JP6975026B2 - Folding packaging box - Google Patents

Description

The present invention relates to a foldable packaging box.

A foldable packaging box is known in which an outer peripheral wall provided with four side plates is expanded from a flatly folded state into a square cylinder so that one end of the outer peripheral wall can be closed by a flap.

In the packaging box disclosed in Patent Document 1, two adjacent flaps are used as a set, and a locking piece provided on one side is locked in a locking hole provided on the other side to widen the outer peripheral wall. The flaps can be closed in conjunction with each other. However, in this packaging box, the flap must be bent 180 degrees with respect to the side plate, and the locking piece must be locked in the locking hole in this state, so that the box-making property is poor.

The packaging box disclosed in Patent Document 2 includes a pair of continuous common flaps on a pair of adjacent side plates. Each common flap comprises one continuous first fold curve at the corners of a pair of side plates and two second fold curves formed at an inclination angle of 45 degrees from the same corner. A pair of sticking portions to be stuck to each other is formed. The lid made of this common flap is closed by expanding the outer peripheral wall, and is opened by flattening the outer peripheral wall. However, this packaging box has poor box-making properties because it is necessary to glue the attachment portion of the common flap.

Jitsukaisho 55-27696 Gazette Jikkensho 57-39311 Gazette

An object of the present invention is to provide a foldable packaging box that does not require flap gluing and is easy to assemble.

In one aspect of the present invention, a pair of facing first side plates and a pair of second side plates extending in a direction intersecting the first side plates and facing each other are connected to each other via a first folding curve. A tubular outer peripheral wall and a lid wall that closes one end opening of the outer peripheral wall are provided, and the lid wall is the first side plate of the pair of first side plates and the pair of second side plates. A pair of the second side plate on one side, the first side plate on the other side, and the second side plate on the other side as a set, which are connected to each other via a second folding curve intersecting the first folding curve. The pair of common flaps have a common flap, and each of the pair of common flaps has a first portion continuous with the first side plate, a second portion continuous with the second side plate, and the first side plate and the said common flap continuous with each other. One mountain fold line continuous with the end of the first fold curve between the second side plates, and two continuous with the end of the first fold curve and inclined at a predetermined angle with respect to the mountain fold line. It has a pair of superimposing portions defined by a valley fold line of a book, and the pair of superimposing portions are superposed so as to be separated from each other, and are laminated on the inner surface side of the first portion or the second portion. further locking projection and locking hole to the pair of common flaps are respectively provided, the locking projections, and formed the common flap is inserted and locked into the locking holes of different said common flap Further, a foldable packaging box is provided in which each of the pair of overlapping portions is provided with an inclined edge by a V-shaped notch.

In the folded state packaging box, a pair of first side plates and a pair of second side plates are alternately connected via a first folding curve, and the first side plate and the second side plate arranged on the same plane are On one side, the remaining first side plate and the second side plate arranged on the same plane are provided with an outer peripheral wall laminated so as to face each other, and a lid wall laminated between the outer peripheral walls. Of the pair of first side plates and the pair of second side plates, the lid wall includes one of the first side plates and one of the second side plates, and the other of the first side plates and the other of the second side plates. Each has a pair of common flaps connected to each other via a second folding curve that intersects the first folding curve, and each of the pair of common flaps is continuous with the first side plate. The first part, the second part continuous with the second side plate, and the end of the first fold curve between the first side plate and the second side plate with the continuous common flap, the first fold. A pair defined by one mountain fold line located inside the curve and two valley fold lines continuous at the end of the first fold curve and inclined at a predetermined angle with respect to the mountain fold line. The pair of overlapping portions can be brought close to each other and separated from each other by bending along the mountain fold line and the valley fold line, and are laminated on the inner surface side of the first side plate and the second side plate. The pair of common flaps are further provided with a locking protrusion and a locking hole, respectively, and the locking protrusion is inserted and locked in the locking hole of the common flap different from the formed common flap. Further, each of the pair of overlapping portions is provided with an inclined edge by a V-shaped notch .

According to this foldable packaging box, it is not necessary to glue the common flaps constituting the lid wall, so that the box-making property of the packaging box can be improved. Further, the packaging box has the same structure as a general-purpose corrugated cardboard box except for the common flap, and the common flap is provided with a structure for preventing bottoming out as necessary without providing a slit between two consecutive side plates. Since it has a simple structure, it can be manufactured by flexoglua using a partial mold. As a result, the productivity of the foldable packaging box can be improved and the product cost can be reduced.

When assembling a folded packaging box, the outer peripheral wall is spread out in a square cylinder shape, and a pair of overlapping portions are overlapped. Then, the superimposing portion is bent along one of the pair of valley fold lines so that the superimposing portion overlaps the first portion or the second portion of the common flap. As a result, the opening at one end of the outer peripheral wall can be closed. In this way, it is only necessary to overlap the overlapping portions and bend them along the valley fold line, so that the assembly workability can be improved.

The common flap is provided with a locking projection and a locking hole, and the locking projection is inserted and locked in the locking hole of a common flap different from the formed common flap. According to this aspect, since one and the other of the pair of common flaps can be locked, it is possible to reliably prevent the bottom wall from coming off without using a fixing means such as an adhesive tape.

The locking hole is provided in the first portion, and the locking projection is provided in the second portion. According to this aspect, the locking projection can be easily and surely inserted into the locking hole.

The first portion of the pair of common flaps is formed with dimensions in which the tips thereof overlap each other, and at least one tip of the pair of the first portions is formed with a meshing portion that meshes with the other tip. .. According to this aspect, one and the other of the pair of common flaps can be firmly locked.

The mountain fold line extends along the second fold curve. According to this aspect, since the edge (mountain fold line) of the overlapping portion is located at the corner portion between the first portion or the second portion of the common flap and the side plate, the outer peripheral wall can be reliably held in a defined square cylinder shape. ..

In the foldable packaging box of the present invention, it can be easily assembled by simply overlapping and bending the overlapping portions. Further, since it is not necessary to glue the common flaps constituting the lid wall, it is possible to improve the box-making property of the packaging box.

The upper perspective view of the foldable packaging box which concerns on embodiment of this invention. A plan sectional view of a foldable packaging box. Bottom view of the foldable packaging box. FIG. 2A is a sectional view taken along line III-III. Top view of the blank of the foldable packaging box. Partially enlarged plan view of FIG. 4A. The perspective view of the folded state which broke the 3rd side plate and the 4th side plate. A plan sectional view of the outer peripheral wall expanded in a rectangular shape from the folded state. A plan sectional view in which the overlapping portion is superimposed. A plan sectional view in a state where a locking protrusion is inserted in the locking hole. A plan sectional view showing a modified example of a foldable packaging box.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 8 show a foldable packaging box (hereinafter referred to as “packaging box”) 10 according to the first embodiment of the present invention. As shown in FIGS. 1 to 3, the packaging box 10 has a square cylindrical outer peripheral wall 12, a bottom lid (cover wall) 18 that closes the lower opening of the outer peripheral wall 12, and an upper opening of the outer peripheral wall 12. It is provided with a canopy 33 that closes the canopy 33. The packaging box 10 of the present embodiment does not require gluing of the bottom lid 18 at the time of box making, and is easy to assemble.

(Outline of packaging box)
The packaging box 10 is made by bending and gluing a predetermined portion of one blank shown in FIG. 4A. The blank is formed by cutting a paper corrugated cardboard sheet, for example, by a general-purpose box-making machine, flexogluer. The corrugated cardboard sheet has a well-known structure in which a wavy inner ridge is arranged between the front liner and the back liner. The alternate long and short dash line in FIG. 4A is a general-purpose ruled line formed by inserting a ruled line from the back liner so as to compress the wall thickness. The solid line in FIG. 4A is a cutting line formed by inserting a blade from the back liner to the front liner, and a shape line (edge) formed by punching.

As shown in FIGS. 1 to 3, the outer peripheral wall 12 includes four side plates 13A, 13B, 14A, 14B that are continuous via a folding curve (first folding curve) 16a to 16d composed of general-purpose ruled lines. Among them, the pair of long side plates (first side plates) 13A and 13B have substantially the same rectangular shape and face each other. The pair of short side plates (second side plates) 14A and 14B have substantially the same rectangular shape having a narrower width than the long side plates 13A and 13B, and extend in a direction orthogonal to the long side plates 13A and 13B and face each other. ..

Referring to FIG. 4A, the side plates 13A to 14B are connected in the order of the long side plate 13A, the short side plate 14A, the long side plate 13B, and the short side plate 14B from the left side to the right side. At the left end of the long side plate 13A, a glue margin plate 15 is continuously provided via a folding curve 16d. The glue margin plate 15 is attached to the right end portion of the short side plate 14B with an adhesive such as a vinyl acetate emulsion. As a result, the long side plate 13A and the short side plate 14B are connected in series via the glue margin plate 15.

As shown in FIGS. 1 to 2B, the bottom lid 18 has long flaps (first part) 20A and 20B continuous with the long side plates 13A and 13B and short flaps (second part) continuous with the short side plates 14A and 14B. 21A and 21B are provided. Referring to FIG. 4A, one long flap 20A and one short flap 21A, and the other long flap 20B and the other short flap 21B are formed as one continuous common flap 19A and 19B, respectively. That is, the long side plates 13A and 13B and the short side plates 14A and 14B are divided into two sets, and the common flaps 19A and 19B that are continuous to these are formed.

The long flaps 20A and 20B and the short flaps 21A and 21B are connected to the lower edges of the corresponding side plates 13A to 14B via a folding curve (second folding curve) 22 composed of general-purpose ruled lines, respectively, and are inside from the outer peripheral wall 12. It protrudes in the direction. The folding curve 22 extends in a direction orthogonal to the folding curves 16a to 16d, which are the side edges of the side plates 13A to 14B. Referring to FIG. 4A, the four fold curves 22 extend on the same straight line. By bending the flaps 20A to 21B along the folding curve 22 with respect to the side plates 13A to 14B, the lower end opening of the outer peripheral wall 12 is closed by the bottom lid 18.

As shown in FIGS. 1 and 3, the canopy 33 includes a pair of facing inner flaps 34A, 34B and a pair of facing outer flaps 35A, 35B. The inner flaps 34A and 34B are connected to the upper edges of the short side plates 14A and 14B, and the outer flaps 35A and 35B are connected to the upper edges of the long side plates 13A and 13B via a folding curve 36 made of a general-purpose ruled line. The folding curve 36 extends in a direction orthogonal to the folding curves 16a to 16d, and extends parallel to the folding curve 22 which is the lower edge of the side plates 13A to 14B. Referring to FIG. 4A, the four fold curves 36 extend on the same straight line.

The flaps 34A to 35B of the canopy 33 project from the side plates 13A to 14B (folded curve 36) with the same dimensions. This protruding dimension is the length at which the tip edges of the pair of outer flaps 35A and 35B generally abut. As shown in FIG. 3, the inner flaps 34A and 34B are bent with respect to the short side plates 14A and 14B, and then the long flaps 20A and 20B are bent with respect to the long side plates 13A and 13B. Then, the tip of the long flaps 20A and 20B is attached with an adhesive tape, or the overlapping portion of the long flaps 20A and 20B and the short flaps 21A and 21B is fixed, so that the upper end opening of the outer peripheral wall 12 is closed by the canopy 33. NS.

(Overview of bottom lid)
As shown in FIGS. 6 to 8, the bottom lid 18 can be closed by operating the common flaps 19A and 19B in a state where the outer peripheral wall 12 is spread out in a square cylinder shape. As described above, the two common flaps 19A and 19B constituting the bottom lid 18 include long flaps 20A and 20B and short flaps 21A and 21B. Further, a pair of overlapping portions 23 are provided between the long flaps 20A and 20B and the short flaps 21A and 21B, respectively.

As shown in FIGS. 1 to 3, the long flaps 20A and 20B are formed in a substantially right-angled trapezoidal shape, and a substantially right-angled triangular overlapping portion 23 is provided on the hypotenuse thereof. Referring to FIG. 4A, the long flaps 20A and 20B including the overlapping portion 23 have a substantially rectangular shape. The short flaps 21A and 21B are formed in an isosceles triangle shape by forming an inclined edge 26, which will be described later, and a substantially right-angled triangular overlapping portion 23 is provided on the hypotenuse on the long flaps 20A and 20B sides to be integrally formed. ing. Referring to FIG. 4A, the short flaps 21A and 21B including the overlapping portion 23 have a substantially right-angled trapezoidal shape.

The pair of overlapping portions 23 are overlapped with each other so as to be detachable from each other, and are laminated on the inner surface side of the long flaps 20A and 20B. As a result, the overlapping portion 23 layer of the common flap 19A is laminated on the upper surface of one end (right side of FIG. 2A) of the long flap 20A, and on the upper surface of one end (upper side of FIG. 2A) of the short flap 21A continuous with the overlapping portion 23 layer. The long flap 20B is laminated, and the overlapping portion 23 layer of the common flap 19B is laminated on the upper surface of one end (left side of FIG. 2A) of the long flap 20B, and one end of the short flap 21B continuous with the overlapping portion 23 layer (FIG. 2A). A long flap 20A is laminated on the upper surface (lower side of 2A).

The pair of overlapping portions 23 formed on one common flap 19A, 19B is defined by one first folding curve (mountain folding line) 24 and two second folding curves (valley folding line) 25a, 25b. Has been done. One ends of the first folding curve 24 and the second folding curves 25a and 25b are continuous with the lower ends E1 and E2 of the folding curves 16a and 16c, respectively. That is, the first folding curve 24 and the second folding curves 25a and 25b are continuous at the intersections (E1 and E2) of the folding curves 16a and 16c and the folding curve 22, respectively. Here, the term “continuous” is not limited to a strictly connected configuration, but includes a substantially continuous configuration. That is, as long as the folding curves 24, 25a, 25b are configured to extend toward the intersection of the folding curves 16a, 16c and the folding curve 22, there may be a slight angle deviation, and there is a gap between the ends. You may be doing it.

The first folding curve 24 extends along the folding curve 22 which is a corner portion between the long side plates 13A and 13B and the long flaps 20A and 20B. Referring to FIGS. 4A and 4B, the first folding curve 24 is composed of a general-purpose ruled line, and the folding curve 16a between the long side plate 13A and the short side plate 14A in which the common flap 19A is continuous, and the long side plate in which the common flap 19B is continuous. Each extends linearly with respect to the folding curve 16c between the 13B and the short side plate 14B.

The second folding curves 25a and 25b extend toward the center of the bottom lid 18. Referring to FIGS. 4A and 4B, the second folding curve 25a formed on the long flaps 20A and 20B is composed of a lead ruled line in which a plurality of cutting lines are provided on a general-purpose ruled line. The second folding curve 25b formed on the short flaps 21A and 21B is composed of general-purpose ruled lines. That is, since the overlapping portion 23 is laminated on the long flaps 20A and 20B, the second folding curve 25a formed on the long flaps 20A and 20B is a lead ruled line having good bendability. The second folding curves 25a and 25b are located on both sides of the first folding curve 24 and are inclined at a predetermined angle with respect to the first folding curve 24. The inclination angle is 45 degrees in this embodiment, but it can be changed as needed.

(Packaging box making)
When the packaging box 10 is manufactured, for example, a pair of common flaps 19A and 19B are bent with respect to the side plates 13A to 14B, and the common flaps 19A and 19B are overlapped on the inner surface (back liner) side of the side plates 13A to 14B. Then, the long side plate 13A is bent with respect to the short side plate 14A, and the short side plate 14B is bent with respect to the long side plate 13B. Then, the edges of the overlapping short side plates 14B and the glue margin plate 15 are attached with an adhesive. As a result, as shown in FIG. 5, the folded packaging box 10 is manufactured. FIG. 5 is a perspective sectional view of the folded packaging box 10 in which the short side plate 13A and the long side plate 13B are broken.

As described above, in the packaging box 10 of the present embodiment, the common flaps 19A and 19B constituting the bottom lid 18 do not need to be glued, so that the box-making property can be improved. Further, the packaging box 10 has the same configuration as a general-purpose corrugated cardboard box except for the common flaps 19A and 19B, and the common flaps 19A and 19B do not have a slit between the continuous flaps 20A, 21A or 20B and 21B. It is a simple configuration that only provides a bottom-out prevention structure, which will be described later. Therefore, since the packaging box 10 can be manufactured by flexogluer using a partial mold, productivity can be improved and product cost can be reduced.

(Folded packaging box)
As shown in FIG. 5, in the folded packaging box 10, the long side plate 13A and the short side plate 14B are arranged on the same plane, and the short side plate 13A and the long side plate 13B arranged on the same plane on one side thereof. Are stacked so that they face each other. The long side plates 13A and 13B and the short side plates 14A and 14B are alternately connected to each other via the folding curves 16a to 16d.

The common flaps 19A and 19B constituting the bottom lid 18 are laminated and arranged between the outer peripheral walls 12 which are folded flat. Specifically, the common flap 19A is bent along the first folding curve 24, the long flap 20A is superposed on the long side plate 13A, the short flap 21A is superposed on the short side plate 14A, and the flaps 20A and 21A are also superposed on each other. .. The common flap 19B is also bent along the first folding curve 24, the long flap 20B is superposed on the long side plate 13B, the short flap 21B is superposed on the short side plate 14B, and the flaps 20B and 21B are also superposed on each other.

The pair of overlapping portions 23 formed on the individual common flaps 19A and 19B are overlapped with each other and superimposed on the same side plates 13A to 14B as the continuous flaps 20A to 21A. The first folding curve 24 between the pair of overlapping portions 24 is located parallel to the inside of the folding curves 16b and 16d of the outer peripheral wall 12. The second folding curves 25a and 25b are located on the inner surfaces of the side plates 13A to 14B. The inner flaps 34A and 34B project in a plane from the short side plates 14A and 14B, and the outer flaps 35A and 35B project in a plane from the long side plates 13A and 13B.

(Assembly of packaging box)
When assembling the folded packaging box 10, for example, as shown in FIG. 6, the outer peripheral wall 12 is first made into a square cylinder. Next, as shown in FIG. 7, a pair of overlapping portions 23 located diagonally are overlapped. As a result, the outer peripheral wall 12 becomes a rhombus shape, and in this state, the overlapped overlapping portion 23 layers are bent toward the long flaps 20A and 20B along the second folding curve 25a. As a result, as shown in FIG. 8, the outer peripheral wall 12 becomes rectangular due to the contact with the overlapping portion 23 layer.

Then, by laminating the overlapping portion 23 layers on the long flaps 20A and 20B, as shown in FIGS. 1 to 3, the bottom lid 18 is formed by the flaps 20A to 21B, and the bottom lid 18 forms the outer peripheral wall 12. The lower end opening is closed. As described above, the assembly work of the packaging box 10 is extremely good because only the overlapping portions 23 are overlapped and the overlapping portion 23 layer is bent along the second folding curve 25a.

(Details of bottom lid)
As shown in FIGS. 1 to 2B, in the packaging box 10 of the present embodiment, in order to improve workability at the time of assembly, the short flaps 21A and 21B are provided with inclined edges 26, and the overlapping portion 23 is provided with an inclined edge. 27 and 28 are provided. Further, in order to prevent the bottom lid 18 from coming off the bottom, the common flaps 19A and 19B are provided with a locking projection 29 and a locking hole 30, and the long flaps 20A and 20B are provided with a meshing portion 31.

(Details of inclined edge)
The inclined edge 26 of the short flap 21A suppresses the interference of the common flap 19B with the long flap 20B, and the inclined edge 26 of the short flap 21B suppresses the interference of the common flap 19A with the long flap 20A. Referring to FIG. 4A together, the inclined edge 26 is integrated from the end of the fold curve 16b between the short side plate 14A and the long side plate 13B and the end of the fold curve 16d between the short side plate 14B and the long side plate 13A. The long flaps 20A and 20B formed in the above are inclined in a direction approaching. That is, the inclined edge 26 is continuous with the ends of the folding curves 16b and 16d between the misaligned side plates 13A to 14B. The angle formed by the inclined edge 26 and the folding curve 22 is set to 45 degrees in this embodiment, but can be changed as needed.

Referring to FIGS. 1 and 2A together with FIGS. 4A and 4B, the inclined edges 27 and 28 of the overlapping portion 23 are formed by providing V-shaped notches in the common flaps 19A and 19B. This notch is formed at a symmetrical angle from the first folding curve 24 to the long flaps 20A and 20B sides and the short flaps 21A and 21B sides. As a result, the inclined edge 27 is formed at the tip corners of the long flaps 20A and 20B, and the inclined edge 28 is formed at the tip corners of the short flaps 21A and 21B. The inclination angles of the inclined edges 27 and 28 are set to 45 degrees with respect to the first folding curve 24 in the present embodiment, but can be changed as needed.

In the packaging box 10 in this way, as shown in FIG. 6, when the outer peripheral wall 12 has a square cylinder shape, the inclined edges 26 of the short flaps 21A and 21B are the outer surfaces (front surface) of the adjacent long flaps 20B and 20A. Liner) Enter the side. Therefore, as shown in FIG. 7, when the overlapping portion 23 is gripped and operated, it is possible to suppress the interference of the short flaps 21A and 21B with the long flaps 20B and 20A.

As shown in FIGS. 7 and 8, when the superimposing portion 23 layer is bent along the second folding curve 25a, the superimposing portion 23 layer is in sliding contact with the inner surfaces of the long side plates 13A and 13B. When the corners of the overlapping portion 23 layer are projected, the assembly workability is deteriorated due to the resistance due to the sliding contact with the long side plates 13A and 13B. However, since the inclined edges 27 and 28 are formed at the corners of the superimposing portion 23 of the present embodiment, the resistance between the long side plates 13A and 13B and the superimposing portion 23 can be reduced, effectively hindering the assembly work. Can be suppressed.

(Details of locking protrusions and locking holes)
The locking projection 29 is provided so as to protrude from the inclined edge 26 of the short flaps 21A and 21B, and the locking hole 30 is provided on the long flaps 20A and 20B. The locking projection 29 of the short flap 21A is inserted and locked in the locking hole 30 of the adjacent common flap 19B, and the locking projection 29 of the short flap 21B is inserted and locked in the locking hole 30 of the adjacent common flap 19A. Has been done.

As shown in FIG. 4B, the locking projection 29 comprises three types of edges 29a-29c. The edge 29a is located on the tip end side of the short flaps 21A and 21B, and intersects the inclined edge 26 at an obtuse angle of inclination α of 90 degrees or more. The edge 29b is located on the proximal end side of the short flaps 21A and 21B, and intersects the inclined edge 26 at an acute angle β of 90 degrees or less. The edge 29c connects the edges 29a and 29b, and is formed in an arc shape having a predetermined curvature.

The locking hole 30 has a cut-out structure and is defined by a fold curve 30a extending linearly, a pair of cutting lines 30b continuous at both ends of the fold curve 30a, and a cutting line 30c provided between the tips of the cutting lines 30b. Has been done. The folded curve 30a is composed of a lead ruled line in which a plurality of cutting lines are provided on a general-purpose ruled line. The total length of the folded curve 30a is longer than the distance between the edges 29a and 29b of the locking projection 29.

As shown in FIG. 6, when the bottom lid 18 is assembled, the locking projection 29 is in a state of protruding upward. As shown in FIGS. 7 and 8, the long flaps 20A and 20B are orthogonal to each other while the tips 20a are approaching each other by the rotation with respect to the long side plates 13A and 13B by the closing operation having the overlapping portion 23. Moves relatively laterally.

At this time, the locking projection 29 abuts on the locking holes 30 of the adjacent long flaps 20A and 20B due to the movement of the long flaps 20A and 20B. After that, the locking projection 29 penetrates the inside of the locking hole 30 while pushing the locking hole 30 open. As a result, as shown in FIGS. 1 to 3, the bottom lid 18 including the pair of common flaps 19A and 19B is locked.

The locking projection 29 in the locked state penetrates the locking hole 30 from the outer surface to the inner surface of the long flaps 20A and 20B. Further, the ends of the long flaps 20A and 20B through which the locking projection 29 penetrates are laminated on the short flaps 21A and 21B. Therefore, when a load is applied to the bottom lid 18 by the article housed in the packaging box 10, the locking projection 29 is sandwiched between the article and the long flaps 20A and 20B. Further, since the acute-angled edge 29b of the locking projection 29 interferes with the edge of the locking hole 30, it is possible to prevent the locking projection 29 from coming off from the locking hole 30.

In this way, since the locking projection 29 provided on one of the common flaps 19A and 19B is inserted and locked in the locking hole 30 provided on the other, one and the other of the pair of common flaps 19A and 19B are surely engaged. Can be locked. Therefore, it is possible to reliably prevent the bottom lid 18 from coming off without using a fixing means such as an adhesive tape. Further, the locking projection 29 can be easily and surely inserted into the locking hole 30 by the operation of closing the outer peripheral wall 12 with the bottom lid 18.

(Details of meshing part)
As shown in FIGS. 1 to 2B, the meshing portion 31 is provided on each of the long flaps 20A and 20B so as to be located substantially in the center of the long flaps 20A and 20B in the lateral direction (the direction in which the long side plates 13A and 13B extend). Has been done. The locking strength of the bottom lid 18 is improved by bringing the pair of meshing portions 31 into a meshed state.

Specifically, the dimension from the folding curve 22 to the tip 20a of the long flaps 20A and 20B, that is, the protruding dimension of the long flaps 20A and 20B is longer than half between the long side plates 13A and 13B, and the tips 20a overlap each other. Is formed of.

Referring to FIG. 4A together, the meshing portion 31 is formed in a trapezoidal shape extending from the center of the tips 20a of the long flaps 20A and 20B to the superimposing portion 23. The hypotenuse of the trapezoidal meshing portion 31 is formed at 45 degrees, and in the assembled state shown in FIG. 2A, the hypotenuse on the center side of the long flap 20A and the hypotenuse on the center side of the long flap 20B are located substantially linearly. It is configured as follows.

As shown in FIG. 6, when the bottom lid 18 is assembled, the pair of meshing portions 31 are in an upwardly open state. By moving the long flaps 20A and 20B by the closing operation with the overlapping portion 23, the meshing portions 31 mesh with each other. As shown in FIGS. 2A and 2B, in this locked state, the locking hole 30 side of the long flap 20A is superimposed on the upper side of the long flap 20B, and the locking hole 30 side of the long flap 20B is superimposed on the upper side of the long flap 20A. .. Therefore, in combination with the locking of the locking projection 29 and the locking hole 30, the pair of common flaps 19A and 19B can be firmly locked.

As described above, the packaging box 10 of the present embodiment can be easily assembled by simply stacking and bending the overlapping portions 23. Moreover, by locking the locking projection 29 and the locking hole 30 and / or engaging the meshing portion 31, the bottom lid 18 can be prevented from coming off and can be securely locked.

Further, since the common flaps 19A and 19B constituting the bottom lid 18 do not need to be glued, the box-making property of the packaging box 10 can be improved. Moreover, since the packaging box 10 has the same simple structure as a general-purpose corrugated cardboard box except for the common flaps 19A and 19B, it can be manufactured by flexoglua using a partial mold. Therefore, productivity can be improved and product cost can be reduced.

The foldable packaging box 10 of the present invention is not limited to the configuration of the above embodiment, and various modifications can be made.

For example, the first fold curve (mountain fold line) 24 and the second fold curve (valley fold line) 25a and 25b may be composed of two or more ruled lines that are intermittently located, or may have a curved shape as a whole. May be good.

The first fold curve (mountain fold line) 24 may be formed of a lead ruled line having a cutting line on the general-purpose ruled line, or may be formed of a half-cut line having the back liner side cut off. The second folding curve (one valley folding line) 25a may be configured by a reverse ruled line formed by inserting a ruled line from the front liner, or may be configured by a general-purpose ruled line. The second folding curve (the other valley folding line) 25b may be configured by a reverse ruled line or a lead ruled line.

The inclination angles of the second fold curve (valley fold line) 25a and 25b with respect to the first fold curve (mountain fold line) 24 may be different between the second fold curve 25a and the second fold curve 25b.

The stacked 23 layers of the superposed portion may be superposed on the inner surface side of the short flaps (second portion) 21A and 21B. Further, of the pair of 23 layers of the overlapping portion, one may be superimposed on the inner surface side of the long flap (first portion) and the other may be superimposed on the inner surface side of the short flap (second portion).

The side plates to be set as one set are the long side plate 13A and the short side plate 14B, and the long side plate 13B and the short side plate 14A, and a common flap may be connected to these. In this case, the long flap and the short flap of one of the common flaps are connected in series via the glue plate.

The locking projections 29 may be provided on the short flaps (second portion) 21A and 21B, and the locking holes 30 may be provided on the long flaps (first portion) 20A and 20B. The meshing portion 31 may be provided on only one of the pair of long flaps 20A and 20B.

The long flaps (first part) 20A and 20B of the common flaps 19A and 19B may be formed so as to have the tips 20a in contact with each other, or as shown in FIG. 9, the tips 20a are positioned at intervals. It may be formed with the desired dimensions.

The horizontal dimensions of the first side plate (long side plates 13A, 13B) and the second side plate (short side plates 14A, 14B) may be the same.

The material of the packaging box 10 is not limited to the corrugated cardboard sheet made of paper, but may be a corrugated cardboard sheet made of resin. Further, the material of the packaging box 10 is not limited to the corrugated cardboard sheet, and may be a single-layer thick paper or a resin sheet.

10 ... Packaging box 12 ... Outer wall 13A, 13B ... Long side plate (first side plate)
14A-14B ... Short side plate (second side plate)
15 ... Glue allowance plate 16a-16d ... Folded curve 18 ... Bottom lid (cover wall)
19A, 19B ... Common flap 20A, 20B ... Long flap (1st part)
20a ... Tip 21A, 21B ... Short flap (second part)
22 ... Folded curve 23 ... Overlapping part 24 ... 1st folded curve 25a, 25b ... 2nd folded curve 26 ... Inclined edge 27 ... Inclined edge 28 ... Inclined edge 29 ... Locking protrusion 29a-29c ... Edge 30 ... Locking hole 30a ... Fold curve 30b, 30c ... Cutting line 31 ... Engagement part 33 ... Canopy 34A, 34B ... Inner flap 35A, 35B ... Outer flap 36 ... Fold curve

Claims (5)

A pair of facing first side plates and a pair of second side plates extending in a direction intersecting the first side plates and facing each other are connected to each other via a first folding curve, and a square cylindrical outer peripheral wall.
A lid wall that closes one end opening of the outer peripheral wall is provided.
Of the pair of first side plates and the pair of second side plates, the lid wall includes one of the first side plates and one of the second side plates, and the other of the first side plates and the other of the second side plates. As a set, each has a pair of common flaps connected to each other via a second folding curve that intersects the first folding curve.
Each of the pair of common flaps
The first part continuous with the first side plate and
A second part continuous with the second side plate,
One mountain fold line continuous with the end of the first fold curve between the first side plate and the second side plate with the common flap continuous, and the mountain fold continuous with the end of the first fold curve. It has a pair of superposed sections defined by two valley fold lines that are inclined at a predetermined angle with respect to the line.
The pair of superimposing portions are superposed so as to be detachable from each other, and are laminated on the inner surface side of the first portion or the second portion.
The pair of common flaps are further provided with a locking projection and a locking hole, respectively.
The locking projection is inserted and locked in the locking hole of the common flap, which is different from the formed common flap .
Further, a foldable packaging box in which each of the pair of overlapping portions is provided with an inclined edge by a V-shaped notch. The foldable packaging box according to claim 1, wherein the locking hole is provided in the first portion and the locking projection is provided in the second portion. The first portion of the pair of common flaps is formed with dimensions in which the tips of each other overlap.
The foldable packaging box according to claim 1 or 2, wherein a meshing portion that meshes with the other tip is formed at the tip of at least one of the pair of the first portions. The foldable packaging box according to any one of claims 1 to 3 , wherein the mountain fold line extends along the second fold curve. A pair of first side plates and a pair of second side plates are alternately arranged via a first folding curve, and the first side plate and the second side plate arranged on the same plane are on the same plane. The outer peripheral wall in which the remaining first side plate and the second side plate arranged so as to face each other are
It is provided with a lid wall laminated between the outer peripheral walls.
Of the pair of first side plates and the pair of second side plates, the lid wall includes one of the first side plates and one of the second side plates, and the other of the first side plates and the other of the second side plates. As a set, each has a pair of common flaps connected to each other via a second folding curve that intersects the first folding curve.
Each of the pair of common flaps
The first part continuous with the first side plate,
A second part continuous with the second side plate,
A mountain fold line located inside the first fold curve, which is continuous with the common flap at the end of the first fold curve between the first side plate and the second side plate, and the first fold. It has a pair of superposed portions that are continuous with the end of the curve and defined by two valley fold lines that are inclined at a predetermined angle with respect to the mountain fold line.
The pair of overlapping portions can be brought close to each other and separated from each other by bending along the mountain fold line and the valley fold line, and are laminated on the inner surface side of the first side plate and the second side plate.
The pair of common flaps are further provided with a locking projection and a locking hole, respectively.
The locking projection is inserted and locked in the locking hole of the common flap, which is different from the formed common flap .
Further, a foldable packaging box in which each of the pair of overlapping portions is provided with an inclined edge by a V-shaped notch.

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