Box and blank

Abstract

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

Description

Technical Field

[0007] ,

[0001] This invention relates to a box body and a blank.

Background Art

[0002] For example, in a rectangular parallelepiped box body, flaps are provided at both ends of a pair of opposing side walls out of the four side walls erected with respect to the rectangular bottom wall, and the side walls are often maintained in an erected state (the erected state of the side walls) by attaching the flaps to another pair of side walls. However, especially when the height of the side walls is low, the joining area between the flaps and the side walls becomes small, so the joining strength is not sufficient, and there are cases where the erected state of the side walls cannot be maintained.

[0003] Therefore, various structures for maintaining the erected state of the side walls have been proposed in packaging boxes with low side wall (side surface) height (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In a box body, in addition to maintaining the erected state of the side walls, it is desired that assembly is easy (efficient assembly is possible).

[0006] An object of the present invention is to provide a box body and a blank that can maintain the erected state of the side walls and are easy to assemble.

Means for Solving the Problems

[0007] According to the first aspect of the disclosure, the box body comprises a bottom wall, a pair of first side walls erected at both ends of the bottom wall in a 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, and a first extension connected to both ends of each of the second flaps in the first direction, wherein the first flaps have connecting portions that connect to the first extension portions, and at least one of the first flaps has at least one first scribe line that demarcates the connecting portion, and the first scribe line extends inclined with respect to the first boundary line from one end of a first boundary line between the first side wall and the at least one first flap.

[0008] According to a second aspect of the disclosure, the box body comprises a bottom wall, a pair of first side walls erected at both ends of the bottom wall in a 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 one of the pair of second side walls, and an extension connected to both ends of the second flap in the first direction, wherein the first flap has a connecting portion that connects to the extension portion, and at least one of the first flaps has at least one scribe line that demarcates the connecting portion, and the scribe 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.

[0009] According to the third aspect of the disclosure, the blank comprises a bottom surface, a pair of first side surfaces connected to both ends of the bottom surface in a first direction via a first fold line, a first flap connected to the end of each of the pair of first side surfaces in the first direction, a pair of second side surfaces connected to both ends of the bottom surface in a second direction perpendicular to the first direction via a second fold line, a second flap connected to the end of each of the pair of second side surfaces in the second direction, and a third fold line connected to both ends of each of the second flaps in the first direction The device comprises a first extended portion, wherein the pair of first side portions and the pair of second side portions are folded along the first and second fold lines so as to stand upright relative to the bottom portion, and the first extended portion is folded inward along the third fold line, the first extended portion overlaps with the first flap, and at least one of the first flaps has a scribe line that extends inclined toward the boundary line from one end of the boundary line between the first side portion and the at least one first flap. [Effects of the Invention]

[0010] This invention provides a box body and blank that can maintain the upright position of the side walls and are easy to assemble. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1(A) is a perspective view of a box according to one embodiment, and Figure 1(B) is a diagram showing the structure of a corrugated cardboard sheet. [Figure 2] Figure 2 is a plan view showing a blank box body according to one embodiment. [Figure 3] Figure 3(A) is a top view of the box, and Figure 3(B) is a top view showing another example of the box. [Figure 4] Figure 4(A) is a perspective view showing the box with the first and second flaps closed, and Figure 4(B) is a perspective view showing the box in a state between the state shown in Figure 1(A) and the state shown in Figure 4(A). [Figure 5]Figures 5(A) and 5(B) show the area enclosed by the dotted line in Figure 4(B) as viewed from the inside and outside of the box, respectively. [Figure 6] Figure 6 is a perspective view of the box according to the comparative example. [Figure 7] Figure 7 is a perspective view showing another example of the box body according to the embodiment. [Figure 8] Figure 8 is a plan view of the blank according to Modification Example 1. [Figure 9] Figure 9 is a plan view of the blank according to modified example 2. [Figure 10] Figure 10 is a perspective view of the box according to modified example 2. [Modes for carrying out the invention]

[0012] The following describes in detail a box body 1 according to one embodiment, based on Figures 1(A) to 5(B).

[0013] Figure 1(A) is a perspective view showing a box body 1 according to one embodiment, and Figure 1(B) is a diagram showing the structure of a corrugated cardboard sheet. Figure 2 is a plan view showing the blank 1A of the box body 1. Note that Figure 1(A) shows the box body 1 in the assembled state of the blank 1A.

[0014] In Figures 1(A) and 2, the length direction of the box body 1 is defined as the X direction (first direction), and the width direction is defined as the Y direction (second direction). Also, in Figure 1(A), the height direction of the box body 1 is defined as the Z direction. Furthermore, in the following explanation, "inside" means the inside of the space within the box body 1 (the space enclosed by the bottom wall 10, the first side wall 11, and the second side wall 13, or the space enclosed by the bottom wall 10, the first side wall 11, the second side wall 13, the first flap 12, and the second flap 14), or the side closer to the center of the space within the box body 1. Also, "outside" means the outside of the space within the box body 1, or the side further away from the center of the space within the box body 1.

[0015] The box body 1 is formed by assembling the blank 1A shown in FIG. 2. The blank 1A is formed, for example, by punching out a single corrugated cardboard sheet using a die or the like. The corrugated cardboard sheet has a structure in which a front liner 9B and a back liner 9C are bonded to a corrugated core 9A, as shown in FIG. 1(B). Note that FIG. 2 shows the front liner 9B side (the outer surface of the box body 1).

[0016] In this specification, as shown in FIG. 1(B), the direction of the corrugation ridges of the corrugated cardboard sheet's core 9A is referred to as the "paper width direction", and the direction orthogonal to the paper width direction (the direction across the corrugations) is referred to as the "flow direction". In FIGS. 1(A) 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 corrugated cardboard sheets. 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 material of the blank 1A may be one with various coatings applied to various paper materials, or may be formed of a resin or the like other than paper. The thickness of the blank 1A is, for example, about 0.35 to 7.0 mm (preferably, about 0.35 to 3.0 mm). When the thickness of the blank 1A is set relatively thin, at about 0.35 to 3.0 mm, the blank is easier to bend. Thereby, the assembly property, packaging efficiency, and bending property can be improved.

[0017] (Blank) As shown in FIG. 2, the blank 1A includes a bottom surface portion 10A, a pair of first side surface portions 11A, a pair of first flaps 12, a pair of second side surface portions 13A, and a pair of second flaps 14.

[0018] The bottom surface portion 10A has a substantially rectangular shape that is long in the X direction (the paper towel direction). The substantially rectangular shape means that it is a rectangular shape within the range of manufacturing errors. A pair of first side surface portions 11A are connected to both ends in the X direction (the first direction) of the bottom surface portion 10A via a first bending line L1. The first flap 12 is connected to the end portions 111A in the X direction of each of the pair of first side surface portions 11A via a second bending line L2. More specifically, the first flap 12 is connected to the end portion 111A on the side opposite to the end portion 112A on the bottom surface portion 10A side among the end portions 111A and 112A facing each other in the X direction of the first side surface portion 11A.

[0019] The first flap 12 has a first connection portion 12a that is connected (joined) to a first extending portion 15 (more specifically, a second connection portion 15a) described later. The first connection portion 12a is demarcated by a first ruled line L11, and the first ruled line L11 extends inclined with respect to the boundary line (the second bending line L2) between the first flap 12 and the first side surface portion 11A from each end of the boundary line (the second bending line L2). More specifically, the first ruled line L11 is inclined so as to approach each other from both ends of the boundary line (the second bending line L2) between the first flap 12 and the first side surface portion 11A toward the tip 121 of the first flap 12. The first ruled line L11 may be a general ruled line, a lead ruled line, or a sewing line.

[0020] The first flap 12 has V-shaped cutouts (recesses) 20a and 20b on the outer edge. The cutouts 2a and 20b are located on the first ruled line L11. More specifically, the cutout 20a is provided at the tip 121 of the first flap 12 and is located on the first ruled line L11. Also, the cutout 20b is provided at the side edge of the first flap 12 and is located on the first ruled line L11. The cutouts 20a and 20b are provided to concentrate the stress acting on the first flap 12 or the second flap 14 on the first ruled line L11.

[0021] A pair of second side sections 13A are connected to both ends of the bottom section 10A in the Y direction (second direction) via a third fold line L3. A second flap 14 is connected to each of the two second side sections 13A in the Y direction ends 131A via a fourth fold line L4. More specifically, the second flap 14 is connected to the end 131A opposite to the end 132A on the bottom section 10A side of the second side section 13A, of the opposing ends 131A and 132A in the Y direction.

[0022] The first extension portion 15 is connected to both ends of the second flap 14 in the X direction via a fifth bent curve L5. In this embodiment, the length of the first extension 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 extension portion 15 in the Y direction may be shorter or longer than the length of the first flap 12 in the X direction.

[0023] The first extension 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 demarcated by a second scribe line L12. The second scribe line L12 extends from one end of the boundary line (fifth fold curve L5) between the first extension portion 15 and the second flap 14, on the side of the second side portion 13A, and inclined to form an obtuse angle with respect to the boundary line (fifth fold curve L5). In other words, the second scribe line L12 extends so that as it moves away from the second flap 14 in the X direction, it approaches the side of the first extension portion 15 that is further away from the bottom portion 10A among the opposing sides in the Y direction.

[0024] In this embodiment, the second crease line L12 is positioned so as to substantially coincide with the first crease line L11 when the box body 1 is assembled. This allows the other flap to be folded in conjunction with the first flap 12 or the second flap 14 when either one is pressed and folded along the second fold curve L2 or the fourth fold curve L4. Furthermore, when the first flap 12 and the second flap 14 are completely folded down (as shown in Figure 4(A)), the second fold curve L2 and the fifth fold curve L5 are positioned substantially on the same plane, thus preventing the box body 1 from bulging in the height direction (Z direction) (the height of the box body 1 from increasing). In other words, the box body 1 can be made flatter when the first flap 12 and the second flap 14 are completely folded down (as shown in Figure 4(A)).

[0025] Furthermore, the first line L11 and the second line L12 are positioned on the left and right (both sides) of each corner of the base portion 10A (the part where the first fold curve L1 and the third fold curve L3 intersect). More specifically, the first line L11 extends from a point on the edge that extends outward from the corner of the base portion 10A in the X direction (the edges of the first side portion 11A and the first flap 12 that are opposite each other in the Y direction), and the second line L12 extends from a point on the edge that extends outward from the corner of the base portion 10A in the Y direction (the edges of the second side portion 13A and the second flap 14 that are opposite each other in the X direction). This allows the first connecting portion 12a and the first extending portion 15 to be joined by pulling them together from both sides, while visually checking the starting point of the first scribe line L11 and the starting point of the second scribe line L12. This prevents misalignment of the joining position and improves assembly efficiency. When the first scribe line L11 and the second scribe line L12 are approximately aligned, misalignment of the joining position can be further suppressed, further improving assembly efficiency.

[0026] The second extension portion 16 is connected to both ends of the second side portion 13A in the X direction via a sixth bend curve L6. The second extension portion 16 is also connected to the Y-direction end of the first extension portion 15 via a seventh bend curve L7.

[0027] Note that the first to seventh folding curves L1 to L7 can be general-purpose lines, lead lines, or perforations, respectively.

[0028] A hole 17, which is elongated in the X direction, is formed at the boundary between the first extended portion 15 and the second extended portion 16. The hole 17 is provided on the boundary line (seventh fold curve L7) between the first extended portion 15 and the second extended portion 16. The hole 17 is provided to allow for the thickness of the corrugated cardboard sheet when the first extended portion 15 and the second extended portion 16 are folded along the seventh fold curve L7 when the box body 1 is assembled.

[0029] Preferably, the direction in which the holes 17 extend is parallel to the paper width direction of the corrugated cardboard sheet. This allows the first extended portion 15 to move more smoothly when the box body 1 is assembled. 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 manufacturing of the blank 1A, thereby improving the manufacturing efficiency of the blank 1A.

[0030] (box body) The box body 1 shown in Figure 1(A) is obtained by assembling a blank 1A having the above configuration. In the box body 1 shown in Figure 1(A), the bottom portion 10A of the blank 1A forms the bottom wall 10, the pair of first side portions 11A form the pair of first side walls 11, and the pair of second side portions 13A form the pair of second side walls 13. Furthermore, the end portion 111A of the first side portion 11A in the blank 1A forms the upper end 111 of the first side wall 11, and the end portion 131A of the second side portion 13A forms the upper end 131 of the second side wall 13. In addition, the fifth bend curve L5 forms the boundary line 141 between the second flap 14 and the first extension portion 15. Note that 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, so in the following description, the upper end 111 of the first side wall 11 may be referred to as the boundary line 111.

[0031] To assemble the box body 1 from the blank 1A, the first side portion 11A and the second side portion 13A are folded along the first fold curve L1 and the third fold curve L3 so that they stand upright relative to the bottom portion 10A, and the first extension portion 15 and the second extension portion 16 are folded inward along the fifth fold curve L5 and the sixth fold curve L6. The order in which the first side portion 11A, the second side portion 13A, the first extension portion 15, and the second extension portion 16 are folded does not matter. When done in this way, as shown in Figure 1(A), the first side 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.

[0032] As shown in Figure 2, when adhesive G is applied to a part of the second connecting portion 15a of the first extension portion 15 (the portion facing the first flap 12), and the first flap 12 is pressed against the surface of the first extension portion 15 to which adhesive G has been applied, the first extension portion 15 and the first flap 12 are joined (fixed). As a result, the state in which the first side portion 11A and the second side portion 13A are erected relative to the bottom portion 10A is maintained. In other words, the first side wall 11 and the second side wall 13 erected relative to the bottom wall 10 can be formed.

[0033] Furthermore, in this embodiment, the first crease line L11 located on the first flap 12 and the second crease line L12 located on the first extension 15 are positioned to substantially coincide when the box body 1 is assembled. Therefore, when pressing the first flap 12 against the adhesive G-coated surface of the first extension 15, by visually confirming that the first crease line L11 and the second crease line L12 substantially coincide while overlapping the first flap 12 and the first extension 15, it is possible to prevent misalignment of the joining position between the first flap 12 and the first extension 15, and to improve assembly efficiency. In addition, since the first flap 12 and the first extension 15 can be joined while confirming the side edge of the first flap 12 and the side edge of the second flap 14, the box body 1 can be assembled while confirming the vertical accuracy of the box body 1. This also improves assembly efficiency. Note that "approximately identical" means that the first grid line L11 and the second grid line L12 may be slightly misaligned within the range of manufacturing and assembly tolerances.

[0034] As the adhesive, hot melt adhesive or water-based emulsion adhesive can be used. Alternatively, instead of adhesive, double-sided tape, staples, or other fasteners may be used to connect the first extended portion 15 and the first flap 12.

[0035] Figure 3(A) is a top view of the box body 1 shown in Figure 1(A) as seen from the +Z direction. In this embodiment, the first extended portion 15 is located inside the first flap 12 in the box body 1. That is, in Figures 1(A) and 3(A), the outer surface 15o of the first extended portion 15 is fixed to the inner surface 12i of the first flap 12. Here, the inner surface 12i is the surface of the first flap 12 that is surrounded by the bottom wall 10, the first side wall 11, and the second side wall 13, and is close to the space in which the packaged goods are contained. The outer surface 15o is the surface of the first extended portion 15 that is farther from the space in which the packaged goods are contained, among the two opposing surfaces 15i and 15o of the first extended portion 15.

[0036] In this embodiment, as shown in Figure 3(A), the outer surface 15o of the first extension portion 15 was fixed to the inner surface 12i of the first flap 12. However, as shown in Figure 3(B), the first extension portion 15 may be positioned outside the first flap 12. In this case, the inner surface 15i of the first extension portion 15 should be fixed to the outer surface 12o of the first flap 12.

[0037] Although an example of applying adhesive to the second connection portion 15a of the first extension portion 15 has been described, the adhesive may be applied to any position on the first extension portion 15 as long as the first extension portion 15 and the first flap 12 can be fixed together. Also, in Figure 2, adhesive G is applied to the second connection portion 15a of the first extension portion 15, but adhesive may also be applied to parts of the first extension portion 15 other than the second connection portion 15a. Furthermore, the adhesive may be applied to the first connection portion 12a of the first flap 12 instead of the second connection portion 15a. In addition to the second connection portion 15a or the first connection portion 12a, adhesive may also be applied to the second extension portion 16 or the first side portion 11A.

[0038] (First grid line L11 and second grid line L12) In the box body 1 described above, a first scribe line L11 is placed on the first flap 12, and a second scribe line L12 is placed on the first extension portion 15, with the first scribe line L11 and the second scribe line L12 being approximately coincident. Furthermore, a notch 20a is provided on the outer edge of the first flap 12 and on the first scribe line L11. The effects of the first scribe line L11 and the second scribe line L12, as well as the effect of the notch 20a, will now be explained.

[0039] When packaging an item using the box body 1 shown in Figure 1(A), the item is placed in the space enclosed by the bottom wall 10, the first side wall 11, and the second side wall 13, and then the first flap 12 and the second flap 14 are closed to form the state shown in Figure 4(A).

[0040] Here, we will explain the behavior of the box body 1 from the state shown in Figure 1(A) to the state shown in Figure 4(A). Figure 4(B) is a perspective view showing the box body 1 in a state between the state shown in Figure 1(A) and the state shown in Figure 4(A). Figures 5(A) and 5(B) are views of the area enclosed by the dotted line in Figure 4(B) from the inside and outside of the box body 1, respectively, showing how the first extended portion 15 and the second extended portion 16 are folded.

[0041] During the packaging process, after placing the items to be packaged inside the box 1 shown in Figure 1(A), the first flap 12 is pushed inward (folded inward) as indicated by arrow AR1 in Figure 4(B). Here, since a notch 20a is provided on the outer edge of the first flap 12 and on the first crease line L11, the stress caused by pressing the first flap 12 is concentrated on the first crease line L11, causing the first flap 12 to fold at the first crease line L11.

[0042] As described above, the first crease L11 on the first flap 12 and the second crease L12 on the first extension 15 are approximately the same (see the left side of Figure 5(A)). Therefore, when the first flap 12 folds along the first crease L11, the first extension 15 also folds along the second crease L12.

[0043] Therefore, as shown in Figures 5(A) and 5(B), the first flap 12 and the first extension 15 are folded along the first and second lines L11 and L12, respectively. As a result, as indicated by arrow AR2 in Figure 4(B), the second flap 14 connected to the first extension 15 is pulled toward the first flap 12, and the second flap 14 can cover the opening of the box body 1.

[0044] As described above, the first flap 12 and the first extended portion 15 are provided with a first crease L11 and a second crease L12, respectively, which facilitates the packaging process.

[0045] Furthermore, in this embodiment, the first scribe line L11 is arranged to intersect the width direction of the corrugated cardboard sheet (see Figure 2). This point will be explained in detail.

[0046] As shown in Figure 1(B), in a corrugated cardboard sheet, the peaks and valleys of the corrugated core 9A are laminated to the front liner 9B and back liner 9C. Therefore, when a crease L31 is applied so as to intersect (perpendicular to) the width direction of the paper, multiple peaks of the core 9A are present beneath the area where the crease L31 is applied, and the crease L31 is supported three-dimensionally. As a result, when a crease is applied so as to intersect the width direction of the paper, a standard-shaped crease can be applied to the front liner 9B or back liner 9C. In addition, deformation of the corrugated cardboard sheet can be suppressed in the areas where the crease is applied so as to intersect the width direction of the paper, and the corrugated cardboard sheet can be folded into a standard shape. Furthermore, even when a crease is applied so as to intersect the width direction of the paper, deformation of the corrugated cardboard material is suppressed, preventing a decrease in strength, and elastic force can be obtained when the corrugated cardboard sheet is folded along the crease.

[0047] On the other hand, when creases L32 are applied parallel to the paper width, the multiple ridges of the core 9A do not support the creases L32, making it difficult to apply standardized creases L32. Therefore, when creases are applied parallel to the paper width, it is difficult to fold the corrugated cardboard sheet into a standard shape at the creased points. Furthermore, the strength of the corrugated cardboard material decreases when creases are applied.

[0048] In this embodiment, the first crease line L11 is positioned to intersect the width direction of the corrugated cardboard sheet. This allows the corrugated cardboard sheet to be folded into a standard shape, preventing a decrease in strength as a corrugated cardboard material. Furthermore, when the first flap 12 is folded along the first crease line L11, the first flap 12 (specifically the first connecting portion 12a) is pushed back in the opposite direction to the folding direction. In other words, 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 was closing the second flap 14 is removed), the first connecting portion 12a of the first flap 12 tries to open outward, and the second flap 14 is also pushed outward, making the unpacking process easier.

[0049] Furthermore, since a hole 17 is provided at the boundary between the first extended portion 15 and the second extended portion 16, the thickness of the corrugated cardboard sheet can be released when the first extended portion 15 is folded together with the first flap 12. This improves the foldability of the first flap 12. In addition, since the hole 17 is located on the seventh fold curve L7, the second flap 14 can be easily opened and closed, and the first flap 12 can also be easily opened and closed.

[0050] As described in detail above, the box body 1 according to this embodiment comprises 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 ends 111 of each of the pair of first side walls 11, a pair of second side walls 13 erected at both ends of the bottom wall 10 in the Y direction (second direction) perpendicular to the X direction, a second flap 14 connected to the upper ends 131 of each of the pair of second side walls 13, and a first extension portion 15 connected to both ends of each of the second flaps 14 in the X direction. The first flap 12 has a first connecting portion 12a that connects to the first extending portion 15, and the first flap 12 has a first scribe line L11 that demarcates the first connecting portion 12a, and each first scribe line L11 extends inclined with respect to the boundary line 111 from each end of the boundary line 111 between the first side wall 11 and the first flap 12.

[0051] In the box body 1 according to this embodiment, the first extended portion 15 and the first flap 12 are joined together, resulting in a larger joining area and improved joining strength compared to the case where the second extended portion 16 and the first side portion 11A are joined together. This makes it possible to more reliably maintain the upright position of the first side wall 11 and the second side wall 13. Furthermore, during assembly, since it is only necessary to join the first flap 12, which is located further from the bottom wall 10 than the first side wall 11 and the second side wall 13, to the first extended portion 15, assembly is easier compared to the case where the first side wall 11, which is closer to the bottom wall 10, and the second extended portion 16 are joined together. Furthermore, since the first crease line L11 is positioned on the first flap 12, when the first flap 12 is pushed inward (folded down), the first flap 12 folds along the first crease line L11, and the second flap 14, which is connected to the first extended portion 15 joined to the first flap 12, also folds inward following the first flap 12. This makes it easy to close the opening and improves packaging efficiency.

[0052] The effects of the box body 1 according to this embodiment will be explained in more detail using the box body 1000 according to the comparative example. Figure 6 is a perspective view of the box body 1000 according to the comparative example. In Figure 6, the upper right part is an enlarged view of the dotted line portion. The box body 1000 differs from the box body 1 in that it does not have a first extension portion 15 and the first scribe line L11 is not provided on the first flap 12. The other configurations are the same as those of the box body 1, so a detailed explanation will be omitted.

[0053] In the box body 1000, when forming the first side wall 11 and the second side wall 13 which are erected against the bottom wall 10, the second extension portion 16 is joined to the first side wall 11 (corresponding to the first side portion 11A in the blank state) (see the enlarged view in 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 portion 16 is joined to the first side wall 11, the joining area is small and the joining force is small, making it difficult to maintain the upright state of the first side wall 11 and the second side wall 13. In other words, because the joining strength between the members that are joined to maintain the upright state of the first side wall 11 and the second side wall 13 (the second extension portion 16 and the first side portion 11A) is low, it is difficult to maintain the upright state of the first side wall 11 and the second side wall 13.

[0054] On the other hand, in this embodiment, since the first extended portion 15 and the first flap 12 are joined, the joining area can be made larger than when the second extended portion 16 and the first side portion 11A are joined, resulting in higher joining strength. Therefore, the upright state of the first side wall 11 and the second side wall 13 can be maintained more reliably. In addition, during assembly, since the first flap 12, which is located further from the bottom wall 10 than the first side wall 11 and the second side wall 13, is joined to the first extended portion 15, assembly is easier compared to when the first side wall 11, which is closer to the bottom wall 10, is joined to the second extended portion 16.

[0055] Furthermore, in this embodiment, the first extended portion 15 has a second scribe line L12 that extends inclined with respect to the boundary line 141 from one end of the boundary line 141 between the second flap 14 and the first extended portion 15, on the side of the second side wall 13. This makes it easier to fold the second connecting portion 15a of the first extended portion 15.

[0056] Furthermore, in this embodiment, the first scribe line L11 substantially coincides with the second scribe line L12. This allows the first flap 12 and the first extension 15 to be joined while substantially aligning the first scribe line L11 and the second scribe line L12, thereby improving ease of assembly. Also, because the first scribe line L11 is positioned on the first flap 12, when the first flap 12 is pushed inward (folded down), the first flap 12 folds inward along the first scribe line L11. Then, the first scribe line L11, which has been folded inward, pushes the second scribe line L12, which is positioned substantially to coincide with the first scribe line L11, inward, causing the second scribe line L12 to bend inward, and the first extension 15 having the second scribe line L12 is pushed inward. As a result, the second flap 14 connected to the first extension 15 also folds inward, following the first flap 12. In this way, the second flap 14 can move more easily in accordance with the first flap 12, so that the opening can be covered by the second flap 14 by folding the first flap 12 inward, thereby improving packaging efficiency. Furthermore, since the first flap 12 and the second flap 14 are folded so that they overlap together, the gap between the first flap 12 and the second flap 14 in the Z direction can be minimized, and bulging at the folded part of the box body 1 can be suppressed. As a result, the flatness of the box body 1 when stacked can be improved.

[0057] Furthermore, in this embodiment, the box body 1 is provided with a second extending portion 16 connected to both ends in the X direction of each of the pair of second side walls 13 and connected to the first extending portion 15, and a hole 17 is formed at the boundary between the first extending portion 15 and the second extending portion 16. This allows the thickness of the corrugated cardboard sheet to be released when the first extending portion 15 is folded together with the first flap 12, thereby improving the foldability of the first flap 12. In addition, the presence of the second extending portion 16 prevents foreign matter such as dust from entering the box body 1 from the outside and prevents the packaged goods from falling out of the box body 1. Furthermore, the second extending portion 16, together with the first side portion 11A at the four corners of the box body 1, forms a double-wall structure, thereby improving the strength of the box body 1.

[0058] Furthermore, in this embodiment, the first flap 12 has a notch (recess) 20a on its outer edge, and the notch 20a is located on the first score line L11. This allows the stress generated in the first flap 12 to be concentrated on the first score line L11, ensuring that the first flap 12 breaks reliably at the first score line L11.

[0059] Furthermore, according to this embodiment, the blank 1A comprises a bottom surface 10A, a pair of first side surfaces 11A connected to both ends of the bottom surface 10A in the X direction via a first fold line L1, a first flap 12 connected to the X-direction ends 111A of each of the pair of first side surfaces 11A, a pair of second side surfaces 13A connected to both ends of the bottom surface 10A in the Y direction perpendicular to the X direction via a third fold line L3, a second flap 14 connected to the Y-direction ends 131A of each of the pair of second side surfaces 13A, and a first extension 15 connected to both ends of each of the second flaps 14 in the X direction via a fifth fold line L5. When the pair of first side sections 11A and the pair of second side sections 13A are folded along the first fold curve L1 and the third fold curve L3 so that they stand upright relative to the bottom surface 10A, and the first extension section 15 is folded inward along the fifth fold curve L5, the first extension section 15 overlaps with the first flap 12. In addition, the first flap 12 has a first scribe line L11 that extends from one end of the boundary line (second fold curve L2) between the first side section 11A and the first flap 12, inclined toward the boundary line (second fold curve L2). As a result, the upright state of the first side wall 11 and the second side wall 13 of the box body 1 can be maintained by joining the first extension section 15 and the first flap 12 while the pair of first side sections 11A and the pair of second side sections 13A are standing upright relative to the bottom surface 10A. Furthermore, during assembly, since the first flap 12 and the first extension 15, which are located further from the bottom wall 10 than the first side wall 11 and the second side wall 13, are joined together, assembly is easier compared to the case where the first side wall 11 and the second extension 16, which are closer to the bottom wall 10, are joined together. In addition, since the first crease line L11 is positioned on the first flap 12, when the first flap 12 of the assembled box body 1 is pushed inward (folded down), the first flap 12 folds along the first crease line L11, and the second flap 14, which is connected to the first extension 15 joined to the first flap 12, also folds inward following the first flap 12. This makes it easy to close the opening and improves packaging efficiency.

[0060] Furthermore, 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 a thinner thickness of about 0.35 to 3.0 mm, the blank becomes easier to fold, further improving assembly, packaging efficiency, and foldability. As a result, 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 synergistically enhanced.

[0061] In the above embodiment, the first crease line L11 and the second crease line L12 were approximately coincident in the box body 1 (see Figure 1), but this is not the only way. Figure 7 shows another example of the box body 1. In Figure 7, the upper right figure is an enlarged view of the area enclosed by the dotted line. As shown in Figure 7, the first crease line L11 and the second crease line L12 do not have to coincide. Even if the first crease line L11 and the second crease line L12 do not coincide, when either the first flap 12 or the second flap 14 is pressed and folded, the other can be folded in conjunction. This improves packaging efficiency. However, as explained in the above embodiment, it is preferable that the first crease line L11 and the second crease line L12 are approximately coincident in order to prevent the height of the box body 1 from becoming too high when the first flap 12 and the second flap 14 are closed (as shown in Figure 4(A)).

[0062] In the above embodiment, the first crease line L11 was placed on the first flap 12 and the second crease line L12 was placed on the first extension 15, but this is not the only possible configuration. For example, the first crease line L11 may be placed on the first flap 12, and the second crease line L12 on the first extension 15 may be omitted. Conversely, the second crease line L12 may be placed on the first extension 15, and the first crease line L11 on the first flap 12 may be omitted. Even in this configuration, when the first flap 12 is folded inward in the box body 1, the second flap 14 connected to the first extension 15 joined to the first flap 12 also folds inward following the first flap 12, covering the opening and thus improving packaging efficiency.

[0063] Furthermore, in the above embodiment, two first crease lines L11 were placed on each of the first flaps 12, for a total of four first crease lines L11, but this is not limited to this. It is sufficient that at least one first crease line L11 is placed on at least one of the first flaps 12. In other words, the total number of first crease lines L11 may be as small as one. Even if there is only one first crease line L11, by pushing the first flap 12 on which the first crease line L11 is placed inward, the first flap 12 folds along the first crease line L11, and the second flap 14 covers the opening in conjunction with the first flap 12, thus making the packaging work more efficient.

[0064] Furthermore, in the above embodiment, the second crease line L12 was placed on each of the first extending portions 15, resulting in a total of four second crease lines L12, but this is not limited to this. The second crease line L12 only needs to be placed on at least one of the first extending portions 15. In other words, the total number of second crease lines L12 may be as small as one. Even if there is only one second crease line L12, by pushing the first flap 12 inward, the first flap 12 connected to the first extending portion 15 on which the second crease line L12 is placed folds along the second crease line L12, and the second flap 14 covers the opening in conjunction with the folded first flap 12, thus making the packaging work more efficient.

[0065] Furthermore, in the above embodiment, the holes 17 were provided at the boundary between the first extended portion 15 and the second extended portion 16, but this is not limited to this. For example, the holes 17 only need to be provided at at least one of the boundary between the first extended portion 15 and the second extended portion 16. By providing the holes 17, the thickness during folding can be relieved, thereby improving the foldability of the first flap 12.

[0066] Furthermore, in the above embodiment, the notches 20a and 20b may be omitted. Also, the notches 20a and 20b may be placed on at least one of the first ruled lines L11.

[0067] Furthermore, in the above embodiment, the lengths of the two second flaps 14 in the Y direction were substantially the same, but this is not limited to this, and the lengths of the two second flaps 14 in the Y direction may be different.

[0068] Furthermore, although the first extension portion 15 and the second extension portion 16 were connected in the above embodiment, they may be separated. Also, as shown in Modification Example 1 below, the second extension portion 16 may be omitted.

[0069] (Variation 1) Figure 8 is a plan view showing a blank box 1B according to the first modified example. In the blank 1B shown in Figure 8, the second extension portion 16 is not provided at both ends of the second side portion 13A in the X direction. Also, in the first extension portion 15, of the two opposing sides in the Y direction, the side 15c on the second side portion 13A side is inclined with respect to the boundary line between the first extension portion 15 and the second flap 14 (fifth fold curve L5) such that the width of the first extension portion 15 in the Y direction narrows towards the tip.

[0070] Furthermore, when the blank 1B is assembled, the side 15c of the first extended portion 15 substantially coincides with the first scribe line L11 placed on the first flap 12.

[0071] Even with this configuration, the same effects as in the embodiment can be achieved.

[0072] In Figure 8, each of the four first extensions 15 has an edge 15c that slopes with respect to the boundary line (fifth fold curve L5) between the first extension 15 and the second flap 14, but it is not limited to this. It is sufficient that in at least one of the four first extensions 15, the edge 15c slopes with respect to the boundary line (fifth fold curve L5) between the first extension 15 and the second flap 14 such that the width of the first extension 15 in the Y direction narrows towards the tip. Even if there is only one side 15c that slopes with respect to the boundary line (fifth fold curve L5) between the first extension 15 and the second flap 14, such that the width of the first extension 15 in the Y direction narrows towards the tip, by pushing the first flap 12 inward, the first flap 12 connected to the first extension 15 having the side 15c folds along the side 15c, and the second flap 14 covers the opening in conjunction with the folded first flap 12, thus making the packaging work more efficient.

[0073] (Modification 2) Figure 9 is a plan view showing the blank 1C of the box body according to Modification 2, and Figure 10 is a perspective view showing the box body 1c assembled from the blank 1C.

[0074] In the embodiment, the second flap 14 was connected to each end 131A of a pair of second side portions 13A. However, in the modified example 2, as shown in Figures 9 and 10, the second flap 14 is connected to only one end 131A of the pair of second side portions 13A.

[0075] The first scribe line L11 positioned on the first flap 12 extends from one end of the boundary line (second fold line L2) between the first side portion 11A and the first flap 12 on the second flap 14 side, inclined with respect to the said boundary line (second fold line L2). The other configurations are the same as in the embodiment.

[0076] Thus, even when the second flap 14 is connected to only one end 131A of the pair of second side portions 13A, the same effects as in the embodiment can be obtained.

[0077] The above embodiments and their modifications describe a box body with low heights for the first side wall 11 and the second side wall 13, but the invention is not limited thereto. The above embodiments and their modifications are also applicable to a box body with high heights for the first side wall 11 and the second side wall 13.

[0078] The embodiments described above are preferred examples of the present invention. However, the invention is not limited thereto, and various modifications are possible without departing from the spirit of the invention. [Explanation of Symbols]

[0079] 1,1c box body 1A, 1B, 1C Blank 10 Bottom wall 10A bottom part 11. First side wall 11A 1st side part 12. First flap 12a First connection section 12i Inner surface of the first flap 12o Outer surface of the first flap 13. Second side wall 13A 2nd side part 14. Second flap 15 1st extension part 15a Second connection section 15c Edge of the first extension 16 Second extension part 17 holes 20a Notch 111 Upper end of the first side wall 111A End of the first side section 131 Upper end of the second side wall 131A End of the second side section L1 1st folding line L2 2nd fold curve L3 3rd fold curve L5 5th fold curve L11 First grid line L12 Second grid line

Claims

1. A 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 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 the second direction perpendicular to the first direction, a second flap connected to the upper ends of each of the pair of second side walls, a first extension part connected to both ends of each of the second flaps in the first direction, comprising: The first flap has a connecting part that connects to the first extension part, At least one first grid line that partitions the connecting part is arranged on at least one of the first flaps, The first grid line extends obliquely from one end of the first boundary line between the first side wall and the at least one first flap with respect to the first boundary line, The first extension part is fixed to the inner surface of the first flap at the connecting part, A box body.

2. A 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 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 the second direction perpendicular to the first direction, a second flap connected to the upper ends of each of the pair of second side walls, a first extension part connected to both ends of each of the second flaps in the first direction, comprising: The first flap has a connecting part that connects to the first extension part, At least one first grid line that partitions the connecting part is arranged on at least one of the first flaps, The first grid line extends obliquely from one end of the first boundary line between the first side wall and the at least one first flap with respect to the first boundary line, On at least one of the first extension parts, a second grid line that extends obliquely with respect to the second boundary line is arranged starting from one end 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, or, among the two opposite sides of the at least one first extension part in the second direction, the side on the second side wall side is inclined with respect to the second boundary line such that the width of the at least one first extension part in the second direction becomes narrower towards the tip, A box body. [[ID= ​ ​ ​ ​ The box body according to claim 2 or claim 3.

5. It is provided with a second extending portion that is continuously provided at both ends of each of the pair of second side walls in the first direction and is continuously provided with the first extending portion, A hole is formed in at least one of the boundary portions between the first extending portion and the second extending portion. The box body according to claim 4.

6. The at least one first flap has a recess on its outer edge, The recess is located on the first ruled line. The box body according to claim 5.

7. A bottom wall, A pair of first side walls erected at both ends of the bottom wall in the first direction, A first flap continuously provided at 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 the second direction orthogonal to the first direction, A second flap continuously provided at the upper end of one of the pair of second side walls, A first extending portion continuously provided at both ends of the second flap in the first direction, Comprising, The first flap has a connecting portion that connects to the extending portion, At least one ruled line for partitioning the connecting portion is arranged on at least one of the first flaps, The ruled line extends obliquely from one end of the boundary line between the first side wall and the first flap with respect to the boundary line, The first extending portion is fixed to the inner surface of the first flap at the connecting portion. Box body.

8. A bottom wall, A pair of first side walls erected at both ends of the bottom wall in the first direction, A first flap continuously provided at 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 the second direction orthogonal to the first direction, A second flap continuously provided at the upper end of one of the pair of second side walls, A first extending portion continuously provided at both ends of the second flap in the first direction, Comprising, The first flap has a connecting portion that connects to the first extending portion, At least one ruled line for partitioning the connecting portion is arranged on at least one of the first flaps, The ruled line extends obliquely from one end of the boundary line between the first side wall and the first flap with respect to the boundary line. In at least one of the first extending portions, a second scribe line is provided that extends inclined with respect to the second boundary line from one end on the second sidewall side of the second boundary line between the second flap and the at least one first extending portion, or, of the two opposing sides of the at least one first extending portion in the second direction, the side on the second sidewall side is inclined with respect to the second boundary line such that the width of the at least one first extending portion in the second direction narrows towards the tip. Box body.

9. The bottom part, A pair of first side surfaces are connected to both ends of the bottom surface in the first direction via a first bend, A first flap is provided connected to the end of each of the pair of first side portions in the first direction via a second bend, A pair of second side portions are provided at both ends of the bottom portion in a second direction perpendicular to the first direction via a third bend, A second flap is provided connected to the end of each of the pair of second side portions in the second direction via a fourth bend, A first extension portion is provided connected to both ends of each of the second flaps in the first direction via a fifth bend, Equipped with, When the pair of first side portions and the pair of second side portions are folded along the first and third fold lines so that they stand upright relative to the bottom portion, and the first extension portion is folded inward along the fifth fold line, the first extension portion overlaps with the first flap and is fixed to the inner surface of the first flap. A first scribe line is provided on at least one of the first flaps, extending inclined with respect to the second fold curve from one end of the second fold curve between the first side portion and the at least one first flap. blank.

10. The bottom portion and A pair of first side surfaces are connected to both ends of the bottom surface in the first direction via a first bend, A first flap is provided connected to the end of each of the pair of first side portions in the first direction via a second bend, A pair of second side portions are provided at both ends of the bottom portion in a second direction perpendicular to the first direction via a third bend, A second flap is provided connected to the end of each of the pair of second side portions in the second direction via a fourth bend, A first extension portion is provided connected to both ends of each of the second flaps in the first direction via a fifth bend, Equipped with, When the pair of first side portions and the pair of second side portions are folded along the first and third fold lines so that they stand upright relative to the bottom portion, and the first extension portion is folded inward along the fifth fold line, the first extension portion overlaps with the first flap, A first scribe line is provided on at least one of the first flaps, extending inclined with respect to the second fold line from one end of the second fold line between the first side portion and the at least one first flap. At least one of the first extending portions has a second scribe line that extends inclined with respect to the fourth fold line from one end on the second side of the fifth fold line between the second flap and the at least one first extending portion, or the side on the second side of the two opposing sides of the at least one first extending portion in the second direction is inclined with respect to the fourth fold line such that the width of the at least one first extending portion in the first direction narrows towards the tip. blank.

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