JP2023149371A - Packaging container and compression method for packaging container - Google Patents

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

Application for application of Article 30, Paragraph 2 of the Patent Act 1. Exhibited at "Supermarket Trade Show 2022" held from February 16th to 18th, 2020 2. Published on pages 33 to 34 of "CHUO New Collection Chuo Kagaku Co., Ltd. New Product Series Special Issue 2022" published by Chuo Kagaku Co., Ltd. on February 16, 2020. 3. Displayed at our company's permanent exhibition hall from March 14th to June 30th, 2020 4. Published in "Packaging Times" published by Nippo Business Co., Ltd. on March 21, 2020 5. Video distribution on the Internet site (Youtube) on March 18, 2020 (URL "https://www.youtube.com/watch?v=Mgt5cyK7Kc8") 6. Posted on the internet site (Instagram) on March 24, 2020 (URL "https://www.instagram.com/p/CbeJNRiF73h/?utm_medium=copy_link") 7. Published in the "Product Manual" distributed on March 3, 2020

The present invention relates to a packaging container and a method for compressing a packaging container.

2. Description of the Related Art Conventionally, when salads, side dishes, etc. are sold in supermarkets, etc., they are displayed in plastic containers. Generally, when plastic containers are disposed of, it is preferable that they can be crushed so that they do not take up bulk. There is a packaging container described in the following patent document 2 (hereinafter referred to as "publicly known document 2 invention").

In the invention of Publication 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 becomes a trigger for the container body to start collapsing. Similarly, in the invention of Publication Document 2, a recess is formed at the lower part of the side surface of the container, and this recess becomes a trigger for the container to begin to collapse.

Patent No. 5431822 Patent No. 4496468

However, in both the invention of Publication Document 1 and the invention of Publication Document 2, since a recess is formed in the side surface of the container, there is a concern that the user may be given the impression that the appearance is impaired. In addition, since the duty of a container is to contain the things to be stored, a shape that reduces the volume or makes it difficult to take out the things to be stored lacks the essence of the container, and a recess on the side is unnecessary. This reduces the volume of the container, and the stored items become trapped, making it difficult to take out the stored items. In other words, the inventions of the prior art document 1 and the prior art document 2 place too much emphasis on the structure for crushing the container, and there is a concern that they may give the impression to the user that the container lacks beauty and essence.

The present invention has been proposed in view of the above circumstances. That is, the object of the present invention is to provide a packaging container that has an excellent appearance, does not unnecessarily reduce its volume, and can be easily collapsed.

In order to achieve the above object, a packaging container according to the present invention includes a container body having a bottom part, a side part rising from the periphery of the bottom part, and an opening formed at the upper end of the side part. Among these, the bottom part is triangular in plan view, and the opening part is formed by a curved line having a larger radius of curvature than the corners of the triangle in the bottom part.

The packaging container according to the present invention is characterized in that the ratio of the area of the bottom portion to the area of the opening is 1:2 to 1:10.

The packaging container according to the present invention is characterized in that a plurality of projections and depressions are formed on the side surface.

The packaging container according to the present invention has a lid that is attached to and removed from the opening, and the lid and the opening fit together with an external force that is weaker than the external force that is applied when crushing the container body in the depth direction. , is characterized by. In other words, the method for compressing a packaging container according to the present invention includes fitting the lid side fitting part into the main body side fitting part with an external force that is weaker than an external force when crushing the container main body in the depth direction. It is characterized by causing.

The method for compressing a packaging container according to the present invention includes a step of putting the lid on the opening, a step of crushing the container body by pushing the lid toward the bottom surface, and a step of crushing the container body by pressing the lid toward the bottom surface. It is characterized by including the step of pushing up the bottom part toward the lid in the crushed state.

The packaging container according to the present invention has a container body having a bottom part, a side part rising from the periphery of the bottom part, and an opening formed at the upper end of the side part, in which the bottom part is triangular in plan view. The opening is formed by a curved line having a larger radius of curvature than the corners of the triangle at the bottom. For example, if the opening formed by a predetermined curve is circular, the side part will have a shape that changes three-dimensionally from the opening to the bottom part from a circle to a triangle. The shape of the portion gradually converges from the vicinity of the opening where the radius of curvature is large to the three corner portions where the radius of curvature is small at the bottom portion. When an external force is applied to the opening from above, the container body is crushed by being pinched between it and the installation surface, and the stress on the side surface is dispersed near the opening, which has a large radius of curvature. Concentrates in areas with small radius. Therefore, the side surface gradually buckles from the bottom surface where stress is concentrated toward the opening, and the container body collapses into a flat state. As described above, the container body is easily crushed. Further, since the present invention does not have a structure in which a concave-convex structure is provided that functions when the container body is crushed, the container has an excellent appearance and does not have an unnecessary reduction in volume. Note that if both the opening and the bottom are square, the four corners will be columnar from the opening to the bottom, making the container body less likely to collapse.

In the packaging container according to the present invention, the ratio of the area of the bottom part to the area of the opening is 1:2 to 1:10. That is, if the area of the bottom part is a predetermined ratio to the area of the opening part, even if the external force is relatively weak, the pressure applied to the container body will be strong and the container body will easily collapse.

The packaging container according to the present invention has a plurality of projections and depressions formed on the side surface. With this configuration, the side part becomes strong and the container body is hard to be crushed. On the other hand, if the used container body is crushed when being discarded, the unevenness promotes plastic deformation, making it difficult for the container body to return to its original container state.

The packaging container according to the present invention has a lid that is attached to and removed from the opening, and the lid and the opening fit together with an external force that is weaker than the external force that is applied when crushing the container body in the depth direction. Therefore, when the user puts the lid on the container body, the container body will not be crushed inadvertently.

The method for compressing a packaging container according to the present invention includes a step of capping the opening, a step of crushing the container body by pushing the lid toward the bottom, and a step in which the container body is crushed. and pushing the bottom part up toward the lid. Therefore, the thickness of the crushed container body becomes thinner, and the container body remains crushed, making it difficult to return to its original container state.

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

The following is a description of a packaging container according to an embodiment of the invention. Hereinafter, this embodiment will be described based on the drawings. FIG. 1 shows the appearance of a packaging container 1.

As shown in FIG. 1, the packaging container 1 is composed of a container body 2, which is a container in which an object (not shown) is housed, and a lid 18 for covering the object. ing. In addition to prepared foods, the stored items include, for example, fresh products such as fruits, vegetables, fresh fish, and meat. The container body 2 has a bottom part 3, a side part 5 rising from the periphery of the bottom part 3, and an opening 11 formed at the upper end of the side part 5. The opening 11 has a main body side fitting part 12 into which the lid 18 is fitted when it is attached or removed. On the other hand, the lid 18 has a top plate part 19 and a lid side fitting part 22 formed on the periphery of the top plate part 19 and fitting with the main body side fitting part 12. When the lid 18 is attached to the container body 2, the lid side fitting part 22 covers the outside of the main body side fitting part 12, so the packaging container 1 is of a so-called external fitting type.

The container body 2 and the lid 18 are made of plastic, such as polyester resins such as polyethylene terephthalate (PET), olefin resins such as polypropylene (PP), and the like. Both the container body 2 and the lid 18 are formed by a method such as vacuum forming, hot plate pressure forming, vacuum pressure forming, double-sided vacuum forming, or the like. The thickness of the synthetic resin sheet before molding is, for example, 0.19 to 0.6 mm, preferably 0.21 to 0.5 mm, more preferably 0.23 to 0.35 mm. be. Although the container body 2 and the lid 18 are transparent, they may be translucent or colored.

Here, the container body 2 will be explained in detail based on the drawings. 2 to 4 show the external appearance, cross section and enlarged portion of the container body 2. FIG.

As shown in FIGS. 2 to 4, in plan view (see FIG. 2), the bottom portion 3 has a substantially equilateral triangle shape. Here, the corners 4, which are the three vertices of the triangle, are rounded to such an extent that the radius of curvature can be seen in plan view. In other words, the corners 4 are not sharp. Specifically, the radius of curvature R _B of the corner portion 4 is R _B ≦20 mm. Preferably, the radius of curvature R _B of the corner portion 4 is such that R _B ≦15 mm and R _B ≦10 mm.

In plan view (see FIG. 2), the opening 11 has a circular shape including a curved line with a radius of curvature R _T larger than the radius of curvature R _B of the corner 4. That is, R _B < _RT , and specifically, the radius of curvature _RT of the opening 11 is 20< _RT . Preferably, 40< _RT , more preferably 55< _RT .

The main body side fitting portion 12 of the opening 11 is an annular flange. The main body side fitting part 12 is formed with three notches 13 that are recessed toward the inside. The notches 13 are arranged at equal intervals on the circumference. Of the circumference of the opening 11, the total length of the three notches 13 occupies 20 to 50 percent of the circumference of the opening 11. More preferably, it accounts for 22 to 40 percent, and still more preferably 25 to 35 percent.

As shown in FIG. 4, the main body side fitting part 12 includes a flange base 14 connected to the upper end of the side part 5, and a flange connected to the flange base 14 and extending outward of the opening 11. 15, a flange tip 16 connected to the tip of the flange 15 and extending outward of the opening 11, and a flange tip 17 connected to the tip of the flange tip 16. ing. The flange base 14 extends outward and obliquely upward from the upper end of the side surface 5. The flange portion 15 extends in the horizontal direction. The angle of the flange base 14 with respect to the flange portion 15 is about 45 degrees. The flange tip portion 16 extends outward from the flange portion 15 and diagonally downward. The angle θ _F of the flange tip 16 with respect to the flange portion 15 is 10 degrees or more and 45 degrees or less, preferably 15 degrees or more and 40 degrees or less, and more preferably 25 degrees or more and 35 degrees or less.

The opening part 11 is formed larger than the bottom part 3. Therefore, the side surface portion 5 gradually narrows from the opening portion 11 toward the bottom surface portion 3, and has a mortar-like or funnel-like shape. The side surface portion 5 has four stages in the depth direction, including an upper portion 6 connected to the opening 11, a first middle portion 7 connected to the lower part of the upper portion 6, and the first middle portion 7. It has a second middle part 8 connected to the lower part of the second middle part 8, and a lower part 9 connected to the lower part of the second middle part 8. The lower part 9 is connected to the bottom part 3. The volume of the side surface portion 5 gradually decreases from the upper portion 6 to the lower portion 9.

Since the opening 11 is circular and the bottom part 3 is triangular, the side part 5 changes from circular to triangular from the opening 11 to the bottom part 3 and from the upper part 6 to the lower part 9. The shape has changed three-dimensionally. The shape of the side surface portion 5 in a plan view includes three corner portions having a smaller radius of curvature than the opening portion 11 toward the bottom portion 3 from the vicinity of the opening portion 11 having a larger radius of curvature than the corner portion 4 of the bottom portion 3. 4 and is gradually converging. Therefore, the focusing column part 10 is formed from the lower part 9 to the corner part 4, from the second middle part 8 to the corner part 4, or from the first middle part 7 to the corner part 4.

The side surface portion 5 has a plurality of projections and depressions formed by diamond cutting. More specifically, each of the step portions 6, 7, 8, and 9 of the side surface portion 5 is cut to form a plurality of triangular surfaces arranged in the circumferential direction.

The ratio of the area of the bottom part 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, more preferably 1:20 to 1:35. It is. The ratio of the height of the container body 2 to the area of the bottom part 3 is 1:4 to 1:10, preferably 1:5 to 1:9, more preferably 1:6 to 1:8. It is.

The depth (vertical distance) of each step 6, 7, 8, 9 in the side surface 5 is 7 to 25 mm, preferably 8 to 20 mm, more preferably 9.5 to 16 mm. It is 5 mm. The number of steps of each step 6, 7, 8, 9 (number of boundaries of each step 6, 7, 8, 9) is 2 to 5, preferably 2 to 4, more preferably, It is 3 as in this embodiment.

Next, the lid 18 will be explained in detail based on the drawings. 5 and 6 show the exterior, cross-section and enlarged portion of the lid 18.

As shown in FIG. 5 or 6, in plan view (see FIG. 5), the lid 18 is circular, following the opening 11 of the container body 2. The top plate portion 19 of the lid 18 has a disk-shaped flat portion 20 and a raised portion 21 connected to the peripheral edge of the flat portion 20. The raised portion 21 is raised from the flat portion 20 and has an annular shape. The lid-side fitting part 22 has an annular shape, and when viewed from the side (see FIG. 6), includes a pocket 23 as a fitting recess connected to the periphery of the raised part 21, and a lower part of this pocket 23. It has an under 24 as a fitting convex portion. The pocket 23 projects from the raised portion 21 toward the outside of the top plate portion 19, while the under 24 projects from the pocket 23 toward the inside of the top plate portion 19. Of the circumference of the lid 18, the length of the under 24 occupies 50 to 99% of the circumference of the lid side fitting portion 22. More preferably, it accounts for 75 to 90 percent, and still more preferably 93 to 96 percent. Four depressions 25 are formed in the under 24 for mold release (see FIG. 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 recessed portion 25 is the under portion 24 .

The inner dimension S _I (see FIG. 6) of the lid-side fitting portion 22 based on the pocket 23 is the outer dimension S _O (see FIG. 4), and the diameter difference between the inner dimension S _I and the outer dimension S _O is 0.25 mm or more and 2 mm or less. More preferably, it is 1 mm or less, and still more preferably 0.8 mm or less. In other words, the difference between the circumferential length of the lid side fitting part 22 based on the pocket 23 and the circumferential length of the main body side fitting part 12 based on the flange leading edge part 17 is 1.5 mm or more, It is 2.8 mm or less, more preferably 1.9 mm or more and 2.5 mm or less.

The container main body 2 configured as described above and the lid 18 are fitted together to form the packaging container 1. Here, the manner in which the container body 2 and the lid 18 fit together will be explained together with the operation and effects of this embodiment. FIG. 7 shows a partially enlarged cross section of the container body 2 and the lid 18 in a fitted state.

When the lid 18 is attached to the container body 2, the lid side fitting part 22 is placed on the main body side fitting part 12. Specifically, in FIG. 7, the under 24 of the lid side fitting part 22 contacts the flange part 15 or the flange tip part 16 of the main body side fitting part 12. When an external force is applied to the lid 18 from above, the flange tip 16 is pushed downward and bent. The flange tip portion 16 is gently inclined with respect to the flange portion 15 and extends outward, so that it can be bent well. Therefore, even with a relatively weak external force, the lid side fitting part 22 and the main body side fitting part 12 can easily fit together.

The flange tip 16 is pushed by the under 24 and bends downward and inward, so even with a relatively weak external force, the lid side fitting part 22 and the main body side fitting part 12 fit together. It's easy to do. When the flange tip 16 is accommodated in the pocket 23 after climbing over the under 24, it is flipped from a downwardly bent state and collides with the pocket 23 at the moment it gets over the under 24. The impact at that time is transmitted to the hand of the user who is applying the external force. Therefore, the user can intuitively perceive the fitting between the lid side fitting part 22 and the main body side fitting part 12.

Since the length of the under 24 occupies at least 50 to 99% of the circumference of the lid-side fitting part 22 of the circumference of the lid 18, even if a relatively weak external force is applied, the lid-side fitting will not occur. The portion 22 is easily deformed and easily fitted into the main body side fitting portion 12.

Since the main body side fitting part 12 is formed with three notches 13 that are recessed toward the inside (see FIG. 2), the main body side fitting part 12 and the lid side fitting part 22 are fitted together. In the fitted state, the notch portion 13 is separated from the lid-side fitting portion 22. A gap is formed between the main body side fitting part 12 and the lid side fitting part 22 by the notch part 13, and since the two do not fit in this gap, the area where they fit becomes narrower by the gap. . Therefore, even with a relatively weak external force, the lid side fitting part 22 and the main body side fitting part 12 can easily fit together. Furthermore, since the notch 13 occupies at least 20 to 50 percent of the circumference of the opening 11 (see FIG. 2), the lid-side fitting portion 22 is free from deformation. The lid side fitting part 22 and the main body side fitting part 12 can easily fit together.

Moreover, since the main body side fitting part 12 and the lid side fitting part 22 are annular (see FIG. 1), they are easily bent, so even if a relatively weak external force is applied, the lid side fitting part 22 and the main body side fitting part 22 are easily bent. It is easy to fit with the side fitting part 12.

In the first place, the packaging container 1 is made of a synthetic resin sheet with a thickness of at least 0.19 to 0.6 mm that is stretched during the molding process, so it is sufficiently thin. bends well. Therefore, even with a relatively weak external force, the lid side fitting part 22 and the main body side fitting part 12 are easily deformed and fit together easily.

On the other hand, since the side surface 5 of the container body 2 is made sturdy due to the plurality of unevenness created by diamond cutting (see FIG. 1), the container body 2 is not easily crushed even when the lid 18 is attached to the container body 2. . Note that when light such as illumination is introduced into the container body 2 by diamond cutting, the appearance and freshness of the stored items can be enhanced.

Considering the above configuration and operation, the external force applied to the lid 18 when the lid side fitting part 22 and the main body side fitting part 12 are fitted together is the external force required to crush the container main body 2 in the depth direction. Something weaker than that is sufficient. That is, in the packaging container 1, at least in the lid 18, the length of the under 24 occupies at least 50 to 99% of the circumference of the lid side fitting part 22 of the circumference of the lid 18 (as shown in FIG. 6), in the container body 2, the notch 13 is formed in the main body side fitting part 12 (see Fig. 2), so even if a relatively weak external force is applied, the lid side fitting part 22 and the main body The side fitting portion 12 is easily deformable and fits easily. Furthermore, the packaging container 1 is sufficiently thin, and the flange tip 16 of the container body 2 is gently inclined with respect to the flange 15 and extends outward (see FIG. 4). 13 is at least 20 to 50% of the circumference of the opening 11 (see FIG. 2), the ease of fitting between the lid side fitting part 22 and the main body side fitting part 12 is remarkable. be.

As described above, in this embodiment, the lid side fitting part 22 and the main body side fitting part 12 are easily fitted together, and the fitted state is also firm. That is, the inner size S _I of the lid side fitting part 22 is formed smaller than the outer size S _O of the main body side fitting part 12, and the diameter difference between the inner size S _I and the outer size S _O is 0.25. millimeter or more, when the flange tip 16 is accommodated in the pocket 23, the main body side fitting portion 12 bends inward and contracts to match the size of the pocket 23, and is firmly fitted (Fig. (see 7). Furthermore, since the main body side fitting part 12 tries to return to its original state by restoring force inside the pocket 23, the lid side fitting part 22 and the main body side fitting part 12 are firmly fitted.

While the lid side fitting part 22 and the main body side fitting part 12 are firmly fitted, the lid 18 is easily removed from the container main body 2. That is, since the notch part 13 of the container body 2 is separated from the lid side fitting part 22 (see FIG. 7), when the user removes the lid 18 from the container body 2, the user's fingers are It is caught in the notch 13 between the fitting part 12 and the lid-side fitting part 22. Therefore, the user can easily remove the lid 18 from the container body 2.

When the used packaging container 1 is discarded, the user can compress the packaging container 1 as appropriate. Here, the compression procedure of the packaging container 1 will be explained together with the operation and effects of this embodiment.

First, the lid 18 is attached to the container body 2. Specifically, the lid side fitting part 22 and the main body side fitting part 12 are fitted. In this state, an external force is applied to the lid 18 from above toward the bottom portion 3, thereby crushing the container body 2. Specifically, when an external force is applied to the opening 11 from above through the lid 18, the container main body 2 is crushed by being pinched between it and the installation surface, and the stress on the side surface 5 is caused by the curvature Although the light is dispersed near the opening 11 with a large radius, it is concentrated in the focusing column 10 with a small radius of curvature. In the side surface portion 5, the three focusing column portions 10 on which stress is concentrated are evenly buckled, and the three focusing column portions 10 have a lower portion 9, a second middle portion 8, and a first portion toward the opening 11 side where stress is dispersed from the focusing column portion 10. The middle section 7 and the upper section 6 gradually buckle in this order. Therefore, the container body 2 is easily crushed. Furthermore, since the area of the bottom part 3 is a predetermined ratio to the area of the opening part 11, even when the external force is relatively weak, the pressure applied to the container body 2 becomes strong and the container body 2 is easily crushed. . In the process of crushing the container body 2, the air inside the packaging container 1 is exhausted from the notch 13, so the internal pressure of the container body 2 decreases and the container body 2 collapses more easily.

The plurality of diamond-cut irregularities on the side surface 5 of the container body 2 (see Figure 1) promotes plastic deformation, so the container body 2 is maintained in its collapsed state and returned to its original state. It is difficult to return to that state. Furthermore, since each of the step portions 6, 7, 8, and 9 of the side surface portion 5 has a predetermined depth and a predetermined number of steps, the effect that the collapsed state is maintained is remarkable.

When the container body 2 is crushed and flattened, when an external force is applied from below to the bottom part 3 by the user and the bottom part 3 is pushed up toward the lid 18, the lower part 9 is folded back inward. The bottom portion 3 is depressed inward. Therefore, the container body 2 becomes difficult to return to its original container state. The thickness of the crushed and compressed packaging container 1 is approximately 1/3 of the height of the packaging container 1 before being crushed, or less, so the compressed packaging container 1 is not treated as waste. Not bulky.

In another embodiment of the present invention, the packaging container 1 according to the embodiment described above is turned upside down, and the container body 2 serves as a lid, and the lid 18 serves as a container body. The embodiment in this case is a so-called internal fitting type.
Other embodiments do not have a flange tip.
In another embodiment, the main body side fitting part fits into the lid side fitting part in an unflexed state.
In other embodiments, no unevenness is formed on the side surface.
In another embodiment, the lid is a so-called top seal material in the form of a film.
Other embodiments do not have a lid. In this embodiment, the lid is not attached and external force is applied directly to only the container body, causing it to collapse.
In other embodiments, the shape of the bottom portion of the container body is not limited to an equilateral triangle, but may also include a right triangle, an isosceles triangle, etc. as long as it has three corners. Note that in this embodiment as well, the corners are rounded to such an extent that the radius of curvature can be seen.
In other embodiments, the corners of the bottom of the container body are sharp.
In other embodiments, the opening of the container body is not limited to a circular shape, but may also include an ellipse, an oval, a polygon, a star, etc., as long as it includes a curved line with a radius of curvature larger than the corner of the bottom part. In other words, the aperture does not include a radius of curvature less than 20 millimeters.
In other embodiments, the number, shape, and spacing of the cutouts in the container body are arbitrary.
In other embodiments, the number of tiers of the side sections is arbitrary. In other words, there are embodiments in which there is no middle part and the side part is composed of two stages, and embodiments in which the side part is composed of a plurality of middle parts such as a third middle part and a fourth middle part, and the side part is composed of four or more stages. In some embodiments, the
In other embodiments, the depths of the steps in the side sections are different.
In other embodiments, the depth of each step is the same.
In other embodiments, the depth of each step gradually increases from the top to the bottom.
In another embodiment, the depth of each step gradually decreases from the upper step to the lower step.
In another embodiment, the radius of curvature of the horizontal cross section of the side surface gradually increases from the upper stage to the lower stage.
In another embodiment, the radius of curvature of the horizontal cross section of the side surface gradually decreases from the upper stage to the lower stage.
In another embodiment, the lid side fitting part and the main body side fitting part fit together with an external force equivalent to the external force when crushing the container main body in the depth direction.
In other embodiments, the length of the notch is less than or equal to 1/2 of the circumference of the opening.
Other embodiments do not have cutouts.
In another embodiment, the length of the under is 1/2 or less of the circumferential length of the lid side fitting part.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments. The present invention can be modified in various ways without departing from the scope of the claims.

1 Packaging container 2 Container body 3 Bottom part 4 Corner part 5 Side part 6 Upper part 7 First middle part 8 Second middle part 9 Lower part 10 Focusing column part 11 Opening part 12 Main body side fitting part 13 Notch part 14 Flange base 15 Flange 16 Flange tip 17 Flange tip 18 Lid 19 Top plate 20 Flat portion 21 Protrusion 22 Lid side fitting portion 23 Bosom 24 Under 25 Recess R Radius of curvature of _B corner R _T opening Radius of curvature S _I inner dimension S _O outer dimension θ _F angle

Claims (5)

A container body having a bottom part, a side part rising from a periphery of the bottom part, and an opening formed at an upper end of the side part,
In plan view, the bottom part is triangular, and the opening is formed by a curved line having a larger radius of curvature than the corners of the triangle in the bottom part.
A packaging container characterized by: The ratio of the area of the bottom portion to the area of the opening is 1:2 to 1:10.
The packaging container according to claim 1, characterized in that: A plurality of irregularities are formed on the side surface portion.
The packaging container according to claim 1 or 2, characterized in that: having a lid that is attached to and detached from the opening;
The lid and the opening fit together with an external force that is weaker than an external force when crushing the container body in the depth direction.
The packaging container according to any one of claims 1 to 3, characterized in that: a step of putting the lid on the opening;
a step of crushing the container body by pushing the lid toward the bottom portion;
a step of pushing up the bottom portion toward the lid in a state where the container body is crushed;
5. The method for compressing a packaging container according to claim 4.

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