Packing box

Abstract

To provide a packing box whose bottom is not easy to open even if an excessive load is applied on the bottom.SOLUTION: In a packing box 1, a bottom part 30 provided in a body part 10 includes left and right side flaps 50, 50 connected respectively to both side walls 12, 12, and connected respectively to both end walls 11, 11, and front and rear end flaps 40, 40 overlapped on the undersides of the side flaps 50, 50. While a connection port 60 extending in the left-right direction is formed across both side flaps 50, 50, an insertion piece 80 connected to the tip edge of the end flap 40 is inserted into the connection port 60, folded back on the end flap 40, and overlapped on the upper surfaces of the side flaps 50, 50.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a packaging box. [Background technology]

[0002] The bottom of some cardboard packaging boxes has a connecting opening that extends left and right across the left and right side flaps, and insertion pieces formed at the tips of the front and rear end flaps are inserted into the connecting opening and placed on top of the side flaps (see, for example, Patent Document 1). In such a packaging box, when the bottom plate is pressed down by the contents, the locking piece is caught on the connecting opening in the direction opposite to the insertion direction, thereby locking the bottom so that it does not open. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-26253 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional packaging box described above, if excessive weight acts on the bottom from inside the body and the locking piece is pulled strongly in the opposite direction to the insertion direction into the connecting port, the locking piece may come off the connecting port.

[0005] An object of the present invention is to solve the above-mentioned problems and to provide a packaging box whose bottom is difficult to open even when an excessive load acts on the bottom from inside the body. [Means for solving the problem]

[0006] To solve the above problems, the present invention provides a packaging box comprising a cylindrical body having front and rear end walls and left and right side walls, and a bottom provided at an opening on the lower side of the body. The bottom has left and right side flaps respectively connected to the lower edges of the both side walls, and front and rear end flaps respectively connected to the lower edges of the both end walls and overlapping the undersides of the both side flaps. A connecting opening is formed extending laterally across the both side flaps, and an insertion piece is inserted into the connecting opening and positioned inside the body, and is connected to the leading edge of the end flaps. The insertion piece is folded back over the end flaps and overlaps the upper surfaces of the both side flaps.

[0007] In the packaging box of the present invention, the locking piece is folded back in the direction opposite to the insertion direction into the connecting opening, and the insertion end flap and the locking piece sandwich a portion of the side flaps from above and below. When contents are placed in the packaging box, the contents rest on the upper surface of the locking piece. This makes it difficult for the insertion piece to come out of the connecting opening of the side flaps, making it difficult for the bottom to open even if an excessive load is applied to the bottom from inside the body.

[0008] In the packaging box, a fold line is formed on the upper surface of the side flap, the fold line extending from the left-right end of the connecting opening to the opposite side of the center region of the side flap in the front-rear direction and toward the center of the bottom in the left-right direction. can . In this configuration, when the insertion piece is inserted into the connecting port from the outside, the end region of the side flap (the region opposite the region closer to the center in the front-to-back direction than the connecting port) is pushed by the insertion piece and bends inward toward the body, widening the connecting port and making it easier to insert the insertion piece into the connecting port.

[0009] In the packaging box described above, when the tip of the insertion piece is brought into contact with the inner surface of the end wall, the insertion piece is unlikely to return when no contents are contained therein. Furthermore, a depression is formed by crushing the inner surface of the end wall at the lower end, and the tip of the insertion piece is brought into contact with the depression, so that the tip of the insertion piece is hooked into the depression, thereby maintaining the insertion piece in a folded state when no contents are contained. can .

[0010] In the packaging box, the end flaps and the insertion pieces may be connected via an intermediate portion that is inserted into the connecting opening and bent relative to the end flaps and the insertion pieces. In the above-described configuration, if the left-right width of the intermediate portion is formed smaller than the left-right width of the tip of the end flap and the base end of the insertion piece, it becomes easier to fold the insertion piece back against the end flap and it becomes more difficult for the insertion piece to return. In the above-described configuration, if a first protruding piece is formed at the base end edge of the insertion piece, separated from the intermediate portion and protruding toward the center of the body portion in the fore-and-aft direction, a portion of the connecting port can be blocked by the first protruding piece.

[0011] If a second protruding piece is formed on the edge of the connecting opening of the packaging box on the central side in the front-to-back direction of the body portion, protruding in the direction opposite to the central area in the front-to-back direction of the body portion, a part of the connecting opening can be blocked by the second protruding piece. [Effects of the Invention]

[0012] In the packaging box of the present invention, the insertion piece connected to the end flap is less likely to come out of the connecting opening of the side flaps, so the bottom is less likely to open even if an excessive load acts on the bottom from inside the body. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a perspective view of a packaging box according to an embodiment of the present invention, viewed from the front lower left. [Figure 2] 1 is a perspective view of a packaging box according to an embodiment of the present invention, viewed from the upper front left. FIG. [Figure 3]1 is a diagram showing a blank sheet for a packaging box according to an embodiment of the present invention; [Figure 4] FIG. 2 is a plan view showing the bottom of the packaging box according to the embodiment of the present invention. [Figure 5] 10 is a perspective view showing a state in which an insertion piece is inserted into a connecting opening in a procedure for assembling the bottom of the packaging box according to the embodiment of the present invention. FIG. [Figure 6] 10 is a plan view showing a state in which an insertion piece is inserted into a connection opening in a procedure for assembling the bottom of the packaging box according to the embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the front, rear, left and right directions are set for the convenience of describing the packaging box of this embodiment, and do not limit the configuration or usage state of the packaging box.

[0015] As shown in FIG. 1, the packaging box 1 of this embodiment is a cardboard box having a cylindrical body 10, a top 20 provided at the upper opening of the body 10, and a bottom 30 provided at the lower opening of the body 10.

[0016] The packaging box 1 of this embodiment is formed by mountain-folding or valley-folding a blank sheet S cut out from a cardboard sheet at each fold line, as shown in Fig. 3. The blank sheet S shown in Fig. 3 is arranged so that the inner side is visible.

[0017] The fold lines of the blank sheet S are creases (pressed creases) formed by linearly pressing the surface of the blank sheet S. Note that intermittent slits may be formed in the creases, which makes it easier to fold the blank sheet S at the creases. Alternatively, the folded line may be formed by forming a half-cut slit only on the surface of the sheet or by forming an intermittent slit that penetrates the sheet. Each cutting guide line formed on the blank sheet S is a perforated line formed by discontinuously forming slits. The shape and length of the slits are not limited.

[0018] 2, the body 10 has a pair of front and rear end walls 11, 11 and a pair of left and right side walls 12, 12. The body 10 is formed in a rectangular cylindrical shape, and rectangular openings are formed on the top and bottom surfaces of the body 10. The end wall 11 and the side wall 12 are formed in a rectangular shape. The end wall 11 and the side wall 12 are connected via a folding line, and the end wall 11 and the side wall 12 are arranged perpendicular to each other. A strip-shaped joining piece 13 is provided continuously at the rear edge of the right side wall 12. This joining piece 13 is joined to the inner surface of the rear end wall 11 with an adhesive. The blank sheet S (see FIG. 3) is folded along each fold line, and the joining piece 13 is joined to the inner surface of the rear end wall 11, thereby forming the cylindrical body 10 that is rectangular in plan view.

[0019] The top 20 closes the upper opening of the body 10 by overlapping front and rear inner flaps 21, 21 connected to the upper edges of both end walls 11, 11, respectively, and left and right outer flaps 22, 22 connected to the upper edges of both side walls 12, 12, respectively.

[0020] As shown in Figure 1, the bottom 30 has a pair of front and rear end flaps 40, 40 connected to the lower edges of the front and rear end walls 11, 11, respectively, and a pair of left and right side flaps 50, 50 connected to the lower edges of the left and right side walls 12, 12, respectively.

[0021] The left side flap 50 is connected to the lower edge of the left side wall 12 via a fold line, and closes the left half of the opening at the bottom of the body 10. The right side flap 50 is connected to the lower edge of the right side wall 12 via a fold line, and closes the right half of the opening at the bottom of the body 10. As shown in Fig. 4, a strip-shaped overlapping portion 51 protruding to the right is formed in the front half of the leading edge of the left side flap 50. Also, a strip-shaped overlapping portion 51 protruding to the left is formed in the rear half of the leading edge of the right side flap 50. The overlapping portion 51 of the left side flap 50 is overlapped on the upper surface of the front portion of the right side flap 50, and the overlapping portion 51 of the right side flap 50 is overlapped on the upper surface of the rear portion of the left side flap 50. In this way, the leading ends of the left and right side flaps 50, 50 are interlocked with each other.

[0022] 6, two connecting openings 60, 60 are formed in the bottom 30 with a gap between them in the front-to-rear direction. Each connecting opening 60 extends in the left-to-right direction across the left and right side flaps 50, 50, and penetrates the side flaps 50. The connecting port 60 of this embodiment has a shape in which elongated openings are connected to both ends of a linear slit. The slit is formed in the center of the connecting port 60, and the left and right openings are formed on the left and right sides of the connecting port 60, extending in the left-right direction.

[0023] The front connecting opening 60 is formed in the front part of the bottom part 30. Left and right second protruding pieces 61, 61 that protrude forward (opposite the region on the central side in the front-to-back direction of the body part 10) are formed in the left and right parts of the rear edge part of the front connecting opening 60 (the edge part on the central side in the front-to-back direction of the body part). The left and right parts of the connecting opening 60 are closed by the left and right second protruding pieces 61, 61, respectively. Two left and right fold lines L1, L1 are formed on the upper surfaces (inner surfaces) of the front portions of the side flaps 50, 50. The front fold line L1 extends forward from the left and right ends of the front connecting opening 60 (on the side opposite the central region of the side flaps 50 in the front-to-rear direction) and toward the central region of the bottom 30 in the left-to-right direction.

[0024] The rear connecting port 60 is formed at the rear of the bottom 30. The rear connecting port 60 is formed symmetrically in the front-to-rear direction with respect to the front connecting port 60. Like the front connecting port 60, the left and right portions of the rear connecting port 60 are also closed by left and right second protruding pieces 61, 61, respectively. Two fold lines L1, L1 are formed on the upper surface (inner surface) of the rear portion of each side flap 50. The rear fold line L1 extends from the left and right ends of the rear connecting opening 60 rearward (the side of the side flap 50 opposite the central region in the front-to-rear direction) and toward the central region of the bottom 30 in the left-to-right direction.

[0025] As shown in Fig. 3, a flattening process is applied to regions 52 (corner regions defined by two-dot chain lines in Fig. 3) including the connecting opening 60 and the folding line L1 on the inner surfaces of the front and rear corners at the tip side of the side flaps 50. As a result, the regions 52 of the side flaps 50 are thinner than other portions of the side flaps 50.

[0026] As shown in Fig. 1, the front end flap 40 is connected to the lower edge of the front end wall 11 via a fold line. The front end flap 40 is overlapped with the front portions of the lower surfaces (outer surfaces) of the side flaps 50, 50. The width of the front end flap 40 in the left-right direction decreases toward the front, and the front end flap 40 is formed in a substantially trapezoidal shape (see Fig. 3).

[0027] As shown in Fig. 3, an intermediate portion 70 is connected to the leading edge of the front end flap 40 via a folding line. The intermediate portion 70 is formed in a strip shape along the leading edge of the front end flap 40. The center of the intermediate portion 70 is open.

[0028] An insertion piece 80 is connected via a fold line to the tip edge of the intermediate portion 70. The end flap 40 and the insertion piece 80 are connected via the intermediate portion 70. The width of the intermediate portion 70 in the left-right direction is smaller than the width of the tip end of the end flap 40 and the base end of the insertion piece 80 in the left-right direction.

[0029] As shown in FIG. 4, the insertion piece 80 is formed so that the width of the tip end in the left-right direction is smaller than the width of the base end in the left-right direction, and is formed in a substantially trapezoidal shape. A first protruding piece 82 protruding toward the middle portion 70 is formed at the base end edge of the insertion piece 80. In the state of the blank sheet S shown in Figure 3, the opening in the center of the middle portion 70 is blocked by the first protruding piece 82. The end flap 40 and the middle portion 70 are connected to the first protruding piece 82 via a slit.

[0030] The entire inner surface of the insertion piece 80 and the entire inner surface of the middle portion 70 are crushed. As a result, the insertion piece 80 and the middle portion 70 are thinner than the end flaps 40.

[0031] As shown in Fig. 2, the front insertion piece 80 is inserted into the front connecting port 60 from the bottom (outside) and is disposed inside the body 10. Furthermore, as shown in Fig. 1, the insertion piece 80 is folded forward relative to the end flap 40 and overlaps the front portions of the upper surfaces of the side flaps 50, 50. In other words, the front end flap 40 and the insertion piece 80 sandwich the front portions of the side flaps 50, 50. The middle portion 70 is inserted into the connecting opening 60 and is bent toward the end flap 40 and the insertion piece 80 .

[0032] As shown in FIG. 4, when the front insertion piece 80 is folded back relative to the intermediate portion 70, the first protruding piece 82 is separated from the intermediate portion 70 and protrudes rearward. When the intermediate portion 70 is placed inside the connecting port 60, the center of the connecting port 60 is open, but this opening is blocked by the first protruding piece 82 of the insertion piece 80. In addition, at the left and right portions of the connecting port 60, gaps are formed between the edges of the connecting port 60 and the intermediate portion 70, but these gaps are blocked by the second protruding pieces 61.

[0033] 2, a depression 15 is formed by crushing in the center of the lower end of the inner surface of the front end wall 11. The tip 81 of the front insertion piece 80 abuts against the center of the lower end of the inner surface of the front end wall 11, and the tip 81 of the insertion piece 80 fits into the depression 15.

[0034] 1, the rear end flap 40 is connected to the lower edge of the rear end wall 11 via a fold line. The rear end flap 40 is formed symmetrically with respect to the front end flap 40, and is overlapped with the rear portions of the lower surfaces of the side flaps 50, 50. As shown in FIG. 3, an insertion piece 80 is also connected to the leading edge of the rear end flap 40 via an intermediate portion 70 .

[0035] 1, the rear insertion piece 80 is inserted into the front connecting opening 60 from below (outside), folded back toward the rear relative to the end flap 40, and overlapped with the rear of the upper surface of the side flaps 50, 50. In addition, as shown in FIG. 2, the tip 81 of the rear insertion piece 80 fits into the recess 15 on the inner surface of the rear end wall 11.

[0036] When assembling the bottom 30 of the packaging box 1 of this embodiment, first, as shown in FIG. 5, the left and right side flaps 50, 50 are folded inward of the body 10 with respect to the left and right side walls 12, 12. Then, the overlapping portion 51 of the left side flap 50 is overlapped on the upper surface of the right side flap 50, and the overlapping portion 51 of the right side flap 50 is overlapped on the upper surface of the left side flap 50. In this way, the tip ends of the left and right side flaps 50, 50 are interlocked with each other.

[0037] Next, the front and rear end flaps 40, 40 are folded inward relative to the front and rear end walls 11, 11 of the body 10, and the insertion piece 80 is folded upward relative to the end flap 40. As a result, the end flap 40 and the insertion piece 80 are folded in a valley fold as viewed from the outside, with the middle portion 70 as the bent portion. At this time, the first protruding piece 82 of the insertion piece 80 is cut off from the middle portion 70.

[0038] 6, when the insertion piece 80 is inserted into the connecting opening 60, the region of the side flap 50 that is forward of the front connecting opening 60 is pressed by the insertion piece 80 and bends at fold line L1 toward the inside of the body 10. Similarly, the region of the side flap 50 that is rearward of the rear connecting opening 60 is also pressed by the insertion piece 80 and bends at fold line L1 toward the inside of the body 10. This widens the connecting opening 60, making it easier to insert the insertion piece 80 into the connecting opening 60.

[0039] Then, as shown in FIG. 2, the entire insertion piece 80 is placed inside the body 10, and the insertion piece 80 is folded back onto the end flap 40, with the end flap 40 overlapping the upper surfaces of the side flaps 50, 50.

[0040] At this time, the tip 81 of the insertion piece 80 abuts against the recess 15 of the end wall 11. As a result, the tip 81 of the insertion piece 80 is caught in the recess 15 of the end wall 11, making it difficult for the insertion piece 80 to return when no contents are stored. In this way, the insertion piece 80 can be kept folded back against the end flap 40.

[0041] 5, the width of the middle portion 70 in the left-right direction is smaller than the width of the tip end of the end flap 40 and the base end of the insertion piece 80 in the left-right direction. The middle portion 70 is also crushed. This makes it easy to fold the insertion piece 80 back onto the end flap 40, but also makes it difficult for the insertion piece 80 to return.

[0042] In the packaging box 1 described above, as shown in Fig. 1, portions of the side flaps 50, 50 are sandwiched from above and below by the end flap 40 and the insertion piece 80. When contents are placed inside the packaging box 1, the contents rest on the upper surface of the insertion piece 80. As a result, in the packaging box 1 of this embodiment, the insertion piece 80 is unlikely to come out of the connecting opening 60 of the side flaps 50, 50. Also, in the packaging box 1 of this embodiment, the leading ends of the left and right side flaps 50, 50 are interlocked with each other. Therefore, in the packaging box 1 of this embodiment, even if an excessive load acts on the bottom 30 from the inside of the body 10, the bottom 30 is unlikely to open.

[0043] 4, in the packaging box 1 of this embodiment, the opening in the center of the connecting port 60 is blocked by the first protruding piece 82 of the insertion piece 80, and the gaps on the left and right sides of the connecting port 60 are blocked by the left and right second protruding pieces 61, 61. This allows the packaging box 1 of this embodiment to improve the airtightness of the bottom 30.

[0044] The insert piece 80 and the side flap 50 of the packaging box 1 of this embodiment are each subjected to a crushing process in the overlapping area. Therefore, even when the insert piece 80 is overlapped on the upper surfaces of the side flaps 50, 50 as shown in Fig. 1, the step on the upper surface of the bottom 30 can be reduced, and the contents can be prevented from getting caught on the step.

[0045] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and can be modified as appropriate within the scope of the invention. 2, the packaging box 1 of this embodiment has a recess 15 formed on the inner surface of the end wall 11, but the tip 81 of the insertion piece 80 may be abutted against the inner surface of the end wall 11 without forming the recess 15 on the inner surface of the end wall 11. Furthermore, the tip 81 of the insertion piece 80 may not be abutted against the inner surface of the end wall 11.

[0046] In the packaging box 1 of this embodiment, as shown in Figure 6, a fold line L1 extending from the left and right ends of the connecting opening 60 is formed on the upper surface of the side flap 50, but it is not necessary to form the fold line L1 on the upper surface of the side flap 50.

[0047] In the packaging box 1 of this embodiment, the insertion piece 80 and the side flap 50 are each crushed in the areas where they overlap, but it is not necessary to crush the insertion piece 80 and the side flap 50.

[0048] In the packaging box 1 of this embodiment, as shown in Figure 4, the insertion piece 80 is formed so that the width in the left-right direction at the tip end is smaller than the width in the left-right direction at the base end, but the shape and size of the insertion piece 80 are not limited.

[0049] In the packaging box 1 of this embodiment, the leading ends of the left and right side flaps 50, 50 are interlocked with each other, but the leading edge portions of the left and right side flaps 50, 50 may be butted against each other.

[0050] In the packaging box 1 of this embodiment, as shown in Figure 2, the body 10 is formed in a rectangular cylindrical shape having a pair of front and rear end walls 11, 11 and a pair of left and right side walls 12, 12, but the shape of the body 10 is not limited, and an inclined wall may be provided between the end wall 11 and the side wall 12.

[0051] In the packaging box 1 of this embodiment, the upper opening of the body 10 is closed by the top 20, but the configuration of the top 20 is not limited, and the center may be open. Furthermore, the packaging box 1 does not have to have a top 20.

[0052] The packaging box 1 of this embodiment is made of corrugated cardboard, but the packaging box 1 can also be made of various known paperboards. [Explanation of symbols]

[0053] 1 packaging box 10. Torso 11 End Wall 12 Side wall 13 Joint piece 15 recess 20 Top 21 Inner flap 22 outer flap 30 bottom 40 End flap 50 Side flap 51 overlapping part 60 connection port 61 Second protruding piece 70 Middle section 80 Insert 81 Tip 82 First protruding piece S Blank Sheet

Claims

1. a cylindrical body portion having front and rear end walls and left and right side walls; a bottom portion provided at an opening on the lower side of the body portion, The bottom portion is left and right side flaps respectively connected to the lower edge portions of the side walls; front and rear end flaps connected to the lower edge portions of the end walls and overlapping the lower surfaces of the side end flaps; A connecting opening is formed extending in the left-right direction across the both side flaps, An insertion piece is inserted into the connecting port and disposed inside the body portion at the tip edge of the end flap, The insertion piece is folded back relative to the end flap and overlaps the upper surface of the side flaps, A packaging box characterized in that a fold line is formed on the upper surface of the side flap, extending from the left-right end of the connecting opening to the opposite side of the central area of ​​the side flap in the front-to-back direction and toward the left-to-right center of the bottom.

2. a cylindrical body portion having front and rear end walls and left and right side walls; a bottom portion provided at an opening on the lower side of the body portion, The bottom portion is left and right side flaps respectively connected to the lower edge portions of the side walls; front and rear end flaps connected to the lower edge portions of the end walls and overlapping the lower surfaces of the side end flaps; A connecting opening is formed extending in the left-right direction across the both side flaps, An insertion piece is inserted into the connecting port and disposed inside the body portion at the tip edge of the end flap, The insertion piece is folded back relative to the end flap and overlaps the upper surface of the side flaps, A depression is formed at the lower end of the inner surface of the end wall by crushing, A packaging box characterized in that the tip of the insertion piece abuts against the recess on the inner surface of the end wall.

3. a cylindrical body portion having front and rear end walls and left and right side walls; a bottom portion provided at an opening on the lower side of the body portion, The bottom portion is left and right side flaps respectively connected to the lower edge portions of the side walls; front and rear end flaps connected to the lower edge portions of the end walls and overlapping the lower surfaces of the side end flaps; A connecting opening is formed extending in the left-right direction across the both side flaps, An insertion piece is inserted into the connecting port and disposed inside the body portion at the tip edge of the end flap, The insertion piece is folded back relative to the end flap and overlaps the upper surface of the side flaps, The end flap and the insertion piece are connected via an intermediate portion, the intermediate portion is inserted into the connecting port and bent toward the end flap and the insertion piece; A packaging box characterized in that a first protruding piece is formed at the base end edge of the insertion piece, separated from the intermediate portion and protruding toward the center of the body portion in the front-to-rear direction.

4. The packaging box according to claim 1 or claim 3, A packaging box characterized in that the tip of the insertion piece abuts against the inner surface of the end wall.

5. The packaging box according to claim 1 or 2, The end flap and the insertion piece are connected via an intermediate portion, the intermediate portion is inserted into the connecting port and bent toward the end flap and the insertion piece; A packaging box characterized in that the width in the left-right direction of the middle portion is formed to be smaller than the width in the left-right direction of the tip end of the end flap and the base end of the insertion piece.

6. A packaging box according to claim 3, A packaging box characterized in that the width in the left-right direction of the middle portion is formed to be smaller than the width in the left-right direction of the tip end of the end flap and the base end of the insertion piece.

7. The packaging box according to any one of claims 1 to 6, A packaging box characterized in that, at the connecting opening, a second protruding piece is formed on the edge portion of the body portion on the center side in the front-to-back direction, protruding toward the opposite side from the center area of ​​the body portion in the front-to-back direction.

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