JP2019214416A - Packaging box - Google Patents

Abstract

To improve a box-manufacturing precision by eliminating the effect of corrugations of a corrugated cardboard sheet.SOLUTION: A packaging box 10 includes: a bottom plate 21; an end plat 22 and a side plate 24 erected on the bottom plate 21; a frame plate 26 continuous to one of the end plate 22 and the side plate 24 and fixed to an inner surface of the other; a folded plate 28 connected to the frame plate 26 and fixed to an inner surface of the frame plate 26; a first reinforcing plate 32 connected to the folded plate 28; a second reinforcing plate 34 continuous to the first reinforcing plate 32; and an inner plate 36 connected to the second reinforcing plate 34 and fixed to an inside surface of the end plate 22. A first bent part (bending line 27) between the end plate 22 and the frame plate 26 extends parallel to a corrugation direction of a corrugated cardboard sheet 1, and a second bent part (bending line 29) between the frame plate 26 and the folded plate 28 extends in a direction crossing the corrugation direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a packaging box.

  In the packaging box disclosed in Patent Document 1, reinforcing columns are formed at the corners of the outer peripheral wall in order to improve the pressure resistance when stacked. This packing box is made of a corrugated cardboard sheet in which a wavy middle shin is arranged between the front liner and the back liner, and the reinforcing column is in the step direction (the direction in which the middle shin steps (concave and convex strips extend)). It is matched with the extending direction.

  The reinforcing column of Patent Literature 1 is formed in a triangular cylindrical shape in plan view by an end plate or a side plate constituting the outer peripheral wall, a first reinforcing plate, and a second reinforcing plate. Specifically, a frame plate attached to the inner side surface of the side plate is continuously provided on the end plate, and a folded plate is continuously provided at the tip of the frame plate. The first reinforcing plate is provided continuously at the tip of the folded plate, and the second reinforcing plate is provided continuously at the tip of the first reinforcing plate. Further, a fixing plate is continuously provided at the tip of the second reinforcing plate, and the fixing plate is attached to the inner surface of the end plate.

Japanese Patent No. 5782577

  In the packaging box of Patent Literature 1, in order to form a reinforcing column, a frame plate, a folded plate, a first reinforcing plate, a second reinforcing plate, and a fixing plate are sequentially provided via a folding curve in this order. . Since each folding curve is provided in parallel with the step direction of the corrugated cardboard sheet, there is a possibility that the folding may occur at a portion other than the folding curve due to the influence of the step at the time of box making.

  SUMMARY OF THE INVENTION It is an object of the present invention to improve the accuracy of box production by eliminating the influence of the steps of a corrugated cardboard sheet in a packaging box provided with reinforcing columns.

  A first aspect of the present invention is a corrugated cardboard having a front liner, a back liner positioned at an interval from the front liner, and a middle lining arranged between the front liner and a plurality of concave and convex ridges that are continuous in a wave shape. A packaging box made of a sheet, a bottom plate having a first side, a second side extending in a direction intersecting with the first side, a first side plate erected on the first side, and the second side plate. A second side plate erected on the side, and a first bent portion which is continuous with the first side plate and extends in a direction intersecting with the first side, is bent, and is fixed to an inner surface of the second side plate. Frame plate and a second bent portion extending along the first bent portion, the frame plate is connected to the frame plate, is bent along the second bent portion, and is provided on an inner surface of the frame plate. The fixed folded plate is connected to the folded plate via a third folded portion extending along the second folded portion, and is connected to the third folded portion. A first reinforcing plate which is bent at a distance inside the first side plate and a fourth bending portion which is continuous with the first reinforcing plate and extends along the third bending portion. A second reinforcing plate bent along the first side plate along the first side plate, and a fifth bending portion extending along the fourth bending portion, the second reinforcing plate being connected to the second reinforcing plate, the fifth reinforcing plate being connected to the second reinforcing plate. An inner plate which is bent along a curved portion and is fixed to an inner surface of the first side plate, wherein a step direction of the corrugated cardboard sheet, which is a direction in which the concave streak and the convex streak of the inner shin extend, The first bent portion extends in a vertical direction along the frame plate, the first bent portion extends in parallel with the step direction, and the second bent portion extends in a direction crossing the step direction. Provide packaging boxes.

  When manufacturing the packaging box, the folded plate is folded back along the second bent portion with respect to the frame plate, and the folded plate is fixed to the frame plate, and the inner plate is fixed to the first side plate. . Subsequently, by folding the frame plate along the first bent portion with respect to the first side plate, the third bent portion, the fourth bent portion, and the fifth bent portion are bent in conjunction with each other, and between them. The first reinforcing plate and the second reinforcing plate are projected inward. Thereafter, after the first side plate is bent with respect to the bottom plate, the second side plate is bent with respect to the bottom plate, and the second side plate is fixed to the frame plate, whereby the packaging box is manufactured.

  When the folded plate is folded over the frame plate, the second bent portion extends in a direction intersecting the step direction of the corrugated cardboard sheet, so that the second bent portion extends along the second bent portion without being affected by the step. Can be reliably bent. Therefore, since the folded plate and the inner plate can be fixed to the determined positions with respect to the frame plate and the first side plate, respectively, the box making accuracy can be improved. Further, when forming a folding curve constituting the second bent portion during blanking, it is possible to suppress the front liner or the back liner located on the opposite side of the rule from being pulled and torn (vibration cracking). And the suitability for production can be improved.

  The third bent portion intersects the step direction and extends in parallel with the first bent portion.

  The third bent portion, the fourth bent portion, and the fifth bent portion extend in parallel with each other. In this case, the angle formed by the third bent portion and the upper side of the first reinforcing plate is a right angle, and the angle formed by the fourth bent portion and the upper side of the second reinforcing plate is a right angle. The upper side of the first reinforcing plate and the upper side of the second reinforcing plate are located on a plane parallel to the bottom plate. According to this aspect, the reinforcing column including the first side plate, the first reinforcing plate, and the second reinforcing plate can be formed in a polygonal cylindrical shape extending in a direction orthogonal to the bottom plate. Therefore, the vertical pressure resistance of the packaging box can be effectively improved. Further, since the folded plate, the first reinforcing plate, and the second reinforcing plate have the upper sides located on a straight line, the shape of the blank constituting the packaging box can be simplified, and the blank punching property can be improved.

  Each of the frame plate and the folded plate has a stepped portion extending in a band shape adjacent to the second bent portion, and the pair of the stepped portions is viewed from a direction in which the stepped portion extends. Therefore, it is depressed so that one of the front liner and the back liner becomes gradually narrower toward the other. According to this aspect, it is possible to reduce resistance when the folded plate is bent 180 degrees with respect to the frame plate along the second bent portion (folded curve). Further, since the stepped portion has a tapered shape that is depressed so as to be gradually narrowed, a minimum stepped amount required for bending can be secured, and a decrease in compressive strength due to the stepped down can be suppressed.

  An upper side of the frame plate is shorter than a lower side of the frame plate, and the folded plate has a similar shape smaller than the frame plate. Alternatively, the upper side of the frame plate is longer than the lower side of the frame plate, and the folded plate has a similar shape smaller than the frame plate. The similar shape here includes not only a strict similar shape but also a shape that can be regarded as substantially similar.

  The frame plate is continuous with the first side plate via a chamfer plate extending in a direction intersecting the first side plate and the frame plate. Thus, the plan view shape of the packaging box is not limited to a square shape, and may be an octagonal shape.

  Further, a second aspect of the present invention provides a front liner, a back liner positioned at an interval from the front liner, and a middle lining in which a plurality of concave and convex ridges are arranged in a wavy manner. A packaging box made of a cardboard sheet having a bottom plate having a first side, a second side extending in a direction intersecting the first side, a first side plate erected on the first side, A second side plate erected on a second side and a first bent portion that is continuous with the first side plate and extends in a direction crossing the first side is bent along an inner surface of the second side plate. The frame plate is fixed to the frame plate via a second bent portion extending along the first bent portion, and is connected to the frame plate, bent along the second bent portion, and separated from the frame plate. A first reinforcing plate inclined so as to approach the first side plate in accordance with A second reinforcing plate bent toward the first side plate along a third bent portion extending along the third bent portion, and the second reinforcing plate via a fourth bent portion extending along the third bent portion And an inner plate that is bent along the fourth bent portion and is fixed to an inner surface of the first side plate, in a direction in which the concave streak and the convex streak of the inner shin extend. The step direction of the corrugated cardboard sheet extends vertically along the frame plate, the first bent portion extends in parallel with the step direction, and the second bent portion extends in the step direction. Providing a packaging box extending in a crossing direction. As in the second embodiment, even when there is no folded plate between the frame plate and the first reinforcing plate, the same operation as in the first embodiment can be achieved by providing the second bent portion in a direction intersecting the step direction. And effects can be obtained.

  In the packaging box of the present invention, when the first reinforcing plate side is folded with respect to the frame plate, the second bent portion extends in a direction intersecting the step direction of the corrugated cardboard sheet. Therefore, it can be reliably bent along the second bent portion. Therefore, the box making accuracy can be improved.

FIG. 2 is an exploded perspective view of the packaging box according to the first embodiment of the present invention. Sectional drawing which shows the reinforcement pillar of the box main body of FIG. The top view which shows the blank of the box main body of FIG. The top view which shows the blank of the lid of FIG. Sectional drawing of a cardboard sheet. Sectional drawing of the cardboard sheet provided with the general-purpose ruled line. Sectional drawing of the cardboard sheet provided with the reverse ruled line. Sectional drawing of the cardboard sheet provided with the cutting line. Sectional drawing of the corrugated-cardboard sheet provided with the corrugated part. FIG. 2 is a bottom view showing the assembling process of the box body in FIG. 1. The perspective view which shows the opening process of the packaging box of FIG. FIG. 2 is a perspective view showing an opened state of the packaging box of FIG. 1. The exploded perspective view of the packaging box concerning a 2nd embodiment. Sectional drawing which shows the reinforcement pillar of the box main body of 2nd Embodiment. FIG. 10B is a partial cross-sectional view of a portion different from FIG. 10A. The top view which shows the blank of the box main body of FIG. The top view which shows the blank of the lid of FIG. FIG. 10 is an exemplary perspective view showing the assembling process of the box body in FIG. 9; The exploded perspective view of the packaging box concerning a 3rd embodiment. Sectional drawing which shows the reinforcement pillar of the box main body of FIG. The exploded perspective view of the packaging box concerning a 4th embodiment. The perspective view of the packaging box concerning a 5th embodiment. FIG. 14 is an upper perspective view of a packaging box according to a sixth embodiment. FIG. 19 is a lower perspective view of the packaging box of FIG. 18. The disassembled perspective view of the packaging box of FIG. FIG. 22 is a perspective view showing a part of the box body of FIG. 21. The top view which shows the blank of the box main body of FIG. The perspective view of the packaging box concerning a 7th embodiment. FIG. 24 is a sectional view showing a reinforcing column of the packaging box of FIG. 23. The top view which shows the blank of the packaging box of FIG.

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

(First embodiment)
FIG. 1 shows a packaging box 10 according to a first embodiment of the present invention. In the packaging box 10, a predetermined article is stored inside a bottomed cylindrical box body 20, and the upper end of the box body 20 is closed by a separate lid 50. Referring also to FIG. 2, in order to improve the pressure resistance when the packaging boxes 10 are stacked, four corners of the box main body 20 are provided with rectangular tubular reinforcing columns 31 extending vertically. In the present embodiment, the box making accuracy of the box body 20 including the reinforcing columns 31 is improved.

  The box main body 20 is formed by bending and attaching one blank shown in FIG. 3 at a predetermined portion. The cover 50 is formed by bending a single blank shown in FIG. These blanks are formed by punching a cardboard sheet 1 made of paper by a well-known paper punching device.

  As shown in FIG. 5A, the corrugated cardboard sheet 1 includes a front liner 2, a back liner 3 located at an interval from the front liner 2, and a wavy middle shim 4 disposed therebetween. The inner shin 4 has a corrugated plate shape in which a plurality of concave ridges 4a and convex ridges 4b are alternately continued. In the following description, the cut surface shown in FIG. 5A in which the inner shin 4 looks wavy is referred to as a step, and a direction perpendicular to the paper surface in FIG. 5A in which the concave ridge 4a and the convex ridge 4b extend may be referred to as a step direction. The step direction extends vertically in the state shown in FIG. 3 for the blank of the box body 20, and extends horizontally in the state shown in FIG. 4 for the blank of the lid 50.

  3 and 4 is a general ruled line in which the thickness of the corrugated cardboard sheet 1 is partially reduced by inserting a rule 6 (see FIG. 5E) from the back liner 3 as shown in FIG. 5B. The two-dot chain line in FIG. 3 is a reverse ruled line in which a ruled line 6 is inserted from the front liner 2 to partially reduce the thickness of the corrugated cardboard sheet 1, as shown in FIG. 5C. The solid line in FIG. 3 and FIG. 4 is a cutting line obtained by partially cutting the corrugated cardboard sheet 1 by inserting a blade from the back liner 3 to the front liner 2 as shown in FIG. 5D. As shown in FIG. 5E, the cross-hatched portion in FIG. 3 is compressed by a cork 7 or the like from one of the back liner 3 and the front liner 2 to the other to partially reduce the thickness of the corrugated cardboard sheet 1. It is a step collapsed part. FIG. 5E shows a state where the back liner 3 is compressed. The width of the stepped portion in a direction perpendicular to the extending direction is wider than the width of the general ruled line or the inverted ruled line in the same direction.

(Outline of the box body)
As shown in FIGS. 1 and 3, the box body 20 includes a rectangular bottom plate 21. On the bottom plate 21, end plates (first side plates) 22 are respectively erected on a pair of opposing short sides (first sides), and side plates (long sides) extending in a direction orthogonal to the short sides (second sides). Second side plates) 24 are erected. The end plate 22 has a rectangular shape whose vertical dimension is longer than the horizontal dimension. The side plate 24 has a rectangular shape whose vertical dimension is shorter than the horizontal dimension. The overall height of the end plate 22 of the present embodiment is higher than the overall height of the side plate 24.

  Referring to FIG. 3, the bottom plate 21 is disposed at the center, the end plates 22 are respectively connected to short sides located at upper and lower sides via bent curves 23, and the side plates are located at left and right longer sides via bent curves 25. 24 are connected in series. The folding curves 23 and 25 are each composed of general-purpose ruled lines. The blank of the box body 20 is punched out so that the stepped direction of the corrugated cardboard sheet 1 extends from one of the pair of end plates 22 to the other.

  As shown in FIG. 1, a frame plate 26 is continuously provided on both sides of the end plate 22, and a side plate 24 is attached to an outer surface of the frame plate 26. As a result, the end plate 22 and the side plate 24 are held in an upright state bent with respect to the bottom plate 21. The frame plate 26 is continuously provided on both sides of the end plate 22 via a folding curve 27, and is bent with respect to the end plate 22 along the inner surface of the side plate 24. The folding curve 27 is formed of a general ruled line, and extends in parallel along the step direction of the cardboard sheet 1.

  Referring also to FIG. 3, the frame plate 26 has an upper side 26a shorter than the lower side 26b, an angle between the upper side 26a and the fold curve 27 is a right angle, and an angle between the lower side 26b and the fold curve 27 is also a right angle. It is a right angle trapezoidal shape. In the assembled state, the bent curve 27 forms a first bent portion of the first embodiment of the present invention, which extends in a direction orthogonal to the bent curve 23 (first side) of the bottom plate 21.

(Overview of reinforcing columns)
As shown in FIGS. 1 and 2, reinforcing columns 31 extending from the vicinity of the lower end to the vicinity of the upper end of the end plate 22 are formed on both inner surfaces of the end plate 22. The reinforcing column 31 is formed in a substantially triangular cylindrical shape by a part of the end plate 22, the first reinforcing plate 32, and the second reinforcing plate. In order to form the reinforcing column 31 integrally with the box body 20, a folded plate 28 is continuously provided on the frame plate 26, and a first reinforcing plate 32 is continuously provided on the folded plate 28. Further, an inner plate 36 is connected to a second reinforcing plate 34 connected to the first reinforcing plate 32.

  Referring to FIG. 3, the folded plate 28, the first reinforcing plate 32, the second reinforcing plate 34, and the inner plate 36 are sequentially connected outward from the frame plate 26 in this order. The folding plate 28 is connected to the frame plate 26 via a folding curve 29, and the folding curve 29 forms a second bent portion of the first embodiment of the present invention. The first reinforcing plate 32 is connected to the folded plate 28 via a folding curve 33, and the folding curve 33 forms a third bent portion of the first embodiment of the present invention. The second reinforcing plate 34 is connected to the first reinforcing plate 32 via a bending curve 35, and the bending curve 35 forms a fourth bent portion of the first embodiment of the present invention. The inner plate 36 is connected to the second reinforcing plate 34 via a fold curve 37, and the fold curve 37 forms a fifth bent portion of the first embodiment of the present invention.

  As shown in FIG. 1 and FIG. 2, the folded plate 28 is continuously provided at the front end of the frame plate 26 located at the center in the width direction of the side plate 24. The folded plate 28 is bent 180 degrees with respect to the frame plate 26 along a folding curve 29 formed of a general ruled line, and is adhered (fixed) to the inner surface of the frame plate 26. Referring to FIG. 3, the bent curve (second bent portion) 29 extends along the bent curve (first bent portion) 27 and is inclined in a direction intersecting the step direction of the cardboard sheet 1. . In other words, the term “extending along the folding curve 27” as used herein includes a state that is slightly inclined with respect to the folding curve 27.

  FIG. 6 shows a state in which the folded plate 28, the first reinforcing plate 32, the second reinforcing plate 34, and the inner plate 36 are folded along the folding curve 29 with respect to the frame plate 26. Referring to FIG. 6, the folded plate 28 has a shape substantially line-symmetric with respect to the frame plate 26 with the folding curve 29 as an axis. Specifically, the folded plate 28 has an upper side 28a shorter than the lower side 28b, an angle between the upper side 28a and the folding curve 33 is a right angle, and an angle between the lower side 28b and the folding curve 33 is also a right angle trapezoidal shape. It is.

  More specifically, the folded plate 28 has a similar shape smaller than the frame plate 26. Here, the similar shape includes not only a strict similar shape but also a shape that can be regarded as substantially similar. 3, the angle between the upper side 26a of the frame plate 26 and the folding curve 29, the angle between the upper side 28a of the folding plate 28 and the folding curve 29, and the angle between the lower side 26b of the frame plate 26 and the folding curve 29. The angle formed and the angle formed by the lower side 28b of the folding plate 28 and the folding curve 29 are all the same. 6, when folded, the upper side 28a of the folded plate 28 overlaps the upper side 26a of the frame plate 26, and the lower side 28b of the folded plate 28 overlaps the lower side 26b of the frame plate 26.

  With continued reference to FIG. 6, the maximum width of the folded plate 28 is smaller than the maximum width of the frame plate 26, and the bent curve (third bent portion) 33 located at the tip of the folded plate 28 is formed by the base of the frame plate 26. It is positioned parallel to the end bending curve (first bending portion) 27 with a predetermined interval D. That is, the folding curve 33 is offset from the folding curve 27 with an interval D. The interval D is larger than the thickness of the cardboard sheet 1. As a result, as shown in FIG. 2, it is prevented that the third bent portion, which is the portion where the bent curve 33 is formed, interferes with the end plate 22 and hinders the bending of the frame plate 26 with respect to the end plate 22. .

  Referring to FIG. 3, stepped portions 30 a and 30 b extending in a band shape are formed on the frame plate 26 and the folded plate 28 so as to be adjacent to the folding curve 29. Referring to FIG. 5E, the stepped portions 30a and 30b are formed in a tapered shape that gradually narrows from the back liner 3 toward the front liner 2 when viewed from the direction in which the stepped portions 30a and 30b extend. The combined shape of the pair of stepped portions 30a and 30b is a generally isosceles triangle having a low overall height.

  As shown in FIG. 1 and FIG. 2, the first reinforcing plate 32 is continuously provided at the end of the folded plate 28 located outside the side plate 24 in the width direction. The first reinforcing plate 32 is bent inward along a folding curve 33 formed by an inverted ruled line, and is located at an interval from the end plate 22. More specifically, the first reinforcing plate 32 is inclined in a direction away from the end plate 22 as the distance from the folded plate 28 (side plate 24) increases. Referring to FIG. 3, the first reinforcing plate 32 has the same dimension of the upper side 32 a and the lower side 32 b, the angle between the upper side 32 a and the lower side 32 b and the folding curve 33 is a right angle, and the first reinforcing plate 32 is folded at the upper side 32 a and the lower side 32 b. The angle formed with the curve 35 is also a right angle, and is a rectangular shape long in the vertical direction. The fold curve (third bent portion) 33 intersects (inclines) with the step direction of the corrugated cardboard sheet 1 and the fold curve 29 and extends parallel to the fold curve (first bent portion) 27.

  As shown in FIGS. 1 and 2, the second reinforcing plate 34 is continuously provided at the tip of the first reinforcing plate 32 located apart from the end plate 22. The second reinforcing plate 34 is bent outward along a folding curve 35 formed of a general ruled line so as to approach the end plate 22. More specifically, the second reinforcing plate 34 is inclined so as to approach the end plate 22 as the distance from the folded plate 28 (the side plate 24) increases. Referring to FIG. 3, the second reinforcing plate 34 has the same dimension of the upper side 34 a and the lower side 34 b, and the angle between the upper side 34 a and the lower side 34 b and the folding curve 35 is a right angle, and the second reinforcing plate 34 is folded at the upper side 34 a and the lower side 34 b. The angle formed with the curve 37 is also a right angle, and is a rectangular shape long in the vertical direction. The bent curve (fourth bent portion) 35 intersects (inclines) with the step direction of the corrugated cardboard sheet 1 and extends parallel to the bent curve (third bent portion) 33.

  The inner plate 36 is connected to the end of the second reinforcing plate 34 located at the center in the width direction of the end plate 22. The inner plate 36 is bent with respect to the second reinforcing plate 34 along a folding curve 37 formed by an inverted ruled line, and is adhered (fixed) to the inner surface of the end plate 22. The folding curve (fifth bending portion) 37 intersects (inclines) with the step direction of the corrugated cardboard sheet 1 and extends parallel to the folding curve (fourth bending portion) 35.

  Referring to FIG. 3, since the folded plate 28 has a similar shape to the frame plate 26, the upper side 28a of the folded plate 28 is inclined with respect to the upper side 26a of the frame plate 26, and the lower side 28b of the folded plate 28 is 26 is inclined with respect to the lower side 26b. The upper sides 32a, 34a, 36a of the first reinforcing plate 32, the second reinforcing plate 34, and the inner plate 36 are formed so as to be located on a straight line with respect to the upper side 28a of the folded plate 28. Further, the lower sides 32b, 34b, 36b of the first reinforcing plate 32, the second reinforcing plate 34, and the inner plate 36 are formed so as to be located on a straight line with respect to the lower side 28b of the folded plate 28.

  As described above, the angle formed by the upper side 32a of the first reinforcing plate 32 and the bending curve (third bent portion) 33, and the upper side 34a of the second reinforcing plate 34 and the bending curve (fourth bent portion) 35 The angle between the lower side 32b of the first reinforcing plate 32 and the bent curve 33 and the angle between the lower side 34b of the second reinforcing plate 34 and the bent curve 35 are also right angles. In the present embodiment, the angle formed by the upper side 36a of the inner plate 36 and the fold curve (the fifth bent portion) 37 and the angle formed by the lower side 36b of the inner plate 36 and the fold curve 37 are also right angles. That is, the three fold curves 33, 35, and 37 are formed so as to extend in parallel.

  Thereby, as shown in FIGS. 1 and 6, the upper sides 32 a, 34 a, 36 a of the first reinforcing plate 32, the second reinforcing plate 34, and the inner plate 36 are respectively located below the upper side 22 a of the end plate 22. . The lower sides 32b, 34b, 36b of the first reinforcing plate 32, the second reinforcing plate 34, and the inner plate 36, respectively, are located above the lower side 22b of the end plate 22. The upper sides 32a, 34a, 36a of the first reinforcing plate 32, the second reinforcing plate 34, and the inner plate 36, respectively, are located on a plane parallel to the bottom plate 21. As a result, the reinforcing column 31 extends substantially in a triangular cylindrical shape from the lower end to the upper end of the end plate 22.

  Referring to FIG. 3, the frame plate 26, the folded plate 28, the first reinforcing plate 32, the second reinforcing plate 34, and the inner plate 36 connected to the end plate 22 are inclined in a direction away from the side plate 24 as a whole. are doing. In the present embodiment, when the blank of the box body 20 is punched, in order to prevent generation of useless punching waste, the blank is punched out so that the outer end of the inner plate 36 and the outer end of the side plate 24 are located on a straight line. ing. Thus, the inner plate 36 has a trapezoidal shape with the upper side 36a longer than the lower side 36b.

  When assembling the box body 20, as shown in FIG. 6, the folded plate 28 is folded along the folding curve 29 with respect to the frame plate 26, and the folded plate 28 is folded with an adhesive such as a vinyl acetate emulsion. 26, and the inner plate 36 is attached to the end plate 22 (first step). Subsequently, by folding the frame plate 26 along the folding curve 27 with respect to the end plate 22, the folding curves 33, 35, and 37 are folded in conjunction with each other, and the first reinforcing plate 32 and the second The reinforcing plate 34 is made to protrude inward (second step). Then, after bending the end plate 22 with respect to the bottom plate 21, the side plate 24 is bent with respect to the bottom plate 21, and the side plate 24 is stuck on the frame plate 26 (third step).

  When the folded plate 28 is folded over the frame plate 26 (first step), since the folded curve 29 extends in a direction intersecting the stepped direction of the cardboard sheet 1, the folded curve is not affected by the step. 29 can be reliably bent. Therefore, the folded plate 28 and the inner plate 36 can be adhered to the frame plate 26 and the end plate 22 at predetermined positions, respectively, so that the accuracy of box making can be improved.

  Moreover, since the stepped portions 30a and 30b extending in a band shape are formed adjacent to the folding curve 29, the resistance when the folded plate 28 is bent 180 degrees with respect to the frame plate 26 along the folding curve 29 can be reduced. . Further, since the stepped portions 30a and 30b are tapered so as to be gradually narrowed, a minimum amount of stepping required for bending can be secured, and a decrease in compressive strength due to stepping can be suppressed.

  In a state before the frame plate 26 is bent with respect to the end plate 22, the first reinforcing plate 32, the second reinforcing plate 34, and the inner plate 36 are flatly overlapped with the end plate 22 and the frame plate 26. In this state, since the fold curve 33 is offset from the fold curve 27 by the interval D, when the frame plate 26 is bent against the end plate 22 along the fold curve 27, the fourth bent portion by the fold curve 35 is formed. The reinforcing plates 32 and 34 can be projected inward with the top as a top.

  The upper side 32a, 34a, 36a of each of the first reinforcing plate 32, the second reinforcing plate 34, and the inner plate 36 is located below the upper side 22a of the end plate 22, and the lower sides 32b, 34b, 36b of the end plate 22 respectively. It is located below the lower side 22b. Moreover, these upper sides 32a, 34a, 36a are located on a straight line with the upper side 28a of the folded plate 28, and the lower sides 32b, 34b, 36b are located on a straight line with the lower side 28b of the folded plate 28. Therefore, bendability of the end plate 22 with respect to the bottom plate 21 can be improved, and workability when covering the upper end of the end plate 22 with the lid 50 described later can be improved.

  The fold curve (third fold) 33 is parallel to the fold curve (first fold) 27, and the angle formed by the fold curve 33 and the upper side 32a of the first reinforcing plate 32 is a right angle. The angle between the curve 35 and the upper side 34a of the second reinforcing plate 34 is a right angle. The folding curves 33, 35 and 37 extend in parallel, and the upper sides 32a and 34a of the reinforcing plates 32 and 34 are located on a plane parallel to the bottom plate 21. Therefore, since the reinforcing columns 31 can be formed in a polygonal cylindrical shape extending in a direction perpendicular to the bottom plate 21, the pressure resistance of the packaging box 10 in the vertical direction can be effectively improved.

  At the time of blank punching, since the folding curves 29, 33, 35, and 37 are inclined with respect to the step direction of the corrugated cardboard sheet 1, the front liner 2 or the back liner 3 located on the opposite side of the crease 6 is pulled. Splitting (vibration cracking) can be suppressed. Further, since the upper sides 28a, 32a, 34a of the folded plate 28, the first reinforcing plate 32, and the second reinforcing plate 34 are located on a straight line, the shape of the blank can be simplified. Therefore, the suitability for production can be improved.

(Overview of lid)
As shown in FIG. 1, the lid 50 is formed of an elongated and substantially rectangular sheet, and is attached to one of the pair of side plates 24 of the assembled box main body 20 so as to cover and cover the one from the other. Specifically, the lid body 50 includes, on both sides of the lid body 51 located at the central portion, sticking plates 52 that are stuck to the side plates 24, respectively. The lid 50 is punched from one of the pair of sticking plates 52 to the other so that the stepped direction of the cardboard sheet 1 extends.

  The lid main body 51 has a rectangular shape corresponding to the upper end shape of the box main body 20. The sticking plate 52 is connected to the lid main body 51 via a folding curve 53 composed of a general ruled line. The dimension (total height) of the adhesive plate 52 from the fold curve 53 to the tip of the adhesive plate 52 is larger than the dimension (height of the opening) from the upper end of the end plate 22 of the box body 20 to the upper end of the side plate 24, It is smaller than the overall height of the box body 20. Thereby, the sticking plate 52 overlaps the side plate 24 of the box body 20.

  The lid main body 51 is arranged on the pair of end plates 22, and the bonding plate 52 bent along the folding curve 53 is bonded to the outer side surfaces of the side plate 24 and the frame plate 26, thereby opening the box body 20. Is closed. In order to dispose the lid main body 51 in a stable state on the box main body 20, flaps 39 are respectively connected to the upper end of the end plate 22 via folding curves 40 composed of general ruled lines. Further, a pair of cuts 40 a are provided on the folding curve 40 in order to improve the bendability of the flap 39 with respect to the end plate 22. An adhesive is also applied and adhered to the overlapping portion of the flap 39 and the lid body 51.

(Opening structure of packaging box)
As shown in FIG. 1, in order to bring the packaging box 10 into the unsealed state shown in FIG. 8, the lid 50 is provided with one operation unit 60 and three types of breaks 61 to 63, Is provided with one break portion 64. Further, a notch 65 is provided in the lid 50, and a notch 66 and a pair of auxiliary folding curves 67 are provided in the box body 20. By pulling the operation unit 60 toward one of the side plates 24, as shown in FIG. 7, after the lid 50 has been broken along the break portions 61 to 63, the side plate 24 is subsequently broken along the break portion 64. The packaging box 10 is broken and the packaging box 10 is opened as shown in FIG.

  As shown in FIGS. 1 and 4, the operation section 60 of the lid 50 is provided at the center of the lid main body 51, and has one fold curve 60 a, a pair of first break lines 60 b, and one It is defined by two break lines 60c. The folding curve 60 a is formed of a general-purpose ruled line, and extends along the folding curve 53. The pair of first break lines 60b are cut lines extending in an arc shape along the fold curve 53, and are provided at both ends of the fold curve 60a. The second breaking line 60c is composed of a plurality of cutting lines provided at intervals so as to form a perforation, and is formed in an arc shape from one outer end to the other outer end of the pair of first breaking lines 60b. Is provided.

  The first break portion 61 of the lid 50 is formed of a single zipper, and is provided so as to extend from both ends of the operation portion 60 along the fold curve 53. The one zipper has a plurality of first cutting lines 61a provided at intervals so as to form a perforation, and a second cutting line 61b connected to an end of the first cutting line 61a located on the operation unit 60 side. And The second cutting line 61b is inclined with respect to the first cutting line 61a.

  The second breakable portion 62 of the lid 50 is formed of the same single zipper as the first breakable portion 61, and is provided at both ends of the folding curve 53. The end of the second breaking portion 62 located on the center side in the width direction of the sticking plate 52 is located inside the tip (folding curve 29) of the frame plate 26 of the box body 20.

  The third breaking portion 63 of the lid 50 extends from the end of the second breaking portion 62 located at the center in the width direction of the sticking plate 52 in a direction orthogonal to the folding curve 53. That is, the third break portion 63 is provided inside the front end of the frame plate 26. The third breaking portion 63 is constituted by a plurality of first cutting lines 63a provided at intervals so as to form a perforation, and second cutting lines 63b provided between adjacent first cutting lines 63a. I have. The second cutting line 63b is inclined with respect to the first cutting line 63a.

  The break portion 64 of the box body 20 is formed of a design cut line provided so as to extend in the width direction of the side plate 24. The design cut line comprises a cut line 64a of a predetermined shape in consideration of aesthetics, and a non-cut portion 64b that is not cut remains at a predetermined portion. The upper side of the break portion 64 of the side plate 24 constitutes a separating portion 24a separated together with the lid 50, and the attaching plate 52 of the lid 50 is attached to the separating portion 24a. The total height of the sticking plate 52 is set so as to cover the lower end of the break portion 64.

  The notch portions 65 of the lid 50 are provided on both lower ends of the sticking plate 52 located apart from the lid main body 51. The edge of the cutout portion 65 located on the center side in the width direction of the sticking plate 52 is located on a straight line with respect to the third break portion 63.

  The notches 66 of the box body 20 are provided on both upper ends of the side plate 24 located away from the bottom plate 21. The lower edge of the notch 66 is located at the same height as the upper edge of the notch 65. The break portions 64 are provided such that the ends are respectively located at the lower edges of the pair of cutout portions 66. Further, the edge of the cutout portion 66 located at the center in the width direction of the side plate 24 is located outside the front end (folding curve 29) of the frame plate 26. As a result, in the sealed state, both sides of the separation portion 24a are sandwiched between the frame plate 26 and the attaching plate 52.

  The auxiliary folding curve 67 of the box body 20 is formed of a general-purpose ruled line, and is provided on both upper ends of the separating portion 24a. The pair of auxiliary folding curves 67 are inclined so as to gradually approach from the lower side to the upper side. The lower end of the auxiliary folding curve 67 located on the outermost side in the width direction of the separation portion 24 a is located inside the tip of the frame plate 26.

  When opening the packaging box 10, the operation unit 60 is pressed from above, and the lid main body 51 is broken along the first break line 60b and the second break line 60c to make a hole. By inserting a hand into this hole and pulling it toward one side plate 24, the lid main body 51 is broken along the first breaking portion 61. Even if the lid main body 51 is broken to both ends, by continuing to operate, the adhered portion between the lid main body 51 and the flap 39 is peeled off. Then, after the ridges of the lid main body 51 and the adhesive plate 52 are broken along the second breaking portion 62, the adhesive plate 52 is broken down along the third breaking portion 63.

  Subsequently, since the separation unit 24a is attached to the attachment plate 52, the separation unit 24a is pulled outward. At this time, since both sides of the separating portion 24a are sandwiched between the frame plate 26 and the sticking plate 52, there is a resistance to an operation of pulling outward. However, in the present embodiment, as shown in FIG. 7, the upper end sides of the separation portion 24 a are bent along the auxiliary folding curve 67, whereby the separation portion 24 a is pulled out from between the frame plate 26 and the attaching plate 52. Thereafter, the side plate 24 is broken along the break portion 64, whereby the separating portion 24a is separated, and one side of the packaging box 10 is opened.

  Next, the rest of the lid 50 attached to the box body 20 is removed in the same manner as described above. Thereby, as shown in FIG. 8, the opened state in which the edge of the breakable portion 64 having an aesthetic appearance is exposed can be obtained. In FIG. 8, illustration of both side portions of the sticking plate 52 remaining on the frame plate 26 is omitted.

  As described above, the packaging box 10 of the present embodiment can surely bend the portion constituting the reinforcing column 31 along the folding curve 29 without being affected by the step at the time of box making. Therefore, the box making accuracy can be improved. In addition, since the compressive strength can be improved by the triangular cylindrical reinforcing columns 31, even if the packaging boxes 10 are stacked, they are not crushed.

  The inside of the packaging box 10 can be largely exposed by the broken portions 61 to 64 provided on the lid 50 and the box body 20. Moreover, since the breakable portion 64 of the box body 20 is formed of the design cut line, the appearance in the opened state can be improved, and a sales promotion effect can be obtained.

(Second Embodiment)
FIG. 9 shows a packaging box 10 of the second embodiment. The second embodiment is significantly different from the first embodiment in that the reinforcing columns 31 are provided continuously to the side plates 24. That is, in the box body 20 of the second embodiment, the pair of side plates 24 constitute the first side plate in the first aspect of the present invention, and the pair of end plates 22 constitute the second side plate in the first aspect of the present invention. . In the second embodiment, the packaging box 10 has an octagonal shape in a plan view, the reinforcing columns 31 have a generally rhombic shape in a plan view, and a flap for attaching a lid 50 to the upper end of the box body 20. The first embodiment differs from the first embodiment in that the box body 20 is not provided with an opening structure. Hereinafter, a detailed description of the same configuration as that of the first embodiment will be omitted.

(Outline of the box body)
As shown in FIGS. 9 and 11, the bottom plate 21 has a chamfered side (third side) extending between a short side (bent curve 23) and a long side (bent curve 25) in a direction intersecting these. 21a is an octagonal shape in plan view provided with 21a. An end plate (second side plate) 22 is provided upright on a short side (second side) of the bottom plate 21, and a side plate (first side plate) 24 is provided upright on a long side (first side) of the bottom plate 21. The overall height of the end plate 22 of the second embodiment is lower than the overall height of the side plate 24.

  Between the end plate 22 and the side plate 24, a chamfer plate 42 having the same height as the entire height of the side plate 24 is provided. The chamfered plate 42 corresponds to the chamfered side 21 a of the bottom plate 21 and extends in a direction intersecting the end plate 22 and the side plate 24. Referring to FIG. 10B, a protruding portion 42a is provided below the chamfered plate 42 so as to cover the outside of the chamfered side 21a.

  Referring to FIG. 11, the bottom plate 21 is disposed at the center, the end plates 22 are connected to each other vertically, and the side plates 24 are connected to each other right and left. The blank of the box body 20 of the second embodiment is punched out so that the step direction of the corrugated cardboard sheet 1 extends from one of the pair of side plates 24 to the other. The chamfered plates 42 are continuously provided on both sides of the pair of side plates 24 via folding curves 43 formed of general ruled lines. As shown in FIG. 13, in a state where the folded plate 28 is folded with respect to the frame plate 26, the folded curve 43 is offset at a predetermined interval from the folded curve 35 between the pair of reinforcing plates 32 and 34. Is done.

  As shown in FIGS. 9 and 11, the frame plate 26 is continuous with the side plate (first side plate) 24 via the chamfer plate 42 and is adhered to the inner surface of the end plate (second side plate) 22. . Specifically, the frame plate 26 is connected to the chamfer plate 42 via the folding curve 27 and is bent with respect to the chamfer plate 42 (side plate 24) along the inner side surface of the end plate 22. . The frame plate 26 has a right-angle trapezoidal shape in which the upper side is longer than the lower side, the angle between the upper side and the folding curve 27 is a right angle, and the angle between the lower side and the folding curve 27 is also a right angle. The folding curve 27 extends parallel to the corrugated cardboard sheet 1 along the corrugated direction.

(Overview of reinforcing columns)
As shown in FIGS. 9 and 10A, reinforcing pillars 31 extending from the vicinity of the lower end to the vicinity of the upper end of the side plate 24 are formed on the inner surfaces of both ends of the side plate 24. The reinforcing column 31 is formed in a substantially rectangular cylindrical shape by the chamfer plate 42, a part of the side plate 24, the first reinforcing plate 32, and the second reinforcing plate 34. In order to form the reinforcing columns 31 integrally with the box main body 20, the frame plate 26 is provided with a folded plate 28 in which a first reinforcing plate 32, a second reinforcing plate 34, and an inner plate 36 are sequentially connected in order. .

  FIG. 13 shows a state in which the folded plate 28, the first reinforcing plate 32, the second reinforcing plate 34, and the inner plate 36 are folded along the folding curve 29 with respect to the frame plate 26. Referring to FIG. 13, the folded plate 28 has a substantially line-symmetric shape with respect to the frame plate 26 with the folding curve 29 as an axis. Specifically, the folded plate 28 has a rectangular trapezoidal shape in which the upper side is longer than the lower side, the angle between the upper side and the folding curve 33 is a right angle, and the angle between the lower side and the folding curve 33 is a right angle. It has a similar shape smaller than the plate 26.

  As shown in FIGS. 9 and 13, the first reinforcing plate 32 has a rectangular shape that is long in the up-down direction, is bent inward along the fold curve 33, and is disposed in parallel with the end plate 22 at intervals. Have been. The fold curve (third bent portion) 33 intersects (inclines) with the step direction of the corrugated cardboard sheet 1 and the fold curve 29 and extends parallel to the fold curve (first bent portion) 27.

  The second reinforcing plate 34 has a rectangular shape that is long in the vertical direction, is continuously provided at the tip of the first reinforcing plate 32 that is located apart from the side plate 24, and extends outward along the folding curve 35 so as to approach the side plate 24. It is bent. The bent curve (fourth bent portion) 35 intersects (inclines) with the step direction of the corrugated cardboard sheet 1 and extends parallel to the bent curve (third bent portion) 33.

  The inner plate 36 is continuously provided at the tip of the second reinforcing plate 34 located at the center in the width direction of the side plate 24, is bent along the folding curve 37 with respect to the second reinforcing plate 34, and is formed on the inner surface of the side plate 24. It is stuck. The folding curve (fifth bending portion) 37 intersects (inclines) with the step direction of the corrugated cardboard sheet 1 and extends parallel to the folding curve (fourth bending portion) 35.

  Referring to FIG. 11, since the frame plate 26 and the folded plate 28 have a right-angled trapezoidal shape in which the upper side is longer than the lower side, the chamfered plate 42, the frame plate 26, the folded plate 28, which is provided continuously with the side plate 24, and the first reinforcement The plate 32, the second reinforcing plate 34, and the inner plate 36 are inclined so as to approach the end plate 22 as a whole. Further, when punching a blank of the box body 20, in order to prevent generation of useless punching waste, an outer end of the inner plate 36 continuous with one of the pair of side plates 24 and an outer end of the inner plate 36 continuous with the other. Are punched out so as to be located on a straight line. Thus, the inner plate 36 has a right-angle trapezoidal shape in which the upper side is shorter than the lower side.

  When assembling the box body 20, as shown in FIG. 13, the folded plate 28 is folded along the folding curve 29 with respect to the frame plate 26, and the folded plate 28 is attached to the frame plate 26 and the inner plate 36. Is attached to the end plate 22 (first step). In this state, the side plate 24, the chamfer plate 42, and the frame plate 26 extend flat, and the folded plate 28, the first reinforcing plate 32, the second reinforcing plate 34, and the inner plate 36 flatly overlap with these.

  Subsequently, by bending the chamfered plate 42 along the folding curve 43 with respect to the side plate 24 and bending the frame plate 26 along the folding curve 27 with respect to the chamfering plate 42, the folding curves 33, The pair of reinforcing plates 32 and 34 are bent inward by projecting 35 and 37 (second step). Then, after bending the side plate 24 with respect to the bottom plate 21, the end plate 22 is bent with respect to the bottom plate 21, and the end plate 22 is attached to the frame plate 26 (third step).

  Thereby, similarly to the first embodiment, each component can be bent at a predetermined position (fold curve) without being affected by the step, so that the box making accuracy can be improved. Further, since the reinforcing column 31 is formed in a square cylindrical shape by the chamfered plate 42, a part of the side plate 24, and the pair of reinforcing plates 32, 34, the vertical box pressure resistance of the packaging box 10 can be effectively increased. Can be improved. The box body 20 is octagonal in plan view, and the beveled plate 42 is provided with a protrusion 42a that covers the chamfered side 21a of the bottom plate 21, so that when the beveled plate 42 is bent, the protrusion 42a Since it contacts the chamfered side (third side) 21a of the bottom plate 21 and functions as a guide for bending, the formability can be improved.

(Overview of lid)
As shown in FIGS. 9 and 12, the lid body 50 includes an octagonal lid main body 51 corresponding to the shape of the bottom plate 21 at the center. First sticking plates 52A are respectively connected to both ends of the lid main body 51 via folding curves 55 made of general-purpose ruled lines, and these are stuck to the frame plate 26 exposed on the end plate 22. On both sides of the lid main body 51, second bonding plates 52B are respectively provided continuously via folding curves 53 each formed of a single zipper, and these are bonded to the side plate 24. The chamfered side 51 a located between the folding curves 53 and 55 corresponds to the chamfered plate 42 of the box body 20.

  In order to open the packaging box 10, the lid 50 is provided with one operation part 60 and two kinds of break parts 68 and 53. The box body 20 of the second embodiment does not have a break portion for opening the packaging box 10.

  The operation unit 60 is defined by a pair of cutting lines 60d provided from the tip of the attachment plate 52A toward the folding curve 55. The end of the cutting line 60 d located on the folding curve 55 side is located at a predetermined interval from the folding curve 55.

  The break portion 68 is composed of a plurality of cut lines provided at intervals, extends from one of both ends of the fold curve 55 to the other, and protrudes in an arc shape toward the pair of cut lines 60d. The protruding top of the break portion 68 is configured to pass through the ends of the pair of cutting lines 60d located on the folding curve 55 side.

  The fold curve 53 composed of a single zipper also has a function of breaking the lid body 51 with respect to the sticking plate 52B, and extends from the end of the lid body 51 where the sticking plate 52A is located toward the center.

  When opening the packaging box 10, one operation part 60 of the pair of sticking plates 52A is gripped and pulled toward the other. Thus, after the adhesive plate 52A is broken along the breaking portion 68, the lid body 51 is broken along a pair of fold curves 53 having the function of the breaking portion. Thereby, the packaging box 10 is opened. When it is difficult to break the entire lid main body 51 by one operation, the entire operation of the other operation unit 60 allows the entire lid main body 51 to be broken.

  In the packaging box 10 according to the second embodiment, the same operation and effect as those of the first embodiment can be obtained. Further, since the packaging box 10 is formed in an octagonal shape in plan view, the appearance can be improved.

(Third embodiment)
14 and 15 show a packaging box 10 according to the third embodiment. This packaging box 10 has the same basic structure as the packaging box 10 of the first embodiment. In the third embodiment, similarly to the second embodiment, the packaging box 10 is formed in an octagonal shape in plan view, the reinforcing column 31 is formed in a rectangular cylindrical shape in plan view, and the lid 50 is attached to the end plate 22. The second embodiment differs from the first embodiment in that no flap to be attached is provided and the box body 20 is not provided with an opening structure. Hereinafter, a detailed description of the same configuration as that of the first embodiment will be omitted.

(Outline of the box body)
The bottom plate 21 has an octagonal shape in plan view including a chamfered side (third side) 21a extending in a direction intersecting between the short side (bent curve 23) and the long side (bent curve 25). An end plate (first side plate) 22 is provided upright on a short side (first side) of the bottom plate 21, and a side plate (second side plate) 24 is provided upright on a long side (second side) of the bottom plate 21.

  Between the end plate 22 and the side plate 24, a chamfer plate 42 having the same height as the entire height of the end plate 22 is provided. The chamfered plate 42 corresponds to the chamfered side 21 a of the bottom plate 21 and extends in a direction intersecting the end plate 22 and the side plate 24. A projecting portion 42a is provided at a lower portion of the chamfering plate 42 so as to cover the outside of the chamfered side 21a.

  The frame plate 26 is continuous with the end plate (first side plate) 22 via the chamfer plate 42 and is adhered to the inner surface of the side plate (second side plate) 24. The frame plate 26 is connected to the end plate 22 via a folding curve 27 and is bent with respect to the end plate 22 along the inner surface of the side plate 24. As in the second embodiment, the frame plate 26 of the third embodiment has an upper side longer than the lower side, an angle between the upper side and the folding curve 27 is a right angle, and an angle between the lower side and the folding curve 27 is also a right angle. It has a right-angled trapezoidal shape.

(Overview of reinforcing columns)
The reinforcing columns 31 formed on the inner surfaces of both ends of the end plate 22 are formed into a flat rectangular tube shape by the chamfer plate 42, a part of the end plate 22, the first reinforcing plate 32, and the second reinforcing plate 34. I have. The folded plate 28 in which the first reinforcing plate 32, the second reinforcing plate 34, and the inner plate 36 are successively arranged is connected to the frame plate 26.

  The folded plate 28 has an upper side longer than the lower side, an angle between the upper side and the folding curve 33 is a right angle, and an angle between the lower side and the folding curve 33 is also a right angle trapezoidal shape, which is smaller than the frame plate 26. It has a similar shape.

  The widths of the first reinforcing plate 32 and the second reinforcing plate 34 are each smaller than the width of the chamfered plate 42, and the total width of the first reinforcing plate 32 and the second reinforcing plate 34 is smaller than the width of the chamfered plate 42. Is also wide. By setting the dimensions in this way, as shown in FIG. 15, the reinforcing columns 31 can be formed in a form in which the reinforcing plates 32 and 34 respectively project inward from the vicinity of both ends of the chamfered plate 42.

  The inner plate 36 is formed in a substantially rectangular shape that is long in the up-down direction by chamfering a part of a side on the center side in the width direction of the end plate 22.

(Overview of lid)
The lid body 50 has an octagonal lid body 51 corresponding to the shape of the bottom plate 21 at the center, as in the second embodiment. First sticking plates 52A are respectively provided on both sides of the lid main body 51, and second sticking plates 52B are respectively provided on both sides of the lid main body 51. The first attaching plate 52A is attached to an upper portion of the end plate 22, and the second attaching plate 52B is attached to an upper portion of the side plate 24.

  In order to open the packaging box 10, in addition to the same operation unit 60, the first break part 61, the second break part 62, the third break part 63, and the notch part 65 as in the first embodiment, A fold curve 55 having a function of a break portion is provided. The folding curve 55 is formed of a single zipper.

  In the packaging box 10 of the third embodiment described above, the same operation and effect as those of the first embodiment can be obtained, and the appearance can be improved similarly to the second embodiment. In addition, as in the second embodiment, even in the basic structure in which the reinforcing columns 31 are connected to the side plates 24, the reinforcing plates 32 and 34 may project inward from the vicinity of both ends of the chamfered plate 42, respectively. Good.

(Fourth embodiment)
FIG. 16 shows a packaging box 10 of the sixth embodiment. This packaging box 10 has the same basic structure as the packaging box 10 of the second embodiment. In the fourth embodiment, a flap 39 for attaching the lid 50 to the side plate 24 is provided, the frame plate 26 and the folded plate 28 are formed into a rectangular trapezoid having a lower side shorter than an upper side, and the attachment shown in FIG. The difference from the second embodiment is that the plate 52B is not provided on the lid 50. And in the packaging box 10 of the fourth embodiment, the same operation and effect as the second embodiment can be obtained.

(Fifth embodiment)
FIG. 17 shows a packaging box 10 of the fifth embodiment. This packaging box 10 has the same basic structure as the packaging box 10 of the second embodiment. The fifth embodiment differs from the second embodiment in that the flaps 70 and 72 constituting the lid 50 are provided integrally, and the frame plate 26 and the folded plate 28 are formed into a right-angled trapezoid having a lower side shorter than the upper side. Different.

  The lid body 50 includes an inner flap 70 connected to the end plate 22 and an outer flap 72 connected to the side plate 24. The inner flap 70 is connected to the upper end of the end plate 22 via a folding curve 71 formed of a general ruled line. The outer flap 72 is connected to the upper end of the side plate 24 via a folding curve 73 formed of a general ruled line. The dimension of the outer flap 72 from the fold curve 73 to the tip of the outer flap 72 is set to half the interval between the opposing side plates 24.

  In the packaging box 10 of the fifth embodiment, the same operation and effect as those of the second embodiment can be obtained. In addition, since the lid 50 is provided integrally, the sealing workability can be improved, and the convenience in handling the blank can be improved. In addition, in the packaging boxes 10 of the first embodiment and the third embodiment, the flaps constituting the lid 50 may be provided integrally.

(Sixth embodiment)
18 and 19 show a packaging box 10 according to a sixth embodiment. This packaging box 10 has the same basic structure as the packaging box 10 of the second embodiment. In the sixth embodiment, in order to stack two or more packaging boxes 10 in a stable state, a convex portion 75 is provided on the lid body 51 and a concave portion 78 is provided on the bottom plate 21. Different.

  As shown in FIGS. 20 and 22, the convex portion 75 is continuously provided at the upper end of the inner plate 36 attached to the inner surface of the side plate 24. The convex portion 75 is provided with a folding curve 76 composed of a plurality of cutting lines provided at intervals so as to form a perforation. The cover 50 is provided with a through hole 77 through which the convex portion 75 penetrates, at the ridge of the cover main body 51 and the second attaching plate 52B. By arranging the lid 50 with respect to the box main body 20 and bending the convex part 75 protruding through the through hole 77 along the folding curve 76 and attaching the convex part 75 to the upper surface of the lid main body 51, as shown in FIG. In addition, a thin plate-shaped projection 75 can be provided on the lid body 51.

  As shown in FIGS. 21 and 22, the concave portion 78 includes a through hole 79 provided in the bottom plate 21 and a closing plate 80 connected to the lower end of the inner plate 36. The through-hole 79 has a shape that allows the protrusion 75 located on the box body 20 to be fitted outside (see FIGS. 18 and 19). The closing plate 80 is connected to the lower end of the inner plate 36 via the folding curve 81, is bent so as to be located on the bottom plate 21, and is adhered to the bottom plate 21. The closing plate 80 has a shape capable of sufficiently covering the through hole 79 without interfering with the end plate 22 and the chamfering plate 42, and a part thereof is disposed below the reinforcing column 31.

  The fold of the closing plate 80 formed by the fold curve 81 is superimposed on the inside of the fold (fold curve 25) between the bottom plate 21 and the side plate 24. When the two bent portions overlap inside and outside, the bendability along the bent curve 81 located inside is poor. Therefore, the fold curve 81 is constituted by a pair of first fold curves 81a extending upward from both sides of the inner plate 36 and one second fold curve 81b extending upward from the intersection thereof.

  In the packaging box 10 of the sixth embodiment, the same operations and effects as those of the second embodiment can be obtained. In addition, since the packaging box 10 is provided with the convex portions 75 and the concave portions 78 for stacking, it is possible to improve convenience and stability when stacking. In addition, even if the convex part 75 and the concave part 78 of this 6th Embodiment are the packaging boxes 10 which have the basic structure which connects the reinforcement pillar 31 to the end plate 22 like 1st Embodiment and 3rd Embodiment, The same applies. Further, as in the fourth embodiment and the fifth embodiment, the packaging box 10 having the basic structure in which the reinforcing columns 31 are connected to the side plates 24 and having the upper side of the frame plate 26 shorter than the lower side is also the same. Applicable to

(Seventh embodiment)
FIGS. 23 and 24 show the packaging box 10 of the seventh embodiment. This packaging box 10 has the same basic structure as the packaging box 10 of the first embodiment. The seventh embodiment is significantly different from the first embodiment in that the reinforcing columns 31 are directly connected to the frame plate 26 without providing the folded plate 28 shown in FIGS. 1 and 2.

  As shown in FIG. 23, the packaging box 10 includes a box body 20 and a lid (not shown) that closes an opening of the box body 20. As in each embodiment, the lid is provided with a break portion for opening. The box main body 20 is also provided with a break portion (not shown).

  Referring also to FIG. 25, the box main body 20 includes a bottom plate 21, a pair of end plates 22, and a pair of side plates 24. The end plate (first side plate) 22 is erected on the first side (folded curve 23) of the bottom plate 21, and the side plate (second side plate) 24 is erected on the second side (folded curve 25) of the bottom plate 21. . A frame plate 26 is connected to the end plate 22 via a folding curve 27, and the frame plate 26 is adhered to the inner surface of the side plate 24. The frame plate 26 has a rectangular trapezoidal shape whose upper side is shorter than its lower side. The folding curve 27 is formed of a general ruled line, and extends in parallel along the step direction of the cardboard sheet 1.

(Overview of reinforcing columns)
As shown in FIGS. 23 and 24, reinforcing columns 31 are formed on the inner surfaces of both sides of the side plate 24 and extend from the vicinity of the lower end to the vicinity of the upper end of the end plate 22. The reinforcing column 31 is formed in a substantially rectangular cylindrical shape by the frame plate 26, the first reinforcing plate 32, the second reinforcing plate 34, and a part of the end plate 22, and the first reinforcing plate 32 is formed on the frame plate 26. It is installed continuously.

  Referring to FIG. 25, the first reinforcing plate 32, the second reinforcing plate 34, and the inner plate 36 are sequentially provided outward from the frame plate 26 in this order. The frame plate 26 is connected to the end plate 22 via a bending curve 27, and the bending curve 27 forms a first bent portion according to the second embodiment of the present invention. The first reinforcing plate 32 is connected to the frame plate 26 via a folding curve 29, and the folding curve 29 forms a second bent portion of the second embodiment of the present invention. The second reinforcing plate 34 is connected to the first reinforcing plate 32 via a bending curve 35, and the bending curve 35 forms a third bent portion according to the second embodiment of the present invention. The inner plate 36 is connected to the second reinforcing plate 34 via a fold curve 37, and the fold curve 37 forms a fourth bent portion according to the second embodiment of the present invention.

  As shown in FIG. 23 and FIG. 24, the first reinforcing plate 32 is continuously provided at the end of the frame plate 26 located at the center in the width direction of the side plate 24. The first reinforcing plate 32 is bent inward with respect to the frame plate 26 along a folding curve 29 formed of a general ruled line, and is inclined so as to approach the end plate 22 as the distance from the frame plate 26 increases. The fold curve (second fold) 29 extends along the fold curve (first fold) 27 and is inclined in a direction intersecting the corrugated direction of the cardboard sheet 1.

  Referring to FIG. 25, the first reinforcing plate 32 has a shape (similar shape) that is substantially line-symmetric with respect to the frame plate 26 about the folding curve 29, the upper side is shorter than the lower side, and the first reinforcing plate 32 is folded with the upper side. The angle formed by the curve 35 is a right angle, and the angle formed by the lower side and the bent curve 35 is also a right angle trapezoid. The maximum lateral width of the first reinforcing plate 32 is wider than the maximum lateral width of the frame plate 26, and the fold curve (third bent portion) 35 located at the distal end of the first reinforcing plate 32 is a fold curve at the base end of the frame plate 26. It is offset from the (first bent portion) 27 at a predetermined interval.

  As shown in FIG. 23 and FIG. 24, the second reinforcing plate 34 is provided continuously to the tip of the first reinforcing plate 32 located near the end plate 22. The second reinforcing plate 34 is bent along a folding curve 35 formed of a general ruled line so as to approach the side plate 24 as approaching the end plate 22. Referring to FIG. 25, the second reinforcing plate 34 has the same dimensions of the upper side and the lower side, the angles formed by the upper side and the lower side, and the bent curve 35 are right angles, and the angles formed by the upper side, the lower side, and the bent curve 37. Are also rectangular at right angles. The fold curve (third bent portion) 35 intersects (inclines) with the step direction of the corrugated cardboard sheet 1 and extends parallel to the fold curve (first bent portion) 27.

  The inner plate 36 is connected to the end of the second reinforcing plate 34 that contacts the end plate 22. The inner plate 36 is bent with respect to the second reinforcing plate 34 along a folding curve 37 formed by an inverted ruled line, and is attached to the inner surface of the end plate 22. The fold curve (fourth bent portion) 37 intersects (inclines) with the stepped direction of the corrugated cardboard sheet 1 and extends parallel to the fold curve (third bent portion) 35.

  Referring to FIG. 25, the upper side of the first reinforcing plate 32 is inclined with respect to the upper side of the frame plate 26, and the lower side of the first reinforcing plate 32 is inclined with respect to the lower side of the frame plate 26. The upper side of each of the second reinforcing plate 34 and the inner plate 36 is located on a straight line with respect to the upper side of the first reinforcing plate 32, and the second reinforcing plate 34 and the inner plate 36 are positioned with respect to the lower side of the first reinforcing plate 32. Each lower side is located on a straight line.

  The upper side of each of the first reinforcing plate 32, the second reinforcing plate 34, and the inner plate 36 is located below the upper side of the end plate 22, and is located on a plane parallel to the bottom plate 21. The lower side of each of the first reinforcing plate 32, the second reinforcing plate 34, and the inner plate 36 is located above the lower side of the end plate 22, and is located on a plane parallel to the bottom plate 21. As a result, the reinforcing column 31 extends from the lower end to the upper end of the end plate 22 in a substantially pyramidal cylindrical shape.

  When assembling the box body 20, the first reinforcing plate 32 is folded back along the fold curve 29 with respect to the frame plate 26, and the inner plate 36 is attached to the end plate 22 with an adhesive (first step). Subsequently, by folding the frame plate 26 along the folding curve 27 with respect to the end plate 22, the folding curves 29, 35, and 37 are folded in conjunction with each other, and the first reinforcing plate 32 and the second The reinforcing plate 34 is made to protrude inward (second step). Then, after bending the end plate 22 with respect to the bottom plate 21, the side plate 24 is bent with respect to the bottom plate 21, and the side plate 24 is stuck on the frame plate 26 (third step).

  When the first reinforcing plate 32 is folded back to the frame plate 26 (first step), since the folding curve 29 extends in a direction intersecting the step direction of the corrugated cardboard sheet 1, it is not affected by the step. The folding can be surely made along the folding curve 29. Therefore, since the inner plate 36 can be stuck to the end plate 22 at a predetermined position, the box-making accuracy can be improved.

  In a state before the frame plate 26 is bent with respect to the end plate 22, the first reinforcing plate 32, the second reinforcing plate 34, and the inner plate 36 are flatly overlapped with the end plate 22 and the frame plate 26. In this state, since the fold curve 35 is offset with respect to the fold curve 27, when the frame plate 26 is bent against the end plate 22 along the fold curve 27, the third bent portion by the fold curve 35 is set as the top. , The reinforcing plates 32, 34 can project inward. Therefore, the packaging box 10 of the seventh embodiment can obtain the same operation and effect as the first embodiment.

  The configuration in which the reinforcing pillars 31 are continuously provided on the frame plate 26 without providing the folded plate 28 as in the seventh embodiment is the packaging box 10 having the chamfered plate 42 as in the third embodiment. Is also applicable. Further, as in the second embodiment, the fourth embodiment, the fifth embodiment, and the sixth embodiment, the packaging box 10 having the basic structure in which the reinforcing columns 31 are connected to the side plates 24 can be similarly applied. . Of course, the same applies to the case where the lower side is shorter or longer than the upper side of the frame plate 26.

  The packaging box 10 of the present invention is not limited to the configuration of the above embodiment, and various modifications are possible.

  For example, a third reinforcing plate may be provided between the first reinforcing plate 32 and the second reinforcing plate 34, and the number of corners of the reinforcing column 31 can be changed as necessary. That is, the second reinforcing plate 34 may be continuous with the first reinforcing plate 32 via one or more reinforcing plates.

  Further, even in the configuration having the folded plate 28 as in the first embodiment to the sixth embodiment, the reinforcing column 31 may be formed in a pyramid cylindrical shape. When the reinforcing column 31 is in the shape of a pyramidal cylinder, the upper end may be smaller than the lower end, as in the seventh embodiment, or the inverted pyramid may be larger in upper end than the lower end.

  The upper side and / or the lower side of the first reinforcing plate 32 and the second reinforcing plate 34 constituting the reinforcing column 31 may be larger than the upper side and / or the lower side of the end plate 22 or the side plate 24. The upper side of each of the first reinforcing plate 32 and the second reinforcing plate 34 may be inclined with respect to the bottom plate 21. The second bent portion may be constituted by only a bent curve without providing a stepped portion.

  Packaging Box The material of the packaging box is not limited to a cardboard sheet made of paper, but may be a cardboard sheet made of resin.

DESCRIPTION OF SYMBOLS 1 ... Corrugated cardboard sheet 2 ... Front liner 3 ... Back liner 4 ... Middle shin 4a ... Recessed line 4b ... Convex line 6 ... Rule 7 ... Cork 10 ... Packaging box 20 ... Box body 21 ... Bottom plate 21a ... Chamfered edge 22 ... End plate 22a ... upper side 22b ... lower side 23 ... folding curve 24 ... side plate 24a ... separating part 25 ... folding curve 26 ... frame plate 26a ... upper side 26b ... lower side 27 ... folding curve (first bending part)
28: folded plate 28a: upper side 28b: lower side 29: folding curve (second bent portion)
Reference numeral 30: stepped portion 31: reinforcing column 32: first reinforcing plate 32a: upper side 32b: lower side 33: bending curve (third bending portion)
34 ... second reinforcing plate 34a ... upper side 34b ... lower side 35 ... bending curve (fourth bending part)
36 ... inner plate 36a ... upper side 36b ... lower side 37 ... bending curve (fifth bending part)
39 ... flap 40 ... folding curve 40a ... cut 42 ... chamfering plate 42a ... protruding part 43 ... folding curve 50 ... lid body 51 ... lid body 51a ... chamfered side 52, 52A, 52B ... sticking plate 53 ... folding curve 55 ... Folded curve 60 ... Operating part 60a ... Folded curve 60b ... First breaking line 60c ... Second breaking line 60d ... Cutting line 61 ... First breaking part 61a ... First cutting line 61b ... Second cutting line 62 ... Second Breaking part 63 ... Third breaking part 63a ... First cutting line 63b ... Second cutting line 64 ... Breaking part 64a ... Cutting line 64b ... Non-cutting part 65 ... Notch part 66 ... Notch part 67 ... Auxiliary folding curve 68 ... Breaking part 70 ... inner flap 71 ... folding curve 72 ... outer flap 73 ... folding curve 75 ... convex part 76 ... folding curve 77 ... through hole 78 ... concave part 79 ... through hole 80 ... closing plate 81 ... folding curve 81a ... first folding curve 81b … The second folding curve

Claims (10)

A front liner, a back liner positioned at an interval from the front liner, and a packing box made of a corrugated cardboard sheet, which is disposed therebetween, and has a middle lining in which a plurality of concave and convex ridges are continuous in a wavy manner. ,
A bottom plate having a first side and a second side extending in a direction intersecting the first side;
A first side plate erected on the first side,
A second side plate erected on the second side,
A frame plate that is bent along a first bent portion that is continuous with the first side plate and extends in a direction intersecting with the first side and fixed to an inner surface of the second side plate;
A folded plate that is connected to the frame plate via a second bent portion extending along the first bent portion, is bent along the second bent portion, and is fixed to an inner surface of the frame plate. When,
A third bent portion extending along the second bent portion is connected to the folded plate, is bent along the third bent portion, and is spaced apart inward of the first side plate. A first reinforcing plate located;
A second reinforcing plate continuous with the first reinforcing plate and bent toward the first side plate along a fourth bent portion extending along the third bent portion;
The fifth reinforcing member is connected to the second reinforcing plate via a fifth bending portion extending along the fourth bending portion, is bent along the fifth bending portion, and is fixed to an inner surface of the first side plate. With an inner plate and
The step direction of the corrugated cardboard sheet, which is the direction in which the concave streaks and the convex streaks of the middle shin extend, extends vertically along the frame plate,
The first bent portion extends parallel to the step direction,
The packaging box, wherein the second bent portion extends in a direction crossing the step direction.   The packaging box according to claim 1, wherein the third bent portion intersects with the step direction and extends parallel to the first bent portion.   The packaging box according to claim 1, wherein the third bent portion, the fourth bent portion, and the fifth bent portion extend in parallel with each other. An angle between the third bent portion and an upper side of the first reinforcing plate is a right angle,
4. The packaging box according to claim 3, wherein an angle between the fourth bent portion and an upper side of the second reinforcing plate is a right angle. 5.   The packaging box according to claim 3, wherein an upper side of the first reinforcing plate and an upper side of the second reinforcing plate are located on a plane parallel to the bottom plate. The frame plate and the folded plate are each formed with a stepped portion extending in a band shape adjacent to the second bent portion,
The pair of squashed portions are depressed so as to become gradually narrower from one of the front liner and the back liner toward the other when viewed from the direction in which the squashed portions extend. A packaging box according to any one of the preceding claims. The upper side of the frame plate is shorter than the lower side of the frame plate,
The packaging box according to claim 1, wherein the folded plate has a similar shape smaller than the frame plate. The upper side of the frame plate is longer than the lower side of the frame plate,
The packaging box according to claim 1, wherein the folded plate has a similar shape smaller than the frame plate.   9. The frame according to claim 1, wherein the frame plate is continuous with the first side plate via a chamfer plate extending in a direction intersecting the first side plate and the frame plate. 10. Packaging box. A front liner, a back liner positioned at an interval from the front liner, and a packing box made of a corrugated cardboard sheet having a middle lining arranged between these and having a plurality of ridges and ridges wavyly continuous, ,
A bottom plate having a first side and a second side extending in a direction intersecting the first side;
A first side plate erected on the first side,
A second side plate erected on the second side,
A frame plate that is continuous with the first side plate and is bent along a first bent portion extending in a direction intersecting with the first side, and fixed to an inner surface of the second side plate;
The frame is connected to the frame plate via a second bent portion extending along the first bent portion, is bent along the second bent portion, and approaches the first side plate as the distance from the frame plate increases. A first reinforcing plate inclined as follows,
A second reinforcing plate continuous with the first reinforcing plate and bent toward the first side plate along a third bent portion extending along the second bent portion;
The second reinforcing plate is connected to the second reinforcing plate via a fourth bent portion extending along the third bent portion, is bent along the fourth bent portion, and is fixed to an inner surface of the first side plate. With an inner plate and
The step direction of the corrugated cardboard sheet, which is the direction in which the concave streak and the convex streak of the middle shin extend, extends vertically along the frame plate,
The first bent portion extends parallel to the step direction,
The packaging box, wherein the second bent portion extends in a direction crossing the step direction.

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