JP7135572B2 - Packaging container manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing a packaging container.

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

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

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. According to the invention of this patent application, it can be transformed between a box-shaped state and a flat state. It is possible to obtain a packaging container capable of

In addition, this packaging container is provided with an opening, and by attaching a spout to this opening, the contents can be filled and poured out through this spout (Japanese Patent Application No. 2017-245358 ).

An object of the present invention is to provide a method of manufacturing a spout-equipped packaging container on the assumption that the packaging container can be repeatedly deformed between a box-shaped state and a flat state. It is.

That is, the invention according to claim 1 includes three parts consisting of a top side sheet, a spout attached to the top side sheet, and a bottom side sheet, and the top side sheet and the bottom side sheet are overlapped, A method for manufacturing a packaging container that is fixed to each other along its perimeter and that can be deformed between a box-shaped state and a flat state,
The top-side sheet has a polygonal top surface in the center and an opening in the top surface, and has a quadrangular top surface with each side of the polygonal top surface as one side. It has the same number of side surfaces as the number of sides of the polygonal top surface, and has top-side connecting pieces between adjacent top-side side surfaces that connect and close the top-side side surfaces. and, on the outside of the top-side side surface and the top-side connecting piece, there is a top-side fixing portion that is fixed to the bottom-side sheet, and the side that constitutes the adjacent top-side side surface of the quadrangular shape It has a structure in which creases for folding the top-side double-folding pieces are provided so that the top-side connecting pieces can be folded in half so that the top-side connecting pieces are aligned with each other,
The bottom-side sheet has a polygonal bottom surface in the center, and has the same number of square bottom-side 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 adjacent to each other, bottom side connecting pieces are provided to connect and close the bottom side surfaces, and the top side sheet is fixed to the outside of the bottom side surfaces and the bottom side connecting pieces. It has a bottom-side fixing portion, and is provided with a bottom-side double-folding ruled line that can fold the bottom-side connecting piece in two so that the sides forming the bottom-side side surfaces of the adjacent quadrilaterals match each other. has a structure that
a spout-equipped top-side sheet manufacturing step of manufacturing a spout-mounted top-side sheet by attaching the spout to the opening of the top-side sheet;
a fixing step of fixing the top-side fixing portion of the spouted top-side sheet and the bottom-side fixing portion of the bottom-side sheet to each other;
A method for manufacturing a packaging container, comprising:

Next, the invention according to claim 2 is the manufacturing according to claim 1, wherein the step of manufacturing the spouted top-side sheet is a step of attaching the spout after manufacturing the top-side sheet. The method.

Next, in the invention according to claim 3, the spouted top side sheet manufacturing step includes mounting the spout on a sheet forming the top side sheet, punching the sheet, and mounting the spout on the top side sheet. 2. A manufacturing method according to claim 1, characterized in that it is a step of manufacturing side sheets.

Next, according to a fourth aspect of the invention, the spout has a cylindrical body and a flange projecting outward from an end of the cylindrical body, and the step of mounting the spout is provided. and welding the flange portion of the spout to the inner surface of the packaging container.

In the packaging container of the present invention, the top-side sheet and the bottom-side sheet having the structure described above are fixed to each other over the entire periphery at their peripheral edges. It can be transformed from a flat state to a box shape by folding in two along the top-side double-folding ruled line and the bottom-side connecting piece. In addition, by pulling the fixed portion of the box-shaped packaging container toward the outside of the container, the top-side connecting piece and the bottom-side connecting piece that have been folded in half are opened, and the packaging container is deformed into a flat state. do. This deformation is reversible, so it can be deformed repeatedly.

In the present invention, since the top-side sheet and the bottom-side sheet are fixed to each other after the spout is attached to the opening of the top-side sheet, deformation between the box-shaped state and the flat state is prevented. It is possible to manufacture a packaging container equipped with a spout.

FIG. 1 relates to a first specific example of the manufacturing method of the present invention, and is a plan view of the top side sheet. FIG. 2 relates to the first embodiment of the manufacturing method of the present invention, and is a plan view of the bottom side sheet. FIG. 3 is a perspective view of a spout relating to a first specific example of the manufacturing method of the present invention. FIG. 4 relates to the first embodiment of the manufacturing method of the present invention, and is an explanatory perspective view of the spout mounting step. FIG. 5 relates to the first specific example of the manufacturing method of the present invention, and is a perspective view for explaining the fixing process. FIG. 6 is a perspective view of the packaging container manufactured according to the first embodiment of the manufacturing method of the present invention in a box-like state. FIG. 7 relates to a modification of the first specific example of the manufacturing method 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 manufacturing method of the present invention, and is a plan view of the top side sheet. FIG. 9 relates to a second embodiment of the manufacturing method of the present invention, and is a plan view of the bottom side sheet. FIG. 10 is a perspective view of the packaging container manufactured according to the second embodiment of the manufacturing method of the present invention in a box-like state. FIG. 11 is a plan view of the top side sheet according to the third embodiment of the manufacturing method of the present invention. FIG. 12 is a plan view of the bottom side sheet according to the third embodiment of the manufacturing method of the present invention. FIG. 13 is a perspective view of the packaging container manufactured according to the third embodiment of the manufacturing method of the present invention in a box-like state.

Hereinafter, specific examples of the present invention will be described with reference to the drawings. 1 to 6 relate to a first specific example of the manufacturing method of the present invention, of which FIGS. 1 to 3 show component parts of a packaging container 1 to be manufactured. That is, the packaging container 1 manufactured by the manufacturing method of the present invention is composed of at least three parts, a top-side sheet 1A, a bottom-side sheet 1B, and a spout 1C. 2 is a plan view of the bottom side sheet 1B, and FIG. 3 is a perspective view of the spout 1C.

(Top side sheet 1A)
First, the top side sheet 1A has a polygonal top surface 1A10 at its center. In this example, it is rectangular. An opening 1A11 is provided in the top surface 1A10.

Next, the top-side sheet 1A has rectangular top-side side surfaces 1A21 to 1A24 with each side of the polygonal top surface 1A10 as a ruled line for folding. there is The number of top side side surfaces 1A21 to 1A24 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.

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 combined shape of the top side side surfaces 1A21 to 1A24 and the top side connecting pieces 1A31 to 1A34 constitutes a rectangle, and the top side connecting pieces 1A31 to 1A34 are It is positioned at the corner and closes the space between the side surfaces 1A21 to 1A24 on the top side. 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. The top-side double-folding ruled line 1A33c has been described above using the top-side connecting piece 1A33 as an example. 1A34c is provided.

Next, the top-side sheet 1A is provided with a top-side fixing portion that is fixed to the bottom-side sheet 1B on the outside of the rectangular portion formed by combining the top-side side surfaces 1A21 to 1A24 and the top-side connecting pieces 1A31 to 1A34. It has 1A40. In this example, the top-side fixing portion 1A40 is configured with a heat-sealed region over the entire circumference. , part of the top-side fixing portion 1A40 can be configured by the folding ruled line 1AB that separates the top-side sheet 1A and the bottom-side sheet 1B.

As can be seen from the drawing, the edge 1Ay of the top side fixing portion 1A40 forms the outline of the top side fixing portion 1A40 and the edge (outline) of the top side sheet 1A. . In this example, the shape of the edge 1Ay of the top side sheet 1A is substantially rectangular, and the corners thereof are chamfered to remove sharp portions. A mark for alignment with the bottom-side sheet 1B may be provided on the edge of the top-side sheet 1A. The alignment mark can be composed of a concave portion recessed from the edge of the top side sheet 1A or a convex portion protruding from the edge of the top portion side sheet 1A.

In FIG. 1, the top-side fixing portion 1A40 is shown hatched, and the boundaries between this top-side fixing portion 1A40 and the top-side side surfaces 1A21 to 1A24, and the top-side fixing portion 1A40 and the top side The boundaries with the connecting pieces 1A31 to 1A34 are indicated by dashed lines 1Ax, but these are provided for convenience of explanation. Unlike the boundary 1Bx between the bottom-side fixed portion 1B40 and the bottom-side side surfaces 1B21 to 1B24 of the bottom-side sheet 1B, which will be described later, there is a folding ruled line at the boundary between the top-side fixed portion 1A40 and the top-side side surfaces 1A21 to 1A24. do not do. There is also no folding ruled line on the boundary between the top fixing portion 1A40 and the top connecting pieces 1A31 to 1A34.

The top-side sheet 1A can be made of any material, but preferably has a heat-sealable resin layer on the inner surface of the packaging container 1 (inner surface). The heat-sealable resin layer on the inner surface plays two roles. That is, first, it is welded to the flange portion 1C2 of the spout 1C to fix it. Secondly, the fixing portion 140 of the packaging container 1 is formed by heat-sealing the top side fixing portion 1A40 of the top side sheet 1A and the bottom side fixing portion 1B40 of the bottom side sheet 1B. Polyolefin-based resins such as polyethylene resins and polypropylene resins can be used as heat-sealable resins.

For example, a laminate film obtained by laminating a thermoplastic resin layer or a heat-sealable resin layer on a paper substrate layer can be suitably used as the top-side sheet 1A. In addition to these, a barrier layer, a functional film, or the like may be added as appropriate depending on the required functions. For example, the top part is formed by laminating a polyethylene resin layer on the outer surface of the paper, sequentially laminating a polyethylene resin layer, an aluminum foil, a polyester resin film, and a polyethylene resin layer on the inner surface, and forming the inner surface of the polyethylene resin layer. This is the side sheet 1A. The ends of the top-side sheet 1A may be protected by a known method.

(Bottom sheet 1B)
Next, the bottom sheet 1B has the same structure as the top sheet 1A. First, the bottom sheet 1B has a polygonal bottom surface 1B10 in the center. The polygonal bottom surface 1B10 has the same shape and size as the top surface 1A10.

In addition, the bottom sheet 1B uses each side of the polygonal bottom surface 1B10 as a ruled line for folding, and the square bottom side surfaces 1B21 to 1B24 having each side as one side is the number of sides of the polygonal bottom surface 1B10. have the same number. These bottom-side side surfaces 1B21 to 1B24 also have the same shape and size as the top-side side surfaces 1A21 to 1A24, respectively.

Further, the bottom sheet 1B has bottom side connecting pieces 1B31 to 1B34 between the bottom side side surfaces 1B21 to 1B24 adjacent to each other to connect and block the bottom side side surfaces 1B21 to 1B24. These bottom side connecting pieces 1B31 to 1B34 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 1B21 to 1B24 and the bottom side connecting pieces 1B31 to 1B34. In addition, each of the bottom side connecting pieces 1B31 to 1B34 is provided with bottom side double-folding creases 1B31c to 1B34c that bisect the bottom side connecting pieces 1B31 to 1B34 from each vertex of the bottom surface 1B10.

Next, the bottom side sheet 1B has a bottom side fixing portion 1B40 to be fixed to the top side sheet 1A outside the rectangular portion formed by combining the bottom side side surfaces 1B21 to 1B24 and the bottom side connecting pieces 1B31 to 1B34. is doing. In this example, the bottom side fixing portion 1B40 is a heat-sealed area over the entire circumference.

As can be seen from the drawing, the contour line 1By of the bottom side fixing portion 1B40 constitutes the contour line of the bottom side fixing portion 1B40 and the edge (outline line) of the bottom side sheet 1B. In this example, its outline is substantially rectangular. It is also possible to provide an alignment mark with the top-side sheet 1A on the edge of the bottom-side sheet 1B. The alignment mark can be configured by a concave portion recessed from the edge of the bottom side sheet 1B or a convex portion protruding from the edge of the bottom side sheet 1B.

The bottom-side sheet 1B may have the same shape and size as the top-side sheet 1A, but the outer shape of the bottom-side sheet 1B may be configured to be smaller than the outer shape of the top-side sheet 1A. When the bottom side sheet 1B is configured to be smaller than the top side sheet 1A, it is desirable that the difference be 0.6 mm or more in both the vertical and horizontal directions. When the bottom side sheet 1B is made smaller than the top side sheet 1A by 0.6 mm or more in this manner, the outer appearance of the manufactured packaging container can be made beautiful when deformed into a box shape. In this example, the bottom side sheet 1B has the same shape and size as the top side sheet 1A.

Bending ruled lines 1Bx are provided at the boundaries between the bottom side fixed portion 1B40 and the bottom side side surfaces 1B21 to 1B24 of the bottom side sheet 1B and at the boundaries between the bottom side fixed portion 1B40 and the bottom side connecting pieces 1B31 to 1B34. there is Since there is no crease line for folding at the boundary of the top side fixing portion 1A40 of the top side sheet 1A, when the two sheets 1A and 1B are overlapped and fixed to form a box shape, both fixed portions are fixed to each other. The portions 1A40 and 1B40 are folded toward the bottom side sheet 1B along the folding ruled line 1Bx, and the outside thereof is covered with the top side sheet 1A.

The bottom sheet 1B can also be made of any material, but preferably has a heat-sealable resin layer on the inner surface of the packaging container 1 (inner surface). The heat-sealing resin layer on the inner surface heat seals the top-side fixing portion 1A40 of the top-side sheet 1A and the bottom-side fixing portion 1B40 of the bottom-side sheet 1B to secure the fixing portion 140 of the packaging container 1. It has a role to form.

For example, as the bottom-side sheet 1B, a laminated film obtained by laminating a thermoplastic resin layer or a heat-sealable resin layer on a paper-made base material layer can be suitably used as in the top-side sheet 1A. 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 edges of the bottom sheet 1B may be edge-protected by a known method.

(Spout 1C)
The spout 1C includes a cylindrical body portion 1C1 and a flange portion 1C2.

The cylindrical body portion 1C1 is inserted into the opening 1A11 of the top side sheet 1A, and is provided with a channel penetrating in the vertical direction at the center thereof. Alternatively, the contents inside the packaging container 1 can be poured out.

The flange portion 1C2 projects outward from the end portion of the cylindrical body portion 1C1. By welding the flange portion 1C2 to the periphery of the opening portion 1A11 of the top-side seat 1A, the spout 1C is attached to the top portion. It can be fixed to the side sheet 1A.

(Manufacturing process of top side sheet with spout)
Next, the step of manufacturing the spouted top side sheet is a step of manufacturing the spouted top side sheet by attaching the spout 1C to the opening 1A11 of the top side sheet 1A.

The spout 1C may be attached after manufacturing the top side seat 1A, but the top side seat with the spout can also be manufactured by the following method.

That is, first, the opening 1A11 is provided at a predetermined position of the leaf-shaped or rolled-up sheet forming the top side sheet 1A, and the spout 1C is attached to the opening 1A11. It is possible to manufacture the attached top side sheet. In addition, each folding ruled line can be formed in the arbitrary process. For example, the openings 1A11 may be formed in the sheet in a sheet or roll form, and at the same time, each folding ruled line may be formed. It is also possible to manufacture a top-side sheet fitted with a spout. Alternatively, the sheet may be punched out to manufacture the top-side sheet with the spout attached thereto, and at the same time, the creases for folding may be formed. Alternatively, each folding ruled line may be formed between the spout mounting step and the sheet punching step, or each folding ruled line may be formed after the sheet is punched out.

Taking as an example the case where the spout 1C is attached after the top-side sheet 1A is manufactured, this step is performed on the inner surface side of the packaging container 1 of both surfaces of the top-side sheet 1A, as shown in FIG. This can be done by inserting the cylindrical body portion 1C1 of the spout 1C from the surface (inner surface) side and welding the flange portion 1C2 to the opening portion 1A11. Either one or both of the top-side sheet 1A and the cylindrical body portion 1C1 can be heat-pressed to weld them together, or they can be welded by ultrasonic welding.

(fixing process)
The fixing step is a step of fixing the top-side fixing portion 1A40 of the top-side sheet 1A and the bottom-side fixing portion 1B40 of the bottom-side sheet 1B to each other. This step must be performed after the step of manufacturing the spouted top side sheet. That is, the top-side sheet 1A used in this process is equipped with the spout 1C.

As shown in FIG. 4, this fixing step can be performed by aligning and overlapping the top side sheet 1A and the bottom side sheet 1B and heat-sealing both the fixing portions 1A40 and 1B40. Either one or both of the top-side sheet 1A and the bottom-side sheet 1B can be heat-pressed to weld them together, or they can be heat-sealed by applying ultrasonic waves. The fixing portions 1A40 and 1B40 do not need to be heat-sealed over their entire widths, but need to be heat-sealed so that the sheets 1A and 1B can be fixed to each other over their entire circumferences. The peel strength is desirably 9N or more.

Through this process, the flat packaging container 1 can be manufactured. The plan view thereof is the same as the plan view (FIG. 1) of the top side sheet 1A.

(How to transform from a flat state to a box-shaped state)
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 1B31 to 1B34 folded over on the outer surface.

In order to transform the flat packaging container 1 into a box shape, the top side connecting pieces 1A31 to 1A34 and the bottom side connecting pieces 1B31 to 1B34 are aligned with the top side double-folding crease line 1A31c located in the center. 1A34c and the crease lines 1B31c to 1B34c for folding in half on the bottom side are all folded in half so that they form a mountain fold 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 side connecting piece 1A33 will be described with reference to the enlarged view of FIG. Side 1A23b of top-side side 1A23 and side 1A24b of top-side side 1A24 located on both sides overlap each other.

By the way, in the packaging container 1 in a flat state, the top-side connecting piece 1A33 of the top-side sheet 1A and the bottom-side connecting piece 1B33 of the bottom-side sheet 1B are precisely overlapped, and the top-side double-folding crease 1A33c is formed. and bottom-side double-folding lines 1B33c are also precisely overlapped with each other. When folding, the bottom-side connecting piece 1B33 of the bottom-side sheet 1B is also folded in half along the bottom-side double-folding ruled line 1B33c. Therefore, the side 1B23b of the bottom side surface 1B23 and the side 1B24b of the bottom side surface 1B24 located on both sides of the bottom side connecting piece 1B33 also overlap each other.

Since the top-side side surface 1A23 of the top-side sheet 1A and the bottom-side side surface 1B23 of the bottom-side sheet 1B are continuous via the container fixing portion 140, the two side surfaces 1A23 and 1B23 form a box shape. A side surface 123 of the packaging container 1 is configured.

In addition, since the top-side joint piece 1A33 of the top-side sheet 1A and the bottom-side joint piece 1B33 of the bottom-side sheet 1B are also continuous via the container fixing portion 140, the two joint pieces 1A33 and 1B33 are formed. When the portion is called a container connecting piece 133, the container connecting piece 133 connects the side surfaces and closes them. That is, the top-side side surface 1A23 and the bottom-side side surface 1
A side surface 123 composed of B23 and a side surface 124 composed of a top-side side surface 1A24 and a bottom-side side surface 1B24 are connected by a container connecting piece 133, and there is no gap here. It is blocked like this.

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 1B33 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 1B31 is arranged such that the central top side two-folding ruled line 1A31c and the bottom side two-folding ruled line 1B31c both face the outer surface of the container. A side surface 121 composed of a top side surface 1A21 and a bottom side surface 1B21 and a side surface 122 composed of a top side surface 1A22 and a bottom side surface 1B22 are formed by folding in two so as to form a mountain fold. The side 121 and the side 122 are connected and closed by a container connecting piece 131 . In addition, the container connecting piece 132 composed of the top side connecting piece 1A32 and the bottom side connecting piece 1B32 is arranged such that the central top side two-folding ruled line 1A32c and the bottom side two-folding ruled line 1B32c both face the outer surface of the container. A side surface 123 composed of a top side side surface 1A22 and a bottom side side surface 1B22 and a side surface 123 composed of a top side side surface 1A23 and a bottom side surface 1B23 are formed by folding in two so as to form a mountain fold. The side 122 and the side 123 are connected and closed by a container connecting piece 1B32. Further, the connecting piece 134 composed of the top-side connecting piece 1A34 and the bottom-side connecting piece 1B34 is arranged so that the center top-side double-folding ruled line 1A34c and the bottom-side double-folding ruled line 1B34c both face the outer surface of the container. By folding in two so as to form a mountain fold, a side 124 composed of a top side side 1A24 and a bottom side 1B24 and a side 121 composed of a top side 1A21 and a bottom side 1B21 are formed. , and the side surface 124 and the side surface 121 are connected by a container connecting piece 134 to be closed.

By folding all of the container connecting pieces 131 to 134 in this way, the side surfaces 121 to 124 are formed, and accordingly, the packaging is folded along the predetermined folding lines to form a box-shaped package. A container 1 can be manufactured. The box-shaped packaging container 1 has a top surface 1A10 and a bottom surface 1B10, and side surfaces 121 to 124 are provided around the top surface 1A10. is closed, it is in a sealed state except for the opening 1A11.

A folding ruled line is provided on the boundary 1Bx of the bottom side fixing portion 1B40 of the bottom side sheet 1B, and a folding ruled line is provided on the boundary 1Ax of the top side fixing portion 1A40 of the top side sheet 1A. Therefore, the container fixing portion 140 formed by heat-sealing both fixing portions 1A40 and 1B40 is folded toward the bottom side sheet 1B. That is, the bottom-side fixed portion 1B40 is folded toward the bottom-side sheet 1B at the folding ruled line provided at the boundary 1Bx, and the top-side fixed portion 1A40 of the top-side sheet 1A is folded at the boundary 1Ax. It is superimposed on the outer surface side of the bottom side fixing portion 1B40 of the bottom side sheet 1B.

At this time, if the bottom-side sheet 1B is configured to be smaller than the top-side sheet 1A, the edge 1By of the bottom-side sheet 1B is covered with the top-side fixing portion 1A40 of the top-side sheet 1A. never be exposed. When the dimension of the bottom side sheet 1B is smaller than that of the top side sheet 1A by 0.6 mm or more, even if there is a positional deviation between the top side sheet 1A and the bottom side sheet 1B, the deviation is zero. If it is within 0.3 mm, the edge 1By of the bottom side sheet 1B will not protrude from the top side sheet 1A and be exposed.

When the connecting pieces 131 to 134 are thus folded in half to manufacture the box-shaped packaging container 1, it is desirable to fold in half while blowing air or the like from the opening 11. As shown in FIG.

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 fixed to the respective side surfaces 121 to 124 by adhesives, adhesive tapes, hook-and-loop fasteners, snap buttons, or other joining members. By laminating the resin, it can be fixed by heat such as hot air and pressure. It is also possible to cover the box-shaped packaging container 1 with a cylindrical sleeve and fold the connecting pieces 131 to 134 onto the side surfaces 121 to 124 of the packaging container 1 .

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

(How to use packaging container 1)
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 step. Then, after the packaging container 1 is deformed into a box shape in the content filling step, the content is filled from the opening 1A11 and the opening 1A11 is closed, whereby a package containing the content can be obtained. .

After the contents are discharged, the package containing the contents in the box-like state can be returned to the flat state again. Thus, the package can be repeatedly transformed between a box-shaped state and a flat state.

(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 1B, and the top side sheet 1A and the bottom side sheet 1B are separated by a folding ruled line 1AB. Others are the same as the first specific example. For this reason, the top-side fixing portion of the top-side sheet 1A is composed of the folding ruled line 1AB and the heat-sealed area, and the folding ruled line 1AB and the heat-sealed area are combined to form the top-side fixing portion. It is configured to surround the entire circumference of the seat 1A. Similarly, the bottom-side fixing portion of the bottom-side sheet 1B is composed of the folding ruled line 1AB and the heat-sealed area. configured to surround. By folding along the folding ruled lines 1AB, the top side sheet 1A and the bottom side sheet 1B 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. In this example, the top surface 2A10 of the top side sheet 2A is a regular hexagon, and the bottom surface 2B10 of the bottom side sheet 2B is a regular hexagon having the same shape and size as the top surface 2A10. Others are the same as the first specific example. This packaging container 2 can also be manufactured by the same method as the first specific example, and can be repeatedly deformed between the box-shaped state and the flat state by the same method as the first specific example. .

(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 an equilateral triangle, and the bottom surface 3B10 of the bottom side sheet 3B is an equilateral triangle having the same shape and size as the top surface 3A10. Others are the same as those of the first specific example and the second specific example. This packaging container 3 can also be manufactured by the same method as in the first and second specific examples, and can be repeatedly deformed between a box-shaped state and a flat state.

1: Packaging container 1A: Top side sheet 1A10: Top surface 1A11: Opening 1A21 to 1A24: Top side side 1A31 to 1A34: Top side connecting piece 1A33c: Top side double-folding ruled line 1Ay: Top side sheet 1B: bottom side sheet 1B10: bottom surface 1B21 to 1B24: bottom side surface 1B31 to 1B34: bottom side connecting piece 1B33c: bottom side double folding crease 1By: bottom side sheet edge 1C: spout 1C1: cylindrical body Part 1C2: Flange part 2: Packaging container 3: Packaging container

Claims (4)

It consists of three parts: a top sheet, a spout attached to the top sheet, and a bottom sheet. A method for manufacturing a packaging container that can be deformed between a box-shaped state and a flat state, comprising:
The top-side sheet has a polygonal top surface in the center and an opening in the top surface, and has a quadrangular top surface with each side of the polygonal top surface as one side. It has the same number of side surfaces as the number of sides of the polygonal top surface, and has top-side connecting pieces between adjacent top-side side surfaces that connect and close the top-side side surfaces. and, on the outside of the top-side side surface and the top-side connecting piece, there is a top-side fixing portion that is fixed to the bottom-side sheet, and the side that constitutes the adjacent top-side side surface of the quadrangular shape It has a structure in which creases for folding the top-side double-folding pieces are provided so that the top-side connecting pieces can be folded in half so that the top-side connecting pieces are aligned with each other,
The bottom-side sheet has a polygonal bottom surface in the center, and has the same number of square bottom-side 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 adjacent to each other, bottom side connecting pieces are provided to connect and close the bottom side surfaces, and the top side sheet is fixed to the outside of the bottom side surfaces and the bottom side connecting pieces. It has a bottom-side fixing portion, and is provided with a bottom-side double-folding ruled line that can fold the bottom-side connecting piece in two so that the sides forming the bottom-side side surfaces of the adjacent quadrilaterals match each other. has a structure that
a spout-equipped top-side sheet manufacturing step of manufacturing a spout-mounted top-side sheet by attaching the spout to the opening of the top-side sheet;
a fixing step of fixing the top-side fixing portion of the spouted top-side sheet and the bottom-side fixing portion of the bottom-side sheet to each other;
A method of manufacturing a packaging container, comprising: 2. The manufacturing method according to claim 1, wherein the step of manufacturing the spouted top-side sheet is a step of attaching the spout after manufacturing the top-side sheet. The step of manufacturing the spouted top-side sheet is a step of attaching the spout to a sheet forming the top-side sheet, and then punching the sheet to manufacture the spout-equipped top-side sheet. The manufacturing method according to claim 1. The spout has a cylindrical body and a flange projecting outward from an end of the cylindrical body, and the step of attaching the spout includes placing the flange of the spout on the inner surface side of the packaging container. 4. The manufacturing method according to any one of claims 1 to 3, characterized by having a step of welding to.

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