JP2009029458A - Packaging box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging box, in which an upper flap and a lower flap are connected without using adhesive means and has no clearance for a foreign substance in the box end side, so that it is prevented from being opened in an unauthorized manner and from leaking any liquid. <P>SOLUTION: The lower flap 8 and a double-folded flap are pushed into a box by the upper flap 12, thereby to form a folding assembly 27, the end portions of which come into close contact with each other on the sides opposed to the double-folded side of the double-folded flap. The end portion of the upper side of the lower flap 8 and the end portions of the double-folded flap on the side opposed to the double-folded side of the upper side gather to form an end assembly, so that the two sides of the folded root portion of the upper flap 12 come into close contact with and cover the end assembly. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a packaging box, and more particularly to a paper packaging box in which food can be heated by a microwave oven in a state where cooked food is accommodated.

Conventionally, many foods such as cooked French fries and chicken nuggets that can be eaten simply by heating and cooking in a microwave oven are in circulation. And there is a product that provides these foods as frozen foods in a state where they are contained in a packaging box, and that can be cooked in a microwave oven while containing the foods in the packaging box. In many cases, sales forms are arranged in a showcase.
As described above, the paper packaging box for storing the frozen food is a box formed by assembling one blank in the same manner as a general paper box. In this box, a top plate, a back plate, a bottom plate, and a front plate are connected via a folding part to form a box body, and flaps for closing both ends of the box body are on the side of the box body end side. For example, the inner flap connected to the box body end side of the front plate and the back plate is folded, and the lower flap connected to the box body end side of the bottom plate is folded up. The upper flap is overlapped with the inner flap, and the upper flap connected to the box body end portion side of the upper surface plate is folded and overlapped with the lower flap, and the upper flap and the lower flap are bonded together with an adhesive.

In the packaging box, the upper flap and the lower flap are bonded together using an adhesive. However, in order to rationalize the production line for frozen products, the bonding process can be omitted and closed without using an adhesive. Things are also desired.
As a paper box that meets such demands, as shown in Patent Document 1, a slit is provided in the folding origin of the lower flap located at the end of the box body, and a locking piece protrudes from the upper flap. When the upper flap is stacked on the lower flap, the locking piece is inserted into the slit, and the end of the inserted locking piece is detachably locked to the end of the slit so that the upper flap is lowered. Conventionally, there is a structure fixed to a flap. In addition, as shown in Patent Document 2, a long hole into which a locking piece located at the upper part of the lower flap can be inserted is provided in the center portion of the upper flap, and the side flap is overlapped on the upper flap. Further, there has been proposed a structure in which a locking piece of a lower flap is inserted into a long hole so that it can be inserted and removed while being overlapped and pressed on the side flap.
Public utility Showa 61-053313 Japanese Patent Application Showa 61-161212

  However, frozen foods have the following inconvenience because they are arranged in a refrigerated showcase so that customers can freely pick up products by hand. That is, a normal paper box in which a locking piece is provided on one flap of the upper flap and the lower flap without using an adhesive, and the both ends of the box body are closed by inserting and locking the locking piece on the other flap. Is used as a container for storing frozen food, there is a problem that tampering such as pulling out the locking piece from the slit or the long hole and inserting the locking piece back again, or unauthorized opening cannot be prevented.

As a paper box having a structure in which it is difficult to pull out the locking pieces other than the regular opening procedure so as to leave an opening trace, for example, as shown in JP-A-2005-008262, a locking piece is used. A contrivance has been proposed in which the folded portion is folded in two and locked to the inner surface of the box. However, since this technology prevents unauthorized opening of the box opening / closing lid, if this structure is simply used for a structural part that closes the end of the box body, a legitimate product buyer mistakenly removes the box body. There is a possibility of opening the end.
For this reason, the current situation is that rationalization without the bonding step cannot be performed.

On the other hand, even if the food stored in the box is a solid food such as cooked fries or chicken nuggets that does not become liquid or fluid when heated in a microwave, seasoning liquid, gravy, oil, etc. Etc. are generated from food and are likely to accumulate on the bottom plate. In the structure in which the face plate and the flap are folded up independently on each of the four sides of the bottom plate as described above, a small hole (gap) is formed in the corner of the bottom plate, and seasoning liquid etc. from the hole to the outside of the box May flow out and must be prevented.
Therefore, the above-mentioned paper packaging box is connected in the form of a blank to each of the four sides of the bottom plate with a face material which is the side face of the box via the folding part, and extends between the end parts of the adjacent face materials. Folding flaps are connected via a folding part, and each side of the bottom plate is folded up so that each folded flap overlaps the inner surface side of the face material. So that there are no small holes directly leading to

However, as described above, the face plates that are the sides of the box are connected to the four sides of the bottom plate, and the folding flaps are connected between the adjacent face materials, and the folding flaps are connected to a pair of opposing faces. When folded so as to overlap the inner surface of each material, there are the following problems. This point will be described with reference to FIG.
In the figure, reference numeral 1 denotes a paper packaging box containing food (not shown) that has been cooked for cooking in the microwave oven. In the packaging box 1, the top plate 2, the back plate 3, the bottom plate 4, and the front plate 5 are connected via the folding portion 6, and the top plate 2 is disposed between the top plate 2 and the back plate 3. A glue margin plate 7 is connected to the side opposite to the folding portion 6 via the folding portion 6, and the glue margin plate 7 is joined to the outer surface on the upper side of the front plate 5 to form a box body.

  Both ends of the box body are closed by the following face materials. A lower flap 8 is connected to each side of the bottom plate 4 on the box body end side via a folding portion 6, and the lower flap 8 is folded up. Between the side of the back plate 3 on the side of the box body and the side of the lower flap 8 on the side of the back plate 3, the side of the front plate 5 on the side of the box body end and the side of the lower flap 8 on the front plate 5 side. Folding flaps 9 are connected to each other through the folding part 6 between the sides. In this folding flap 9, an inner flap portion 10 located on the back plate 3 side and the front plate 5 side and a small flap portion 11 located on the lower flap 8 side extend from the corner of the bottom plate 4 at an angle of 45 degrees. The inner flap portion 10 is continuous over the entire length of the folding portion on the back plate 3 or the front plate 5 side, and the small piece flap portion 11 is connected to the inner flap portion 10. A small face material continuous only to the side of the lower flap 8 on the folding origin side is used. As the lower flap 8 is raised, the folding flap 9 is folded at the folding portion 6 between the inner flap portion 10 and the small piece flap portion 11 and folded on the inner surface side of the lower flap 8. In FIG. 1, the box body end portion is shown in an open state for easy explanation.

  An upper flap 12 is connected to each side of the upper surface plate 2 on the box body end side via a fold 6, and the upper flap 12 is folded and overlapped with the lower flap 8, so that both ends of the box body The part is closed. In the illustrated example, an adhesive is used as means for overlapping the upper flap 12 with the lower flap 8 and stopping it.

As described above, since the folding flap 9 is folded when both ends of the box body of the packaging box 1 are closed, no small holes are formed at the four corners of the bottom plate 4.
However, each of the folded lower flap 8 and the folded upper flap 12 has a drag force to return to the original unfolded state, and the upper flap 12 is overlapped with the lower flap 8 and securely bonded. 2, the lower flap 8 and the upper flap 12 are both bent as shown in FIG. 2 so that the lower flap 8 and the inner flap portion 10 are separated from each other, and the box height direction is reached at the four corners of the box. There is an inconvenience that the gap A opens, and it is impossible to eliminate the possibility that minute insects are mixed into the box from the opened gap.

In this respect, if the upper flap is firmly engaged with the lower flap without bonding the adhesive, and the upper flap and the lower flap are firmly connected to each other, the upper flap and the lower flap are flexed. There may be some improvement.
However, since the small piece flap portion of the folding flap is small, the gap between the lower flap and the inner flap portion of the folding flap cannot be filled. If the small flap portion has the same height as the inner flap portion and an attempt is made to fill the gap between the lower flap and the inner flap portion of the folded flap, the face material is formed at the upper side portion of the folded folded flap. As the number of overlaps increases, the thickness increases, and a problem arises in that a hole-like gap is formed between the folding portion of the upper flap and the upper side of the lower flap.

  Therefore, in view of the above circumstances, the present invention is a box-making box that connects the upper flap and the lower flap without using an adhesive means, and prevents the gap from entering the minute insects on the box end side. It is an object of the present invention to provide a packaging box that prevents unauthorized opening and does not cause liquid leakage.

  The present invention has been made in consideration of the above problems, and the top plate, the back plate, the bottom plate, and the front plate are connected to each other through a fold portion, and the fold portion is formed on the side opposite to the fold portion of the top plate. A box body is formed by joining the adhesive margin plates connected via the outer surface of the front plate, and lower flaps are connected to the sides on the box body end side of the bottom plate via folding parts. The lower flap is folded, and the two folded flaps are connected via a folding portion between the box body end side of the back plate and the front plate and the end side of the lower flap. The bi-folded flap is folded in the middle and folded on the inner surface side of the lower flap, and the upper flap is connected to each side of the box body end side of the upper surface plate via the folded portion. It is folded down and stacked on the lower flap, closing both ends of the box body In the wrapping box, each of the two folded flaps is composed of a triangular plate on the lower flap side and a triangular plate on the inner side of the box that are connected via a folding portion at the center of the folded flap. The upper side of the triangular face plate on the inner side of the box of the two-folded flap, the upper side of the triangular face plate on the lower flap side, and the upper side of the lower flap are positioned corresponding to the folded side of the upper flap, and Make the box height dimension of each triangular face plate on at least the lower flap side of the folded flap larger than the box height dimension of the lower flap, and the upper side of each triangle face plate on the lower flap side is between the upper face plate and the upper flap. The upper flap is brought into contact with the folded portion from the edge of the folded portion along the length direction of the folded portion, and the upper flap is placed on the folded portion side of the upper flap, with the length of the folded portion as a width and downward in the box height direction. Both are extended The side has a wide part that hangs in a straight line along the fold between the lower flap and the double-folded flap, and has a locking piece to be inserted into the slit provided in the lower flap at the lower part of the upper flap. The locking piece is connected to the inner surface of the locking piece so that it can be folded at both ends via the folding portions, and the locking piece is formed by folding the claw portion on the inner surface of the locking piece. The locking piece inserted into the slit, the claw portion extending from the inner surface of the locking piece to the inner side of the box and wider than the slit length is locked to the slit so that it cannot be removed, The upper flap is tensioned in the vertical direction of the box by the locking and the contact with the folded portion of the upper side of the triangular plate on the lower flap side, and the lower flap and the double-folded flap are pushed inward by the tensioned upper flap. Due to the folding of the folded flap A folded portion assembly is formed in which ends opposite to the side are in close contact with each other, and an end on the upper side of the lower flap and an end on the side opposite to the middle folded side of the upper side of the two-fold flap are An end gathering portion is formed to gather, and both sides of the wide portion are covered in close contact with the end gathering portion, and the packaging box is provided. This solves the above problems.

  In the present invention, it is preferable that the box body is closed in such a way that micro insects cannot enter.

  In the present invention, it is preferable that the slit of the lower flap is located at the center of the lower flap.

  Further, in the present invention, the slit of the lower flap is continuous with a vertical slit that divides the upper side of the slit, and the slit is inserted when the locking piece with the claw portion folded on the locking piece inner surface is inserted. It is preferable that the upper side portion of the frame is provided so as to bend and deform toward the inside of the box.

  Further, in the present invention, there is a lid portion that is partitioned by a cut-out portion that does not penetrate the plate material from the paste margin plate to the upper surface plate, and the paste margin plate region portion of the lid portion is detachably bonded to the front plate. Thus, it is preferable that the lid is opened by cutting the cut-out portion caused by the glue margin plate area of the lid.

According to the first aspect of the present invention, the triangular face plate on the lower flap side of the double-folded flap comes into contact with the folded portion of the upper flap, and the upper flap is locked to the lower flap, so that the upper flap is in a tensioned state. The upper flap presses the lower flap and the two-folded flap against the inside of the box, and the ends of the two-folded flap are brought into close contact with each other so that they are gathered at the end of the box body in the box height direction. There are no gaps.
In addition, the wide part, which is the folding origin side of the upper flap, is in close contact with the end gathering part where the end part of the upper side of the lower flap and the end part of the upper side of the two-folded flap opposite to the middle folding side gather. Since it covers, a small hole-like gap does not occur on the end side of the upper flap folding origin. Therefore, it is possible to prevent entry of foreign matters from the outside.
Furthermore, since the upper flap is locked to the lower flap, the upper flap and the lower flap can be connected manually without using an adhesive device or the like.

  And according to invention of Claim 2, since the box body is closed so that the invasion of a minute insect is impossible, the foodstuff accommodated in the inside can be maintained hygienically.

  According to the invention of claim 3, the position of the slit can be easily understood when the locking piece is inserted.

  According to the invention of claim 4, the locking piece with the claw part folded on the inner surface of the locking piece can be easily inserted into the slit, and the box making by manual operation is simplified. Therefore, the box body end portion is more reliably closed.

  According to the invention of claim 5, it can be opened easily after cooking. Moreover, the cover part is provided over the glue margin board and the front board, and the wide cover part which does not affect the structure of a box trunk | drum edge part can be obtained.

Next, the present invention will be described in detail based on the embodiment shown in FIGS. 1 and 2 are denoted by the same reference numerals, and the description thereof is omitted.
In the packaging box 1 of the present invention, as shown in FIG. 3 to FIG. 5, the box body end side of the back plate 3 and the end side of the lower flap 8 (longitudinal length of the folding origin of the lower flap) Between the sides facing each other in the direction and the side on the back plate side, the side on the box body end side of the front plate 5 and the side on the end side of the lower flap 8 (also the length of the folding origin portion of the lower flap) Bi-folded flaps 13 are connected to each other between the opposite sides in the direction and the side of the front plate via the folding part 6. The folded flap 13 is located at the center passing through the center of the folded flap 13 from the corner of the bottom plate 4 so that it can be folded inward of the box. The double folded flap 13 connected to the back plate 3 is composed of the two triangular face plates 14 and 15 connected to each other, and the triangular face plate 14 on the lower flap 8 side and the face plate on the inner side of the box. The double-folded flap 13 that is composed of a triangular face plate 15 that is connected to the face plate 3 and that is connected to the front face plate 5 is a triangular face plate 14 on the lower flap 8 side and a triangular face that is inwardly connected to the front face plate 5. It consists of a face plate 15.

The dimensions in the box height direction of the back plate 3, the front plate 5, and the lower flap 8 connected to the folding portions 6 on the four sides of the bottom plate 4 are the same. On the other hand, in the folded flap 13, the dimension H1 in the box height direction of each triangular face plate 14 on the lower flap 8 side is made larger than the dimension H2 in the box height direction of the lower flap. That is, the triangular face plate 14 on the lower flap 8 side is larger than the inner dimension of the box body end opening in the box height direction, and the upper side of each triangular face plate 14 on the lower flap side is set to this large size. An abutting side 16 is provided over the entire area.
Further, as shown by the blank, in the double-folded flap 13 on the front plate 5 side, the dimension in the box height direction is also set to H1 for the triangular plate 15 continuous to the front plate 5, and the triangle on the front plate 5 side. An abutting side 16 is also provided over the upper side of the face plate 15.

As described above, the triangular flap 14 on the lower flap 8 side of the folded flap 13 is provided larger than the lower flap 8 (larger than the inner dimension of the box body end opening in the box height direction). Therefore, the abutting side 16 of the upper side is the length of the folded part from the folded part edge of the folded part 6 to the folded part 6 (upper edge part at the box body end part) between the upper surface plate 2 and the upper flap 12. It abuts in a biased state along the direction (FIGS. 6 and 7). In addition, the difference with the dimension H2 of the box height direction of the lower flap 8 is about 0.5 mm, and it is large in the range which does not change the shape of a box body edge part even if it contact | abuts.
In the packaging box 1 of the present invention, the back plate 3, the front plate 5, and the lower flap 8 are folded up as in the conventional example, and the bi-fold flap 13 is also overlapped with the inner surface side of the lower flap 8. It is folded inward. In this folded state, the upper side 17 of the lower flap 8 is in a lower position in the box height direction with respect to the abutting side 16 that is urged against the folding part 6 on the folding side of the upper flap 12. The abutting side 16 and the upper side 17 of the lower flap 8 at the lower position form a slanted portion 18 that is inclined in the bending direction of the folding portion 6 on the folding side of the upper flap 12 with a small step ( FIG. 7). Therefore, the inclined portion 18 is positioned corresponding to the fold origin of the upper flap 12, and the fold portion of the upper flap 12 strongly presses the inclined portion 18 to be between the inclined portion 18 and the upper flap 12 as will be described later. In addition, no hole-like gap is generated.
Note that the abutting side 16 itself is slightly deformed, the abutting side 16 is formed on each of the upper sides of the two triangular face plates, the front side folded flap 13 and the lower flap side only triangular face plate. In any of the two folded flaps 13 on the back plate side formed on the upper side, the upper side of each triangular face plate is in close contact with the portion on the folding origin side of the upper flap 12. For this reason, no abutting side is formed on the upper side of the triangular plate 15 on the inner side of the box of the double-folded flap 13 on the back plate side, but the upper side of the triangular plate is also in close contact with the folding part of the upper flap. And no hole-like gaps are formed.

The upper flap 12 is not inclined so that the side is directed toward the center from the position of each end of the folding portion 6. It has a wide portion 19 extending downward in the vertical direction.
And the both sides of the wide part 19 formed by extending the folding part at a constant width downward in the box height direction in this way are the folding parts 6 between the lower flap 8 and the two-folded flap 13. Along the edge of the inclined portion 18 which is the upper side of the folded portion 6 between the lower flap 8 and the folded flap 13 and the upper side of the triangular face plate 15 on the inner side of the box. A holding surface portion 20 is provided to cover the end portion on the opposite side to the end portion on the middle folding side.
That is, the folding part of the upper flap 12 having a constant width includes the upper side of the lower flap 8, the upper side (inclined portion 18) of the lower flap side triangular face plate 14 of the double folded flap 13, and the triangular face plate 15 on the inner side of the box. Since the upper side is covered, the pressing surface portions 20 at both end portions of the folding source reliably cover the end portion of the inclined portion 18 and the end portion of the upper side of the triangular face plate 15 on the inner side of the box.
A locking piece 22 to be inserted into a slit 21 (described later) provided at the center of the lower flap 8 is provided at the lower portion of the upper flap 12, and the upper flap 12 is engaged with the lower flap 8. Thus, since there is the slit 21 at the center, the slit 21 itself is easy to find when the locking piece 22 is inserted.

A claw portion 23 is connected to the locking piece 22 so as to be foldable on the inner surface of the locking piece via the folding portion 6 at opposite ends in a direction orthogonal to the box height direction. The locking piece 22 is inserted into the slit 21 by folding the claw portion 23 on the inner surface of the locking piece, and the claw portion 23 extends from the inner surface of the locking piece to the inside of the box body so that the slit length is increased. The locking piece 22 which is wider than the width is locked in the slit 21 so that it cannot be removed.
The slit 21 to which the locking piece 22 is locked is formed by a line-shaped cut in the width direction of the lower flap 8, and both end portions are formed as line portions that are curved upward in the box height direction. Yes. Since the end portion of the slit 21 is curved upward, the upper side portion 24 of the upper side portion 24 and the lower side portion 25 divided with the slit 21 in between is given flexibility.
Further, the upper side portion 24 is continuous with the slit 21 and the vertical slit 26 that divides the upper side portion 24 is continuous, and the insertion of the locking piece 22 with the claw portion 23 folded on the inner surface of the locking piece as described above. Each of the left and right upper side parts 24 that are divided is provided so that they can be flexed and deformed independently toward the inside of the box, and the claw part 23 is folded to increase the thickness of the locking piece 22 for easy insertion. It has been.

  As described above, the abutting side 16 located over the upper side of the triangular face plate 14 on the lower flap 8 side of the double-folded flap 13 abuts against the folding part 6 on the folding side of the upper flap 12 in a biased state, The upper flap 12 is provided so as to be tensioned in the vertical direction of the box by the locking piece 22 at the lower part of the upper flap 12 being locked to the slit 21. The upper flap 12 that is tensioned in the vertical direction of the box has a force that pushes it inward due to the resistance against the pulling force, and is folded between the lower flap 8 and the inner surface side of the lower flap 8. The two folded-back flaps 13 are pressed toward the inside of the box. By this pressing, the two triangular face plates 14 and 15 of the folded-up flap 13 are in close contact with each other, and the opposite side of the folded-up flap 13 from the folded side The folding portions 6 to be in close contact with each other form a folded portion collecting portion 27, and between the end portion of the lower flap 8 and the end portion of the back plate 3 or the end portion of the lower flap 8 and the end portion of the front plate 5. The parts are also closed without a gap (FIG. 8). Therefore, invasion of minute insects from between them is prevented.

Moreover, the wide part 19 of the folding origin in the upper flap 12 to be tensioned is in a state of being pulled downward in the box height direction. As described above, the wide part 19 includes the inclined part 18 and the box inner side triangular face plate. They are in close contact with the top side of 15 and cover them. In addition to the intimate contact of the wide portion 19, the upper flap 12 pushes the lower flap 8 and the double-folded flap 13 into the box as described above, so that the end portion of the inclined portion 18 (the lower flap) 8 is formed by assembling the end portion of the upper side of 8 and the end portion of the upper side of the triangular surface portion 14) and the upper end portion of the triangular surface plate 15 on the inner side of the box. It is covered densely with the surface part 20 (FIG. 8).
For this reason, no small holes are formed in the end gathering portion 28, and the entry of minute insects from the end gathering portion 28 can be prevented. Further, since the upper side of the lower flap 8 is in close contact with the wide portion 19 of the upper flap 12 over its entire length, the upper flap 12 and the lower flap 8 are in close contact with each other and the box body end is sealed. The micro-insects do not enter between the flaps, and the inside of the box is surely prevented.

In the packaging box 1 in which each box body end is closed by the above-described configuration, a lid 29 is provided so that the food stored in the box can be taken out. The most part of the adhesive margin plate 7 and the upper surface plate 2 connected thereto is the lid portion 29, and as shown in the drawing, the folding between the upper surface plate 2 and the rear surface plate 3 is performed. The cutout portion 30, one end of which is located on the portion 6, is extended so as to pass through the respective positions close to the folding portion 6 on the upper flap 12 side of the upper surface plate 2, and further, the upper surface plate 2 and the adhesive margin plate 7 Each of the cutout portions 30 extends obliquely with respect to the folding portion 6 between them, and is arranged so as to reach the lower end of the adhesive margin plate 7, and the space between the cutout portions 30 serves as a lid portion 29. .
The cut-out part 30 is formed of a perforation perforated at a depth not penetrating the plate material of the upper surface plate 2 and the glue margin plate 7 or a half-cut line shifted in position between the upper surface and the inner surface of the plate material.
The paste margin plate region portion 31 in the lid portion 29 is bonded to the front plate 5 via a releasable wax or the like, and the paste margin plate region 7 is peeled off from the front plate 5 while being raised. By cutting the cut portion 30 at the top plate 2 and cutting the cut portion 30 at the upper surface plate 2 while pulling up the glue margin plate region portion 31 that has been peeled up, the food contained therein can be taken out.

It is explanatory drawing which shows a prior art example in the state which opened the box body edge part. It is explanatory drawing which shows the state which the clearance gap produced in the box trunk | drum edge part in the prior art example. It is explanatory drawing which shows an example of the packaging box which concerns on this invention. It is explanatory drawing which shows an example of this invention in the state which opened the box body edge part. It is explanatory drawing which shows an example of this invention in the unfolded state of a blank. It is explanatory drawing which cuts off a part of upper flap and shows the closed box trunk | drum edge part in an example. It is explanatory drawing which shows the closed box body edge part in an example in a cross section. It is explanatory drawing which shows the edge part periphery of the upper flap in an example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Packaging box 2 ... Top plate 3 ... Back plate 4 ... Bottom plate 5 ... Front plate 6 ... Folding part 7 ... Paste board 8 ... Lower flap 9 ... Folding flap 12 ... Upper flap 13 ... Folded flap 14,15 ... Triangular plate 16 ... Abutting side 18 ... Inclined part 19 ... Wide part 20 ... Pressing surface part 21 ... Slit 22 ... Locking piece 23 ... Nail part 24 ... Upper side part of slit 26 ... Vertical slit 27 ... Folding part gathering part 28 ... end gathering part 29 ... lid part 30 ... cutting part A ... gap

Claims (5)

The top plate, the back plate, the bottom plate, and the front plate are connected via a folding portion, and the adhesive margin plate connected to the side opposite to the folding portion of the top plate via the folding portion is an outer surface of the front plate. To form a box body,
A lower flap is connected to each of the sides of the bottom plate on the box body end side via a folding portion, and the lower flap is folded up, and on the box body end side of the back plate and the front plate. A bi-fold flap is connected between each side and a side on the end side of the lower flap via a folding portion, the bi-fold flap is folded inward and folded on the inner surface side of the lower flap, and the upper surface plate An upper flap is connected to each side of the box body end side of the box through a fold, and the upper flap is folded and overlapped with the lower flap so that both ends of the box body are closed In the box,
Each of the two folded flaps is composed of two triangular face plates, a lower flap side triangular face plate and a box inner side triangular face plate that are connected via a folding portion at the center of the two folded flap,
The upper side of the triangular face plate on the inner side of the two-folded flap box, the upper side of the triangular face plate on the lower flap side, and the upper side of the lower flap are positioned corresponding to the folded side of the upper flap,
The box height dimension of each triangular face plate on at least the lower flap side of the double-folded flap is made larger than the box height dimension of the lower flap side, and the upper side of each triangular face plate on the lower flap side is between the upper face plate and the upper flap. Abutting on the fold part between the fold part edge from the fold part edge along the fold part length direction,
The upper flap is extended to the lower side of the box height direction with the length of the folded portion being the width, and both sides are along the folded portion between the lower flap and the double folded flap. It has a wide part that hangs in a straight line, and has a locking piece inserted into a slit provided in the lower flap at the lower part of the upper flap,
A claw portion is connected to the locking piece so that it can be folded on the inner surface of the locking piece via folding portions at both ends, and the locking piece formed by folding the claw portion on the inner surface of the locking piece serves as the slit. Inserted, locking pieces that are wider than the slit length by expanding the claw portion from the inner surface of the locking piece to the inner side of the box, are locked in the slit so as not to be extracted,
The upper flap is tensioned in the vertical direction of the box by the locking with respect to the slit of the locking piece and the contact with the folded portion of the upper side of the lower flap side triangular face plate, and the lower flap by the tensioned upper flap and the two-folded flap Is pushed into the inside of the box to form a folded portion assembly in which the ends opposite to the folded side of the folded flap are in close contact with each other, and the folded portion is folded in half with the edge of the upper side of the lower flap. The end of the upper side of the flap opposite to the folded side is gathered to form an end gathering part,
A packaging box, wherein both sides of the wide portion are in close contact with and cover the end assembly portion.   The packaging box according to claim 1, wherein the box body is closed in such a manner that micro insects cannot enter.   The packaging box according to claim 1 or 2, wherein the slit of the lower flap is located at the center of the lower flap.   The slit of the lower flap is continuous with a vertical slit that divides the upper side of the slit, and the upper side of the slit is inside the box when the locking piece with the claw portion folded on the inner surface of the locking piece is inserted. The packaging box according to any one of claims 1 to 3, wherein the packaging box is provided so as to be bent and deformed toward the direction.   A lid portion partitioned by a cut-out portion that does not penetrate the plate material from the paste margin plate to the upper surface plate, the paste margin plate region portion of the lid portion being detachably bonded to the front plate, The packaging box according to any one of claims 1 to 4, wherein the lid portion is opened by cutting the cut portion caused by the glue margin plate region.

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