JP7119752B2 - packaging container - Google Patents

Description

The present invention relates to packaging containers.

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

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

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, the packaging container is provided with an opening through which contents can be filled and poured out.

However, when the packaging container is made of a material containing paper, the end surface of the paper is exposed through the opening, so there is a problem that the contents permeate the end surface of the paper during filling or pouring. rice field.

A spout can be attached to this opening to protect the edge of the paper. It caused it to drop.

The present invention provides a packaging container that is made of a material containing paper and that can be repeatedly deformed between a box-shaped state and a flat state. To provide a packaging container which does not require a spout and prevents contents from penetrating into the paper end surface of an opening part on the premise of a packaging container which can be poured out.

That is, the invention according to claim 1 includes a top side sheet and a bottom side sheet, the top side sheet and the bottom side sheet are overlapped 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 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
The top-side sheet is composed of a top-side sheet base material, and a waterproof outer film and an inner film arranged on both inner and outer surfaces thereof,
The top-side sheet base material is made of a material containing paper, and has through holes penetrating the top-side sheet base material,
Both the outer film and the inner film have an annular projecting portion that projects inward from the periphery of the through hole,
The annular projecting portion of the outer film and the annular projecting portion of the inner film are sealed to each other to form an edge covering portion that covers the edge of the top-side sheet base material exposed in the through hole, and , wherein the opening is provided in the edge covering portion.

Next, the invention according to claim 2 is characterized in that at least one of the outer film and the inner film is bonded to the top side sheet base material over the entire surface except for the through holes. The packaging container according to claim 1.

Next, the invention according to claim 3 is the packaging container according to claim 1, wherein at least one of the outer film and the inner film is made of an annular film.

Next, the invention according to claim 4 is characterized in that the top side sheet base material has a multilayer structure in which a waterproof layer is laminated on the inner surface side of paper. It is the described packaging container.

Next, the invention according to claim 5 is the packaging container according to claim 4, wherein the top side sheet base material has a gas barrier layer.

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 addition, in the present invention, although the top-side sheet is made of a material containing paper, the top-side sheet is provided with through holes, and waterproof outer films and inner films are arranged on both the inner and outer surfaces of the top-side sheet. The film is provided with an annular projecting portion projecting toward the inside of the through hole, and the annular projecting portions are sealed to each other to cover the edge of the top side sheet base material exposed to the through hole. Since the top-side sheet opening is provided in the edge covering portion, the edge surface of the paper at the opening is covered with the waterproof edge covering portion and is not exposed to the opening. do not have. Therefore, even if the opening is not fitted with a spout, even if the content is filled or poured out through the opening, the content will not permeate the paper edge surface of the opening. .

FIG. 1 relates to a first specific example of the packaging container of the present invention, FIG. 1(a) is a plan view showing an example of the top side sheet, and FIG. 1(b) is a cross-sectional view of the essential parts thereof. FIG. 2 is a plan view showing an example of the bottom side sheet according to the first specific example of the packaging container of the present invention. FIG. 3 is a perspective view of the first embodiment of the packaging container of the present invention in its box-like state. FIG. 4 relates to a second specific example of the packaging container of the present invention, FIG. 4(a) is a plan view showing another example of the top side sheet, and FIG. 4(b) is a cross-sectional view of the main part thereof. FIG. 5 is a plan view of the fifth embodiment of the packaging container of the present invention, in which one sheet constitutes both the top side sheet and the bottom side sheet. FIG. 6 relates to a sixth embodiment of the packaging container of the present invention, and is a plan view of the top side sheet. FIG. 7 relates to a sixth embodiment of the packaging container of the present invention and is a plan view of the bottom side sheet thereof. FIG. 8 relates to a sixth embodiment of the packaging container of the present invention, and is a perspective view of the box-shaped state thereof. FIG. 9 relates to a seventh embodiment of the packaging container of the present invention, and is a plan view of the top side sheet. FIG. 10 is a plan view of the bottom side sheet of the seventh embodiment of the packaging container of the present invention. FIG. 11 is a perspective view of the seventh embodiment of the packaging container of the present invention in its box-like state.

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

[First specific example]
1 to 3 relate to a first embodiment of the packaging container of the present invention, and this packaging container is composed of at least two parts, a top side sheet and a bottom side sheet. Of these two parts, an example of the top side sheet is shown in FIG. 1, and an example of the bottom side sheet is shown in FIG.

(Top side sheet 1A)
First, the top-side sheet 1A shown in FIG. 1 will be described. This 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. The structure of this opening 1A11 will be described later.

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.

Next, the structure of the opening 1A11 will be described together with the material forming the top side sheet 1A with reference to FIG. 1(b).

The top-side sheet 1A is composed of a top-side sheet base material 1Aa, and waterproof outer films 1Ab and inner films 1Ac disposed on both inner and outer surfaces thereof.

In order to secure the physical strength of the packaging container 1, the top-side sheet base material 1Aa is made of a material including paper. Since the top-side sheet base material 1Aa contains paper in this manner, the shape of the packaging container 1 can be maintained when the packaging container 1 is in a box shape. Note that the top-side sheet base material 1Aa may be made of a material having a multi-layer structure in which optional sheets are laminated on paper other than paper. When the top-side sheet base material 1Aa is made of a multi-layered material in this way, the ends of the top-side fixing portion 1A40 may be end-face protected by a known method.

The top-side sheet base material 1Aa has a through hole 1Aa11 that penetrates the top-side sheet base material 1Aa. As can be seen from the drawing, the opening 1A11 is formed using this through hole 1Aa11.

Both the outer film 1Ab and the inner film 1Ac are joined to the top-side sheet base material 1Aa over the entire surface except for the through holes 1Aa11. It has annular projecting portions 1Ab1 and 1Ac1 projecting from the periphery of 1Aa11 toward the interior of through hole 1Aa11. The annular overhanging portions 1Ab1 and 1Ac1 are sealed together to form an end edge covering portion 1Abc that covers the edge of the top side sheet base material 1Aa exposed in the through hole 1Aa11. A hole is provided in the center of the edge covering portion 1Abc, and this hole constitutes the opening portion 1A11.

As the waterproof outer film 1Ab, any plastic resin layer or metal foil, or a vapor deposition film obtained by providing a metal vapor deposition layer or an inorganic vapor deposition layer on a plastic film can be used.

The inner film 1Ac may be the same as the outer film 1Ab, but should have a heat-sealing resin layer on its innermost surface in order to heat-seal the top-side fixing portion 1A40 with the bottom-side fixing portion 1B40 of the bottom-side sheet 1B. is desirable. In addition, when a part of the layer structure of the inner film 1Ac has a gas barrier layer, the storage stability of the liquid content accommodated in the packaging container 1 can be enhanced.

Examples of such outer film 1Ab and inner film 1Ac include a polyolefin resin layer such as a polyethylene resin layer and a polypropylene resin layer, a polyester resin layer, a polyamide resin layer, and the like. Moreover, the gas barrier layer can be exemplified by metal foil and the vapor deposition film. As the heat-sealable resin layer, the aforementioned polyolefin resin layer can be exemplified. Of course, a film having a multilayer structure in which these are laminated may be used.

Also, the top side sheet 1A can be manufactured through the following steps.

That is, first, through holes 1Aa11 are provided in the top-side sheet base material 1Aa.

Next, covering the through holes 1Aa11, the outer film 1Ab and the inner film 1Ac are laminated on both inner and outer surfaces of the top side sheet base material 1Aa. This lamination can be carried out, for example, by using an adhesive, or by pressure bonding via molten resin. Moreover, you may laminate|stack by a heat seal. By this lamination, both the outer film 1Ab and the inner film 1Ac are joined to the top side sheet base material 1Aa at the periphery of the through hole 1Aa11.

Next, the outer film 1Ab and the inner film 1Ac projecting toward the inside of the through hole 1Aa11 are heat-sealed to each other to form the edge covering portion 1Abc.

Finally, the top side sheet 1A can be manufactured by providing a hole in the center of the edge covering portion 1Abc to form an opening portion 1A11.

Note that each folding ruled line can be provided in an arbitrary step.

(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.

As the bottom sheet 1B, a laminated film obtained by laminating a thermoplastic resin layer or a heat-sealable resin layer on paper can be suitably used. 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, a polyethylene resin layer is laminated on the outer surface side of the paper, and a polyethylene resin layer, an aluminum foil, a polyester resin film, and a polyethylene resin layer are sequentially laminated on the inner surface side, and the inner surface is the bottom side composed of the polyethylene resin layer. This is sheet 1B. The edges of the bottom sheet 1B may be edge-protected by a known method.

(Method for manufacturing flat packaging container 1)
The flat packaging container 1 can be manufactured by aligning and stacking the top side sheet 1A and the bottom side sheet 1B, and heat-sealing both 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. 3 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, a container connecting piece 133 connects a side surface 123 composed of a top side surface 1A23 and a bottom side surface 1B23 and a side surface 124 composed of a top side surface 1A24 and a bottom side surface 1B24. Moreover, it is closed so as not to create a gap here.

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 surface 124 composed of a top side surface 1A24 and a bottom side surface 1B24 and a side surface 121 composed of a top side surface 1A21 and a bottom side surface 1B21 are configured. , 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. 3 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 process. Since the flat packaging container 1 is not fitted with a spout, it occupies a small volume. Therefore, for example, a large number of packaging containers 1 can be stacked and accommodated inside a cardboard box and transported. is.

Then, in the content filling step, the packaging container 1 in a flat state is taken out from a cardboard box or the like, and after being deformed into a box shape, the content is filled from the opening 1A11 and the opening 1A11 is closed. It can be a package containing contents.

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.

As described above, since the edge of the top-side sheet base material 1Aa of the opening 1A11 is covered with the edge-covering part 1Abc, the top-side sheet base material 1Aa can be removed when the liquid content is filled or discharged. The edges of the paper contained in the paper do not come into contact with the liquid contents and do not penetrate. There is no need to attach the spout to the opening 1A11.

[Second example]
This example is the same as the first specific example except that the outer film 2Ab and the inner film 2Ac of the top side sheet 2A are made of annular films. In FIG. 4A, the annular outer film 2Ab is hatched.

However, in this top-side sheet 2A, it is desirable that the top-side sheet base material 2Aa is made of a material having a multi-layer structure in which a waterproof layer is laminated on the inner surface side of paper. This is to prevent the liquid contents from coming into contact with and permeating the paper when the packaging container 1 contains the liquid contents. Moreover, it is desirable that the innermost surface is made of a heat-sealable resin. For example, it is a film with a multi-layer structure in which a waterproof layer is laminated on the outer surface of paper and a waterproof layer with gas barrier properties is laminated on the inner surface, and the innermost surface is made of heat-sealable resin. be. 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 base material 2Aa.

Examples of the annular outer film 2Ab and inner film 2Ac include a polyolefin resin layer such as a polyethylene resin layer and a polypropylene resin layer, a polyester resin layer, a polyamide resin layer, and the like. Of course, a film having a multi-layer structure in which these are laminated may also be used.

This top-side sheet 2A can also be manufactured in the same manner as the above-described top-side sheet 1A. That is, both the outer film 2Ab and the inner film 2Ac are joined to the peripheries of the through holes 2Aa11 of the top side sheet base material 2Aa in which the through holes 2Aa11 are formed. is provided to form the opening 2A11, the top side sheet 1A can be manufactured.

Further, the top side sheet 2A can also be manufactured by bonding both the outer film 2Ab and the inner film 2Ac, which have been made annular in advance, to the top side sheet base material 2Aa. After the outer film 2Ab and the inner film 2Ac are joined to the top-side sheet base material 2Aa, the annular projecting portions 2Ab1 and 2Ac1 projecting toward the inside of the through hole 2Aa11 are adhered to each other to form the edge covering portion 2Abc. At the same time, the opening 2A11 may be formed.

[Third to fourth specific examples]
As described above, the first specific example using the top-side sheet 1A in which both the outer film 1Ab and the inner film 1Ac are joined to the top-side sheet base material 1Aa over the entire surface excluding the through holes, and the outer film 2Ab and Although the second specific example using the top-side sheet 2A in which both the inner film 2Ac is made of an annular film has been described, the present invention is not limited to this, and the following top-side sheet 3A or 4A is used. Packaging containers 3 and 4 are also possible.

That is, in the third specific example (not shown) of the present invention, as the top sheet 3A, the outer film 3Ab is joined to the top side sheet base material over the entire surface except for the through holes, and the inner film 3Ac is annular. This example is composed of a film, and is the same as the first specific example shown in FIG. 1 except for this point.

In a fourth specific example (not shown) of the present invention, the outer film 4Ab of the top sheet 4A is made of a ring-shaped film, and the inner film 4Ab is a top-side sheet base over the entire surface except for the through holes. It may be one that is joined to the material.

[Fifth specific example]
Next, a fifth specific example will be described with reference to FIG. In this packaging container 1, one sheet constitutes both the top-side sheet 5A and the bottom-side sheet 5B, and the top-side sheet 5A and the bottom-side sheet 5B are separated by folding ruled lines 5AB. Others are the same as the first specific example.

For this reason, the top-side fixed portion of the top-side sheet 5A is composed of the folding ruled line 5AB and the heat-sealed area, and the folding ruled line 5AB 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 5A. Similarly, the bottom-side fixing portion of the bottom-side sheet 5B is composed of the folding ruled line 5AB and the heat-sealed area, and the folding ruled line 5AB and the heat-sealed area together form the entire perimeter of the bottom-side sheet 5B. configured to surround. By folding along the folding lines 5AB, the top side sheet 5A and the bottom side sheet 5B can be overlapped.

[Sixth specific example]
Next, a sixth specific example of the present invention will be described with reference to FIGS. 6 to 8. FIG. In this example, the top surface 6A10 of the top side sheet 6A is formed in a regular hexagonal shape, and the bottom surface 6B10 of the bottom side sheet 6B is formed in a regular hexagonal shape having the same shape and size as the top surface 6A10. Others are the same as the first specific example. This packaging container 6 can also be manufactured by the same method as in the first specific example, and can be repeatedly deformed between the box-shaped state and the flat state by the same method as in the first specific example. .

[Seventh specific example]
Next, a seventh specific example of the present invention will be described with reference to FIGS. 9 to 11. FIG. The packaging container 7 has a top surface 7A10 of the top side sheet 7A formed in an equilateral triangle shape, and a bottom surface 7B10 of the bottom side sheet 7B formed in an equilateral triangle shape of the same shape and size as the top surface 7A10. Others are the same as the first specific example. This packaging container 7 can also be manufactured by the same method as in the first specific example, and can be repeatedly deformed between a box-shaped state and a flat state.

(Example 1)
This example is an example of a packaging container corresponding to the second specific example. That is, this is an example in which the outer film 2Ab and the inner film 2Ac of the top-side sheet 2A are made of annular films.

As the top-side sheet base material 2Aa and the bottom-side sheet 2B, a polyethylene resin layer (thickness: 25 μm), paper (basis weight: 250 g/m ² ), and aluminum foil (thickness: 6 μm) are used in order from the outer surface of the packaging container 2. , a polyester resin layer (thickness of 12 μm), and a polyethylene resin layer (thickness of 40 μm). Among these layers, the aluminum foil imparts gas barrier properties to the top side sheet 2A. A polyethylene resin layer having a thickness of 40 μm constitutes the innermost surface of the packaging container 2 and has heat sealability.

Further, as the annular outer film 2Ab, a polyethylene resin layer (40 μm thick), a polyester resin layer (12 μm thick), a polyamide resin layer (15 μm thick), a polyester resin layer (12 μm thick), and a polyethylene resin layer are used in this order. A multi-layered film was used in which layers (40 μm thick) were laminated. As can be seen from this layer structure, the outer film 2Ab is symmetrical.

The annular inner film 2Ac has a multilayer structure in which a polyethylene resin layer (40 μm thick), a polyester resin layer (12 μm thick), a polyamide resin layer (15 μm thick), and a polyester resin layer (12 μm thick) are laminated in this order. film was used.

Then, through holes 2Aa11 were provided in the top-side sheet base material 2Aa, and the outer film 2Ab and the inner film 2Ac were adhered to both surfaces, respectively. The inner film 2Ac was adhered to the top-side sheet base material 2Aa so that the polyethylene resin layer having a thickness of 40 μm was positioned on the inner surface side of the packaging container 2 . Further, the outer film 2Ab and the inner film 2Ac are adhered so as to cover the through hole 2Aa11 of the top side sheet base material 2Aa. After the outer film 2Ab and the inner film 2Ac projecting toward the inside of the through hole 2Aa11 are heat-sealed to form the edge covering portion 2Abc, a hole is finally provided in the center of the edge covering portion 2Abc. 2 A of sheet|seats 2A for top parts were manufactured by forming opening part 2 A11.

Next, the top sheet 2A and the bottom side sheet 2B are superimposed, and the surrounding top side fixing portion 2A40 and bottom side fixing portion 2B40 are heat-sealed to manufacture a flat packaging container 2. .

Next, while blowing air from the opening 2A11 of the packaging container 2 in the flat state, the connecting pieces 231 to 234 are folded in two, deformed into a box shape, and each connecting piece protruding from the outer surface of the packaging container 2. Pieces 231 to 234 were folded over each side 221 to 224 of packaging container 2 to form the container shape shown in FIG.

(Example 2)
This example is an example of a packaging container corresponding to specific example 4. That is, this is an example in which the outer film 4Ab of the top side sheet 4A is made of an annular film, and the inner film 4Ac is joined to the top side sheet base material 4Aa over the entire surface except for the through holes 4Aa11.

As the top-side sheet base material 4Aa, a two-layer structure sheet was used in which a polyethylene resin layer (thickness: 25 μm) and paper (basis weight: 250 g/m ² ) were laminated in this order from the outer surface of the packaging container 2 .

Further, as in Example 1, the bottom side sheet 4B consists of a polyethylene resin layer (thickness: 25 μm), paper (basis weight: 250 g/m ² ), aluminum foil (thickness: 6 μm), from the outer surface of the packaging container 4 in this order. ), a polyester resin layer (12 μm thick), and a polyethylene resin layer (40 μm thick).

As the annular outer film 4Ab, as in Example 1, a polyethylene resin layer (40 μm thick), a polyester resin layer (12 μm thick), a polyamide resin layer (15 μm thick), a polyester resin layer (thickness 12 μm) and a polyethylene resin layer (40 μm in thickness) laminated in this order.

As the inner film 4Ac, a multi-layer sheet was used in which a polyethylene resin layer (25 μm thick), an aluminum foil (6 μm thick), a polyester resin layer (12 μm thick), and a polyethylene resin layer (40 μm thick) were laminated. .

Further, as the bottom side sheet 4B, from the outer surface of the packaging container 4, a polyethylene resin layer (thickness: 25 μm), paper (basis weight: 250 g/m ² ), aluminum foil (thickness: 6 μm), polyester resin layer (thickness: 12 μm thick) and a polyethylene resin layer (40 μm thick).

Then, the flat packaging container 4 is manufactured in the same manner as in Example 1, and is deformed into a box shape. Figure 3
It was arranged in the container shape shown in .

(Example 3)
This example is an example of a packaging container corresponding to the first specific example. That is, this is an example in which both the outer film 1Ab and the inner film 1Ac of the top-side sheet 1A are joined to the top-side sheet base material 1Aa over the entire surface except for the through holes 1Aa11.

As the top-side sheet base material 1Aa, a single piece of paper (basis weight: 250 g/m ² ) was used.

A polyethylene resin film (25 μm thick) was used as the outer film 1Ab.

As the inner film 1Ac, a sheet having a multilayer structure in which a polyethylene resin layer (thickness 25 μm), an aluminum foil (thickness 6 μm), a polyester resin layer (thickness 12 μm), and a polyethylene resin layer (thickness 40 μm) are laminated was used. .

In addition, as the bottom side sheet 1B, from the outer surface of the packaging container 1, a polyethylene resin layer (thickness: 25 μm), paper (basis weight: 250 g/m ² ), aluminum foil (thickness: 6 μm), polyester resin layer (thickness: 12 μm thick) and a polyethylene resin layer (40 μm thick).

Then, the flat packaging container 1 is manufactured in the same manner as in Example 1, and is deformed into a box shape. The container shape shown in FIG. 3 was prepared.

(Comparative example)
This example is an example in which a spout is attached to a through hole. Neither the outer film nor the inner film of the top-side sheet was used, and therefore the edge covering portion for covering the edge of the top-side sheet substrate exposed to the through-hole was not formed.

The top-side sheet and the bottom-side sheet used in this example are, in order from the outer surface of the packaging container, a polyethylene resin layer (thickness of 25 μm), paper (basis weight of 250 g/m ² ), aluminum foil (thickness of 6 μm), The sheet has a multi-layer structure in which a polyester resin layer (thickness 12 μm) and a polyethylene resin layer (thickness 40 μm) are laminated.

A through hole was provided in the top side sheet to serve as an opening, and a spout was attached to the opening. The spout was inserted into the opening from the inner side of the packaging container, the pouring tube was projected to the outer side, and the flange of the spout was heat-sealed to the inner side of the packaging container.

Then, using the top-side sheet and the bottom-side sheet to which the spouts are attached in this manner, a flat packaging container is manufactured in the same manner as in Example 1, and the packaging container is deformed into a box shape, and each The connecting pieces were folded on each side of the packaging container 1 to adjust the shape of the container.

(evaluation)
Each of the packaging containers of Examples 1 to 3 and the packaging container of Comparative Example was deformed into a flat state, and 50 of each were stacked and housed in a corrugated cardboard box. Then, when the volume occupied by the 50 flat packaging containers was measured, the volume occupied by the packaging containers of Examples 1 to 3 was all 100 cm ³ or less, whereas the packaging container of the comparative example was The volume occupied was about 320 cm ³ .

From these results, it was found that both the packaging container of the present invention and the packaging container of the comparative example were filled with the contents through the opening, or even when the contents were poured out, the contents permeated the paper edge surface of the opening. However, it can be understood that the packaging container of the present invention has higher loading efficiency than the packaging container of the comparative example.

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 edge 1Aa: top side sheet base material 1Aa11: through hole 1Ab: outer film 1Ab1: annular overhanging portion 1Ac: inner film 1Ac1: annular overhanging portion 1Abc: edge covering portion 1B: bottom side sheet 1B10: bottom surface 1B21 to 1B24 : bottom-side side surface 1B31 to 1B34: bottom-side connecting piece 1B33c: bottom-side double-folding ruled line 1By: bottom-side sheet edge 2: packaging container 2A: top-side sheet 2A10: top surface 2A11: opening 2Aa: top Side sheet base material 2Aa11: through hole 2Ab: outer film 2Ab1: annular projecting portion 2Ac: inner film 2Ac1: annular projecting portion 2Abc: edge covering portion 6: packaging container 7: packaging container

Claims (5)

It comprises a top-side sheet and a bottom-side sheet, the top-side sheet and the bottom-side sheet are overlapped and fixed to each other along the entire periphery, and the box-shaped state and the flat state are formed. A packaging container that can be deformed between
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
The top-side sheet is composed of a top-side sheet base material, and a waterproof outer film and an inner film arranged on both inner and outer surfaces thereof,
The top-side sheet base material is made of a material containing paper, and has through holes penetrating the top-side sheet base material,
Both the outer film and the inner film have an annular projecting portion that projects inward from the periphery of the through hole,
The annular projecting portion of the outer film and the annular projecting portion of the inner film are sealed to each other to form an edge covering portion that covers the edge of the top-side sheet base material exposed in the through hole, and , a packaging container, wherein said opening is provided in said edge covering portion. 2. The packaging container according to claim 1, wherein at least one of the outer film and the inner film is bonded to the top side sheet base material over the entire surface except for the through holes. 2. The packaging container according to claim 1, wherein at least one of said outer film and inner film is made of an annular film. The packaging container according to any one of claims 1 to 3, wherein the top-side sheet base material has a multi-layer structure in which a waterproof layer is laminated on the inner surface side of paper. 5. The packaging container according to claim 4, wherein the top-side sheet base material has a gas barrier layer.

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