JP7555695B2 - Carton - Google Patents

Description

The present invention relates to a carton.

Conventionally, cartons are known in which the axial ends of the cylindrical body are sealed with inner and outer flaps (see, for example, Patent Document 1).

In the carton described in Patent Document 1, the axial ends of the body, which is made up of the bottom panel, top panel, and side panels, are closed with side flaps (inner flaps) and front and rear flaps (outer flaps) that are placed on top of the side flaps from the outside.

JP 2006-082853 A

However, in the conventional cartons described above, the inner flaps may overlap each other during the box-making process, creating a step, which creates a gap between the inner and outer flaps and causes poor adhesion between the inner and outer flaps.
On the other hand, if the inner flaps are shortened so that they do not overlap, the rigidity of the carton decreases, causing a problem that the carton may become distorted during box making.

The object of the present invention is to provide a carton that can prevent the carton from being distorted during box making while preventing poor adhesion between the inner and outer flaps.

The carton of the present invention comprises a cylindrical body having a pair of first main surface portions arranged opposite each other and a pair of second main surface portions arranged opposite each other in a direction perpendicular to the opposing direction of the pair of first main surface portions, a first inner flap connected to one of the second main surface portions at an axial end of the body and covering that end of the body, a second inner flap connected to the other second main surface portion at an axial end of the body and covering that end of the body, and an outer flap connected to the first main surface portion at an axial end of the body and overlapping and bonded to the first inner flap and the second inner flap from the outside, the first inner flap and the second inner flap having contact portions that can contact each other at their tip edges and non-contact portions that do not contact each other in the region from the position where the outer flap is bonded to the position where the tips of the outer flaps overlap.

According to the present invention, the first inner flap and the second inner flap have contact portions at their leading edges that can come into contact with each other, thereby improving the rigidity of the carton through such contact and preventing the carton from becoming distorted during box making.
In addition, the first inner flap and the second inner flap have non-contact portions extending from the position where the outer flap is attached to the tip of the outer flap, which prevents the first inner flap and the second inner flap from overlapping in that region, thereby preventing gaps from occurring between the inner flap and the outer flap and preventing poor adhesion between the inner flap and the outer flap.

The carton of the present invention comprises a cylindrical body having a pair of first main surface portions arranged opposite each other and a pair of second main surface portions arranged opposite each other in a direction perpendicular to the opposing direction of the pair of first main surface portions, a first inner flap connected to one of the second main surface portions at an axial end of the body and covering that end of the body, a second inner flap connected to the other second main surface portion at an axial end of the body and covering that end of the body, and an outer flap connected to the first main surface portion at an axial end of the body and overlapped and bonded to the first inner flap and the second inner flap from the outside, the first inner flap and the second inner flap being characterized in that they have contact portions at their leading edges that can contact each other and non-contact portions provided at the ends of the outer flaps on the base end side at the leading edges and not in contact with each other.

According to the present invention, the first inner flap and the second inner flap have contact portions at their leading edges that can come into contact with each other, thereby improving the rigidity of the carton through such contact and preventing the carton from becoming distorted during box making.
In addition, the first and second inner flaps have non-contact portions at the end portions of their leading edges on the base end side of the outer flaps, which prevents the corners of the inner flaps on the base end side of the outer flaps that are likely to come into contact during box making from coming into contact with each other, and prevents the first and second inner flaps from overlapping. This prevents gaps from occurring between the inner and outer flaps, and therefore prevents poor adhesion between the inner and outer flaps.

In the carton of the present invention, it is preferable that the non-contact portion of at least one of the first inner flap and the second inner flap is formed so as to gradually separate from the other non-contact portion toward the base end side of the outer flap.

According to the present invention, the non-contact portion of at least one of the first inner flap and the second inner flap is formed so as to gradually separate from the other non-contact portion toward the base end side of the outer flap, so that the area of the inner flap is increased at the tip side of the outer flap to ensure strength, and the corners of the inner flaps can be prevented from contacting each other at the base end side of the outer flap. This makes it possible to more reliably prevent the carton from being distorted during box making, while also preventing poor adhesion between the inner flap and the outer flap.

In the carton of the present invention, it is preferable that the outer flap is sized to partially overlap the first inner flap and the second inner flap, the contact portion is provided in an area where the outer flap does not overlap, and the non-contact portion is provided over the overlapping area from the base end to the tip end of the outer flap.

According to the present invention, the inner flaps are provided with contact portions in the areas where the outer flaps do not overlap, and non-contact portions are provided over the areas where the outer flaps overlap from their base ends to their tips. That is, in the areas where the outer flaps do not overlap, contact portions are provided because there is no problem if the inner flaps overlap, and in the areas where the outer flaps overlap from their base ends to their tips, non-contact portions are provided so that the inner flaps do not overlap over that area. This makes it possible to more reliably prevent poor adhesion between the inner and outer flaps while preventing the carton from warping during box making.

FIG. 2 is a perspective view of a carton according to one embodiment of the present invention. FIG. 2 is an exploded view of the carton in FIG. 1 . 2 is a diagram showing a box-making process for the carton of FIG. 1; FIG. 2 is a side view of the carton of FIG. 1 . FIG. 11 is a side view of a carton according to a modified example of the present invention. FIG. 11 is a side view of a carton according to a modified example of the present invention. FIG. 11 is a side view of a carton according to a modified example of the present invention. FIG. 11 is a side view of a carton according to a modified example of the present invention. FIG. 11 is a side view of a carton according to a modified example of the present invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In the following description, directions are indicated based on the state in which the carton 1 is placed as shown in FIG.

Fig. 1 is a perspective view showing a carton 1 according to this embodiment. Fig. 2 is a development view of the carton 1 (a plan view of a carton-forming panel (also called a carton blank) 1A).
In Fig. 1, the carton 1 is a so-called wrap-around type corrugated cardboard box formed into a rectangular parallelepiped, in which the contents FD (see Fig. 3) are wrapped in a carton-forming panel 1A shown in Fig. 2 to form a box. The contents FD can be, for example, food products such as beverages, margarine, cheese, etc., each contained in a container, as well as detergent contained in a container.

1 and 2, carton 1 comprises a body 2, a bottom surface 3A as a first main surface portion, a top surface 3B as the first main surface portion, a first side surface portion 4A as one second main surface portion, a second side surface portion 4B as the other second main surface portion, a body 5, a first inner flap 6A, a second inner flap 6B, a first outer flap 7A, a second outer flap 7B, and a tear strip 8.
The body portion 2 is composed of a bottom surface portion 3A, a top surface portion 3B, a first side surface portion 4A, a second side surface portion 4B, and a body extension portion 5.

The bottom surface portion 3A is formed in a generally rectangular shape in a plan view. The bottom surface portion 3A is connected to the first side surface portion 4A via a fold line 31A, to the second side surface portion 4B via a fold line 32A, and to the first outer flap 7A via a fold line 33A.

The top surface portion 3B is formed in a generally rectangular shape in a plan view and is disposed opposite the bottom surface portion 3A. The top surface portion 3B is connected to the second side surface portion 4B via a fold line 31B, connected to the second outer flap 7B via a fold line 32B, and connected to the torso portion 5 via a fold line 33B.

The first side portion 4A and the second side portion 4B are arranged opposite each other in a direction perpendicular to the opposing direction of the bottom portion 3A and the top portion 3B. The first side portion 4A and the second side portion 4B are side portions on the long sides of the carton 1, with the first side portion 4A arranged on one long side and the second side portion 4B arranged on the other long side.

The body extension portion 5 is a sealing portion used when forming the body portion 2, and is attached to the first side portion 4A from the outside with an adhesive AD such as a hot melt adhesive.

The first inner flap 6A, the second inner flap 6B, the first outer flap 7A, and the second outer flap 7B are side portions on the short sides of the carton 1, and each outer flap 7A, 7B is positioned overlapping the first inner flap 6A and the second inner flap 6B.

The first inner flap 6A is connected to the first side portion 4A via the fold lines 41A at both axial end portions of the body portion 2, and covers those end portions of the body portion 2. The first inner flap 6A has a contact portion 61A and a non-contact portion 62A.
The contact portion 61A is a tip portion of the first inner flap 6A, and is configured so that its tip edge comes into contact with the tip edge of the second inner flap 6B.
The non-contact portion 62A is formed by cutting out the leading edge of the first inner flap 6A, and is configured not to come into contact with the second inner flap 6B in an area AR1 from the position where the first outer flap 7A is adhered with the adhesive AD to the position where the leading end of the first outer flap 7A overlaps. In the present embodiment, the non-contact portion 62A is provided over an area AR2 where the base end to the leading end of the first outer flap 7A overlaps, and extends to a part of the tear strip 8.

The second inner flap 6B is connected to the second side portion 4B via a fold line 41B at the axial end of the body portion 2, and covers that end of the body portion 2. Since the second inner flap 6B has the same configuration as the first inner flap 6A, it is illustrated with the last symbol A of the reference number of the first inner flap 6A replaced with B, and its description is omitted.

The first outer flap 7A is connected to the bottom surface portion 3A at the axial end of the body portion 2, and is glued to overlap the first inner flap 6A and the second inner flap 6B from the outside. The first outer flap 7A is sized to partially overlap the first inner flap 6A and the second inner flap 6B, and is formed so that its tip is located closer to the bottom surface portion 3A than the first cutting line 81 of the tear strip 8.

The second outer flap 7B is connected to the upper surface portion 3B at the axial end of the body portion 2 and is glued to overlap the first inner flap 6A and the second inner flap 6B from the outside. The second outer flap 7B is sized to partially overlap the first inner flap 6A and the second inner flap 6B, and is formed so that its tip is located on the upper surface portion 3B side of the second cutting line 82 of the tear strip 8.

The tear strip 8 is provided across the first side surface portion 4A and the first inner flap 6A, and across the second side surface portion 4B and the second inner flap 6B. The tear strip 8 is formed by a first cutting line 81 provided on the bottom surface portion 3A side and a second cutting line 82 provided on the top surface portion 3B side.

When manufacturing the above carton 1, as shown in Figure 3, with the contents FD placed on the bottom surface 3A, the first side surface 4A and the second side surface 4B are folded up so that they face each other, while the top surface 3B, the body 5, the inner flaps 6A, 6B, and the outer flaps 7A, 7B are folded inward. Then, the outer flaps 7A, 7B are glued to the first inner flap 6A and the second inner flap 6B from the outside, and the body 5 is glued to the first side surface 4A from the outside.

As shown by the two-dot chain line in Figure 3, if the first inner flap 6A and the second inner flap 6B do not have non-contact portions 62A, 62B, if the timing of folding the first side portion 4A, the second side portion 4B, the first inner flap 6A, and the second inner flap 6B is not synchronized, the corners of the inner flaps 6A, 6B on the bottom portion 3A side will interfere with each other, or the first inner flap 6A and the second inner flap 6B will overlap.

In contrast, in the carton 1, as shown in FIG. 3, the first inner flap 6A and the second inner flap 6B are provided with non-contacting portions 62A, 62B, which prevents the corners of the inner flaps 6A, 6B on the bottom surface portion 3A side from interfering with each other, and prevents the first inner flap 6A and the second inner flap 6B from overlapping. Therefore, as shown in FIG. 4, the first inner flap 6A and the second inner flap 6B can be brought into contact with each other at their leading edges without overlapping with each other.

According to the embodiment described above, the first inner flap 6A and the second inner flap 6B have contact portions 61A, 61B that can come into contact with each other at their tip edges, thereby improving the rigidity of the carton 1 through such contact and preventing the carton 1 from becoming distorted during box making.
In addition, the first inner flap 6A and the second inner flap 6B are provided with the non-contact portions 62A, 62B over the region AR1 from the position where the first outer flap 7A is adhered to the tip position of the first outer flap 7A, so that the first inner flap 6A and the second inner flap 6B can be prevented from overlapping in this region. This makes it possible to prevent gaps from being generated between the inner flaps 6A, 6B and the outer flaps 7A, 7B, and therefore prevents poor adhesion between the inner flaps 6A, 6B and the outer flaps 7A, 7B.

Furthermore, the first inner flap 6A and the second inner flap 6B are provided with non-contact portions 62A, 62B at the end portions of their leading edges on the base end side of the first outer flap 7A, which prevents the corners of the inner flaps 6A, 6B on the base end side of the outer flaps, which are likely to come into contact during box making, from coming into contact with each other, and more reliably prevents the first inner flap 6A and the second inner flap 6B from overlapping.

In addition, contact portions 61A, 61B are provided in the area of each inner flap 6A, 6B where the first outer flap 7A does not overlap, and non-contact portions 62A, 62B are provided over the area AR2 where the base end to the tip of the first outer flap 7A overlap. That is, in the area where the first outer flap 7A does not overlap, the contact portions 61A, 61B are provided because there is no problem even if the inner flaps 6A, 6B overlap, and in the area AR2 where the base end to the tip of the first outer flap 7A overlap, the non-contact portions 62A, 62B are provided so that the inner flaps 6A, 6B do not overlap over the area AR2. This makes it possible to more reliably prevent poor adhesion between the inner flaps 6A, 6B and the outer flaps 7A, 7B while preventing the carton 1 from being distorted during box making.

[Modification]
The present invention is not limited to the above-described embodiment, and modifications and improvements within the scope of the present invention are included in the present invention.
For example, the carton 1 is not limited to a wrap-around type, and may be of any type, and may be made of paper other than cardboard. Also, although the carton 1 is suitable for storing food, detergent, etc., it may be used to store other items FD.
The carton 1 is not limited to a rectangular prism shape, but may be, for example, a cube shape, or a prism shape in which the bottom surface 3A and the top surface 3B are a parallelogram, a rhombus, or another such quadrilateral, or a polygon with five or more sides.
The body 2 may be tubular, for example, triangular when viewed from the side, quadrangular other than rectangular such as a square or a rhombus, or a polygonal shape with five or more sides.

The folding lines 32B, 33A, and 33B may be cut lines having a plurality of linear cuts arranged in an intermittent row.
The folding lines 31A to 33A, 31B to 33B, 41A, 41B may be formed of, for example, altered portions obtained by partially altering the folding lines 31A to 33A, 31B to 33B, 41A, 41B, or may be formed of thin-walled portions obtained by thinning the folding lines 31A to 33A, 31B to 33B, 41A, 41B. In this case, the altered portions or thin-walled portions may be provided intermittently or in the form of a continuous line.

As shown in FIG. 5, the non-contact portions 62A, 62B of the first inner flap 6A and the second inner flap 6B do not have to extend to a portion of the tear strip 8, and may extend to the first cutting line 81 of the tear strip 8, for example. In this case, it is preferable that at least one of the first inner flap 6A and the second inner flap 6B has a notch 63A, 63B to make it easier to grip the tear strip 8, as shown in FIG. 5.

As shown in Figures 6 and 7, the non-contacting portions 62A, 62B may be formed so that they gradually move away from each other toward the base end side of the first outer flap 7A. This makes it possible to increase the area of each inner flap 6A, 6B at the tip side of the first outer flap 7A to ensure strength, while preventing the corners of the inner flaps 6A, 6B from contacting each other at the base end side of the first outer flap 7A. This makes it possible to more reliably prevent the carton 1 from being distorted during box making, while also preventing poor adhesion between the inner flaps 6A, 6B and the outer flaps 7A, 7B.

As shown by solid lines and two-dot chain lines in Figures 5 to 7, the non-contacting portions 62A, 62B may be provided in the area AR2 where the first outer flap 7A overlaps and the area AR3 where the base end to the tip end of the second outer flap 7B overlaps, or may be provided only in the area AR3 where the second outer flap 7B overlaps. By providing the non-contacting portions 62A, 62B in the area AR2 where the first outer flap 7A overlaps and the area AR3 where the second outer flap 7B overlaps, it is possible to more reliably prevent the first inner flap 6A and the second inner flap 6B from overlapping.

As shown in Figs. 7 and 8, the first inner flap 6A and the second inner flap 6B may have contact portions 61A and 61B in the area AR2 where the first outer flap 7A overlaps. For example, as shown in Fig. 7, contact portions 61A and 61B may be provided at the tip end of the first outer flap 7A at the tip edge of each inner flap 6A and 6B, and non-contact portions 62A and 62B may be provided at the base end end of the first outer flap 7A at the tip edge of each inner flap 6A and 6B. Also, as shown in Fig. 8, contact portions 61A and 61B may be provided at the base end end of the first outer flap 7A at the tip edge of each inner flap 6A and 6B, and non-contact portions 62A and 62B may be provided at the tip end of the first outer flap 7A at the tip edge of each inner flap 6A and 6B.

As shown in FIG. 8, when the contact portions 61A, 61B are provided at the end portion on the base end side of the first outer flap 7A, the non-contact portions 62A, 62B are provided at least over the region AR1 from the position where the first outer flap 7A is adhered to the position where the tip of the first outer flap 7A overlaps, as shown by the solid line in FIG. 8, and preferably, are provided at least over the region AR4 from the position where the first outer flap 7A is adhered to the position where the second outer flap 7B is adhered, as shown by the solid line and the two-dot chain line in FIG. 8.

As shown in FIG. 9, only one of the non-contact portions 62A, 62B may be formed to have a notched shape, and the other may be formed to have no notch.
The shape of the non-contacting portions 62A, 62B is not particularly limited as long as they do not come into contact with each other, and may be, for example, a semicircular, arc-shaped, curved line-shaped, or bent line-shaped cutout.

The first inner flap 6A may be connected to the bottom surface portion 3A as the second main surface portion, and the second inner flap 6B may be connected to the top surface portion 3B as the second main surface portion. In this case, the first outer flap 7A is connected to the first side surface portion 4A as the first main surface portion, and the second outer flap 7B is connected to the second side surface portion 4B as the first main surface portion.

Either the first outer flap 7A or the second outer flap 7B may be omitted, and the other may be sized to overlap substantially the entire surface of the first inner flap 6A and the second inner flap 6B.

The tear strip 8 may be provided only on either the first side portion 4A and the first inner flap 6A or the second side portion 4B and the second inner flap 6B.
Also, instead of the tear strip 8, a cut tape provided on the inside of the side portions 4A, 4B and the inner flaps 6A, 6B may be used.
The first cutting line 81 and the second cutting line 82 may be, for example, in the shape of a perforation, or in the shape of a zipper with the ends of each cut inclined toward the tear strip 8, or may be composed of altered portions in which the side portions 4A, 4B and the inner flaps 6A, 6B are partially altered, or thin-walled portions in which the side portions 4A, 4B and the inner flaps 6A, 6B are thin-walled.

1...carton, 2...body portion, 3A...bottom portion (first main surface portion), 3B...top portion (first main surface portion), 4A...first side portion (one second main surface portion), 4B...second side portion (the other second main surface portion), 6A...first inner flap, 6B...second inner flap, 7A...first outer flap (outer flap), 7B...second outer flap (outer flap), 61A, 61B...contact portion, 62A, 62B...non-contact portion.

Claims (2)

a cylindrical body portion having a pair of first main surface portions arranged opposite to each other, a pair of second main surface portions arranged opposite to each other in a direction perpendicular to the opposing direction of the pair of first main surface portions, and a body extension portion that bonds one of the first main surface portions and one of the second main surface portions;
A first inner flap that is connected to one of the second main surface portions at an axial end portion of the body portion and covers the end portion of the body portion;
A second inner flap that is connected to the other second main surface portion at an axial end of the body portion and covers the end of the body portion;
an outer flap connected to the other first main surface portion at an axial end of the body portion and overlapping and bonded to the first inner flap and the second inner flap from the outside;
a contact portion at the leading edge of the first inner flap and the second inner flap, the contact portion being capable of contacting each other; and a non-contact portion extending from the end of the base end of the outer flap at the leading edge to a portion of the tear strip, the non-contact portion being capable of not contacting each other. The carton according to claim 1, characterized in that the non-contact portion of at least one of the first inner flap and the second inner flap is formed so as to gradually separate from the other non-contact portion toward the base end side of the outer flap.

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