Packing box

Abstract

To provide a packaging box which can suppress occurrence of buckling at an unintended position.SOLUTION: A packaging box 1 includes a first ruled line L1 on a boundary line where plate parts 3a and 3b constituting a side plate 3, and flaps 4a and 4b for a top plate are connected to each other, and a second ruled line L2 provided in parallel below the first ruled line L1. The second ruled line L2 is provided over the whole circumference of the packaging box 1, and has a plurality of cut lines C on the second ruled line L2. The plate part 3b is provided with a hand hole part 6 adjacent to the first ruled line L1, and the cut lines C on the second ruled line L2 are arranged so as to be deviated from a position overlapping upper side cut lines 6d and 6e constituting the hand hole part 6 in a vertical direction.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a packaging box for storing drinking water bottles and the like. Regarding. [Background technology]

[0002] Conventionally, when a load is applied from above to a packaging box, the body portion of the box may bend, and therefore, measures have been taken to prevent damage to the packaging box itself and its contents.

[0003] For example, the cardboard box of Patent Document 1 has cut lines in the back liner at regular intervals near the height of each fold line between each side panel and each top flap, at positions 5 to 50 millimeters from the fold line.

[0004] If the body cannot withstand the long-term load and the side panels begin to flex, the side panels will buckle at the cut line, and the load will be directly applied to the contents (the container). This means that the entire compressive load is shared between the contents and the box, preventing the side panels from flexing. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-72044 Summary of the Invention [Problem to be solved by the invention]

[0006] Currently, drinking water containers are in use that are slightly deformable in the vertical direction. When such containers are placed in boxes with only folds (cut lines), buckling can occur at unintended positions that are not along the folds when a load is applied from above.

[0007] Instead of creating creases, it is possible to cut slits in the box, but even with these slits, it is difficult to solve the problem of buckling in unintended places.

[0008] The present invention has been made in view of the above circumstances, and has an object to provide a packaging box that can prevent buckling from occurring in unintended positions. [Means for solving the problem]

[0009] In this type of packaging box, hand holes are often provided near the upper ends of the side panels. Therefore, even if creases or cuts are added to the packaging box, when a load is applied from above, unintended buckling may occur around the hand holes rather than along the creases or cuts.

[0010] As a result of thorough research into this phenomenon, the inventor discovered that unintended buckling occurs in the slits that make up the hand hole and are adjacent to the top plate, leading to the invention of this invention.

[0011] In order to achieve the above object, the present invention provides a packaging box comprising a bottom plate, side plates erected upward from the bottom plate, and a top plate having a flap portion that closes a space formed by the side plates at an upper portion, a first fold line formed on a boundary line where the side panel and the flap portion are connected, and a second fold line provided below the first fold line of the side panel and parallel to the first fold line, The second fold line is provided along the entire periphery of the packaging box, and has a plurality of cut lines on the second fold line, The side panel is provided with a hand hole portion adjacent to the first fold line, and the hand hole portion is composed of a lower cut line extending horizontally of the packaging box, a pair of vertical cut lines extending upward from both ends of the lower cut line, a pair of upper cut lines extending horizontally from the upper ends of the vertical cut lines, and a fold line connecting the pair of upper cut lines, and the cut line on the second fold line is positioned so as to be offset from the position where it overlaps vertically with the upper cut line.

[0012] In the packaging box of the present invention, the flap portion is connected to the side panel at a first fold line and is folded at this portion to form the top panel. A second fold line is provided below the first fold line, parallel to the first fold line, and runs along the entire periphery of the packaging box. The second fold line has multiple score lines, making it easy to bend, so that when a load is applied from above the packaging box, it bends reliably at the second fold line.

[0013] The hand hole is made up of the lower cut line, the vertical cut line, the upper cut line, and the fold line, and when a user presses the hand hole from the outside of the packaging box, it bends at the fold lines to form a hole for the user's hand to fit in. Here, "extending horizontally" and "extending upward" include lines that extend at an angle.

[0014] In addition, the score line on the second fold line is offset from the position where it overlaps vertically with the upper score line, i.e., it is positioned so that they do not overlap vertically. Therefore, when a load is applied from above, unintentional bending at the upper score line is prevented, and the box can be reliably bent at the second fold line to absorb any bulging. This prevents the packaging box from buckling in an unintended position and causing a bulging box that would spoil its appearance.

[0015] In the packaging box of the present invention, it is preferable that the packaging box has a combined hand hole portion in which two hand hole portions are aligned in the horizontal direction and combined so that one of the vertical cutting lines forms a common vertical cutting line.

[0016] In the present invention, the packaging box can open a large combined hand hole by opening each of the two hand holes. Furthermore, the score lines on the second fold line are offset from the positions where they vertically overlap with the upper cut lines. This prevents unintended bending at the upper cut lines when a load is applied from above, and ensures that the box is bent at the second fold line to absorb any body bulge. This prevents the packaging box from buckling at an unintended position and causing body bulge, even when combined hand holes are provided, preventing the packaging box from spoiling its appearance. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a perspective view of a packaging box according to an embodiment of the present invention; [Figure 2] FIG. 1 is a development view of a packaging box according to an embodiment of the present invention. [Figure 3] 3 is an enlarged view of a region R of the packaging box in FIG. 2. [Figure 4] FIG. 1 is a diagram illustrating aspects of Experimental Examples 1 to 9 (9 types). [Figure 5] FIG. 1 is a diagram illustrating the results of a compression test in Experimental Example 1. [Figure 6] FIG. 10 is a diagram illustrating the results of compression tests for Experimental Examples 2 to 9 (8 types). DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, a packaging box according to an embodiment of the present invention will be described with reference to the drawings. In this embodiment, the direction of gravity is defined as downward, and the opposite direction is defined as upward. Furthermore, when the packaging box is placed with its bottom plate facing downward, the up-down direction is defined as the vertical direction, and the left-right direction is defined as the horizontal direction.

[0019] FIG. 1 shows a perspective view of a packaging box 1 of this embodiment.

[0020] The packaging box 1 is a rectangular box made of cardboard, thick paper, etc., which mainly contains drinking water bottles, and is composed of a bottom plate 2, side plates 3 erected upward from the bottom plate 2, and a top plate 4 which closes the space formed by the side plates 3 at the top.

[0021] Side plate 3 is composed of a surface (plate portion 3a) on which cutout pieces 5 are provided, and a surface (plate portion 3b) on which hand holes 6 are provided and which is narrower in the horizontal direction than plate portion 3a. Plate portions 3a and 3b are connected alternately, so that the two cutout pieces 5 are positioned opposite each other, and the two hand holes 6 are also positioned opposite each other.

[0022] FIG. 2 shows a development view of the packaging box 1.

[0023] The bottom plate 2 is composed of a bottom plate flap 2a and a bottom plate flap 2b. The bottom plate flaps 2a and 2b are connected to the plate portions 3a and 3b, respectively, via fold lines.

[0024] The top panel 4 is composed of a top panel flap 4a and a top panel flap 4b ("flap portion" of the present invention). The top panel flaps 4a and 4b are connected to the plate portions 3a and 3b, respectively, via fold lines. The fold lines coincide with the first ruled line L1 ("first fold line" of the present invention) in the developed view.

[0025] Second score lines L2 ("second fold lines" according to the present invention) are provided in parallel with the first score lines L1 on the side panels 3. In addition, multiple score lines C are provided on the second score lines L2 along the entire periphery of the packaging box 1. As will be described in detail later, when a load is applied from above, the packaging box 1 can be bent at the second score lines L2 due to the effect of the score lines C.

[0026] Lines M1 to M4 in the figure are fold lines for the side panel 3. Since the plate portion 3a having the line M1 is connected to the adhesive portion 3c, by bonding the adhesive portion 3c to the end of the plate portion 3b (the side opposite to the line M4), the side panel 3 becomes rectangular when viewed from above.

[0027] Plate portion 3a is provided with a cutout piece 5. If a break assist line is formed around the entire circumference of packaging box 1 at a position above cutout piece 5, cutout piece 5 and break assist line can be used to leave the lower part of packaging box 1 broken in the circumferential direction in the shape of a tray. Also, plate portion 3b is provided with hand holes 6, the structure of which will be described in detail later.

[0028] FIG. 3 is an enlarged view of a region R of the packaging box 1 in FIG.

[0029] As shown in the figure, hand hole 6 has a shape in which two holes, 6A and 6B, are arranged in the horizontal direction of packaging box 1. Holes 6A and 6B are each formed by cut lines 6a to 6e and a fold line 6f.

[0030] The lower cutting score line 6a is the lower edge extending horizontally of the packaging box 1. The vertical cutting score line 6b is a pair of vertical lines extending upward from both ends of the lower cutting score line 6a, and the vertical cutting score line 6c is a vertical line extending upward from the center of the lower cutting score line 6a.

[0031] Furthermore, the upper cutting score lines 6d are a pair of upper edges extending diagonally upward from the upper ends of the vertical cutting score lines 6b, and the upper cutting score line 6e is an upper edge extending diagonally downward (in both directions). The straight line connecting the upper cutting score lines 6d and 6e is the fold line 6f, and when a user presses the holes 6A and 6B from the outside of the packaging box 1, the box bends at the fold line 6f and is divided at the cutting score line 6c, allowing the user's hand to enter. The vertical cutting score line 6c is a vertical line common to the holes 6A and 6B (the "common vertical cutting line" of the present invention), and the upper cutting score line 6e is a curved line convex upward.

[0032] A first crease L1 and a second crease L2 are present above the hand hole 6. The first crease L1 is a fold line formed on the boundary line connecting the plate portion 3b and the top plate flap 4b. The second crease L2 is provided parallel to the first crease L1, with the distance between the two lines being approximately 5 to 15 mm.

[0033] The second crease L2 also has multiple score lines C1 to C4 (10 mm apart) spaced at regular intervals. When a load is applied from above to the packaging box 1, for example, if a beverage bottle contained therein is deformed, the packaging box 1 will bend with the second crease L2 acting as a new fold line. This prevents the packaging box 1 from buckling at an unintended position and causing a bulge that could spoil the box's appearance.

[0034] One factor that causes this bending is that the cut lines 6b to 6e that define the hand hole 6 are offset from the cut lines C1 to C4 so that they do not overlap in the vertical direction. Specifically, the upper cut line 6d of the hole 6A is located in the area between the cut lines C1 and C2, and the upper cut line 6d of the hole 6B is located in the area between the cut lines C3 and C4. Furthermore, the upper cut line 6e is located in the area between the cut lines C2 and C3. By positioning the cut lines C1 to C4 of the second score line L2 and the cut lines 6d, 6e of the hand hole 6 in this way, the strength of the packaging box 1 can be significantly improved.

[0035] Next, experimental examples 1 to 9 (9 types) in which actual compression tests were conducted will be described with reference to Figures 4 to 6. In each experimental example, the maximum strength and buckling (bending) state of the packaging box were confirmed.

[0036] 4 shows the aspects of Experimental Examples 1 to 9. The strips in the figure are added to make the position of the cut line C easier to see.

[0037] "Experimental Example 1" is the same as that described in Figure 3, but the side panel 3 has a first score line L1 and a second score line L2, and the second score line L2 has multiple score lines C. The multiple score lines C are also arranged at equal intervals, and the horizontal center and both ends of the hand hole portion 6 are arranged so that they do not overlap any of the score lines C in the vertical direction. "Experimental Example 1" is one embodiment of the present invention.

[0038] In "Experimental Example 2," the side panel 3 has a first score line L1 and a second score line L2, but the second score line L2 does not have a cut line C. The shape of the hand hole portion 6 is the same as in "Experimental Example 1." "Experimental Example 2" is a comparative example for comparing the effects with "Experimental Example 1."

[0039] In "Experimental Example 3," the side panel 3 has a first score line L1 and a second score line L2, but the second score line L2 does not have a cut line C. Unlike the hand hole portion 6 in "Experimental Example 1," the hand hole portion 7 has a generally elliptical shape that is long in the horizontal direction of the packaging box 1.

[0040] Hand hole portion 7 is composed of a lower cutting line extending horizontally on packaging box 1, a pair of vertical cutting lines extending upward from both ends of the lower cutting line, a pair of upper cutting lines extending horizontally from the upper ends of the vertical cutting lines, and a fold line connecting the pair of upper cutting lines. When a user presses hand hole portion 7 from the outside of packaging box 1, it bends along the fold lines, thereby functioning as a hand hole portion. "Experimental Example 3" is a comparative example for comparing the effects with "Experimental Example 1."

[0041] In "Experimental Example 4," a first score line L1 is present on the side panel 3. Although a second score line L2 is not present, multiple cut lines C are present at equal intervals in the same positions as in "Experimental Example 1." The shape of the hand hole portion 6 is the same as in "Experimental Example 1." "Experimental Example 4" is a comparative example for comparing the effects with "Experimental Example 1."

[0042] In "Experimental Example 5," a first score line L1 is present on the side panel 3. There is no second score line L2, but there are multiple cut lines C arranged at equal intervals in the same position as in "Experimental Example 1." The shape of the hand hole portion 7 is the same as in "Experimental Example 3." "Experimental Example 5" is a comparative example for comparing the effects with "Experimental Example 1."

[0043] In "Experimental Example 6," a first score line L1 and a second score line L2 are present on the side panel 3, and the second score line L2 has multiple score lines C. The score lines C are also arranged at equal intervals, and the horizontal center and both ends of the hand hole portion 7 are arranged so that they do not overlap any of the score lines C in the vertical direction. "Experimental Example 6" is one embodiment of the present invention.

[0044] In "Experimental Example 7," a first score line L1 and a second score line L2 exist on the side panel 3, and the second score line L2 has multiple score lines C. Here, the horizontal center and both ends of the hand hole portion 6 are positioned so as to overlap vertically with one of the score lines C, i.e., on the same straight line. In addition, both ends of the hand hole portion 6 are also positioned so as to overlap vertically with another score line C. "Experimental Example 7" is a comparative example for comparing the effects with "Experimental Example 1."

[0045] In "Experimental Example 8," a first score line L1 and a second score line L2 exist on the side panel 3, and the second score line L2 has multiple score lines C. The horizontal center of the hand hole portion 7 does not overlap any of the score lines C in the vertical direction, but both ends are positioned so as to overlap vertically with the score lines C, i.e., on the same straight line. "Experimental Example 8" is a comparative example for comparing the effects with "Experimental Example 1."

[0046] Finally, in "Experimental Example 9," the side panel 3 has a first score line L1 and a second score line L2, and the second score line L2 has multiple score lines C. Here, the entire hand hole 6 is positioned so that it does not overlap any of the score lines C in the vertical direction. Specifically, this is an embodiment of "Experimental Example 1" in which the two central score lines C have been removed. "Experimental Example 9" is one embodiment of the present invention.

[0047] 5 shows the results of the compression test of "Experimental Example 1." In the compression test, the packaging box 1 was compressed from above until it buckled (bent), and its strength was measured.

[0048] The maximum strength of the packaging box 1 in "Experimental Example 1" was 509 kgf, and the effect of the double score lines (first score line L1 and second score line L2) was extremely good. This is thought to be because the load was distributed by arranging the multiple score lines C on the second score line L2 so that they were not aligned with the upper score lines 6d and 6e of the hand hole 6. Furthermore, as shown in the "Appearance during testing" in the figure, the packaging box 1 bent at the second score line L2, with almost no bulging, and the aesthetic appearance of the packaging box was maintained.

[0049] Next, the results of the compression test for Experimental Examples 2 to 9 (8 types) are shown in Figure 6. The compression test method was the same as in "Experimental Example 1."

[0050] In both "Experimental Examples 2" and "Experimental Examples 3," the second score lines L2 did not have score lines C. In these cases, the maximum strength was 330 [Kgf] and 265 [Kgf], respectively, which was lower than in "Experimental Example 1." In fact, a portion of the second score lines L2 buckled, and it was found that the effect of the double score lines was difficult to achieve without score lines C.

[0051] In "Experimental Example 4" and "Experimental Example 5," there was no second score line L2, and only multiple score lines C were present. In these cases, the maximum strength was 395 [Kgf] and 279 [Kgf], respectively, which was also lower than in "Experimental Example 1." In these cases, buckling occurred below the first score line L1, but the effect was small.

[0052] "Experimental Example 6" differs from "Experimental Example 1" only in that it uses hand holes 7, but it achieved a maximum strength of 451 kgf, the second highest among the nine experimental examples. This result shows that the effect of the double ruling is exerted regardless of the shape of the hand holes.

[0053] In both "Experimental Example 7" and "Experimental Example 8," the second score line L2 has multiple score lines C, and the score lines of hand holes 6 and 7 are aligned on the same straight line as the score lines C. In these cases, the maximum strengths were 255 [Kgf] and 233 [Kgf], respectively, which was only about 50% of the strength of "Experimental Example 1."

[0054] In this case, buckling occurred at an early stage, but the load was not distributed well, and the strain was absorbed in hand hole 6 or hand hole 7, which is thought to be the cause of the reduced strength. From these results, it was found that if the cut line of hand hole 6 or hand hole 7 and the cut line C of second score line L2 are aligned on the same straight line, the effectiveness of the double score is significantly reduced.

[0055] Finally, "Experimental Example 9" is an embodiment in which some of the score lines C are removed from the second score lines L2 of "Experimental Example 1." In this case, the maximum strength was 411 kgf, the third highest strength among the nine experimental examples. This result shows that the effectiveness of the double score lines is improved when score lines C are positioned to avoid the score lines of hand hole 6 or hand hole 7. From the above, it was found that the packaging box 1 of "Experimental Example 1" in particular has the greatest effect of the double score lines, and can reliably generate bending at the second score lines L2 when a load is applied from above the packaging box 1.

[0056] The present invention is not limited to the above-described embodiments and modifications, and can be embodied in various forms without departing from the spirit of the present invention. The shape of the hand holes is not limited to the above-described hand holes 6 and 7, and may be circular, polygonal, or other shapes. The length of the score lines C on the second score line L2 can be changed as appropriate, but bending of the second score line L2 is more likely to occur if the intervals between the score lines C are equal.

[0057] The packaging box of the present invention absorbs compressive loads in the vertical direction, and is therefore suitable for storing drinking water bottles that are slightly elastically deformable in the vertical direction. [Explanation of symbols]

[0058] 1...packaging box, 2...bottom plate, 2a, 2b...bottom plate flaps, 3...side plates, 3a, 3b...plate portion, 3c...glue portion, 4...top plate, 4a, 4b...top plate flaps, 5...cutout pieces, 6, 7...hand hole portion, 6A, 6B...hole portion, 6a to 6e...cut lines, 6f...fold lines, C, C1 to C4...cut lines, L1...first ruled line, L2...second ruled line, M1 to M4...rules.

Claims

1. A packaging box comprising a bottom plate, side plates erected upward from the bottom plate, and a top plate made of a flap portion that closes a space formed by the side plates at an upper portion, a first fold line formed on a boundary line where the side panel and the flap portion are connected; a second fold line provided below the first fold line of the side plate and parallel to the first fold line; Equipped with The second fold line is provided along the entire periphery of the packaging box, and has a plurality of cut lines on the second fold line, The side plate is provided with a hand hole adjacent to the first fold line, The hand hole portion is composed of a lower cut line extending along the horizontal direction of the packaging box, a pair of vertical cut lines extending upward from both ends of the lower cut line, a pair of upper cut lines extending along the horizontal direction from each upper end of the vertical cut line, and a fold line connecting the pair of upper cut lines, The packaging box is characterized in that the score line on the second fold line is arranged so as to be offset from a position where it overlaps vertically with the upper score line.

2. The packaging box according to claim 1, The packaging box is characterized in that it has a combined hand hole portion in which two hand hole portions are arranged in the horizontal direction and combined with one of the vertical cutting lines being a common vertical cutting line.

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