JP7447541B2 - Packaging container molding method and molding device - Google Patents

Description

The present invention relates to a packaging container molding method and a molding apparatus. In particular, the present invention relates to a method for molding a packaging container that can be assembled from a flat state into a three-dimensional box shape using paper as a base material, and an apparatus for the same.

Packaging containers have been used since ancient times as something necessary for human life. Particularly in modern times, various types of packaging containers have been used depending on their purpose, and packaging containers made of paper have also evolved, with their use as liquid containers expanding. It is particularly welcomed as an environmentally friendly material due to its ease of processing, low price, and easy disposal.

As an example, a packaging container is known that is formed by folding a sheet material into a hexahedral box shape, overlapping the ends, and sealing.

For example, Patent Document 1 discloses that, in a container using a paper-based sheet material, two rectangular sheets that overlap each other are sealed by sealing their peripheral edges, and each sheet is surrounded by ruled lines. Although a packaging container that can be molded into a box shape has been disclosed, there is a risk that the ruled line portion may be distorted or the container may be destroyed in the process of three-dimensional formation from a planar state.

This is because in the process of three-dimensional formation, air flows in or out from the opening, and in the process of three-dimensional formation, it is necessary to support and fix the changing shape of the container. However, they are not taken into account. Therefore, it is necessary to eliminate molding defects caused by these influences from both the molding method and the molding apparatus.

JP2019-26275A

The present invention has been made in view of this situation, and involves sealing two overlapping sheets of paper-based sheet material by sealing their peripheries, and also sealing each sheet. To provide a method for molding a packaging container and a molding device thereof, which can easily and accurately assemble a packaging container that can be molded into a three-dimensional box shape by arranging ruled lines around the sheet, and which does not cause molding defects. The task is to

As a means for solving the above problem, the invention according to claim 1 is as follows:
A method for molding a packaging container that can be molded from a flat state to a box-like state, in which a top sheet and a bottom sheet are connected to each other along the entire circumference at their respective peripheries, the method comprising:
The top side sheet is
a polygonal area provided at the center and serving as a top surface when the packaging container is in the box shape;
an opening formed in a polygonal region serving as the top surface;
a side surface on the top side of a quadrilateral whose sides are each side of the polygonal region serving as the top surface;
a top-side connecting piece formed between the mutually adjacent top-side side surfaces so as to connect the top-side side surfaces;
a top-side bifold ruled line formed on the top-side connecting piece so that the top-side connecting piece can be folded in half so that the adjacent sides of the adjacent top-side side surfaces coincide with each other;
a top-side fixing portion provided on at least a portion of the periphery and fixed to a portion of the bottom-side sheet;
including at least a polygonal region serving as the top surface and a top-side partition ruled line that partitions the top-side side surface ;
The bottom side sheet is
a polygonal area provided at the center and serving as a bottom surface when the packaging container is in the box shape;
a bottom side surface of a quadrilateral whose sides are each side of the polygonal region serving as the bottom surface;
a bottom-side connecting piece formed between the bottom-side side surfaces adjacent to each other so as to connect the bottom-side side surfaces;
a bottom-side bifold ruled line formed on the top-side connecting piece so that the bottom-side connecting piece can be folded in half so that adjacent sides of the adjacent bottom-side side surfaces coincide with each other;
a bottom-side fixing portion provided on at least a portion of the periphery and fixed to a portion of the bottom-side sheet;
including at least a polygonal region serving as the bottom surface and a bottom side partition ruled line that partitions the bottom side surface,
By stacking the top side sheet and the bottom side sheet and fixing the top side fixing part and the bottom side fixing part to each other, the flat state is sealed except for the opening. the packaging container is formed;
Regarding the packaging container in the flat state,
The top-side connecting piece is folded in half along the top-side bifold ruled line so that the two areas separated by the top-side bifold ruled line overlap each other, and the bottom side connecting piece is folded in half along the top-side bifold ruled line. A side surface including the top side side surface and the bottom side side surface is formed by folding in half along the bifold ruled line and overlapping the two areas separated by the bottom side bifold ruled line,
By attaching the top-side connecting pieces and the bottom-side connecting pieces folded in half along the side surfaces, the box-shaped state can be formed;
Folding the top side sheet along the top side bifold ruled line and the top side division ruled line to give a folding habit along the top side bifold ruled line and the top side division ruled line. and,
folding the bottom side sheet along the bottom side bifold ruled line and the bottom side division ruled line to give a folding habit along the bottom side bifold ruled line and the bottom side division ruled line;
fixing the top-side fixing part of the top-side sheet and the bottom-side fixing part of the bottom-side sheet to each other to form the packaging container in the flat state;
a step of mounting the packaging container in the flat state with the top side sheet facing the pedestal;
applying a suction mechanism to the polygonal region serving as the bottom surface;
By moving the suction mechanism in the thickness direction away from the polygonal region of the top side sheet while adsorbing the polygonal region of the bottom surface, the volume inside the packaging container is reduced. and press each of the top-side side surface and the bottom-side side surface from the outside with a plurality of jigs to form the side surface, and press the top-side connecting piece between the adjacent jigs. and a step of folding each of the bottom-side connecting pieces in half to form a gap inside the packaging container;
A method for molding a packaging container, comprising the step of attaching the top side connecting piece and the bottom side connecting piece folded in half along the side surface.

Moreover, the invention according to claim 2 is
2. The method for molding a packaging container according to claim 1, wherein in the step of forming a void inside the packaging container, gas is blown into the packaging container from the opening.

Further, the invention according to claim 3 is
Claim 1 or Claim 2, characterized in that in the step of forming a void inside the packaging container, a polygonal region of the top side sheet is fixed by suction to the base. This is a method for molding the packaging container described.

Moreover, the invention according to claim 4 is
A packaging container molding device for carrying out the packaging container molding method according to any one of claims 1 to 3,
a pedestal for mounting the packaging container in a flat state with the top sheet facing;
a suction mechanism for suctioning a polygonal region serving as a bottom surface of the packaging container;
a mechanism for moving the suction mechanism in a direction away from a polygonal region of the top side sheet that is the top surface of the packaging container;
a plurality of movable jigs that push in the top-side side surface and the bottom-side side surface of the packaging container from the outside to form side surfaces;
The plurality of movable jigs are configured to push in the top-side side surface and the bottom-side side surface from the outside, and at the same time to sandwich the top-side connecting piece and the bottom-side connecting piece together with the other adjacent movable jigs. This is a packaging container molding device characterized by being equipped with a mechanism.

Furthermore, the invention according to claim 5 is
5. The packaging container molding apparatus according to claim 4, wherein the suction mechanism includes a suction cup.

Moreover, the invention according to claim 6 is,
6. The packaging container molding apparatus according to claim 4, wherein the pedestal is provided with a mechanism for fixing the polygonal region serving as the top surface by suction.

Furthermore, the method according to claim 7 includes:
The packaging container according to any one of claims 4 to 6, wherein the base has a mechanism for blowing gas into the packaging container from an opening of the packaging container. It is a molding device.

Furthermore, the method according to claim 8 includes:
8. The packaging container molding apparatus according to claim 7, wherein the gas blowing mechanism includes a mechanism capable of discharging a part of the blown gas from the opening.

Furthermore, the method according to claim 9 includes:
The gas blowing mechanism is characterized in that, after blowing the gas into the packaging container from the opening, it is possible to maintain a state in which the internal pressure of the packaging container is higher than the external pressure for a predetermined period of time. A molding apparatus according to claim 7.

According to the present invention, two overlapping sheets of paper-based sheet material are sealed by sealing their peripheral edges, and ruled lines are placed around each sheet to create a three-dimensional shape. It is possible to provide a method for molding a packaging container and a molding apparatus therefor, which can easily and accurately assemble a packaging container that can be molded into a box shape, and which does not cause molding defects.

In particular, according to the invention described in claim 2, in the process of molding into a box shape, by blowing gas from the opening of the packaging container into the inside of the packaging container, the molding process can be accelerated. This can be a molding method that can be carried out efficiently.

In particular, according to the invention as set forth in claim 3, when forming a box shape, the top sheet is attached facing the pedestal, and in the process of forming the box shape, the polygon that becomes the top surface of the top sheet is Because the rectangular area is fixed to the base by suction, even if the polygonal area that forms the bottom of the bottom sheet is suctioned by the suction mechanism and moved upward, the packaging container that is being formed will not lift up. , it is possible to use a molding method that allows molding into the intended shape.

In particular, according to the invention described in claim 4, two sheets of paper-based sheet material that overlap each other are sealed by sealing their peripheral edges, and each sheet is provided with ruled lines. In this way, it is possible to provide a packaging container molding device that can easily and accurately assemble a packaging container that can be molded into a three-dimensional box shape, and that does not cause molding defects.

In particular, according to the invention as set forth in claim 5, the suction mechanism for suctioning the polygonal area serving as the bottom surface of the packaging container is a suction cup that can obtain a suction function simply by pressing. With a simpler and easier-to-handle mechanism, an efficient packaging container molding device can be achieved.

In particular, according to the invention set forth in claim 6, the polygonal area that becomes the top surface of the top sheet is selectively fixed to the pedestal by suction on the pedestal for mounting the top sheet facing toward the base. This mechanism is effective in preventing the top sheet from lifting or shifting during the molding process, allowing for easy and accurate packaging without affecting the formation of the sides of the body. It can be used as a container molding device.

In particular, according to the invention set forth in claim 7, the pedestal has a mechanism for blowing gas from the opening of the packaging container into the inside of the packaging container. This makes it possible to accelerate the process, resulting in a more productive and efficient packaging container molding apparatus.

In particular, according to the invention as set forth in claim 8, in addition to the mechanism for blowing gas from the opening of the packaging container into the inside of the packaging container, there is provided a mechanism that allows part of the blown gas to be discharged from the opening. This is a packaging container molding device that can suppress sudden or excessive increases in internal pressure, and can assemble packaging containers more easily and accurately without causing molding defects. It can be done.

In other words, by discharging a portion of the blown gas through the opening, it becomes possible to maintain the internal pressure for molding within an appropriate range, making it easier and more accurate to assemble the packaging container. This makes it possible to provide a packaging container molding device that does not cause molding defects.

In particular, according to the invention as set forth in claim 9, the mechanism for blowing gas from the opening of the packaging container into the inside of the packaging container until the volume of the internal space from the opening to the inside of the packaging container reaches its maximum. This mechanism allows gas to be blown into the container and maintains the internal pressure higher than the external pressure until the molding process is completed, making it possible to control the internal pressure more precisely and making it easier and more accurate to assemble packaging containers. This makes it possible to provide a packaging container molding device that does not cause molding defects.

FIG. 1 is a schematic cross-sectional view showing a state of one embodiment of a packaging container before molding, for explaining a method of molding a packaging container according to the present invention. FIG. 2 is a schematic cross-sectional view showing a state before molding of an example in which a spout is provided at the opening of a packaging container, for explaining the method of molding a packaging container according to the present invention. FIG. 3 is a schematic perspective view showing a state of one embodiment of the packaging container after molding, for explaining the method of molding the packaging container according to the present invention. FIG. 4 is a schematic plan view of a top side sheet for explaining one embodiment of the packaging container with respect to the packaging container molding method according to the present invention. FIG. 5 is a schematic plan view of the bottom side sheet for explaining one embodiment of the packaging container with respect to the packaging container molding method according to the present invention. FIG. 6 is a schematic plan view and a schematic cross-sectional view for explaining the process of imparting creases in the method of molding a packaging container according to the present invention. FIG. 7 is a schematic plan view and a schematic cross-sectional view for explaining the process of imparting creases in the method of molding a packaging container according to the present invention. FIG. 8 is a schematic plan view of the packaging container molding method and molding device thereof, as seen from above, for explaining the attachment of the packaging container to the device according to the present invention. FIG. 9 is a schematic cross-sectional view for explaining the mounting of the packaging container on the apparatus regarding the packaging container molding method and the molding apparatus according to the present invention. Moreover, it is a cross-sectional schematic diagram for demonstrating an Example and a comparative example. FIG. 10 is a schematic cross-sectional view for explaining the process of molding after the packaging container is attached to the apparatus, regarding the packaging container molding method and the molding apparatus according to the present invention. FIG. 11 is a schematic cross-sectional view for explaining the molding process regarding the packaging container molding method and molding apparatus according to the present invention. FIG. 12 is a schematic plan view from above of the molding device for explaining the molding process regarding the packaging container molding method and molding device thereof according to the present invention. FIG. 13 is a schematic perspective view for explaining the final stage of the molding process in the packaging container molding method according to the present invention.

Hereinafter, the present invention will be described in more detail with reference to FIGS. 1 to 13. However, the present invention is not limited to the examples shown here. The invention is limited by the claims.

FIG. 1 is a schematic cross-sectional view showing a state of one embodiment of a packaging container before molding, for explaining a method of molding a packaging container according to the present invention.

The problem of the present invention is to seal two overlapping sheets of paper-based sheet material by sealing their peripheral edges, and to create ruled lines around each sheet. To provide a method for molding a packaging container and a molding apparatus therefor, which can easily and accurately assemble a packaging container that can be molded into a three-dimensional box shape, without causing molding defects. In FIG. 1, the molding method will be described, particularly the state before molding.

In the method for molding a packaging container (100) according to the present invention, in a state before molding, the packaging container (100) has a top sheet (10) and a bottom sheet (20) stacked on top of each other, and a fixing portion ( 1), they are fixed to each other over the entire circumference, or a part thereof is continuous, and has a flat shape (flat state) as shown in FIG.

However, although it is possible for the top sheet (10) and the bottom sheet (20) to overlap in close contact with each other, in FIG. This indicates the state in which the

The top side sheet (10) has a polygonal area (11) at its center that becomes the top surface of the packaging container (100), surrounded by mountain-fold ruled lines (2), and this top surface An opening (13) is provided inside the region (11).

The bottom sheet (20) also has a polygonal area (21) in its center, which will become the bottom surface of the packaging container (100) after molding. This polygonal area (21) is also surrounded by mountain-fold ruled lines (3).

Although the top-side side surface (15) is shown almost horizontally in FIG. 1, after the packaging container (100) is molded, the top-side side surface (15) of the packaging container (100) is shown vertically. This is the part that stands up.

FIG. 2 is a schematic cross-sectional view showing a state before molding of an example in which a spout is provided at the opening of a packaging container, for explaining the method of molding a packaging container according to the present invention.

A spout (14) can be provided in the opening (13) inside the area (11) serving as the top surface. When the spout (14) is provided, it is highly convenient for pouring out the contents in applications such as liquid containers, and it is also possible to attach a cap for sealing.

The spout (14) can be made of a plastic material, for example, as a separate member. Although the type of plastic is not limited, for example, polyolefin resin can be used, and in particular, polyethylene resin can be used.

In addition, the spout (14) and the opening (13) of the packaging container (100) may be attached using a method such as welding, for example by providing a sealant layer on the top sheet (10) side. Can be done.

FIG. 3 is a schematic perspective view showing a state of one embodiment of the packaging container after molding, for explaining the method of molding the packaging container according to the present invention.

The present invention relates to a method of molding a packaging container (100) from a flat packaging container (100) shown in FIG. 1 to a three-dimensional box-shaped packaging container (100) shown in FIG. 3, and also relates to a molding apparatus for the same. be. FIG. 3 shows the packaging container (100) in a three-dimensional box shape after being molded.

In the molded three-dimensional box-shaped packaging container (100), the top surface (30) is formed by the polygonal region (11) that becomes the top surface (30), and in the example shown in FIG. The shape of the surface (30) is a quadrilateral. This rectangle is surrounded by a mountain-fold ruled line (2), and forms a ridgeline between the top surface (30) and the top-side side surface (15) after the packaging container (100) is formed. .

Further, the top surface (30) has an opening (13), and in the example shown in FIG. 3, the opening (13) is provided with a spout (14).

The body (40) extends from the top side sheet (10) to the top side surface (15) and from the bottom side sheet (20) to the bottom side surface (25), and both connect to the fixing part (1) at the center. ) are connected and formed by.

FIG. 4 is a schematic plan view of a top side sheet for explaining one embodiment of the packaging container with respect to the packaging container molding method according to the present invention.

In the packaging container (100) according to the present invention, the top side sheet (10) has a polygonal area (11) at its center that becomes the top surface (30) of the packaging container (100), which is indicated by a broken line in the figure. It is surrounded by mountain-fold ruled lines (2), and in the example shown in FIG. 4, the polygonal area (11) is a quadrangle in the center.

That is, this portion becomes the top surface (30) after the packaging container (100) is molded, and has an opening (13) inside this polygonal region (11). The packaging container (100) according to the invention is sealed except for this opening (13).

A quadrangular top-side side surface (15), each side of which is one side of this polygonal region (11), is provided in the same number as the number of sides of the polygonal region (11), and as shown in FIG. In the example shown, since the polygonal region (11) is a quadrilateral, the number of top side surfaces (15) is four.

Furthermore, a top-side connecting piece (16) is provided at each corner between adjacent top-side side surfaces (15) to connect and close the top-side side surfaces (15). In the example shown in FIG. 4, the top side connecting piece (16) is shown as a grained rectangular area with circles at the four corners.

In this top side connecting piece (16), the top side connecting piece (16) can be folded in half so that the sides forming the top side side surfaces (15) of adjacent quadrangles coincide with each other. A bi-fold ruled line (17) is provided on the mountain fold, and the top-side bifold ruled line (17) divides the top-side connecting piece (16) into two regions (A) and (B). .

In FIG. 4, the area (A) and area (B) are shown only in the top-side connecting piece (16) at the top right, but the area divided by the top-side bi-fold ruled line (17) is , the same is true for the four corners.

Other than the side where the top side sheet (10) and the bottom side sheet (20) are directly continuous, the bottom side sheet (20) is placed on the outside of the top side side surface (15) and the top side connecting piece (16). ) is provided with a top-side fixing portion (18) that is fixed at the peripheral edge, and in the example shown in FIG. 4, this is the area shown by diagonal lines surrounding the entire outside.

FIG. 5 is a schematic plan view of the bottom side sheet for explaining one embodiment of the packaging container with respect to the packaging container molding method according to the present invention.

In the packaging container (100) according to the present invention, the bottom side sheet (20) has a polygonal area (21) that becomes the bottom surface of the packaging container (100) in the center thereof, and a mountain-fold ruled line ( 3), and in the example shown in FIG. 5, the polygonal region (21) is a quadrangle in the center.

Each side of this polygonal area (21) is one side, and the same number of quadrangular bottom side surfaces (25) as the number of sides of the polygonal area (21) are provided, as shown in FIG. In the example, the number of bottom side surfaces (25) is four, the same as in the case of the top side surfaces (15).

In addition, a bottom-side connecting piece (26) is provided at each corner between the adjacent bottom-side side surfaces (25) to connect and close the bottom-side side surfaces (25), as shown in FIG. In the example shown in , the bottom side connecting piece (26) is shown as a grained rectangular area with circles at the four corners, as in the case of the top side connecting piece (16).

In this bottom side connecting piece (26), there is a bottom side bi-fold ruled line ( 27) is provided in a mountain fold, and the bottom side connecting piece (26) is divided into two regions (C) and (D) by this bottom side bifold ruled line (27).

In the example shown in FIG. 5 as well, the region (C) and region (D) are shown only in the bottom-side connecting piece (26) at the upper right, but the region is divided by the bottom-side bifold ruled line (27). The same applies to all four corners.

Except for the sides where the bottom sheet (20) and the top sheet (10) are directly continuous, the top sheet (10) is placed on the outside of the bottom side surface (25) and the bottom connecting piece (26). A bottom side fixing part (28) is provided which is fixed at the peripheral edge thereof, and in the example shown in FIG. 5, this is the area shown by diagonal lines surrounding the entire outside.

Note that the designation of the mountain fold of the ruled line in both the bottom sheet (20) and the top sheet (10) is an example, and the ruled line weakens the stiffness of the sheet material to form the packaging container (100). Valley folding may be used as long as the sheet material can be easily folded along ruled lines during molding. Furthermore, in addition to the above-mentioned ruled lines, ruled lines may be appropriately provided on each constituent surface of each sheet and on the boundary line of the connecting pieces to facilitate folding. However, the top-side fixing part (18) of the top-side sheet (10) is the boundary line between the top-side side surface (15) and the top-side connecting piece (16). ) does not need to be provided with a ruled line since the inner edge of the container (100) is not bent along the inner edge when the packaging container (100) is transformed into a box shape.

Next, a method of preparing a top sheet (10) and a bottom sheet (20) and molding a box-shaped packaging container (100) will be described.

In the method for molding a packaging container (100) according to an embodiment of the present invention, first, a top side sheet (10) and a bottom side sheet (20) are prepared, and each sheet material has a folding pattern that weakens its stiffness. Make a temporary fold to add . Specifically, the bottom-side fixing portion (28), which is the boundary line between the bottom-side fixing portion (28) of the bottom-side sheet (20), the bottom-side side surface (25), and the bottom-side connecting piece (26), Gives a crease to the inner edge. In addition, the top side sheet (10) and the bottom side sheet (20) are aligned along the boundary line of each constituent surface or connecting piece, the top side bifold ruled line (17) or the bottom side bifold ruled line (27), respectively. Fold it to give it a crease.

One example of a method for imparting the folding pattern is to press the top side sheet (10) and the bottom side sheet (20) using male and female dies formed to match the folding pattern to be applied. Can be used.

FIG. 6 describes a method of imparting a crease to the inner edge of the bottom-side fixing portion (28) of the bottom-side sheet (20) using a male mold (70) and a female mold (71). FIG. 6(a) shows a schematic plan view of the female mold (71), and FIG. 6(b) shows a bottom sheet (20) sandwiched between the female mold (71) and the male mold (70). 6 is a schematic cross-sectional view taken along the line AA' shown in FIG. 6(a) in the open state.

The female mold (71) shown in FIG. 6 includes a recess (71a) corresponding to the inner edge of the bottom side fixing part (288). The male mold (70) is formed in a shape that can be inserted into the recess (71a). When performing temporary folding using the male die (70) and the female die (71), after placing the bottom side sheet (20) on the female die (71), as shown in FIG. 6(b), Using the mold (70), press the polygonal region (21) that will become the bottom surface, the bottom side surface (25), and the bottom side connecting piece (26) toward the recess (71a). As a result, a crease is imparted to the inner edge of the bottom-side fixing portion (28) of the bottom-side sheet (20). In addition, the four corners of the recess (71a) are provided with areas at the same height as the recess (71a) so as to expand outward, thereby suppressing deformation of the four corners of the pressed bottom sheet (20) and eliminating unnecessary This prevents any folding tendency from being imparted.

FIG. 7 shows the bottom side bifold ruled line (27) of the bottom side sheet (20), the polygonal area (21) that will become the bottom surface, and the bottom side using the male mold (72) and the female mold (73). A method for imparting creases to the side surface (25) and the boundary line of the bottom side connecting piece (26) will be explained. FIG. 7(a) shows a schematic plan view of the female mold (71), and FIG. 7(b) shows a bottom sheet (20) sandwiched between the female mold (73) and the male mold (71). 7 is a schematic cross-sectional view taken along line BB' shown in FIG. 7(a) in the open state.

The female mold (73) shown in FIG. 7 has a recess (73a) having a shape corresponding to the polygonal region (21) serving as the bottom, and slits (73b) extending outward from the four corners of the recess (73a). ). The male mold (73) is formed in a shape that can be inserted into the recess (73a). When temporarily folding with the male die (72) and the female die (73), the bottom side sheet (20) which has been temporarily folded with the male die (70) and the female die (71) is ), as shown in FIG. 7(b), use the male mold (72) to move the polygonal area (21) that will become the bottom surface and the bottom side surface (25) toward the recess (73a). and press. At this time, the top-side connecting piece (16) is bent at the bottom bi-fold ruled line (27) and inserted into the slit (73b). As a result, the bottom side bi-fold ruled line (27) of the bottom side sheet (20) and the boundary line between the polygonal area (21) serving as the bottom surface, the bottom side surface (25), and the bottom side connecting piece (26). A crease is imparted. In addition, from the process of imparting a crease to the inner edge of the bottom side fixing part (28) shown in FIG. 6, the bottom side bi-fold ruled line (27) and the polygonal area (21 ), the step of imparting creases to the bottom side surface (25) and the boundary line of the bottom side connecting piece (26) may be performed first.

Although not shown, the top side sheet (10) is also formed using the same method as the bottom side sheet (20) shown in FIG. A step of imparting creases to the region (11), the top-side side surface (15), and the boundary line of the top-side connecting piece (16) is performed. Note that the inner edge of the top-side fixing part (18) needs to be given a crease, since the inner edge does not bend along the inner edge when the packaging container (100) is transformed into a box shape. Therefore, for the top side sheet (10), there is no need to perform the step of imparting a crease to the inner edge of the top side fixing portion (18).

In this way, by giving the top side sheet (10) and the bottom side sheet (20) a bend, it is easy to bend the sheet material when transforming the packaging container (100) into a box shape. Since the packaging container (100) can be easily folded, distortions and wrinkles can be prevented from occurring during the process of molding the flat packaging container (100) into a box shape.

Next, the top-side fixing part (18) of the top-side sheet (10) which has been given a folding pattern and the bottom-side fixing part (28) of the bottom-side sheet (20) are fixed to each other, and as shown in FIGS. A flat-shaped packaging container (100) as shown in FIG.

Thereafter, the flat packaging container (100) is molded into a box shape using a molding device (50) which will be described below. FIG. 8 is a schematic plan view of the packaging container molding method and molding device thereof, as viewed from above, for explaining how to attach the packaging container to the device according to the present invention.

As described above, in the present invention, the top side sheet (10) and the bottom side sheet (20) are overlapped to fix the top side fixing part (18) and the bottom side fixing part (28) to each other. After manufacturing a flat packaging container (100) that is sealed except for the opening (13) on the top surface, the packaging container (100) is mounted on a molding device (50) to form the packaging container (100). It is an object of the present invention to provide a method for molding a packaging container (100) and a molding device (50) for molding the packaging container into a box shape.

The molding device (50) is an example of a molding device (50) for carrying out a method of molding a three-dimensional box-shaped packaging container (100), and includes a top sheet (10) and a bottom sheet (20). ) is provided with a pedestal (51) for installing a flat-shaped packaging container (100) with the top side sheet (10) facing.

Further, the molding device (50) is equipped with a plurality of jigs (52) on the pedestal (51), and these jigs (52) are used to hold the fixing portion (1) during the molding process of the packaging container (100). This is a movable jig (52) that forms the side surfaces of the box-shaped packaging container (100) by pushing the top side surface (15) and the bottom side surface (25) from the outside through. In the example shown in FIG. 8, since there are four side surfaces to be formed, this is an example including four jigs (52).

The movable jigs (52) are each movable in the direction of the arrow (57) in FIG. 8, and are movable in the direction of the arrow (57) in FIG. The packaging container (100) is molded by sandwiching the container from the outside and supporting it by pressing it.

The four jigs (52) push in the top-side side surface (15) and the bottom-side side surface (25) from the outside, and at the same time, together with the other adjacent movable jigs, push the top-side joint piece and the bottom-side joint piece. Tuck the pieces in. As a result, as the molding progresses, the sides of the packaging container (100) rise, and as the packaging container (100) becomes three-dimensional, pressure is applied from the periphery to sandwich the packaging container (100), so that the top side It is effective for folding the ruled lines provided on the sheet (10) and the bottom sheet (20) for molding, and for forming and assembling the entire body (40) and packaging container (100).

The side surface of the body (40) at this time is the side surface of the packaging container (100), in which the top side surface (15) and the bottom side surface (25) are continuous with each other at their respective fixing parts.

Further, although not shown in FIG. 8, a suction mechanism is provided for suctioning the polygonal region (21) that forms the bottom surface of the packaging container (100) during the molding process. Although this suction mechanism is not shown in FIG. 8, it is arranged on the near side of this plan view. This will also be described later using FIGS. 9 to 11.

FIG. 9 is a schematic cross-sectional view for explaining the attachment of the packaging container to the apparatus regarding the packaging container molding method and the molding apparatus according to the present invention.

That is, FIG. 9 is a schematic cross-sectional view showing the state of the molding device (50) shown in FIG. 8 and the packaging container (100) attached to the molding device (50). In this figure, the suction mechanism (53) is shown.

As mentioned above, the packaging container (100) is constructed by stacking the top sheet (10) and the bottom sheet (20) and fixing the top sheet (10) at the fixing part (1). It is mounted facing the pedestal (51). That is, in the example shown in FIG. 9, the packaging container (100) is mounted and molded upside down.

The packaging container (100) in a flat state is attached to the pedestal (51) of the molding device (50), and there are no particular restrictions on the means and method for attaching it, but It can be selected arbitrarily as long as it does not cause any problems. Therefore, it may be mechanically attached and fixed, or it may be fixed to the pedestal (51) using means such as suction.

The suction mechanism for the pedestal (51) includes a suction cup, a vacuum suction mechanism, an adhesive suction mechanism, etc., and can be selected as appropriate. For example, in the example shown in FIG. As an adsorption mechanism provided in 51), a porous material (63) is arranged, and a vacuum adsorption mechanism is further provided to exhaust air in the direction of the arrow (64), so that the packaging container (100) is brought into close contact with the base (51). An example of fixing is shown below.

This fixing is to selectively fix the polygonal area (11) that becomes the top surface (30) of the top sheet (10) of the packaging container (100) in close contact with the base (51). , the trunk (40), and the bottom (31).

That is, by providing the suction mechanism (63) that fixes the polygonal region (11) on the top side to the pedestal, the packaging container (100) can be fixed to the pedestal without affecting the molding. , it is more effective to realize a method for molding a packaging container (100) and a molding device thereof, which allows molding and assembly of the packaging container (100) to be performed more easily and accurately, and does not cause molding defects. .

Further, as shown in the example shown in FIG. 8, in the molding apparatus (50) of the present invention, the pedestal (51) is provided in a polygonal area (11) that becomes the top surface (30) of the packaging container (100). A mechanism can be provided that can blow gas into the inner part of the packaging container (100) from the opening (13).

When blowing gas, the blown gas acts like a balloon expanding from inside the packaging container (100), which is effective in molding the packaging container (100) more smoothly.

Regarding this mechanism, as shown in the example shown in FIG. ) may be provided with a hole (55), and the mechanism may be such that gas can be blown through the hole (55) using, for example, a nozzle (56).

Furthermore, the molding device (50) according to the present invention includes a jig (52) for forming the side surfaces of the packaging container (100) by pressing from the outside of each side surface. It is also provided with a suction mechanism (53) that suctions and suctions the polygonal region (21) that forms the bottom surface (31) of the packaging container (100) from the outside of the bottom sheet (20).

This suction mechanism (53), in the process of molding the packaging container (100) into a three-dimensional shape, suctions the polygonal area (21) that will become the bottom surface (31) while moving in the direction of the arrow (58), that is, toward the top side. To make it easier to increase the volume inside the packaging container (100) by moving the sheet (10) in the thickness direction away from the polygonal region (11) that becomes the top surface (30) of the packaging container. effective.

The adsorption mechanism (53) includes, for example, a vacuum adsorption mechanism, an adhesive adsorption mechanism, an electrostatic adsorption mechanism, an adsorption mechanism using a magnetic adsorption mechanism, etc., and can be selected as appropriate.Among these, the magnetic adsorption mechanism is particularly suitable. However, it is difficult to apply this method only when a magnetic material is interposed in the material of the packaging container (100), or in the case of an electrostatic adsorption mechanism, the device becomes complicated and the handling is complicated, which is not preferable.

As an example of the suction mechanism (53), the suction mechanism (53) for the polygonal region (21) serving as the bottom surface (31) may use one or more suction cups (54), for example. .

The advantage of using the suction cup (54) is that it has a simpler structure because it can obtain suction and fixing functions by simply pressing it against the surface of the polygonal area (21) that becomes the bottom surface (31) of the bottom side sheet (20). It is a convenient mechanism and is more preferable.

Further, in the present invention, this suction mechanism is movable in the direction of the arrow (58). The movable suction mechanism (53) moves from bottom to top, and as the molding progresses, the sides of the packaging container (100) rise and the packaging container (100) becomes three-dimensional. 53) gradually becomes higher, and therefore the position of the bottom surface (31) also rises. At the same time, the molding of the packaging container (100) progresses in conjunction with the movement of the packaging container (100) being pinched from the periphery by the jig (52).

By the movement of these jigs (52) and the suction mechanism (53), the creases for molding provided on the top side sheet (10) and the bottom side sheet (20) are bent, and the body (40) and This is effective for forming the entire packaging container (100).

Note that the state of the molding apparatus shown in FIG. 9 shows a state in which the above-mentioned gas blowing nozzle (56) is not attached to the molding apparatus (50). An example of mounting the nozzle (56) will be described later using FIG. 10.

FIG. 10 is a schematic cross-sectional view for explaining the process of molding after the packaging container is attached to the device, regarding the packaging container molding method and the molding device according to the present invention.

In the present invention, the pedestal (51) can be provided with a mechanism for blowing gas into the packaging container (100) from the opening (13) of the packaging container (100).

In the example shown in FIG. 10, a nozzle (56) for blowing gas is installed in a hole (55) in a pedestal (51). Further, in this example, a spout (14) is attached to the opening (13) of the packaging container (100). This allows gas to be blown into the packaging container (100) during the molding process.

When blowing gas, it is possible for all the gas emitted from the nozzle to remain inside the packaging container and increase the volume inside the packaging container (100), but in the example shown in FIG. 10, the gas to be blown is As shown by the arrow (60), it is supplied to the nozzle (56) and blown from the nozzle (56) into the inside of the packaging container (100) to form a gap (32), and a part of it is connected to the aforementioned nozzle (56) and the pedestal. It is discharged from the gap (51) to the outside of the molding device (50) by a flow in the direction of arrow (62).

This mechanism prevents the pressure inside the packaging container (100) from rising too rapidly or excessively because the discharged gas acts as a buffer, and maintains an appropriate internal pressure during the molding process. 100) can be easily and accurately molded without causing problems such as rupture, distortion, and wrinkles.

In other words, if a mechanism is provided in which a part of the gas to be blown is discharged outside from the opening (13) of the packaging container (100), there is a method for molding the packaging container (100) that is less likely to cause molding defects. , and a molding device (50) thereof. This can be achieved, for example, by providing a gap between the nozzle (56) and the pedestal (51).

In the example shown in FIG. 10, a plurality of suction cups (54), which are suction mechanisms (53), are arranged in the polygonal area (21) of the bottom sheet (20), which is the bottom surface (31) of the packaging container (100). The polygonal region (21) can act to lift the polygonal region (21) upward while moving in the direction of the arrow (58).

At the same time, the movable jigs (52) each move in the direction of the arrow (57) so as to sandwich the packaging container (100), pushing in the top side surface (15) and the bottom side surface (25), and pushing the packaging container (100) into the packaging container (100). 100) The sides of the body can be molded.

That is, in the example shown in FIG. 10, the bottom surface (31) is moved upward by the suction cup (54), the side surface of the body is formed by the jig (52), and in addition, gas is blown from the opening (13). This figure shows the molding process in which molding is performed.

FIG. 11 is a schematic cross-sectional view for explaining the molding process regarding the packaging container molding method and molding apparatus according to the present invention.

The present invention manufactures a flat packaging container (100) that is sealed except for the opening (13) on the top surface, and the top side connecting piece (100) at each corner of the top side sheet (10) ( 16) in half along the top side bi-fold ruled line (17), and overlap the two areas separated by the top side bi-fold ruled line (17) that constitute this top side connecting piece (16). At the same time, the bottom-side connecting piece (26) at each corner of the bottom-side sheet (20) is folded in half along the bottom-side bifold ruled line (27), and the bottom side forming the bottom-side connecting piece (26) is folded in half. The two areas separated by the side bifold ruled line (27) are overlapped with each other to form a side surface of the packaging container (100) that is continuous from the top side to the bottom side, and the top side connecting piece ( 16) and the bottom side connecting piece (26) constitute a fin-shaped panel (34) that protrudes outward from each corner of the packaging container (100), and the packaging container (100) has a three-dimensional box shape. and a molding apparatus (50).

In the example shown in FIG. 11, molding is performed by the above molding method, and the molding device (50) has a pedestal (51), and a nozzle (56) is mounted on the pedestal (51). A hole (55) is provided, and gas is blown from the nozzle (56) toward the opening (13) of the packaging container (100) via the spout (14) provided in the packaging container (100). This is an example.

As explained in FIG. 10, the gas is supplied to the nozzle (56) as shown by the arrow (60), and from the nozzle (56) into the packaging container (100) in the direction of the arrow (61). The flow forms a gap (32) shown in FIG. 10, and as the packaging container (100) is molded into a three-dimensional shape, an internal space (33) of the container is formed, and a part of the gas flows through the aforementioned nozzle ( 56) and the pedestal (51), the molding device (50) is discharged by the flow in the direction of the arrow (62).

On the other hand, the movable jigs (52) are each movable in the direction of the arrow (57) in the figure, and in the process of molding the packaging container (100), they pinch the sides of the packaging container (100) from the outside. The body of the packaging container (100) and the entire packaging container are molded by being supported by pressing (pushing).

The movement of the jig (52) is such that as the molding progresses, the sides of the packaging container (100) rise, and as the packaging container (100) becomes three-dimensional, the jig (52) is pressed so as to sandwich the packaging container (100) from the periphery. Therefore, it is effective for bending the ruled lines provided on the top sheet (10) and the bottom sheet (20) for molding, and for forming the entire body and packaging container (100).

The suction cup (54), which is the suction mechanism (53), moves in the direction of the arrow (58), that is, as the side surface of the packaging container (100) rises as molding progresses and the packaging container (100) becomes three-dimensional. 11, the movement is from downward to upward.

Therefore, the polygonal region (21) of the bottom sheet (20), which becomes the bottom surface (31) of the packaging container (100), which is sucked by the suction mechanism (53), also moves upward.

A pressing force is applied to the body of the packaging container (100) by the jig (52) as described above, by pinching it from the periphery, and a suction cup (54), which is a suction mechanism (53), is attached to the bottom surface (31). ), by applying an upward pulling force, the creases for forming are bent not only on the bottom surface (31) but also on the top sheet (10) and the bottom sheet (20). , is also effective in forming the entire body (40) and packaging container (100).

In addition, by appropriately blowing gas, a more stable molding method can be achieved.

FIG. 12 is a schematic plan view from above of the molding device for explaining the molding process regarding the packaging container molding method and molding device thereof according to the present invention.

In the molding device (50) according to the present invention, there is a space between adjacent jigs (52) and jigs (52) for forming individual side surfaces. A mechanism is provided for sandwiching and overlapping the protruding fin-like panels (34).

In the example shown in FIG. 12, each movable jig (52) moves in the direction of the arrow (57) in the figure as the molding is performed, and the jig forms the side surface of the packaging container (100) by pressing. (52) becomes a mechanism for sandwiching and forming the fin-shaped panel (34) protruding outward from each corner of the side surface as the jigs (52) approach each other. It can be seen that it is formed. After molding, the fin-like panel (34) is attached along the side surface of the packaging container (100), thereby completing the three-dimensional box-shaped packaging container (100).

In addition, when blowing gas in the molding process, there is a method in which all the gas to be blown remains inside the packaging container (100) and the packaging container (100) is molded into a box shape, as well as an example shown in FIG. 11. Alternatively, the volume of the internal space (33) of the part that is inside the packaging container (100) from the opening (13) is maximized. It is also possible to use a mechanism that allows gas to be blown until the molding is completed, and then maintains the internal pressure higher than the external pressure until the molding is completed.

When using such a mechanism for blowing gas, it is possible to create a molding device (50) that can more finely adjust the internal pressure of the packaging container (100) and perform molding under optimal conditions. be.

It also has a movable jig (52) that supports the side surfaces of the packaging container (100) in the direction of the arrow (57) by pressing from the outside of each side surface so as to sandwich the side surfaces. The device also has a suction mechanism (53) that pulls and forms the bottom surface (31) of the bottom sheet (20) toward the front in FIG. 12, and is capable of forming a packaging container (100). be.

FIG. 13 is a schematic perspective view for explaining the final stage of the molding process in the packaging container molding method and molding apparatus according to the present invention.

In this way, the packaging container (100) molded three-dimensionally by the molding method according to the present invention has fin-shaped panels (34 ), and further, the fin-shaped panel (34) is placed along the body side of the packaging container (100) in the direction shown by the arrow in FIG. By attaching it to the side surface of the container, a three-dimensional box-shaped packaging container (100) is completed. Note that the direction in which the fin-shaped panel (34) is aligned along the side surface of the body of the packaging container (100) is not limited. In the example shown in FIG. 3, as shown in FIG. 13, the two fin-like panels (34) are placed along the side of the body in a direction in which the tips approach each other, so that the tips of the fin-like panels (34) are aligned with each other. 13, but instead one of the two fin-like panels (34) is placed along the side of the body opposite to that shown in FIG. 13 so that the fin-like panels (34) do not overlap each other. It's okay.

That is, the method for molding a packaging container (100) according to the present invention involves stacking a top sheet (10) and a bottom sheet (20) and fixing them to each other along the entire circumference, or continuously forming a part of them. This is a method for molding a packaging container (100) from a flat shape to a three-dimensional box shape.

In this case, a flat packaging container (100) is manufactured by sealing except for the opening (13) on the top surface, and the top-side connecting pieces (16) at each corner are folded in half on the top side. Fold in half along the ruled line (17), overlap the two areas that make up this top side joining piece, and fold the bottom side joining piece (26) at each corner along the bottom side folding line (27). The two areas constituting the bottom side connecting piece (26) are overlapped with each other by folding in half to form a side surface of the packaging container (100) that is continuous from the top side to the bottom side. Both the bottom side connecting piece (16) and the bottom side connecting piece (26) constitute a fin-like panel (34) that protrudes outward from each corner of the packaging container (100), and forms a three-dimensional box shape. This is a method of molding.

Further, in the present invention, the side surfaces of the packaging container (100) are formed by pressing from the outside of each side surface with the jig (52), and the bottom surface (31) of the packaging container (100) is formed by pressing the bottom side sheet (20) ) from the outside by being pulled by the suction mechanism (53).

In addition, the molding method according to the present invention simultaneously presses each side surface from the outside with the jig (52), and simultaneously presses the side surface between the adjacent jigs (52) and jigs (52) from each corner of the side surface to the outside. The fin-shaped panel (34) is formed by sandwiching a fin-shaped panel (34) that protrudes toward the packaging container (100), and the fin-shaped panel (34) is attached to the side surface of the body along the side surface of the packaging container (100). The process is characterized in that the molding of the three-dimensional box-shaped packaging container (100) is completed.

Furthermore, in order to realize the above-described molding method, the molding device (50) according to the present invention includes a pedestal on which a flat packaging container is mounted, and the side surfaces of the packaging container are pressed from the outside of each side surface. , a movable jig (52) that supports and forms the side surface, and a suction mechanism (53) capable of forming the bottom surface of the packaging container. One of the features is that it has a mechanism that increases the height of (100) and moves in a direction away from the pedestal (50) to pull the bottom surface.

As described above, according to the present invention, two sheets of paper-based sheet material that overlap each other are hermetically sealed by sealing their peripheral edges, and ruled lines are placed around each sheet. A method for molding a packaging container (100) and a molding device (50) for the packaging container (100) that can be easily and accurately assembled into a three-dimensional box shape without causing molding defects. ) can be provided.

The present invention will be explained in more detail below using Examples and Comparative Examples. However, the present invention is not limited to the examples shown here. The invention is limited by the claims.

A flat-shaped packaging container is produced by stacking the top sheet and the bottom sheet and sealing them except for the opening on the top surface, molding using a molding device, and evaluating whether there are any abnormalities in the molding. did.

The material composition of the top side sheet and the bottom side sheet is as follows.
From the outside of the packaging container,
Polyethylene (thickness 30μm) / Paper (300g/m ² ) / Polyethylene (thickness 25μm) / Polyethylene terephthalate film (thickness 12μm) / Polyethylene (thickness 50μm)
It is.

A spout is attached to the opening of the top side seat.
The spout is made of polyethylene resin and is attached to the opening of the top sheet of the packaging container by welding.

<Example 1>
The top side sheet has a rectangular area in the center that will serve as the top surface of the packaging container, surrounded by mountain-fold ruled lines, and has an opening inside the rectangular area that will serve as the top surface. There are four side surfaces on the top side of the rectangle, each side of which is one side, and a top side connecting piece is provided at each corner between each adjacent side surface on the top side. A top-side fixing portion for fixing to the bottom-side sheet is provided on the outside of the top-side side surface and the top-side connecting piece.

The bottom sheet has a rectangular area in the center that will serve as the bottom of the packaging container, surrounded by mountain-fold ruled lines, and the bottom side of the rectangle, with each side of this rectangle as one side, has four sides. A bottom-side connecting piece is provided at each corner between each adjacent bottom-side side surface, and is fixed to the top-side sheet on the outside of the bottom side side surface and the bottom-side connecting piece. A bottom side fixing part is provided.

The top side sheet was given a folding habit along the top side bifold ruled line and the top side division ruled line, and the bottom side sheet was given a folding habit along the bottom side bifold ruled line and the bottom side division ruled line. Thereafter, the top side sheet and the bottom side sheet are stacked, the top side fixing part and the bottom side fixing part are fixed to each other, and the top side opening is sealed to form a flat packaging container. was manufactured.

The molding apparatus shown in FIG. 9 was used as the molding apparatus for the above-mentioned flat packaging container. However, the nozzle has not been installed.

The suction mechanism (53) was movable and used a suction cup. The internal space of the packaging container is increased by molding, and as the bottom surface rises, a mechanism is created in which the bottom surface is stretched while rising.

<Comparative example 1>
The flat-shaped packaging container before molding is the same as Example 1 except that the top sheet and the bottom sheet are not creased.

A molding device shown in FIG. 9 was used as a molding device for a flat packaging container.
However, when installing the nozzle, no gap is provided between the pedestal and the nozzle.
Further, regarding the nozzle, the first embodiment does not include a nozzle, and is different in this part.

Further, the adsorption mechanism (53) is not used. This part is different from the first embodiment.

The evaluation results of Example 1 are as follows.
The box shape after molding could be molded into the intended shape, and no rupture, distortion, or wrinkles were observed.

In other words, this means that the packaging container molding method and molding apparatus of the present invention can be used to form two overlapping sheets of paper-based sheet material, which is the object of the present invention. A packaging container (100) that can be molded into a three-dimensional box shape can be easily and accurately assembled by sealing the peripheral edges of the sheets and passing ruled lines around each sheet. This proves that it is possible to provide a method for molding a packaging container (100) and a device for molding the same without causing molding defects.

The evaluation results of Comparative Example 1 are as follows.
Some of the box shapes after molding were ruptured, distorted, and wrinkled, making it impossible to obtain the intended shape.

This is because Comparative Example 1 does not have an adsorption mechanism for the bottom sheet, but instead blows gas through the opening, which causes the internal pressure in the internal space of the packaging container to rise rapidly or excessively. It is thought that this caused the sheet material to burst, or that the sheet material was not bent at the desired position and was distorted or wrinkled because the sheet material was not bent.

As described above, according to the present invention, two sheets of paper-based sheet material that overlap each other are hermetically sealed by sealing their peripheral edges, and ruled lines are placed around each sheet. To provide a method for molding a packaging container (100) and a molding device thereof, which can easily and accurately assemble a packaging container (100) that can be molded into a three-dimensional box shape, and which does not cause molding defects. We were able to verify that this is possible.

1... Fixed part 2... Ruled line of mountain fold 3... Ruled line of mountain fold 10... Top side sheet 11... Polygonal area 13... Opening 14... Spout 15 ...Top side side surface 16...Top side connecting piece 17...Top bi-fold ruled line 18...Top side fixing part
2 0...Bottom side sheet 21...Polygonal area 25...Bottom side side 26...Bottom side connecting piece 27...Bottom bi-fold ruled line 28...Bottom side fixing part
3 0 ... Top surface 31 ... Bottom surface 32 ... Gap 33 ... Internal space 34 ... Fin-shaped panel 40 ... Body section 50 ... Molding device 51 ... Pedestal 52 ...・Jig 53...Adsorption mechanism 54...Sucker 55...Hole 56...Nozzle 57...Arrow 58...Arrow 59...Gap 60...Arrow 61...Arrow 62 ...Arrow 63...Porous material 64...Arrows 70, 72...Male molds 71, 73...Female mold 100...Packaging container A...Area B...Area C...・Area D...Area

Claims (9)

A method for molding a packaging container that can be molded from a flat state to a box-like state, in which a top sheet and a bottom sheet are connected to each other along the entire circumference at their respective peripheries, the method comprising:
The top side sheet is
a polygonal area provided at the center and serving as a top surface when the packaging container is in the box shape;
an opening formed in a polygonal region serving as the top surface;
a side surface on the top side of a quadrilateral whose sides are each side of the polygonal region serving as the top surface;
a top-side connecting piece formed between the mutually adjacent top-side side surfaces so as to connect the top-side side surfaces;
a top-side bifold ruled line formed on the top-side connecting piece so that the top-side connecting piece can be folded in half so that the adjacent sides of the adjacent top-side side surfaces coincide with each other;
a top-side fixing portion provided on at least a portion of the periphery and fixed to a portion of the bottom-side sheet;
including at least a polygonal region serving as the top surface and a top-side partition ruled line that partitions the top-side side surface ;
The bottom side sheet is
a polygonal area provided at the center and serving as a bottom surface when the packaging container is in the box shape;
a bottom side surface of a quadrilateral whose sides are each side of the polygonal region serving as the bottom surface;
a bottom-side connecting piece formed between the bottom-side side surfaces adjacent to each other so as to connect the bottom-side side surfaces;
a bottom-side bifold ruled line formed on the top-side connecting piece so that the bottom-side connecting piece can be folded in half so that adjacent sides of the adjacent bottom-side side surfaces coincide with each other;
a bottom-side fixing portion provided on at least a portion of the periphery and fixed to a portion of the bottom-side sheet;
including at least a polygonal region serving as the bottom surface and a bottom side partition ruled line that partitions the bottom side surface,
By stacking the top side sheet and the bottom side sheet and fixing the top side fixing part and the bottom side fixing part to each other, the flat state is sealed except for the opening. the packaging container is formed;
Regarding the packaging container in the flat state,
The top-side connecting piece is folded in half along the top-side bifold ruled line so that the two areas separated by the top-side bifold ruled line overlap each other, and the bottom side connecting piece is folded in half along the top-side bifold ruled line. A side surface including the top side side surface and the bottom side side surface is formed by folding in half along the bifold ruled line and overlapping the two areas separated by the bottom side bifold ruled line,
By attaching the top-side connecting piece and the bottom-side connecting piece folded in half to the side surface along the side surface, the box-shaped state can be formed;
Folding the top side sheet along the top side bifold ruled line and the top side division ruled line to give a folding habit along the top side bifold ruled line and the top side division ruled line. and,
folding the bottom side sheet along the bottom side bifold ruled line and the bottom side division ruled line to give a folding habit along the bottom side bifold ruled line and the bottom side division ruled line;
fixing the top-side fixing part of the top-side sheet and the bottom-side fixing part of the bottom-side sheet to each other to form the packaging container in the flat state;
a step of mounting the packaging container in the flat state with the top side sheet facing the pedestal;
applying a suction mechanism to the polygonal region serving as the bottom surface;
By moving the suction mechanism in the thickness direction away from the polygonal region of the top side sheet while adsorbing the polygonal region of the bottom surface, the volume inside the packaging container is reduced. and press each of the top-side side surface and the bottom-side side surface from the outside with a plurality of jigs to form the side surface, and press the top-side connecting piece between the adjacent jigs. and a step of folding each of the bottom side connecting pieces in half to form a gap inside the packaging container;
A method for molding a packaging container, comprising the step of attaching the top-side connecting piece and the bottom-side connecting piece folded in half to the side surface along the side surface. 2. The method for molding a packaging container according to claim 1, wherein in the step of forming a gap inside the packaging container, gas is blown into the packaging container from the opening. Claim 1 or Claim 2, characterized in that in the step of forming a void inside the packaging container, a polygonal region of the top side sheet is fixed by suction to the base. Method for forming the packaging container described. A packaging container molding device for carrying out the packaging container molding method according to any one of claims 1 to 3,
a pedestal for mounting the packaging container in a flat state with the top sheet facing;
a suction mechanism for suctioning a polygonal region serving as a bottom surface of the packaging container;
a mechanism for moving the suction mechanism in a direction away from a polygonal region of the top side sheet that is the top surface of the packaging container;
a plurality of movable jigs that push in the top-side side surface and the bottom-side side surface of the packaging container from the outside to form side surfaces;
The plurality of movable jigs are configured to push in the top-side side surface and the bottom-side side surface from the outside, and at the same time to sandwich the top-side connecting piece and the bottom-side connecting piece together with the other adjacent movable jigs. A packaging container molding device characterized by being equipped with a mechanism. 5. The packaging container molding apparatus according to claim 4, wherein the suction mechanism includes a suction cup. 6. The packaging container molding apparatus according to claim 4, wherein the pedestal is provided with a mechanism for fixing the polygonal region serving as the top surface by suction. The packaging container according to any one of claims 4 to 6, wherein the base has a mechanism for blowing gas into the packaging container from an opening of the packaging container. Molding equipment. 8. The packaging container molding apparatus according to claim 7, wherein the gas blowing mechanism includes a mechanism capable of discharging a part of the blown gas from the opening. The gas blowing mechanism is characterized in that, after blowing the gas into the packaging container from the opening, it is possible to maintain a state in which the internal pressure of the packaging container is higher than the external pressure for a predetermined period of time. The molding device according to claim 7.

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