Packaging box

Abstract

To provide a packaging box capable of improving formability during box manufacturing.SOLUTION: A storage box 1 includes a trunk part 2, an upper surface sealing part 3, and a lower surface sealing part 4. The trunk part 2 has a left side plate 5, a front side plate 6, a right side plate 7 and a rear side plate 8. When a force is applied to an upper surface front inner flap 3a of the upper surface sealing part 3 in a direction of folding along a crease line L5, left and right side edges of the upper surface front inner flap 3a abut against an upper surface left outer flap 3c and an upper surface right outer flap 3d, and are folded outward along lead lines L18 and L20. This allows the upper surface front inner flap 3a to be easily folded along the upper surface front inner flap 3a simply by applying a small force in a direction of folding the upper surface front inner flap 3a. When the upper surface front inner flap 3a is folded along the crease line L5, the left and right side edges of the upper surface front inner flap 3a are inserted into the front recesses 5a and 7a, respectively, so that the upper surface left outer flap 3c and the upper surface right outer flap 3d can be easily folded.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a packaging box constructed by assembling corrugated cardboard or the like. [Background technology]

[0002] Currently, low-profile A-type cardboard boxes are sometimes used as packaging boxes for home delivery and online shopping. However, such A-type boxes cannot be manufactured in an integrated process of printing, cutting, and gluing, and generally require many steps, which leads to increased costs. A method for manufacturing low-profile A-type boxes in an integrated process is known to be to insert a slit without a groove between the inner and outer flaps on the top or bottom side.

[0003] For example, the box sheet described in Patent Document 1 has a pair of first slits extending from both ends of a joint between a pair of upper inner flaps and a first and third side panel toward the inside in the left-right direction of the joint, and a second slit extending from the tip of each pair of first slits toward the inside in the left-right direction of the joint and toward the tip side of the extension direction of the pair of upper inner flaps. The first slits are connected to a slit between the flaps that does not have a groove.

[0004] The base end X defined by the side edge of the upper inner flap and the first and second slits is held in a pressed-in state within the lower portion of the first slit in the first side panel.

[0005] When the pair of upper outer flaps are folded inward and their tips are butted against each other, both ends of the pair of upper outer flaps in the width direction are slightly recessed downward, which stabilizes the holding state of the pair of upper inner flaps by the pair of upper outer flaps (see Patent Document 1). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Utility model registration No. 3207852 Summary of the Invention [Problem to be solved by the invention]

[0007] However, the packaging box in Patent Document 1 has no grooves between the flaps (see Figure 2), which means that the inner and outer flaps interfere with each other when sealing, making it difficult to close the lid and resulting in poor formability when making the box.

[0008] In addition, when the inner flap is folded, the side surface of the inner flap abuts against the inner surface of the side plate to which the outer flap is connected, and the side plate is pushed outward, and the outer flap is also positioned outward from the reference position. This makes it difficult to fold the outer flap, and there is a problem that the formability during box making is poor. Furthermore, when the outer flap is folded, a gap is generated between the tips of the two opposing outer flaps, which impairs the aesthetic appearance.

[0009] The present invention has been made in consideration of the above circumstances, and has an object to provide a packaging box that can improve formability during box manufacturing. [Means for solving the problem]

[0010] In order to achieve the above object, the present invention provides a packaging box including a rectangular tubular body, an upper sealing part connected to an upper end side of the body and sealing an upper end opening of the body, and a lower sealing part connected to a lower end side of the body and sealing a lower end opening of the body, the body portion has a first side plate and a second side plate facing each other in a first direction, and a third side plate and a fourth side plate facing each other in a second direction intersecting the first direction, the first side plate being connected to the third side plate and the fourth side plate, and the second side plate being connected to the fourth side plate; the top sealing portion includes a first inner flap connected to the first side plate, a second inner flap connected to the second side plate, a first outer flap connected to the third side plate and covering the first inner flap and the second inner flap, and a second outer flap connected to the fourth side plate and covering the first inner flap and the second inner flap, The first inner flap is formed with a first lead line extending downward from an upper end of an end portion on the boundary line side with the first outer flap, a first score line extending from a lower end of the first lead line to the boundary line with the first outer flap, a second lead line extending downward from an upper end of an end portion on the boundary line side with the second outer flap, and a second score line extending from a lower end of the second lead line to the boundary line with the second outer flap, The second inner flap is characterized in that it has a third lead line extending downward from the upper end of the end portion on the boundary line side with the second outer flap, and a third score line extending from the lower end of the third lead line to the boundary line with the second outer flap.

[0011] In addition, the upper end, lower end and downward direction of the first inner flap and the second inner flap refer to the upper end, lower end and downward direction of each inner flap when they are erected in the vertical direction before being folded.

[0012] When the inner and outer flaps are connected via separation lines (slits), when a rectangular tubular body is formed during box making and before the inner and outer flaps are folded, both side edges of the first inner flap overlap the first and second outer flaps. Therefore, when force is applied in the direction to fold the first inner flap, the both side edges of the first inner flap abut against the first and second outer flaps.

[0013] In the present invention, the first inner flap has a first lead crease, a first score line, a second lead crease, and a second score line formed therein, so that when a force is applied in a direction to fold the first inner flap, both side edges of the first inner flap abut against the first outer flap and the second outer flap and are folded outward along the first lead crease and the second lead crease. This makes it possible to easily fold the first inner flap by simply applying a small force in the direction to fold the first inner flap, improving formability during box making.

[0014] As with the first inner flap, when force is applied in a folding direction to the second inner flap, the side edge of the second inner flap abuts against the second outer flap and is folded outward along the third lead line. This allows the second inner flap to be easily folded by simply applying a small force in the folding direction, improving formability during box making.

[0015] It is preferable that the second inner flap is formed with a fourth lead line extending downward from the upper end of the end opposite the boundary line with the second outer flap, and a fourth score line extending from the lower end of the fourth lead line to the side edge opposite the boundary line with the second outer flap.

[0016] According to this configuration, when a force is applied in a direction to fold the second inner flap, the side edge of the second inner flap abuts against the first outer flap and is folded outward along the fourth lead line. This makes it possible to easily fold the second inner flap by simply applying a small force in the direction to fold the second inner flap, improving formability during box making.

[0017] The present invention relates to a packaging box including a rectangular tubular body, an upper sealing portion connected to an upper end side of the body to seal an upper end opening of the body, and a lower sealing portion connected to a lower end side of the body to seal a lower end opening of the body, the body portion has a first side plate and a second side plate facing each other in a first direction, and a third side plate and a fourth side plate facing each other in a second direction intersecting the first direction, the first side plate being connected to the third side plate and the fourth side plate, and the second side plate being connected to the fourth side plate; the top sealing portion includes a first inner flap connected to the first side plate, a second inner flap connected to the second side plate, a first outer flap connected to the third side plate and covering the first inner flap and the second inner flap, and a second outer flap connected to the fourth side plate and covering the first inner flap and the second inner flap, a first recess is formed at an upper end of the third side panel, into which a side edge of the first inner flap on a boundary line side with the first outer flap is inserted when the first inner flap is folded at the boundary line with the first side panel; a second recess into which a side edge portion of the first inner flap on the side of the boundary line with the second outer flap is inserted when the first inner flap is folded along the boundary line with the first side panel, and a third recess into which a side edge portion of the second inner flap on the side of the boundary line with the second outer flap is inserted when the second inner flap is folded along the boundary line with the second side panel.

[0018] According to the present invention, when the first and second inner flaps are folded, the side edges of the first and second inner flaps are inserted into the first to third recesses, and the third and fourth side panels are not pushed outward. This makes it easier to fold the outer flaps and improves formability during box making, compared to conventional boxes that do not have the first to third recesses and in which the third and fourth side panels are pushed outward. Furthermore, when the first and second outer flaps are folded, the occurrence of a gap between the tip of the first outer flap and the tip of the second outer flap is suppressed, and thus the aesthetic appearance is prevented from being impaired.

[0019] It is preferable that a fourth recess is formed at the upper end of the third side panel, at a position opposite to the side edge of the second inner flap opposite the boundary line with the second outer flap, into which the side edge of the second inner flap opposite the boundary line with the second outer flap can be inserted when the second inner flap is folded at the boundary line with the second side panel.

[0020] According to this configuration, when the second inner flap is folded, the side edge of the second inner flap is inserted into the fourth recess, and the third side plate is not pushed outward. This makes it easier to fold the outer flaps compared to a conventional box that does not have a fourth recess and in which the third side plate is pushed outward, improving formability during box making. Furthermore, when the first outer flap and the second outer flap are folded, the occurrence of a gap between the tip of the first outer flap and the tip of the second outer flap is suppressed, thereby suppressing damage to the aesthetic appearance.

[0021] The first inner flap and the first outer flap are connected via a first connecting line having a separation line and a connected portion, It is preferable that the second inner flap and the second outer flap are connected via a second connecting line having a separation line and a connected portion.

[0022] In a low-height packaging box in which the first to fourth side panels are low in height, when the box is bent along the boundary line between the first to fourth side panels, the boundary line may break.

[0023] In the present invention, a connecting line is formed continuous with the boundary line, so that the rigidity is stronger when bent and breakage is suppressed compared to a case in which a slit is formed instead of the connecting line. [Brief description of the drawings]

[0024] [Figure 1] FIG. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] 1 is a perspective view showing the state in which the folding of the top front inner flap and the top rear inner flap of the packaging box has begun. [Diagram 5] 13 is an end view showing the state in which the upper front inner flap is folded and the side edge of the upper front inner flap is inserted into the front recess of the left side panel. FIG. [Figure 6] 13 is an end view showing the state in which the upper surface rear inner flap is folded and the side edge of the upper surface rear inner flap is inserted into the rear recess of the left side plate. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Hereinafter, a packaging box according to an embodiment of the present invention will be described with reference to the drawings.

[0026] As shown in FIG. 1, the packaging box 1 is formed in a rectangular box shape and includes a rectangular tubular body 2, and an upper surface sealing portion 3 and a lower surface sealing portion 4 that face each other.

[0027] The torso 2 has four side panels, namely a left side panel 5 (third side panel), a front side panel 6 (first side panel), a right side panel 7 (fourth side panel), and a rear side panel 8 (second side panel), with the left side panel 5 and the right side panel 7 facing each other as a left-right pair, and the front side panel 6 and the rear side panel 8 facing each other, forming a rectangular cylindrical shape.

[0028] As shown in FIG. 2, the packaging box 1 is assembled from a corrugated paperboard 10 that has been punched into a roughly rectangular shape.

[0029] As shown unfolded in Figure 2, the corrugated cardboard 10 has a rectangular left side plate 5 extending in the left-right and front-rear directions, and a rectangular front plate 6 is connected to the front edge (right edge in Figure 2) of the left side plate 5 via a fold line L1, and an adhesive piece 11 (stopping edge) is connected to the rear edge (left edge in Figure 2) of the left side plate 5 via a fold line L2.

[0030] A rectangular right side plate 7 is connected to the right edge (right edge in Figure 2) of the front side plate 6 via a fold line L3, and a rectangular rear side plate 8 is connected to the rear edge (right edge in Figure 2) of the right side plate 7 via a fold line L4.

[0031] The top sealing portion 3 is composed of a pair of opposing top front inner flap 3a (first inner flap) and top rear inner flap 3b (second inner flap), and a pair of opposing top left outer flap 3c (first outer flap) and top right outer flap 3d (second outer flap), and seals the top end opening of the body portion 2.

[0032] The upper front inner flap 3a is connected to the upper edge of the front panel 6 via a fold line L5, and the upper rear inner flap 3b is connected to the upper edge of the rear panel 8 via a fold line L6.

[0033] The upper left outer flap 3c is connected to the upper edge of the left side plate 5 via a fold line L7, and the upper right outer flap 3d is connected to the upper edge of the right side plate 7 via a fold line L8.

[0034] The front edge (the right edge in FIG. 2) of the upper left outer flap 3c is connected to the upper front inner flap 3a via a connecting line L9. The connecting line L9 is composed of a line having a separation line (a cut) and a connected portion.

[0035] The right edge of the upper front inner flap 3a (the right edge in FIG. 2) is connected to the upper right outer flap 3d via a connecting line L10. The connecting line L10 is composed of a line having a separation line (a cut) and a connected portion.

[0036] The rear edge (the right edge in FIG. 2) of the upper surface right outer flap 3d is connected to the upper surface rear inner flap 3b via a connecting line L11. The connecting line L11 is composed of a line having a separation line (a cut) and a connected portion.

[0037] In this embodiment, the pair of upper left outer flap 3c and upper right outer flap 3d are butted together at their tips and sealed with duct tape (not shown). This duct tape is affixed from the front panel 6 through the upper left outer flap 3c and upper right outer flap 3d to the rear panel 8.

[0038] The bottom sealing portion 4 is composed of a pair of bottom inner flaps 4a, 4b facing each other and a pair of bottom outer flaps 4c, 4d facing each other, and seals the bottom opening of the body portion 2.

[0039] The lower inner flap 4a is connected to the lower edge of the front panel 6 via a fold line L12, and the lower inner flap 4b is connected to the lower edge of the rear panel 8 via a fold line L13.

[0040] The lower outer flap 4c is connected to the lower edge of the left side panel 5 via a fold line L14, and the lower outer flap 4d is connected to the lower edge of the right side panel 7 via a fold line L15.

[0041] The adhesive piece 11 is formed with a first adhesive portion 11a and a second adhesive portion 11b, and a fold line L16 is formed at the boundary between them. The first adhesive portion 11a is connected to the rear edge (left edge in FIG. 2) of the left side plate 5 via the fold line L2, and the second adhesive portion 11b is connected to the upper end edge of the first adhesive portion 11a via the fold line L16. The second adhesive portion 11b is formed with a gap between it and the rear edge (left edge in FIG. 2) of the upper left outer flap 3c.

[0042] The first adhesive portion 11a is adhered to the rear side plate 8, and the second adhesive portion 11b is adhered to the upper surface rear inner flap 3b.

[0043] The left side plate 5 has a front recess 5a and a rear recess 5b that are concavely pressed from the inner surface to the outer surface in the thickness direction. The front recess 5a is formed in a rectangular shape at the upper end of the left side plate 5, extending from the fold line L1 to the rear side (left side in FIG. 2). The rear recess 5b is formed in a rectangular shape at the upper end of the left side plate 5, extending from the fold line L2 to the front side (right side in FIG. 2).

[0044] The height of the front recess 5a and the rear recess 5b (the length in the vertical direction in FIG. 2) is, for example, 1.5 times or more the thickness of the corrugated paperboard 10. There is a gap between the front recess 5a and the rear recess 5b, and this gap is not crushed into a concave shape.

[0045] The right side plate 7 has a front recess 7a and a rear recess 7b similar to the front recess 5a and the rear recess 5b. The front recess 7a is formed in a rectangular shape at the upper end of the left side plate 5, extending from the fold line L3 to the rear side (the right side in FIG. 2). The rear recess 7b is formed in a rectangular shape at the upper end of the left side plate 5, extending from the fold line L4 to the front side (the left side in FIG. 2).

[0046] A lead line L18 is formed on the left end (left end in FIG. 2) of the upper front inner flap 3a (first inner flap) and extends downward from the upper end to near the center in the vertical direction of the upper front inner flap 3a. A separation line L19 (slit) is formed on the upper front inner flap 3a and extends horizontally from the lower end of the lead line L18 to the separation line L9.

[0047] A lead line L20 similar to the lead line L18 is formed at the right end of the upper front inner flap 3a (the right end in FIG. 2). A separation line L21 (slit) is formed in the upper front inner flap 3a, extending laterally from the lower end of the lead line L20 to the separation line L10.

[0048] A lead line L22 is formed on the right end (left end in FIG. 2) of the upper surface rear inner flap 3b (second inner flap), extending downward from the upper end to near the center in the vertical direction of the upper surface rear inner flap 3b. A separation line L23 (slit) is formed on the upper surface rear inner flap 3b, extending horizontally from the lower end of the lead line L22 to the separation line L11.

[0049] A lead line L24 is formed on the left end of the upper surface rear inner flap 3b (the right end in FIG. 2), extending downward from the upper end to near the center in the vertical direction of the upper surface rear inner flap 3b. A separation line L25 (slit) is formed on the upper surface rear inner flap 3b, extending horizontally from the lower end of the lead line L22 to the separation line L11.

[0050] In this embodiment, the lead creases L18, L20, L22, and L24 are formed, for example, by a so-called sewing machine blade, and when a force is applied in the bending direction, they are folded more easily than normal creases.

[0051] Next, the operation of folding the corrugated paperboard 10 to assemble the packaging box 1 will be described with reference to Figs.

[0052] 3, the corrugated cardboard 10 is folded along crease lines L1 to L4, and then folded along crease lines L12 and L13, and then folded along crease lines L14 and L15. Then, packing tape (not shown) is applied from the front plate 6 through the bottom outer flaps 4c and 4d to the rear plate 8. This forms the bottom sealing portion 4 that seals the bottom opening of the body 2.

[0053] In a low-height packaging box 1 such as that of this embodiment, the height (height of each of the side panels 5-8) is low, so when the corrugated paperboard 10 is folded along the crease lines L1-L4, the crease lines L1, L3, and L4 (particularly the crease lines L1 and L4) may break. In this embodiment, a connecting line L9 is formed continuous with the crease line L1, a connecting line L10 is formed continuous with the crease line L3, and a connecting line L11 is formed continuous with the crease line L4, so that the rigidity is high when folded and breakage is suppressed compared to a box having slits instead of the connecting lines L9-L11.

[0054] Next, the first adhesive portion 11a of the adhesive piece 11 is adhered to the rear side plate 8, and the second adhesive portion 11b is adhered to the upper surface rear inner flap 3b.

[0055] Then, the upper surface front inner flap 3a is folded along the fold line L5, and the upper surface rear inner flap 3b is folded along the fold line L6.

[0056] The upper front inner flap 3a and the upper left outer flap 3c are connected via a connecting line L9, and remain connected when no force is applied. When force is applied to fold the upper front inner flap 3a along the fold line L5, the connecting line L9 breaks, and the connection is easily released and the two are separated.

[0057] The upper front inner flap 3a and the upper right outer flap 3d are connected via a connecting line L10, and remain connected when no force is applied. When force is applied to fold the upper front inner flap 3a along the fold line L5, the connecting line L10 breaks, and the connection is easily released and the two are separated.

[0058] The upper surface rear inner flap 3b and the upper surface right outer flap 3d are connected via a connecting line L11, and remain connected when no force is applied. When force is applied to fold the upper surface rear inner flap 3b along the fold line L6, the connecting line L11 breaks, and the connection is easily released and the two are separated.

[0059] 3, the left and right side edges of the upper surface front inner flap 3a overlap with the upper surface left outer flap 3c and the upper surface right outer flap 3d. Therefore, when a force is applied in a direction to fold the upper surface front inner flap 3a along the fold line L5, the left and right side edges of the upper surface front inner flap 3a abut against the upper surface left outer flap 3c and the upper surface right outer flap 3d.

[0060] In this embodiment, a lead line L18 and a separation line L19 are formed at the left end of the upper front inner flap 3a, and a lead line L20 and a separation line L21 are formed at the right end of the upper front inner flap 3a.

[0061] With this configuration, when force is applied in the direction of folding the upper surface front inner flap 3a along the crease line L5, as shown in Figure 4, the left and right side edges of the upper surface front inner flap 3a abut against the upper surface left outer flap 3c and the upper surface right outer flap 3d, and are folded outward (toward the front) along the lead lines L18, L20.

[0062] As a result, the upper front inner flap 3a can be easily folded along the fold line L5 simply by applying a small force in the direction of folding the upper front inner flap 3a along the fold line L5.

[0063] 3, the left and right side edges of the upper surface rear inner flap 3b overlap with the upper surface left outer flap 3c and the upper surface right outer flap 3d. Therefore, when a force is applied in a direction to fold the upper surface rear inner flap 3b along the crease line L6, the left and right side edges of the upper surface rear inner flap 3b abut against the upper surface left outer flap 3c and the upper surface right outer flap 3d.

[0064] In this embodiment, the structure is such that under normal circumstances, the left side edge of the upper surface rear inner flap 3b will not abut against the upper surface left outer flap 3c. However, we will explain a case where the left side edge of the upper surface rear inner flap 3b abuts against the upper surface left outer flap 3c due to deformation or the like.

[0065] In this embodiment, a lead line L22 and a separation line L23 are formed at the left end of the upper surface rear inner flap 3b, and a lead line L24 and a separation line L25 are formed at the right end of the upper surface rear inner flap 3b.

[0066] With this configuration, when a force is applied in a direction to fold the top surface rear inner flap 3b along the crease line L6, the right edge of the top surface rear inner flap 3b abuts against the top surface right outer flap 3d and is folded outward (rearward) along the lead line L22, as shown in Fig. 4. Also, when the left edge of the top surface rear inner flap 3b abuts against the top surface left outer flap 3c, it is folded outward (rearward) along the lead line L24.

[0067] As a result, by simply applying a small force in the direction of folding the upper surface rear inner flap 3b along the fold line L6, the upper surface rear inner flap 3b can be easily folded along the fold line L6.

[0068] The upper surface front inner flap 3a is folded along the fold line L5, the upper surface rear inner flap 3b is folded along the fold line L6, and then the upper surface left outer flap 3c is folded along the fold line L7, and the upper surface right outer flap 3d is folded along the fold line L8.

[0069] In the case of a packaging box without grooves between the top flaps, the left and right side edges of the top front inner flap overlap with the top left outer flap and the top right outer flap. Therefore, when the top front inner flap is folded, the left edge of the top front inner flap abuts against the inner surface of the left side plate and pushes the left side plate outward (to the left), and as a result, the right edge of the top front inner flap pushes the right side plate outward (to the right).

[0070] Similarly, when the upper surface rear inner flap is folded, the left edge of the upper surface rear inner flap abuts against the inner surface of the left side plate, pushing the left side plate outward (toward the left), and as a result, the right edge of the upper surface rear inner flap abuts against the inner surface of the right side plate, pushing the right side plate outward (to the right).

[0071] When this type of pushing apart of the left and right side panels occurs, a gap will be created between the tip (right edge) of the top left outer flap and the tip (left edge) of the top right outer flap when the top left outer flap and the top right outer flap are folded.

[0072] In this embodiment, the left side plate 5 is formed with a front recess 5a and a rear recess 5b, and the right side plate 7 is formed with a front recess 7a and a rear recess 7b. When the upper surface front inner flap 3a is folded along the fold line L5, as shown in Fig. 5, the left side edge of the upper surface front inner flap 3a is inserted into the front recess 5a, so the left side plate 5 is not pushed outward. Similarly, the right side plate 7 is not pushed outward, so the right side plate 7 is not pushed outward.

[0073] Similarly, when the top surface rear inner flap 3b is folded along the fold line L6, as shown in Fig. 6, the left edge of the top surface rear inner flap 3b is inserted into the rear recess 5b, so the left side plate 5 is not pushed outward. Similarly, the right edge of the top surface rear inner flap 3b is inserted into the rear recess 7b, so the right side plate 7 is not pushed outward. Note that since the second adhesive portion 11b is formed with a gap between it and the rear edge (the left edge in Fig. 2) of the top surface left outer flap 3c, the second adhesive portion 11b is not normally inserted into the rear recess 5b, but even if the second adhesive portion 11b protrudes to the left in Fig. 6 due to deformation or the like, it is inserted into the rear recess 5b.

[0074] With this configuration, the upper left outer flap 3c and the upper right outer flap 3d can be folded more easily than in the conventional configuration in which there are no recesses 5a, 5b, 7a, 7b and the left side panel 5 and right side panel 7 are pushed outward, thereby improving formability when making the box.

[0075] Furthermore, when the upper left outer flap 3c and the upper right outer flap 3d are folded, it is possible to prevent a gap from being generated between the tip (right edge) of the upper left outer flap 3c and the tip (left edge) of the upper right outer flap 3d (see FIG. 1). This makes it possible to prevent a loss of aesthetics due to the generation of a gap.

[0076] Next, packing tape (not shown) is attached from the front panel 6 through the upper left outer flap 3c and the upper right outer flap 3d to the rear panel 8.

[0077] Although an embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and can be embodied in various forms without departing from the spirit and scope of the present invention.

[0078] In the above embodiment, the packaging box 1 is made of corrugated paperboard 10, but it may be made of paper, resin, or the like.

[0079] In the above embodiment, the packaging box 1 is embodied with both the first invention in which the leading line L18 (first leading line), the separation line L19 (first cut line), the leading line L20 (second leading line), and the separation line L21 (second cut line) are formed on the upper front inner flap 3a, and the leading line L22 (third leading line) and the separation line L23 (third cut line) are formed on the upper rear inner flap 3b (second inner flap), and the second invention in which the left side plate 5 (third side plate) is formed with the front recess 5a (first recess) and the rear recess 5b (second recess) are formed on the fourth side plate, but only one of them may be implemented. In either case, the formability during box making can be improved.

[0080] Although the packaging box 1 of the above embodiment is a box that is relatively low in the height direction, the present invention can be applied to various packaging boxes having a cubic shape or the like.

[0081] In the above embodiment, the lead line L24 and the separation line L25 (slit) are formed in the upper rear inner flap 3b (second inner flap), but they do not necessarily have to be formed.

[0082] In the above embodiment, the left side plate 5 is formed with the rear recess 5b, but it does not have to be formed.

[0083] In the above embodiment, the connecting lines L9 to L11 are provided, but instead of the connecting lines, separation lines (gap) may be provided. Also, the connecting lines L9 and L11 may be provided, and the connecting line L10 may be replaced by a separation line (gap).

[0084] In the above embodiment, the heights of the front recess 5a, the rear recess 5b, the front recess 7a and the rear recess 7b (the vertical length in Figure 2) are formed to be 1.5 times or more the thickness of the corrugated paperboard 10, but it is sufficient that the height of the rear recess 5b is at least 1.5 times the thickness of the corrugated paperboard 10, and the heights of the front recess 5a, the front recess 7a and the rear recess 7b are greater than or equal to the thickness of the corrugated paperboard 10. [Explanation of symbols]

[0085] 1...packaging box, 2...body portion, 3...top sealing portion, 3a...top front inner flap (first inner flap), 3b...top rear inner flap (second inner flap), 3c...top left outer flap (first outer flap), 3d...top right outer flap (second outer flap), 4...bottom sealing portion, 5...left side plate (third side plate), 5a...front recess (first recess), 5b...rear recess (fourth recess), 6...front side plate (first side plate), 7...right side plate (fourth side plate), 7a...front recess (second recess), 7b...rear recess (third Recess) 8... Rear side panel (second side panel), 11... Adhesive strip (stopping margin), L9... Connecting line (first connecting line), L11... Connecting line (second connecting line), L18... Lead line (first lead line), L19... Separating line (first cut line), L20... Lead line (second lead line), L21... Separating line (second cut line), L22... Lead line (third lead line), L23... Separating line (third cut line), L24... Lead line (fourth lead line), L25... Separating line (fourth cut line)

Claims

1. A packaging box including a rectangular tubular body, an upper sealing portion connected to an upper end side of the body and sealing an upper end opening of the body, and a lower sealing portion connected to a lower end side of the body and sealing a lower end opening of the body, the body portion has a first side plate and a second side plate facing each other in a first direction, and a third side plate and a fourth side plate facing each other in a second direction intersecting the first direction, the first side plate being connected to the third side plate and the fourth side plate, and the second side plate being connected to the fourth side plate, the top sealing portion includes a first inner flap connected to the first side plate, a second inner flap connected to the second side plate, a first outer flap connected to the third side plate and covering the first inner flap and the second inner flap, and a second outer flap connected to the fourth side plate and covering the first inner flap and the second inner flap, The first inner flap is formed with a first lead line extending downward from an upper end of an end portion on the boundary line side with the first outer flap, a first score line extending from a lower end of the first lead line to the boundary line with the first outer flap, a second lead line extending downward from an upper end of an end portion on the boundary line side with the second outer flap, and a second score line extending from a lower end of the second lead line to the boundary line with the second outer flap, a third lead line extending downward from an upper end of the end portion on the boundary line side with the second outer flap, and a third score line extending from a lower end of the third lead line to the boundary line with the second outer flap.

2. The packaging box according to claim 1, a fourth lead line extending downward from an upper end of the second inner flap on the side opposite the boundary line with the second outer flap, and a fourth score line extending from a lower end of the fourth lead line to a side edge on the side opposite the boundary line with the second outer flap.

3. A packaging box including a rectangular tubular body, an upper sealing portion connected to an upper end side of the body and sealing an upper end opening of the body, and a lower sealing portion connected to a lower end side of the body and sealing a lower end opening of the body, the body portion has a first side plate and a second side plate facing each other in a first direction, and a third side plate and a fourth side plate facing each other in a second direction intersecting the first direction, the first side plate being connected to the third side plate and the fourth side plate, and the second side plate being connected to the fourth side plate, the top sealing portion includes a first inner flap connected to the first side plate, a second inner flap connected to the second side plate, a first outer flap connected to the third side plate and covering the first inner flap and the second inner flap, and a second outer flap connected to the fourth side plate and covering the first inner flap and the second inner flap, a first recess is formed at an upper end of the third side panel, into which a side edge of the first inner flap on a boundary line side with the first outer flap is inserted when the first inner flap is folded at the boundary line with the first side panel; a second recess into which a side edge portion of the first inner flap on the side of the boundary line with the second outer flap is inserted when the first inner flap is folded along the boundary line with the first side panel, and a third recess into which a side edge portion of the second inner flap on the side of the boundary line with the second outer flap is inserted when the second inner flap is folded along the boundary line with the second side panel.

4. The packaging box according to claim 3, a fourth recess is formed at an upper end of the third side panel, at a position facing the side edge of the second inner flap opposite the boundary line with the second outer flap, into which the side edge of the second inner flap opposite the boundary line with the second outer flap can be inserted when the second inner flap is folded at the boundary line with the second side panel.

5. The packaging box according to any one of claims 1 to 4, The first inner flap and the first outer flap are connected via a first connecting line having a separation line and a connected portion, The packaging box is characterized in that the second inner flap and the second outer flap are connected via a second connecting line having a separation line and a connected portion.

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