JP6779404B1 - Box sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a box sheet which can be easily assembled into a box body having an opening on the upper surface and a notch continuous with the opening on an end face panel. A box sheet according to an aspect of the present invention has a pair of first folded flaps extending from an upper edge of a pair of side panels, and a pair of first folded flaps of the side panels. A top surface that can be bent vertically inward, a folded part that extends from the tip edge of the top surface and is folded back in parallel with the side panel, and a folded part that extends from the side edge of the folded part on the first end surface panel side, and the side panel and the folded part It has a sub-flap that is folded between the two, and the tip edges of the sub-flap formed on the pair of first folded flaps are temporarily connected to each other by a first breakable line so as to be breakable. [Selection diagram] Fig. 1

Description

The present invention relates to a box sheet.

A box body made by assembling a box sheet composed of a corrugated cardboard sheet is used as a container for displaying articles. As the box body, a box having an opening on the upper surface and having a notch continuous with the opening on the front panel has been proposed so that the article can be visually recognized and easily taken out. Japanese Patent Application Laid-Open No. 2001-301748).

Japanese Unexamined Patent Publication No. 2001-301748

The corrugated cardboard box described in the above publication includes a front panel, a back panel, a pair of side panels, a pair of connecting panels extending from the upper edge of the pair of side panels, and a pair of connecting panels that are horizontally bent. It is provided with a pair of inner panels extending from the tip edge of the front panel and folded back toward the inner surface side of the pair of side panels, and the upper portion of the front panel is cut out and the upper surface is open. This cardboard box is configured so that other cardboard boxes can be stacked on a pair of connecting panels.

The cardboard box is formed from a front panel, a pair of side panels connected to the side edges of the front panel, a pair of connecting panels extending from the upper edge of the pair of side panels, and a pair of connecting panels from the tip edge. Assembled using a corrugated cardboard sheet with a pair of extending inner panels.

In this corrugated cardboard sheet, the upper part of the front panel is cut out, and a space for forming an upper opening is provided above the front panel. Therefore, it may be difficult to assemble the corrugated cardboard box because the strength of the front panel at the time of assembly is insufficient for this corrugated cardboard sheet.

The present invention has been made in view of such circumstances, and is a box sheet that can be easily assembled into a box body having an opening on the upper surface and a notch continuous with the opening on the end face panel. The purpose is to provide.

The box sheet according to one aspect of the present invention includes a first side panel, a first end panel, a second side panel, and a second end panel which are connected from one side to the other in the left-right direction and assembled into a square cylinder. A tray-like structure provided with a pair of first folded flaps extending from the upper edges of the first side panel and the second side panel, and a second folded flap extending from the upper edge of the second end surface panel. A box sheet that can be assembled into a box body, in which the first end surface panel has a U-shaped portion having a pair of left and right pillar portions extending in the vertical direction and a base portion connecting the lower portions of the pair of pillar portions. It has a main body and a folded piece that extends from the upper edge of the base and is folded back toward the inner surface side of the base, and the pair of first folded flaps form an upper edge of the first side panel and the second side panel. A top surface portion extending from the first side panel and vertically bent inside the second side surface panel, and an inner surface side of the first side surface panel and the second side surface panel extending from the tip edge of the top surface portion. A folded portion that is folded back in parallel with the first side panel and the second side panel, and a folded portion that extends from the side edge of the folded portion on the side of the first end surface panel, and the first side panel and the second side panel. It has a sub-flap that is folded between the folded-back portion, and the tip edges of the sub-flaps formed on the pair of first folded-back flaps are temporarily connected to each other by a first breakable line.

The box sheet according to one aspect of the present invention can be easily assembled into a box body having an opening on the upper surface and a notch continuous with the opening on the end face panel.

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 showing a box body formed by assembling the box sheet of FIG. 1. FIG. 3 is a schematic plan view of the box body of FIG. FIG. 4 is a sectional view taken along line IV-IV of the box body of FIG. FIG. 5 is a schematic perspective view showing a procedure for assembling the box body of FIG. 2 from the box sheet of FIG. FIG. 6 is a schematic perspective view showing the following procedure of FIG. 5 for assembling the box body of FIG. 2 from the box sheet of FIG. FIG. 7 is a schematic plan view showing a box sheet according to an embodiment different from that of the box sheet of FIG. FIG. 8 is a schematic plan view showing a box body formed by assembling the box sheet of FIG. 7. FIG. 9 is a sectional view taken along line IX-IX 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 includes a first side panel, a first end panel, a second side panel, and a second end panel which are connected from one side to the other in the left-right direction and assembled into a square cylinder. A tray-like structure provided with a pair of first folded flaps extending from the upper edges of the first side panel and the second side panel, and a second folded flap extending from the upper edge of the second end surface panel. A box sheet that can be assembled into a box body, in which the first end surface panel has a U-shaped portion having a pair of left and right pillar portions extending in the vertical direction and a base portion connecting the lower portions of the pair of pillar portions. It has a main body and a folded piece that extends from the upper edge of the base and is folded back toward the inner surface side of the base, and the pair of first folded flaps form an upper edge of the first side panel and the second side panel. A top surface portion extending from the first side panel and vertically bent inside the second side surface panel, and an inner surface side of the first side surface panel and the second side surface panel extending from the tip edge of the top surface portion. A folded portion that is folded back in parallel with the first side panel and the second side panel, and a folded portion that extends from the side edge of the folded portion on the side of the first end surface panel, and the first side panel and the second side panel. It has a sub-flap that is folded between the folded-back portion, and the tip edges of the sub-flaps formed on the pair of first folded-back flaps are temporarily connected to each other by a first breakable line.

In the box sheet, the main body of the first end face panel is U-shaped, and the pair of first folded flaps are bent vertically inside the first side panel and the second side panel. Since the first side panel and the inner surface side of the second side panel have a folded portion that is folded back in parallel with the first side panel and the second side panel, the upper part of the first end surface panel is formed. It is notched and the upper surface is open, and other boxes can be assembled into a tray-shaped box that can be stacked on the top surface. In the box sheet, the pair of first folded flaps have sub-flaps extending from the side edges of the folded portion on the first end surface panel side, and are formed on the pair of first folded flaps. Since the tip edges of the sub-flaps are temporarily connected to each other so as to be breakable by the first easy-to-break line, the box body can be easily assembled using a box-making machine. Specifically, the box sheet can be easily assembled into a square cylinder using a box making machine in a state where the tip edges of the pair of the sub flaps are temporarily connected to each other. Further, in the box sheet, since the sub flap is folded between the first side panel and the second side panel and the folded portion, the pressure resistance strength of the box body can be increased by this sub flap. That is, the box sheet has a sub flap extending from the side edge of the folded portion on the first end surface panel side, and the tip edges of the sub flaps formed on the pair of the first folded flaps are connected to each other. Is temporarily connected so as to be breakable by the first breakable line, so that both the ease of assembling the box body and the pressure resistance strength of the box body can be enhanced.

The box sheet may further include a pair of tongue pieces extending from the upper edge of the pair of pillars and temporarily connected to the pair of sub-flaps by a second easy line for breaking. As described above, the box sheet further includes a pair of tongue pieces extending from the upper edge of the pair of pillars and temporarily connected to the pair of sub flaps by a second easy line for breaking. The first end face panel and the pair of sub flaps are temporarily connected via the pair of tongue pieces. Thereby, the box body can be assembled more easily and surely.

The box sheet may include a separable area surrounded by the folded piece, the pair of pillars, the pair of tongue pieces, and the pair of sub flaps. As described above, the box sheet can be made easier by providing the detachable area surrounded by the folded piece, the pair of pillars, the pair of tongue pieces, and the pair of sub flaps. It can be assembled reliably.

The sub-flap may have a first portion that is folded over the inner surface of the pillar portion and a second portion that is folded over the inner surface of the first side surface panel or the second side surface panel. In this way, the sub-flap has a first portion that is folded over the inner surface of the pillar portion and a second portion that is folded over the inner surface of the first side surface panel or the second side surface panel. The posture of the above sub-flap is stable when assembled on the body. As a result, the shape of the box body becomes more stable.

The sub-flap may be configured so as to be able to be pressed between the tongue piece and the folded-back portion at the time of assembly. As described above, since the sub-flap is configured to be able to be pressed between the tongue piece and the folded-back portion at the time of assembly, the posture of the folded-back portion in the box body can be maintained more stably. .. As a result, the pressure resistance of the box body can be easily increased.

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, "upper" means an upper part based on the left-right direction, and "lower" means a lower part based on the left-right direction. The "U-shape" includes a square U-shape and a shape similar to a square U-shape.

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

[First Embodiment]
The box sheet 10 of FIG. 1 is composed of one sheet. The box sheet 10 includes a first side panel 1, a first end panel 2, a second side panel 3, and a second end panel 4, which are connected from one side to the other in the left-right direction and assembled into a square cylinder. It includes a pair of first folded flaps 5 extending from the upper edges of the first side panel 1 and the second side panel 3, and a second folded flap 6 extending from the upper edge of the second end surface panel 4. Further, the box sheet 10 includes a glue margin 7 extending from the lateral outer edge of the first side panel 1 in the left-right direction, and a first bottom outer flap 8a extending from the lower edge of the first side panel 1. A first bottom inner flap 9a extending from the lower edge of the first end surface panel 2, a second bottom outer flap 8b extending from the lower edge of the second side surface panel 3, and extending from the lower edge of the second end surface panel 4. It is provided with a second bottom inner flap 9b to be put out. Further, the box sheet 10 extends from the upper edge of the first end surface panel 2, and is temporarily connected to the pair of first folded flaps 5, a pair of tongue pieces 11, the first end surface panel 2, and a pair of first. It includes a folded flap 5 and a detachable region 12 surrounded by a pair of tongue pieces 11. In FIG. 1, a thick solid line indicates a cutting line formed by cutting a sheet, and a thin solid line indicates a ruled line formed by pressing one side of the sheet.

The box sheet 10 can be assembled into a tray-shaped box, specifically, the box 30 of FIGS. 2 and 3 in which the upper portion of the first end surface panel 2 is cut out and the upper surface is open. Assembled in. The box body 30 is used as a container for displaying articles in a state where, for example, an article is housed and is transported in a state of being covered with a shrink film, and the shrink film is peeled off.

The sheet material 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 30 formed by assembling the box sheet 10, and is not particularly limited, for example, a corrugated cardboard sheet or cardboard. Such as 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. The corrugated cardboard sheet forming the box sheet 10 is a corrugated cardboard sheet in which a core formed of a base paper in a wavy shape is bonded to a liner. For example, a core formed in a wave shape is bonded to a single 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 the single-sided 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.

(1st side panel and 2nd side panel)
The first side panel 1 and the second side panel 3 each have a substantially rectangular shape. The lengths of the first side panel 1 and the second side panel 3 in the vertical direction are equal. Further, the lengths of the first side panel 1 and the second side panel 3 in the left-right direction are equal. The first side panel 1 and the second side panel 3 have a large horizontal length with respect to the vertical length. Further, the left-right lengths of the first side panel 1 and the second side panel 3 are larger than the left-right lengths of the first end face panel 2 and the second end face panel 4. The length of the first side panel 1 and the second side panel 3 in the left-right direction can be appropriately set based on the size of the articles to be housed in the box 30, but can be, for example, 30 cm or more and 60 cm or less. .. The vertical lengths of the first side panel 1 and the second side panel 3 can be appropriately set based on the size of the articles housed in the box 30, and can be, for example, 10 cm or more and 40 cm or less. ..

The first side panel 1 and the second side panel 3 (hereinafter, the first side panel 1 and the second side panel 3 are collectively referred to as "side panels 1 and 3") have convex portions 1a and 3a on the upper edge. .. The convex portions 1a and 3a are provided so as to be able to engage with or interfere with the first locking holes 19d and 20d described later of the other box bodies 30 to be stacked on the upper side when the plurality of box bodies 30 are stacked.

(1st end panel)
The first end surface panel 2 has a U-shaped main body 13 having a pair of left and right pillar portions 13a extending in the vertical direction and a base portion 13b connecting the lower portions of the pair of pillar portions 13a, and extends from the upper edge of the base portion 13b. It has a folded piece 14 which is taken out and folded back to the inner surface side of the base portion 13b. Side panels 1 and 3 are connected to the outer side edges of the pair of pillars 13a in the left-right direction. The vertical length of the first end surface panel 2 is defined by the vertical length of the pair of column portions 13a. The length of the first end surface panel 2 in the left-right direction is defined by the distance between the lateral edges of the pair of pillars 13a in the left-right direction. The vertical length of the first end surface panel 2 is substantially equal to the vertical length of the pair of side panels 1 and 3.

The folded piece 14 extends from the upper edge of the base portion 13b and is bent vertically inside the base portion 13b, and extends from the tip edge of the connecting portion 14a and is folded back parallel to the base portion 13b on the inner surface side of the base portion 13b. It has a main body portion 14b to be mounted. A convex portion 14c that can be engaged with the second locking hole 21b, which will be described later, is provided on the tip edge of the main body portion 14b.

(2nd end panel)
The second end face panel 4 has a substantially rectangular shape. The left-right length of the second end face panel 4 is equal to the left-right length of the first end face panel 2. The vertical length of the second end face panel 4 is equal to the vertical length of the first end face panel 2.

(1st folded flap)
The pair of first folded flaps 5 together with the side panels 1 and 3 form a pair of side walls 31 of the box body 30.

The pair of first folded flaps 5 extend from the upper edges of the side panels 1 and 3 and are bent vertically inside the side panels 1 and 3 (first top surface portion 5a) and the first top surface portion 5a. A folded portion (first folded portion 5b) extending from the tip edge and folded back in parallel with the side panels 1 and 3 on the inner surface side of the side panels 1 and 3, and a side of the first folded portion 5b on the first end surface panel 2 side. It has a sub-flap 5c that extends from the edge and is folded between the side panels 1, 3 and the first folded portion 5b. The tip edges of the sub flaps 5c formed on the pair of first folded flaps 5 are temporarily connected to each other by a first breakable line 15 so as to be breakable. In other words, the pair of first folded flaps 5 are temporarily connected by the first easy-to-break line 15 to form one flap as a whole.

[Top surface]
The first top surface portion 5a has a substantially rectangular shape having a large width with respect to the length L in the extending direction. The first top surface portion 5a is connected to the side panels 1 and 3 at the base end edge, and is connected to the first folded portion 5b at the tip end edge. On the other hand, both side edges of the first top surface portion 5a in the width direction are not connected to other panels or the like. That is, both side edges of the first top surface portion 5a in the width direction are cutting edges.

The first top surface portion 5a extends from substantially the entire area of the upper edge of the side panels 1 and 3. That is, the width of the first top surface portion 5a is substantially equal to the length in the left-right direction of the side panels 1 and 3.

The first top surface portion 5a constitutes a support portion for supporting the other box body 30 from below when stacking the other box body 30 in the box body 30. The lower limit of the length L of the first top surface portion 5a in the extending direction is preferably 3 cm, more preferably 4 cm. If the extension direction length L does not reach the lower limit, the other boxes 30 may not be stably stacked. Further, in the box sheet 10, the pressure resistance of the box body 30 can be increased by folding the sub flap 5c between the side panels 1 and 3 and the first folded portion 5b. In this respect, if the extension direction length L does not meet the lower limit, the sub flap 5c may not be arranged in a desired posture between the side panel 1, 3 and the first folded portion 5b. On the other hand, as the upper limit of the extension direction length L, 8 cm is preferable, and 6 cm is more preferable. If the extension direction length L exceeds the upper limit, there is a risk that a sufficient storage space for articles in the box body 30 cannot be secured, and a sub between the side panels 1 and 3 and the first folded portion 5b. The flap 5c becomes easy to move, and it may be difficult to stably arrange the sub flap 5c.

[Folded part]
The first folded portion 5b has a substantially rectangular shape. The first folded-back portion 5b is arranged on the inner surface side of the side panels 1 and 3, and together with the side panels 1 and 3, forms a double wall. The width of the first folded portion 5b is substantially equal to the width of the first top surface portion 5a. The length of the first folded portion 5b in the extending direction is substantially equal to the length of the side panels 1 and 3 in the vertical direction.

The first folded portion 5b is provided with a folding piece 16 defined by an easy-to-fold line and a slit. The folding piece 16 is provided so that a handle hole can be formed in the first folding portion 5b so that the box body 30 can be easily disassembled.

[Sub flap]
The sub flap 5c functions as a reinforcing panel for increasing the pressure resistance of the side wall 31 when assembled in the box body 30. Further, the sub flap 5c functions as an auxiliary panel for easily and surely assembling the box body 30 from the box sheet 10 as described later.

The sub flap 5c has a substantially rectangular shape. The sub flap 5c extends from substantially the entire area of the side edge of the first folded portion 5b. The width W of the sub flap 5c is substantially equal to the vertical length of the side panels 1 and 3. Specifically, the upper limit of the difference between the vertical lengths of the side panels 1 and 3 and the width W of the sub flap 5c can be three times the sheet thickness, and more preferably twice the sheet thickness. ..

The sub flap 5c has a first portion 17a extending from the side edge of the first folded portion 5b and a second portion 17b extending from the tip edge of the first portion 17a. The first portion 17a and the second portion 17b are each substantially rectangular. An easy-to-bend line is provided at the boundary between the first portion 17a and the second portion 17b. As shown in FIG. 4, the first portion 17a is folded over the inner surface of the pillar portion 13a in a state of being assembled into the box body 30. Further, in the state of being assembled in the box body 30, the second portion 17b is folded over the inner surfaces of the side panels 1 and 3. The box sheet 10 has a box body in which the sub flap 5c has a first portion 17a folded on the inner surface of the pillar portion 13a and a second portion 17b folded on the inner surface of the side panels 1 and 3. The posture of the sub-flap 5c in the state of being assembled to 30 is stable. As a result, the shape of the box body 30 becomes more stable.

(2nd folded flap)
The second folded flap 6 has a substantially rectangular shape. The second folded flap 6 extends from the upper edge of the second end face panel 4 and extends vertically from the inside of the second end face panel 4 to the second top surface portion 6a and the tip edge of the second top surface portion 6a. A second folded portion 6b that is folded back in parallel with the second end surface panel 4 on the inner surface side of the second end surface panel 4, and a second folded portion 6b and a second end surface panel 4 that extend from the tip edge of the second folded portion 6b. It has a third folded portion 6c that is folded back between the two.

(Tongue piece)
The pair of tongue pieces 11 extend from the upper edge of the pair of pillar portions 13a and are temporarily connected to the pair of sub flaps 5c by the second breakable line 18. That is, the tongue piece 11 is connected to the pillar portion 13a at the base end edge and temporarily connected to the sub flap 5c at the tip end edge. As a result, the first end surface panel 2 and the pair of sub flaps 5c are temporarily connected via the pair of tongue pieces 11. As a result, it is possible to prevent the pair of sub flaps 5c from swinging independently of the first end surface panel 2, and the box body 30 can be assembled more easily and reliably.

(Detachable area)
The detachable region 12 is surrounded by a folded piece 14, a pair of pillars 13a, a pair of tongue pieces 11, and a pair of sub flaps 5c. That is, the separable region 12 fills the space surrounded by the folded piece 14, the pair of pillars 13a, the pair of tongue pieces 11, and the pair of sub flaps 5c in the box sheet 10. According to this configuration, it is possible to more reliably suppress the pair of sub flaps 5c from swinging independently with respect to the first end surface panel 2, and the box body 30 can be assembled more easily and reliably. In addition, it is possible to prevent the strength of the first end surface panel 2 from becoming insufficient during assembly.

The separable region 12 is temporarily connected to the folded piece 14 and the pair of sub flaps 5c by an easy-to-break line. As a result, in the box sheet 10, the first end surface panel 2 is indirectly temporarily connected to the pair of sub flaps 5c over the entire area in the left-right direction. As a result, the box sheet 10 can assemble the box body 30 more easily and reliably.

(1st bottom outer flap and 2nd bottom outer flap)
The first outer bottom flap 8a has a substantially rectangular shape. A recess 19a is formed at the tip edge of the first bottom outer flap 8a. The second bottom outer flap 8b has a substantially rectangular main body 20a extending from the lower edge of the second side surface panel 3 and a projecting piece 20b extending from the tip edge of the main body 20a.

From the base end side to the tip side on both sides in the width direction of the first bottom outer flap 8a and the second bottom outer flap 8b (more specifically, the main body 20a of the first bottom outer flap 8a and the second bottom outer flap 8b). Easy-to-bend lines 19c and 20c extending inwardly in the width direction are formed. The easily bendable lines 19c and 20c are straight lines.

First locking holes 19d and 20d are formed at the base ends of the first bottom outer flap 8a and the second bottom outer flap 8b along the lower edges of the side panels 1 and 3. The first locking holes 19d and 20d can engage with or interfere with the convex portions 1a and 3a of the other box body 30 when they are stacked on the other box body 30 in the state of being assembled in the box body 30. It is configured in.

(1st bottom flap and 2nd bottom flap)
The first bottom inner flap 9a and the second bottom inner flap 9b are arranged inside the first bottom outer flap 8a and the second bottom outer flap 8b in a state of being assembled in the box body 30. The first bottom inner flap 9a and the second bottom inner flap 9b have a substantially rectangular shape. The total length of the first bottom inner flap 9a and the second bottom inner flap 9b in the extending direction is substantially equal to the left-right length of the side panels 1 and 3. As a result, the first bottom inner flap 9a and the second bottom inner flap 9b are held in a state where the tip edges are butted against each other in the state of being assembled in the box body 30. As a result, the inner surface of the bottom of the box 30 is kept flat.

The first bottom inner flap 9a has a pair of bent pieces 21a at both corners in the width direction on the tip side. The bent piece 21a is defined by an easy-to-bend line parallel to the base end edge of the first bottom inner flap 9a and a slit connecting the end of the easy-to-bend line and the tip edge of the first bottom inner flap 9a. The width of the bent piece 21a is substantially equal to the extension direction length L of the first top surface portion 5a. As shown in FIG. 4, the bent piece 21a is raised upward in a state of being assembled in the box body 30. As a result, the bent piece 21a functions as a stopper for preventing the lower portion of the first folded portion 5b from tilting toward the side panels 1 and 3.

A second locking hole 21b is formed at the base end of the first bottom inner flap 9a along the lower edge of the first end surface panel 2. The above-mentioned convex portion 14c provided on the folded piece 14 is inserted into the second locking hole 21b in a state of being assembled in the box body 30.

(Assembly procedure)
Next, an example of a procedure for assembling the box sheet 10 into the box body 30 will be described with reference to FIGS. 5 and 6.

First, the first side surface panel 1 is folded into the inner surface of the first end surface panel 2 in a state where the first breakable line 15 and the second breakable line 18 are not broken and the separable region 12 is not separated. The second end surface panel 4 is folded over on the inner surface of the second side surface panel 3, and the glue margin 7 is attached to the inner surface of the second end surface panel 4.

Subsequently, as shown in FIG. 5, the first side surface panel 1, the first end surface panel 2, the second side surface panel 3, and the second end surface panel 4 connected in an endless manner are spread out in a square tubular shape. At this time, since the tip edges of the pair of sub flaps 5c are temporarily connected to each other by the first easy-to-break line 15, the first side surface panel 1, the first end surface panel 2, the second side surface panel 3, and the second end surface panel 4 Can be easily expanded into a square cylinder using a box making machine. That is, if the pair of sub flaps 5c are separated from each other or the pair of sub flaps 5c is not formed, the edge of the box sheet is caught in the box making machine, causing troubles in the box making machine or defective box body. Is likely to occur. On the other hand, since the tip edges of the pair of sub flaps 5c are temporarily connected to each other, the box sheet 10 is prevented from being caught in the box making machine, and the first side surface panel 1, the first end surface panel 2, and the first 2 The side surface panel 3 and the second end surface panel 4 can be easily expanded into a square cylinder. Further, in the box sheet 10, since the first end surface panel 2 and the pair of sub flaps 5c are temporarily connected via the tongue piece 11 and the separable area 12, the pair of sub flaps 5c are connected to the first end surface panel. It is difficult to swing independently of 2. As a result, the box sheet 10 can more reliably reduce troubles in the box making machine and defects in the box body 30.

Next, as shown in FIG. 6, the first bottom inner flap 9a and the second bottom inner flap 9b are bent inward, and the first bottom outer flap 8a and the second bottom outer flap 8b are bent inward to form a box body. Assemble the bottom of 30. Further, the first breakable line 15 and the second breakable line 18 are broken, and the separable region 12 is cut off.

The procedure for assembling the bottom of the box body 30 will be described more specifically. First, the first bottom inner flap 9a and the second bottom inner flap 9b are bent inward substantially vertically. Subsequently, the first bottom outer flap 8a is bent substantially vertically inward, and the second bottom outer flap 8b is further folded on the outer surface side of the first bottom outer flap 8a. Then, the second bottom outer flap 8b is pushed in while being pressed against the outer surface of the first bottom outer flap 8a. At this time, the pair of easy-to-bend lines 19c provided on the first outer flap 8a and the pair of easy-to-bend lines 20c provided on the second outer flap 8b are bent appropriately to facilitate the second outer flap 8b. Can be pushed into. After pushing the tip edge of the projecting piece 20b of the second bottom outer flap 8b until it passes through the recess 19a of the first bottom outer flap 8a, the pushing of the second bottom outer flap 8b is released. As a result, the reaction force of the sheet material pushes back the first bottom outer flap 8a and the second bottom outer flap 8b, and in this process, the projecting piece 20b enters the inside of the recess 19a. As a result, the first outer flap 8a and the second outer flap 8b are connected to each other. After the first bottom outer flap 8a and the second bottom outer flap 8b are connected, a pair of bent pieces 21a provided on the first bottom inner flap 9a are raised substantially vertically upward. As a result, the bottom of the box body 30 is assembled.

After the bottom of the box 30 is assembled, the first breakable line 15 and the second breakable line 18 are broken, and the separable region 12 is cut off, the second folded flap 6 is attached to the second end face panel 4 Fold back to the inner surface side of. Further, the folded piece 14 is folded back toward the inner surface side of the first end surface panel 2, and the convex portion 14c provided on the folded piece 14 is inserted into the second locking hole 21b provided at the base end portion of the first bottom inner flap 9a. To do.

Subsequently, after the pair of tongue pieces 11 are bent vertically inside the pair of pillar portions 13a, the pair of first top surface portions 5a are bent vertically inside the side panels 1 and 3, and further, the pair of first folded portions are further bent. The 5b is folded back on the inner surface side of the side panels 1 and 3 in parallel with the side panels 1 and 3. At this time, the first portion 17a of the sub flap 5c is folded over the inner surface of the pillar portion 13a, and the second portion 17b is folded over the inner surface of the side panels 1 and 3. As a result, the inner surfaces of the pair of first folded portions 5b are supported by the folded pieces 14, and the outer surfaces of the pair of first folded portions 5b are supported by the pair of bent pieces 21a, so that the pair of first folded portions 5b Is maintained parallel to the side panels 1 and 3.

<Advantage>
In the box sheet 10, the main body 13 of the first end surface panel 2 is U-shaped, and a pair of first folded flaps 5 are bent vertically inside the side panels 1 and 3, and a first top surface portion 5a. Since the inner surface side of the side panels 1 and 3 has the first folded portion 5b that is folded back in parallel with the side panels 1 and 3, the upper portion of the first end surface panel 2 is cut out and the upper surface is opened. It is possible to assemble another box body 30 into a tray-shaped box body 30 that can be stacked on the pair of first top surface portions 5a. The box sheet 10 has a pair of first folded flaps 5 having sub flaps 5c extending from the side edges of the first folded portion 5b on the first end surface panel 2 side, and the pair of sub flaps 5c. Since the tip edges are temporarily connected to each other by the first breakable line 15 so as to be breakable, the box body 30 can be easily assembled using a box making machine. Further, in the box sheet 10, since the sub flap 5c is folded between the side panels 1 and 3 and the first folded portion 5b when the box body 30 is assembled, the pressure resistance strength of the box body 30 is increased by the sub flap 5c. Can be enhanced. That is, the box sheet 10 has a sub flap 5c extending from the side edge of the first folded-back portion 5b on the first end surface panel 2 side, and the tip edges of the pair of sub flaps 5c are first broken. By temporarily connecting the box body 30 so as to be breakable by the easy wire 15, both the ease of assembling the box body 30 and the pressure resistance strength of the box body 30 can be enhanced.

[Second Embodiment]
The box sheet 40 of FIG. 7 is connected from one side in the left-right direction to the other side and assembled into a square tubular shape: a first side panel 1, a first end panel 2, a second side panel 3, and a second end panel 4. A pair of first folded flaps 45 extending from the upper edges of the first side panel 1 and the second side panel 3 and a second folded flap 6 extending from the upper edges of the second end surface panel 4 are provided. Further, the box sheet 40 includes a glue allowance 7 extending from the lateral outer edge of the first side panel 1 in the left-right direction, and a first bottom outer flap 8a extending from the lower edge of the first side panel 1. A first bottom inner flap 9a extending from the lower edge of the first end surface panel 2, a second bottom outer flap 8b extending from the lower edge of the second side surface panel 3, and extending from the lower edge of the second end surface panel 4. It is provided with a second bottom inner flap 9b to be put out. Further, the box sheet 40 extends from the upper edge of the first end surface panel 2 and is temporarily connected to the pair of first folded flaps 45, the pair of tongue pieces 11, the first end surface panel 2, and the pair of first. It includes a folded flap 45 and a detachable region 12 surrounded by a pair of tongue pieces 11.

The first end surface panel 2 has a U-shaped main body 13 having a pair of left and right pillar portions 13a extending in the vertical direction and a base portion 13b connecting the lower portions of the pair of pillar portions 13a, and extends from the upper edge of the base portion 13b. It has a folded piece 14 which is taken out and folded back to the inner surface side of the base portion 13b.

The pair of first folded flaps 45 extend from the upper edges of the side panels 1 and 3 and extend vertically from the tip edges of the first top surface portion 5a and the first top surface portions 5a which are bent vertically inside the side panels 1 and 3. The first folded portion 5b that is extended and folded back in parallel with the side panels 1 and 3 on the inner surface side of the side panels 1 and 3 and the side edge of the first folded portion 5b on the first end surface panel 2 side are extended from the side panel 1 It has a sub flap 45c that is folded between the 3 and the 1st folded portion 5b. The box sheet 40 can have the same configuration as the box sheet 10 of FIG. 1 except that the sub flap 45c does not have the first portion and the second portion.

The box sheet 40 is assembled into the box body 50 of FIG. As shown in FIGS. 8 and 9, in the box body 50, the sub flap 45c is sandwiched between the tongue piece 11 and the first folded portion 5b. As a result, in the box body 50, the pair of first folded portions 5b are pressed from the outside by the tongue piece 11 via the sub flap 45c, while being supported from the inside by the folded piece 14.

<Advantage>
Since the box sheet 40 is configured so that the sub flap 45c can be pressed between the tongue piece 11 and the first folded portion 5b, the posture of the first folded portion 5b in the box body 50 is more stable. Can be kept. As a result, the withstand voltage strength of the box body 50 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 as belonging to the scope of the present invention. Should be.

For example, it is preferable that the pair of tongue pieces are temporarily connected to the pair of sub flaps, but these tongue pieces can be separated from the pair of sub flaps. In addition, the box sheet can omit the pair of tongue pieces.

The box sheet can also be punched out from the above-mentioned separable area. However, in order to assemble the box more reliably, it is preferable that the separable area is temporarily connected to the folded piece and the pair of sub flaps so that the box can be separated during the assembly.

The specific configuration for forming the bottom of the box is not particularly limited. The box sheet may form the bottom of a so-called one-touch type, American lock type, or the like.

As described above, the box sheet according to one aspect of the present invention is suitable for forming a box body having an opening on the upper surface and a notch continuous with the opening on the end face panel.

1 1st side panel 1a, 3a Convex 2 1st end panel 3 2nd side panel 4 2nd end panel 5, 45 1st folded flap 5a 1st top surface 5b 1st folded 5c, 45c Sub flap 6 2nd Folded flap 6a 2nd top surface 6b 2nd folded part 6c 3rd folded part 7 Glue margin 8a 1st bottom outer flap 8b 2nd bottom outer flap 9a 1st bottom inner flap 9b 2nd bottom inner flap 10,40 Box sheet 11 Tongue piece 12 Detachable area 13 Main body 13a Pillar part 13b Base part 14 Folded piece 14a Connection part 14b Main body part 14c Convex part 15 First breakable line 16 Folded piece 17a First part 17b Second part 18 Second breakable line 19a Recesses 19c, 20c Easy-to-bend lines 19d, 20d First locking hole 20a Main body 20b Protruding piece 21a Bending piece 21b Second locking hole 30, 50 Box 31 Side wall L Length in extension direction of first top surface W Sub-flap Width of

Claims (5)

A first side panel, a first end panel, a second side panel, and a second end panel, which are connected from one side to the other in the left-right direction and assembled into a square cylinder.
A pair of first folded flaps extending from the upper edge of the first side panel and the second side panel,
A box sheet that is provided with a second folded flap that extends from the upper edge of the second end surface panel and can be assembled into a tray-shaped box.
The first end surface panel extends from a U-shaped main body having a pair of left and right pillars extending in the vertical direction and a base connecting the lower portions of the pair of pillars, and an upper edge of the base. It has a folded piece that is folded back on the inner surface side of the base,
The pair of first folded flaps extend from the upper edges of the first side panel and the second side panel, and inside the first side panel and the second side panel, the first side panel and the second side panel. A top surface portion that is bent perpendicularly to the side panel, and a first side surface panel and a second side surface panel that extend from the tip edge of the top surface portion and are on the inner surface side of the first side surface panel and the second side surface panel. A folded portion that is folded back in parallel and a sub-flap that extends from the side edge of the folded portion on the first end surface panel side and is folded between the first side panel and the second side panel and the folded portion. Have and
A box sheet in which the tip edges of the sub flaps formed on the pair of first folded flaps are temporarily connected to each other so as to be breakable by the first breakable line. The box sheet according to claim 1, further comprising a pair of tongue pieces extending from the upper edge of the pair of pillars and temporarily connected to the pair of sub flaps by a second easy line for breaking. The box sheet according to claim 2, further comprising a separable area surrounded by the folded piece, the pair of pillars, the pair of tongue pieces, and the pair of sub flaps. Claim 1, claim 2, or claim 2, wherein the sub-flap has a first portion folded over the inner surface of the pillar portion and a second portion folded over the inner surface of the first side surface panel or the second side surface panel. The box sheet according to claim 3. The box sheet according to claim 2 or 3, wherein the sub flap is configured to be able to be pressed between the tongue piece and the folded portion at the time of assembly.

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