JP7757875B2 - packaging box - Google Patents

Description

The present invention relates to a packaging box.

When food items such as vegetables and fruits are placed in a cardboard packaging box, water generated from the food items and ice packs may accumulate on the inner surface of the bottom plate, causing the water to penetrate the bottom plate.
Therefore, some conventional packaging boxes have holes formed in the lower corners of the box body and creases formed on the inner surface of the bottom plate that extend from the holes toward the center of the bottom plate (see, for example, Patent Document 1). With this configuration, water on the inner surface of the bottom plate flows along the creases toward the holes and is drained to the outside through the holes.

Utility Model Registration No. 3236097

In the conventional packaging boxes described above, the bottom plate is prone to bending at the creases, making it susceptible to deformation due to the weight of the contents. Furthermore, in order to improve drainage efficiency in the conventional packaging boxes described above, it is necessary to form multiple creases on the inner surface of the bottom plate. As such, the conventional packaging boxes described above have the problem of reduced bottom plate strength.

The objective of the present invention is to solve the above-mentioned problems and provide a packaging box that can improve drainage efficiency while maintaining the strength of the bottom plate.

To solve the above-mentioned problems, the present invention provides a packaging box comprising a box body having a cylindrical body with front and rear end walls and left and right side walls, and a bottom plate provided at an opening on the lower side of the body, with holes formed in the lower corners of the box body. A depression formed by crushing is formed on the inner edge of the bottom plate, and the depression extends from the hole along the edge of the bottom plate. In a direction intersecting the extension direction of the depression, the upper surface of the depression is inclined so that the outer side of the bottom plate is lower than the center side.

In the packaging box of the present invention, if the bottom plate is tilted during transportation, water accumulated on the inner surface of the bottom plate flows into the recess. The water flows inside the recess toward the hole and is drained to the outside through the hole.
Furthermore, in the packaging box of the present invention, the drainage efficiency is improved by the recesses formed by crushing the inner edge of the bottom plate, so that the strength of the bottom plate can be maintained.

In the packaging box described above, the upper surface of the recessed portion is inclined so that the outer side is lower than the center side of the bottom plate, so that water is less likely to remain in the recessed portion.

In the packaging box described above, the bottom plate may include an inner flap connected to the lower edge of the end wall and an outer flap connected to the lower edge of the side wall, with the outer flap overlapping the outer surface of the inner flap. In this case, by forming the recesses on at least the left and right edges of the inner flap, drainage efficiency can be improved in a packaging box having a bottom plate formed by overlapping inner and outer flaps.

In the packaging box of the present invention, depressions formed by crushing the inner edge of the bottom plate make it easier for water inside the box to drain out through holes in the box, thereby improving drainage efficiency while maintaining the strength of the bottom plate.

1 is a perspective view of a packaging box according to a first embodiment of the present invention, viewed from the front lower left. FIG. 1 is a diagram showing a blank sheet for a packaging box according to a first embodiment of the present invention. FIG. 3 is a cross-sectional view of the packaging box according to the first embodiment of the present invention taken along line III-III in FIG. 1. FIG. 1 is an explanatory diagram showing an embodiment in which recesses are formed on the left and right edge portions of the inner flap of the packaging box according to the first embodiment of the present invention. FIG. FIG. 10 is a diagram showing a blank sheet for a packaging box according to a second embodiment of the present invention. FIG. 10 is a cross-sectional view showing the bottom plate of a packaging box according to a second embodiment of the present invention.

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 description of each embodiment, the same components are denoted by the same reference numerals, and duplicated descriptions will be omitted.
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.

[First embodiment]
1, the packaging box 1A of the first embodiment includes a box body 50 having a rectangular cylindrical body 10, a bottom plate 20 closing the lower opening of the body 10, and a top plate 30 closing the upper opening of the body 10. The packaging box 1A of the first embodiment is an A-type cardboard box.

As shown in Figure 2, the packaging box 1A of the first embodiment is formed by mountain or valley folding a blank sheet S1 cut out from a cardboard sheet at each fold line. The blank sheet S1 shown in Figure 2 is positioned so that the inner surface is visible.

The fold lines of the blank sheet S1 are creases (pressed creases) formed by linearly pressing the surface of the blank sheet S1. Note that the fold lines may also be formed with intermittent notches, which makes it easier to fold the blank sheet S1 at the fold lines.
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.

As shown in FIG. 1, the body 10 comprises a pair of front and rear end walls 11, 11 and a pair of left and right side walls 12, 12. The end wall 11 and side wall 12 are formed in a rectangular shape. The end wall 11 and side wall 12 are connected via a folding line. In this embodiment, the cylindrical body 10 is formed by attaching a joining piece 13 connected to the rear edge of the left side wall 12 to the inner surface of the rear end wall 11. Rectangular openings are formed on the top and bottom surfaces of the body 10.

The bottom plate 20 has a pair of front and rear inner flaps 21, 21 connected to the front and rear end walls 11, 11, respectively, and a pair of left and right outer flaps 22, 22 connected to the left and right side walls 12, 12, respectively.

The inner flaps 21 are connected to the lower edge of the end wall 11 via a fold line. The front inner flap 21 covers the front of the opening on the lower side of the body 10, and the rear inner flap 21 covers the rear of the opening on the lower side of the body 10. The front and rear inner flaps 21, 21 are spaced apart in the front-to-rear direction.

The outer flap 22 is connected to the lower edge of the side wall 12 via a fold line. The front portion of the outer flap 22 overlaps the outer surface (lower surface) of the front inner flap 21, and the rear portion of the outer flap 22 overlaps the outer surface (lower surface) of the rear inner flap 21.

The left outer flap 22 closes the left half of the opening at the bottom of the body 10, and the right outer flap 22 closes the right half of the opening at the bottom of the body 10.
The leading edge portions of the left and right outer flaps 22, 22 are butted against each other at the center in the left-right direction of the upper opening of the body portion 10.
The tips of the outer flaps 22 are connected by attaching adhesive tape (not shown) to the outer surfaces of the tip edges of the outer flaps 22. In this manner, the bottom plate 20 is closed, and the opening on the lower side of the body 10 is blocked by the bottom plate 20.

The top plate 30 is configured symmetrically to the bottom plate 20, and has an inner flap 31 connected to the upper edge of the end wall 11 and an outer flap 32 connected to the upper edge of the side wall 12, with the outer surface (top surface) of the inner flap 31 overlapping the outer surface.

In this embodiment, holes 60 are formed in the lower corners 51 of the box body 50. In this embodiment, holes 60 are formed in the three corners 51 of the box body 50: the front left, front right, and rear right. Each of the front left, front right, and rear right corners 51 is formed by an end wall 11, a side wall 12, an inner flap 21, and an outer flap 22. The holes 60 penetrate the corners 51 of the box body 50.

The hole 60 is formed in the blank sheet S1 shown in Figure 2 at a position where the fold line between the end wall 11 and the side wall 12, the fold line between the end wall 11 and the inner flap 21, and the fold line between the side wall 12 and the outer flap 22 intersect.
The hole 60 is formed in a substantially circular shape in the blank sheet S1. In this embodiment, the hole 60 is divided into the end wall 11, the side wall 12, the inner flap 21, and the outer flap 22. That is, the end wall 11, the side wall 12, the inner flap 21, and the outer flap 22 each have an area corresponding to approximately one-quarter of the edge of the hole 60.
As shown in Figure 1, when the box body 50 is assembled, the edges of the hole 60 in the end wall 11, side wall 12, inner flap 21 and outer flap 22 are connected to form the hole 60 in the corner 51 of the box body 50.

As shown in FIG. 3, the inner flap 21 of the packaging box 1A of the first embodiment has a recessed portion 25 formed by crushing.
The recesses 25 are formed on the inner surface of the inner flap 21 at the edge on the end wall 11 side and at the left and right edges. The recesses 25 extend in a strip shape from the hole 60 along the edges of the inner flap 21.
As shown in FIG. 4, the recessed portion 25 is a portion formed by pressing a sponge-like mold F against the inner surface of the inner flap 21 during the manufacturing process of the blank sheet S1, thereby crushing and recessing the inner surface side of the inner flap 21.
In the first embodiment, the upper surface of the recessed portion 25 is inclined so that the outer side is lower than the center side of the inner flap 21. In this manner, the surface of the formwork F is formed so that the upper surface of the recessed portion 25 is inclined.

In the packaging box 1A of the first embodiment, the outer flap 22 also has a recessed portion 25 formed by crushing.
2, a band-shaped recess 25 is formed in the edge of the outer flap 22 on the side of the end wall 11. The upper surface of the recess 25 of the outer flap 22 is also inclined so that the outer side of the outer flap 22 is lower than the center side.

When the inner flap 21 and outer flap 22 are folded from the blank sheet S1 of the first embodiment and the bottom plate 20 is assembled as shown in Figure 3, band-shaped recesses 25 are formed on the front, rear, left, and right edges of the inner surface of the bottom plate 20. Two recesses 25 extend from each hole 60.

In the packaging box 1A described above, water generated from food products and ice packs stored in the box body 50 shown in Fig. 3 may accumulate on the inner surface of the bottom plate 20. If the bottom plate 20 tilts during transportation in this state, the water on the inner surface of the bottom plate 20 flows into the recess 25. The water flows within the recess 25 toward the hole 60 and is drained to the outside through the hole 60.
At this time, the upper surface of the recessed portion 25 is inclined so that the outer side is lower than the center side of the bottom plate 20, and water is less likely to remain in the recessed portion 25.
In the packaging box 1A of the first embodiment, the recessed portion 25 formed by crushing the inner edge of the bottom plate 20 makes it easier for water inside the box body 50 to drain to the outside through the hole portion 60 of the box body 50, thereby improving drainage efficiency while maintaining the strength of the bottom plate 20.

Although the first embodiment of the present invention has been described above, the present invention is not limited to the first embodiment and can be modified as appropriate within the scope of the invention.
In the packaging box 1A of this embodiment, as shown in Fig. 4, the upper surface of the recessed portion 25 is inclined so that the outer side is lower than the center side of the bottom plate 20, but the shape, width, and depth of the recessed portion 25 are not limited. For example, in a reference example of the present invention, the upper surface of the recessed portion 25 may be formed flat.

As shown in Figure 1, the bottom plate 20 of the packaging box 1A in the first embodiment is configured by stacking an inner flap 21 and an outer flap 22, but the configuration of the bottom plate 20 is not limited to this. For example, a single outer flap 22 may be configured to close the opening on the lower side of the body 10, and a recess 25 may be formed on the inner surface of the outer flap 22.

In the packaging box 1A of the first embodiment, the box body 50 is provided with a top plate 30, but the configuration of the top plate 30 is not limited thereto; for example, an opening may be formed in the top plate 30. Furthermore, the box body 50 may not be provided with a top plate 30, and the top surface of the box body 50 may be formed in a tray shape with an opening.

The body 10 of the packaging box 1A in the first embodiment is formed in a rectangular cylindrical shape, but the shape of the body 10 is not limited to this. For example, an inclined wall may be provided between the end wall 11 and the side wall 12, and the body 10 may be formed into a polygonal cylindrical shape such as a hexagonal or octagonal shape.

The packaging box 1A in the first embodiment is made of corrugated cardboard, but the packaging box may also be made from various known paperboard materials.

[Second embodiment]
Next, a packaging box 1B according to a second embodiment of the present invention will be described.
As shown in FIG. 6, the packaging box 1B of the second embodiment has substantially the same configuration as the packaging box 1A of the first embodiment (see FIG. 3) described above, but differs in the location where the recessed portion 25 is formed.
The packaging box 1B of the second embodiment is formed by mountain-folding or valley-folding the blank sheet S2 shown in Fig. 5 at each fold line. The blank sheet S2 shown in Fig. 5 is arranged so that the inner side is visible.

In the packaging box 1B of the second embodiment, as shown in Figure 6, recesses 25 are formed only on the left and right edges of the inner flap 21. Similar to the first embodiment, the recesses 25 of the second embodiment extend in a strip-like shape from the hole 60, and their upper surfaces are inclined so that the outer edges of the inner flap 21 are lower than the center.

In the packaging box 1B of the second embodiment described above, if the bottom plate 20 tilts during transport, water on the inner surface of the bottom plate 20 flows into the recessed portion 25, flows through the recessed portion 25, and is drained to the outside through the hole 60. This improves drainage efficiency even if the crushed area is small.

The second embodiment of the present invention has been described above, but the present invention is not limited to this second embodiment, and as with the first embodiment, modifications can be made as appropriate without departing from the spirit of the invention.

1A Packaging box (first embodiment)
1B Packaging box (second embodiment)
REFERENCE SIGNS 10 Body 11 End wall 12 Side wall 13 Joint piece 20 Bottom plate 21 Inner flap 22 Outer flap 25 Recessed portion 30 Top plate 31 Inner flap 32 Outer flap 50 Box body 51 Corner portion 60 Hole portion F Formwork S1 Blank sheet (first embodiment)
S2 Blank sheet (second embodiment)

Claims (2)

a cylindrical body portion having front and rear end walls and left and right side walls;
a bottom plate provided at an opening on the lower side of the body portion,
A hole is formed in a lower corner of the box body,
A recess formed by crushing is formed on the edge of the inner surface of the bottom plate,
the recessed portion extends from the hole portion along the edge of the bottom plate ,
A packaging box characterized in that , in a direction intersecting an extension direction of the recessed portion, the upper surface of the recessed portion is inclined so that the outer side is lower than the center side of the bottom plate . The packaging box according to claim 1,
The bottom plate is
an inner flap connected to a lower edge portion of the end wall;
an outer flap connected to the lower edge of the side wall,
The outer flap is overlapped on the outer surface of the inner flap,
The packaging box is characterized in that the recessed portions are formed on the left and right edge portions of the inner flap.