JP3227878U - Box sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a box sheet in which a top surface portion of a box body can be easily held flat. SOLUTION: A box sheet 10 has a pair of length surface panels 1 and a pair of end surface panels 2 facing each other in an assembled state, and a pair of length surfaces extending from an upper edge of the pair of length surface panels 1. A trapezoidal base 11 and a base portion are provided with a flap 3 and a pair of end face flaps 4 extending from the upper edge of the pair of end face panels 2, and the pair of end face flaps 4 extend from the upper edge of the end face panel 2. It has a convex portion 12 protruding from the tip edge of 11, and a pair of length surface flaps 3 have a substantially rectangular shape, and the tip of the convex portion 12 on both sides in the width direction of the tip edge is outside in the width direction. It has a pair of notches 13 that can lock a portion, a pair of length surface flaps 3 are bent inside a pair of length surface panels 1, and a pair of end surface flaps 4 are a pair of length surfaces. The convex portion 12 is folded above the flap 2 and locked to the notch 13, so that the box body having the upper opening is assembled. [Selection diagram] Fig. 1

Description

The present invention relates to a box sheet.

As a container for storing agricultural products such as onions and cabbage, a box body assembled from a corrugated cardboard sheet or the like is used. As this box body, a pair of end walls and a pair of side walls facing each other, a pair of end flaps extending from the upper edge of the pair of end walls, and a pair of side flaps extending from the upper edge of the pair of side walls. A structure having an opening on the top surface has been proposed (see Japanese Patent Application Laid-Open No. 2003-170921).

Japanese Unexamined Patent Publication No. 2003-170921

In the above publication, a pulling piece sandwiched between a pair of notches is formed at the tip of the end flap, a pressure piece is formed at the tip of the side flap, and the side flap is folded over the upper side of the end flap. It is described that by pulling up the pulling piece in this state, both ends of the pulling piece ride on the pressure-sensitive piece, and the end flap and the side flap can be connected.

In the box body described in the above publication, three ruled lines are formed on the central portion and the left and right side portions of the pulling piece so that the pulling piece can be easily pulled up. Therefore, in this box body, the end flaps are easily bent by the above ruled lines in the assembled state, and it is difficult to keep the top surface portion of the box body flat.

The present invention has been made in view of such inconvenience, and an object of the present invention is to provide a box sheet in which the top surface of the box can be easily held flat.

The box sheet according to one aspect of the present invention includes a pair of length surface panels and a pair of end surface panels that are alternately connected in the left-right direction, and a pair of lengths extending from the upper edge of the pair of length surface panels. A trapezoidal base that includes a face flap and a pair of end face flaps that extend from the upper edge of the end face panel, and the pair of end face flaps that extend from the upper edge of the end face panel, and this base. The pair of length surface flaps have a substantially rectangular shape, and the tip portions on both sides in the width direction of the tip edge are provided on the outer tip portions in the width direction of the convex portion. It has a pair of lockable notches, and is assembled in a square tube shape so that the pair of length surface panels and the pair of end surface panels face each other, and the pair of length surface flaps are formed. The upper part is bent inside the pair of length surface panels, and the pair of end surface flaps are folded above the pair of length surface flaps and the convex portion is locked to the notch. Assembled into a box with openings.

According to the box sheet according to one aspect of the present invention, it is easy to hold the top surface portion of the box body flat.

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 schematic plan view showing a connecting portion between the long surface flap and the end surface flap of the box body of FIG.

[Explanation of Embodiment 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 pair of length surface panels and a pair of end surface panels that are alternately connected in the left-right direction, and a pair of lengths extending from the upper edge of the pair of length surface panels. A trapezoidal base that includes a face flap and a pair of end face flaps that extend from the upper edge of the end face panel, and the pair of end face flaps that extend from the upper edge of the end face panel, and this base. The pair of length surface flaps have a substantially rectangular shape, and the tip portions on both sides in the width direction of the tip edge are provided on the outer tip portions in the width direction of the convex portion. It has a pair of lockable notches, and is assembled in a square tube shape so that the pair of length surface panels and the pair of end surface panels face each other, and the pair of length surface flaps are formed. The upper part is bent inside the pair of length surface panels, and the pair of end surface flaps are folded above the pair of length surface flaps and the convex portion is locked to the notch. Assembled into a box with openings.

The box sheet is assembled in a square tubular shape so that the pair of length surface panels and the pair of end surface panels face each other, and the pair of length surface flaps have the length of the pair. A box body having an upper opening by being folded inside the face panel and the pair of end face flaps being folded above the pair of length face flaps and the convex portion being locked to the notch. Assembled in. The box sheet has the pair of length surface flaps and the pair of length surface flaps by locking the tip portion of the convex portion provided on the pair of end surface flaps on the outer side in the width direction to the notch provided on the pair of length surface flaps. Since the pair of end face flaps can be connected, it is not necessary to pull the convex portion upward when connecting the pair of length face flaps and the pair of end face flaps. Therefore, in the box sheet, the pair of length surface flaps and the pair of end surface flaps can be easily connected without providing a ruled line for bending on the pair of end surface flaps. Therefore, the box sheet can suppress the bending of the pair of end face flaps in the assembled state and keep the top surface portion of the box body flat.

It is preferable that the convex portion has a substantially rectangular shape in which the corner portions on both sides on the tip side are chamfered. As described above, since the convex portion has a substantially rectangular shape in which the corner portions on both sides on the tip side are chamfered, the convex portion can be more easily locked to the notch.

It has an easy-to-fold line extending from the bottom of the notch to the base end edge of the length surface flap in which the notch is formed, and the easy-to-fold line extends from the bottom of the notch to the length surface flap. It is preferable that the length surface flap is inclined inward in the width direction toward the proximal edge of the surface. As described above, it has an easy-to-bend line extending from the bottom of the notch to the base end edge of the length surface flap in which the notch is formed, and the easy-to-bend line extends from the bottom of the notch to the above-mentioned. The pair of length surface flaps when the convex portion is locked to the notch by inclining inward in the width direction of the length surface flap toward the base end edge of the length surface flap. However, the above-mentioned easy-to-bend line makes it easy to bend. As a result, while keeping the pair of end face flaps horizontal, it becomes easy for the outer portion of the pair of length face flaps in the width direction from the easily bendable line to slip under the pair of end face flaps. As a result, the top surface portion of the box body can be more easily and surely held flat.

It is preferable that the easily bendable line is a lead ruled line in which a plurality of cutting lines and a plurality of ruled lines pressing the inner surface of the sheet are alternately arranged. As described above, the easy-to-bend line is a lead ruled line in which a plurality of cutting lines and a plurality of ruled lines pressing the inner surface of the sheet are alternately arranged, so that the pair of length surface flaps can be easily bent. It can be easily and surely bent with a wire.

The notch is connected to a first straight line portion parallel to the extending direction of the length surface flap and an end portion of the first straight line portion, and the length surface is directed toward the tip edge of the length surface flap. It is preferable that the flap has a V shape having a second straight portion extending inward in the width direction of the flap. In this way, the notch is connected to the first straight line portion parallel to the extending direction of the length surface flap and the end portion of the first straight line portion, and is directed toward the tip edge of the length surface flap. The V-shape having the second straight line portion extending inwardly in the width direction of the length surface flap makes it easier to connect the pair of length surface flaps and the pair of end surface flaps. Can be done.

In the present invention, the "left-right direction" means the horizontal direction in the assumed general usage mode of the box body formed by assembling the box sheet. Further, "upper" means an upper part in a assumed general usage mode of a box body formed by assembling a box sheet.

[Details of Embodiment 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 is composed of one sheet. The box sheet 10 has a pair of length surface panels 1 and a pair of end surface panels 2 that are alternately connected in the left-right direction, and a pair of length surface flaps that extend from the upper edge of the pair of length surface panels 1. 3 and a pair of end face flaps 4 extending from the upper edge of the pair of end face panels 2. Further, the box sheet 10 includes a pair of bottom outer flaps (first bottom outer flap 5a and second bottom outer flap 5b) extending from the lower edge of the pair of length surface panels 1 and a pair of end face panels 2. Of the pair of bottom flaps 6 extending from the lower edge and the pair of length surface panels 1, the left side of the length surface panel 1 located on the outside in the left-right direction (left side in the left-right direction in this embodiment) It is provided with a glue allowance 7 extending from the side edge. The pair of end face flaps 4 has a trapezoidal base portion 11 extending from the upper edge of the end face panel 2 and a convex portion 12 protruding from the tip edge of the base portion 11. The pair of length surface flaps 3 have a substantially rectangular shape. The pair of length surface flaps 3 have a pair of notches 13 capable of locking the tip portions on the outer side in the width direction of the convex portion 12 on both sides in the width direction of the tip edge. In addition, "bottom" means the bottom in the assumed general usage mode of the box body formed by assembling the box sheet. Further, 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 box shape, and specifically, it is assembled into the box body 20 of FIGS. 2 and 3. The box sheet 10 is assembled in a square cylinder shape so that the pair of length surface panels 1 and the pair of end surface panels 2 face each other, and the pair of length surface flaps 3 form a pair of length surface panels 1. A pair of end face flaps 4 are folded inward of the pair of length face flaps 3 and the convex portion 12 is locked to the notch 13, so that the box body 20 having an upper opening can be formed. Assembled.

An example of a procedure for assembling the box sheet 10 into the box body 20 will be described. First, the length surface panel 1 located on the outside in the left-right direction (left side in the left-right direction in the present embodiment) is folded over the inner surface of the end surface panel 2 connected to the length surface panel 1, and then outside in the left-right direction (in the present embodiment). The end face panel 2 located on the right side in the left-right direction) is folded over the inner surface of the length surface panel 1 connected to the end face panel 2, and the glue margin 7 is attached to the inner surface of the folded end face panel 2. Subsequently, the pair of length surface panels 1 and the pair of end surface panels 2 connected in an endless manner are expanded into a square cylinder, the pair of bottom inner flaps 6 are bent inward, and the first bottom outer flap 5a and The bottom portion of the box body 20 is formed by engaging the tip portions of the second bottom outer flap 5b with each other. Next, after the pair of length surface flaps 3 are bent substantially vertically inward, the pair of end surface flaps 4 are bent substantially inward and folded on the pair of length surface flaps 3. Subsequently, the convex portion 12 is pushed down to a length so that the tip portions on both sides of the convex portion 12 of the pair of end face flaps 4 in the width direction are locked by the notches 13 provided in the pair of length surface flaps 3. The top surface portion 21 of the box body 20 is formed by slipping under the surface flap 3. As a result, the box body 20 having an upper opening defined by the tip edges of the pair of length surface flaps 3 and the tip edges of the pair of end face flaps 4 is assembled.

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, one side of the double-sided corrugated cardboard sheet Examples thereof include a double-sided corrugated cardboard sheet in which the tops of the 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.

(Length panel)
The pair of length surface panels 1 are formed in a rectangular shape and substantially the same shape. The left-right length of the length surface panel 1 is larger than the left-right length of the end surface panel 2.

The length of the length surface panel 1 in the left-right direction can be appropriately set based on the size of the articles to be housed in the box body 20, but can be, for example, 30 cm or more and 80 cm or less. The length of the length surface panel 1 in the vertical direction can be appropriately set based on the size 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.

(End face panel)
The pair of end face panels 2 are formed in a rectangular shape and substantially the same shape. The length of the end face panel 2 in the left-right direction can be appropriately set based on the size of the articles to be stored in the box body 20, but can be, for example, 10 cm or more and 50 cm or less. The vertical length of the end surface panel 2 can be the same as the vertical length of the length surface panel 1.

As the lower limit of the ratio of the left-right length of the end face panel 2 to the left-right length of the length surface panel 1, 0.3 is preferable, and 0.4 is more preferable. On the other hand, as the upper limit of the above ratio, 0.6 is preferable, and 0.5 is more preferable. The box sheet 10 has a pair of lengths in a state of being assembled into the box body 20 so that the ratio of the left-right length of the end face panel 2 to the left-right length of the length surface panel 1 is within the above range. It is easy to keep the surface flap 3 and the pair of end surface flaps 4 horizontal. If the above ratio is less than the above lower limit, the flexibility of the end face flap 4 becomes insufficient, and it may be difficult to pass the tip portion of the convex portion 12 in the width direction through the notch 13. On the contrary, when the above ratio exceeds the above upper limit, the flexibility of the length surface flap 3 becomes insufficient, and it may be difficult to pass the tip portion of the convex portion 12 in the width direction through the notch 13. ..

The end face panel 2 is formed with a folding piece 2a defined by a slit and an easy-to-fold line. The folding piece 2a is configured so that a handle hole can be formed in the box body 20 by folding inward in a state of being assembled in the box body 20.

(Length flap)
The pair of length surface flaps 3 are formed to have substantially the same shape. The length surface flap 3 has a base end edge 3a connected to the upper edge of the length surface panel 1 and a tip edge 3b parallel to the base end edge 3a. The left-right length of the length surface flap 3 is substantially equal to the left-right length of the length surface panel 1. The length of the length surface flap 3 in the extending direction is smaller than 1/2 of the length of the end surface panel 2 in the left-right direction. The ratio of the length in the extending direction of the length surface flap 3 to the length in the left-right direction of the end surface panel 2 can be, for example, 0.2 or more and 0.4 or less.

As described above, the length surface flap 3 has a pair of notches 13 on both sides of the tip edge 3b in the width direction. The notch 13 is V-shaped. The notch 13 is connected to a first straight line portion 13a parallel to the extending direction of the length surface flap 3 and an end portion of the first straight line portion 13a (the end portion of the length surface flap 3 on the base end edge 3a side). It has a second straight portion 13b that is inclined inward in the width direction of the length surface flap 3 toward the tip edge 3b side of the length surface flap 3. In the box sheet 10, the notch 13 has the first straight line portion 13a and the second straight line portion 13b, so that the pair of length surface flaps 3 and the pair of end surface flaps 4 can be more easily connected. .. More specifically, by pushing down the convex portion 12 in a state where the end surface flap 4 is folded over the pair of length surface flaps 3, the tip portions on both sides of the convex portion 12 in the width direction can easily pass through the notch 13. Become.

The lower limit of the inclination angle α of the second straight line portion 13b with respect to the tip edge 3b of the length surface flap 3 is preferably 30 °, more preferably 40 °. On the other hand, the upper limit of the inclination angle α is preferably 60 °, more preferably 50 °. If the inclination angle α does not reach the lower limit, the notch 13 (more specifically, the edge of the notch 13) may not sufficiently lock the tip portions on both sides of the convex portion 12 in the width direction. On the contrary, when the inclination angle α exceeds the upper limit, the convex portion 12 and the edge of the notch 13 interfere with each other, so that the tip portions on both sides of the convex portion 12 in the width direction are placed under the pair of length surface flaps 3. It may be difficult to slip into the side.

The length surface flap 3 has a pair of easily bendable lines 14 extending from the bottom of the notch 13 to the proximal edge 3a. The easy-to-bend line 14 is straight. The easy-to-bend line 14 is inclined inward in the width direction of the length surface flap 3 from the bottom of the notch 13 toward the base end edge 3a. In the box sheet 10, the length surface flaps 3 have a pair of easy-to-bend lines 14, so that when the convex portion 12 is locked to the notch 13, the length surface flaps 3 have a pair of easy-to-bend lines 14. Makes it easier to bend. As a result, the box sheet 10 utilizes the bending of the pair of easy-to-bend lines 14 to cut out the tip portions on both sides in the width direction of the convex portion 12 and passes through the pair of length surface flaps 3 to the lower side. Can be easily sneaked into. Further, according to this configuration, the box sheet 10 is in a state where the outer portion in the width direction of the pair of length surface flaps 3 is recessed under the pair of end surface flaps 4. It becomes easy to keep the pair of end face flaps 4 horizontal. As a result, the top surface portion 21 of the box body 20 can be more easily and surely held flat.

The lower limit of the inclination angle β of the easily bendable line 14 with respect to the base end edge 3a of the length surface flap 3 is preferably 30 °, more preferably 45 °. On the other hand, the upper limit of the inclination angle β is preferably 60 °, more preferably 55 °. When the inclination angle β is out of the above range, the function of sneaking the tip portions on both sides of the convex portion 12 in the width direction under the pair of length surface flaps 3 and the function of keeping the pair of end surface flaps 4 horizontal are provided. It may be difficult to fully demonstrate.

The easy-to-bend line 14 is preferably a lead ruled line in which a plurality of cutting lines and a plurality of ruled lines pressing the inner surface of the sheet are alternately arranged. Since the easy-to-bend line 14 is a lead ruled line, the pair of length surface flaps 3 can be easily and surely bent by the easy-to-bend line 14.

It is preferable that the base end edge 3a of the length surface flap 3 is formed with a slit portion 15 extending inward in the width direction with the intersection with the easily bendable line 14 as the outer end portion. Since the slit portion 15 is formed on the proximal end edge 3a in this way, the slit portion 15 can absorb the lift of the length surface flap 3 on the proximal end side due to the convex portion 12. It is easy to keep the length surface flap 3 flat as a whole. The length of the slit portion 15 can be, for example, 5 cm or more and 15 cm or less.

(End face flap)
The pair of end face flaps 4 are formed to have substantially the same shape. The left-right length of the base end edge of the end face flap 4 is substantially equal to the left-right length of the end face panel 2. The extension direction length of the end surface flap 4 can be the same as the extension direction length of the length surface flap 3.

As described above, the end face flap 4 has a trapezoidal base portion 11 and a convex portion 12 projecting from the tip edge of the base portion 11. It is preferable that the end face flap 4 is not formed with an easily bendable line. Further, it is preferable that no slit is formed inside the end face flap 4.

The length L1 in the extending direction of the base portion 11 is substantially equal to the distance D1 between the side edge of the length surface flap 3 and the first straight line portion 13a. The length L2 in the extending direction of the convex portion 12 can be set to be equal to or greater than the distance D2 of the notch 13 at the tip edge 3b of the length surface flap 3. The upper limit of the difference between the length L2 in the extending direction of the convex portion 12 and the distance D2 of the notch 13 at the tip edge 3b of the length surface flap 3 is preferably 2 cm, more preferably 1 cm.

As shown in FIG. 3, in a state where the convex portion 12 is assembled in the box body 20, the tip portion on the outer side in the width direction is locked by the notch 13. The convex portion 12 has a substantially rectangular shape. It is preferable that the corners on both sides of the convex portion 12 are chamfered. According to this configuration, the convex portion 12 can be easily locked by the notch 13.

As shown in FIG. 3, the lower limit of the angle γ formed by the second straight line portion 13b of the notch 13 and the side edge of the convex portion 12 is preferably 30 °, more preferably 40 °. On the other hand, as the upper limit of the angle γ formed, 60 ° is preferable, and 50 ° is more preferable. If the angle γ formed is not less than the lower limit, the convex portion 12 may easily come out of the notch 13. On the contrary, when the angle γ formed exceeds the upper limit, the convex portion 12 may be difficult to engage with the notch 13, and the smoothness of the length surface flap 3 is likely to be impaired at the portion overlapping the convex portion 12. There is a risk.

It is preferable that a pair of straight portions 11a parallel to the proximal edge of the end face flap 4 are formed on both outer sides of the proximal edge of the convex portion 12. According to this configuration, by engaging the pair of straight portions 11a with the bottom portion of the notch 13, it is easy to stably maintain the locked state of the convex portions 12.

(1st bottom outer flap and 2nd bottom outer flap)
The first bottom outer flap 5a extends from the lower edge of the length surface panel 1 arranged on the outer side in the left-right direction. The first bottom outer flap 5a has a substantially rectangular shape. A recess 16a is formed at the tip edge of the first bottom outer flap 5a. The second bottom outer flap 5b has a substantially rectangular main body 17a extending from the lower edge of the length surface panel 1 arranged on the central side in the left-right direction, and a projecting piece 17b extending from the tip edge of the main body 17a. ..

From the base end side to the tip side on both sides in the width direction of the first bottom outer flap 5a and the second bottom outer flap 5b (more specifically, the main body 17a of the first bottom outer flap 5a and the second bottom outer flap 5b). Easy-to-bend lines 16c and 17c extending inwardly in the width direction are formed. The easily bendable lines 16c and 17c are linear.

The procedure for engaging the first outer bottom flap 5a and the second outer bottom flap 5b will be described. In engaging the first bottom outer flap 5a and the second bottom outer flap 5b, first, the first bottom outer flap 5a is bent substantially vertically inward, and then the second bottom outer flap 5b is bent into the first bottom outer flap 5b. Fold it on the outer surface side of 5a. Then, the second bottom outer flap 5b is pushed in while being pressed against the outer surface of the first bottom outer flap 5a. At this time, the pair of easy-to-bend lines 16c provided on the first outer flap 5a and the pair of easy-to-bend lines 17c provided on the second outer flap 5b are appropriately bent to facilitate the second outer flap 5b. Can be pushed into. After pushing the tip edge of the projecting piece 17b of the second bottom outer flap 5b until it passes through the recess 16a of the first bottom outer flap 5a, the pushing of the second bottom outer flap 5b is released. As a result, the reaction force of the sheet material pushes back the first bottom outer flap 5a and the second bottom outer flap 5b, and in this process, the projecting piece 17b enters the inside of the recess 16a. As a result, the first outer flap 5a and the second outer flap 5b are engaged with each other.

(Flap in the bottom)
The pair of bottom flaps 6 are formed to have substantially the same shape. The bottom flap 6 has a substantially rectangular shape. The pair of inner bottom flaps 6 are arranged inside the first outer bottom flap 5a and the second outer bottom flap 5b in a state of being assembled in the box body 20.

<Advantage>
The box sheet 10 has a pair of length surface flaps 3 having a pair of lengths in a state where the pair of length surface panels 1 and the pair of end surface panels 2 are assembled in a square tubular shape so as to face each other. A box having an upper opening by being folded inside the surface panel 1 and having a pair of end surface flaps 4 folded above a pair of length surface flaps 3 and a convex portion 12 locked in a notch 13. Assembled into body 20. The box sheet 10 has a pair of length surfaces by engaging the tip portions of the convex portions 12 provided on the pair of end surface flaps 4 on the outer side in the width direction with the notches 13 provided on the pair of length surface flaps 3. Since the flap 3 and the pair of end face flaps 4 can be connected, it is not necessary to pull up the convex portion 12 when connecting the pair of length surface flaps 3 and the pair of end face flaps 4. Therefore, in the box sheet 10, the pair of length surface flaps 3 and the pair of end surface flaps 4 can be easily connected without providing a ruled line for bending on the pair of end surface flaps 4. Therefore, the box sheet 10 can suppress the bending of the pair of end face flaps 4 in the assembled state and hold the top surface portion 21 of the box body 20 flat.

[Other Embodiments]
The above embodiment does not limit the configuration of the present invention. Therefore, in the above embodiment, the components of each part of the above embodiment can be omitted, replaced or added based on the description of the present specification and the common general technical knowledge, and all of them are construed to belong to the scope of the present invention. Should be.

The specific shape of the convex portion is not limited to the shape described in the above embodiment. For example, the convex portion may not have chamfered corners on both sides on the tip side.

The length surface flap does not necessarily have to have an easy-to-bend line extending from the bottom of the notch to the base end edge of the length surface flap. Further, even when the length surface flap has the foldable line, the foldable line may be, for example, a ruled line formed by pressing one side of the sheet.

The specific shape of the notch is not limited to the shape described in the above embodiment. For example, the notch may be U-shaped with a pair of opposing side edges, or may have a shape in which part or all of the side edges are curved.

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 upper opening and a flat top surface portion.

1 Length surface panel 2 End surface panel 2a Folded piece 3 Length surface flap 3a Base end edge 3b Tip edge 4 End surface flap 5a 1st bottom outer flap 5b 2nd bottom outer flap 6 Bottom inner flap 7 Glue allowance 10 Box sheet 11 Base 11a Straight part 12 Convex part 13 Notch 13a First straight part 13b Second straight part 14 Easy to bend line 15 Slit part 16a Recessed part 16c, 17c Easy to bend line 17a Main body 17b Projection piece 20 Box body 21 Top surface part α Inclination angle of the second straight part with respect to the tip edge of the flap β Inclination angle of the easy-to-bend line with respect to the base end edge of the length surface flap Extension direction length L2 Extension direction length of the convex portion D1 Distance between the side edge of the length surface flap and the first straight line portion D2 Distance of the notch at the tip edge of the length surface flap

Claims (5)

A pair of length surface panels and a pair of end surface panels that are alternately connected in the left-right direction,
A pair of length surface flaps extending from the upper edge of the pair of length surface panels and
It is provided with a pair of end face flaps extending from the upper edge of the pair of end face panels.
The pair of end face flaps have a trapezoidal base extending from the upper edge of the end face panel and a convex portion protruding from the tip edge of the base.
The pair of length surface flaps are substantially rectangular and have a pair of notches on both sides in the width direction of the tip edge that can lock the tip portion on the outer side in the width direction of the convex portion.
The pair of length surface panels and the pair of end surface panels are assembled into a square cylinder so as to face each other.
The pair of length surface flaps are bent inside the pair of length surface panels, and the pair of end surface flaps are folded above the pair of length surface flaps so that the convex portion is formed into the notch. A box sheet that can be assembled into a box with an upper opening by being locked. The box sheet according to claim 1, wherein the convex portion has a substantially rectangular shape with chamfered corners on both sides on the tip side. It has an easy-to-bend line extending from the bottom of the notch to the base edge of the length surface flap in which the notch is formed.
The box according to claim 1 or 2, wherein the easily bendable line is inclined inward in the width direction of the length surface flap from the bottom of the notch toward the base end edge of the length surface flap. Sheet for. The box sheet according to claim 3, wherein the easily bendable line is a lead ruled line in which a plurality of cutting lines and a plurality of ruled lines pressing the inner surface of the sheet are alternately arranged. The notch is connected to a first straight line portion parallel to the extending direction of the length surface flap and an end portion of the first straight line portion, and the length surface is directed toward the tip edge of the length surface flap. The box sheet according to any one of claims 1 to 4, which is V-shaped and has a second straight portion extending inwardly in the width direction of the flap.

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