JP7398585B1 - box sheet - Google Patents

Abstract

An object of the present disclosure is to provide a box sheet whose lid portion can be easily opened. A box sheet according to an aspect of the present disclosure is a box sheet that can be assembled into a box body, and includes a pair of side panels facing each other in an assembled state, and a front panel and a rear panel facing each other in an assembled state. a lid flap extending from the upper edge of the rear panel; and an insertion piece extending from the tip edge of the lid flap, the insert piece extending from the upper edge of the side panel so as to allow the lid flap to move downwardly in the assembled state. The insert piece is configured to be inserted into a gap between a side edge of the support flap and the front panel to assemble the lid portion of the box body, The flap is provided with an easy-to-fold line extending from its proximal edge to its distal edge at a distance from the side edge, and the side panel is provided with an easy-to-fold line that connects the proximal end of the easy-to-fold line to the side edge. A cutting line is provided. [Selection diagram] Figure 1

Description

The present disclosure relates to a box sheet.

2. Description of the Related Art Boxes made by assembling box sheets made of cardboard sheets and the like are widely used as packaging containers for articles. This box sheet is equipped with a lid flap that extends from the upper edge of the rear panel, and the lid is assembled by inserting an insert piece that extends from the top edge of the lid flap into the inner surface of the front panel. What can be done is publicly known (see Patent Document 1).

Japanese Patent Application Publication No. 2002-211536

In the conventional configuration as described in Patent Document 1, it may be difficult to open the lid portion easily. For example, in a configuration in which the front panel and the insertion piece are in strong contact with each other to prevent the lid from being opened unintentionally, it becomes difficult to open the lid.

The present disclosure has been made in view of such circumstances, and an object of the present disclosure is to provide a box sheet whose lid portion can be easily opened.

A box sheet according to one aspect of the present disclosure is a box sheet that can be assembled into a box body, and includes a pair of side panels facing each other in an assembled state, a front panel and a rear panel facing each other in an assembled state, and the rear panel. A support comprising a lid flap extending from the upper edge of the panel and an insertion piece extending from the tip edge of the lid flap, which extends from the upper edge of the side panel and supports the lid flap from below in an assembled state. a flap, and the insertion piece is configured to be inserted into a gap between the side edge of the support flap and the front panel to assemble the lid of the box, and the support flap is provided with the above-mentioned insert piece. An easy-to-fold line is provided at a distance from the side edge and extends from the proximal edge to the distal edge, and the side panel is provided with a cutting line connecting the base end of the easy-to-fold line and the side edge. It is being

In the box sheet according to one aspect of the present disclosure, the lid can be easily opened.

FIG. 1 is a schematic plan view showing a box sheet according to an embodiment of the present disclosure. FIG. 2 is a schematic perspective view of a box formed by assembling the box sheets of FIG. 1. FIG. 3 is a plan view of the box shown in FIG. 2. FIG. 4 is a side view showing a procedure for opening the lid of the box shown in FIG. 2. FIG. 5 is a side view showing the next opening procedure of FIG. 4 of the lid of the box of FIG. 2. FIG. 6 is a schematic side view of a box formed by assembling box sheets according to another embodiment of the present disclosure. FIG. 7 is a side view showing a procedure for opening the lid of the box shown in FIG. 6.

[Description of embodiments of the present disclosure]
First, embodiments of the present disclosure will be listed and described.

(1) A box sheet according to one aspect of the present disclosure is a box sheet that can be assembled into a box body, and includes a pair of side panels facing each other in an assembled state, and a front panel and a rear panel facing each other in an assembled state. , comprising: a lid flap extending from the upper edge of the rear panel; and an insertion piece extending from the leading edge of the lid flap; A support flap is provided, and the insertion piece is configured to be inserted into a gap between a side edge of the support flap and the front panel to assemble the lid of the box, and the support flap is provided with an easy-to-fold line extending from the proximal edge to the distal edge of the side panel at a distance from the side edge; A line is provided.

In the box body formed by assembling the box sheets, the lid portion can be easily opened by pushing up a portion of the support flap between the side edge and the easy-to-fold line by bending the easy-to-fold line. Can be done. More specifically, the box body formed by assembling the box sheets can be assembled by inserting the operator's finger into the side panel using the cutting line and pushing up the lower surface of the support flap with the finger. At the same time, the lid flap, which is arranged on this support flap, can be pushed up. As a result, the lid can be opened easily.

(2) In the above (1), it is preferable that a tongue piece for forming a finger hole is defined in the side panel by the cutting line. In this manner, the cut line defines a tongue piece for forming a finger hole in the side panel, so that the operator's finger can be easily inserted into the side panel through the finger hole. As a result, the lid can be opened more easily.

(3) In the above (2), it is preferable that the cutting line has a U-shape. Since the cutting line is U-shaped, the finger hole can be easily and reliably formed, and the lid flap can be easily opened by inserting the operator's finger into the side panel through the finger hole. It can be pushed up. As a result, the lid can be opened more easily.

(4) In any one of (1) to (3) above, the side edge and the easy bending line of the support flap extending from the side panel are relative to the width of the side panel where the cutting line is provided. It is preferable that the ratio of the distance between the In this way, the ratio of the distance between the side edge of the support flap extending from the side panel and the easy bending line to the width of the side panel on which the cutting line is provided is within the above range. This makes it easier to open the lid.

(5) In any one of (1) to (4) above, the support flaps extend from each of the pair of side panels, each of the pair of support flaps is provided with the easy-to-bend line, and It is preferable that the above-mentioned cutting line is provided on each of the pair of side panels. In this way, the support flaps extend from each of the pair of side panels, each of the pair of support flaps is provided with the easy bending line, and each of the pair of side panels is provided with the cutting line. This makes it easier to open the lid.

In the present disclosure, the term "upper" refers to the upper side in a typical usage mode assumed for a box formed by assembling the box sheet, and the term "lower" refers to the upper side in a typical usage mode assumed for the box body assembled with the box sheet. It means below in the usage mode. "Front" and "rear" refer to the "front" and "rear" in the general usage mode assumed for a box formed by assembling the box sheet. Note that the directions such as "top", "bottom", "front", and "back" are not intended to limit the orientation of the box when it is used.

In the present disclosure, the term "cutting line" includes an easy-to-cut line configured to be easily cut. "The cutting line connecting the base end of the easy-to-bend line and the side edge" is not limited to a configuration in which the base end of the easy-to-bend line and the side edge of the support flap are connected only by the cutting line; The base end of the easy line and the side edge of the support flap are connected by a cutting line and a space other than the cutting line. The expression "a finger hole forming tongue piece is defined in the side panel by the cutting line" means that at least a part of the cutting edge constituting the tongue piece is defined by the cutting line. The "U-shape" includes an angular U-shape, a circular arc shape, an elliptical arc shape, and a shape similar to these shapes.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings as appropriate. Note that each figure is a schematic diagram and may not correspond to actual dimensions, thickness, etc.

[Box sheet]
The box sheet 10 shown in FIG. 1 can be assembled into a box, and more specifically into the box 20 shown in FIGS. 2 and 3. The box sheet 10 includes a pair of side panels (a first side panel 1a and a second side panel 1b) facing each other in an assembled state, a front panel 2 and a rear panel 3 facing each other in an assembled state, and an upper surface of the rear panel 3. A lid flap 4 extending from the edge, an insertion piece 5 extending from the tip edge of the lid flap 4, and a support flap extending from the upper edge of the side panels 1a, 1b and supporting the lid flap 4 from below in the assembled state. (a first support flap 6a extending from the upper edge of the first side panel 1a and a second support flap 6b extending from the upper edge of the second side panel 1b). A pair of side panels 1a and 1b, a front panel 2, and a rear panel 3 constitute a peripheral wall of the box body 20. Further, the box sheet 10 is connected to a side edge 7a connected to the lower edge of the pair of side panels 1a and 1b, a front edge 7b connected to the lower edge of the front panel 2, and a lower edge of the rear panel 3. a rectangular bottom panel 7 having a rear side 7c; a pair of fold-in pieces 8 extending from the front side edges of the pair of side panels 1a and 1b; and the rear side edges of the pair of side panels 1a and 1b. A pair of connecting pieces 9 extending from the connecting piece 9 are provided.

In the box sheet 10, the insertion piece 5 is connected to the side edges of the support flaps 6a and 6b (the front side edge 11a of the first support flap 6a and the front side edge 11b of the second support flap 6b) and the front panel 2. The lid part 21 of the box body 20 is assembled by being inserted into the gap between the two parts. The support flaps 6a, 6b are provided with easy bending lines 12a, 12b extending from their proximal edges to their distal edges at intervals from the side edges 11a, 11b. The side panels 1a, 1b are provided with cutting lines 13a, 13b that connect the base ends of the easy bending lines 12a, 12b and the side edges 11a, 11b.

The box body 20 formed by assembling the box sheet 10 has the parts between the side edges 11a, 11b of the support flaps 6a, 6b and the easy bending lines 12a, 12b (push-up portions 24 to be described later) aligned with the easy bending lines. The lid part 21 can be easily opened by pushing up by bending 12a and 12b. More specifically, the support flaps 6a, 6b can be assembled by inserting the operator's fingers into the side panels 1a, 1b using the cutting lines 13a, 13b, and pushing up the lower surfaces of the support flaps 6a, 6b with these fingers. 6b, the lid flap 4, which is arranged on this support flap 6a, 6b, can be pushed up. As a result, the lid portion 21 can be opened easily.

The procedure for assembling the box sheet 10 into the box body 20 will be explained. First, a pair of side panels 1a and 1b are raised perpendicularly to the bottom panel 7 to form a pair of side walls of the box body 20. Further, the pair of folding pieces 8 are bent inward at right angles, and the pair of connecting pieces 9 are bent inward at right angles to engage engagement recesses 9a, which will be described later. Subsequently, the front panel 2 is raised perpendicularly to the bottom panel 7 to form the front wall of the box body 20. Specifically, the outer wall portion 2a, which will be described later, is raised perpendicularly to the bottom panel 7, and the connecting portion 2b and inner wall portion 2c are arranged so that the outer wall portion 2a and the inner wall portion 2c face each other with the folding piece 8 in between. Fold it back to the inner side of the outer wall portion 2a. Then, the convex portion 14 provided on the tip edge of the inner wall portion 2c is inserted into the locking hole 15 provided on the front side 7b of the bottom panel 7.

Next, the pair of support flaps 6a, 6b are bent inward at right angles to the pair of side panels 1a, 1b. Furthermore, the rear panel 3 is raised perpendicularly to the bottom panel 7 to form the rear wall of the box body 20, the lid flap 4 is bent to face the bottom panel 7, and the insertion piece 5 is bent inward. is inserted into the gap between the side edges 11a, 11b of the support flaps 6a, 6b and the front panel 2 to form the lid portion 21 of the box body 20. As a result, the box body 20 shown in FIGS. 2 and 3 is assembled.

The box sheet 10 is a single sheet body. The sheet used for the box sheet 10 is not particularly limited as long as it has enough strength to maintain the shape of the box body 20 formed by assembling the box sheet 10, and may include, for example, a corrugated sheet, cardboard, etc. Examples include paper sheets, synthetic resin sheets, and laminated sheets of paper sheets and synthetic resin sheets. Among these, paper sheets are preferred from the viewpoint of processability, shock absorption, handling, recyclability, economic efficiency, etc., and corrugated sheets are particularly preferred. The corrugated board sheet forming the box sheet 10 is one in which a corrugated core of base paper is bonded to a liner; for example, a corrugated core is bonded to one liner. single-sided corrugated sheet, double-sided corrugated sheet with a liner attached to the corrugated top of a single-sided corrugated sheet, double-sided corrugated sheet with the corrugated top of a single-sided corrugated sheet pasted on one side of a double-sided corrugated sheet, double-sided corrugated sheet with one side of a double-sided corrugated sheet Examples include double-sided corrugated cardboard sheets in which corrugated tops of single-sided corrugated sheets are further bonded together. Among these, double-sided corrugated sheets are preferred from the viewpoint of workability, economy, durability, and the like. Further, when the box sheet 10 is made of a corrugated cardboard sheet, the ridgeline of the center of the corrugated cardboard sheet may extend in the direction in which the lid flap 4 extends, although it is not particularly limited.

(bottom panel)
The bottom panel 7 constitutes the bottom wall of the box body 20. The bottom panel 7 has a rectangular shape having a pair of opposing sides 7a, and opposing front sides 7b and rear sides 7c. As described above, the front side 7b of the bottom panel 7 is provided with the locking hole 15 into which the convex portion 14 provided at the tip edge of the inner wall portion 2c is inserted.

(side panel)
The side panels 1a and 1b have a rectangular shape, for example, a rectangular shape in which the height (vertical length) is small relative to the width (horizontal length in the assembled state). The width of the side panels 1a, 1b is equal to the length of the side 7a of the bottom panel 7.

As described above, the side panels 1a, 1b have cutting lines 13a connecting the base ends of the easy bending lines 12a, 12b provided on the support flaps 6a, 6b and the side edges 11a, 11b of the support flaps 6a, 6b. , 13b are provided. As shown in FIG. 2, the cutting lines 13a, 13b define tongues 22 for forming finger holes in the side panels 1a, 1b. In this embodiment, the tongue piece 22 is defined by the upper edge of the side panels 1a, 1b and the cutting lines 13a, 13b. That is, the proximal edge of the tongue piece 22 is defined by the upper edges of the side panels 1a, 1b, and the entire cutting edge thereof is defined by the cutting lines 13a, 13b.

As shown in FIGS. 4 and 5, the tongue pieces 22 are folded inward to the side panels 1a, 1b to form finger holes 23 in the side panels 1a, 1b. In the box sheet 10, tongue pieces 22 for forming finger holes are defined in the side panels 1a, 1b by the cutting lines 13a, 13b, so that the worker's fingers can be inserted from the finger holes 23 into the side panels 1a, 1b. can be easily inserted. Then, by applying a finger inserted into the inside of the side panels 1a, 1b through the finger holes 23 to the lower surface side of the push-up portion 24, the push-up portion 24 can be easily pushed up. As a result, the lid portion 21 can be opened more easily.

The cutting lines 13a and 13b are preferably U-shaped. With this configuration, the tongue piece 22 whose upper edge is the base edge can be easily formed on the side panels 1a, 1b. Therefore, the finger hole 23 can be easily and reliably formed, and the operator can insert his or her finger into the side panels 1a, 1b through the finger hole 23 and easily push up the push-up portion 24 through a series of operations. As a result, the lid portion 21 can be opened more easily.

(support flap)
The support flaps 6a, 6b have a rectangular shape, more specifically a rectangular shape with both corner portions of the tip edges rounded. The width of the support flaps 6a, 6b is equal to the width of the side panels 1a, 1b from which they extend. As described above, the insert piece 5 is arranged between the side edges 11a, 11b of the support flaps 6a, 6b and the front panel 2 in the assembled state. Therefore, in the assembled state, a space of approximately one sheet is provided between the side edges 11a, 11b and the front panel 2 (more specifically, the inner wall portion 2c). The distance between the side edges 11a, 11b and the front panel 2 can be, for example, greater than or equal to the sheet thickness and less than or equal to four times the sheet thickness. Furthermore, the upper limit of the interval may be three times the sheet thickness or twice the sheet thickness.

The support flaps 6a, 6b have the above-mentioned easy bending lines 12a, 12b that extend longitudinally in the extending direction. The easy-to-bend lines 12a, 12b are connected to the cutting lines 13a, 13b at their proximal ends (ends on the proximal side of the support flaps 6a, 6b). Note that the type of the easy-to-bend lines 12a and 12b is not particularly limited, and for example, a portion thereof may include a cutting line.

A portion surrounded by the easy bending lines 12a, 12b and the side edges 11a, 11b is configured as a push-up portion 24 for pushing up the lid flap 4. The push-up portion 24 is a tongue whose proximal edges are the easy-bending lines 12a and 12b. The push-up portion 24 is bent along the easy bending lines 12a, 12b to push up the lid flap 4 away from the support flaps 6a, 6b. As shown in FIG. 5, in the box body 20, the lid flap 4 is pushed up by the push-up portion 24, so that a space is formed between the lid flap 4 and the side panels 1a and 1b. This space can be used to further open the lid flap 4.

The easy bending lines 12a, 12b preferably extend parallel to the direction in which the support flaps 6a, 6b extend. With this configuration, the lid flap 4 can be pushed up more easily by the push-up portion 24.

As shown in FIG. 3, the distance D between the side edges 11a, 11b of the support flaps 6a, 6b extending from the side panels 1a, 1b and the easy bending lines 12a, 12b with respect to the width W of the side panels 1a, 1b. The lower limit of the ratio (D/W) is preferably 0.1, more preferably 0.15, from the viewpoint of sufficiently exerting the effect of pushing up the lid flap 4. On the other hand, the upper limit of the ratio (D/W) is preferably 0.3, more preferably 0.25, and even more preferably 0.2, from the viewpoint of easily pushing up the tip of the lid flap 4. .

As shown in FIG. 1, the box sheet 10 has support flaps 6a, 6b extending from the pair of side panels 1a, 1b, and easy bending lines 12a, 12b on the pair of support flaps 6a, 6b, respectively. are provided, and cutting lines 13a and 13b are provided on the pair of side panels 1a and 1b, respectively. By having the box sheet 10 configured in this way, the lid portion 21 can be opened more easily.

(fold-in piece)
The fold-in piece 8 has a rectangular shape, for example. The fold-in piece 8 may extend from the entire area of the front side edge of the side panels 1a, 1b.

(Connection piece)
The connecting piece 9 has, for example, an elongated shape with an engaging recess 9a formed at its tip. The connecting piece 9 may extend from the entire area of the rear side edge of the side panels 1a, 1b. The total length of the pair of connecting pieces 9 in the extending direction is longer than the length of the rear side 7c of the bottom panel 7 so that the engaging recesses 9a can be engaged with each other. The specific shape of the engagement recess 9a is not particularly limited as long as the pair of connection pieces 9 can be engaged with each other. In this embodiment, one connecting piece 9 has an engaging recess 9a on its upper edge, and the other connecting piece 9 has an engaging recess 9a on its lower edge.

(front panel)
The front panel 2 includes an outer wall portion 2a extending from the front side 7b of the bottom panel 7, a connecting portion 2b extending from the tip edge of the outer wall portion 2a, and an inner wall portion 2c extending from the tip edge of the connecting portion 2b. has. The outer wall portion 2a, the connecting portion 2b, and the inner wall portion 2c can each have a rectangular shape. The widths of the outer wall portion 2a, the connecting portion 2b, and the inner wall portion 2c are equal to the length of the front side 7b of the bottom panel 7. A convex portion 14 that is inserted into a locking hole 15 provided in the bottom panel 7 is formed at the tip edge of the inner wall portion 2c. The connecting portion 2b is arranged parallel to the bottom panel 7 with the folding piece 8 interposed therebetween in the assembled state. The lengths of the outer wall portion 2a and the inner wall portion 2c in the extending direction are equal to the lengths of the side panels 1a and 1b in the extending direction. The length of the connecting portion 2b in the extending direction can be, for example, greater than or equal to the sheet thickness and less than or equal to five times the sheet thickness.

(rear panel)
The rear panel 3 has a rectangular shape. The width of the rear panel 3 is equal to the length of the rear side 7c of the bottom panel 7. The length of the rear panel 3 in the extending direction is equal to the length of the side panels 1a and 1b in the extending direction.

(lid flap)
The lid flap 4 has a rectangular shape. The width of the lid flap 4 is equal to the length of the rear side 7c of the bottom panel 7. The length of the lid flap in the extending direction is equal to the length of the side 7a of the bottom panel 7.

The box sheet 10 can easily push up the lid flap 4 using the push-up section 24 described above. Therefore, in the box sheet 10, the length of the lid flap 4 in the extending direction may be made larger than that of a normal box body, so that the front panel 2 and the insertion piece 5 are brought into strong contact. According to this configuration, unintentional opening of the lid portion 21 can be prevented. From this point of view, the length of the lid flap 4 in the extending direction may be greater than or equal to the distance between the inner surface of the front panel 2 and the inner surface of the rear panel 3 when assembled to the box body 20.

(insert piece)
The insertion piece 5 has a rectangular shape, more specifically a rectangular shape with both corners of the tip edge rounded. The insertion piece 5 extends from the entire area of the tip edge of the lid flap 4. The length of the insertion piece 5 in the extending direction may be equal to the length of the rear panel 3 in the extending direction.

[Other embodiments]
The above embodiments do not limit the configuration of the present invention. Therefore, in the above embodiment, it is possible to omit, replace, or add components of each part of the above embodiment based on the description of this specification and common general technical knowledge, and all of these are interpreted as falling within the scope of the present invention. Should.

In the above embodiment, a configuration in which a front panel, a rear panel, and a pair of side panels extend from the four sides of the bottom panel has been described. However, the specific configuration of the box sheet is not limited to the configuration described in the above embodiment. For example, the box sheet may have a front panel, a first side panel, a rear panel, and a second side panel connected in a band shape in one direction.

In the above embodiment, the configuration in which the finger hole forming tongue piece is defined by the upper edge of the side panel and the cutting line has been described. However, in the box sheet, the base end of the easy-to-bend line provided on the support flap and the cutting line may be spaced apart from each other within a range that can achieve the effects of the present disclosure. That is, in the present disclosure, "a cutting line that connects the base end of the easy-to-bend line provided on the support flap and the side edge of the support flap" means that there is a certain distance between the base end and the cutting line. including configurations with

In the embodiment described above, a configuration in which a tongue piece for forming a finger hole is defined on the side panel by a U-shaped cutting line has been described. However, in the box sheet, the finger hole forming tongue piece may be defined by a cutting line other than a U-shape. For example, as shown in FIGS. 6 and 7, it is also possible to define the tongue piece 32 by a cutting line (first cutting line 33a) extending along the upper edge of the side panel 31. More specifically, in FIGS. 6 and 7, the box sheet extends along the upper edge of the side panel 31 and connects the proximal end (not shown) of the easy bend line provided on the support flap and the side edge (not shown) of the support flap. (illustrated), and second cutting lines 33b extending downward from both ends of the first cutting line 33a. Moreover, this box sheet has an easy-to-fold line 34 that connects the lower ends of the pair of second cutting lines 33b. This box sheet is made by folding the tongue piece 32 defined by the first cutting line 33a, the pair of second cutting lines 33b, and the easy bending line 34 into the inside of the side panel 31 by bending the easy bending line 34. A finger hole 35 can be formed in the side panel 31. Even with such a configuration, the box sheet can easily open the lid of the box.

In the embodiment described above, a configuration in which a tongue piece for forming a finger hole is defined on the side panel by a cutting line has been described. However, the cutting line may be provided, for example, so as to form an opening for forming a finger hole in the side panel.

In the embodiment described above, a configuration has been described in which both of a pair of side panels are provided with a cutting line, and both of the support flaps extending from these side panels are provided with an easy-to-bend line. However, it is also possible to adopt a configuration in which the box sheet is provided with a cutting line only on one side panel, and an easy-to-fold line is provided only on the support flap extending from this side panel. That is, it is also possible to configure the finger hole to be formed only on one side panel.

1a First side panel 1b Second side panel 2 Front panel 2a Outer wall portion 2b Connection portion 2c Inner wall portion 3 Rear panel 4 Lid flap 5 Insert piece 6a First support flap 6b Second support flap 7 Bottom panel 7a Side side 7b Front side 7c Rear side 8 Folding piece 9 Connection piece 9a Engagement recess 10 Box sheet 11a, 11b Side edges 12a, 12b Easy bending lines 13a, 13b Cutting line 14 Convex part 15 Locking hole 20 Box body 21 Lid part 22 Tongue piece 23 Finger hole 24 Push-up portion 31 Side panel 32 Tongue piece 33a First cutting line 33b Second cutting line 34 Easy bending line 35 Finger hole D Distance W between the front side edge of the support flap and the easy bending line Width of the side panel

Claims (4)

A box sheet that can be assembled into a box body,
A pair of side panels facing each other in an assembled state, a front panel and a rear panel facing each other in an assembled state, a lid flap extending from an upper edge of the rear panel, and an insert piece extending from a tip edge of the lid flap. Equipped with
a support flap extending from the upper edge of the side panel and supporting the lid flap from below in an assembled state;
The insertion piece is configured to be inserted into a gap between the side edge of the support flap and the front panel to assemble the lid of the box,
The support flap is provided with an easy-to-bend line spaced apart from the side edge and extending from the proximal edge to the distal edge;
The side panel is provided with a cutting line connecting the base end of the easy-to-fold line and the side edge, and a portion of the support flap surrounded by the easy-to-fold line and the side edge is for pushing up the lid flap. It is configured as a push-up part,
The ratio of the distance between the side edge of the support flap extending from the side panel and the easy bending line to the width of the side panel on which the cutting line is provided is 0.1 or more and 0.3 or less. Box sheet. The box sheet according to claim 1, wherein the cutting line defines a tongue piece for forming a finger hole in the side panel. The box sheet according to claim 2, wherein the cutting line is U-shaped. the support flap extends from each of the pair of side panels;
4. The box sheet according to claim 1, wherein each of the pair of support flaps is provided with the easy bending line, and each of the pair of side panels is provided with the cutting line.

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