Storage box

Abstract

To provide storage boxes which are hard to collapse even when stacked and can improve stackability.SOLUTION: Each storage box 10 comprises a bottom plate 25, a front plate 21, a rear plate 22 and a pair of right and left side plates, and the pair of side plates include a third right side plate 53F and a third left side plate 54F. The storage box 10 comprises a fold line LT1 connecting the bottom plate 25, the third right side plate 53F and the third left side plate 54F. The fold line LT1 is formed in such a manner that, when a virtual straight line 61 connecting a front side end part 61F and a rear side end part 61B of the bottom plate 25 is assumed, it passes from the front side end part 61F through the third right side plate 53F and the third left side plate 54R rather than the virtual straight line 61, and reaches the rear side end part 61B.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a containment box. [Background technology]

[0002] For example, Patent Document 1 describes a storage box including a main body that stores a wrap film roll as a storage item and a lid that opens and closes an opening defined on the top surface of the main body. Specifically, the main body has a rectangular parallelepiped shape with an open top. The main body includes a front panel, a rear panel, a right side panel, a left side panel, and a bottom panel. The lid includes a top cover panel, a cover flap, a right side panel of the lid, and a left side panel of the lid. The top cover panel rotates relative to the main body around the upper edge of the rear panel as an axis to open and close the opening defined on the top surface of the main body. A storage box configured in this manner is manufactured by molding a blank with creases formed on paperboard. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-34866 Summary of the Invention [Problem to be solved by the invention]

[0004] In such a storage box, each fold line constituting the storage box is formed in a straight line. When the blank is folded along the fold lines, distortions remain as the fold lines return to their original shape, causing each surface of the storage box to tend to bulge outward. For example, in the main body, when the side panels are folded relative to the bottom panel along the fold lines, the bottom panel tends to bulge outward relative to the side panels. Also, in the lid, when the lid side panels are folded relative to the top lid panel along the lid fold lines, the top lid panel tends to bulge outward relative to the lid side panels.

[0005] When such storage boxes are displayed as merchandise in stores, they are often stacked one on top of the other. In this case, if at least one of the bottom plates and top lid plates of two storage boxes stacked one above the other bulges outward, the storage box stacked above the lower storage box becomes unstable. If the stack of storage boxes is unstable, there is a risk that the remaining storage boxes will collapse when one storage box is removed. [Means for solving the problem]

[0006] The storage box for solving the above problem is a storage box comprising a bottom plate, a front plate, a rear plate, and a pair of side plates on the left and right, and has fold lines connecting the bottom plate and the side plates, with the direction from one side plate to the other side plate being the length direction, and the fold lines are formed so that when an imaginary straight line is imagined connecting the front end, which is the end of the bottom plate on the front plate side in the length direction, and the rear end, which is the end of the bottom plate on the rear plate side in the length direction, at least one of the fold lines runs from the front end, passing closer to the side plate than the imaginary straight line, to the rear end.

[0007] According to the above configuration, the portion of the bottom plate adjacent to the crease is recessed by folding along the crease, and the center portion of the bottom plate in the longitudinal direction is also recessed due to this recess. Therefore, the bottom plate can be formed with a smoother bottom surface by suppressing outward bulging. This makes it less likely for the storage boxes to collapse when stacked, improving stackability.

[0008] In the storage box, the fold lines may be configured to include at least a half-slit line, a perforation line, or a combination of the half-slit line and the perforation line. According to this configuration, the side panels are easily bent relative to the bottom panel at the fold lines that include the half-slit line, the perforation line, or a combination of the half-slit line and the perforation line. This reduces variation in the bending position of the side panels relative to the bottom panel, thereby preventing the bottom panel from bulging outward.

[0009] In the above-mentioned storage box, the fold line may include a front line portion extending from the front end toward the rear end, a rear line portion extending from the rear end toward the front end, and an intermediate line portion located between the front line portion and the rear line portion, and at least a portion of the intermediate line portion may be configured to have any of the half-cut line, the perforation line, or a combination of the half-cut line and the perforation line.

[0010] According to the above configuration, the intermediate crease portion includes any one of a half-score line, a perforation line, or a combination of a half-score line and a perforation line, making it easier to fold the side panel relative to the bottom panel at that position. Because the intermediate crease portion includes the portion farthest from the imaginary line, it is less likely to bend due to distortion when bending. The intermediate crease portion includes any one of a half-score line, a perforation line, or a combination of a half-score line and a perforation line, making it possible to stably fold the side panel. As a result, variation in the bending position of the side panel relative to the bottom panel can be reduced, which in turn can prevent the bottom panel from bulging outward.

[0011] In the above-mentioned storage box, the length of the intermediate crease portion may be 10% or more and 90% or less of the total length of the crease from the front end to the rear end, the length of any of the half-cut line, the perforation line, or a combination of the half-cut line and the perforation line in the intermediate crease portion may be 10% or more and 90% or less of the total length of the crease from the front end to the rear end, and the length of each of the front crease portion and the rear crease portion may be 5% or more and 45% or less.

[0012] According to the above configuration, the length of the intermediate crease portion is 10% to 90% of the total length from the front end to the rear end. Also, the length of any of the half-cut line, perforation line, or combination of half-cut line and perforation line in the intermediate crease portion is 10% to 90% of the total length of the fold line from the front end to the rear end.

[0013] If the length of the intermediate score line is less than 10% of the total length from the front end to the back end, when the side panel is bent relative to the bottom panel, distortion occurs during bending, causing the side panel to break at a position close to the imaginary straight line (the bend will be shallow), resulting in variation in the bending position of the side panel.

[0014] Furthermore, if the length of any of the half-cut lines, perforation lines, or combinations of half-cut lines and perforation lines in the intermediate crease portion is less than 10% of the total length of the fold line from the front end to the back end, the half-cut lines or perforation lines formed in the intermediate crease portion will be too short, and when the side panel is bent relative to the bottom panel, distortion will occur during bending, causing the side panel to break at a position close to the imaginary straight line (the bend will be shallow), resulting in variation in the bending position of the side panel.

[0015] Furthermore, if the length of the intermediate crease portion is greater than 90% of the total length from the front end to the back end, the intermediate crease portion will be too long. If the intermediate crease portion is too long, the interior angle between the imaginary line and the front crease portion connecting to one end of the intermediate crease portion and the interior angle between the imaginary line and the back crease portion connecting to the other end of the intermediate crease portion will become large, and when the side panels are bent relative to the bottom panel, distortion will occur during bending, causing variations in the bending position of the side panels.

[0016] Furthermore, if the length of any of the half-cut lines, perforation lines, or combinations of half-cut lines and perforation lines in the intermediate crease portion is greater than 90% of the total length of the fold line from the front end to the rear end, the half-cut lines or perforation lines formed in the intermediate crease portion will be too long, and when the side panel is bent relative to the bottom panel, the cardboard will tear or curl up at the crease line, and the required strength will not be obtained at the bent portion.

[0017] Furthermore, if the length of each of the front and back creases relative to the entire length from the front end to the back end is less than 5%, the intermediate creases will be too long, increasing the interior angles between the front creases and the imaginary line and the interior angles between the back creases and the imaginary line, resulting in variations in the bending position of the side panels when they are bent relative to the bottom panel due to distortion during bending.Furthermore, if the length of each of the front and back creases relative to the entire length from the front end to the back end is more than 45%, the intermediate creases will be too short, resulting in shallow bending relative to the bottom panel and variations in the bending position of the side panels.

[0018] By making the length of the intermediate crease 10% to 90% of the total length of the crease from the front end to the rear end, making the length of any of the half-cut lines, perforation lines, and combinations of half-cut lines and perforation lines in the intermediate crease 10% to 90% of the total length of the crease from the front end to the rear end, and making the length of each of the front and rear creases 5% to 45%, it is possible to obtain the necessary strength at the bending portion of the side panels relative to the bottom panel while suppressing variation in the bending position of the side panels and bending the side panels relative to the bottom panel, thereby suppressing outward bulging of the bottom panel.

[0019] In the above-mentioned storage box, either one of the ratio of the length of the front lined portion to the length of the rear lined portion (length of the front lined portion / length of the rear lined portion) and the ratio of the length of the rear lined portion to the length of the front lined portion (length of the rear lined portion / length of the front lined portion) may be 0.33 or more and 1.00 or less.

[0020] According to the above configuration, if the ratio of the length of the front crease to the length of the rear crease or the ratio of the length of the rear crease to the length of the front crease is outside the range of 0.33 to 1.00, the position of the intermediate crease will be too far toward the front or rear panel. This makes it difficult to form a recess in the bottom panel adjacent to the fold line, and also in the center of the bottom panel in the longitudinal direction. As a result, it is difficult to suppress outward bulging of the bottom panel, making it difficult to improve stackability.

[0021] By setting the ratio of the length of the front crease to the length of the rear crease or the ratio of the length of the rear crease to the length of the front crease to be 0.33 or more and 1.00 or less, the portion of the bottom plate adjacent to the fold line can be recessed, and the center portion of the bottom plate in the longitudinal direction can also be recessed due to this recess. As a result, the bottom plate is prevented from bulging outward, improving stackability.

[0022] In the storage box, the crease may be any one of a straight line, a curved line, or a combination of a straight line and a curved line. According to the above configuration, the crease may be any one of a straight line, a curved line, or a combination of a straight line and a curved line, which may cause a portion of the bottom plate adjacent to the crease to be recessed, thereby preventing the bottom plate from bulging outward.

[0023] In the above-mentioned storage box, the length of the perpendicular line extending from the position of the fold line farthest from the imaginary line to the imaginary line may be 0.5 mm or more and 5.0 mm or less. According to the above-mentioned configuration, if the length of the perpendicular line extending from the position of the fold line farthest from the imaginary line to the imaginary line is less than 0.5 mm, the imaginary line and the fold line are too close, making it impossible to recess the portion of the bottom plate adjacent to the fold line. If the length of the perpendicular line extending from the position of the fold line farthest from the imaginary line to the imaginary line is more than 5.0 mm, the recess in the portion of the bottom plate adjacent to the fold line becomes too large, making it impossible to firmly bend the side panels relative to the bottom plate along the fold line.

[0024] By setting the length of the perpendicular line extending from the position of the fold line farthest from the imaginary line to 0.5 mm or more and 5.0 mm or less, a recess of the required size can be formed in the part of the base plate adjacent to the fold line, thereby suppressing the base plate from bulging outward.

[0025] The storage box for solving the above problem is a storage box comprising a main body portion having a bottom plate, a front plate, a rear plate, and a pair of left and right side plates, and defining an opening on the top surface for putting in and taking out stored items, and a lid portion for opening and closing the opening, wherein the lid portion comprises a top cover plate connected to the rear plate and closing the opening, a front cover plate connected to the top cover plate and overlapping the outside of the front plate when the top cover plate closes the opening, a pair of left and right cover side plates overlapping the outside of the side plates when the top cover plate closes the opening, and a top cover plate and a lid folding line connecting the lid side panel, the direction from one side panel to the other side panel being the length direction, and the lid folding line is formed so that when an imaginary straight line connecting a front lid end which is the end of the top lid panel on the front lid panel side in the length direction and a rear lid end which is the end of the top lid panel on the rear panel side in the length direction is imagined, at least one of the lid folding lines runs from the front lid end, passing through the lid side panel side of the imaginary straight line, to the rear lid end.

[0026] According to the above configuration, the portion of the lid plate adjacent to the lid fold line is recessed by bending along the lid fold line, and the central portion of the lid plate in the longitudinal direction can also be recessed due to this recess. Therefore, the lid plate can be formed with a smoother lid surface (top surface) by suppressing outward bulging. This makes it less likely for the storage boxes to collapse when stacked, improving stackability. [Effects of the Invention]

[0027] According to the present disclosure, storage boxes are less likely to collapse when stacked, improving stackability. [Brief explanation of the drawings]

[0028] [Figure 1] FIG. 1 is a perspective view of a storage box before opening, as viewed from above on the front right side, in the first embodiment. [Figure 2] FIG. 2 is a perspective view of the storage box after opening, seen from above on the front left side, in the first embodiment. [Figure 3] FIG. 3 is a plan view showing an intermediate product for manufacturing a storage box in the first embodiment. [Figure 4] FIG. 4 is a plan view showing the folding lines between the side panels and the bottom panel in the first embodiment. [Figure 5] FIG. 5 is a perspective view of the side panel portion of the storage box in the first embodiment, viewed from below on the front right side. [Figure 6] FIG. 6 is a side view showing a state in which the storage boxes are stacked before being opened in the first embodiment. [Figure 7] FIG. 7 is a plan view showing the folding lines between the lid body side plates and the top lid plate in the second embodiment. [Figure 8] FIG. 8 is a perspective view of the side panel of the lid of the storage box in the second embodiment, viewed from above on the front right side. DETAILED DESCRIPTION OF THE INVENTION

[0029] An embodiment of the storage box will be described with reference to Figures 1 to 8. First, the overall configuration of the storage box will be described with reference to Figures 1, 2, and 3. [First embodiment] [Overall configuration] As shown in FIG. 1, the storage box 10 has a rectangular parallelepiped shape extending in one direction. The storage box 10 is manufactured by folding and adhering an intermediate body (see FIG. 3) made of, for example, a sheet of cardboard such as coated cardboard. The storage box 10 includes a main body 20 and a lid 30. As shown in FIG. 2, the main body 20 accommodates an item, such as a wrap film roll (hereinafter simply referred to as roll 50R). The roll 50R includes a paper cylinder 50C that serves as a core material, and a wrap film 50, which is an example of a long object. The wrap film 50 is wrapped around the cylinder 50C. The length of the cylinder 50C in the axial direction A is longer than the length of the wrap film 50 in the left-right direction (length direction DL). Both ends of the cylinder 50C in the axial direction A protrude beyond the film ends of the wrapped wrap film 50.

[0030] [Storage Box 10] The storage box 10 includes a main body 20 and a lid 30. The main body 20 has a rectangular parallelepiped shape with an open top. The main body 20 includes a front panel 21, a rear panel 22, a right side panel 23, a left side panel 24, and a bottom panel 25. The right side panel 23 and the left side panel 24 form a pair of side panels on the left and right. The front panel 21, the rear panel 22, the right side panel 23, and the left side panel 24 stand upright from the bottom panel 25 and form a single peripheral wall.

[0031] The material constituting the main body 20 and the lid 30 is not particularly limited, and may be, for example, cardboard, a laminated board made of multiple layers of cardboard, or a single sheet of cardboard. From the viewpoint of ease of handling during the manufacture of the storage box 10, the material constituting the main body 20 and the lid 30 is preferably paperboard such as coated cardboard.

[0032] As shown in Figure 2, opening 20T of main body 20 is defined by the upper edge of the peripheral wall. Rolled body 50R is inserted and removed through opening 20T. Axial direction A of rolled body 50R is approximately parallel to the extension direction of storage box 10. Wrap film 50 is, for example, a film made from any one material selected from the group consisting of polyvinylidene chloride, polyvinyl chloride, polyethylene, and polymethylpentene, or a multilayer film made from a combination of these materials, but is not limited to these.

[0033] In the following description, the side of the opening 20T relative to the bottom plate 25 will be referred to as the upper side, and the side of the bottom plate 25 relative to the opening 20T will be referred to as the lower side. The side of the back plate 22 relative to the front plate 21 will be referred to as the rear side, and the side of the front plate 21 relative to the rear plate 22 will be referred to as the front side. The side of the left side plate 24 relative to the right side plate 23 will be referred to as the left side, and the side of the right side plate 23 relative to the left side plate 24 will be referred to as the right side. The direction from the front plate 21 to the back plate 22 is the width direction DW. The direction from the bottom plate 25 toward the opening 20T is the height direction DH. The direction from the right side plate 23 toward the left side plate 24 and the direction from the left side plate 24 toward the right side plate 23 are the length direction DL.

[0034] [Main body 20] 2, the front plate 21, the rear plate 22, and the bottom plate 25 each have a rectangular plate shape extending in the length direction DL. The front plate 21 and the rear plate 22 face each other in the front-to-rear direction. The front edge of the bottom plate 25 is the lower edge of the front plate 21, and the rear edge of the bottom plate 25 is the lower edge of the rear plate 22. Furthermore, the edge of the front plate 21 extending in the height direction DH is the front plate short side, and the edge of the rear plate 22 extending in the height direction DH is the rear plate short side.

[0035] The right and left side panels 23, 24 are rectangular and face each other in the longitudinal direction DL. The bottom edge of the right side panel 23 is connected to the bottom edge of the front panel 21, the bottom edge of the back panel 22, and the right edge of the bottom panel 25. The bottom edge of the left side panel 24 is also connected to the bottom edge of the front panel 21, the bottom edge of the back panel 22, and the left edge of the bottom panel 25.

[0036] The front plate 21 includes a sub-front plate 21A (see Figure 3) and a main front plate 21B (see Figure 3). The sub-front plate 21A forms the inner surface of the main body 20. The main front plate 21B forms the outer surface of the front plate 21. The sub-front plate 21A is connected to the main front plate 21B at an upper edge 21T (see Figure 3) of the main front plate 21B. The sub-front plate 21A is bent toward the inside of the main body 20 at the upper edge 21T relative to the main front plate 21B. The outer surface of the main front plate 21B includes a temporary fastening portion 21S for temporarily fastening the wrap film 50.

[0037] The main front panel 21B has a pair of front panel flaps 21F on the left and right. The front panel flaps 21F are positioned closer to the upper side 21T of the main front panel 21B than the center in the height direction DH of the main front panel 21B, so as to sandwich the temporary fastening portion 21S in the length direction DL.

[0038] The front flap 21F is surrounded by a portion of the top edge 21T of the main front plate 21B and a curved cut line 21FC with both ends at that portion. The cut line 21FC has an arc shape that convex downward from one end of the top edge 21T of the main front plate 21B to the other end. When the lid portion 30 is opened, the front flap 21F rotates to the front side of the body portion 20 and rises up from the main front plate 21B. The front flap 21F that rises up from the main front plate 21B causes the cut end of the wrap film 50, which has been pulled out of the opening 20T and cut, to rise up from the main front plate 21B.

[0039] The temporary fastening portion 21S has a plurality of rectangular temporary fastening elements aligned in the length direction DL. The temporary fastening portion 21S is located on the outer surface of the main front panel 21B closer to the top edge 21T than the center in the height direction DH, and includes the center in the length direction DL. The temporary fastening portion 21S is preferably formed from UV varnish, but is not limited to this as long as it can temporarily fasten the wrap film 50. The temporary fastening portion 21S temporarily fastens the wrap film 50, which is pulled out from the opening 20T of the main body 20 and hangs down from the top edge 21T of the main front panel 21B, to the outer surface of the front panel 21.

[0040] The upper part of the secondary front panel 21A is provided with restricting pieces 3R, 4R extending in the front-to-rear direction. The restricting pieces 3R, 4R are located at both left and right ends of the upper edge of the secondary front panel 21A. The restricting pieces 3R, 4R are folded from the upper edge of the secondary front panel 21A along the crease LR. When the wrap film 50 is pulled out of the main body 20, the restricting pieces 3R, 4R come into contact with the cylindrical body 50C of the rolled body 50R from the upper front side. In this way, the restricting pieces 3R, 4R prevent the rolled body 50R from jumping out of the main body 20.

[0041] The right side panel 23 includes a first right side panel 13F, a second right side panel 23F, and a third right side panel 53F. The left side panel 24 includes a first left side panel 14F, a second left side panel 24F, and a third left side panel 54F. The first right side panel 13F and the second right side panel 23F form the inner surface of the main body 20. The first left side panel 14F and the second left side panel 24F form the inner surface of the main body 20. The third right side panel 53F and the third left side panel 54F form the outer surface of the main body 20. The first right side panel 13F is located more inward of the main body 20 than the second right side panel 23F. The first left side panel 14F is located more inward of the main body 20 than the second left side panel 24F.

[0042] The right side panel 23 is provided with a lid locking piece 3T extending in the front-to-rear direction. The left side panel 24 is provided with a lid locking piece 4T extending in the front-to-rear direction. The lid locking piece 3T is connected to the upper edge 3E of the third right side panel 53F constituting the right side panel 23. The lid locking piece 3T is folded outward (to the right) of the main body 20 at the third side panel fold line LT3, which is the upper edge 3E of the third right side panel 53F, and protrudes to the right side of the main body 20. The lid locking piece 3T extends in the front-to-rear direction. The lid locking piece 4T is connected to the upper edge 4E of the third left side panel 54F constituting the left side panel 24. The lid locking piece 4T is folded outward (to the left) of the main body 20 at the third side panel fold line LT3, which is the upper edge 4E of the third left side panel 54F, and protrudes to the left side of the main body 20. The lid locking piece 4T extends in the front-to-rear direction.

[0043] [Lid part 30] The lid part 30 includes a top lid plate 31, a front lid plate 32, a lid right side plate 33, and a lid left side plate 34. The top lid plate 31 is rotatably connected to the top edge 22T of the rear plate 22. The top lid plate 31 rotates relative to the main body part 20 around the top edge 22T of the rear plate 22 as an axis, thereby opening and closing the opening 20T of the main body part 20.

[0044] The front cover plate 32 and the front plate 21 have substantially the same rectangular plate shape. The upper edge of the front cover plate 32 is the front edge of the upper cover plate 31. The front cover plate 32 covers the entire outer surface of the front plate 21 when the lid portion 30 is closing the opening 20T. The front cover plate 32 has multiple semicircular cutouts 32C below the middle in the height direction DH. The inner surfaces of the cutouts 32C are bonded to the outer surface of the front plate 21. The front cover plate 32 has a perforation line 32M at approximately the center in the height direction DH that spans the entire width in the length direction DL. The perforation line 32M has a downwardly convex shape. The right end of the perforation line 32M is an opening edge 32N for dividing the front cover plate 32 into upper and lower parts along the perforation line 32M.

[0045] When the opening end 32N is pulled forward, the front cover plate 32 is cut along the perforation line 32M. The adhesive between the front plate 21 and the front cover plate 32 is also peeled off at the notch 32C. As a result, the entire width of the front cover plate 32 in the longitudinal direction DL is divided into a lower side and an upper side by the perforation line 32M. The upper side of the front cover plate 32 defined by the perforation line 32M is the cover plate 32P. The lower side of the front cover plate 32 defined by the perforation line 32M is the tear-off piece 32K.

[0046] When the wrap film 50 is first used, the tear-off piece 32K is cut off from the main body 20. When the tear-off piece 32K is cut off from the lid 30, the entire cutting edge of the cutting blade 35 is exposed from the lower edge of the cover plate 32P. Then, the lid 30 rotates on the upper edge 22T of the back plate 22, opening 20T of the main body 20.

[0047] When the lid portion 30 closes the opening 20T, the cover plate 32P has a plate shape that extends downward from the front edge of the upper cover plate 31 and covers the upper outer surface of the front plate 21. The width of the cover plate 32P in the height direction DH is longest at the center in the length direction DL, excluding both ends in the length direction DL, and the width in the height direction DH decreases as one moves from the center to each end in the length direction DL.

[0048] A cutting blade 35 is bonded to the inner surface of the cover plate 32P (see FIG. 2). The cutting blade 35 has a sawtooth shape with cutting edges aligned in the longitudinal direction DL. The cutting blade 35 is bonded to the cover plate 32P so that multiple cutting edges protrude downward from the cover plate 32P when the cover 30 closes the opening 20T. The cutting blade 35 can be bonded to the cover plate 32P, for example, by ultrasonic bonding with a sealant or adhesive layer interposed between the cover plate 32P and the cutting blade 35. Alternatively, the cutting blade 35 can be bonded to the cover plate 32P by laminating a sealant layer on a resin layer of the blade material that constitutes the cutting blade 35, but this is not limiting.

[0049] The material constituting the cutting blade 35 is not particularly limited and may be, for example, resin or metal. The cutting blade 35 contains, for example, resin and an additive, and the rigidity of the cutting blade 35 and the adhesiveness of the cutting blade 35 to the cover plate 32P can be adjusted depending on the type and amount of the additive.

[0050] The resin constituting the cutting blade 35 is, for example, a polyester resin such as polylactic acid or polyethylene terephthalate, polyethylene, polypropylene, polystyrene, acetal resin, polyphenylene sulfide, PEEK (polyether ether ketone) resin, or PES (polyether sulfone) resin. The additive constituting the cutting blade 35 is, for example, a resin such as an olefin-based resin, or an inorganic material such as barium sulfate, calcium carbonate, titanium oxide, silica, or talc. The resin constituting the sealant layer is, for example, a modified polyolefin in which a functional group is introduced into polyolefin to impart adhesiveness.

[0051] The right lid side plate 33 includes a right lid side plate 33F and a joint piece 323. The left lid side plate 34 includes a left lid side plate 34F and a joint piece 324. The right lid side plate 33F is connected to the top lid plate 31 at a short side that is the intersection line between the top lid plate 31 and the right lid side plate 33F. The left lid side plate 34F is connected to the top lid plate 31 at a short side that is the intersection line between the top lid plate 31 and the left lid side plate 34F. The short side that is the intersection line between the top lid plate 31 and each lid side plate 33F, 34F is a lid fold line LT2, which will be described later.

[0052] In the right lid side panel 33 and the left lid side panel 34, the lid side panels 33F, 34F form the outer surface of the lid portion 30. The joining pieces 323, 324 form the inner surface of the lid portion 30. The right lid side panel 33 and the left lid side panel 34 cover the upper part of the outer surface of the right side panel 23 and also cover the upper part of the outer surface of the left side panel 24 when the lid portion 30 is closing the opening 20T.

[0053] As shown in FIG. 2, the joint piece 323 is positioned with a gap between it and the short side of the top cover plate 31, which is the intersection line between the top cover plate 31 and the right cover side plate 33F. The joint piece 324 is also positioned with a gap between it and the short side of the top cover plate 31 and the left cover side plate 34F, which is the intersection line between the top cover plate 31 and the left cover side plate 34F. As a result, the joint pieces 323, 324 are positioned with a gap between them and the top cover plate 31, forming step portions 33S, 34S on the inner surfaces of the right cover side plate 33 and the left cover side plate 34. When the cover 30 closes the opening 20T, the above-mentioned cover locking pieces 3T, 4T fit into the step portions 33S, 34S, generating a clicking sound when the cover 30 closes the opening 20T. By engaging with the step portions 33S, 34S, the cover locking pieces 3T, 4T can prevent the top cover plate 31 from lifting up when the cover 30 is closed.

[0054] [Assembly of the storage box] In assembling the storage box, first, the intermediate body of the storage box 10 is folded such that the secondary front panel 21A is positioned more inward of the main front panel 21B in the main body 20 than the main front panel 21B at the upper edge 21T. At the same time, the secondary front panel 21A is attached to the inside of the main front panel 21B. Next, the intermediate body of the storage box 10 is folded such that the bottom panel 25 is folded relative to the rear panel 22 along the crease L, and the front cover panel 32 is folded relative to the top cover panel 31 along the crease L. The front cover panel 32 is then placed on top of the main front panel 21B, and the lower part of the main front panel 21B and the cutout piece 32K are adhered so that they can be peeled off during use. As a result, the intermediate body of the storage box 10 is formed into a flattened rectangular tube. Next, the intermediate body of the storage box 10 is folded along the crease L so that the main front panel 21B and the rear panel 22 stand up relative to the bottom panel 25. As a result, the intermediate body of the storage box 10 is formed into a rectangular tubular shape.

[0055] Next, the first right side panel 13F is folded relative to the back panel 22 along the fold line LT, the second right side panel 23F is folded relative to the front main panel 21B along the fold line LT, and the third right side panel 53F is folded relative to the bottom panel 25 along the fold line LT1. The second right side panel 23F is then folded onto the outside of the first right side panel 13F, and the third right side panel 53F is folded onto the outside of the second right side panel 23F and adhered. This completes the formation of the right side panel 23.

[0056] Next, the lid locking piece 3T is folded toward the outside of the main body 20 along the third side panel fold line LT3, which is the upper edge 3E of the third right side panel 53F. The restricting piece 3R is folded along the crease LR from the upper edge of the secondary front panel 21A. Furthermore, the lid right side panel 33F is folded relative to the top lid panel 31 along the lid fold line LT2, and the joining piece 323 is folded relative to the cover panel 32P along the fold line LT. The lid right side panel 33F is then folded over and adhered to the outside of the joining piece 323, thereby forming the lid right side panel 33.

[0057] Next, the wound body 50R, which is the content to be contained, is inserted into the intermediate body having a rectangular cylindrical shape. Then, the first left side panel 14F is folded relative to the back panel 22 along the fold line LT, the second left side panel 24F is folded relative to the front main panel 21B along the fold line LT, and the third left side panel 54F is folded relative to the bottom panel 25 along the fold line LT1. Furthermore, the second left side panel 24F is folded onto the outside of the first left side panel 14F, and the third left side panel 54F is folded onto the outside of the second left side panel 24F and adhered. In this way, the left side panel 24 is formed.

[0058] Next, the lid locking piece 4T is folded toward the outside of the main body 20 along the third side panel fold line LT3, which is the upper edge 4E of the third left side panel 54F. The restricting piece 4R is folded along the crease LR from the upper edge of the secondary front panel 21A. Furthermore, the left lid side panel 34F is folded toward the top lid panel 31 along the lid fold line LT2, and the joining piece 324 is folded toward the cover panel 32P along the fold line LT. The left lid side panel 34F is then folded over and adhered to the outside of the joining piece 324, thereby forming the left lid side panel 34. The rolled body 50R may be inserted from the direction of the right side panel 13F.

[0059] [Folding line connecting the bottom and side panels] 4, the bottom plate 25 and the third right side plate 53F are connected via a fold line LT1 in the width direction DW. The bottom plate 25 and the third left side plate 54F are also connected via a fold line LT1 in the width direction DW.

[0060] In this embodiment, an imaginary straight line 61 is assumed to connect a front end 61F, which is the end of the bottom plate 25 closer to the front plate 21 in the length direction DL, and a rear end 61B, which is the end of the bottom plate 25 closer to the rear plate 22 in the length direction DL. In this case, the fold line LT1 is formed so as to extend from the front end 61F to the rear end 61B, passing closer to the third right side plate 53F than the imaginary straight line 61. The fold line LT1 is also formed so as to extend from the front end 61F to the rear end 61B, passing closer to the third left side plate 54F than the imaginary straight line 61. The fold line LT1 includes a half-slit line 65 in a portion thereof. The half-slit line 65 refers to, for example, a cut made in about halfway through the thickness direction of a sheet of cardboard or other thick paper. The half-slit line 65 may be a perforation line or a combination of a half-slit line and a perforation line. In the fold line LT1, the part other than the half-cut line 65 or the perforation line is a pressed part that was pressed with a blunt-tipped creasing blade, i.e., a pressed crease part. The half-cut line 65 part is a part that is easier to bend than the pressed crease part.

[0061] When the third right side panel 53F and the third left side panel 54F are bent relative to the bottom panel 25 along the fold line LT1, the portion of the bottom panel 25 adjacent to the fold line LT1 becomes a recessed depression 66. This depression 66 also causes the central portion of the bottom panel 25 in the longitudinal direction DL to be recessed. Here, the central portion of the bottom panel 25 in the longitudinal direction DL refers to the portion of the bottom panel 25 not adjacent to the third right side panel 53F and the third left side panel 54F when the length of the bottom panel 25 in the longitudinal direction DL is divided into thirds. The depression 66 is likely to be formed in the portion of the bottom panel 25 adjacent to the fold line LT1 due to the fold line LT1. Meanwhile, although the central portion of the bottom panel 25 is far from the fold line LT1, it is affected by the depressions 66 formed at the left and right ends of the bottom panel 25, reducing outward bulging. It is preferable to form the fold line LT1 in consideration of the effect of reducing the bulging of the entire bottom panel 25. Therefore, the bottom plate 25 can have a smoother bottom surface by suppressing outward bulging, which makes it less likely to collapse when storage boxes containing wound bodies are stacked, improving stackability.

[0062] The fold line LT1 includes a front crease 62, a rear crease 63, and an intermediate crease 64. The front crease 62 is an indented crease that extends obliquely from the front end 61F toward the rear end 61B, and the length of the front crease 62 is in the range of 5% to 45% of the total length of the fold line LT1 from the front end 61F to the rear end 61B. The rear crease 63 is an indented crease that extends obliquely from the rear end 61B toward the front end 61F, and the length of the rear crease 63 is in the range of 5% to 45% of the total length of the fold line LT1 from the front end 61F to the rear end 61B. The intermediate creased portion 64 is located between the front creased portion 62 and the rear creased portion 63, and the length of the intermediate creased portion 64 is in the range of 10% to 90% of the entire length of the fold line LT1 from the front end 61F to the rear end 61B. In the first embodiment, the intermediate creased portion 64 is formed of half-cut lines 65 along its entire length.

[0063] The front creased portion 62, the rear creased portion 63, and the intermediate creased portion 64 each have a linear shape. The fold line LT1 is configured so that the area enclosed by the imaginary line 61 is trapezoidal. Therefore, the intermediate creased portion 64 and the imaginary line 61 are parallel to each other. The front creased portion 62 extends from the front end 61F gradually away from the imaginary line 61 and is connected to the end of the intermediate creased portion 64 on the front panel 21 side. The rear creased portion 63 extends from the rear end 61B gradually away from the imaginary line 61 and is connected to the end of the intermediate creased portion 64 on the rear panel 22 side. The intermediate creased portion 64 is farthest from the imaginary line 61. The interior angle θ1 between the imaginary line 61 and the front creased portion 62 is equal to the interior angle θ2 between the imaginary line 61 and the rear creased portion 63. θ1 and θ2 are 1° to 25°, preferably 2° to 20°, and more preferably 3° to 15°.

[0064] [Front crease length, rear crease length, middle crease length] In this embodiment, the length 64A of the intermediate creased portion 64 is preferably 10% or more of the total length of the crease LT1 from the front end 61F to the back end 61B (the length 62A of the front crease 62, the length 63A of the back crease 63, and the length 64A of the intermediate crease 64). Furthermore, the length of the half-cut line 65 in the intermediate crease 64 is also preferably 10% or more of the total length of the crease LT1 from the front end 61F to the back end 61B. If the length 64A of the intermediate crease 64 is less than 10% of the total length from the front end 61F to the back end 61B, the intermediate crease 64 will be too short. Therefore, distortion will occur when the third right side panel 53F and the third left side panel 54F are folded relative to the bottom panel 25. When the third right side panel 53F and the third left side panel 54F are bent relative to the bottom panel 25, this distortion causes the third right side panel 53F and the third left side panel 54F to break at a position close to the imaginary line 61, resulting in a shallow bend. As a result, the bending positions of the third right side panel 53F and the third left side panel 54F vary. Furthermore, if the length of the half-slit line 65 in the intermediate score line portion 64 is less than 10% of the total length from the front end portion 61F to the rear end portion 61B, the length of the half-slit line 65 becomes shorter, which makes the bending positions of the third right side panel 53F and the third left side panel 54F more likely to vary.

[0065] Furthermore, the length 64A of the intermediate creased portion 64 is preferably 90% or less of the total length of the crease line LT1 from the front end 61F to the rear end 61B. Furthermore, the length of the half-cut line 65 in the intermediate creased portion 64 is preferably 90% or less of the total length of the crease line LT1 from the front end 61F to the rear end 61B. If the length 64A of the intermediate creased portion 64 is greater than 90% of the total length from the front end 61F to the rear end 61B, the intermediate creased portion 64 will be too long. If the intermediate creased portion 64 is too long, the interior angles θ1 and θ2 formed by the imaginary line 61 and the front and rear creased portions 62 and 63 connected to the ends of the intermediate creased portion 64 will be large. This will cause distortion during bending when the side panels are bent relative to the bottom panel, resulting in variations in the bending position of the side panels.

[0066] Furthermore, if the length of the half-cut line 65 in the intermediate line portion 64 is greater than 90% of the total length from the front end portion 61F to the rear end portion 61B, the length of the half-cut line 65 will be so long that when the third right side panel 53F and the third left side panel 54F are bent relative to the bottom plate 25, the cardboard will tear from the intermediate line portion 64, and the required strength will not be obtained in the bent portion.

[0067] Therefore, the length 64A of the intermediate creased portion 64 and the length of the half-cut lines 65 in the intermediate creased portion 64 are preferably in the range of 10% to 90% of the total length from the front end 61F to the back end 61B, more preferably 20 to 70%, and most preferably 30 to 50%. By setting the length in this more preferable range, the paper is easier to fold and has less distortion, which stably improves the bulge of the bottom surface.

[0068] Furthermore, it is preferable that the length 62A of the front creased portion 62 and the length 63A of the rear creased portion 63 are each 5% or more of the total length of the crease line LT1 from the front end 61F to the rear end 61B. If the length 62A of the front creased portion 62 and the length 63A of the rear creased portion 63 are each less than 5% of the total length from the front end 61F to the rear end 61B, the intermediate creased portion 64 will be too long. As a result, the interior angle θ1 between the front creased portion 62 and the imaginary line 61 and the interior angle θ2 between the rear creased portion 63 and the imaginary line 61 will be large, causing distortion when the third right side panel 53F and the third left side panel 54F are bent relative to the bottom panel 25, resulting in variations in the bending positions of the third right side panel 53F and the third left side panel 54F.

[0069] Furthermore, it is preferable that the length 62A of the front crease 62 and the length 63A of the rear crease 63 are each 45% or less of the total length of the crease LT1 from the front end 61F to the rear end 61B. If the length 62A of the front crease 62 and the length 63A of the rear crease 63 are each greater than 45% of the total length from the front end 61F to the rear end 61B, the intermediate crease 64 will be too short. This causes distortion when the third right side panel 53F and the third left side panel 54F are bent relative to the bottom panel 25. When the third right side panel 53F and the third left side panel 54F are bent relative to the bottom panel 25, this distortion causes the third right side panel 53F and the third left side panel 54F to break near the imaginary line 61, resulting in a shallow bend. As a result, the bending positions of the third right side panel 53F and the third left side panel 54F vary.

[0070] Therefore, the length 62A of the front crease 62 and the length 63A of the back crease 63 are each 5% to 45% of the total length from the front end 61F to the back end 61B, more preferably 15 to 40%, and most preferably 25 to 35%. By setting the length in this more preferable range, the entire crease can be easily folded with minimal distortion.

[0071] As described above, the length 64A of the intermediate crease 64 and the length of the half-cut line 65 in the intermediate crease 64 are 10% to 90% of the total length from the front end 61F to the rear end 61B of the fold line LT1, and the length 62A of the front crease 62 and the length 63A of the rear crease 63 are each 5% to 45%. This allows the storage box 10 to bend the third right side panel 53F and the third left side panel 54F relative to the bottom panel 25 while maintaining the necessary strength at the bending positions of the third right side panel 53F and the third left side panel 54F relative to the bottom panel 25 and reducing variation in the bending positions of the third right side panel 53F and the third left side panel 54F. As a result, outward bulging of the bottom panel 25 is suppressed.

[0072] [Ratio of front crease length to rear crease length] The ratio of the length 62A of the front crease 62 to the length 63A of the back crease 63 (length 62A of the front crease 62 / length 63A of the back crease 63) of the crease LT1 is preferably 0.33 or more and 1.00 or less. More preferably, it is 0.50 or more and 1.00 or less. Setting this ratio within this more preferable range reduces distortion of the crease, making it easier to fold stably.

[0073] Furthermore, the ratio of the length 63A of the rear crease 63 to the length 62A of the front crease 62 (length 63A of rear crease 63 / length 62A of front crease 62) of the crease LT1 is preferably 0.33 or more and 1.00 or less. More preferably, it is 0.50 or more and 1.00 or less. By setting this in this more preferable range, distortion of the crease is reduced, making it easier to fold stably.

[0074] When the ratio of the length of the front crease 62 to the length of the rear crease 63 is outside the above-described range, the position of the intermediate crease 64 is too far toward the front panel 21 or the rear panel 22. This makes it difficult to form a recess in the bottom panel 25 adjacent to the fold line LT1, and also in the center of the bottom panel 25 in the length direction DL. As a result, it is difficult to suppress outward bulging of the bottom panel 25, making it difficult to improve stackability. By setting the ratio of the length of the front crease 62 to the length of the rear crease 63 within the above-described range, the bottom panel 25 is recessed in the portion adjacent to the fold line LT1, and this recess also causes the center of the bottom panel 25 in the length direction DL to be recessed. In other words, the crease LT1 forms a recess 66 in the portion of the bottom panel 25 adjacent to the fold line LT1, and this recess 66 can expand toward the center of the bottom panel 25 in the length direction DL. This prevents the bottom plate 25 from bulging outward, improving stackability.

[0075] [Position of intermediate crease relative to virtual line] The length of perpendicular line 68 extending from fold line LT1 (intermediate crease 64) farthest from imaginary straight line 61 to imaginary straight line 61 is preferably 0.5 mm or more. If the length of perpendicular line 68 extending from the position of intermediate crease 64 to imaginary straight line 61 is shorter than 0.5 mm, imaginary straight line 61 and intermediate crease 64 will be too close, making it impossible to recess the portion of bottom plate 25 adjacent to crease line LT1.

[0076] Furthermore, the length of the perpendicular line 68 extending from the fold line LT1 (intermediate crease 64) farthest from the imaginary line 61 to the imaginary line 61 is preferably 5.0 mm or less. If the length of the perpendicular line 68 extending from the intermediate crease 64 to the imaginary line 61 is longer than 5.0 mm, the recess in the portion of the bottom plate 25 adjacent to the fold line LT1 will be too large. As a result, the third right side plate 53F and the third left side plate 54F will not be able to bend securely along the fold line LT1 relative to the bottom plate 25.

[0077] As described above, the length of perpendicular line 68 extending from the position of intermediate crease 64 farthest from imaginary line 61 to imaginary line 61 is set to 0.5 mm or more and 5.0 mm or less. This allows a recess 66, which is a depression of the necessary size, to be formed in the portion of bottom plate 25 adjacent to fold crease LT1. The length of perpendicular line 68 is more preferably 0.7 mm or more and 2.0 mm or less. Setting the length within this more preferable range reduces distortion and results in a stable, easy-to-fold crease.

[0078] [Operation of the first embodiment] As described above, when assembling the storage box 10, the intermediate body of the storage box 10 is formed into a rectangular tubular shape. Then, the right side panel 23 is formed, and the rolled body 50R is inserted into the storage box 10 when the left side panel 24 is open before being formed. When the left side panel 24 is open, the third left side panel 54F also opens downwardly from the bottom panel 25 along the fold line LT1. The fold line LT1 serves as an axis for folding the third left side panel 54F. When the left side panel 24 is open, the third left side panel 54F opens downwardly from the bottom panel 25, so the axis (fold line LT1) tends to bulge toward the inside of the storage box 10. In this regard, because the fold line LT1 is formed through the third left side panel 54F, when the third left side panel 54F is opened downwardly from the bottom panel 25, the axis (fold line LT1) can be prevented from bulging toward the inside of the storage box 10. As a result, the wound body 50R can be smoothly inserted from the opening on the left side panel 24 side.

[0079] As shown in FIG. 5 , the storage box 10 has a fold line LT1 formed through the third right side panel 53F and the third left side panel 54F. Therefore, the third right side panel 53F and the third left side panel 54F are folded along the fold line LT1 relative to the bottom panel 25. At corners 67 formed by the bottom panel 25 and the third right side panel 53F and the third left side panel 54F, the bottom panel 25 is recessed inward by the folding at the front crease 62, the rear crease 63, and the middle crease 64, forming recesses 66. The recesses 66 extend from the corners 67 toward the center of the bottom panel 25 in the length direction DL. Each recess 66 formed on both sides of the bottom panel 25 in the length direction DL extends toward the center of the bottom panel 25 in the length direction DL. Therefore, the bottom panel 25 is prevented from bulging outward overall, resulting in a smoother bottom surface.

[0080] As shown in Figure 6, when storage boxes 10 are displayed as products in a store, they may be stacked upward on a placement surface 69 such as a shelf. In this case, of storage boxes 10 lined up one above the other, the bottom plate 25 of the upper storage box 10 is configured with a smooth bottom surface. Therefore, the storage boxes 10 can be stacked upward stably. For example, even if the storage boxes 10 are stacked about five levels high, the stacked state can be stabilized.

[0081] [Effects of the first embodiment] According to the first embodiment, the following effects can be obtained. (1-1) The storage box 10 is formed so that the fold line LT1 extends from the front end 61F through the third right side panel 53F and the third left side panel 54F closer to the imaginary line 61 to the rear end 61B. Therefore, the portion of the bottom plate 25 formed by folding along the fold line LT1 adjacent to the fold line LT1 forms a recess 66, and the central portion of the bottom plate 25 in the longitudinal direction DL can also be recessed due to this recess 66. Therefore, the bottom plate 25 can have a smoother bottom surface by suppressing outward bulging. This makes the storage boxes 10 less likely to collapse when stacked, improving stackability. In other words, the storage boxes 10 as products can be stacked without collapsing.

[0082] (1-2) The intermediate crease portion 64, which is part of the fold line LT1, is configured with a half-cut line 65. This makes it easier to bend the third right side panel 53F and the third left side panel 54F relative to the bottom panel 25. As a result, it is possible to reduce variation in the bending positions of the third right side panel 53F and the third left side panel 54F relative to the bottom panel 25. As a result, it is possible to reduce outward bulging of the bottom panel 25.

[0083] (1-3) The middle creased portion 64 is located at the farthest position from the imaginary line 61, so it is less likely to bend due to distortion. For this reason, the middle creased portion 64 is provided with a half-cut line 65, making it easier to bend. Therefore, the third right side panel 53F and the third left side panel 54F can be bent in a stable position without variations in the bending position of the side panels.

[0084] (1-4) The fold line LT1 has a length 64A of the intermediate crease 64 that is 10% to 90% of the total length from the front end 61F to the rear end 61B. The fold line LT1 also has a length 65 of the half-cut line 65 of the intermediate crease 64 that is 10% to 90% of the total length from the front end 61F to the rear end 61B. The lengths 62A and 63A of the front crease 62 and the rear crease 63 are each 5% to 45%. This allows the storage box 10 to obtain the necessary strength at the bending portions of the third right side panel 53F and the third left side panel 54F relative to the bottom panel 25. The storage box 10 can also bend the third right side panel 53F and the third left side panel 54F relative to the bottom panel 25 while minimizing variation in the bending positions of the third right side panel 53F and the third left side panel 54F. As a result, the bottom plate 25 can be prevented from bulging outward.

[0085] (1-5) In the storage box 10, the ratio of the length 62A of the front creased portion 62 to the length 63A of the rear creased portion 63 or the ratio of the length 63A of the rear creased portion 63 to the length 62A of the front creased portion 62 is set to 0.33 or more and 1.00 or less. As a result, a recess 66 is formed in the portion of the bottom plate 25 adjacent to the fold line LT1, and the center portion of the bottom plate 25 in the longitudinal direction can also be formed to be recessed due to this recess 66. As a result, the bottom plate 25 is prevented from bulging outward, improving stackability.

[0086] (1-6) The fold line LT1 has a straight line shape at the front crease 62, the back crease 63, and the middle crease 64. Therefore, the straight line shape of the fold line LT1 allows the third right side panel 53F and the third left side panel 54F to be bent relative to the bottom panel 25 while forming a recess 66.

[0087] (1-7) The length of the perpendicular line extending from the intermediate crease 64, which is the farthest from the imaginary line 61, to the imaginary line 61 is set to be 0.5 mm or more and 5.0 mm or less. Therefore, a recess 66 of a necessary size can be formed in the portion of the bottom plate 25 adjacent to the crease LT1, thereby preventing the bottom plate 25 from bulging outward.

[0088] [Modification of the first embodiment] The first embodiment can be modified as follows: The first embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

[0089] The fold line LT1 may be formed on either the bottom plate 25 and the third right side plate 53F, or the bottom plate 25 and the third left side plate 54F. The position of the intermediate creased portion 64 farthest from the imaginary line 61 may be more than 5.0 mm. For example, a small portion of the intermediate creased portion 64 may be more than 5.0 mm away. Furthermore, the position of the intermediate creased portion 64 farthest from the imaginary line 61 may be more than 0.5 mm away. For example, a small portion of the intermediate creased portion 64 may be more than 0.5 mm away.

[0090] The fold crease LT1 is made up of a front crease 62, a back crease 63, and an intermediate crease 64, but these creases are not limited to being straight. For example, each of these creases may be made up of a curved shape or a combination of a straight shape and a curved shape.

[0091] Alternatively, the front creased portion 62 and the back creased portion 63 may each be linear, and the intermediate creased portion 64 may be curved and bulge upward or downward. Conversely, the front creased portion 62 and the back creased portion 63 may each be curved and bulge upward or downward, and the intermediate creased portion 64 may be linear.

[0092] The lengths 62A of the front and rear score lines 62 and 63 may be different as long as the ratio of the length 62A of the front score line 62 to the length 63A of the rear score line 63 or the ratio of the length 63A of the rear score line 63 to the length 62A of the front score line 62 is within the range of 0.33 to 1.00. In other words, the intermediate score line 64 may be biased toward either the front panel 21 or the rear panel 22 so as to fall within this range.

[0093] The fold line LT1 is made up of a front crease 62, a rear crease 63, and an intermediate crease 64, but the entire intermediate crease 64 does not have to be made up of half-cut lines 65. Part of the intermediate crease 64 may be half-cut lines 65.

[0094] The half-cut lines 65 may be perforated lines. Alternatively, the half-cut lines 65 may be a combination of perforated lines and half-cut lines 65. For example, the intermediate ruled portion 64 may include a half-cut line 65 portion and a perforated line portion.

[0095] [Second embodiment] 7, in the second embodiment, the lid fold line LT2 connecting the top cover plate 31 and the right cover side plate 33F is formed so as to extend from the front cover end 71F to the rear cover end 71B, passing closer to the right cover side plate 33F than the imaginary line 71. The lid fold line LT2 connecting the top cover plate 31 and the left cover side plate 34F is also formed so as to extend from the front cover end 71F to the rear cover end 71B, passing closer to the left cover side plate 34F than the imaginary line 71.

[0096] Specifically, an imaginary straight line 71 is assumed to connect a front lid end 71F, which is the end of the top lid plate 31 on the front lid plate 32 side in the length direction DL, to a rear lid end 71B, which is the end of the top lid plate 31 on the rear plate 22 side in the length direction DL. In this case, the lid folding line LT2 is formed so as to extend from the front lid end 71F, passing through the right lid side plate 33F and the left lid side plate 34F side of the imaginary straight line 71, to the rear lid end 71B. The lid folding line LT2 has a half-slit line 75 in a part thereof. The half-slit line 75 may be a perforation line or a combination of a half-slit line and a perforation line.

[0097] When the right lid side panel 33F and the left lid side panel 34F are bent relative to the top cover plate 31 along the lid fold line LT2, the portion of the top cover plate 31 adjacent to the lid fold line LT2 is recessed, forming a recess 76. This recess 76 also causes the center portion of the top cover plate 31 in the longitudinal direction DL to be recessed. The center portion of the top cover plate 31 in the longitudinal direction DL is the portion of the top cover plate 31 not adjacent to the right lid side panel 33F and the left lid side panel 34F when the length of the top cover plate 31 in the longitudinal direction DL is divided into thirds. Therefore, the top cover plate 31 can have a smoother top surface by suppressing outward bulging. This makes it less likely for the storage boxes 10 to collapse when stacked, improving stackability.

[0098] The lid fold crease LT2 includes a front crease 72, a rear crease 73, and an intermediate crease 74. The front crease 72 is a pressed crease that extends diagonally from the front lid end 71F toward the rear lid end 71B. The rear crease 73 is a pressed crease that extends diagonally from the rear lid end 71B toward the front lid end 71F. The intermediate crease 74 is located between the front crease 72 and the rear crease 73. In the second embodiment, the intermediate crease 74 is formed by a half-slit line 75 along its entire length. The half-slit line 75 is more easily bent than the pressed crease other than the half-slit line 75.

[0099] The front creased portion 72, the rear creased portion 73, and the intermediate creased portion 74 each have a linear shape. The lid fold crease LT2 is configured so that the area enclosed by the imaginary line 71 is trapezoidal. Therefore, the intermediate creased portion 74 and the imaginary line 71 are parallel to each other. The front creased portion 72 extends from the front lid end 71F so as to gradually move away from the imaginary line 71 and is connected to the end of the intermediate creased portion 74 on the front lid plate 32 side. The rear creased portion 73 extends from the rear lid end 71B so as to gradually move away from the imaginary line 71 and is connected to the end of the intermediate creased portion 74 on the rear plate 22 side. The intermediate creased portion 74 is farthest from the imaginary line 71. The interior angle θ1 between the imaginary line 71 and the front creased portion 72 is equal to the interior angle θ2 between the imaginary line 71 and the rear creased portion 73. θ1 and θ2 are 1° to 25°, preferably 2° to 20°, and more preferably 3° to 15°.

[0100] [Operation of the second embodiment] As shown in FIG. 8 , the storage box 10 has a lid fold line LT2 formed through the right lid side panel 33F and the left lid side panel 34F. Therefore, the right lid side panel 33F and the left lid side panel 34F are folded along the lid fold line LT2 relative to the top lid panel 31. At a corner 77 formed by the top lid panel 31 and the right lid side panel 33F or the left lid side panel 34F, the portion of the top lid panel 31 adjacent to the lid fold line LT2 is recessed inward by folding along the front crease 72, the rear crease 73, and the middle crease 74, forming a recess 76. The recess 76 extends from the corner 77 toward the center of the top lid panel 31 in the length direction DL. Each recess 76 formed on both sides of the top lid panel 31 in the length direction DL extends toward the center of the top lid panel 31 in the length direction DL. Therefore, the upper cover plate 31 is prevented from bulging outward as a whole, and a smoother upper surface (lid surface) can be formed.

[0101] When the storage boxes 10 are displayed as products in stores, they are sometimes stacked one on top of the other. In this case, of the storage boxes 10 lined up one above the other, the top cover plate 31 of the lower storage box 10 has a smooth upper surface. Therefore, the storage boxes 10 can be stably stacked one on top of the other.

[0102] [Effects of the second embodiment] According to the second embodiment, the following effects can be obtained. (2-1) The storage box 10 is formed so that the lid fold line LT2 extends from the front lid end 71F through the right lid side panel 33F and the left lid side panel 34F beyond the imaginary line 71 to the rear lid end 71B. Therefore, the portion of the top lid plate 31 formed by folding along the lid fold line LT2 adjacent to the lid fold line LT2 forms a recess 76, and the central portion of the top lid plate 31 in the longitudinal direction DL can also be recessed due to this recess 76. Therefore, the top lid plate 31 can have a smoother top surface by suppressing outward bulging. This makes the storage boxes less likely to collapse when stacked, improving stackability. In other words, the storage boxes 10 as products can be stacked without collapsing.

[0103] [Modification of the second embodiment] The second embodiment can be modified as follows: The second embodiment and the following modifications can be combined with each other to the extent that they are not technically inconsistent. They can also be combined with the first embodiment to the extent that they are not technically inconsistent.

[0104] The second embodiment may combine the configuration of the fold line LT1 passing through the third right side panel 53F and the third left side panel 54F in the first embodiment. This suppresses the outward bulging of the bottom panel 25, allowing the bottom panel 25 to have a smoother bottom surface. In addition, suppressing the outward bulging of the top cover panel 31 allows the top cover panel 31 to have a smoother top surface. In other words, the improved smoothness of the bottom and top surfaces of the storage box 10 makes it easier for the storage boxes 10 to be stacked as products without collapsing.

[0105] The lid folding line LT2 may be formed on either the top lid plate 31 and the right lid side plate 33F, or the top lid plate 31 and the left lid side plate 34F. In the second embodiment, as in the first embodiment, the length 74A of the intermediate score 74 of the lid fold line LT2 may be in the range of 10% to 90% of the total length from the front lid end 71F to the rear lid end 71B. The length of the half-cut line 75 in the intermediate score 74 may also be in the range of 10% to 90% of the total length of the lid fold line LT2 from the front lid end 71F to the rear lid end 71B. Additionally, the length 72A of the front score 72 and the length 73A of the rear score 73 of the lid fold line LT2 may each be in the range of 5% to 45%. This makes it possible to obtain the necessary strength at the bending portions of the right lid side plate 33F and the left lid side plate 34F relative to the top cover plate 31, while suppressing variations in the bending positions of the right lid side plate 33F and the left lid side plate 34F, and to bend the right lid side plate 33F and the left lid side plate 34F relative to the top cover plate 31. As a result, it is possible to suppress outward bulging of the top cover plate 31.

[0106] In the second embodiment, as in the first embodiment, the ratio of the length 72A of the front creased portion 72 to the length 73A of the rear creased portion 73 or the ratio of the length 73A of the rear creased portion 73 to the length 72A of the front creased portion 72 may be 0.33 or more and 1.00 or less. This allows a recess 76 to be formed in the top cover plate 31 in a portion adjacent to the lid fold line LT2, and the central portion of the top cover plate 31 in the longitudinal direction DL can also be formed to be recessed due to this recess 76. As a result, the top cover plate 31 is prevented from bulging outward, improving stackability.

[0107] The lengths 72A of the front and rear score lines 72 and 73 may be different as long as the ratio of the length 72A of the front score line 72 to the length 73A of the rear score line 73 or the ratio of the length 73A of the rear score line 73 to the length 72A of the front score line 72 is within the range of 0.33 to 1.00. In other words, the intermediate score line 74 may be biased toward either the front cover plate 32 or the rear plate 22 so as to fall within this range.

[0108] In the second embodiment, as in the first embodiment, the length of the perpendicular line 78 extending from the position of the intermediate crease 74 farthest from the imaginary line 71 to the imaginary line 71 may be set to 0.5 mm or more and 5.0 mm or less. This allows a recess 76 of a necessary size to be formed in the part of the top cover plate 31 adjacent to the lid fold line LT2, thereby preventing the top cover plate 31 from bulging outward.

[0109] The position of the intermediate creased portion 74 farthest from the imaginary line 71 may be more than 5.0 mm. For example, a small portion of the intermediate creased portion 74 may be more than 5.0 mm away. Furthermore, the position of the intermediate creased portion 74 farthest from the imaginary line 71 may be more than 0.5 mm away. For example, a small portion of the intermediate creased portion 74 may be more than 0.5 mm away.

[0110] The flap fold crease LT2 is made up of a front crease 72, a back crease 73, and an intermediate crease 74, but these creases are not limited to straight creases. For example, each of these creases may be made up of a curved shape, a straight shape, or a shape that is a combination of curved shapes.

[0111] Alternatively, the front and back ruled portions 72 and 73 may each be linear, and the intermediate ruled portion 74 may be curved and bulge upward or downward. Conversely, the front and back ruled portions 72 and 73 may each be curved and bulge upward or downward, and the intermediate ruled portion 74 may be linear. [Explanation of symbols]

[0112] LT...fold line LT1...crease LT2...lid fold line 10...Storage box 13F...1st right side panel 14F...1st left side panel 20...Main body 20T…Aperture 21...Front panel 21A... Sub-front panel 21B…Main front plate 22...Rear plate 23F...Second right side panel 24F…2nd left side board 25…Bottom plate 30…Lid part 31...Top cover plate 32...Front cover plate 32P…cover plate 33...Right side panel of the lid 33F...Right side panel of the lid 34... Left side panel of lid 34F... Left side panel of the lid 35…Cutting blade 50...wrap film 53F…3rd right side panel 54F…3rd left side board 61...imaginary line 61B...Rear end 61F...Front end 62...Front ruled line area 62A...length 63...Rear crease 63A...Length 64...Intermediate crease section 64A...length 65...Half-cut line 66...recess 67...Corner 68...Perpendicular

Claims

1. A storage box having a bottom plate, a front plate, a rear plate, and a pair of side plates on the left and right, A fold line is provided connecting the bottom plate and the side plate, The direction from one side board to the other side board is the length direction, The fold lines are When a virtual line connecting a front end portion of the bottom plate, which is an end portion of the bottom plate on the front plate side in the longitudinal direction, and a rear end portion of the bottom plate, which is an end portion of the bottom plate on the rear plate side in the longitudinal direction, is assumed, At least one of the fold lines is formed so as to extend from the front end portion to the rear end portion through the side panel side of the imaginary straight line. Storage box.

2. At least a portion of the fold line includes any one of a half-cut line, a perforation line, and a combination of the half-cut line and the perforation line. The storage box according to claim 1.

3. The fold lines are a front crease extending from the front end toward the rear end; a rear crease extending from the rear end toward the front end; an intermediate crease portion located between the front crease portion and the rear crease portion, At least a part of the intermediate ruled line portion is provided with any one of the half-cut line, the perforation line, or a combination of the half-cut line and the perforation line. The storage box according to claim 2.

4. With respect to the entire length from the front end to the rear end in the fold line, the length of the intermediate crease is 10% or more and 90% or less; The length of any one of the half-cut line, the perforation line, and the combination of the half-cut line and the perforation line in the intermediate crease portion is 10% or more and 90% or less of the total length of the crease line from the front end to the rear end, The length of each of the front and rear creases is 5% or more and 45% or less. The storage box according to claim 3.

5. the ratio of the length of the front crease to the length of the rear crease (length of the front crease / length of the rear crease); and The ratio of the length of the rear crease to the length of the front crease (the length of the rear crease / the length of the front crease) The ratio of either of these is 0.33 or more and 1.00 or less The storage box according to claim 3 or 4.

6. The folding lines are configured in any one of a straight line shape, a curved line shape, and a combination of a straight line shape and a curved line shape. The storage box according to any one of claims 1 to 3.

7. The length of the perpendicular line extending from the position of the fold line farthest from the imaginary line to the imaginary line is 0.5 mm or more and 5.0 mm or less. The storage box according to any one of claims 1 to 3.

8. A storage box comprising a bottom plate, a front plate, a rear plate, and a pair of side plates on the left and right, a main body defining an opening on the top surface for putting in and taking out stored items, and a lid for opening and closing the opening, The lid portion includes an upper lid plate connected to the rear plate and closing the opening, a front lid plate connected to the upper lid plate and overlapping the outside of the front plate when the upper lid plate closes the opening, a pair of left and right lid side plates overlapping the outside of the side plates when the upper lid plate closes the opening, and a lid folding line connecting the upper lid plate and the lid side plates, The direction from one side board to the other side board is the length direction, When the lid folding line is assumed to be a virtual straight line connecting a front lid end portion, which is an end portion of the top lid plate on the front lid plate side in the length direction, and a rear lid end portion, which is an end portion of the top lid plate on the rear plate side in the length direction, At least one of the lid folding lines is formed so as to extend from the front lid end portion to the rear lid end portion through the lid side panel side of the imaginary straight line. Storage box.

Images