JP2021133957A - Method of assembling packaging container - Google Patents

Abstract

To provide a method of assembling a packaging container which can appropriately assemble the packaging container in a flat state and in an empty box-shape state, while suppressing a molding defect.SOLUTION: A method of assembling a packaging container includes: a step of preparing a packaging container which has a first part and a second part in flat plate shapes, in which the first part and the second part each have convex polygonal surfaces, trapezoidal surfaces, a plurality of folded-back surfaces and peripheral edge parts extending over the whole circumference, and are connected to one another on the whole circumference of the peripheral edge parts, and arranging a plurality of pressing jigs; and a step of moving the plurality of pressing jigs in a direction along a surface in a flat plate shape while making the pressing jigs contact the peripheral edge parts, and forming a void between the first part and the second part to form a folded-back piece, so as to deform the packaging container into a box shape. In the step of forming the packaging container into the box shape, the plurality of pressing jigs move so that relative positions thereof with respect to inner ends of the peripheral edge parts do not change, together with movement due to a deformation of the packaging container, of the inner ends of the peripheral edge parts in contact with the jigs.SELECTED DRAWING: Figure 6

Description

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

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

For example, Patent Document 1 discloses a packaging container in which a spout is provided on a gable top type (gable roof type) roof plate so that the content liquid can be poured out.

JP-A-2002-284155

Conventionally, the manufacturing process of such a packaging container is typically a step of folding the sheet material so that the two opposite side edges of the sheet material overlap each other and sealing the overlapping two side edges to manufacture a sleeve. It is divided into a process of transporting the sleeve in a flat state without bulkiness and a process of sealing each end of the sleeve and folding it to form a bottom and a top to complete a packaging container when filling the contents. .. The process of completing the packaging container is generally performed in a facility different from the process of manufacturing the sleeve, and each facility requires a device for sealing or the like.

Therefore, if all the parts of the sheet material that need to be sealed are sealed in advance to manufacture a packaging container with sealing properties, and if it is made into a flat form, it can be transported in a state that is not bulky as before, and the contents. When filling the product, it is only necessary to assemble it into a box shape without sealing, and the equipment cost for filling the contents can be reduced. However, a method of assembling the packaging container from a flat state to a box-shaped state has not been sufficiently studied, and it has been an issue to suppress molding defects such as wrinkles.

The present invention has been made in view of such problems, and an object of the present invention is to provide a method for appropriately assembling a packaging container in a flat state into a box shape.

One aspect of the present invention for solving the above problems is a method of assembling a packaging container, which comprises a first portion and a second portion of a flat plate shape overlapping with each other, and the first portion and the second portion. Is a convex polygonal surface, a trapezoidal trapezoidal surface that extends from each side of the convex polygonal surface, and each side is one of two parallel sides, and an adjacent trapezoidal surface. A packaging container having a plurality of folded surfaces provided between them and a peripheral edge portion covering the entire circumference of the outer edge and connected to each other on the entire circumference of the peripheral edge portion is prepared, and each of the first portion and the second portion is convex. A separation mechanism that moves the polygonal surfaces so as to separate from each other in the thickness direction is arranged so as to sandwich the first portion and the second portion from the thickness direction, and abuts on the peripheral edge portion to move the peripheral edge portion in a predetermined direction. By the step of arranging a plurality of pressing jigs for pressing toward the edge so as to surround the peripheral edge and the separation mechanism, the convex polygonal surfaces of the first portion and the second portion are separated from each other in the thickness direction. By pressing the peripheral edge portion in the direction along the flat plate-shaped surface with a plurality of pressing jigs while moving, a gap is formed between the first portion and the second portion and the folded surface is formed. The packaging container is formed by folding to form a folded piece, and the packaging container is formed by an upper surface which is a convex polygonal surface of the first part, a lower surface which is a convex polygonal surface of the second part and faces the upper surface, and a trapezoidal surface. In the step of making the packaging container into a box shape, including the step of making the packaging container into a box shape including the side surface, the plurality of pressing jigs accompany the movement of the inner end of the peripheral edge portion in contact with each other due to the deformation of the packaging container. Then, it is a method of assembling a packaging container that moves so that the relative position of the peripheral edge with respect to the inner end does not change.

According to the present invention, it is possible to provide a method for appropriately assembling a flat packaging container into a box shape.

A perspective view showing a box-shaped state of a packaging container that can be used in the method for assembling a packaging container according to an embodiment of the present invention. A perspective view showing a flat state of a packaging container that can be used in the method for assembling a packaging container according to an embodiment of the present invention. Top view of a blank of a packaging container that can be used in the method of assembling a packaging container according to an embodiment of the present invention. The figure which shows each process of the method of the packaging container which can be used in the method of assembling the packaging container which concerns on one Embodiment of this invention. Top view showing a modified example of the blank The figure explaining the method of assembling the packaging container which concerns on one Embodiment of this invention. The figure explaining the method of assembling the packaging container which concerns on a reference form. The figure explaining the method of assembling the packaging container which concerns on one Embodiment of this invention. The figure explaining the method of assembling the packaging container which concerns on one Embodiment of this invention.

[Packaging container]
First, the packaging container 100, which is a packaging container that can be used in the method for assembling the packaging container according to the embodiment of the present invention, will be described with reference to the drawings. In the following description, the same or corresponding configurations will be designated by the same reference numerals in the respective embodiments and the description thereof will be omitted as appropriate. Further, in the following description of the packaging container, for convenience, the vertical direction in which the packaging container is upright as a box-shaped state is defined as the vertical direction.

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

(Box type)
FIG. 1 shows a perspective view of the packaging container 100 in a box-shaped state. As shown in FIG. 1, the box-shaped packaging container 100 includes a top surface 110, a bottom surface 130, a side surface 120, a side seal portion 140 in which the end portions of the sheet material are overlapped and sealed, and a sheet material. Includes a folded piece 150 formed by folding. In the packaging container 100, a gap (accommodation space) is formed by the upper surface 110, the lower surface 130, and the side surface 120. 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 center in the vertical direction 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 is along the side surface 120 and the folded piece 150 with the end edge facing the lower surface 130 side. An opening 111 is formed in the upper surface 110, and a spout 112 is attached to the opening 111 by welding 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. 2, the packaging container 100 in a flat state is composed of a first portion 170a and a second portion 170b in the shape of flat plates that overlap 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. Note that FIG. 2A is a view of the packaging container 100 viewed from the upper surface 110 side, and FIG. 2B is a view of the packaging container 100 viewed from the lower surface 130 side. Further, FIG. 3A is a plan view of the blank 101a, and FIG. 3B is a plan view of the blank 101b.

The first portion 170a is formed of an upper convex polygonal surface 110a in which an opening 111 is formed, a plurality of upper trapezoidal surfaces 120a extending from each side of the upper convex polygonal surface 110a, and adjacent upper trapezoidal surfaces 120a. Along the plurality of upper folded surfaces 150a formed between them and the end edges of the upper trapezoidal surface 120a and the upper folded surface 150a opposite to the upper convex polygonal surface 110a, over the entire circumference of the outer edge of the first portion 170a. Includes the upper seal allowance 140a constituting the peripheral edge portion.

The second portion 170b is between the lower convex polygonal surface 130a, the plurality of lower trapezoidal surfaces 120b extending from each side of the lower convex polygonal surface 130a, and the adjacent lower trapezoidal surfaces 120b. All of the outer edges of the second portion 170b along the plurality of formed lower folded surfaces 150b and the edges opposite the lower trapezoidal surface 120b and the lower convex polygonal surface 130a of the lower folded surface 150b. Includes a lower seal allowance 140b that constitutes the peripheral edge over the circumference.

The upper convex polygonal surface 110a and the lower convex polygonal surface 130a are surfaces that are the upper surface 110 and the lower surface 130 of the packaging container 100 in the box shape, 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 have a congruent rectangular shape. As an example, the upper convex polygonal surface 110a and the lower convex polygonal surface 130a may have similar shapes having different areas.

The plurality of upper trapezoidal surfaces 120a and the plurality of lower trapezoidal surfaces 120b are surfaces that become side surfaces 120 of the packaging container 100 in a box-shaped state. The shape of the upper trapezoidal surface 120a and the lower trapezoidal surface 120b is not limited as long as they are trapezoidal, and in the packaging container 100, the upper trapezoidal surface 120a and the lower trapezoidal surface 120b are rectangular as an example. At least one of the upper trapezoidal surface 120a and the lower trapezoidal surface 120b may have a non-rectangular trapezoidal shape. Since the upper trapezoidal surface 120a and the lower 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, the numbers are the upper convex polygonal surface 110a and the lower convex polygonal surface 110a. It depends on the shape of the polygonal surface 130a. In the packaging container 100, four upper trapezoidal surfaces 120a and four lower trapezoidal surfaces 120b are provided.

As shown in FIGS. 2 and 3, the upper trapezoidal surface 120a extends from each side of the upper convex polygonal surface 110a, and one of the two parallel sides is defined as each side of the upper convex polygonal surface 110a. .. Further, the lower trapezoidal surface 120b extends from each side of the lower convex polygonal surface 130a, and one of the two parallel sides is set as each side of the lower convex polygonal surface 130a.

The upper folded surface 150a and the lower folded surface 150b are surfaces that become folded pieces 150 of the packaging container 100 in a box-shaped state, and are surfaces that are folded in the process of deformation described later. Since the upper folded surface 150a and the lower folded surface 150b are formed between the adjacent upper trapezoidal surfaces 120a and the lower trapezoidal surfaces 120b, respectively, the number thereof is the number of the upper trapezoidal surfaces 120a and the lower trapezoidal surfaces 120b. Depends on. 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, a folded ruled line 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 is provided. It is provided on the upper folded surface 150a and the lower folded surface 150b. By providing the folded ruled line 151, the upper folded surface 150a and the lower folded surface 150b can be easily folded at desired positions.

The upper seal allowance 140a and the lower seal allowance 140b are strip-shaped surfaces provided for connecting the first portion 170a and the second portion 170b. 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, and the upper seal allowance 140a and the lower seal allowance 140b are respectively overlapped with each other. The side seal portion 140, which is the peripheral portion of the packaging container 100, is formed by sealing and adhering the facing surfaces. The shapes of the upper seal allowance 140a and the lower seal allowance 140b can be arbitrarily set as long as there is a seal allowance that overlaps with each other for forming 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, a ruled line 160 is provided between the lower seal allowance 140b and the lower trapezoidal surface 120b and the lower folded surface 150b. Is provided. The packaging container 100 formed by sealing the upper seal allowance 140a and the lower seal allowance 140b with each other has airtightness except for the opening 111.

The blanks 101a and 101b are formed by cutting a sheet material into a predetermined shape. As an example, the blanks 101a and 101b may be appropriately provided with a ruled line other than the folded ruled line 151 and the ruled line 160 along the boundary line for dividing each surface shown by the thin line in FIG.

The sheet material used for the blanks 101a and 101b is not particularly limited, but for example, a laminated film in which a thermoplastic resin layer or a sealant layer is laminated on a paper base material layer can be preferably used. As an example, the layer structure of the laminated film is polyethylene (30 μm) / paper (300 g / m ² ) / polyethylene (25 μm) / polyethylene terephthalate (12 μm) / polyethylene (50 μm) in order from the outer layer of the packaging container 100. Can be. In addition to this, a barrier layer, a functional film, or the like may be added as appropriate according to the required functions. Further, the spout 112 can be formed by using a resin material such as polyethylene.

(Transformation method)
Next, an example of a method of transforming the flat packaging container 100 into a box-shaped state will be described using the packaging container 100. FIGS. 4 (a) to 4 (d) show a diagram illustrating an example of a method of deforming the packaging container 100.

First, as shown in FIG. 4A, the first portion 170a or the second portion 170b of the packaging container 100 in a flat state is placed at the peripheral portion (specifically, the upper seal allowance 140a and the upper trapezoid). Bend the first portion 170a and the second portion 170b between the surfaces 120a and the upper folded surface 150a, or between the lower sealing allowance 140b and the lower trapezoidal surface 120b and the lower folded surface 150b). Pull apart. As a result, a gap is formed between the first portion 170a and the second portion 170b, 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 trapezoidal surface becomes. The 120a and the lower trapezoidal surface 120b serve as the side surface 120, and the upper seal allowance 140a and the lower seal allowance 140b serve as the side seal portion 140.

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

Next, as shown in FIG. 4C, the folded piece 150 is bent along the outer peripheral surface of the side surface 120. The direction in which the folded piece 150 is aligned is not limited, and as an example, as shown in FIG. 4C, two folded pieces 150 may be aligned along one side surface 120, or the folded pieces 150 are different from each other. It may be along the side surface 120.

At this time, the folded piece 150 may be attached to the surface of the side surface 120. As a method of attaching the folded piece 150 to the side surface 120, for example, there is a method of using a heat seal, a hot melt adhesive, or the like. Further, by attaching with a removable joining member such as a hook-and-loop fastener or a snap button, the packaging container 100 transformed from the box-shaped state to the flat state can be used again as the box-shaped state, so that it is flat. The packaging container 100 in such a state can be reused.

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

The box-shaped packaging container 100 can be flattened by a procedure opposite to the above procedure. Specifically, first, the folded piece 150 of the box-shaped packaging container 100 is separated from the side surface 120. Next, at the peripheral edge portion (specifically, along between the side seal portion 140 and the side surface 120), the first portion 170a and the second portion 170b are extended. Next, the gap between the first portion 170a and the second portion 170b is eliminated, and the first portion 170a and the second portion 170b are overlapped with each other to deform the packaging container 100 into a flat state. can do.

(Blank modification example)
In the above example, an example in which the packaging container 100 is formed by using the two blanks 101a and 101b corresponding to the first portion 170a and the second portion 170b is shown, as in the blank 102 shown in FIG. One blank may be used to form a packaging container. The blank 102 has a form in which a part of the upper seal allowance 140a and the lower seal allowance 140b is removed from the first portion 170a and the second portion 170b, respectively, and connected by the connection portion 180.

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

When the first portion 170a and the second portion 170b of the packaging container 100 formed by using the blank 102 are separated and deformed into a box-shaped state, the connecting portion 180 is extended. Further, when the connecting portion 180 is deformed into a flat state, the connecting portion 180 is folded back.

As described above, since the packaging container 100 can be easily deformed from a flat state to a box-shaped state, it can be returned to the box-shaped state and reused even after being crushed to the flat state once. Is. Further, since the packaging container 100 can be flattened and transformed into a box-shaped state as needed, the loading efficiency at the time of transportation is good, and the transportation and storage costs can be reduced.

[How to assemble the packaging container]
Next, the method of assembling the packaging container according to the embodiment of the present invention will be described with reference to the drawings, taking the packaging container 100 as an example.

(First Embodiment)
First, a method of assembling the packaging container according to the first embodiment using the assembling device 300 as an example will be described. FIG. 6 shows a cross-sectional view and a plan view illustrating a method of assembling the packaging container according to the first embodiment. The assembling device 300 includes a separation mechanism 310 and a plurality of pressing jigs 320. In the plan view in the following description, the suction portion 310b, which will be described later, will be omitted for convenience. Further, in the following, the direction indicated by the arrow in the cross-sectional view will be defined as the vertical direction and will be described.

The separation mechanism 310 is a mechanism for moving at least one of the upper convex polygonal surface 110a and the lower convex polygonal surface 130a of the packaging container 100 so as to be separated from each other in the thickness direction. Includes 310b.

The mounting table 310a is a table-shaped mechanism for fixing the packaging container 100 with the second portion 170b facing upward. The mounting table 310a is provided in a horizontal plane on which the packaging container 100 is placed with the first portion 170a facing each other, a hole 310c formed in the horizontal plane for inserting the spout 112, and inside the hole 310c. It includes a gripping mechanism (not shown) for gripping the spout 112 inserted for fixing the packaging container 100.

The suction portion 310b is a mechanism for moving the lower convex polygonal surface 130a away from the upper convex polygonal surface 110a in the thickness direction. The suction portion 310b includes a mechanism for fixing the lower convex polygonal surface 130a to the suction portion 310b and a mechanism for moving the lower convex polygonal surface 110a away from the upper convex polygonal surface 110a in the thickness direction. The method of fixing the lower convex polygonal surface 130a to the suction portion 310b is not limited, but in the assembling device 300, as an example, the suction cup 310d provided on the suction portion 310b is attracted to the lower convex polygonal surface 130a.

The plurality of pressing jigs 320 are jigs for abutting the peripheral edges of the first portion 170a and the second portion 170b and pressing the peripheral edges in a predetermined direction. As an example, the plurality of pressing jigs 320 are composed of four pressing jigs 320 so as to be able to surround a rectangular peripheral edge portion, but the number of the plurality of pressing jigs 320 is limited to four. Instead, it can be appropriately adjusted according to the shape of the packaging container 100 to be assembled.

As shown in FIG. 6, each pressing jig 320 includes a first surface 320a and a second surface 320b extending outward at a predetermined angle from both ends of the first surface 320a in a plan view. The first surface 320a is provided to press the peripheral edge portion, and the second surface 320b is provided to sandwich the peripheral edge portion and the folded piece 150 together with the second surface 320b of the adjacent pressing jig 320. ..

The method for assembling the packaging container according to the first embodiment is a first step (FIG. 6) in which the packaging container 100 in a flat state is prepared, and the separation mechanism 310 and the plurality of pressing jigs 320 are arranged at predetermined positions. (A)) and a second step ((b) of FIG. 6) of forming the packaging container 100 into a box shape by the separation mechanism 310 and the plurality of pressing jigs 320 are included. Hereinafter, each step will be specifically described.

(First step)
In the first step, the packaging container 100 in a flat state is prepared, the separation mechanism 310 is arranged so as to sandwich the first portion 170a and the second portion 170b from the thickness direction, and a plurality of pressing jigs 320 are provided. Are arranged so as to surround the peripheral edges of the first portion 170a and the second portion 170b. At this time, the packaging container 100 is fixed on the mounting table 310a with the first portion 170a facing the horizontal plane of the mounting table 310a and the spout 112 inserted into the hole 310c and fixed by the gripping mechanism. NS. The suction portion 310b is arranged so as to face the second portion 170b, and then the suction cup 310d sucks the lower polygonal surface 130b of the second portion 170b. Each pressing jig 320 is arranged so that the first surface 320a faces the peripheral edge portion in a plan view.

(Second step)
In the second step, the suction portion 310b is moved upward so as to be separated from the mounting table 310a, and the lower convex polygonal surface 130a is moved in the thickness direction so as to be separated from the upper convex polygonal surface 110a. At the same time, the peripheral portions are pressed by the first surfaces 320a of the plurality of pressing jigs 320 in the direction along the flat plate-shaped surface, and the upper trapezoidal surface 120a and the lower trapezoidal surface 120b are respectively formed into an upper convex polygon. It is bent with respect to the surface 110a and the lower convex polygonal surface 130a. At this time, after the plurality of pressing jigs 320 come into contact with the inner ends of the peripheral edges that come into contact with each other, the inner edges of the peripheral edges move due to the deformation of the packaging container 100, that is, the lower convex polygonal surface 130a. Accompanied by the natural movement toward the upper center with the movement in the direction away from the upper convex polygonal surface 110a, the peripheral portion moves upward so that the relative position with respect to the inner end does not change. Here, the inner end of the peripheral edge portion refers to the boundary position between the peripheral edge portion and the adjacent upper trapezoidal surface 120a and lower trapezoidal surface 120b. In the initial stage of pressing, while the pressing jig 320 gradually approaches the inner end of the peripheral edge portion, the pressing from the pressing jig 320 is received by the outer end of the peripheral edge portion, and the peripheral edge portion is on the lower trapezoidal surface 120b side at the inner end. Can be folded into. After the pressing jig 320 comes into contact with the inner end of the peripheral edge portion, the pressing force from the pressing jig 320 is received by the inner end of the peripheral edge portion and transmitted to the upper trapezoidal surface 120a and the lower trapezoidal surface 120b. After the pressing jig 320 comes into contact with the inner end of the peripheral edge portion, the relative position between the pressing jig 320 and the inner end of the peripheral edge portion does not change. As a result, the pressing jig 320 is adjacent to each other while not hindering the upward movement of the inner end of the peripheral edge portion due to the separation of the lower convex polygonal surface 130a and the upper convex polygonal surface 110a. Since the upper trapezoidal surface 120a and the lower trapezoidal surface 120b are pressed to support the box-shaped molding, it is possible to suppress molding defects such as wrinkles and distortions of the packaging container 100.

In the first embodiment, as described above, with the first portion 170a fixed, the suction portion 310b separates the lower convex polygonal surface 130a from the upper convex polygonal surface 110a in the thickness direction. Move. Therefore, as the packaging container 100 is deformed, the inner end of the peripheral edge moves upward while approaching the upper trapezoidal surface 120a and the lower trapezoidal surface 120b, as shown by the black arrows in FIG. 6B. .. Therefore, the plurality of pressing jigs 320 also move toward the upper trapezoidal surface 120a and the lower trapezoidal surface 120b as shown by the white arrows in FIG. 6B as the inner end of the peripheral edge moves. Move upwards.

As a result, a gap is formed between the first portion 170a and the second portion 170b. At the same time, when the plurality of adjacent pressing jigs 320 approach each other, any two second surfaces 320b of the plurality of adjacent pressing jigs 320 approach each other, and the upper folded surface 150a and the upper trapezoidal surface The vicinity of the connecting portion with the 120a and the vicinity of the connecting portion between the lower folded surface 150b and the lower trapezoidal surface 120b are sandwiched. As a result, the upper folded surface 150a and the lower folded surface 150b are folded along the folded ruled line 151 to form the folded piece 150.

Each pressing jig 320 moves to the edge of the upper convex polygonal surface 110a and the lower convex polygonal surface 130a, so that the packaging container 100 is moved to the upper surface 110 which is the upper convex polygonal surface 110a of the first portion 170a. A box shape including a lower surface 130 which is a lower convex polygonal surface 130a of the second portion 170b and faces the upper surface 110, and a side surface 120 formed by the upper trapezoidal surface 120a and the lower trapezoidal surface 120b. Can be done. At this time, as shown in FIG. 6B, the side seal portion 140 is bent by each pressing jig 320 so that the end edge faces the lower surface 130 and runs along the side surface 120. In FIG. 6B, the side seal portion 140 is bent along the lower trapezoidal surface 120b, but it may be bent along the upper trapezoidal surface 120a.

According to the method for manufacturing a packaging container according to the first embodiment including the above steps, the packaging container 100 can be easily deformed into a box shape by the operation of moving the plurality of pressing jigs 320, and in particular, the packaging container 100 can be easily deformed into a box shape. , It is possible to suppress the occurrence of molding defects described below.

FIG. 7 shows only a cross-sectional view of the second step of the method of assembling the packaging container according to the reference embodiment. The difference between the reference embodiment and the first embodiment is the moving direction of the plurality of pressing jigs 320 indicated by the white arrows in the figure. Specifically, in the reference embodiment, when pressing the peripheral edge portion, the plurality of pressing jigs 320 move only in the direction along the flat plate-shaped surface without accompanying the movement due to the deformation of the packaging container 100. .. Therefore, in the second step, the inner end of the peripheral edge comes into contact with the surface of the pressing jig 320 and moves upward while sliding, so that the inner edge of the peripheral edge and the plurality of pressing jigs 320 are brought into contact with each other. The relative position between them changes.

Unlike the first embodiment, in the method of assembling the packaging container according to the reference embodiment, the lower convex polygonal surface 130a moves in the direction away from the upper convex polygonal surface 110a, and the inner end of the peripheral edge portion A frictional force that impedes movement acts on the inner edge of the peripheral edge, and this effect extends to the upper trapezoidal surface 120a and the lower trapezoidal surface 120b, and thus the entire packaging container 100.

For this reason, in the method of assembling the packaging container according to the reference embodiment, as shown in FIG. 7, the assembled packaging container 100 may be partially distorted 420 or the sheet material may be wrinkled 410. There is a risk of molding defects such as

In the method for manufacturing a packaging container according to the first embodiment, by accompanying a plurality of pressing jigs 320 with the movement of the inner ends of the peripheral edges, the positions of the plurality of pressing jigs 320 relative to the inner edges of the peripheral edges are set. It is possible to suppress the change and suppress the occurrence of the above-mentioned molding defect. Therefore, according to the method for manufacturing a packaging container according to the first embodiment, the packaging container 100 can be easily put into a box-shaped state while suppressing the occurrence of molding defects by the operation of moving the plurality of pressing jigs 320. Can be transformed into.

In the second step, in order to facilitate the formation of a gap between the first portion 170a and the second portion 170b, in at least one of the first step and the second step, Gas (air) may be blown between the first portion 170a and the second portion 170b through the opening 111 of the first portion 170a. Specifically, as shown in FIG. 6, a nozzle 310e capable of blowing gas through the hole 310c of the mounting table 310a is inserted into the spout 112, and gas is blown out from the nozzle 310e. As a result, the first portion 170a and the second portion 170b can be separated from each other by the blown gas, so that even if the force with which the plurality of pressing jigs 320 press the peripheral portion is relatively small, the first portion is quickly first. It becomes possible to form a gap between the portion 170a and the second portion 170b.

In the method of assembling the packaging container according to the embodiment of the present invention, the plurality of pressing jigs 320 are moved in the peripheral edge portion due to the deformation of the packaging container 100 at the inner end of the peripheral edge portion in contact with each other. The moving direction of the separation mechanism 310 and the plurality of pressing jigs 320 is not limited to the direction disclosed in the first embodiment as long as the relative position with respect to the edge can be moved so as not to change. In the following, the method of assembling the packaging container according to another embodiment, in which the moving directions of the separation mechanism 310 and the plurality of pressing jigs 320 are different from the method of assembling the packaging container according to the first embodiment, will be described. I will explain mainly.

(Second Embodiment)
A method of assembling the packaging container according to the second embodiment using the assembling device 301 will be described. FIG. 8 shows a cross-sectional view and a plan view illustrating a method of assembling the packaging container according to the second embodiment.

The assembling device 301 includes a separation mechanism 311 and a plurality of pressing jigs 321. The difference between the second embodiment and the first embodiment is that in the second step of the second embodiment, the separation mechanism 311 makes the upper convex polygonal surface 110a a lower convex polygonal surface in the thickness direction. It is a point that the plurality of pressing jigs 321 are moved away from the 130a, and at the same time, the plurality of pressing jigs 321 move along with the movement of the inner end of the peripheral edge portion while pressing the inner end of the peripheral edge portion.

More specifically, as shown in FIG. 8, in the second step, the suction portion 310b of the separation mechanism 311 does not move, but the mounting table 310a moves downward so as to be separated from the suction portion 310b. As a result, the upper convex polygonal surface 110a moves away from the lower convex polygonal surface 130a in the thickness direction. At the same time, the first surface 320a of the plurality of pressing jigs 321 presses the inner end of the peripheral edge portion in the direction along the flat plate-shaped surface, and the upper trapezoidal surface 120a and the lower trapezoidal surface 120b are convex upward, respectively. The polygonal surface 110a and the lower convex polygonal surface 130a are bent with a ruled line as a boundary. At this time, the plurality of pressing jigs 321 move in the direction of the inner end of the peripheral edge portion in contact with each other due to the deformation of the packaging container 100, that is, in the direction away from the lower convex polygonal surface 130a of the upper convex polygonal surface 110a. Accompanied by the natural movement toward the lower center with the movement of the polygon, it moves downward so that the relative position of the peripheral edge with respect to the inner edge does not change.

In the second embodiment, with the second portion 170b fixed, the mounting table 310a moves the upper convex polygonal surface 110a away from the lower convex polygonal surface 130a in the thickness direction. Therefore, as the packaging container 100 is deformed, the inner end of the peripheral edge moves downward while approaching the upper trapezoidal surface 120a and the lower trapezoidal surface 120b, as shown by the black arrows in FIG. 8B. .. Then, as the plurality of pressing jigs 321 also move along with the movement of the inner end of the peripheral edge portion, as shown by the white arrows in FIG. 8B, while approaching the upper trapezoidal surface 120a and the lower trapezoidal surface 120b, Move down.

As a result, in the second embodiment as well as in the first embodiment, it is possible to prevent the relative position between the inner end of the peripheral edge portion and each pressing jig 321 from changing. Therefore, by moving the plurality of pressing jigs 321 it is possible to easily deform the packaging container 100 into a box-shaped state while suppressing the occurrence of molding defects.

(Third Embodiment)
Next, a method of assembling the packaging container according to the third embodiment using the assembling device 302 will be described. FIG. 9 shows a cross-sectional view and a plan view illustrating a method of assembling the packaging container according to the third embodiment.

The assembling device 302 includes a separation mechanism 312 and a plurality of pressing jigs 322. The difference between the third embodiment and the first embodiment is that in the second step of the second embodiment, the separation mechanism 312 thickens the upper convex polygonal surface 110a and the lower convex polygonal surface 130a. At the point where the plurality of pressing jigs 321 are moved away from each other in the direction, and at the same time, the plurality of pressing jigs 321 move in the direction along the flat plate-shaped surface along with the movement of the inner end of the peripheral edge while pressing the peripheral edge. be.

More specifically, as shown in FIG. 9, in the second step, the suction portion 310b of the separation mechanism 312 moves upward so as to be separated from the mounting base 310a, and the mounting base 310a is separated from the suction portion 310b. Move downward as in. As a result, the upper convex polygonal surface 110a and the lower convex polygonal surface 130a move so as to be separated from each other in the thickness direction. At the same time, the first surface 320a of the plurality of pressing jigs 322 presses the inner end of the peripheral edge portion in the direction along the flat plate-shaped surface, and the upper trapezoidal surface 120a and the lower trapezoidal surface 120b are convex upward, respectively. The polygonal surface 110a and the lower convex polygonal surface 130a are bent with a ruled line as a boundary. At this time, the plurality of pressing jigs 322 move due to the deformation of the packaging container 100 at the inner end of the peripheral edge portion in contact with each other, that is, the directions in which the upper convex polygonal surface 110a and the lower convex polygonal surface 130a are separated from each other. It moves only in the direction along the flat plate-shaped surface so that the relative position of the peripheral edge with respect to the inner edge does not change with the natural movement toward the center accompanying the movement to.

In the third embodiment, the mounting table 310a moves the upper convex polygonal surface 110a away from the lower convex polygonal surface 130a in the thickness direction, and at the same time, the suction portion 310b moves the lower convex polygonal surface 130a. It is moved in the thickness direction so as to be away from the upper convex polygonal surface 110a. Therefore, the inner end of the peripheral edge portion has a flat plate shape while approaching the upper trapezoidal surface 120a and the lower trapezoidal surface 120b as shown by the black arrow in FIG. 9B due to the deformation of the packaging container 100. Move along the surface of. Then, as the plurality of pressing jigs 322 also move along with the movement of the inner end of the peripheral edge portion, as shown by the white arrows in FIG. 9B, while approaching the upper trapezoidal surface 120a and the lower trapezoidal surface 120b, It moves along a flat plate-shaped surface.

As a result, in the third embodiment as well as in the first embodiment, it is possible to prevent the relative position between the inner end of the peripheral edge portion and each pressing jig 322 from changing. Therefore, by moving the plurality of pressing jigs 322, the packaging container 100 can be easily deformed into a box shape while suppressing the occurrence of molding defects.

(Modification example)
In the above description, the method of assembling the packaging container according to each embodiment has been described by taking the packaging container 100 as an example. However, the packaging container includes a first portion and a second portion in the shape of flat plates that overlap each other. A trapezoidal trapezoid in which the first part and the second part extend from each side of a convex polygonal surface and a convex polygonal surface, and each side is one of two parallel sides. If it is a packaging container having a surface, a plurality of folded surfaces provided between adjacent trapezoidal surfaces, and a peripheral edge portion covering the entire circumference of the outer edge, and connected to each other on the entire circumference of the peripheral edge portion, the packaging container 100 Not limited to.

As described above, according to the present invention, a packaging container in a flat state can be suitably assembled in a box-shaped state while suppressing molding defects.

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

100 Packaging container 101a, 101b Blank 110 Upper surface 110a Upper convex polygonal surface 111 Opening 120 Side surface 120a Upper trapezoidal surface 120b Lower trapezoidal surface 130 Lower surface 130a Lower convex polygonal surface 140 Side seal part 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 part 170b Second part 180 Connection part 300, 301, 302 Assembly device 310, 311, 312 Separation mechanism 310a or mounting stand 310b Suction part 310c Hole 310d Sucker 310e Nozzle 320, 321, 322 Pressing jig

Claims (5)

How to assemble a packaging container
It has a first portion and a second portion of a flat plate shape that overlap each other, and the first portion and the second portion are a convex polygonal surface of a convex polygon and each side of the convex polygonal surface, respectively. A trapezoidal surface extending from the surface and having each side as one of two parallel sides, a plurality of folded surfaces provided between the adjacent trapezoidal surfaces, and a peripheral edge extending over the entire circumference of the outer edge. A packaging container having The separation mechanism is arranged so as to sandwich the first portion and the second portion from the thickness direction, and abuts on the peripheral edge portion to press the peripheral edge portion in a predetermined direction. A step of arranging a plurality of pressing jigs so as to surround the peripheral portion, and
By the separation mechanism, the convex polygonal surfaces of the first portion and the second portion are moved so as to be separated from each other in the thickness direction.
By pressing the peripheral edge portion in the direction along the flat plate-shaped surface with the plurality of pressing jigs,
A gap is formed between the first portion and the second portion, and the folded surface is folded to form a folded piece, so that the packaging container is formed on the convex polygonal surface of the first portion. A step of forming a box including a certain upper surface, 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 trapezoidal surface is included.
In the step of forming the packaging container into a box shape, the plurality of pressing jigs are attached to the inner end of the peripheral edge portion in contact with each other as the inner end of the peripheral edge portion moves due to deformation of the packaging container. Move so that the relative position does not change,
How to assemble a packaging container. In the process of making the packaging container into a box shape,
As the plurality of pressing jigs move, any two of the plurality of pressing jigs sandwich the vicinity of the connecting portion of each of the folded surfaces with the trapezoidal surface in close proximity to each other.
The method for assembling a packaging container according to claim 1. In the process of making the packaging container into a box shape,
A gas is blown between the first portion and the second portion through an opening formed in the convex polygonal surface of the first portion.
The method for assembling a packaging container according to claim 1 or 2. In the process of making the packaging container into a box shape,
The separation mechanism attracts and moves at least one of the first portion and the second portion by a suction cup.
The method for assembling a packaging container according to any one of claims 1 to 3. The first portion further comprises a spout attached to an opening formed in the convex polygonal surface.
In the process of making the packaging container into a box shape,
The separation mechanism grips the spout and fixes the first portion.
The method for assembling a packaging container according to any one of claims 1 to 4.

Images