Packaging containers

Abstract

To provide a packaging container in which a lid can be fitted to a container body without crushing the container body.SOLUTION: In a packaging container 1, an inner dimension of a lid 18 is smaller than an outer dimension of a container body 2, and a difference in a diameter between the inner dimension and the outer dimension is 0.25 mm or more. An under is formed in a lid side fitting part 22 of the lid 18, a length of the under occupies 50% or more of a circumferential length of the lid side fitting part 22. A notch 13 recessed inward is formed in a body side fitting part 12 of the container body 2, the total length of the three notches 13 accounts for 20 to 50 percent of a circumference of an opening 11 of the circumference at the opening 11.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This invention relates to 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] Both the invention described in prior art document 1 and the invention described in prior art document 2 involve a container body to which a lid is attached to cover the contents, and the lid is designed to be crushed after use to reduce its volume. [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, while the inventions in prior art documents 1 and 2 are structures that assume the container body will be crushed, they also have a structure in which the lid is fitted onto the container body. Therefore, there is a concern that the container body may be unintentionally crushed when fitting the lid. In other words, while both inventions have a structure in which the container body is relatively easy to crush, the lid is fitted onto the container body in the same direction as the external force applied when the container body is crushed. As a result, the container body may be crushed even when trying to fit the lid onto the container body without the intention of crushing it.

[0006] This invention was proposed in view of the above circumstances. Specifically, it aims to provide a packaging container that allows a lid to be fitted onto the container body without crushing the container body. [Means for solving the problem]

[0007] To achieve the above objective, the packaging container according to the present invention comprises a container body having an opening and a lid that is attached to and detached from the opening, wherein the inner dimensions of the lid-side fitting portion that fits into the opening are smaller than the outer dimensions of the body-side fitting portion that fits with the lid-side fitting portion, the difference in diameter between the inner dimensions and the outer dimensions is 0.25 millimeters or more, the length of the fitting projection of the lid-side fitting portion accounts for 50 percent or more of the circumference of the lid, and the body-side fitting portion has a notch formed in the direction away from the lid-side fitting portion.

[0008] The packaging container according to the present invention is characterized in that the main body side fitting portion has a flange portion extending outward at the opening and a flange tip portion extending outward and diagonally downward from the tip of the flange portion, and the angle of the flange tip portion with respect to the flange portion is 45 degrees or less.

[0009] The packaging container according to the present invention is characterized in that the main body side fitting portion fits with the lid side fitting portion in a state where it is bent inward.

[0010] The packaging container according to the present invention is characterized in that a plurality of indentations and protrusions are formed on the side surface of the container body.

[0011] The packaging container according to the present invention is characterized in that, in a plan view, the bottom surface of the container body is triangular, and the opening is formed by a curve with a larger radius of curvature than the corners of the triangle on the bottom surface.

[0012] 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.

[0013] The packaging container according to the present invention is characterized in that the lid-side fitting portion and the body-side fitting portion are fitted together with an external force weaker than the external force required to crush the container body in the depth direction. In other words, the method for compressing a packaging container according to the present invention is characterized in that the lid-side fitting portion is fitted to the body-side fitting portion with an external force weaker than the external force required to crush the container body in the depth direction. [Effects of the Invention]

[0014] The packaging container according to the present invention has a container body having an opening and a lid that is detachably attached to the opening. Among the lids, the inner dimension of the lid-side fitting portion that fits into the opening is smaller than the outer dimension of the main body-side fitting portion that fits with the lid-side fitting portion in the opening, and the diameter difference between the inner dimension and the outer dimension is 0.25 millimeters or more. The length of the fitting convex portion of the lid-side fitting portion occupies 50 percent or more of the circumferential length of the lid, and a notch portion that is recessed in a direction away from the lid-side fitting portion is formed in the main body-side fitting portion. That is, since the inner dimension of the lid-side fitting portion is smaller than the outer dimension of the main body-side fitting portion, when the two are fitted, the container body contracts according to the size of the lid and fits firmly. Further, since the diameter difference between the two is 0.25 millimeters or more, the degree of fitting becomes prominent. When firmly fitting the two, generally, a strong external force is required. However, in the present invention, since the lid-side fitting portion occupies more than 1 / 2 of the circumferential length of the lid, the lid-side fitting portion is easily deformed and easily fits with the main body-side fitting portion. Further, in the present invention, a gap is formed between the main body-side fitting portion and the lid-side fitting portion due to the notch portion being formed in the main body-side fitting portion, and in this gap, the two do not fit. That is, since the region where the main body-side fitting portion and the lid-side fitting portion do not fit exists, the fitting region becomes narrower, so the two easily fit. As described above, the present invention can firmly fit the two, and since the main body-side fitting portion and the lid-side fitting portion have a structure that easily fits, the lid can be fitted to the container body without crushing the container body. Further, since the notch portion is away from the lid-side fitting portion, when the lid is removed from the container body, the user's finger gets caught in the notch portion between the main body-side fitting portion and the lid-side fitting portion. Therefore, the user can easily remove the lid from the container body.

[0015] The packaging container according to the present invention has a main body side fitting portion having a flange portion extending outward at the opening and a flange tip portion extending outward and obliquely downward from the tip of the flange portion, and the angle of the flange tip portion with respect to the flange portion is 45 degrees or less. That is, since the flange tip portion extends gently inclined with respect to the flange portion, the flange tip portion is more likely to bend compared to the case where it is horizontal. Therefore, in the present invention, the main body side fitting portion and the lid side fitting portion can be easily fitted, and the lid can be fitted to the container body without crushing the container body.

[0016] The packaging container according to the present invention has a main body side fitting portion that fits with the lid side fitting portion in a bent state directed inward. That is, when the main body side fitting portion and the lid side fitting portion are fitted, the main body side fitting portion is pushed by the lid side fitting portion and bends, so that the two can be easily fitted. When the two are fitted, the main body side fitting portion is pushed by the lid side fitting portion from above, and bends not only inward but also downward. At the moment when the two are fitted, the main body side fitting portion that has bent downward is bounced and fitted to the lid side fitting portion. Therefore, the impact when the bounced main body side fitting portion collides with the lid side fitting portion is transmitted to the user's hand. Therefore, the user can intuitively perceive the fitting of the two. Further, when the main body side fitting portion and the lid side fitting portion are fitted, the main body side fitting portion is in a state of being bent inward and contracted and fits with the lid side fitting portion. The main body side fitting portion tries to return to its original state by the restoring force in the state of being fitted with the lid side fitting portion, so the two are firmly fitted.

[0017] The packaging container according to the present invention has a plurality of concavo-convex portions formed on the side surface portion of the container body. 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 discarded and crushed, the plastic deformation is promoted by the concavo-convex portions, so that the container body maintains the crushed state and is difficult to return to the original state of the vessel.

[0018] In a plan view, the packaging container has a triangular bottom surface, and the opening is formed by a curve with a larger radius of curvature than the corners of the triangle at the bottom surface. For example, if the opening formed by a predetermined curve is circular, the side surface will change three-dimensionally from a circle to a triangle from the opening to the bottom surface. Therefore, the shape of the side surface in a plan view will gradually converge from the vicinity of the opening, where the radius of curvature is large, to the three corners at the bottom surface, where the radius of curvature is small. When an external force is applied to the opening from above, the container body is crushed between it and the mounting surface. The stress on the side surface is distributed near the opening, where the radius of curvature is large, but concentrated in the areas with small radii of curvature. Consequently, the side surface gradually buckles from the bottom surface side, where the stress is concentrated, toward the opening side, and the container body collapses and becomes flattened. For the reasons described above, the container body collapses easily. Furthermore, if both the opening and the base were rectangular, the four corners would form columns from the opening to the base, making the container less likely to collapse.

[0019] The packaging container according to the present invention has a ratio of 1:2 to 1:10 between the area of ​​the bottom and the area of ​​the opening. In other words, if the area of ​​the bottom is in a predetermined ratio to the area of ​​the opening, the pressure applied to the container body becomes stronger even when the external force is relatively weak, causing the container body to collapse easily.

[0020] In the packaging container according to the present invention, the lid-side fitting portion and the body-side fitting portion are fitted together with an external force weaker than the external force that crushes the container body in the depth direction. Therefore, when a user puts the lid on the container body, the container body is not unintentionally crushed. [Brief explanation of the drawing]

[0021] [Figure 1] Figure 1 is an exploded perspective view showing a disassembled packaging container according to an embodiment of the present invention. [Figure 2] Figure 2 is a plan view showing the container body of a packaging container according to an embodiment of the present invention. [Figure 3]Figure 3 is a side view showing the container body of a packaging container according to an embodiment of the present invention. [Figure 4] Figure 4 is a longitudinal cross-sectional view taken along line IV-IV in Figure 2, showing a longitudinal section of the container body of a packaging container according to an embodiment of the present invention. [Figure 5] Figure 5 is a plan view showing the lid of a packaging container according to an embodiment of the present invention. [Figure 6] Figure 6 is a longitudinal cross-sectional view of the lid of a packaging container according to an embodiment of the present invention, taken from the line VI-VI in Figure 5. [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]

[0022] 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.

[0023] 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.

[0024] 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 forming, vacuum pressure 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.

[0025] Here, the container body 2 will be described in detail based on the drawings. FIGS. 2 to 4 show the appearance, cross-section, and an enlarged part of the container body 2.

[0026] As shown in FIGS. 2 to 4, in plan view (see FIG. 2), the bottom part 3 is substantially an equilateral triangle. Here, the corner parts 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 parts 4 are not sharp. Specifically, the radius of curvature R B of the corner part 4 B is R B ≦ 20 millimeters. Preferably, the radius of curvature R B of the corner part 4 is R B ≦ 15 millimeters, R

[0027] ≦ 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 part 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 .

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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 a reference example of the present invention, the lid is a film-like so-called top seal material. A reference example of the present invention does not have a lid. In this reference example, no lid is attached, and only the container body is subjected to direct external force and 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. The reference example of the present invention does not have a notch. In a reference example of the present invention, the length of the under section is 1 / 2 or less of the circumference of the lid-side fitting section.

[0054] 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]

[0055] 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. It comprises a container body having an opening, and a lid that can be attached to or removed from the opening, The lid-side fitting portion that fits into the opening is an external fitting type that covers the outside of the main body-side fitting portion that fits into the lid-side fitting portion. The inner dimensions of the lid-side fitting portion are smaller than the outer dimensions of the main body-side fitting portion, and the difference in diameter between the inner dimensions and the outer dimensions is 0.25 millimeters or more. The length of the fitting projection of the lid-side fitting portion accounts for 50 percent or more of the circumference of the lid. The main body side fitting portion has a notch formed in the direction away from the lid side fitting portion, allowing for ventilation when the lid side fitting portion and the main body side fitting portion are fitted together. A packaging container characterized by the following features.

2. The main body side fitting portion has a flange portion extending outward in the opening and a flange tip portion extending outward and diagonally downward from the tip of the flange portion. The angle of the flange tip with respect to the flange portion is 45 degrees or less. A packaging container as described in claim 1.

3. The main body side fitting portion engages with the lid side fitting portion in a state where it is bent inward. A packaging container as described in claim 1 or 2.

4. Multiple indentations are formed on the side surface of the container body. A packaging container according to any one of claims 1 to 3.

5. In a plan view, the bottom surface of the container body 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. A packaging container according to any one of claims 1 to 4.

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

10. A packaging container according to the feature described in 5.

7. The lid-side fitting portion and the body-side fitting portion 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 6.

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