Packing box

Abstract

To provide a packaging box from which contents can be easily taken out while maintaining strength.SOLUTION: A side plate 2a of a packaging box 1 has a folding curve L3 that extends from the upper end of a folding curve L1 to an arbitrary point P on the folding curve L2. The folding curve L2 is formed with an oblique break line T that extends from the upper end thereof to the arbitrary point P. An in-ceiling flap 4a of the top surface section 4 is shaped to be bendable in such a manner of not exceeding the folding curve L3 when the in-ceiling flap 4a is folded and stacked on the outside of the packaging box 1 along a folding curve N1.SELECTED DRAWING: Figure 4

Description

Technical Field

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[0001] The present invention relates to a packaging box constituted by assembling cardboard or the like.

Background Art

[0002] Currently, there is known a packaging box that can open an outlet above the packaging box and then further separate a part of the side plate to expand the outlet so that the contents can be easily taken out.

[0003] For example, in the box (carton) described in Patent Document 1, a folding line extending obliquely from one end of a ridge line (folding line) formed at the folding position between the side panel and the top panel toward the substantially central portion in the longitudinal direction of the folding edge of the top panel is formed on the top panel. Thereby, this carton enables partial outward folding of the top panel.

[0004] When a consumer or the like opens the carton, first, the adhesion between the outer flap and the inner flap on the end side where the display portion is printed is peeled off to form an opening. Next, the adhesion between the end of the outer flap side of the top panel and the end panel is peeled off, and the top panel is obliquely folded outward (in the A direction) through the folding line. As a result, the top surface of the multi-pack (contents) is partially exposed, and a consumer or the like can easily take it out by putting a finger into the finger hole of the multi-pack (see Patent Document 1 / paragraphs 0012, 0013, FIGS. 1, 2).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] Furthermore, there are known packaging boxes in which the contents are removed by repeatedly folding and peeling back the side panels from the top of the box to open it. However, because it is necessary to create break lines in two places on the side panels, there was a risk that the strength of the packaging box would be reduced.

[0008] This invention has been made in view of these circumstances, and aims to provide a packaging box that allows for easy removal of its contents while maintaining its strength. [Means for solving the problem]

[0009] To achieve the above objective, the first invention is a packaging box comprising a side portion that forms a peripheral wall with a plurality of side plates, a top portion that is planar with a plurality of flaps connected to one end of the side portion, and a bottom portion that is planar with a plurality of flaps connected to the other end of the side portion, The first side plate has a third fold curve that is inclined with respect to the second fold curve, extending from the upper end of the first fold curve between the first side plate and the adjacent second side plate to an arbitrary point on the second fold curve between the first side plate and the adjacent third side plate on the opposite side of the second side plate, and the second fold curve is provided with a break line that extends from the upper end to the arbitrary point. The first flap on the top surface adjacent to the first side panel is characterized in that it has a shape that allows it to be folded so as not to exceed the third fold line when the first flap is folded back and overlapped to the outside of the packaging box along a fourth fold line between it and the first side panel.

[0010] The present invention relates to a packaging box comprising a side section, a top section, and a bottom section, which can store items inside. In this packaging box, the first side panel constituting the side section has a third fold line extending from the upper end of the first fold line to an arbitrary point on the second fold line, and the second fold line has a break line from its upper end to the aforementioned arbitrary point. Therefore, a part of the first side panel can be cut along the break line and folded along the third fold line to expand the opening.

[0011] Furthermore, the first flap, which constitutes the top surface, has a shape that allows it to be folded so as not to exceed the third fold line when folded back and overlapped with the outside of the packaging box along the fourth fold line. Since the first flap and the first side panel can be folded along the third fold line, the contents can be easily removed. In addition, since only the part between the side panels along the break line breaks, the strength of the packaging box is maintained at a high level.

[0012] To achieve the above objective, the second invention is a packaging box comprising a side portion that forms a peripheral wall with a plurality of side plates, a top portion that is planar with a plurality of flaps connected to one end of the side portion, and a bottom portion that is planar with a plurality of flaps connected to the other end of the side portion, The first side plate extends from a first arbitrary point on the first bend curve between the first side plate and the adjacent second side plate to a second arbitrary point on the second bend curve between the first side plate and the adjacent third side plate on the opposite side of the second side plate, and has a third bend curve that is inclined with respect to the second bend curve. The first fold line is provided with a first break line extending from the upper end to a first arbitrary point, and the second fold line is provided with a second break line that is longer than the first break line and extends from the upper end to a second arbitrary point. The first flap on the top surface adjacent to the first side panel is characterized in that it has a shape that allows it to be folded so as not to exceed the third fold line when the first flap is folded back and overlapped to the outside of the packaging box along a fourth fold line between it and the first side panel.

[0013] In the packaging box of the present invention, the first side panel constituting the side portion has a third fold line extending from a first arbitrary point on the first fold line to a second arbitrary point on the second fold line. Furthermore, the first and second fold lines are provided with break lines extending from their upper ends to arbitrary points, but since the break line on the second fold line is longer than the break line on the first fold line, the third fold line is inclined with respect to the second fold line. Therefore, a portion of the first side panel can be cut along both break lines and folded along the third fold line to expand the dispensing opening.

[0014] Furthermore, the first flap that constitutes the top surface has a shape that allows it to be folded so as not to exceed the third fold when folded back and overlapped with the outside of the packaging box along the fourth fold line. Since the first flap and the first side panel can be folded along the third fold line, the strength of the packaging box is maintained at a high level while the contents can be easily removed.

[0015] In the packaging box of the present invention, it is preferable that the first flap is folded once or multiple times along the fold line on the first flap, and then folded back to the outside of the packaging box along the fourth fold line and overlapped, so as not to exceed the third fold line.

[0016] The first flap can be, for example, folded once along the fold line on the first flap, and then folded back to the outside of the packaging box along the fourth fold line and overlapped, and its shape does not exceed the third fold line (e.g., rectangular). This allows the packaging box not to be limited to the shape of the first flap, and the opening can be expanded.

[0017] Furthermore, in the packaging box of the present invention, it is preferable that the first flap has a polygonal shape with a hypotenuse that overlaps with the third fold curve when the first flap is folded back to the outside of the packaging box along the fourth fold curve and overlapped.

[0018] The first flap has a polygonal shape. When the first flap and the first side plate are bent along the third fold line, the third fold line and the hypotenuse overlap. Therefore, the first side plate can be easily bent with the hypotenuse as a fulcrum.

Brief Description of the Drawings

[0019] [Figure 1] It is a perspective view of the packaging box (in a sealed state). [Figure 2] It is a plan view of the corrugated cardboard of the packaging box of the first embodiment. [Figure 3] It is a view showing the state where the top surface portion of the packaging box is opened. [Figure 4] It is a view showing the state where the side plate of the packaging box is broken along the broken line. [Figure 5] It is a view showing the state where the side plate of the packaging box is bent along the fold line. [Figure 6] It is a view showing how to take out the contents from the packaging box. [Figure 7] It is a plan view of the corrugated cardboard of the packaging box of the first embodiment (modified example). [Figure 8] It is a plan view of the corrugated cardboard of the packaging box of the second embodiment. [Figure 9] It is a view showing the state where the side plate of the packaging box is bent along the fold line.

Modes for Carrying Out the Invention

[0020] Hereinafter, with reference to the drawings, a packaging box according to an embodiment of the present invention will be described.

[0021] [First Embodiment] FIG. 1 is a perspective view of a type-A corrugated box (in a sealed state) according to the first embodiment of the packaging box 1, and an object can be stored inside. The packaging box 1 includes four side surface portions 2 that constitute the peripheral wall, a planar top surface portion 4, and a planar bottom surface portion 6.

[0022] As will be explained in more detail later, a break line T (perforation) is provided on the fold line L2 between the side plates 2a and 2b that make up the side section 2, allowing them to be separated. In addition, a diagonal fold line L3 is provided on the side plate 2a, so the upper part of the side plate 2a can be folded outwards along the fold line L3 to the outside of the packaging box 1.

[0023] Figure 2 shows the corrugated cardboard sheet 1x in its pre-assembly state for packaging box 1. Packaging box 1 is a packaging box that is assembled by folding the corrugated cardboard sheet 1x shown in the figure. The details of the corrugated cardboard sheet 1x are described below.

[0024] The corrugated cardboard sheet 1x includes side panels 2a to 2d and a stopper 2e that constitute the side portion 2, top inner flaps 4a, 4c and top outer flaps 4b, 4d that constitute the top portion 4, and bottom inner flaps 6a, 6c and bottom outer flaps 6b, 6d that constitute the bottom portion 6.

[0025] The side plate 2a (the "first side plate" of the present invention), which forms part of the peripheral wall, is connected to the top flap 4a of the top surface 4 via a folding curve N1 (the "fourth folding curve" of the present invention), and to the bottom flap 6a of the bottom surface 6 via a folding curve N2. These folding curves N1 and N2 are lines that facilitate the folding of the corrugated cardboard 1x, and this is also true for the other folding curves described later. The size of the side plate 2a in the left-right direction is slightly smaller than that of the side plates 2b and 2d described later (side plates 2a and 2c are the short sides).

[0026] The right end of side plate 2a is connected to side plate 2d (the "second side plate" of the present invention) via a folding curve L1 (the "first folding curve" of the present invention). The left end of side plate 2a is connected to side plate 2b via a folding curve L2 (the "second folding curve" of the present invention). Furthermore, side plate 2a extends from the upper end of folding curve L1 to an arbitrary point P on folding curve L2, and is provided with a fold line L3 (the "third folding curve" of the present invention) that is inclined with respect to folding curves L1 and L2.

[0027] A break line T is provided on the folding curve L2, allowing one end of the side plate 2a to be separated along the break line T. Preferably, the break line T extends from the upper end of the folding curve L2 to a position less than halfway along the folding curve L2. This allows the upper portion of the side plate 2a to be folded along the fold line L3.

[0028] The inner top flap 4a (the "first flap" of the present invention) is one of a pair of inner flaps that constitute the top surface 4. The left end of the inner top flap 4a is connected to the outer top flap 4b via a slit S2. The right end of the inner top flap 4a is connected to the outer top flap 4d via a slit S1.

[0029] The inner top flap 4a has a trapezoidal shape with its upper edge parallel to the fold line N1 and a hypotenuse H that coincides with the fold line L3 when folded outwards. Therefore, the slit S1 between the inner top flap 4a and the outer top flap 4d is triangular in shape as shown in the figure.

[0030] The top inner flap 4a only needs to have a shape that does not exceed the fold line L3 when folded back and overlapped to the outside of the packaging box 1 along the fold line N1. If the top inner flap 4a has such a shape, when the side plate 2a is cut along the break line T and folded along the fold line L3, the top inner flap 4a will not come into contact with the remaining unfolded portion of the side plate 2a, making it easier to open the packaging box 1.

[0031] The bottom inner flap 6a is one of a pair of inner flaps that make up the bottom portion 6. The left end of the bottom inner flap 6a is connected to the bottom outer flap 6b via a slit S5. The right end of the bottom inner flap 6a is also connected to the bottom outer flap 6b via a slit S4.

[0032] The side panel 2b (the "third side panel" of the present invention) is a long side panel, to which the top outer flap 4b is connected via a folding curve N1, and to which the bottom outer flap 6b is connected via a folding curve N2. The right end of the side panel 2b is connected to the side panel 2c via a folding curve L4.

[0033] The top outer flap 4b is one of a pair of outer flaps that make up the top surface 4. The left end of the top outer flap 4b is connected to the top inner flap 4c via a slit S3. The bottom outer flap 6b is one of a pair of outer flaps that make up the bottom surface 6. The left end of the bottom outer flap 6b is connected to the bottom inner flap 6c via a slit S6.

[0034] The side panel 2c is connected to the top inner flap 4c via a fold curve N1, and to the bottom inner flap 6c via a fold curve N2. The top inner flap 4c is one of a pair of inner flaps that make up the top section 4. The bottom inner flap 6c is one of a pair of inner flaps that make up the bottom section 6.

[0035] The side panel 2d is connected to the top outer flap 4d via a fold curve N1, and to the bottom outer flap 6d via a fold curve N2. The top outer flap 4d is one of a pair of outer flaps that make up the top section 4. The bottom outer flap 6d is one of a pair of outer flaps that make up the bottom section 6.

[0036] A stopper 2e is attached to the right end of the side panel 2d via a fold line L5. The position to which the stopper 2e is attached can be changed depending on the configuration of the corrugated cardboard 1x. That is, the stopper 2e only needs to be attached to the end of one of the combinations of side panels 2a to 2d located at both ends when the packaging box 1 is unfolded.

[0037] Next, the procedure for opening packaging box 1 will be explained with reference to Figures 3 to 6. Note that smaller boxes 10 and 11 are stored inside packaging box 1.

[0038] Figure 3 shows the top surface 4 of the packaging box 1 opened. The worker peels off the tape connecting the outer top flap 4b and outer top flap 4d, and opens the outer top flaps 4b and 4d. Then, the inner top flaps 4a and 4c are opened. If the small boxes 10 and 11 are packed tightly inside the packaging box 1, it can be said that the small boxes 10 and 11 are difficult to remove.

[0039] Figure 4 shows the state in which the side panel 2a of the packaging box 1 has been broken along the break line T. As shown in the figure, the worker folds the top inner flap 4a outwards from the packaging box 1, then grasps the upper part of the side panel 2a and slowly cuts the side panel 2a along the break line T.

[0040] Figure 5 shows the side panel 2a of the packaging box 1 folded along the fold line L3.

[0041] The worker holds the corner (the side that has been broken) of the side panel 2a and folds the side panel 2a outwards towards the packaging box 1 along the fold line L3. Here, the hypotenuse H of the inner top flap 4a coincides with the fold line L3, so the hypotenuse H acts as a fulcrum, making it easy to fold the side panel 2a. Also, the inner top flap 4a (dashed line) coincides with the side panel 2a and does not come into contact with the remaining unfolded portion of the side panel 2a, making it easy to fold.

[0042] Figure 6 shows the process of removing the contents from packaging box 1.

[0043] As shown in the illustration, the packaging box 1 has a large opening. Therefore, the worker can easily remove the small box 10 by placing their fingers on the side of the folded side panel 2a, which holds the small box 10 in the upper part, and by inserting their fingers into the gap between the side panel 2c, which is opposite to side panel 2a, and the packaging box 1.

[0044] Since the break line T extends to the bottom of the folding curve L2, the worker can see the small box 11 placed on the underside of the packaging box 1. In other words, the worker can also remove the small box 11 by placing their fingers on the folded side panel 2a and by inserting their fingers into the gap between the side panel 2c and the packaging box 1.

[0045] As described above, the packaging box 1 according to the first embodiment has the aforementioned break line T and fold line L3 on one of its side panels (side panel 2a). When opened, the top flap 4a of the top surface 4 and the side panel 2a are overlapped and folded, and then broken, thereby enlarging the opening. As a result, the worker can easily remove the contents. Furthermore, since only the portion between side panel 2a and side panel 2b along the break line T is broken, the strength of the packaging box is maintained at a high level.

[0046] The top inner flap 4a should have a shape (polygonal shape) that does not exceed the fold line L3 when folded outwards from the packaging box 1 and overlapped with the side panel 2a. In this case, if both ends (or a portion thereof) of the hypotenuse H of the top inner flap 4a overlap with the fold line L3, the overlapping point will act as support, making it easier to fold.

[0047] Figure 7 shows the corrugated cardboard sheet 1y of the packaging box 1' (modified version) before assembly.

[0048] As shown in the figure, the inner top flap 4a' of the corrugated cardboard sheet 1y is rectangular in shape, with its top edge parallel to the fold line N1. The inner top flap 4a' has a diagonal fold line L6 extending from the end of the side perpendicular to the top edge (on the side of the fold line N1) along the slit S1 to the top edge.

[0049] The inner top flap 4a' is folded back to the outside of the packaging box 1' along the fold line L6, and then folded back to the outside of the packaging box 1' along the fold line N1 and overlapped so that the fold lines L3 and L6 overlap. When expanding the dispensing opening of the packaging box 1', first the side plate 2a is cut along the break line T, and then the inner top flap 4a' is folded twice so that the fold lines L3 and L6 overlap. Since the inner top flap 4a' does not come into contact with the remaining unfolded portion of the side plate 2a, the packaging box 1' becomes easier to open.

[0050] The top inner flap 4a' can be folded once or multiple times, and when the top inner flap 4a' is folded back along the fold line N1 and overlapped with the outside of the packaging box 1, it only needs to have a shape that does not exceed the fold line L3 of the side plate 2a, and is not limited to a rectangular shape.

[0051] [Second Embodiment] Next, the packaging box 20 according to the second embodiment will be described with reference to Figures 8 and 9. Note that components identical to those in the packaging box 1 of the first embodiment are denoted by the same reference numerals, and some descriptions are omitted.

[0052] Figure 8 shows the corrugated cardboard 20x in its pre-assembly state for the packaging box 20. The packaging box 20 is assembled by folding the corrugated cardboard 20x shown in the figure. The details of the corrugated cardboard 20x are described below.

[0053] The corrugated cardboard sheet 20x includes side panels 2b, 2c, 2d, 2f and a stopper 2e that constitute the side portion 2, top inner flaps 4f, 4c and top outer flaps 4b, 4d that constitute the top portion 4, and bottom inner flaps 6a, 6c and bottom outer flaps 6b, 6d that constitute the bottom portion 6.

[0054] The side plate 2f (the "first side plate" of the present invention), which forms part of the peripheral wall, is connected to the top surface inner flap 4f of the top surface portion 4 via a folding curve N1 (the "fourth folding curve" of the present invention), and to the bottom surface inner flap 6a of the bottom surface portion 6 via a folding curve N2.

[0055] The right end of side plate 2f is connected to side plate 2d (the "second side plate" of the present invention) via a folding curve L1 (the "first folding curve" of the present invention). The left end of side plate 2f is connected to side plate 2b via a folding curve L2 (the "second folding curve" of the present invention). Side plate 2f extends from an arbitrary point Pa (the "first arbitrary point" of the present invention) on folding curve L1 (excluding the upper end) to an arbitrary point Pb (the "second arbitrary point" of the present invention) on folding curve L1, and has a fold line L3' (the "third folding curve" of the present invention) that is inclined with respect to folding curves L1 and L2.

[0056] A break line T1 is provided on the folding curve L1, extending from the upper end of the folding curve L1 to an arbitrary point Pa, allowing the side plate 2f to be separated along the break line T1. The length of the break line T1 is equal to the length of the short side I adjacent to the outer flap 4d of the inner flap 4f.

[0057] Furthermore, a break line T2 is provided on the fold line L2, extending from the upper end of the fold line L2 to an arbitrary point Pb, allowing the side plate 2f to be separated along the break line T2. Preferably, the break line T2 extends from the upper end of the fold line L2 to a position less than halfway along the fold line L2. Also, by making the break line T2 longer than the break line T1, the fold line L3' is inclined with respect to the fold lines L1 and L2. As a result, the upper portion of the side plate 2f can be folded along the fold line L3'.

[0058] Furthermore, it is preferable that the break line T1 be less than half the length of the fold line L2. This is because if both the break lines T1 and T2 are longer than half the length of the fold lines L1 and L2, the strength of the packaging box 20 may decrease.

[0059] The inner top flap 4f (the "first flap" of the present invention) is one of a pair of inner flaps that constitute the top surface 4. As shown in the figure, the inner top flap 4f has a pentagonal shape in which the top edge and the fold line N1 are parallel, and the hypotenuse H overlaps with the fold line L3' when folded outwards. Therefore, the slit S1 between the inner top flap 4f and the outer top flap 4d is triangular in shape as shown in the figure.

[0060] Figure 9 shows the side panel 2f of the packaging box 20 folded along the fold line L3'.

[0061] As shown in the diagram, the worker folds the top inner flap 4f outwards from the packaging box 20, then grasps the upper part of the side panel 2f and slowly separates the side panel 2f along the break lines T1 and T2.

[0062] Next, the worker holds the side panel 2f and folds it outwards from the packaging box 20 along the fold line L3'. Here, the hypotenuse H of the top inner flap 4f coincides with the fold line L3', so the hypotenuse H acts as a fulcrum, making it easy to fold the side panel 2f. Also, the top inner flap 4f (dashed line) coincides with the side panel 2f and does not come into contact with the remaining unfolded portion of the side panel 2f, making it easy to fold.

[0063] Thus, the packaging box 20 has a larger opening for removing contents compared to the packaging box 1 of the first embodiment. Therefore, the worker can easily remove the small box 10 by placing their fingers on the side of the small box 10, which is placed on top, from the side of the folded side panel 2f, and by placing their fingers in the gap between the small box 10 and the packaging box 20 on the side of the side panel 2c opposite to the side panel 2f. Similarly, the worker can remove the small box 11 by placing their fingers on the small box 11 from the side of the folded side panel 2f, and by placing their fingers in the gap between the small box 11 and the packaging box 1 on the side of the side panel 2c opposite to the side panel 2f.

[0064] Similar to the first embodiment, the top inner flap 4f only needs to have a shape (polygonal shape) that does not exceed the fold line L3' when the top inner flap 4f is folded outwards from the packaging box 20 and overlapped with the side plate 2f. In this case, if both ends (or a portion thereof) of the hypotenuse H of the top inner flap 4f overlap with the fold line L3', the overlapping point acts as support, making it easier to fold. Then, when opening, the top inner flap 4f and the side plate 2f are overlapped, folded, and torn, thereby increasing the opening for removal. As a result, the worker can easily remove the contents.

[0065] Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and can be implemented in various forms without departing from the spirit of the invention. For example, in Figure 2, the break line T and the fold line L3 may be provided on the long side plates 2b and 2d. Alternatively, the inner flap 4f on the top surface of the packaging box 20 may be made into a rectangular shape with a fold line at the position of the hypotenuse H (see Figure 8), and folded twice so that the fold line L3' and the fold line at the position of the hypotenuse H overlap. [Explanation of symbols]

[0066] 1,1',20…Packaging box, 1x,20x…Corrugated cardboard, 2…Side section, 2a~2d,2f…Side panel, 2e…Sealing edge, 4…Top section, 4a,4a',4c,4f…Inner top flap, 4b,4d…Outer top flap, 6…Bottom section, 6a,6c…Inner bottom flap, 6b,6d…Outer bottom flap, H…Hypotent side, I…Short side, L1~L6,L3',N1,N2…Fold curve, P,Pa,Pb…Arbitrary point, S1~S6…Slit, T,T1,T2…Break line.

Claims

1. A packaging box comprising a side section that forms a peripheral wall with multiple side plates, a top section that is flat due to multiple flaps connected to one end of the side section, and a bottom section that is flat due to multiple flaps connected to the other end of the side section, The first side plate extends from the upper end of the first bend curve between the first side plate and the adjacent second side plate to an arbitrary point on the second bend curve between the first side plate and the adjacent third side plate on the opposite side of the second side plate, and has a third bend curve that is inclined with respect to the second bend curve. The second fold line is provided with a break line extending from the upper end to the arbitrary point. A packaging box characterized in that the first flap on the top surface adjacent to the first side panel has a shape that allows it to be folded so as not to exceed the third fold line when the first flap is folded back and overlapped to the outside of the packaging box along a fourth fold line between it and the first side panel.

2. A packaging box comprising a side section that forms a peripheral wall with multiple side plates, a top section that is flat due to multiple flaps connected to one end of the side section, and a bottom section that is flat due to multiple flaps connected to the other end of the side section, The first side plate extends from a first arbitrary point on the first bend curve between the first side plate and the adjacent second side plate to a second arbitrary point on the second bend curve between the first side plate and the adjacent third side plate on the opposite side of the second side plate, and has a third bend curve that is inclined with respect to the second bend curve. The first fold line is provided with a first break line extending from the upper end to the first arbitrary point. The second break line extends from the upper end to the second arbitrary point, and is provided with a second break line that is longer than the first break line. A packaging box characterized in that the first flap on the top surface adjacent to the first side panel has a shape that allows it to be folded so as not to exceed the third fold line when the first flap is folded back and overlapped to the outside of the packaging box along a fourth fold line between it and the first side panel.

3. In the packaging box according to claim 1 or 2, A packaging box in which the first flap is folded once or multiple times along the fold line on the first flap, and when the first flap is further folded back to the outside of the packaging box along the fourth fold line and overlapped, the shape does not exceed the third fold line.

4. In the packaging box according to claim 1 or 2, A packaging box in which the first flap is a polygonal shape having a hypotenuse that overlaps with the third fold curve when the first flap is folded back to the outside of the packaging box along the fourth fold curve and overlapped.

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