JP7207200B2 - Packaging box and blank sheet - Google Patents

Description

The present invention relates to packaging boxes and blank sheets.

A corrugated cardboard packaging box includes a cylindrical body, a top plate and a bottom plate, and by cutting a cutout from the top plate to the body, a part of the packaging box is opened and the contents can be released as it is. There are known products that can be displayed (see Patent Document 1, for example).

In the packaging box of Patent Literature 1, of the long side plates and the short side plates that form the body portion, the long side plate is formed with an unsealing portion.

JP 2018-203326 A

By the way, depending on the store that sells the contents, the contents may be displayed with the short side plate of the packaging box facing the customer's eye rather than the long side plate for the convenience of displaying the contents. In this case, if the opening portion is provided on the short side plate of the conventional packaging box, the sealing tape that seals the top and bottom faces will appear on the front side, spoiling the appearance of the box.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide a packaging box and a blank sheet in which the contents can be displayed with the short side plates on the front side visible to customers without impairing the appearance.

In order to solve the above-mentioned problems, the present invention provides a trunk portion consisting of a pair of long side plates and a pair of short side plates facing each other, a top plate connected to the upper edge of the trunk portion, and a and a bottom plate connected to the edge. The top plate includes an upper inner flap connected to the upper edges of the pair of long side plates, and an upper outer flap connected to the upper edges of the pair of short side plates and abutted against each other. ing. The bottom plate includes a lower inner flap connected to the lower edge portions of the pair of long side plates and a lower outer flap connected to the lower edge portions of the pair of short side plates and abutted against each other. and have. At least one of the short side plates is formed with an unsealing portion that is unsealed by a break guide wire. The length in the extending direction of the upper inner flap and the lower inner flap connected to one of the long side plates is the extension of the upper outer flap and the lower outer flap connected to the short side plate. Same as direction length. The length in the extending direction of the upper inner flap and the lower inner flap connected to the other long side plate is equal to the length of the upper inner flap and the lower inner flap connected to one of the long side plates. The length to be butted.

In the packaging box of the present invention, the contents can be displayed with the short side plate in which the opening portion is formed on the front side that is visible to the customer. Since the flaps connected to the short side plates are the upper outer flaps and the lower outer flaps, both ends of the sealing tape that seals the upper outer flaps and the lower outer flaps are on the left and right sides of the long side plates. appears in the Therefore, the ends of the sealing tape do not appear on the short side plates, and the contents can be displayed without impairing the appearance even if the short side plates are on the front side where customers can see them.

Further , the upper outer flaps and the lower inner flaps respectively connected to the short side plates are butted against each other, and the upper inner flaps and the lower inner flaps respectively connected to the long side plates are butted against each other. Therefore, the strength of the box is improved. In addition, the bottom of the box can be flattened by abutting the lower inner flaps connected to the long side plates. Therefore, the contents can be accommodated flat in the box.

Moreover, it is preferable that one of the long side plates is joined to the short side plate via a joining piece.

In this packaging box, since the ends of the long side plate and the short side plate have the same length when the body is joined, it is easy to align the ends and to correct misalignment between the ends. Therefore, it is easy to manufacture with a flexo folder gluer having a squaring process for correcting misalignment between ends.

Further, the blank sheet of the present invention is a blank sheet for use in manufacturing a packaging box, comprising a body portion comprising a pair of opposing long side plates and a pair of opposing short side plates, and a body portion connected to the upper edge of the body portion. and a bottom plate connected to the lower edge of the body. The top plate includes an upper inner flap connected to the upper edges of the pair of long side plates and an upper outer flap connected to the upper edges of the pair of short side plates and abutted against each other. ing. The bottom plate includes a lower inner flap connected to each lower edge of the pair of long side plates, and a lower outer flap connected to each lower edge of the pair of short side plates and abutted against each other. It has At least one of the short side plates is formed with an unsealing portion that is unsealed by a break guide wire. The length in the extending direction of the upper inner flap and the lower inner flap connected to one of the long side plates is the extension of the upper outer flap and the lower outer flap connected to the short side plate. It's the same length as the length. In addition, the lengths in the extending direction of the upper inner flap and the lower inner flap connected to the other long side plate are It is the length that is butted against the flap. One of the long side plates is joined to the short side plate via a joining piece.

The blank sheet of the present invention can form a packaging box in which the contents can be displayed with the short side plate having the opening formed on the front side visible to the customer. Since the flaps connected to the short side plates are the upper outer flaps and the lower outer flaps, both ends of the sealing tape that seals the upper outer flaps and the lower outer flaps are on the left and right sides of the long side plates. appears in the Therefore, the ends of the sealing tape do not appear on the short side plates, and even if the short side plates are on the front side visible to the customer, the contents can be displayed without impairing the appearance of the packaging box.

Further, when a box is assembled using the blank sheet of the present invention, the upper outer flaps connected to both short side plates and the lower outer flaps connected to each other are butted against each other, and the upper inner flaps connected to both long side plates are brought into contact with each other. Since the lower inner flaps are butted against each other and against each other, the strength of the box is improved. In addition, the bottom of the box can be flattened by abutting the lower inner flaps connected to the long side plates. Therefore, the contents can be accommodated flat in the box.

Also, in the blank sheet of the present invention, when joining the body portions, the ends of one of the long side plates and one of the short side plates have the same length, so the ends are easily aligned and the ends can be easily joined together. It is easy to correct the misalignment. Therefore, it is suitable for manufacturing with a flexo folder gluer having a squaring process for correcting misalignment between ends.

In the packaging box and the blank sheet of the present invention, the contents can be displayed with the short side plate facing the customer's eye without impairing the appearance.

It is the perspective view which looked at the packaging box before opening which concerns on embodiment of this invention from the front upper left. It is the figure which showed the blank sheet of the packaging box which concerns on embodiment of this invention. (a) is a plan view showing a packaging box according to an embodiment of the present invention, and (b) is a front view of the same. It is the perspective view which looked at the state which opened the packaging box which concerns on embodiment of this invention from the front upper left. It is a front view which shows the state which opened the packaging box which concerns on embodiment of this invention. It is the perspective view which showed the state which piled up the packaging box which concerns on embodiment of this invention.

Embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
In the following description, the front, rear, left, and right directions are set for convenience in describing the packaging box of the present embodiment, and do not limit the configuration of the packaging box of the present invention.

As shown in FIG. 1, the packaging box 1 of the present embodiment includes a rectangular tubular body 10, a top plate 20 connected to the upper edge of the body 10, and a bottom plate 20 connected to the lower edge of the body 10. and a bottom plate 30 provided thereon. The packaging box 1 of this embodiment is an A-type cardboard box. As will be described later, the packaging box 1 is formed with an unsealing portion 40 extending from the front short side plate 11 to the upper outer flap 21 and serving as an opening for taking out the contents.

As shown in FIG. 2, the packaging box 1 is formed by mountain-folding or valley-folding a blank sheet S obtained by cutting out a corrugated cardboard sheet. The blank sheet S shown in FIG. 2 is arranged so that the inner side can be seen.
Each ruled line (folded line) of the blank sheet S is a linear groove (press ruled line) formed by pressing the inner surface of the blank sheet S. As shown in FIG. Note that notches may be formed in the ruled lines. By doing so, it becomes easier to fold the blank sheet S at the ruled line.

As shown in FIG. 1, the body 10 has a pair of front and rear short side plates 11 and 12 and a pair of left and right long side plates 13 and 14 . The short side plates 11, 12 and the long side plates 13, 14 are rectangular side plates.
A left long side plate 13 is connected to the left edge of the front short side plate 11 via a ruled line. A right long side plate 14 is connected to the right edge of the front short side plate 11 via a ruled line. A band-shaped joining piece 15 is continuously provided on the rear edge of the left long side plate 13 via a ruled line. The rear short side plate 12 is connected to the rear edge of the right long side plate 14 via a ruled line.

When the blank sheet S (see FIG. 2) is folded along each ruled line and the joint piece 15 is joined to the inner surface of the rear short side plate 12 by hot melt or other adhesive means, the front and rear short side plates 11 and 12 and the left and right long side plates 11 and 12 are joined together. Together with the side plates 13 and 14, a square tube-shaped trunk portion 10 is formed.

A front fracture guide line L10 is formed on the front short side plate 11 . The front fracture guide line L10 is a perforated line in which notches are intermittently formed. The interval and shape of the notch of the front fracture guide line L10 are not limited.

As shown in FIG. 3(b), the front fracture guide line L10 is formed in a concave shape when viewed from the front. The front breaking guide line L10 includes a first guide line L11 extending in the left-right direction, and second guide lines L12, L12 connected to both the left and right ends of the first guide line L11 and extending upward from the left and right ends. there is

The first guide line L11 is arranged below the short side plate 11 . The central portion of the first guide line L11 is arranged in the central portion of the short side plate 11 in the left-right direction. An opening start portion 41a that bulges downward in a substantially semicircular shape is formed in the central portion of the first guide line L11. The opening start part 41a is a part that becomes a starting point at the time of opening. When opening the packaging box 1, the opening start hole into which fingers can be inserted is opened by pushing the opening start part 41a from the outside to the inside.
The left and right ends of the first guide line L11 are arcuately formed upward.
The substantially straight portion of the first guide line L11 extending in the left-right direction is parallel to the upper edge and lower edge of the short side plate 11, as shown in FIG. It is perpendicular to the left and right edges.

The second guide lines L12, L12 are formed linearly from both ends of the first guide line L11 to the upper edge of the short side plate 11. As shown in FIG. The second guide lines L12, L12 are formed perpendicular to the upper and lower edges of the short side plate 11 and parallel to the side edges of the short side plate 11. As shown in FIG.

The front short side plate 11 is formed with a front opening portion 41 defined by a first guide line L11, left and right second guide lines L12, L12, and an upper edge. The front unsealing portion 41 is a substantially rectangular area cut by the first guide line L11 and the left and right second guide lines L12, L12.

The interval in the left-right direction between the left and right second guide lines L12, L12 is the width of the opening 50 formed in the short side plate 11 when the front opening portion 41 is cut away from the short side plate 11, as shown in FIGS. width in the horizontal direction. Therefore, the horizontal interval between the left and right second guide lines L12, L12 is set in consideration of how the contents can be seen through the opening 50 and how easily the contents can be taken out from the opening 50.

The top plate 20 closes the upper opening of the body 10, as shown in FIG. The top plate 20 has a pair of front and rear upper outer flaps 21, 21 connected to the upper edges of the front and rear short side plates 11, 12. As shown in FIG. A pair of left and right upper inner flaps 22 , 23 connected to the upper edges of the left and right long side plates 13 , 14 are superimposed on the inner surface (lower surface) of the top plate 20 .

The front upper outer flap 21 is a rectangular flat plate and extends rearward from the upper edge of the front short side plate 11 . The front half of the upper opening of the body portion 10 is closed by the upper outer flap 21 on the front side.
The rear upper outer flap 21 is a rectangular flat plate and extends forward from the upper edge of the rear short side plate 12 . The rear half of the upper opening of the trunk portion 10 is closed by the upper outer flap 21 on the rear side.

The edge portions 21b of the front and rear upper outer flaps 21, 21 are butted against each other at the central portion in the front-rear direction. By joining the edge portions 21b of the upper outer flaps 21 and 21 with an adhesive tape T (see FIGS. 1 and 4) as a sealing tape, the upper opening of the trunk portion 10 is opened by the upper outer flaps 21 and 21. part is blocked. That is, with the short side plate 11 facing the front side, the adhesive tape T is adhered in the left-right direction across the pair of left and right long side plates 13 and 14 , and both ends T1 and T1 of the adhesive tape T are attached to the left and right long side plates 13 . , 14 are exposed.

An upper breaking guide line L20 is formed in the upper outer flap 21 on the front side. The upper breaking guide line L20 is a perforated line in which notches are intermittently formed. The interval and shape of the slits of the upper breaking guide line L20 are not limited.

The upper breaking guide line L20 includes a third guide line L21 extending in the left-right direction, left and right inclined guide lines L22 extending obliquely from the left and right ends of the third guide line L21 toward the front edge of the upper outer flap 21, and L22.

As shown in FIG. 3(a), the third guide line L21 is arranged on the front upper outer flap 21 on the rear side (the tip side of the upper outer flap 21) from the front-rear central portion thereof. The central portion of the third guide line L21 is arranged in the central portion of the upper outer flap 21 in the left-right direction. Left and right ends of the third guide wire L21 are formed in an arc shape toward the front side.
The straight portion of the third guide line L21 is parallel to the leading edge and trailing edge of the upper outer flap 21 . The length of the third guide line L21 is shorter than the interval in the horizontal direction between the second guide lines L12, L12.

As shown in FIG. 1, the inclined guide lines L22, L22 extend obliquely from the central side of the top plate 20 toward the short side plate 11 on the front side. The left inclined guide line L22 is formed from the left end of the third guide line L21 to the upper end of the left second guide line L12. The right inclined guide line L22 is formed from the right end of the third guide line L21 to the upper end of the right second guide line L12.
The interval between the two inclined guide lines L22, L22 in the left-right direction widens from the center side of the top plate 20 toward the short side plate 11 on the front side.

The upper outer flap 21 on the front side is formed with an upper unsealing portion 42 defined by the upper breaking guide line L20 and the front edge of the upper outer flap 21 . The upper unsealable portion 42 is a region having a substantially trapezoidal shape in plan view, and the width in the left-right direction increases from the center side of the top plate 20 toward the short side plate 11 on the front side.
The front unsealable portion 41 and the upper unsealable portion 42 described above are continuously formed to form the unsealable portion 40 . That is, the opening portion 40 is formed over the short side plates 11 of the trunk portion 10 and the upper outer flaps 21 of the top plate 20 . In this way, since the unsealing portion 40 is formed from the short side plate 11 to the upper outer flap 21, the opening 50 can be opened wide when unsealing, so that the contents can be displayed and exhibited easily, and the contents can be easily taken out (FIGS. 4, 4 and 5). 5).

The left upper inner flap 22 extends rightward from the upper edge of the left long side plate 13 . The upper inner flap 22 extends rightward with the same length as the upper outer flaps 21, 21, as shown in FIG. As a result, in the state of the blank sheet S, the edge portion 22b of the upper inner flap 22 is located on the extension of the edge portion 21b of the upper outer flap 21 . As shown in FIG. 3A, the front edge portion 22a of the upper inner flap 22 extends in a substantially L shape along the inclined guide line L22 on the left side of the upper outer flap 21. As shown in FIG. The front edge portion 22a overlaps the left inclined guide line L22 in plan view.

The right upper inner flap 23 extends leftward from the upper edge of the right long side plate 14 . The edge portion 23b of the upper inner flap 23 is shorter than the upper inner flap 22 so as to abut against the edge portion 22b of the opposing upper inner flap 22, as shown in FIGS. 1 and 3(a). It extends to the left. Accordingly, as shown in FIG. 2, in the state of the blank sheet S, the edge portion 23b of the upper inner flap 23 is located closer to the long side plate 14 than the edge portion 21b of the upper outer flap 21 is. As shown in FIG. 3A, the front edge portion 23a of the upper inner flap 23 extends in a substantially L shape along the inclined guide line L22 on the right side of the upper outer flap 21. As shown in FIG. The front edge portion 23a overlaps the right inclined guide line L22 in plan view. The left and right upper inner flaps 22 and 23 overlap the inner surfaces (lower surfaces) of the front and rear upper outer flaps 21 and 21 .
The abutting portion 20b between the upper inner flap 22 and the upper inner flap 23 is, as shown in FIG.

The bottom plate 30 closes the lower opening of the body 10, as shown in FIG. The bottom plate 30 has a pair of front and rear lower outer flaps 31, 31 connected to the lower edges of the front and rear short side plates 11, 12. As shown in FIG. A pair of left and right lower inner flaps 32 , 33 connected to the lower edges of the left and right long side plates 13 , 14 are superimposed on the inner surface (upper surface) of the bottom plate 30 .

The front lower outer flap 31 is a rectangular flat plate extending rearward from the lower edge of the front short side plate 11 . The front half of the lower opening of the trunk 10 is closed by the lower outer flap 31 on the front side.
The rear lower outer flap 31 is a rectangular flat plate extending forward from the lower edge of the rear short side plate 12 . A rear lower outer flap 31 closes the rear half of the lower opening of the trunk section 10 .

Edge portions 31b of the front and rear lower outer flaps 31, 31 are butted against each other at the central portion in the front-rear direction. Then, by joining the edge portions 31b of the lower outer flaps 31, 31 with an adhesive tape T (see FIGS. 1 and 4), the lower opening of the body portion 10 is formed by the lower outer flaps 31, 31. is blocked. That is, with the short side plate 11 as the front side, the adhesive tape T is adhered in the left-right direction across the pair of left and right long side plates 13, 14, and both ends T1, T1 of the adhesive tape T are attached to the left and right long side plates 13, 14. 14 are exposed at the bottom of each.

The left lower inner flap 32 is, as shown in FIG. 1, a rectangular flat plate extending rightward from the lower edge of the left long side plate 13 . The lower inner flap 32 extends rightward with the same length as the lower outer flaps 31, 31, as shown in FIG. Thus, as shown in FIG. 2, the edge 22b of the lower inner flap 32 is located on the extension of the edge 31b of the lower outer flap 31 in the blank sheet S state.

As shown in FIG. 1, the right lower inner flap 33 is a rectangular flat plate and extends leftward from the lower edge of the right long side plate 14 . The edge portion 33b of the lower inner flap 33, as shown in FIGS. also extends to the left with a short length. Accordingly, as shown in FIG. 2, in the state of the blank sheet S, the edge portion 33b of the lower inner flap 33 is located closer to the long side plate 14 than the edge portion 31b of the lower outer flap 31 is. The left and right lower inner flaps 32 and 33 overlap the inner surfaces (upper surfaces) of the front and rear lower outer flaps 31 and 31 .

The butted portion 20b between the lower inner flap 32 and the lower inner flap 33 is, as shown in FIG. Here, when a content such as a spherical content with a large weight is contained in the packaging box 1 in which the load is concentrated in the central portion in the left-right direction, if the abutting portion 20b is provided in the central portion in which the load is concentrated, the load will be reduced. There is a possibility that a phenomenon called "bottom dropout" occurs, in which the closed state of the bottom plate 30 is released due to being unable to withstand the pressure. On the other hand, if the butted portion 20b is biased to the right side, even if the packaging box 1 contains the contents whose load concentrates on the central portion in the left-right direction, the butted portion 20b will be located at the portion where the load is concentrated. Since it does not exist, it is possible to prevent bottoming out.

With the configuration described above, as shown in FIG. It has the same length as the length L2 including the left edge of the side short side plate 12, the left edge of the upper outer flap 21 and the left edge of the lower outer flap 31. That is, when joining the long side plate 13 and the short side plate 12 adjacent to each other using the joining piece 15 from the blank sheet S, since the lengths L1 and L2 are the same length, the alignment of the ends is performed. is easy.

When the contents are housed in the packaging box 1 of the present embodiment and transported or stored, the packaging box 1 is arranged so that the top plate 20 faces upward, as in a general A-type corrugated cardboard box.
When opening the packaging box 1 of this embodiment, an operator's finger is inserted into the opening start portion 41a of the short side plate 11 and the front opening portion 41 is pulled up. Then, the front tear guide line L10 is cut open toward the top plate 20, and the front opening portion 41 is cut off. Subsequently, when the separated front side unsealing portion 41 is further pulled up, the upper breaking guide line L20 of the top plate 20 is cut open, and the upper side unsealing portion 42 is cut off. As a result, the opening portion 40 is cut off from the front short side plate 11 to the upper outer flap 21 of the top plate 20 to form the opening portion 50 .

In the packaging box 1 of the present embodiment described above, the contents can be displayed with the short side plate 11 formed with the unsealable portion 40 facing the customer's eyes. Since the flaps connected to the short side plate 11 are the upper outer flaps 21 and the lower outer flaps 31, both ends T1, T1 of the adhesive tape T for sealing the upper outer flaps 21 and the lower outer flaps 31. appears on both long side plates 13 and 14, which are left and right side surfaces. Therefore, the ends T1, T1 of the adhesive tape T do not appear on the short side plate 11, and even if the short side plate 11 is placed on the front side where the customer sees, the contents can be displayed without impairing the appearance.

Also, the upper and lower outer flaps 21, 21 and 31, 31 of the short side plates 11, 12 are butted against each other, and the upper and lower inner flaps 22, 23 of the long side plates 13, 14 and the lower inner flaps are abutted against each other. Since 32 and 33 are abutted against each other, the strength of the packaging box 1 is improved. In addition, the lower inner flaps 32, 33 of the long side plates 13, 14 are abutted against each other, so that the bottom surface of the packaging box 1 can be formed flat. Therefore, the contents can be accommodated in the packaging box 1 flatly.

In addition, since the strength of the top plate 20 and the bottom plate 30 can be sufficiently secured even after opening, as shown in FIG. can.

In addition, when the trunk portion 10 is joined via the joining piece 15, the ends of the long side plate 13 and the short side plate 12 have the same length L1 (L2). It is easy to correct the deviation between them. Therefore, it is suitable for manufacturing with a flexo folder gluer having a squaring process for correcting misalignment between ends.

Further, the blank sheet S of the present embodiment can form the packaging box 1 in which the contents can be displayed with the short side plate 11 having the opening portion 40 formed on the front side visible to the customer. Since the flaps connected to the short side plate 11 are the upper outer flaps 21 and the lower outer flaps 31, when the packaging box 1 is assembled, the adhesive tapes for sealing the upper outer flaps 21 and the lower outer flaps 31 are used. Both ends T1, T1 of T appear on both long side plates 13, 14, which are left and right side surfaces. Therefore, the ends T1, T1 of the adhesive tape T do not appear on the short side plate 11, and even if the short side plate 11 is on the front side visible to the customer, the packaging box 1 can display the contents without impairing the appearance. can be formed.

In addition, when the packaging box 1 is assembled, the blank sheet S of the present embodiment abuts the upper outer flaps 21 and 21 of the short side plates 11 and 12 and the lower outer flaps 31 and 31 of the short side plates 11 and 12 against each other. Since the upper inner flaps 22, 23 and the lower inner flaps 32, 33 of 13, 14 are butted against each other, the strength of the packaging box 1 is improved. In addition, since the lower inner flaps 32, 33 of both long side plates 13, 14 are abutted against each other, the bottom surface of the packaging box 1 can be formed flat, so that the packaging box 1 can accommodate the contents flatly. can be formed.

In addition, in the blank sheet S of the present embodiment, when joining the body portion 10, the ends of the long side plate 13 and the short side plate 12 have the same length L1 (L2), so the ends can be easily aligned. , the misalignment between the ends can be easily corrected. Therefore, it is suitable for manufacturing with a flexo folder gluer having a squaring process for correcting misalignment between ends.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and can be appropriately modified without departing from the scope of the invention.
For example, although the unsealable portion 40 is composed of the front unsealable portion 41 and the upper unsealable portion 42, it is not limited to this, and only the front unsealable portion 41 may be formed. In this case, the upper inner flap 22 of the long side plate 13 does not need to be formed with the concave front edge portion 22a, so the upper inner flap 22 can be a rectangular flat plate. As a result, the length including the front edge of the left long side plate 13, the front edge of the upper inner flap 22 and the front edge of the lower inner flap 32 is extended to the left edge of the front short side plate 11 and the upper outer flap. 21 and the length including the left edge of the lower outer flap 31. Therefore, the joint piece 15 can be arranged between the short side plate 11 and the long side plate 13 to form the packaging box 1 or the blank sheet S. can be obtained.

In the above-described embodiment, the unsealable portion 40 is formed on the front short side plate 11 side. Also, the opening portion 40 may be formed on both the front and rear short side plates 11 and 12 .

Although the packaging box 1 of the present embodiment is made of cardboard, the packaging box may be formed of various known paperboards.

1 packaging box 10 body 11, 12 short side plate 13, 14 long side plate 15 joining piece 20 top plate 21 upper side outer flap 22, 23 upper side inner flap 30 bottom plate 31 lower side outer flap 32, 33 lower side inner flap 40 opening part 41 front side Opening part 42 Upper opening part 50 Opening part L10 Front side breakage guide wire (breakage guide wire)
L20 Upper fracture induction wire (breakage induction wire)
S blank sheet

Claims (3)

a body portion consisting of a pair of opposing long side plates and a pair of opposing short side plates;
a top plate connected to the upper edge of the trunk;
a bottom plate connected to the lower edge of the trunk,
The top plate is
an upper inner flap connected to each upper edge of the pair of long side plates;
an upper outer flap connected to each upper edge of the pair of short side plates and butted against each other;
The bottom plate is
a lower inner flap connected to each lower edge of the pair of long side plates;
lower outer flaps connected to the lower edges of the pair of short side plates and abutted against each other;
At least one of the short side plates is formed with an unsealing portion that is unsealed by a fracture guide line ,
The length in the extending direction of the upper inner flap and the lower inner flap connected to one of the long side plates is the extension of the upper outer flap and the lower outer flap connected to the short side plate. is the same as the length of the direction, and
The length in the extending direction of the upper inner flap and the lower inner flap connected to the other long side plate is equal to the length of the upper inner flap and the lower inner flap connected to one of the long side plates. A packaging box characterized by being butted lengths. 2. The packaging box according to claim 1 , wherein one of the long side plates is joined to the short side plate via a joining piece. a body portion consisting of a pair of opposing long side plates and a pair of opposing short side plates;
a top plate connected to the upper edge of the trunk;
A blank sheet used for manufacturing a packaging box comprising a bottom plate connected to the lower edge of the body,
The top plate is
an upper inner flap connected to each upper edge of the pair of long side plates;
an upper outer flap that is connected to the upper edges of the pair of short side plates and abutted against each other;
The bottom plate is
a lower inner flap connected to each lower edge of the pair of long side plates;
a lower outer flap that is connected to each lower edge of the pair of short side plates and abutted against each other;
At least one of the short side plates is formed with an unsealing portion that is unsealed by a fracture guide line,
The length in the extending direction of the upper inner flap and the lower inner flap connected to one of the long side plates is the extension of the upper outer flap and the lower outer flap connected to the short side plate. is the same length as the length,
The length in the extending direction of the upper inner flap and the lower inner flap connected to the other long side plate is equal to the length of the upper inner flap and the lower inner flap connected to one of the long side plates. is the butted length,
A blank sheet, wherein one of the long side plates is joined to the short side plate via a joining piece.

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