JP3154972U - Cardboard box - Google Patents

Abstract

A corrugated cardboard box is provided which can easily peel off a sticky adhesive tape while maintaining high strength against compression in the vertical direction. A rectangular cylindrical portion having a front wall 2 and a rear wall 3 facing each other and a pair of left and right side walls 4 facing each other, and a pair of upper side outer flaps 5 extending from respective upper edges of the front wall and the rear wall. A pair of upper surface side inner flaps extending from the upper edges of the side walls, a pair of lower surface side outer flaps 7 extending from the lower edges of the front and rear walls, and the lower edges of the side walls. A rectangular cardboard box having a pair of lower side inner flaps 8 that extend, each of which is assembled from a single piece of corrugated paper, with a break guide wire 10 at the upper center of the side wall. An enclosed tongue-shaped separable region 11 is provided. [Selection] Figure 1

Description

  The present invention relates to a cardboard box assembled from corrugated paper, and more particularly to a cardboard box from which an adhesive tape such as an OPP tape can be easily peeled off.

  Corrugated cardboard boxes are used as containers for storing a plurality of commodities collectively from transportation of goods to display, or as packaging containers for selling heavy goods such as home appliances and potted plants. The cardboard box is a state in which the bottom flap is formed in advance and the bottom part is formed, and after storing the product or the like inside the box, the pair of top side inner flaps and the pair of top side outer flaps are folded in order. Sealing is generally performed by sticking an adhesive tape from the butted portion to the left and right side walls.

  However, in the case of a conventional cardboard box, in order to open the sealed cardboard box, it is necessary to raise the end of the tape by peeling off the tape by placing a nail or the like on the end of the adhesive tape. There is a disadvantage that it takes time and effort. In particular, OPP (stretched polypropylene) pressure-sensitive adhesive tape, which has been widely used in recent years because of its low cost, is formed relatively thin because of its excellent strength, and its adhesive strength is also high. It is extremely difficult to cause.

  Conventionally, the cardboard box is also opened by cutting the adhesive tape using a cutter knife or the like. However, in this case, it is necessary to handle the cutter knife with care, and there is a risk of damaging the goods stored by the cutter knife. In addition, even when opened using a cutter knife or the like in this way, when re-pulping the cardboard paper to recycle the cardboard box, it is necessary to remove the adhesive tape remaining in the cardboard box. There is no change in taking the time and effort to peel off.

  Therefore, as a corrugated cardboard box in which the adhesive tape can be easily peeled off, it has a structure in which a part of the corrugated cardboard box can be separated by providing a cut in the side wall portion where the end of the adhered adhesive tape is normally located. Has been proposed (see, for example, JP 2007-8529 A). This cardboard box can be easily peeled off by peeling off the adhesive tape together with the cut-off portion. However, when the cut is simply made in the side wall of the cardboard box in this way, there arises a disadvantage that the vertical compressive strength of the cardboard box is lowered due to the cut. Corrugated cardboard boxes are often stacked many times when a large amount of heavy goods are transported, and this reduction in longitudinal strength is a major concern in commodity logistics. In view of this, a cardboard box with a narrow cut area has also been proposed (see, for example, Japanese Patent Application Laid-Open No. 2004-175451). However, this corrugated cardboard box can relatively prevent the decrease in the compressive strength, but it becomes difficult to easily separate the separating portion even when the separating portion is pulled.

JP 2007-8529 A JP 2004-175451 A

  The present invention has been made in view of these disadvantages, and an object of the present invention is to provide a corrugated cardboard box that can easily peel off the attached adhesive tape while maintaining high strength against compression in the vertical direction. .

The idea made to solve the above problems is
A rectangular tubular portion having opposing front and rear walls and a pair of opposing left and right side walls;
A pair of upper surface side outer flaps extending from the respective upper edges of the front wall and the rear wall;
A pair of upper surface side inner flaps extending from each upper edge of each side wall;
A pair of lower side outer flaps extending from the lower edges of the front and rear walls;
A pair of lower side inner flaps extending from each lower edge of each side wall,
A cardboard box in which these rectangular tubular parts and each flap are assembled from a single cardboard paper,
In the upper center of the side wall, a tongue-like separable region surrounded by a fracture guide line is provided.

  Since the corrugated cardboard box has a separable area surrounded by a fracture guide line at the upper center of the side wall, the corrugated box body (side wall) can be securely and easily separated along the fracture guide line. ). In addition, since the separable area is formed in the upper center of the side wall, when the adhesive tape is usually attached to the abutting portion of the pair of upper surface side outer flaps, the end of this adhesive tape is on the separable area. Can be located. Therefore, according to the corrugated cardboard box, the end of the adhesive tape is peeled off from the cardboard box together with the separation of the separable area by being attached so that the end of the adhesive tape is positioned on the separable area. The entire adhesive tape is easily peeled off with the end of the adhesive tape as the head. Therefore, according to the corrugated cardboard box, the adhesive tape can be easily peeled without forcibly peeling off the nail or the like on the end of the adhesive tape.

  It is preferable that the breaking guide line has an upper side disposed substantially parallel to the upper edge of the side wall and a curved line extending downward from both ends of the upper side. According to the corrugated cardboard box, the upper side forming a part of the separable area and the upper edge of the side wall are formed in parallel, so that the vertical direction of the separable area (direction perpendicular to the upper side) ) And the longitudinal direction of the corrugated cardboard box coincide with each other, and it is possible to prevent the compressive strength of the corrugated cardboard box from being lowered by providing this separable area on the side wall. Further, according to the corrugated cardboard box, since the upper side of the breaking guide line is provided substantially parallel to the upper edge of the side wall, the upper side of the breaking guide line does not affect the compressive strength in the vertical direction. Therefore, according to the cardboard box, the compressive strength in the vertical direction can be maintained. Therefore, according to the corrugated cardboard box, even though the separable area is formed as an area surrounded by the break guide line, the cardboard box has high strength against the compression in the vertical direction, and for example, corrugated cardboard packed with heavy goods. Even if the boxes are stacked and used in several stages, they have the same strength as ordinary cardboard boxes, so that the shape can be maintained without deformation and the contents can be protected.

  The corrugated paper has a corrugated core, a front liner laminated on the front surface side of the core, and a back liner laminated on the back surface side of the core, and the upper side of the breaking guide line is the middle It is preferable that the core and the back liner are cut, and at least a part of the curved line is cut in a perforated shape.

  According to the corrugated box, the upper side of the breakage guide line has the core and the back liner cut, that is, only the front liner remains. It can be easily bent outward or inward with the part as the center, and as a result, the front liner also tears easily when peeled off, so the separable area can be easily and reliably separated from the side wall (cardboard box body). Can do.

  Further, according to the corrugated cardboard box, at least a part of the curved line is cut in a perforated shape, and therefore, when the separable area is pushed in or grasped and peeled off, the curved line can be separated along the curved line. With this, a part of the adhesive tape can be surely peeled off. In addition, according to the corrugated cardboard box, it is possible to maintain a certain compressive strength by providing at least a part of the curved line in a perforated manner in this way, and therefore it is possible to prevent a decrease in strength.

  The connecting portion between the upper side of the breaking guide line and the curved line may be rounded. According to the corrugated cardboard box, the connecting portion between the upper side of the breaking guide line and the curved line is rounded, and at the time of peeling, the connecting portion can be linearly separated along the breaking guide line. Can be prevented from being divided, and can be reliably peeled off along the shape of the separable region. Furthermore, since the connecting portion is rounded, the pressure is not concentrated on the compression of the corrugated paper in the vertical direction at the connecting portion, but the pressure is not concentrated, and therefore, it is surrounded by a breaking guide line. Even though the separable area is provided, the strength can be prevented from decreasing.

  In the present invention, the “breaking guide line” means a line provided with a cut so as to be broken along a predetermined shape, and is completely cut from the front surface to the back surface and completely from the front surface to the back surface. Includes both uncut lines. Examples of the break-inducing line that is not completely cut from the front surface to the back surface include, for example, perforated lines (lines in which the cut and non-cut portions are repeated alternately), and layered layers such as liners and cores. For example, a line obtained by cutting only a part of the layer of the corrugated cardboard is used.

  As described above, according to the corrugated cardboard box of the present invention, it is possible to easily peel off the adhered adhesive tape while maintaining high compressive strength in the vertical direction.

The expanded view which shows the cardboard box which concerns on one Embodiment of this invention The perspective view which shows the cardboard box of FIG. Partial sectional view showing the corrugated paper of the cardboard box of FIG. Partial side view showing the separable area of the cardboard box of FIG. 1 is a schematic cross-sectional view (a) showing a side wall including a separable area of the cardboard box of FIG. 1, a schematic cross-sectional view (b) showing a state where the separable area is being separated, and a separable area being separated. Schematic sectional view (c) showing the state The perspective view which shows the state in the middle of opening of the cardboard box of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.

  The corrugated cardboard box 1 shown in FIGS. 1 and 2 extends from a rectangular cylindrical portion having a front wall 2 and a rear wall 3 facing each other and a pair of left and right side walls 4 facing each other and upper edges of the front wall 2 and the rear wall 3. A pair of upper surface side outer flaps 5 that protrude, a pair of upper surface side inner flaps 6 that extend from the upper edges of the side walls 4, and a pair of lower surfaces that extend from the lower edges of the front wall 2 and the rear wall 3 A side outer flap 7 and a pair of lower surface side inner flaps 8 extending from each lower edge of each side wall 4 are provided.

  The cardboard box 1 is formed in a rectangular parallelepiped shape in a sealed state, and is formed using a single cardboard paper having a uniform thickness. The size of the cardboard box 1 is not particularly limited, and is set as appropriate in consideration of the size of the product as the contents. In addition, the fine line in the cardboard box 1 of FIG. 1 has shown the crease | fold, and it is preferable that the ruled line process which makes it easy to bend | fold is given to these crease | folds.

  The front wall 2 and the rear wall 3 have a rectangular shape of the same type and the same size. The pair of side walls 4 also has a rectangular shape of the same type and the same size. Further, the front wall 2, the rear wall 3, and the pair of side walls 4 are formed at an equal height, and thereby, a rectangular cylindrical portion having a rectangular parallelepiped shape is formed.

  The front wall 2 includes a margin portion 9 on a side edge of the pair of side edges that is not in contact with the side wall 4. According to the glue margin 9, when forming the rectangular tubular portion, the glue margin 9 is bonded to the inner surface of the side wall 4 so that the side edge of the other side wall 4 and the side edge of the front wall 2 are in contact with each other. By doing so, the rectangular cylindrical portion can be fixed in a cylindrical shape.

  In the corrugated cardboard box 1, after forming the rectangular cylindrical portion, the lower surface side inner flap 8 is folded at a right angle inside the rectangular cylindrical portion, and the lower surface side outer flap 7 is then folded at a right angle inside the rectangular cylindrical portion. The bottom can be completed. At this time, the front end edges of the lower surface side outer flap 7 are butted together, and the bottom of the cardboard box 1 is fixed by sticking an adhesive tape from the butted portion to the lower portions of the side walls 4.

  As the corrugated cardboard forming the corrugated cardboard box 1, as shown in FIG. 3, a front liner laminated on the surface side of the corrugated core 1a from the viewpoint of high strength and easy processing and forming. A double-sided cardboard including 1b and a back liner 1c laminated on the back side is used. At this time, the ridge direction of the wave of the center core 1a is set to be the vertical direction of the square cylindrical portions (the front wall 2, the rear wall 3, and the side wall 4) so as to have particularly high strength against the pressure in the vertical direction. Designed.

  The corrugated cardboard box 1 has a tongue-like separable area 11 surrounded by a break guide wire 10 (10a and 10b) as shown in an enlarged view in FIG. ing.

  Since the corrugated cardboard box 1 has the separable region 11 surrounded by the breaking guide wire 10 in the upper center of the side wall 4 in this way, the cardboard box 1 is surely and easily separated along the breaking guide wire 10. The possible area 11 can be separated from the main body (side wall 4) of the cardboard box 1. Further, since the separable region 11 is formed at the upper center of the side wall 4, as shown in FIG. 2, when the adhesive tape T is usually attached to the butted portion of the pair of upper surface side outer flaps 5, The end of the adhesive tape T can be positioned on the separable area 11. Therefore, according to the corrugated cardboard box 1, the end of the adhesive tape T is separated together with the separation of the separable area 11 by being attached so that the end of the adhesive tape T is positioned on the separable area 11. Is peeled off from the cardboard box 1, and the entire adhesive tape T is easily peeled off starting from the end of the adhesive tape T. Therefore, according to the corrugated cardboard box 1, the adhesive tape T can be easily peeled without forcibly peeling the nail or the like on the end of the adhesive tape T.

  The break guide wire 10 has an upper side 10a disposed substantially parallel to the upper edge of the side wall 4, and a curved line 10b extending downward from both ends of the upper side 10a.

  According to the corrugated cardboard box 1, the upper side 10 a that forms the separable region 11 and the upper edge of the side wall 4 are formed in parallel. (The direction perpendicular to the upper side) and the longitudinal direction of the cardboard box 1 coincide with each other, and it is possible to prevent the compressive strength of the cardboard box 1 from being lowered by providing the separable area 11 on the side wall 4. Further, according to the corrugated cardboard box 1, since the upper side 10a of the breaking guide line 10 is provided substantially parallel to the upper edge of the side wall 4, the upper side 10a of the breaking guide line may affect the compressive strength in the vertical direction. Absent. Therefore, according to the cardboard box 1, the compressive strength in the vertical direction can be maintained. Therefore, according to the corrugated cardboard box 1, although the separable area 11 is formed as an area surrounded by the breaking guide line 10, the cardboard box 1 has high strength against compression in the vertical direction, for example, heavy goods. Even when used and stored in several layers, the shape can be maintained without deformation and the contents can be protected.

  The separable region 11 has a tongue-like shape including a grip portion 12 and a substantially semicircular finger insertion portion 13 extending downward from the grip portion 12.

  The shape of the gripping portion 12 is not particularly limited as long as the separable area 11 is a tongue piece shape, but is preferably a substantially semicircular shape or a substantially isosceles trapezoidal shape as shown in FIG. The size of the grip portion 12 is preferably a size that can be picked by hand and the adhesive tape T is sufficiently adhered to the surface. For example, in the case of a substantially semicircular shape, the radius is 1.5 cm or more and 4 cm. The following is preferred.

  The size of the finger insertion portion 13 needs to be a size that allows a single finger such as a middle finger to enter. For example, the radius is preferably 5 mm to 3 cm. If the size of the finger insertion portion 13 is smaller than the lower limit, it is difficult to insert a finger. Conversely, if the size of the finger insertion portion 13 is larger than the above upper limit, the strength of the cardboard box 1 will be reduced.

  The separable area 11 is in the shape of a tongue having a gripping portion 12 and a substantially semicircular finger insertion portion 13 extending downward from the gripping portion 12, so that the longitudinal direction (in the upper side 10 a) On the other hand, the structure is strong against compression in the vertical direction). Therefore, according to the corrugated cardboard box 1, although the separable region 11 is formed as a region surrounded by the breaking guide line 10, it is strong against compression in the vertical direction. It can withstand a certain degree even when used and stored. In addition, since the separable region 11 has a tongue-like shape, the tearable region 11 can be reliably torn along the breaking guide line 10 when tearing from the side wall 4.

  The size of the entire separable region 11 is not particularly limited, and is appropriately set according to the size of the pressure-sensitive adhesive tape normally used for sticking the cardboard box. For example, the length (width) of the upper side 10a of the separable area 11 is preferably equal to the width of the adhesive tape T usually used for a cardboard box, specifically, preferably 2 cm or more and 10 cm or less, 3 to 8 cm is particularly preferable. Thus, by making the length of the upper side 10a of the separable area 11 equal to or larger than the width of the adhesive tape normally used for a cardboard box, the end of the adhesive tape T can be reliably separated. 11 can be attached.

  Moreover, the thing whose upper side length of the separable area 11 is smaller than the width | variety of the adhesive tape used is also preferable. According to such a separable region 11, the adhesive tape is attached so as to cover the entire gripping portion 12, and therefore, a decrease in strength with respect to the vertical pressing force due to the provision of the break guide wire 10 is prevented. be able to. Furthermore, since the area of the separable area 11 is reduced by reducing the base length of the separable area 11 in this way, it is also possible to suppress a decrease in the compressive strength in the longitudinal direction.

  The height of the separable area 11 (the length in the direction perpendicular to the upper side 10a) is preferably, for example, 3 cm to 10 cm, and particularly preferably 5 cm to 8 cm. If the height of the separable area 11 is smaller than the lower limit, it becomes necessary to consciously stick the end of the adhesive tape T onto the separable area 11, and workability is lowered. Moreover, it becomes easy to produce the case where the edge part of the adhesive tape t cannot be stuck on the separable area | region 11, and in this case, this separable area 11 will not be cut off with the adhesive tape T. On the other hand, if the height of the separable area 11 is larger than the above upper limit, the adhesive tape T is easily peeled off, but the area surrounded by the break guide line 10 becomes wide. The compressive strength in the longitudinal direction will decrease.

  In the breaking guide line 10, the core 1a and the back liner 1c are cut at the upper side 10a (the state where the front liner 1b remains without being cut: see FIG. 5A), and at least a part of the curved line 10b. Is cut in perforations. Further, the breakage guide line 10 is completely cut off at the lower vertex portion 10c of the curved line 10b (the portion forming the finger insertion portion 13).

  According to the corrugated cardboard box 1, the upper side 10a of the breaking guide wire 10 is in a state where the core 1a and the back liner 1c are cut, that is, only the front liner 1b is left. The separable area 11 can be easily bent outwardly or inwardly with the upper side 10a as a center, and as a result, the front liner 1b is also easily torn when being peeled off. Can be separated from the side wall 4 (the main body of the cardboard box 1).

  Further, according to the corrugated cardboard box 1, since a part of the curved line 10b (a part other than the lower vertex part 10c) is cut in a perforation, when the separable area 11 is pushed in or grasped and peeled off Moreover, a part of the adhesive tape T can be reliably peeled off by being cut along the curved line 10b. In addition, according to the corrugated cardboard box 1, since a certain compressive strength can be maintained by providing at least a part of the curved line 10b in a perforated manner in this way, a decrease in strength can be prevented.

  Further, according to the corrugated cardboard box 1, the breaking guide wire 10 is completely cut at the lower vertex portion 10 c of the curved line 10 b (the portion forming the finger insertion portion 13). A finger can be easily inserted by pushing a finger such as a middle finger. When the finger is inserted into the finger insertion portion 13, the separable area 11 can be picked from both the front and back surfaces of the cardboard paper, and the gripping portion 12 having a certain area is picked and peeled off. The adhesive tape T easily peels off from the cardboard box 1 together with the separable area 11 and the separable area 11.

  The repetition length (pitch width) of the cutting line and the non-cutting line in the perforated portion of the curved line 10b is preferably 1 mm or more and 5 mm or less. When the pitch width in the curved line 10b is smaller than the lower limit, the compressive strength in the longitudinal direction is lowered. On the contrary, if the pitch width of the curved line 10b is larger than the above upper limit, the strength is strong, but it is difficult to break, so that it is difficult to separate the separable piece 11 from the side wall 4.

  A connecting portion 10d between the upper side 10a of the fracture guide line 10 and the curved line 10b is rounded as shown in FIG. According to the separable area 11, the connecting part 10 d is rounded in this way, so that the connecting part 10 in each separable area 11 can be rectilinear without being along the break guide line 10 when peeling off. Can be prevented, and can be reliably peeled off along the shape of the separable region 11. Furthermore, since the connecting portion 10d of the separable region 11 is rounded, the pressure is distributed along the rounded curve without concentrating the pressure against the pressing force in the vertical direction of the cardboard box 1. Even though the separable region 11 is provided, a decrease in strength can be prevented.

  Next, a method for using the cardboard box 1 will be described.

  As shown in FIG. 2, the cardboard box 1 is similar to a normal cardboard box in that a product is stored in the box with a bottom portion formed in advance, and then a pair of upper side flaps 6 and a pair of The upper surface side outer flap 5 is sequentially folded and sealed by adhering the adhesive tape T from the butt portion between the upper surface side outer flaps 5 to the upper part of the side wall 4.

  Since the separable area 11 is provided at the upper center of the side wall 4, the adhesive tape T is pasted so that the adhesive tape T is positioned on the surface of the separable area 11 as shown in FIGS. 2 and 5A. Worn. At this time, the finger insertion portion 13 of the separable area 11 is attached so as to be located outside the end of the adhesive tape T (the adhesive tape T does not cover the entire surface of the separable area 11). According to the high adhesive strength of the adhesive tape T, it is sufficient that the adhesive tape T is attached so that a part of the adhesive tape T is located on the surface of the separable area 11.

  The cardboard box 1 to which the adhesive tape T is attached can be easily opened by the following procedure. First, by pressing a finger such as a middle finger against the finger insertion portion 13, the finger insertion portion 13 is bent in the direction toward the inside of the cardboard box 1, and the finger is inserted therein. In the corrugated cardboard box 1, the lower vertex portion 10 c of the curved line 10 b forming the arc of the finger insertion portion 13 is completely cut, so that the finger insertion portion 13 can be easily bent without requiring a large force and Can be inserted. At this time, the entire separable region 11 including the grip portion 12 together with the finger insertion portion 13 may be bent once inside the cardboard box 1.

  Subsequently, by folding the finger insertion portion 13 and inserting the finger into the cardboard box 1, the gripping portion 12 of the separable area 11 is picked from both sides, and the cardboard box as shown in FIG. 5 (b). 1, and is bent around the upper side 10 a of the separable area 11. At this time, a part of the curved line 10b (parts other than the lower apex part 10c) forming both sides of the gripping portion 12 of the separable region 11 is cut in a perforated shape, and therefore easily along the perforated line. It is possible to tear the separable area 11. In the state shown in FIG. 5B, the separable area 11 and the side wall 4 are connected by a single front liner 1b.

  From the state in which the separable area 11 in FIG. 5B is bent, the front liner 1b is torn by further pulling the separable area 11 upward, and the separable area 11 is separated from the main body of the cardboard box 1. As shown in FIG. 5C, the upper side 10a of the separable region 11 is easily separated by tearing only the front liner 1b because the center core 1a and the back liner 1c are cut. At this time, since the end portion of the adhesive tape T is on the separable area 11, the adhesive tape T is peeled off from the surface of the cardboard box 1 together with the separable area 11 as shown in FIG.

  As described above, according to the corrugated cardboard box 1, it is not necessary to cause an end portion of the adhesive tape T having a strong adhesive force by raising a nail or the like, and the adhesive tape T can be easily peeled off along with the separation of the separable area 11. Further, according to the corrugated cardboard box 1, although the separable area 11 is provided, the separable area 11 has a high compressive strength because the separable area 11 has the above-described shape and the like.

  Note that the cardboard box of the present invention is not limited to the above embodiment, and for example, the separable areas 11 may be provided on both side walls. According to such a cardboard box, the adhesive tape stuck from either direction can be peeled off. Further, according to the corrugated cardboard box, by separating both the separable areas, the remaining hole portion from which the separable areas are separated can be used as a handle.

  Furthermore, in the break guide line forming the separable region, all the curved lines may be perforated break guide lines. That is, according to the corrugated cardboard box, the portion forming the arc of the finger insertion part is also a perforated breakage guide line, so that the compressive strength in the vertical direction can be maintained as high as that of a normal corrugated cardboard. it can.

  As described above, according to the cardboard box of the present invention, heavy goods and the like are accommodated and packed, and a pair of upper side outer flaps are sealed by sticking an adhesive tape, particularly an OPP tape having high adhesive strength. It is suitably used as a cardboard box.

DESCRIPTION OF SYMBOLS 1 Cardboard box 1a Center core 1b Front liner 1c Back liner 2 Front wall 3 Rear wall 4 Side wall 5 Upper surface side outer flap 6 Upper surface side inner flap 7 Lower surface side outer flap 8 Lower surface side inner flap 9 Glue margin 10 Breaking guide wire 10a upper side 10b curved line 10c lower vertex part 10d connecting part 11 separable area 12 gripping part 13 finger insertion part T adhesive tape

Claims (4)

A rectangular tubular portion having opposing front and rear walls and a pair of opposing left and right side walls;
A pair of upper surface side outer flaps extending from the respective upper edges of the front wall and the rear wall;
A pair of upper surface side inner flaps extending from each upper edge of each side wall;
A pair of lower side outer flaps extending from the lower edges of the front and rear walls;
A pair of lower side inner flaps extending from each lower edge of each side wall,
A cardboard box in which these rectangular tubular parts and each flap are assembled from a single cardboard paper,
A corrugated cardboard box having a tongue-like separable area surrounded by a break guide wire at the upper center of the side wall.   The cardboard box according to claim 1, wherein the breaking guide line has an upper side disposed substantially parallel to the upper edge of the side wall, and a curved line extending downward from both ends of the upper side. The corrugated paper has a corrugated core, a front liner laminated on the surface side of the core, and a back liner laminated on the back side of the core,
The corrugated cardboard box according to claim 1 or 2, wherein at the upper side of the break guide line, a core and a back liner are cut, and at least a part of the curved line is cut in a perforated shape.   The cardboard box according to claim 1, 2 or 3, wherein a connecting portion between the upper side of the breaking guide line and the curved line is rounded.

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