JP6944340B2 - Foldable packaging box - Google Patents

Description

The present invention relates to a foldable packaging box.

Patent Documents 1 and 2 disclose a packaging box including an outer peripheral wall composed of four side plates and a bottom wall composed of four flaps connected to the side plates. Of the four flaps, the first flap and the third flap are connected with a sticking part via a folding curve, and the second flap is stuck to the sticking part connected to the first flap. The fourth flap is attached to the attachment portion connected to the third flap.

In this packaging box, by expanding the outer peripheral wall in the folded state into a square cylinder, the first to fourth flaps are interlocked to rotate with respect to the side plate, and the bottom of the outer peripheral wall can be closed.

Registered Utility Model No. 3052411 U.S. Pat. No. 2,327,709

In the packaging box disclosed in Patent Document 1, the attachment portions are located on the same plane with respect to the first flap and the third flap. Therefore, on the bottom side of the folded packaging box, the first side plate (third side plate), the first flap (third flap), the attachment portion, the second flap (fourth flap), and the second side plate (fourth). Side plates) are overlapping. That is, the folded packaging box has a five-layer structure on the bottom side and a two-layer structure on the opposite side, so that the balance is poor.

In the packaging box disclosed in Patent Document 2, the sticking portion is bent and arranged on the upper side of the first flap and the third flap. Therefore, on the bottom side of the folded packaging box, the attachment portions are located on the same plane with respect to the first flap and the third flap. That is, in the folded state of the packaging box of Patent Document 2, the bottom side has a four-layer structure, so that the balance is improved as compared with the packaging box of Patent Document 1. However, in Patent Document 2, since the repulsive force in the direction of unfolding acts between the first flap and the second flap and the attachment portion, the workability when assembling the folded packaging box is poor.

An object of the present invention is to provide a foldable packaging box capable of improving the balance in the folded state and improving the workability at the time of assembly.

The foldable packaging box of the present invention has a square cylindrical outer peripheral wall having a first side plate, a second side plate, a third side plate, and a fourth side plate, which are continuous in order via a first folding curve, and the first side plate. The second side plate, the third side plate, and the first flap, the second flap, the third flap, and the fourth flap protruding inward from the lower edge of the fourth side plate, respectively, of the outer peripheral wall. It has a square bottom wall that closes the bottom.

In the first aspect, the second flap side of the first flap and the fourth flap side of the third flap are connected to the fourth flap side of the first flap via a second folding curve extending from a corner of the bottom wall toward the center. The first flap and the bonded portion bent on the upper side of the third flap are connected to each other, and the second flap is attached to the upper side of the bonded portion connected to the first flap, and the third flap is attached. The fourth flap is attached to the upper side of the attachment portion connected to the flap, and the first flap and the third flap are oriented away from the first flap or the third flap. A regulating section is provided to regulate the rotation of the sticking section.

In the second aspect, the first flap side of the second flap and the fourth flap side of the third flap are connected to the fourth flap side of the second flap via a second folding curve extending from a corner of the bottom wall toward the center. The 2 flaps and the attached portion bent on the upper side of the 3rd flap are connected to each other, and the 1st flap is attached to the upper side of the attached portion connected to the 2nd flap, and the 3rd flap is attached. The fourth flap is attached to the upper side of the attachment portion connected to the flap, and the second flap and the third flap are oriented away from the second flap or the third flap. A regulating section is provided to regulate the rotation of the sticking section.

According to these foldable packaging boxes, the flap in which the attachment portion is projected is provided with a regulation portion that regulates the rotation of the attachment portion in a direction away from the flap, so that the package box in the assembled state can be folded. It is possible to suppress the return to the state. Further, since the regulation part is not attached to the adjacent flap, the tensile force due to the load of the article housed in the packaging box does not concentrate on the regulation part. Therefore, it is possible to prevent the bottom wall of the packaging box from being torn from the formed portion of the regulation portion.

The folded packaging box has a first side plate, a second side plate, a third side plate, and a fourth side plate that are continuous in order via a first folding curve, and the first side plate and the fourth side plate are in the same plane. An outer peripheral wall arranged on the first side plate and one side of the fourth side plate in which the second side plate and the third side plate are arranged on the same plane, the first side plate, the second side plate, and the above. The third side plate and the lower edge of the fourth side plate have a continuous first flap, a second flap, a third flap, and a fourth flap, respectively, and the first flap and the second flap are the first side plate. A bottom wall is provided which is bent and arranged between the second side plate and the third side plate and the fourth flap is bent and arranged between the third side plate and the fourth side plate.

In the first aspect, on the side of the first flap opposite to the fourth flap and on the side of the third flap opposite to the second flap, from the lower end of the first folding curve to the first folding curve. The sticking portions protruding through the second folding curve extending in the direction away from each other are connected to each other, and the second flap is stuck to the sticking portion connected to the first flap, and the third flap is attached. It said fourth flap to the bond portion provided continuously to the flap and is adhered, wherein the first flap and the third flap, to extend into the adhesive portion beyond said second folding line A regulation portion for restricting bending along the second folding curve is provided by the cutting line provided in the above.

In the second aspect, on the side of the second flap opposite to the third flap and the side of the third flap opposite to the second flap, from the lower end of the first folding curve to the first folding curve. The sticking portions protruding through the second folding curve extending in the direction away from each other are connected to each other, and the first flap is stuck to the sticking portion connected to the second flap, and the third flap is attached. wherein the adhesive portion provided continuously to the flap and fourth flaps are adhered, wherein the second flap and the third flap, to extend into the adhesive portion beyond said second folding line A regulation portion for restricting bending along the second folding curve is provided by the cutting line provided in the above.

According to these packaging boxes, the bottom side of the side plates to which the flaps are continuously provided has a four-layer structure, and the opposite side of the side plates has a two-layer structure. Therefore, in the packaging box of this aspect, the balance in the folded state can be improved as compared with the packaging box having a five-layer structure on the bottom side. As a result, workability when stacking folded packaging boxes at the time of shipment and tying them with a string can be improved.

The first flap and the restricting portion of the third flap are convex portions protruding from the second folding curve, and the sticking portion has a direction in which the convex portion protrudes from the second folding curve. A recess is formed that is recessed in the opposite direction. The convex portion and the concave portion have complementary shapes.

An inclined edge inclined in a direction away from the first side plate is formed on the first side plate side of the attachment portion continuously provided to the first flap, and the said is continuously provided to the third flap. On the third side plate side of the sticking portion, an inclined edge inclined in a direction away from the third side plate is formed. Further, on the first side plate side of the second flap, an inclined edge inclined at the same inclination angle as the inclined edge of the attachment portion connected to the first flap is formed, and the fourth flap is formed. On the third side plate side of the flap, an inclined edge is formed which is inclined at the same inclination angle as the inclined edge of the attachment portion connected to the third flap. According to this aspect, it is possible to suppress the interference of the attachment portion with the side plate when the outer peripheral wall is widened, so that the assembly workability can be improved. Further, when the sticking portion interferes with the side plate, it is possible to prevent the other flap from bending along the second folding curve.

The tips of the first flap and the third flap overlap each other, and at least one of the tip of the first flap and the tip of the third flap is formed with a notch in which the other is inserted. ing. According to this aspect, since the other is inserted into the notch of one of the first flap and the third flap, it is possible to prevent the bottom wall of the foldable packaging box from coming off due to the weight of the contained article.

In the foldable packaging box of the present invention, it is possible to prevent the sticking portion from returning to the folded state by the regulating portion. In addition, workability when assembling the folded packaging box can be improved. Further, since the sticking portion is located on the same plane with respect to the flap in the folded state, the balance of the foldable packaging box in the folded state can be improved.

The lower perspective view which shows the foldable packaging box of 1st Embodiment of this invention. Bottom view of FIG. FIG. 1 is a plan sectional view of FIG. An upward perspective view showing a sealed state of a foldable packaging box. FIG. 2A is a sectional view taken along line IV-IV. The plan view which shows the blank of the foldable packaging box of 1st Embodiment. A partially enlarged plan view of FIG. 5A. A partially enlarged plan view of FIG. 5A. The perspective view which shows the box making process of a foldable packaging box. FIG. 3 is a cross-sectional perspective view showing a foldable packaging box in a foldable state in which the second side plate and the third side plate are broken. The cross-sectional view which shows the bending process of the attachment part with respect to the bottom flap. Bottom view showing the assembly process of the foldable packaging box. The bottom view which shows the folded state of the foldable packaging box of 1st Embodiment. The bottom view which shows the folding state of the foldable packaging box of a conventional example. Bottom view of the foldable packaging box of the second embodiment. A cross-sectional view of the foldable packaging box of the second embodiment as viewed from above. The plan view which shows the blank of the foldable packaging box of 2nd Embodiment. The perspective view which shows the foldable packaging box of the 2nd Embodiment in the fold state which broke the 2nd side plate and the 3rd side plate. The plan view which shows the 1st modification of the convex part of a foldable packaging box. The plan view which shows the 2nd modification of the convex part of the foldable packaging box. The plan view which shows the 3rd modification of the convex part of the foldable packaging box. The plan view which shows the 4th modification of the convex part of the foldable packaging box. The plan view which shows the 5th modification of the convex part of the foldable packaging box. The plan view which shows the reference example of the convex part of the foldable packaging box.

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

(First Embodiment)
1 to 9A 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 wall 18 that closes the opening on the bottom side of the outer peripheral wall 12, and a heaven that closes the opening on the top side of the outer peripheral wall 12. It is provided with a wall 25. Referring to FIGS. 7A and 8, the packaging box 10 covers the bottom of the outer peripheral wall 12 by the bottom flaps 19A to 19D constituting the bottom wall 18 by expanding the outer peripheral wall 12 in the folded state into a square cylinder. It is a one-action assembly type that can be used.

(Outline of packaging box)
The packaging box 10 is formed by bending and gluing a predetermined portion of a blank shown in FIG. 5A. The blank is formed by punching a corrugated cardboard sheet made of paper by a well-known paper punching device. The corrugated cardboard sheet has a 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. 5A 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. 5A 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 has a side plate (first side plate) 13A and a side plate (second side plate) which are sequentially continuous with each other via a folding curve (first folding curve) 15a to 15c composed of general-purpose ruled lines. A side plate) 13B, a side plate (third side plate) 13C, and a side plate (fourth side plate) 13D are provided. Referring to FIG. 5A, a glue margin plate 14 is continuously provided at an end portion of the side plate 13A opposite to the side plate 13B via a folding curve (first folding curve) 15d. The glue margin plate 14 is attached to the end portion of the side plate 13D opposite to the side plate 13C by an adhesive such as a vinyl acetate emulsion. As a result, the side plate 13D is continuously provided to the side plate 13A via the glue margin plate 14.

The side plates 13A and 13C have substantially the same square shape and face each other. The side plate 13B and the side plate 13D have substantially the same square shape having a narrower width than the side plate 13A and the side plate 13C. The side plates 13B and 13D extend in the direction orthogonal to the side plates 13A and 13C and face each other.

As shown in FIGS. 1 to 2B, the bottom wall 18 has a bottom flap (first flap) 19A, a bottom flap (second flap) 19B, a bottom flap (third flap) 19C, and a bottom flap (fourth flap). It is equipped with 19D. The bottom flaps 19A to 19D are connected to the lower edge of the side plates 13A to 13D via the folding curves 20a to 20d made of general-purpose ruled lines, and project inward from the side plates 13A to 13D. The folding curves 20a to 20d extend in a direction intersecting the folding curves 15a to 15d, which are the side edges of the side plates 13A to 13D.

Referring to FIG. 5A, the bottom flap 19A and the bottom flap 19C have substantially the same square shape and face each other. The bottom flap 19B and the bottom flap 19D have substantially the same trapezoidal shape, and their widths are narrower than the widths of the bottom flap 19A and the bottom flap 19C. The bottom flap 19B and the bottom flap 19D project in a direction orthogonal to the bottom flap 19A and the bottom flap 19C and face each other.

In the bottom flap (first flap) 19A, a sticking portion 21A is continuously provided on the adjacent bottom flap (second flap) 19B side via a folding curve (second folding curve) 22a. In the bottom flap (third flap) 19C, a sticking portion 21B is continuously provided on the adjacent bottom flap (fourth flap) 19D side via a folding curve (second folding curve) 22b. The sticking portions 21A and 21B are formed in a substantially triangular shape with the folding curves 22a and 22b as hypotenuses.

The folding curves 22a and 22b are formed by general-purpose ruled lines in the present embodiment, but may be formed by lead ruled lines in which cutting lines are provided on the general-purpose ruled lines. The folding curves 22a and 22b extend from the corners of the bottom wall 18 toward the center. The angle C1 on the bottom flap 19B side of the bottom flap 19A is the intersection of the folding curves 15a, 20a, and 20b. The angle C2 on the bottom flap 19D side of the bottom flap 19C is the intersection of the folding curves 15c, 20c, and 20d. The folding curve 22a is formed from the intersection C1 at an inclination angle of 45 degrees with respect to the folding curve 20a, and the folding curve 22b is formed at an inclination angle of 45 degrees from the intersection C2 with respect to the folding curve 20c.

Referring to FIG. 4, the attachment portions 21A and 21B are bent along the folding curves 22a and 22b and are arranged so as to be overlapped on the upper side of the bottom flaps 19A and 19C. A part of the bottom flap 19B is attached to the upper side of the attachment portion 21A, and a part of the bottom flap 19D is attached to the upper side of the attachment portion 21B. An adhesive such as a vinyl acetate emulsion can be used for sticking (gluing).

As shown in FIGS. 1 and 3, the top wall 25 includes a top flap 26A, a top flap 26B, a top flap 26C, and a top flap 26D. The top flaps 26A to 26D are continuously provided on the upper edges of the side plates 13A to 13D via the folding curves 27a to 27d made of general-purpose ruled lines, and project inward from the side plates 13A to 13D. The folding curves 27a to 27d extend in a direction intersecting the folding curves 15a to 15d forming the side edges of the side plates 13A to 13D, and with respect to the folding curves 20a to 20d forming the lower edge of the side plates 13A to 13D. It extends in parallel.

Referring to FIG. 5A together, the top flap 26B and the top flap 26D are inner flaps having substantially the same square shape and face each other. The top flap 26A and the top flap 26C are substantially the same square outer flaps having a wider width than the top flap 26B and the top flap 26D. The top flaps 26A and 26C extend in the direction orthogonal to the top flaps 26B and 26D, and are arranged so as to be overlapped on the upper side of the top flaps 26B and 26D to close the opening on the top side of the outer peripheral wall 12. The protruding lengths of the ceiling flaps 26A to 26D from the folding curves 27a to 27d to the tips of the ceiling flaps 26A to 26D are the tips of the ceiling flaps 26A and the ceiling flaps 26C with the opening on the top side of the outer peripheral wall 12 closed. The dimensions are set so that the tips meet.

When manufacturing the blank of FIG. 5A, as shown in FIG. 6, the bottom flaps 19A to 19D are bent with respect to the side plates 13A to 13D along the folding curves 20a to 20d. Then, the side plate 13A is bent with respect to the side plate 13B along the folding curve 15a, and then the side plate 13D is bent with respect to the side plate 13C along the folding curve 15c. Then, the side plate 13D is attached to the glue margin plate 14. Further, the bottom flap 19B is attached to the attachment portion 21A connected to the bottom flap 19A, and the bottom flap 19D is attached to the attachment portion 21B connected to the bottom flap 19C. As a result, the manufacturing of the folded packaging box 10 is completed.

Referring to FIG. 7A, in the folded packaging box 10, the attachment portions 21A and 21B are located on the same plane with respect to the bottom flaps 19A and 19C. When assembling the folded packaging box 10, as shown in FIG. 8, the side plates 13B and 13C are bent along the folding curve 15b, and the side plates 13A and 13D are bent along the folding curve 15d. As a result, the bottom flaps 19A to 19D are interlocked with each other and bend downward with respect to the side plates 13A to 13D. Then, by expanding the outer peripheral wall 12 into a square cylinder, as shown in FIGS. 1 to 2B, the bottom flaps 19A to 19D can close the opening on the bottom side of the outer peripheral wall 12.

(Details of bottom wall)
When assembling the folded packaging box 10, the sticking portions 21A and 21B are bent along the folding curves 22a and 22b with respect to the bottom flaps 19A and 19C, and are overlapped on the upper side of the bottom flaps 19A and 19C. At this time, as shown in FIG. 7B, a repulsive force acting on the sticking portions 21A and 21B returns to the direction D1 developed by the waist (rigidity) of the corrugated cardboard sheet, that is, the direction D1 away from the bottom flaps 19A and 19C. Therefore, the workability when assembling the packaging box 10 is poor.

Therefore, as shown in FIGS. 1 to 2B, the bottom flaps 19A and 19C have a convex portion (regulating portion) 30 that regulates bending along the folding curves 22a and 22b and rotation of the attachment portions 21A and 21B. Is provided. Further, the bottom flaps 19A to 19D including the attachment portions 21A and 21B are provided with the inclined edges 34a to 35b for suppressing interference with the side plates 13A and 13C, and the bottom flaps 19A and 19C and the bottom flaps 19D and 19B. Inclined edges 36a and 36b for restraining are provided. Further, the bottom wall 18 is provided with notches 37a and 37b for preventing the stored articles from coming off due to the weight.

(Details of Regulatory Department)
As shown in FIGS. 1, 2A, and 5A, the convex portion 30 is provided on the bottom flaps 19A and 19C so as to project from the folding curves 22a and 22b into the attachment portions 21A and 21B. The convex portion 30 has a trapezoidal shape and projects from the bottom flaps 19A and 19C in the same plane so as to be located substantially at the center of the total length of the bottom flaps 19A and 19C in the protruding direction. Further, the bottom flaps 19A and 19C are formed with recesses 31 that are recessed in the direction opposite to the direction in which the convex portion 30 protrudes from the folding curves 22a and 22b, respectively. The convex portion 30 and the concave portion 31 have a complementary shape, a cutting line 32 is provided between the bottom flaps 19A and 19C and the attachment portions 21A and 21B, and the attachment portions 21A and 21B are bent with respect to the bottom flaps 19A and 19C. It is formed by that.

With reference to FIGS. 5B and 5C, the cutting line 32 has the first end 32a and the second end 32b located on the bottom flaps 19A and 19C, crossing the folding curves 22a and 22b into the attachment portions 21A and 21B. It is extending. The intermediate portion 32c located in the attachment portions 21A and 21B in the unfolded state extends in parallel along the folding curves 22a and 22b. The folding curves 22a and 22b are not formed between both ends 32a and 32b of the cutting line 32.

As shown in FIGS. 7B and 8, when the attachment portions 21A and 21B are bent with respect to the bottom flaps 19A and 19C when the folded packaging box 10 is assembled, the convex portions 30 projecting from the bottom flaps 19A and 19C. Interferes with the adjacent bottom flaps 19B and 19D. Then, the convex portion 30 and the bottom flaps 19B and 19D are elastically bent and relatively slidably contacted to perform the assembly work. When the convex portion 30 rotates in the assembling direction D2 with reference to the state shown in FIG. 7B, that is, the neutral state in which the bottom flaps 19A and 19C and the bottom flaps 19B and 19D are located in the orthogonal directions, the attachment portion 21A to the reverse direction D1 is attached. , 21B rotation is regulated by the convex portion 30. Therefore, it is possible to prevent the packaging box 10 from returning to the folded state at the time of assembly, so that the assembly workability of the packaging box 10 can be improved.

Here, if the protruding dimension P of the convex portion 30, that is, the protruding dimension P from the folding curves 22a and 22b to the tip of the convex portion 30 is too small, the rotation restricting effect of the sticking portions 21A and 21B cannot be sufficiently obtained. Therefore, when the packaging box 10 is made of corrugated cardboard, the protruding dimension P of the convex portion 30 is preferably 0.5 mm or more, and more preferably 1 mm or more. Further, when the packaging box 10 is made of a single thick paper, the protruding dimension P of the convex portion 30 is preferably 0.5 mm or more.

Further, if the protruding dimension P of the convex portion 30 is too large, there is an inconvenience that the convex portion 30 is bent or the base portion of the convex portion 30 is torn due to excessive interference with the bottom flaps 19B and 19D. .. Therefore, when the packaging box 10 is made of corrugated cardboard, the protruding dimension P of the convex portion 30 is preferably t × 3 mm or less, and more preferably t√2 + 1 mm or less with respect to the thickness t of the corrugated cardboard. .. Further, when the packaging box 10 is made of a single thick paper, the protruding dimension P of the convex portion 30 is preferably 5 mm or less.

That is, when the packaging box 10 is made of corrugated cardboard, the protruding dimension P of the convex portion 30 is preferably 0.5 mm or more and t × 3 mm or less (0.5 mm ≦ P ≦ t × 3 mm), and 1 mm or more t. It is more preferably √2 + 1 mm or less (1 mm ≦ P ≦ t √2 + 1 mm). When the packaging box 10 is made of a single thick paper, it is preferably 0.5 mm or more and 5 mm or less. In this way, the convex portion 30 can sufficiently obtain the effect of restricting the rotation of the sticking portions 21A and 21B, and it is possible to prevent the convex portion 30 from being bent or torn.

As described above, since the packaging box 10 of the present embodiment is provided with the convex portions 30 on the bottom flaps 19A and 19C, respectively, the rotation of the attachment portions 21A and 21B to the orientation C1 away from the bottom flaps 19A and 19C is performed. Can be regulated. Therefore, it is possible to prevent the packaging box 10 in the assembled state from returning to the folded state. Further, since the convex portion 30 is not attached to the adjacent bottom flaps 19B and 19D, the tensile force due to the load of the article housed in the packaging box 10 does not concentrate on the convex portion 30. Therefore, it is possible to prevent the bottom wall 18 of the packaging box 10 from being torn from the formed portion of the convex portion 30.

(Details of inclined edge)
The inclined edge 34a is formed on the side plate 13A side of the attachment portion 21A, and the inclined edge 34b is formed on the side plate 13C side of the attachment portion 21B. The inclined edges 34a and 34b are inclined in a direction away from the side plates 13A and 13C from the base end side to the tip end side of the folding curves 22a and 22b.

The inclined edges 35a and 35b are formed on the bottom flaps 19B and 19D so as to coincide with the inclined edges 34a and 34b of the attachment portions 21A and 21B. The inclined edge 35a is formed on the side plate 13A side of the bottom flap 19B, extends from the intersection C1 of the folding curves 20a and 20b toward the center of the bottom wall 18, and is inclined away from the side plate 13A. The inclined edge 35b is formed on the side plate 13C side of the bottom flap 19D, extends from the intersection C2 of the folding curves 20c and 20d toward the center of the bottom wall 18, and is inclined away from the side plate 13C.

As shown in FIG. 8, when the packaging box 10 is assembled, the attachment portions 21A and 21B and the bottom flaps 19B and 19D interfere with the side plates 13A and 13C. If these interfere excessively, the resistance becomes large, so that not only the assembly workability is deteriorated, but also the bottom flaps 19B and 19D that do not form a folding curve are bent along the folding curves 22a and 22b.

As shown by the alternate long and short dash line in FIG. 5B, when the inclined edges 34a and 34b are not formed on the attachment portions 21A and 21B (Patent Document 2), the attachment portions 21A in the direction orthogonal to the folding curves 22a and 22b, The maximum width of 21B is W1. As the width W becomes wider, the resistance due to the interference of the attachment portions 21A, 21B and the bottom flaps 19B, 19D to the side plates 13A, 13C increases.

Inclined edges 34a to 35b for suppressing interference with the side plates 13A and 13C are formed on the attachment portions 21A and 21B and the bottom flaps 19B and 19D of the present embodiment. Therefore, since the width W2 of the bonding portions 21A and 21B can be made narrower than the maximum width W1, resistance due to interference can be reduced. Therefore, assembling workability can be improved, and bending of the bottom flaps 19B and 19D along the folding curves 22a and 22b can be prevented.

As shown in FIGS. 1 and 2A, the inclined edges 36a and 36b are formed on the bottom flap 19C side of the bottom flap 19B and the bottom flap 19A side of the bottom flap 19D. The inclined edge 36a extends from the intersection of the folding curve 20b and the folding curve 20b toward the center of the bottom wall 18 and is inclined away from the side plate 13C. The inclined edge 36b extends from the intersection of the folding curve 20d and the folding curve 20a toward the center of the bottom wall 18 and is inclined away from the side plate 13A.

As shown most clearly in FIG. 8, when assembling the packaging box 10, the edges of the bottom flap 19A and the bottom flap 19D interfere with each other, and the edges of the bottom flap 19C and the bottom flap 19B interfere with each other, thereby hindering assembly workability. do. However, in the present embodiment, since the bottom flaps 19B and 19D are provided with the inclined edges 36a and 36b, the assembly workability of the packaging box 10 can be improved.

(Details of the notch)
As shown in FIGS. 1 to 2B, the notches 37a and 37b are provided at the center of the tips of the bottom flaps 19A and 19C. The protruding length of the bottom flaps 19A to 19D, that is, the dimension from the folding curves 20a to 20d to the tip of the bottom flaps 19A to 19D is set to be larger than the protruding length of the top flaps 26A to 26D. That is, the bottom flap 19A and the tips of the bottom flap 19C are set to have dimensions that overlap each other.

As shown in FIGS. 2B and 5B, the notches 37a and 37b are concave recesses formed between the bottom flaps 19A and 19C and the attachment portions 21A and 21B. The notches 37a and 37b are formed at a depth of half the overlap dimension in the protruding direction of the bottom flaps 19A and 19C. The bottom flaps 19A to 19D are integrated by arranging the notches 37a and 37b of the bottom flap 19A and the bottom flap 19C so as to mesh with each other. Further, a folding curve 38 made of a general-purpose ruled line is provided on the side of the cutout portions 37a and 37b (on the side opposite to the pasting portions 21A and 21B). The folding curve 38 has a function of preventing the bottom flaps 19A and 19C from breaking during assembly and unfolding by imparting flexibility to the bottom flaps 19A and 19C at the edges of the notches 37a and 37b.

(Folded packaging box)
As shown in FIGS. 7A and 9A, in the folded packaging box 10, the side plate 13A and the side plate 13D are arranged on the same plane, and the side plate 13B and the side plate 13C are on the same plane on one side of the side plate 13A and the side plate 13D. It is placed on top. Further, the bottom flap 19A and the bottom flap 19B are bent and arranged between the side plate 13A and the side plate 13B, and the bottom flap 19C and the bottom flap 19D are bent and arranged between the side plate 13C and the side plate 13D.

As described above, the attached portions 21A and 21B in the folded state are located on the same plane with respect to the bottom flaps 19A and 19C. The sticking portion 21A is located on the opposite side of the bottom flap 19D, and the sticking portion 21B is located on the opposite side of the bottom flap 19B. Further, the folding curves 22a and 22b between the bottom flaps 19A and 19C and the attachment portions 21A and 21B are the lower ends (intersection points C1 and 15c) of the folding curves (first folding curves) 15a and 15c which are the side edges of the side plates 13A to 13D. It extends from C2) in a direction away from the folding curves 15a and 15c.

The bottom flaps 19A to 19D are located only in the bottom region of the side plates 13A to 13D. Therefore, on the bottom side of the folded packaging box 10, the side plates 13A and 13D, the bottom flaps 19A and 19D, the bottom flaps 19B and 19C, and the side plates 13B and 13C are laminated to form a four-layer structure. Further, on the top side of the folded packaging box 10, side plates 13A, 13D and top flaps 26A, 26D located on a flat surface and side plates 13B, 13C and top flaps 26B, 26C located on a flat surface are laminated. It has a two-layer structure.

FIG. 9B shows a packaging box 10'of a conventional example (Patent Document 1). In this packaging box 10', the attachment portions 21A'and 21B' are located on a flat surface in the assembled state with respect to the bottom flaps 19A'and 19C', and are folded in the folded state. That is, the bottom side of the folded packaging box 10'has a five-layer structure in which the attachment portions 21A'and 21B' are located in the central portion in addition to the four layers similar to those in the present embodiment. Therefore, the difference between the thickness on the bottom side and the thickness on the top side of the packaging box 10'is equivalent to three corrugated cardboard sheets.

On the other hand, in the packaging box 10 of the present embodiment, the difference between the thickness on the bottom side and the thickness on the top side is equivalent to two corrugated cardboard sheets. Therefore, the packaging box 10 of the present embodiment can improve the balance in the folded state as compared with the conventional packaging box 10'. As a result, workability when stacking the folded packaging boxes 10 at the time of shipment and tying them with a string can be improved. Moreover, since the volume of the stacked packaging boxes 10 can be reduced, the transportation cost can be reduced.

Further, in the conventional packaging box 10', when the side plates 13A'and 13D' are bent along the folding curves 15a' and 15c' during box making, any one of the side plates 13A' to 13D'is bent in the folding curve 15a'. , 15c'may bend at a part O other than. The cause of this asymmetrical bending is that the attachment portions 21A'and 21B'intervene between the bottom flaps 19A'and 19B' and the bottom flaps 19C' and 19D', and the inside of the folding curve 15a' and 15c'. It is considered that the space S is formed in the portion.

As shown in FIG. 9A, in the packaging box 10 of the present embodiment, since nothing is interposed between the bottom flaps 19A and 19B and the bottom flaps 19C and 19D, there is a space inside the folding curves 15a and 15c. Is not formed. Therefore, any one of the side plates 13A to 13D does not bend at a portion other than the folding curves 15a and 15c. As a result, since the asymmetrical bending of the packaging box 10 can be prevented at the time of box making, it is possible to prevent the glue margin plate 14 from being tilted and attached to the side plate 13D. In addition, it is possible to prevent the corners of the assembled packaging box 10 from becoming uneven.

As described above, in the packaging box 10 of the present embodiment, since the bottom flaps 19A and 19C are provided with the convex portions (regulating portions) 30, the pasting portions 21A and 21B return to the folded state during and after assembly. Can be suppressed. Therefore, the assembly workability can be improved and the stability of the assembled state can be improved.

Further, the convex portion 30 and the concave portion 31 can shorten the length of the folding curves 22a and 22b, that is, the total bending length of the portion where the attachment portions 21A and 21B are bent with respect to the bottom flaps 19A and 19C. Therefore, the bendability of the attachment portions 21A and 21B with respect to the bottom flaps 19A and 19C can be improved.

Further, since the notches 37a and 37b that mesh with each other are formed at the tips of the bottom flaps 19A and 19C, it is possible to prevent the bottom wall 18 of the packaging box 10 from coming off due to the weight of the contained article and the article from falling off. ..

Further, since the balance between the bottom side and the top side of the packaging box 10 in the folded state can be improved, workability at the time of shipment can be improved, transportation costs can be reduced, and poor adhesion of the glue margin plate 14 can be prevented.

(Second Embodiment)
10A to 12 show the packaging box 10 of the second embodiment. In this second embodiment, the sticking portion 21A is formed on the bottom flap 19B, and the sticking portion 21B is formed on the bottom flap 19C. That is, it differs from the first embodiment in that the flaps forming the attachment portions 21A and 21B are not the opposite bottom flaps 19A and 19C or 19B and 19D but the adjacent bottom flaps 19B and 19C.

Referring to FIGS. 10A to 11, the bottom flap 19B has a bonding portion 21A via a folding curve (second folding curve) 22a extending from the corner C1 of the bottom wall 18 on the bottom flap 19A side toward the center. It is installed continuously. The sticking portion 21A is folded on the upper side of the bottom flap 19B, and the bottom flap 19A is stuck on the upper side of the sticking portion 21A. The bottom flap 19B is provided with a convex portion 30 that regulates the rotation of the sticking portion 21A. The sticking portion 21A is formed with an inclined edge 34a for improving assembly workability, and a concave portion 31 having a shape corresponding to the convex portion 30 is formed. The bottom flap 19A is provided with an inclined edge 35a corresponding to the inclined edge 34a.

Referring to FIG. 12, in the folded state of the packaging box 10, the sticking portion 21A is located on the opposite side of the bottom flap 19C, and the sticking portion 21B is located on the opposite side of the bottom flap 19B. Further, the folding curves 22a and 22b between the bottom flaps 19B and 19C and the attachment portions 21A and 21B are the lower ends (intersection points C1 and) of the folding curves (first folding curves) 15a and 15c which are the side edges of the side plates 13A to 13D. It extends from C2) in a direction away from the folding curves 15a and 15c.

As described above, the convex portion 30 is not limited to the facing bottom flaps 19A, 19C or 19B, 19D, and may be provided on the adjacent bottom flaps 19B, 19C or 19A, 19D. Then, the packaging box 10 of the second embodiment described in this way can obtain the same action and effect as the packaging box 10 of the first embodiment.

(Modified example of regulatory section)
13 to 17 show a modified example of the convex portion (regulating portion) 30 of the packaging box 10. As in these modified examples, the shape of the convex portion 30 can be changed as needed.

As shown in the first modification of FIG. 13 and the second modification of FIG. 14, the convex portion 30 may be configured to have a concave portion 40 recessed toward the bottom flaps 19A and 19C. The recess 40 may be formed in an arc shape as in the first modification of FIG. 13, or may be formed in a triangular shape as in the second modification of FIG. Further, the depth of the recess 40 may be such that the cutting line 32 is recessed toward the bottom flaps 19A and 19C from the folding curves 22a and 22b.

As in the third modification of FIG. 15, the convex portion 30 may be configured to project in an arc shape. Further, as in the fourth modification of FIG. 16, a plurality of continuous (three in the drawing) arcuate convex portions 30a to 30c may be formed.

As shown in the fifth modification of FIG. 17, convex portions 30a and 30b may be formed on both the bottom flaps 19A and 19C and the attachment portions 21A and 21B. That is, by providing the cutting line 32 in a substantially S shape, the convex portions 30a protruding from the bottom flaps 19A and 19C toward the attachment portions 21A and 21B and the bottom flaps 19A and 19C from the attachment portions 21A and 21B A convex portion 30b protruding toward the surface may be formed.

Further, the convex portion (regulating portion) 30 is not limited to a configuration in which the bottom flaps 19A and 19C project from the attachment portions 21A and 21B, and can be changed as needed. For example, as shown in the reference example of FIG. 18, the regulating portion may be composed of a pair of convex portions 30a and 30b formed internally by the first cutting line 43 and the pair of second cutting lines 44. The first cutting line 43 is provided on the same straight line as the folding curves 22a and 22b. The second cutting line 44 is provided at both ends of the first cutting line 43 extends in a direction perpendicular to the first cutting line 43. Convex portions 30a and 30b are formed on the bottom flaps 19A and 19C and the attachment portions 21A and 21B by these cutting lines 43 and 44.

The convex portions 30a and 30b thus described do not protrude beyond the folding curve (second folding curve) 22a and 22b from one of the bottom flaps 19A and 19C and the pasting portions 21A and 21B to the other. However, in this embodiment, the bottom flaps 19A and 19C and the convex portions 30a and 30b of the attachment portions 21A and 21B interfere with each other, so that the bottom flaps 19A and 19C are bent along the folding curves 22a and 22b and the bottom flaps 19A and 19C are separated from each other. It is possible to regulate the rotation of the attachment portions 21A and 21B to. Therefore, in the packaging box 10 provided with the regulation portion of this reference example , the same operations and effects as those of the first embodiment can be obtained.

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 convex portion (regulatory portion) 30 is not limited to the shape and configuration described in the above-described embodiment and modification, and can be changed as needed, and can be bent along a folding curve and in a direction away from the flap. Any configuration may be used as long as it can regulate the rotation of the sticking portion.

The notch for preventing the bottom wall 18 from coming off may be provided in only one of the bottom flap 19A and the bottom flap 19C. In this case, the notch is formed at the same depth as the overlap dimension in the protruding direction of the bottom flap.

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

10 ... Folding packaging box 12 ... Outer wall 13A ... Side plate (first side plate)
13B ... Side plate (second side plate)
13C ... Side plate (third side plate)
13D ... Side plate (4th side plate)
14 ... Glue allowance plate 15a to 15d ... Folded curve 18 ... Bottom wall 19A ... Bottom flap (first flap)
19B ... Bottom flap (2nd flap)
19C ... Bottom flap (3rd flap)
19D ... Bottom flap (4th flap)
20a to 20d ... Folded curve 21A, 21B ... Adhesive part 22a, 22b ... Folded curve 25 ... Top wall 26A to 26D ... Top flap 27a to 27d ... Folded curve 30, 30a to 30c ... Convex part (regulatory part)
31 ... Recessed 32 ... Cutting line 32a ... First end 32b ... Second end 32c ... Intermediate part 34a, 34b ... Inclined edge 35a, 35b ... Inclined edge 36a, 36b ... Inclined edge 37a, 37b ... Notch 38 ... Folded curve 40 … Recessed
43 ... First cutting line
44 ... Second cutting line

Claims (9)

A square cylindrical outer wall having a first side plate, a second side plate, a third side plate, and a fourth side plate, which are continuous in order through the first folding curve, respectively.
It has a first flap, a second flap, a third flap, and a fourth flap that protrude inward from the lower edge of the first side plate, the second side plate, the third side plate, and the fourth side plate, respectively. It is provided with a square bottom wall that closes the bottom of the outer peripheral wall.
The first flap and the first flap are on the second flap side of the first flap and on the fourth flap side of the third flap via a second folding curve extending from a corner of the bottom wall toward the center. 3 Folded sticking parts are connected to the upper side of the flaps.
The second flap is attached to the upper side of the attachment portion connected to the first flap, and the fourth flap is attached to the upper side of the attachment portion connected to the third flap. Ori,
A foldable packaging box in which the first flap and the third flap are provided with a regulating portion that regulates the rotation of the sticking portion in a direction away from the first flap or the third flap. The first flap and the restricting portion of the third flap are convex portions protruding from the second folding curve.
The foldable packaging box according to claim 1, wherein the sticking portion is formed with a concave portion that is recessed in the direction opposite to the direction in which the convex portion protrudes from the second folding curve. The foldable packaging box according to claim 2, wherein the convex portion and the concave portion have complementary shapes. On the side of the first side plate of the attachment portion connected to the first flap, an inclined edge inclined in a direction away from the first side plate is formed, and at the same time, an inclined edge is formed.
Any one of claims 1 to 3 , wherein an inclined edge inclined in a direction away from the third side plate is formed on the third side plate side of the attachment portion connected to the third flap. Foldable packaging box as described in. On the side of the first side plate of the second flap, an inclined edge is formed which is inclined at the same inclination angle as the inclined edge of the attachment portion connected to the first flap.
Wherein the fourth and the third side plate of the flap, the inclined edges inclined at the same inclination angle as the inclined edge of the adhesive portion provided continuously to said third flap is formed, according to claim 4 Folding packaging box. The tips of the first flap and the third flap overlap each other, and the tips of the first flap and the third flap overlap each other.
The foldable wrapping according to any one of claims 1 to 5 , wherein at least one of the tip of the first flap and the tip of the third flap has a notch formed by inserting the other. box. A square cylindrical outer wall having a first side plate, a second side plate, a third side plate, and a fourth side plate, which are continuous in order through the first folding curve, respectively.
It has a first flap, a second flap, a third flap, and a fourth flap that protrude inward from the lower edge of the first side plate, the second side plate, the third side plate, and the fourth side plate, respectively. It is provided with a square bottom wall that closes the bottom of the outer peripheral wall.
The second flap and the fourth flap side of the second flap and the fourth flap side of the third flap are connected to the second flap and the second flap via a second folding curve extending from a corner of the bottom wall toward the center. 3 Folded sticking parts are connected to the upper side of the flaps.
The first flap is attached to the upper side of the attachment portion connected to the second flap, and the fourth flap is attached to the upper side of the attachment portion connected to the third flap. Ori,
A foldable packaging box in which the second flap and the third flap are provided with a regulating portion that regulates the rotation of the sticking portion in a direction away from the second flap or the third flap. Each has a first side plate, a second side plate, a third side plate, and a fourth side plate that are continuous in order via a first folding curve, and the first side plate and the fourth side plate are arranged on the same plane, and the first side plate and the fourth side plate are arranged in the same plane. An outer peripheral wall in which the second side plate and the third side plate are arranged on the same plane on one side of the first side plate and the fourth side plate.
The first side plate, the second side plate, the third side plate, and the lower edge of the fourth side plate have continuous first flaps, second flaps, third flaps, and fourth flaps, respectively, and the first flap. The flap and the second flap are bent and arranged between the first side plate and the second side plate, and the third flap and the fourth flap are bent and arranged between the third side plate and the fourth side plate. With a bottom wall
The side of the first flap opposite to the fourth flap and the side of the third flap opposite to the second flap are oriented away from the lower end of the first folding curve with respect to the first folding curve. Adhesive parts protruding through the extending second folding curve are connected in series.
The second flap is attached to the attachment portion connected to the first flap, and the fourth flap is attached to the attachment portion connected to the third flap.
Wherein the first flap and the third flap, by the second cutting line beyond the fold line is provided so as to extend into the bond portion, regulating portion for regulating the folding along the second folding line is A foldable packaging box provided. Each has a first side plate, a second side plate, a third side plate, and a fourth side plate that are continuous in order via a first folding curve, and the first side plate and the fourth side plate are arranged on the same plane, and the first side plate and the fourth side plate are arranged in the same plane. An outer peripheral wall in which the second side plate and the third side plate are arranged on the same plane on one side of the first side plate and the fourth side plate.
The first side plate, the second side plate, the third side plate, and the lower edge of the fourth side plate have continuous first flaps, second flaps, third flaps, and fourth flaps, respectively, and the first flap. The flap and the second flap are bent and arranged between the first side plate and the second side plate, and the third flap and the fourth flap are bent and arranged between the third side plate and the fourth side plate. With a bottom wall
The side of the second flap opposite to the third flap and the side of the third flap opposite to the second flap are oriented away from the lower end of the first folding curve with respect to the first folding curve. Adhesive parts protruding through the extending second folding curve are connected in series.
The first flap is attached to the attachment portion connected to the second flap, and the fourth flap is attached to the attachment portion connected to the third flap.
Wherein the second flap and the third flap, by the second cutting line beyond the fold line is provided so as to extend into the bond portion, regulating portion for regulating the folding along the second folding line is A foldable packaging box provided.

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