JP2023121300A - Corrugated cardboard box - Google Patents

Abstract

To reduce a force required to separate a separable area.SOLUTION: A corrugated cardboard box 30 includes an opening-side wall forming portion 40, a pair of outer-peripheral-surface forming flaps 42, 44 facing each other, and a bottom-surface forming portion. The opening-side wall forming portion 40 has a pair of base walls facing each other and serving as different parts of the side wall, and a pair of side walls 64, 66 facing each other and serving as different parts of the side wall. At least one of the side walls 64, 66 has a separable area 92 and a fracture guide area 94. When the pair of outer-peripheral-surface forming flaps 42, 44 are in contact with each other, the separable area 92 is disposed under respective ends of both the flaps. The fracture guide area 94 is adjacent to the separable area 92 to separate the separable area 92 from a periphery thereof. An opening forming edge 84, 86 of the side wall 64, 66 having the separable area 92 has a both-end adjacent portion. The both-end adjacent portion is composed of either end of the corrugated cardboard. The separable area 92 and the fracture guide area 94 are in contact with the both-end adjacent portion.SELECTED DRAWING: Figure 3

Description

The present invention relates to cardboard boxes.

Patent Literature 1 discloses a cardboard box. The corrugated box is assembled from corrugated board having a corrugated core, a front liner laminated to the front side of the core, and a back liner laminated to the back side of the core. This corrugated cardboard box includes a bottom wall, four side walls erected from the bottom wall, and a top flap. The top flap extends from the upper edge of each of the front and rear sidewalls of the four peripheral sidewalls. When the top flaps are folded inward, the top edges are butted against each other. The corrugated cardboard box is arranged so that the width direction of the corrugated cardboard is the vertical direction on the four peripheral side walls. In this cardboard box, a sealing adhesive tape is pasted from the upper part of the other side wall of the four peripheral side walls to the upper part of one side wall of the four peripheral side walls through the abutting portions of the top flaps. An end of an adhesive tape is attached to at least one of the other side wall and the one side wall of the corrugated cardboard box below the abutting portions of the top flaps. The cardboard box has a rectangular detachable area and a push area that can be cut away. The horizontally extending lower side of the separable area is formed by a cut line. The indentation area has an upper edge, a lower edge and an indentation line. An upper edge is provided below and adjacent to the separable zone. The upper edge consists of a score line of severable zones. The lower edge is provided as a score line below the upper edge. Both ends of the lower edge coincide with both ends of the upper edge in the longitudinal direction. The push line consists of a score line connecting the upper edge and the lower edge. According to the invention disclosed in Patent Literature 1, the sealing adhesive tape can be easily peeled off including the pressing of the pressing portion.

Patent Literature 2 discloses a cardboard box. This corrugated cardboard box includes a rectangular tubular portion, a pair of outer flaps, a pair of top side inner flaps, a pair of bottom side outer flaps, and a pair of bottom side inner flaps. The rectangular tubular portion has one opposing wall, the other opposing wall, and a pair of opposing left and right side walls. A top side outer flap extends from each upper edge of the one opposing wall and the other opposing wall. A top inner flap extends from each upper edge of each sidewall. A bottom side outer flap extends from each bottom edge of the one opposing wall and the other opposing wall. A bottom inner flap extends from each lower edge of each sidewall. This corrugated box is assembled from a single sheet of corrugated board. A separable zone is provided at the top center of the side wall. At least a lower portion of this separable zone is a first score line. A portion other than the first cut line is surrounded by a fracture guide line. A second score line is formed in the sidewall. A second score line extends downward from the center of the first score line. According to the invention disclosed in Patent Literature 2, the stuck adhesive tape can be easily peeled off regardless of the amount of stored products and without damaging the stored products.

Utility Model Registration No. 3214314 Utility Model Registration No. 3164053

However, the inventions disclosed in Patent Documents 1 and 2 have the problem that a certain amount of force is required to separate the separable region from the corrugated cardboard box.

The present invention solves the problems mentioned above. The object is to provide a cardboard box that reduces the force required to separate the separable areas.

A cardboard box of the present invention will be described with reference to the drawings. The reason why the symbols in the drawings are used in this column is to facilitate understanding of the content of the invention, and is not intended to limit the content to the illustrated range.

In order to solve the above-described problems, according to one aspect of the present invention, the cardboard box 30 includes an open side wall forming portion 40, a pair of opposed outer peripheral surface forming flaps 42 and 44, and a bottom forming portion 46. The opening side wall forming part 40 forms the side walls and the opening. The bottom surface forming portion 46 continues to the opening side wall forming portion 40 to form a bottom surface. The opening side wall forming portion 40 has a pair of base walls 60, 62 that are opposed and form different parts of the side walls, and a pair of side walls 64, 66 that are opposed and form different parts of the side walls. Base walls 60, 62 and side walls 64, 66 have opening-forming edges 80, 82, 84, 86, respectively. Aperture forming edges 80, 82, 84, 86 are different portions of the edge of the aperture. One of the pair of outer peripheral surface forming flaps 42 and 44 extends bendably from one opening forming edge 80 of the pair of base walls 60 and 62 . The other of the pair of outer peripheral surface forming flaps 42 and 44 extends bendably from the other opening forming edge 82 of the pair of base walls 60 and 62 . At least one of the pair of side walls 64 , 66 has a severable zone 92 and a fracture induction zone 94 . The separable region 92 is arranged on the bottom surface forming portion 46 side when viewed from the positions of the ends of the pair of outer peripheral surface forming flaps 42 and 44 when the pair of outer peripheral surface forming flaps 42 and 44 are in contact with each other. The break-inducing zone 94 is adjacent to the severable zone 92 and separates the severable zone 92 from the perimeter of the severable zone 92 . The break-inducing zone 94 has a lower mechanical strength than the severable zone 92 . The cardboard box 30 is constructed from corrugated paper 32 . The opening-forming edges 84,86 of the side walls 64,66 with the separable zone 92 have opposite end abutments 108. As shown in FIG. Both end adjacent locations 108 are locations adjacent to both ends of the pair of outer peripheral surface forming flaps 42 and 44 when the pair of outer peripheral surface forming flaps 42 and 44 are in contact with each other. A two-end abutment point 108 is a point at either end of the corrugated board. A severable zone 92 and a break-inducing zone 94 abut opposite end abutment points 108 .

A severable zone 92 abuts both end abutments 108 . Both end adjacent locations 108 are locations adjacent to both ends of the pair of outer peripheral surface forming flaps 42 and 44 when the pair of outer peripheral surface forming flaps 42 and 44 are in contact with each other. As a result, the pair of outer peripheral surface forming flaps 42 and 44 are in contact with each other, and the adhesive tape 300 is adhered from the pair of outer peripheral surface forming flaps 42 and 44 that are in contact with each other to the separable region 92. When the adhesive tape 300 is in place, the adhesive tape 300 can be easily peeled off by separating the separable region 92 from the side walls 64,66. The break-inducing zone 94 is adjacent to the severable zone 92 and separates the severable zone 92 from the perimeter of the severable zone 92 . A severable zone 92 and a break-inducing zone 94 abut opposite end abutment points 108 . A two-end abutment point 108 is a point at either end of the corrugated board. As a result, when separating the separable region 92 from the side walls 64 and 66, it is not necessary to break the portion of the break guide region 94 that is reinforced by the adhesive tape 300. FIG. Since it is no longer necessary to break the portion of the breakage induction region 94 reinforced by the adhesive tape 300, the force required for breaking the portion becomes unnecessary. As a result, the force required to separate the separable region 92 can be reduced.

Further, it is desirable that the corrugated paper forming the separable region 92 described above has a corrugated core material 140 . A wavy core 140 extends from one of the pair of base walls 60, 62 toward the other. In this case, it is desirable that the fracture induction zone 94 has a pair of linear portions 100,100. The pair of linear portions 100, 100 sandwiches the separable region 92 and touches both ends adjacent portions 108, respectively. The pair of linear portions 100, 100 extends in a direction intersecting the direction from one of the pair of base walls 60, 62 to the other.

A wavy core 140 extends from one of the pair of base walls 60, 62 toward the other. The pair of linear portions 100, 100 sandwiches the separable region 92 and touches both ends adjacent portions 108, respectively. The pair of linear portions 100, 100 extends in a direction intersecting the direction from one of the pair of base walls 60, 62 to the other. As a result, the separable region 92 is easier to turn up than when the wavy core member 140 extends from the bottom surface forming portion 46 toward the opening forming edges 80 , 82 , 84 , 86 . When the separable region 92 is easily turned up, stress concentration is likely to occur in the fracture induction region 94 when a force is applied to separate the separable region 92 from the side walls 64 and 66 . When stress concentration is more likely to occur in the fracture induction zone 94, it becomes easier to separate the separable zone 92 from the side walls 64,66.

It is also desirable that both of the pair of outer peripheral surface forming flaps 42 and 44 described above have respective extensions 110 . The extensions 110 extend from the ends of the perimeter flaps 42, 44 that are adjacent to the end abutment points 108 when the pair of perimeter flaps 42, 44 abut each other. The extension 110 is positioned within the opening side wall forming portion 40 when the pair of outer peripheral surface forming flaps 42, 44 abut each other. In this case, it is desirable that the surfaces of the outer peripheral surface forming flaps 42 and 44 and the surface of the extension portion 110 are integrally connected.

The surfaces of the outer peripheral surface forming flaps 42 and 44 and the surface of the extension portion 110 are integrally connected. As a result, immediately after the separable region 92 is separated from the side walls 64, 66, the surface layer portions of the outer peripheral surface forming flaps 42, 44 together with the adhesive tape 300 adhered to the outer peripheral surface forming flaps 42, 44 are separated from the outer peripheral surface forming flaps 42, 44. The risk of detachment from the face forming flaps 42, 44 is reduced. If the risk is reduced, the risk that the aesthetic appearance of the cardboard box 30 will be spoiled by peeling off the adhesive tape 300 is also reduced.

The cardboard box according to the present invention can reduce the force required to separate the separable area.

1 is a perspective view of a cardboard box according to an embodiment of the invention; FIG. 1 is an exploded view of a corrugated board for forming a corrugated box according to an embodiment of the invention; FIG. 1 is a perspective view of one side wall of a cardboard box according to an embodiment of the invention; FIG. 1 is a perspective view of the vicinity of an end of one side wall of a corrugated cardboard box according to an embodiment of the present invention; FIG. FIG. 2 shows a cardboard box during assembly according to an embodiment of the invention; 1 is a perspective view of a fully assembled cardboard box according to an embodiment of the present invention; FIG. FIG. 4 is a diagram showing a situation in which a finger is placed on the detachable area of the corrugated cardboard box according to an embodiment of the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described based on the drawings. In the following description, the same parts are given the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

[Construction of cardboard box]
FIG. 1 is a perspective view of a cardboard box 30 according to this embodiment. FIG. 2 is a developed view of corrugated cardboard 32 for forming the corrugated cardboard box 30 according to this embodiment. The configuration of the corrugated cardboard box 30 according to the present embodiment will be described based on FIGS. 1 and 2. FIG.

As is clear from FIG. 1, the cardboard box 30 according to the present embodiment includes an opening side wall forming portion 40, one outer peripheral surface forming flap 42, the other outer peripheral surface forming flap 44, a bottom surface forming portion 46, and four and an inner reinforcing portion 48 . As can be seen from FIG. 2, the corrugated box 30 shown in this embodiment is assembled from a single sheet of corrugated board 32 .

An open side wall formation 40 forms a space for storing optional items (not shown). The opening side wall forming portion 40 according to this embodiment has a one base wall 60 , another base wall 62 , one side wall 64 , and the other side wall 66 . The one-side base wall 60 is a side wall forming the base of the one-side outer peripheral surface forming flap 42 . The other base wall 62 is a side wall forming the base of the other outer peripheral surface forming flap 44 . The one base wall 60 and the other base wall 62 face each other. In the present embodiment, the one base wall 60 and the other base wall 62 are collectively referred to as "a pair of base walls". One side wall 64 and the other side wall 66 are side walls arranged on the sides of the pair of base walls 60 and 62 . One side wall 64 and the other side wall 66 face each other. In this embodiment, the one side wall 64 and the other side wall 66 are collectively referred to as "a pair of side walls".

As best seen in FIG. 1, one base wall 60 has an aperture-forming edge 80 . The other base wall 62 has an opening-forming edge 82 . Side wall 64, on the other hand, has an opening-forming edge 84. As shown in FIG. The other side wall 66 has an opening-forming edge 86 . These opening forming edges 80 , 82 , 84 , 86 are different parts of the edges of the opening formed by the opening side wall forming portion 40 .

The outer peripheral surface forming flap 42 extends from the opening forming edge 80 of the one base wall 60 . The other outer peripheral surface forming flap 44 extends from the opening forming edge 82 of the other base wall 62 . In the present embodiment, the one outer peripheral surface forming flap 42 and the other outer peripheral surface forming flap 44 are collectively referred to as "a pair of outer peripheral surface forming flaps".

In this embodiment, both of the pair of outer peripheral surface forming flaps 42 and 44 have extensions 110 . As is clear from FIG. 1, in this embodiment, the extensions 110 extend from the ends of the pair of outer peripheral surface forming flaps 42,44. In this embodiment, the surfaces of the outer peripheral surface forming flaps 42 and 44 and the surface of the extension portion 110 are integrally connected.

The bottom surface forming portion 46 forms the bottom surface of the cardboard box 30 according to this embodiment. The bottom surface forming portion 46 forms a space for accommodating the above-described articles (not shown) together with the opening side wall forming portion 40 . In this embodiment, the bottom surface forming portion 46 is integrally connected to the opening side wall forming portion 40 .

The inner reinforcing portion 48 extends from a side edge 130 contacting the one side wall 64 and a side edge 130 contacting the other side wall 66 of the one base wall 60 and the other base wall 62 . The inner reinforcing portion 48 is arranged in the space formed by the opening side wall forming portion 40 .

FIG. 3 is a perspective view of one side wall 64 of the cardboard box 30 according to this embodiment. The configuration of the side walls 64, 66 of the corrugated cardboard box 30 according to this embodiment will be described based on FIG.

In this embodiment, the opening-forming edge 84 of one side wall 64 consists of either end of the corrugated board 32 described above. In this embodiment, the opening edge 86 of the other side wall 66 also consists of either end of the corrugated board 32 described above.

In this embodiment, one side wall 64 has a severable zone 92 and a break-inducing zone 94 in addition to the opening-forming edge 84 . The side wall 66 on the other hand has a severable zone 92 and a break-inducing zone 94 in addition to the opening forming edge 86 .

As can be seen from FIG. 3, the separable area 92 is positioned to underlie both ends of the pair of perimeter flaps 42, 44 when the pair of perimeter flaps 42, 44 abut each other. As a result, the separable region 92 is arranged on the bottom surface forming portion 46 side when viewed from the positions of the ends of the pair of outer peripheral surface forming flaps 42 and 44 . The break-inducing zone 94 is adjacent to the severable zone 92 and separates the severable zone 92 from the perimeter of the severable zone 92 . The break-inducing zone 94 has a lower mechanical strength than the severable zone 92 .

In this embodiment, the fracture induction zone 94 has a pair of linear portions 100,100. A pair of linear portions 100 , 100 are arranged so as to sandwich the separable region 92 . The pair of linear portions 100, 100 extend in a direction that intersects the direction from one side of the one base wall 60 and the other base wall 62 to the other side. The pair of linear portions 100, 100 extend linearly along each other. In the case of this embodiment, the pair of linear portions 100 , 100 are connected to the interconnecting portion 102 . The interconnection 102 is carried by the bottom forming portion 46 . The pair of linear portions 100, 100 of the fracture induction region 94 of the other side wall 66 are also connected to the interconnecting portion 102 of the bottom surface forming portion 46. As shown in FIG. That is, in this embodiment, the bottom forming portion 46 has a pair of interconnecting portions 102,102.

In addition, in the case of this embodiment, the structure of the linear portion 100 and the interconnecting portion 102 is the same as a well-known perforation. Therefore, its detailed description is not repeated here.

In this embodiment, the opening-forming edge 84 of one side wall 64 has opposite end abutments 108 . The opening edge 86 of the other side wall 66 also has opposite end abutments 108 . Both end adjacent locations 108 are locations adjacent to both ends of the pair of outer peripheral surface forming flaps 42 and 44 when the pair of outer peripheral surface forming flaps 42 and 44 are in contact with each other. As mentioned above, in this embodiment the opening-forming edge 84 of one side wall 64 consists of either end of the corrugated board 32 described above. On the other hand, the opening-forming edges 86 of the side walls 66 also consist of either end of the corrugated board 32 described above. Both ends abutment 108 thereby consist of either end of corrugated board 32 . A severable zone 92 and a break-inducing zone 94 abut opposite end abutment points 108 . Accordingly, one end of each of the linear portions 100 and 100 is in contact with the two-end adjacent portion 108 . Further, the extension portion 110 extends from the end of the pair of outer peripheral surface forming flaps 42 and 44 that is adjacent to the both end adjoining portion 108 when the flaps 42 and 44 contact each other.

FIG. 4 is a perspective view of the vicinity of the end of one side wall 64 of the cardboard box 30 according to this embodiment. Based on FIG. 4, the structure of the corrugated paper 32 in the one side wall 64 according to this embodiment will be described.

In this embodiment, the corrugated paperboard 32 forming one side wall 64 has a corrugated core 140 , a front liner 142 and a back liner 144 . A wave-like core member 140 extends from one of the one base wall 60 and the other base wall 62 toward the other. The front liner 142 is arranged on the outer peripheral side of the opening side wall forming portion 40 when viewed from the position of the corrugated core material 140 . The back liner 144 is arranged on the inner peripheral side of the opening side wall forming portion 40 when viewed from the position of the corrugated core material 140 .

[How to use a cardboard box]
A person who intends to use the cardboard box 30, i.e., a worker, puts an article (not shown) to be stored in the cardboard box 30 on the part of the cardboard 32 in the state shown in FIG. put on. When it is placed, the worker bends the part that will become the inner reinforcing part 48 and that is connected to the part that will become the one base wall 60 so that they stand up.

When those portions are bent, the worker bends the portion between the portion to be the one base wall 60 and the portion to be the bottom surface forming portion 46 so that the portion to be the one base wall 60 is raised.

Next, the operator folds the portions that are to be the extended portions 110 and are connected to both ends of the portion that is to be the outer peripheral surface forming flap 42 so that they face each other.

Next, the worker falls down between the portion that will be the one base wall 60 and the portion that will be the one outer peripheral surface forming flap 42 toward the portion that will be the bottom surface forming portion 46 where the one outer peripheral surface forming flap 42 will be. Bend. FIG. 5 shows the cardboard box 30 during this assembly. However, the items intended to be contained in the cardboard box 30 are not shown in FIG.

Next, the worker similarly folds the portion that will become the other base wall 62 and the portion that will become the other outer peripheral surface forming flap 44 .

Next, the worker folds the portions that will become the one side wall 64 and the other side wall 66 so that they stand up. Once these are folded, the operator places the end of extension 110 between side wall 64 and inner reinforcement 48 . The operator inserts the end of the extension 110 between the other side wall 66 and the inner reinforcement 48 . Subsequently, the operator lays down the one outer peripheral surface forming flap 42 and the other outer peripheral surface forming flap 44 . As a result, the extensions 110 enter between the one side wall 64 and the inner reinforcing portion 48 or between the other side wall 66 and the inner reinforcing portion 48, respectively. The tip of one outer peripheral surface forming flap 42 and the tip of the other outer peripheral surface forming flap 44 are opposed to each other. Further, the extension portion 110 is arranged in the opening side wall forming portion 40 when the tip of the one outer peripheral surface forming flap 42 and the tip of the other outer peripheral surface forming flap 44 are in contact with each other.

Next, the operator sticks the adhesive tape 300 directly above the tip of the one outer peripheral surface forming flap 42 and the other outer peripheral surface forming flap 44 facing each other so as to straddle them. This completes the assembly of the corrugated cardboard box 30 according to the present embodiment. FIG. 6 is a perspective view of the cardboard box 30 that has been assembled. In FIG. 6, the articles contained in the cardboard box 30 are not shown.

When trying to remove an article from the corrugated cardboard box 30 that has been assembled, a person who intends to do so, i.e., a remover, places his or her index finger or the like on the portion of the bottom forming portion 46 that is surrounded by the interconnecting portion 102. to break the interconnect 102 . At the same time, the taker places his/her thumb on the separable area 92 to which the adhesive tape 300 is applied. FIG. 7 is a diagram showing the situation. The remover then grasps the separable area 92 with his index finger and thumb and pulls it up. This separates the separable area 92 from the one side wall 64 . The taker peels off the adhesive tape 300 with the separable area 92 attached to the edge from the cardboard box 30. - 特許庁When the adhesive tape 300 is peeled off from the cardboard box 30, it becomes possible to take out the objects contained in the cardboard box 30. - 特許庁

[Explanation of effect]
As described above, the cardboard box 30 according to the present embodiment can reduce the force required to separate the separable region 92 .

Moreover, in the corrugated cardboard box 30 according to the present embodiment, it is less likely that the appearance of the corrugated cardboard box 30 will be spoiled due to the peeling of the adhesive tape 300 .

[Explanation of modification]
The cardboard box 30 described above is an example for embodying the technical idea of the present invention. The shape, structure, arrangement, etc. of each member are not limited to those of these embodiments. Various changes can be made to the shape, structure, and arrangement of each member.

For example, one side wall 64 and the other side wall 66 may not have the separable area 92 . In that case, the side wall 64 and the side wall 66 that do not have the separable area 92 need not be formed from either end of the corrugated board 32 . A flap may extend from the opening forming edges 84 , 86 of the one side wall 64 and the other side wall 66 that do not have the separable area 92 . Further, portions of the opening forming edges 84 and 86 of the one side wall 64 and the other side wall 66 other than the both end adjoining portions 108 may not consist of either end of the corrugated board 32 . In that case, flaps may extend from opening edges 84 and 86 that do not form either end of corrugated board 32 . Also, one of the pair of outer peripheral surface forming flaps 42 and 44 may not have the extended portion 110 . The corrugated cardboard box according to the present invention may not have the inner reinforcing portion 48 . The direction in which the corrugated core 140 of the corrugated paper 32 extends is not limited to the above.

Moreover, in the present invention, the form of the bottom surface forming portion 46 is not limited to the one described above. For example, the bottom formation may be a plurality of flaps stacked together in a known manner.

Moreover, in the present invention, the form of the fracture induction zone 94 is not limited to the one described above. For example, the pair of linear portions 100, 100 may be curvilinear. The break-inducing zone 94 may have low mechanical strength other than the well-known perforations that are easily broken under force.

30 Corrugated cardboard box 32 Corrugated paper 40 Opening side wall forming portion 42 One outer peripheral surface forming flap 44 Other outer peripheral surface forming flap 46 Bottom surface forming portion 48 Inner reinforcing portion 60 One base wall 62 Other base wall 64 One side wall 66 Other side walls 80, 82, 84, 86 Opening forming edge 92 Separable region 94 Fracture induction region 100 Linear portion 102 Mutual connection portion 108 Both ends adjacent portion 110 Extension portion 140... Core material 142... Front liner 144... Back liner 300... Adhesive tape

Claims (3)

an opening sidewall forming portion that forms the sidewall and the opening;
a pair of opposing outer peripheral surface forming flaps;
a bottom surface forming portion connecting to the opening side wall forming portion and forming a bottom surface;
The opening side wall forming portion is
a pair of base walls that face each other and form different portions of the side walls;
a pair of opposing side walls each forming a different portion of the side walls;
the base wall and the side wall each having an opening forming edge that is a different part of the edge of the opening;
one of the pair of outer peripheral surface forming flaps bendably extends from the opening forming edge of one of the pair of base walls;
the other of the pair of outer peripheral surface forming flaps bendably extends from the other opening forming edge of the pair of base walls;
At least one of the pair of side walls,
a separable region disposed on the bottom surface forming portion side when viewed from the positions of both ends of the pair of outer peripheral surface forming flaps when the pair of outer peripheral surface forming flaps are in contact with each other;
a fracture induction region adjacent to the separable region and separating the separable region from the periphery of the separable region and having a mechanical strength lower than that of the separable region;
A corrugated box constructed from corrugated paper,
said opening forming edge of said side wall having said severable zone having opposite end abutments;
The both-ends adjacent locations are locations adjacent to both ends of the pair of outer peripheral surface forming flaps when the pair of outer peripheral surface forming flaps are in contact with each other, and which are composed of either end of the corrugated cardboard,
A corrugated cardboard box, wherein the separable region and the break-inducing region are in contact with the adjoining portions on both ends. The corrugated paper forming the separable area has a wavy core material extending from one of the pair of base walls toward the other;
The rupture-inducing region sandwiches the severable region, is in contact with the two-end adjacent portions, and extends in a direction that intersects the direction from one of the pair of base walls to the other. The corrugated box of claim 1, comprising: Both of the pair of outer peripheral surface forming flaps extend from the ends of the outer peripheral surface forming flaps adjacent to the both end adjoining portions when the pair of outer peripheral surface forming flaps are in contact with each other, and the pair of outer peripheral surface forming flaps are mutually each having an extension positioned within the opening sidewall formation when they meet;
2. The corrugated cardboard box according to claim 1, wherein the surface of said outer peripheral surface forming flap and the surface of said extension are integrally connected.

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