JP2021147095A - Packaging box - Google Patents

Abstract

To provide a packaging box that makes it possible to improve the shape stability of a top part.SOLUTION: The packaging box comprises end flaps 31 and 33, which are connected to an upper portion of a width surface, and side flaps 32 and 34, which are connected to an upper portion of a length surface. The side flaps 32 and 34 include an upper surface area having a first dimension, a protruding area having a second dimension longer than the first dimension, and an engagement protrusion piece 36. The end flaps 31 and 33 include a base area 40, which overlaps the protruding area, a middle area 41, which is engaged with the engagement protrusion piece 36, a folded area 42, which is folded back to the lower side of the protruding area, a pair of cut lines extending in the length direction in the middle area 41 and the folded area 42, and a first ruled line 45 and a second ruled line 46, which extend in the width direction. The first ruled line 45 is provided on the outside of the pair of cut lines. The second ruled line 46 is provided inside the pair of cut lines and displaced with respect to the first ruled line 45, so that edges formed by the cut lines are in partial contact with each other.SELECTED DRAWING: Figure 6

Description

The present invention relates to a packaging box having a central opening on the upper surface where the contents are exposed.

The corrugated cardboard packaging box includes a square tubular body, a bottom that closes the lower opening of the body, and a top formed in the upper opening of the body, at the center of the top. Some have a central opening. The top of the packaging box described above has front and rear end flaps connected to the upper edge of the body, and the tip of the end flap is inserted into the body through the central opening and the base end. It is folded back to the part (see, for example, Patent Document 1).

Japanese Patent No. 4024183

In the conventional packaging box described above, when the body is empty, the tip of the end flap is folded back with respect to the base end due to the restoring force between the base end and the tip of the end flap. There is a problem that it returns to the state before it was used.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a packaging box capable of improving the shape stability of the top portion.

The packaging box for solving the above problems is provided with a body having a pair of width surfaces and a pair of length surfaces, an end flap connected to the upper part of the width surface, and a series to the upper part of the length surface. A first that comprises a side flap that extends along the length plane and that, when bent inward, separates its tip from the tip of the other side flap. An upper surface region having dimensions, a protruding region having a second dimension longer than the first dimension at both ends in the length direction, and a locking region provided at a position adjacent to the protruding region in the upper surface region. The end flap is provided with a proximal region that overlaps the upper side of the protruding region and an intermediate region that is connected to the proximal region and bends downward from between the upper surface regions and is locked to the locking region. And, on the tip side of the intermediate region, a folded region that is folded back to the lower side of the protruding region, a pair of cut lines extending in the length direction in the intermediate region and the folded region, and the above-mentioned with respect to the intermediate region. A first ruled line and a second ruled line extending in the width direction for defining a folded area are provided, the first ruled line is provided outside the pair of cut lines, and the second ruled line is inside the pair of cut lines. By providing the first ruled line so as to be offset from the first ruled line, the edges formed by the pair of cut lines are partially in contact with each other.

According to the above configuration, by locking the locking region and the intermediate region, the bent state of the width surface and the proximal region can be maintained. Further, by providing the cut line, the first ruled line, and the second ruled line, when the folded area is folded back through the first ruled line and the second ruled line, the edge portion formed by the cut line in the intermediate area and the folded area. By partially interfering with each other and causing friction, the folded state in the folded region can be maintained.

In the packaging box, it is preferable that the intermediate region is provided with a locked portion that protrudes in the width direction from the folded region and is locked to the locking region. According to the above configuration, the locking region can be reliably locked to the intermediate region.

In the packaging box, the intermediate region is divided in the width direction by the pair of cut lines, and a pair of outer regions located outside the pair of cut lines and an inner region located inside the pair of cut lines. The pair of outer regions are provided with the first ruled line, the inner region is provided with the second ruled line, and the pair of outer regions are bent downward from between the upper surface regions. It is preferably locked in the locking region. According to the above configuration, the outer region can be easily locked to the locking region.

In the packaging box, it is preferable that the first ruled line is located on the same plane as the folded region and the second ruled line is located on the same plane as the base end region. According to the above configuration, when the folded-back region is folded back, the distance between the edges formed by the cut lines and moving becomes longer, and the folded-back state in the folded-back region can be more reliably maintained.

In the packaging box, it is preferable that the intermediate region is provided with an auxiliary ruled line that is closer to the base end region than the first ruled line and is located outside the pair of cut lines. According to the above configuration, the auxiliary ruled line can easily bend the intermediate region to the lower side of the locking region when the folded region is folded back.

In the packaging box, the distance between the pair of cut lines is preferably wider on the distal end side than on the proximal end region side via the second ruled line. According to the above configuration, the folded state in the folded region can be more reliably maintained.

In the packaging box, it is preferable that the folded-back region extends in the width direction and includes an extending portion located below the side flap. According to the above configuration, since the extending portion and the side flap are engaged in the folded state in the folded region, the folded state in the folded region can be more reliably maintained.

According to the present invention, the shape stability of the top can be improved.

A perspective view of the packaging box as viewed from above. Top view of a blank sheet for manufacturing a packaging box. An enlarged plan view of the end flap in FIG. It is a figure in the process of assembling the packaging box, and is the perspective view which shows the state which the body part is constructed, and the side flap is bent inward. FIG. 4 is a continuation, (a) is a perspective view showing a state in which the base end region of the end flap is bent, and (b) is an enlarged view. FIG. 5 is a continuation of FIG. 5, in which FIG. 5A is a perspective view showing a state in which the folded-back region of the end flap is folded back, and FIG. 5B is an enlarged view. FIG. 6 is a continuation of FIG. 6, which is a perspective view showing a state in which the top and bottom of the packaging box are reversed and the contents are stored. A plan view of a main part which is a modification of the end flap and has a portion in which the cut line is parallel and a portion in which the cut line is not parallel. It is a modification of the end flap, and is a plan view of a main part in a state where the cut lines are not parallel to each other. It is a modification of the end flap, and is a plan view of a main part in a state where extending portions are provided on both sides in the width direction of the folded area. FIG. 10 is a perspective view of a main part showing a state in which the top of the packaging box is assembled and the top and bottom are reversed in the embodiment of FIG.

Hereinafter, the packaging box to which the present invention is applied will be described with reference to FIGS. 1 to 11.
As shown in FIG. 1, the packaging box 1 is a corrugated cardboard storage box for storing long fruits and vegetables such as green onions and udo. The long container 2 is housed in the longitudinal direction of the packaging box 1. The packaging box 1 includes a body portion 10, a bottom portion 20 that closes the lower opening of the body portion 10, and a top portion 30 that is formed in the upper opening of the body portion 10.

The body portion 10 includes end walls 11 and 13 forming a pair of opposite width surfaces and side walls 12 and 14 forming a pair of opposite length surfaces. The end walls 11 and 13 and the side walls 12 and 14 have rectangular shapes of the same size, respectively, and the widthwise dimension of the end walls 11 and 13 in the longitudinal direction is the longitudinal direction of the side walls 12 and 14. It is shorter than the dimension in the length direction.

The bottom portion 20 includes inner flaps 21 and 23 connected to the lower ends of the end walls 11 and 13, and outer flaps 22 and 24 connected to the lower ends of the side walls 12 and 14, respectively. The inner flaps 21 and 23 and the outer flaps 22 and 24 have rectangular shapes of the same size, respectively, and the widthwise dimensions of the inner flaps 21 and 23 are larger than the lengthwise dimensions of the outer flaps 22 and 24. It's getting shorter. The bottom 20 is configured such that the inner flaps 21 and 23 are bent inward and the outer flaps 22 and 24, which are butt flaps, are bent so as to be located below the inner flaps 21 and 23.

The top portion 30 includes end flaps 31 and 33 connected to the upper ends of the end walls 11 and 13, and side flaps 32 and 34 connected to the upper ends of the side walls 12 and 14, respectively. .. The end flaps 31, 33 and the side flaps 32, 34 have the same shape, respectively. The top 30 has a central opening 35 composed of end flaps 31, 33 and side flaps 32, 34. The container 2 faces the outside from the central opening 35.

The tips of the side flaps 32 and 34 are separated from each other in the central portion in the length direction in a state of being bent inward. Further, a locking projecting piece 36 as a locking region is provided in the vicinity of the end flaps 31 and 33. The base ends of the end flaps 31, 33 are bent inward and overlapped with the upper portions of the side flaps 32, 34. The tips of the end flaps 31 and 33 are folded back inside the body 10. Further, the widthwise edges of the end flaps 31 and 33 are locked by the locking projections 36 of the side flaps 32 and 34.

FIG. 2 is a blank sheet 3 of the packaging box 1. In the blank sheet 3, the end wall 11, the side wall 12, the end wall 13, and the side wall 14 are arranged in this order in the center. On the end wall 11, an inner flap 21 is continuously provided on the bottom 20 side, and an end flap 31 is continuously provided on the top 30 side. On the side wall 12, an outer flap 22 is continuously provided on the bottom 20 side, and a side flap 32 is continuously provided on the top 30 side. On the end wall 13, an inner flap 23 is continuously provided on the bottom 20 side, and an end flap 33 is continuously provided on the top 30 side. On the side wall 14, an outer flap 24 is continuously provided on the bottom 20 side, and a side flap 34 is continuously provided on the top 30 side.

The inner flaps 21 and 23 and the outer flaps 22 and 24 can be bent by the bottom side ruled lines 25 located at the lower edges of the end walls 11 and 13 and the side walls 12 and 14. The end flaps 31, 33 and the side flaps 32, 34 are bendable by the top side ruled lines 37 located at the upper edges of the end walls 11, 13 and the side walls 12, 14. The bottom side ruled line 25 and the top side ruled line 37 are composed of compression grooves that are not premised on cutting.

Further, the side wall 12 can be bent with respect to the end wall 11 by a ruled line 15a, the end wall 13 can be bent with respect to the side wall 12 by a ruled line 15b, and the side wall 14 can be bent with respect to the end wall 13. It can be bent by the ruled line 15c. A first joining piece 16 is continuously provided on the side wall 14 on the side opposite to the ruled line 15c. The first joint piece 16 can be bent with respect to the side wall 14 by a ruled line 15d. Further, in the first joint piece 16, a second joint piece 17 is continuously provided on the bottom 20 side. The second joint piece 17 can be bent with respect to the first joint piece 16 by the ruled line 15e. The ruled lines 15a to 15e are all composed of compression grooves that are not premised on cutting. When assembling the packaging box 1, the first joint piece 16 is connected to the end wall 11 by an adhesive means such as an adhesive or an adhesive tape, and the second joint piece 17 is connected to the end wall 11 by an adhesive means such as an adhesive or an adhesive tape. It is connected to the inner flap 21.

The side flaps 32 and 34 include a pair of protruding regions 38 arranged at both ends in the length direction and an upper surface region 39 located between the pair of protruding regions 38. The upper surface region 39 has a first dimension D1 as a dimension from the top side ruled line 37 to the tip. The first dimension D1 is a dimension in which the tip of one side flap is separated from the tip of the other side flap when the side flaps 32 and 34 are bent inward. Further, both ends in the length direction in the upper surface region 39, that is, positions adjacent to the protruding region 38 are provided with a pair of locking projecting pieces 36 that are regions protruding from the upper surface region 39 and serve as locking regions. ing.

The protruding region 38 has a second dimension D2 as a dimension from the top side ruled line 37 to the tip. The second dimension D2 is larger than the first dimension D1, and the protruding region 38 protrudes with respect to the tip of the upper surface region 39, and further protrudes with respect to the tip of the locking projecting piece 36. Here, the second dimension D2 is shorter than half the width of the end walls 11 and 13, and the tip of one protruding region 38 is the other protruding region in a state where the side flaps 32 and 34 are bent inward. It is a dimension that is separated from the tip of 38. Further, the portion of the protruding region 38 that protrudes from the upper surface region 39 serves as a fulcrum for bending the intermediate regions of the end flaps 31 and 33, which will be described later. The protruding region 38 has a third dimension D3 as a dimension in the length direction in the region protruding with respect to the tip of the upper surface region 39. The third dimension D3 is the same as or substantially the same as the fourth dimension D4 in the proximal region of the end flaps 31 and 33 described later.

As shown in FIG. 3, the end flaps 31 and 33 include a base end region 40, an intermediate region 41, and a folded region 42. Further, in a part of the intermediate region 41 and the folded region 42, a pair of cut lines 43 extending in the direction orthogonal to the width direction and penetrating in the thickness direction are provided. The base end region 40 is continuously provided to the end walls 11 and 13, the base end has the same width as the end walls 11 and 13, both corners on the tip side are formed by a curved line, and further toward the central portion. It is composed of gentle curves.

The intermediate region 41 extends from the central portion in the width direction on the distal end side of the proximal region 40. The width of the intermediate region 41 is narrower than the width of the proximal region 40 and narrower than the distance between the tips of the side flaps 32 and 34 when the side flaps 32 and 34 are bent inward. The intermediate region 41 is divided in the width direction by a pair of cut lines 43, and in the width direction, a pair of outer regions 41a, which are regions outside the pair of cut lines 43, and a region inside the pair of cut lines 43. The first inner region 41b is provided.

The pair of outer regions 41a are end portions on the proximal end region 40 side, and a first auxiliary ruled line 44 is provided at the end portion of the cut line 43 on the proximal end region 40 side. The first auxiliary ruled line 44 extends in the width direction, which is a direction orthogonal to the flute, and is configured by providing a notch 44a penetrating in the thickness direction at the center of the compression groove. The first auxiliary ruled line 44 is an auxiliary ruled line that bends a pair of outer regions 41a toward the body portion 10 in the assembled state of the packaging box 1. Further, the base end region 40 has a fourth dimension D4 as a dimension from the top side ruled line 37 to the first auxiliary ruled line 44. The fourth dimension D4 is the same as or substantially the same as the third dimension D3 (see FIG. 2) of the protruding region 38. That is, with the side flaps 32 and 34 bent inward and the end flaps 31 and 33 bent inward, the edge of the side adjacent to the locking projection 36 in the protruding region 38. The position substantially coincides with the position of the first auxiliary ruled line 44.

A first ruled line 45 is provided at the end of the pair of outer regions 41a on the folded region 42 side. The first inner region 41b is provided with a second ruled line 46 at the end on the folded region 42 side. The second ruled line 46 is arranged closer to the base end region 40 than the first ruled line 45 in the direction orthogonal to the width direction. The first ruled line 45 and the second ruled line 46 are composed of compression grooves that are not premised on cutting, and are parallel to the top side ruled line 37. In the assembled state of the packaging box 1, the folded area 42 is folded back toward the body portion 10 via the first ruled line 45 and the second ruled line 46.

Further, the intermediate region 41 includes a locked portion 47 that protrudes in the width direction from the folded region 42 at the edge portion in the width direction. The locked portion 47 is locked to the locking projecting pieces 36 of the side flaps 32 and 34 in the assembled state of the packaging box 1.

The folded region 42 extends from the intermediate region 41 and is narrower than the intermediate region 41. The folded region 42 is divided in the width direction by a pair of cut lines 43 on the intermediate region 41 side thereof, and includes a second inner region 42a which is an inner region of the pair of cut lines 43 in the width direction. The folded-back region 42 is an end portion on the tip end side of the second inner region 42a, and a second auxiliary ruled line 48 is provided in parallel with the second ruled line 46 at the end portion on the folded-back region 42 side of the cut line 43. The second auxiliary ruled line 48 extends in the width direction, which is a direction orthogonal to the flute, and is configured by providing a notch 48a penetrating in the thickness direction at the center of the compression groove. In the assembled state of the packaging box 1, the second inner region 42a is bent toward the outside of the body portion 10 via the second auxiliary ruled line 48. In other words, the second inner region 42a is bent in the inner direction of the body portion 10 via the second ruled line 46.

Next, a method of assembling the packaging box 1 will be described.
As shown in FIG. 4, from the state of the blank sheet 3, the first joint piece 16 and the end wall 11 are connected, and the second joint piece 17 and the inner flap 21 are connected to form the packaging box 1 into a cylindrical shape. .. Next, the side flaps 32 and 34 are bent inward via the top side ruled line 37.

Next, the end flaps 31 and 33 are folded back toward the body portion 10 to form the top portion 30 and the central opening portion 35. Since the end flaps 31 and 33 have the same configuration, this operation will be collectively described below. As shown in FIG. 5, the end flap 33 is bent inward via the top side ruled line 37, and the base end region 40 is overlapped with the upper surface of the protruding region 38 of the side flaps 32 and 34.

Next, as shown in FIG. 6, by grasping the folding area 42 toward the body portion 10, the folding area 42 is bent toward the body portion 10 side via the first ruled line 45 and the second ruled line 46, and the side. It is located on the lower surface side of the protruding region 38 in the portion flaps 32 and 34. Specifically, the pair of outer regions 41a in the intermediate region 41 are bent downward so as to form an obtuse angle with respect to the proximal region 40 via the first auxiliary ruled line 44 between the pair of upper surface regions 39. At this time, the edge portion of the protruding region 38 on the side adjacent to the locking projecting piece 36 serves as a fulcrum when the outer region 41a is bent along the first auxiliary ruled line 44. As a result, the locked portion 47, which is the edge portion in the width direction of the intermediate region 41, is positioned below the locking projecting piece 36 and is locked. Then, the folded region 42 is bent so as to form an acute angle with the outer region 41a via the first ruled line 45. Further, the second inner region 42a in the folding region 42 forms an acute angle with respect to the first inner region 41b via the second ruled line 46, and with respect to the folding region 42 via the second auxiliary ruled line 48. It is bent to make an acute angle. The first ruled line 45 is located on the same plane as the folded region 42, and the second ruled line 46 is located on the same plane as the base end region 40.

At this time, the inner edges of the pair of outer regions 41a in the width direction and the edges of both ends of the second inner region 42a in the width direction are partially rubbed and interfere with each other. Here, in each cut line 43, interference between the edges occurs at one place. As a result, the restoring force between the base end region 40 and the folded region 42 is relaxed, it becomes difficult for the folded region 42 to return to the state before it is folded, and the central opening 35 is less likely to collapse. Further, in the folding operation of the end flaps 31 and 33 shown in FIGS. 5 and 6, the end flaps 31 and 33 are bent inward via the top side ruled line 37, and the folded area 42 is directly set on the body 10 side. It can be performed as a series of operations by grasping it.

Next, as shown in FIG. 7, the top and bottom of the packaging box 1 are reversed so that the top 30 is located on the lower side, and the container 2 such as green onions is stored from the lower opening 10a. After that, the inner flaps 21 and 23 are bent inward through the bottom side ruled line 25, and then the outer flaps 22 and 24, which are butt flaps, are bent inward through the bottom side ruled line 25 to form the bottom 20. do. Then, the outer flaps 22 and 24 are sealed by an adhesive means such as an adhesive or an adhesive tape, and the top and bottom of the packaging box 1 are reversed again so that the top 30 is located on the upper side, thereby transporting as shown in FIG. It becomes a state. The packaging box 1 can be carried so that the worker holds the bottom 20 in the transport state. Further, the operator can carry the intermediate region 41 and the folded region 42 in the central opening 35 with one hand so as to hold them in his / her hand.

According to the packaging box 1 as described above, the effects listed below can be obtained.
(1) By locking the folded end flaps 31, 33 with the locking projections 36 provided on the side flaps 32, 34, the folded shape of the top formed around the central opening 35 can be formed. Can be maintained.

(2) By providing the pair of cut lines 43, the first ruled line 45, and the second ruled line 46, when the folded area 42 is folded back through the first ruled line 45 and the second ruled line 46, the pair of outer regions 41a The inner edge portion in the width direction and the edge portions on both sides in the width direction in the second inner region 42a partially interfere with each other to cause friction, so that the folded state of the folded region 42 can be maintained.

(3) Since the intermediate region 41 is provided with the locked portion 47 at the edge portion in the width direction, the intermediate region 41 can be more reliably locked by the locking projection piece 36.
(4) Since the outer region 41a is bent downward from between the pair of upper surface regions 39, the outer region 41a can be easily locked to the locking projection piece 36.

(5) The first ruled line 45 is located on the same plane as the folded area 42, and the second ruled line 46 is located on the same plane as the base end area 40. The distance between the inner edge portion in the width direction and the width direction edge portion of the second inner region 42a in the width direction becomes longer, and the folded state of the folded region 42 can be more reliably maintained.

(6) By providing the first auxiliary ruled line 44, the outer region 41a of the intermediate region 41 can be easily bent to the lower side of the locking projection piece 36, which can improve workability. In addition, bending at an unintended position in the intermediate region 41 can be suppressed.

The above embodiment can be modified as appropriate and implemented as follows.
The pair of cut lines 43 in the end flaps 31 and 33 may be configured such that the interval in the width direction is wider on the tip side via the second ruled line 46 than on the base end region 40 side. For example, as shown in FIG. 8, the pair of cut lines 43 includes a pair of first straight lines 43a extending in a direction orthogonal to the width direction between the first auxiliary ruled line 44 and the second ruled line 46, and a first straight line 43a. It includes a pair of second straight lines 43b extending diagonally outward in the width direction from the two ruled lines 46 to the second auxiliary ruled line 48. That is, the width of the pair of cut lines 43 is wider on the second straight line 43b on the tip side via the second ruled line 46 than on the first straight line 43a on the base end region 40 side via the second ruled line 46. It is configured so that the distance between the directions is wide.

As a result, when the packaging box 1 is assembled, the amount of interference between the inner edge portion in the width direction in the pair of outer regions 41a and the edge portions at both ends in the width direction of the second inner region 42a becomes large. The frictional force is increased, and the folded state of the folded region 42 can be maintained more reliably.

The pair of cut lines 43 may be a straight line extending diagonally outward in the width direction from the first auxiliary ruled line 44 to the second auxiliary ruled line 48 as the second straight line 43b.
The first straight line 43a may be a straight line extending from the first auxiliary ruled line 44 to a position closer to the tip side than the second ruled line 46, or from the first auxiliary ruled line 44 to the base end region than the second ruled line 46. It may be a straight line extending to the position on the 40 side.

As another modification of the pair of cut lines 43, for example, as shown in FIG. 9, the pair of cut lines 43 extend from the first auxiliary ruled line 44 toward the tip side so that the distance in the width direction becomes narrower. It includes a pair of existing third straight lines 43c. Further, a pair of fourth straight lines 43d extending from the tip end side of the third straight line 43c toward the tip end side so as to widen the interval in the width direction, and a fourth straight line 43d from the tip end side end of the fourth straight line 43d. 2. A pair of fifth straight lines 43e extending so as to narrow the interval in the width direction toward the tip end side up to the auxiliary ruled line 48 are provided. At this time, the first ruled line 45 and the second ruled line 46 are located between the pair of fourth straight lines 43d. Also in this embodiment, the distance between the pair of cut lines 43 is wider on the distal end side than on the proximal end region 40 side via the second ruled line 46. Further, in the assembled state of the packaging box 1, the inner edge portion in the width direction in the pair of outer regions 41a and the width direction in the second inner region 42a are larger than those in the case of the embodiment shown in FIGS. 3 and 8. The frictional force is further increased by increasing the amount of interference with the edges at both ends. As a result, the folded state of the folded area 42 can be more reliably maintained.

-In the case of the embodiment shown in FIG. 9, the third straight line 43c may not be provided. That is, a pair of fourth straight lines 43d may extend from the first auxiliary ruled line 44 to the end of the fifth straight line 43e on the base end region 40 side. Further, the fifth straight line 43e may not be provided. That is, the fourth straight line 43d may extend from the tip end side of the third straight line 43c to the second auxiliary ruled line 48.

The pair of cut lines 43 may not be formed of a straight line, but may be formed of a wavy line shape or a curved shape in which the cuts gradually widen. Further, it may be formed in a sawtooth shape or a zigzag shape.

As shown in FIG. 10, the folding region 42 may include a pair of extending portions 49 extending from both ends in the width direction thereof. The extending portions 49 extend from both ends in the width direction of the folding region 42, and the width of the pair of extending portions 49 via the folding region 42 has the same width as the base end region 40. Further, the extension portion 49 can be bent with respect to the folding region 42 via the extension portion ruled line 50. In the operation of folding back the folded area 42, the folded area 42 is gripped toward the body 10 side, so that the folded area 42 is bent toward the body 10 side via the first ruled line 45 and the second ruled line 46. At this time, the extension portion 49 interferes with the upper surface region 39 of the side flaps 32 and 34 in the central opening 35, and is bent to the opposite side to the body portion 10 via the extension portion ruled line 50, while the body portion Folded inward of 10, the folded region 42 and the extension 49 are located on the lower surface side of the protruding region 38. In this state, as shown in FIG. 11, the top and bottom of the packaging box 1 are reversed so that the extending portion 49 is parallel to the folding region 42, and then the container 2 is stored.

In the case of the embodiment shown in FIGS. 10 and 11, since the width of the pair of extending portions 49 via the folded region 42 is larger than the width of the central opening 35, the extending portions 49 and the side flaps 32 and 34 are used. By engaging with each other, the folding area 42 can be locked more reliably.

In the case of the embodiment shown in FIGS. 10 and 11, the extension portion 49 is pre-bent to the body portion 10 side or the side opposite to the body portion 10 via the extension portion ruled line 50, and then the folding area 42 is formed into the body. It may be folded back to the portion 10 side.

-In addition, a chamfer may be provided at the tip of the locked portion 47. For example, as shown in FIG. 10, an arc-shaped chamfer is provided at the tip of the locked portion 47. As a result, the amount of interference when the intermediate region 41 gets over the locking projecting piece 36 can be reduced, and it can be easily turned back. Further, the chamfer may be the C surface.

-The first auxiliary ruled line 44 and the second auxiliary ruled line 48 may be configured to provide only one of them as long as they have sufficient workability when folding back the folded area 42. Further, neither the first auxiliary ruled line 44 nor the second auxiliary ruled line 48 may be provided.

-The first auxiliary ruled line 44 and the second auxiliary ruled line 48 do not have to be provided with a notch at the center thereof.
-In the state of the blank sheet 3, the second ruled line 46 may be located closer to the tip side than the first ruled line 45. In other words, the outer region 41a does not have to bend downward in the assembled state of the packaging box 1. For example, the outer region 41a may be flush with the proximal region 40, and the first inner region 41b may be bent downward. In that case, the base end region 40 and the outer region 41a are bent so as to form an acute angle with respect to the end walls 11 and 13, and are locked to the locking projecting piece 36.

In the assembled state of the packaging box 1, either the first ruled line 45 is located on the same plane as the folded area 42 or the second ruled line 46 is located on the same plane as the base end region 40. It is not necessary to have one of the configurations. For example, in the first inner region 41b, an auxiliary ruled line is further provided at the end of the boundary with the proximal region 40 and opposite to the second ruled line 46, and the first inner region 41b is relative to the proximal region 40. It may be configured to bend downward. Further, it is not necessary to have either a configuration in which the first ruled line 45 is located on the same plane as the folded region 42 and a configuration in which the second ruled line 46 is located on the same plane as the base end region 40.

If there is no problem in the workability of folding back the folded area 42 and the locking of the locked portion 47 and the locking projecting piece 36, the locked portion 47 may not be provided. That is, the intermediate region 41 and the folded region 42 may have the same width.

The shapes of the locking projecting piece 36 and the locked portion 47 as the locking region are not limited.
The end flaps 31 and 33 do not have to have the same shape. For example, the extension portion 49 may be provided only on the end flap 31.

-The protruding region 38 may be abutted against the other protruding region 38 when the side flaps 32 and 34 are bent inward, or may be overlapped with each other.
-The contents 2 to be stored in the packaging box 1 are not particularly limited to long ones and are not limited to fruits and vegetables unless they are of a size that allows them to fall from the central opening 35. ..

-The container 2 to be stored in the packaging box 1 does not have to be stored in the longitudinal direction of the packaging box 1. For example, the container 2 may be stored so as to be aligned with the lateral direction of the packaging box 1.
-The material of the packaging box 1 is not limited to corrugated cardboard, and may be, for example, thick paper.

1 ... Packaging box 10 ... Body 30 ... Top 31, 33 ... End flaps 32, 34 ... Side flaps 35 ... Central opening 36 ... Locking projectiles 38 ... Protruding area 39 ... Top surface area 40 ... Base end area 41 ... Intermediate area 42 ... Folded area 43 ... Cut line 44 ... First auxiliary ruled line 45 ... First ruled line 46 ... Second ruled line 47 ... Locked portion 49 ... Extended portion

Claims (7)

A body portion having a pair of width surfaces and a pair of length surfaces, an end flap connected to the upper part of the width surface, and a side flap connected to the upper part of the length surface are provided.
The side flaps extend along the length plane and have a length with a top surface region having a first dimension in which the tip is separated from the tip of the other side flap when bent inward. At both ends in the direction, a protruding region having a second dimension longer than the first dimension and a locking region provided at a position adjacent to the protruding region in the upper surface region are provided.
The end flap includes a proximal region that overlaps the upper side of the protruding region, an intermediate region that is connected to the proximal region and bends downward from between the upper surface regions and is locked to the locking region. On the tip side of the intermediate region, a folded region that is folded back to the lower side of the protruding region, a pair of cut lines extending in the length direction in the intermediate region and the folded region, and the folded region with respect to the intermediate region. A first ruled line and a second ruled line extending in the width direction for defining are provided, the first ruled line is provided outside the pair of cut lines, and the second ruled line is inside the pair of cut lines. A packaging box characterized in that the edges formed by the pair of cut lines are partially in contact with each other by being provided so as to be offset from one ruled line. The packaging box according to claim 1, wherein the intermediate region projects in the width direction from the folded region and includes a locked portion that is locked to the locking region. The intermediate region is divided in the width direction by the pair of cut lines.
A pair of outer regions located outside the pair of cut lines,
With an inner region located inside the pair of cut lines
The first ruled line is provided in the pair of outer regions.
The second ruled line is provided in the inner region, and the second ruled line is provided.
The packaging box according to claim 1 or 2, wherein the pair of outer regions bend downward from between the upper surface regions and are locked in the locking region. The first ruled line is located on the same plane as the folded area.
The packaging box according to any one of claims 1 to 3, wherein the second ruled line is located on the same plane as the base end region. Any of claims 1 to 4, wherein the intermediate region includes an auxiliary ruled line located on the base end region side of the first ruled line and outside the pair of cut lines. The packaging box according to item 1. The packaging according to any one of claims 1 to 5, wherein the distance between the pair of cut lines is wider on the distal end side than on the proximal end region side via the second ruled line. box. The packaging box according to any one of claims 1 to 6, wherein the folded area extends in the width direction and includes an extending portion located below the side flap.

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