JP7439612B2 - packaging box - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Act On February 20, 2020, Gunma Mori Shigyo Co., Ltd. sold the packaging box according to the invention to the Fruit and Vegetable Station of the Saitama Prefecture Headquarters of the National Federation of Agricultural Cooperatives.

The present invention relates to packaging boxes.

BACKGROUND ART Conventionally, packaging boxes for storing things such as vegetables have been known to have an opening on the top surface. Among such packaging boxes, one that can maintain the shape of the top surface without using adhesive tape or staples has been proposed. An example of such a packaging box is one disclosed in Patent Document 1.

In the packaging box disclosed in Patent Document 1, a convex portion is formed at the tip of the folded piece provided at the tip of the top flap on the short side, and a fitting slit is formed at the base end of the top flap. has been done. Then, the folded piece is folded back so as to wrap around the holding piece of the top flap on the long side, and the convex portion at the tip is fitted into the fitting slit at the base end, thereby fixing the top flap.

Patent No. 4848570

Although the packaging box of Patent Document 1 can maintain a strong closed state, it is difficult to release the closed state, so there is a problem that it requires a lot of effort and time when unfolding the packaging box for disposal. there were.

SUMMARY OF THE INVENTION An object of the present invention is to provide a packaging box that solves the above-mentioned problems and can easily release the closed state while maintaining a strong closed state.

The present invention for solving the above problem is a packaging box including a cylindrical body and a flap connected to the body. In such a packaging box, the flap is fixed by fitting a tip protrusion provided at the tip of the flap into a fitting hole formed in the body around the base end position of the flap. The lid remains closed. The flap is a top flap provided on the top surface of the packaging box, and a slit connected to the fitting hole is formed at the peripheral edge of the fitting hole, and extends downward from the lower edge of the fitting hole. It extends towards . The fitting hole is formed from the body to the flap, and has the same width from an end on the body side to an end on the flap side. The flap includes a proximal end that overlaps the upper surface of a part of the other flap adjacent to the other flap, and a distal end part that overlaps the lower surface of the flap while wrapping around a part of the other flap. The vertical length between the lower end of the matching hole and the lower surface of the base end is equal to the sum of the thickness of the tip protrusion formed at the tip and the thickness of the other flap. .

According to the packaging box having such a configuration, by pushing in the vicinity of the slit, the part near the slit is tilted away from the body, so that the tip convex part can be easily pushed in. When the tip protrusion is pushed in, the tip protrusion separates from the fitting hole, so the closed state can be easily released. On the other hand, when the packaging box is used, the portion near the slit blends in with the surrounding area of the fitting hole, so it does not interfere with fitting of the tip convex portion. Therefore, a strong closed state can be maintained. Further, since it becomes easier to push the portion near the slit and the tip convex portion downward, the ability to close and release the lid is improved. Furthermore, it becomes easier to insert a finger into the fitting hole when the lid is released from the closed state. Further, since the lid is firmly closed, it is much more difficult to release the lid with the conventional structure, but according to the present invention, the lid can be released easily.

In the packaging box of the present invention, it is preferable that two slits are formed with an interval between them. With this configuration, the part between the two slits functions as a lid release tab, making it easier to tilt from the body, making it easier to push the tip convex downward, improving lid release performance. do.

Moreover, in the packaging box of the present invention, it is preferable that a bending guide line is formed from the tip of one of the two slits to the tip of the other slit. According to such a configuration, the portion between the slits can be easily bent, so that the ability to close and release the lid is further improved.

In the packaging box of the present invention, the closed state can be easily released while maintaining a strong closed state.

It is a perspective view of a packaging box concerning a first embodiment. FIG. 2 is a developed view of the packaging box according to the first embodiment. It is a sectional view of a packaging box concerning a first embodiment. FIG. 2 is a developed view of the main parts of the packaging box according to the first embodiment. FIG. 2 is a perspective view of the main parts of the packaging box according to the first embodiment. FIG. 2 is a perspective view of a main part of the packaging box according to the first embodiment, showing a state in which the lid is released. FIG. 2 is a cross-sectional view of a main part of the packaging box according to the first embodiment, showing a state in which the lid is released. FIG. 3 is a perspective view of a packaging box according to a second embodiment. FIG. 3 is a developed view of a packaging box according to a second embodiment.

A first embodiment of the present invention will be described in detail with reference to the drawings as appropriate. In this embodiment, a case will be described in which the present invention is applied to a packaging box 1 for accommodating long items such as green onions. In addition, in the following description, the front, back, left, and right directions are based on the state of the packaging box 1 shown in FIG. 1.

As shown in FIG. 2, the packaging box 1 of this embodiment is formed by folding a blank sheet 1a obtained by cutting out a single corrugated sheet into mountain folds along each fold line.
As shown in FIG. 1, the packaging box 1 includes a cylindrical body 10, an upper lid 20 formed at the upper opening 10a of the trunk 10, and a lower lid 30 that closes the lower opening 10b of the trunk 10. It is equipped with.

The body portion 10 is formed into a rectangular tube shape and includes a pair of left and right side walls 11 and 12 and a pair of front and rear end walls 13 and 14. The space surrounded by the left and right side walls 11 and 12 and the front and rear end walls 13 and 14 becomes a storage space in which stored items are stored.

The left side wall 11 is formed into a rectangle whose longitudinal direction is the front-rear direction. A glue margin 15 is continuous to the front edge of the left side wall 11 via a fold line L1a (see FIG. 2). A bent portion 15a is connected to the lower end of the glue margin 15 via a fold line L1e (see FIG. 2). The bent portion 15a is adhered to the upper surface of an inner flap 32, which will be described later. Further, a rear end wall 14 is connected to the rear edge of the left side wall 11 via a broken line L1b (see FIG. 2).

The rear end wall 14 is formed into a rectangle whose longitudinal direction is the left-right direction. As shown in FIGS. 4 and 5, a rectangular fitting hole 14a is opened in the upper part of the rear end wall 14. As shown in FIGS. A tip convex portion 22d of a rear outer short flap 22, which will be described later, is inserted into the fitting hole 14a (see FIGS. 1 and 5).
The right side wall 12 is connected to the right edge of the rear end wall 14 via a broken line L1c (see FIG. 2).

The right side wall 12 is formed into a rectangle whose longitudinal direction is the front-rear direction. As shown in FIG. 1, a front end wall 13 is connected to the front edge of the right side wall 12 via a broken line L1d (see FIG. 2).

The front end wall 13 is formed into a rectangle whose longitudinal direction is the left-right direction. A rectangular fitting hole 13a is opened in the upper part of the front end wall 13. A tip convex portion 22d of a front outer short flap 22, which will be described later, is inserted into the fitting hole 13a.
The body portion 10 is formed into a cylindrical shape by bonding a glue margin 15 to the inner surface of the front end wall 13 using an adhesive. At this time, the bent portion 15a at the tip of the glue margin 15 is adhered to the upper surface of the inner flap 32, which will be described later.

The upper lid 20 is a lid that covers the upper opening 10a of the body 10, as shown in FIG. A rectangular opening 20a whose longitudinal direction is the front-rear direction is formed in the center of the upper lid 20.
The upper lid 20 includes a pair of left and right inner short flaps 21, 21 connected to the upper edges of the left and right side walls 11, 12, and a pair of front and rear outer short flaps connected to the upper edges of the front and rear end walls 13, 14. It is composed of short flaps 22, 22. The inner short flaps 21, 21 and the outer short flaps 22, 22 are top flaps that constitute the top (upper lid 20).

The left and right inner short flaps 21, 21 are connected to the upper edges of the left and right side walls 11, 12 via a broken line L2. The left and right inner short flaps 21, 21 have a symmetrical shape.
Projections 21a, 21a projecting in the left-right direction are formed at both front and rear ends of the inner short flap 21. The inner short flap 21 has a shape in which both front and rear end portions protrude and the center portion in the front and back direction is depressed.

When the left and right inner short flaps 21, 21 are bent toward the top opening 10a with respect to the left and right side walls 11, 12 at the bending lines L2, L2, the left and right protrusions 21a, 21a are at intermediate positions in the left-right direction of the top opening 10a. It will be confronted with. Further, an opening 20a is formed between the intermediate portions of the left and right inner short flaps 21, 21 in the front-rear direction.

As shown in FIG. 2, the front and rear outer short flaps 22, 22 are connected to the upper edges of the front and rear end walls 13, 14, and have a base end 22a, an intermediate part 22b, and a distal end 22c. It is equipped with
In addition, since the front and rear outer short flaps 22, 22 have a symmetrical shape, in the following explanation, the rear outer short flap 22 will be explained in detail, and the explanation of the front outer short flap 22 will be omitted. .

The base end 22a of the rear outer short flap 22 is connected to the upper edge of the rear end wall 14 via a broken line L3a.
As shown in FIG. 2, the base end portion 22a is bent against the rear end wall 14 at the fold line L3a, so that the base end portion 22a is overlapped with the rear outer surface (upper surface) of the left and right inner short flaps 21, 21. The length of the base end portion 22a in the front-rear direction is the same as the length of the protrusion portion 21a in the front-rear direction.

As shown in FIG. 2, the intermediate portion 22b is connected to the outer edge of the base end portion 22a via a broken line L3b.
As shown in FIG. 3, the intermediate portion 22b is bent with respect to the base end portion 22a at a fold line L3b. The length of the intermediate portion 22b in the vertical direction is the same as the thickness of the inner short flap 21. Further, the length of the intermediate portion 22b in the left-right direction is the same as the length of the opening 20a in the left-right direction.

As shown in FIG. 2, the tip portion 22c is connected to the outer edge of the intermediate portion 22b via a broken line L3c.
The distal end portion 22c is bent relative to the intermediate portion 22b at the fold line L3c, so that the distal end portion 22c is overlapped with the inner surfaces (lower surfaces) of the protruding portions 21a, 21a of the left and right inner short flaps 21, 21. The length of the tip portion 22c in the front-rear direction is the same as the length of the protrusion 21a in the front-rear direction.

A tip convex portion 22d is provided protruding from the tip edge of the tip portion 22c. As shown in FIG. 3, the tip convex portion 22d is inserted into the fitting hole 14a of the rear end wall 14 from the inner surface side.

When forming the top lid 20 as shown in FIG. 1 with the left and right inner short flaps 21, 21 and the left and right outer short flaps 22, 22 open, first, open the left and right inner short flaps 21, 21. It is bent against the left and right side walls 11 and 12, and the left and right protrusions 21a and 21a are butted against each other.

Subsequently, the base end portions 22a of the front and rear outer short flaps 22, 22 are bent against the front and rear end walls 13, 14. Furthermore, by bending the intermediate portion 22b relative to the base end portion 22a and bending the distal end portion 22c relative to the intermediate portion 22b, the left and right protruding portions 21a are wrapped and surrounded by the outer short flaps 22. Then, the tip convex portion 22d is inserted into the fitting holes 13a, 14a (see FIG. 1) of the end walls 13, 14 from the inner side and fixed (see FIG. 3).

In this way, the left and right inner short flaps 21, 21 are held by the front and rear outer short flaps 22, 22, and the upper lid 20 having an opening 20a is formed in the upper surface opening 10a of the body portion 10.

In the packaging box 1 according to this embodiment, slits L10 are formed at the peripheral edges of the front and rear fitting holes 13a, 14a, respectively. Since the front and rear fitting holes 13a and 14a have a symmetrical shape, the rear fitting hole 14a will be described in detail in the following explanation, and the description of the front fitting hole 13a will be omitted.

The slit L10 is connected to the fitting hole 14a. The slits L10 extend downward from the lower edge of the fitting hole 14a, and are formed in two with an interval left and right. The area sandwiched between the left and right slits L10, L10 functions as a lid release tab 50. The lid release tab 50 is formed on the periphery of the fitting hole 14a, and can be tilted toward the inside of the packaging box 1. Providing the lid release tab 50 makes it easier to push out the tip protrusion 22d inserted into the fitting hole 14a. The two slits L10, L10 constitute the sides on both sides of the lid release tab 50. The two slits L10, L10 have the same length, are vertically formed, and are parallel to each other. The two slits L10, L10 are arranged with an interval of, for example, about 25 to 30 mm, so that a finger can be pushed between the slits L10, L10. The length of the slit L10 is, for example, about 10 mm, and is long enough to push the tip protrusion 22d out of the fitting hole 14a when the lid release tab 50 is bent. The length of the slit L10 is set according to the thickness of the cardboard.

A bending guide line L11 for bending the lid release tab 50 is connected to the lower end of the slit L10. The bending guide line L11 is formed from the lower end of one slit L10 to the lower end of the other slit L10. The bending guide line L11 is composed of ruled lines. When the lid release tab 50 is pushed in, the lid release tab 50 is tilted with the bending guide line L11 as a boundary.

The fitting hole 14a of this embodiment is formed from the body 10 to the outer short flap 22. Specifically, the lower end of the fitting hole 14a is located at the upper part of the end wall 14, and the upper end of the fitting hole 14a is located at the base end 22a of the outer short flap 22. Since the base end portion 22a is bent horizontally, the upper end portion of the fitting hole 14a is open upward. The vertical length between the lower end of the fitting hole 14a and the lower surface of the proximal end 22a of the outer short flap 22 is determined by the thickness of the tip convex portion 22d of the outer short flap 22 and the thickness of the protrusion 21a of the inner short flap 21. It is the length with the dimensions added.

The lower lid 30 is a lid that closes the lower opening 10b of the body 10.
As shown in FIG. 1, the lower lid 30 includes a pair of left and right outer flaps 31, 31 connected to the left and right side walls 11, 12, and a pair of front and rear inner flaps connected to the front and rear end walls 13, 14. 32, 32.

The left and right outer flaps 31, 31 are connected to the lower edges of the left and right side walls 11, 12 via a broken line L4. The left and right outer flaps 31, 31 have a symmetrical shape. The outer flap 31 is formed into a rectangle whose longitudinal direction is the front-rear direction. The length of the outer flap 31 in the front-rear direction is the same as the length of the side walls 11 and 12 in the front-rear direction.
When the left and right outer flaps 31, 31 are bent toward the lower opening 10b with respect to the side wall 11 (12) along the bending line L4, the tip edges of the left and right outer flaps 31, 31 are in the middle of the lower opening 10b in the left-right direction. placed in position. Then, the tips of the left and right outer flaps 31, 31 are brought into contact with each other.

The front and rear inner flaps 32, 32 are connected to the lower edges of the front and rear end walls 13, 14 via a fold line L5. The front and rear inner flaps 32, 32 have a symmetrical shape. The inner flap 32 is formed into a rectangle whose longitudinal direction is in the left-right direction. The length of the inner flap 32 in the left-right direction is the same as the length of the end walls 13 and 14 in the left-right direction.
When the front and rear inner flaps 32, 32 are bent toward the lower opening 10b with respect to the end wall 13 (14) along the fold line L5, they are overlapped on the upper side (inner side) of the left and right outer flaps 31, 31. Then, the lower surfaces (outer surfaces) of the inner flaps 32, 32 and the upper surfaces (inner surfaces) of the outer flaps 31, 31 are adhered to each other, and the lower lid 30 is brought into a closed state.

Next, the procedure for assembling the packaging box 1 will be explained.
First, in a factory or the like, the blank sheet 1a shown in FIG. 2 is folded along the respective fold lines L1a, L1c, and the adhesive 15 is adhered to the inner surface of the front end wall 13. The blank sheets 1a are shipped in this stacked state.

Next, the user folds the stacked blank sheets 1a along the respective fold lines L1b and L1d and unfolds them into a cylindrical shape to form the body 10.
Next, the body part 10 is arranged so that the upper surface opening 10a is on the upper side, and the left and right inner short flaps 21, 21 are bent against the left and right side walls 11, 12, and the protrusions 21a, 21a are butted against each other. . Furthermore, the front outer short flap 22 is bent against the front end wall 13, and the protruding part 21a of the inner short flap 21 is wrapped around the base end 22a and the distal end 22c, so that the front outer short flap 22 has a convex tip. The portion 22d is fixed to the fitting hole 13a of the front end wall 13. On the other hand, the rear outer short flap 22 is bent against the rear end wall 14, and the protrusion 21a of the inner short flap 21 is wrapped around the proximal end 22a and tip 22c. The distal end convex portion 22d is fixed to the fitting hole 14a of the rear end wall 14. As a result, the upper lid 20 having the opening 20a in the upper opening 10a of the body 10 is formed.

As described above, in the packaging box 1 of this embodiment, although the slits L10 and L10 are formed at the lower edges of the fitting holes 13a and 14a, when the packaging box 1 is used, the lid release tab 50 Since it blends into the peripheral area of the fitting hole, it does not interfere with the fitting of the tip convex portion 22d. Therefore, the strong closed state of the upper lid 20 can be maintained. Furthermore, in this embodiment, the base end 22a and the distal end 22c of the outer short flap 22 are overlapped with the protrusion 21a of the inner short flap 21, so the rigidity of the upper lid 20 is increased. As a result, the outer short flap 22 is difficult to deform and its tip convex portion 22d is reliably fitted into the fitting holes 13a, 14a, so that an even stronger closed state can be maintained.

In the lower lid 30, after the inner flaps 32, 32 are bent against the end walls 13, 14, the outer flaps 31, 31 are bent against the side walls 11, 12, and the upper surface of the outer flap 31 is placed on the lower surface of the inner flap 32. Formed by gluing.

Next, the effects of the present invention will be explained while explaining the procedure for releasing the closed state in order to disassemble the packaging box 1.
To release the lid from the closed state, the lid release tabs 50 on the peripheral edges of the fitting holes 13a and 14a as well as the tip surfaces of the tip protrusions 22d fitted in the fitting holes 13a and 14a are pressed against the packaging box 1. Push it downward inside. Then, the lid release tab 50 is separated from the end walls 13, 14 at the slits L10, L10, and tilts into the accommodation space, as shown in FIGS. 6 and 7. As a result, the tip protrusion 22d is pushed into the accommodation space, and the fitting between the tip protrusion 22d and the fitting holes 13a, 14a is released.
As described above, the lid release tab 50 is configured by forming the slits L10, L10 at the lower edges of the fitting holes 13a, 14a. When the lid release tab 50 is tilted toward the inside of the packaging box 1, the tip protrusion 22d can also be easily pushed in, so that the tip protrusion 22d can be easily removed from the fitting holes 13a, 14a. Therefore, the lid release tab 50 functions as an essential element for releasing the lid, and the tip convex portion 22d can be smoothly separated from the fitting holes 13a, 14a, so that the lid can be easily released from the closed state. I can do it.

Furthermore, in the present embodiment, since the bending guide line L11 is connected to the lower end of the slits L10 and L10, the lid release tab 50 is bent along the extrusion direction with the bending guide line L11 as a boundary. Therefore, the tip protrusion 22d can be pushed out along the direction in which it comes out of the fitting holes 13a, 14a, so the tip protrusion 22d can easily come out.

Furthermore, in this embodiment, the upper ends of the fitting holes 13a, 14a extend to the base end 22a, so the upper ends of the fitting holes 13a, 14a are open upward. This makes it easier to insert fingers into the fitting holes 13a, 14a because the upper edges of the fitting holes 13a, 14a do not get in the way. Therefore, the workability of closing and releasing the lid is improved.

Next, a second embodiment of the present invention will be described with reference to the drawings as appropriate.
In this embodiment, as shown in FIGS. 8 and 9, the length of the packaging box 101 in the front-rear direction is larger than that of the first embodiment, and the inner short flap 121 of the top lid 120 has a double structure.

The left and right inner short flaps 121, 121 are connected to the upper edges of the left and right side walls 111, 112 via a broken line L2. The inner short flap 121 includes a base end 121a, a distal end 121b, and a protrusion 21a.
In addition, since the left and right inner short flaps 121, 121 have a symmetrical shape, in the following explanation, the right inner short flap 121 will be explained, and the left inner short flap 121 will be described with the same reference numerals. omitted.

The base end 121a of the right inner short flap 121 is connected to the upper edge of the right side wall 112 via a broken line L2a. As shown in FIG. 8, the base end portion 121a is bent with respect to the right side wall 112 at the fold line L2a, so that it is overlapped with the inner surface (lower surface) of the right side of the front and rear outer short flaps 22, 22. The length of the base end portion 121a in the front-rear direction is the same as the length of the side wall 112 in the front-rear direction.

Projections 21a, 21a projecting leftward are formed at both front and rear ends of the base end 121a. The configuration of the protruding portion 21a is the same as that in the first embodiment.

The distal end portion 121b is connected to the outer edge of the proximal end portion 121a via a broken line L2b. The distal end portion 121b is bent with respect to the base end portion 121a at the fold line L2b, so that it is folded back toward the end wall 112 side and overlapped with the inner surface (lower surface) of the base end portion 121a. The tip portion 121b is provided between the front and rear protrusions 21a, 21a, and the length of the tip portion 121b in the front-rear direction is the same as the distance (inner dimension) between the front and rear protrusions 21a, 21a. . The inner short flap 121 has a distal end portion 121b bent and stacked on the lower side of the proximal end portion 121a, so that the protruding portions 21a, 21a at both the front and rear ends protrude, and the central portion in the front-back direction is depressed. There is.

A tip convex portion 121c is provided protruding from the tip edge of the tip portion 121b. The number and position of the tip protrusions 121c are determined depending on the length of the inner short flap 21 from front to back. In this embodiment, the tip convex portions 121c are provided at two locations and are arranged at symmetrical positions in the front and back. As shown in FIG. 8, the tip convex portion 121c is inserted into a fitting hole 112a formed in the right side wall 112 from the inner side.

The fitting hole 112a is formed in the upper part of the right side wall 112, as shown in FIGS. 8 and 9. The fitting hole 112a is formed into a rectangle whose longitudinal direction is the front-rear direction. The fitting hole 112a is formed from the side wall 112 of the body portion 110 to the base end portion 121a of the inner short flap 121. Specifically, the lower end of the fitting hole 112a is located at the upper part of the side wall 112, and the upper end of the fitting hole 112a is located at the base end 121a. Since the base end portion 121a is bent horizontally, the upper end portion of the fitting hole 112a is open upward. The vertical length between the lower end of the fitting hole 112a and the lower surface of the base end portion 121a is the same as the thickness dimension of the tip convex portion 121c of the inner short flap 121.

A slit L10 is formed at the peripheral edge of the fitting hole 112a, as in the first embodiment. Two slits L10 are formed extending downward from the lower edge of the fitting hole 112a. The two slits L10, L10 have the same length, are vertically formed, and are parallel to each other. A bending guide line L11 is connected to the lower end of the slit L10. The bending guide line L11 is formed across the lower ends of the slits L10 and L10, and is horizontal. The portion surrounded by the slits L10, L10 and the bending guide line L11 becomes the lid release tab 50.
Note that other configurations are the same as those in the first embodiment, so the same reference numerals are given and explanations are omitted.

As described above, in the packaging box 101 of this embodiment, not only the outer short flap 22 but also the inner short flap 121 has a double structure in which the distal end 121b is folded back and overlapped with the proximal end 121a. , the rigidity of the upper lid 120 is increased. As a result, the outer short flap 22 is difficult to deform, and its tip convex portion 22d is reliably fitted into the fitting holes 13a, 14a, and the tip portion 121b of the inner short flap 121 is also reliably fitted into the fitting holes 111a, 112a. Therefore, an even stronger closed state can be maintained. Furthermore, since the inner short flap 121 has a higher rigidity, its length in the front-rear direction can be increased, and long objects can be accommodated. Furthermore, it is also possible to stack the packaging boxes 101 in multiple stages.

Since the fitting holes 111a and 112a are formed with the slit L10 and the bending guide line L11, the closed state of the inner short flap 121 can be easily released in the same manner as the outer short flap 22.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and can be modified as appropriate without departing from the spirit thereof. For example, in the embodiment, two slits L10 are provided parallel to each other, but the invention is not limited to this. The shape of the slits may be other shapes, such as, for example, a V-shape in which the spacing becomes wider toward the bottom, an inverted V-shape in which the spacing narrows toward the bottom, or the like. Alternatively, it may be a crank-shaped slit that extends horizontally from the lower edge of the fitting hole and bends downward from its tip. Furthermore, the slit may be curved.

Further, in the embodiment, two slits are provided, but a single slit or three or more slits may be provided.

Furthermore, in the embodiment, the fitting holes 13a, 14a have a rectangular shape, but are not limited to this. Other shapes, such as an ellipse or a polygon, may be used as long as the distal end convex portion can be fitted together and release of the lid from the closed state is not hindered.

Further, in the embodiment, the bending guide line L11 is formed of a ruled line, but is not limited to this. Other lines such as half-cut lines and perforations may also be used. However, it is preferable to use ruled lines because the lid release tab 50 will not be separated and no dust will be generated.

Furthermore, in the embodiment, the tips of the protrusions 21a, 21a of the inner short flaps 21, 21 are butted against each other, but the present invention is not limited to this. It may be a specification.

1 Packaging box 10 Body 13a Fitting hole 14a Fitting hole 21 Inner short flap 21a Projection 22 Outer short flap (top flap)
22a Base end portion 22c Tip portion 22d Tip convex portion 50 Closing release tab L10 Slit L11 Bending guide wire 101 Packaging box 110 Body portion 111a Fitting hole 112a Fitting hole 121 Inner short flap (top flap)
121a Base end portion 121b Tip portion 121c Tip convex portion

Claims (3)

comprising a cylindrical body and a flap connected to the body,
The tip convex portion provided at the tip of the flap is fitted into the fitting hole formed in the body around the proximal end position of the flap, thereby maintaining the closed lid state in which the flap is fixed. In the packaging box,
The flap is a top flap provided on the top of the packaging box,
A slit connected to the fitting hole is formed at a peripheral edge of the fitting hole and extends downward from a lower edge of the fitting hole,
The fitting hole is formed from the body to the flap, and has the same width from an end on the body side to an end on the flap side,
The flap includes a proximal end portion that overlaps the upper surface of a portion of another adjacent flap, and a distal end portion that overlaps the lower surface of the other flap while wrapping around a portion of the other flap,
The vertical length between the lower end of the fitting hole and the lower surface of the base end is the sum of the thickness of the tip protrusion formed at the tip and the thickness of the other flap. A packaging box characterized by : The packaging box according to claim 1 , wherein two slits are formed with an interval between them. 3. The packaging box according to claim 2 , wherein a bending guide line is formed from the tip of one of the two slits to the tip of the other slit.

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