JP3232968U - Box sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a box sheet having a flat inner surface and capable of assembling a bottom having high strength without using a sealing tape. A box sheet 10 extends from a pair of first side panel 1a, 1b and a pair of second side panels 2a, 2b, which are alternately connected in the left-right direction, from the lower edge of one of the first side panels. The bottom inner flap 3 to be extended, the bottom outer flap 4 extending from the lower edge of the other first side panel and being folded under the bottom inner flap, and extending from the lower edge of the pair of second side panels. A pair of bottom inner flaps 5a and 5b are provided, the bottom outer flap has a rectangular main body 11 and a convex portion 12 protruding from the tip edge of the main body, and the bottom inner flap has an extension length of a second side panel. A state in which a rectangular shape equal to the length in the left-right direction has an opening 13 into which a convex portion is inserted on the base end side, and the tip edges of the pair of bottom inner flaps are arranged between the bottom inner flap and the bottom outer flap. Butt against each other. [Selection diagram] Fig. 1

Description

The present invention relates to a box sheet.

Boxes assembled from corrugated cardboard sheets and the like are used for storing and transporting articles. The corrugated cardboard sheet includes a pair of first side panel and a pair of second side panels that are alternately connected in the left-right direction, and an upper flap that extends from the upper edges of the first side panel and the second side panel, respectively. And a lower flap extending from the lower edge of the first side panel and the second side panel, respectively, and having a structure that can be assembled into a type A (mandarin orange box type) box is known. Usually, the bottom of the A-type box body is assembled by attaching a sealing tape to the joint between the lower flaps facing each other.

On the other hand, a corrugated cardboard sheet that can assemble the bottom of the box without using a sealing tape has also been proposed. There is a so-called American lock type box as a box whose bottom can be assembled without using a sealing tape. In addition, by bending the pair of lower outer flaps inward, the engaging structure provided at the tip edge of these lower outer flaps can be engaged and the bottom can be assembled. (See Japanese Patent No. 4628487).

Japanese Patent No. 4628487

However, in the American lock type box, it is difficult to keep the inner surface of the bottom flat, and it may not be possible to stably hold the articles (hereinafter, also simply referred to as "contents") contained in the box. Further, in the box body described in Patent Document 1, when the weight of the contents is large, it may be difficult to maintain the engaged state between the pair of lower outer flaps.

The present invention has been made based on such circumstances, and provides a box sheet having a flat inner surface and a strong bottom that can be assembled without using a sealing tape. The purpose.

The box sheet according to one aspect of the present invention made to solve the above problems is a box sheet assembled into a box body, and is a pair of first side panels and a pair of side panels that are alternately connected in the left-right direction. A second side panel, an in-bottom flap extending from the lower edge of one of the first side panels, and an in-bottom flap extending from the lower edge of the other first side panel and folded underneath the in-bottom flap. It comprises a bottom outer flap and a pair of bottom inner flaps extending from the lower edge of the pair of second side panels and arranged between the bottom inner flap and the bottom outer flap, the outer bottom flap being rectangular. The main body has a shape and a convex portion protruding from the tip edge of the main body, and the in-bottom flap has a rectangular shape whose extending length is equal to the left-right length of the second side surface panel, and is on the base end side. An opening into which a convex portion is inserted is provided, and the tip edges of the pair of bottom inner flaps are abutted against each other in a state of being arranged between the bottom inner flap and the bottom outer flap.

The box sheet according to one aspect of the present invention has a flat inner surface and a strong bottom can be assembled without using a sealing tape.

FIG. 1 is a schematic plan view showing a box sheet according to an embodiment of the present invention. FIG. 2 is a schematic perspective view of a box body formed by assembling the box sheet of FIG. FIG. 3 is a cross-sectional view taken along the line III-III of the box body of FIG. FIG. 4 is a schematic bottom view showing a state in which a pair of bottom inner flaps are superposed on the lower side of the bottom inner flap when the bottom portion of the box body of FIG. 2 is assembled. FIG. 5 is a schematic bottom view showing a procedure for inserting the convex portion of the outer bottom flap into the opening of the inner flap when assembling the bottom portion of the box body of FIG. 2. FIG. 6 is a schematic bottom view of the box body of FIG.

[Explanation of Embodiments of the present invention]
First, embodiments of the present invention will be listed and described.

The box sheet according to one aspect of the present invention is a box sheet assembled into a box body, and is a pair of first side panel and a pair of second side panels that are alternately connected in the left-right direction, and one of the above. An inner flap extending from the lower edge of the first side panel, an outer bottom flap extending from the lower edge of the other first side panel and folded under the inner flap, and the pair of first side flaps. 2 A pair of bottom inner flaps extending from the lower edge of the side panel and arranged between the bottom inner flap and the bottom outer flap, and the bottom outer flap is a rectangular main body and the tip edge of the main body. The in-bottom flap has a convex portion protruding from the bottom, has a rectangular shape whose extending length is equal to the left-right length of the second side panel, and has an opening on the base end side into which the convex portion is inserted. The tip edges of the pair of bottom inner flaps are abutted against each other in a state of being arranged between the bottom inner flap and the bottom outer flap.

The box sheet has a rectangular shape in which the in-bottom flap has an extension length equal to the left-right length of the second side panel, and the tip edges of the pair of in-bottom flaps are the in-bottom flaps. And since they are abutted against each other in a state of being arranged between the outer bottom flaps, the inner surface of the box body can be kept flat. In the box sheet, the outer bottom flap has a convex portion protruding from the tip edge of the main body, and the base end side of the inner bottom flap is provided with an opening into which the convex portion is inserted. By inserting the convex portion into the opening, the bottom portion of the box body can be assembled without using a sealing tape. The box sheet has a rectangular shape in which the in-bottom flap has an extension length equal to the left-right length of the second side panel, and the opening is provided on the base end side of the bottom in-flap. In addition, since the tip edges of the pair of bottom flaps are abutted against each other, the strength of the bottom of the box can be increased.

The side edge of the pair of bottom inner flaps on the side adjacent to the base end edge of the bottom inner flap in the assembled state has an inclined region inclined inward in the width direction from the base end side toward the tip end side. In a plan view in the assembled state, it is preferable that the side edge intersects the tip edge of the main body in the inclined region. In this way, the side edge of the pair of bottom inner flaps on the side adjacent to the base end edge of the bottom inner flap in the assembled state is inclined inward in the width direction from the base end side toward the tip end side. In the plan view in the assembled state, the side edge intersects the tip edge of the main body in the inclined region, so that the convex portion can be easily inserted into the opening of the box body. The strength of the bottom can be sufficiently increased.

It is preferable that the opening is formed by a U-shaped slit that is convex from the tip end side to the base end side of the bottom inner flap. In this way, the opening is formed by a U-shaped slit that is convex from the tip end side to the base end side of the bottom inner flap, so that the opening can be made while increasing the strength of the bottom portion of the box body. The convex portion can be inserted more easily.

The ratio of the distance between the opening and the base end edge of the bottom flap to the extension length of the bottom flap is preferably 0.10 or more and 0.20 or less. As described above, when the ratio of the distance between the opening and the base end edge of the bottom flap to the extension length of the bottom flap is within the above range, the strength of the bottom of the box body can be further enhanced. it can.

It is preferable that both sides of the main body in the width direction are provided with easy-to-bend lines extending inward in the width direction from the base end side toward the tip end side. As described above, the easy-to-bend lines extending inwardly in the width direction from the base end side toward the tip end side are provided on both sides of the main body in the width direction, so that the convex portion is formed in the opening. It can be easily inserted.

In the present invention, the "left-right direction" refers to the horizontal direction in a general usage mode assumed in a box body formed by assembling a box sheet. Further, "below" means below with reference to the above-mentioned left-right direction. The “rectangular shape” is not limited to a perfect rectangular shape, and includes, for example, a shape in which irregularities are partially formed and a shape in which corners are chamfered. The “U-shape” includes a square U-shape and a shape similar to a square U-shape.

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

[Box sheet]
The box sheet 10 of FIG. 1 extends from a pair of first side surface panels 1a and 1b and a pair of second side surface panels 2a and 2b, which are alternately connected in the left-right direction, and a lower edge of one of the first side surface panels 1a. The bottom inner flap 3 to be extended, the bottom outer flap 4 extending from the lower edge of the other first side surface panel 1b and folded under the bottom inner flap 3, and the bottom of the pair of second side surface panels 2a and 2b. It includes a pair of in-bottom flaps 5a and 5b extending from the edge and arranged between the in-bottom flap 3 and the bottom-outer flap 4. Further, the box sheet 10 extends from a pair of outer lid flaps 6a and 6b extending from the upper edges of the pair of first side surface panels 1a and 1b and a pair of upper edges of the second side surface panels 2a and 2b. A pair of flaps 7a and 7b in the lid are provided, and a glue margin 8 extending from the lateral edge of the first side panel 1a located on the lateral side in the left-right direction (left side in the left-right direction in FIG. 1) is provided.

The bottom outer flap 4 has a rectangular main body 11 and a convex portion 12 protruding from the tip edge of the main body 11. The bottom flap 3 has a rectangular shape in which the extending length L1 is equal to the left-right length L2 of the second side surface panels 2a and 2b. An opening 13 into which the convex portion 12 is inserted is provided on the base end side of the bottom inner flap 3. The pair of bottom inner flaps 5a and 5b are arranged between the bottom inner flap 3 and the bottom outer flap 4, and their tip edges are abutted against each other. In addition, in this specification, "top" means the top in a general usage mode assumed in a box body formed by assembling a box sheet. Further, in FIG. 1, the thick solid line indicates a cutting line formed by cutting the sheet, and the thin solid line is formed by pressing the inner surface of the sheet (the surface located inside in the assembled state of the box). Indicates a ruled line.

The box sheet 10 is assembled into the box body 20 shown in FIGS. 2 and 3. The procedure for assembling the box sheet 10 into the box body 20 will be described. First, the first side panel 1a located on the outside in the left-right direction (left side in the left-right direction in FIG. 1) is folded over the inner surface of the second side panel 2a connected to the first side panel 1a, and the outside in the left-right direction (in FIG. 1). The second side panel 2b located on the right side in the left-right direction) is folded onto the inner surface of the first side panel 1b connected to the second side panel 2b, and the glue margin 8 is folded onto the inner surface of the folded second side panel 2b. Stick it on. Subsequently, the pair of first side surface panels 1a and 1b and the pair of second side surface panels 2a and 2b connected in an endless manner are spread out in a square cylinder shape, and the bottom portion of the box body 20 is assembled.

In assembling the bottom portion of the box body 20, first, as shown in FIG. 4, the bottom inner flap 3 is bent substantially vertically inward, and then the pair of bottom inner flaps 5a and 5b are brought into contact with the lower surface of the bottom inner flap 3. Fold it inward. Subsequently, the bottom outer flap 4 is bent inward, and the bottom outer flap 4 is folded on the lower surface side of the pair of bottom inner flaps 5a and 5b. From this state, as shown in FIG. 5, the bottom outer flap 4 is pushed inward until the convex portion 12 of the bottom outer flap 4 exceeds the opening 13 of the bottom inner flap 3. Next, in this state, the pushing of the bottom outer flap 4 is released. By releasing the push-in of the bottom outer flap 4, the bottom outer flap 4 is pushed back in the horizontal direction by the reaction force of the sheet or the like, and the convex portion 12 is inserted into the opening 13 in this process. As a result, as shown in FIG. 6, the bottom portion of the box body 20 is assembled.

After the bottom of the box 20 is assembled, the desired article is housed in the box 20. After that, the pair of inner lid flaps 7a and 7b are bent substantially vertically inward, and the pair of outer lid flaps 6a and 6b are bent substantially vertically inward. As a result, the box body 20 of FIGS. 2 and 3 is assembled. A boxing tape (not shown) may be attached to the joint between the pair of outer lid flaps 6a and 6b to seal the lid portion of the box body 20.

The box sheet 10 is formed of one sheet. 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 is not particularly limited, for example, a corrugated cardboard sheet, cardboard, or the like. Examples thereof include a paper sheet, a synthetic resin sheet, and a laminated sheet of a paper sheet and a synthetic resin sheet. Among them, a paper sheet is preferable, and a corrugated cardboard sheet is particularly preferable, from the viewpoints of workability, shock absorption, handleability, recyclability, economy and the like. The corrugated cardboard on which the box sheet 10 is formed is a corrugated cardboard in which a core formed in a wavy shape is attached to a liner. For example, a core formed in a wavy shape is attached to one liner. Single-sided corrugated cardboard sheet, double-sided corrugated cardboard sheet with a liner attached to the top of the single-sided corrugated cardboard, double-sided corrugated cardboard sheet with the top of the single-sided corrugated cardboard attached to one side of the double-sided corrugated cardboard, and one side of the double-sided corrugated cardboard sheet Examples thereof include a double-sided corrugated cardboard sheet in which the tops of corrugated cardboard sheets are further bonded. Among these, double-sided corrugated cardboard sheets are preferable from the viewpoints of workability, economy, durability and the like. When the box sheet 10 is a corrugated cardboard sheet, it is preferable that the ridgeline direction of the core is parallel to the vertical direction.

(1st side panel)
The pair of first side surface panels 1a and 1b are formed in a rectangular shape and substantially the same shape. The left-right length of the first side panel 1a and 1b is larger than the left-right length of the second side panels 2a and 2b. That is, the first side surface panels 1a and 1b are length surface panels forming the length surface in the box body 20.

The length of the first side surface panels 1a and 1b in the left-right direction can be appropriately set based on the size and quantity of the articles to be housed in the box body 20, but can be, for example, 30 cm or more and 60 cm or less. The vertical length of the first side surface panels 1a and 1b can be appropriately set based on the size and quantity of the articles to be housed in the box body 20, but can be, for example, 5 cm or more and 30 cm or less.

(Second side panel)
The pair of second side panel 2a and 2b are formed in a rectangular shape and substantially the same shape. The second side surface panels 2a and 2b are width surface panels constituting the width surface of the box body 20. The length of the second side surface panels 2a and 2b in the left-right direction can be appropriately set based on the size and quantity of the articles to be housed in the box body 20, but can be, for example, 15 cm or more and 40 cm or less. The vertical length of the second side surface panels 2a and 2b can be the same as the vertical length of the first side surface panels 1a and 1b.

The second side surface panels 2a and 2b may be provided with a tongue piece 14 for forming a handle hole. For example, the tongue piece 14 is connected to both ends of the easy-to-bend line 14a extending in the left-right direction and the easy-to-bend line 14a, and can be defined by a downwardly convex slit 14b.

(Flap in the bottom)
As described above, the bottom flap 3 has a rectangular shape. The width of the bottom flap 3 is substantially equal to the left-right length of the first side panel 1a. Further, the extension length L1 of the bottom inner flap 3 is equal to the left-right length L2 of the second side surface panels 2a and 2b. "The extension length L1 of the bottom inner flap 3 is equal to the left-right length L2 of the second side surface panels 2a and 2b" means that the left-right length L2 of the second side surface panels 2a and 2b and the bottom inner flap 3 It means that the difference in the extension length L1 is 15 mm or less. Further, the upper limit of the difference between the lateral length L2 of the second side surface panels 2a and 2b and the extension length L1 of the bottom inner flap 3 is preferably 10 mm. On the other hand, the lower limit of the difference between the left-right length L2 of the second side surface panels 2a and 2b and the extension length L1 of the bottom flap 3 is preferably 0 mm. In the box sheet 10, the extension length L1 of the bottom inner flap 3 is equal to the left-right length L2 of the second side surface panels 2a and 2b, so that the inner surface of the bottom portion of the box body 20 is as shown in FIG. Can be flattened.

As described above, the bottom inner flap 3 is provided with an opening 13 into which the convex portion 12 of the bottom outer flap 4 is inserted. The opening 13 is provided at the central portion in the width direction on the base end side of the bottom inner flap 3. Since the opening 13 of the box sheet 10 is provided on the base end side of the bottom inner flap 3, it is easy to prevent the box body 20 from coming off the bottom. More specifically, the bottom inner flap 3 has a rectangular shape in which the extension length L1 is equal to the left-right length L2 of the second side surface panels 2a and 2b, so that the inner surface of the bottom portion of the box body 20 can be formed flat. .. Further, the in-bottom flap 3 is supported from below by a pair of in-bottom flaps 5a and 5b in a state of being assembled in the box body 20. Further, since the opening 13 is provided on the base end side of the bottom inner flap 3, the bottom outer flap 4 sandwiches the pair of bottom inner flaps 5a and 5b, and the bottom outer flap 4 covers substantially the entire area on the lower surface side of the bottom inner flap 3. It will cover. Therefore, the region on the base end side of the bottom inner flap 3 is likely to be maintained in the horizontal direction even when a load is applied from above by the contents or the like. As a result, it is easy to keep the state in which the convex portion 12 is inserted into the opening 13 in a stable manner, and it is possible to easily suppress the bottoming out of the box body 20.

The opening 13 is formed by a U-shaped slit that is convex from the tip end side to the base end side of the bottom inner flap 3. According to this configuration, as shown in FIG. 5, the convex portion 12 of the bottom outer flap 4 is pushed to a position exceeding the opening 13 of the bottom inner flap 3, and in this state, the pushing of the bottom outer flap 4 is released. The tongue piece 15 defined by the slit is pushed back by the reaction force of the sheet, and the convex portion 12 can be easily and surely inserted into the opening 13 without a gap. As a result, the strength of the bottom of the box body 20 can be increased.

As shown in FIG. 1, the bottom flap 3 is formed with easily bendable lines 16 connected to both ends of the slit. The easily bendable line 16 can be, for example, a lead ruled line in which a plurality of cuts and a plurality of ruled lines formed by pressing the inner surface of the sheet are alternately arranged. Since the box sheet 10 has the easily bendable line 16, the convex portion 12 can be more easily inserted into the opening 13.

The lower limit of the ratio (L3 / L1) of the distance L3 between the opening 13 and the base end edge of the bottom flap 3 with respect to the extension length L1 of the bottom flap 3 is preferably 0.10, more preferably 0.12. .. On the other hand, as the upper limit of the above ratio, 0.20 is preferable, and 0.15 is more preferable. If the ratio does not reach the lower limit, it may be difficult to insert the convex portion 12 into the opening 13. On the contrary, if the above ratio exceeds the above upper limit, it may be difficult to sufficiently suppress the bottoming out of the box body 20. The "distance between the opening and the base edge of the bottom flap" means the shortest distance between the opening and the base edge of the bottom flap.

A plurality of cuts and a plurality of ruled lines formed by pressing the inner surface of the sheet are alternately arranged in a portion of the base end edge of the bottom inner flap 3 located on the base end side of the opening 13. It is preferable that the lead ruled line 17 is provided. By providing the lead ruled line 17 in this way, the bottom flap 3 can be easily and surely bent with respect to the first side surface panel 1a.

(Outside flap)
As described above, the outer bottom flap 4 has a rectangular main body 11 and a convex portion 12 protruding from the tip edge of the main body 11. The width of the main body 11 is substantially equal to the length in the left-right direction of the first side panel 1b.

On both sides of the main body 11 in the width direction, easy-to-bend lines 18 extending inwardly in the width direction from the base end side toward the tip end side are provided. According to this configuration, as shown in FIG. 5, when the bottom outer flap 4 is pushed inward, the easy-to-bend line 18 is bent, so that the convex portion 12 can be easily pushed all the way in. As a result, the convex portion 12 can be more easily inserted into the opening 13.

As shown in FIG. 3, it is preferable that the tip edge of the convex portion 12 and the inner surface of the first side surface panel 1a are separated from each other in the state of being assembled in the box body 20. According to this configuration, the convex portion 12 can be easily inserted into the opening 13.

(Flap in the bottom)
The pair of bottom flaps 5a and 5b are formed to have substantially the same shape. The width of the base end edge of the bottom middle flaps 5a and 5b is substantially equal to the left-right length L2 of the second side surface panels 2a and 2b. As described above, the bottom inner flaps 5a and 5b are abutted against each other in the state of being assembled in the box body 20. The length of the bottom middle flaps 5a and 5b in the extending direction can be approximately 1/2 of the length of the first side surface panels 1a and 1b in the left-right direction.

As shown in FIG. 4, in the bottom middle flaps 5a and 5b, the side edges of the bottom inner flaps 3 adjacent to the base end edge of the bottom inner flap 3 are inclined inward in the width direction from the base end side toward the tip end side. It has an inclined region 19a. Since the side edge of the box sheet 10 has an inclined region 19a, the exposed area of the opening 13 when the bottom inner flaps 5a and 5b are folded is increased, and the convex portion 12 is inserted into the opening 13. Can be facilitated.

As shown in FIG. 6, the bottom inner flaps 5a and 5b have their side edges intersecting with the tip edge of the main body 11 in the inclined region 19a in a plan view in an assembled state. In the box sheet 10, the side edge intersects the tip edge of the main body 11 in the inclined region 19a, so that the contact area between the bottom inner flaps 5a and 5b and the bottom inner flap 3 is sufficiently increased. Can be done. As a result, the strength of the bottom portion of the box body 20 can be sufficiently increased.

As shown in FIG. 4, in the assembled state of the bottom inner flaps 5a and 5b, the side edge 19b on the side adjacent to the base end edge of the bottom outer flap 4 is in the direction perpendicular to the base end edge of the bottom middle flaps 5a and 5b. It is extending. The bottom inner flaps 5a and 5b can support the entire region on the tip end side of the bottom inner flap 3 from below by extending the side edges 19b in the direction perpendicular to the base end edges of the bottom middle flaps 5a and 5b. it can. As a result, it is easy to keep the bottom of the box body 20 horizontal.

(Flap outside the lid)
The pair of outer lid flaps 6a and 6b are formed to have substantially the same shape. The lid outer flaps 6a and 6b have a rectangular shape having substantially the same width as the left-right length of the first side surface panels 1a and 1b. The length of the outer lid flaps 6a and 6b in the extending direction is approximately ½ of the length of the second side surface panels 2a and 2b in the left-right direction.

(Flap in the lid)
The pair of in-cover flaps 7a and 7b are formed to have substantially the same shape. The flaps 7a and 7b in the lid have a rectangular shape having substantially the same width as the length in the left-right direction of the second side surface panels 2a and 2b. The extension direction lengths of the inner lid flaps 7a and 7b can be the same as the extension direction lengths of the outer lid flaps 6a and 6b.

<Advantage>
In the box sheet 10, the bottom inner flap 3 has a rectangular shape in which the extension length L1 is equal to the left-right length L2 of the second side surface panels 2a and 2b, and the tips of the pair of bottom inner flaps 5a and 5b. Since the edges are abutted against each other in a state of being arranged between the bottom inner flap 3 and the bottom outer flap 4, the inner surface of the box body 20 can be kept flat. The box sheet 10 has a convex portion 12 in which the outer bottom flap 4 projects from the tip edge of the main body 11, and an opening 13 into which the convex portion 12 is inserted is provided on the base end side of the inner flap 3. Therefore, by inserting the convex portion 12 into the opening 13, the bottom portion of the box body 20 can be assembled without using the sealing tape. In the box sheet 10, the bottom inner flap 3 has a rectangular shape in which the extension length L1 is equal to the left-right length of the second side surface panels 2a and 2b, and the opening 13 is on the base end side of the bottom inner flap 3. Since the tip edges of the pair of bottom flaps 5a and 5b are abutted against each other, the strength of the bottom portion of the box body 20 can be increased.

[Other Embodiments]
The above embodiment does not limit the configuration of the present invention. Therefore, in the above-described embodiment, the components of each part of the above-described 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 construed to belong to the scope of the present invention. Should be.

In the above embodiment, the configuration in which the first side surface panel is the length surface panel and the second side surface panel is the width surface panel has been described. However, the box sheet may be provided so that the first side panel constitutes a width surface panel and the second side panel constitutes a length surface panel, and the length of the first side panel in the left-right direction and the first side panel. 2 The length of the side panel in the left-right direction may be the same.

The other specific shapes of the pair of bottom flaps are not particularly limited as long as they are configured so that the tip edges are abutted against each other in a state of being assembled into a box body. For example, the bottom flaps may have a pair of side edges that extend parallel to each other. Further, the shapes of the pair of bottom flaps may be different from each other.

The specific configuration of the opening is not limited to the configuration of the embodiment. For example, the opening may be formed by punching the base end side of the bottom flap into a rectangular shape or the like.

The above-mentioned easy-to-bend lines may not be provided on both sides of the bottom outer flap in the width direction. In the box sheet, even if the main body is not provided with an easy-to-bend line, the convex portion formed on the outer bottom flap is formed on the inner flap by appropriately pushing the outer bottom flap. Can be inserted into the opening.

The second side panel may not be provided with the tongue piece for forming the handle hole. Further, even when the second side panel is provided with a tongue piece for forming a handle hole, the specific configuration of the tongue piece is not particularly limited.

The configuration of the lid portion in the box body assembled from the box sheet is not particularly limited. For example, this lid may be composed of one flap.

As described above, the box sheet according to one aspect of the present invention can be assembled into a box body having a flat inner surface and a strong bottom without using a sealing tape. It is suitably used for transporting, storing, etc.

1a, 1b 1st side panel 2a, 2b 2nd side panel 3 Bottom inner flap 4 Bottom outer flap 5a, 5b Bottom middle flap 6a, 6b Lid outer flap 7a, 7b Lid inner flap 8 Glue allowance 10 Box sheet 11 Main body 12 Convex 13 Opening 14 Tongue piece 14a Easy to bend line 14b Slit 15 Easy to bend line 17 Easy to bend line 17 Lead ruled line 18 Easy to bend line 19a Inclined area 19b Side edge 20 Box body L1 Extension length of flap in bottom L2 Second side panel Left-right length L3 Distance between the opening and the base edge of the bottom flap

Claims (5)

A box sheet that can be assembled into a box
A pair of first side panels and a pair of second side panels that are alternately connected in the left-right direction,
One of the in-bottom flaps extending from the lower edge of the first side panel,
An outer bottom flap that extends from the lower edge of the other first side panel and is folded underneath the inner bottom flap.
A pair of bottom inner flaps extending from the lower edge of the pair of second side panels and arranged between the bottom inner flaps and the bottom outer flaps.
The outer bottom flap has a rectangular body and a convex portion protruding from the tip edge of the body.
The bottom flap has a rectangular shape whose extending length is equal to the left-right length of the second side panel, and is provided with an opening on the base end side into which the convex portion is inserted.
A box sheet in which the tip edges of the pair of bottom inner flaps are abutted against each other in a state of being arranged between the bottom inner flap and the bottom outer flap. The side edge of the pair of bottom inner flaps on the side adjacent to the base end edge of the bottom inner flap in the assembled state has an inclined region that inclines inward in the width direction from the base end side toward the tip end side.
The box sheet according to claim 1, wherein the side edge intersects the tip edge of the main body in the inclined region in a plan view in an assembled state. The box sheet according to claim 1 or 2, wherein the opening is formed by a U-shaped slit that is convex from the tip end side to the base end side of the bottom inner flap. The first, second or third claim, wherein the ratio of the distance between the opening and the base end edge of the bottom flap to the extension length of the bottom flap is 0.10 or more and 0.20 or less. Sheet for the box. The method according to any one of claims 1 to 4, wherein easy-to-bend lines extending inwardly in the width direction from the base end side toward the tip end side are provided on both sides of the main body in the width direction. Box sheet.

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