JP3215763U - Box sheet - Google Patents

Abstract

A box sheet capable of stably transporting an article is provided. A box sheet according to the present invention is connected to one side in the left-right direction from the other side, and is assembled into a rectangular tube shape, a first length surface panel 1, a first width surface panel 2, a second length surface. A panel 3 and a second width surface panel 4; and a pair of upper inner flaps 7 and 8 extending from upper edges of the first width surface panel 2 and the second width surface panel 4, and the first width surface panel 2 and the second width surface panel. 4 includes a pair of handle hole forming folding pieces 22, and a pair of upper inner flaps 7, 8 are assembled into a pair of reinforcing folding pieces 26 that are folded on the first width panel 2 and the second width panel 4. The pair of reinforcing folding pieces 26 includes a region overlapping with the handle hole forming folded piece 22 in the folded state, and has an opening 28 or a notch to which the handle hole forming folded piece 22 is engaged. [Selection] Figure 1

Description

  The present invention relates to a box sheet.

  Packaging boxes made by assembling box sheets composed of cardboard sheets or the like are widely used as packaging containers for articles. As such a packaging box, there is also a packaging box in which a handle hole is formed in order to improve the portability when carrying an article. As a packaging box in which such a handle hole is formed, for example, a “packaging box” (see JP2013-241216A) has been proposed.

  The packaging box described in the above publication has a pair of side walls having a bending line extending in the left-right direction and first cutting lines that are connected to both ends of the bending bending line and project downward. A handle hole can be formed by folding the line inward. Moreover, this packaging box has the 2nd cut line extended in the direction which cross | intersects the left-right direction above the said bending plan line.

JP2013-241216A

  In the packaging box described in the above publication, even if the weight of the article accommodated therein is heavy and the upper end of the handle hole is torn upward, the tear is stopped at the second cut line, so that it can be stably transported. ing. However, even if the tear of the side wall can be reset once by the second cut line, this packaging box is likely to be broken upward from the second cut line when the article is further conveyed. Therefore, according to this packaging box, it is difficult to stably convey the article.

  The present invention has been made in view of such inconveniences, and an object thereof is to provide a box sheet capable of stably transporting articles.

  The box sheet according to the present invention made to solve the above problems is connected to the other side from one side in the left-right direction, and is assembled into a rectangular tube shape, the first length surface panel, the first width surface panel, the second A length surface panel and a second width surface panel; a pair of upper outer flaps extending from upper edges of the first length surface panel and the second length surface panel; and the first width surface panel and the second width surface panel. A box sheet comprising a pair of upper inner flaps extending from an upper edge and capable of being assembled into a box shape, wherein the first width panel and the second width panel are downwardly protruding cutting lines or easy break lines A pair of folding holes for forming a handle hole defined by a first separation line, wherein the pair of upper inner flaps are located at both ends on the side of the connecting portion between the first width panel and the second width panel. From a cutting line or a breakable line A pair of reinforcing folding pieces defined by a second separation line and folded over the first width panel and the second width panel in an assembled state, the pair of reinforcing folding pieces being in the folded state; It includes an area that overlaps with the hole-forming folded piece, and has an opening or notch with which the handle hole-forming folded piece is engaged.

  The box sheet is formed by folding the reinforcing folded piece on the first width panel and the second width panel, and engaging the handle hole forming folded piece with an opening or a notch formed in the reinforcing folded piece. By doing so, the strength of the handle hole can be increased. Specifically, a handle can be formed in a double manner by the first width panel or the second width panel and the reinforcing folding piece, and a handle hole is formed at the lower end of the overlapping portion constituting the handle. By disposing the forming folded piece, it is possible to suppress tearing from the upper end of the handle hole. Therefore, according to the said sheet | seat for boxes, articles | goods can be conveyed stably.

  The first separation line has a pair of straight portions extending in the vertical direction and a connecting portion that connects lower ends of the straight portions, and an interval between the pair of straight portions is a distance between the reinforcing folding pieces. The width of the opening or notch corresponding to the pair of straight portions in the folded state is preferably larger, and the difference between the distance between the pair of straight portions and the width of the opening or notch is 1 mm or more and 15 mm. The following is preferred. Thus, the difference between the distance between the pair of straight portions and the width of the opening or notch is within the above range, so that the handle hole forming folded piece can be easily and reliably inserted into the opening or notch. In addition to being able to engage, this engaged state can be kept stable.

  It is preferable that the reinforcing folding piece has a reinforcing fold easy line that crosses the tip side in the left-right direction with respect to both ends of the second separation line. In this way, the reinforcing folding piece has the reinforcing folding easy line that crosses the distal end side in the left-right direction with respect to both ends of the second separation line, so that the reinforcing folding piece is connected to the first width surface panel and It can be easily folded on the second width panel.

  The first width panel and the second width panel have proximal fold easy lines connecting both ends of the first separation line, and the handle hole forming folded piece is below the proximal fold easy line. It is preferable to have an intermediate easy-to-bend line that crosses the sheet in the left-right direction, and the ratio of the distance between the proximal end easy-to-bend line and the intermediate easy-to-bend line to the sheet thickness is preferably 1.0 to 2.5. As described above, the first width panel and the second width panel have a base end fold easy line connecting between both ends of the first separation line, and the handle hole forming folding piece is the base end fold easy. An intermediate bendable line that crosses the lower side of the line in the left-right direction, and the ratio of the distance between the base end bendable line and the intermediate bendable line to the sheet thickness is within the above range. A portion of the forming folded piece on the front end side with respect to the intermediate folding easy line can be easily folded back to the surface side of the reinforcing folded piece opposite to the side facing the first width panel or the second width panel. Thus, the folded state of the reinforcing folding piece can be stably maintained.

  The intermediate folding easy line may be a lead ruled line in which a cutting line and a ruled line formed by pushing the inner surface of the first width panel or the second width panel alternately. As described above, the intermediate fold easy line is a lead ruled line in which a cutting line and a ruled line formed by pushing the inner surface of the first width panel or the second width panel are alternately continuous, When the reinforcing folded piece is folded on the inner surface side of the first width panel or the second width panel, the folded state can be maintained more stably.

  In the present invention, the “left-right direction” refers to the horizontal direction in the assumed general usage of a box formed by assembling box sheets, and “upper” and “lower” are assumed. It means up and down in a general usage mode. The “inner surface” means an inner surface in a box formed by assembling box sheets.

  As described above, the box sheet according to the present invention can stably transport articles.

It is a typical top view showing the sheet for boxes concerning one embodiment of the present invention. It is a typical perspective view which shows the box formed by assembling the sheet | seat for boxes of FIG. It is a typical partial enlarged view of the 1st width surface panel and upper side inner side flap of the box sheet | seat of FIG. It is a schematic diagram of the handle hole seen from the inner side of the box of FIG. It is typical sectional drawing of the handle hole of FIG.

  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 is connected from one side in the left-right direction to the other side, and is assembled into a rectangular tube shape. The first length face panel 1, the first width face panel 2, the second length face panel 3, and the second width face panel. 4, a pair of upper outer flaps 5, 6 extending from the upper edges of the first length face panel 1 and the second length face panel 3, and the upper edges of the first width face panel 2 and the second width face panel 4. A pair of upper inner flaps 7 and 8 are provided. The box sheet includes a pair of lower outer flaps 9 and 10 extending from the lower edges of the first length panel 1 and the second length panel 3, and the first width panel 2 and the second width surface. A pair of lower inner flaps 11, 12 extending from the lower edge of the panel 4 and an end edge of the first length surface panel 1 opposite to the connection side of the first width surface panel 2, the second width surface The adhesive margin part 13 stuck on the inner surface of the panel 4 is provided. The pair of upper outer flaps 5, 6 is a pair of the first length surface panel 1, the first width surface panel 2, the second length surface panel 3, and the second width surface panel 4 assembled in a square tube shape. After the upper inner flaps 7 and 8 are bent inward, the inner flaps are bent inward so that the tips are brought into contact with each other. The pair of lower outer flaps 9 and 10 are in a state in which the first length surface panel 1, the first width surface panel 2, the second length surface panel 3 and the second width surface panel 4 are assembled in a rectangular tube shape. After the pair of lower inner flaps 11 and 12 are folded inward, they are folded inward so that the tips are brought into contact with each other. For example, a sealing tape X is attached to the abutting portion of the pair of upper outer flaps 5 and 6 and the abutting portion of the pair of lower outer flaps 9 and 10, thereby sealing the upper opening and the lower opening of the box A. Stopped. Thereby, the said sheet | seat for boxes is assembled in the box A of A type | mold (citrus box type), as shown in FIG. 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 sheet used for the box sheet is not particularly limited as long as it has sufficient strength to maintain the shape of the box A formed by assembling the box sheet. For example, paper such as cardboard sheet or cardboard Examples thereof include a sheet made of synthetic resin, a sheet made of synthetic resin, a laminated sheet of a sheet made of paper and a sheet made of synthetic resin. Among them, a paper sheet is preferable from the viewpoint of processability, impact absorbability, handleability, recyclability, economy, and the like, and a cardboard sheet 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 cardboard sheet with a liner attached to the top of a single-sided cardboard sheet, double-sided cardboard sheet with a single-sided cardboard sheet laminated with one-sided cardboard sheet, single-sided cardboard on one side of a double-sided cardboard sheet A double-sided corrugated cardboard sheet in which the tops of the sheets are further bonded together can be used. In addition, the average thickness of the sheet used for the box sheet can be appropriately set according to the weight of the stored article, and can be set to, for example, 1.5 mm or more and 10 mm or less. In this case, the average thickness of the sheet can be, for example, 5 mm. When the sheet is a double-sided cardboard sheet, the average thickness of the sheet can be, for example, 8 mm.

(Length surface panel)
The first length surface panel 1 and the second length surface panel 3 are each formed in a substantially rectangular shape. The first length surface panel 1 and the second length surface panel 3 have substantially the same shape. Although it does not specifically limit as the left-right direction length of the 1st length surface panel 1 and the 2nd length surface panel 3, For example, it can be 30 cm or more and 100 cm or less. Although it does not specifically limit as a vertical direction length of the 1st length surface panel 1 and the 2nd length surface panel 3, For example, it can be 20 cm or more and 50 cm or less.

(Width panel)
The first width panel 2 and the second width panel 4 are each formed in a substantially rectangular shape. The first width panel 2 and the second width panel 4 have substantially the same shape. The left and right lengths of the first and second width panels 2 and 4 are smaller than the left and right lengths of the first and second length panels 1 and 3. As the left-right direction length of the 1st width surface panel 2 and the 2nd width surface panel 4, it can be 20 cm or more and 70 cm or less, for example. The vertical lengths of the first width panel 2 and the second width panel 4 are substantially equal to the vertical lengths of the first length panel 1 and the second length panel 3.

  The first width surface panel 2 and the second width surface panel 4 have a pair of hand-hole forming folding pieces 22 defined by a first separation line 21 made of a downwardly protruding cutting line or easy break line. Further, the first width surface panel 2 and the second width surface panel 4 have base end fold easy lines 23 that connect between both ends of the first separation line 21. Examples of the easy break line include a perforation in which a plurality of cutting lines are alternately continuous with seams (non-cutting portions) provided between the cutting lines.

<First separation line>
The first separation line 21 is formed at the upper part of the first width panel 2 and the second width panel 4 and at the center in the left-right direction. The vertical positions at both ends of the first separation line 21 are equal. As shown in FIG. 3, the first separation line 21 includes a pair of straight portions 21 a extending in the vertical direction and a connection portion 21 b that connects lower ends of the pair of straight portions 21 a. The connection part 21b is formed in the downward arch shape.

  The lower limit of the distance D1 between the pair of straight portions 21a is preferably 4 cm, and more preferably 6 cm. On the other hand, the upper limit of the distance D1 is preferably 10 cm, and more preferably 8 cm. If the distance D1 is less than the lower limit, it may be difficult to insert a finger into the handle hole Y formed by folding the handle hole forming folding piece 22. Conversely, when the distance D1 exceeds the upper limit, the handle hole Y becomes too large, and the strength of the first width panel 2 and the second width panel 4 may be insufficient in the assembled state of the box A. .

  As a minimum of the up-down direction length L1 of the 1st separating line 21, 1.5 cm is preferable and 2.5 cm is more preferable. On the other hand, the upper limit of the length L1 is preferably 5.0 cm, and more preferably 4.0 cm. If the length L1 is less than the lower limit, the handle hole forming folded piece 22 may not be reliably engaged with an opening 28 of a reinforcing folded piece 26 described later. Conversely, when the length L1 exceeds the upper limit, the handle hole Y becomes too large, and the strength of the first width panel 2 and the second width panel 4 may be insufficient in the assembled state of the box A. is there.

<Folding piece for forming the handle hole>
The folding hole 22 for forming the handle hole is formed by the first separating line 21 and the proximal folding easy line 23 that connects between the both ends of the first separating line 21 (between the upper ends of the pair of linear portions 21a in this embodiment). Defined. The folding hole 22 for forming a handle hole has an intermediate easy-to-bend line 24 that crosses the lower side in the left-right direction below the proximal-end easy-to-fold line 23. The intermediate fold easy line 24 connects the side edges of the handle hole forming folding piece 22 defined by the pair of straight portions 21a. The proximal fold easy line 23 and the intermediate fold easy line 24 are parallel to the upper edges of the first width panel 2 and the second width panel 4.

  The proximal bending easy line 23 is preferably a lead ruled line in which a cutting line and a ruled line formed by pushing the inner surface of the first width panel 2 or the second width panel 4 are alternately arranged. Thus, since the proximal fold easy line 23 is the lead ruled line, the handle hole forming folding piece 22 is moved to the inner surface side of the first width panel 2 and the second width panel 4 by the proximal fold easy line 23. Easy to insert. Thereby, the handle hole forming folding piece 22 can be easily engaged with the opening 28 of the reinforcing folding piece 26 folded on the inner surface side of the first width panel 2 and the second width panel 4.

  The intermediate folding easy line 24 is preferably a lead ruled line in which a cutting line and a ruled line formed by pushing the inner surface of the first width surface panel 2 or the second width surface panel 4 are alternately arranged. Thus, the intermediate folding easy line 24 is the lead ruled line, so that the reinforcing folding piece 26 is folded on the inner surfaces of the first width panel 2 and the second width panel 4 to form a handle hole. A portion of the folding piece 22 closer to the tip than the intermediate folding easy line 24 can be easily folded back to the inner surface side of the reinforcing folding piece 26. As a result, the folded state of the reinforcing folding piece 26 on the inner surface side of the first width panel 2 and the second width panel 4 can be stably maintained, and the strength of the handle formed above the handle hole Y can be maintained. Can be reliably increased.

  The lower limit of the ratio of the distance between the proximal fold easy line 23 and the intermediate fold easy line 24 to the sheet thickness is preferably 1.0, and more preferably 1.5. On the other hand, the upper limit of the ratio is preferably 2.5, and more preferably 2.2. If the ratio is less than the lower limit, it is difficult to position the intermediate fold easy line 24 on the inner surface side of the reinforcing fold piece 26 in a state where the proximal fold easy line 23 is bent. As a result, there is a possibility that a portion of the front end side of the intermediate folding easy line 24 of the handle hole forming folding piece 22 is difficult to be folded back to the inner surface side of the reinforcing folding piece 26. On the other hand, if the ratio exceeds the upper limit, the distance between the proximal fold easy line 23 and the intermediate fold easy line 24 becomes too large, and the folded state of the reinforcing folding piece 26 may be difficult to maintain accurately. There is.

(Upper outer flap)
The pair of upper outer flaps 5 and 6 are each formed in a substantially rectangular shape. The pair of upper outer flaps 5 and 6 have substantially the same shape. The length in the extending direction of the pair of upper outer flaps 5, 6 is approximately ½ of the width of the first width panel 2 and the second width panel 4.

(Upper inner flap)
The pair of upper inner flaps 7 and 8 are each formed in a substantially rectangular shape. The pair of upper inner flaps 7 and 8 have substantially the same shape.

  The pair of upper inner flaps 7 and 8 are separated by a second separation line 25 that is formed by a cutting line or a breakable line that is located at both ends of the first width surface panel 2 and the second width surface panel 4 at the connecting portion side and is convex at the tip side. A pair of reinforcing folding pieces 26 are defined and folded on the first width panel 2 and the second width panel 4 in an assembled state.

<Second separation line>
As shown in FIG. 3, the second separation line 25 includes a pair of straight portions 25a extending in the vertical direction (extending direction of the upper inner flaps 7 and 8) and the upper ends of the pair of straight portions 25a (a pair of straight portions). 25a, and connecting portions 25b for connecting the upper inner flaps 7, 8 of the upper inner flaps 7 and 8).

  Both ends of the second separation line 25 may be located at a connecting portion between the pair of upper inner flaps 7, 8 and the first width surface panel 2 and the second width surface panel 4. Further, both ends of the second separation line 25 may be located on the tip side of the pair of upper inner flaps 7 and 8 with respect to the connecting portion. Since the both ends of the second separation line 25 are positioned closer to the distal ends of the pair of upper inner flaps 7 and 8 than the connecting portion, a gap in the connecting portion can be eliminated.

<Folding piece for reinforcement>
As shown in FIGS. 4 and 5, the pair of reinforcing folding pieces 26 are folded on the inner surfaces of the first width panel 2 and the second width panel 4 in the assembled state of the box A. The pair of reinforcing folding pieces 26 includes a reinforcing folding easy line 27 that crosses the distal end side in the left-right direction with respect to both ends of the second separation line 25, and a region overlapping the handle hole forming folding piece 22 in a folded state. And an opening 28 with which the handle hole forming folding piece 22 is engaged. In the box sheet, the reinforcing folding piece 26 has the reinforcing folding easy line 27, so that the region of the reinforcing folding piece 26 on the front end side with respect to the reinforcing folding easy line 27 has the first width surface panel 2 and the second width panel 2. It can be easily folded on the width panel 4.

  The reinforcing folding easy line 27 is parallel to the upper edges of the first width panel 2 and the second width panel 4. The lower limit of the ratio of the distance D2 between the upper edges of the first width panel 2 and the second width panel 4 and the reinforcing folding easy line 27 to the sheet thickness is preferably 1.0, and more preferably 1.2. On the other hand, the upper limit of the ratio is preferably 2.5 and more preferably 2.0. If the above ratio is less than the lower limit, the region that is continuous from the reinforcing fold easy line 27 to the front end side and the inner surfaces of the first and second wide surface panels 2 and 4 in a state where the reinforcing fold easy line 27 is bent. May be pressed against each other and it may be difficult to stably maintain the folded state of the pair of reinforcing folding pieces 26. On the other hand, if the ratio exceeds the upper limit, it may be difficult to make contact with the inner surfaces of the first width panel 2 and the second width panel 4 from the reinforcing folding easy line 27 to the tip side.

  The reinforcing folding easy line 27 is preferably a lead ruled line in which a cutting line and a ruled line formed by pushing the inner surfaces of the pair of upper inner flaps 7 and 8 are alternately arranged. As described above, the reinforcing folding easy line 27 is the lead ruled line, so that the reinforcing folding piece 26 can be easily folded on the inner surfaces of the first width panel 2 and the second width panel 4.

  The opening 28 is formed at the center position in the left-right direction of the pair of upper inner flaps 7, 8. The opening 28 forms a handle hole Y together with the opening formed by folding the handle hole forming fold piece 22 in a state in which the reinforcing fold piece 26 is folded on the inner surface side of the first width panel 2 and the second width panel 4. To do. In the folded state of the reinforcing folding piece 26, the outer edge of the opening 28 substantially coincides with the outer edge of the handle hole forming folding piece 22.

  The opening 28 has a pair of straight portions 29 a corresponding to the pair of straight portions 21 a of the first separation line 21 in a state where the reinforcing folding piece 26 is folded. The distance D1 between the pair of straight portions 21a of the first separation line 21 is preferably larger than the distance D3 between the pair of straight portions 29a of the opening 28 (width of the opening 28 corresponding to the pair of straight portions 21a). The distance D1 between the pair of straight portions 21a of the first separation line 21 is larger than the distance D3 between the pair of straight portions 29a of the opening 28, so that the handle hole forming folding piece 22 is engaged with the opening 28. Easy to maintain stably.

  The lower limit of the difference between the distance D1 between the pair of straight portions 21a of the first separation line 21 and the distance D3 between the pair of straight portions 29a of the opening 28 is preferably 1 mm, and more preferably 5 mm. On the other hand, the upper limit of the difference is preferably 15 mm, and more preferably 12 mm. If the difference is less than the lower limit, the engagement between the handle hole forming folding piece 22 and the opening 28 may be easily released when an unintended external force or the like is applied. On the contrary, if the difference exceeds the upper limit, it may be difficult to insert the handle hole forming folding piece 22 into the opening 28.

<Advantages>
In the box sheet, a reinforcing folding piece 26 is folded on the first width panel 2 and the second width panel 4, and the handle hole forming folding piece 22 is engaged with an opening 28 formed in the reinforcing folding piece 26. By doing so, the strength of the handle hole Y can be increased. Specifically, the handle can be doubled by the first width panel 2 or the second width panel 4 and the reinforcing folding piece 26, and the handle is held at the lower end of the overlapping portion constituting the handle. By disposing the hole forming folding piece 22, the strength of the handle can be increased, and the breakage from the upper end of the handle hole can be suppressed. Therefore, according to the said sheet | seat for boxes, articles | goods can be conveyed stably.

[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 reinforcing folded piece may have a notch that is opened to the front end side of the reinforcing folded piece and engages with the folding hole forming folded piece, instead of the opening.

  The first separation line may have a pair of widened portions that are separated from each other from the top to the bottom instead of the pair of straight portions. In the box sheet, since the first separation line has a pair of widened portions, it is easy to stably maintain the engagement state of the handle hole forming folded piece with the opening or notch of the reinforcing folded piece. .

  In the above embodiment, the case where the pair of reinforcing folding pieces are folded on the inner surfaces of the first width panel and the second width panel has been described. However, the box sheet includes the pair of reinforcing folding pieces as the first width panel. And you may fold on the outer surface side of a 2nd width surface panel. In this case, the proximal fold easy line, the intermediate fold easy line and the reinforcing fold easy line may be lead crease lines in which cutting lines and crease lines formed by pushing the outer surface of the sheet are alternately continuous. Good.

  The first width surface panel and the second width surface panel may not have a base end bending easy line connecting both ends of the first separation line. In addition, the handle hole forming folding piece may not have an intermediate easy-to-bend line that crosses the lower side in the left-right direction below the base-end bendable line.

  As described above, the box sheet of the present invention is suitable as a box sheet for packing an article because the article can be stably conveyed.

DESCRIPTION OF SYMBOLS 1 1st length surface panel 2 1st width surface panel 3 2nd length surface panel 4 2nd width surface panel 5,6 Upper outer flap 7,8 Upper inner flap 9,10 Lower outer flap 11,12 Lower inner flap 13 Glue part 21 First separation line 21a Straight line part 21b Connection part 22 Folding piece for hook hole formation 23 Base end easy folding line 24 Intermediate folding easy line 25 Second separation line 25a Straight line part 25b Connection part 26 Reinforcing folding piece 27 Bending easy line 28 for reinforcement Opening 29a Straight line part A Box X Sealing tape Y Handle hole

Claims (5)

A first length face panel, a first width face panel, a second length face panel, and a second width face panel, which are connected from one side in the left-right direction to the other side and assembled into a rectangular tube shape;
A pair of upper outer flaps extending from the upper edge of the first length surface panel and the second length surface panel;
A pair of upper inner flaps extending from the upper edges of the first and second width panels,
A box sheet that can be assembled into a box shape,
The first width panel and the second width panel have a pair of hand-hole forming folding pieces defined by a first separation line composed of a downwardly protruding cutting line or an easy-to-break line,
The pair of upper inner flaps are defined by a second separation line consisting of a cutting line or an easy-to-break line that is located at both ends of the first width surface panel and the connecting portion side with the second width surface panel and that protrudes toward the front end side. A pair of reinforcing folding pieces that are folded on the first width panel and the second width panel in a state;
The box sheet having an area where the pair of reinforcing folding pieces overlap with the folding hole for forming the handle hole in the folded state, and having an opening or a notch with which the folding piece for forming the handle hole is engaged. The first separation line has a pair of linear portions extending in the vertical direction and a connecting portion that connects lower ends of these linear portions,
An interval between the pair of straight portions is larger than a width of the opening or notch corresponding to the pair of straight portions in the folded state of the reinforcing folding piece,
The box sheet according to claim 1, wherein a difference between the distance between the pair of linear portions and the width of the opening or notch is 1 mm or more and 15 mm or less.   3. The box sheet according to claim 1, wherein the reinforcing folding piece has a reinforcing easy-to-bend line that crosses the tip side in the left-right direction with respect to both ends of the second separation line. The first width panel and the second width panel have proximal fold lines that connect both ends of the first separation line;
The handle hole forming folding piece has an intermediate fold line that crosses the lower side in the left-right direction below the proximal fold line.
The box sheet according to claim 1, wherein a ratio of a distance between the proximal fold easy line and the intermediate fold easy line with respect to the sheet thickness is 1.0 or more and 2.5 or less.   The box intermediate according to claim 4, wherein the intermediate folding easy line is a lead ruled line in which a cutting line and a ruled line formed by pushing the inner surface of the first width panel or the second width panel are alternately continuous. Sheet.

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