JP2023146691A - packaging box - Google Patents

Abstract

To provide a packaging box that can be easily manufactured while increasing corners of a trunk part.SOLUTION: A packaging box 1 has a cylindrical trunk part 10, and a closing part 20 that closes either one of two open ends 10a of the trunk part 10. The trunk part 10 has a pair of first side plates 11 facing each other, and a pair of second side plates 12 connecting the pair of first side plates 11 by being connected to the pair of first side plates 11 via a trunk part fold line (a). The closing part 20 has a pair of flaps 21 that are bent inward at a flap fold line (b1). At least one of the pair of first side plates 11 is provided with an additional fold line (c) extending in the same direction as the trunk part fold line (a). The pair of flaps 21 are configured such that a total distance from the flap fold line (b1) to a tip 21a is larger than a distance between the two trunk part fold lines (a) in the second side plate 12. The additional fold line (c) is formed by folding the pair of flaps 21 inward at the flap fold line (b1) and abutting their tips 21a against each other.SELECTED DRAWING: Figure 1

Description

The present invention relates to a packaging box for storing various articles.

Conventionally, groove-cut packaging boxes, which are made (assembled) by folding a single blank sheet with multiple grooves (slits) cut from the edge, have become popular as packaging boxes for storing various products. are doing. This grooved shape forms a cylindrical body by gluing the seam allowance provided at the end of the blank sheet where the grooves are not formed to the opposite end, and the flap formed by groove cutting By bending the body, at least one of the openings at both axial ends of the body is closed.

These grooved packaging boxes generally have a rectangular cylindrical body bent at four points, but there are also boxes with octagonal or hexagonal cylindrical bodies. (For example, see Patent Document 1). In this way, by forming the body into an octagonal cylindrical shape or the like and increasing the number of corner parts (bent parts), resistance to buckling in the axial direction can be increased.

Furthermore, by increasing the corner portions of the body, it is possible to shorten the circumference of the body while ensuring the same storage efficiency for articles. For example, by chamfering a rectangular cylindrical body to form an octagonal cylindrical shape, it is possible to reduce the dead space near the corners and shorten the circumference of the body. As a result, although the packaging box has the same storage efficiency, the area of the blank sheet is reduced, so material costs can be reduced.

JP2017-61341A

However, when the body is configured to have an octagonal cylindrical shape by increasing the number of corners, there is a problem in that it becomes difficult to form a box. Specifically, when the body has a general rectangular cylindrical shape, the four side walls of the body that face each other are maintained approximately parallel to each other. Although it is easy to maintain a straight state, increasing the number of corners increases the degree of freedom in the posture of each side wall, so it is necessary to bend each corner to an appropriate angle (an angle other than a right angle). , it was necessary to maintain that state, and manufacturing the box required time and effort.

In this regard, in the packaging box described in Patent Document 1, the shape of the body after manufacturing the box is maintained in an octagonal cylindrical shape or the like by supporting the inner flap at the side edge. However, when folding the inner flap during box manufacturing, it is necessary to hold the body in an appropriate octagonal tube shape so that the inner flap goes inside the body and the side edge touches the inner surface. It did not make it easy to open the box.

In view of these circumstances, the present invention aims to provide a packaging box that can be easily manufactured while increasing the corner portion of the body.

The packaging box of the present invention has a cylindrical body and a closing part that closes either one of two open ends of the body, and the body has a pair of opposite ends. and a pair of second side plates that connect the pair of first side plates by being connected to the pair of first side plates via the body fold line, and the closing part is connected to the pair of first side plates via the flap fold line. a pair of flaps connected to the first side plate and bent inward at the flap fold line, and at least one of the pair of first side plates has an additional flap extending in the same direction as the body fold line. A crease line is provided, and the pair of flaps are configured such that the total distance from the flap crease line to the tip is larger than the distance between the two body crease lines in the second side plate, and the additional crease line is characterized in that the pair of flaps is bent inward along the flap crease line and the tips of the flaps are butted against each other.

According to the packaging box of the present invention, the closure portion can be formed by folding the pair of flaps along the flap crease line while the body is formed into a stable rectangular tube shape by folding only the body crease line. When forming this closed part, by folding the pair of flaps with their tips abutted against each other, the pair of first side plates are pushed away from each other, thereby bending the additional crease line into a mountain fold. The corners of the torso can be increased. That is, according to the packaging box of the present invention, the box can be easily manufactured using substantially the same procedure as the conventional method, while increasing the corner portions of the body.

Moreover, in the packaging box of the present invention, it is preferable that the additional fold line has a portion that is not parallel to the body fold line. According to this, it is possible to easily configure the additional fold line that is less bendable than the body fold line, and to suppress the additional fold line from being inadvertently bent when the body fold line is folded.

Moreover, in the packaging box of the present invention, it is preferable that the additional fold line has a bent or curved portion. According to this, it is possible to easily configure the additional fold line that is less bendable than the body fold line, and to suppress the additional fold line from being inadvertently bent when the body fold line is folded.

Moreover, in the packaging box of the present invention, it is preferable that the additional fold line is provided along a line that is convex toward the center of the first side plate.

Conventionally, packaging boxes that have an octagonal cylindrical body by providing chamfered inclined surfaces on the four corners of the body are stacked vertically, etc., and compressive force in the axial direction is applied. However, by providing an additional fold line along a line that convexes toward the center of the first side plate, there was a problem that the side wall between the sloped surfaces was prone to buckling as if concave toward the inside. When the additional crease lines are bent, the area between the additional crease lines on the first side plate can be slightly bulged outward, and an axial tensile stress can be generated on the surface side of the area. That is, according to this configuration, it is possible to create in advance a state that is exactly opposite to the state in which the first side wall is buckled inwardly due to the compressive force in the axial direction. Buckling can be suppressed.

Moreover, in the packaging box of the present invention, it is preferable that the additional fold line has a portion located closer to the center of the first side plate than both ends of the flap fold line. According to this, it becomes possible to support the first side plate 11 so that the additional crease line is difficult to bend by the flap, so the additional crease line that is more difficult to bend than the body part crease line can be easily configured, and the body part crease line It is possible to suppress inadvertent bending of additional fold lines when folding.

Further, in the packaging box of the present invention, the flap is arranged in a region closer to the flap fold line between the additional fold line and one end of the flap fold line closer to the additional fold line than in other parts. It is preferable to have a deformable portion that is easily deformed.

According to this, even when the additional fold line has a portion located closer to the center of the first side plate than both ends of the flap fold line, it is possible to facilitate the bending of the additional fold line as the flap is folded. Therefore, box manufacturing can be facilitated. Moreover, since it becomes possible to deform the flap into an appropriate shape according to the bending of the additional fold line, the final shape of the packaging box can be stabilized.

Moreover, in the packaging box of the present invention, it is preferable that the additional fold line is constituted by a half-cut line provided on the back surface of the first side plate. According to this, it is possible to appropriately adjust the difficulty of bending the additional crease line and suppress the inadvertent bending of the additional crease line when folding the body crease line. can be facilitated.

According to the packaging box of the present invention, an excellent effect can be achieved in that the box can be easily manufactured while increasing the corner portion of the body.

FIG. 1 is a schematic perspective view of a packaging box according to an embodiment of the present invention. It is a developed view of a packaging box. A to C are schematic perspective views showing a procedure for manufacturing a packaging box. A to C are schematic perspective views showing a procedure for manufacturing a packaging box. A to C are schematic diagrams showing modified examples of the packaging box. A to C are schematic diagrams showing modified examples of the packaging box. It is a schematic diagram showing a modification of a packaging box. A and B are schematic diagrams showing modified examples of the packaging box.

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic perspective view of a packaging box 1 according to an embodiment of the present invention, and FIG. 2 is a developed view of the packaging box 1, showing the surface of a blank sheet 1x of the packaging box 1 before being made into a box. ing.

The packaging box 1 of this embodiment is of a grooved type, also called type A, and is made of double-sided corrugated cardboard consisting of a front liner, a back liner, and a core. The packaging box 1 is manufactured (assembled) into a box shape by folding a flat blank sheet 1x formed by cutting grooves and adding lines to double-sided corrugated cardboard.

As shown in FIG. 1, the packaging box 1 includes an octagonal cylindrical body 10 and two closing parts 20 that close two open ends 10a at both ends of the body 10 in the axial direction (vertical direction in FIG. 1). It is composed of and. In this embodiment, since the axial direction of the body 10 is the vertical direction, the two closing parts 20 constitute the top plate 1a and the bottom plate 1b of the packaging box 1, respectively.

The body portion 10 includes a pair of first side plates 11 facing each other and a pair of second side plates 12 facing each other. Therefore, the pair of second side plates 12 connect the pair of first side plates 11 at both ends in the circumferential direction, and the pair of first side plates 11 connect the pair of second side plates 12 at both ends in the circumferential direction. The first side plate 11 and the second side plate 12 are each formed into a rectangular plate shape with different dimensions in the circumferential direction of the body 10, and in this embodiment, the one with the longer circumferential dimension is the first side plate 11. .

The body 10 is configured in an octagonal cylindrical shape by providing two additional corners 14 on each of the two first side plates 11 in addition to the four corners 13 between the first side plate 11 and the second side plate 12. ing. Therefore, in the packaging box 1 after being manufactured, the second side plate 12 has a substantially flat plate shape, whereas the first side plate 11 is bent at two places.

Further, in the present embodiment, the additional corner portion 14 is formed along a dogleg-shaped (V-shaped) line in which the intermediate portion is bent so as to be convex toward the center side of the first side plate 11. There is. As a result, in the first side plate 11, the region between the two additional corner portions 14 is slightly bulged outward, and the region between the corner portion 13 and the additional corner portion 14 is slightly recessed inward.

The closing portion 20 is composed of a pair of first flaps 21 (flaps of the present invention) and a pair of second flaps 22 stacked on the inside of the pair of first flaps 21. The first flap 21 and the second flap 22 are each formed into a rectangular plate shape with different dimensions in the circumferential direction of the trunk 10. In this embodiment, the one with the longer circumferential dimension is the so-called outer flap, and the shorter one is the so-called so-called outer flap. It has an inner flap.

The closing portion 20 is configured such that the entire open end 10a is closed by closing the pair of first flaps 21 with their tips 21a in contact with each other. Further, the closing portion 20 is formed into an octagonal shape corresponding to the shape of the body portion 10 by deforming the easily deformable portions 21b provided at both circumferential end portions on the base end side of the first flap 21 so as to collapse as appropriate. It has an external shape.

As shown in FIG. 2, in the blank sheet 1x, the first side plates 11 and the second side plates 12 are arranged alternately in the X direction (the left-right direction in FIG. 2), which is the circumferential direction of the body portion 10. In this embodiment, the first side plate 11 and the second side plate 12 are arranged in this order from the left side in FIG. A joint allowance 15 is arranged on the left side of the side plate 11. This joint allowance 15 is for forming the cylindrical body portion 10 by bonding to the second side plate 12 located on the rightmost side.

The first flaps 21 are arranged on both sides (upper and lower sides in FIG. 2) of the first side plate 11 in the Y direction (vertical direction in FIG. 2) perpendicular to the X direction in the blank sheet 1x. Further, the second flaps 22 are arranged on both sides of the second side plate 12 in the Y direction in the blank sheet 1x. Therefore, a pair of first flaps 21 and a pair of second flaps 22 constituting the closing portion 20 are arranged on both sides of the blank sheet 1x in the y direction.

Adjacent first side plates 11, second side plates 12, and joint allowances 15 are connected to each other via trunk crease line a. Further, the first flap 21 is connected to the first side plate 11 via the first flap fold line b1, and the second flap 22 is connected to the second side plate 12 via the second flap fold line b2. The first flap 21 and the second flap 22 are also divided in the X direction by slit-shaped grooves 23 cut so as to extend in the y direction from three locations on both ends of the blank sheet 1x in the y direction.

In other words, the first side plate 11, the second side plate 12, the seam allowance 15, the first flap 21, and the second flap 22 are arranged along the trunk crease line a, the first flap crease line b1, and the second It is defined by the flap crease line b2 and the groove 23.

The body crease line a forms the corner portion 13 by being bent during box manufacturing. The trunk fold line a is provided on a straight line extending in the Y direction so as to connect the inner ends of the grooves 23 adjacent in the Y direction.

The first flap crease line b1 and the second flap crease line b2 are for forming the closure part 20 by folding the first flap 21 and the second flap 22 during box manufacturing. The first flap crease line b1 and the second flap crease line b2 are provided on a straight line extending in the X direction so as to connect the inner ends of the grooves 23 adjacent in the X direction.

In this embodiment, the first flap crease line b1 and the second flap crease line b2 are provided on the same straight line on each side in the Y direction, but considering the thickness of the material at the time of overlapping, Both may be provided offset in the Y direction.

In this embodiment, the body crease line a, the first flap crease line b1, and the second flap crease line b2 are formed on the back surface of the blank sheet 1x (inside the packaging box 1), as in a general grooved packaging box. It consists of ruled lines provided on the side surface.

Two additional fold lines c are provided on the first side plate 11 near the body fold line a. This additional crease line c is for forming the additional corner 14, and is provided so as to extend in the Y direction, that is, in the same direction as the trunk crease line a. Moreover, both ends of the additional fold line c are connected to the first flap fold line b1, respectively.

In this embodiment, the additional fold line c is formed along a dogleg-shaped (V-shaped) line in which the intermediate portion is bent so as to be convex toward the center of the first side plate 11 . Therefore, the additional fold line c of this embodiment has a portion that is not parallel to the trunk fold line a, and also has a bent portion.

In this way, by providing the additional fold line c with a portion that is not parallel to the body fold line a, or by providing a bent or curved portion, the additional fold line c can be configured to be more difficult to bend than the body fold line a. can. Although the details will be described later, by configuring the additional crease line c to be more difficult to bend than the body crease line a, additional crease line c is prevented from being inadvertently bent when the body crease line a is folded during box manufacturing. Since it becomes possible to prevent this, box manufacturing can be facilitated.

Furthermore, in this embodiment, the additional fold line c is provided closer to the center of the first side plate 11 than both ends of the first flap fold line b1, thereby making it more difficult to bend. By providing the additional crease line c in this manner, the range of connection between the first side plate 11 and the first flap 21 (range in the X direction) can be made into a range that straddles the additional crease line c. This makes it possible to support both sides of the first side plate 11 across the additional fold line c (both sides in the X direction) by the first flap 21 which does not have a fold line. It can be made difficult to bend.

However, if the difficulty in bending the additional crease line c becomes excessive, it becomes difficult to form the additional corner portion 14 by bending the additional crease line c. Therefore, in this embodiment, the difficulty of bending the additional crease line c is appropriately reduced by configuring the additional crease line c from a half-cut line (a cut line that does not penetrate the material in the thickness direction) provided on the back surface of the blank sheet 1x. This makes it possible to achieve both difficulty in bending when bending the trunk crease line a and ease in bending when forming the additional corner portion 14. Specifically, in this embodiment, the additional crease line c is formed from a perforation-like half-cut line in which cuts that penetrate only the back liner of the corrugated board are provided intermittently. The appearance of the packaging box 1 can be prevented from being impaired by forming the additional fold line c from a half-cut line provided on the back surface to prevent cuts, grooves, etc. from occurring on the surface.

The first flap 21 is provided with two auxiliary fold lines d on the side of the first flap fold line b1. This auxiliary fold line d is for forming an easily deformable portion 21b between itself and the first flap fold line b1. The auxiliary crease line d is provided along a line extending from one end of the additional crease line c toward the side edge 21c closer to the additional crease line c so as to be gradually separated from the first flap crease line b1. .

As a result of arranging the auxiliary crease line d close to the first flap crease line b1 in this manner, the portion sandwiched between the two becomes a region that is more easily deformed than other portions. That is, the triangular portion between the auxiliary crease line d and the first flap crease line b1 serves as the easily deformable portion 21b.

In addition, in this embodiment, the auxiliary crease line d is composed of a pressed ruled line provided on the back surface of the blank sheet 1x (the surface that becomes the inner surface of the packaging box 1), but for example, it is continuous from the additional crease line c. The auxiliary crease line d may be constructed from other ruled lines such as a half-cut line. In addition, the easily deformable part 21b may be configured to be more easily deformed by, for example, providing appropriate cuts in the easily deformable part 21b or performing a step crushing process. In this case, the auxiliary fold line d may be omitted. Furthermore, depending on the material of the packaging box 1 and the shape of the body 10, the easily deformable portion 21b may be omitted.

The distance L1 from the first flap crease line b1 of the first flap 21 to the tip 21a of the first flap 21 is determined from the trunk crease line a of the second side plate 12 because the first side plate 11 is bent at the additional crease line c. It is set larger than 1/2 of the distance L2 to the trunk fold line a. In other words, the sum of the distances L1 of the pair of first flaps 21 to the tips 21a of the first flaps 21, that is, twice L1, is set larger than the distance L2.

Next, a procedure for manufacturing the packaging box 1 will be explained. 3A-C and FIGS. 4A-C are schematic perspective views showing a procedure for manufacturing the packaging box 1.

In manufacturing the packaging box 1, first, adhesive is applied to the surface of the seam allowance 15, and then the first side plate 11 and the second side plate 12 at both ends in the X direction are bent along the body crease line a, and the seam allowance 15 is It is adhered to the back surface of the side plate 12 to form a cylindrical body 1y that is folded into two layers, as shown in FIG. 3A. Typically, this operation, along with printing, creasing, grooving, etc., is performed by machine. The subsequent work may be done manually or by machine.

Next, the cylindrical body 1y in the folded state is opened so that the first side plate 11 is separated from the cylindrical body 1y, and the four body crease lines a are bent at approximately right angles, as shown in FIG. 3B. A rectangular cylindrical body portion 10 having four corner portions 13 is formed. As mentioned above, the additional crease line c is configured to be more difficult to bend than the body crease line a, so it is easy to fold only the body crease line a at a substantially right angle without requiring any special procedure. can be maintained in the same state.

Next, the closing portion 20 constituting the bottom plate 1b is formed. In forming the closing portion 20, first, the pair of second flaps 22 on the bottom plate 1b side are bent inward along the second flap crease line b2, so that the second flap crease line b2 is bent at a substantially right angle. Next, the pair of first flaps 21 on the bottom plate 1b side are bent inward at the second flap fold line b2, and as shown in FIG. 3C, the tips 21a are butted against each other (abutted).

Then, with the tips 21a butted together (in contact), the pair of first flaps 21 is bent until the first flap crease line b1 becomes approximately a right angle, and the first flaps 21 are attached using adhesive tape or adhesive. etc. (not shown) to the trunk 10 or the second flap 22. Thereby, the closing portion 20 that constitutes the bottom plate 1b is formed.

In addition, by bending the pair of first flaps 21 with the tips 21a abutted against each other until the first flap crease line b1 becomes approximately a right angle, as shown in FIG. 4A, the pair of first flaps 21 The bottom plate 1b sides of the pair of first side plates 11 are pushed in the direction away from each other. Since the pair of first side plates 11 are connected at both ends in the circumferential direction by the second side plates 12, about half of the additional crease line c on the bottom plate 1b side is bent into a mountain fold and the additional corner portion 14 is formed. While being partially formed, the easily deformable portion 21b is collapsed so as to be folded into an S-shape, and the outer shape of the bottom plate 1b becomes an octagonal shape. As described above, the additional crease line c is composed of a half-cut line, so that when the first side plate 11 is pushed by bending the first flap 21, it is smoothly bent. Note that by bending the bottom plate 1b side of the additional fold line c, the bottom plate 1b sides of the pair of second side plates 12 are drawn toward each other.

By forming the closing portion 20 constituting the bottom plate 1b, the cylindrical body 1y becomes an open box body 1z capable of accommodating contents (not shown). Once the contents have been accommodated in the open box body 1z, the closing portion 20 constituting the top plate 1a is formed in the same manner as the closing portion 20 constituting the bottom plate 1b.

That is, as shown in FIG. 4B, after folding the pair of second flaps 22 on the top plate 1a side along the second flap fold line b2, the pair of first flaps 21 on the top plate 1a side are folded along the first flap fold line b2. Bend it at b1 and butt the ends 21a together. Then, the pair of first flaps 21 are bent as they are until the first flap crease line b1 becomes approximately a right angle, and fixed to the trunk 10 or the second flap 22.

Thereby, the closing portion 20 that constitutes the top plate 1a is formed. Further, the top plate 1a sides of the pair of first side plates 11 are pushed in the direction away from each other, and the unbent portion of the top plate 1a side of the additional fold line c is bent into a mountain fold, and the pair of second side plates 12 top plate 1a sides are attracted to each other. As a result, additional corner portions 14 are formed entirely, and an octagonal cylindrical body portion 10 is formed. Further, the easily deformable portion 21b is collapsed so as to be folded into an S-shape, and the outer shape of the top plate 1a becomes an octagonal shape. As a result, the packaging box 1 is completed.

As described above, although the packaging box 1 of this embodiment has the body 10 in the shape of an octagonal tube, it can be easily assembled using substantially the same procedure as a typical grooved packaging box with a square tube-shaped body. Can be made into boxes. In particular, since the additional crease line c is bent as the closing portion 20 is formed, and the additional corner portion 14 appears, it is possible to easily form the box by both manual and mechanical methods. It has become.

By having four additional corners 14 in addition to the four corners 13, the completed packaging box 1 has higher compressive strength in the axial direction compared to a general packaging box that has only four corners 13. It is elevated. The packaging box 1 also has four additional corners 14 in addition to the four corners 13, so that while the circumference of the body 10 is shortened and material costs are reduced, only the four corners 13 are provided. It has the same volume as a typical packaging box.

Furthermore, in this embodiment, the additional fold line c forming the additional corner portion 14 is provided along a dogleg-shaped line that is bent so as to be convex toward the center of the first side plate 11. This solves the problem when the section 10 is configured in an octagonal cylindrical shape.

Specifically, packaging boxes that have an octagonal cylindrical body by providing chamfered inclined surfaces on the four corners of the body can be stacked vertically, etc. to reduce the axial compressive force. When this is applied, there is a problem in that the side walls between the inclined surfaces tend to buckle inwardly, which is particularly noticeable when the axial dimension of the body is long.

On the other hand, in this embodiment, the additional corner portion 14 is formed along the dogleg-shaped additional fold line c that is bent toward the center of the first side plate 11, thereby forming the additional corner portion 14 as shown in FIG. 4C. As shown in FIG. 2, the region between the additional corner portions 14 of the first side plate 11 is slightly bulged outward, and an axial tensile stress is generated on the surface side of the region. As a result, the stress generated within the first side plate 11 when compressive force in the axial direction is applied to the packaging box 1 can be appropriately balanced, so buckling of the first side plate 11 can be effectively prevented. It looks like this.

That is, the packaging box 1 of this embodiment can be manufactured in the same manner as a general grooved packaging box while reliably achieving the effects of having the body 10 in an octagonal cylindrical shape. There is. In particular, in this embodiment, since it can be folded separately into the bottom plate 1b side and the top plate 1a side, even the curved additional crease line c can be easily folded.

Next, a modification of the packaging box 1 will be described. 5A to C, FIGS. 6A to C, FIG. 7, and FIGS. 8A and B are schematic diagrams showing modified examples of the packaging box 1.

5A-C and FIGS. 6A-C are schematic perspective views showing modifications of the additional fold line c. The type of line along which the additional fold line c follows is not particularly limited, and various straight lines, curved lines, and combinations thereof can be employed. The additional fold line c may be along an arcuate curved line, for example, as shown in FIG. 5A, or may be a combination of a straight line parallel to the trunk fold line a and a straight line (or curved line) that is not parallel It may also be along the same line.

Further, it is preferable that the additional crease line c has a portion that is not parallel to the body crease line a, or a bent or curved portion, making it more difficult to bend than the body crease line a, but as shown in FIG. 5C, , may be a straight line parallel to the trunk fold line a. Also in this case, for example, by providing the additional fold line c closer to the center of the first side plate 11 than both ends of the first flap fold line b1, it is possible to make the additional fold line c more difficult to bend than the trunk fold line a. Further, when the axial dimension of the body portion 10 is relatively short, buckling of the first side plate 11 is less likely to occur.

Although not shown, the additional crease line c is a half-cut line on a wave provided along a predetermined curve or straight line, or an arc-shaped cut disposed intermittently along a predetermined curve or straight line. It may also be composed of the following. Further, the additional crease line c may be provided along a straight line that is not parallel to the trunk crease line a. Further, the additional crease line c may be composed of a pressed ruled line, or may be composed of a complete cut line if the appearance is not a problem.

Further, the number and arrangement of the additional fold lines c are not particularly limited, and any number and arrangement can be adopted. For example, as shown in FIG. 6A, one additional fold line c may be provided in each of the pair of first side plates 11, and the body portion 10 may be configured in a hexagonal cylindrical shape. Further, as shown in FIG. 6B, the additional crease line c may be provided only on one of the pair of first side plates 11.

Further, as shown in FIG. 6C, the additional fold line c may have an end on the bottom plate 1b side (or the top plate 1a side) connected to the trunk fold line a. In this case, only the sum of the distances L1 between the pair of first flaps 21 on the top plate 1a side (or on the top plate 1a side) may be made larger than L2. Although not shown, in the case where an additional crease line c is provided where the end of the bottom plate 1b side (or top plate 1a side) connects to the first flap fold line b1, the top plate 1a side (or bottom plate 1b side) Only the sum of the distances L1 between the pair of first flaps 21 may be made larger than L2.

In addition, although not shown, the first side plate 11 provided with the additional fold line c may have a circumferential dimension shorter than the second side plate 12. Further, the first flaps 21 may be so-called inner flaps, or the distance L1 between the pair of first flaps 21 may be different. Further, the second flap 22 may be omitted. Moreover, the packaging box 1 may have only the bottom plate 1b.

7 and FIGS. 8A and 8B show an example of a case where the packaging box 1 can be manufactured without using adhesive tape, adhesive, or the like. Note that FIG. 7 is a developed view of the packaging box 1 of this example, and shows the surface of the blank sheet 1x of the packaging box 1 before being made into a box. Moreover, FIG. 8A is a schematic diagram showing the top plate 1a of the packaging box 1, and FIG. 8B is a schematic diagram showing the bottom plate 1b of the packaging box 1.

The packaging box 1 of this example is for storing agricultural products such as vegetables, and is configured so that it can be easily manufactured by hand even in a field or a warehouse. As shown in FIG. 7, in this example, a substantially L-shaped insertion opening 21d is provided in the first flap 21, and an insertion piece 22a inserted into the insertion opening 21d is inserted into the second flap 22. It is set up.

Two insertion ports 21d are provided in each first flap 21, and are opened by bending a swinging piece 21e formed by a full cut line along a swinging crease line e and swinging it inward. is configured to do so. Further, the swinging piece 21e is provided with an orthogonal fold line f that is substantially orthogonal to the swinging fold line e, and by bending the swinging piece 21e along this orthogonal fold line f, the swinging piece 21e is swung. It is possible to make it easier.

The insertion pieces 22a are provided on both sides of the tip of the second flap 22 in the X direction, and have a trapezoidal outer shape with a narrower tip end. A holding piece 22b having a trapezoidal outer shape with a narrow tip end is provided between the two insertion pieces 22a, and a holding piece 22b is provided at the base end of the holding piece 22b so as to extend the side end of the holding piece 22b. A holding slit 22c is provided which is made up of all cut lines.

Further, a tilting crease line g that is substantially parallel to the second flap crease line b2 is provided at a substantially intermediate position of the second flap 22 in the Y direction. This inclination fold line g is for inclining the distal end side of the second flap 22 to make it easier to insert the insertion piece 22a into the insertion opening 21d.

In addition, in this example, by configuring the rear end side portion of the groove 23 on the bottom plate 1b side into a triangular shape whose width gradually increases toward the rear end, both ends of the first flap crease line b1 on the bottom plate 1b side are formed. Alternatively, one end is located closer to the center of the first side plate 11 than the end of the additional fold line c on the bottom plate 1b side.

By doing so, it is possible to eliminate the easily deformable portion 21b that deforms in a relatively complicated manner, and to facilitate the bending of the additional crease line c when forming the closing portion 20 constituting the bottom plate 1b. Moreover, the shape of the bottom plate 1b can be stabilized.

In this case as well, since the first side plate 11 is supported by the first flap 21 on the top plate 1a side, the additional fold line c is prevented from being bent carelessly. In this example, since the additional fold line c has a portion located closer to the center of the first side plate 11 than both ends of the first flap fold line b1 on the bottom plate 1b side, the first flap on the bottom plate 1b side 21 also prevents unnecessary bending of the additional crease line c.

Further, in this example, an oblong hand hole 16 is provided in the second side plate 12, and an oblong or circular ventilation hole 24 is provided in the first flap 21 and the second flap 22. . Further, in this example, the seam allowance 15 is extended in the Y direction so as to be bonded to the second flap 22, and the area where the seam allowance 15 is bonded is a stepped area CA where the step crushing process is performed. It becomes. Further, in this example, a finger rest 25 cut out in a U-shape or semicircle shape is provided at the tip 21a of the first flap 21 and the tip 22d of the second flap 22. This finger hook portion 25 is for facilitating the manufacturing and dismantling of the packaging box 1.

As shown in FIGS. 8A and 8B, in this example, the first flap 21 is a so-called inner flap, and the second flap 22 is a so-called outer flap. Therefore, the insertion piece 22a is inserted into the insertion opening 21d when the second flap 22 is bent after the first flap 21 is bent to form the additional corner 14. By inserting the insertion piece 22a into the insertion opening 21d, the periphery of the insertion opening 21d enters into the holding slit 22c, whereby the first flap 21 is inserted between the insertion piece 22a and the holding piece 22b. It will be pinched.

Therefore, in this example, it is possible to maintain the appropriate overlapping state of the first flap 21 and the second flap 22 without using adhesive tape, adhesive, or the like. In addition, the holding piece 22b can prevent the first flap 21 from swinging so that the tip 21a is separated from the body 10, so that the bent state of the additional corner 14 is appropriately maintained and the body 10 in an appropriate shape.

Although the embodiments of the present invention have been described above, the packaging box of the present invention is not limited to the embodiments described above, and various changes can be made without departing from the gist of the present invention. Of course. For example, the material of the packaging box 1 is not particularly limited, and may be various types of cardboard other than double-sided cardboard, cardboard, various resin cardboards, resin boards, etc. Moreover, it goes without saying that the posture of the packaging box 1 is not particularly limited.

Further, the functions and effects shown in the above-described embodiments are merely a list of the most preferred functions and effects resulting from the present invention, and the functions and effects according to the present invention are not limited thereto.

1 Packaging box 10 Body 10a Open end 11 First side plate 12 Second side plate 20 Closing part 21 First flap 21b Easily deformable part a Body crease line b1 First flap crease line c Additional crease line L1 distance L2 distance

Claims (7)

A packaging box having a cylindrical body and a closing part that closes either one of two open ends of the body,
The body includes a pair of first side plates facing each other, and a pair of second side plates that connect the pair of first side plates by being connected to the pair of first side plates via a crease line of the body. ,
The closure part has a pair of flaps that are connected to the first side plate via a flap crease line and are bent inward at the flap crease line,
At least one of the pair of first side plates is provided with an additional fold line extending in the same direction as the body fold line,
The pair of flaps are configured such that the total distance from the flap fold line to the tip is larger than the distance between the two body fold lines on the second side plate,
The packaging box is characterized in that the additional crease line is folded by folding the pair of flaps inwardly along the flap crease line and abutting their tips against each other. The packaging box according to claim 1,
The packaging box, wherein the additional fold line has a portion that is not parallel to the body fold line. The packaging box according to claim 1 or 2,
The packaging box is characterized in that the additional fold line has a bent or curved portion. In the packaging box according to any one of claims 1 to 3,
The packaging box is characterized in that the additional fold line is provided along a line that is convex toward the center of the first side plate. In the packaging box according to any one of claims 1 to 4,
The packaging box, wherein the additional fold line has a portion located closer to the center of the first side plate than both ends of the flap fold line. The packaging box according to claim 5,
The flap has an easily deformable part that is more easily deformed than other parts in a region on the flap fold line side between the additional fold line and one end of the flap fold line closer to the additional fold line. A packaging box featuring: In the packaging box according to any one of claims 2 to 6,
The packaging box is characterized in that the additional fold line is constituted by a half-cut line provided on the back surface of the first side plate.

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