JP2024008115A - Box body and blank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a box body which can maintain a standing state of side walls and can be easily assembled, and to provide a blank.

SOLUTION: A box body includes: a bottom wall; a pair of first side walls raised on both ends in a first direction of the bottom wall; first flaps continued to an upper end of each of the pair of first side walls; a pair of second side walls raised on both ends in a second direction orthogonal to the first direction of the bottom wall; second flaps continued to an upper end of each of the pair of second side walls; and first extension parts continued to both ends in the first direction of each of the second flaps. The first flap includes a connection part connected to the first extension part, and at least at one first flap out of the first flaps, at least one first ruled line for partitioning the connection part is arranged. The first ruled line extends being inclined with respect to a first boundary line from one end of the first boundary line between the first side wall and at least one first flap.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2024,JPO&INPIT

Description

This case concerns boxes and blanks.

For example, in a rectangular parallelepiped box, flaps are provided at both ends of a pair of opposing side walls among the four side walls standing upright against a rectangular bottom wall, and the flaps are attached to another pair of side walls. The state in which the side walls are erected (the state in which the side walls are erected) is often maintained. However, especially when the height of the side wall is low, the joint area between the flap and the side wall becomes small, so the joint strength is not sufficient, and the standing state of the side wall may not be maintained.

Therefore, various structures have been proposed for maintaining the upright state of side walls in packaging boxes with low height side walls (for example, Patent Document 1).

Japanese Patent Application Publication No. 2004-323065

In addition to maintaining the upright side walls of the box, it is desired that the box be easy to assemble (can be assembled efficiently).

An object of the present invention is to provide a box and a blank whose side walls can be maintained in an upright state and which are easy to assemble.

According to the first aspect of the disclosure, the box includes a bottom wall, a pair of first side walls erected at both ends of the bottom wall in a first direction, and a box connected to an upper end of each of the pair of first side walls. a pair of second side walls erected at both ends of the bottom wall in a second direction perpendicular to the first direction; and a pair of second side walls connected to the upper ends of each of the pair of second side walls. a second flap; and a first extending part connected to both ends of each of the second flaps in the first direction, the first flap having a connecting part connected to the first extending part. At least one first ruled line is disposed on at least one of the first flaps, and the first ruled line is arranged between the first side wall and the at least one first flap. The first boundary line extends from one end of the first boundary line between the first flap and the first flap at an angle with respect to the first boundary line.

According to the second aspect of the disclosure, the box includes a bottom wall, a pair of first side walls erected at both ends of the bottom wall in the first direction, and a pair of first side walls connected to the upper ends of each of the pair of first side walls. a pair of second side walls erected at both ends of the bottom wall in a second direction orthogonal to the first direction; a second flap; and an extension part connected to both ends of the second flap in the first direction, the first flap has a connection part connected to the extension part, and the first flap has a connection part connected to the extension part; At least one ruled line is disposed on at least one of the first flaps, and the ruled line defines one end of the boundary between the first side wall and the first flap. It extends obliquely from the boundary line to the boundary line.

According to the third aspect of the disclosure, the blank includes a bottom portion, a pair of first side portions connected to both ends of the bottom portion in the first direction via a first folding line, and a first side portion of the pair of side portions. A first flap is connected to an end in the first direction of each side surface portion, and a first flap is connected to both ends of the bottom portion in a second direction perpendicular to the first direction via a second folding line. a pair of second side surfaces, a second flap connected to an end in the second direction of each of the pair of second side surfaces, and a third fold at both ends of each of the second flaps in the first direction; a first extending portion connected to each other via a curved line, and the pair of first side portions and the pair of second side portions are connected along the first folding line and the second folding line. When the first extension part is bent to stand upright with respect to the bottom part and the first extension part is bent inward along the third folding line, the first extension part overlaps the first flap, and the first extension part overlaps the first flap. A ruled line extending from one end of the boundary line between the first side surface portion and the at least one first flap at an angle with respect to the boundary line is disposed on at least one first flap of the flaps. There is.

It is possible to provide a box and a blank whose side walls can be maintained in an upright state and which are easy to assemble.

FIG. 1(A) is a perspective view of a box according to one embodiment, and FIG. 1(B) is a diagram showing the structure of a corrugated cardboard sheet. FIG. 2 is a plan view showing a box blank according to one embodiment. FIG. 3(A) is a top view of the box, and FIG. 3(B) is a top view of another example of the box. FIG. 4(A) is a perspective view showing the box with the first and second flaps closed, and FIG. 4(B) shows the state shown in FIG. 1(A) and the state shown in FIG. 4(A). FIG. 3 is a perspective view showing the box in a state between the two states. 5(A) and 5(B) are views of the portion surrounded by the dotted line in FIG. 4(B) from the inside and outside of the box, respectively. FIG. 6 is a perspective view of a box according to a comparative example. FIG. 7 is a perspective view showing another example of the box according to the embodiment. FIG. 8 is a plan view of a blank according to modification example 1. FIG. 9 is a plan view of a blank according to modification example 2. FIG. 10 is a perspective view of a box according to modification 2.

Hereinafter, the box 1 according to one embodiment will be described in detail based on FIGS. 1(A) to 5(B).

FIG. 1(A) is a perspective view showing a box 1 according to an embodiment, and FIG. 1(B) is a diagram showing the structure of a corrugated cardboard sheet. Moreover, FIG. 2 is a plan view showing the blank 1A of the box body 1. Note that FIG. 1(A) shows the box 1 in a state where the blank 1A is assembled.

1A and 2, the length direction of the box 1 is defined as the X direction (first direction), and the width direction is defined as the Y direction (second direction). Moreover, in FIG. 1(A), the height direction of the box 1 is defined as the Z direction. In the following description, "inside" refers to the space inside the box 1 (the space surrounded by the bottom wall 10, the first side wall 11, and the second side wall 13, or the space surrounded by the bottom wall 10, the first side wall 11, , the space surrounded by the second side wall 13, the first flap 12, and the second flap 14), or the side approaching the center of the space within the box body 1. Moreover, "outside" means the outside in the space within the box 1 or the side farther away from the center of the space within the box 1.

The box 1 is formed by assembling blanks 1A shown in FIG. The blank 1A is formed, for example, by punching out a single corrugated sheet with a cutting die or the like. For example, as shown in FIG. 1(B), the corrugated board sheet has a structure in which a front liner 9B and a back liner 9C are bonded to a wavy core 9A. Note that FIG. 2 shows the front liner 9B side (outer surface of the box 1).

In this specification, as shown in FIG. 1(B), the direction of the wave streaks on the core 9A of the corrugated cardboard sheet is referred to as the "paper width direction," and the direction perpendicular to the paper width direction (the direction across the waves) is referred to as the "flow direction." direction. In FIGS. 1A and 2, the "paper width direction" is parallel to the X direction, and the "flow direction" is parallel to the Y direction. Note that the material of the blank 1A is not limited to a corrugated cardboard sheet. The material of the blank 1A can be selected from various paper materials such as corrugated cardboard and paperboard, and any paper quality may be used. The blank 1A may be made of various paper materials coated with various coatings, or may be made of resin other than paper. The thickness of the blank 1A is, for example, about 0.35 to 7.0 mm (preferably 0.35 to 3.0 mm). When the thickness of the blank 1A is set relatively thin, approximately 0.35 to 3.0 mm, the blank becomes easy to bend. Thereby, assembly efficiency, packaging efficiency, and bendability can be improved.

(blank)
As shown in FIG. 2, the blank 1A includes a bottom portion 10A, a pair of first side portions 11A, a pair of first flaps 12, a pair of second side portions 13A, and a pair of second flaps 14. Equipped with.

The bottom portion 10A has a substantially rectangular shape that is long in the X direction (paper width direction). The substantially rectangular shape means a rectangular shape within the range of manufacturing error. The pair of first side portions 11A are connected to both ends of the bottom portion 10A in the X direction (first direction) via the first folding line L1. The first flap 12 is connected to each of the X-direction ends 111A of the pair of first side surfaces 11A via the second folding line L2. More specifically, the first flap 12 is connected to an end 112A on the bottom surface portion 10A side and an end 111A on the opposite side among the end portions 111A and 112A of the first side surface portion 11A facing each other in the X direction. There is.

The first flap 12 has a first connecting portion 12a that is connected (joined) to a first extending portion 15 (more specifically, a second connecting portion 15a), which will be described later. The first connecting portion 12a is divided by first ruled lines L11, and the first ruled lines L11 extend from each end of the boundary line (second folding line L2) between the first flap 12 and the first side surface portion 11A. , and extends at an angle with respect to the boundary line (second folding line L2). More specifically, the first ruled lines L11 approach each other from both ends of the boundary line (second folding line L2) between the first flap 12 and the first side surface portion 11A toward the tip 121 of the first flap 12. It's slanted like that. The first ruled line L11 may be a general-purpose ruled line, a lead ruled line, or a perforation.

The first flap 12 has V-shaped notches (recesses) 20a and 20b on its outer edge. The cutouts 20a and 20b are located on the first ruled line L11. More specifically, the notch 20a is provided at the tip 121 of the first flap 12 and is located on the first ruled line L11. Moreover, the notch 20b is provided at the side end of the first flap 12 and is located on the first ruled line L11. The cutouts 20a and 20b are provided to concentrate stress acting on the first flap 12 or the second flap 14 on the first ruled line L11.

The pair of second side portions 13A are connected to both ends of the bottom portion 10A in the Y direction (second direction) via the third folding line L3. The second flap 14 is connected to each of the Y-direction ends 131A of the pair of second side surfaces 13A via a fourth folding line L4. More specifically, the second flap 14 is connected to an end 131A opposite to the end 132A on the bottom face 10A side, of the ends 131A, 132A of the second side face 13A facing each other in the Y direction. .

A first extending portion 15 is connected to both ends of the second flap 14 in the X direction via a fifth folding line L5. In this embodiment, the length of the first extending portion 15 in the Y direction is approximately the same as the length of the first flap 12 in the X direction, but is not particularly limited. The length of the first extending portion 15 in the Y direction may be shorter or longer than the length of the first flap 12 in the X direction.

The first extending portion 15 has a second connecting portion 15a that connects to the first connecting portion 12a of the first flap 12 described above. The second connecting portion 15a is defined by a second ruled line L12. The second ruled line L12 extends from one end on the second side surface portion 13A side of both ends of the boundary line (fifth folding line L5) between the first extending portion 15 and the second flap 14. It extends at an angle so as to form an obtuse angle with respect to the folding line L5). In other words, the second ruled line L12 extends so that the farther it is from the second flap 14 in the X direction, the closer it gets to the side of the first extension part 15 that is farther from the bottom part 10A among the opposing sides in the Y direction. There is.

In this embodiment, the second ruled line L12 is arranged so as to substantially match the first ruled line L11 when the box body 1 is assembled. Thereby, when either the first flap 12 or the second flap 14 is pressed and folded along the second folding line L2 or the fourth folding line L4, the other flap can also be folded in conjunction with the folding line L2 or the fourth folding line L4. Furthermore, when the first flap 12 and the second flap 14 are completely folded down (the state shown in FIG. 4A), the second folding line L2 and the fifth folding line L5 are substantially on the same plane. Therefore, it is possible to prevent the box 1 from bulging in the height direction (Z direction) (increasing the height of the box 1). That is, in the state where the first flap 12 and the second flap 14 are completely folded down (the state shown in FIG. 4(A)), the box 1 can be made flatter.

Further, the first ruled line L11 and the second ruled line L12 are arranged on the left and right (on both sides), respectively, with respect to each corner of the bottom portion 10A (the part where the first folding line L1 and the third folding line L3 intersect). ing. More specifically, the first ruled line starts from one point on the side extending outward from the corner of the bottom surface portion 10A in the X direction (the side facing the first side surface portion 11A and the first flap 12 in the Y direction). L11 extends, and the second The ruled line L12 is extended. As a result, when the first connecting portion 12a and the first extending portion 15 are brought together from the left and right (both sides) and joined, the starting point of the first ruled line L11 and the starting point of the second ruled line L12 can be visually checked. This makes it possible to prevent the joining position from shifting and to improve assembly efficiency. At this time, when the first ruled line L11 and the second ruled line L12 substantially match, it is possible to further suppress the displacement of the joining position, and it is possible to further improve the assembly efficiency.

The second extending portion 16 is connected to both ends of the second side surface portion 13A in the X direction via a sixth folding line L6. Further, the second extending portion 16 is connected to the end of the first extending portion 15 in the Y direction via the seventh folding line L7.

Note that each of the first to seventh folding lines L1 to L7 may be a general-purpose ruled line, a lead ruled line, or a perforation.

A hole 17 that is long in the X direction is formed at the boundary between the first extending part 15 and the second extending part 16. The hole 17 is provided on the boundary line (seventh folding line L7) between the first extending portion 15 and the second extending portion 16. The hole 17 is provided to allow the thickness of the corrugated cardboard sheet to escape when the first extension part 15 and the second extension part 16 are bent along the seventh folding line L7 when the box body 1 is assembled. ing.

The direction in which the holes 17 extend is preferably parallel to the paper width direction of the corrugated cardboard sheet. Thereby, when the box body 1 is assembled, the first extension portion 15 can be moved more smoothly. Furthermore, by making the direction in which the holes 17 extend parallel to the paper width direction of the corrugated cardboard sheet, the holes 17 can be easily punched out during the production of the blank 1A, thereby improving the production efficiency of the blank 1A.

(box body)
The box 1 shown in FIG. 1(A) is obtained by assembling blanks 1A having the above configuration. In the box 1 shown in FIG. 1(A), a bottom surface portion 10A of the blank 1A forms a bottom wall 10, a pair of first side surface portions 11A form a pair of first side walls 11, and a pair of second side surface portions form a pair of first side walls 11. 13A forms a pair of second side walls 13. Furthermore, the end 111A of the first side wall 11A of the blank 1A forms the upper end 111 of the first side wall 11, and the end 131A of the second side wall 13A forms the upper end 131 of the second side wall 13. Further, the fifth folding line L5 forms a boundary line 141 between the second flap 14 and the first extending portion 15. Note that since the upper end 111 of the first side wall 11 is also the boundary between the first flap 12 and the first side wall 11, the upper end 111 of the first side wall 11 may be referred to as a boundary line 111 in the following description. .

To assemble the box body 1 from the blank 1A, the first side surface portion 11A and the second side surface portion 13A are bent along the first folding line L1 and the third folding line L3 so as to stand up against the bottom surface portion 10A, respectively. , the first extending portion 15 and the second extending portion 16 are bent inward along the fifth folding line L5 and the sixth folding line L6. The first side surface portion 11A, the second side surface portion 13A, the first extension portion 15, and the second extension portion 16 may be bent in any order. In this way, as shown in FIG. 1(A), the first side surface portion 11A (first side wall 11) and the second extension portion 16 overlap, and the first flap 12 and the first extension portion 15 overlap. Overlap.

As shown in FIG. 2, adhesive G is applied to a part of the second connecting part 15a of the first extending part 15 (the part facing the first flap 12), and the first flap 12 is attached to the first extending part 15. When pressed against the surface of the portion 15 coated with the adhesive G, the first extension portion 15 and the first flap 12 are joined (fixed). Thereby, the state in which the first side surface portion 11A and the second side surface portion 13A are respectively erected with respect to the bottom surface portion 10A is maintained. That is, the first side wall 11 and the second side wall 13 can be formed to stand up from the bottom wall 10.

Further, in the present embodiment, the first ruled line L11 arranged on the first flap 12 and the second ruled line L12 arranged on the first extension part 15 are arranged so that they substantially match when the box body 1 is assembled. It is located. Therefore, when pressing the first flap 12 against the surface of the first extension part 15 to which the adhesive G is applied, the first ruled line L11 and the second ruled line L12 are visually checked so that they substantially match. By overlapping the first flap 12 and the first extension part 15, it is possible to prevent the joining position of the first flap 12 and the first extension part 15 from shifting, and to improve assembly efficiency. Moreover, since the first flap 12 and the first extension part 15 can be joined while checking the side ends of the first flap 12 and the side ends of the second flap 14, the box body 1 can be set upright. The box 1 can be assembled while checking its accuracy. This also improves assembly efficiency. Note that "approximately matching" means that the first ruled line L11 and the second ruled line L12 may deviate within the range of manufacturing error and assembly error.

As the adhesive, a hot melt adhesive, an aqueous emulsion adhesive, or the like can be used. Further, instead of using adhesive, double-sided tape, a stapler, other connecting tools, or the like may be used to connect the first extending portion 15 and the first flap 12.

FIG. 3(A) is a diagram (top view) of the box 1 shown in FIG. 1(A) viewed from the +Z direction. In this embodiment, in the box 1, the first extension portion 15 is located inside the first flap 12. That is, in FIGS. 1A and 3A, the outer surface 15o of the first extending portion 15 is fixed to the inner surface 12i of the first flap 12. Here, the inner surface 12i is a space surrounded by the bottom wall 10, the first side wall 11, and the second side wall 13 among the two opposing surfaces 12i and 12o of the first flap 12, in which the packaged item is accommodated. It's about something close to you. Further, the outer surface 15o is a surface farthest from the space in which the object to be packaged is accommodated, of the two opposing surfaces 15i and 15o of the first extension portion 15.

In addition, in this embodiment, as shown in FIG. 3(A), the outer surface 15o of the first extension part 15 is fixed to the inner surface 12i of the first flap 12, but as shown in FIG. 3(B), , the first extending portion 15 may be located outside the first flap 12. In this case, the inner surface 15i of the first extending portion 15 may be fixed to the outer surface 12o of the first flap 12.

Although the example in which the adhesive is applied to the second connecting part 15a of the first extending part 15 has been described, if the first extending part 15 and the first flap 12 can be fixed, the adhesive can be applied to the first extending part 15. It may be applied to any of the 15 positions. In addition, in FIG. 2, the adhesive G is applied to the second connecting part 15a of the first extending part 15, but the adhesive G is also applied to parts of the first extending part 15 other than the second connecting part 15a. may be coated. Further, the adhesive may be applied to the first connecting portion 12a of the first flap 12 instead of the second connecting portion 15a. Further, in addition to the second connecting portion 15a or the first connecting portion 12a, an adhesive may be applied to the second extending portion 16 or the first side surface portion 11A.

(First ruled line L11 and second ruled line L12)
In the box 1, the first ruled line L11 is arranged on the first flap 12, and the second ruled line L12 is arranged on the first extension part 15, and the first ruled line L11 and the second ruled line L12 are approximately different from each other. Match. Further, a notch 20a is provided at the outer edge of the first flap 12 and on the first ruled line L11. Here, the effects of the first ruled line L11 and the second ruled line L12 and the effect of the notch 20a will be explained.

When packaging an object using the box 1 shown in FIG. The first flap 12 and the second flap 14 are closed to create the state shown in FIG. 4(A).

Here, the behavior of the box 1 from the state shown in FIG. 1(A) to the state shown in FIG. 4(A) will be described. FIG. 4(B) is a perspective view showing the box 1 in a state between the state shown in FIG. 1(A) and the state shown in FIG. 4(A). Moreover, FIGS. 5(A) and 5(B) are views of the part surrounded by the dotted line in FIG. 4(B) from the inside of the box 1 and the outside of the box 1, respectively. It shows how the existing portion 15 and the second extending portion 16 are folded.

In the packing operation, after placing the item to be packaged inside the box 1 shown in FIG. 1(A), the first flap 12 is pushed inward as shown by the arrow AR1 in FIG. 4(B). (fold inward). Here, since the notch 20a is provided at the outer edge of the first flap 12 and on the first ruled line L11, the stress caused when the first flap 12 is pressed is concentrated on the first ruled line L11, and as a result, The first flap 12 is bent at the first ruled line L11.

As described above, since the first ruled line L11 arranged on the first flap 12 and the second ruled line L12 provided on the first extension part 15 substantially match (the left side diagram of FIG. 5(A) ), when the first flap 12 is folded along the first ruled line L11, the first extending portion 15 is also folded along the second ruled line L12.

Therefore, as shown in FIGS. 5(A) and 5(B), the first flap 12 and the first extending portion 15 are folded along the first ruled line L11 and the second ruled line L12. As a result, as shown by arrow AR2 in FIG. 4(B), the second flap 14 connected to the first extension portion 15 is pulled toward the first flap 12, and the second flap 14 is pulled toward the first flap 12. The opening of the box 1 can be covered.

In this way, the first ruled line L11 and the second ruled line L12 are provided on the first flap 12 and the first extension portion 15, respectively, thereby facilitating the packing operation.

Furthermore, in this embodiment, the first ruled line L11 is arranged to intersect with the paper width direction of the corrugated cardboard sheet (see FIG. 2). This point will be explained in detail.

As shown in FIG. 1(B), the corrugated cardboard sheet has the peaks and valleys of the wavy core 9A bonded to the front liner 9B and the back liner 9C, so that they intersect (perpendicularly) in the paper width direction. When the ruled line L31 is provided, a plurality of peaks of the center core 9A will exist under the location where the ruled line L31 is provided, and the ruled line L31 is supported three-dimensionally. Thereby, when providing ruled lines so as to intersect with the paper width direction, regular ruled lines can be provided to the front liner 9B or the back liner 9C. In addition, deformation of the corrugated cardboard sheet can be suppressed at locations where ruled lines are provided so as to intersect with the paper width direction, and the corrugated cardboard sheet can be folded in a regular shape. In addition, even if ruled lines are provided to cross the width of the paper, the deformation of the cardboard material is suppressed, preventing a decrease in strength, and making it possible to obtain elastic force when the corrugated cardboard sheet is folded along the ruled lines. can.

On the other hand, when providing the ruled line L32 parallel to the paper width direction, it is difficult to provide the regular ruled line L32 because the plurality of peaks of the center core 9A do not have a structure that supports the ruled line L32. For this reason, when providing ruled lines parallel to the paper width direction, it is difficult to fold the corrugated cardboard sheet in a regular shape at the location where the ruled lines are provided. Furthermore, when ruled lines are provided, the strength of the corrugated cardboard material decreases.

In this embodiment, the first ruled line L11 is arranged to intersect with the paper width direction of the corrugated cardboard sheet. Thereby, the corrugated cardboard sheet can be folded into a regular shape, and a decrease in strength as a corrugated cardboard material can be prevented. Further, when the first flap 12 is folded along the first ruled line L11, the first flap 12 (specifically, the first connecting portion 12a) is pushed back in the opposite direction to the folding direction. That is, elastic force can be applied to the first flap 12. As a result, for example, when the box 1 is unpacked (for example, when the packing tape that closed the second flap 14 is removed), the first connecting portion 12a of the first flap 12 tends to open outward. As a result, the second flap 14 is also pushed outward, making unpacking easier.

Further, since a hole 17 is provided at the boundary between the first extending portion 15 and the second extending portion 16, when the first extending portion 15 is bent together with the first flap 12, the corrugated cardboard sheet is Thickness can be released. Thereby, the bendability of the first flap 12 can be improved. Moreover, since the hole 17 is located on the seventh folding line L7, the second flap 14 can be easily opened and closed, and the first flap 12 can also be easily opened and closed.

As described above in detail, the box 1 according to the present embodiment includes a bottom wall 10, a pair of first side walls 11 erected at both ends of the bottom wall 10 in the X direction (first direction), A first flap 12 connected to the upper end 111 of each of the pair of first side walls 11, and a pair of second side walls 13 erected at both ends of the bottom wall 10 in the Y direction (second direction) orthogonal to the X direction. , a second flap 14 connected to the upper end 131 of each of the pair of second side walls 13, and a first extending portion 15 connected to both ends of each second flap 14 in the X direction. The first flap 12 has a first connecting portion 12a that connects to the first extending portion 15, and a first ruled line L11 that partitions the first connecting portion 12a is arranged on the first flap 12. The first ruled line L11 extends from each end of the boundary line 111 between the first side wall 11 and the first flap 12 at an angle with respect to the boundary line 111.

In the box 1 according to the embodiment, since the first extension part 15 and the first flap 12 are joined, the joint area is smaller than when the second extension part 16 and the first side surface part 11A are joined. is large and the bonding strength is improved. Thereby, the upright state of the first side wall 11 and the second side wall 13 can be maintained more reliably. Moreover, since it is only necessary to join the first flap 12 and the first extension part 15 which are located further from the bottom wall 10 than the first side wall 11 and the second side wall 13 during assembly, the first flap which is closer to the bottom wall 10 Assembly is easier compared to the case where the side wall 11 and the second extension part 16 are joined. Further, since the first ruled line L11 is arranged on the first flap 12, when the first flap 12 is pushed inward (folded), the first flap 12 is folded along the first ruled line L11, and the first The second flap 14 connected to the first extension part 15 joined to the flap 12 also follows the first flap 12 and falls inward. Thereby, the opening can be easily closed and packaging efficiency can be improved.

The effects of the box 1 according to the present embodiment will be explained in more detail using a box 1000 according to a comparative example. FIG. 6 is a perspective view of a box 1000 according to a comparative example. In FIG. 6, the upper right diagram is an enlarged diagram of the dotted line portion. The box 1000 differs from the box 1 in that the first extending portion 15 is not provided and the first flap 12 is not provided with the first ruled line L11. Since the other configurations are the same as the box 1, detailed description will be omitted.

In the box body 1000, when forming the first side wall 11 and the second side wall 13 that stand up to the bottom wall 10, the second extending portion 16 is connected to the first side wall 11 (in the blank state, the first side wall 11A). (refer to the enlarged image on the upper right). At this time, if the height of the first side wall 11 and the second side wall 13 is low, even if the second extension part 16 is bonded to the first side wall 11, the bonding area is small and the bonding force is small. It is difficult to maintain the upright state of the second side wall 13. That is, since the bonding strength of the members (the second extension portion 16 and the first side surface portion 11A) that are bonded together to maintain the upright state of the first side wall 11 and the second side wall 13 is low, the first side wall 11 and the second side wall 13 are bonded together. It is difficult to maintain the upright state of the second side wall 13.

On the other hand, in this embodiment, since the first extension part 15 and the first flap 12 are joined, the joining area is made larger than when joining the second extension part 16 and the first side surface part 11A. The bonding strength is high. Therefore, the upright state of the first side wall 11 and the second side wall 13 can be maintained more reliably. Moreover, since it is only necessary to join the first flap 12 and the first extension part 15 which are located further from the bottom wall 10 than the first side wall 11 and the second side wall 13 during assembly, the first flap which is closer to the bottom wall 10 Assembly is easier compared to the case where the side wall 11 and the second extension part 16 are joined.

In the present embodiment, the first extending portion 15 is connected from one end of the boundary line 141 between the second flap 14 and the first extending portion 15 on the second side wall 13 side to the boundary line 141 between the second flap 14 and the first extending portion 15. A second ruled line L12 extending at an angle with respect to 141 is arranged. Thereby, the second connecting portion 15a of the first extending portion 15 can be easily folded.

Furthermore, in this embodiment, the first ruled line L11 substantially matches the second ruled line L12. Thereby, the first flap 12 and the first extending portion 15 can be joined while the first ruled line L11 and the second ruled line L12 are substantially aligned, and the ease of assembly can be improved. Moreover, since the first ruled line L11 is arranged on the first flap 12, when the first flap 12 is pushed inward (folded), the first flap 12 is folded inward along the first ruled line L11. Then, since the first ruled line L11 folded inward pushes inward the second ruled line L12 arranged so as to substantially match the first ruled line L11, the second ruled line L12 is bent inward, and the second ruled line L12 is pushed inward. The first extension portion 15 having the first extension portion 15 is pushed inward. As a result, the second flap 14 connected to the first extending portion 15 also falls inward so as to follow the first flap 12. In this way, the second flap 14 follows the first flap 12 and moves easily, so by folding the first flap 12 inward, the opening can be covered by the second flap 14, increasing packing efficiency. can be improved. Furthermore, by folding the first flap 12 and the second flap 14 so that they overlap, the gap between the first flap 12 and the second flap 14 in the Z direction can be minimized, and the box body It is possible to suppress the bulge at the bending point in 1. Thereby, the flatness of the boxes 1 when stacked can be improved.

In the present embodiment, the box body 1 also includes a second extending portion 16 that is continuous to both ends of the pair of second side walls 13 in the X direction and is continuous to the first extending portion 15. A hole 17 is formed at the boundary between the first extending portion 15 and the second extending portion 16 . Thereby, when the first extending portion 15 is bent together with the first flap 12, the thickness of the corrugated cardboard sheet can be released, so that the bendability of the first flap 12 can be improved. In addition, since the second extending portion 16 exists, foreign matter such as dust may enter the inside of the box 1 from outside the box 1, and objects to be packaged may come out from the inside of the box 1 to the outside of the box 1. It is possible to prevent this from happening. Moreover, the strength of the box body 1 can be improved by forming a double wall structure with the first side surface portions 11A at the four corners of the box body 1 due to the second extending portions 16.

Further, in this embodiment, the first flap 12 has a notch (recess) 20a on the outer edge, and the notch 20a is located on the first ruled line L11. Thereby, the stress generated in the first flap 12 can be concentrated on the first ruled line L11, and the first flap 12 can be reliably bent at the first ruled line L11.

Further, according to the present embodiment, the blank 1A includes a bottom surface portion 10A, a pair of first side surface portions 11A that are connected to both ends of the bottom surface portion 10A in the X direction via the first folding line L1, and a pair of A first flap 12 is connected to each end 111A of the first side surface portion 11A in the X direction, and a first flap 12 is connected to each end of the first side surface portion 11A in the Y direction perpendicular to the X direction via a third folding line L3. A pair of second side parts 13A, a second flap 14 connected to each end 131A in the Y direction of the pair of second side parts 13A, and a fifth fold line at both ends of each second flap 14 in the X direction. A first extending portion 15 is provided which is connected to the first extending portion 15 via L5. The pair of first side parts 11A and the pair of second side parts 13A are bent along the first folding line L1 and the third folding line L3 so as to stand up against the bottom part 10A, and the pair of first side parts 11A and the pair of second side parts 13A are bent along the fifth folding line L5. When the first extending portion 15 is bent inward, the first extending portion 15 overlaps the first flap 12. In addition, the first flap 12 has a shape that is inclined from one end of the boundary line (second folding line L2) between the first side surface portion 11A and the first flap 12 to the boundary line (second folding line L2). A first ruled line L11 that extends is arranged. As a result, by joining the first extending portion 15 and the first flap 12 with the pair of first side portions 11A and the pair of second side portions 13A standing upright with respect to the bottom portion 10A, , the first side wall 11 and the second side wall 13 of the box body 1 can be maintained in an upright state. Moreover, since it is only necessary to join the first flap 12 and the first extension part 15 which are located further from the bottom wall 10 than the first side wall 11 and the second side wall 13 during assembly, the first flap which is closer to the bottom wall 10 Assembly is easier compared to the case where the side wall 11 and the second extension part 16 are joined. In addition, since the first ruled line L11 is arranged on the first flap 12, when the first flap 12 of the assembled box 1 is pushed inward (tilted down), the first flap 12 aligns with the first ruled line L11. The second flap 14, which is connected to the first extension part 15 joined to the first flap 12, also follows the first flap 12 and falls inward. Thereby, the opening can be easily closed and packaging efficiency can be improved.

Further, in this embodiment, the thickness of the blank 1A can be set to, for example, about 0.35 to 7.0 mm. When the thickness of the blank 1A is set to be as thin as 0.35 to 3.0 mm, the blank becomes easier to fold, which further improves assembly efficiency, packaging efficiency, and bendability. . Therefore, when the thickness of the blank 1A is set to about 0.35 to 3.0 mm, the effects of ease of assembly and high packaging efficiency achieved by the blank 1A having the above-described configuration are further compounded.

In addition, although in the said embodiment, the 1st ruled line L11 and the 2nd ruled line L12 substantially corresponded in the box 1 (refer FIG. 1), it is not restricted to this. FIG. 7 is a diagram showing another example of the box body 1. In FIG. 7, the upper right figure is an enlarged view of the part surrounded by the dotted line. As shown in FIG. 7, the first ruled line L11 and the second ruled line L12 do not have to match. Even if the first ruled line L11 and the second ruled line L12 do not match, when either the first flap 12 or the second flap 14 is pressed and bent, the other can also be folded in conjunction. . Thereby, packaging efficiency can be improved. However, as explained in the above embodiment, the height of the box 1 is prevented from increasing when the first flap 12 and the second flap 14 are closed (the state shown in FIG. 4(A)). Therefore, it is preferable that the first ruled line L11 and the second ruled line L12 substantially match.

In addition, in the said embodiment, the 1st ruled line L11 was arrange|positioned at the 1st flap 12, and the 2nd ruled line L12 was arrange|positioned at the 1st extension part 15, but it is not restricted to this. For example, the first ruled line L11 may be arranged on the first flap 12, and the second ruled line L12 on the first extending portion 15 may be omitted. On the contrary, the second ruled line L12 may be arranged on the first extending portion 15, and the first ruled line L11 of the first flap 12 may be omitted. Even in this case, when the first flap 12 of the box body 1 is folded inward, the second flap 14 connected to the first extension part 15 joined to the first flap 12 also falls on the first flap 12. Since it can follow and fall inward to cover the opening, packaging efficiency can be improved.

Further, in the above embodiment, two first ruled lines L11 are arranged on each of the first flaps 12, for a total of four first ruled lines L11, but the present invention is not limited to this. At least one first ruled line L11 may be disposed on at least one of the first flaps 12. That is, the total number of first ruled lines L11 may be one. Even if the number of first ruled lines L11 is one, by pushing down the first flap 12 on which the first ruled line L11 is arranged inward, the first flap 12 is folded along the first ruled line L11, and the first flap 12 is folded along the first ruled line L11. Since the second flap 14 covers the opening in conjunction with the flap 12, the packing operation can be made more efficient.

Further, in the embodiment described above, the second ruled line L12 is arranged in each of the first extension parts 15, and a total of four second ruled lines L12 are arranged, but the present invention is not limited to this. The second ruled line L12 may be arranged on at least one of the first extending portions 15. That is, the total number of second ruled lines L12 may be one. Even if the number of second ruled lines L12 is one, by pushing down the first flap 12 inward, the first flap 12 connected to the first extending portion 15 where the second ruled line L12 is arranged can be Since the second flap 14 is folded along the second ruled line L12 and covers the opening in conjunction with the folded first flap 12, the packing operation can be made more efficient.

Further, in the above embodiment, the holes 17 were provided at each boundary between the first extending portion 15 and the second extending portion 16, but the hole 17 is not limited to this. For example, the hole 17 may be provided in at least one of the boundaries between the first extending portion 15 and the second extending portion 16. By providing the holes 17, the thickness at the time of bending can be released, so that the bendability of the first flap 12 can be improved.

Furthermore, in the embodiment described above, the cutouts 20a and 20b may be omitted. Furthermore, the cutouts 20a and 20b may be arranged on at least one of the first ruled lines L11.

Further, in the above embodiment, the lengths of the two second flaps 14 in the Y direction are approximately the same, but the lengths of the two second flaps 14 in the Y direction are not limited to this. You can leave it there.

Further, in the above embodiment, the first extending portion 15 and the second extending portion 16 are connected, but the first extending portion 15 and the second extending portion 16 may be separated. Further, as in Modification 1 below, the second extending portion 16 may be omitted.

(Modification 1)
FIG. 8 is a plan view showing a box blank 1B according to modification 1. In the blank 1B shown in FIG. 8, the second extending portions 16 are not provided at both ends of the second side surface portion 13A in the X direction. In addition, in the first extending portion 15, of the two opposing sides in the Y direction, the side 15c on the second side surface portion 13A side is configured such that the width of the first extending portion 15 in the Y direction becomes narrower toward the tip. It is inclined with respect to the boundary line (fifth folding line L5) between the first extension part 15 and the second flap 14.

Further, in the assembled state of the blank 1B, the side 15c of the first extension portion 15 substantially coincides with the first ruled line L11 arranged on the first flap 12.

Even with such a configuration, the same effects as in the embodiment can be achieved.

In addition, in FIG. 8, each of the four first extending portions 15 has a side 15c that is inclined with respect to the boundary line (fifth folding line L5) between the first extending portion 15 and the second flap 14. However, it is not limited to this. In at least one of the four first extending parts 15, the first extending part 15 and the second flap 14 are arranged such that the width of the first extending part 15 in the Y direction becomes narrower toward the tip of the side 15c. It suffices if it is inclined with respect to the boundary line (fifth folding line L5) between them. A side that is inclined with respect to the boundary line (fifth folding line L5) between the first extending part 15 and the second flap 14 so that the width of the first extending part 15 in the Y direction becomes narrower toward the tip. Even if the number of 15c is one, by pushing down the first flap 12 inward, the first flap 12 connected to the first extension part 15 having the side 15c is folded along the side 15c. Since the second flap 14 covers the opening in conjunction with the folded first flap 12, the packing operation can be made more efficient.

(Modification 2)
FIG. 9 is a plan view showing a box blank 1C according to Modification 2, and FIG. 10 is a perspective view showing a box 1c assembled from the blank 1C.

In the embodiment, the second flaps 14 were connected to the respective ends 131A of the pair of second side surfaces 13A, but in Modification 2, as shown in FIGS. 9 and 10, the second flaps 14 are The second flap 14 is connected only to one end 131A of the flap 13A.

The first ruled line L11 arranged on the first flap 12 extends from one end of the boundary line (second folding line L2) between the first side surface portion 11A and the first flap 12 on the second flap 14 side to the boundary line. (The second folding line L2) is stretched obliquely. Other configurations are similar to those in the embodiment.

In this way, even when the second flap 14 is connected only to one end 131A of the pair of second side surfaces 13A, the same effects as in the embodiment can be obtained.

In the above embodiment and its modified example, the box body in which the first side wall 11 and the second side wall 13 are low in height has been described, but the present invention is not limited to this. The above embodiment and its modified examples are also applicable to a box body in which the first side wall 11 and the second side wall 13 are high in height.

The embodiments described above are examples of preferred implementations of the present invention. However, the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention.

1, 1c Box bodies 1A, 1B, 1C Blank 10 Bottom wall 10A Bottom part 11 First side wall 11A First side part 12 First flap 12a First connection part 12i Inner surface of the first flap 12o Outer surface of the first flap 13 Second Side wall 13A Second side surface portion 14 Second flap 15 First extension portion 15a Second connection portion 15c Side of first extension portion 16 Second extension portion 17 Hole 20a Notch 111 Upper end of first side wall 111A First side surface 131 Upper end of the second side wall 131A End of the second side wall L1 First folding line L2 Second folding line L3 Third folding line L5 Fifth folding line L11 First ruled line L12 Second ruled line

Claims (9)

the bottom wall,
a pair of first side walls erected at both ends of the bottom wall in the first direction;
a first flap connected to the upper end of each of the pair of first side walls;
a pair of second side walls erected at both ends of the bottom wall in a second direction perpendicular to the first direction;
a second flap connected to the upper end of each of the pair of second side walls;
a first extending portion connected to both ends of each of the second flaps in the first direction;
Equipped with
The first flap has a connecting part that connects with the first extending part,
At least one first ruled line is disposed on at least one of the first flaps, and at least one first ruled line is disposed on at least one of the first flaps,
The first ruled line extends from one end of the first boundary line between the first side wall and the at least one first flap at an angle with respect to the first boundary line.
Box body. the first extension portion is fixed to the inner surface of the first flap at the connection portion;
The box according to claim 1. the first extension part is fixed to the outer surface of the first flap at the connection part;
The box according to claim 1. At least one of the first extension parts has a portion on the second side wall side of both ends of the second boundary line between the second flap and the at least one first extension part. a second ruled line extending from one end at an angle with respect to the second boundary line; The side on the second side wall side is inclined with respect to the second boundary line so that the width in the second direction of the at least one first extension portion becomes narrower toward the tip.
The box according to any one of claims 1 to 3. the first ruled line substantially coincides with the second ruled line or the side on the second side wall side;
The box according to claim 4. a second extending portion connected to both ends of each of the pair of second side walls in the first direction and connected to the first extending portion;
A hole is formed in at least one boundary between the first extension part and the second extension part,
The box according to claim 5. the at least one first flap has a recess on an outer edge;
the recess is located on the first ruled line;
The box according to claim 6. the bottom wall,
a pair of first side walls erected at both ends of the bottom wall in the first direction;
a first flap connected to the upper end of each of the pair of first side walls;
a pair of second side walls erected at both ends of the bottom wall in a second direction perpendicular to the first direction;
a second flap connected to an upper end of one of the pair of second side walls;
an extending portion connected to both ends of the second flap in the first direction;
Equipped with
The first flap has a connecting part that connects with the extending part,
At least one ruled line is arranged on at least one of the first flaps to define the connection part,
The ruled line extends from one end of the boundary line between the first side wall and the first flap at an angle with respect to the boundary line.
Box body. The bottom part and
a pair of first side parts connected to both ends of the bottom part in the first direction via a first folding line;
a first flap connected to an end in the first direction of each of the pair of first side parts;
a pair of second side portions connected to each other via a second folding line at both ends of the bottom portion in a second direction perpendicular to the first direction;
a second flap connected to an end in the second direction of each of the pair of second side surfaces;
a first extending portion connected to both ends of each of the second flaps in the first direction via a third folding line;
Equipped with
The pair of first side parts and the pair of second side parts are bent along the first folding line and the second folding line so as to stand up from the bottom part, and the pair of first side parts and the second side part are bent along the third folding line. when the first extending portion is bent inward, the first extending portion overlaps the first flap,
At least one of the first flaps has a ruled line extending from one end of the boundary line between the first side surface portion and the at least one first flap at an angle with respect to the boundary line. is placed,
blank.

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