of the packaging container 1. In addition, there are cases where the corner ribs 12 and embossments 14, 15 are not formed on all of the four corners 5 of the bottom 2 of the packaging container 1, and the reason why ribs are not required on all corners 5 is that it is sufficient to reinforce only the corners 5 that require protective strength. The corners 5 of the bottom 2 of the packaging container 1 or the storage section 4 are also the portions where the peripheral wall 3 and the bottom 2 intersect, and where the peripheral wall 3 and the peripheral wall 3 intersect.

[0036] As explained above, even if the overall thickness of the packaging container 1 is reduced to reduce raw materials, the strength of the peripheral wall 3, corners 5 and bottom 2 of the packaging container 1 can be maintained by (1) forming a thin, approximately L-shaped peripheral wall rib 8 on the peripheral wall 3, (2) forming a step portion 11 that goes around the peripheral wall rib 8, (3) forming a C-shaped cut on the corner 5 of the storage section 4, and (5) forming a corner rib 12 on the C-shaped cut.

[0037] 1 and a partially enlarged view 8, the packaging container 1 of this embodiment has semicircular columnar ribs 10 formed in a convex shape on the inside of the peripheral wall 3, the columnar ribs 10 having a semicircular shape in a plan view and extending from near the upper end of the peripheral wall 3 to the peripheral edge 2a of the bottom 2, and the columnar ribs 10 are formed at four locations, two on each of the two shorter sides of the peripheral wall 3, at asymmetrical positions viewed from the center point of the packaging container 1. Of these, two columnar ribs 10 are provided near the corners 5 on the peripheral wall 3 and two near the vertical partitions 6. Here, the columnar rib 10 is the third rib, and to clarify this, in the description of this embodiment, the approximately L-shaped peripheral wall rib 8 of the peripheral wall portion 3 will be referred to as the first rib, the approximately L-shaped rib of the corner portion 5 will be referred to as the second rib, and the columnar rib 10 will also be referred to as the third rib.

[0038] The columnar rib 10, which is semicircular in plan view, is formed flush with the upper end surface of the peripheral wall 3. However, as shown in Fig. 8, the diameter of the semicircle at the bottom 2 may be slightly smaller than the diameter of the semicircle near the upper end surface of the peripheral wall 3, and the upper surface of the semicircle near the upper end of the peripheral wall 3 may also be inclined toward the inside of the storage section 4.

[0039] While the approximately L-shaped rib is a rib intended to reinforce the peripheral wall portion 3 like a normal rib, the columnar rib 10 not only functions as a reinforcing means for the packaging container 1 itself, but also functions as a support means for supporting or carrying the upper container from below when another packaging container 1 of the same type containing soft foodstuffs such as sweets is stacked on top of it.

[0040] In this way, the upper packaging container is supported by the columnar ribs 10 of the lower packaging container, so the weight of the upper packaging container is not applied to the food in the lower packaging container. Therefore, even if many packaging containers containing food are packed in multiple layers in a transport case or the like, the food in each packaging container will not be damaged or crushed.

[0041] 1, the columnar ribs 10 are installed at asymmetrical positions when viewed from the center point of the packaging container 1 in a plan view, so that when the upper and lower packaging containers are turned 180 degrees and placed on top of each other, the columnar ribs 10 on the peripheral wall 3 of the lower packaging container and the columnar ribs 10 on the peripheral wall 3 of the upper packaging container do not face each other and are therefore stacked. As a result, by stacking unused packaging containers in multiple layers, a large number of packaging containers can be delivered efficiently and storage space can be saved.

[0042] The present invention is not limited to the embodiments described above, and it is natural that various modifications and alterations to the packaging container are possible within the scope of the technical concept of the present invention described in the claims.

[0043] As described above, the present invention plays an important role in packaging containers for confectionery, in maximizing the appeal of the product stored in the storage space and protecting the product during transportation, but there are a wide variety of packaging containers on the market, and selecting the most suitable packaging container for a product can be difficult. In other words, the shape of the packaging container plays a very important role in selecting a packaging container, in terms of the importance of strength, environmental protection through material reduction, and cost reduction.

[0044] Furthermore, since confectionery packaging containers are picked up and checked for their shape and structure during trade, the appearance of the container from all sides, including the top, sides, and back, is extremely important for product identification. In particular, the shape of the sides and back of a confectionery packaging container is one of the shapes that is considered important depending on the product (confectionery) stored in the storage space. In other words, for soft confectionery, the shape of the confectionery must be able to be delivered safely to the end consumer without damaging the confectionery's shape.

[0045] In recent years, with commodity prices on the rise, as mentioned above, an important point to consider when selecting a product (packaging container) is whether it has a shape that can protect the environment and reduce costs by reducing the amount of material used, while improving (or maintaining) its strength. Inventors consider these various points when inventing products (packaging containers), and therefore also pay attention to the external appearance of the sides, bottom, etc. of the product (packaging container). [Industrial Applicability]

[0046] The present invention can also be used as a packaging container for foods other than confectionery foods. [Explanation of symbols]

[0047] 1 Packaging container 2 bottom 3 Peripheral wall part 4 Storage area 5 Corner 6 Vertical partition wall 7 Horizontal partition wall 8 Peripheral rib 9 Raised bottom 10 Column Rib 11 Step 12 Corner rib 13 Expansion wall 14, 15 Emboss A. Storage space B Boundary area

Claims

1. A packaging container having a recessed storage space with an open top formed by continuously raising a peripheral wall portion from the peripheral edge of the bottom portion, A packaging container characterized in that the corners of the bottom are C-cut.

2. 2. The packaging container according to claim 1, wherein a corner rib is provided at the corner where the C-face cut is performed.

3. The outer surface of the bottom portion has a frame-shaped rib that protrudes inward from the bottom peripheral edge portion, the corner ribs include a first corner rib, a second corner rib, and a third corner rib; the first corner rib is provided continuously from the frame-shaped rib protruding from the bottom portion to a lower edge of the step portion, The second corner rib and the third corner rib are each provided continuously from each peripheral wall rib at the bottom to a lower edge of the step portion, 3. The packaging container according to claim 2, wherein the second corner rib and the third corner rib are arranged in parallel with the first corner rib at equal intervals.

4. The peripheral wall portion includes an expanding wall portion formed by continuously extending upward from the peripheral edge of the bottom portion toward the outside in an expanding shape; a first peripheral wall portion formed by continuously rising from an upper edge of the expanding wall portion toward the outside in an expanding shape; a step portion formed by continuously rising from an upper edge of the first peripheral wall portion in an expanding manner outward; a second peripheral wall portion formed by continuously rising from an upper edge of the step portion in an expanding manner outward; A packaging container as described in any one of claims 1 to 3, characterized in that it is composed of a plurality of peripheral wall ribs formed in an approximately L-shape that continues from the bottom portion to the second peripheral wall portion and that are spaced apart in the circumferential direction.

5. The packaging container according to claim 4, characterized in that the first peripheral wall portion and the second peripheral wall portion have a relationship of θ3 < θ2, where θ3 is the expansion angle of the first peripheral wall portion and θ2 is the expansion angle of the second peripheral wall portion.

6. The packaging container according to claim 5, characterized in that the first peripheral wall portion and the second peripheral wall portion have a positional relationship of h3 > h2, where h3 is the length of the first peripheral wall portion and h2 is the length of the second peripheral wall portion.

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