JP4881099B2 - Packaging box - Google Patents

Description

  The present invention relates to a packaging box formed from a sheet material.

2. Description of the Related Art Conventionally, as a packaging box for storing products, a sheet box such as cardboard or a synthetic resin sheet assembled in a box shape is known. The packaging box is formed by appropriately assembling a development sheet obtained by punching a sheet material into a predetermined shape, and includes a top-opening box body capable of storing products therein, and a crease line formed on the upper edge of the box body. And a lid plate that is rotatably connected to the box body and opens and closes the opening of the box body.
A structure as shown in FIGS. 8A and 8B is known as an opening / closing mechanism for the cover plate of such a packaging box.
The packaging box 80 in FIG. 8A includes a cover plate 82 that is rotatably connected to a rear wall plate of a top-opening box main body 81 via a crease line, and upper and lower side wall plates of the box main body 81. A side flap plate 83 connected to the edge via a crease line, and a lid flap plate 85 extending from the lid plate 82 is inserted between the side flap plate 83 and the front wall plate 84. Thus, the upper surface opening 81 b of the box body 81 is opened and closed by the lid plate 82. Note that the packaging box 80 having such a structure is disclosed in FIG.
The packaging box 90 of FIG. 8B includes a lid plate 92 that is rotatably connected to the rear wall plate of the top-opening box main body 91 via a crease line, and upper and lower side wall plates of the box main body 91. A side flap plate 93 continuously provided on the edge via a crease line, and by inserting a locking piece 94 extending from the lid plate 92 into the cut portion 95 of the front wall plate of the box body 91 The upper surface opening 91b of the box body 91 is opened and closed by the lid plate 92. A packaging box 90 having such a structure is disclosed in FIG.

Any of the above packaging boxes has a structure in which the cover plate opens and closes by rotating with respect to the back wall plate at the crease line.
By the way, in order to make it easy to take out the stored product from the upper surface opening, as shown in FIG. 8A, the lid plate 82 and the side flap plate 83 are parallel to the back wall plate and the side wall plate. It is preferable that it is open to the extent possible.
However, the cover plate of the packaging box has a crease because it is folded at about 90 degrees with respect to the back wall plate at the crease line during distribution and storage. Accordingly, when the hand is released from the cover plate after the cover plate is opened, the cover plate 82 is lowered as shown in FIG. For this reason, the upper surface opening part 81b of the box main body 81 cannot be opened largely, and there is a problem that it is difficult to take out the stored product.
On the other hand, as shown in FIG. 9B, the upper surface opening 81b of the box body 81 can be largely opened by rotating the closed lid plate 82 by 180 degrees or more with respect to the rear wall plate. However, if the operation of rotating the lid plate 82 greatly is repeated, the crease line 82a may be cracked and the lid plate 82 may be broken.

Also, this type of packaging box is usually provided with a side flap plate to prevent a product from coming out of the gap between the lid plate and the side wall plate, or foreign matter entering through the gap. . The side flap plate is bent inside the closed lid plate. For this reason, the upper surface opening of the box body cannot be opened unless not only the lid plate but also the side flap plate is opened.
On the other hand, when the product is taken out and then resealed, each of the lid plate and the side flap plate must be bent to close the upper surface opening.

JP 2006-51978 A JP 2006-111291 A

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a packaging box formed of a sheet material, which can greatly open the opening of the box body when the lid is opened, and can easily improve the stored product.

The present invention is a packaging box formed of a sheet material, the upper surface having a back wall plate, both side wall plates connected to the back wall plate, and front wall plates connected to the side edges of the both side wall plates. An opening-type box body, a lid plate that is connected to the upper edge of the back wall plate via a first crease line, and closes the upper surface opening of the box body by bending at the first crease line ; An auxiliary plate that pushes the lid plate away from the upper surface opening on the upper edge of the side wall plate and the side edge of the lid plate. An auxiliary plate that bends inward when the upper surface opening is closed is provided continuously, and incisions are formed on both sides of the boundary between the lid plate and lid flap plate, and the auxiliary plate projects forward. The cover plate is provided by inserting a notch in the cover plate into the protrusion when the upper surface opening is closed. Locked to the box body, and the lid plate by the repulsive force of the auxiliary plate upon releasing the locking by pulling the lid flaps to provide a packaging box standing upright.

The packaging box stores the product in the box body, bends the lid plate to close the upper surface opening of the box body, and locks the closed lid plate by fitting the cut portion into the protrusion .
In such a packaging box, since an auxiliary plate is connected to the upper edge of the side wall plate and the lid plate, the auxiliary plate can prevent a gap from being generated between the side wall plate and the lid plate. That is, the auxiliary plate also functions as a side flap plate of the conventional packaging box.
Further, since the auxiliary plate is raised by a repulsive force when the lid flap plate is lifted to release the locking, the lid plate can be pushed up to greatly open the upper surface opening of the box body. Therefore, the product can be easily taken out from the opened upper surface opening.
In addition, the auxiliary plate connected to the lid plate bends inward following the lid plate when it is folded. Therefore, when resealing, the folding operation of the lid plate and the auxiliary plate is performed separately. There is no need to do it. Further, after taking out the product, by locking the lid plate while closing the upper opening by bending the cover plate, it is possible to re-seal the packaging box.

In a preferred aspect of the present invention, a crease line is formed in the plane of the auxiliary plate from the intersection of the side wall plate and the cover plate toward the outer edge of the auxiliary plate, and the crease line is formed on the outer edge of the auxiliary plate. There is provided the above packaging box in which a cutout portion is formed that is cut out in a right-and-left slanting manner around the center .

Such a packaging box is preferable because the notch is formed on the outer edge of the auxiliary plate, so that the auxiliary plate is easily folded.

In a preferred aspect of the present invention, there is provided the packaging box in which the first crease line is formed in an arc line shape.
Thus, since the 1st crease line is formed in the shape of a circular arc, the lid plate bent in the 1st crease line becomes easy to jump up.

The packaging box of this invention can close the upper surface opening part of a box main body with a cover plate, and at the time of a lid opening, a cover plate jumps up and can open the upper surface opening part of a box main body largely.
Therefore, according to the packaging box of this invention, the stored goods can be taken out easily.
Also, packaging Sobako of the present invention, the auxiliary plate no gap occurs in the side wall plate and the cover plates by addition, at the time of resealing, can be closed only by the auxiliary plate bending operations of the cover plate.

The present invention will be described below with reference to the accompanying drawings.
1 to 3, reference numeral 1 denotes a self-supporting packaging box formed from a sheet material. The packaging box 1 has a plurality of wall plates and a top-opening box body 2 whose bottom surface is closed; a lid plate 3 connected to the upper edge of one wall plate of the box body 2; It has.
The “upper surface” refers to a surface located on an upper side of the packaging box 1 when the packaging box 1 is self-supporting.

The sheet material is not particularly limited as long as it has sufficient strength to maintain the box shape, and a known sheet can be used. Examples of the sheet material include cardboard, synthetic resin sheet, laminated sheet of paper and synthetic resin sheet, and laminated sheet of paper or synthetic resin sheet and metal foil.
When using thick paper, the thing of thickness about 0.5-2 mm is preferable, and when using a synthetic resin sheet, the thing of thickness about 0.4-1 mm is preferable.
The resin material of the synthetic resin sheet is not particularly limited, and examples thereof include polyolefin resins such as polypropylene and polyethylene, polystyrene resins, and polyester resins.

The illustrated packaging box 1 is formed in a rectangular parallelepiped shape.
The packaging box 1 is formed in a rectangular parallelepiped shape by punching and assembling one sheet material into a predetermined shape. Therefore, the constituent plates of the packaging box 1 such as the box body 2, the lid plate 3, and the auxiliary plate 5, which will be described later, are integrally formed.
The box body 2 is connected to a rectangular rear wall plate 21, a pair of side wall plates 22, 22 connected to both side edges of the back wall plate 21, and side edges of both side wall plates 22, 22. A square columnar cylindrical body including the front wall plate 23, and a lower wall plate 25 that closes the lower surface opening 24a of the rectangular columnar cylindrical body.
The back wall plate 21, the pair of side wall plates 22, and the front wall plate 23 are bent at right angles along the crease lines 40 formed at the respective boundary portions, and are continuously provided.
Moreover, the upper center part of the front wall board 23 is cut out by predetermined shape (for example, semicircular arc shape etc.), and the cutting part 26 is formed. The cut portion 26 is formed to a size that allows the upper part of the product to be looked out.

The lower surface opening 24a of the box body 2 only needs to be closed by the lower surface wall plate 25 so that the product stored in the box body 2 does not go outside. Therefore, various structures can be adopted for the closing structure of the box body 2 by the lower wall plate 25.
For example, as shown in FIG. 2, a lower wall plate 25 is connected to the lower edge of the rear wall plate 21 of the box body 2, and the lower flap plates 27, 27 are attached to the lower edges of the side wall plates 22, 22 of the box body 2. Are respectively provided, and an opposing flap plate 28 is provided continuously at the lower edge of the front wall plate 23.
Both lower flaps 27, 27 are bent inward at right angles, the opposing flap plate 28 is bent at a right angle so as to overlap, and the lower wall plate 25 is bent at a right angle so as to overlap with the opposing flap plate 28. By bonding the wall plate 25 to the opposing flap plate 28, the lower surface opening 24a of the box body 2 is closed.
In addition, the structure which obstruct | occludes the lower surface opening part 24a of the box main body 2 is not restricted to the said aspect, In addition, a conventionally well-known structure is employable. For example, a structure may be adopted in which an insertion flap plate is extended on the lower wall plate, and the lower opening of the box body is closed by inserting the insertion flap plate between the lower edge of the front wall plate and the lower flap plate (this The structure is the same as the closing structure of the upper surface opening of the conventional box body shown in FIG.

Next, the cover plate 3 is formed in a size capable of closing the upper surface opening 24b of the cylindrical body. The lid plate 3 is connected to the upper edge of the back wall plate 21. A crease line 41 is formed at the boundary between the cover plate 3 and the back wall plate 21 (in order to distinguish the crease line 41 formed between the cover plate 3 and the back wall plate 21 from other crease lines). "First crease line"). The cover plate 3 can be bent at the first crease line 41. Accordingly, the upper surface opening 24b is closed by the cover plate 3 by bending the cover plate 3 along the first crease line 41 toward the upper surface opening 24b side of the box body 2 (in the direction of the arrow shown in FIG. 3). On the other hand, the upper surface opening 24b is opened by rotating the cover plate 3 in the first crease line 41 in a direction away from the upper surface opening 24b.
The first crease line 41 may be formed in a straight line shape, but is preferably formed in a circular arc line shape. In particular, as shown in the drawing, the first crease line 41 is more preferably formed in an arcuate line shape that swells toward the back wall plate 21 side. This is because the cover plate 3 bent at the first crease line 41 is likely to jump up because the first crease line 41 is formed in a circular arc shape.

A lid flap plate 31 is extended from the leading edge of the lid plate 3 (the edge facing the first crease line 41). The shape and size of the lid flap plate 31 are not particularly limited as long as the lid flap plate 31 is formed to a size that can be picked by hand. But it is preferable that the lid | cover flap board 31 is extended by the substantially same width as the width | variety of the lid | cover board 3. FIG. Moreover, it is preferable that the front-end edge of the lid | cover flap board 31 is formed in circular arc shape. A crease line 40 is formed at the boundary between the lid flap plate 31 and the lid plate 3 so that the lid flap plate 31 can be bent with respect to the lid plate 3.
Further, on both sides of the boundary portion between the cover plate 3 and the cover flap plate 31, a linear cut portion 32 is formed on the extended line of the crease line 40. The linear cut portion 32 can be engaged with and disengaged from the protruding portion 51 protruding from the box body 2.
When the cover plate 3 is bent to close the upper surface opening 24 b of the box body 2, the cover plate 3 is locked to the box body 2 by fitting the cut portion 32 into the protrusion 51 of the box body 2. The Due to the locking by the protrusion 51 of the box body 2, the lid plate 3 does not move away from the upper surface opening 24 b of the box body 2, and the closed state of the upper surface opening 24 b by the lid plate 3 is maintained.

Next, the lid opening assisting means that is a characteristic part of the present invention will be described.
The opening assistance means has a function of pushing up the lid 3 that closes the upper surface opening 24b of the box body 2 in a direction away from the upper surface opening 24b.
An auxiliary plate 5 can be used as the opening assistance means. The auxiliary plate 5 is provided between the side edge of the lid plate 3 and the upper edges of the side wall plates 22 and 22. As shown in FIG. 4A, the auxiliary plate 5 bends inward when the lid plate 3 is closed. On the other hand, when the cover plate 3 is opened, the auxiliary plate 5 stands by the repulsive force of the sheet material as shown in FIG.
Specifically, two auxiliary plates 5 are provided on the left and right. One auxiliary plate 5 is connected to one side edge of the cover plate 3 and the upper edge of one side wall plate 22. The other auxiliary plate 5 is connected to the other side edge of the lid plate 3 and the upper edge of the other side wall plate 22. Since the left and right auxiliary plates 5 and 5 have a contrasting structure, only one auxiliary plate will be described, and description of the other auxiliary plate will be omitted.
The shape of the auxiliary plate 5 is not particularly limited as long as the auxiliary plate 5 stands between the lid plate 3 and the side wall plate 22 with the lid plate 3 opened. For example, the auxiliary plate 5 is formed in a substantially right-angled isosceles triangle shape. Has been. Two sides sandwiching the right angle of the substantially right-angled isosceles triangle are formed to have substantially the same length as the length of the side edge of the cover plate 3 and the length of the upper edge of the side wall plate 22.

A crease line 42 is formed at the boundary between the auxiliary plate 5 and the side wall plate 22 (in order to distinguish the crease line 42 formed between the auxiliary plate 5 and the side wall plate 22 from other crease lines). "The second crease line").
The second crease line 42 may be formed in a straight line shape, but is preferably formed in an arc line shape. In particular, the second crease line 42 is more preferably formed in a circular arc shape that swells toward the auxiliary plate 5 as shown in the drawing. This is because the folded lid plate 3 is likely to jump up because the second crease line 42 is formed in a circular arc shape.
A crease line 43 is formed at the boundary portion between the auxiliary plate 5 and the cover plate 3 (in order to distinguish the crease line 43 formed between the auxiliary plate 5 and the cover plate 3 from other crease lines " 3 fold ruled lines). The third crease line 43 is formed in a straight line shape. But you may form in circular arc shape.

Further, a crease line 44 is formed in the plane of the auxiliary plate 5 from the intersection of the side wall plate 22 and the cover plate 3 toward the outer edge of the auxiliary plate 5 (folds formed in the plane of the auxiliary plate 5). The ruled line 44 is referred to as a “fourth folded ruled line” to distinguish it from other folded ruled lines). The fourth crease line 44 is formed in a straight line, and is preferably formed at a position that divides the auxiliary plate 5 into approximately two equal parts.
As shown in FIG. 4 (a), when the cover plate 3 is bent, the auxiliary plate 5 follows the cover plate 3 and is folded at the second crease line 42 and the third crease line 43, and The valley is folded at the fourth crease line 44 and folded inside.

The auxiliary plate 5 has a protruding portion 51 protruding therefrom. The protrusion 51 is formed by extending a part of the outer edge of the auxiliary plate 5 (a part of the outer edge near the side wall plate 22).
The protrusion 51 protrudes forward from the upper edge of the front wall plate 23 when the auxiliary plate 5 is folded. By fitting the cut portion 32 of the bent lid plate 3 into the projection 51, the lid plate 3 is locked and the closed state of the lid plate 3 is maintained (see also FIG. 4B).

In addition, as shown in FIG. 3, the center part of the outer edge of the auxiliary | assistant board 5 has the notch part 52 notched in the left-right inclination shape centering on the 4th crease line 44. As shown in FIG. The notch 52 is not always necessary, but the auxiliary plate 5 can be easily folded by providing the notch 52.
Further, in the surface of the auxiliary plate 5, a punched hole 53 is formed by cutting out the intersection of the side wall plate 22 and the cover plate 3. Such a punched hole 53 is not always necessary, but by providing the punched hole 53, it is possible to prevent concentration of the three bases of the auxiliary plate 5, the side wall plate 22, and the cover plate 3. For this reason, deformation of the cover plate 3 can be prevented. The punched holes 53 are not limited to the circular shape as shown in the figure, and can be formed in an appropriate shape such as an elliptical shape or a triangular shape.

Each of the crease lines 40, 41, 42, 43, 44 is provided for bending the sheet material along the crease lines 40, 41, 42, 43, 44.
Each crease line 40 to 44 is not particularly limited as long as it meets the purpose, and a known means can be adopted. For example, as each crease line 40-44, a press line, a half cut line, a sewing machine line, etc. can be used. When the sheet material is mainly cardboard, the crease lines 40 to 44 are preferably pressing lines, and when the sheet material is mainly a synthetic resin sheet, the crease lines 40 to 44 are preferably half cut lines. .
In addition, as shown to Fig.5 (a), a press line pushes the surface of a sheet | seat material using a disk roller etc., and forms a linear dent in a sheet | seat material. As shown in FIG. 5B, the half-cut line is formed by cutting the sheet material in the thickness direction so as not to divide the sheet material using a cutter or the like. Half-cut lines are also called V notches. The perforations are formed by intermittently forming through holes (short-line through holes or circular through holes) penetrating the sheet material, and the perforations are similar to intermittent holes opened by a sewing needle.

Next, the expansion | deployment sheet | seat 100 which comprises the said packaging box 1 is shown in FIG.
The unfolded sheet 100 is formed by punching or cutting a single sheet material into a predetermined shape.
In the spread sheet 100 shown in the figure, the same reference numerals as those described above are assigned to the portions corresponding to the wall plates and the portions shown in the description of the configuration of the packaging box 1. In addition, 29 shows the paste margin board which did not come out by the structure description of the said packaging box 1. FIG. The glue margin plate 29 extends from the side edge of the front wall plate 23.
In order to produce the packaging box 1 using the unfolded sheet 100, the front wall plate 23, the side wall plates 22, the back wall plate 21, and the adhesive margin plate 29 are respectively bent at right angles along the crease line 40. A glue margin plate 29 is bonded to the inside of the side wall plate 22. In order to close the opening on the lower surface of the obtained cylindrical body, both lower flap plates 27, 27 are bent inward at right angles, and the opposing flap plate 28 is similarly bent inward at right angles. Then, the lower wall plate 25 is bent inward at a right angle, the inner surface of the lower wall plate 25 is overlaid on the opposing flap plate 28, and the overlapped portion is bonded with an adhesive. The product is put into the obtained top-opening box body. Next, the cover plate 3 is bent at the first crease line 41. When the cover plate 3 is bent, the auxiliary plate 5 is pushed by the cover plate 3, and is folded at the second fold line 42 and the third fold line 43 and at the fourth fold line 44. The When the auxiliary plate 5 is folded inward in this way, the auxiliary plate 5 becomes parallel to the upper edge of the front wall plate 23, and the protruding portion 51 of the auxiliary plate 5 protrudes from the upper edge of the front wall plate 23. Finally, the notch 32 of the cover plate 3 is fitted into the protruding portion 51 so that the cover plate 3 is locked and the upper surface opening is closed by the cover plate 3.
However, in mechanical manufacturing, the order may be different. For example, there may be a case where a product is put after a glue plate is bonded to produce a cylindrical body, and then the lower surface opening or / and the upper surface opening are closed. Therefore, the procedure for assembling the packaging box and storing the product according to the present invention is not limited to the procedure described in detail above.

In the packaging box 1, the upper surface opening 24 b is closed by the lid plate 3 in a state in which a product is stored. In addition, in order to seal the cover plate 3 of the packaging box 1, a seal label is pasted over the cover flap plate 31 and the front wall plate 23 of the cover plate 3 or the cover flap plate 31 is attached to the front wall as necessary. The plate 23 may be spot-bonded. Moreover, you may coat | cover the circumference | surroundings of the packaging box 1 using an overlap film.
The product stored in the packaging box 1 is not particularly limited, and various products such as stick-shaped products such as stick sugar, individually packed granular products such as bag candy, and non-packaged products are stored. can do.

As shown in FIG. 7A, the packaging box 1 is formed by pulling up the lid flap plate 31 of the lid plate 3 so that the cut portion 32 and the protruding portion 51 of the box body 2 (these correspond to the engaging means). Is disengaged. Then, since the auxiliary plate 5 folded at the second crease line 42, the third crease line 43, and the fourth crease line 44 tries to return to a flat shape by the repulsive force, the repulsive force of the auxiliary plate 5 As a result, the lid plate 3 is pushed up. On the other hand, since the lid plate 3 is bent at the first crease line 41, the lid plate 3 itself repels and tries to return to be parallel to the rear wall plate 21. Due to the pushing-up action of the auxiliary plate 5 and the repulsion of the cover plate 3 itself, the disengaged cover plate 3 automatically jumps upward as shown in FIG. The part 24b is greatly opened.
And after taking out goods from the open upper surface opening part 24b, the cover plate 3 is bend | folded, and the notch part 32 of the cover plate 3 is inserted in the protrusion part 51. The upper surface opening 24b can be closed.

In addition, the packaging box of this invention is not restricted to what was shown to the said embodiment, It can change variously in the range which this invention intends.
In the above embodiment, the protruding portion 51 protrudes from a part of the auxiliary plate 5 as a locking means for locking the lid plate 3. For example, the protruding portion protrudes from a part of the front wall plate 23. May be.
In addition, a linear cut portion is formed in the front wall plate 23, and a part of the lid flap plate 31 is fitted into the cut portion so that the closed lid plate 3 is locked to the box body 2. Good.

  Furthermore, in the said embodiment, although the packaging box 1 is comprised by assembling the expansion | deployment sheet | seat which punched out the sheet material in the predetermined shape suitably, the packaging box 1 of this invention is a sheet material. It is not limited to the case where it is configured. For example, the box body 2 and the cover plate 3 are formed of one sheet material, and the auxiliary plate 5 is formed of another sheet material, and the adhesive margin plate extending from the auxiliary plate 5 is used as the side wall plate 22 and The packaging box 1 may be configured by adhering to the lid plate 3 and connecting the auxiliary plate 5 between the plates 22 and 3. Similarly, the box body 2 and the auxiliary plate 5 are formed of one sheet material, the lid plate 3 is formed of another sheet material, and the glue margin plate extended from the lid plate 3 is used as the back wall. The packaging box 1 may be configured by adhering to the plate 21 and connecting the lid plate 3 continuously. In addition, the box body 2, the cover plate 3 and the auxiliary plate 5 are each formed of a single sheet material, and a paste sheet appropriately extended from these plates is appropriately bonded to each plate, whereby the packaging box 1 is It may be configured. In addition, when connecting each board, it is preferable to adhere | attach each board via a paste margin board, but each board can also be connected using an adhesive tape without using a paste margin board. For example, the box body 2 and the cover plate 3 are formed of one sheet material, and the auxiliary plate 5 is formed of another sheet material, and the upper edge of the auxiliary plate 5 and the side wall plate 22 and the auxiliary plate 5 and the cover are formed. Adhesive tapes may be attached so as to straddle the side edges of the plate 3, and the plates 5 and 22 and the plates 5 and 3 may be provided continuously.

Furthermore, in the said embodiment, although the box main body 2 is formed in the rectangular parallelepiped shape (square column shape), it can also be formed in a pentagonal column shape, hexagonal column shape, etc.
In the above embodiment, the auxiliary plate 5 is provided between the side wall plates 22 and 22 and the lid plate 3, but is provided between either one of the side wall plates 22 and the lid plate 3. May be. That is, the auxiliary plate 5 is preferably provided in a pair of left and right as in the above embodiment, but only one of them may be provided.

The perspective view which looked at the packaging box concerning the present invention from the front side. The perspective view which looked at the packaging box of the state which opened the lower surface opening part from the back side. The perspective view which looked at the packaging box of the state which opened the upper surface opening part from the front side. (A) is a partially omitted cross-sectional view cut along line AA in FIG. 1, and (b) is a partially omitted cross-sectional view cut along line BB in FIG. Reference sectional drawing which shows the example of formation of a crease line. The top view which shows the expansion | deployment sheet | seat which comprises the packaging box which concerns on this invention. However, the crease lines are indicated by broken lines. (A) is a front perspective view which shows the state which released | engaged the cover plate and the box main body, (b) is a front perspective view which shows the state which the cover plate bounced up. (A), (b) is a conventional packaging box, Comprising: The perspective view which looked at the packaging box of the state which opened the upper surface opening part from the front side. (A) is the front perspective view of the state which opened the lid plate of the conventional packaging box, (b) is the front perspective view of the state which forcedly bent the lid plate of the conventional packaging box.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Packaging box, 2 ... Box main body, 21 ... Back wall board, 22 ... Side wall board, 23 ... Front wall board, 24b ... Upper surface opening part (opening part), 3 ... Cover board, 32 ... Notch part, 41 ... First crease line, 5 ... auxiliary plate, 51 ... projection, 100 ... deployed sheet

Claims (3)

A packaging box formed from a sheet material, the box having an upper surface that has a back wall plate, both side wall plates connected to the back wall plate, and front wall plates connected to side edges of the both side wall plates . The main body, a lid plate that is connected to the upper edge of the back wall plate via a first crease line, and is folded at the first crease line to close the top opening of the box body, and extends to the leading edge of the lid plate. A lid flap plate provided ,
An auxiliary plate that pushes the lid plate away from the upper surface opening is connected to the upper edge of the side wall plate and the side edge of the lid plate, and the auxiliary plate that bends inward when the upper surface opening is closed by the lid plate. Has been established,
Incisions are formed on both sides of the boundary between the lid plate and lid flap plate,
The auxiliary plate is provided with a protrusion protruding forward,
The cover plate is locked to the box body by fitting the cut portion of the cover plate into the protrusion when the upper surface opening is closed, and the auxiliary plate is released when the cover flap is lifted to release the lock. A packaging box characterized in that the lid plate stands up due to the repulsive force of . In the surface of the auxiliary plate, a crease line is formed from the intersection of the side wall plate and the cover plate toward the outer edge of the auxiliary plate, and the outer edge of the auxiliary plate is inclined right and left around the crease line. The packaging box according to claim 1, wherein a notched part is formed . The packaging box according to claim 1 or 2, wherein the first crease line is formed in an arc line shape.

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