Packaging box

Abstract

To provide a packaging box which realizes high compressive strength without causing high cost.SOLUTION: A pair of length surfaces 100A formed to face each other, a pair of opposite width surfaces 200A provided between the pair of length surfaces 100A, a pair of upper outer flaps 110A extending from upper edges of the pair of length surfaces 100A, a pair of upper inner flaps 210A extending from upper edges of the pair of width surfaces 200A, a pair of lower outer flaps 120A extending from lower edges of the pair of length surfaces 100A, A pair of lower side inner flap side walls are provided extending from lower edges of the pair of width-face side walls, and out of an upper side inner flap ruled line side 200A formed at an upper edge that is a boundary between the pair of upper side inner flap side walls and the pair of length-face side walls, and an upper side inner flap ruled line side 220A formed at an upper edge that is a boundary between the pair of upper side inner flap side walls and the pair of width-face side walls, the upper side inner flap ruled line side 110A is formed at a higher position than the upper side outer flap ruled line side 100A. 130A 230A 230A 130A 110A 200A.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Packaging boxes made of corrugated cardboard or the like are generally stacked in several layers with products stored inside, that is, stacked in layers. When packaging boxes are stacked in this way, the weight of the packaging box stacked on the top tier, i.e., the weight of the products stored therein, is placed on the packaging box on the bottom tier. For this reason, this type of packaging box is required to have high compressive strength so that it can withstand stacking.

[0003] In order to achieve high compressive strength, it is necessary to use high-strength cardboard as the material itself, and to place reinforcing wall materials inside the packaging box to withstand vertical forces. Furthermore, as described in Utility Model Registration No. 3170254, there is also a cardboard box that aims to achieve high compressive strength by "making use of a single cardboard sheet consisting of a front liner, a core, and a back liner, and having a polygonal tubular section with more than one side, formed so that the ridge direction of the core is in the height direction, and having perforation lines consisting of a repetition of cut lines and non-cut lines provided on at least two non-adjacent side edges of the polygonal tubular section."

[0004] [Patent Document 1] Utility Model Registration No. 3170254 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0005] However, there is a problem in that using a strong cardboard itself or providing a reinforcing wall material inside the packaging box increases costs.

[0006] The present invention has been devised in view of the above circumstances, and has as its object to provide a packaging box that achieves high compressive strength without incurring high costs. [Means for solving the problem]

[0007] The packaging box of the present invention comprises a pair of opposing length surfaces, a pair of opposing width surfaces provided between the pair of length surfaces, a pair of upper outer flaps extending from the upper edges of the pair of length surfaces, a pair of upper inner flaps extending from the upper edges of the pair of width surfaces, a pair of lower outer flaps extending from the lower edges of the pair of length surfaces, and a pair of lower inner flaps extending from the lower edges of the pair of width surfaces, and the upper outer flap crease formed at the boundary between the pair of upper outer flaps and the pair of length surfaces is higher than the upper inner flap crease formed at the boundary between the pair of upper inner flaps and the width surfaces.

[0008] The upper inner flap crease is a curved line that protrudes downward on the packaging box.

[0009] Another packaging box according to the present invention comprises a pair of opposing lengthwise faces, a pair of opposing widthwise faces provided between the pair of lengthwise faces, a pair of upper outer flaps extending from the upper edges of the pair of lengthwise faces, a pair of upper inner flaps extending from the upper edges of the pair of widthwise faces, a pair of lower outer flaps extending from the lower edges of the pair of lengthwise faces, and a pair of lower inner flaps extending from the lower edges of the pair of widthwise faces, wherein the upper outer flap crease formed at the boundary between the pair of upper outer flaps and the pair of lengthwise faces and the upper inner flap crease formed at the boundary between the pair of upper inner flaps and the widthwise faces have the lowest part at the same height as the upper outer flap crease.

[0010] In addition, the upper inner flap crease of another packaging box according to the present invention is a curved line that is convex downward of the packaging box.

[0011] Furthermore, another packaging box according to the present invention comprises a pair of length surfaces formed opposite each other, a pair of width surfaces formed opposite each other between the pair of length surfaces, a pair of upper outer flaps extending from the upper edges of the pair of length surfaces, a pair of upper inner flaps extending from the upper edges of the pair of width surfaces, a pair of lower outer flaps extending from the lower edges of the pair of length surfaces, and a pair of lower inner flaps extending from the lower edges of the pair of width surfaces, and the upper inner flap creases are curved lines that convex downwardly of the packaging box. [Effects of the Invention]

[0012] The packaging box of the present invention has an upper outer flap crease formed at the boundary between a pair of upper outer flaps and a pair of length faces, and an upper inner flap crease formed at the boundary between a pair of upper inner flaps and a width face, and the upper inner flap crease is formed at a higher position than the upper outer flap crease, thereby increasing the strength of the corners of the packaging box. Therefore, the overall compressive strength can be increased.

[0013] Furthermore, experiments have confirmed that the compressive strength can be reliably increased by forming the upper inner flap crease in a curved line that is convex downward toward the packaging box. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a schematic development view of a packaging box according to a first embodiment of the present invention. [Figure 2] 1 is a schematic enlarged view showing a main part of a development view of a packaging box according to a first embodiment of the present invention. [Figure 3] FIG. 10 is a schematic development view of a packaging box according to a second embodiment of the present invention. [Figure 4] FIG. 10 is a schematic enlarged view showing a main part of a development view of a packaging box according to a second embodiment of the present invention. [Figure 5] 1 is a schematic perspective view illustrating that the packaging box according to the present invention has superior compressive strength to conventional packaging boxes. DETAILED DESCRIPTION OF THE INVENTION

[0015] The packaging box 1000A according to the embodiment of the present invention includes a pair of length surfaces 100A formed opposite to each other, a pair of width surfaces 200A opposed to each other and provided between the pair of length surfaces 100A, a pair of upper outer flaps 110A extending from upper edges of the pair of length surfaces 100A, a pair of upper inner flaps 210A extending from upper edges of the pair of width surfaces 200A, a pair of lower outer flaps 120A extending from lower edges of the pair of length surfaces 100A, and a pair of It is provided with a pair of lower inner flaps 220A extending from the lower edge of the width surface 200A, and an upper outer flap crease 130A is formed at the upper edge that is the boundary between the pair of upper outer flaps 110A and the pair of length surfaces 100A, and an upper inner flap crease 230A is formed at the upper edge that is the boundary between the pair of upper inner flaps 210A and the pair of width surfaces 200A, with the upper inner flap crease 230A being formed at a higher position than the upper outer flap crease 130A.

[0016] This packaging box 1000A is of a type known as Type A. Type A is a cardboard box with flaps on the top and bottom of the lengthwise surface 100A and the widthwise surface 200A. However, it goes without saying that the present invention is not limited to Type A and includes other types of packaging boxes.

[0017] The pair of length faces 100A and the pair of width faces 200A are both formed in a rectangular or square shape with all four corners being right angles.

[0018] A joint margin 300A is formed on the outer edge of one of the pair of length faces 100A (the left length face 100A in FIG. 1), which is connected to the inside of the outer edge of the other width face 200A (the right width face 200A in FIG. 1) with an adhesive or the like. A joint margin crease 400A is formed between the joint margin 300A and the longitudinal surface 100A. Furthermore, a vertical crease 410A is formed between the length surface 100A and the width surface 200A, and is folded to form a ridge when assembling the packaging box 1000A.

[0019] The upper outer flap 110A is set to a size such that when folded inward in the assembled state of the packaging box 1000A, it covers the entire upper opening of the packaging box 1000A.

[0020] An upper outer flap crease 130A for folding the upper outer flap 110A is formed on the upper edge, which is the boundary between the pair of upper outer flaps 110A and the pair of longitudinal faces 100A. This upper outer flap crease 130A is formed in a straight line. This upper outer flap crease 130A is the portion where the upper outer flap 110A is folded.

[0021] Meanwhile, an upper inner flap crease 230A for folding the upper inner flap 210A is formed on the upper edge, which is the boundary between the pair of upper inner flaps 210A and the pair of width surfaces 200A. This upper inner flap crease 230A is formed in a straight line. This upper inner flap crease 230A is the portion where the upper inner flap 210A is folded.

[0022] The upper outer flap crease 130A and the upper inner flap crease 230A are both formed in a straight line, but are not at the same height; the upper inner flap crease 230A is formed at a higher position than the upper outer flap crease 130A.

[0023] The imaginary line α shown by the dotted line in Figure 2 indicates the same height as the upper outer flap crease 130A, and it can be seen that the upper inner flap crease 230A is at a higher position than this imaginary line α by a gap G. That is, it can be seen that the upper inner flap crease 230A is formed at a higher position than the upper outer flap crease 130A.

[0024] At the lower edge, which is the boundary between the pair of longitudinal faces 100A and the pair of lower outer flaps 120A, a lower outer flap crease 140A for folding the lower outer flaps 120A is formed. The lower outer flap crease 140A is formed in a straight line.

[0025] At the lower edge, which is the boundary between the pair of width faces 200A and the pair of lower inner flaps 220A, a lower inner flap crease 240A for folding the lower inner flaps 220A is formed. The lower inner flap crease 240A is formed in a straight line.

[0026] The lower outer flap crease 140A and the lower inner flap crease 240A, both of which are formed in a straight line, are formed at the same height, that is, in a straight line. However, the present invention is not limited to this configuration, and includes a configuration in which the lower outer flap crease 140A and the lower inner flap crease 240A are not at the same height, but one of them is higher.

[0027] The packaging box 1000A, whose parts are configured in this manner, is folded along three vertical lines 410A, and the joint 300A on one length surface 100A is connected to the inside of the outer edge of the other width surface 200A (the right width surface 200A in Figure 1) with adhesive or the like.The pair of lower inner flaps 220A are folded along the lower inner flap line 240A, and then the pair of lower outer flaps 120A are folded along the lower outer flap line 140A and fixed using adhesive tape or the like, so that the upper opening is open, i.e., a product can be stored inside.

[0028] After the items are stored inside the packaging box 1000A, the top side is closed. That is, after folding the pair of upper inner flaps 210A from the upper inner flap crease 230A, the pair of upper outer flaps 110A are folded at the upper outer flap crease 130A and fixed using adhesive tape or the like, thereby closing the packaging box 1000A.

[0029] In this state, the upper inner flap crease 230A is formed at a higher position than the upper outer flap crease 130A, so the upper outer flap 110A is positioned slightly higher than the upper inner flap 210A. This increases the strength of the corners of the packaging box, meaning that when pressure is applied to the packaging box 1000A from above, for example when a large number of packaging boxes 1000A containing products are stacked together, the lower packaging box 1000A is less likely to be crushed.

[0030] In the above-described packaging box 1000A, the upper inner flap crease 230A is formed at a higher position than the upper outer flap crease 130A, and the upper inner flap crease 230A is linear. The packaging box 1000B according to the second embodiment of the present invention, which will be described next, differs from the above-described one in that the upper inner flap line 230B is not straight but is a curved line that convex downward.

[0031] The packaging box 1000B includes a pair of length sides 100B formed opposite to each other, a pair of width sides 200B formed opposite to each other between the pair of length sides 100B, a pair of upper outer flaps 110B extending from upper edges of the pair of length sides 100B, a pair of upper inner flaps 210B extending from upper edges of the pair of width sides 200B, a pair of lower outer flaps 120B extending from lower edges of the pair of length sides 100B, and a pair of width sides 200B extending from upper edges of the pair of length sides 100B. It has a pair of lower inner flaps 220B extending from the lower edge of the face 200B, and has an upper outer flap crease 130B formed at the boundary between the pair of upper outer flaps 110B and the pair of length faces 100B, and an upper inner flap crease 230B formed at the boundary between the pair of upper inner flaps 210B and the width face 200B, and the upper inner flap crease 230B is a curved line that convexly extends downward in the packaging box 1000B.

[0032] The imaginary line β shown in FIG. 4 by a dotted line indicates the same height as the upper outer flap crease 130B, and it can be seen that the lowest position of this imaginary line β and the upper inner flap crease 230B is the same height as the upper outer flap crease 130B.

[0033] This packaging box 1000B is also of a type known as Type A. Type A is a type of cardboard box that has flaps on the top and bottom of the lengthwise surface 100B and the widthwise surface 200B. However, it goes without saying that the present invention is not limited to Type A and includes other types of packaging boxes.

[0034] The pair of length faces 100B and the pair of width faces 200B are both formed in a rectangular or square shape with all four corners being right angles.

[0035] A joint margin 300B is formed on the outer edge of one of the pair of length faces 100B (the left length face 100B in FIG. 3 ), which is connected to the inside of the outer edge of the other width face 200B (the right width face 200B in FIG. 3 ) with an adhesive or the like. A joint margin crease 400B is formed between the joint margin 300B and the longitudinal surface 100B. Furthermore, a vertical crease 410B is formed between the length surface 100B and the width surface 200B, and is folded to form a ridge when assembling into a packaging box 1000B.

[0036] The upper outer flap 110B is set to a size such that when folded inward in the assembled state of the packaging box 1000B, it covers the entire upper opening of the packaging box 1000B.

[0037] An upper outer flap crease 130B for folding the upper outer flap 110B is formed on the upper edge, which is the boundary between the pair of upper outer flaps 110B and the pair of longitudinal faces 100B. This upper outer flap crease 130B is formed in a straight line. This upper outer flap crease 130B is the portion where the upper outer flap 110B is folded.

[0038] Meanwhile, an upper inner flap crease 230B for folding the upper inner flap 210B is formed on the upper edge, which is the boundary between the pair of upper inner flaps 210B and the pair of width surfaces 200B. This upper inner flap crease 230B is a curved line that convexly extends downward of the packaging box 1000B. This upper inner flap crease 230B is the portion where the upper inner flap 210B is folded.

[0039] The lowest position of this curved line-shaped upper inner flap crease 230B that is convex downward is equal to the height of the upper outer flap crease 130B. However, this does not limit the present invention, and it goes without saying that the entire curved line of the upper inner flap crease 230B may be higher or lower than the upper outer flap crease 130B. In other words, regardless of the height of the upper inner flap crease 230B, it also includes a packaging box in which the upper inner flap crease 230B is formed as a curved line that convex downward, such as in the packaging box of claim 4.

[0040] At the lower edge, which is the boundary between the pair of longitudinal faces 100B and the pair of lower outer flaps 120B, a lower outer flap crease 140B for folding the lower outer flaps 120B is formed. The lower outer flap crease 140B is formed in a straight line.

[0041] At the lower edge, which is the boundary between the pair of width faces 200B and the pair of lower inner flaps 220B, a lower inner flap crease 240B for folding the lower inner flaps 220B is formed. The lower inner flap crease 240B is formed in a straight line.

[0042] The lower outer flap crease 140B and the lower inner flap crease 240B, both of which are formed in a straight line, are formed at the same height, that is, in a straight line. However, the present invention is not limited to this configuration, and includes a configuration in which the lower outer flap crease 140B and the lower inner flap crease 240B are not at the same height, but one of them is higher.

[0043] The compressive strength of the packaging box 1000A and the packaging box 1000B configured as described above will be compared with that of a conventional packaging box through an experiment.

[0044] First, Table 1 shows the compressive strength of the 1000A packaging box, made of corrugated cardboard known as A-flute, and a conventional packaging box. A-flute is a corrugated cardboard with a corrugated core between the front and back liners, with 34±2 rows per 30 cm and a row height of approximately 5 mm. In addition, (1) in Table 1 is the value for the current packaging box, and (2) is the value for the packaging box 1000A of the present invention. In the packaging box 1000A shown in (2), the upper inner flap crease 230A is formed at a position 2 mm higher than the upper outer flap crease 130A.

[0045] In Tables 1 to 4, the maximum load refers to the load at which each packaging box was crushed when a load was applied from above, and the maximum distortion refers to the distance by which the height of each packaging box was reduced when a load was applied from above and the packaging box was crushed. In addition, each compression test was carried out by placing each packaging box on a flat plate, and then placing another flat plate on the top surface of each packaging box and applying a load via the upper plate.

[0046] [Table 1]

[0047] Next, Table 2 shows the compressive strength of packaging box 1000A and packaging box 1000B, which are made of corrugated cardboard called B flute, and a conventional packaging box. B-flute is a corrugated cardboard with a corrugated core between the front and back liners, with 50±2 rows per 30cm and a row height of approximately 3mm. In Table 2, (3) is the value for a conventional packaging box, (4) is the value for packaging box 1000A in which the upper inner flap crease 230A is positioned 2 mm higher than the upper outer flap crease 130A, and (5) is the value for packaging box 1000B in which the upper inner flap crease 230B is 2 mm higher than the upper outer flap crease 130B and is curved.

[0048] [Table 2]

[0049] Furthermore, Table 3 shows the strength of packaging box 1000A and packaging box 1000B made of corrugated cardboard called C-flute, and a conventional packaging box. C-flute is a type of corrugated cardboard with a corrugated core between the front and back liners, with 40±2 rows per 30cm and a row height of approximately 4mm. In Table 3, (6) is the value for a conventional packaging box, (7) is the value for packaging box 1000A in which the upper inner flap crease 230A is positioned 3 mm higher than the upper outer flap crease 130A, and (8) is the value for packaging box 1000B in which the upper inner flap crease 230B is 3 mm higher than the upper outer flap crease 130B and is curved.

[0050] [Table 3]

[0051] Furthermore, Table 4 shows the strength of the packaging box 1000A, which is made of corrugated cardboard called W-flute, and a conventional packaging box. W-flute is a cardboard that combines the above-mentioned A-flute (height approximately 5 mm) and B-flute (height approximately 3 mm), resulting in a height of approximately 8 mm. In Table 4, (9) is the value for the conventional packaging box, and (10) is the value for the packaging box 1000A in which the upper inner flap crease 230A is positioned 2 mm higher than the upper outer flap crease 130A.

[0052] [Table 4]

[0053] The above-mentioned experimental results reveal that the packaging boxes 1000A and 1000B of the present invention have superior compressive strength to conventional packaging boxes.

[0054] Furthermore, Tables 2 and 3 reveal that packaging box 1000B, in which upper inner flap crease 230B is higher than upper outer flap crease 130B and is curved, has better compression strength than packaging box 1000A, in which upper inner flap crease 230A is higher than upper outer flap crease 130A and is straight.

[0055] The reason why the above-described packaging boxes 1000A and 1000B have a larger maximum load, i.e., superior compressive strength, than conventional boxes is as follows. When this type of packaging box is stacked, the load from above is supported by the four corners K. By making the upper inner flaps 210A, 210B higher than the upper outer flaps 110A, 110B as in the packaging boxes 1000A, 1000B, when the upper outer flaps 110A, 110B are folded, four corners K stand up as shown in Fig. 5 (indicated by circles in Fig. 5). As a result, the load from above is concentrated on the four standing corners K, and the packaging boxes 1000A, 1000B can have excellent compressive strength. For the sake of explanation, FIG. 5 shows the four corners K in an exaggerated manner.

[0056] In the above-described embodiment, the length surfaces 100A, 100B, width surfaces 200A, 200B, upper outer flaps 110A, 110B, upper inner flaps 210A, 210B, lower outer flaps 120A, 120B, and lower inner flaps 220A, 220B are all flat surfaces, and no openings or the like are formed, but it goes without saying that the present invention is not limited to this, and openings or cutouts may be formed as necessary. [Explanation of symbols]

[0057] 100A length surface 110A Upper outer flap 120A Lower outer flap 130A Upper outer flap crease 140A Lower outer flap crease 200A width side 210A Upper inner flap 220A Lower inner flap 230A Upper inner flap crease 240A Lower inner flap crease 1000A packaging box 100B length surface 110B Upper outer flap 120B Lower outer flap 130B Upper outer flap crease 140B Lower outer flap crease 200B Width side 210B Upper inner flap 220B Lower inner flap 230B Upper inner flap crease 240B Lower inner flap crease 1000B packaging box

Claims

1. a pair of opposing lengthwise faces, a pair of opposing widthwise faces between the pair of lengthwise faces, a pair of upper outer flaps extending from upper edges of the pair of lengthwise faces, a pair of upper inner flaps extending from upper edges of the pair of widthwise faces, a pair of lower outer flaps extending from lower edges of the pair of lengthwise faces, and a pair of lower inner flaps extending from lower edges of the pair of widthwise faces, wherein an upper outer flap crease formed at the boundary between the pair of upper outer flaps and the pair of lengthwise faces and an upper inner flap crease formed at the boundary between the pair of upper inner flaps and the widthwise faces are positioned higher than the upper outer flap crease.

2. a pair of opposing lengthwise faces, a pair of opposing widthwise faces between the pair of lengthwise faces, a pair of upper outer flaps extending from upper edges of the pair of lengthwise faces, a pair of upper inner flaps extending from upper edges of the pair of widthwise faces, a pair of lower outer flaps extending from lower edges of the pair of lengthwise faces, and a pair of lower inner flaps extending from lower edges of the pair of widthwise faces, wherein an upper outer flap crease formed at the boundary between the pair of upper outer flaps and the pair of lengthwise faces and an upper inner flap crease formed at the boundary between the pair of upper inner flaps and the widthwise faces have the lowest part at the same height as the upper outer flap crease.

3. 3. The packaging box according to claim 1, wherein the upper inner flap crease is a curved line that is convex downward.

4. a pair of opposing lengthwise faces, a pair of opposing widthwise faces provided between the pair of lengthwise faces, a pair of upper outer flaps extending from upper edges of the pair of lengthwise faces, a pair of upper inner flaps extending from upper edges of the pair of widthwise faces, a pair of lower outer flaps extending from lower edges of the pair of lengthwise faces, and a pair of lower inner flaps extending from lower edges of the pair of widthwise faces, wherein the upper inner flap creases are curved lines that convex downward of the packaging box.

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