JP7272038B2 - How to assemble a packaging container - Google Patents

Description

The present invention relates to a method of assembling a packaging container.

A packaging container is known that is formed by folding a sheet material into a box shape and overlapping and sealing the ends of the sheet material.

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

JP-A-9-290822

Since the packaging container of Patent Document 1 is easy to dismantle for disposal, it is useful for reducing the volume of waste, but once dismantled packaging containers cannot be assembled and reused. For this reason, there is room for investigation into a packaging container that can be reused by returning it to a box-like state even after it has been flattened once, and a method of assembling the packaging container.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems, and it is an object of the present invention to provide a method for assembling a packaging container that can be reused by returning it to a box-like state even after it has been flattened once. With the goal.

One aspect of the present invention for solving the above problems is a method for assembling a packaging container, comprising a flat plate-shaped first portion and a second portion overlapping each other, the first portion and the second portion are respectively adjacent to a convex polygonal face and an isosceles trapezoidal face extending from each side of the convex polygonal face and having each side as one of two parallel sides. A packaging container having a plurality of folded surfaces provided between the isosceles trapezoidal surfaces and a peripheral edge portion extending over the entire circumference of the outer edge is prepared, and the first portion and the first portion are connected to each other along the entire circumference of the peripheral edge portion. A gap is formed between the two parts and the folded surface is folded to form a folded piece, so that the packaging container is divided into the convex polygonal surface of the first part and the convex polygonal surface of the second part. A step of forming a box shape including a lower surface that is a surface facing the upper surface and a side surface formed by an isosceles trapezoidal surface , sealing the packaging container, and heating the gas inside the space to reduce the pressure inside the space A method of assembling a packaging container, comprising the step of attaching the folded piece to the side while keeping the pressure higher than the external atmospheric pressure

ADVANTAGE OF THE INVENTION According to this invention, the assembly method of the packaging container which can be reused by returning to a box-shaped state again even after flattening once can be provided.

The perspective view which shows the state of the box type of the packaging container which concerns on one Embodiment of this invention. The perspective view which shows the flat state of the packaging container which concerns on one Embodiment of this invention. 1 is a plan view of a packaging container blank according to an embodiment of the present invention; FIG. Figures showing each step of a method for transforming a packaging container according to one embodiment of the present invention A plan view showing a modification of the blank

[Packaging container]
First, a packaging container 100 according to an embodiment of the present invention will be described with reference to the drawings. In the following description, the same reference numerals are given to the same or corresponding configurations in each embodiment and each modified example, and description thereof will be omitted as appropriate. In addition, in the following description, for the sake of convenience, the vertical direction when the packaging container is erected in a box shape is referred to as the vertical direction.

The packaging container 100 is a container that is deformable between a box-shaped state and a flat state, and is formed by overlapping and sealing the ends of blanks obtained by cutting a sheet material into a predetermined shape.

(box-shaped state)
FIG. 1 shows a perspective view of a packaging container 100 in a box-shaped state. As shown in FIG. 1(a), the box-shaped packaging container 100 has an upper surface 110, a lower surface 130, a side surface 120, and side seal portions 140 formed by overlapping and sealing the ends of sheet materials. , and a folded piece 150 formed by folding a sheet material. The packaging container 100 has an upper surface 110 , a lower surface 130 and a side surface 120 forming a gap (accommodating space). The folded piece 150 extends outward from the corner of the side surface 120 and is bent along the outer peripheral surface of the side surface 120 . The side seal portion 140 extends outward from the vertical center of the side surface 120 and the folded piece 150 and is bent along the outer peripheral surfaces of the side surface 120 and the side seal portion 140 . In the packaging container 100 , as an example, the side seal portion 140 extends along the side surface 120 and the folded piece 150 with the edge facing toward the bottom surface 130 . An opening 111 is formed in the upper surface 110, and a spout 112 is attached to the opening 111 as an example.

(flat state)
FIG. 2 shows a perspective view of the packaging container 100 in a flat state, and FIG. 3 shows a plan view of a blank of the packaging container 100. As shown in FIG. As shown in FIG. 2, the packaging container 100 in a flat state is composed of a flat plate-shaped first portion 170a and a flat plate-shaped second portion 170b overlapping each other. As shown in FIG. 3, the blank for forming the packaging container 100 is composed of a blank 101a corresponding to the first portion 170a and a blank 101b corresponding to the second portion 170b. 2A is a view of the packaging container 100 viewed from the top surface 110 side, and FIG. 2B is a view of the packaging container 100 viewed from the bottom surface 130 side. Moreover, (a) of FIG. 3 is a plan view of the blank 101a, and (b) of FIG. 3 is a plan view of the blank 101b.

The first portion 170a includes an upper convex polygonal surface 110a in which an opening 111 is formed, a plurality of upper isosceles trapezoidal surfaces 120a extending from each side of the upper convex polygonal surface 110a, and adjacent upper isosceles trapezoidal surfaces 120a. A plurality of upper folded surfaces 150a formed between the trapezoidal surfaces 120a, and along the edge of the upper isosceles trapezoidal surface 120a and the upper folded surface 150a opposite the upper convex polygonal surface 110a, a first portion 170a. and an upper seal margin 140a forming a peripheral edge portion extending over the entire circumference of the outer edge of the .

The second portion 170b includes a lower convex polygonal surface 130a, a plurality of lower isosceles trapezoidal surfaces 120b extending from each side of the lower convex polygonal surface 130a, and each adjacent lower isosceles trapezoidal surface. 120b, and along the edges of the lower isosceles trapezoidal surface 120b and the lower folded surface 150b opposite to the lower convex polygonal surface 130a, a second and a lower seal allowance 140b forming a peripheral edge portion extending all around the outer edge of the portion 170b.

The upper convex polygonal surface 110a and the lower convex polygonal surface 130a are the upper surface 110 and the lower surface 130 of the packaging container 100 in the box-like state, respectively. The shape of the upper convex polygonal surface 110a and the lower convex polygonal surface 130a is not limited as long as they are convex polygonal surfaces, and in the packaging container 100, as an example, they are congruent rectangular shapes. For example, the upper convex polygonal surface 110a and the lower convex polygonal surface 130a may have similar shapes with different areas.

The plurality of upper isosceles trapezoidal surfaces 120a and the plurality of lower isosceles trapezoidal surfaces 120b are surfaces that form the side surfaces 120 of the packaging container 100 in the box-like state. The upper isosceles trapezoidal surface 120a and the lower isosceles trapezoidal surface 120b are not limited in shape as long as they are isosceles trapezoidal shapes. It is rectangular. At least one of the upper isosceles trapezoidal surface 120a and the lower isosceles trapezoidal surface 120b may have a non-rectangular isosceles trapezoidal shape. The upper isosceles trapezoidal surface 120a and the lower isosceles trapezoidal surface 120b are provided corresponding to the number of sides of the upper convex polygonal surface 110a and the lower convex polygonal surface 130a. and the shape of the lower convex polygonal surface 130 . In the packaging container 100, four upper isosceles trapezoidal surfaces 120a and four lower isosceles trapezoidal surfaces 120b are provided.

As shown in FIGS. 2 and 3, the upper isosceles trapezoidal surface 120a extends from each side of the upper convex polygonal surface 110a, and one of the two parallel sides extends from each side of the upper convex polygonal surface 110a. and The lower isosceles trapezoidal surface 120 b extends from each side of the lower convex polygonal surface 130 a , and one of the two parallel sides is used as each side of the lower convex polygonal surface 130 . The side of the upper isosceles trapezoidal surface 120a on the side of the upper seal allowance 140a and the side of the lower isosceles trapezoidal surface 120b on the side of the lower seal allowance 140b are formed to have the same length.

The upper folding surface 150a and the lower folding surface 150b are surfaces that become the folded pieces 150 of the box-shaped packaging container 100, and are surfaces that are folded in the deformation process described later. Upper and lower fold surfaces 150a and 150b are formed between each adjacent upper and lower isosceles trapezoidal surfaces 120a and 120b, respectively, so that their number is equal to the upper and lower isosceles trapezoidal surfaces 120a and 120b. It is determined by the number of lateral isosceles trapezoidal surfaces 120b. In the packaging container 100, four upper folded surfaces 150a and four lower folded surfaces 150b are provided. In the packaging container 100, as an example, folding lines 151 extending from the vertices of the upper convex polygonal surface 110a and the lower convex polygonal surface 130a toward the peripheral edges of the first portion 170a and the second portion 170b are formed. It is provided on the upper folded surface 150a and the lower folded surface 150b. By providing folding ruled lines 151, it becomes possible to easily fold the upper folding surface 150a and the lower folding surface 150b at desired positions.

The upper seal allowance 140a and the lower seal allowance 140b are belt-shaped surfaces provided to connect the first portion 170a and the second portion 170b at their peripheral edges. When connecting the first portion 170a and the second portion 170b, the first portion 170a and the second portion 170b are superimposed on each other, and the upper sealing margin 140a and the lower sealing margin 140b are connected to each other. A side seal portion 140, which is a peripheral portion, is formed by sealing, bonding, or the like the opposing surfaces. The shape of the upper sealing margin 140a and the lower sealing margin 140b can be arbitrarily set as long as there is a sealing margin that overlaps each other in order to form the side seal portion 140 by overlapping. In the packaging container 100, as an example, in order to facilitate bending of the side seal portion 140 in the process of deformation described later, there is a gap between the lower seal margin 140b and the lower isosceles trapezoidal surface 120b and the lower folded surface 150b. Ruled lines 160 are provided. The packaging container 100 formed by mutually sealing the upper sealing margin 140a and the lower sealing margin 140b has airtightness except for the opening 111. As shown in FIG.

The blanks 101a and 101b are formed by cutting a sheet material into a predetermined shape. The blanks 101a and 101b may be provided with ruled lines for partitioning each surface, as shown by thin lines in FIG. 3, for example.

The sheet material used for the blanks 101a and 101b is not particularly limited, but for example, a laminated film obtained by laminating a thermoplastic resin layer or a sealant layer on a paper base layer can be preferably used. In addition to these, a barrier layer, a functional film, or the like may be added as appropriate depending on the required functions.

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

First, as shown in (a) of FIG. 4, the first portion 170a or the second portion 170b of the packaging container 100 in a flat state is attached at the periphery (specifically, the upper side seal portion 140a and the upper side seal portion 140a). between the isosceles trapezoidal surface 120a and the upper folded surface 150a, or between the lower side seal portion 140b and the lower isosceles trapezoidal surface 120b and the lower folded surface 150b) to separate the first portion 170a and the second portion 170a. 2 portion 170b is pulled away. As a result, a gap is formed between the first portion 170a and the second portion 170b, and the upper convex polygonal surface 110a becomes the upper surface 110, the lower convex polygonal surface 130a becomes the lower surface 130, and the upper isosceles. The trapezoidal surface 120a and the lower isosceles trapezoidal surface 120b become the side surfaces 120, and the upper side seal portion 140a and the lower side seal portion 140b become the side seal portions 140, thereby forming the packaging container 100 into a box shape.

Further, as shown in FIG. 4B, the sides of the plurality of upper folded surfaces 150a that are shared with the adjacent upper isosceles trapezoidal surface 120a are closer to each other, and the plurality of lower folded surfaces 150b are closer to each other. The sides that are shared with the trapezoidal surface 120b are brought closer together. As a result, the upper folded surface 150 a and the lower folded surface 150 b are folded to form the folded piece 150 . At the same time, as indicated by the arrow, the side seal portion 140 is folded along the ruled line 160 so that the edge thereof faces the lower surface 130 and extends along the side surface 120 . The side seal portion 140 may be bent along the side surface 120 so that the edge faces the upper surface 110 . In this case, by forming the ruled line 160 in the first portion 170a, the side seal portion 140 can be easily bent.

Next, the folding piece 150 is attached to the side surface 120 while making the air pressure inside the gap higher than the outside air pressure. Specifically, as shown in FIG. 4C as an example, a nozzle 300 capable of blowing gas is inserted into the spout 112, and the gas is blown out from the nozzle 300 to form the upper convex polygonal surface 110a. The folding piece 150 is folded along the outer peripheral surface of the side surface 120 while blowing air into the gap through the opening 111 formed. The direction in which the folded pieces 150 are laid is not limited, and as an example, two folded pieces 150 may be laid along one side surface 120 as shown in FIG. It may run along side 120 . In this case, the packaging container 100 can be fixed, for example, on a mounting table (not shown), and the folding piece 150 can be folded by a jig (not shown).

At this time, as a method of attaching the folded piece 150 to the side surface 120, for example, there is a method using a heat seal, a hot-melt adhesive, or the like.

In this way, when the folding piece 150 is attached to the side surface 120, the air pressure inside the gap is set to be higher than the outside air pressure. can be inflated. Thereby, the gap generated between the folded piece 150 and the side surface 120 can be reduced, and the melted sealant or adhesive between the folded piece 150 and the side surface 120 can be spread widely. As a result, it is possible to provide the packaging container 100 in which the fold-back piece 150 and the side surface 120 are less likely to separate from each other by widening the area to which the sealant or adhesive adheres.

The method for making the air pressure inside the gap higher than the air pressure outside is not limited to the above-described method, and for example, the gas inside the gap may be heated. Specifically, for example, after closing the opening 111 and sealing the packaging container 100, the gas inside the gap can be heated from the outside using hot air or the like. As a result, the gas inside the heated gap thermally expands, so that the side surface 120 can bulge outward. According to this method, the melting of the sealant and the heating of the gas inside the gap can be performed using one hot air, so the process for deforming the packaging container 100 can be simplified.

Alternatively, the pressure inside the gap may be made higher than the pressure outside by reducing the pressure outside the gap. Specifically, for example, the packaging container 100 with the opening 111 closed and sealed is placed in a decompression chamber capable of reducing the internal pressure, and the pressure inside the decompression chamber is made lower than the pressure inside the gap. . As a result, the side surface 120 can bulge outward due to the pressure difference between the outside and the inside of the gap.

By the above procedure, as shown in FIG. 4D, the flat packaging container 100 can be transformed into a box shape.

The packaging container 100 in the box-shaped state can be flattened by the reverse procedure of the above-described procedure. Specifically, first, the folding piece 150 of the box-shaped packaging container 100 is separated from the side surface 120 . Next, the first portion 170a and the second portion 170b are stretched at the peripheral portion (more specifically, along between the side seal portion 140 and the side surface 120). Next, by eliminating the gap between the first portion 170a and the second portion 170b and overlapping the first portion 170a and the second portion 170b, the packaging container 100 is transformed into a flat state. can do.

(Variation of blank)
In the above example, the packaging container 100 is formed using two blanks 101a and 101b corresponding to the first portion 170a and the second portion 170b. good too. In the blank 102 shown in FIG. 5, a part of the peripheral edge of the blank corresponding to the first portion 170a and the second portion 170b is connected by the connecting portion 180. As shown in FIG.

When forming the packaging container 100 using the blank 102, the first portion 170a and the second portion 170b are overlapped by, for example, folding back at the connection portion 180, and then the upper sealing margin 140a and the lower sealing margin 140a are formed. Seal 140b. By integrally forming the blanks in this way, for example, when blanks are formed by punching sheet materials, many blanks can be punched from one sheet material, so that packaging containers can be manufactured at low cost. can be done.

When the first portion 170a and the second portion 170b of the packaging container formed using the blank 102 are pulled apart to deform into a box shape, the connecting portion 180 is extended. Also, when deformed into a flat state, the connecting portion 180 is folded back.

As described above, since the packaging container 100 can be easily transformed from a flat state to a box-shaped state, it can be reused by returning to the box-shaped state even after being flattened once. is. In addition, since the packaging container 100 can be flattened and transformed into a box shape as needed, the loading efficiency is high during transportation, and transportation and storage costs can be reduced.

The packaging container 100 was deformed into a box shape using the packaging container assembling method according to the example and the comparative example, and the areas where the side surfaces 120 and the folded pieces 150 adhered were compared. The sheet material used for the packaging container 100 was formed by laminating polyethylene (50 μm)/paper (300 g/m ² )/polyethylene (25 μm)/polyethylene terephthalate (12 μm)/polyethylene (50 μm) in order from the outside.

(Example)
In the assembly method according to the embodiment, after forming the side surface 120 and the folding piece 150 by the deformation method shown in FIGS. 4, gas was supplied from the air nozzle 300 to make the air pressure inside the gap higher than the air pressure outside. After that, the folded piece 150 was attached to the surface of the side surface 120 while continuing to supply the gas from the air nozzle 300 .

(Comparative example)
In the assembly method according to the comparative example, after forming the side surface 120 and the folding piece 150 by the deformation method shown in FIGS. , and the folded piece 150 was attached to the surface of the side surface 120 without supplying gas.

(Evaluation results)
The folded piece 150 of the packaging container 100 formed by the above method is peeled off from the surface of the side surface 120, and the polyethylene layer on the outer surface of the side surface 120 and the folded piece 150 is adhered and integrated, so that the paper layer at the peeled place is The area of the exposed area was measured.

The area of the exposed paper layer of the packaging container 100 assembled using the assembly method according to the example was 21 cm ² . On the other hand, the area of the exposed paper layer of the packaging container 100 assembled using the assembly method according to the comparative example was 9 cm ² . From the above results, by attaching the folded piece 150 to the side surface 120 while keeping the air pressure inside the gap higher than the outside air pressure, the adhesive area is widened, and the packaging container 100 in which the folded piece 150 is difficult to peel off can be obtained. It was confirmed that it can be provided.

INDUSTRIAL APPLICABILITY The present invention can be suitably used for manufacturing a packaging container formed by folding a sheet material into a box shape, overlapping the ends, and sealing.

100 packaging container 101a, 101b blank 110 upper surface 110a upper convex polygonal surface 111 opening 120 side surface 120a upper isosceles trapezoidal surface 120b lower isosceles trapezoidal surface 130 lower surface 130a lower convex polygonal surface 140 side seal portion 140a upper seal margin 140b Lower sealing allowance 150 Folded piece 150a Upper folded surface 150b Lower folded surface 151 Folded line 170a First part 170b Second part 180 Connection part 300 Nozzle

Claims (1)

A method for assembling a packaging container,
a flat plate-shaped first portion and a second portion that overlap each other, the first portion and the second portion respectively forming a convex polygonal surface and each side of the convex polygonal surface; an isosceles trapezoidal surface extending from and having each side being one of two parallel sides, a plurality of folded surfaces provided between the adjacent isosceles trapezoidal surfaces, and an outer edge A packaging container is prepared that has a peripheral edge that extends over the entire circumference of the peripheral edge and is connected to each other along the entire circumference of the peripheral edge, forming a gap between the first portion and the second portion, and the folded surface is folded to form a folded piece, and the packaging container is folded into an upper surface which is the convex polygonal surface of the first portion and a lower surface which is the convex polygonal surface of the second portion and faces the upper surface and a side surface formed by the isosceles trapezoidal surface;
A step of sealing the packaging container and heating the gas inside the gap to make the pressure inside the gap higher than the pressure outside, and sticking the folded piece to the side surface.
How to assemble a packaging container.

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