JP2019142551A - Package container - Google Patents

Abstract

To provide a package container which may be deformed between a box state and a flat state and has excellent design properties.SOLUTION: A package container comprises a first part and a second part that overlap each other. Both of the first part and the second part comprise a convex polygonal section of a convex polygonal shape and isosceles trapezoidal sections of an isosceles trapezoidal shape which extends from each side of the convex polygonal section and the side is defined as one of two parallel side. At least either of the isosceles trapezoidal sections of the first part and the second part is an isosceles trapezoidal shape, but not a rectangular shape. In a flat state, a gap is generated between the first part and the second part, and an upper surface, a lower surface, and a plurality of side surfaces are formed, whereby the package container is deformed into a box-shaped state. In the box-shaped state, the gap between the first part and the second part is cancelled and the first part and the second part are brought into overlap, whereby the package container is deformed into the flat state.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a packaging container.

  A packaging container formed by folding a sheet material into a box shape and overlapping and sealing the end portions is known.

  For example, in Patent Document 1, a peelable pull tab is provided on a side seal of a container main body using a paper-based sheet material, and the pull tab is peeled through a peelable layer made of an easily peelable tape-like film. A packaging container (liquid packaging paper container) that can be provided is disclosed. This packaging container can be disassembled by using the trigger to peel off the side seal portion by pulling the pull tab, or by cutting the side plate by pulling the pull tab provided on the side plate.

JP-A-9-290822

  Since the packaging container of Patent Document 1 is easy to disassemble at the time of disposal, it is useful for reducing the volume of trash. However, the packaging container once disassembled cannot be reassembled and used.

  Further, a packaging container formed into a box shape by folding a sheet material as in Patent Document 1 is easy to assemble with a simple structure, but has a low degree of freedom in shape and it is difficult to adopt a shape with high design. It was.

  The present invention has been made in view of such a problem, and can be deformed between a box-shaped state and a flat state, and after being crushed into a flat state once again, it becomes a box-shaped state again. An object of the present invention is to provide a packaging container that can be reused by being returned and has high design properties.

  One aspect of the present invention for solving the above-described problem is a packaging container that is formed of a sheet material and is deformable between a box-shaped state and a flat state, and overlaps each other in the flat state. A first portion and an opening formed in the first portion, the first portion and the second portion from the convex polygonal surface of the convex polygon and each side of the convex polygonal surface, respectively. An isosceles trapezoidal surface that extends and has one side out of two parallel sides, a plurality of folded surfaces provided between each adjacent isosceles trapezoidal surface, and the entire outer edge An isosceles trapezoidal surface having at least one of the first part and the second part is an isosceles trapezoidal shape that is not rectangular, and the first part and the second part. Is a side seal part that is sealed to each other at the periphery, or a connection in which the sheet material is folded back In the flat state, the sheet material is folded at the peripheral portion, or further, the sheet material is extended at the connection portion, and the first portion is connected to the first portion. A gap is formed between the second portion and a top surface that is a convex polygonal surface including the opening of the first portion, a bottom surface that is a convex polygonal surface of the second portion and faces the top surface, and a rectangular shape By forming a plurality of side surfaces including a tapered surface formed by an isosceles trapezoidal surface and a folded piece obtained by folding the folded surface and the peripheral edge, the folded pieces are stacked along the side surface to form a box shape In the box-type state, the folded piece is detached from the side surface, the folded piece is extended, the sheet material is extended at the peripheral edge, or further, the sheet is extended at the extended connection portion. By folding the toe material, the gap between the first part and the second part is eliminated, and the first part and the second part can be overlapped with each other to be transformed into a flat state. It is a packaging container.

  According to the present invention, it can be deformed between a box-type state and a flat state, and can be reused by returning to the box-type state again after being crushed to a flat state once. It is possible to provide a packaging container having high design properties.

The perspective view and side view which show the box-shaped state of the packaging container which concerns on the 1st Embodiment of this invention The perspective view which shows the flat state of the packaging container which concerns on the 1st Embodiment of this invention The top view of the blank of the packaging container which concerns on the 1st Embodiment of this invention The figure which shows the deformation | transformation procedure of the packaging container which concerns on the 1st Embodiment of this invention. The perspective view and side view which show the box-shaped state of the packaging container which concerns on the 2nd Embodiment of this invention The top view of the blank of the packaging container which concerns on the 2nd Embodiment of this invention The perspective view and side view which show the box-shaped state of the packaging container which concerns on the 3rd Embodiment of this invention The top view of the blank of the packaging container which concerns on the 3rd Embodiment of this invention Plan view showing a variation of the blank

  A packaging container according to an embodiment of the present invention will be described with reference to the drawings. In each embodiment and modification, the same or corresponding components are denoted by the same reference numerals, and description thereof will be omitted as appropriate. Moreover, in the following description, for convenience, the up and down directions in a state where the packaging container is erected in a box-like state are referred to as the up and down direction.

<First Embodiment>
The packaging container 100 according to the first embodiment of the present invention has a box-shaped state and a flat state formed by stacking and sealing the end portions of a blank obtained by cutting a sheet material into a predetermined shape. It is a container that can be deformed between.

  FIG. 1 shows a perspective view (FIG. 1 (a)) and a side view (FIG. 1 (b)) of the packaging container 100 in a box shape, and FIG. 2 shows a perspective view of the packaging container 100 in a flat state. The figure is shown. Moreover, the top view of an example of the blank of the packaging container 100 is shown in FIG. 2A is a perspective view showing a state in which the upper surface 110 of the packaging container 100 in a flat state is turned upward, and FIG. 2B is a lower surface 130 of the packaging container 100 in a flat state. It is a perspective view which shows the state which turned up. In FIG. 1B, the side seal portion 140 and the folded piece 150 shown in FIG. 1A are not shown in order to clarify the shape of the packaging container 100.

(Box state)
As shown in FIG. 1, in the packaging container 100 in a box shape, a gap (accommodating space) is formed by the upper surface 110, the lower surface 130, and the side surface 120. A side seal portion 140 and a folded piece 150 are provided along the outer peripheral surface of the side surface 120. In the packaging container 100, as an example, the side seal part 140 is along the side surface 120 in a state where the edge is directed to the upper surface 110 side.

  As shown in FIG. 1, the packaging container 100 in a box shape is formed so that the side surface 120 has a reverse taper shape that expands from the lower surface 130 side toward the upper surface 110 side.

(Flat state)
As shown in FIG. 2, the packaging container 100 in a flat state includes a first portion 170a and a second portion 170b that overlap each other. As shown in FIG. 3, the blank for forming the packaging container 100 includes a blank 101a corresponding to the first portion 170a and a blank 101b corresponding to the second portion 170b.

  The first portion 170a includes an upper surface 110, a plurality of upper isosceles trapezoidal surfaces 120a extending from each side of the upper surface 110, and a plurality of upper folded surfaces formed between the adjacent upper isosceles trapezoidal surfaces 120a. 150a, and an upper seal margin 140a that constitutes a peripheral portion of the outer periphery of the first portion 170a along the edge of the upper isosceles trapezoidal surface 120a and the upper folded surface 150a opposite to the upper surface 110. .

  The second portion 170b includes a lower surface 130, a plurality of lower isosceles trapezoidal surfaces 120b extending from each side of the lower surface 130, and a plurality of lower surfaces formed between adjacent lower isosceles trapezoidal surfaces 120b. A lower side that constitutes a peripheral portion over the entire circumference of the outer edge of the second portion 170b along the side folding surface 150b, the lower isosceles trapezoidal surface 120b, and the edge of the lower folding surface 150b opposite to the lower surface 130 And a seal margin 140b.

  The upper surface 110 and the lower surface 130 are convex polygonal surfaces. In the packaging container 100, as an example, the upper surface 110 and the lower surface 130 have a regular hexagonal shape, and the upper surface 110 is formed in a larger area than the lower surface 130. The shape of the upper surface 110 and the lower surface 130 is not limited as long as it is a convex polygonal shape. As the shapes of the upper surface 110 and the lower surface 130, in addition to the hexagons shown as the embodiment, a quadrangle is also useful from the viewpoint of stacking efficiency in a box shape, convenience of the members, and the like. An opening 111 is formed in the upper surface 110.

  The plurality of upper isosceles trapezoidal surfaces 120a and the plurality of lower isosceles trapezoidal surfaces 120b are surfaces constituting the side surface 120 of the packaging container 100 in a box shape, and the upper isosceles trapezoidal surfaces 120a and the lower isosceles legs. At least one of the trapezoidal surfaces 120b has an isosceles trapezoidal shape that is not rectangular.

  The upper isosceles trapezoidal surface 120 a extends from each side of the upper surface 110 (a surface having a convex polygonal shape), and one of the two parallel sides is defined as each side of the upper surface 110. Further, the lower isosceles trapezoidal surface 120 b extends from each side of the lower surface 130 (convex polygonal surface), and one of the two parallel sides is defined as each side of the lower surface 130. Further, as shown in FIG. 1B, the side on the upper seal margin 140a side of the upper isosceles trapezoid surface 120a and the side on the lower seal margin 140b side of the lower isosceles trapezoid surface 120b have the same length. Is formed.

  As shown in FIG. 1 (b), in the packaging container 100, as an example, the upper isosceles trapezoidal surface 120a is an isosceles table in which the length of the side on the upper surface 110 side is longer than the length of the side on the upper seal margin 140a side. Shape. Further, the lower isosceles trapezoidal surface 120b has an isosceles trapezoidal shape in which the length of the side on the lower seal margin 140b side is longer than the length of the side on the lower surface 130 side.

  Thus, the packaging container 100 is formed in a box-shaped state because the upper isosceles trapezoidal surface 120a and the lower isosceles trapezoidal surface 120b are formed in an isosceles trapezoidal shape that is not rectangular as described above. The side surface 120 has a reverse taper shape extending from the lower surface 130 side toward the upper surface 110 side. For this reason, according to this embodiment, the packaging container which has a shape with high designability can be provided.

  The upper folded surface 150a and the lower folded surface 150b are surfaces constituting the folded piece 150 of the packaging container 100 in a box shape, and are folded in the process of deformation described later.

  In order to facilitate folding in the process of deformation, the upper folded surface 150a and the lower folded surface 150b are formed from the first vertex 170a and the first portion from the vertices of the upper surface 110 and the lower surface 130 as indicated by dotted lines in FIG. You may provide the folding ruled line 151 extended toward the peripheral part of the 2 part 170b.

  The upper seal margin 140a and the lower seal margin 140b are band-like surfaces provided to connect the first portion 170a and the second portion 170b at the peripheral edge. When connecting the first portion 170a and the second portion 170b, the first portion 170a and the second portion 170b are overlapped with each other so that the upper seal margin 140a and the lower seal margin 140b are opposed to each other. Side seal portions 140 are formed by sealing and bonding the surfaces to be bonded together. The shapes of the upper seal margin 140a and the lower seal margin 140b may be arbitrarily set as long as they overlap with each other in order to form the side seal portion 140 by overlapping.

  The width of the side seal portion 140, that is, the width of the upper seal margin 140a and the lower seal margin 140b may be constant or constant as long as the first portion 170a and the second portion 170b can be connected. The end edge may not be linear. For example, as shown in FIG. 3, the widths of the upper seal margin 140a and the lower seal margin 140b are set to be larger than the upper folded surface 150a and the lower folded surface 150b, respectively, outside the upper folded surface 150a and the lower folded surface 150b. You may form so that it may spread outward at a predetermined angle toward the folding ruled line 151. By forming in this way, as shown in FIG. 1, when the packaging container 100 is in a box shape, the peripheral edge can be formed on a straight line parallel to each side of the upper surface 110 and the lower surface 130, Designability can be improved.

  More specifically, of the first portion 170a and the second portion 170b, the second portion 170b that includes the side surface 120 on the side where the side seal portion 140 does not follow when the packaging container 100 is in a box shape. The side of the lower isosceles trapezoidal surface 120b (side shared with the lower folded surface 150b) is extended to the peripheral edge, and two corners formed by the side and the peripheral edge (the corners a1 and a2 in FIG. 3). The lower seal margin 140b is formed so as to be equal. And about the upper seal margin 140a of the 1st part 170a, it can form in a congruent shape, for example so that it may overlap with the lower seal margin 140b.

  Note that, depending on the taper shape of the packaging container and the direction along which the side seal portion 140 is arranged, the widths of the upper seal margin 140a and the lower seal margin 140b may be set to the upper folded surface 150a and the lower folded surface as in the packaging container 200 described later. In some cases, it may become narrow outside 150b.

  The area to be sealed can be a belt-like area having a predetermined width as shown in FIG. 3 with hatching. The packaging container 100 formed in this way has airtightness except for the opening 111.

  The blanks 101a and 101b can be formed, for example, by cutting a sheet material into a predetermined shape and partitioning regions constituting each surface by providing ruled lines as shown by thin lines and dotted lines in FIG.

  Although it does not specifically limit as a sheet | seat material used for blank 101a, 101b, For example, the laminated | multilayer film which laminated | stacked the thermoplastic resin layer and the sealant layer on the paper base material layer can be used suitably. In addition to this, a barrier layer, a functional film, or the like may be appropriately added according to a required function.

(Deformation method)
Next, an example of a method for transforming a packaging container in a flat state into a box shape will be described using the packaging container 100. FIG. 4A to FIG. 4D are diagrams for explaining an example of a deformation method of the container body 100.

  First, as shown in FIG. 4 (a), the first portion 170a and the second portion 170b of the packaging container 100 in a flat state are placed at the peripheral portion (specifically, the side seal portion 140 and the upper side, etc. The first portion 170a and the second portion 170b are separated by bending (along the ruled line between the leg trapezoid surface 120a and the lower isosceles trapezoid surface 120b). Thereby, while forming a space | gap between the 1st part 170a and the 2nd part 170b, the upper surface 110, the lower surface 130, and the side surface 120 are formed. At the same time, the sides of the upper folded surface 150a and the lower folded surface 150b that are shared by the adjacent upper isosceles trapezoid surface 120a and lower isosceles trapezoid surface 120b approach each other. As a result, the upper folded surface 150a and the lower folded surface 150b are folded so that the folded ruled line 151 is directed outward from the gap, thereby forming folded pieces 150.

  Next, as shown in FIG. 4B, the side seal portion 140 is made to face the upper surface 110 along the side surface 120. The side seal portion 140 may be along the side surface 120 toward the lower surface 130.

  Next, as shown in FIG. 4C, the folded piece 150 is placed along the outer peripheral surface of the side surface 120. The direction in which the folded pieces 150 are arranged is not limited, and as shown in FIG. 4C, a plurality of folded pieces 150 may be arranged along the circumferential direction of the side surface 120 toward the same direction, Each folded piece 150 may be along different directions.

  At this time, the folded piece 150 may be attached to the surface of the side surface 120. Examples of a method for attaching the folded piece 150 to the side surface 120 include a method using a heat seal, a hot melt adhesive, or the like. Moreover, since the packaging container 100 deform | transformed from the box-shaped state to the flat state can be used again as a box-shaped state by sticking with a detachable joining member such as a hook-and-loop fastener, a snap button, etc. Thus, the packaging container 100 can be reused.

  By the above procedure, as shown in FIG. 4D, the packaging container 100 that has been in a flat state can be transformed into a box-shaped state.

  The box-shaped packaging container 100 can be made flat by a procedure opposite to that described above.

  Specifically, first, the folded piece 150 of the box-shaped packaging container 100 is detached from the side surface 120.

  Next, the first portion 170a and the second portion 170b are extended at the peripheral portion (specifically, along the ruled line between the side seal portion 140 and the side surface 120).

  Next, the gap between the first part 170a and the second part 170b is eliminated, and the first part 170a and the second part 170b are overlapped with each other, whereby the packaging container 100 is deformed into a flat state. can do.

<Second Embodiment>
FIG. 5 shows a perspective view (FIG. 5A) and a side view (FIG. 5B) of the packaging container 200 according to the second embodiment, and FIG. The top view of a certain blank 201a, 201b is shown. In FIG. 5B, the side seal part 140 and the folded piece 150 are not shown in order to clarify the shape of the packaging container 200. The blank 201a corresponds to the first portion 170a, and the blank 201b corresponds to the second portion 170b.

  The difference between the packaging container 100 and the packaging container 200 is the shape of the upper surface, the lower surface, and the side surface. Specifically, the side surface 120 of the packaging container 100 in a box shape is formed to expand from the lower surface 130 side toward the upper surface 110 side, whereas the side surface 220 of the packaging container 200 is shown in FIG. As shown in FIG. 4, the taper is formed in a forward tapered shape that expands from the upper surface 210 side toward the lower surface 230 side. Moreover, in the packaging container 200, the side seal part 140 is along the side surface 120 in the state in which the edge faced the lower surface 230 side as an example.

  As shown in FIG. 5B and FIG. 6, in the packaging container 200, the upper surface 210 and the lower surface 230 have a regular hexagonal shape, and the upper surface 210 is formed in a smaller area than the lower surface 230.

  Further, the side on the upper seal margin 140a side of the upper isosceles trapezoid surface 220a and the side on the lower seal margin 140b side of the lower isosceles trapezoid surface 220b are formed to have the same length. The upper isosceles trapezoidal surface 220a has an isosceles trapezoidal shape in which the length of the side on the upper surface 210 side is shorter than the length of the side on the upper seal margin 140a side. The lower isosceles trapezoidal surface 220b has an isosceles trapezoidal shape in which the length of the side on the lower seal margin 140b side is shorter than the length of the side on the lower surface 230 side. Since the packaging container 200 has a forward tapered shape in a box shape, and the edge of the side seal part 140 faces the lower surface 230 side and extends along the side surface 120, as described above, the upper seal margin 140a and The width of the lower seal margin 140b is formed to expand outward at a predetermined angle outside the upper folded surface 150a and the lower folded surface 150b.

  In this way, the packaging container 200 is in a box shape because the upper isosceles trapezoidal surface 220a and the lower isosceles trapezoidal surface 220b are formed in an isosceles trapezoidal shape that is not a rectangle having the above dimensions. Sometimes, the side surface 220 expands from the upper surface 210 side toward the lower surface 230 side. For this reason, according to this embodiment, the packaging container which has a shape with high designability can be provided. The packaging container 200 can be deformed between a box-shaped state and a flat state by the same procedure as the packaging container 100.

<Third Embodiment>
FIG. 7 shows a perspective view (FIG. 7A) and a side view (FIG. 7B) of a packaging container 300 according to the third embodiment, and FIG. The top view of a certain blank 301a, 301b is shown. In FIG. 7B, the side seal part 140 and the folded piece 150 are not shown in order to clarify the shape of the packaging container 300. The blank 301a corresponds to the first portion 170a, and the blank 301b corresponds to the second portion 170b.

  The difference between the packaging container 100 and the packaging container 300 is the shape of the upper surface, the lower surface, and the side surface. Specifically, as shown in FIG. 7, the side surface 320 of the packaging container 300 is formed in a forward tapered shape in which the upper isosceles trapezoidal surface 320 a extends toward the upper surface 300, and the lower isosceles trapezoidal surface 320 b is the lower surface 130. It is formed in the reverse taper shape which spreads toward the side. Therefore, the packaging container 300 has a constriction between the upper isosceles trapezoid surface 120a and the lower isosceles trapezoid surface 120b as shown in FIG. Moreover, in the packaging container 300, as an example, the side seal part 140 is along the side surface 120 in a state where the edge is directed to the lower surface 330 side.

  As shown in FIGS. 7B and 8, in the packaging container 300, the upper surface 310 and the lower surface 330 are formed in a congruent regular hexagonal shape.

  The side on the upper seal margin 140a side of the upper isosceles trapezoid surface 320a and the side on the lower seal margin 140b side of the lower isosceles trapezoid surface 320b are formed to have the same length. The upper isosceles trapezoidal surface 320a has an isosceles trapezoidal shape in which the length of the side on the upper surface 310 side is longer than the length of the side on the upper seal margin 140a side. The lower isosceles trapezoidal surface 320b has an isosceles trapezoidal shape in which the length of the side on the lower surface 330 side is longer than the length of the side on the side seal margin 140b side.

  In this way, the packaging container 300 is in a box shape because the upper isosceles trapezoidal surface 320a and the lower isosceles trapezoidal surface 320b are formed in an isosceles trapezoidal shape that is not a rectangle having the above dimensions. In some cases, the upper isosceles trapezoidal surface 120a and the lower isosceles trapezoidal surface 120b are constricted. For this reason, according to this embodiment, the packaging container which has a shape with high designability can be provided. The packaging container 300 can be deformed between a box-shaped state and a flat state by the same procedure as the packaging container 100.

<Modification>
In the above embodiment, although the example which forms a packaging container using two blanks corresponding to the 1st part 170a and the 2nd part 170b was shown, you may form these blanks integrally. FIG. 9 shows a blank 102 according to a modification. As shown in FIG. 9, the blank 102 has a peripheral portion of the blank corresponding to the first portion 170 a and the second portion 170 b connected by a connecting portion 180.

  When forming the packaging container 100 using the blank 102, for example, the first portion 170a and the second portion 170b whose peripheral portions are formed in a circular shape are overlapped by folding back at the connection portion 180, and then, The upper seal margin 140a and the lower seal margin 140b are sealed. By forming blanks in this way, for example, when blanks are formed by punching a sheet material, many blanks can be punched from a single sheet material, so that a packaging container can be manufactured at a low cost. Can do.

  Note that when the first portion 170a and the second portion 170b of the packaging container 100 formed using the blank 102 are pulled apart and deformed into a box shape, the connecting portion 180 is extended. Moreover, when deform | transforming into a flat state, the connection part 180 is folded back.

  The embodiment of the present invention may be implemented by appropriately combining the features of the embodiment. For example, the upper isosceles trapezoidal surface 120a of the packaging container 100 and the lower isosceles trapezoidal surface 220b of the packaging container 200 are combined to form an upper isosceles trapezoidal surface 120a and a lower isosceles trapezoidal surface 220b in a box shape. It is good also as a barrel-shaped packaging container in which the connection part bulges outward.

  In the embodiment of the present invention, at least one of the upper isosceles trapezoidal surface and the lower isosceles trapezoidal surface may be an isosceles trapezoidal shape that is not rectangular. One of the trapezoidal surfaces may be rectangular (square or rectangular), and the other may be an isosceles trapezoid that is not rectangular. Thereby, in the box-shaped state, either the upper side or the lower side 120 of the connecting portion between the upper isosceles trapezoidal surface and the lower isosceles trapezoidal surface has either a forward or reverse tapered shape, and the other side surface. 120 can be a packaging container that does not have a tapered shape.

  Moreover, you may attach a spout to the opening 111 of the packaging container of this invention. By attaching a spout capable of attaching a cap to the opening 111, the opening 111 can be easily sealed. Further, by attaching a spout, for example, a packaging container folded in a flat state can be transformed into a box shape and filled with contents such as liquid, and then the opening 111 can be sealed using a cap or the like. For this reason, for example, there is no sealing process for ensuring hermeticity in the content filling line, and it is not necessary to guarantee the sealing performance in the filling line. For this reason, if the packaging container of this invention is used, it will become possible to fill a content efficiently.

  Further, according to the packaging container of the present invention, since the packaging container can be transported in a flat state, the packaging container can be loaded efficiently, and transportation and storage costs can be reduced.

  The present invention can be suitably used for a packaging container.

100, 200, 300 Packaging container 101a, 101b, 102, 201a, 201b, 301a, 301b Blank 110, 210, 310 Upper surface 111 Opening 120, 220, 320 Side surface 120a, 220a, 320a Upper isosceles trapezoid surface 120b, 220b, 320b Lower isosceles trapezoidal surface 130, 230, 330 Lower surface 140 Side seal portion 140a Upper seal allowance 140b Lower seal allowance 150 Folded piece 150a Upper folded surface 150b Lower folded surface 151 Folded ruled line 170a First portion 170b Second portion 180 connections

Claims (2)

A packaging container formed of a sheet material and deformable between a box-shaped state and a flat state,
A first portion and a second portion that overlap each other in the flat state;
An opening is formed in the first portion;
The first part and the second part are each a convex polygonal convex polygonal surface and each side of the convex polygonal surface, and each side is one of two parallel sides. An isosceles trapezoid-shaped isosceles trapezoidal surface, a plurality of folding surfaces provided between each of the adjacent isosceles trapezoidal surfaces, and a peripheral edge over the entire circumference of the outer edge,
The isosceles trapezoidal surface that at least one of the first part and the second part has is an isosceles trapezoidal shape that is not rectangular;
The first part and the second part are:
In the peripheral part, the side seal part sealed with each other, or connected by either the connection part folded back the sheet material, has a sealing property except the opening,
In the flat state,
The sheet material is bent at the peripheral edge portion, or further, the sheet material is extended at the connection portion to form a gap between the first portion and the second portion, and the first portion A taper formed by an upper surface that is the convex polygonal surface including the opening of a portion, a lower surface that is the convex polygonal surface of the second portion and faces the upper surface, and an isosceles trapezoidal surface that is not rectangular. A plurality of side surfaces including a surface, and a folded piece obtained by folding the folded surface and the peripheral portion,
By folding the folded piece along the side surface, it can be transformed into the box-shaped state,
In the box-shaped state,
Separating the folded piece from the side surface;
Extending the folded piece,
Extending the sheet material at the peripheral edge, or further folding back the sheet material at the extended connecting portion to eliminate the gap between the first portion and the second portion;
A packaging container that can be transformed into the flat state by overlapping the first part and the second part.   The packaging according to claim 1, wherein at least a part of the first part or the second part in the box-shaped state and a part overlapping with the side part have a detachable joining member. container.

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