Paper containers

Abstract

To provide a box-shaped paper container that can be deformed into a flat state by peeling off a fin-shaped panel from a side surface of the container, in which the fin-shaped panel is laid against the side of the container, and even if the side is solidly sealed, it can be easily peeled off.SOLUTION: A gap d into which a finger can be inserted is provided between a fin-shaped panel 131 laid against a side of a container and the side 121 of the container. The gap d is, for example, 1.5 mm or more.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a paper container that is composed of a top sheet and a bottom sheet, mainly made of paper, stacked on top of each other and fixed to each other around their entire periphery, that is supplied in a flat state, can be erected to transform into a box-like shape when filled with contents, and can be returned to a flat state when empty after use. [Background technology]

[0002] Such a paper container is described in, for example, Patent Document 1.

[0003] This paper container 1 is as follows.

[0004] That is, the top side sheet 1A used in this paper container 1 has a rectangular top surface 1A10 in the center, as shown in Figure 2, and this top surface 1A10 has an opening in which a spout 1C is attached.

[0005] Next, the top-side sheet 1A has quadrangular top-side side surfaces 1A21-1A24, each of which corresponds to one side of the rectangular top surface 1A10, and which are used as folding lines along the sides of the top surface 1A10. The number of top-side side surfaces 1A21-1A24 is four, the same as the number of sides of the polygonal top surface 1A10.

[0006] The top-side sheet 1A also has top-side connecting pieces 1A31-1A34 between adjacent top-side sides that connect the top-side sides 1A21-1A24. That is, the top-side side 1A21 and the top-side side 1A22 are connected by the top-side connecting piece 1A31. The top-side side 1A22 and the top-side side 1A23 are connected by the top-side connecting piece 1A32. The same applies to the other top-side sides. Note that folding lines are provided between each of the top-side side 1A21-1A24 and the top-side connecting pieces 1A31-1A34.

[0007] The top-side connecting pieces 1A31-1A34 block the gap between the top-side side surfaces 1A21-1A24. As shown in the figure, in this example, the combined outline of the top-side side surfaces 1A21-1A24 and the top-side connecting pieces 1A31-1A34 forms a rectangle, and each of the top-side connecting pieces 1A31-1A34 is located at the corners of the rectangle, blocking the gap between the top-side side surfaces 1A21-1A24. For example, the gap between the top-side side surface 1A21 and the top-side side surface 1A22 is blocked by the top-side connecting piece 1A31.

[0008] The top-side connecting pieces 1A31-1A34 have top-side folding lines that bisect the top-side connecting pieces 1A31-1A34 from each vertex of the top surface 1A10. For example, as shown enlarged in FIG. 2, the top-side side surface 1A23 and the top-side side surface 1A24 share the vertex 1A10b of the top surface 1A10. Of the edges that make up the top-side side surface 1A23, the edge that shares the vertex 1A10b of the top surface 1A10 is indicated by the symbol 1A23b. Furthermore, of the edges that make up the top-side side surface 1A24, the edge that shares the vertex 1A10b of the top surface 1A10 is indicated by the symbol 1A24b. A top-side folding line 1A33c is provided to bisect the angle between the sides 1A23b and 1A24b, and the top-side folding line 1A33c divides the top-side connecting piece 1A33 into two regions 1A331 and 1A332. In other words, in the figure, the angle θ1 between the side 1A23b and the folding line 1A33c and the angle θ2 between the side 1A24b and the top-side folding line 1A33c are The angles θ2 are equal, and the regions 1A331 and 1A332 are the same shape and size and are arranged symmetrically with respect to the top-side folding line 1A33c as the axis of symmetry. The top-side folding line 1A33c has been described above using the top-side connecting piece 1A33 as an example, but the other top-side folding lines 1A31c-1A32c, 1A34c are also provided in the other top-side connecting pieces 1A31-1A32, 1A34.

[0009] Next, the top-side sheet 1A has a top-side fixing portion 1A40 consisting of a heat-sealed area that fixes it to the bottom-side sheet 1B outside the rectangular portion formed by the top-side side surfaces 1A21-1A24 and the top-side connecting pieces 1A31-1A34. For ease of explanation, in Figure 2, the top-side fixing portion located outside the top-side side surface 1A21 is indicated by the symbol "1A41." The symbol "1A41x" indicates the edge of this top-side fixing portion 1A41.

[0010] Next, bottom sheet 1B has the same structure as top sheet 1A, except for the points described below. That is, as shown in Figure 3, bottom sheet 1B has a rectangular bottom surface 1B10 in the center. This rectangular bottom surface 1B10 has the same shape as top surface 1A10. Bottom sheet 1B differs from top sheet 1A in that top surface 1A10 of top sheet 1A has an opening with a spout 1C attached to it, whereas bottom surface 1B10 of bottom sheet 1B has no opening and, of course, no spout attached.

[0011] The bottom sheet 1B has four rectangular bottom side surfaces 1B21-1B24, each of which corresponds to one side of the polygonal bottom surface 1B10 and is formed by folding lines along each side of the polygonal bottom surface 1B10. These bottom side surfaces 1B21-1B24 are identical in shape to the top side surfaces 1A21-1A24, respectively.

[0012] The bottom sheet 1B also has bottom connecting pieces 1B31-1B34 between adjacent bottom side surfaces 1B21-1B24, which connect and close these bottom side surfaces 1B21-1B24. These bottom connecting pieces 1B31-1B34 have the same shape as the top connecting pieces 1A31-1A34.

[0013] Additionally, a folding line is provided between each of the bottom side surfaces 1B21-1B24 and the bottom connecting pieces 1B31-1B34. Additionally, each of the bottom connecting pieces 1B31-1B34 has a bottom folding line 1B31c-1B34c provided from each vertex of the bottom surface 1B10 that bisects the bottom connecting piece 1B31-1B34, and these bottom folding lines 1B31c-1B34c divide each of the bottom connecting pieces 1B31-1B34 into two regions.

[0014] Next, the bottom sheet 1B has a bottom fixing portion 1B40 consisting of a heat seal area for fixing to the top sheet 1A outside the rectangular portion formed by the bottom side surfaces 1B21 to 1B24 and the bottom connecting pieces 1B31 to 1B34.

[0015] The top sheet 1A and the bottom sheet 1B are then aligned and stacked, and the two fixing portions 1A40, 1B40 are heat-sealed together to produce a flat paper container 11 (see Figure 4). The paper container 1 can be packed and transported in this flat state and supplied to a process of filling and sealing the contents. Note that even when this paper container 1 is flat, the spout 1C protrudes outward.

[0016] In order to transform the flat paper container 11 into a box-shaped state, the top sheet 1A and the bottom sheet 1B are each folded along the folding lines to form an upright shape.

[0017] 5 shows the intermediate product 12 thus transformed into a box-like shape. In the box-like intermediate product 12 thus formed, the top-side connecting pieces 1A31-1A34 and the bottom-side connecting pieces 1B31-1B34 are folded in half so that the central top-side folding lines 1A31c-1A34c and the central bottom-side folding lines 1B31c-1B34c form mountain folds toward the outer surface of the container. This folding causes the edges of the top-side side surfaces 1A21-1A24 of the top-side sheet 1A that form adjacent sides to overlap, and also causes the two regions separated by the top-side folding lines 1A31c-1A34c to overlap each other, thereby forming the top side of the fin-like panel. 2, top-side connecting piece 1A33 will be described. By folding top-side connecting piece 1A33 in half along top-side folding line 1A33c, sides 1A23b of top-side side surface 1A23 and 1A24b of top-side side surface 1A24, which are located on either side of top-side connecting piece 1A33, overlap each other. Furthermore, two regions 1A331 and 1A332 separated by top-side folding line 1A33c overlap each other to form the top sides of fin-like panels that protrude outward from each corner of intermediate product 12.

[0018] Incidentally, in a flat paper container 11, 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 overlap precisely, and the top-side bifold line 1A33c and the bottom-side bifold line 1B33c also overlap precisely with each other, so that when the top-side connecting piece 1A33 of the top-side sheet 1A is folded in half along the top-side bifold line 1A33c, the bottom-side connecting piece 1B33 of the bottom-side sheet 1B is also folded in half along the bottom-side bifold line 1B33c. As a result, the edges 1B23b of the bottom side surface 1B23 and the edges 1B24b of the bottom side surface 1B24 located on both sides of the bottom side connecting piece 1B33 also overlap with each other, and the two areas separated by the bottom side folding line 1B33c also overlap with each other, forming fin-shaped panels 133 that protrude outward from each corner of the intermediate product 12.

[0019] The top side surface 1A23 of the top sheet 1A and the bottom side surface 1B23 of the bottom sheet 1B are continuous via the container fixing portion 140, so that the side surfaces 1A23, 1B23 form the side surface 123 of the box-shaped intermediate product 12.

[0020] Furthermore, because top-side connecting piece 1A33 of top-side sheet 1A and bottom-side connecting piece 1B33 of bottom-side sheet 1B are also continuous via container fixing portion 140, the portion formed by these two connecting pieces 1A33, 1B33 connects and closes the side surfaces. That is, side surface 123 formed by top-side side surface 1A23 and bottom-side side surface 1B23 and side surface 124 formed by top-side side surface 1A24 and bottom-side side surface 1B24 are connected and closed so that no gaps occur.

[0021] The above description has been given taking as an example the case where the portion formed by the top connecting piece 1A33 and the bottom connecting piece 1B33 is folded in half, but the same applies to the other connecting pieces.

[0022] By folding all of the connecting pieces 1A31-1A34, 1B31-1B34 in half in this way, each of the side surfaces 121-124 is formed, and the intermediate product 12 is folded along predetermined folding lines to form a box shape. Intermediate product 12 in this box shape has a top surface 1A10 and a bottom surface 1B10, with side surfaces 121-124 provided around them, and since connecting pieces 1A31-1A34, 1B31-1B34 close the spaces between the side surfaces 121-124, the intermediate product 12 is sealed except for the opening where spout 1C is attached.

[0023] In this state where the box-shaped structure is formed, the folded connecting pieces 1A31 to 1A34 and 1B31 to 1B34 are connected to the fin-shaped panel 131 as shown in FIG. -134, and these fin-like panels protrude outward from each corner of the intermediate product 12. The appearance can be improved by folding these fin-like panels 131-134 over the respective side surfaces 121-124 of the intermediate product 12 and then sealing and adhering them, for example. Figure 6 shows a paper container 1 manufactured by folding the fin-like panels 131-134 over the respective side surfaces 121-124 of the intermediate product 12 in this way.

[0024] As can be seen from the above explanation, by folding all of the top connecting pieces 1A31-1A34 and bottom connecting pieces 1B31-1B34 of the flat paper container 11 in half along these folding lines 1A31c-1A34c and 1B31c-1B34c, and folding the fin-shaped panels 131-134 onto each side 121-124 of the intermediate product 12, the paper container 1 can be transformed into a box-shaped paper container 1.

[0025] It is also possible to press in all of the top side surfaces 1A21-1A24 and bottom side surfaces 1B21-1B24 of the flat paper container 11 from the outside, and then fold the fin-like panels 131-134 onto the side surfaces 121-124 of the intermediate product 12, thereby transforming the paper container 1 into a box-shaped paper container 1. When pressing in the side surfaces 1A21-1A24, 1B21-1B24, a jig can be used, for example.

[0026] Regardless of the method used to create the box-shaped state, this paper container 1 has a shape as shown in Fig. 6. The container fixing part formed by heat-sealing the top fixing part 1A40 and the bottom fixing part 1B40 is laid down on the outer surface of either the top side surfaces 1A21-1A24 or the bottom side surfaces 1B21-1B24, and overlaps that outer surface (in Fig. 6, the container fixing part overlaps the outer surfaces of the bottom side surfaces 1B21-1B24).

[0027] The paper container 1 is then fed in a flat state to the process of filling and sealing the contents, and by deforming into a box-like shape, the contents can be filled through the spout and can be sealed with a cap.

[0028] After using this box-shaped paper container 1, it can be returned from the box-shaped state to a flat state when it is empty. For example, as described above, the flat paper container 11 is supplied to the content filling process, and in this process it is transformed into the box-shaped paper container 1, filled and sealed, and then transported and sold in this state. After that, when the consumer consumes the contents and the contents are emptied, it can be reduced in volume to the flat paper container 11 and stored or disposed of.

[0029] To deform the box-shaped paper container 1 into a flat state, the fin-like panels 131-134 are peeled off from the container side surfaces 121-124, and the container fixing part 140 is grasped and pulled outward from the paper container 1. By pulling the container fixing part 140 outward, the folded connecting pieces 131-134 open, and the paper container 1 is deformed into the flat paper container 11. [Prior art documents] [Patent documents]

[0030] [Patent Document 1] Japanese Patent Application Publication No. 2019-26275 Summary of the Invention [Problem to be solved by the invention]

[0031] In order for the above-mentioned paper container to maintain its shape when it is deformed into a box-like shape, the top sheet 1A and the bottom sheet 1B must be made of a relatively strong, shape-retaining, paper-based sheet. The fin-shaped panels 131-134 formed by folding such sheets in half must have sufficient adhesive strength between them and the container side surfaces 121-124 in order to be able to be folded down and bonded to the container side surfaces 121-124. If the adhesive strength is weak, the fin-shaped panels 131 to 134 will return and peel off from the container side surfaces 121 to 124.

[0032] On the other hand, if these fin-shaped panels 131-134 are sealed to the container side surfaces 121-124 with strong adhesive strength, there is a problem in that, for example, after the contents have been consumed, even if one tries to peel the fin-shaped panels 131-134 off the container side surfaces 121-124 and deform them into a flat state, the fin-shaped panels 131-134 cannot be easily peeled off.

[0033] Therefore, an object of the present invention is to provide a paper container that is in a box-like state as described above, and that can be transformed into a flat state by peeling off a fin-shaped panel from the side of the container, and that can be easily peeled off even if the fin-shaped panel is tightly sealed. [Means for solving the problem]

[0034] That is, the invention described in claim 1 is a paper container that is composed of a top sheet and a bottom sheet, which are mainly made of paper, and is configured by overlapping these top sheet and bottom sheet and sealing them together all around the periphery, and is transformed from a flat state into a box-shaped state, The top sheet has a polygonal top surface at its center, The polygonal top surface has a rectangular top side surface, and each side of the polygonal top surface is one side. The number of sides of the polygonal top surface is the same as the number of sides of the polygonal top surface. A top-side connecting piece is provided at each corner between adjacent top-side sides, connecting and closing the top-side sides, A top-side folding rule is provided so that the sides constituting the top-side side surfaces of the adjacent rectangular shapes coincide with each other, and the top-side folding rule is divided into two areas by the top-side folding rule. The top-side fixing portion is provided on the outer side of the top-side side surface and the top-side connecting piece to fix it to the bottom-side sheet, The bottom sheet has a polygonal bottom surface at its center, The number of rectangular bottom side surfaces, each of which has one side of the polygonal bottom surface as one side, is the same as the number of sides of the polygonal bottom surface, A bottom-side connecting piece is provided at each corner between adjacent bottom-side surfaces to connect and close the bottom-side surfaces, a bottom-side folding line is provided along which the bottom-side connecting piece can be folded in half so that the sides constituting the bottom side surfaces of the adjacent rectangular shapes coincide with each other, and the bottom-side folding line divides the bottom-side connecting piece into two regions; The bottom side fixing portion is provided on the outside of the bottom side surface and the bottom side connecting piece to fix it to the top side sheet, The top sheet and the bottom sheet are stacked together, and the top fixing portion and the bottom fixing portion are sealed together to form a fixing portion. The top-side connecting piece at each corner and the top-side fixing part in the area located outside thereof are folded in half along the top-side folding line, and the two areas that make up this top-side connecting piece are overlapped together, and the bottom-side connecting piece at each corner and the bottom-side fixing part in the area located outside thereof are folded in half along the bottom-side folding line, and the two areas that make up this bottom-side connecting piece are overlapped together, thereby deforming the paper container into a box-like shape, and these top-side connecting pieces and their outer top-side fixing parts, and the bottom-side connecting pieces and their outer bottom-side fixing parts, together form fin-like panels that protrude from each corner of the paper container towards the outside of the paper container, and the top-side side surface and the bottom-side side surface that is continuous with it form the side surface of the container, The fin-shaped panel is folded down onto the side surface of the container and sealed with a part thereof, A gap is provided between the fin panel and the side of the container so that a finger can be inserted. And, The gap is formed by bending the fin panel relative to the side surface of the container. It is a paper container characterized by the following.

[0035] The gap between the fin panel and the side surface of the container is preferably 1.5 mm or more, and more preferably 2.0 mm or more. [Effects of the Invention]

[0036] According to the present invention, a gap is provided between the fin panel and the side surface of the container, allowing a finger to be inserted therein. Therefore, even if the fin panel is tightly sealed to the side surface of the container, it can be easily peeled off by inserting a finger into the gap and pulling it up with the finger. [Brief explanation of the drawings]

[0037] [Figure 1] FIG. 1 relates to a specific example of a paper container of the present invention, and FIG. 1(a) is a perspective view of the paper container, and FIG. 1(b) is a cross-sectional view of a main part for explanation. [Figure 2] FIG. 2 is a plan view of the top sheet of the paper container. [Figure 3] FIG. 3 is a plan view of the bottom sheet of the paper container. [Figure 4] FIG. 4 is a cross-sectional view of a paper container in a flat state. [Figure 5] FIG. 5 is a perspective view of an intermediate product (intermediate container) in the process of transforming a flat paper container into a box-shaped one. [Figure 6] FIG. 6 is a perspective view of a paper container. DETAILED DESCRIPTION OF THE INVENTION

[0038] The paper container of the present invention is similar to a conventional paper container 1, except that a gap is provided between the fin panel and the side surface of the container so that a finger can be inserted, and the manufacturing process is also similar. Therefore, a description of the paper container will be omitted except for an explanation of the gap. Figure 1(a) is a perspective view of the paper container 1 to explain the gap, and Figure 1(b) is a cross-sectional view of the main part taken along line XX in Figure 1(a) for explanation.

[0039] As shown in the figure, this paper container 1 has two fin-shaped panels sealed to the container side surface 121, which is made up of a top side surface 1A21 and a bottom side surface 1B21. One of the fin-shaped panels is fin-shaped panel 131, which is made up of a top connecting piece 1A31 and a bottom connecting piece 1B31. The other is fin-shaped panel 134, which is made up of a top connecting piece 1A34 and a bottom connecting piece 1B34.

[0040] First, the fin-shaped panel 131 is folded down toward the container side surface 121 and sealed. The fin-shaped panel 131 is sealed to the container side surface 121 at its tip, and within the sealed area, the lower area of ​​the fin-shaped panel 131 is indicated by the symbol "β".

[0041] Next, fin panel 134 is folded over and sealed at its tip onto fin panel 131 thus sealed. As can be seen from the drawing, this fin panel 134 is sealed to fin panel 131. However, in addition to this, fin panel 134 may also be sealed to the container side surface 121 in the vicinity thereof.

[0042] The fin-shaped panel 131 is bent as shown in Figure 1(b) due to the stiffness of the sheet that constitutes it. This bending creates a roughly crescent-shaped gap between the fin-shaped panel 131 and the container side surface 121. If this gap is wide enough to allow a finger to be inserted between the fin-shaped panel 131 and the container side surface 121, the container 1 can be easily deformed into a flat state by inserting a finger therein and peeling it away.

[0043] In this way, in order to insert a finger between the fin panel 131 and the container side surface 121, the width d of this gap, that is, the distance between the fin panel 131 and the container side surface 121, is set to be the maximum The distance d is preferably 1.5 mm or more, and more preferably 2.0 mm or more.

[0044] As mentioned above, this gap originates from the stiffness of the sheets that make up the fin-shaped panel, so the width d of this gap varies depending on the material of the top side sheet 1A and the bottom side sheet 1B, the position of the sealing area, or the fold lines provided on these top side sheet 1A and bottom side sheet 1B.

[0045] Generally, the greater the stiffness of the sheets constituting the top sheet 1A and the bottom sheet 1B, the greater the gap width d.

[0046] Furthermore, when the intersection point α is the lower edge of the fin-shaped panel 131 sealed to the container side surface 121, i.e., the edge 1A41x of the top-side fixing part 1A41 on the outer side of the top-side side surface 1A21, and the bottom double-folded crease 1B31c, the longer the distance (α-β distance) between the lower edge of the sealing area β of the fin-shaped panel 131 and this point α, the larger the gap width d becomes. If the lower edge of the fin-shaped panel 131 were not sealed to the container side surface 121, the gap width d would be even larger. [Example]

[0047] The present invention will be described below with reference to examples. In the following examples and comparative examples, the top sheet 1A and the bottom sheet 1B are made of low-density polyethylene (thickness: 25 μm), paper (basis weight: 250 g / m), in that order from the outer surface of the container. 2 ), low-density polyethylene (thickness 25 μm), aluminum foil (thickness 7 μm), polyester film (thickness 12 μm), and linear low-density polyethylene (thickness 60 μm) are laminated together.

[0048] Example 1 The top sheet 1A used was the one shown in Figure 2, and the bottom sheet 1B used was the one shown in Figure 3. These were then sealed together at fixing parts 1A40 and 1B40 to produce a flat paper container 11 (see Figure 4).

[0049] Next, a box-shaped intermediate product 12 was produced while blowing air through the spout 1C (see FIG. 5).

[0050] Finally, the four fin-shaped panels 131 to 134 were folded down and sealed to the container side surfaces 121 to 124 to produce the paper container 1 (see FIG. 1). As shown in FIG. 1, after the fin-shaped panel 131 was sealed to the container side surface 121, the fin-shaped panel 134 was folded down so as to overlap the fin-shaped panel 131 and sealed.

[0051] When the intersection of the edge 1A41x of the top fixing part 1A41 on the outer side of the top side surface 1A21 and the bottom folding line 1B31c ​​is defined as point α, the distance between the lower end of the sealing area β of the fin panel 131 and point α (α-β distance) is 19 mm. A roughly crescent-shaped gap is formed between the fin panel 131 and the container side surface 121, and its maximum width d is 1.5 mm.

[0052] Example 2 A paper container 1 was produced in the same manner as in Example 1, but the fin-shaped panel 131 was only sealed to the container side surface 121 at its tip, and the lower edge of the fin-shaped panel 131 was not sealed to the container side surface 121.

[0053] In the obtained paper container 1, the maximum width d of the gap between the fin-like panel 131 and the container side surface 121 was 3.0 mm.

[0054] (Comparative Example) A paper container 1 was produced in the same manner as in Example 1, except that the α-β distance was set to 8 mm. The maximum width d of the gap between the fin-like panel 131 and the container side surface 121 was 1.0 mm.

[0055] (evaluation) Ten panelists evaluated the fin-like panels of the paper containers of Examples 1 and 2 and the Comparative Example. The ten panelists unanimously rated that the paper container of Example 2 was the easiest to peel off, followed by the paper container of Example 1. The paper container of the Comparative Example was also unanimously rated as the most difficult to peel off by all ten panelists. [Explanation of symbols]

[0056] 1: Paper containers 1A: Top seat 1A10: Top 1A21~1A24: Top side 1A31~1A34: Top connecting piece 1A31c~1A34c: Ruled lines for folding the top half 1A40: Top side fixed part 1A41: Top-side fixing portion on the outer side of the top-side side 1A21 1A41x: Edge of the top-side fixing portion 1A41 1B: Bottom sheet 1B10: Bottom 1B21~1B24: Bottom side 1B31~1B34: Bottom connecting piece 1B31c~1B34c: Bottom folding lines 1B40: Bottom side fixed part 1C: Spout 11: Flat paper container 12: Intermediate products 121~124: Container side 131~134: Fin-shaped panels 140: Container fixing part α: Intersection of the edge 1A41x of the top fixing part 1A41 on the outer side of the top side surface 1A21 and the bottom folding line 1B31c β: The area under the fin panel in the sealing area

Claims

1. A paper container that is made up of a top sheet and a bottom sheet, mainly made of paper, and that is configured by overlapping these top sheet and bottom sheet and sealing them together all around the periphery, and that is transformed from a flat state into a box-shaped state, The top sheet has a polygonal top surface at its center, The polygonal top surface has a rectangular top side surface, and each side of the polygonal top surface is one side. The number of sides of the polygonal top surface is the same as the number of sides of the polygonal top surface. A top-side connecting piece is provided at each corner between adjacent top-side sides, connecting and closing the top-side sides, A top-side folding rule is provided so that the sides constituting the top-side side surfaces of the adjacent rectangular shapes coincide with each other, and the top-side folding rule is divided into two areas by the top-side folding rule. The top-side fixing portion is provided on the outer side of the top-side side surface and the top-side connecting piece to fix it to the bottom-side sheet, The bottom sheet has a polygonal bottom surface at its center, The number of rectangular bottom side surfaces, each of which has one side of the polygonal bottom surface as one side, is the same as the number of sides of the polygonal bottom surface, A bottom-side connecting piece is provided at each corner between adjacent bottom-side surfaces to connect and close the bottom-side surfaces, a bottom-side folding line is provided along which the bottom-side connecting piece can be folded in half so that the sides constituting the bottom side surfaces of the adjacent rectangular shapes coincide with each other, and the bottom-side folding line divides the bottom-side connecting piece into two regions; The bottom side fixing portion is provided on the outside of the bottom side surface and the bottom side connecting piece to fix it to the top side sheet, The top sheet and the bottom sheet are stacked together, and the top fixing portion and the bottom fixing portion are sealed together to form a fixing portion. The top-side connecting piece at each corner and the top-side fixing part in the area located outside thereof are folded in half along the top-side folding line, and the two areas that make up this top-side connecting piece are overlapped together, and the bottom-side connecting piece at each corner and the bottom-side fixing part in the area located outside thereof are folded in half along the bottom-side folding line, and the two areas that make up this bottom-side connecting piece are overlapped together, thereby deforming the paper container into a box-like shape, and these top-side connecting pieces and their outer top-side fixing parts, and the bottom-side connecting pieces and their outer bottom-side fixing parts, together form fin-like panels that protrude from each corner of the paper container towards the outside of the paper container, and the top-side side surface and the bottom-side side surface that is continuous with it form the side surface of the container, The fin-shaped panel is folded down onto the side surface of the container and sealed with a part thereof, A gap is provided between the fin panel and the side of the container so that a finger can be inserted, The paper container characterized in that the gap is formed by bending the fin-shaped panel against the side surface of the container.

2. 2. The paper container according to claim 1, wherein the gap between the fin panel and the side surface of the container is 1.5 mm or more.

3. 2. The paper container according to claim 1, wherein the gap between the fin panel and the side surface of the container is 2.0 mm or more.

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