JP3223605U - Box sheet - Google Patents

Abstract

The present invention provides a box sheet that can stably hold papers such as newspapers and can be assembled into a box body in which stacked papers can be easily bundled. A pair of long surface panels and a pair of width surface panels 2a and 2b, which are alternately connected in the left-right direction and assembled into a rectangular cylindrical body, and a pair of long surface panels 1a and 1b and a pair of width surface panels. A box sheet that extends from at least one lower edge and has a bottom-forming flap that can seal a lower opening of a rectangular cylindrical body, and can be assembled into a tray-like box that can be stacked and accommodated. Thus, the pair of long face panels and the pair of width face panels are defined by a pair of easy break lines 11 and 16 extending downward from the upper edge and easy bend lines connecting the lower ends of these easy break lines. In addition, it has folding pieces 13 and 18 that are folded so as to be folded on the inner surface, and has a cut 15 in at least one upper edge other than the folding pieces of the pair of long surface panels and the pair of width surface panels. [Selection] Figure 1

Description

  The present invention relates to a box sheet.

  A tray-like box formed by assembling paper sheets is used as a case for stacking and storing papers such as newspapers. As this sheet, a sheet having a rectangular bottom panel, a front panel extending from a side edge of the bottom panel, a back panel, and a pair of side panels has been proposed (see JP 2002-37239 A). ).

  The said sheet | seat has a tongue-like insertion piece in the both sides of the said front panel and back panel. Moreover, the said sheet | seat has the flap extended from the both-sides edge of a pair of side panel, The insertion hole into which the said insertion piece is inserted is formed in this flap. In the box described in the above publication, the side panel is formed by raising the front panel, the back panel, and the pair of side panels from the bottom panel, and inserting the insertion piece into the insertion hole. Further, the box has a string insertion hole for inserting a binding string at the upper part of the front panel, the rear panel and the pair of side panels.

JP 2002-37239 A

  The box described in the above publication has a side wall formed by a front panel, a rear panel, and a pair of side panels raised from a bottom panel. Force is easily applied in the direction of expanding the side wall. Also, when paper such as newspaper is stacked in the box body, there is a high risk that the paper will collapse in the left-right direction as the number of stacked sheets increases, and this collapse of the paper pushes the side wall of the box in the unfolding direction. Acts as a force. Furthermore, in this box body, when the force is applied in the direction in which the side wall is developed, the insertion piece is easily removed from the insertion hole. In addition, this box is made to pass the binding string through the string insertion hole before stacking the paper, and when binding the stacked paper, the binding string is pulled out from the string insertion hole. Therefore, it takes time and effort to bind paper.

  The present invention has been made in view of such inconveniences, and is capable of stably holding paper such as newspaper, and is a box sheet that can be assembled into a box that can easily bundle stacked paper. Offering is an issue.

  A box sheet according to the present invention made to solve the above-mentioned problems is composed of a pair of long surface panels and a pair of width surfaces which are composed of a single sheet and are alternately connected in the left-right direction and assembled into a rectangular cylindrical body. A panel and a bottom forming flap that extends from at least one lower edge of the pair of long surface panels and the pair of width surface panels and seals a lower opening of the rectangular cylindrical body, and stacks papers A pair of easy-to-break lines that extend downward from the upper edge, and the pair of long surface panels and the pair of width surface panels. The folding of the pair of long surface panels and the pair of width surface panels has a folding piece that is defined by an easy folding line that connects the lower ends of the easy breaking lines and is folded to overlap the inner surface. At least one upper edge of the other, with a temporary fixing can cut a cord for tying the Paper.

  The box sheet according to the present invention can stably hold paper such as newspaper, and can be assembled into a box that allows easy stacking of stacked paper.

FIG. 1 is a schematic plan view showing a box sheet according to an embodiment of the present invention. FIG. 2 is a schematic perspective view showing a box formed by assembling the box sheet of FIG. FIG. 3 is a schematic perspective view showing a state before the paper is accommodated in which the string is temporarily fixed to the cut in the box shown in FIG. 2. FIG. 4 is a schematic plan view of the box of FIG. FIG. 5 is a schematic perspective view showing a state in which papers housed in the box of FIG. 3 are bound with a string. FIG. 6 is a schematic partial enlarged view showing the cutting of the box sheet in FIG. 1.

[Description of Embodiment of the Invention]
First, embodiments of the present invention will be listed and described.

  The box sheet according to the present invention comprises a pair of long surface panels and a pair of width surface panels which are composed of a single sheet and are alternately connected in the left-right direction and assembled into a rectangular cylindrical body, and the pair of long surfaces. A tray-like box that includes a bottom forming flap that extends from at least one lower edge of the panel and the pair of width surface panels and that can seal a lower opening of the rectangular cylindrical body, and can stack and store papers The pair of long face panels and the pair of width face panels connect a pair of easy break lines extending downward from the upper edge and the lower ends of these break easy lines. A folding piece that is defined by a folding easy line and is folded to overlap the inner surface, and at least one upper edge of the pair of long surface panels and the pair of width surface panels other than the folding pieces, The string to tie the serial Paper has a temporary stop can be cut.

  Since the recesses are formed in the pair of long surface panels and the pair of width surface panels by folding the folding pieces, the box sheet can be easily accommodated in the box while appropriately stacking paper. In addition, the box sheet has a pair of long surface panels and a pair of width surface panels that are alternately connected in the left-right direction, and is assembled into a rectangular cylindrical body. Therefore, the pair of long surface panels and the pair of width surface panels Thus, the paper can be stably supported from the outside. Therefore, the box sheet can stably hold paper in the box. The box sheet can temporarily fix a string for binding papers to a notch formed in at least one upper edge of the pair of long side panels and the pair of wide side panels. It can be done easily.

  The notches may be formed at upper edges on both sides of the pair of long surface panels with the folded pieces interposed therebetween. In this way, the notches are formed at the upper edges of both sides of the pair of long face panels sandwiching the folded piece, thereby easily binding the papers while adjusting the length of the string. be able to.

  A string introducing portion in which the cut is reduced from above to below, a substantially circular first holding portion provided below the string introducing portion, and a slit-like second holding portion extending downward from the first holding portion. It is good to have. As described above, the incision has a string-introducing portion that is reduced in width from above, a substantially circular first holding portion that is provided below the string-introducing portion, and a slit-like shape that extends downward from the first holding portion. By having the second holding part, the string can be easily and appropriately temporarily fixed.

  It is preferable that another cut is formed at the bottom of the recess formed in the pair of long surface panels and the pair of width surface panels by bending the folding pieces. In this manner, the cords are more appropriately temporarily secured by forming other cuts at the bottoms of the recesses formed in the pair of long surface panels and the pair of width surface panels by bending the folding pieces. be able to.

  A connecting portion in which the folded piece is folded in parallel with the bottom forming flap; and a folded portion that is continuous from the connecting portion and is folded on the inner surface of the length panel or the width panel having the folded piece. Preferably, the folded portion has a convex portion on the tip side, and the bottom forming flap has a locking hole into which the convex portion is inserted. In this way, the folding piece is folded in parallel with the bottom forming flap and the connecting portion that is continuous from the connecting portion and folded on the inner surface of the length panel or the width panel having the folding piece. And the folded portion has a convex portion on the tip side, and the bottom forming flap has a locking hole into which the convex portion is inserted, thereby stabilizing the shape of the box body, The handleability of this box can be improved.

  In the present invention, the “left-right direction” means the horizontal direction in the assumed general usage of the box formed by assembling the sheet for the box, and “up” means the assumed general The upper in the usage mode means “lower” means the lower in the assumed general usage mode. “Inside” means the inside of the box. The “substantially circular” is not limited to a circle in a strict sense, and includes, for example, a shape approximated to a circle by a plurality of lines.

[Details of the embodiment of the present invention]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.

[Box sheet]
The box sheet in FIG. 1 is composed of one sheet. The box sheet can be assembled into a tray-like box that can be stacked and accommodated, and specifically, can be assembled into the box 30 of FIG. The box sheets are alternately connected in the left-right direction, and are assembled into a pair of long surface panels 1a, 1b and a pair of width surface panels 2a, 2b, and a pair of long surface panels 1a, 1b. A pair of bottom outer flaps 3a, 3b extending from the lower edge and a pair of bottom flaps 4a, 4b extending from the lower edge of the pair of width surface panels 2a, 2b are provided. The pair of bottom outer flaps 3 a and 3 b and the pair of bottom inner flaps 4 a and 4 b are bottom forming flaps that constitute the bottom of the box 30. The box sheet is provided with a glue margin 5 connected to a side edge opposite to the side connected to the width surface panel 2a of the length surface panel 1a arranged on the outer side in the left-right direction. In FIG. 1, a thick solid line indicates a cutting line formed by cutting the sheet, and a thin solid line indicates a ruled line formed by pushing the inner surface of the sheet.

  The box sheet has an adhesive margin 5 attached to the inner surface opposite to the side connected to the length surface panel 1b of the width surface panel 2b arranged on the outer side in the left-right direction, and a pair of length surface panels 1a, 1b and a pair of width surface panels 2a, 2b are assembled into a rectangular cylindrical body, a pair of inner bottom flaps 4a, 4b are folded inward, and a pair of outer bottom flaps 3a, 3b are attached to each other so that their tips are brought together. It is assembled into a tray shape by bending it into two. Adhesion of the adhesive margin 5 to the width surface panel 2b can be performed using, for example, an adhesive or a stapler. For example, a sealing tape X is attached to the butted portion of the pair of bottom outer flaps 3a and 3b.

  The sheet used for the box sheet is not particularly limited as long as it has a strength sufficient to maintain the shape of the box 30 formed by assembling the box sheet. For example, paper such as corrugated cardboard or cardboard Examples thereof include a sheet made of synthetic resin, a sheet made of synthetic resin, and a laminated sheet of a paper sheet and a synthetic resin sheet. Among them, a paper sheet is preferable from the viewpoint of processability, impact absorbability, handleability, recyclability, economy, and the like, and a corrugated cardboard sheet that is low in manufacturing cost and easy to assemble into the box 30 is particularly preferable. The corrugated cardboard forming the box sheet is obtained by bonding a core formed of a base paper into a corrugated shape to a liner, for example, a single side in which the core formed in a corrugated shape is bonded to a single liner Corrugated cardboard sheet, double-sided corrugated sheet with double-sided cardboard sheet, double-sided cardboard sheet with single-sided corrugated sheet sheet laminated to one side of double-sided cardboard sheet, single-sided corrugated cardboard sheet with single-sided corrugated sheet A double-sided corrugated cardboard sheet in which the tops of the sheets are further bonded together can be used. Among these, double-sided cardboard sheets are preferable from the viewpoint of processability, economy, durability, and the like.

(Length surface panel)
The pair of long surface panels 1a and 1b are formed in a rectangular shape and substantially the same shape. The length in the left-right direction of the length surface panels 1a, 1b is larger than the length in the left-right direction of the width surface panels 2a, 2b. The length in the left-right direction of the long surface panels 1a and 1b can be set as appropriate based on the size of the paper accommodated in the box 30. For example, when the paper is newspaper, it is 28 cm. It can be about 35 cm or less.

  The vertical lengths of the length surface panels 1a and 1b are substantially equal to the vertical length of the width surface panels 2a and 2b. The vertical length of the long surface panels 1a and 1b can be set to about 20 cm to 40 cm, for example.

  The pair of long surface panels 1a, 1b is defined by a pair of easy breakable lines 11 extending downward from the upper edge and a first easy breakable line 12 connecting the lower ends of the pair of easy breakable lines 11, It has the folding piece 13 bent so that it may fold over. As shown in FIG. 2, in the box body 30, a recess 31 is formed in the pair of long surface panels 1 a and 1 b by folding the folding piece 13.

  The folded piece 13 is connected to the pair of outer bottom flaps 3a, 3b and the pair of bottom inner flaps 4a, 4b in a state assembled to the box body 30, and is continuous from the connecting section 13a. 13 and a folded portion 13b that is folded on the inner surface of the long surface panels 1a and 1b. A second easy-bending line 14 is formed at the boundary line between the connecting portion 13a and the folded portion 13b. In other words, the folding piece 13 includes a connecting portion 13a defined by the first fold easy line 12 and the second fold easy line 14 and a folded portion 13b having the second fold easy line 14 as a base end. The folded portion 13b has a convex portion 13c that can be inserted into a later-described locking hole 20 on the distal end side.

  As shown in FIG. 3 and FIG. 4, a notch 15 capable of temporarily fixing a string S for binding papers is formed on the upper edge of the pair of long surface panels 1 a and 1 b other than the folding pieces 13. Yes. More specifically, one incision 15 is formed on each upper edge on both sides of the folding pieces 13 of the pair of long surface panels 1a and 1b. Thereby, the said sheet | seat for boxes can bind the said papers easily, adjusting the length of the string S. FIG. Specifically, as shown in FIG. 4, the box sheet is formed by bending two strings S into L-shapes and engaging them at the center of the bottom of the box 30, and connecting each string S to the length panel 1 a, It is used in a state where it is pulled out from the 1b side and the width surface panels 2a and 2b and the end portions of the strings S are temporarily fixed to the notches 15 formed on the upper edges of the length surface panels 1a and 1b. That is, each string S is pulled out from the length surface panels 1a and 1b and the width surface panels 2a and 2b, and the end of each string S is temporarily fixed to the notch 15 formed at the upper edge of the length surface panels 1a and 1b. In this state, papers are stacked on the bottom of the box 30. At this time, in order to bind the papers P stacked in the box 30 as shown in FIG. 5, the length of the portion of the string S drawn from the side of the width panel 2a, 2b is the length of the paper P. It is preferable that it is larger than the length of the part pulled out from the length surface panel 1a, 1b side so that it can bind in a length direction. In this regard, when the notch 15 is formed at the upper edge of the pair of long surface panels 1a and 1b, the portion drawn from the side of the width surface panels 2a and 2b passes through the outside of the width surface panels 2a and 2b. Since the panel is temporarily fixed to the panels 1a and 1b, the length of the portion pulled out from the width surface panels 2a and 2b tends to be larger than the length of the portion pulled out from the length surface panels 1a and 1b. As a result, the box sheet can automatically adjust the relative lengths on both sides of the occlusal portion Q of the string S so that the paper P can be easily bound, and the paper P can be easily bound.

  As shown in FIG. 6, the notch 15 includes a string introducing portion 15a that is reduced in width from above, a substantially circular first holding portion 15b that is provided below the string introducing portion 15a, and a lower portion from the first holding portion 15b. And a slit-like second holding portion 15c extending in the direction of the center. The box sheet can be easily inserted into and removed from the cut 15 by the cut 15 having the string introducing portion 15a. In addition, the box sheet can easily move the string S in the axial direction in the cut 15 by using the first holding portion 15b as a guide because the cut 15 has the first holding portion 15b. Further, the box sheet can easily temporarily fix the string S at a desired position because the notch 15 has the second holding portion 15c extending downward from the first holding portion 15b. Therefore, the box sheet can easily and reliably temporarily fix the string S at a desired position.

  The string introducing portion 15 a is provided at the proximal end portion of the cut 15. In other words, the string introducing portion 15 a constitutes the entrance of the cut 15. Specific examples of the shape of the string introducing portion 15a include a V shape, an arc shape, a U shape, and the like, and a V shape that easily guides the string S toward the bottom is preferable.

  The 1st holding | maintenance part 15b is continuously provided in the bottom part of the string introduction part 15a. The average diameter of the first holding portion 15b can be approximately the same as the diameter of the string S. For example, the lower limit of the average diameter of the first holding portion 15b is preferably 2 mm, and more preferably 3 mm. On the other hand, as an upper limit of the average diameter of the 1st holding | maintenance part 15b, 7 mm is preferable and 5 mm is more preferable. If the average diameter is less than the lower limit, it may be difficult to move the string S in the first holding portion 15b in the axial direction. Conversely, if the average diameter exceeds the upper limit, it may be difficult to guide the string S by the first holding portion 15b.

  The second holding portion 15c is formed by a cutting line that continuously extends downward from the first holding portion 15b. The second holding portion 15c preferably extends vertically downward from the lower end portion of the first holding portion 15b. The length of the second holding portion 15c can be set to about 5 mm or more and 20 mm or less, for example.

  The pair of long surface panels 1 a and 1 b have another cut 32 at the bottom 31 a of the recess 31 formed by bending the folding piece 13. The box sheet is formed by guiding the string S drawn from the pair of long surface panels 1a and 1b by the notch 32, or temporarily fixing the string S to the notch 32, so that two pieces on the bottom of the box 30 can be obtained. The occlusal state of the string S can be stably maintained. The specific shape of the cut 32 formed in the recess 31 can be the same as the cut 15 described above formed at the upper edges of the pair of long surface panels 1a and 1b.

(Width panel)
The pair of width surface panels 2a and 2b are formed in a rectangular shape and substantially the same shape. The length in the left-right direction of the pair of width panels 2a and 2b can be appropriately set based on the size of the paper accommodated in the box 30. For example, when the paper is newspaper, the length is 21 cm. It can be about 28 cm or less.

  The pair of width surface panels 2a, 2b is defined by a pair of easy break lines 16 extending downward from the upper edge and a first easy break line 17 connecting the lower ends of the pair of easy break lines 16, and folds on the inner surface. It has the folding piece 18 bent so that it may be bent. As shown in FIG. 2, in the box 30, a recess 33 is formed in the pair of width surface panels 2 a and 2 b by folding the folding piece 18.

  The folded piece 18 is connected to the pair of outer bottom flaps 3a, 3b and the pair of bottom inner flaps 4a, 4b in a state assembled to the box body 30, and is continuous from the connecting section 18a. 18 and a folded portion 18b that is folded on the inner surface of the width surface panels 2a and 2b. A second easy-to-bend line 19 is formed at the boundary line between the connecting portion 18a and the folded portion 18b. The folded portion 18b has a convex portion 18c that can be inserted into a later-described locking hole 21 on the distal end side.

  As shown in FIG. 2, the pair of width surface panels 2 a and 2 b have a cut 34 at the bottom 33 a of the recess 33 formed by folding the folding piece 18. The box sheet has two strings S on the bottom of the box 30 by guiding or temporarily fixing the string S drawn from the pair of width surface panels 2a and 2b side by the notch 34. The occlusal state of can be stably maintained. The specific shape of the cut 34 formed in the recess 33 can be the same as the above-described cut 15 formed at the upper edges of the pair of long surface panels 1a and 1b.

(Outside bottom flap)
The pair of outer bottom flaps 3a and 3b are formed in a rectangular shape and substantially the same shape. The width of the outer bottom flaps 3a and 3b is substantially the same as the length in the left-right direction of the length surface panels 1a and 1b. The length in the extending direction of the outer bottom flaps 3a, 3b is approximately ½ of the length in the left-right direction of the width surface panels 2a, 2b.

  The outer bottom flaps 3a and 3b have locking holes 20 extending in the width direction with the boundary line with the length surface panels 1a and 1b as the base ends. The protrusion 13c of the folding piece 13 that is folded back to the inner surface side of the length surface panels 1a and 1b is inserted into the locking hole 20.

(Flap in the bottom)
The pair of bottom flaps 4a and 4b are formed in a rectangular shape and substantially the same shape. The widths of the bottom flaps 4a and 4b are substantially the same as the lengths of the width panels 2a and 2b in the left-right direction. The length in the extending direction of the bottom inner flaps 4a and 4b is substantially the same as the length in the extending direction of the outer bottom flaps 3a and 3b.

  The bottom inner flaps 4a and 4b have locking holes 21 extending in the width direction with the boundary line with the width surface panels 2a and 2b as the base ends. The protrusion 18c of the folded piece 18 that is folded back to the inner surface side of the width panel 2a, 2b is inserted into the locking hole 21.

  The box sheet stabilizes the shape of the box body 30 and improves the handleability of the box body 30 by inserting the convex portions 13c and 18c of the folding pieces 13 and 18 into the locking holes 20 and 21. it can. Moreover, according to this structure, the said sheet | seat for boxes can guide the string S more easily and reliably by the notches 32 and 34 formed in the recessed parts 31 and 33 of the box 30.

<Advantages>
In the box sheet, the recesses 31 and 33 are formed in the pair of long surface panels 1a and 1b and the pair of width surface panels 2a and 2b by bending the folding pieces 13 and 18, so that the paper P is appropriately stacked. It can be easily accommodated in the box 30. Moreover, since the pair of long surface panels 1a and 1b and the pair of width surface panels 2a and 2b that are alternately connected in the left-right direction are assembled into a rectangular tubular body, the box sheet is assembled into a pair of long surface panels 1a. , 1b and the pair of width surface panels 2a, 2b can stably support the paper P from the outside. Therefore, the box sheet can stably hold the paper P in the box 30. Since the string for the box can temporarily fix the string S to the notch 15 formed at the upper edge of the pair of long surface panels 1a and 1b, the paper P can be easily bundled.

[Other Embodiments]
The said embodiment does not limit the structure of this invention. Therefore, in the above-described embodiment, components of each part of the above-described embodiment can be omitted, replaced, or added based on the description and common general knowledge of the present specification, and they are all interpreted as belonging to the scope of the present invention. Should.

  For example, the bottom of the box is not limited to a structure assembled by a pair of bottom outer flaps extending from the lower edges of the pair of long surface panels and a pair of bottom inner flaps extending from the lower edges of the pair of width surface panels. . In the box sheet, for example, a bottom forming flap extends from at least one lower edge of the pair of long surface panels and the pair of width surface panels, and the bottom forming flap seals a lower opening of the rectangular cylindrical body. It is sufficient if the bottom of the box can be formed.

  The box sheet may have the cuts formed on the upper edges of the pair of width surface panels instead of the cuts on the upper edges of the pair of length surface panels, and the pair of length surface panels and the pair of width surfaces. The incision may be formed on both upper edges of the panel. Moreover, even if it is formed in the upper edge of a pair of long surface panel, the said notch | incision may be formed only in one upper edge opposed across a folding piece.

  The incision includes a string introduction portion that contracts downward from above, a substantially circular first holding portion that is provided below the string introduction portion, and a slit-like second holding portion that extends downward from the first holding portion. It is not limited to the structure which has. For example, the slit may be a single slit.

  The box sheet does not necessarily have the above-mentioned cut formed in the concave portion of the box. Further, even when a notch is formed in the recess, the notch formed in the recess and the notches formed in the upper edges of the pair of long surface panels and the pair of width surface panels may not have the same shape. Good.

  The folding piece does not necessarily have the connection portion and the folding portion. Further, the folded piece may not have a convex portion on the tip side. In this case, the above-described bottom forming flap does not have to have a locking hole into which the convex portion is inserted.

  The number of strings used for binding paper in the box is not particularly limited.

  As described above, the box sheet according to the present invention is suitable for stacking and storing papers such as newspapers.

1a, 1b Long face panels 2a, 2b Wide face panels 3a, 3b Outer bottom flaps 4a, 4b Inner bottom flaps 5 Adhesive margins 11, 16 Easy break lines 12, 17 First bend easy lines 13, 18 Folding pieces 13a, 18a Connection Parts 13b, 18b Folded parts 13c, 18c Convex parts 14, 19 Second fold easy lines 15, 32, 34 Notch 15a String introduction part 15b First holding part 15c Second holding part 20, 21 Locking hole 30 Box 31 , 33 Recessed part 31a, 33a Bottom part P Papers Q Occlusion part S String X Sealing tape

Claims (5)

It consists of one sheet,
A pair of long surface panels and a pair of width surface panels that are alternately connected in the left-right direction and assembled into a rectangular tubular body;
A bottom forming flap that extends from at least one lower edge of the pair of long face panels and the pair of width face panels and that can seal the lower opening of the rectangular tubular body, and can stack and accommodate papers A box sheet that can be assembled into a tray-like box,
The pair of long face panels and the pair of width face panels are defined by a pair of easy break lines extending downward from the upper edge and an easy bend line connecting the lower ends of these break easy lines, It has a folded piece that can be folded so as to be folded,
The sheet | seat for boxes which has the notch which can temporarily fix the string for bundling the said papers in at least one upper edge other than the said folding piece of a pair of said length surface panel and a pair of said width surface panel.   The box sheet according to claim 1, wherein the cuts are formed at upper edges on both sides of the pair of long surface panels with the folded pieces interposed therebetween.   A string introducing portion in which the cut is reduced from above to below, a substantially circular first holding portion provided below the string introducing portion, and a slit-like second holding portion extending downward from the first holding portion. The sheet | seat for boxes of Claim 1 or Claim 2 which has these.   4. The box according to claim 1, wherein another notch is formed in a bottom portion of a concave portion formed in the pair of long surface panels and the pair of width surface panels by bending the folding piece. Sheet. A connecting portion in which the folded piece is folded in parallel with the bottom forming flap; and a folded portion that is continuous from the connecting portion and is folded on the inner surface of the length panel or the width panel having the folded piece. Have
The folded portion has a convex portion on the tip side,
The box sheet according to any one of claims 1 to 4, wherein the bottom forming flap has a locking hole into which the convex portion is inserted.

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