JP7110513B1 - box sheet - Google Patents

Abstract

An object of the present invention is to provide a box sheet that facilitates assembly of the bottom of a box. A box sheet according to one aspect of the present invention includes a pair of bottom outer flaps extending from the lower edges of a pair of length panels and a pair of bottoms extending from the lower edges of a pair of width panels. and a first notch into which the leading edge of one of the bottom outer flaps is inserted and a first notch into which the leading edge of the other bottom outer flap is inserted into the leading edge of each of the bottom inner flaps. Two notches are provided, and the first notch has a first inclined edge that is inclined toward the leading edge side of the bottom inner flap in which the first notch is provided and the second notch side, The second notch has a second slanted edge slanted toward the leading edge side of the bottom inner flap provided with this second notch and the first notch side, and the pair of bottom outer flaps The inclination angles of the first inclined edge and the second inclined edge are different so that they are superimposed on the pair of in-bottom flaps with . [Selection drawing] Fig. 1

Description

The present invention relates to box sheets.

2. Description of the Related Art A box formed by assembling box sheets made of corrugated cardboard sheets or the like is widely used as a packaging container for articles. The box sheet has notches at the leading edges of the pair of inner bottom flaps, and the bottom is assembled by inserting the leading corners of the pair of outer bottom flaps into these notches. It is publicly known (see Patent Document 1).

JP-A-2005-343543

Patent Literature 1 describes a configuration in which two parallel cuts are provided at the tip edges of a pair of inner bottom flaps, and insert pieces are provided at the tip edges of a pair of outer bottom flaps. Patent Literature 1 describes that the bottom portion can be formed by bending a pair of outer bottom flaps so as to press the pair of inner bottom flaps from the outside and inserting insert pieces into cuts.

According to the configuration described in Patent Literature 1, the insertion pieces of the pair of outer bottom flaps overlap the inner surfaces of the pair of inner bottom flaps at the same time. However, with this configuration, it may be difficult to facilitate assembly of the bottom portion.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a box sheet that facilitates assembly of the bottom of a box.

A box sheet according to an aspect of the present invention comprises a pair of length panels and a pair of width panels facing each other in an assembled state, and a pair of bottom outer flaps extending from lower edges of the pair of length panels. and a pair of inner bottom flaps extending from the lower edges of the pair of width panels, the box sheet being assembled into a box body, wherein the leading edge of each of the inner bottom flaps is attached to one of the outer bottom flaps. A first notch into which the corner on the tip side of the flap is inserted and a second notch into which the corner on the tip side of the other bottom outer flap is inserted are provided. It has a first inclined edge inclined toward the tip edge side of the bottom inner flap provided with the notch and the second notch side, and the second notch is the bottom where the second notch is provided. It has a second inclined edge that is inclined toward the leading edge side of the inner flap and the first notch side, and the pair of bottom outer flaps are superimposed on the pair of bottom inner flaps with a time lag. The inclination angles of the first inclined edge and the second inclined edge are different.

The box sheet according to one aspect of the present invention allows easy assembly of the bottom of the box.

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 formed by assembling the box sheets of FIG. 1. FIG. 3 is a schematic bottom view showing a state in the middle of assembling the bottom of the box of FIG. 2. FIG. Figure 4 is a schematic bottom view showing the next state of Figure 3 during assembly of the bottom of the box of Figure 2; 5 is a schematic bottom view of the box of FIG. 2. FIG.

[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 comprises a pair of length panels and a pair of width panels facing each other in an assembled state, and a pair of bottom outer flaps extending from lower edges of the pair of length panels. and a pair of inner bottom flaps extending from the lower edges of the pair of width panels, the box sheet being assembled into a box body, wherein the leading edge of each of the inner bottom flaps is attached to one of the outer bottom flaps. A first notch into which the corner on the tip side of the flap is inserted and a second notch into which the corner on the tip side of the other bottom outer flap is inserted are provided. It has a first inclined edge inclined toward the tip edge side of the bottom inner flap provided with the notch and the second notch side, and the second notch is the bottom where the second notch is provided. It has a second inclined edge that is inclined toward the leading edge side of the inner flap and the first notch side, and the pair of bottom outer flaps are superimposed on the pair of bottom inner flaps with a time lag. The inclination angles of the first inclined edge and the second inclined edge are different.

In the box sheet, the inclination angles of the first inclined edge and the second inclined edge are different so that the pair of outer bottom flaps are superimposed on the pair of inner bottom flaps with a time lag, The bottom of the box can be easily assembled.

Preferably, the pair of bottom outer flaps have the same length in the extending direction, and the length in the extending direction of the pair of bottom outer flaps is greater than 1/2 of the length of the width panel in the left-right direction. According to the box sheet, the bottom outer flap inserted into the first notch and the bottom outer flap inserted into the second notch are easily arranged on the inner surface of the bottom inner flap while shifting the timing. be. Therefore, the length in the extension direction of the pair of bottom outer flaps is equal, and the length in the extension direction of the pair of bottom outer flaps is larger than 1/2 of the length of the width panel in the left-right direction. , the pair of bottom outer flaps can be superimposed on the inner surfaces of the pair of bottom inner flaps while suppressing interference between the pair of bottom outer flaps. As a result, while the bottom part of the box is easily assembled, by partially overlapping the pair of bottom outer flaps at the bottom part, it is possible to easily suppress the bottom part from coming off.

The distance between the end of the first inclined edge on the tip side in the depth direction and the side edge of the in-bottom flap adjacent to the first inclined edge, and the end of the second inclined edge on the tip side in the depth direction. Preferably, the second slanted edge is equally spaced from the adjacent side edge of the in-bottom flap. Thus, the distance between the end of the first inclined edge on the tip side in the depth direction and the side edge of the in-bottom flap adjacent to the first inclined edge and the tip side in the depth direction of the second inclined edge and the side edge of the bottom inner flap adjacent to the second inclined edge are equal, so that the bottom outer flap inserted in the first notch and the bottom outer flap inserted in the second notch The outer bottom flap can be easily arranged on the inner surface of the inner bottom flap while sliding on the first inclined edge and the second inclined edge while shifting the timing.

The difference in inclination angle between the first inclined edge and the second inclined edge with respect to the tip edge of the in-bottom flap is preferably 10° or more and 30° or less. Thus, the difference in inclination angle between the first inclined edge and the second inclined edge with respect to the tip edge of the in-bottom flap is within the above range, so that the out-bottom flap is inserted into the first notch. and the bottom outer flap inserted into the second notch can be easily arranged on the inner surface of the bottom inner flap while sliding on the first inclined edge and the second inclined edge while shifting the timing. can.

a reduced width portion in which the side edges on both sides of the bottom outer flap extend obliquely inward in the width direction from the base end toward the distal end; and a widened portion extending obliquely outward in the width direction toward the tip edge, and the corner portion may be provided in the widened portion. In this way, the side edges on both sides of the bottom outer flap are arranged at the reduced-width portion extending obliquely inward in the width direction from the proximal side toward the distal end side, and the distal end side of the reduced-width portion. and a widened portion that extends obliquely outward in the width direction toward the tip edge of the bottom outer flap, and the corner portion is provided in the widened portion so that the first notch and the The corner portion can be easily and reliably inserted into the second notch.

BEST MODE FOR CARRYING OUT THE 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 comprises a pair of length panels 1 and a pair of width panels 2 facing each other in an assembled state, a pair of bottom outer flaps 3a extending from the lower edges of the pair of length panels 1, 3b (a first outer bottom flap 3a and a second outer bottom flap 3b) and a pair of inner bottom flaps 4 extending from the lower edges of the pair of width panels 2 are provided. The box sheet 10 includes a pair of outer lid flaps 5 extending from the upper edges of the pair of length panels 1 and a pair of inner lid flaps 6 extending from the upper edges of the pair of width panels 2. , and passages 7 extending from the side edges of the longitudinal panel 1 . A pair of length panels 1 and a pair of width panels 2 are alternately connected in the left-right direction. The passage 7 extends from the outer side edge of the longitudinal panel 1 located laterally outward (right side in FIG. 1). Boundary between length panel 1 and width panel 2, boundary between length panel 1 and lid outer flap 5 and bottom outer flap 3a, 3b, width panel 2 and lid inner flap 6 and bottom The boundary line between the inner flap 4 and the boundary line between the longitudinal panel 1 and the passage 7 are each provided with an easy fold line. The easy-to-fold line is not particularly limited, and includes, for example, a ruled line formed by crimping one side of the sheet. In the present specification, the term “upper” means the upper side of a box formed by assembling box sheets, and the term “lower” means the upper side of a box formed by assembling box sheets. It means below in the general mode of use envisioned for the box. Further, the "left-right direction" means a horizontal direction in a general usage mode assumed for a box formed by assembling box sheets.

At the leading edge of each of the bottom inner flaps 4, a first notch 12 into which the corner 11a on the tip side of one of the bottom outer flaps (first bottom outer flap 3a) is inserted, and the other bottom outer flap (second A second notch 13 is provided into which the tip-side corner 11b of the bottom outer flap 3b) is inserted. The first notch 12 has a first inclined edge 12a inclined toward the tip edge side of the bottom inner flap 4 in which the first notch 12 is provided and toward the second notch 13 side. The second notch 13 has a second slanted edge 13a that is slanted toward the tip edge side of the bottom inner flap 4 in which the second notch 13 is provided and toward the first notch 12 side. In the box sheet 10, the inclination angles of the first inclined edge 12a and the second inclined edge 13a are different so that the pair of outer bottom flaps 3a and 3b are superimposed on the pair of inner bottom flaps 4 with a time lag. there is

The box sheet 10 can be assembled into a box. Specifically, the box sheet 10 is assembled into the box body 20 of FIG. A procedure for assembling the box sheet 10 into the box 20 will be described. First, the length surface panel 1 located on the left-right direction outside (the right side in FIG. 1) is folded over the inner surface of the width surface panel 2 connected to the length surface panel 1, and the width surface panel 2 located on the left-right direction outside (the left side in FIG. 1) is folded. The width panel 2 is folded on the inner surface of the length panel 1 connected to the width panel 2, and the extension 7 is adhered to the inner surface of the folded width panel 2. - 特許庁As a result, the pair of length panels 1 and the pair of width panels 2 are connected endlessly to assemble the body (square tubular section) of the box 20 . Next, as shown in FIG. 3, the pair of inner bottom flaps 4 are folded toward the inner surface of the width panel 2, and the pair of outer bottom flaps 3a and 3b are folded over the outer surfaces of the inner bottom flaps 4, respectively. Subsequently, as shown in FIG. 4, both corners 11a on the tip side of the first outer bottom flap 3a are inserted into the first notches 12 of the pair of inner bottom flaps 4, and the second outer bottom flap 3b is The pair of outer bottom flaps 3a and 3b are pushed inward (toward the inner side of the box) so that the corners 11b on the tip side are inserted into the second notches 13 of the pair of inner bottom flaps 4. As shown in FIG. Thereafter, the pair of bottom outer flaps 3a, 3b are released from being pushed in such that the corners 11a, 11b of the pair of bottom outer flaps 3a, 3b overlap the inner surface sides of the pair of bottom inner flaps 4. As shown in FIG. Thereby, as shown in FIG. 5, the bottom part of the box 20 is assembled. Next, the pair of inner lid flaps 6 are folded inward, and the pair of outer lid flaps 5 are further folded inward, and the leading edges are butted against each other to assemble the lid portion of the box body 20 . A sealing tape X may be attached to the seam between the tip edges of the pair of lid outer flaps 5 . Thereby, the box 20 of FIG. 2 is assembled.

The sheet used for the box sheet 10 is not particularly limited as long as it has strength enough to maintain the shape of the box 20 formed by assembling the box sheet 10. For example, a corrugated cardboard sheet, cardboard, or the like. paper sheets, synthetic resin sheets, laminated sheets of paper sheets and synthetic resin sheets, and the like. 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. As the corrugated cardboard sheet forming the box sheet 10, a corrugated core made of base paper is bonded to a liner. For example, the corrugated core is bonded to a single liner. single-faced corrugated cardboard sheet, double-faced corrugated cardboard sheet with a liner attached to the crest of a single-faced corrugated cardboard sheet, double-faced corrugated cardboard sheet with a corrugated top of a single-faced corrugated board attached to one side of a double-sided corrugated sheet, and one side of a double-faced corrugated cardboard sheet A multiple double-faced corrugated cardboard sheet obtained by laminating the crests of a single-faced corrugated board further can be used. Among these, a double-faced corrugated cardboard sheet is preferable from the viewpoints of workability, economy, durability, and the like.

(long side panel)
The longitudinal panel 1 has a substantially rectangular shape. Also, the pair of length surface panels 1 have substantially the same shape. The length of the length panel 1 in the left-right direction can be equal to or greater than the length of the width panel 2 in the left-right direction. The length in the horizontal direction and the length in the vertical direction of the length panel 1 can be set based on the size of the articles to be accommodated in the box 20 and the like.

(Width panel)
The width panel 2 has a substantially rectangular shape. Also, the pair of width panels 2 have substantially the same shape. The lateral length of the width panel 2 can be set based on the size of the articles to be accommodated in the box 20 and the like. The vertical length of the width panel 2 can be the same as the vertical length of the length panel 1 .

(bottom outer flap)
The bottom outer flaps 3 a , 3 b extend from substantially the entire area of the lower edge of the longitudinal panel 1 . The bottom outer flaps 3a and 3b are formed symmetrically (axisymmetrically) with respect to the central position in the width direction. The tip edges of the bottom outer flaps 3 a and 3 b (more specifically, the tip edge of the tip portion 15 described later) extend parallel to the lower edge of the longitudinal panel 1 . The pair of bottom outer flaps 3a and 3b have the same shape.

Side edges on both sides of the bottom outer flaps 3a and 3b include a reduced-width portion 14a extending obliquely inward in the width direction from the base end side to the distal end side, and a distal end side of the reduced-width portion 14a. and a widened portion 15a extending obliquely outward in the width direction toward the tip edges of the outer flaps 3a and 3b. The corners 11a, 11b of the bottom outer flaps 3a, 3b are provided in the widened portion 15a. In other words, the outer bottom flaps 3a and 3b have a base portion 14 that narrows from the proximal side toward the distal end side, and a base portion 14 that is disposed on the distal side of the base portion 14 and widens toward the distal edges of the outer bottom flaps 3a and 3b. Corner portions 11a and 11b are provided on both sides of the tip portion 15 in the width direction. The outer edges of the corners 11a and 11b may be curved or bent so that they can be easily inserted into the first notch 12 and the second notch 13. FIG.

The extension direction lengths of the pair of bottom outer flaps 3a and 3b are equal. Further, the length in the extension direction of the pair of bottom outer flaps 3a and 3b is larger than 1/2 of the length of the width panel 2 in the left-right direction. More specifically, as shown in FIG. 5, the pair of bottom outer flaps 3a and 3b are arranged in the left-right direction length of the width panel 2 so that the tips 15 partially overlap each other when assembled in the box 20. The length in the extending direction is formed to be larger than 1/2 of .

(bottom inner flap)
The bottom inner flap 4 extends from substantially the entire area of the lower edge of the width panel 2 . The pair of bottom inner flaps 4 are formed symmetrically in the unfolded state of the box sheet 10 (the state shown in FIG. 1). The bottom inner flap 4 has a substantially rectangular shape with a first notch 12 and a second notch 13 formed at its tip edge. The tip edge of the bottom inner flap 4 extends parallel to the lower edge of the width panel 2 . The width of the bottom inner flap 4 is substantially equal to the length of the width panel 2 in the left-right direction. The extension direction length of the bottom inner flap 4 can be the same as the extension direction length of the bottom outer flaps 3a and 3b. The first notch 12 and the second notch 13 will be described in detail below.

[First notch]
The corner portion 11 a of the first bottom outer flap 3 a is inserted into the first notch 12 .

As described above, the first notch 12 has the first inclined edge 12a inclined toward the tip edge side of the bottom inner flap 4 and the second notch 13 side. The first inclined edge 12a is linear. One or both ends of the first beveled edge 12a may be rounded. The first notch 12 also has a first support edge 12b that is connected to the tip side of the first inclined edge 12a in the depth direction and extends perpendicularly to the tip edge of the inner bottom flap 4 . The first support edge 12 b extends continuously from the tip side of the first inclined edge 12 a in the depth direction and reaches the tip edge of the inner bottom flap 4 . That is, the first notch 12 has a right triangle shape with the first inclined edge 12a as the oblique side and the first support edge 12b as the adjacent side.

Both the first inclined edge 12a and the first support edge 12b are cutting edges. That is, the first notch 12 is formed by removing a part of the tip side of the inner bottom flap 4 . By being formed in this manner, the corner portion 11a of the first outer bottom flap 3a can be easily and reliably inserted into the first notch 12 .

The inclination angle α of the first inclined edge 12a with respect to the leading edge of the bottom inner flap 4 (the inclination angle of the first inclined edge 12a with respect to an imaginary line parallel to the lower edge of the width panel 2) is the first angle with respect to the leading edge of the bottom inner flap 4. of the second inclined edge 13a (an inclined angle of the second inclined edge 13a with respect to an imaginary line parallel to the lower edge of the width panel 2).

The lower limit of the inclination angle α is preferably 30°, more preferably 40°. On the other hand, the upper limit of the inclination angle α is preferably 60°, more preferably 50°. Also, the inclination angle α may be 45°. If the inclination angle α is less than the above lower limit, the depth of the first notch 12 cannot be sufficiently increased, and the engagement between the first notch 12 and the corner portion 11a may become insufficient. . Conversely, if the inclination angle α exceeds the upper limit, there is a high possibility that the first outer bottom flap 3a and the second outer bottom flap 3b will interfere when the bottom of the box 20 is assembled.

The lower limit of the length D1 of the first inclined edge 12a in the direction parallel to the leading edge of the bottom inner flap 4 is preferably 5 times the sheet thickness, more preferably 7 times the sheet thickness. On the other hand, the upper limit of the length D1 is preferably 12 times the sheet thickness, more preferably 10 times the sheet thickness. If the length D1 is less than the lower limit, there is a high possibility that the first outer bottom flap 3a and the second outer bottom flap 3b will interfere when the bottom of the box 20 is assembled. Conversely, if the length D1 exceeds the upper limit, the first notch 12 may become too large, or the engagement between the first notch 12 and the corner portion 11a may become insufficient.

[Second notch]
The corner portion 11 b of the second bottom outer flap 3 b is inserted into the second notch 13 .

As described above, the second notch 13 has the second inclined edge 13a inclined toward the tip edge side of the bottom inner flap 4 and the first notch 12 side. The second inclined edge 13a is linear. One or both ends of the second inclined edge 13a may be rounded. The second notch 13 also has a second support edge 13b that is connected to the tip side of the second inclined edge 13a in the depth direction and extends perpendicularly to the tip edge of the inner bottom flap 4 . The second support edge 13 b extends continuously from the tip side of the second inclined edge 13 a in the depth direction and reaches the tip edge of the inner bottom flap 4 . That is, the second notch 13 has a right triangle shape with the second inclined edge 13a as the oblique side and the second supporting edge 13b as the adjacent side. The depths of the first notch 12 and the second notch 13 are equal.

Both the second inclined edge 13a and the second support edge 13b are cutting edges. That is, the second notch 13 is formed by removing a part of the tip side of the inner bottom flap 4 . By being formed in this way, the corner portion 11b of the second bottom outer flap 3b can be inserted into the second notch 13 easily and reliably.

The lower limit of the difference (β-α) in the inclination angle between the first inclined edge 12a and the second inclined edge 13a with respect to the leading edge of the bottom inner flap 4 is preferably 10°, more preferably 15°. On the other hand, the upper limit of the tilt angle difference (β-α) is preferably 30°, more preferably 25°. If the difference in inclination angle (β−α) is less than the lower limit, there is a high possibility that the first bottom outer flap 3a and the second bottom outer flap 3b will interfere when the bottom of the box 20 is assembled. Conversely, if the difference in inclination angle (β−α) exceeds the upper limit, the first notch 12 may become too large, the depth of the first notch 12 may not be sufficiently large, The engagement between the first notch 12 and the corner portion 11a may be insufficient. On the other hand, since the difference in inclination angle (β-α) is within the above range, the first bottom outer flap 3a inserted into the first notch 12 and the second flap 3a inserted into the second notch 13 While sliding the outer bottom flap 3b with the first inclined edge 12a and the second inclined edge 13a, it is possible to more easily arrange the inner surface of the inner bottom flap 4 while shifting the timing.

The distance between the end of the first inclined edge 12a on the tip side in the depth direction and the side edge of the inner bottom flap 4 adjacent to the first inclined edge 12a, and the edge on the tip side in the depth direction of the second inclined edge 13a and the side edge of the bottom inner flap 4 adjacent to the second inclined edge 13a is preferably equal. With this configuration, the first outer bottom flap 3a inserted into the first notch 12 and the second outer bottom flap 3b inserted into the second notch 13 are separated from each other by the first inclined edge 12a and the second outer flap 3b. 2 While sliding with the inclined edge 13a, it can be easily arranged on the inner surface of the bottom inner flap 4 while shifting the timing.

The difference (D1- The lower limit of D2) is preferably 1.5 times the sheet thickness, more preferably 2 times the sheet thickness. On the other hand, the upper limit of the difference (D1-D2) is preferably four times the sheet thickness, more preferably three times the sheet thickness. If the difference (D1-D2) is less than the lower limit, there is a high possibility that the first bottom outer flap 3a and the second bottom outer flap 3b will interfere when the bottom of the box 20 is assembled. Conversely, if the difference (D1-D2) exceeds the upper limit, it may be difficult to form the first notch 12 and the second notch 13 with appropriate sizes.

[Formation process of the bottom of the box]
A process of forming the bottom of the box 20 with the box sheet 10 will be described in detail. As shown in FIG. 4, the box sheet 10 has a corner portion 11a of the first bottom outer flap 3a inserted into the first notch 12 and a second notch portion 11b of the second bottom outer flap 3b. 13, when the first and second bottom flaps 3a and 3b are released from being pushed in, the pair of bottom flaps 3a and 3b are returned in the horizontal direction by the reaction force of the sheet. In order to return the outer bottom flaps 3a and 3b to the horizontal direction, for example, one or both of the outer bottom flaps 3a and 3b may be pressed from above.). At this time, the first outer bottom flap 3a slides between the corner portion 11a and the first inclined edge 12a, and the second outer bottom flap 3b slides between the corner portion 11b and the second inclined edge 13a. is returned to the horizontal direction. Here, the difference in the angle of inclination between the first slanted edge 12a and the second slanted edge 13a allows the timing at which the first outer bottom flap 3a overlaps the inner surface of the inner bottom flap 4 and the second outer bottom flap 3b. overlaps with the inner surface of the bottom inner flap 4 . More specifically, as shown in FIG. 5, the pair of bottom outer flaps 3a and 3b overlap the inner surface of the bottom inner flap 4 in order so that the first bottom outer flap 3a slips under the second bottom outer flap 3b. . As a result, the bottom portion can be easily formed while suppressing interference between the pair of bottom outer flaps 3a and 3b.

(Lid outer flap)
The lid outer flap 5 has a substantially rectangular shape. Also, the pair of lid outer flaps 5 have substantially the same shape. The width of the lid outer flap 5 is substantially equal to the length of the length panel 1 in the left-right direction. The length of the lid outer flap 5 in the extending direction is approximately 1/2 of the length of the width panel 2 in the left-right direction.

(Flap inside the lid)
The lid inner flap 6 has a substantially rectangular shape. Also, the pair of inner lid flaps 6 have substantially the same shape. The width of the inner lid flap 6 is substantially equal to the length of the width panel 2 in the left-right direction. The extension direction length of the inner lid flap 6 can be the same as the extension direction length of the outer lid flap 5 .

<Advantages>
In the box sheet 10, the inclination angles of the first inclined edge 12a and the second inclined edge 13a are different so that the pair of outer bottom flaps 3a and 3b are superimposed on the pair of inner bottom flaps 4 with a time lag. Therefore, the bottom of the box 20 can be easily assembled.

According to the box sheet 10, the first bottom outer flap 3a inserted into the first notch 12 and the second bottom outer flap 3b inserted into the second notch 13 shift the timing to form the bottom inner flap 4. easily placed on the inner surface of the Therefore, the length in the extension direction of the pair of bottom outer flaps 3a, 3b is equal, and the length in the extension direction of the pair of bottom outer flaps 3a, 3b is more than half the length of the width panel 2 in the left-right direction. Also, the pair of bottom outer flaps 3a and 3b can be superimposed on the inner surfaces of the pair of bottom inner flaps 4 while suppressing interference between the pair of bottom outer flaps 3a and 3b. As a result, while assembling the bottom of the box 20 easily, by partially overlapping the pair of bottom outer flaps 3a and 3b at the bottom, the bottom of the bottom can be easily suppressed.

The box sheet 10 includes a reduced-width portion 14a in which side edges on both sides of the bottom outer flaps 3a and 3b extend at an angle inward in the width direction from the base end side to the tip end side, and the reduced-width portion 14a. It has a widened portion 15a disposed on the tip side and extending obliquely outward in the width direction toward the tip edges of the bottom outer flaps 3a, 3b. The corners 11a and 11b can be easily and reliably inserted into the first notch 12 and the second notch 13 by the opening.

[Other embodiments]
The above embodiments do 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 interpreted as belonging to the scope of the present invention. should.

As described above, the first notch and the second notch are preferably formed by removing part of the tip side of the inner bottom flap. However, the first notch and the second notch can also be formed, for example, by bending a tongue piece formed on the inner bottom flap.

As described above, the box sheet is suitable for suppressing the bottom of the box by partially overlapping the pair of bottom outer flaps. However, the extension direction length of the pair of bottom outer flaps can be changed according to the use of the box.

The specific shape and arrangement of the first notch and the second notch are not limited to the configuration of the above embodiment. For example, the first notch and the second notch may have different depths.

The specific shape of the bottom outer flap is not limited to the configuration of the above embodiment.

In the box sheet, the specific configuration for forming the lid of the box is not particularly limited.

As described above, the box sheet according to one aspect of the present invention is suitable for facilitating the assembly of the bottom of the box.

1 Length panel 2 Width panel 3a First bottom outer flap 3b Second bottom outer flap 4 Bottom inner flap 5 Lid outer flap 6 Inner lid flap 7 Passage 10 Box sheet 11a, 11b Corner 12 First notch 12a First inclined edge 12b First supporting edge 13 Second notch 13a Second inclined edge 13b Second supporting edge 14 Base part 14a Reduced width part 15 Tip part 15a Widened part 20 Box body X Sealing tape α Leading edge of bottom inner flap Inclination angle β of the first inclined edge with respect to the leading edge of the in-bottom flap D1 Inclination angle of the second inclined edge with respect to the leading edge of the in-bottom flap D1 Length of the first inclined edge in a direction parallel to the leading edge of the in-bottom flap D2 length of the second beveled edge in parallel directions

Claims (5)

a pair of length side panels and a pair of width side panels facing each other in an assembled state;
a pair of bottom outboard flaps extending from the lower edges of the pair of longitudinal panels;
A box sheet assembled into a box body, comprising a pair of bottom inner flaps extending from the lower edges of the pair of width panels,
A first notch into which the leading end side corner of one of the bottom outer flaps is inserted and a second notch into which the leading end side corner of the other of the bottom outer flaps is inserted into the leading edge of each of the bottom inner flaps. is provided,
The first notch has a first inclined edge that is inclined toward the tip edge side of the bottom inner flap in which the first notch is provided and the second notch side,
The second notch has a second inclined edge that is inclined toward the leading edge side of the bottom inner flap in which the second notch is provided and the first notch side,
A sheet for a box, wherein the inclination angles of the first inclined edge and the second inclined edge are different so that the pair of outer bottom flaps are superimposed on the pair of inner bottom flaps with a time lag. The pair of bottom outer flaps are equal in length in the extending direction, and the length in the extending direction of the pair of bottom outer flaps is greater than 1/2 of the length in the lateral direction of the width panel. Sheet for box described. The distance between the end of the first inclined edge on the tip side in the depth direction and the side edge of the in-bottom flap adjacent to the first inclined edge, and the end of the second inclined edge on the tip side in the depth direction. 3. The box sheet according to claim 1 or 2, wherein the spacing between said second slanted edge and the side edge of said bottom inner flap adjacent thereto is equal. 3. The box sheet according to claim 1, wherein a difference in inclination angle between the first inclined edge and the second inclined edge with respect to the tip edge of the inner bottom flap is 10[deg.] or more and 30[deg.] or less. a reduced width portion in which the side edges on both sides of the bottom outer flap extend obliquely inward in the width direction from the base end toward the distal end; a widened portion extending obliquely outward in the width direction toward the tip edge,
3. The box sheet according to claim 1, wherein the corners are provided at the widened portions.

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