JP3234703U - Packaging box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple packaging box which is suitable for packaging a rectangular parallelepiped-shaped container such as a PTP sheet and has a function of buffering protection of the container in the box so as not to shake significantly in the front-rear direction. ..
A cylinder and a lid for closing one end of the cylinder are provided. The lid portion includes an outer lid piece 44 (1), an inner lid piece 64 (1), and side flaps 40 (1) and 60 (1), and is further extended to the end edge of the outer lid piece 44 (1). Auxiliary piece 48 (1) and a first flexible tongue piece 52 (1) extending to the center of the end edge of the auxiliary piece 48 (1) are provided. In the assembled state before opening, the auxiliary piece 48 (1) is folded at the second folding ruled line 50 (1), one side is overlapped with the inner surface of the outer lid piece 44 (1) and glued, and the other side is glued. It overlaps with the outer surface of the inner lid piece 64 (1) and is glued. The end of the first flexible tongue piece 52 (1) in the extending direction is locked to the inner surface of the second side plate 20, and the third fold ruled line 54 (1) is broken and bent inward. It is diagonally arranged inside the opening portion 56 (1).
[Selection diagram] Fig. 2

Description

The present invention relates to a packaging box having a function of buffering the contents, and more particularly to a packaging box suitable for packaging a rectangular parallelepiped-shaped contents.

Conventionally, as disclosed in Patent Document 1 by the applicant of the present application, there has been a packaging box having a structure for holding a rectangular parallelepiped-shaped container in a box as a buffer so as not to shake significantly. This packaging box has a second lid that closes the bottom end of the cylinder, and a flexible plate is extended to the tip of the side flap that constitutes the second lid, and in the assembled state. A flexible plate is diagonally arranged at the corner where the side flap and the side plate on which the side flap is extended intersect, and the flexible plate supports the lower corner of the container as a buffer. It has a structure.

Utility Model Registration No. 3222860

A typical rectangular parallelepiped-shaped container is one in which PTP sheets containing medicinal tablets or the like are stacked and bundled. Since the embossed storage portion for storing tablets is weak in the PTP sheet, it is required to prevent a strong external force or impact from being applied to the storage portion during transportation.

When the PTP sheet is put into the packaging box, it is often stored by arranging the thickness direction of the PTP sheet (the direction in which the storage portion containing tablets or the like protrudes) in the front-rear direction of the packaging box. Therefore, when the packaging box is provided with the cushioning mechanism, it is desirable that the PTP sheet has a structure that does not easily shake in the front-rear direction so that the accommodating portion of the PTP sheet does not strongly hit the front and rear side plates.

However, the cushioning mechanism of the packaging box of Patent Document 1 makes it difficult for the contents to shake in the left-right direction, and does not make it difficult to shake in the front-back direction. Therefore, if the inclusion is a PTP sheet, the buffering effect may be inadequate.

The present invention has been made in view of the above background technology, is suitable for packaging a rectangular parallelepiped-shaped container such as a PTP sheet, and is a buffer so that the container in the box does not shake significantly in the front-rear direction. The purpose is to provide a simple packaging box with a protective function.

The present invention has first to fourth side plates that are sequentially continuous in the circumferential direction, the first and third side plates face each other in the left-right direction, and the second and fourth side plates face each other in the front-rear direction. A rectangular cylinder facing the surface, an outer lid piece extending to the end of the second side plate via a first folding line, and an inner lid extending to the end of the fourth side plate. A lid piece, a pair of side flaps extending from each end of the first and third side plates, and an opening provided at the end of the second side plate having the first fold line. The outer lid piece and the opening break line for separating the opening part from the second side plate at the time of opening are provided, and the side flap, the inner lid piece and the inner lid piece are provided in an assembled state before opening. A seal-end type packaging box in which outer lid pieces are stacked in order from the inside, and the outer lid piece and the inner lid piece are joined to form a lid portion.
The lid portion includes an auxiliary piece extending from the outer lid piece in the extending direction via a second folding ruled line parallel to the first folding ruled line, and an auxiliary piece extending in the extending direction. A first flexible tongue piece extending through a third fold ruled line parallel to the second fold ruled line is provided at the center of the side, and the first flexible tongue piece has a base. A pair of engaging portions projecting in opposite directions are provided by notching both sides of the end portions inward, and the two side flaps have a side surface or a tip angle close to the outer lid piece. By notching the portion, an engaging receiving portion with which the engaging portion of the first flexible tongue piece can be engaged is provided.
In the assembled state before opening, the auxiliary piece is folded at the second folding ruled line, one side overlaps the inner surface of the outer lid piece and is glued, and the other side overlaps the outer surface of the inner lid piece. The first flexible tongue piece is glued so that the end edge in the extending direction is locked to the inner surface of the second side plate, and the third folding ruled line is broken and bent inward. Arranged diagonally inside the opening
After the opening break line is cut off and opened, the side flap, the inner lid piece, and the outer lid piece are sequentially overlapped in a resealed state, and the engagement of the first flexible tongue piece. A packaging box in which the lid portion is held in a closed state by engaging the joint portion with the engagement receiving portion of the side flap.

Inside the auxiliary piece, a convex region formed in a convex embossed shape on the outer surface side is provided, and in the assembled state before opening, the auxiliary piece is said by the glue in the recess on the inner surface side of the convex region. It is preferable that the inner lid piece is glued to the outer surface. Further, the lids may be provided in pairs at both ends of the cylinder.

Further, it is preferably formed by assembling one box body forming piece. In this case, in the box body forming piece, the first to fourth side plates are connected in a row with the second or fourth side plates arranged at the ends, and the second or fourth side plates are located at the ends. A gluing plate is extended to the end side of the four side plates in the connecting direction, and a second flexible tongue piece is placed on the end side of the gluing plate close to the member constituting the lid portion. In the assembled state before opening, the glue plate is glued to the inner surface of the first or third side plate located at the opposite end to form the cylinder, and the second The flexible tongue piece is diagonally arranged inside the side flap with its extending end locked to the inner surface of the side flap and the fourth fold ruled line bent inward. It is preferable to have a structure like this.

The packaging box of the present invention has a simple structure and is very easy to assemble. Since the lid is provided with a unique first flexible tongue piece, the contents inside the box can be protected as a buffer so as not to shake significantly in the front-rear direction. It also has a resealing function, and after opening the lid, the lid is closed by engaging the engaging part of the first flexible tongue piece with the engaging receiving part of the side flap. Can be held by. Furthermore, by attaching a second flexible tongue piece to the gluing plate for forming the tubular body, the contents in the box body are protected in a buffering manner so as not to shake significantly in the left-right direction. Can be done.

It is a perspective view (a) which shows the assembled state of one Embodiment of the packaging box of this invention, and is the perspective view (b) which shows the structure of the lid part excluding the outer lid piece. It is a top view which looked at the box body forming piece which developed the packaging box of this embodiment from the back surface side. It is a plan view (a), (b) which shows the assembly process (the process of folding a box body forming piece) of the packaging box of this embodiment in order. It is a plan view (a), (b) which shows the assembly process (the process of folding a box body forming piece) of the packaging box of this embodiment in order. A vertical cross-sectional view (a) of the internal structure of the packaging box assembling step of this embodiment in a state where the lower lid portion is formed as viewed from the side of the second side plate, and viewed from the side of the first side plate. It is a vertical sectional view (b). It is a vertical cross-sectional view (a) which looked at the internal structure of the assembled state of the packaging box of this embodiment from the side of the 2nd side plate, and is a vertical cross-sectional view (b) which looked at from the side of the 1st side plate. It is a perspective view (a) which shows the state which opened the lid part of the packaging box of this embodiment, and is the perspective view (b) which shows the state which it resealed.

Hereinafter, an embodiment of the packaging box of the present invention will be described with reference to the drawings. The packaging box 10 of this embodiment is a box body for packaging the container S in which PTP sheets are bundled, and has a rectangular cylinder body 12 as shown in FIG. 1A, and has an upper end of the cylinder body 12. The portion is closed by the lid portion 14 (1) and the lower end is closed by the lid portion 14 (2). The lid portions 14 (1) and 14 (2) have a substantially plane-symmetrical structure with the tubular body 12 interposed therebetween.

The packaging box 10 is formed by assembling a single box body forming piece 16 made of thick paper or the like having a certain degree of flexibility. As shown in FIG. 2, the box body forming piece 16 has first to fourth side plates 18, 20, 22, and 24 which are sequentially connected in a row. The four side plates 20, 22, 24, 26 have the same length in the width direction in which they are connected, and the lengths in the connecting direction are almost equal to each other because the first and third side plates 18, 22 are short. , Second and fourth side plates 20, 24 are long and approximately equal to each other. The first to fourth side plates 18, 20, 22, and 24 are separated by fold ruled lines 26, 28, and 30 parallel to each other.

A gluing plate 32 is extended at the end edge of the fourth side plate 24 in the connecting direction, and is separated from the fourth side plate 24 by a fold ruled line 34. The gluing plate 32 is a portion that is glued to the end portion of the first side plate 18 at the time of assembly in order to form the tubular body 12. Further, the second flexible tongue pieces 36 (1) and 36 (2) are extended on both sides perpendicular to the extending direction of the gluing plate 32, respectively, and the fourth fold ruled lines 38 (1) and 38 ( It is separated from the gluing plate 32 by 2).

Members for forming one of the lids 14 (1) are extended on the upper end sides of the first to fourth side plates 18, 20, 22, and 24 in FIG. Members for forming the lid portion 14 (2) on the opposite side are extended from each end side. Hereinafter, these will be described in order.

A trapezoidal side flap 40 (1) extends from the upper end of the first side plate 18, and is separated from the first side plate 18 by a fold ruled line 42 (1). The length of the side flap 40 (1) in the extending direction is slightly shorter than half of the length of the second and fourth side plates 20 and 24 in the connecting direction. The engagement receiving portion 40a (1) is provided by cutting out the tip corner portion of the side flap 40 (1) closer to the second side surface plate 20 in a substantially V shape.

On the lower end and the end of the first side plate 18, the side flap 40 (2) similar to the side flap 40 (1), the engaging receiving portion 40a (1) and the fold ruled line 42 (1) , The engaging receiving portion 40a (2) and the folding ruled line 42 (2) are provided.

A substantially quadrangular outer lid piece 44 (1) extends from the upper end edge of the second side plate 20, and is separated from the second side plate 20 by a first folding ruled line 46 (1). The length of the outer lid piece 44 (1) in the extending direction is substantially the same as the length of the first and third side plates 18 and 22 in the connecting direction. Further, a quadrangular auxiliary piece 48 (1) is extended at the end of the outer lid piece 44 (1) in the extending direction, and the second fold ruled line 50 (1) substantially parallel to the first fold ruled line 46 (1) is provided. It is separated from the outer lid piece 44 (1) by 1). The length of the auxiliary piece 48 (1) in the extending direction is about 2/3 of the length of the first and third side plates 18 and 22 in the connecting direction. Then, as shown in the vertical cross-sectional view added to the upper right of FIG. 2, a convex region 48a (1) formed in a convex embossed shape on the back surface side of the base material is formed in the substantially central portion of the auxiliary piece 48 (1). It is provided.

Further, the first flexible tongue piece 52 (1) is extended at the center of the end side of the auxiliary piece 48 (1) in the extending direction, and is substantially parallel to the second fold ruled line 46 (1). It is separated from the auxiliary piece 48 (1) by a three-fold ruled line 54 (1). The length of the first flexible tongue piece 52 (1) in the extending direction is about 2/3 of the length of the first and third side plates 18 and 22 in the connecting direction. The first flexible tongue piece 52 (1) is provided with a pair of engaging portions 52a (1) protruding in opposite directions by cutting out both end portions of the base end portions inward. There is. The tip of the engaging portion 52a (1) is chamfered with a round tip.

Further, at the upper end of the second side plate 20, an opening portion 56 (1) having a size that can be pressed by a finger, and an outer lid piece 44 (1) and an opening portion 56 (1) at the time of opening are secondly attached. A break line 58 (1) for opening is provided to separate the side plate 20 from the side plate 20.

On the lower end and the end of the second side plate 20, the outer lid piece 44 (1), the first fold ruled line 46 (1), the auxiliary piece 48 (1), the convex region 48a (1), and the first Double fold ruled line 50 (1), first flexible tongue piece 52 (1), engaging portion 52a (1), third fold ruled line 54 (1), opening portion 56 (1) and opening break line 58 Similar to (1), outer lid piece 44 (2), first fold ruled line 46 (2), auxiliary piece 48 (2), convex area 48a (2), second fold ruled line 50 (2), first A flexible tongue piece 52 (2), an engaging portion 52a (2), a third fold ruled line 54 (2), an opening portion 56 (2), and an opening breaking line 58 (2) are provided.

A trapezoidal side flap 60 (1) extends from the upper end edge of the third side plate 22, and is separated from the third side plate 22 by a fold ruled line 62 (1). The length of the side flap 60 (1) in the extending direction is slightly shorter than half of the length of the second and fourth side plates 20 and 24 in the connecting direction. Then, the tip corner portion of the side flap 60 (1) closer to the second side surface plate 20 is cut out in a V shape, and the engaging receiving portion 60a (1) is provided.

On the lower end and the end of the third side plate 22, the side flap 60 (2) similar to the side flap 60 (1), the engaging receiving portion 60a (1) and the fold ruled line 62 (1) , The engaging receiving portion 60a (2) and the folding ruled line 62 (2) are provided.

A quadrangular inner lid piece 64 (1) extends from the upper end edge of the fourth side plate 24, and is separated from the fourth side plate 24 by a fold ruled line 66 (1). The length of the inner lid piece 64 (1) in the extending direction is about 2/3 of the length of the first and third side plates 18 and 22 in the connecting direction. Then, on the lower end edge and the end portion of the fourth side plate 24, the inner lid piece 64 (2) and the fold ruled line 66 (similar to the inner lid piece 64 (1) and the fold ruled line 66 (1)) 2) is provided.

The tip of the second flexible tongue piece 36 (1) extending to the upper edge of the gluing plate 32 protrudes upward beyond the fold ruled line 66 (1) and is below the gluing plate 32. The tip of the second flexible tongue piece 36 (2) extending to the side edge also protrudes downward beyond the fold ruled line 66 (2).

Next, an example of how to assemble the packaging box 10 will be described. Here, regarding the folding method of each folding ruled line of the box body forming piece 16 shown in FIG. 2, the folding method in which the front surface is convex is referred to as normal folding, and the folding method in which the back surface is convex is referred to as reverse folding.

First, as shown in FIG. 3A, glue 68 (1) is formed on the back surface side of the convex region 48a (1) of the auxiliary piece 48 (1) and the back surface side of the convex region 48a (2) of the auxiliary piece 48 (2). ) And 68 (2) are applied respectively. Then, as shown in FIG. 3B, the auxiliary piece 48 (1) is folded forward along the second folding ruled line 50 (1) and overlapped with the back surface of the outer lid piece 44 (1), and the auxiliary piece 48 (1) is placed on the back surface. ) Is glued to the outer lid piece 44 (1). Further, the auxiliary piece 48 (2) is folded forward along the second fold ruled line 50 (2) and overlapped with the back surface of the outer lid piece 44 (2), and the auxiliary piece 48 (2) is placed on the outer lid piece 44 (2). Glue.

After that, as shown in FIG. 4A, the fourth side plate 24 is normally folded along the fold ruled line 30, and the fourth side plate 24 and the gluing plate 32 are formed on the second and third side plates 20 and 22. The glue 70 is applied to the front surface of the gluing plate 32 so as to be overlapped on the back surface. Then, as shown in FIG. 4B, the first side plate 18 is folded forward along the fold ruled line 26 and overlapped with the gluing plate 32, and the first side plate 18 is glued to the gluing plate 32. The box body forming piece 16 is shipped from the manufacturing factory of the packaging box 10 or the like in this folded state.

Next, in a factory or the like where the contents S are packaged, the folding ruled lines 26, 28, 30, and 34 of the box body forming piece 16 are folded forward at 90 degrees, respectively, and the first to fourth side plates 18, 20, A quadrangular tubular body 12 composed of 22, 24 and a gluing plate 32 is formed. Then, in order to close the lower end of the tubular body 12 with the lid portion 14 (2), the side flaps 40 (2) and 60 (2) are 90 degrees at the fold ruled lines 42 (2) and 62 (2), respectively. The inner lid piece 64 (2) is folded forward at 90 degrees along the fold ruled line 66 (2). Then, after applying glue 72 (2) to the surface side of the convex region 48a (2) of the auxiliary piece 48 (2), the outer lid piece 44 (2) is positively set to 90 degrees along the first folding ruled line 46 (2). Fold it and glue the auxiliary piece 48 (2) on the inner lid piece 64 (2). As a result, the lower lid portion 14 (2) is formed, and the box body forming piece 16 is in the state shown in FIGS. 5 (a) and 5 (b).

To briefly explain this state, in the tubular body 12, the glue plate 32 overlaps the inner surface of the first side plate 18 and is glued with glue 70, and the four side plates 18, 20, 22, and 24 are continuous in the circumferential direction. The first and third side plates 18 and 22 face each other in the left-right direction, and the second and fourth side plates 20 and 24 face each other in the front-rear direction. The upper end of the cylinder 12 is open.

The lid portion 14 (2) that closes the lower end of the tubular body 12 includes side flaps 40 (2), 60 (2), an inner lid piece 64 (2), an auxiliary piece 48 (2), and an outer lid piece. 44 (2) overlap in order from the inside. The auxiliary piece 48 (2) is folded at the second fold ruled line 50 (2), and one surface (the back surface of the base material) overlaps the inner surface of the outer lid piece 44 (2) and is glued with glue 68 (2). The opposite surface (surface of the base material) overlaps the outer surface of the inner lid piece 64 (2) and is glued with glue 72 (2). When gluing the auxiliary piece 48 (2) and the inner lid piece 64 (2), it is difficult to position both firmly, but a sufficient amount of glue 72 (applied in the recess of the convex region 48a (2)) By 2), it is firmly joined.

In the first flexible tongue piece 52 (2) extended to the auxiliary piece 48 (2), the end side in the extending direction is locked to the inner surface of the second side plate 20, and the third fold ruled line 54 (2) is bent and bent inward, and is diagonally arranged inside the opening portion 56 (2). Further, in the second flexible tongue piece 36 (2) extended to the gluing plate 32, the end edge in the extending direction is locked to the inner surface of the side flap 40 (2), and the fourth fold ruled line 38 (2) 2) is bent and bent inward so that it is diagonally arranged inside the side flap 40 (2).

Then, from the upper end of the tubular body 12, the container S in which the PTP sheets are bundled is put into the inside. When the container S is placed, the PTP sheet is placed so that the thickness direction (the direction in which the storage portion containing the tablets or the like protrudes) is arranged in the front-rear direction of the packaging box 10.

Then, when the upper lid portion 14 (1) is assembled and closed, the packaging box 10 shown in FIGS. 6 (a) and 6 (b) and FIGS. 1 (a) and 1 (b) is in the assembled state. The procedure for assembling the lid portion 14 (1) and the state of the assembled lid portion 14 (1) are the same as those of the lid portion 14 (2) described above.

When opening the packaging box 10, either the lid portion 14 (1) or the lid portion 14 (2) may be opened. When opening the lid portion 14 (1), the opening portion 56 (1) is pushed in with a finger to break the opening breaking line 58 (1), and the opening portion 56 (1) and the outer lid piece 44 (1) are broken. Is separated from the second side plate 20. Then, as shown in FIG. 7A, when the outer lid piece 44 (1) and the like are pulled up greatly, and the side flaps 40 (1) and 60 (1) are further pulled up, the upper end portion of the tubular body 12 is raised. It can be opened and the contents S (not shown) inside can be taken out.

When resealing after opening the packaging box 10, first, the side flaps 40 (1) and 60 (1) are tilted, and then the outer lid piece 44 (1) is tilted. When the outer lid piece 44 (1) is tilted, the wide tip of the first flexible tongue piece 52 (1) is inserted into the gap (notch) between the side flaps 40 (1) and 60 (1). The engaging portion 52a (1) of the first flexible tongue piece 52 (1) is inserted into the struck portion) by guiding it with a finger, and the engaging portion 52a (1) of the first flexible tongue piece 52 (1) is inserted into the engaging portion 40a of the side flaps 40 (1) and 60 (1). Engage with (1) and 60a (2). When the engaging portion 52a (1) engages with the engaging receiving portions 40a (1) and 0a (1), the lid portion 14 (1) is held in the closed state, and the resealed state shown in FIG. 7 (b). become.

When the packaging box 10 is opened and then discarded, the unopened lid portion 14 (2) is opened. The opening of the lid portion 14 (2) is the same as the procedure for opening the lid portion 14 (1) described above. When the two lids 14 (1) and 14 (2) are opened, the packaging box 10 can be folded flat, so that the packaging box 10 can be compactly discarded.

As described above, the packaging box 10 has a simple structure and is very easy to assemble. Since the lids 14 (1) and 14 (2) are provided with the unique first flexible tongue pieces 52 (1) and 52 (2), the contents S in the box body can be moved back and forth. It can be protected as a buffer so that it does not shake significantly in the direction. Further, since the second flexible tongue pieces 36 (1) and 36 (2) are provided, the contents S in the packaging box 10 are protected in a buffering manner so as not to be shaken significantly in the left-right direction. be able to.

The packaging box 10 also has a resealing function. For example, after opening the lid portion 14 (1), the engaging portion 52 (1) of the first flexible tongue piece is attached to the side flap 40 (1), By engaging the engaging receiving portions 40a (1) and 60a (1) of the 60 (1), the lid portion 14 (2) can be held in the closed state.

The packaging box of the present invention is not limited to the above embodiment. For example, the shape of the engaging portion of the first flexible piece and the shape of the engaging receiving portion of the side flap may be any shape as long as they can be assembled and resealed by the procedure described above. It can be changed or adjusted as appropriate according to the thickness and material of the material.

Further, in the case of the packaging box 10, both of the two lids are the lids of the present invention (the lids provided with the first flexible tongue piece and the like), but only one of the lids of the present invention is used. It can also be a lid. When only one lid portion is used as the lid portion of the present invention, it is preferable that the lid portion arranged on the lower side during transportation is the lid portion of the present invention, and the lower part of the container is the first flexible portion. It can be buffered and supported by a piece of sex tongue.

10 Packaging box 12 Cylinder 14 (1), 14 (2) Cover 16 Box forming piece 18 First side plate 20 Second side plate 22 Third side plate 24 Third side plate 24 Fourth side plate 32 Glue plate 36 (1), 36 (2) Second flexible tongue piece 38 (1), 38 (2) Fourth fold ruled line 40 (1), 40 (2), 60 (1), 60 (2) Side flap 40a (1), 40a (2), 60a (1), 60a (2) Engagement receiving portions 44 (1), 44 (2) Outer lid pieces 46 (1), 46 (2) First fold ruled line 48 ( 1), 48 (2) Auxiliary pieces 48a (1), 48a (2) Convex areas 50 (1), 50 (2) Second fold ruled lines 52 (1), 52 (2) First flexible tongue piece 52a (1), 52a (2) Engagement part 54 (1), 54 (2) Third fold ruled line 56 (1), 56 (2) Opening part 58 (1), 58 (2) Opening break line 64 (1), 64 (2) Inner lid piece 68 (1), 68 (2), 70, 72 (1), 72 (2) Glue

Claims (5)

A square having first to fourth side plates that are continuous in the circumferential direction, the first and third side plates facing each other in the left-right direction, and the second and fourth side plates facing each other in the front-rear direction. The outer lid piece extending to the end side of the second side plate via the first folding line, and the inner lid piece extending to the end side of the fourth side plate. A pair of side flaps extending from each end of the first and third side plates, and an opening portion of the second side plate provided at the end of the first fold line and opened. Sometimes, the outer lid piece and the opening portion are provided with an opening breaking line for separating the opening portion from the second side plate, and the side flap, the inner lid piece, and the outer lid piece are in the assembled state before opening. In a seal-end type packaging box that is stacked in order from the inside and the outer lid piece and the inner lid piece are joined to form a lid portion.
The lid portion includes an auxiliary piece extending from the outer lid piece in the extending direction via a second folding ruled line parallel to the first folding ruled line, and an auxiliary piece extending in the extending direction. A first flexible tongue piece extending through a third fold ruled line parallel to the second fold ruled line is provided at the center of the side, and the first flexible tongue piece has a base. A pair of engaging portions projecting in opposite directions are provided by notching both sides of the end portions inward, and the two side flaps have a side surface or a tip angle close to the outer lid piece. By notching the portion, an engaging receiving portion with which the engaging portion of the first flexible tongue piece can be engaged is provided.
In the assembled state before opening, the auxiliary piece is folded at the second folding ruled line, one side overlaps the inner surface of the outer lid piece and is glued, and the other side overlaps the outer surface of the inner lid piece. The first flexible tongue piece is glued so that the end edge in the extending direction is locked to the inner surface of the second side plate, and the third folding ruled line is broken and bent inward. Arranged diagonally inside the opening
After the opening break line is cut off and opened, the side flap, the inner lid piece, and the outer lid piece are sequentially overlapped in a resealed state, and the engagement of the first flexible tongue piece. A packaging box characterized in that the lid portion is held in a closed state by engaging the joint portion with the engagement receiving portion of the side flap. Inside the auxiliary piece, a convex region formed in a convex embossed shape on the outer surface side is provided, and in the assembled state before opening, the auxiliary piece is said by the glue in the recess on the inner surface side of the convex region. The packaging box according to claim 1, which is glued to the outer surface of the inner lid piece. The packaging box according to claim 1 or 2, wherein the lids are provided in pairs at both ends of the cylinder. The packaging box according to any one of claims 1 to 3, which is formed by assembling one box body forming piece. In the box body forming piece, the first to fourth side plates are connected in a row with the second or fourth side plates arranged at the ends, and the second or fourth side plate located at the ends. A gluing plate is extended to the end side of the face plate in the connecting direction, and a second flexible tongue piece is placed on the end side of the gluing plate close to the member constituting the lid portion via a fourth fold ruled line. Extended,
In the assembled state before opening, the glue plate is glued to the inner surface of the first or third side plate located at the opposite end to form the cylinder, and the second flexible tongue piece is Claims 1 to 3, wherein the end side in the extending direction is locked to the inner surface of the side flap, and the fourth fold ruled line is folded and bent inward to be obliquely arranged inside the side flap. The packaging box described in either.

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