JP7314587B2 - packaging container - Google Patents

Description

TECHNICAL FIELD The present invention relates to a packaging container that can be transformed from a flat state to a box-shaped state.

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

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

Since the packaging container of Patent Document 1 can be easily dismantled for disposal, it is useful for reducing the volume of waste.

JP-A-9-290822

In order to deal with such problems, the present applicant filed Japanese Patent Application No. 2017-143706. This packaging container can be reversibly deformed between a box-shaped state and a flat state, and can be transformed from a flat state to a box-shaped state, or vice versa, from a box-shaped state to a flat state.

However, in this packaging container, the state inside the packaging container could not be observed from the outside. For example, the remaining amount of stored contents decreases as it is consumed, but the remaining amount could not be confirmed by observing from the outside of the packaging container.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a packaging container that can be transformed from a flat state to a box-like state, and that allows the state of the inside of the packaging container to be observed from the outside.

That is, the invention according to claim 1 is a packaging container that is formed by stacking a top side sheet and a bottom side sheet and fixing them to each other along the entire circumference at the rims thereof, and that can be deformed between a box-shaped state and a flat state,
The top side sheet and the bottom side sheet each have the following structure,
The packaging container is characterized in that the following transparent plate and the following spout are constituted by integrally molded plastic parts .
Structure of the top side sheet:
It has a polygonal top surface in the center, and an opening is provided in the top surface, and the opening is provided with a plug.
is installed and
It has the same number of quadrangular top side surfaces as the number of sides of the polygonal top surface, each side of the polygonal top surface being one side,
Between the top side surfaces adjacent to each other, there is a top side connecting piece that connects and closes the top side side surfaces,
Outside the top side surface and the top connecting piece, there is a top side fixing portion for fixing to the bottom side sheet,
A top-side double-folding ruled line is provided so that the top-side connecting piece can be folded in two so that the sides forming the top-side side surfaces of the adjacent quadrilaterals match each other,
A see-through window is provided on at least one of the side surfaces on the top side, and the see-through window is closed with a transparent plate.
structure.
Construction of the bottom sheet:
It has a polygonal bottom in the center,
It has the same number of square bottom side surfaces as the number of sides of the polygonal bottom surface, each side of the polygonal bottom surface being one side,
Between each bottom side surface adjacent to each other, there is a bottom side connecting piece that connects and closes the bottom side surfaces,
Bottom side fixing portions for fixing to the top side sheet are provided on the outside of the bottom side side surface and the bottom side connecting piece,
bottom-side double-folding creases are provided so that the bottom-side connecting pieces can be folded in half so that the sides forming the bottom-side side surfaces of the adjacent quadrangular shapes match each other;
structure.

Next, the invention according to claim 2 is a packaging container that is formed by stacking a top side sheet and a bottom side sheet and fixing them to each other along the entire circumference at the rims thereof, and that can be deformed between a box-shaped state and a flat state,
The top side sheet and the bottom side sheet each have the following structure,
The packaging container is characterized in that the following transparent plate and the following spout are constituted by integrally molded plastic parts .
Structure of the top side sheet:
It has a polygonal top surface in the center , and an opening is provided in the top surface, and a plug is attached to the opening,
It has the same number of quadrangular top side surfaces as the number of sides of the polygonal top surface, each side of the polygonal top surface being one side,
Between the top side surfaces adjacent to each other, there is a top side connecting piece that connects and closes the top side side surfaces,
Outside the top side surface and the top connecting piece, there is a top side fixing portion for fixing to the bottom side sheet,
A top-side double-folding ruled line is provided so that the top-side connecting piece can be folded in two so that the sides forming the top-side side surfaces of the adjacent squares are aligned.
structure.
Structure of the bottom sheet:
It has a polygonal bottom in the center,
It has the same number of square bottom side surfaces as the number of sides of the polygonal bottom surface, each side of the polygonal bottom surface being one side,
between the bottom side surfaces that are adjacent to each other, there is a bottom side connecting piece that connects and closes the bottom side surfaces;
Bottom side fixing portions for fixing to the top side sheet are provided on the outside of the bottom side side surface and the bottom side connecting piece,
a ruled line for folding the bottom-side connecting piece in two so that the sides forming the bottom-side side surfaces of the adjacent squares are aligned with each other, and
A see-through window is provided on at least one of the side surfaces on the bottom side, and the see-through window is closed with a transparent plate.
structure.

Next, the invention according to claim 3 is the packaging container according to claim 1 or 2 , wherein the plastic part is provided with a linear bent portion that can be bent, and the position of this linear bent portion corresponds to the boundary between the top surface and the side surface on the top side.

Next, the invention according to claim 4 is the packaging container according to claim 3 , wherein the linear bending portion is formed by a groove provided in the plastic part.

The packaging container of the present invention is made of a sheet material and can be deformed between a box-shaped state and a flat state. Moreover, since a see-through window is provided on at least one of the side surfaces on the top side or the side on the bottom side and the see-through window is closed with a transparent plate, the state inside the packaging container can be observed from the outside. For example, when part of the contents is consumed, the remaining amount can be checked from the outside of the packaging container.

FIG. 1 relates to a first specific example of the packaging container of the present invention, FIG. 1(a) is a plan view of the top side sheet seen from the outer surface side of the packaging container, and FIG. 1(b) is a plan view of the top side sheet seen from the inner surface side of the packaging container. FIG. 2 is a perspective view of a plastic part relating to a first specific example of the packaging container of the present invention. FIG. 3 is a cross-sectional view of the main part for explanation of the top side sheet to which the plastic parts are attached, according to the first embodiment of the packaging container of the present invention. FIG. 4 relates to the first embodiment of the packaging container of the present invention and is a plan view of the bottom side sheet. FIG. 5 is an exploded perspective view of the packaging container in a flat state according to the first embodiment of the packaging container of the present invention. FIG. 6 is a perspective view of a box-shaped packaging container according to a first embodiment of the packaging container of the present invention. FIG. 7 relates to a modification of the first specific example of the packaging container of the present invention, and is a plan view of a case where one sheet constitutes both the top side sheet and the bottom side sheet. FIG. 8 relates to a second specific example of the packaging container of the present invention, and is a plan view of the top side sheet. FIG. 9 relates to a second embodiment of the packaging container of the present invention, and is a plan view of the bottom side sheet. FIG. 10 relates to a second embodiment of the packaging container of the present invention and is a perspective view of its box-like state. FIG. 11 relates to a third embodiment of the packaging container of the present invention, and is a plan view of the top side sheet. FIG. 12 relates to a third embodiment of the packaging container of the present invention, and is a plan view of the bottom side sheet. FIG. 13 relates to a third embodiment of the packaging container of the present invention, and is a perspective view of the box-shaped state thereof.

Hereinafter, specific examples of the present invention will be described with reference to the drawings.

(First specific example)
1 to 6 relate to a first specific example of the package of the present invention, and FIGS. 1(a) and 1(b) are respectively a plan view of the top-side sheet 1A viewed from the outer surface side of the packaging container, and a plan view of the top-side sheet 1A viewed from the inner surface side of the packaging container.

The top side sheet 1A has a polygonal top surface 1A10 at its center. In this example, it is rectangular. An opening is provided in the top surface 1A10, and a plug 1Bβ is attached to the opening. The plug 1Bβ is a part of the plastic part 1B, and the plastic part 1B will be described later.

Next, the top-side sheet 1A has square-shaped top-side side surfaces 1A21 to 1A24 with each side of the polygonal top surface 1A10 as a ruled line for folding. The number of side surfaces 1A21 to 1A24 on the top side is the same as the number of sides of the polygonal top surface 1A10. In this example, since the top surface 1A10 is square, the square top surface 1A10 has four sides and four side surfaces 1A21 to 1A24.

A see-through window 1Aα is provided on at least one of the four top-side side surfaces 1A21 to 1A24. In this example, a see-through window 1Aα is provided on the side surface 1A22 on the top side. This see-through window 1Aα is closed with a transparent plate 1Bα. This transparent plate 1Bα is also a part of the plastic part 1B, and will be described later together with the plug 1Bβ.

In this example, the see-through window 1Aα is provided on the top-side side surface, and this see-through window 1Aα is closed by the transparent plate 1Bα.

Further, the top-side sheet 1A has top-side connecting pieces 1A31 to 1A34 that connect the top-side side surfaces 1A21 to 1A24 between the mutually adjacent top-side side surfaces. That is, the top-side connecting piece 1A31 connects the top-side side surface 1A21 and the top-side side surface 1A22. Moreover, the top-side side surface 1A22 and the top-side side surface 1A23 are connected by a top-side connecting piece 1A32. The same applies to the other side surfaces on the top side. Folding lines are provided between the top side side surfaces 1A21 to 1A24 and the top side connecting pieces 1A31 to 1A34.

The top side connecting pieces 1A31 to 1A34 close the top side side surfaces 1A21 to 1A24. As shown in the figure, in this example, the outer shape of the combined portion of the top-side side surfaces 1A21-1A24 and the top-side connecting pieces 1A31-1A34 constitutes a rectangle, and each of the top-side connecting pieces 1A31-1A34 is positioned at the corners to block the space between the top-side side surfaces 1A21-1A24. For example, the space between the top side surface 1A21 and the top side surface 1A22 is blocked by the top side connecting piece 1A31.

The top-side connecting pieces 1A31 to 1A34 have crease lines for bi-folding the top-side connecting pieces 1A31 to 1A34 from each vertex of the top surface 1A10. That is, as shown enlarged in FIG. 1, for example, the top side surface 1A23 and the top side surface 1A24 share the vertex 1A10b of the top surface 1A10. Among the sides forming the top-side side surface 1A23, the sides sharing the vertex 1A10b of the top surface 1A10 are denoted by reference numeral 1A23b. Further, among the sides forming the top side surface 1A24, the side sharing the vertex 1A10b of the top surface 1A10 is denoted by reference numeral 1A24b. A ruled line 1A33c for double folding on the top side is provided to bisect the angle formed by the side 1A23b and the side 1A24b. That is, in the figure, the angle α1 formed by the side 1A23b and the double-folding ruled line 1A33c is equal to the angle α2 formed by the side 1A24b and the top-side double-folding ruled line 1A33c. Although the top-side double-folding ruled line 1A33c has been described above using the top-side connecting piece 1A33 as an example, the other top-side connecting pieces 1A31 to 1A32 and 1A34 are similarly provided with the top-side double-folding ruled lines 1A31c to 1A32c and 1A34c.

Next, the top-side sheet 1A has a top-side seal portion 1A40 that seals with the bottom-side sheet 1C over the entire periphery of the rectangular portion formed by combining the top-side side surfaces 1A21 to 1A24 and the top-side connecting pieces 1A31 to 1A34.

In FIGS. 1A and 1B, the top side seal portion 1A40 is hatched, and the boundaries between the top side seal portion 1A40 and the top side side surfaces 1A21 to 1A24 and the boundaries between the top side seal portion 1A40 and the top side connecting pieces 1A31 to 1A34 are indicated by dashed lines 1Ax, which are provided for convenience of explanation. Unlike the boundary 1Cx between the bottom seal portion 1C40 of the bottom sheet 1C and the bottom side surfaces 1C21 to 1C24, which will be described later, there is no folding ruled line at the boundary between the top seal portion 1A40 and the top side surfaces 1A21 to 1A24. There is also no folding ruled line at the boundary between the top side seal portion 1A40 and the top side connecting pieces 1A31 to 1A34.

Next, as shown in the perspective view of FIG. 2, the plastic part 1B is composed of a molded plastic product in which the transparent plate 1Bα and the plug 1Bβ are integrally molded. A bendable linear bent portion 1Bγ is provided between the transparent plate 1Bα and the plug 1Bβ. In this example, the linear bent portion 1Bγ is composed of a groove provided in the plastic part 1B, but is not limited to this and may have any structure.

Then, this plastic part 1B is joined to the inner surface of the top sheet 1A, and the plug 1Bβ is inserted into the opening of the top surface 1A10. Also, at this time, the linear bent portion 1Bγ must be arranged so as to correspond to the boundary between the top surface 1A10 and the top side surface 1A22, that is, the folding ruled line 1A10γ forming the side of the top surface 1A10. When the position of the linear folding portion 1Bγ corresponds to the folding ruled line 1A10γ in this way, when the top side sheet 1A is folded along the folding ruled line 1A10γ, the plastic part 1B is also folded at the linear folding portion 1Bγ.

It goes without saying that when the plastic part 1B is joined to the inner surface of the top sheet 1A in this way, the transparent plate 1Bα must cover the see-through window 1Aα.

The top-side sheet 1A and the plastic part 1B can be joined by any method. For example, the bonding can be performed by hot pressing. Also, although it is not necessary to bond the entire surface of the plastic part 1B, it is desirable to bond both the periphery of the opening of the top surface 1A10 and the periphery of the see-through window 1Aα in a liquid-tight manner.

It should be noted that the transparent plate and the plug may be configured as separate molded products, and these may be joined to the top sheet 1A, respectively. On the other hand, when using a plastic part 1B in which the transparent plate 1Bα and the plug 1Bβ are integrally molded, positioning is possible by inserting the plug 1Bβ into the opening of the top surface 1A10.

Next, the bottom sheet 1C has the same structure as the top side sheet 1A except for three points described later (see FIG. 4). First, the bottom sheet 1C has a polygonal bottom surface 1C10 in the center. The polygonal bottom surface 1C10 has the same shape and size as the top surface 1A10. The first difference between the bottom sheet 1C and the top side sheet 1A is that the top surface 1A10 of the top side sheet 1A is provided with an opening, whereas the bottom surface 1C10 of the bottom sheet 1C is not provided with an opening.

In addition, the bottom sheet 1C has square bottom side surfaces 1C21 to 1C24 having each side of the polygonal bottom surface 1C10 as a ruled line for folding, and having the same number of sides as the polygonal bottom surface 1C10. These bottom-side side surfaces 1C21 to 1C24 also have the same shape and size as the top-side side surfaces 1A21 to 1A24, respectively.

These bottom-side side surfaces 1C21 to 1C24 are not provided with see-through windows. Since at least one of the top-side side surfaces 1A21 to 1A24 is provided with the see-through window 1Aα, this point is the second difference between the bottom-side sheet 1C and the top-side sheet 1A.

However, it is also possible to provide a see-through window on any of the bottom side surfaces 1C21 to 1C24. When the see-through windows are provided on the side surfaces 1C21 to 1C24 on the bottom side in this way, these see-through windows also need to be closed with a transparent plate. In this case, the see-through window may or may not be provided on the side surface on the top side.

Next, the bottom sheet 1C has bottom side connecting pieces 1C31 to 1C34 between the bottom side side surfaces 1C21 to 1C24 that are adjacent to each other to connect and block the bottom side side surfaces 1C21 to 1C24. These bottom side connecting pieces 1C31 to 1C34 have the same shape and size as the top side connecting pieces 1A31 to 1A34.

In addition, creases for folding are provided between the bottom-side side surfaces 1C21 to 1C24 and the bottom-side connecting pieces 1C31 to 1C34. In addition, each of the bottom side connecting pieces 1C31 to 1C34 is provided with bottom side double folding ruled lines 1C31c to 1C34c that bisect the bottom side connecting pieces 1C31 to 1C34 from each vertex of the bottom surface 1C10.

Next, the bottom side sheet 1C has a bottom side seal portion 1C40 that seals with the top side sheet 1C outside the rectangular portion formed by combining the bottom side side surfaces 1C21 to 1C24 and the bottom side connecting pieces 1C31 to 1C34. In this example, the bottom side fixing portion 1C40 is a heat-sealed area over the entire circumference.

Bending ruled lines 1Cx are provided at the boundaries between the bottom side seal portion 1C40 of the bottom side sheet 1C and the bottom side side surfaces 1C21 to 1C24 and at the boundaries between the bottom side seal portion 1C40 and the bottom side connecting pieces 1C31 to 1C34. Since there is no folding ruled line at the boundary of the top-side seal portion 1A40 of the top-side sheet 1A, this point is the third difference between the bottom-side sheet 1C and the top-side sheet 1A. Since the bottom side sheet 1C is provided with the folding ruled line 1Cx and the top side sheet 1A does not have the folding ruled line 1Cx, when the two sheets 1A and 1C are overlapped and sealed to form a box shape, both the sealed portions 1A40 and 1C40 are folded toward the bottom side sheet 1C side by the folding ruled line 1Cx, and the top side sheet 1A covers the outside thereof. Therefore, the edges of the bottom sheet 1C are not exposed to the outer surface of the packaging container 1 even in the box-shaped state.

Next, the top side sheet 1A and the bottom side sheet 1C to which the plastic parts 1B are joined are aligned and stacked (see FIG. 5), and the fixing portions 1A40 and 1C40 are heat-sealed to each other, whereby the packaging container 1 in a flat state can be manufactured.

Next, a method for transforming the flat packaging container 1 into a box shape will be described. FIG. 6 shows the packaging container 1 deformed into a box shape, with the connecting pieces 1A31 to 1A34 and 1C31 to 1C34 folded over on the outer surface.

In order to transform the flat packaging container 1 into a box-shaped state, the top side connecting pieces 1A31 to 1A34 and the bottom side connecting pieces 1C31 to 1C34 are folded in half so that the top side double-folding lines 1A31c to 1A34c and the bottom side double-folding lines 1C31c to 1C34c are all mountain-folded with respect to the outer surface of the container. As a result of this folding, the sides forming adjacent side surfaces of the top-side side surfaces 1A21 to 1A24 of the top-side sheet 1A overlap with each other. The top connecting piece 1A33 will be explained with reference to the enlarged view of FIG.

By the way, in the flat packaging container 1, the top-side connecting piece 1A33 of the top-side sheet 1A and the bottom-side connecting piece 1C33 of the bottom-side sheet 1C are precisely overlapped, and the top-side double-folding ruled line 1A33c and the bottom-side double-folding ruled line 1C33c are also accurately overlapped with each other, and the top-side connecting piece 1A33 of the top-side sheet 1A is aligned with the top-side double-folding ruled line 1A33c. , the bottom-side connecting piece 1C33 of the bottom-side sheet 1C is also folded in half along the bottom-side double-folding ruled line 1C33c. Therefore, the side 1C23b of the bottom side surface 1C23 and the side 1C24b of the bottom side surface 1C24 located on both sides of the bottom side connecting piece 1C33 also overlap each other.

Since the top-side side surface 1A23 of the top-side sheet 1A and the bottom-side side surface 1C23 of the bottom-side sheet 1C are continuous via the container seal portion 140, these side surfaces 1A23 and 1C23 constitute the side surface 123 of the box-shaped packaging container 1.

In addition, since the top-side connecting piece 1A33 of the top-side sheet 1A and the bottom-side connecting piece 1C33 of the bottom-side sheet 1C are also connected via the container seal portion 140, if the portion formed by these two connecting pieces 1A33 and 1C33 is called a container connecting piece 133, the container connecting piece 133 connects and closes the side surfaces. That is, the side 123 composed of the top-side side 1A23 and the bottom-side side 1C23 and the side 124 composed of the top-side side 1A24 and the bottom-side side 1C24 are connected by the container connecting piece 133, and are closed so as not to form a gap there.

As described above, the case where the container connecting piece 133 composed of the top side connecting piece 1A33 and the bottom side connecting piece 1C33 is folded in half has been described as an example, but the same applies to the other connecting pieces.

That is, the container connecting piece 131 composed of the top side connecting piece 1A31 and the bottom side connecting piece 1C31 is folded in two so that the top side two-folding ruled line 1A31c and the bottom side two-folding ruled line 1C31c are both mountain-folded against the outer surface of the container. 2, and these side surfaces 121 and 122 are connected and closed by a container connecting piece 131 .

Further, the container connecting piece 132 composed of the top side connecting piece 1A32 and the bottom side connecting piece 1C32 is folded in half so that the top side double-folding line 1A32c and the bottom side half-folding line 1C32c are both mountain-folded with respect to the outer surface of the container. 3, and the container connecting piece 1C32 connects and closes the side 122 and the side 123. As shown in FIG. At this time, the plastic part 1B is also bent at the linear bending portion 1Bγ as the plastic part 1B is bent along the bending ruled line 1A10γ at the boundary between the top surface 1A10 and the top side surface 1A22.

Further, the joint piece 134 composed of the top side joint piece 1A34 and the bottom side joint piece 1C34 is folded in half so that the central top side double-folding ruled line 1A34c and the bottom side double-folding ruled line 1C34c form a mountain fold with respect to the outer surface of the container, thereby forming a side surface 124 constituted by the top side side surface 1A24 and the bottom side side surface 1C24, the top side side surface 1A21 and the bottom side surface 1C21. A container connecting piece 134 connects and closes the side surface 121 and the side surface 121 .

By folding all of the container connecting pieces 131 to 134 in this way, the side surfaces 121 to 124 are formed, so that the box-shaped packaging container 1 can be manufactured by folding along predetermined folding lines. The box-shaped packaging container 1 has a top surface 1A10 and a bottom surface 1C10, and side surfaces 121 to 124 are provided around the top surface 1A10. Moreover, since the container connecting pieces 131 to 134 block the space between the side surfaces 121 to 124, the container is in a sealed state except for the opening 1A11.

Note that the boundary 1Cx of the bottom side fixing portion 1C40 of the bottom side sheet 1C is provided with a folding ruled line, and the boundary 1Ax of the top side fixing portion 1A40 of the top side sheet 1A is not provided with a folding ruled line. That is, the bottom-side fixed portion 1C40 is folded toward the bottom-side sheet 1C along the folding ruled line provided at the boundary 1Cx, and the top-side fixed portion 1A40 of the top-side sheet 1A is not folded at the boundary 1Ax and overlaps the outer surface side of the bottom-side fixed portion 1C40 of the bottom-side sheet 1C. For this reason, the edge of the bottom side sheet 1C is covered with the top side fixing portion 1A40 of the top side sheet 1A and is not exposed to the outer surface.

Next, in the state of being deformed into the box shape, the two-fold connecting pieces 131 to 134 protrude from the outer surface of the packaging container 1 . Therefore, it is desirable that the connecting pieces 131 to 134 be folded over the respective side surfaces 121 to 124 of the packaging container 1 to improve the appearance. FIG. 6 shows the packaging container 1 in such a state that the connecting pieces 131 to 134 are folded over the respective side surfaces 121 to 124 of the packaging container 1. As shown in FIG. The connecting pieces 131 to 134 can be detachably sealed to the respective side surfaces 121 to 124 with an adhesive, an adhesive tape, or a joining member such as a hook-and-loop fastener or a snap button.

Next, in order to transform the box-shaped packaging container 1 into a flat state, the container sealing portion 140 is gripped and pulled outward from the packaging container 1 . By pulling the container seal portion 140 outward, the two-fold connecting pieces 131 to 134 are opened, and the packaging container 1 is deformed into a flat state.

This packaging container 1 can be used as follows.

That is, it is desirable to first manufacture the packaging container 1 in a flat state, store it in this state, and transfer it to the content filling process. Then, after the packaging container 1 is transformed into a box-shaped state in the content filling process, the content is filled from the spout 1Bβ attached to the opening, and the spout 1Bβ is sealed to form a package containing the content. The content to be filled may be an amount that leaves a head space inside the packaging container 1 .

When filling and sealing the contents, a hot filling method can be adopted in which the contents are filled in a heat-sterilized state. By sealing the spout 1Bβ immediately after hot filling, it is possible to seal the contents while maintaining the sterilized state. This sealing is possible, for example, by screwing a cap onto the spout 1Bβ.

Next, the state of the interior of the box-shaped package containing the contents can be observed through the see-through window 1Aα. For example, after part of the content is discharged, the remaining amount can be checked from the outside of the package.

After the contents are completely consumed, the box-shaped package can be returned to a flat state. Thus, the package can be repeatedly transformed between a box-shaped state and a flat state.

As the top-side sheet 1A and the bottom-side sheet 1C, for example, a laminated film obtained by laminating a thermoplastic resin layer or a sealant layer on a paper base layer can be preferably used. In addition to these, a barrier layer, a functional film, or the like may be added as appropriate depending on the required functions. Also, the ends of the top-side sheet 1A and the bottom-side sheet 1C may be end-face protected by a known method.

Also, the plastic part 1B can be made of any plastic. For example, polyethylene, polypropylene, polyester, polyamide and the like. Also, the molding method may be any well-known method.

(Modified example of the first specific example)
Next, a modification of the first specific example will be described with reference to FIG. In this packaging container 1, one sheet constitutes both the top side sheet 1A and the bottom side sheet 1C, and the top side sheet 1A and the bottom side sheet 1C are separated by a folding ruled line 1AC. Therefore, the top-side fixed portion of the top-side sheet 1A is composed of the folding ruled line 1AC and the heat-sealed area, and the folding ruled line 1AC and the heat-sealed area are combined to surround the entire circumference of the top-side sheet 1A. Similarly, the bottom-side fixing portion of the bottom-side sheet 1C is composed of the folding ruled lines 1AC and the heat-sealed area, and the folding ruled lines 1AC and the heat-sealed area together surround the entire periphery of the bottom-side sheet 1C. By folding along the folding ruled lines 1AC, the top side sheet 1A and the bottom side sheet 1C can be overlapped.

(Second specific example)
Next, a second specific example of the present invention will be described with reference to FIGS. 8 to 10. FIG. This packaging container 2 is an example in which the top surface 2A10 of the top side sheet 2A is formed in a regular hexagonal shape, and the bottom surface 2C10 of the bottom side sheet 2C is formed in a regular hexagonal shape having the same shape and size as the top surface 2A10. This packaging container 2 can also be repeatedly deformed between the box-shaped state and the flat state in the same manner as in the first specific example. In addition, the internal state can be observed through the see-through window 2Aα.

(Third specific example)
Next, a third specific example of the present invention will be described with reference to FIGS. 11 to 13. FIG. In this packaging container 3, the top surface 3A10 of the top side sheet 3A is formed into an equilateral triangle, and the bottom surface 3C10 of the bottom side sheet 3C is formed into an equilateral triangle having the same shape and size as the top surface 3A10. The top side sheet 3A and the bottom side sheet 3C have the same shape and size. This packaging container 3 can also be repeatedly deformed between the box-shaped state and the flat state in the same manner as in the first specific example. In addition, the internal state can be observed through the see-through window 2Aα.

1: Packaging container 1A: Top side sheet 1A10: Top surface 1A21 to 1A24: Top side surface 1A31 to 1A34: Top side connecting piece 1A33c: Top side double-folding ruled line 1A40: Top side sealing portion 1Aα: Transparent window 1B: Plastic part 1Bα: Transparent plate 1Bβ: Mouth plug 1Bγ: Linear bent portion 1C: Bottom Side sheet 1C10: bottom surface 1C21 to 1C24: bottom side surface 1C31 to 1C34: bottom side connecting piece 1C33c: bottom side double-folding ruled line 1C40: bottom side sealing part 2: packaging container 3: packaging container

Claims (4)

A packaging container formed by stacking a top side sheet and a bottom side sheet and fixing them to each other along the entire circumference at their rims, and is capable of being deformed between a box-shaped state and a flat state,
The top side sheet and the bottom side sheet each have the following structure,
A packaging container , wherein the following transparent plate and the following spout are made of integrally molded plastic parts .
Structure of the top side sheet:
It has a polygonal top surface in the center , and an opening is provided in the top surface, and a plug is attached to the opening,
It has the same number of quadrangular top side surfaces as the number of sides of the polygonal top surface, each side of the polygonal top surface being one side,
Between the top side surfaces adjacent to each other, there is a top side connecting piece that connects and closes the top side side surfaces,
Outside the top side surface and the top connecting piece, there is a top side fixing portion for fixing to the bottom side sheet,
A top-side double-folding ruled line is provided so that the top-side connecting piece can be folded in two so that the sides forming the top-side side surfaces of the adjacent quadrilaterals match each other,
A see-through window is provided on at least one of the side surfaces on the top side, and the see-through window is closed with a transparent plate.
structure.
Construction of the bottom sheet:
It has a polygonal bottom in the center,
It has the same number of square bottom side surfaces as the number of sides of the polygonal bottom surface, each side of the polygonal bottom surface being one side,
between the bottom side surfaces that are adjacent to each other, there is a bottom side connecting piece that connects and closes the bottom side surfaces;
Bottom side fixing portions for fixing to the top side sheet are provided on the outside of the bottom side side surface and the bottom side connecting piece,
A ruled line for folding the bottom-side connecting piece in half is provided so that the sides forming the bottom-side side surfaces of the adjacent quadrangular shapes are aligned with each other,
structure. A top side sheet and a bottom side sheet are superimposed and fixed to each other along the entire circumference at their peripheral edges,
A packaging container that can be transformed between a box-shaped state and a flat state,
The top side sheet and the bottom side sheet each have the following structure,
A packaging container , wherein the following transparent plate and the following spout are made of integrally molded plastic parts .
Structure of the top side sheet:
It has a polygonal top surface in the center , and an opening is provided in the top surface, and a plug is attached to the opening,
It has the same number of quadrangular top side surfaces as the number of sides of the polygonal top surface, each side of the polygonal top surface being one side,
Between the top side surfaces adjacent to each other, there is a top side connecting piece that connects and closes the top side side surfaces,
Outside the top side surface and the top connecting piece, there is a top side fixing portion for fixing to the bottom side sheet,
A top-side double-folding ruled line is provided so that the top-side connecting piece can be folded in two so that the sides forming the top-side side surfaces of the adjacent squares are aligned.
structure.
Structure of the bottom sheet:
It has a polygonal bottom in the center,
It has the same number of square bottom side surfaces as the number of sides of the polygonal bottom surface, each side of the polygonal bottom surface being one side,
between the bottom side surfaces that are adjacent to each other, there is a bottom side connecting piece that connects and closes the bottom side surfaces;
Bottom side fixing portions for fixing to the top side sheet are provided on the outside of the bottom side side surface and the bottom side connecting piece,
a ruled line for folding the bottom-side connecting piece in two so that the sides forming the bottom-side side surfaces of the adjacent squares are aligned with each other, and
A see-through window is provided on at least one of the side surfaces on the bottom side, and the see-through window is closed with a transparent plate.
structure. 3. The packaging container according to claim 1 or 2, wherein the plastic part is provided with a linear bent portion that can be bent, and the position of the linear bent portion corresponds to the boundary between the top surface and the side surface of the top portion. 4. The packaging container according to claim 3, wherein said linear bending portion is formed by a groove provided in said plastic part.

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