Packaging container and method for compressing packaging container

Abstract

To provide a packaging container that achieves an excellent appearance, does not reduce volume unnecessarily, and can easily collapse a container body.SOLUTION: A packaging container 1 has a substantially equilateral triangular bottom part 3, a circular opening 11, and a side part 5 which gradually narrows from the opening 11 toward the bottom part 3. The container has a shape that changes three-dimensionally from a circle to a triangle, with a focusing column part 10 formed near a corner part 4 of the bottom part 3.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a packaging container and a method for compressing a packaging container. [Background technology]

[0002] Traditionally, salads and prepared foods have been sold in supermarkets and other stores, and displayed in plastic containers. Generally, it is desirable that plastic containers can be crushed to reduce bulk when discarded. Examples of such containers include the resin molded product described in Patent Document 1 below (hereinafter referred to as "Public Document 1 Invention") and the packaging container described in Patent Document 2 below (hereinafter referred to as "Public Document 2 Invention").

[0003] In the invention described in prior art document 1, a recess called a push-up column is formed at the lower part of the side surface of the container, and this recess is the trigger that causes the container body to begin to collapse. Similarly, in the invention described in prior art document 2, a recess is formed at the lower part of the side surface of the container, and this recess is the trigger that causes the container to begin to collapse. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Patent No. 5431822 [Patent Document 2] Patent No. 4496468 [Overview of the project] [Problems that the invention aims to solve]

[0005] However, both the inventions in Public Document 1 and Public Document 2 involve the formation of indentations on the sides of the container, raising concerns that this may give users the impression that the appearance is compromised. Furthermore, since the primary function of a container is to hold its contents, a shape that reduces the volume or makes it difficult to remove the contents lacks the essence of a container. Indentations on the sides unnecessarily reduce the volume of the container and can trap the contents, making them difficult to remove. In other words, the inventions in Public Document 1 and Public Document 2 are overly focused on structures that crush the container, raising concerns that they may give users the impression that the container lacks aesthetic appeal and the essence of a container.

[0006] This invention was proposed in view of the above circumstances. Specifically, it aims to provide a packaging container that achieves an excellent appearance, does not unnecessarily reduce the volume, and allows the container body to be easily crushed. [Means for solving the problem]

[0007] To achieve the above objective, the packaging container according to the present invention has a container body having a bottom portion, a side portion rising from the periphery of the bottom portion, and an opening formed at the upper end of the side portion, characterized in that, in a plan view, the bottom portion is triangular, and the opening is formed by a curve with a larger radius of curvature than the corner of the triangle in the bottom portion.

[0008] The packaging container according to the present invention is characterized in that the ratio of the area of ​​the bottom surface to the area of ​​the opening is 1:2 to 1:10.

[0009] The packaging container according to the present invention is characterized in that a plurality of indentations and protrusions are formed on the side surface.

[0010] The packaging container according to the present invention has a lid that can be attached to and removed from the opening, and the lid and the opening are fitted together with an external force weaker than the external force used to crush the container body in the depth direction. In other words, the method for compressing the packaging container according to the present invention is characterized by fitting the lid-side fitting portion to the body-side fitting portion with an external force weaker than the external force used to crush the container body in the depth direction.

[0011] The method for compressing a packaging container according to the present invention is characterized by including the steps of: placing the lid over the opening; crushing the container body by pushing the lid toward the bottom; and pushing the bottom toward the lid while the container body is in a crushed state. [Effects of the Invention]

[0012] The packaging container according to the present invention has a container body having a bottom surface, side surfaces rising from the periphery of the bottom surface, and an opening formed at the upper end of the side surfaces. In a plan view, the bottom surface is triangular, and the opening is formed by a curve with a larger radius of curvature than the corners of the triangle in the bottom surface. For example, if the opening formed by a predetermined curve is circular, the side surface will change shape three-dimensionally from circular to triangular from the opening to the bottom surface. Therefore, in a plan view, the shape of the side surface will gradually converge from the vicinity of the opening, where the radius of curvature is large, to the three corners of the bottom surface, where the radius of curvature is small. When an external force from above is applied to the opening of the container body, it will be crushed between the container body and the mounting surface. The stress in the side surface will be distributed near the opening, where the radius of curvature is large, but will concentrate in the areas with small radii of curvature. Consequently, the side surface will gradually buckle from the bottom surface side, where the stress is concentrated, toward the opening side, and the container body will collapse and become flattened. As described above, the container body is easily crushed. Furthermore, since the present invention does not have a structure with bumps or ridges that function when the container body is crushed, it has a superior appearance and the volume is not unnecessarily reduced. However, if both the opening and the bottom surface were rectangular, the four corners would become columnar from the opening to the bottom surface, making the container body less likely to be crushed.

[0013] The packaging container according to the present invention has a ratio of the area of the bottom portion to the area of the opening portion of 1:2 to 1:10. That is, if the area of the bottom portion relative to the area of the opening portion is a predetermined ratio, even when the external force is relatively weak, the pressure applied to the container body becomes strong, so the container body is easily crushed.

[0014] The packaging container according to the present invention has a plurality of concavo-convex portions formed on the side surface portion. With this configuration, the side surface portion becomes firm and the container body is difficult to be crushed. On the other hand, when the container body after use is crushed when being discarded, the concavo-convex portions promote plastic deformation, so the container body is difficult to return to its original state.

[0015] The packaging container according to the present invention has a lid that is attached to and detached from the opening portion, and the lid and the opening portion are fitted with an external force weaker than the external force when crushing the container body in the depth direction. Therefore, when the user covers the container body with the lid, the container body is not accidentally crushed.

[0016] The compression method of the packaging container according to the present invention includes a procedure of covering the opening portion with a lid, a procedure of crushing the container body by pushing the lid toward the bottom portion, and a procedure of pushing up the bottom portion toward the lid in a state where the container body is crushed. Therefore, the thickness of the crushed container body becomes thinner, and the container body maintains its crushed state and becomes difficult to return to its original state.

Brief Description of the Drawings

[0017] [Figure 1] FIG. 1 is an exploded perspective view showing the packaging container according to an embodiment of the present invention disassembled. [Figure 2] FIG. 2 is a plan view showing the container body of the packaging container according to an embodiment of the present invention. [Figure 3] FIG. 3 is a side view showing the container body of the packaging container according to an embodiment of the present invention. [Figure 4] FIG. 4 is a cross section taken along line IV-IV of FIG. 2, and is a longitudinal cross-sectional view showing the longitudinal cross section of the container body of the packaging container according to an embodiment of the present invention. [Figure 5] Figure 5 is a plan view showing a lid used in a packaging container according to an embodiment of the present invention. [Figure 6] Figure 6 is a longitudinal cross-sectional view of the VI-VI section of Figure 5, showing a longitudinal section of a lid used in a packaging container according to an embodiment of the present invention. [Figure 7] Figure 7 is an enlarged vertical cross-sectional view showing a packaging container according to an embodiment of the present invention, with the lid attached to the container body. [Modes for carrying out the invention]

[0018] The following is a description of a packaging container according to an embodiment of the present invention. This embodiment will be described below with reference to the drawings. Figure 1 shows the external appearance of the packaging container 1.

[0019] As shown in Figure 1, the packaging container 1 consists of a container body 2, which is a vessel for containing contents (not shown), and a lid 18 for covering the contents. The contents include not only prepared foods but also fresh produce such as fruits, vegetables, fresh fish, and fresh meat. The container body 2 has a bottom portion 3, a side portion 5 that rises from the periphery of the bottom portion 3, and an opening 11 formed at the upper end of the side portion 5. The opening 11 has a body-side fitting portion 12 that fits when the lid 18 is attached or removed. On the other hand, the lid 18 has a top plate portion 19 and a lid-side fitting portion 22 formed on the periphery of the top plate portion 19 that fits with the body-side fitting portion 12. When the lid 18 is attached to the container body 2, the lid-side fitting portion 22 covers the outside of the body-side fitting portion 12, so the packaging container 1 is a so-called external fitting type.

[0020] The materials of the container body 2 and the lid 18 are plastics, such as polyester resins like polyethylene terephthalate (PET), olefin resins like polypropylene (PP), etc. The container body 2 and the lid 18 are both formed by methods such as vacuum forming, hot plate pressure air forming, vacuum pressure air forming, double-sided vacuum forming, etc. The thickness of the synthetic resin sheet before forming is, for example, 0.19 to 0.6 millimeters, preferably 0.21 to 0.5 millimeters, and more preferably 0.23 to 0.35 millimeters. Note that the container body 2 and the lid 18 are transparent, but they may also be translucent or colored.

[0021] Here, the container body 2 will be described in detail based on the drawings. In FIGS. 2 to 4, the appearance, cross-section, and an enlarged part of the container body 2 are shown.

[0022] As shown in FIGS. 2 to 4, in plan view (see FIG. 2), the bottom surface portion 3 is substantially an equilateral triangle. Here, the corner portions 4, which are the three vertices of the triangle, are rounded to such an extent that the radius of curvature can be conceived in plan view. In other words, the corner portions 4 are not sharp. Specifically, the radius of curvature R B of the corner portion 4 B is R B ≦ 20 millimeters. Preferably, the radius of curvature R B of the corner portion 4 is R B ≦ 15 millimeters, R

[0023] [[ID=二十一]] [[ID=二十二]]≦ 10 millimeters. B In plan view (see FIG. 2), the opening 11 is circular and includes a curve with a radius of curvature R T larger than the radius of curvature R B of the corner portion 4. That is, R T < R T , and specifically, the radius of curvature R T of the opening 11 is 20 < R T . Preferably, 40 < R T .

[0024] The fitting portion 12 on the main body side of the opening 11 is an annular flange. The fitting portion 12 on the main body side has three inwardly recessed notches 13 formed therein. The notches 13 are arranged at equal intervals on the circumference. The sum of the lengths of the three notches 13 accounts for 20 to 50 percent of the circumference of the opening 11. More preferably, it accounts for 22 to 40 percent, and even more preferably, 25 to 35 percent.

[0025] As shown in Figure 4, the main body fitting portion 12 has a flange base portion 14 connected to the upper end of the side portion 5, a flange portion 15 connected to the flange base portion 14 and extending outward from the opening 11, a flange tip portion 16 connected to the tip of the flange portion 15 and extending outward from the opening 11, and a flange tip portion 17 connected to the tip of the flange tip portion 16. The flange base portion 14 extends outward and diagonally upward from the upper end of the side portion 5. The flange portion 15 extends horizontally. The angle of the flange base portion 14 with respect to the flange portion 15 is approximately 45 degrees. The flange tip portion 16 extends outward and diagonally downward from the flange portion 15. The angle θ of the flange tip portion 16 with respect to the flange portion 15 F The temperature is between 10 degrees and 45 degrees, preferably between 15 degrees and 40 degrees, and more preferably between 25 degrees and 35 degrees.

[0026] The opening 11 is larger than the bottom surface 3. Therefore, the side surface 5 gradually narrows from the opening 11 towards the bottom surface 3, forming a mortar-shaped or funnel-shaped structure. The side surface 5 is composed of four sections in the depth direction, and has an upper section 6 connected to the opening 11, a first middle section 7 connected to the lower part of the upper section 6, a second middle section 8 connected to the lower part of the first middle section 7, and a lower section 9 connected to the lower part of the second middle section 8. The lower section 9 is connected to the bottom surface 3. The volume of the side surface 5 gradually decreases from the upper section 6 to the lower section 9.

[0027] Since the opening 11 is circular and the base portion 3 is triangular, the side portion 5 has a shape that changes three-dimensionally from circular to triangular from the upper portion 6 to the lower portion 9, between the opening 11 and the base portion 3. In plan view, the shape of the side portion 5 gradually converges from the vicinity of the opening 11, where the radius of curvature is larger than that of the corners 4 of the base portion 3, towards the base portion 3, to the three corners 4, where the radius of curvature is smaller than that of the opening 11. Therefore, the converged column portion 10 is formed from the lower portion 9 to the corners 4, from the second middle portion 8 to the corners 4, or from the first middle portion 7 to the corners 4.

[0028] The side surface 5 has been diamond-cut, creating multiple indentations and protrusions. More specifically, each of the stepped sections 6, 7, 8, and 9 on the side surface 5 is cut in such a way that multiple triangular surfaces are arranged in the circumferential direction.

[0029] The ratio of the area of ​​the bottom portion 3 to the area of ​​the opening 11 is 1:2 to 1:10, preferably 1:2.5 to 1:8, and more preferably 1:3 to 1:5. The ratio of the height of the container body 2 to the area of ​​the opening 11 is 1:12 to 1:50, preferably 1:15 to 1:45, and more preferably 1:20 to 1:35. The ratio of the height of the container body 2 to the area of ​​the bottom portion 3 is 1:4 to 1:10, preferably 1:5 to 1:9, and more preferably 1:6 to 1:8.

[0030] The depth (vertical distance) of each step portion 6, 7, 8, 9 on the side portion 5 is 7 to 25 millimeters, preferably 8 to 20 millimeters, and more preferably 9.5 to 16.5 millimeters. The number of steps (number of boundaries between each step portion 6, 7, 8, 9) is 2 to 5, preferably 2 to 4, and more preferably 3 as in this embodiment.

[0031] Next, the lid 18 will be described in detail based on the drawings. Figures 5 and 6 show the external appearance, cross-section, and enlarged portion of the lid 18.

[0032] As shown in Figure 5 or 6, in plan view (see Figure 5), the lid 18 is circular, following the shape of the opening 11 of the container body 2. The top plate portion 19 of the lid 18 has a disc-shaped flat portion 20 and a raised portion 21 connected to the periphery of the flat portion 20. The raised portion 21 is annular, rising from the flat portion 20. The lid-side fitting portion 22 is annular, and in side view (see Figure 6), has a recessed fitting portion 23 connected to the periphery of the raised portion 21 and an under portion 24 connected to the lower part of the recess 23. The recess 23 protrudes outward from the raised portion 21 toward the top plate portion 19, while the under portion 24 protrudes inward from the recess 23 toward the top plate portion 19. Of the circumference of the lid 18, the length of the under portion 24 accounts for 50 to 99 percent of the circumference of the lid-side fitting portion 22. More preferably, it accounts for 75 to 90 percent, and even more preferably, 93 to 96 percent. The under portion 24 has four recesses 25 formed therein for demolding (see Figure 5). The recesses 25 are arranged at equal intervals on the circumference. Therefore, the entire circumference of the lid-side fitting portion 22, excluding the recesses 25, is the under portion 24.

[0033] The inner dimensions S of the lid-side fitting portion 22 based on the pocket 23. I (See Figure 6) The outer dimensions S of the fitting portion 12 on the body side are based on the tip 17 of the flange of the container body 2. O It is formed to be smaller than (see Figure 4), with an internal dimension S I Outer dimensions S O The difference in diameter is 0.25 millimeters or more and 2 millimeters or less. More preferably, it is 1 millimeter or less, and even more preferably, 0.8 millimeters or less. In other words, the difference between the circumference of the lid-side fitting portion 22 with respect to the cavity 23 and the circumference of the body-side fitting portion 12 with respect to the flange tip 17 is 1.5 millimeters or more and 2.8 millimeters or less, and more preferably, 1.9 millimeters or more and 2.5 millimeters or less.

[0034] As described above, the container body 2 and lid 18 are fitted together to form the packaging container 1. Here, the fitting of the container body 2 and lid 18 will be explained along with the operation and effects of this embodiment. Figure 7 shows an enlarged view of a part of the cross-section in the state in which the container body 2 and lid 18 are fitted together.

[0035] When the lid 18 is attached to the container body 2, the lid-side fitting portion 22 rests on the body-side fitting portion 12. Specifically, in Figure 7, the underside 24 of the lid-side fitting portion 22 contacts the flange portion 15 or the flange tip portion 16 of the body-side fitting portion 12. When an external force is applied to the lid 18 from above, the flange tip portion 16 is pushed downward and bends. Since the flange tip portion 16 is gently inclined with respect to the flange portion 15 and extends outward, it bends well. Therefore, even with a relatively weak external force, the lid-side fitting portion 22 and the body-side fitting portion 12 can easily fit together.

[0036] The flange tip 16 bends downward and inward when pushed from the under 24, making it easy for the lid-side fitting portion 22 and the body-side fitting portion 12 to engage even with a relatively weak external force. When the flange tip 16 moves over the under 24 and into the cavity 23, it is repelled from its downward-bent state at the moment it moves over the under 24 and collides with the cavity 23. The impact at that time is transmitted to the hand of the user applying the external force. Therefore, the user can intuitively perceive the engagement between the lid-side fitting portion 22 and the body-side fitting portion 12.

[0037] Since the length of the under portion 24 accounts for at least 50 to 99 percent of the circumference of the lid-side fitting portion 22 of the circumference of the lid 18, the lid-side fitting portion 22 is easily deformed even by relatively weak external forces and easily fits with the main body-side fitting portion 12.

[0038] The main body fitting portion 12 has three inwardly recessed notches 13 (see Figure 2). When the main body fitting portion 12 and the lid fitting portion 22 are fitted together, the notches 13 are separated from the lid fitting portion 22. The notches 13 create a gap between the main body fitting portion 12 and the lid fitting portion 22, and since they do not fit together in this gap, the fitting area is narrowed by the amount of the gap. Therefore, even with a relatively weak external force, the lid fitting portion 22 and the main body fitting portion 12 can be easily fitted together. Furthermore, since the notches 13 occupy at least 20 to 50 percent of the circumference of the opening 11 (see Figure 2), the lid fitting portion 22 is easily deformed, and the lid fitting portion 22 and the main body fitting portion 12 can be easily fitted together.

[0039] Furthermore, since the main body side fitting portion 12 and the lid side fitting portion 22 are annular (see Figure 1), they are easily flexible, making it easy for the lid side fitting portion 22 and the main body side fitting portion 12 to engage even with relatively weak external forces.

[0040] Since the packaging container 1 is formed by stretching a synthetic resin sheet with a thickness of at least 0.19 to 0.6 millimeters during the molding process, it is sufficiently thin, allowing the container body 2 and lid 18 to flex well. Therefore, even with relatively weak external forces, the lid-side fitting portion 22 and the body-side fitting portion 12 are easily deformed and can be easily fitted together.

[0041] On the other hand, the side surface 5 of the container body 2 is robust due to multiple indentations created by the diamond cut (see Figure 1), so the container body 2 is less likely to be crushed when the lid 18 is attached to it. Furthermore, when light from lighting or other sources is captured by the diamond cut, it can enhance the appearance and freshness of the contents.

[0042] Given the above configuration and operation, the external force applied to the lid 18 when the lid-side fitting portion 22 and the body-side fitting portion 12 are fitted together only needs to be weaker than the external force required to crush the container body 2 in the depth direction. In other words, in the packaging container 1, at least in the lid 18, the length of the under portion 24 accounts for at least 50 to 99 percent of the circumference of the lid-side fitting portion 22 of the circumference of the lid 18 (see Figure 6), and in the container body 2, a notch 13 is formed in the body-side fitting portion 12 (see Figure 2). Therefore, even with a relatively weak external force, the lid-side fitting portion 22 and the body-side fitting portion 12 are easily deformed and can be fitted together easily. Furthermore, the packaging container 1 is sufficiently thin, and in the container body 2, the flange tip portion 16 is gently inclined relative to the flange portion 15 and extends outward (see Figure 4), and the notch portion 13 is at least 20 to 50 percent of the circumference of the opening 11 (see Figure 2), which makes it remarkably easy to fit the lid-side fitting portion 22 and the body-side fitting portion 12 together.

[0043] As described above, in this embodiment, the lid-side fitting portion 22 and the main body-side fitting portion 12 fit together easily, while the fit is also firm. That is, the inner dimensions S of the lid-side fitting portion 22 I However, the outer dimensions S of the main body side fitting part 12 O It is formed to be smaller than, with an inner dimension of S I Outer dimensions S O Since the diameter difference is 0.25 millimeters or more, when the flange tip 16 is housed in the socket 23, the main body fitting portion 12 bends inward and contracts to match the size of the socket 23, resulting in a firm fit (see Figure 7). Furthermore, the main body fitting portion 12 attempts to return to its original state due to restoring force inside the socket 23, resulting in a firm fit between the lid fitting portion 22 and the main body fitting portion 12.

[0044] The lid-side fitting portion 22 and the body-side fitting portion 12 are firmly fitted together, while the lid 18 can be easily removed from the container body 2. That is, because the notch portion 13 of the container body 2 is separated from the lid-side fitting portion 22 (see Figure 7), when a user removes the lid 18 from the container body 2, the user's fingers catch on the notch portion 13 between the body-side fitting portion 12 and the lid-side fitting portion 22. Therefore, the user can easily remove the lid 18 from the container body 2.

[0045] The used packaging container 1 is to be discarded, but the user can compress the packaging container 1 as appropriate when disposing of it. Here, the procedure for compressing the packaging container 1 will be explained along with the operation and effects of this embodiment.

[0046] First, the lid 18 is attached to the container body 2. Specifically, the lid-side fitting portion 22 and the body-side fitting portion 12 are fitted together. In this state, an external force is applied to the lid 18 from above toward the bottom portion 3, causing the container body 2 to be crushed. Specifically, as the container body 2, subjected to an external force from above through the lid 18 at the opening 11, is crushed between the container body and the mounting surface, the stress on the side portion 5 is distributed near the opening 11, which has a large radius of curvature, but concentrated at the converging column portion 10, which has a small radius of curvature. The side portion 5 buckles evenly at the three converging column portions 10 where the stress is concentrated, and gradually buckles from the converging column portions 10 toward the opening 11, where the stress is distributed, in the order of the lower portion 9, the second middle portion 8, the first middle portion 7, and the upper portion 6. Therefore, the container body 2 is easily crushed. Furthermore, because the area of ​​the bottom portion 3 is in a predetermined ratio to the area of ​​the opening 11, even if the external force is relatively weak, the pressure applied to the container body 2 increases, and the container body 2 collapses easily. During the process of the container body 2 collapsing, the air inside the packaging container 1 is exhausted from the notch portion 13, so the internal pressure of the container body 2 decreases, and the container body 2 collapses even more easily.

[0047] The multiple diamond-cut irregularities on the side surface 5 of the container body 2 (see Figure 1) promote plastic deformation, so the container body 2 maintains its crushed state and is difficult to return to its original container state. Furthermore, since each of the stepped sections 6, 7, 8, and 9 on the side surface 5 has a predetermined depth and number of steps, the effect of maintaining the crushed state is significant.

[0048] When the container body 2 is crushed and flattened, and an external force is applied to the bottom portion 3 from below by a user, pushing the bottom portion 3 towards the lid 18, the lower portion 9 folds inward and the bottom portion 3 collapses inward. Therefore, the container body 2 is difficult to return to its original container state. The thickness of the crushed and compressed packaging container 1 becomes about 1 / 3 or less of the height of the packaging container 1 before crushing, so the compressed packaging container 1 does not take up much space as waste.

[0049] Another embodiment of the present invention is the packaging container 1 according to the above embodiment inverted, with the container body 2 forming the lid and the lid 18 forming the container body. In this embodiment, the lid is a so-called internal fitting type. Other embodiments do not have a flange tip. In other embodiments, the fitting portion on the main body side fits with the fitting portion on the lid side when it is not bent. In other embodiments, no irregularities are formed on the side surface. In other embodiments, the lid is a film-like so-called top seal material. Other embodiments do not have a lid. In this embodiment, no lid is attached, and external force is applied directly to the container body only, causing it to be crushed. In other embodiments, the shape of the bottom surface of the container body is not limited to an equilateral triangle, but also includes right triangles, isosceles triangles, etc., as long as it has three corners. In this embodiment as well, the corners are rounded to a degree that the radius of curvature can be conceived. In other embodiments, the corners of the bottom surface of the container body are pointed. In other embodiments, the opening of the container body is not limited to a circle, but also includes elliptical, oblong, polygonal, star-shaped, etc., as long as it includes a curve with a radius of curvature greater than that of the corners of the bottom surface. In other words, the opening does not include a radius of curvature of 20 millimeters or less. In other embodiments, the number, shape, and spacing of the notches in the container body are arbitrary. In other embodiments, the number of steps in the side section is arbitrary. That is, there are embodiments in which there are no intermediate steps and the side section consists of two steps, and embodiments in which there are multiple intermediate steps such as a third intermediate step and a fourth intermediate step, and the side section consists of four or more steps. In other embodiments, the depth of each step in the side surface is different. In other embodiments, the depth of each step is the same. In other embodiments, the depth of each step gradually increases from the upper step to the lower step. In other embodiments, the depth of each step gradually decreases from the upper step to the lower step. In other embodiments, the radius of curvature of the cross-section of the horizontal side surface gradually increases from the upper section to the lower section. In other embodiments, the radius of curvature of the cross-section of the horizontal side surface gradually decreases from the upper section to the lower section. In another embodiment, the lid-side fitting portion and the body-side fitting portion are fitted together with an external force equivalent to the external force used to crush the container body in the depth direction. In other embodiments, the length of the notch is less than or equal to half the circumference of the opening. In other embodiments, there is no notch. In other embodiments, the length of the under portion is less than or equal to half the circumference of the lid-side fitting portion.

[0050] Although embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments. Furthermore, various design modifications can be made to the present invention without departing from the matters described in the claims. [Explanation of symbols]

[0051] 1 Packaging container 2. Container body 3 Bottom part 4 corners 5 Side part 6 Upper section 7 First middle section 8 Second middle section 9 Lower section 10 Focusing column 11 Opening 12 Main body side fitting part 13 Notch 14 Flange base 15 Flange section 16 Flange tip 17. Flange tip 18 Lid 19 Top panel 20 Flat area 21 Ridge 22 Lid-side fitting portion 23 Nostalgia 24 under 25 Recessed area R B radius of curvature of the corner R T Radius of curvature of the opening S I Interior dimensions S O External dimensions θ F angle

Claims

1. A container body having a bottom portion, side portions rising from the periphery of the bottom portion, and an opening formed at the upper end of the side portions, In a plan view, the base portion is triangular, and the opening is formed by a curve with a larger radius of curvature than the corners of the triangle in the base portion. The aforementioned side portion has multiple stepped portions in the depth direction that buckle due to external forces when the container body is crushed in the depth direction. A packaging container characterized by the following features.

2. The ratio of the area of ​​the bottom surface to the area of ​​the opening is 1:2 to 1:

10. A packaging container as described in claim 1.

3. Multiple irregularities are formed on the aforementioned side surface. A packaging container as described in claim 1 or 2.

4. The opening has a removable cover, The lid and the opening are fitted together with an external force weaker than the external force that crushes the container body in the depth direction. A packaging container according to any one of claims 1 to 3.

5. The procedure of covering the opening with the lid, The procedure involves pressing the lid toward the bottom surface to crush the container body, The procedure includes pushing up the bottom portion toward the lid while the container body is being crushed, A method for compressing a packaging container as described in feature 4.

Images