JPH11342934A - Packaging case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the strength of inserting sections by forming slits between peripheral walls on the side of short sides and folding sections, forming protrusions on the inserting section integrated with peripheral walls on the side of long sides and inserting the protrusions into the slits. SOLUTION: A packaging case is provided with slits 31 formed between peripheral walls 2 and 4 on the side of short sides and folding sections, and also provided with pawl-shaped protrusions 32 on the positions of the inserting sections 3a, 3b and 5b corresponding to the slits, and the protrusions 32 are inserted into the slits 31. That is, the packaging case is formed by adding protrusions 32 and slits 31 to packaging cases heretofore available, and the basic constitution is totally same as those of the packaging cases heretofore available. In brief, the shape of the packaging case at the time of completion is same as the shape heretofore available, and is a rectangular case without a top face (or a bottom face), and a reference face 1 forming a bottom face (or a top face) is provided, and four peripheral faces 2, 3, 4 and 5 are formed on the peripheral faces of the reference face.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging box made of cardboard or the like.

[0002]

BACKGROUND OF THE INVENTION Packaging boxes made of cardboard are commonly used for packing goods. This type of packaging box is formed by punching a flat corrugated cardboard, making a cut or fold to form a developed shape, and assembling this to form a box of a predetermined shape. The shape of the cardboard packaging box is J
It is defined by the IS standard.

[0003] Fig. 32 shows a packaging box of the "0422" type defined by the JIS standard. Further, the developed shape of the “0422” format is as shown in FIG. FIG.
It is a perspective view which shows the assembly procedure of 2 packaging boxes.

[0004] The packaging box 100 of the "0422" standard is shown in FIG.
As shown in Fig. 2, a rectangular box having no top surface (or bottom plate), having a reference surface 1 serving as a bottom plate (or top surface), and having four peripheral walls 2, 3, 4, 5 on its peripheral surface. It is.

As shown in FIG. 33, the unfolded shape of the packaging box 100 is centered on a rectangular member serving as a reference surface 1 (hereinafter, the rectangular member is simply referred to as a reference surface 1), and around the rectangular member,
A rectangular member that forms the peripheral walls 2, 3, 4, and 5 (hereinafter, the rectangular member is simply referred to as the peripheral walls 2, 3, 4, and 5) is provided. That is, the peripheral walls 2 and 4 on the short side are rectangular members having the same short side as the reference surface 1. Further, the peripheral walls 3 and 5 on the long side are rectangular members having the same long side as the reference surface 1. And between the reference plane 1 and the peripheral walls 2, 3, 4, 5
Fold lines 12, 13, 14, 15 are provided.
Further, a slit 20 is provided in the center between the reference surface 1 and the peripheral walls 2 and 4 on the short side. More specifically, a slit 20 is formed at the center of the fold lines 12, 14 of the peripheral walls 2, 4 on the short side.

Further, rectangular members 2a and 4a having the same shape are provided at the ends of the peripheral walls 2 and 4 on the short side via bending lines 21 parallel to the folding lines 12 and 14. The rectangular member constitutes a folded portion (hereinafter, the rectangular members 2a and 4a are combined with the folded portion 2).
a, 4a). A claw-shaped projection 23 is provided at the center of the distal end of each of the folded portions 2a and 4a.

On the other hand, on both sides of the peripheral walls 3 and 5 on the long side,
A substantially square member 3a, 3b, 5a, 5b is provided via a folding line 25 extending perpendicularly to the folding lines 13, 15.
Is provided. The square members 3a, 3b, 5
a, 5b constitute a sandwiching portion (hereinafter, square members 3a, 3b, 5a, 5b are sandwiched by the sandwiching portions 3a,
3b, 5a, 5b).

When assembling the packaging box 100, FIG.
, The surrounding walls 2, 3, 4, and 5 are each folded line 1
From 2,13,14,15, it is folded vertically to the reference plane 1. Then, the folded portions 2a and 4a are bent 180 degrees inward from the bending line 21. On the other hand, the sandwiching portions 3a, 3b, 5a, 5b are bent 90 degrees inward from the bending line 25. And sandwiching part 3
a, 3b, 5a, 5b are the peripheral walls 2, 4 and the folded portion 2
Both are folded in a state of being inserted between a and 4a. Further, the projections 23 provided at the tips of the folded portions 2a and 4a are inserted into the slits 20, and the packaging box 100 is completed.

[0009]

The prior art packaging boxes are:
It is standardized in JIS and used universally, but it cannot be said that rigidity is always sufficient.
In particular, in the packaging method called the see-through packaging where the box is attached to the bottom and top of the product and the middle part is exposed, high rigidity is required for the folded part, the sandwiched part and the ridge part of the packaging box, The structure of technology often lacks strength. Accordingly, the present invention is directed to the development of a packaging box having higher rigidity, focusing on the above-mentioned problems of the conventional technology.

[0010]

According to a first aspect of the present invention, there is provided a method for forming a reference surface which is bent from a developed shape and serves as a bottom surface or a top surface and a plurality of peripheral walls surrounding the reference surface. The packaging box provided, wherein one peripheral wall A
Is perpendicularly folded along a predetermined fold line from a reference plane, and further, the front end side of the peripheral wall A is bent at approximately 180 ° along a fold line parallel to the fold line, and overlaps with the peripheral wall A. A folded portion is formed, and at least one peripheral wall B adjacent to the peripheral wall A is vertically folded along a predetermined fold line from a reference plane, and a side surface portion of the peripheral wall B is connected to the fold line. In a packaging box that is bent along a bending line positioned vertically and is inserted between the peripheral wall A and the folded portion to form a sandwiching portion, a slit is formed between the peripheral wall A and the folded portion. A packaging box, wherein a projection is provided at a position corresponding to the slit of the sandwiching portion, and the projection is inserted into the slit.

The packaging box of the present invention is particularly effective in increasing the strength of the sandwiching portion and preventing the peripheral wall from opening. That is, the packaging box of the present invention has a slit between the peripheral wall A and the folded portion. A projection is provided on the sandwiching portion integrated with the peripheral wall B, and the projection is inserted into the slit. Therefore, in a state where the peripheral wall A and the peripheral wall B are configured in a box shape, the peripheral wall A and the peripheral wall B are engaged with each other by the projections and the slits, and can resist the force in the opening direction of the peripheral wall. In the present invention, the length of the sandwiching portion is arbitrary, and the sandwiching portion as described in the related art may be shorter than the peripheral wall A, and the sandwiching portion has the same length as the peripheral wall A. May be provided.

A second aspect of the present invention for solving the same problem.
The invention described in (1) is a packaging box provided with a reference surface which is bent from the developed shape and serves as a bottom surface or a top surface and a plurality of peripheral walls surrounding the reference surface, wherein one peripheral wall A is folded up from the reference surface by a predetermined amount. The peripheral wall A is vertically folded along a line, and the distal end side of the peripheral wall A is bent substantially at 180 ° along a folding line parallel to the folding line to form a folded portion overlapping the peripheral wall A. At least one peripheral wall B adjacent to A is vertically erected along a predetermined fold line from the reference plane, and a side portion of the peripheral wall B is along a fold line perpendicular to the fold line. In the packaging box which is bent and inserted between the peripheral wall A and the folded portion to form a sandwiching portion, a convex portion is provided at a tip of the folded portion, and the convex portion is located on a reference plane. Being pressed Which is a packaging box which is characterized.

An object of the present invention is to omit the projection 23 and the slit 20 of the conventional packaging box. That is, in the packaging box 100 of the related art, as described above, the protrusion 23 provided at the tip of the folded portion is inserted into the slit 20 provided at the center of the folding lines 12 and 14, and the folded portion is turned up. Is preventing that. However, in this configuration, it is essential to provide the slits 20 in the folding lines 12 and 14. Here, the portions of the folding lines 12 and 14 are one of the most rigid portions in the packaging box. For this reason, in the packaging box of the related art, stress concentrates on the portion of the slit 20 and often breaks with the slit 20 as a starting point. The packaging box is generally transported in an unfolded state and assembled in a predetermined shape at the site of use. However, in many cases, the packaging box is piled up (in a state where the projections 23 are located on the top and bottom) during transportation and storage. In the conventional packaging box, if the stacking is performed in the unfolded state, the projections are weighted and the projections are deformed. Therefore, when assembled in a box state, the protrusion 2
3 may not be sufficiently engaged with the slit 20, and the rigidity may be extremely low. On the other hand, in the packaging box of the present invention, a convex portion is provided at the tip of the folded portion,
A configuration in which the projection is pressed against the reference surface is employed. In the packaging box of the present invention, a convex portion is provided at the tip of the folded portion,
The protrusion is pressed against the reference plane. Therefore, in the packaging box of the present invention, a strong frictional force is generated between the convex portion and the reference surface, thereby preventing the folded portion from spreading. In the packaging box of the present invention, since there is no need to provide a slit, there is no adverse effect such as breakage from the conventional slit portion. In addition, since the projection can have a larger area than the projection of the related art, deformation during transportation or storage is small. The number of protrusions is arbitrary, and may be one or many.

A third aspect of the present invention is to achieve the same object.
The invention described in (1) is a packaging box provided with a reference surface which is bent from the developed shape and serves as a bottom surface or a top surface and a plurality of peripheral walls surrounding the reference surface, wherein one peripheral wall A is folded up from the reference surface by a predetermined amount. The peripheral wall A is vertically folded along a line, and the distal end side of the peripheral wall A is bent substantially at 180 ° along a folding line parallel to the folding line to form a folded portion overlapping the peripheral wall A. At least one peripheral wall B adjacent to A is vertically erected along a predetermined fold line from the reference plane, and a side portion of the peripheral wall B is along a fold line perpendicular to the fold line. In a packaging box that is bent and inserted between the peripheral wall A and the folded portion to form a sandwiching portion, the tip of the folded portion is further bent in parallel with the folding line, and A packing box, wherein the lower portion is in contact with the reference surface.

Another object of the present invention is to omit the projections 23 and the slits 20 of the conventional packaging box, as in the above-described invention. In the packaging box of the present invention, the tip of the folded portion is further bent parallel to the fold line, and the bent portion is in contact with the reference plane. Therefore, the leading end side of the folded portion comes into contact with the reference surface with a considerable contact area, and resists the force in the opening direction of the folded portion.
One of the objects of the present invention is to omit the projection 23 and the slit 20 as described above.
This does not deny the combined use of 3 and the configuration having the slit 20.

According to a fourth aspect of the present invention, there is provided a packaging box provided with a reference surface serving as a bottom surface or a top surface and a plurality of peripheral walls surrounding the reference surface. In addition, one peripheral wall A is vertically folded along a predetermined fold line from the reference plane, and the distal end side of the peripheral wall A is further bent at approximately 180 ° along a fold line parallel to the fold line. And at least one peripheral wall B adjacent to the peripheral wall A is vertically folded along a predetermined folding line from a reference plane, and further a side surface of the peripheral wall A is formed. Part is bent along a fold line positioned perpendicular to the fold line, and is inserted between the peripheral wall A and the fold part to form a sandwiching part. The wide portion is provided, a packing box, characterized in that the wide portion has contact with the wall portion that overlaps the peripheral wall B or wall B.

As with the above-mentioned invention, the packaging box of the present invention also has the projections 23 and slits 20 of the conventional packaging box.
Is to omit one of the tasks. In the packaging box of the present invention, a wide portion is provided on a side surface of the folded portion,
The wide portion is in contact with the peripheral wall B or a wall portion overlapping the peripheral wall B. Therefore, the folded portion is pressed against the peripheral wall B, and can resist the force in the opening direction of the folded portion. It should be noted that the present invention does not deny the combined use of the configuration having the projections 23 and the slits 20.

A fifth aspect of the present invention for solving the same problem.
The invention described in (1) is a packaging box provided with a reference surface which is bent from the developed shape and serves as a bottom surface or a top surface and a plurality of peripheral walls surrounding the reference surface, wherein one peripheral wall A is folded up from the reference surface by a predetermined amount. The peripheral wall A is vertically folded along a line, and the distal end side of the peripheral wall A is bent substantially at 180 ° along a folding line parallel to the folding line to form a folded portion overlapping the peripheral wall A. At least one peripheral wall B adjacent to A is vertically erected along a predetermined fold line from the reference plane, and a side portion of the peripheral wall B is along a fold line perpendicular to the fold line. In a packaging box which is bent and inserted between the peripheral wall A and the folded portion to form a sandwiching portion, a side portion of the folded portion is formed along a folding line positioned perpendicular to the folding line. Folding Gerare a packaging box which is characterized by being superposed on the peripheral wall B.

According to the present invention, the vertical ridge line 6 (see FIG.
3). In the packaging box of the present invention, the side surface of the folded portion is folded along a folding line located perpendicular to the folding line and overlaps with the peripheral wall B. Therefore, the vertical line of the packaging box is
It is reinforced by the side surface of the folded portion.

A sixth aspect of the present invention for solving the same problem.
The invention described in (1) is a packaging box provided with a reference surface which is bent from the developed shape and serves as a bottom surface or a top surface and a plurality of peripheral walls surrounding the reference surface, wherein one peripheral wall A is folded up from the reference surface by a predetermined amount. The peripheral wall A is vertically folded along a line, and the distal end side of the peripheral wall A is bent substantially at 180 ° along a folding line parallel to the folding line to form a folded portion overlapping the peripheral wall A. At least one peripheral wall B adjacent to A is vertically erected along a predetermined fold line from the reference plane, and a side portion of the peripheral wall B is along a fold line perpendicular to the fold line. In the packaging box which is bent and inserted between the peripheral wall A and the folded portion to form a sandwiching portion, a convex portion is provided at a tip of the folded portion, and the convex portion is located on a reference plane. Is pressed, The side surface of the overlapping portion is bent along a folding line positioned perpendicular to the folding line, is overlapped with the peripheral wall B, and further has a slit between the peripheral wall A and the folded portion, A projection is provided at a position corresponding to the slit of the portion, and the projection is inserted into the slit.

In the packaging box of the present invention, a projection is provided at the tip of the folded portion, and the projection is pressed against the reference plane. Therefore, in the packaging box of the present invention, the convex portion at the tip of the folded portion is pressed against the reference surface, and a strong frictional force is generated between the two to prevent the folded portion from spreading. Further, in the packaging box of the present invention, since the side portion of the folded portion is bent along the folding line positioned perpendicular to the folding line and overlaps with the peripheral wall B, the vertical ridge line of the packaging box is It is reinforced by the side surface of the folded portion. Furthermore, the packaging box of the present invention has a configuration in which a slit is provided between the peripheral wall A and the folded portion, and a projection is provided at a position corresponding to the slit of the sandwiching portion, and the projection is inserted into the slit. Can withstand the force in the opening direction.

[0022]

Embodiments of the present invention will be described below. In the following embodiments, the same components as those of the related art are denoted by the same reference numerals.

(Embodiment 1) FIG. 1 is an exploded view of a packaging box according to a first embodiment of the present invention. FIG. 2 is an enlarged view of a main part of FIG. FIG. 3 is a perspective view showing a procedure for assembling the packaging box of FIG. FIG. 4 is a sectional perspective view of the packaging box according to the first embodiment of the present invention as viewed from the inside. FIG. 5 is an exploded perspective view showing an example of packaging using the packaging box of FIG. 1 and a cross-sectional view taken along line AA of the packing material. FIG. 6 is an enlarged view of a main part of a development view of a packaging box showing a modification of the first embodiment of the present invention. FIG. 7 is an expanded view of a packaging box showing another modification of the first embodiment of the present invention. FIG. 8 is a perspective view showing a procedure for assembling the packaging box of FIG.

In the packaging box 30 of this embodiment, a slit 31 is provided between the peripheral walls (peripheral walls A) 2, 4 on the short side and the folded portion, and the slits 3a, 3b, 5a, 5b correspond to the slits. FIG. 1 shows an example of a configuration in which a claw-shaped projection 32 is provided and the projection 32 is inserted into the slit 31. That is, the packaging box 30 of the present embodiment is obtained by adding the projections 32 and the slits 31 to the packaging box 100 described in the section of the related art, and the basic configuration is exactly the same as the packaging box 100 of the related art. . Briefly, the packaging box 3 of the present embodiment will be described.
0 is the same as the prior art shown in FIG. 32, and is a rectangular parallelepiped box having no top surface (or bottom plate) and having a reference surface 1 serving as a bottom plate (or top surface). 4 on the circumference
Two peripheral walls 2, 3, 4, 5 are provided.

As shown in FIG. 1, the unfolded shape of the packaging box 30 according to the present embodiment is centered on the reference plane 1 and is surrounded by the peripheral walls 2 and 2.
The rectangles 3, 4, and 5 are arranged. A fold line 1 is provided between the reference plane 1 and the peripheral walls 2, 3, 4, and 5.
2, 13, 14, and 15 are attached. Further, a slit 20 is provided in the center between the reference surface 1 and the peripheral walls 2 and 4 on the short side. The slit 20 is a long hole formed by punching.

Further, folded portions 2a and 4a are provided at the leading ends of the peripheral walls 2 and 4 on the short side via folding lines 21 parallel to the folding lines 12 and 14, respectively. A claw-shaped projection 23 is provided at the center of the tip of each of the folded portions 2a and 4a.

On the other hand, on both sides of the long side peripheral walls (peripheral walls B) 3, 5, substantially square sandwiching portions 3 a, 3 b, 5 a, 5b
Is provided.

As a specific configuration of the packaging box 30 of this embodiment, a slit 31 is provided at the center of the boundary between the peripheral walls 2 and 4 on the short side and the folded portions 2a and 4a in the developed shape. More specifically, a slit 31 is provided at the center of the bending line 21. The slit 31 is
In the present embodiment, the shape is a long hole formed by punching. Another claw-shaped projection 32 is provided at the outer end of the sandwiching portions 3a, 3b, 5a, 5b. The projections 32 are located at positions corresponding to the slits 31 when the projections 32 are assembled from a developed shape into a box shape.

As another unique configuration, in the packaging box 30 of the present embodiment, the cut-out portions 33 are provided in the folded portions 2a and 4a. The position of the cut-shaped portion 33 is the center of the folded portions 2a, 4a in the longitudinal direction, and is a portion near the end in the short direction. The shape of the cut portion 33 is shown in FIG.
As shown in (b), it has a substantially semicircular shape. The semi-circular portion 33a is a cut where a material such as a cardboard penetrates and is completely cut. The convex side (arc side) of the semicircular portion 33a is in the opposite direction to the projection 23 provided on the folded portions 2a and 4a. An arc-shaped notch 33b is provided at the center of the semicircular portion 33a as shown in FIG.

When assembling the packaging box 30, as shown in FIG.
Then, the folded portions 2a and 4a are bent 180 degrees from the folding line 21. On the other hand, the sandwiching portions 3a, 3b, 5a, 5b are bent 90 degrees inward from the bending line 25. And the sandwiching parts 3a, 3b, 5a, 5b are the peripheral walls 2, 4 on the short side.
And both are folded in a state of being inserted between the folded portions 2a and 4a. Here, as a configuration unique to the present embodiment, the projections 32 provided on the sandwiching portions 3a, 3b, 5a, 5b are inserted into the slits 31 provided on the boundary between the peripheral walls 2, 4 and the folded portions 2a, 4a. Is done.

FIG. 4 (b) or FIG. 4 (c) shows the relationship between the insertion of the projection 32 into the slit 31 and the size of both. In the relationship shown in FIG. 4B, the length of the slit 31 is about twice the length of the projection 32, and the projections 32 are inserted into the slit 31 in a line in the longitudinal direction. On the other hand, FIG.
In the relationship (c), the width of the slit 31 is about twice the thickness of the projection 32, and the projection 32
1 is inserted. Note that the relationship between the protrusion 32 and the slit 31 is the same in other embodiments described later.
The format shown in FIG. 4B and the format shown in FIG. 4C can be selected.

Then, as in the prior art, the folded portions 2a,
The protrusion 23 provided at the tip of 4a is inserted into the slit 20, and the packaging box 30 is completed (FIG. 4).

In the packaging box 30 of the present embodiment, the projections 32 provided on the sandwiching portions 3a, 3b, 5a, 5b belonging to the peripheral walls 3, 5 on the long side are folded into the folds belonging to the peripheral walls 2, 4 on the short side. Slit 3 provided at the boundary between overlapping portions 2a and 4a
1 is inserted. Therefore, when the long side peripheral walls 3 and 5 are to open in the direction of arrow A in FIG. 4, the projection 32 engages with the slit 31 and opposes the opening force of arrow A. Therefore, in the packaging box 30 of the present embodiment, the peripheral walls 3 and 5 on the long side are difficult to open and are strong.

Although the method of using the packaging box 30 of the present embodiment is arbitrary, it can be used, for example, for see-through packaging as shown in FIG. In the see-through packaging, a packaging box 30 is attached above and below a product 35 as shown in FIG. In addition, a packing material 36 such as styrene foam is disposed between the product and the packaging box 30. Packing material 3
6 is formed in advance, for example, two upper and lower parts are provided as shown in FIG. 5, and the outer shape matches the inside of the packaging box 30. It has a shape to hold. That is, a holding portion 38 for holding a part of the product is provided inside the packing material 36. In addition, the packing material 36 generally has a large dimensional error at the time of molding, so that it is difficult for the product to enter the holding portion, and conversely, a gap is often formed. As a countermeasure, it is desirable to provide a reinforcing rib 37 inside the holding portion. The reinforcing rib 37 is a ridge provided along the direction in which the product is inserted, and is pressed against the wall surface of the product 35 when the product is inserted. The relationship between the size "a" of the product 35, the size "b" of the holding portion 38, and the size "c" of the reinforcing rib 37 is as follows.
"(B-2c) <a <b".

Further, the packaging box 30 of the present embodiment has a unique effect that no trouble is required when discarding the box. That is, generally, the packaging box is crushed after the transportation of the product is completed, and is used as a raw material for incineration or recycled paper. Therefore, the used packaging boxes are returned to the original unfolded shape and transported to an incineration plant or a reprocessing plant. However, "0422" described in the prior art
Since the type of packaging box has a claw-shaped projection 23 and the projection 23 is inserted into the slit 20, it cannot be returned to the developed shape unless the projection 23 is pulled out from the slit 20. Here, when the conventional packaging box 100 is in the box state, there is no gripping portion in the folded portion 4a, and the projection 23
It was difficult to pull out of the slit 20. For this reason, there is a problem that it is troublesome to crush the packaging box of the “0422” format. On the other hand, in the packaging box 30 of the present embodiment, since the cut-shaped portion 33 is provided at a position near the end in the short direction at the center in the longitudinal direction of the folded portions 2a and 4a, the cut-shaped portion 33 is provided. Is caused as shown in FIG. 4, and the semicircular portion 33a is pinched and pulled, whereby the folded portion 4a
Is turned up in the direction of arrow B, and the projection 23 comes out of the slit 20. Therefore, the packaging box 30 of the present embodiment has a unique effect that it can be easily crushed.

In the above embodiment, the slit 31 is
An example of a long hole shape formed by punching is shown.
However, in the present invention, the slit 31 is not limited to a punched hole, but may be one provided with a cut as shown in FIG. That is, in the packaging box 30 'shown in FIG. 6, the slit 31' is formed by a substantially "U" -shaped cut, and the base 31'a of the cut is connected. The packaging box 30 'of the present embodiment forms a slit by making a cut at the time of assembly. Moreover, in the packaging box 30 'of this embodiment, the slit 20' also has a cut structure, and the root portion 20'a is connected.

The packaging box 30 ′ of the present embodiment has a slit 2
Since the cutouts 0 'and 31' are not scattered as in the case of a punched hole, the surroundings are not stained, or there is no need to remove the punched pieces during the work, thereby increasing the work efficiency. There is a unique effect. The invention in which the slits 20 ′ and 31 ′ have a cut structure can be used in common for all packaging box embodiments described later.

In the above-described embodiment, the holding portion 3
Although a, 3b, 5a, and 5b are all substantially square, the present invention is, of course, not limited to a substantially square shape of the sandwiching portion. For example, the packaging box 3 shown in FIG.
0 ″, rectangular sandwiching portions 3′a, 3′b,
It is also possible to adopt 5'a and 5'b. In the packaging box 30 ″ shown in FIG. 7, the sandwiching portions 3′a, 3′b,
5'a and 5'b have the same area as the peripheral walls 2 and 4 on the short side. When the sandwiching portions 3'a, 3'b, 5'a, and 5'b have the same area as the short side peripheral walls 2 and 4 as in the case of the packaging box 30 '', the sandwiching is performed as shown in FIG. The portions 3'a and 5'a and the sandwiching portions, 3'b and 5'b overlap and overlap between the peripheral walls 2, 4 and the folded portions 2a, 4a.

(Embodiment 2) Next, a second embodiment of the present invention will be described. The following embodiment (Embodiment 3)
In the following description, the same components as those of the prior art or the above-described first embodiment will be denoted by the same reference numerals, and redundant description will be omitted. FIG. 9 is a development view of the packaging box according to the second embodiment of the present invention. FIG.
FIG. 7 is a perspective view showing a procedure for assembling the packaging box of FIG. FIG.
It is the sectional perspective view which looked at the packaging box of the second embodiment of the present invention from the inside. FIG. 12 is a cross-sectional view taken along a plane A in FIG. FIG. 13 is a developed view of a packaging box according to a modification of the second embodiment of the present invention.

The packaging box 40 of the present embodiment is
a, 4a, a convex portion 41 is provided at the tip, and the convex portion 41 is
2 shows an example of a configuration for pressing against a reference surface 1. That is, in the packaging box 100 of the related art, the protrusion 23 provided at the tip of the folded portions 2a and 4a is inserted into the slit 20,
Although the folding portions 2a and 4a are prevented from being turned up, the packaging box 40 of the present embodiment is provided with a convex portion 41 at the tip of the folding portions 2a and 4a instead. The folded portions 2a and 4a are fixed by pressing the portion 41 against the reference surface 1.

More specifically, the packaging box 4 of the present embodiment will be described.
0, the leading ends of the folded portions 2a and 4a correspond to FIGS.
And a convex portion 41 is formed. In the packaging box 40 of the present embodiment, the folded line 1
There are no slits or the like in the portions 2 and 14.

The packaging box 40 is the same as that of the previous embodiment shown in FIG.
As shown at 0, the peripheral walls 2, 3, 4, and 5 are vertically folded from the respective fold lines 12, 13, 14, and 15, and the folded portions 2a and 4a are further bent at 180 ° from the fold line 21. On the other hand, the sandwiching portions 3a, 3b, 5a, 5b
Is bent 90 ° inward from the folding line 25.
And the sandwiching parts 3a, 3b, 5a, 5b are
And both are folded in a state of being inserted between the folded portions 2a and 4a. Further, in the packaging box 40 of the present embodiment, the convex portions 41 provided at the tips of the folded portions 2a and 4a are provided.
Is pressed against the reference surface 1 serving as a bottom surface (or a top surface). As a result, the reference surface 1 is deformed, and
(Fig. 12). Therefore, the folded portions 2a, 4a
Is fixed to the reference plane 1 and does not turn over.

Since there is no need to provide a slit between the reference surface 1 and the peripheral walls 2 and 4 in the packaging box 40 of the present embodiment, the box is not broken by the slits and the box is strong.
In addition, there is a unique effect that the punched pieces are not scattered as in the case of the punched holes, the surroundings are not stained, or the punched pieces are not removed during the work, and the work efficiency is increased.

In the above-described embodiment, the convex portion 41 has a tapered tip as an example. However, the convex portion may have another shape. Packaging box 4 shown in FIG.
0 'indicates an example in which a jagged convex portion 41' such as a saw tooth is employed.

(Embodiment 3) Next, a third embodiment of the present invention will be described. FIG. 14 is a development view of the packaging box according to the third embodiment of the present invention. FIG. 15 is a perspective view showing a procedure for assembling the packaging box of FIG. FIG. 16 is a sectional perspective view of the packaging box according to the third embodiment of the present invention as viewed from the inside. FIG. 17 is a development view of a packaging box according to a modification of the third embodiment of the present invention. FIG. 18 is a perspective view of a main part showing the shape of the tip of the folded portion when the packaging box shown in FIG. 17 is assembled. FIG. 19 is a sectional view when the packaging box shown in FIG. 17 is assembled.

The packaging box 50 of the present embodiment is
This shows an example of a configuration in which the tips of a and 4a are bent in parallel with a fold line, and the bent portions 51 are brought into contact with the reference surface 1 to fix the folded portions 2a and 4a.

That is, in the packaging box 100 of the prior art, the projections 23 provided at the tips of the folded portions 2a and 4a are inserted into the slits 20 to prevent the folded portions 2a and 4a from being turned up. However, the packaging box 5 of the present embodiment
Reference numeral 0 designates a structure in which a bent portion 51 is provided at the tip of each of the folded portions 2a and 4a, and the bent portions 51 are brought into contact with the reference surface 1 to fix the folded portions 2a and 4a.

The expanded shape of the packaging box 50 of this embodiment is such that, as shown in FIG. 14, a bent portion 51 is further provided at the longitudinal end of the folded portions 2a and 4a. The bending portion 51 includes a bending line 5 parallel to the bending line 21.
Folded from 2. In the packaging box 50 of the present embodiment,
There are no slits or the like at the fold lines 12 and 14.

The procedure for assembling the packaging box 50 is the same as that of the previous embodiment. As shown in FIG. 15, the peripheral walls 2, 3, 4, and 5 are vertically separated from the fold lines 12, 13, 14, and 15 respectively. Fold it up and further fold the folded portions 2a and 4a
And bend 180 °. Further, in the present embodiment, the bent portion 51 is further bent at about 90 ° from the bending line 52 parallel to the fold line 21. On the other hand, the sandwiching portion 3
a, 3b, 5a, and 5b are 9
It is bent at 0 °. And the sandwiching parts 3a, 3b, 5
In the state where a and 5b are inserted between the peripheral walls 2 and 4 and the folded rectangles 2a and 4a, both are folded. In the packaging box 50 of the present embodiment, the bent portion 51 provided at the tip of the folded portions 2a and 4a is parallel to the reference surface 1 and is in contact with the reference surface 1. Desirably, the bent portion 51 is pressed against the reference surface 1. Here, the bent portion 51 has a considerable area, and as shown in FIG. 16, the bent portion 51 contacts the reference surface 1 with a considerable contact area. Therefore, the folded portions 2a and 4a are fixed to the reference surface 1 and do not turn up.

The packaging box 50 of the present embodiment does not need to provide a slit between the reference surface 1 and the peripheral walls 2 and 4, so that the box is not broken due to the slit and is robust.
In addition, there is a unique effect that the punched pieces are not scattered as in the case of the punched holes, the surroundings are not stained, or the punched pieces are not removed during the work, and the work efficiency is increased.

The packaging box 50 ′ shown in FIG. 17 is a further development of the above-described second embodiment, in which a cut 53 is provided in a part of the bending line 52 so that a claw-shaped projection 55 is formed.
Is provided. That is, in the packaging box 50 ', FIG.
Similarly to the packaging box 50 shown in FIG. 4, the leading ends of the folded portions 2a and 4a are bent from the folding line 52. In the packaging box 50 'of this embodiment, a cut 53 is formed at the end of the folding line 52. Is provided. The shape of the cut 53 is an “L” shape as shown in FIGS.
Extends parallel to the fold line 52 from the end of
It is bent and is in contact with the bending line 52.

The above-described cut 53 is formed by bending portion 5
When the reference numeral 1 is bent so as to be parallel to the reference plane 1, it keeps a straight state without bending as shown in FIG. Therefore, the portion becomes a claw-shaped convex portion 55 and presses the surface of the reference surface 1 as shown in FIG. As a result, the reference surface 1 is deformed, and a part of the protrusion 55 bites into the reference surface 1. Therefore, the folded portions 2a and 4a are fixed to the reference surface 1 and do not turn up. The position of the cut 53 is arbitrary, and the packaging box 5 shown in FIG.
It may be provided at the center such as 0 ″.

(Embodiment 4) Next, a fourth embodiment of the present invention will be described. FIG. 20 is a development view of the packaging box according to the fourth embodiment of the present invention. FIG. 21 is a perspective view showing the procedure for assembling the packaging box of FIG. FIG. 22 is a sectional perspective view of the packaging box according to the fourth embodiment of the present invention as viewed from the inside.

The packaging box 60 of the present embodiment is
This shows an example of a configuration in which a and 4a are widened in the width direction and the adjacent peripheral walls 3 and 5 are pressed to fix the folded portions 2a and 4a.

That is, the packaging box 60 of the present embodiment is the same as that of FIG.
The folded portions 2a and 4a have a tapered shape expanding outward as shown in FIG. 2A, and wide portions 61 are provided at both ends. The packaging box 60 is assembled as shown in FIG. 21 similarly to the previous embodiment, but the folded parts 2a, 4a
Are provided at both ends thereof, so that the wide portions 61 press the lower portions of the adjacent peripheral walls 3 and 5 in the assembled state. As a result, as shown in FIG. 22, the peripheral walls 3 and 5 are deformed, and a part of the wide portion 61 bites into the peripheral walls 3 and 5. Therefore, the folded portions 2a and 4a are fixed to the peripheral walls 3 and 5 and do not turn up. In the packaging box 60 of the present embodiment, the tapered shape expanding outward is illustrated as an example of the wide portion 61. Such a tapered shape that spreads outwardly, when assembled in a box shape, causes a portion closer to the reference surface 1 to protrude further, and is farthest from the folding line 21, and the most effective reaction force against turning up Is recommended because it can generate However, the present invention can also employ a jagged wide portion 61 'as shown in FIG.

In the packaging boxes 60 and 60 ′ of the present embodiment, the configuration in which the wide portions 61 and 61 ′ are directly pressed against the peripheral walls 3 and 5 is exemplified. , 5 are folded to form a double structure, a separate piece of corrugated cardboard is attached to the peripheral walls 3, 5, or the folded portions 2a, 4a and the base 1 are folded back in a complicated manner.
In the case where there is a wall portion that overlaps the peripheral walls 3 and 5 as in the case of following, the wide portion 61 may be pressed against the wall portion. In short, if the wide portions 61 and 61 'are configured to be pressed against a part of the adjacent wall, the operation and effect of the present invention can be achieved.

(Embodiment 5) Next, a fifth embodiment of the present invention will be described. FIG. 23 is a development view of the packaging box according to the fifth embodiment of the present invention. FIG. 24 is a perspective view showing a procedure for assembling the packaging box of FIG. FIG. 25 is a sectional perspective view of the packaging box according to the fifth embodiment of the present invention as viewed from the inside. FIG. 26 is a development view of a packaging box according to a modification of the fifth embodiment of the present invention. FIG. 27 is a perspective view showing a procedure for assembling the packaging box of FIG. FIG. 28 is a sectional perspective view of the packaging box according to the fifth embodiment of the present invention as viewed from the inside.

The packaging box 70 of this embodiment, shown in FIGS. 23 to 25, is formed by folding the side portions of the folded portions 2a and 4a along a folding line 71 positioned perpendicular to the folding lines 12 and 14. 32 shows an example in which the vertical ridge line 70 (see FIG. 32) is reinforced.

As shown in FIG. 23, the packaging box 70 of this embodiment is provided with bent portions 72 at both ends of the folded portions 2a and 4a. The bent portion 72 is formed by folding lines 12 and 14.
Is vertically bent inward from a bending line 71 located vertically. That is, in the packaging box 70 of the present invention, FIG.
As shown in FIG. 25, both side surfaces of the short side folded portions 2a and 4a are bent along a bending line 71 positioned perpendicular to the fold lines 12 and 14, and the bent portion 72 is adjacent to the peripheral wall 3 as shown in FIG. , 5 are superimposed. Therefore, the vertical ridge line of the packaging box 70 is reinforced by the bent portion 72.
In the packaging box 70 of the present embodiment, the projections 23 are inserted into the slits 20 and the folded portions 2a, 4a
The method of fixing is also used.

The packaging box 70 ′ of this embodiment shown in FIGS. 26 to 28 is obtained by developing the above-described packaging box 70, and further includes an auxiliary folding section 75 outside the folding section 72 in the longitudinal direction. The auxiliary bending portion 75 is connected to the reference surface 1
Is contacted. That is, the auxiliary folding portion 75 employed in the packaging box 70 'of the present embodiment is
It is bent from a bending line 76 parallel to 2,14.
In the packaging box 70 'of this embodiment, the bent portion 72 has a substantially square shape. In the packaging box 70 'of the present embodiment,
As shown in FIG. 28, the bent portion 72 is overlapped with the peripheral walls 3 and 5, not only to reinforce the ridge line portion 6, but also the auxiliary bent portion 75 is in contact with the reference surface 1 with a considerable area, and the folded portion 2
Turning over of a and 4a is prevented.

In the packaging boxes 70 and 70 'of the present embodiment, the bent portions 72 and 72' are directly overlapped with the peripheral walls 3 and 5, however, as in the case of the fourth embodiment described above. In the case where there is a wall portion overlapping the peripheral walls 3 and 5, the bent portions 72 and 72 'may be overlapped on the wall portion.

(Embodiment 6) Next, a sixth embodiment of the present invention will be described. FIG. 29 is a development view of a main part of a packaging box according to the sixth embodiment of the present invention. FIG. 30 is a perspective view showing a procedure for assembling the packaging box of FIG. FIG. 31 is a sectional perspective view of the packaging box according to the sixth embodiment of the present invention as viewed from the inside.

The packaging box 80 of this embodiment has the features of the first embodiment, the second embodiment, and the fifth embodiment. That is, in the packaging box 80 of the present embodiment, the slit 31 is provided at the center of the bending line 21, and the claw-shaped protrusions 32 provided at the sandwiching portions 3 a, 3 b, 5 a, 5 b are inserted into the slit 31.
Further, in the packaging box 80 of the present embodiment, the folded portions 2a, 4
A tapered convex portion 41 is provided at the tip of “a”, and the convex portion 41 is pressed against the reference surface 1. Further, in the packaging box 80 of the present embodiment, the bent portion 72 is
5 and the ridge line portion 6 is reinforced, the auxiliary folding portion 75 contacts the reference surface 1 with a considerable area, and the folding portion 2
Turning over of a and 4a is prevented.

Note that the packaging box 80 of this embodiment also has the peripheral walls 3 and 5 similarly to the case of the fifth embodiment.
When a wall portion overlaps the bent portion 7
It is good also as composition which overlaps 2 and 72 '.

The sixth embodiment described above has the features of the first, second, and fifth embodiments as described above. Any or a combination of two or more of the fifth to fifth embodiments, a combination of the second embodiment and the fourth embodiment, and a combination of the third embodiment and the fifth embodiment are also possible.

[0066]

According to the first aspect of the present invention, the packaging box has a slit between the peripheral wall A and the folded portion, and a projection is provided at a sandwiching portion integrated with the peripheral wall B, and the projection is provided with a slit. The peripheral wall A and the peripheral wall B are engaged with each other by the projections and the slits in a box-shaped state, so that the peripheral wall A and the peripheral wall can resist the force in the opening direction of the peripheral wall. Therefore, the packaging box of the present invention has the effect that the strength of the sandwiching portion is high and the peripheral wall is prevented from opening.

In the packaging box according to the second aspect, a projection is provided at the tip of the folded portion, and the projection is pressed against the reference surface. Therefore, in the packaging box of the present invention, the convex portion at the tip of the folded portion is pressed against the reference surface, and a strong frictional force is generated between the two to prevent the folded portion from spreading. Further, in the packaging box of the present invention, since the folded portion is fixed without using the slit, there is no adverse effect such as breaking from the slit portion as in the conventional case.

Further, in the packaging box according to the third aspect, the tip of the folded portion is further bent parallel to the folding line, and the bent portion comes into contact with the reference surface, and resists the force in the opening direction of the folded portion. The configuration is adopted. In the packaging box of the present invention, since the folded portion can be fixed without using the slit, it is possible to prevent the harmful effect that the packaging box is broken from the conventional slit portion.

Further, in the packaging box according to the fourth aspect, a wide portion is provided on the side surface of the folded portion, and the folded portion is pressed against the peripheral wall B, so as to resist the force in the opening direction of the folded portion. I have. In the packaging box of the present invention, since the folded portion can be fixed without using the slit, it is possible to prevent the harmful effect that the packaging box is broken from the conventional slit portion.

In the packaging box according to the fifth aspect, the side surface of the folded portion is bent along a folding line positioned perpendicular to the folding line and overlaps with the peripheral wall B. The vertical ridgeline is reinforced and has high rigidity.

Further, in the packaging box according to the sixth aspect, a convex portion is provided at the tip of the folded portion, and since the convex portion is pressed against the reference surface, the folded portion is prevented from spreading. Since the side portion of the folded portion is overlapped with the peripheral wall B,
The vertical ridge line of the packaging box is reinforced by the side surface of the folded portion, and further has a slit between the peripheral wall A and the folded portion, and the projection of the sandwiching portion is inserted into the slit. A can withstand the force in the opening direction of A. Therefore, the packaging box of the present invention has an excellent effect that the rigidity is high overall.

[Brief description of the drawings]

FIG. 1 is a development view of a packaging box according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a perspective view showing a procedure for assembling the packaging box of FIG. 2;

FIG. 4 is a sectional perspective view of the packaging box according to the first embodiment of the present invention as viewed from the inside.

FIG. 5 is an exploded perspective view showing an example of packaging using the packaging box of FIG. 1 and a cross-sectional view of the packing material taken along line AA.

FIG. 6 is an enlarged view of a main part of a development view of a packaging box showing a modification of the first embodiment of the present invention.

FIG. 7 is a development view of a packaging box showing another modification of the first embodiment of the present invention.

FIG. 8 is a perspective view showing a procedure for assembling the packaging box of FIG. 7;

FIG. 9 is a development view of a packaging box according to the second embodiment of the present invention.

FIG. 10 is a perspective view showing a procedure for assembling the packaging box of FIG. 9;

FIG. 11 is a cross-sectional perspective view of a packaging box according to a second embodiment of the present invention as viewed from the inside.

FIG. 12 is a cross-sectional view taken along a plane A in FIG. 11;

FIG. 13 is a development view of a packaging box according to a modification of the second embodiment of the present invention.

FIG. 14 is a development view of a packaging box according to a third embodiment of the present invention.

FIG. 15 is a perspective view showing a procedure for assembling the packaging box of FIG. 14;

FIG. 16 is a sectional perspective view of a packaging box according to a third embodiment of the present invention as viewed from the inside.

FIG. 17 is a development view of a packaging box according to a modification of the third embodiment of the present invention.

18 is a perspective view of relevant parts showing the shape of the tip of the folded portion when the packaging box shown in FIG. 17 is assembled.

19 is a cross-sectional view when the packaging box shown in FIG. 17 is assembled.

FIG. 20 is an expanded view of a packaging box according to a fourth embodiment of the present invention.

FIG. 21 is a perspective view showing a procedure for assembling the packaging box of FIG. 20;

FIG. 22 is a sectional perspective view of a packaging box according to a fourth embodiment of the present invention as viewed from the inside.

FIG. 23 is a development view of a packaging box according to a fifth embodiment of the present invention.

FIG. 24 is a perspective view showing a procedure for assembling the packaging box of FIG. 23;

FIG. 25 is a sectional perspective view of a packaging box according to a fifth embodiment of the present invention as viewed from the inside.

FIG. 26 is a development view of a packaging box according to a modification of the fifth embodiment of the present invention.

FIG. 27 is a perspective view showing a procedure for assembling the packaging box of FIG. 26;

FIG. 28 is a sectional perspective view of a packaging box according to a fifth embodiment of the present invention as viewed from the inside.

FIG. 29 is a development view of a main part of a packaging box according to a sixth embodiment of the present invention.

FIG. 30 is a perspective view showing a procedure for assembling the packaging box of FIG. 29;

FIG. 31 is a sectional perspective view of a packaging box according to a sixth embodiment of the present invention as viewed from the inside.

FIG. 32 is a perspective view of a packaging box.

FIG. 33 is an exploded view of a conventional packaging box.

FIG. 34 is a perspective view showing a procedure for assembling a packaging box according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reference surface 2, 4 Peripheral wall on short side (peripheral wall A) 3, 5 Peripheral wall on long side (peripheral wall B) 2a, 4a Folded part 3a, 3b, 5a, 5b Interposed part 3'a, 3'b, 5'a, 5'b Nipping portion 12, 13, 14, 15 Folding line 23 Projection 30, 30 ', 30' 'Packaging box 31 Slit 32 Projection 33 Cut-out portion 36 Packing material 37 Reinforcement rib 38 Holding portion 40, 40 'packaging box 41, 41' convex part 50, 50 ', 50' 'packaging box 51 bending part 52 bending line 53 break 60.60' packaging box 61, 61 'wide part 70, 70' packaging box 71 bending line 72 Folding part 75 Auxiliary bending part 80, 80 'Packaging box

Claims (6)

[Claims] 1. A packaging box provided with a reference surface which is bent from an expanded shape and becomes a bottom surface or a top surface and a plurality of peripheral walls surrounding the reference surface, wherein one peripheral wall A is a predetermined folding line from the reference surface. The peripheral wall A is bent vertically at approximately 180 ° along a folding line parallel to the folding line to form a folded portion overlapping the peripheral wall A. At least one peripheral wall B is vertically folded along a predetermined fold line from the reference plane, and the side surface of the peripheral wall B is folded along a fold line perpendicular to the fold line. The packaging box, which is inserted between the peripheral wall A and the folded portion to form a sandwiching portion, has a slit between the peripheral wall A and the folded portion, and a position corresponding to the slit of the sandwiching portion. To Projections are provided, packaging box in which the projection is characterized in that it is inserted into the slit. 2. A packaging box provided with a reference surface which is bent from an expanded shape and serves as a bottom surface or a top surface and a plurality of peripheral walls surrounding the reference surface, wherein one peripheral wall A is a predetermined folding line from the reference surface. The peripheral wall A is bent vertically at approximately 180 ° along a folding line parallel to the folding line to form a folded portion overlapping the peripheral wall A. At least one peripheral wall B is vertically folded along a predetermined fold line from the reference plane, and the side surface of the peripheral wall B is folded along a fold line perpendicular to the fold line. In the packaging box in which a sandwiching portion is formed by being inserted between the peripheral wall A and the folded portion, a convex portion is provided at a tip of the folded portion, and the convex portion is pressed against a reference surface. That is Packing box and butterfly. 3. A packaging box provided with a reference surface which is bent from the developed shape and becomes a bottom surface or a top surface and a plurality of peripheral walls surrounding the reference surface, wherein one peripheral wall A is a predetermined folding line from the reference surface. The peripheral wall A is bent vertically at approximately 180 ° along a folding line parallel to the folding line to form a folded portion overlapping the peripheral wall A. At least one peripheral wall B is vertically folded along a predetermined fold line from the reference plane, and the side surface of the peripheral wall B is folded along a fold line perpendicular to the fold line. In the packaging box in which the sandwiching portion is formed by being inserted between the peripheral wall A and the folding portion, the tip of the folding portion is further bent in parallel with the folding line, and the bending is performed. Packing box but which is characterized in that in contact with the reference surface. 4. A packaging box provided with a reference surface which is bent from an expanded shape and becomes a bottom surface or a top surface and a plurality of peripheral walls surrounding the reference surface, wherein one peripheral wall A is a predetermined folding line from the reference surface. The peripheral wall A is bent vertically at approximately 180 ° along a folding line parallel to the folding line to form a folded portion overlapping the peripheral wall A. At least one peripheral wall B is vertically folded along a predetermined fold line from the reference plane, and the side surface of the peripheral wall B is folded along a fold line perpendicular to the fold line. In the packaging box in which a sandwiching portion is formed by being inserted between the peripheral wall A and the folded portion, a wide portion is provided on a side surface of the folded portion, and the wide portion is the peripheral wall B or the peripheral wall B. Overlapping wall Packaging box, characterized in that it is in contact with. 5. A packaging box provided with a reference surface which is bent from an expanded shape and becomes a bottom surface or a top surface and a plurality of peripheral walls surrounding the reference surface, wherein one peripheral wall A is a predetermined folding line from the reference surface. The peripheral wall A is bent vertically at approximately 180 ° along a folding line parallel to the folding line to form a folded portion overlapping the peripheral wall A. At least one peripheral wall B is vertically folded along a predetermined fold line from the reference plane, and the side surface of the peripheral wall B is folded along a fold line perpendicular to the fold line. In the packaging box, which is inserted between the peripheral wall A and the folded portion to form a sandwiching portion, the side portion of the folded portion is bent along a folding line positioned perpendicular to the folding line. It is, packaging box, characterized by being superimposed with the wall portion overlapping the peripheral wall B or wall B. 6. A packaging box provided with a reference surface which is bent from an expanded shape and becomes a bottom surface or a top surface and a plurality of peripheral walls surrounding the reference surface, wherein one peripheral wall A is a predetermined folding line from the reference surface. The peripheral wall A is bent vertically at approximately 180 ° along a folding line parallel to the folding line to form a folded portion overlapping the peripheral wall A. At least one peripheral wall B is vertically folded along a predetermined fold line from the reference plane, and the side surface of the peripheral wall B is folded along a fold line perpendicular to the fold line. In the packaging box in which a sandwiching portion is formed by being inserted between the peripheral wall A and the folded portion, a convex portion is provided at a tip of the folded portion, and the convex portion is pressed against a reference surface. Has been folded The side portion of the ridge is bent along a fold line positioned perpendicular to the fold line, overlaps with the peripheral wall B or a wall overlapping the peripheral wall B, and further has a slit between the peripheral wall A and the folded portion. And a projection is provided at a position corresponding to the slit of the sandwiching portion, and the projection is inserted into the slit.