JP6962699B2 - Packaging container - Google Patents

Description

The present invention relates to a packaging container, and more particularly to a packaging container made of foamed synthetic resin, in which a product is housed and a wrap film is hung.

Conventionally, when foods and ingredients such as prepared foods, meat, and fish are sold in stores, the foods and ingredients are stored in a synthetic resin packaging container and wrapped with plastic wrap, and then the products are displayed in this state. It is being displayed on the shelves. Since there is a risk of cracks and breakage in the packaging container in the wrapping work process, a packaging container for reducing the risk of cracks and breakage in the wrapping work process has also been proposed.

For example, Patent Document 1 has a side wall rising from a bottom plate and a flange portion formed at the upper end of the side wall, and at the upper end of the opening, rigidity as a container is ensured. There is a disclosure of a packaging container in which a thin portion thinner than the other portion of the side wall is formed at the boundary portion of the side wall. In this wrapping container, in the wrapping work process, the force applied to the side wall when the worker holds the side wall between his fingers in order to store meat or the like in the wrapping container and then move it to the wrapping machine. It is said that the force applied to the flange portion when the wrap film is hung is absorbed by the elastic deformation of the thin-walled portion, and cracks and cracks in the flange portion can be prevented.

Pillow packaging is also known as a known technique for wrap packaging. In pillow packaging, the wrap film pulled out from the roll is made into a cylinder to wrap the contents flowing on the line at regular intervals, and the tubular wrap film is center-sealed in parallel with the line. The contents are packaged by performing end sealing and cutting in the directions orthogonal to each other (see Patent Document 2). When packaging a synthetic resin packaging container containing food or ingredients by this pillow packaging, a heat-shrinkable film is generally used as a wrap film, and the packaging container containing food or ingredients is pillowed. After wrapping the heat-shrinkable film in a shape, a step of heating to bring the heat-shrinkable film into close contact with the packaging container is performed.

Japanese Patent No. 4281081 Japanese Unexamined Patent Publication No. 2010-58829

By the way, when wrapping a synthetic resin wrapping container containing a large amount of foods and ingredients such as products displayed on a product display shelf in a large supermarket, pillow wrapping using the above-mentioned heat-shrinkable film is performed. Often. However, in the case of pillow packaging in which the heat-shrinkable film is brought into close contact, as shown in FIG. 5, when the heat-shrinkable film 13 is brought into close contact with the packaging container 10 by heating, the flange portion 12 extending outward from the upper end of the side wall 11 In addition, since a large load is applied to push the flange portion 12 inward by pressing the contracted heat-shrinkable film 13 indicated by the two-point chain wire, there is a high possibility that the side wall 11 and the flange portion 12 are cracked or damaged. In particular, when the structure is such that a thin portion is formed on a part of the side wall as in Patent Document 1, the risk of cracking or breakage becomes higher. Therefore, there is a demand for a packaging container having a low risk of cracks or breakage in the side walls and flanges even when pillow packaging is performed in which the heat-shrinkable film is adhered.

The present invention has been proposed in view of the above problems, and cracks occur in the side wall and the flange portion when a large load is applied to push the flange portion inward, such as in the case of pillow packaging in which the heat-shrinkable film is shrunk to be brought into close contact with the film. It is an object of the present invention to provide a packaging container having a significantly low risk of damage or damage.

The packaging container of the present invention is made of a foamed synthetic resin having a bottom plate, a side wall rising from the periphery of the bottom plate, and a flange portion extending outward from the upper end of the side wall, and having a closed cell ratio of 80 to 99%. In the formed packaging container made of foamed synthetic resin, the overall shape of the flange portion is formed substantially flat, and the base portion having a flat overall shape is formed on the flange portion, and the maximum height of the flange portion is increased. It is the upper surface of the flat base portion, the wall thickness of the base portion is 2.0 mm to 6.0 mm, the outward protrusion width of the flange portion is 8.0 mm or more, and the upper end portion of the side wall is formed. A step portion that is bent and projects outward is provided, and the flange portion extends outward from the outer end on the inner surface side of the step portion .

According to this, the outward protrusion width of the substantially flat flange portion can be set to 8.0 mm or more, and this protrusion width can be used as the thickness for the load pushing the flange portion inward to increase the compressive strength. .. Further, by using the foamed synthetic resin packaging container, it is possible to absorb the load of pushing the flange portion inward due to the elasticity of the foamed synthetic resin. Therefore, it can be a packaging container with excellent load resistance and strength, and when a large load that pushes the flange portion inward is applied, such as when pillow packaging is performed in which the heat-shrinkable film is shrunk to adhere to the side wall. It is possible to significantly reduce the risk of cracks and breakage in the side wall and the flange portion, and prevent the occurrence of cracks and breakage in the side wall and the flange portion. Further, the wall thickness of the base of the flat flange portion is set to 2.0 mm to 6.0 mm to obtain the functions required as the flange portion such as ease of gripping, and the boundary portion between the side wall and the flange portion and the flange portion. Rigidity can be increased. Therefore, it is possible to make a packaging container that is superior in load resistance and strength, and when a large load that pushes the flange portion inward is applied, such as when pillow packaging is performed in which the heat-shrinkable film is shrunk to adhere to the side wall. The risk of cracks and breakage in the side wall and the flange portion can be further reduced, and the occurrence of cracks and breakage in the side wall and the flange portion can be prevented more reliably. Further, the step portion that protrudes outward can increase the substantial protrusion width of the flange portion to the outside, and this substantial protrusion width is used as the thickness for the load that pushes the flange portion inward. , The compression strength can be further increased. Further, the bending of the step portion can absorb the load of pushing the flange portion inward.

The packaging container of the present invention is provided with a stepped portion protruding outward at the upper end portion of the side wall, the flange portion extends outward from the outer end on the inner surface side of the stepped portion, and the flange portion of the flange portion. It is characterized in that the outward protrusion width is 5.0 mm or less.
According to this, the substantially protruding width of the flange portion to the outside can be increased by the stepped portion protruding outward, and the thickness of the flange portion with respect to the load pushing the flange portion inward. It can be used as a flange to further increase the compression strength. Further, the bending of the step portion can absorb the load of pushing the flange portion inward. Further, if the flat flange portion is made too long, the strength of the flange portion tends to decrease, but the outward protrusion width of the flange portion is 5.0 mm due to the substantial increase in the protrusion width of the flange portion due to the step portion. It can be suppressed to the following, and the strength of the flange portion can be prevented from being lowered due to being too long.

In the packaging container of the present invention, the flange portion extends outward from the upper end portion of the side wall that stands up from the periphery of the bottom plate having a substantially rectangular plan view, and the flange portion and the flange portion and the flange portion are at least on two opposite sides of the side wall. It is characterized in that the outwardly projecting portion including the stepped portion is formed so as to bulge outward toward the substantially center of the side wall.
According to this, by increasing the outwardly protruding portion of the flange portion and the stepped portion toward the substantially center of the side wall, the strength and load bearing capacity tend to be weakened at the substantially center of the side wall. It is possible to increase the strength and load bearing capacity of the side wall and the flange portion in the above. Further, the shape of the outer peripheral edge of the flange portion can be made closer to a circular shape in a plan view, and the absorption force against a load pushing the flange portion inward can be increased.

The packaging container of the present invention is characterized in that each side of the side wall rising from the periphery of the bottom plate having a substantially rectangular plan view is formed in a substantially rectangular shape with a bottom view dented inward at substantially the center.
According to this, in addition to the absorption force for the load pushing the flange portion inward due to the elasticity of the foamed synthetic resin, the absorption force for the load pushing the flange portion inward due to the flexibility of the side wall dented inward at substantially the center is obtained. This makes it possible to dramatically increase the load bearing capacity of the packaging container.

In the packaging container of the present invention, the flange portion extends outward from the upper end portion of the side wall that stands up from the periphery of the bottom plate having a substantially rectangular plan view, and the outward protrusion width of the corner portion of the flange portion is large. The flange portion is characterized in that it is larger than the outward protrusion width other than the corner portion.
According to this, by increasing the outward protrusion width of the corner portion of the flange portion, when packaging containers having a substantially rectangular shape in a plan view are arranged vertically and horizontally and displayed on a product display shelf, they are used for packaging each other. It is possible to reduce the gaps created between the corners of the container, and it is possible to improve the appearance of the display in a vertical and horizontal arrangement in the store. Furthermore, when pillow packaging is performed by shrinking the heat-shrinkable film to bring it into close contact, the risk of cracks and breakage even when a load is applied to the corners of the flange in the horizontal and vertical directions is significantly reduced, resulting in cracks and cracks. It is possible to prevent the occurrence of damage.

The packaging container of the present invention is characterized in that a raised portion formed so as to be concave upward on the outer surface side and convex upward on the inner surface side is provided at substantially the center of the bottom plate.
According to this, the load pushing the flange portion inward can be absorbed by the bending of the raised portion, and the load bearing capacity of the packaging container can be dramatically improved. In particular, when combined with a configuration in which each side of the side wall is formed in a substantially square shape with a bottom view dented inward at substantially the center, the load bearing capacity due to its absorption capacity becomes exceptional.

Further, the packaging container of the present invention is a packaging container made of foamed synthetic resin including a bottom plate, a side wall rising from the periphery of the bottom plate, and a flange portion extending outward from the upper end portion of the side wall. Each of the side walls rising from the periphery of the bottom plate having a substantially rectangular shape in a plan view is formed in a substantially square shape in the bottom view, which is recessed inward at a substantially center.
According to this, in addition to the absorption force for the load pushing the flange portion inward due to the elasticity of the foamed synthetic resin, the absorption force for the load pushing the flange portion inward due to the flexibility of the side wall dented inward at substantially the center is obtained. This makes it possible to dramatically increase the load bearing capacity of the packaging container.

Further, the method of using the packaging container of the present invention includes a first step of accommodating the product in the packaging container of the present invention and a second step of wrapping the packaging container containing the product. It is a feature.

Further, in the method of using the packaging container of the present invention, in the second step, the packaging container containing the product is wrapped with a heat-shrinkable film, and the packaging container in the wrapped state is heated. It is characterized in that a third step is performed.

According to the packaging container of the present invention, when a large load is applied to push the flange portion inward, such as when pillow packaging is performed in which the heat-shrinkable film is shrunk to be brought into close contact with the heat-shrinkable film, the side wall and the flange portion are cracked or damaged. The risk of occurrence can be significantly reduced, and the occurrence of cracks and breakage at the side walls and flanges of the packaging container can be prevented.

(A) is a plan view of the packaging container of the embodiment according to the present invention, and (b) is a bottom view thereof. (A) is a front view of the packaging container of the first embodiment (the rear view is the same as the front view), and (b) is the right side view thereof (the left side view is the same as the right side view). (A) is an AA end view of FIG. 1, (b) is a BB end view of FIG. 1, and (c) is a CC enlarged end view of FIG. (A) is a partially enlarged explanatory view of D-D'in FIG. 3, and (b) is an explanatory view of E-E'partially enlarged in FIG. The explanatory view explaining the state which the heated heat shrink film adheres to the packaging container of the conventional example.

[Packaging container of the embodiment]
As shown in FIGS. 1 to 4, the packaging container 1 of the embodiment according to the present invention has a bottom plate 2 having a substantially rectangular shape in a plan view, a side wall 3 rising from the periphery of the bottom plate 2 in a substantially tapered shape, and a side wall. A flange portion 4 formed so as to extend outward from the upper end portion of the third portion 3 is provided, and the flange portion 4 is integrally formed of a foamed synthetic resin.

The packaging container 1 is formed by heating a foamed synthetic resin sheet with a heater or the like and molding the foamed synthetic resin sheet into a desired shape by a mold at a molding portion. Conventionally known methods such as vacuum forming and compression molding can be adopted for molding. Then, the packaging container 1 can be obtained by trimming the shape portion of the packaging container 1 from the molded foamed synthetic resin sheet.

In this case, the basis weight of the foamed synthetic resin sheet may if for example 170~300g / ^{m 2,} it is more suitable that the 190~260g / ^{m 2.} According to this example, since the amount of synthetic resin contained in the packaging container 1 can be relatively increased, the strength can be increased by that amount, and a desired load bearing capacity can be obtained.

Examples of the thermoplastic resin constituting the foamed synthetic resin sheet include polyethylene resin, polypropylene resin, polystyrene resin, polyamide resin, polyester resin, vinyl chloride resin, etc., and these may be used alone or in combination. Further, a composite material of these resins and an inorganic filler may be used. The closed cell ratio of the foamed synthetic resin sheet is not particularly limited, but is preferably 80 to 99%, more preferably 85 to 99%, and even more preferably 90 to 98%, for example. Such a closed cell ratio may be measured and calculated according to ASTM-D2856.

Then, in the present embodiment, the side wall 3 stands up at a rising angle α so as to be inclined from the bottom plate 2 in a substantially tapered shape. The rising angle α of the side wall 3 is preferably 20 to 45 °, more preferably 23 to 35 °. If the rising angle α of the side wall 3 is less than 20 °, it becomes difficult to obtain an absorption force for a load that pushes the flange portion inward, and if it exceeds 45 °, for example, when food is stored, the bottom plate and the flange portion The side wall between them becomes extremely conspicuous and the appearance becomes poor.

A step portion 31 projecting outward is provided at the upper end portion of the side wall 3, and the flange portion 4 is located above the step portion 31 and outward from the outer end on the inner surface side of the step portion 31. It is extended and formed. The flange portion 4 is formed to be substantially flat, and the wall thickness T of the thin-walled tip portion 42 formed by cutting, the inclined portion 43 leading to the tip portion, and the base portion 41 other than the rising portion 44 from the step portion 31. Is formed to be substantially constant. From the viewpoint of increasing the rigidity of the boundary portion between the side wall 3 and the flange portion 4 and the flange portion 4 while obtaining the functions required as the flange portion 4 such as ease of gripping, the wall thickness T of the base portion 41 of the flange portion 4 is 2. It is more preferably 0.0 mm to 6.0 mm, preferably 3.0 mm to 6.0 mm, and further preferably 3.7 mm to 4.8 mm.

Then, from the viewpoint of increasing the compressive strength against the load pushing the flange portion 4 inward, the outward protrusion width W of the flange portion 4 from the upper end portion of the side wall 3, in the present embodiment, the inner surface side of the step portion 31. The outward protrusion width W of the flange portion 4 from the outer end of the flange portion 4 is more preferably 8.0 mm or more, more preferably 10.0 mm or more. Further, from the viewpoint of preventing the strength of the flange portion 4 from being lowered due to the substantially flat flange portion 4 being too long, the protruding width W thereof is more preferably 14.0 mm or less, more preferably 12.0 mm or less. Further, the protruding widths of the base portion 41 and the rising portion 44 other than the tip portion 42 of the flange portion 4 and the inclined portion 43 are preferably 2.0 mm to 8.0 mm, more preferably 3.0 mm to 6.0 mm. Is.

Further, from the viewpoint of reducing the gap generated between the corners of the arranged packaging containers 1 and 1 when arranged vertically and horizontally on the product display shelf in the store, the corner portion 45 of the flange portion 4 protrudes outward. The width W1 is larger than the outward protrusion width W2 other than the corner portion 45 of the flange portion 4. For example, the outward protrusion width W1 of the corner portion 45 of the flange portion 4 is 9.0 mm to 18.0 mm when the outward protrusion width W2 other than the corner portion 4 is 3.0 mm to 6.0 mm. When it is 3.7 mm to 4.8 mm, it is even better to be 10.0 mm to 15.0 mm.

Further, in the side wall 3 corresponding to at least the two opposite sides of the side wall 3, and in the present embodiment, the two opposite long sides of the packaging container 1 having a substantially rectangular plan view, the flange portion 4 and the step portion 31 are combined with each other. The portion protruding toward the side is formed so as to bulge outward toward the substantially center in the plan view of the side wall 3. In the combination of both the side wall 3 corresponding to the two opposing long sides of the packaging container 1 and the side wall 3 corresponding to the two facing short sides, the flange portion 4 and the step portion 31 are combined outward. The protruding portion may be formed so as to bulge outward toward the substantially center in the plan view of the side wall 3. Due to the outward protrusion width W of the flange portion 4 and the outward protrusion width w'of the step portion 31 on the inner surface side of the container, the flange portion 4 is substantially from the upper end portion of the virtual side wall when there is no step portion 31. The outward protrusion width is the outward protrusion width W of the flange portion 4 + the outward protrusion width w'of the step portion 31. Here, the outward protrusion width w'of the step portion 31 is preferably 2.5 mm to 5.0 mm, and more preferably 3.0 mm to 4.5 mm.

Further, in the packaging container 1, each side of the side wall 3 that rises from the periphery of the bottom plate 2 having a substantially rectangular shape in a plan view has a recess 32 that is gently V-shaped and dents inward at a substantially center, and is abbreviated in a bottom view. Is formed in. The recess 32 recessed inward on the outer surface of the side wall 3 is formed so as to project inward on the inner surface of the side wall 3, and in the present embodiment, each of the opposite long side and the opposite short side of the side wall 3 is 4 The recesses 32 are provided.

Further, a corner cutting portion 331 is formed at the upper end portion of the corner portion 33 of the side wall 3, and the corner cutting portion 331 enhances the strength against the force applied to the corner portion 33.

At the substantially center of the bottom plate 2, a raised portion 21 formed so as to be concave upward on the outer surface side and convex upward on the inner surface side is provided, and the raised portion 21 is a bottom plate 2 having a substantially rectangular shape in a plan view. It is formed into a substantially rectangular shape in a plan view according to the shape of. Although the plan view shape of the raised portion 21 is appropriate, it is formed in a shape substantially corresponding to the plan view shape of the bottom plate 2 from the viewpoint of further improving the absorption force against the load of pressing the flange portion 4 inward. It is preferable to do so. The width and length of the bottom plate 2 are not particularly limited, but are preferably 60 mm or more. According to such a configuration, even when it is transported by the transport device of the wrap wrapping machine or the pillow wrapping machine, it can be stably transported without any particular problem.

For example, foods and ingredients such as prepared foods, meat, and fish are stored in the packaging container 1 of the present embodiment, the heat-shrinkable film 5 which is a wrap film is heated and shrunk, and the heat-shrinkable film 5 is placed in the packaging container 1. When performing pillow packaging for close contact, the flange portion 4 is pushed inward on the flange portion 4 by pressing the heat-shrinkable film 5 that shrinks by heating and adheres (see the thick two-point chain line in FIG. 4). It takes a load. Then, in the packaging container 1 of the present embodiment, the occurrence of cracks and breakage in the side wall 3 and the flange portion 4 due to this load is prevented. Further, the same effect can be obtained when wrapping using a film having no heat shrinkage.

That is, according to the packaging container 1 of the present embodiment, a load that pushes the flange portion 4 inward by setting the outward protrusion width W of the substantially flat flange portion 4 to 8.0 mm or more. It can be used as a thickness to increase the compression strength. Further, the wall thickness T of the base portion 41 of the substantially flat flange portion 4 is set to 2.0 mm to 6.0 mm, and the side wall 3 and the flange portion 4 are obtained while obtaining the functions required as the flange portion 4 such as ease of gripping. The rigidity of the boundary portion and the flange portion 4 of the above can be increased. Further, by using the foamed synthetic resin packaging container 1, it is possible to absorb the load of pushing the flange portion 4 inward due to the elasticity of the foamed synthetic resin. Therefore, it is possible to obtain a packaging container 1 having extremely excellent load resistance and strength, and a large load is applied to push the flange portion 4 inward, such as when performing pillow packaging in which the heat-shrinkable film 5 is shrunk to be brought into close contact with each other. In this case, the risk of cracks or breakage in the side wall 3 or the flange portion 4 can be significantly reduced, and the occurrence of cracks or breakage can be reliably prevented.

Further, the stepped portion 31 protruding outward can increase the substantially protruding width of the flange portion 4 outward as W + w', and this substantial protruding width W + w'is increased inside the flange portion 4. It can be used as a thickness for a load that pushes toward the side, and the compression strength can be further increased. Further, by bending from the step portion 31 to provide the flange portion 4, the load of pushing the flange portion 4 inward can be absorbed. Further, if the flat flange portion is made too long, the strength of the flange portion tends to decrease, but by increasing the substantial protrusion width of the flange portion 4 by the step portion 31 as W + w', the outside of the flange portion 4 The protruding width W can be suppressed to 14.0 mm or less, and the strength of the flange portion can be prevented from being lowered due to being too long.

Further, the outward protruding portion of the flange portion 4 and the stepped portion 3, in other words, the substantially outward protruding width W + w'of the flange portion 4 is increased toward the substantially center of the side wall 3. Therefore, the strength and load bearing capacity of the side wall 3 and the flange portion 4 at substantially the center of the side wall 3 tending to be weakened can be increased. Further, the shape of the outer peripheral edge of the flange portion 4 can be made closer to a circular shape in a plan view, and the absorption force against a load pushing the flange portion 4 inward can be increased.

Further, by forming each side of the side wall 3 in a substantially square shape with a bottom view dented inward at the substantially center, in addition to the absorption force against the load pushing the flange portion 4 inward due to the elasticity of the foamed synthetic resin, at the substantially center. It is possible to obtain an absorption force against a load that pushes the flange portion 4 inward due to the flexibility of the side wall 3 that is dented inward, and the load resistance of the packaging container 1 can be dramatically improved. Further, the load of pushing the flange portion 4 inward can be absorbed by the bending of the raised portion 21, and the load bearing capacity of the packaging container can be dramatically improved. In particular, by forming recesses 32 on each side of the side wall 3 and combining it with a structure in which the bottom surface is substantially indented in the center, the load bearing capacity due to its absorption capacity becomes exceptional.

Further, by increasing the outward protrusion width W1 of the corner portion 45 of the flange portion 4, when the packaging containers 1 having a substantially rectangular plan view are arranged vertically and horizontally and displayed on the product display shelf, they are mutually arranged. It is possible to reduce the gap generated between the corners 45 and 45 of the packaging containers 1 and 1, and it is possible to improve the appearance of the state displayed in the vertical and horizontal arrangement in the store. Furthermore, when pillow packaging is performed in which the heat-shrinkable film 5 is shrunk and brought into close contact with each other, the risk of cracking or breakage is significantly reduced even if a load is applied to the corners 45 of the flange portion 4 in the horizontal and vertical directions. , It is possible to prevent the occurrence of cracks and breakage.

[Modifications of the embodiment, etc.]
The invention disclosed in the present specification is specified by changing these partial configurations to other configurations disclosed in the present specification to the extent applicable, in addition to the inventions and embodiments, or these configurations. Includes those specified by adding other configurations disclosed in the present specification, or those that are specified by deleting these partial configurations to the extent that partial effects can be obtained. The following modifications are also included.

For example, in the above embodiment, the packaging container 1 has a substantially rectangular plan view, but the plan view shape of the packaging container of the present invention is appropriate within an applicable range, for example, within a range to which the features of the present invention can be applied. It is also possible to use a packaging container having a substantially polygonal plane view such as a pentagonal shape, a hexagonal shape, or an octagonal shape, or a packaging container having a substantially circular shape in a plan view. Further, a packaging container in which the stepped portion 31 is not provided, or a packaging in which the flange portion 4 and the stepped portion 31 are combined and the outwardly projecting portion is not formed so as to bulge outward toward the substantially center of the side of the side wall 3. The container or the packaging container in which each side of the side wall 3 is recessed inward at the center and is not formed in a substantially square shape in the bottom view, or the outward protrusion width W1 of the corner 45 of the flange 4 is the flange 4. The present invention also includes a packaging container having an outward protrusion width W2 other than the corner portion 45 of the above, or a packaging container having a bottom plate that does not form a raised portion 21. Further, the packaging container of the present invention can be used in combination with a lid material such as a top seal or a molded lid, in addition to being used for wrapping.

The present invention can be used as a packaging container in which foods and ingredients such as prepared foods, meat, and fish are stored and wrapped in plastic wrap.

1 ... Packaging container 2 ... Bottom plate 21 ... Raised part 3 ... Side wall 31 ... Step part 32 ... Recessed part 33 ... Corner part 331 ... Corner cutting part 4 ... Flange part 41 ... Base 42 ... Tip part 43 ... Inclined part 44 ... Rising part 45 ... Corner 5 ... Heat-shrinkable film α ... Side wall rising angle T ... Flange base wall thickness W ... Flange outward protrusion width W1 ... Flange corner outward protrusion width W2 ... Outer protrusion width other than the corner of the flange w'... Outer protrusion width of the step 10 ... Packaging container 11 ... Side wall 12 ... Flange 13 ... Heat shrink film

Claims (8)

Made of a foamed synthetic resin having a bottom plate, a side wall rising from the periphery of the bottom plate, and a flange portion extending outward from the upper end of the side wall, and formed of a foamed synthetic resin having a closed cell ratio of 80 to 99%. It is a packaging container
The overall shape of the flange portion is formed substantially flat, and a base portion having a flat overall shape is formed on the flange portion.
The maximum height of the flange portion is the upper surface of the flat base portion.
The wall thickness of the base is set to 2.0 mm to 6.0 mm.
The outward protrusion width of the flange portion should be 8.0 mm or more, and the flange portion should have an outward protrusion width of 8.0 mm or more .
A packaging container characterized in that a step portion that is bent and protrudes outward is provided at the upper end portion of the side wall, and the flange portion extends outward from the outer end on the inner surface side of the step portion. The packaging container according to claim 1, wherein the outward protrusion width of the flange portion is 5.0 mm or less. The flange portion extends outward from the upper end portion of the side wall that stands up from the periphery of the bottom plate having a substantially rectangular plan view.
At least on the two opposite sides of the side wall, the outwardly projecting portion of the flange portion and the step portion combined is formed so as to bulge outward toward the substantially center of the side wall. The packaging container according to claim 2. 6. Packaging container. The flange portion extends outward from the upper end portion of the side wall that stands up from the periphery of the bottom plate having a substantially rectangular plan view.
The aspect according to any one of claims 1 to 4, wherein the outward protrusion width of the corner portion of the flange portion is larger than the outward protrusion width of the flange portion other than the corner portion. The described packaging container. According to any one of claims 1 to 5, a raised portion formed so as to be concave upward on the outer surface side and convex upward on the inner surface side is provided at substantially the center of the bottom plate. The described packaging container. The first step of accommodating the product in the packaging container according to any one of claims 1 to 6.
A method of using a packaging container, which comprises a second step of wrapping the packaging container containing the product. In the second step, the packaging container containing the product is wrapped with a heat-shrinkable film and wrapped.
The method for using a packaging container according to claim 7, wherein a third step of heating the packaging container in a wrapped state is performed.

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