JP2023047058A - box sheet - Google Patents

Abstract

To provide a box sheet which can be assembled into a box body capable of suppressing an increase in time and labor of packaging work and capable of preventing a packaged article from being damaged even when a cutter is used for unsealing the box body having the article stored therein.SOLUTION: There is provided a box sheet which can be assembled into a box body, in which the box sheet comprises a pair of length-side face panels and a pair of width-side face panels which are alternately connected in the left and right direction, a pair of lid outer flaps extending from the upper edges of the pair of length-side face panels, a pair of lid inner flaps extending from the upper edges of the pair of width-side face panels, and a cover plate extending from the tip edge of one lid outer flap of the pair of lid outer flaps. In an assembled state, the cover plate is located below other lid outer flaps and the entire tip edges of other lid outer flaps is covered from below by the cover plate and the pair of lid inner flaps.SELECTED DRAWING: Figure 1

Description

The present invention relates to box sheets.

Boxes assembled from corrugated cardboard sheets and the like are widely used for storing and transporting articles. The corrugated cardboard sheet includes a pair of length panels and a pair of width panels alternately connected in the left-right direction, lid outer flaps extending from the upper edges of the length panels and the width panels, and the A configuration is known that has a lid inner flap extending from the lower edge of the length side panel and the width side panel, and can be assembled into an A-type (orange box type) box body. Normally, A-type boxes are assembled by attaching sealing tape to the joints of the outer lid flaps facing each other, and sealing tape is pasted to the joints of the inner lid flaps facing each other. The bottom is assembled by doing this.

For example, the lid portion will be described in more detail. After folding inward a pair of lid inner flaps extending from the upper edges of the pair of width panels, respectively, they extend from the upper edges of the pair of length panels, and are assembled. A pair of lid outer flaps, whose tip edges are abutted against each other, are folded inward so as to overlap the lid inner flaps from above, and the butted tip edges are sealed. At this time, the tip edges of the pair of in-lid flaps are separated from each other due to the length relationship in the assembled state, and an in-lid flap-free region is generated between the pair of in-lid flaps. In general, articles positioned below the flap-less region in the lid are more likely to be damaged.

As a box body for preventing such a packed article from being damaged, there has been proposed a box body in which a part of the flap inside the lid is configured to be separable as a separation piece and configured to compensate for the missing region. (See JP-A-2012-206743). It is said that in the above-mentioned box, it is possible to minimize the waste of corrugated cardboard when manufacturing the box from corrugated cardboard, and to prevent the contents from being damaged when the box is transported.

JP 2012-206743 A

Here, when taking out an article from a box in which the article is packed, it is first necessary to unseal the lid outer flaps so that the lid can be opened. One of the simple methods of unsealing the box is to cut the sealing tape with a knife along the joints of the outer lid flaps facing each other. However, while this method is simple, there is a risk of damaging the packed articles if the blade is pierced too deeply.

In the above box, the separation piece does not completely cover the region where the inner lid flap is missing, and there is also a gap in the inner lid flap that separates the separation piece. There remains a risk of damaging the article that has been placed.

In addition, in the case of the above-mentioned box, since the separation piece needs to be separated at the time of assembly, the packing work is troublesome.

The present invention has been made in view of such circumstances, and is capable of suppressing an increase in the time and effort of packing work, and preventing damage to the packed goods even when a knife is used to open a box housing the goods. To provide a box sheet capable of assembling a box which can prevent sticking.

A box sheet according to an aspect of the present invention is a box sheet that can be assembled into a box body, and includes a pair of length panels and a pair of width panels that are alternately connected in the left-right direction, and the pair of length panels. A pair of lid outer flaps extending from the upper edges of the side panels, a pair of lid inner flaps extending from the upper edges of the pair of width panels, and one of the pair of lid outer flaps. and a cover plate extending from the leading edge of the cover plate, in the assembled state, the cover plate is positioned below the other lid outer flap, and the cover plate and the pair of lid inner flaps close the other lid outer flap The entire leading edge of the is covered from below.

The box sheet of the present invention can suppress an increase in the time and effort of packing work, and can assemble a box body that can prevent the packed articles from being damaged even when a knife is used to open the box body containing the articles. is.

FIG. 1 is a schematic plan view showing a box sheet according to one embodiment of the present invention. 2 is a schematic perspective view showing a box obtained by assembling the box sheets of FIG. 1. FIG. FIG. 3 is a schematic cross-sectional view of the box of FIG. 2 taken along line AA.

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

A box sheet according to an aspect of the present invention is a box sheet that can be assembled into a box body, and includes a pair of length panels and a pair of width panels that are alternately connected in the left-right direction, and the pair of length panels. A pair of lid outer flaps extending from the upper edges of the side panels, a pair of lid inner flaps extending from the upper edges of the pair of width panels, and one of the pair of lid outer flaps. and a cover plate extending from the leading edge of the cover plate, in the assembled state, the cover plate is positioned below the other lid outer flap, and the cover plate and the pair of lid inner flaps close the other lid outer flap The entire leading edge of the is covered from below.

In a box formed by assembling the box sheets, the entire leading edge of the other outer lid flap is covered from below by a cover plate extending from the leading edge of one outer lid flap and a pair of inner lid flaps. Therefore, when a knife is used to open a box containing articles, the tip of the knife is prevented from reaching the packed articles by the cover plate or the pair of inner lid flaps. Therefore, even when a knife is used to open the box containing the articles, the packed articles can be prevented from being damaged. Further, when assembling the box sheet into the box body, the lid outer flap from which the cover plate extends out of the pair of lid outer flaps is folded first, and the cover plate is positioned below the other lid outer flaps. Exhibits anti-scratch function. In other words, since only the folding order of the lid outer flaps is specified in contrast to the conventional packing work, it is possible to suppress an increase in the time and effort of the packing work.

In the assembled state, both ends of the cover plate in the left-right direction are preferably overlapped with the inner lid flap in a plan view. By arranging the cover plate so that both ends of the cover plate in the left-right direction are overlapped with the inner lid flap in a plan view in the assembled state in this manner, the damage prevention function can be exhibited more effectively.

It is preferable that the cover plate has a rectangular shape with the base edge as the long side or a trapezoid shape with the base edge as the bottom. By forming the cover plate in a rectangular shape with the base edge as the long side or in a trapezoid shape with the base edge as the bottom, the scratch prevention function can be exhibited more effectively. The rectangular or trapezoidal shape includes, for example, rounded corners in addition to the exactly rectangular or trapezoidal shape.

The extension direction length of the cover plate is preferably 10 mm or more and 20 mm or less. By setting the extension direction length of the cover plate within the above range, it is possible to reduce the amount of sheet material used for the box sheet while maintaining the scratch prevention function.

The extension direction length of the lid inner flap is preferably equal to the sum of the extension direction length of the lid outer flap and the extension direction length of the cover plate. By equalizing the length in the extending direction of the inner lid flap and the sum of the length in the extending direction of the outer lid flap and the extending direction length of the cover plate in this way, the sheet material for the box sheet is reduced. It is possible to shorten the portion where the tip edges of the other lid outer flaps are covered only by the cover plate while suppressing an increase in the amount used. Therefore, the scratch prevention function can be exhibited more effectively.

In the present invention, the “left and right direction” means the horizontal direction in the assumed general usage of the box formed by assembling the box sheets, and the “upper” and “lower” are assumed. However, it is not intended to limit the orientation of the box during use. "Inside" and "outside" refer to the inside and outside of the box, respectively.

[Details of the embodiment of the present invention]
Hereinafter, a box sheet according to an embodiment of the present invention will be described with reference to the drawings as appropriate.

The box sheet shown in FIG. 1 is a box sheet from which the box body 10 shown in FIG. 2 can be assembled. The box sheet is formed from one sheet material. In FIG. 1, thick solid lines indicate cutting lines obtained by cutting the sheet material, and thin solid lines indicate ruled lines formed by crimping the sheet material.

As a sheet material for forming the box sheet, for example, a cardboard sheet, a plastic board, a cardboard, or the like can be used, and among them, a cardboard sheet is preferably used. In the following, a case where the box sheet is made of corrugated cardboard will be described as an example, but the above-mentioned sheet material is not intended to be limited to corrugated cardboard.

The corrugated cardboard sheet may be a so-called double flute in which a core is sandwiched between three liners instead of one in which both sides of a core are sandwiched between a pair of liners. A so-called single-faced corrugated board having a liner attached only to one side of the core may be used.

From the viewpoint of strength, the lower limit of the thickness of the sheet material is preferably 3 mm. On the other hand, although the upper limit of the thickness of the sheet material is not particularly limited, 8 mm is preferable from the viewpoint of ease of assembly to the box 10 .

The box sheet includes a pair of length panels 1 and a pair of width panels 2 alternately connected in the left-right direction (the x direction in FIG. 1), and extending from the upper edges of the pair of length panels 1. A pair of lid outer flaps 3, a pair of lid inner flaps 4 extending from the upper edges of the pair of width panels 2, and one of the pair of lid outer flaps 3 extending from the tip edge of one of the lid outer flaps 3. and a cover plate 5 . In addition, the box sheet includes a pair of bottom outer flaps 6 extending from the lower edges of the pair of length panels 1, a pair of bottom inner flaps 7 extending from the lower edges of the pair of width panels 2, A margin portion 8 is provided.

<Length panel and width panel>
The length panel 1 and the width panel 2 are substantially rectangular. Also, the pair of length panels 1 have the same size, and the pair of width panels 2 have the same size.

The vertical length of the length panel 1 (length in the y direction in FIG. 1) and the vertical length of the width panel 2 are equal. Further, the length of the length panel 1 in the left-right direction (the length in the x direction in FIG. 1) is greater than or equal to the length of the width panel 2 in the left-right direction.

The vertical lengths of the length panel 1 and the width panel 2, the left-right length of the length panel 1, and the left-right length of the width panel 2 are the box body assembled from the box sheet. 10 is appropriately determined so as to correspond to the size and number of items to be stored.

<Lid Outer Flap and Lid Inner Flap>
The pair of outer lid flaps 3 and the pair of inner lid flaps 4 are substantially rectangular, and are configured to be able to close the top surface side of the box 10 formed by assembling the box sheets. That is, the pair of outer lid flaps 3 and the pair of inner lid flaps 4 are bent inward at right angles to the extending length panel 1 and width panel 2, respectively, during assembly, so that the inner lid flaps 4 are bent inward and outward. The lid portion 11 of the box body 10 can be formed by being superimposed so as to form.

The pair of lid outer flaps 3 are configured so that their tip edges can be butted against each other in a plan view. The length of each lid outer flap 3 in the extending direction (the length in the y direction in FIG. 1) is, for example, half the length of the width panel 2 in the left-right direction.

It is preferable that the extension direction length of the lid inner flap 4 and the sum of the extension direction length of the lid outer flap 3 and the extension direction length of the later-described cover plate 5 are equal. Generally, the box sheet is produced by punching out a rectangular sheet material. Therefore, even if the extension direction length of the inner lid flap 4 is equal to the sum of the extension direction length of the outer lid flap 3 and the extension direction length of the cover plate 5, the necessary size of the sheet material is does not change. Therefore, the extension direction length of the inner lid flap 4 can be maximized within a range in which the amount of sheet material used for the box sheet does not increase. At this time, since the inner lid flap missing area generated between the pair of inner lid flaps 4 in the assembled state is minimized, the portion where the tip edge of the other outer lid flap 3 is covered only by the cover plate 5 is shortened. be able to. Therefore, the scratch prevention function can be exhibited more effectively. Here, "equal" includes both lengths that are exactly the same as well as lengths that differ by less than 5%, preferably less than 3%, of their average length.

The lengths of the outer lid flap 3 and the inner lid flap 4 in the left-right direction (the length in the x direction in FIG. 1) are not particularly limited, but the length panel 1 and the width panel 2 extend in the left-right direction. is preferably equal to the length of

<Cover Flap>
As shown in FIG. 1, the cover plate 5 has a trapezoidal shape with a base edge as a lower base (longer base), and is preferably an isosceles trapezoidal shape. By forming the cover plate 5 in a trapezoidal shape with the base edge as the bottom in this manner, the scratch prevention function can be exhibited more effectively. Moreover, it is preferable that the cover plate 5 is bilaterally symmetrical about the center line in the lateral direction (width direction) of the lid outer flap 3 on which the cover plate 5 is provided. By configuring the cover plate 5 bilaterally symmetrical about the center line in this way, it is geometrically balanced. The horizontality of the cover plate 5 can be easily maintained even if it is pushed. Therefore, it is possible to prevent the cover plate 5 from tilting and strongly abutting the stored articles locally, so that the articles are less likely to be damaged.

As shown in FIG. 3, the cover plate 5 is positioned below the other lid outer flap 3 in the assembled state, and as shown in FIG. The entire leading edge of 3 is covered from below.

Further, as shown in FIG. 2, in the assembled state, both ends of the cover plate 5 in the left-right direction respectively overlap the inner lid flaps 4 in a plan view. By arranging the cover plate 5 so that both ends of the cover plate 5 in the left-right direction are overlapped with the inner lid flap 4 in plan view in the assembled state in this way, the damage prevention function can be exhibited more effectively.

On the other hand, the cover plate 5 preferably does not extend over the entire leading edge of the lid outer flap 3 . When the pair of lid outer flaps 3 are folded so that the tip edges thereof abut each other in plan view, a step corresponding to the thickness of the sheet material is generated in the portion where the cover plate 5 exists. When the cover plate 5 extends over the entire leading edge of the outer lid flap 3, this step exists over the entire leading edge of the outer lid flap 3, making it difficult to apply the sealing tape to the butted portion. Otherwise, the attached sealing tape may be easily peeled off.

It is preferable that the boundary between the cover plate 5 and the lid outer flap 3 is not provided with an easy-to-fold line. In other words, the cover plate 5 and the lid outer flap 3 are used in a flush state. By using the cover plate 5 and the lid outer flap 3 in a flush state in this manner, the cover plate 5 is less likely to bend, so that the damage prevention effect can be enhanced.

The lower limit of the extension direction length of the cover plate 5 is preferably 10 mm, more preferably 12 mm. On the other hand, the upper limit of the extension direction length of the cover plate 5 is preferably 20 mm, more preferably 18 mm. If the length of the cover plate 5 in the extending direction is less than the above lower limit, there is a risk that the outer lid flap 3 may be misaligned during sealing, and the scratch-preventing function during opening may not be sufficiently exhibited. Conversely, if the extension direction length of the cover plate 5 exceeds the above upper limit, the size of the sheet material required for the box sheet becomes unnecessarily large, and the amount of sheet material used for the box sheet increases. It may grow too large.

The lower limit of the length (L in FIG. 2) of the proximal edge of the portion where the cover plate 5 overlaps the inner lid flap 4 in plan view at each end is preferably 5 mm, more preferably 10 mm. On the other hand, the upper limit of the length L of the proximal edge is preferably 40 mm, more preferably 30 mm. If the length L of the proximal edge is less than the lower limit, there is a risk that the scratch-preventing function at the time of opening may not be sufficiently exhibited. If the length L of the base edge exceeds the upper limit, the thickness of the sheet material generated at the portion where the cover plate 5 exists when the pair of lid outer flaps 3 are folded so that the tip edges face each other in plan view. Due to the unevenness, there is a risk that it will be difficult to apply the sealing tape to the butted portion, or that the applied sealing tape will be easily peeled off.

The lower limit of the ratio of the length L of the proximal edge to the length of the inner lid flap 4 in the extending direction is preferably 0.1, more preferably 0.2. On the other hand, the upper limit of the above ratio is preferably 0.4, more preferably 0.3. If the above ratio is less than the above lower limit, there is a risk that the scratch-preventing function at the time of opening may not be sufficiently exhibited. If the above ratio exceeds the above upper limit, when the pair of lid outer flaps 3 are folded so that the tip edges face each other in a plan view, a step corresponding to the thickness of the sheet material generated at the portion where the cover plate 5 exists, There is a risk that it will be difficult to stick the sealing tape to the butted portion, or that the stuck sealing tape will be easily peeled off.

<Outer bottom flap and inner bottom flap>
The pair of outer bottom flaps 6 and the pair of inner bottom flaps 7 are substantially rectangular and configured to close the bottom side of the box 10 . That is, the pair of outer bottom flaps 6 and the pair of inner bottom flaps 7 are folded inward at right angles to the extending length panel 1 and the width panel 2, respectively, so that the inner bottom flaps 7 are folded inwardly. can be overlapped to form the bottom 12 of the box 10 .

The pair of outer bottom flaps 6 and the pair of inner bottom flaps 7 are configured in the same manner as the pair of outer lid flaps 3 and the pair of inner lid flaps 4, except that the bottom portion 12 of the box 10 can be closed. Therefore, detailed explanation is omitted.

(margin)
The margins 8 are provided at the side ends of a belt-shaped body composed of a pair of length panels 1 and a pair of width panels 2 alternately connected in the left-right direction. In the box sheet of FIG. 1 , the paste margin portion 8 is provided on the longitudinal panel 1 . The paste margin portion 8 is configured to be able to abut on the other side end of the strip. A pair of longitudinal panels 1 and a pair of width panels 2 can be made endless by adhering this abutting portion to the other side end of the strip. Alternatively, the bonding may be replaced by wire bonding or the like.

Although the margin 8 can be rectangular, it is preferably trapezoidal. Specifically, it is preferable that the margin portion 8 has an isosceles trapezoidal shape in which a pair of side edges of the margin portion 8 incline inward as the distance from the belt-like body increases. By making the paste margin 8 in an isosceles trapezoidal shape in this way, when the box sheet is assembled into the box body 10, while maintaining the adhesion strength near the side edges of the paste margin 8, the glue can be applied. It is possible to prevent the side edge of the allowance portion 8 from interfering with the inner lid flap 4 and the inner bottom flap 7.例文帳に追加

<How to assemble the box>
A box assembly method for assembling the box sheet into the box 10 includes a rectangular tubular portion assembly step, a bottom portion assembly step, and a lid portion assembly step.

(Square tubular part assembly process)
In the square tube portion assembling step, a pair of length side panels 1 and a pair of width side panels 2, which are alternately connected in the left-right direction, are assembled into a square tube shape.

Specifically, the procedure is as follows. First, of a pair of length panels 1 and a pair of width panels 2 that are alternately connected in the left-right direction, the length panel 1 positioned at one side end (left side in FIG. 1) is replaced with the adjacent width panel. 2, and the width panel 2 positioned at the other side end (right side in FIG. 1) is folded over to the inner surface of the adjacent length panel 1. As shown in FIG. Then, the adhesive margin portion 8 is adhered to the inner surface of the width panel 2 on the other side in the left-right direction (the side opposite to the connection side with the length panel 1). As a result, the pair of length panels 1 and the pair of width panels 2 are connected endlessly. The box sheet is provided to the user (the user of the box 10) in this state. The paste margin portion 8 can be adhered to the width panel 2 using, for example, an adhesive agent, a stapler, or the like.

Next, the pair of length side panels 1 and the pair of width side panels 2 which are endlessly connected are expanded into a rectangular tubular shape. As a result, the sides of the box 10 are assembled into a square tube shape.

(Bottom assembly process)
In the bottom assembly step, the bottom 12 of the box 10 is assembled by the pair of inner bottom flaps 7 and the pair of outer bottom flaps 6 .

Specifically, the procedure is as follows. First, the pair of bottom inner flaps 7 are bent inwardly of the rectangular tubular box so as to be perpendicular to the width panel 2 . Next, the pair of bottom outer flaps 6 are folded at right angles to the longitudinal panel 1 so as to contact the outer surface thereof. Since the pair of bottom outer flaps 6 are configured so that their tip edges can be butted against each other, the bottom portion 12 is formed by sticking a sealing tape to the butted portions.

(Lid assembly process)
In the lid assembly step, the lid 11 of the box 10 is assembled by the pair of outer lid flaps 3 and the pair of inner lid flaps 4 .

This step is performed after the articles to be packed are housed in the space surrounded by the bottom portion 12 and the rectangular tubular portion.

Specifically, the procedure is as follows. First, the pair of inner lid flaps 4 are bent inwardly of the rectangular tubular box so as to be perpendicular to the width panel 2 . Next, of the pair of lid outer flaps 3, the outer lid flap 3 from which the cover plate 5 extends is first bent at a right angle to the length panel 1 so as to come into contact with the outer surface. At this time, both ends of the cover plate 5 overlap the outer surfaces of the pair of inner lid flaps 4 . Then, the other lid outer flap 3 is folded so as to be perpendicular to the longitudinal panel 1. - 特許庁The tip edge of the other lid outer flap 3 is in contact with the outer surface of the cover plate 5 . That is, the cover plate 5 is positioned below the other lid outer flap 3, and the cover plate 5 and the pair of lid inner flaps 4 cover the entire tip edge of the other lid outer flap 3 from below.

Since the pair of lid outer flaps 3 are configured such that their tip edges can be butted against each other in plan view, the lid portion 11 is formed by adhering a sealing tape to the butted portions.

<Opening the box>
When opening the box 10, a knife can be used. Specifically, the sealing tape is cut between the leading edges of the pair of outer lid flaps 3 that are butted against each other in plan view, that is, along the leading edge of the other outer lid flap 3 . At this time, since the lower part of the tip edge of the other outer lid flap 3 is covered with the cover plate 5 and the pair of inner lid flaps 4, unless the cover plate 5 or the pair of inner lid flaps 4 are pierced, The blade does not reach the articles packed in the box 10, and the articles are not damaged. If the sealing tape of the lid portion 11 is cut, the pair of lid outer flaps 3 can be opened and closed independently, so that the pair of lid outer flaps 3 can be set parallel to or more than the longitudinal panel 1. The lid part 11 can be unsealed by opening the lid part 11 at an angle and then opening the pair of lid inner flaps 4 so as to be parallel to the width panel 2 or at an angle greater than that. Goods can be taken out.

<Advantages>
A box body 10 formed by assembling the box sheet is constructed such that the entire leading edge of the other outer lid flap 3 is covered from below by a cover plate 5 extending from the leading edge of one outer lid flap 3 and a pair of inner lid flaps 4. covered. Therefore, when a knife is used to open the box 10 containing articles, the tip of the knife is prevented from reaching the packed articles by the cover plate 5 or the pair of inner lid flaps 4.例文帳に追加Therefore, even if a knife is used to open the box 10 containing the articles, the packed articles can be prevented from being damaged. Further, when assembling the box sheet into the box body 10, of the pair of lid outer flaps 3, the lid outer flap 3 from which the cover plate 5 extends is folded first, and the cover plate 5 is folded over the other lid outer flap 3. If it is positioned below the , it exhibits a scratch-preventing function. In other words, since only the bending order of the lid outer flap 3 is specified, it is possible to suppress an increase in the time and effort of the packing work, as compared with the conventional packing work.

[Other embodiments]
The above embodiments do not limit the configuration of the present invention. Therefore, in the above embodiment, the components of each part of the above embodiment can be omitted, replaced, or added based on the description of the present specification and common general technical knowledge, and all of them are interpreted as belonging to the scope of the present invention. should.

In the above embodiment, the cover plate has a trapezoidal shape with the base edge as the bottom, but the cover plate may have other shapes, such as a rectangular shape with the base edge as the long side. can. In this way, even if the cover plate has a rectangular shape with the base end edge as the long side, the scratch prevention function can be exhibited more effectively.

In the above embodiment, the cover plate has both left and right ends overlapping the lid inner flap in plan view in the assembled state. It's good. For example, in the assembled state, both ends of the cover plate may abut against the leading edge of the inner lid flap in plan view.

In the above embodiment, four bottom flaps form the bottom of the box sheet, but the number of bottom flaps is not limited as long as the bottom can be formed, and the specific configuration is also limited. isn't it. For example, the bottom may be formed by a single bottom flap extending from the lower edge of one of the longitudinal panels.

As described above, the box sheet of the present invention can prevent an increase in the time and effort of packing work, and can prevent the packed articles from being damaged even when a knife is used to open the box containing the articles. A box can be assembled.

1 Length side panel 2 Width side panel 3 Lid outer flap 4 Lid inner flap 5 Cover plate 6 Bottom outer flap 7 Bottom inner flap 8 Paste margin 10 Box 11 Lid 12 Bottom

Claims (5)

A box sheet that can be assembled into a box body,
a pair of length side panels and a pair of width side panels alternately connected in the horizontal direction;
a pair of outer lid flaps extending from the upper edges of the pair of longitudinal panels;
a pair of inner lid flaps extending from the upper edges of the pair of width panels;
a cover plate extending from the tip edge of one of the pair of lid outer flaps,
A box sheet in which the cover plate is positioned below the other outer lid flap in an assembled state, and the cover plate and the pair of inner lid flaps cover the entire leading edge of the other outer lid flap from below. 2. The box sheet according to claim 1, wherein, in an assembled state, both ends of the cover plate in the left-right direction respectively overlap with the inner lid flap in a plan view. 3. The box sheet according to claim 1, wherein the cover plate has a rectangular shape with the base edge as the long side or a trapezoid shape with the base edge as the bottom. 4. The box sheet according to claim 3, wherein the extending direction length of the cover plate is 10 mm or more and 20 mm or less. 5. The length in the extending direction of the inner lid flap and the sum of the length in the extending direction of the outer lid flap and the length in the extending direction of the cover plate are equal to each other, according to any one of claims 1 to 4. box sheet.

Images