JP2024148787A - Packaging box - Google Patents

Abstract

To provide a packaging box which can be opened by easily cutting open transverse cutting guide lines while increasing the degree of freedom of the positions of the transverse cutting guide lines.SOLUTION: A packaging box 1 includes: a body part 10 formed in a cylindrical shape; and a top plate 20 and a bottom plate 30 provided above and below the body part 10. A transverse cutting guide line L50 is formed extending around the entire circumference of the body part 10, and two first cutting guide lines L10, L10 are formed extending from an upper edge of the body part 10 to the transverse cutting guide line L50. Both ends of the second cutting guide line L20 formed on the top plate 20 are connected to upper ends of both first cutting guide lines L10, L10, respectively, and a middle part of the second cutting guide line L20 is bent so as to protrude toward a center of the top plate 20. An opening start part 50 surrounded by the transverse cutting guide line L50, both first cutting guide lines L10, L10, and the second cutting guide line L20 is formed on the top plate 20 and the body part 10.SELECTED DRAWING: Figure 1

Description

The present invention relates to a packaging box.

2. Description of the Related Art Some corrugated cardboard packaging boxes have a cutting guide line formed around the entire circumference of the body and an opening start portion provided on the body (see, for example, Patent Document 1).
When opening the above-mentioned packaging box, the opening start part is pushed into the inside of the body part to form an opening in the body part, and a hand is inserted into the opening and the upper part of the body part is pulled up, thereby cutting open the cutting guide line and separating the body part into upper and lower parts.

Utility Model Registration No. 3208228 Patent No. 7221201 Patent No. 6590854

When the contents are packed in the packaging box, the contents come into contact with the inner surface of the body. In particular, when the cross section of the contents is a square cylinder, the outer surface of the contents comes into contact with the inner surface of the body without any gaps. In such a case, with the conventional packaging box described above, when the opening start part is pushed inwardly of the body, it is difficult for the opening start part to come into contact with the contents and be pushed in, so the position of the opening start part is limited by the shape of the contents. As a result, when a horizontal cutting guide line is formed around the entire circumference of the body and the lower half of the body after opening is used as a tray for displaying the contents, as in Patent Documents 2 and 3, the height of the side walls of the display tray is limited by the shape of the contents.

The present invention aims to solve the above problems, increase the degree of freedom in the position of the horizontal cutting guide line, and provide a packaging box that can be opened by easily cutting open the opening start part and the horizontal cutting guide line.

In order to solve the above problem, the present invention provides a packaging box comprising a body formed into a cylindrical shape by walls, a top plate provided at an upper opening of the body, and a bottom plate provided at a lower opening of the body. A horizontal cutting guide line extending horizontally is formed around the entire circumference of the body, and two first cutting guide lines extending vertically from the upper edge of the body across the horizontal cutting guide line are formed at a horizontal interval. A second cutting guide line is formed on the top plate, and both ends of the second cutting guide line are connected to the upper ends of both first cutting guide lines, respectively, and the middle part of the second cutting guide line is bent so as to protrude toward the center of the top plate. An opening start portion surrounded by the horizontal cutting guide line, both first cutting guide lines, and the second cutting guide line is formed on the top plate and the body.

When opening the packaging box of the present invention, first, the opening start portion of the top plate is pushed downward to cut open the second cutting guide line. When the contents are bottles, the upper portion of the bottle has a smaller outer diameter than the lower portion, so that the upper space in the body has a large open area. Even when the contents are packed in the body, a gap is often formed between the top plate and the contents.
Therefore, in the packaging box of the present invention, the opening start portion of the top plate can be reliably pushed into the inside of the body portion, and the opening start portion can be separated from the top plate.
Next, the opening start portion is pulled down to cut open both first cutting guide lines and separate the opening start portion from the wall body, thereby forming an opening extending from the top plate to the horizontal cutting guide lines of the wall body.
Furthermore, by placing hands on the side edge of the opening in the wall and pulling the wall outward, the horizontal cutting guide line is cut open. The opening extends to the top plate, and part of the corner where the top plate and the wall meet is cut off, so the upper part of the wall is easily deformed. This allows the wall to be pulled outward widely, making it easy to cut open the horizontal cutting guide line.
Then, the packaging box can be opened by cutting open all of the horizontal cutting guide lines and separating the body into upper and lower halves.
In addition, in the packaging box of the present invention, when the body is separated into the upper and lower halves, a single horizontal cutting guide line is cut open, so no cutting waste is generated.

It is preferable to form a slit in the section between the lower ends of the first cutting guide lines of the transverse cutting guide line to make it easier to separate the opening start portion from the wall body.

In the above-mentioned packaging box, when the transverse cutting guide line is formed in a wavy shape curved in the vertical direction, the transverse cutting guide line can be cut open neatly with a small force, which improves the appearance when the lower part of the packaging box is used as a tray after opening.
In addition, even when a load acts on the packaging box from above and the wall body bulges outward, the transverse cutting guide line is unlikely to tear, so that a decrease in the strength of the packaging box against vertical loads can be suppressed.

In the packaging box described above, multiple opening start sections are formed, and the horizontal cutting guide lines are cut open from multiple locations, making it easier to open the packaging box.

The top plate of the packaging box may include two inner flaps connected to the upper edge of the body and an outer flap connected to the upper edge of the body and overlapped on the upper surfaces of the inner flaps, and the leading edges of the inner flaps may be spaced apart. In this case, it is preferable to form the second cutting guide line on the outer flap at a position corresponding to the space between the leading edges of the inner flaps.
In this way, when the opening start portion of the top plate is pushed in from the outside, the opening start portion does not interfere with the inner flap, so that the opening start portion can be easily pushed inwardly of the body portion.

In the packaging box of the present invention, the opening start portion extends from the top plate to the horizontal cutting guide line of the body, so the opening start portion can be easily cut open from the top plate side to form an opening, and the horizontal cutting guide line can be cut open from the opening, making it easy to open the packaging box.

1 is a perspective view of a packaging box according to an embodiment of the present invention, viewed from the upper right front side. FIG. FIG. 2 is a diagram showing a blank sheet for a packaging box according to an embodiment of the present invention. FIG. 1 is a front view showing a packaging box according to an embodiment of the present invention. FIG. 10 is a perspective view showing a procedure for opening the packaging box according to the embodiment of the present invention, in which an opening start portion is cut off. FIG. 10 is a perspective view showing a procedure for opening the packaging box according to the embodiment of the present invention, in which the packaging box is separated into upper and lower halves.

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

As shown in FIG. 1, the packaging box 1 of this embodiment includes a cylindrical body 10, a top plate 20 provided at the upper opening of the body 10, and a bottom plate 30 provided at the lower opening of the body 10. The packaging box 1 of this embodiment is an A-type cardboard box.

The packaging box 1 of this embodiment is formed by mountain-folding or valley-folding a blank sheet S cut out from a cardboard sheet at each fold line, as shown in Fig. 2. The blank sheet S shown in Fig. 2 is arranged so that the inner side is visible.
The fold lines of the blank sheet S are creases (pressed creases) formed by linearly pressing the surface of the blank sheet S. Note that intermittent cuts may be formed in the creases. In this way, it becomes easier to fold the blank sheet S 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 a slit penetrating the sheet in an intermittent linear fashion.

Each cutting guide line formed on the blank sheet S is a perforated line with intermittent cuts. Note that the shape and length of the cuts are not limited.

1, the body 10 has a pair of front and rear end walls 11, 11 and a pair of left and right side walls 12, 12. The end wall 11 and the side wall 12 are formed in a rectangular shape. The end wall 11 and the side wall 12 are the "walls" in the claims.
In this embodiment, a strip-shaped joint piece 13 is provided continuously on the left edge portion of the rear end wall 11 (see FIG. 2 ). The joint piece 13 is attached to the inner surface of the left side wall 12.

When the blank sheet S (see Figure 2) is folded along each of the lines and the joining piece 13 is joined to the inner surface of the left side wall 12, the front and rear end walls 11, 11 and the left and right side walls 12, 12 form a cylindrical body 10 that is rectangular in plan view.

The top plate 20 includes a pair of front and rear outer flaps 21, 21 connected to the upper edges of the front and rear end walls 11, 11, respectively, and a pair of left and right inner flaps 22, 22 connected to the upper edges of the left and right side walls 12, 12, respectively (see FIG. 2). The tip edges of the inner flaps 22, 22 are spaced apart in the left-right direction.
The top plate 20 of this embodiment is formed by overlapping two outer flaps 21, 21 on the upper surfaces of two inner flaps 22, 22 and butting the leading edge portions of the two outer flaps 21, 21 together.

The bottom plate 30 has a pair of front and rear outer flaps 31, 31 connected to the lower edges of the front and rear end walls 11, 11, respectively, and a pair of left and right inner flaps 32, 32 connected to the lower edges of the left and right side walls 12, 12, respectively (see Figure 2).
The bottom plate 30 of this embodiment is formed by overlapping two outer flaps 31, 31 on the lower surfaces of two inner flaps 32, 32.

A transverse cutting guide line L50 is formed in the body 10. The transverse cutting guide line L50 extends in the transverse direction and is formed around the entire circumference of the body 10. That is, the transverse cutting guide line L50 is formed along the left and right side edges of the end wall 11, and the transverse cutting guide line L50 is formed along the front and rear side edges of the side wall 12.
The body 10 is divided into an upper portion and a lower portion by a horizontal cutting guide line L50 as a boundary line. The horizontal cutting guide line L50 is formed below the center of the body 10 in the up-down direction.
The horizontal cutting guide line L50 of this embodiment is formed in a wavy shape with repeated concaves and convexes curved in an arc in the vertical direction (see FIG. 2).

As shown in FIG. 3, the front end wall 11 is formed with two first cutting guide lines L10, L10 extending vertically from the upper edge to the horizontal cutting guide line L50. The first cutting guide lines L10, L10 are formed parallel to each other with a gap between them in the horizontal direction.

The upper ends of both first cutting guide wires L10, L10 are connected to the upper edge of the end wall 11 at a position between the leading edges of the left and right inner flaps 22, 22, as shown in FIG. 1.

As shown in FIG. 3, the lower ends of both first cutting guide lines L10, L10 are connected to a horizontal cutting guide line L50. A linear slit L30 is formed in the section of the horizontal cutting guide line L50 between the lower ends of both first cutting guide lines L10, L10.

As shown in FIG. 1, a second cutting guide line L20 is formed on the outer flap 21 on the front side of the top plate 20.
The second cutting guide wire L20 is formed in a U-shape, with one end (the left end) connected to the upper end of the first cutting guide wire L10 on the left side of the end wall 11, and the other end (the right end) connected to the upper end of the first cutting guide wire L10 on the right side of the end wall 11.
The middle portion of the second cutting guide wire L20 is curved in an arc shape so as to protrude toward the center of the top plate 20.
The second cutting guide line L20 is formed on the outer flap 21 at a position corresponding to the area between the tip edges of the left and right inner flaps 22, 22.

The packaging box 1 has an opening start portion 50 surrounded by the slit L30 of the horizontal cutting guide line L50, the left and right first cutting guide lines L10, L10, and the second cutting guide line L20. The opening start portion 50 is a band-shaped region formed from the top plate 20 to the horizontal cutting guide line L50 of the end wall 11.
As shown in FIG. 4 , when the slit L30 of the horizontal cutting guide line L50, the left and right first cutting guide lines L10, L10 and the second cutting guide line L20 are cut open and the opening start portion 50 is separated from the top plate 20 and the end wall 11, an opening 60 is formed in the top plate 20 and the end wall 11.

1, left and right first cutting guide lines L10, L10 are formed on the rear end wall 11 in the same manner as the front end wall 11. Also, a second cutting guide line L20 is formed on the rear outer flap 21 of the top plate 20 in the same manner as the front outer flap 21.
In this manner, the packaging box 1 of this embodiment is formed with two opening start portions 50, 50 at the front and rear.

The contents to be stored in the packaging box of the present invention are not limited. In the packaging box 1 of this embodiment, as shown in Fig. 3, a plurality of bottles B are stored side by side. The lower part of each bottle B is in contact with the inner surface of the body part 10.
The outer diameter of the upper part of the bottle B on the spout side is smaller than that of the lower part. Therefore, the upper parts of two adjacent bottles B, B are spaced apart. This leaves a large open area in the upper part of the internal space of the body 10.
In the packaging box 1, the position of the opening start part 50 is set according to the shape of the contents so that there is a space below the opening start part 50 of the top plate 20 when the contents are contained therein.

When opening the packaging box 1 of this embodiment, first, the opening start portion 50 of the top plate 20 shown in FIG. 1 is pushed in from the outside, the second cutting guide line L20 is cut open, and the opening start portion 50 is separated from the top plate 20.
4, the upper end of the opening start portion 50 is pulled out to the outside of the end wall 11, and the opening start portion 50 is pulled down. As a result, both first cutting guide lines L10, L10 are cut open from the top to the bottom.

When both first cutting guide lines L10, L10 are entirely cut open, the opening start portion 50 is cut off from the horizontal cutting guide line L50 at the slit L30, and the opening start portion 50 is cut off from the end wall 11.
As a result, a band-shaped opening 60 is formed from the top plate 20 to the horizontal cutting guide line L50 of the end wall 11. In the packaging box 1 of this embodiment, two openings 60, 60 are formed at the front and rear.

After the opening 60 is formed in the packaging box 1, the left and right side edges of the opening 60 are grasped with hands and the end wall 11 is pulled outward. As a result, as shown in Fig. 5, the transverse cutting guide line L50 is cut open from the opening 60 side toward the side edge of the end wall 11, and further, the transverse cutting guide line L50 of the side wall 12 is also cut open.
Then, when the entire transverse cutting guide line L50 is cut open from the front and rear openings 60, 60, the torso 10 is separated into upper and lower halves.
In this way, when the upper part of the packaging box 1 is cut off from the lower part and opened, the lower part of the packaging box 1 becomes a tray, so that the contents can be displayed in a state where they are contained in the tray.

In the above-described packaging box 1, a space is provided below the opening start portion 50 of the top plate 20 shown in Fig. 1 (see Fig. 3). The opening start portion 50 of the top plate 20 is formed at a position corresponding to the space between the leading edge portions of both inner flaps 22, 22.
As a result, as shown in FIG. 4 , when opening the packaging box 1 , the opening start portion 50 of the top plate 20 can be reliably pushed into the inside of the body portion 10 , and the opening start portion 50 can be easily separated from the top plate 20 .
Therefore, in the packaging box 1 of this embodiment, as shown in Fig. 3, even if the outer surface of the lower part of the bottle B as the content is in contact with the inner surface of the body part 10 without any gap, the transverse cutting guide line L50 is arranged on the lower part of the body part 10, and the transverse cutting guide line L50 can be easily cut open from the opening start part 50. In this way, in the packaging box 1 of this embodiment, the degree of freedom of the position (height) of the transverse cutting guide line L50 can be increased, and as shown in Fig. 5, the height of the wall part of the display tray formed by the lower part of the packaging box 1 when opened can be set without being affected by the shape of the content.

In the packaging box 1 of this embodiment, as shown in FIG. 4, when the opening start portion 50 is cut off from the end wall 11, an opening 60 is formed that extends from the top plate 20 to the horizontal cutting guide line L50 of the end wall 11.
As shown in FIG. 3 , a slit L30 is formed in the section of the horizontal cutting guide line L50 that corresponds to the opening start portion 50, so that the opening start portion 50 can be easily separated from the end wall 11.

In addition, in the packaging box 1 of this embodiment, by placing hands on the left and right side edges of the opening 60 and pulling the end wall 11 outward, the transverse cutting guide line L50 can be cut open as shown in FIG.
Since the opening 60 extends into the top plate 20 and a part of the corner where the top plate 20 and the end wall 11 meet is cut off, the upper part of the end wall 11 is easily deformed.
In addition, since the horizontal cutting guide line L50 is cut open from the front and rear openings 60, 60, the entire horizontal cutting guide line L50 can be easily cut open.
In this manner, in the packaging box 1 of this embodiment, the packaging box 1 can be easily opened by simply cutting open the horizontal cutting guide line L50 and separating the body portion 10 into upper and lower portions.
In addition, in the packaging box 1 of this embodiment, when the body portion 10 is separated into the upper and lower portions, a single horizontal cutting guide line L50 is cut open, so that no cutting waste is generated.

In the packaging box 1 of the present invention, as shown in Fig. 1, the horizontal cutting guide line L50 is formed in a wavy shape curved in the vertical direction, so that the horizontal cutting guide line L50 can be neatly cut open with a small force. This improves the appearance when the lower part of the packaging box 1 is used as a tray after opening.
In addition, even when a load acts on the packaging box 1 from above, causing the end walls 11 and the side walls 12 to bulge outward, the end walls 11 and the side walls 12 are less likely to tear from the wavy transverse cutting guide lines L50, so that a decrease in the strength of the packaging box 1 against compressive forces in the vertical direction can be suppressed.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and can be appropriately modified without departing from the spirit of the present invention.
In the packaging box 1 of this embodiment, as shown in Fig. 1, two opening start parts 50, 50 are formed at the front and rear, but the number of opening start parts 50 is not limited. For example, the opening start part 50 may be formed only at the front or rear of the packaging box 1. Also, the opening start part 50 may be formed on the left and right sides of the packaging box 1.

In the packaging box of the present invention, the positions and shapes of the transverse cutting guide line, first cutting guide line, and second cutting guide line are not limited, and are set according to the storage state of the contents.

In the packaging box 1 of this embodiment, the entire horizontal cutting guide line L50 is formed in a wavy shape curved in the vertical direction, but a part of the horizontal cutting guide line L50 may be formed in a wavy shape and the other part may be formed in a straight line. Furthermore, the entire horizontal cutting guide line L50 may be formed in a straight line.

In the packaging box 1 of this embodiment, a straight slit L30 is formed in the horizontal cutting guide line L50, but the slit L30 may be curved to match the wavy shape of the horizontal cutting guide line L50.

In the packaging box 1 of this embodiment, the body 10 is formed into a rectangular tube shape by the front and rear end walls 11, 11 and the left and right side walls 12, 12, but the number of end walls 11 and side walls 12 constituting the body 10 is not limited. For example, the body may be formed into a triangular, hexagonal, or octagonal shape. Furthermore, the body may be formed into a cylindrical shape.
In the packaging box 1 of this embodiment, the top plate 20 and the bottom plate 30 are configured by overlapping a plurality of flaps, but the configuration of the bottom plate and the top plate is not limited thereto.
The packaging box 1 of this embodiment is an A-type corrugated cardboard box, but the present invention is applicable to packaging boxes of various shapes.
The packaging box 1 of this embodiment is made of corrugated cardboard, but the packaging box can be formed from various known paperboards.

REFERENCE SIGNS LIST 1 Packaging box 10 Body 11 End wall 12 Side wall 13 Joint piece 20 Top plate 21 Outer flap 22 Inner flap 30 Bottom plate 31 Outer flap 32 Inner flap 50 Opening start portion 60 Opening B Bottle L10 First cutting guide line L20 Second cutting guide line L30 Slit L50 Horizontal cutting guide line S Blank sheet

Claims (5)

A body portion formed into a cylindrical shape by a wall body;
A top plate provided at an upper opening of the body portion;
A bottom plate provided at an opening on the lower side of the body portion,
A transverse cutting guide line extending laterally is formed around the entire circumference of the body portion,
Two first cutting guide lines extending in the vertical direction from the upper edge of the body to the horizontal cutting guide line are formed at a distance in the horizontal direction,
The top plate is provided with a second cutting guide line;
Both ends of the second cutting guide wire are connected to the upper ends of the first cutting guide wires, respectively;
The intermediate portion of the second cutting guide wire is bent so as to protrude toward the center of the top plate,
A packaging box, characterized in that an opening start portion surrounded by the transverse cutting guide line, both of the first cutting guide lines, and the second cutting guide line is formed on the top plate and the body portion. The packaging box according to claim 1,
A packaging box, wherein a slit is formed in a section of the horizontal cutting guide line between lower ends of the first cutting guide lines. The packaging box according to claim 1,
The packaging box is characterized in that the horizontal cutting guide line is formed in a wavy shape curved in the vertical direction. The packaging box according to claim 1,
A packaging box having a plurality of the opening start portions formed therein. The packaging box according to claim 1,
The top plate is
Two inner flaps connected to the upper edge of the body;
An outer flap is connected to the upper edge of the body and overlapped on the upper surfaces of both the inner flaps,
The tip edges of the inner flaps are spaced apart from each other,
The packaging box according to claim 1, wherein the second cutting guide line is formed on the outer flap at a position corresponding to a space between the leading edges of both the inner flaps.

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