JP7437240B2 - packaging box - Google Patents

Description

Applicable to Article 30, Paragraph 2 of the Patent Act Sold to Toyo Shinyaku Co., Ltd. on February 25, 2020

The present invention relates to packaging boxes.

A packaging box is known in which the upper and lower ends of four surrounding walls are closed off by a plurality of flaps that are connected to each wall (Patent Document 1). An insertion portion having a cut and raised structure is provided on both sides of the first flap, and an insertion portion that is inserted into the insertion portion is provided on both sides of the second flap. The second flap is provided with insertion auxiliary fold lines (lead lines) along both edges. By bending the second flap along the insertion auxiliary fold line, the tip of the insertion portion is directed toward the inserted portion, making it easier to insert the insertion portion into the interior through the insertion portion.

Japanese Patent Application Publication No. 2005-8221

However, in the above-mentioned packaging box, the second flap is lifted up due to the folding tendency at the insertion auxiliary crease line (lead crease), and the insertion part is pulled out from the inserted part due to vibration during transportation, for example, and the package is opened. There was a risk that it would get lost.

In order to solve the above problems, the present invention provides a packaging box that can suppress lifting of the lid due to folding.

In order to achieve the above object, the packaging box of the present invention includes a peripheral wall formed in a cylindrical shape, and a lid part that is connected to at least one end of both axial ends of the peripheral wall and closes an opening in the peripheral wall. The lid portion includes a first flap that is bent inside the peripheral wall, and a second flap that is bent inside the peripheral wall and overlapped on the outside of a part of the first flap. , the first flap has an insertion part formed to penetrate in the thickness direction, and the second flap has an insertion piece formed on the distal end side and inserted into the insertion part; an insertion auxiliary fold line formed on the proximal end side of the insertion piece and for folding the second flap into a mountain when inserting the insertion piece into the inserted part; a correction piece defined by a cutting line formed so as to protrude toward at least one side of the proximal end, and in a state where the insertion piece is inserted into the inserted part, the correction piece: The second flap is pushed in and comes into contact with the edge of the punched hole along the contour of the cutting line with a frictional force due to its own restoring force, generating a correction force that corrects the folding of the second flap at the insertion auxiliary fold line. let

In this case, the correction piece may have a shape that becomes wider as it moves away from the insertion auxiliary fold line.

In this case, at least one of the second flap and the correction piece may be formed with a release opening for pulling out the pushed correction piece.

In this case, a pair of the first flaps are provided on a pair of first side walls facing each other in a first direction of the peripheral wall, and a pair of the second flaps are provided on a pair of first side walls facing each other in a first direction of the peripheral wall. a pair of second side walls are provided, and are stacked on both sides of the pair of first flaps in the second direction, and the inserted portion is opened on both sides of the pair of first flaps in the second direction. including two pairs of insertion holes, and two pairs of the insertion pieces are formed on the pair of the second flaps,
At least one pair of the two pairs of insertion pieces has a pair of protrusions protruding so as to approach each other, and the insertion pieces corresponding to the insertion pieces having the protrusions The hole may have a beveled edge that is beveled to intersect the protrusion.

In this case, the first flap and the second flap may be provided on a pair of first side walls facing each other in the first direction of the peripheral wall.

In this case, a third flap that is connected to one end of a pair of first side walls facing each other in the first direction of the peripheral wall and is bent inward of the peripheral wall and a third flap that intersects in the first direction of the peripheral wall. It further includes a fourth flap that is connected to one end of the pair of second side walls facing each other in the second direction and is bent inward of the peripheral wall, and the first flap is The second flap is connected to the other end of the pair of second side walls, and the second flap forms the insertion piece. The first flap, the fourth flap, the third flap, and the second flap are folded inward in the peripheral wall in this order. In a state where the insertion piece is inserted into the inserted portion, the second flap may overlap the outer surfaces of the adjacent first flap and third flap in a portion excluding the insertion piece. .

According to the present invention, lifting of the lid due to folding can be suppressed.

FIG. 1 is a perspective view showing a packaging box according to a first embodiment of the present invention. FIG. 2 is a plan view showing a packaging box blank according to the first embodiment of the present invention. It is a top view which shows a part of 1st lower flap and 2nd lower flap of the packaging box based on 1st Embodiment of this invention. It is a perspective view explaining the process of assembling a packaging box concerning a 1st embodiment of the present invention. It is a top view showing the right part of the packaging box concerning a 1st embodiment of the present invention. 6 is a sectional view taken along line VI-VI in FIG. 5. FIG. 6 is a sectional view taken along line VII-VII in FIG. 5. FIG. It is a top view which shows the right part of the packaging box based on the modification of 1st Embodiment of this invention. FIG. 3 is a perspective view showing a packaging box according to a second embodiment of the present invention. It is a top view which shows the blank of the packaging box based on 2nd Embodiment of this invention. It is a perspective view explaining the process of assembling a packaging box concerning a 2nd embodiment of the present invention. It is a perspective view showing the packaging box concerning a 3rd embodiment of the present invention. It is a top view which shows the blank of the packaging box based on 3rd Embodiment of this invention.

Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that Fr, Rr, L, R, U, and D shown in the drawings indicate front, rear, left, right, top, and bottom. The front-back direction (first direction), the left-right direction (second direction), and the up-down direction are orthogonal to each other. Although terms indicating directions and positions are used in this specification, these terms are used for convenience of explanation and do not limit the technical scope of the present invention. Further, terms indicating directions and positions are based on directions and positions when the packaging box is assembled and used.

[First embodiment]
A packaging box 1 according to a first embodiment will be described with reference to FIGS. 1 to 4. FIG. 1 is a perspective view showing a packaging box 1. FIG. FIG. 2 is a plan view showing the blank 5 of the packaging box 1. FIG. 3 is a plan view showing a portion of the first lower flap 22D and the second lower flap 23D.

As shown in FIG. 1, the packaging box 1 includes a peripheral wall W formed into a substantially rectangular cylindrical shape, and lid parts 10U and 10D that are connected to both upper and lower ends of the peripheral wall W and close openings at both upper and lower ends of the peripheral wall W. It is equipped with. Although details will be described later, the lids 10U and 10D are held in a state in which the openings are closed without using adhesive tape, adhesive, or the like. The lid portion 10D includes a pair of first lower flaps 22D that are bent inside the peripheral wall W, and a pair of second lower flaps that are bent inside the peripheral wall W and overlapped on the outside of a part of the pair of first lower flaps 22D. 23D (see FIG. 2). Like the lid 10D, the lid 10U includes a pair of first upper flaps 22U and a pair of second upper flaps 23U.

The packaging box 1 is formed by assembling blanks 5 shown in FIG. The blank 5 is formed by punching out a single corrugated paper sheet using a cutting die or the like. The corrugated board sheet is, for example, a double-sided corrugated board sheet in which a front liner 9B and a back liner 9C (see FIG. 6, etc.) are bonded to a corrugated medium 9A. Note that FIGS. 2 and 3 show the front liner 9B side (outer surface of the packaging box 1). In this specification, a direction parallel to the corrugated cardboard sheet 9A will be referred to as a "corrugated direction", and a direction perpendicular to the corrugated direction will be referred to as a "flow direction". "X" shown in the drawings indicates the "stage direction" and "Y" indicates the "flow direction".

[blank]
As shown in FIG. 2, the blank 5 includes a pair of first side walls 20, a pair of second side walls 21, a pair of first lower flaps 22D, a pair of second lower flaps 23D, and a pair of first upper flaps. It includes a flap 22U and a pair of second upper flaps 23U. Note that since the paired portions have substantially the same shape, one portion will be described below unless otherwise specified.

<First side wall, second side wall>
The pair of first side walls 20 and the pair of second side walls 21 are alternately connected from one side toward the other in the flow direction via the first fold line L1. The first side wall 20 and the second side wall 21 are formed into a substantially rectangular shape. Specifically, the first side wall 20 is formed into a substantially rectangular shape that is longer in the flow direction than the second side wall 21. A passage piece 24 is connected to one end of the first side wall 20 in the flow direction via a first folding line L1.

<First lower flap, second lower flap>
The first lower flap 22D is connected to one end (lower end) of the first side wall 20 in the step direction via the second folding line L2. The first lower flap 22D is formed in a substantially rectangular shape, and its dimension in the step direction (extension dimension) is set to be slightly longer than half the dimension in the flow direction of the second side wall 21. On the tip side (free end side) of the first lower flap 22D, a stepped part 25 is formed by crushing the inner core 9A from the back liner 9C side to make it thinner (see the hatched area in FIG. 2). The second lower flap 23D is connected to one end (lower end) of the second side wall 21 in the step direction via the second folding line L2. The second lower flap 23D is formed in a generally rectangular shape, and its extension dimension is approximately the same as that of the first lower flap 22D.

<First lower flap, second lower flap>
The first upper flap 22U is connected to the other end (upper end) of the first side wall 20 in the step direction via the third folding line L3. The second upper flap 23U is connected to the other end (upper end) of the second side wall 21 in the step direction via the third folding line L3. The first upper flap 22U has substantially the same shape as the first lower flap 22D, and the second upper flap 23U has substantially the same shape as the second lower flap 23D.

Note that the first to third folding lines L1 to L3 are general-purpose ruled lines obtained by crushing the corrugated cardboard sheet in the thickness direction from the back liner 9C side. The general-purpose ruled line has the function of folding (normally folding) the corrugated cardboard sheet so that the back liner 9C faces inward. The first to third folding lines L1 to L3 are not limited to general-purpose ruled lines, but also include perforated lines with multiple cuts at predetermined intervals, lead ruled lines with perforated lines formed on general-purpose ruled lines, etc. for folding the corrugated cardboard sheet. Any structure may be used.

[Lock structure]
Both the upper and lower lid portions 10U, 10D are provided with locking structures 26U, 26D for keeping the opening of the peripheral wall W closed. Note that since the pair of upper and lower lock structures 26U and 26D have the same structure, the following description will focus on the lower lock structure 26D. Further, in this specification, for convenience of explanation, only arithmetic numerals are used in the explanations common to the pair of upper and lower lock structures 26U and 26D. In addition, in this specification, for convenience of explanation, the first upper flap 22U and the first lower flap 22D are simply referred to as "first flap 22" in the common explanation, and the second upper flap 23U and the second lower flap 23D, it will simply be referred to as the "second flap 23", and only arithmetic numerals will be attached to these symbols.

As shown in FIG. 2, the lock structure part 26 includes two pairs of inserted parts 30, two pairs of insertion pieces 35, a pair of pressing parts 36, a pair of insertion auxiliary fold lines 37, and a pair of insertion pieces 35. It has a correction piece 38. The two pairs of inserted portions 30 are formed on both sides of the pair of first flaps 22 in the flow direction. The two pairs of insertion pieces 35 and the pair of pressing parts 36 are formed on the tip side (free end side) of the pair of second flaps 23 in the step direction. The pair of insertion auxiliary fold lines 37 and the pair of correcting pieces 38 are formed at the intermediate part in the step direction of the pair of second flaps 23 (on the proximal end side of the insertion pieces 35). Note that the distal end side of each second flap 23 in the step direction from the insertion auxiliary fold line 37 is formed to be narrower in the flow direction than the proximal end side. For this reason, step portions are formed at both ends of the second flap 23 in the flow direction.

Note that the two inserted portions 30 formed on each of the first flaps 22 are formed symmetrically with respect to the line that bisects the first flap 22 in the flow direction. The description will be made focusing on one inserted portion 30 with reference to FIG. In addition, since the two pairs of insertion pieces 35, the pair of pressing parts 36, the pair of insertion auxiliary fold lines 37, and the pair of correction pieces 38 formed on the pair of second flaps 23 have the same shape, the following description will be made as shown in FIG. , a pair of insertion pieces 35, a pressing portion 36, an insertion auxiliary fold line 37, and a correction piece 38 formed on one second flap 23 will be described with reference to FIG.

<Plug-in part>
The inserted portion 30 is formed to penetrate the first flap 22 in the thickness direction. Specifically, the inserted portion 30 has a cut and raised structure in which the pushing piece 31 is bent along the pushing fold line 31A and cut along the pushing cutting line 32. The push-in fold line 31A (for example, a general-purpose ruled line) extends parallel to the column direction at the end side of the first flap 22 in the flow direction. The push-in cutting line 32 is formed in a chevron shape so as to connect both ends of the push-in fold line 31A. The pushing piece 31 is formed in a range surrounded by the pushing fold line 31A and the pushing cutting line 32.

The push cut line 32 has a straight cut portion 32A, an inclined cut portion 32B, and a bent cut portion 32C. The straight cutting portion 32A extends parallel to the flow direction from one end of the push-in fold line 31A, which is the base end side of the first flap 22, toward the center of the first flap 22 in the flow direction. The inclined cutting portion 32B is inclined from the other end of the push-in fold line 31A, which is the distal end side of the first flap 22, toward the center of the first flap 22 in the flow direction toward the proximal end side of the first flap 22. The bent cutting portion 32C connects the tips of the straight cutting portion 32A and the inclined cutting portion 32B, and is formed in a crank shape with the tip side of the first flap 22 protruding toward the center of the first flap 22 in the flow direction. . The pushing piece 31 is divided into a pushing fold line 31A and a pushing cutting line 32, and is formed in a substantially L shape (substantially rectangular shape).

Although the details will be described later, by pushing in the pushing piece 31 and cutting a part of the first flap 22 along the pushing cutting line 32, the insertion hole 33 having a shape complementary to the pushing piece 31 is formed in the first flap. It opens at 22. An inclined edge 33B is formed in the insertion hole 33 at a position where the insertion hole 33 is cut along the inclined cut portion 32B. Further, a single pressing portion 34 that projects inside the insertion hole 33 is formed on the base end side of the first flap 22 .

<Insert piece>
A pair of insertion pieces 35 are formed on both sides in the flow direction on the tip side of the second flap 23. The insertion piece 35 is formed into a substantially rectangular shape with chamfered corners on the tip side. The pair of insertion pieces 35 have a pair of protrusions 35A that protrude so as to approach each other. Although details will be described later, the pair of insertion pieces 35 are inserted into the above-mentioned insertion target portion 30 (insertion hole 33). When the insertion piece 35 is inserted into the insertion hole 33, the protrusion 35A intersects with the sloped edge 33B of the insertion hole 33 and interferes with the inside of the sloped edge 33B.

<Press part>
The pressing portion 36 is provided between the pair of insertion pieces 35 on the distal end side of the second flap 23 . The pressing portion 36 is formed into a substantially trapezoidal shape that gradually becomes narrower in the flow direction toward the distal end side. The dimension of the pressing portion 36 in the step direction (extension dimension) is set to be slightly shorter than the dimension of the insertion piece 35 in the step direction (extension dimension). A pair of cuts 36A are formed at the boundary between the pressing portion 36 and the pair of insertion pieces 35 along a pair of oblique sides of the trapezoid. Note that the base end of the cut 36A is curved into a substantially semicircular shape.

<Insert auxiliary fold line>
The insertion auxiliary fold line 37 is, for example, a general-purpose ruled line, and is formed parallel to the flow direction at the middle part of the second flap 23 in the step direction. The insertion auxiliary fold line 37 extends from a correction piece 38 (described later) to both ends of the second upper flap 23U in the flow direction. Although details will be described later, the insertion auxiliary fold line 37 causes the second flap 23 to be folded into a mountain when the insertion piece 35 is inserted into the inserted portion 30.

<Correction piece>
The correction piece 38 is divided into a cutting line 38A formed so as to protrude from the insertion auxiliary fold line 37 toward the distal end side of the second flap 23 at the intermediate portion of the insertion auxiliary fold line 37 in the flow direction. The correction piece 38 (cutting line 38A) is formed into a substantially trapezoidal shape that gradually becomes wider in the flow direction toward the distal end side of the second flap 23 (as it moves away from the insertion auxiliary fold line 37). The correction pieces 38 are formed on the base end side of the pressing portion 36 at intervals. Although the details will be described later, by pushing in the correction piece 38 and cutting a part of the second flap 23 along the cutting line 38A, a punch hole 39 having a shape complementary to the correction piece 38 is formed in the second flap 23. Open your mouth.

[Assembling the packaging box]
Next, the assembly process of the packaging box 1 will be explained with reference to FIGS. 1, 4 to 7. FIG. 4 is a perspective view illustrating the process of assembling the packaging box 1. FIG. 5 is a plan view showing the right side of the packaging box 1. FIG. 6 is a sectional view taken along line VI-VI in FIG. FIG. 7 is a sectional view taken along line VII-VII in FIG. Note that the packaging box 1 may be assembled manually by a worker, or automatically or semi-automatically using an automatic box making machine (not shown). Here, as an example, a case will be described in which a worker assembles the packaging box 1 manually. In addition, as an initial state before assembling the packaging box 1, the first side wall 20 and the second side wall 21 located on both outer sides in the flow direction of the blank 5 are bent along the first folding line L1, and the passage piece 24 is bent in the opposite direction. It is assumed that the packaging box 1 is double-folded (not shown).

The operator bends the pair of first side walls 20 and the pair of second side walls 21 at a substantially right angle along the first folding line L1. The pair of first side walls 20 face each other in the front-rear direction (first direction), the pair of second side walls 21 face each other in the left-right direction (second direction), and a peripheral wall W having openings at both upper and lower ends is formed ( (See Figures 1 and 4).

Subsequently, the operator closes the lower opening of the peripheral wall W with the lid 10D. In addition, although the lid part 10D (first lower flap 22D, second lower flap 23D) constitutes the bottom of the packaging box 1, it is assumed that it is oriented upward in consideration of workability during assembly.

As shown in FIG. 4, the operator folds the pair of first lower flaps 22D connected to the pair of first side walls 20 inward along the second folding line L2. The pair of first lower flaps 22D overlap at the stepped portion 25 on the tip side. Next, the worker folds the pair of second lower flaps 23D connected to the pair of second side walls 21 inward along the second folding line L2, and overlaps the left and right surfaces of the pair of first lower flaps 22D. . At this time, the operator fixes the pair of second lower flaps 23D to the pair of first lower flaps 22D using the locking structure 26D. Note that since the procedure for fixing the pair of second lower flaps 23D is the same, the following explanation will focus mainly on one second lower flap 23D.

The operator folds the second lower flap 23D into a mountain fold along the insertion auxiliary fold line 37, and inserts the tips of the pair of insertion pieces 35 into the pair of inserted parts 30 provided on the pair of first lower flaps 22D. Align with the push-in piece 31). The operator pushes the pair of pushing pieces 31 into the surrounding wall W from above the pair of insertion pieces 35 (see the right side of FIG. 4). The pair of push pieces 31 are cut out from the first lower flap 22D along the push cut line 32 while being bent at the push fold line 31A, and a pair of insertion holes 33 are opened at the places where the pair of push pieces 31 are hollowed out. do. Note that when the second lower flap 23D is mountain-folded along the insertion auxiliary fold line 37, the correction piece 38 is hollowed out along the cutting line 38A and protrudes outward.

The operator folds the pair of insertion pieces 35 while folding the second lower flap 23D along the second folding line L2 and returning the second lower flap 23D that has been mountain-folded along the insertion auxiliary folding line 37 to a flat state. into the insertion hole 33 (see left side of Figure 4). As shown in FIGS. 4 and 5, the pair of insertion pieces 35 slide onto the back sides of the pair of single pressing parts 34, and the pair of single pressing parts 34 overlap the surfaces of the pair of insertion pieces 35. Further, the pressing portion 36 overlaps the surface of the tip side (stepped portion 25) of the pair of first lower flaps 22D.

In this state, as shown in FIG. 6, the pair of first lower flaps 22D are held between the pair of insertion pieces 35 and the pressing part 36. Further, as shown in FIG. 7, the insertion piece 35 is held between the pushing piece 31 and the pressing piece 34. Furthermore, as shown in FIG. 5, the protrusion 35A of the insertion piece 35 intersects with the inclined edge 33B of the insertion hole 33 (more precisely, the extension line of the inclined edge 33B), and extends onto the back surface of the first lower flap 22D. overlapping. These structures prevent the insertion piece 35 from being easily pulled out from the insertion hole 33. Note that the sloped edge 33B intersecting the protrusion 35A does not necessarily mean that they always intersect when the insertion piece 35 is inserted into the insertion hole 33; This means that the protrusion 35A intersects with the inclined edge 33B during the process of inserting (the process of pulling out).

Next, as shown in FIG. 6, the operator bends the correction piece 38 at a boundary located on the same straight line as the insertion auxiliary fold line 37, and pushes it in the direction of pressing it against the first lower flap 22D (solid line arrow in FIG. reference). In the second lower flap 23D, a punch hole 39 is opened at a place where the correction piece 38 is hollowed out. Further, the pushed-in correction piece 38 is at a position lower than the surface of the second lower flap 23D (pressing part 36), and the correction piece 38 is moved by its own restoring force (elastic force in the opposite direction to the pushing direction). It contacts the edge of the punched hole 39 along the contour of the cutting line 38A with a frictional force (see the broken line arrow in FIG. 6). That is, the outer edge of the correction piece 38 comes into sliding contact with the inner edge of the punch hole 39. Since the straightening piece 38 is pushed in and frictional force acts on the edge of the punch hole 39, a straightening force is generated that presses the root portion of the straightening piece 38 (near the insertion auxiliary fold line 37) against the first lower flap 22D. (See the white arrow in Figure 6). Since the insertion auxiliary fold line 37 is pushed in relatively by this correction force, the folding tendency of the second lower flap 23D on the insertion auxiliary fold line 37 is corrected.

As described above, the lower opening of the peripheral wall W is closed by the lid portion 10D (first lower flap 22D, second lower flap 23D). In other words, the bottom of the packaging box 1 is formed. The operator stores a product (not shown) inside the peripheral wall W (places the product on the bottom).

The operator closes the top opening of the peripheral wall W with the lid 10U (first upper flap 22U, second upper flap 23U) in the same way as the lid 10D (see FIG. 1). Note that the procedure for closing the upper opening of the peripheral wall W with the lid 10U is the same as the procedure for closing the lower opening with the lid 10D, so a description thereof will be omitted.

Through the above steps, assembly of the packaging box 1 is completed (see FIG. 1). The packaging box 1 is sealed without using adhesive tape, adhesive, or the like. In addition, in order to open (or disassemble) the packaging box 1, the above assembly procedure may be reversed.

According to the packaging box 1 according to the first embodiment described above, the pushed-in correction piece 38 becomes caught on the edge of the punch hole 39 due to elastic force, and correction is performed to return the second flap 23 to a flat state. Since force is generated, the folding tendency of the second flap 23 at the insertion auxiliary fold line 37 can be corrected. Thereby, lifting of the second flap 23 due to folding can be suppressed. As a result, the insertion piece 35 is prevented from being pulled out due to vibrations or the like during transportation, and unintended opening can be prevented. Further, when stacking a plurality of packaging boxes 1, the raised second flaps 23 do not get in the way and can be stacked properly.

Further, since the inserted portion 30 (pushing piece 31) has a cut-and-raised structure, the insertion piece 35 can be sandwiched between the pressing piece 31 and the single pressing portion 34. Thereby, the insertion piece 35 can be prevented from coming off even more firmly. Furthermore, when inserting the insertion piece 35, the part that the tip of the insertion piece 35 comes into contact with is the pushing piece 31, so the tip of the insertion piece 35 does not come into direct contact with the product inside, causing damage to the product. can be kept to a minimum.

Further, according to the packaging box 1 according to the first embodiment, since the straightening piece 38 is formed to be wide in the insertion direction, the straightening piece 38 is prevented from being pulled out from the punch hole 39. Further, the pushed-in correction piece 38 becomes an obstacle, and the resistance force applied to the insertion piece 35 to be pulled out can be increased. Thereby, unintentional opening can be effectively prevented.

Moreover, according to the packaging box 1 according to the first embodiment, the insertion piece 35 is provided with the protrusion 35A, and the inclined edge 33B of the insertion hole 33 is connected to the protrusion 35A (inserted into the insertion hole 33). Since they are formed to intersect, even if a force in the pulling direction is applied to the insertion piece 35, the protrusion 35A interferes with the inclined edge 33B, thereby preventing the insertion piece 35 from coming off.

[Modified example]
In the packaging box 1 according to the first embodiment, the straightening piece 38 was in close contact with the edge of the punch hole 39 with almost no gap, so it was difficult to pull out the pushed straightening piece 38. Therefore, as a modification, as shown in FIG. 8, the second flap 23 may be formed with a release opening 27 for pulling out the pushed correction piece 38. The release opening 27 is formed at a position adjacent to the correction piece 38 of the second flap 23. The release opening 27 is a substantially semicircular cutout that is large enough to fit the operator's finger. According to this configuration, the operator can put his finger into the release opening 27 and pull out the pushed correction piece 38. Note that the release opening 27 may be formed in the correction piece 38, or may be formed in both the second flap 23 and the correction piece 38 (not shown). Furthermore, the shape of the release opening 27 is not limited to a semicircle, and may be freely changed.

In addition, in the packaging box 1 according to the first embodiment (including modified examples, the same applies hereinafter), two pairs of protrusions 35A are formed on the two pairs of insertion pieces 35, but the present invention is limited to this. Not done. It is sufficient that at least one pair of the two pairs of insertion pieces 35 is formed with a pair of protrusions 35A. In this case, the inclined edge 33B does not need to be formed in all the insertion holes 33, and it is sufficient if it is formed in the insertion hole 33 corresponding to the insertion piece 35 having the protrusion 35A. Further, the protrusion 35A of the insertion piece 35 and the inclined edge 33B of the insertion hole 33 may be omitted (not shown). Furthermore, although the insertion hole 33 is formed in a chevron shape, it may be formed in a rectangular shape, for example (not shown). Alternatively, the push-in piece 31 (the push-in fold line 31A) may be omitted, and the insertion hole 33 may be open from the beginning (not shown).

Further, in the packaging box 1 according to the first embodiment, the pair of first lower flaps 22D (the pair of first upper flaps 22U) overlap at the stepped portion 25 on the tip side, but the present invention has this configuration. Not limited. The pair of first lower flaps 22D (the pair of first upper flaps 22U) may be configured such that the stepped portion 25 is omitted and their tips abut each other, or the tips may be separated from each other (Fig. (not shown).

Further, in the packaging box 1 according to the first embodiment, the lid portions 10U and 10D were provided at both upper and lower ends of the peripheral wall W, but the present invention is not limited to this. For example, only the lower opening of the peripheral wall W may be closed by the lid portion 10D, and the upper opening of the peripheral wall W may be open. In other words, the lid portion only needs to be connected to at least one of both ends of the peripheral wall W in the axial direction.

[Second embodiment]
Next, a packaging box 2 according to a second embodiment will be described with reference to FIGS. 9 to 11. FIG. 9 is a perspective view showing the packaging box 2. FIG. 10 is a plan view showing the blank 6 of the packaging box 2. FIG. 11 is a perspective view illustrating the process of assembling the packaging box 2. In addition, in the following description, the same code|symbol is attached|subjected about the structure which is the same as or corresponds to the packaging box 1 based on 1st Embodiment, and the same or corresponding description is abbreviate|omitted.

As shown in FIGS. 9 and 10, the packaging box 2 according to the second embodiment includes a peripheral wall W and lids 11U and 11D that close openings at both upper and lower ends of the peripheral wall W. The lid portion 11D is a so-called one-touch bottom. The lid portion 11U has a first flap 43 and a second flap 44 that are connected to a pair of first side walls 20 facing each other in the front-rear direction (first direction) of the peripheral wall W.

[blank]
As shown in FIG. 10, the blank 6 of the packaging box 2 has a pair of first side walls 20, a pair of second side walls 21, a pair of first bottom walls 40, a pair of second bottom walls 41, and a pair of second side walls 21. It includes an inner flap 42, a first flap 43, and a second flap 44. Note that since the paired portions have substantially the same shape, one portion will be described below unless otherwise specified.

<First bottom wall>
The pair of first bottom walls 40 are connected to one end (lower end) of the first side wall 20 in the step direction via the second folding line L2. The first bottom wall 40 is formed in a generally rectangular shape, and its step direction dimension (extension dimension) is set to be slightly longer than half the flow direction dimension of the second side wall 21 . A substantially V-shaped engagement recess 40A is cut out on the tip side of the first bottom wall 40. A hook portion 40B is connected to one side of the engaging recess 40A via an engaging fold line 40C. On the other side of the first bottom wall 40 in the flow direction (on the second bottom wall 41 side), an inclined fold line 40E is formed obliquely from the engaging recess 40A toward the base end corner of the first bottom wall 40. A substantially triangular bottom adhesive portion 40D is defined in the corner region of the first bottom wall 40 by the inclined fold line 40E.

<Second bottom wall>
The pair of second bottom walls 41 are connected to one end (lower end) of the second side wall 21 in the step direction via the second folding line L2. The second bottom wall 41 is formed into a substantially trapezoidal shape that gradually becomes narrower from the base end toward the tip end. The dimension (extension dimension) of the second bottom wall 41 in the step direction is set to be slightly shorter than the extension dimension of the first bottom wall 40 .

Note that the interlocking fold line 40C is a general-purpose ruled line, and the inclined fold line 40E is a reverse ruled line crushed in the thickness direction from the front liner 9B side. The reverse ruled line has the function of folding (reverse folding) the corrugated cardboard sheet so that the front liner 9B faces inward. Note that the interlocking crease line 40C and the inclined crease line 40E are not limited to general-purpose ruled lines or reverse ruled lines, but may be any line for folding the corrugated cardboard sheet, such as a perforation blade line or a lead ruled line.

<Inner flap>
The pair of inner flaps 42 are connected to the other end (upper end) of the second side wall 21 in the step direction via the third folding line L3. The inner flap 42 is formed in a substantially rectangular shape, and its dimension in the step direction (extension dimension) is set to be slightly shorter than half of the dimension in the flow direction of the first side wall 20 .

<First flap, second flap>
The first flap 43 is connected to the other end (upper end) of one first side wall 20 in the step direction via the third folding line L3. The first flap 43 is formed in a substantially rectangular shape, and its dimension in the step direction (extension dimension) is approximately the same as the extension dimension of the inner flap 42 . The second flap 44 is connected to the other end (upper end) of the other first side wall 20 in the step direction via the third folding line L3. The second flap 44 is formed into a generally rectangular shape, and its maximum dimension (extension dimension) in the step direction is approximately the same as the extension dimension of the inner flap 42 . Stepped portions 45 are formed on both sides of the first flap 43 and the second flap 44 in the flow direction on the tip side (free end side) (see the hatched portion in FIG. 10).

[Lock structure]
The upper lid portion 11U (first flap 43, second flap 44) is provided with a lock structure portion 46 for keeping the top opening of the peripheral wall W in a closed state. The lock structure portion 46 includes an inserted portion 50, an insertion piece 51, an insertion auxiliary fold line 37, and three correction pieces 52.

<Plug-in part>
The inserted portion 50 is a slit-shaped hole formed on the tip side of the first flap 43 in the step direction. The inserted portion 50 opens at the intermediate portion of the first flap 43 in the flow direction (between the pair of stepped portions 45). To be precise, the inserted part 50 has an insertion hole 50A that is elongated in the flow direction, and a pair of insertion cuts 50B cut outward from both ends of the insertion hole 50A in the flow direction. . Note that the center portion of the insertion hole 50A in the flow direction is formed in a substantially fan shape (arc shape).

<Insert piece>
The insertion piece 51 is formed on the tip side (free end side) of the second flap 44 in the step direction. The insertion piece 51 is provided so as to protrude from the intermediate portion of the second flap 44 in the flow direction (between the pair of stepped portions 45) toward the distal end side. The insertion piece 51 is formed into a substantially rectangular shape with chamfered corners on the tip side. A pair of cuts 51A are cut into the base end of the insertion piece 51 in a direction in which they approach each other.

<Insert auxiliary fold line, correction piece>
The insertion auxiliary fold line 37 is formed parallel to the flow direction at the middle part of the second flap 44 in the step direction, except for the three correction pieces 52. The three correction pieces 52 are provided at approximately equal intervals at approximately the center and both sides of the insertion auxiliary fold line 37 in the flow direction. The center correction piece 52 in the flow direction is defined by a cutting line 52A that is formed to protrude from the insertion auxiliary fold line 37 toward the distal end side of the second flap 44. The two correction pieces 52 on both sides in the flow direction are defined by a cutting line 52A that is formed to protrude from the insertion auxiliary fold line 37 toward the base end side of the second flap 44. The three correction pieces 52 (cutting lines 52A) are each formed into a substantially rectangular shape. When the three correction pieces 52 are pushed in, three punch holes 53 open in the second flap 44 .

[Assembling the packaging box]
Next, the assembly process of the packaging box 2 will be explained with reference to FIGS. 9 and 11. Here, as an example, a case will be described in which a worker assembles the packaging box 2 manually. Note that the initial state of the packaging box 2 is double folded (not shown), similar to the initial state of the packaging box 1 according to the first embodiment. Further, the first bottom wall 40 and the second bottom wall 41 are folded inward along the third folding line L3, and the bottom adhesive part 40D of the first bottom wall 40 is reversely folded along the inclined folding line 40E, and the second bottom wall 41 is folded back inward along the third folding line L3. It is adhered to the front liner 9B of the bottom wall 41.

The worker forms the peripheral wall W by bending the pair of first side walls 20 and the pair of second side walls 21 at a substantially right angle. In conjunction with the formation of the peripheral wall W, the folded first bottom wall 40 and second bottom wall 41 are pushed out until they become substantially parallel to each other while flattening the reversely folded bottom adhesive part 40D (see FIG. (not shown). The hook portions 40B of the pair of first bottom walls 40 enter the opposing meshing recesses 40A while being bent along the meshing crease line 40C, and are meshed with each other (not shown).

As described above, the lower opening of the peripheral wall W is closed by the lid portion 11D (first bottom wall 40, second bottom wall 41). The worker stores the product inside the peripheral wall W (places the product on the bottom).

Next, as shown in FIG. 11, the operator closes the upper opening of the peripheral wall W with the lid 11U (first flap 43, second flap 44). Specifically, the worker folds the pair of inner flaps 42 inward at the third folding line L3, then folds the first flap 43 inward at the third folding line L3, and then bends the first flap 43 inward at the third folding line L3. Overlap.

Next, the operator fixes the second flap 44 to the first flap 43 using the locking structure 46. Specifically, the operator folds the second flap 44 into a mountain along the insertion auxiliary fold line 37, and aligns the tip of the insertion piece 51 with the inserted portion 50 opened in the first flap 43. The operator inserts the insertion piece 51 into the inserted portion 50 while bending the second flap 44 along the third folding line L3 and returning the second flap 44 that has been mountain-folded along the insertion auxiliary folding line 37 to a flat state. Insert it into the The insertion piece 51 slides onto the back side of the first flap 43, and the pair of stepped portions 45 of the second flap 44 overlap the surface of the stepped portion 45 of the first flap 43. The insertion piece 51 is held between the pair of insertion cuts 50B of the inserted portion 50, and cannot be easily pulled out from the insertion hole 50A.

Next, as shown in FIG. 9, the operator pushes the three correction pieces 52 inside to open the three punch holes 53. The pushed-in correction piece 52 contacts the edge of the hole 53 with frictional force due to its own restoring force. When each correction piece 52 is pushed in, a frictional force acts on the edge of the punch hole 53, thereby generating a correction force that presses the root portion of each correction piece 52 against the first flap 43. The insertion auxiliary fold line 37 is pushed in by this straightening force, and the folding tendency of the second flap 44 on the insertion auxiliary fold line 37 is corrected.

Through the above steps, the upper opening of the peripheral wall W is closed, and the assembly of the packaging box 2 is completed. The packaging box 2 is sealed without using adhesive tape, adhesive, or the like. In addition, when the packaging box 2 is used for mail-order sales, it is preferable that a transportation slip be attached so as to span the first flap 43 and the second flap 44. Moreover, in order to open (or disassemble) the packaging box 2, the above-described assembly procedure may be reversed.

According to the packaging box 2 according to the second embodiment described above, it is possible to obtain the same effects as the packaging box 1 according to the first embodiment, such as being able to suppress the lifting of the second flap 44 due to folding. can.

Note that in the packaging box 2 according to the second embodiment, the stepped portions 45 are formed in the first flap 43 and the second flap 44, but the stepped portions 45 may be omitted.

[Third embodiment]
Next, a packaging box 3 according to a third embodiment will be described with reference to FIGS. 12 and 13. FIG. 12 is a perspective view showing the packaging box 3. FIG. 13 is a plan view showing the blank 7 of the packaging box 3. In addition, in the following description, the same code|symbol is attached|subjected about the structure which is the same as or corresponds to the packaging box 1 based on 1st Embodiment, and the same or corresponding description is abbreviate|omitted.

As shown in FIGS. 12 and 13, the packaging box 3 according to the third embodiment is a substantially A-type box that is sealed by closing the openings at both upper and lower ends of the peripheral wall W with lids 12U and 12D. The lid portion 12D includes a pair of lower inner flaps 60 that are connected to a pair of second side walls 21 that face each other in the left-right direction of the peripheral wall W, and a pair of first side walls 20 that face each other in the front-rear direction of the peripheral wall W. A pair of lower outer flaps 61 are provided. The lid portion 12U has a first flap 62 and a third flap 64 that are connected to a pair of first side walls 20 facing each other in the front-rear direction (first direction) of the peripheral wall W. Further, the lid portion 12U includes a second flap 63 and a fourth flap 65 that are connected to a pair of second side walls 21 that face each other in the left-right direction (second direction) of the peripheral wall W.

[blank]
As shown in FIG. 13, the blank 7 of the packaging box 3 includes a pair of first side walls 20, a pair of second side walls 21, a pair of lower inner flaps 60, a pair of lower outer flaps 61, and first to Fourth flaps 62 to 65 are provided. Note that since the paired portions have substantially the same shape, one portion will be described below unless otherwise specified.

<Lower inner flap, lower outer flap>
The pair of lower inner flaps 60 are connected to one end (lower end) of the first side wall 20 in the step direction via the second folding line L2. The pair of lower outer flaps 61 are connected to one end of the second side wall 21 in the step direction via the second folding line L2. The lower inner flap 60 and the lower outer flap 61 are formed in a substantially rectangular shape, and their dimension in the step direction (extension dimension) is set to be approximately half the dimension of the second side wall 21 in the flow direction.

<1st to 4th flap>
The first flap 62 and the third flap 64 are connected to the other end (upper end) of the first side wall 20 in the step direction via the third folding line L3. The second flap 63 and the fourth flap 65 are connected to the other end (upper end) of the second side wall 21 in the step direction via the third folding line L3. The first to fourth flaps 62 to 65 are formed into a substantially rectangular shape, and their dimension in the step direction (extension dimension) is approximately the same as the extension dimension of the lower inner flap 60 and the like.

[Lock structure]
The upper lid portion 12U (first to fourth flaps 62 to 65) is provided with a lock structure portion 66 for keeping the top opening of the peripheral wall W in a closed state. The lock structure portion 66 includes an inserted portion 70, an insertion piece 71, an insertion auxiliary fold line 37, and a correction piece 38.

<Plug-in part>
The inserted portion 70 is a notch extending from the tip of the first flap 62 in the step direction toward the base end. The inserted portion 70 is cut out in a substantially triangular shape on the side of the second flap 63 adjacent to the first flap 62 . A substantially semicircular pointing hole 70A is cut out in the vicinity of the inserted portion 70 of the first flap 62.

<Insert piece>
The insertion piece 71 is formed at the tip of the second flap 63 in the step direction. Specifically, a slit 72 is cut into the second flap 63 from the distal end toward the proximal end, and the pressing portion 73 is provided closer to the first flap 62 than the slit 72 . The insertion piece 71 is provided on the opposite side of the pressing part 73 with the slit 72 in between. The insertion piece 71 is constituted by a part of the second flap 63 adjacent to the slit 72.

<Insert auxiliary fold line, correction piece>
The insertion auxiliary fold line 37 is formed parallel to the flow direction at the middle part of the second flap 63 in the step direction, except for the correction piece 38. The correction piece 38 is formed so as to protrude from the insertion auxiliary fold line 37 toward the distal end side of the second flap 63 at approximately the center of the insertion auxiliary fold line 37 in the flow direction.

[Assembling the packaging box]
Next, with reference to FIG. 12, the assembly process of the packaging box 3 will be explained. Here, as an example, a case will be described in which a worker assembles the packaging box 3 manually. Note that the initial state of the packaging box 3 is double folded (not shown), similar to the initial state of the packaging box 1 according to the first embodiment.

The worker forms the peripheral wall W by bending the pair of first side walls 20 and the pair of second side walls 21 at a substantially right angle. Subsequently, although not shown, the operator folds the pair of lower inner flaps 60 inward along the second folding line L2, and then folds the pair of lower outer flaps 61 inward along the second folding line L2. The pair of lower outer flaps 61 are stacked on the surfaces of the pair of lower inner flaps 60, and the tips of the pair of lower outer flaps 61 are butted against each other. The operator applies adhesive tape (not shown) along the abutting portions of the pair of lower outer flaps 61. Note that the pair of lower outer flaps 61 may be adhered to the pair of lower inner flaps 60 using an adhesive instead of the adhesive tape.

As described above, the lower opening of the peripheral wall W is closed by the lid 12D (lower inner flap 60, lower outer flap 61) to form the bottom of the packaging box 3 (not shown). The worker stores the product inside the peripheral wall W (places the product on the bottom).

Next, the operator closes the upper opening of the peripheral wall W with the lid portion 12U (first to fourth flaps 62 to 65). Specifically, the worker folds the first flap 62, the fourth flap 65, the third flap 64, and the second flap 63 inward of the peripheral wall W in this order, and uses the locking structure 66 to fold the second flap. 63 is fixed to the first flap 62.

Specifically, the operator folds the second flap 63 along the insertion auxiliary fold line 37, and aligns the tip of the insertion piece 71 with the inserted portion 70 cut out in the first flap 62. The operator places a finger into the pointing hole 70A to lift a part of the first flap 62, and while folding the second flap 63 along the second folding line L2, folds the second flap 63, which has been mountain-folded along the insertion auxiliary folding line 37. 2. While returning the flap 63 to a flat state, insert the insertion piece 71 into the inserted portion 70. The insertion piece 71 slides onto the back side of the first flap 62, and the portion of the second flap 63 excluding the insertion piece 71 overlaps the surfaces (outer surfaces) of the adjacent first flap 62 and third flap 64. Since the insertion piece 71 and the pressing part 73 sandwich the first flap 62, the insertion piece 71 cannot be easily pulled out from the inserted part 70.

Next, when the operator pushes in the correction piece 38, the folding tendency of the second flap 63 at the insertion auxiliary fold line 37 is corrected.

Through the above steps, the upper opening of the peripheral wall W is closed, and the assembly of the packaging box 3 is completed. In addition, in order to open (or disassemble) the packaging box 3, the above-described assembly procedure may be reversed.

According to the packaging box 3 according to the third embodiment described above, it is possible to obtain the same effects as the packaging box 1 according to the first embodiment, such as being able to suppress the lifting of the second flap 63 due to folding. can.

In addition, in the packaging box 1 according to the first embodiment, the locking structures 26U and 26D are provided on both upper and lower sides of the peripheral wall W, and in the packaging boxes 2 and 3 according to the second and third embodiments, the locking structure is provided only on the upper side of the peripheral wall W. Although structures 46 and 66 were provided, the invention is not limited thereto. The lock structure portion may be provided on at least one of the upper and lower sides of the peripheral wall W.

Furthermore, in the packaging boxes 1 and 3 according to the first and third embodiments, one correction piece 38 is provided to protrude from the insertion auxiliary fold line 37 only toward the tip side of the second flaps 23 and 63, and the second embodiment In the packaging box 2 according to the present invention, three correction pieces 52 were provided protruding from the insertion auxiliary fold line 37 toward both the distal end side and the proximal end side of the second flap 44, but the present invention is not limited thereto. It is sufficient that the correction piece protrudes from the insertion auxiliary fold line 37 toward at least one of the distal end side and the proximal end side of the second flaps 23, 44, and 63.

Further, in the packaging boxes 1 to 3 according to the first to third embodiments, the correction pieces 38 and 52 are formed into a substantially trapezoidal shape or a substantially rectangular shape, but the present invention is not limited to this. For example, the shape of the correction pieces 38 and 52 may be any shape, such as a triangle, a polygon other than a quadrangle, a semicircle, or a combination thereof (not shown). Further, the cutting lines 38A and 52A that partition the correction pieces 38 and 52 may be cut with a straight knife, or they may be cut into a wavy shape, for example, in order to increase the frictional force with the correction pieces 38 and 52. It may also be cut (not shown).

In addition, in the packaging boxes 1 to 3 according to the first to third embodiments, the insertion auxiliary fold line 37 is a general-purpose ruled line, but it is not limited to this, and can be used for folding a corrugated cardboard sheet, such as a sewing machine blade line or a lead ruled line. Any line may be used as long as it is a line (not shown). Further, although the insertion auxiliary fold line 37 is formed substantially parallel to the second and third fold lines L2 and L3, the present invention is not limited to this, and the insertion auxiliary fold line 37 is formed at an angle to the second and third fold lines L2 and L3. (not shown).

Further, although the packaging boxes 1 to 3 according to the first to third embodiments are formed of paper double-sided corrugated sheets, the present invention is not limited thereto. The packaging boxes 1 and 2 may be made of single-sided corrugated cardboard, double-sided corrugated cardboard, double-sided corrugated cardboard, etc., or may be made of cardboard, a resin board (sheet), or the like.

Note that the description of the above embodiment shows one aspect of the packaging box according to the present invention, and the technical scope of the present invention is not limited to the above embodiment. The technical scope of the present invention is not limited to the above embodiments. The present invention may be variously changed, replaced, and modified without departing from the spirit of the technical idea, and the scope of the claims includes all embodiments that can be included within the scope of the technical idea.

1, 2, 3 Packaging box W Peripheral wall 10U, 10D, 11U, 12U Lid portion 20 First side wall 21 Second side wall 22D First lower flap (first flap)
22U 1st upper flap (1st flap)
23D Second lower flap (second flap)
23U 2nd upper flap (2nd flap)
27 Release opening 30, 50, 70 Part to be inserted 33 Insertion hole 33B Slanted edge 35, 51, 71 Insertion piece 35A Projection 37 Insertion auxiliary fold line 38, 52 Correction piece 38A, 52A Cutting line 39, 53 Cutting Hole 43, 62 First flap 44, 63 Second flap 64 Third flap 65 Fourth flap 72 Slit

Claims (6)

a peripheral wall (W) formed in a cylindrical shape;
a lid part (10U, 10D, 11U, 12U) that is connected to at least one end of both axial ends of the peripheral wall and closes an opening of the peripheral wall,
The lid portion is
a first flap (22D, 22U, 43, 62) that is bent inside the peripheral wall;
a second flap (23D, 23U, 44, 63) that is bent inside the peripheral wall and overlapped on the outside of a part of the first flap;
The first flap has an inserted portion (30, 50, 70) formed to penetrate in the thickness direction,
The second flap is
an insertion piece (35, 51, 71) formed on the tip side and inserted into the inserted part;
an auxiliary insertion folding line (37) formed on the proximal end side of the insertion piece and causing the second flap to be mountain-folded when the insertion piece is inserted into the inserted portion;
a correction piece (38, 52) defined by a cutting line (38A, 52A) formed to protrude from the insertion auxiliary fold line toward at least one of the distal end side and the proximal end side;
With the insertion piece inserted into the inserted part, the correction piece is pushed in, and its own restoring force applies a frictional force to the edge of the punch hole (39, 53) along the contour of the cutting line. The packaging box is characterized in that the second flap is brought into contact with the auxiliary fold line of the second flap to generate a straightening force for straightening the folding tendency of the second flap at the insertion auxiliary fold line. The packaging box according to claim 1, wherein the correction piece (38) has a shape that becomes wider as it moves away from the insertion auxiliary fold line. 3. A release opening (27) for pulling out the pressed correction piece is formed in at least one of the second flap and the correction piece. packaging box. A pair of the first flaps (22D, 22U) are provided on a pair of first side walls (20) facing in a first direction of the peripheral wall,
A pair of the second flaps (23D, 23U) are provided to a pair of second side walls (21) facing in a second direction intersecting the first direction of the peripheral wall, and the second flaps (23D, 23U) overlapped on both sides of the direction,
The inserted part (30) includes two pairs of insertion holes (33) that are open on both sides of the pair of first flaps in the second direction,
Two pairs of the insertion pieces (35) are formed on the pair of second flaps,
At least one pair of the two pairs of insert pieces has a pair of protrusions (35A) that protrude so as to approach each other,
Any one of claims 1 to 3, wherein the insertion hole corresponding to the insertion piece having the protrusion has an inclined edge (33B) inclined so as to intersect with the protrusion. The packaging box described in. The first flap (43) and the second flap (44) are provided on a pair of first side walls (20) facing each other in a first direction of the peripheral wall. The packaging box described in any one of the items above. a third flap (64) connected to one end of a pair of first side walls (20) facing in the first direction of the peripheral wall and bent inward of the peripheral wall;
a fourth flap (65) that is connected to one end of a pair of second side walls (21) facing in a second direction intersecting the first direction of the peripheral wall and is bent inward of the peripheral wall; further comprising;
The first flap (62) is connected to the other end of the pair of first side walls,
The second flap (63) is connected to the other end of the pair of second side walls,
The second flap has a slit (72) cut from the distal end toward the proximal end to form the insertion piece,
The first flap, the fourth flap, the third flap, and the second flap are bent inward of the peripheral wall in this order, and with the insertion piece inserted into the inserted part, 4. The packaging box according to claim 1, wherein the flap overlaps the outer surfaces of the adjacent first flap and third flap in a portion excluding the insertion piece.

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