Packaging box

Abstract

To provide a packaging box whose decagonal opening part can be easily closed.SOLUTION: A packaging box 1 has a bottom lid part 3 that closes the decagonal opening part of a cylindrical body 2, the cylindrical body 2 is formed of two sets of first to fifth side walls, the bottom lid part 3 has a pair of lid body pieces 22 and a pair of lid locking pieces 24, a pair of interlocking recess parts provided in recessed form at the tip sides of the pair of lid body pieces 22 and a pair of wide protrusions and a pair of narrow protrusions protruding relatively therefrom, and a pair of insertion protrusions 33 protrude in opposite directions at the tip sides of the pair of lid locking pieces 24. When the bottom lid part 3 is formed, while the pair of lid body pieces 22 engage with interlocking recesses of each other, the narrow protrusion of one (the other) overlaps on the other (one) lid body piece 22, a pair of insertion grooves 36 open in opposite directions within the range of interlocking recesses of each other, one (the other) lid locking piece 24 presses the other (one) narrow protrusion, and one (the other) insertion protrusion 33 is inserted into the insertion groove 36 open on the side of one (the other) lid body pieces 22.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present invention relates to a packaging box. [Background technology]

[0002] A packaging container including an octagonal prism-shaped cylinder is known (Patent Document 1). In this packaging container, a single lid that closes the octagonal opening of the cylinder is formed in an octagonal shape of the same size as the opening. Another known paper container includes a roughly hexagonal prism-shaped cylinder (Patent Document 2). In this paper container, the bottom that closes the hexagonal opening of the cylinder is a so-called "bottom." This bottom is constructed based on the same technical concept as the "bottom" that is widely used in general rectangular paper boxes. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility Model Registration No. 3225031 [Patent Document 2] Japanese Patent Publication No. 2020-66464 Summary of the Invention [Problem to be solved by the invention]

[0004] A decagonal prism-shaped box, which is closer to a cylinder than a hexagonal or octagonal prism, is sometimes required. In this case, it may be impractical to form a lid that closes the decagonal opening from a single plate or to imitate the well-known floor of hell. For example, because the sides of a decagon are shorter than the sides of a hexagon or octagon, a lid attached to one side of the decagon is prone to tearing from the cylinder. Furthermore, with a hexagonal cylinder, fixing a pair of opposing faces (edges) across the axis determines the positions of the other four faces (edges). Therefore, even if a structure imitating the well-known floor of hell is used, it is easy to close the opening in a manner similar to that of the well-known floor of hell. However, with a decagonal cylinder, fixing a pair of opposing faces (edges) across the axis does not determine the positions of the other eight faces (edges). Therefore, it may be difficult to close the opening in a manner similar to that of the well-known floor of hell.

[0005] In consideration of the above circumstances, the present invention provides a packaging box that can easily close a decagonal opening. [Means for solving the problem]

[0006] The present invention provides a packaging box including a cylindrical body having a decagonal opening at one end in an axial direction, and a decagonal lid portion that closes the opening, wherein the cylindrical body is formed by connecting a pair of first side walls, a pair of second side walls, a pair of third side walls, a pair of fourth side walls, and a pair of fifth side walls in a circumferential direction around the axial center while facing each other across the axial center of the cylindrical body, and the lid portion is connected to one end of the pair of second side walls in the axial direction and has a shape that is point-symmetrical about the axial center, and the pair of lids interlock with each other at their tip ends to completely close the opening. a main body piece; and a pair of lid locking pieces connected to one end of the pair of fourth side walls in the axial direction, shaped to be point-symmetrical about the axis, and arranged on the surface of the lid main body piece without overlapping each other at their tip ends, wherein, in a state in which the lid portion is formed, a pair of interlocking recesses are recessed into the tip sides of the pair of lid main body pieces from positions spaced apart from the axis, and a pair of wide protrusions adjacent to the interlocking recesses on the axis side and a pair of narrow protrusions adjacent to the interlocking recesses at positions spaced apart from the axis are relatively protruded, and the tips of the pair of lid locking pieces On the side of the first side wall, a pair of insertion protrusions are provided in opposite directions so as to extend parallel to the second side wall and beyond a center line passing through the axis when the lid portion is formed, and when the pair of lid body pieces are bent inward to engage each other's mating recesses near the axis when the lid portion is formed, the narrow protrusion on one side overlaps the surface of the other lid body piece, and the narrow protrusion on the other side overlaps the surface of one lid body piece, and in this state, within the range of each mating recess, a portion of one lid body piece excluding the tip side is spaced apart from the surface of the wide protrusion on the other side. An insertion groove is formed on the other side of the lid body, and a portion of the other lid body piece excluding the tip side forms an insertion groove on one of the lid body pieces between the surface of one of the wide convex portions, one of the lid locking pieces is bent inward so as to press against the other narrow convex portion, one of the insertion convex portions is inserted into the insertion groove opening on one of the lid body pieces, and the other lid locking piece is bent inward so as to press against one of the narrow convex portions, and the other insertion convex portion is inserted into the insertion groove opening on the other of the lid body pieces.

[0007] In this case, the amount of protrusion of the narrow convex portion is preferably smaller than the amount of protrusion of the wide convex portion.

[0008] In this case, the lid portion is connected to one end of the pair of fifth side walls in the axial direction, has a shape that is point-symmetrical about the axis, and further includes a pair of lid clamping pieces that are superimposed on the surfaces of the pair of interlocked lid main body pieces, and guide protrusions are protruded from the tip ends of the lid clamping pieces in a direction approaching the axis when the lid portion is formed, and when the lid portion is formed, after bending the pair of lid main body pieces, one of the lid clamping pieces is bent inward to overlap the narrow protrusion of the other, and the one guide protrusion is bent inward to overlap the narrow protrusion of the other. One of the lid locking pieces protrudes toward the axis from the convex portion and is overlapped on the surface of one of the lid main body pieces so as to fit along the opening of the insertion groove, the other lid clamping piece is bent inward so as to overlap one of the narrow convex portions, the other guiding convex portion protrudes toward the axis from one of the narrow convex portions and is overlapped on the surface of the other lid main body piece so as to fit along the opening of the insertion groove, one of the lid locking pieces clamps one of the lid clamping pieces to hold down the other narrow convex portion, and the other lid locking piece clamps down on the other narrow convex portion.

[0009] In this case, the lid portion further has a pair of first inner pieces connected to one end of the axial direction of the pair of first side walls and having a shape that is point-symmetrical about the axis center, and a pair of second inner pieces connected to one end of the axial direction of the pair of third side walls and having a shape that is point-symmetrical about the axis center, and when forming the lid portion, the pair of first inner pieces and the pair of second inner pieces may each be folded inward prior to folding the pair of lid main body pieces.

[0010] In this case, the cylindrical body is folded along a boundary line formed parallel to the axial direction at a position corresponding to the adjacent second inner piece and the lid locking piece, and the adjacent second inner piece and the lid locking piece are formed so as not to straddle an imaginary line extending the boundary line in the axial direction.

[0011] In this case, the device further includes a top lid portion that closes a star-shaped top opening that opens at the upper end of the cylindrical body, which is the other end in the axial direction, and the two sets of the first to fifth side walls are connected in the circumferential direction via ten fold lines, and the ten fold lines are composed of five vertical fold lines that extend parallel to the axial direction of the cylindrical body and five inclined fold lines that extend downward from the upper ends of the vertical fold lines while inclining in one direction in the circumferential direction, and the five vertical fold lines and the five inclined fold lines are arranged alternately in the circumferential direction, and the one first side wall, the one third side wall, the one fifth side wall, the other second side wall, and the other fourth side wall each form a convex wall that is formed in a right-angled triangle shape with the vertical fold lines and their lower edges at right angles, and with the inclined fold lines as their hypotenuses. The second side wall on one side, the fourth side wall on one side, the first side wall on the other side, the third side wall on the other side, and the fifth side wall on the other side each have a pair of top fold lines that extend diagonally upward from the upper ends of adjacent pairs of vertical fold lines so as to approach each other. Constitutes a concave wall formed in a pentagonal shape by the vertical fold lines, the inclined fold lines, and its own lower edge, and the concave wall has an auxiliary fold line that inclines in the same direction as the inclined fold line between the lower end of the vertical fold line and the intersection of the pair of top fold lines, and the five convex walls and the five concave walls are folded forward along the vertical fold lines and the inclined fold lines, respectively, and the five concave walls are folded backward along the auxiliary fold lines, respectively, to form the top opening. [Effects of the Invention]

[0012] According to the present invention, the decagonal opening of the packaging box (cylindrical body) can be easily closed. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a perspective view showing a packaging box according to an embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view showing the bottom surface of a packaging box according to an embodiment of the present invention. [Figure 3] 1 is a plan view showing a blank for a packaging box according to an embodiment of the present invention. FIG. [Figure 4] 1 is a plan view of a packaging box blank according to an embodiment of the present invention, emphasizing the convex or concave wall. FIG. [Figure 5] 1 is a bottom view showing a state in which the first inner piece and the second inner piece of the packaging box according to one embodiment of the present invention are folded inward. FIG. [Figure 6] 1 is a bottom view showing a state in which a pair of lid body pieces of a packaging box according to one embodiment of the present invention are interlocked together. FIG. [Figure 7] 1 is a perspective view showing a state in which a pair of lid body pieces of a packaging box according to one embodiment of the present invention are interlocked together. FIG. [Figure 8] 1 is a bottom view showing a state in which the lid clamping pieces of the packaging box according to one embodiment of the present invention are folded inward. FIG. [Figure 9] 10 is a perspective view showing a process of inserting a lid locking piece of a packaging box into an insertion groove according to one embodiment of the present invention. FIG. [Figure 10] FIG. 2 is a bottom view showing the bottom lid portion of the packaging box according to one embodiment of the present invention. [Figure 11] 1 is a perspective view showing a state in which a first top panel and a second top panel of a packaging box according to one embodiment of the present invention are folded inward. [Figure 12] 10A to 10C are perspective views showing a process of forming a top lid portion of a packaging box according to an embodiment of the present invention. [Figure 13] FIG. 10 is a plan view showing a blank for a packaging box according to a first modified example of one embodiment of the present invention. [Figure 14] FIG. 10 is a plan view showing a blank for a packaging box according to a second modified example of one embodiment of the present invention. [Figure 15] FIG. 10 is a plan view showing a blank for a packaging box according to a third modified example of one embodiment of the present invention. [Figure 16] FIG. 10 is a plan view showing a blank for a packaging box according to a fourth modified example of one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. Note that U and D in the drawings indicate up and down, and the "axial direction" referred to in the claims refers to the up-down direction. Terms indicating directions and positions are used in this specification, but these terms are used for convenience of explanation and do not limit the technical scope of the present invention. Furthermore, terms indicating directions and positions are based on the directions and positions when the packaging box is in use.

[0015] [Packaging box] A packaging box 1 according to an embodiment will be described with reference to Figures 1 to 4. Figure 1 is a perspective view showing the packaging box 1. Figure 2 is a perspective view showing the bottom surface of the packaging box 1. Figure 3 is a plan view showing a blank 1A of the packaging box 1. Figure 4 is a plan view emphasizing the convex wall 17 (upper section) or the concave wall 18 (lower section).

[0016] As shown in Figures 1 and 2, packaging box 1 is formed in the shape of an irregular prism having a decagonal bottom and a star-shaped top. Packaging box 1 includes a cylindrical body 2, a bottom lid 3 (lid) that closes the lower end of cylindrical body 2, and a top lid 4 that closes the upper end of cylindrical body 2. As will be described in detail later, cylindrical body 2 has a decagonal bottom opening 2D at its lower end (one end in the axial direction) and a star-shaped top opening 2U at its upper end (the other end in the axial direction). Bottom lid 3 closes bottom opening 2D and forms the bottom of cylindrical body 2. Top lid 4 closes top opening 2U and forms the top of cylindrical body 2. In this specification, the term "decagon" refers to a decagon with ten sides and ten interior angles of approximately equal size, and the term "star shape" refers to a shape in which five protrusions and five recesses are alternately arranged in a circumferential direction around the axis A1 of the cylindrical body 2. The axis A1 of the cylindrical body 2 refers to approximately the center (centroid) of the decagon when viewing the cylindrical body 2 from the top or bottom. In this specification, the terms "line symmetry" and "point symmetry" do not require strict "line symmetry" or strict "point symmetry," but rather allow for slight errors.

[0017] [blank] The packaging box 1 is assembled from a blank 1A shown in Figure 3. The blank 1A is formed by punching out a sheet of paperboard using a cutting die or the like. The paperboard is, for example, a multi-layered thick cardboard with a surface coating. Note that Figures 3 and 4 show the front (outer) side of the packaging box 1, and although not shown, a pattern or the like is printed on the surface of the packaging box 1. In this specification, the direction parallel to the grain is referred to as the "grain direction," and the direction perpendicular to the grain direction is referred to as the "orthogonal direction." In the drawings, "X" indicates the "grain direction," and "Y" indicates the "orthogonal direction."

[0018] 3, the blank 1A includes two sets of first to fifth side walls 11 to 15, a pair of first inner pieces 21, a pair of lid main body pieces 22, a pair of second inner pieces 23, a pair of lid locking pieces 24, a pair of lid clamping pieces 25, a first top surface piece 41, a second top surface piece 42, a pair of third top surface pieces 43, and a fourth top surface piece 44. As will be described in detail later, the two sets of first to fifth side walls 11 to 15 form the cylindrical body 2, the two sets of lower pieces 21 to 25 form the bottom surface lid portion 3, and the upper pieces 41 to 44 form the top surface lid portion 4.

[0019] <1st to 5th side walls> The two sets of first to fifth side walls 11-15 are arranged in a row in the orthogonal direction (circumferential direction) via ten boundary lines. The ten boundary lines are composed of five vertical fold lines L1 and five inclined fold lines L2. The vertical fold lines L1 extend parallel to the grain direction (axial direction of the cylindrical body 2). The inclined fold lines L2 extend downward from the upper end of the vertical fold line L1 while inclining in one direction (rightward in FIG. 3) in the orthogonal direction (circumferential direction). The vertical fold lines L1 and the inclined fold lines L2 are, for example, general-purpose creases formed by recessing the surface of the cardboard and are formed in a straight line. The five vertical fold lines L1 and the five inclined fold lines L2 are arranged alternately in the orthogonal direction (circumferential direction) to divide the two sets of first to fifth side walls 11-15. In this specification, for the sake of convenience, when the two sets of first to fifth side walls 11 to 15 are described without distinction, only Arabic numerals are added to the reference numerals, and when the two sets of first to fifth side walls 11 to 15 are described while distinguishing one from the other, "A" is added to the reference numeral of one of the first to fifth side walls 11 to 15, and "B" is added to the reference numeral of the other of the first to fifth side walls 11 to 15. Furthermore, in the drawings, "A" and "B" are added.

[0020] As shown in the upper parts of Figures 3 and 4, the first side wall 11A, the third side wall 13A, the fifth side wall 15A, the second side wall 12B, and the fourth side wall 14B are each formed into a right-angled triangle with a right angle between the vertical fold line L1 and its lower edge and an inclined fold line L2 as its hypotenuse. For ease of explanation, the first side wall 11A, the third side wall 13A, the fifth side wall 15A, the second side wall 12B, and the fourth side wall 14B are collectively referred to as the "convex wall 17." In the blank 1A shown in the upper part of Figure 4, the convex wall 17 is highlighted with a thick solid line. The "right angle" between the vertical fold line L1 and the lower edge of the convex wall 17 does not mean that it is strictly a right angle, but rather that a slight error is allowed.

[0021] As shown in the lower part of Figures 3 and 4, the second side wall 12A, the fourth side wall 14A, the first side wall 11B, the third side wall 13B, and the fifth side wall 15B each have a pair of top fold lines L5 extending diagonally upward from the upper ends of a pair of adjacent vertical fold lines L1 to approach each other, as a boundary with the top cover portion 4, the vertical fold line L1, the inclined fold line L2, and their own lower edges, forming a pentagonal shape. The fifth side wall 15B is divided into two parts and arranged separately at both ends of the blank 1A in the orthogonal direction. A tube joint piece 16 is connected to a portion of the fifth side wall 15B connected to the first side wall 11A via the inclined fold line L2 in one of the orthogonal directions (the right side in Figure 3) via an auxiliary vertical line L11 (e.g., a general-purpose crease). The separated fifth side walls 15B are connected by joining the cylindrical joint piece 16 to the rear surface (inner surface) of a portion of the fifth side wall 15B located on the other side of the orthogonal direction (left side in FIG. 3). For ease of explanation, the second side wall 12A, the fourth side wall 14A, the first side wall 11B, the third side wall 13B, and the fifth side wall 15B are collectively referred to as the "concave wall 18." In the blank 1A shown in the lower part of FIG. 4, the concave wall 18 is highlighted with a thick solid line.

[0022] The concave wall 18 is formed in a pentagonal shape that gradually widens in the perpendicular direction from the bottom end toward the top. An auxiliary fold line L3 is formed on the concave wall 18 between the bottom of the vertical fold line L1 and the intersection of a pair of top fold lines L5, sloping in the same direction as the inclined fold line L2. The auxiliary fold line L3 is, for example, a lead crease formed by perforating a general-purpose crease, and is formed as a straight line generally parallel to the inclined fold line L2. The top end of the auxiliary fold line L3 (the intersection of the pair of top fold lines L5) and the bottom end of the inclined fold line L2 are positioned generally at the same position in the perpendicular direction. The auxiliary fold line L3 divides the concave wall 18 into a generally parallelogram-shaped portion between the inclined fold line L2 and the auxiliary fold line L3, and a generally triangular portion between the auxiliary fold line L3 and the vertical fold line L1. The third side wall 13B has a fold line L6 extending parallel to the vertical fold line L1 between the lower end of the inclined fold line L2, which is the boundary with the fourth side wall 14B, and the intersection of the pair of top fold lines L5. The tube joint piece 16 also has an auxiliary inclined line L13 (e.g., a lead crease) formed in such a way that it coincides with the auxiliary fold line L3 formed in a part of the other fifth side wall 15B in the orthogonal direction when the tube body 2 is configured.

[0023] As shown in Figure 3, in the blank 1A state, the lower edges of the five convex walls 17 and the five concave walls 18 are bottom fold lines L4 (e.g., general-purpose creases) that serve as boundaries with the bottom cover portion 3 and extend in a straight line along the orthogonal direction. On the other hand, in the blank 1A state, the upper edges of the five concave walls 18 are multiple top fold lines L5 (e.g., general-purpose creases) that are bent in a zigzag pattern. Adjacent pairs of top fold lines L5 are formed symmetrically about the vertical fold line L1 or a vertical line (not shown) that passes through their intersection.

[0024] <Various pieces that make up the bottom lid> As shown in FIG. 3, the pair of first inner pieces 21 are connected to the lower edges (one axial end) of the pair of first side walls 11 via a bottom fold line L4. The pair of lid main body pieces 22 are connected to the lower edges (one axial end) of the pair of second side walls 12 via a bottom fold line L4. The pair of second inner pieces 23 are connected to the lower edges (one axial end) of the pair of third side walls 13 via a bottom fold line L4. The pair of lid locking pieces 24 are connected to the lower edges (one axial end) of the pair of fourth side walls 14 via a bottom fold line L4. The pair of lid clamping pieces 25 are connected to the lower edges (one axial end) of the pair of fifth side walls 15 via a bottom fold line L4.

[0025] As with the two sets of first to fifth side walls 11-15 described above, when describing the pair of lid main body pieces 22, the pair of lid locking pieces 24, and the pair of lid clamping pieces 25 without distinction, only Arabic numerals are used for the reference numerals, and when describing the pair of lid main body pieces 22, the pair of lid locking pieces 24, and the pair of lid clamping pieces 25 with distinction, "A" or "B" is added to the reference numerals. Furthermore, the reference numerals used for the components included in the three pieces 22, 24, and 25 are the same as those described above. Furthermore, since the two sets of first to fifth side walls 11-15 have substantially the same shape in the blank 1A state, the following description will focus on one set of first to fifth side walls 11-15. Furthermore, in the drawings, "A" and "B" are added.

[0026] <First inner piece, second inner piece> The first inner piece 21 and the second inner piece 23 are each formed into a substantially right-angled triangle with the bottom fold line L4 as the base and the boundary line with the lid main body piece 22 (described later) as the hypotenuse. The first inner piece 21 and the second inner piece 23 are formed into a substantially right-angled triangle that is line-symmetrical to each other with the lid main body piece 22 at the center.

[0027] <Lid body piece> The lid main body piece 22 is formed in a generally hexagonal shape that becomes wider as it moves away from the bottom fold line L4 (the lower edge of the second side wall 12) in one direction in the grain direction. The lid main body piece 22 abuts against the oblique sides of the first inner piece 21 and the second inner piece 23 at its base end in the grain direction. The maximum dimension (maximum width dimension) of the lid main body piece 22 in the orthogonal direction is generally equal to the combined dimension (width dimension) of the first to third side walls 11 to 13 in the orthogonal direction. The dimension (extension dimension) of the lid main body piece 22 in the grain direction is sufficiently longer (for example, approximately three times longer) than the dimension (extension dimension) of the first inner piece 21, etc. in the grain direction. As will be described in detail later, the lid main body piece 22 is formed slightly larger than the size of the bottom opening 2D of the cylindrical body 2 divided into two equal parts, and the pair of lid main body pieces 22 are formed so that the tip ends of the pair of lid main body pieces 22 can be interlocked with each other to completely close the bottom opening 2D.

[0028] An interlocking recess 30 is recessed at the leading end of the lid body piece 22 in the grain direction, from approximately the center in the orthogonal direction to a position shifted to one side. Also, at the leading end of the lid body piece 22 in the grain direction, a wide protrusion 31 adjacent to the interlocking recess 30 at the center in the orthogonal direction, and a narrow protrusion 32 adjacent to the interlocking recess 30 at a position away from the center in the orthogonal direction, are relatively protrudingly provided. The protrusion amount P2 of the narrow protrusion 32 in the grain direction is smaller than the protrusion amount P1 of the wide protrusion 31 (for example, about half).

[0029] <Lid locking piece> The lid locking piece 24 is formed in a generally trapezoidal shape that narrows as it moves away from the bottom fold line L4 (the lower edge of the fourth side wall 14) in one direction in the grain direction. The dimension (extension dimension) of the lid locking piece 24 in the grain direction is longer than the extension dimensions of the first inner piece 21, etc., and shorter than the extension direction of the lid main body piece 22. One orthogonal side S1 of the lid locking piece 24 adjacent to the second inner piece 23 (lid main body piece 22) with a gap between them is inclined to be nearly parallel to the vertical fold line L1 and is slightly inclined away from the second inner piece 23, etc. On the other hand, the other orthogonal side S2 of the lid locking piece 24 that abuts against the lid clamping piece 25 is inclined to be approximately parallel to the inclined fold line L2, etc.

[0030] As will be described in detail later, the cylindrical body 2 is foldable along a boundary line formed parallel to the grain direction (axial direction of the cylindrical body 2) at a position corresponding to the position between adjacent second inner pieces 23 and lid locking pieces 24. Specifically, the cylindrical body 2 is folded back approximately 180 degrees along a vertical fold line L1 between the third side wall 13A and the fourth side wall 14A and a fold line L6 formed on the third side wall 13B to assume a folded form. The adjacent second inner pieces 23 and lid locking pieces 24 are formed so as not to straddle an imaginary line V extending downward (axially) from the above-mentioned boundary line (vertical fold line L1, fold line L6) so as not to hinder the folding of the cylindrical body 2.

[0031] An insertion protrusion 33 protrudes from the tip end of the other side S2 of the lid locking piece 24 in the grain direction. The insertion protrusion 33 is formed in a generally fan shape with the tip edge curved in a generally arc shape. A generally V-shaped notch is formed on the tip end of the insertion protrusion 33 in the grain direction. As will be described in detail below, the other side S2 of the lid clamping piece 25 is formed so as to be parallel to the second side wall 12 and generally coincide with the center line A2 passing through the axis A1 when the bottom lid portion 3 is formed. Furthermore, the pair of insertion protrusions 33 protrude in opposite directions from the tip end sides of the pair of lid locking pieces 24 so as to exceed the center line A2 when the bottom lid portion 3 is formed.

[0032] <Lid holding piece> The lid clamping piece 25 is formed in a generally trapezoidal shape extending diagonally along the other side S2 of the lid locking piece 24. The lid clamping piece 25 abuts against the other side S2, closer to the base end in the grain direction than the insertion protrusion 33 of the lid locking piece 24. The dimension (extension) of the lid clamping piece 25 in the grain direction is longer than the extension dimensions of the first inner piece 21, etc., and shorter than the extension direction of the lid locking piece 24. As will be described in detail later, the lid clamping piece 25 has an extension dimension that exceeds the center line A2 from one side to the other when the bottom lid portion 3 is formed. In addition, a guide protrusion 34 is protruded from the tip end of the lid clamping piece 25 in the grain direction, oriented in the same direction as the insertion protrusion 33 of the lid locking piece 24. The guide projection 34 is formed in a protrusion shape with a rounded tip, and when the bottom cover portion 3 is formed, it projects from the tip side of the cover clamping piece 25A in a direction approaching the axis A1.

[0033] <Various pieces that make up the top cover> As shown in FIG. 3, the first to fourth top surface pieces 41 to 44 are connected to the upper edge (the other axial end) of the concave wall 18 via a top surface fold line L5. The first top surface piece 41 is divided into two pieces, disposed separately at both ends of the blank 1A in the orthogonal direction, and connected to the upper edge of the fifth side wall 15B, which is also divided into two pieces. The second top surface piece 42 is connected to the upper edge of the second side wall 12A. A pair of third top surface pieces 43 are connected to the upper edges of the fourth side wall 14A and the third side wall 13B. The fourth top surface piece 44 is connected to the upper edge of the first side wall 11B.

[0034] <First top piece> A top joint piece 45 is connected to a portion of the first top surface piece 41 on one side in the orthogonal direction via an auxiliary vertical line L11. The top joint piece 45 is connected to the upper end of the tube joint piece 16 via an auxiliary top surface line L51 (e.g., a general-purpose crease). The auxiliary top surface line L51 is formed to coincide with the top surface fold line L5 on the other side in the orthogonal direction when the cylindrical body 2 is constructed. The top joint piece 45 is joined to the back surface (inner surface) of a portion of the first top surface piece 41 located on the other side in the orthogonal direction, thereby connecting the separated first top surface pieces 41. The connected first top surface piece 41 is formed in a polygonal shape with two star-shaped protrusions and one recess, approximately 1 / 5 the size of the top surface opening 2U of the cylindrical body 2. The leading edge of the first top surface piece 41 in the grain direction protrudes toward the second top surface piece 42 and is recessed at a position away from the second top surface piece 42, forming a roughly crank-shaped bend.

[0035] <Second top piece> The second top panel piece 42 is approximately 2 / 5 the size of the top panel opening 2U and is formed in a polygonal shape consisting of two star-shaped protrusions and one recess. The leading edge of the second top panel piece 42 in the grain direction is formed in a folded line that extends diagonally upward to the right and is slightly recessed in Figure 3. A roughly rectangular top insertion recess 46 is recessed in the approximate center of the leading edge of the second top panel piece 42. The section of the leading edge of the second top panel piece 42 from the top insertion recess 46 to the diagonally upward to the right roughly coincides with the crank-shaped leading edge of the first top panel piece 41 when the top cover portion 4 is formed.

[0036] <Third top piece> Each third top panel piece 43 is approximately 1 / 5 the size of the top opening 2U and is formed in a polygonal shape consisting of two star-shaped protrusions and one recess. The pair of third top panel pieces 43 are shaped to be line-symmetrical with respect to the fourth top panel piece 44. A generally trapezoidal top regulation protrusion 47 protrudes from approximately the center of the leading edge of each third top panel piece 43 in the grain direction. When the top cover portion 4 is formed, the pair of top regulation protrusions 47 cover parts of both sides of the top insertion recess 46 of the second top panel piece 42, narrowing the width of the top insertion recess 46. Note that the fold line L6 formed on the third side wall 13B is extended in the other direction in the grain direction and is also formed on the third top panel piece 43 connected to the third side wall 13B.

[0037] <Fourth top piece> The fourth top panel piece 44 is slightly larger than 1 / 5 of the top panel opening 2U and has a polygonal shape with two star-shaped protrusions and one recess. The leading edge of the fourth top panel piece 44 in the grain direction is gradually tapered. A top insertion piece 50 is connected to the approximate center of the leading edge of the fourth top panel piece 44. The top insertion piece 50 has an insertion body piece 51 connected to the fourth top panel piece 44 via an insertion fold line L7 (e.g., a general-purpose crease) and a pair of insertion locking pieces 52 connected to both ends of the insertion body piece 51 in the perpendicular direction via locking fold lines L8 (e.g., a general-purpose crease). The insertion body piece 51 is formed in a generally trapezoidal shape slightly smaller than the top insertion recess 46. The top insertion piece 50 is inserted into the top insertion recess 46 of the second top panel piece 42 when the top cover portion 4 is formed.

[0038] Although the various fold lines, such as the vertical fold line L1, the inclined fold line L2, and the auxiliary fold line L3, are configured as general-purpose creases or lead creases, they are not limited to these and may be any lines, such as perforations, that can be used to fold the paperboard in the desired direction.

[0039] [Assembling packaging boxes] Next, an example of the procedure for assembling the packaging box 1 will be described with reference to Figures 1, 2, and 5 to 12. Figure 5 is a bottom view showing the first inner piece 21 and the second inner piece 23 folded inward. Figure 6 is a bottom view showing the pair of lid body pieces 22 interlocked together. Figure 7 is a perspective view showing the pair of lid body pieces 22 interlocked together. Figure 8 is a bottom view showing the lid clamping piece 25 folded inward. Figure 9 is a perspective view showing the process of inserting the lid locking piece 24 into the insertion groove 36. Figure 10 is a bottom view showing the bottom lid portion 3 of the packaging box 1. Figure 11 is a perspective view showing the first top piece 41 and the second top piece 42 folded inward. Figure 12 is a perspective view showing the process of forming the top lid portion 4 of the packaging box 1. In this specification, folding a paperboard so that the back surface faces inward is referred to as a "normal fold," and folding a paperboard so that the front surface faces inward is referred to as a "reverse fold."

[0040] The blank 1A is folded and glued at appropriate locations by a processing device, for example, to form the folded packaging box 1 (cylindrical body 2) (not shown). Specifically, the third side wall 13B is folded approximately 180 degrees along the fold line L6, and the third side wall 13A is folded approximately 180 degrees along the vertical fold line L1 between the third side wall 13B and the fourth side wall 14A. The tube joint piece 16 is adhered to the backside of a portion of the fifth side wall 15B located on the other side of the orthogonal direction, and the top joint piece 45 is adhered to the backside of a portion of the first top piece 41 located on the other side of the orthogonal direction. This unites the divided fifth side wall 15B and the first top piece 41, respectively, to form the folded packaging box 1 (cylindrical body 2). Note that hot melt adhesives, emulsion adhesives, double-sided tape, single-sided adhesive tape, etc. can be used to join (adhere) each part.

[0041] <Assembly of the cylinder> The packaging box 1 is shipped in a folded state and is manually formed by a worker (user) into a cylindrical shape capable of containing a product. The worker opens the folded packaging box 1 and gently folds the two sets of first to fifth side walls 11-15 along five vertical fold lines L1 and five inclined fold lines L2 to form a generally decagonal cylindrical body 2 (see FIG. 5, etc.). As shown in FIG. 5, the cylindrical body 2 is formed by connecting a pair of first side walls 11, a pair of second side walls 12, a pair of third side walls 13, a pair of fourth side walls 14, and a pair of fifth side walls 15 in the circumferential direction while facing each other across an axis A1. A decagonal bottom opening 2D is opened at the lower end of the cylindrical body 2, and a generally pentagonal top opening 2U (not shown) is opened at the upper end of the cylindrical body 2. The pair of first inner pieces 21, the pair of lid main body pieces 22, the pair of second inner pieces 23, the pair of lid locking pieces 24, and the pair of lid clamping pieces 25 are each shaped to be point-symmetrical about the axis A1. In more detail, since the shape of the cylindrical body 2 is not determined in this state, the bottom opening 2D, etc. are not maintained in a decagonal shape. Therefore, in reality, the pair of first side walls 11, etc. are not exactly opposite each other across the axis A1, and the pair of first inner pieces 21, etc. are not exactly arranged point-symmetrical about the axis A1, and the descriptions of each indicate approximate shapes.

[0042] <Assembling the bottom cover> Next, the worker closes the decagonal bottom opening 2D at the bottom end of the cylindrical body 2 with the bottom cover 3. When forming the bottom cover 3, the worker bends the pair of first inner pieces 21 and the pair of second inner pieces 23 inward along the bottom fold line L4, as shown in Figure 5. The first inner pieces 21 extend from the lower end of the first side wall 11 toward the axis A1, and the second inner pieces 23 extend from the lower end of the third side wall 13 toward the axis A1.

[0043] Next, as shown in Figure 6, the worker folds the pair of lid body pieces 22 inward along the bottom fold line L4, and interlocks the interlocking recesses 30 with each other near the axis A1. The pair of lid body pieces 22 overlap the surfaces of the pair of first inner pieces 21 and the pair of second inner pieces 23 that were folded prior to folding the pair of lid body pieces 22. As shown in Figures 6 and 7, when the pair of interlocking recesses 30 are interlocked, the narrow protrusion 32A on one side overlaps the surface of the lid body piece 22B on the other side, and the narrow protrusion 32B on the other side overlaps the surface of the lid body piece 22A on the other side. In this state, within the range of each interlocking recess 30, a portion of one lid body piece 22A excluding its tip end forms an insertion groove 36 with the surface of the other wide protrusion 31B, opening toward the other lid body piece 22B, and a portion of the other lid body piece 22B excluding its tip end forms an insertion groove 36 with the surface of one wide protrusion 31A, opening toward the one lid body piece 22A. In other words, one wide protrusion 31A faces the back surface of the other lid body piece 22B across the insertion groove 36, and the other wide protrusion 31B faces the back surface of the one lid body piece 22A across the insertion groove 36. The pair of insertion grooves 36 open in opposite directions along the center line A2, point-symmetrically about the axis A1.

[0044] As shown in FIG. 6 , the pair of lid body pieces 22 mesh with each other at their leading ends to completely close the bottom opening 2D. Because the pair of lid body pieces 22 are arranged so as to be in contact with the inner surface of the cylindrical body 2 (two sets of first to fifth side walls 11 to 15), the positions of the ten side walls 11 to 15 that make up the cylindrical body 2 are generally determined. In other words, because the shape of the cylindrical body 2 is generally determined, the bottom opening 2D and other portions are maintained in a decagonal shape. Furthermore, the pair of first inner pieces 21, the pair of second inner pieces 23, and the pair of lid body pieces 22 are arranged point-symmetrically about the axis A1 while forming a portion of the bottom cover 3. In this specification, the phrase "the pair of lid body pieces 22 completely close the bottom opening 2D" does not mean that the pair of lid body pieces 22 completely close the entire bottom opening 2D without any gaps, but means that a slight gap is allowed to exist around part or all of the periphery of each lid body piece 22.

[0045] Next, as shown in FIG. 8, the worker bends the pair of lid clamping pieces 25 inward along the bottom fold line L4 and places them on the surfaces of the pair of interlocked lid main body pieces 22. The pair of lid clamping pieces 25 are arranged on the surfaces of the lid main body pieces 22 without overlapping their tip ends. One lid clamping piece 25A is bent inward to overlap the narrow protrusion 32B of the other, and one guide protrusion 34A protrudes from the other narrow protrusion 32B toward the axis A1 and is placed on the surface of one lid main body piece 22A so as to be aligned with the opening (center line A2) of the insertion groove 36. The other lid clamping piece 25B is bent inward to overlap the narrow protrusion 32A, and the other guide protrusion 34B protrudes from the one narrow protrusion 32A toward the axis A1 and is placed on the surface of the other lid main body piece 22B so as to be aligned with the opening (center line A2) of the insertion groove 36. The pair of lid clamping pieces 25, forming part of the bottom lid portion 3, are arranged point-symmetrically with respect to the axis A1.

[0046] Next, as shown in Figures 9 and 10, the worker bends the pair of lid locking pieces 24 inward along the bottom fold line L4 so as to press down on the pair of narrow protrusions 32. The pair of lid locking pieces 24 are positioned on the surface of the lid main body piece 22 without overlapping their leading ends. One lid locking piece 24A sandwiches one lid clamping piece 25A to press down on the other narrow protrusion 32B, and the other lid locking piece 24B sandwiches the other lid clamping piece 25B to press down on one narrow protrusion 32A. The worker also inserts the insertion protrusions 33 of the pair of lid locking pieces 24 into the pair of insertion grooves 36 from opposite directions. One insertion protrusion 33A is inserted into the insertion groove 36 opening on the one lid main body piece 22A side, and the other insertion protrusion 33B is inserted into the insertion groove 36 opening on the other lid main body piece 22B side. 10, when the pair of insertion protrusions 33 are inserted into the pair of insertion grooves 36 to form the bottom cover 3, the pair of cover locking pieces 24 are arranged point-symmetrically about the axis A1 with the other side S2 roughly aligned with the center line A2. Note that the V-shaped notch of each insertion protrusion 33 engages with the wide protrusion 31 near the axis A1, preventing each insertion protrusion 33 from being easily pulled out.

[0047] As a result of the above, a decagonal bottom lid portion 3 is formed, and the decagonal bottom opening 2D is closed by the bottom lid portion 3 (see FIGS. 2 and 10). The worker places the product inside the cylindrical body 2 (above the bottom lid portion 3) from the top opening 2U.

[0048] <Deformation of the cylinder (top opening)> <Assembly of the top cover> Next, the worker closes the top opening 2U of the cylindrical body 2 with the top lid portion 4. To form the top lid portion 4, as shown in FIG. 11 , the worker folds the first top piece 41 inward along a pair of top fold lines L5 while folding the fifth side wall 15B (concave wall 18) back along the auxiliary fold line L3 to recess it. Next, the worker folds the second top piece 42 inward along the pair of top fold lines L5 while folding the second side wall 12A (concave wall 18) back along the auxiliary fold line L3 to recess it. The second top piece 42 overlaps the first top piece 41 so as to completely cover it, and the top insertion recess 46 is positioned near the axis A1.

[0049] Next, as shown in Figure 12, the worker folds each of the third top panels 43 inward along a pair of top fold lines L5 while folding the fourth side wall 14A and the third side wall 13B (concave wall 18) backward along auxiliary fold lines L3 to create a recess. The pair of third top panels 43 overlap to cover both sides of the first top panel 41 except for the central region, and the pair of top restriction protrusions 47 are positioned within the top insertion recess 46. In other words, the top insertion recess 46 is narrowed by the pair of top restriction protrusions 47.

[0050] Finally, as shown in FIG. 12, the worker folds the fourth top panel piece 44 inward along the pair of top fold lines L5 while folding the first side wall 11B (concave wall 18) backward along the auxiliary fold line L3 to create a recess. The worker then forward folds the insertion body piece 51 along the insertion fold line L7, forward folds the pair of insertion locking pieces 52 along the locking fold line L8, and while folding the fourth top panel piece 44, inserts the top insertion piece 50 into the top insertion recess 46 from between the pair of top restriction protrusions 47. The fourth top panel piece 44 overlaps the pair of third top panels 43, including the pair of top restriction protrusions 47, so as to cover them (see FIG. 1). The insertion body piece 51 is sunk into the interior of the cylindrical body 2 with the insertion fold line L7 approximately aligned with the bottom of the top insertion recess 46, and then returns to its original position due to the restoring force around the insertion fold line L7, overlapping the back surface of the second top panel piece 42 (not shown). The pair of insertion locking pieces 52 spread out due to the restoring force around the locking folding line L8, and overlap with the back surface of the second top panel piece 42 (not shown).

[0051] As described above, the five convex walls 17 and the five concave walls 18 are folded forward along the vertical fold lines L1 and the inclined fold lines L2, respectively, and the five concave walls 18 are folded backward along the auxiliary fold lines L3, respectively, to form the top opening 2U (see FIG. 11). Then, while the top opening 2U of the cylindrical body 2 is deformed into a star shape, the top lid portion 4 is assembled into the star shape to close the top opening 2U (see FIG. 1). The cylindrical body 2 has five vertical fold lines L1 and five inclined fold lines L2 protruding radially outward and five auxiliary fold lines L3 recessed radially inward (see FIGS. 1 and 2). The top lid 4 (top opening 2U) has a star shape in plan view, with corners at the intersections of the vertical fold line L1 and the inclined fold line L2, and recesses at the intersections of the auxiliary fold line L3 and a pair of top fold lines L5, with five corners and five recesses arranged alternately in the circumferential direction. The top lid 4 is also formed in a generally dome shape with a slight upward bulge near the axis A1 (see FIG. 1).

[0052] In this way, the packaging box 1 is sealed and the assembly of the packaging box 1 is completed (see FIG. 1). In order to prevent the top insert piece 50 from being pulled out of the top cover portion 4, adhesive tape (not shown) may be attached around the center (near the axis A1) where the first to fourth top surface pieces 41 to 44 are folded over.

[0053] In the packaging box 1 according to the present embodiment described above, a plurality of pieces 21-25 are connected to two sets of first to fifth side walls 11-15 that constitute the cylindrical body 2, which has a decagonal bottom opening 2D (see FIG. 3), and the bottom lid 3 that closes the bottom opening 2D is formed by combining the plurality of pieces 21-25. With this configuration, it is possible to form each of the pieces 21-25 to be smaller than the area of ​​the bottom opening 2D, and therefore each of the pieces 21-25 is less likely to tear from the cylindrical body 2 than if a single lid that completely closes the bottom opening 2D were connected to any one of the two sets of first to fifth side walls 11-15.

[0054] Furthermore, in the packaging box 1 according to this embodiment, when the bottom lid portion 3 is formed, a pair of interlocking recesses 30 are recessed at the tip ends of the pair of lid main body pieces 22 from the axis A1 to a position spaced apart from each other, and a pair of wide protrusions 31 adjacent to the interlocking recesses 30 on the axis A1 side and a pair of narrow protrusions 32 adjacent to the interlocking recesses 30 at a position spaced apart from the axis A1 are relatively protruding (see FIG. 3 ). When the tip ends of the pair of lid main body pieces 22 are interlocked with each other, the pair of lid main body pieces 22 have approximately the same size as the entire bottom opening 2D, so the pair of lid main body pieces 22 close the entire bottom opening 2D (see FIG. 6 ), and the positions of the ten side walls 11-15 constituting the decagonal prism-shaped cylindrical body 2 can be roughly determined. This allows the cylindrical body 2 to be maintained in a roughly decagonal prism shape, which facilitates and smooths the process of forming the bottom lid portion 3 that follows after folding the lid main body pieces 22.

[0055] Furthermore, in the packaging box 1 according to this embodiment, the pair of first inner pieces 21, the pair of second inner pieces 23, the pair of lid main body pieces 22, the pair of lid clamping pieces 25, and the pair of lid locking pieces 24, which are arranged point symmetrically, are folded in this order, and the insertion protrusions 33 of the pair of lid locking pieces 24 are inserted into the pair of insertion grooves 36, thereby completing the bottom lid portion 3. In this way, anyone can easily close the decagonal bottom opening 2D as long as they know the order in which to fold the multiple pieces 21 to 25.

[0056] In addition, in the packaging box 1 according to the present embodiment, the narrow-width convex portion 32 and the wide-width convex portion 31 are formed on the tip side of the lid body piece 22, and the narrow-width convex portion 32 protrudes shorter than the wide-width convex portion 31 (P2 < P1 (see FIG. 3)). According to this configuration, when the pair of lid body pieces 22 are bent and the engaging concave portions 30 thereof are engaged with each other, it becomes easier to insert the wide-width convex portion 31 inside the narrow-width convex portion 32 on the opposite side. As a result, the entire bottom opening 2D can be easily closed by the pair of lid body pieces 22.

[0057] In addition, according to the packaging box 1 according to the present embodiment, one (the other) lid sandwiching piece 25 is sandwiched between the other (one) narrow-width convex portion 32 and one (the other) lid locking piece 24 (see FIG. 10) and is held in a bent state with respect to the cylindrical body 2 (the fifth side wall 15). Therefore, the cylindrical body 2 can be properly held in a substantially decagonal column shape. Further, since the guide convex portion 34 of the lid sandwiching piece 25 is arranged along the opening of the insertion groove 36 (see FIG. 8), the insertion convex portion 33 of the lid locking piece 24 can be inserted into the insertion groove 36 while being guided along the guide convex portion 34.

[0058] In addition, according to the packaging box 1 according to the present embodiment, the plurality of pieces 21 to 25 are continuously provided at the lower ends of all the first to fifth side walls 11 to 15 and are bent toward the axial center A1 to form the bottom lid portion 3. Therefore, it is possible to prevent a gap from being formed between the cylindrical body 2 and the bottom lid portion 3 (see FIG. 10). As a result, it is possible to suppress the dropping of the product housed in the cylindrical body 2 and the intrusion of foreign matter from the outside.

[0059] In addition, according to the packaging box 1 according to the present embodiment, the second inner piece 23 and the lid locking piece 24 are formed so as not to straddle the virtual line V obtained by extending the vertical fold line L1 and the folding line L6 in the vertical direction (axial direction) (see FIG. 3). Therefore, the cylindrical body 2 can be properly folded along the vertical fold line L1 and the folding line L6. As a result, since the unfolded packaging box 1 (blank 1A) can be folded and bonded using a processing device, it becomes possible to mass-produce the packaging box 1 at a low cost.

[0060] Furthermore, in the packaging box 1 according to this embodiment, when forming the top opening 2U, each convex wall 17 and each concave wall 18 are folded forward along the vertical fold line L1 and the inclined fold line L2, so that each vertical fold line L1 and each inclined fold line L2 protrudes radially outward, and each concave wall 18 is folded backward along the auxiliary fold line L3, so that each auxiliary fold line L3 is recessed radially inward. This configuration allows for a packaging box 1 in which the bottom opening 2D of the cylindrical body 2 is formed in a decagonal shape and the top opening 2U of the cylindrical body 2 is formed in a star shape (see FIGS. 1 and 2). This gives the packaging box 1 an eye-catching appearance, which can enhance consumer appeal in stores where the packaging box 1 is displayed.

[0061] [Various variations] Various modified packaging boxes 1 will be described below. FIGS. 13 to 16 are plan views showing a blank 1A of a packaging box 1 according to first to fourth modified examples. In the following description, components identical to or corresponding to those of the packaging box 1 according to the present embodiment will be assigned the same reference numerals as those of the packaging box 1, and their description will be omitted. The rules for whether or not to add the reference numerals "A" and "B" will also be the same as those described above. For simplicity's sake, the packaging boxes 1 (blank 1A) according to the first to fourth modified examples shown in FIGS. 13 to 16 have a cylindrical body 2 formed in a decagonal prism shape, a top opening 2U that is decagonal rather than star-shaped, and a top lid 4 that is omitted. In addition to the packaging boxes 1 (blank 1A) according to the first to fourth modified examples, various other modified examples (not shown) will also be briefly described below.

[0062] In the packaging box 1 according to this embodiment, the inclined fold line L2 (auxiliary fold line L3) extends from the upper end downwards to the right in FIG. 3, but is not limited thereto and may extend from the upper end downwards to the left inclined (not shown).

[0063] In the packaging box 1 according to the present embodiment, the top lid portion 4 is formed by combining the first to fourth top surface pieces 41 to 44 that are connected to the upper end of the cylindrical body 2 (concave wall 18), but the present invention is not limited to this. For example, a single star-shaped top lid portion may be connected to the upper end of one concave wall 18 (not shown). Alternatively, a single top lid portion separated from the cylindrical body 2 may be arranged to close the top opening 2U and adhered to the front or back surface of the cylindrical body 2 (not shown).

[0064] Furthermore, in the packaging box 1 according to this embodiment, the top opening 2U of the cylindrical body 2 and the top lid 4 are formed in a star shape, but the present invention is not limited thereto. For example, the cylindrical body 2 may be formed in a decagonal prism shape with decagonal openings at both the top and bottom ends, and the top lid may be formed in a decagonal shape (not shown). In this case, the inclined fold line L2, the auxiliary fold line L3, etc. are not necessary, and the first to fifth side walls 11 to 15 are each formed in a substantially rectangular shape (see FIG. 13, etc.). In this case, the top lid 4 may have the same structure as the bottom lid 3, or a single decagonal top lid may be connected to the upper end of the cylindrical body 2 or attached as a separate part (neither is shown). Alternatively, the cylindrical body 2 may be formed in a decagonal prism shape, and the top lid may be omitted (see FIG. 13, etc.). In other words, the packaging box 1 may be in the shape of a tray with an open top.

[0065] Furthermore, in the bottom lid portion 3 of the packaging box 1 according to this embodiment, the insertion protrusion 33 of the lid locking piece 24 is formed in a generally fan shape, but is not limited to this, and for example, the insertion protrusion 33 may be formed in a quarter-circle shape (like a dolphin's dorsal fin) as shown in Fig. 13 (first modified example), or may be formed in a quadrangular shape as shown in Fig. 14 (second modified example). In other words, the shape of the insertion protrusion 33 can be freely changed.

[0066] Furthermore, in the bottom lid portion 3 of the packaging box 1 according to this embodiment, the lid clamping piece 25 has a guide protrusion 34 that is bent in a generally L-shape, and the guide protrusion 34 is arranged to straddle the center line A2 and follow the opening of the insertion groove 36. However, the present invention is not limited to this. For example, as shown in FIG. 13, the guide protrusion 35 may extend along the grain direction from the leading end of the lid clamping piece 25 (first modified example). In this case, one guide protrusion 35A does not straddle the center line A2 but is superimposed on the surface of the other lid main body piece 22B along the center line A2. The other guide protrusion 35B is superimposed on the surface of one lid main body piece 22A along the center line A2. Alternatively, as shown in FIG. 14, the guide protrusions 34, 35 may be omitted (second modified example).

[0067] Furthermore, in the bottom lid portion 3 of the packaging box 1 according to this embodiment, the lid clamping pieces 25 are separated from the lid locking pieces 24, but the present invention is not limited to this. For example, as shown in Fig. 14, the lid clamping pieces 25 may be connected to the lid locking pieces 24 via an isosceles triangular connecting piece 60 (second modified example). The lid locking pieces 24 and the lid clamping pieces 25 are connected to the connecting piece 60 via a connecting fold line L91 (e.g., a general-purpose crease). A circular relief hole 61 is opened at the intersection of the two connecting fold lines L91 and the bottom fold line L4. When forming the bottom lid 3, when the lid locking pieces 24 are bent inward, the lid clamping pieces 25 are bent inward in conjunction with this, and the connecting pieces 60 are folded backward relative to the lid clamping pieces 25 at the connecting fold line L91 and folded forward relative to the lid locking pieces 24 at the connecting fold line L91, and are sandwiched between the lid locking pieces 24 and the lid clamping pieces 25 (not shown). In this way, the lid locking pieces 24 and the lid clamping pieces 25 can be folded in conjunction with each other, which simplifies the process of forming the bottom lid 3.

[0068] Furthermore, in the bottom lid portion 3 of the packaging box 1 according to this embodiment, the first inner piece 21 and the second inner piece 23 are separated from the lid main body piece 22, but the present invention is not limited to this. For example, as shown in FIG. 15 , the first inner piece 21 and the second inner piece 23 may be connected to the lid main body piece 22 (third modified example). The first inner piece 21 and the second inner piece 23 are connected to the lid main body piece 22 via a connecting fold line L91. The first inner piece 21 and the second inner piece 23 are each formed in an isosceles triangle shape. A fold line L92 (e.g., a general-purpose crease) is formed in the first inner piece 21 and the second inner piece 23 so as to bisect the apex angle, and a relief groove 62 opens along the fold line L92. When forming the bottom lid portion 3, when the lid main body piece 22 is folded inward, the first inner piece 21 and the second inner piece 23 are in turn folded backward along the fold line L92 and forward along the bottom fold line L4 and the connecting fold line L91, and are overlapped on the back surface of the lid main body piece 22 in a double-folded state (not shown). In this way, the lid main body piece 22, the first inner piece 21, and the second inner piece 23 can be folded in conjunction with one another, which simplifies the process of forming the bottom lid portion 3. Note that only one of the first inner piece 21 and the second inner piece 23 may be connected to the lid main body piece 22 (not shown).

[0069] Furthermore, in the bottom lid portion 3 of the packaging box 1 according to this embodiment, the protrusion amount P2 of the narrow protrusion 32 is set to be smaller than the protrusion amount P1 of the wide protrusion 31, but this is not limiting, and for example, the protrusion amounts P1 and P2 may be the same, or the protrusion amount P2 may be larger than the protrusion amount P1 (not shown). Also, as shown in Fig. 16, when the mating recesses 30 of a pair of lid main body pieces 22 are mated, a portion of the wide protrusion 31 away from the axis A1 may be cut out to match the narrow protrusion 32 so that the narrow protrusion 32 can easily protrude to the surface side of the opposing lid main body piece 22 (fourth modified example).

[0070] Furthermore, the bottom lid portion 3 of the packaging box 1 according to this embodiment is configured by arranging the pair of first inner pieces 21, the pair of lid main body pieces 22, the pair of second inner pieces 23, the pair of lid locking pieces 24, and the pair of lid clamping pieces 25 point-symmetrically about the axis A1, but the present invention is not limited to this. For example, the pair of first inner pieces 21 and / or the pair of second inner pieces 23 may be omitted (not shown). Furthermore, the pair of lid clamping pieces 25 may also be omitted (not shown). That is, it is sufficient that the bottom lid portion 3 is provided with at least the pair of lid main body pieces 22 and the pair of lid locking pieces 24.

[0071] Furthermore, although the packaging box 1 according to this embodiment is made of a single sheet of paper (cardboard), the present invention is not limited to this. For example, it may be made of cardboard made of paper or a synthetic resin sheet. Furthermore, the grain direction of the single sheet of paper (cardboard) and the dimensions of each part may be changed as appropriate.

[0072] The above embodiment shows one aspect of the packaging box according to the present invention, and the technical scope of the present invention is not limited to the above embodiment. The present invention may be variously changed, substituted, or modified within the scope of the technical idea, and the claims include all embodiments that may fall within the scope of the technical idea. [Explanation of symbols]

[0073] 1 packaging box 2 cylinders 2D bottom opening (opening) 2U top opening 3 Bottom lid part (lid part) 4 Top cover 11 First side wall 12 Second side wall 13 Third side wall 14 Fourth Side Wall 15 5th side wall 17 Convex wall 18 concave wall 21 First inner section 22 Lid body piece 23 Second inner piece 24 Lid locking piece 25 Cover clamping piece 30 The concave part 31 convex parts 32 narrow convex parts 33 Different convex parts 34 The convex part inside the case 36 Chagogou A1 axis A2 center line L1 vertical line (boundary line) L2 inclined line L3 Subsidy Broken Line L5 fold curve L6 folding line (boundary line) P1, P2 protrusion V Fantasy Line

Claims

1. A packaging box (1) comprising a cylindrical body (2) having a decagonal opening (2D) at one end in the axial direction, and a decagonal lid (3) closing the opening, The cylindrical body is formed by connecting a pair of first side walls (11), a pair of second side walls (12), a pair of third side walls (13), a pair of fourth side walls (14), and a pair of fifth side walls (15) in a circumferential direction around an axis (A1) of the cylindrical body, with the axis (A1) being the center and the pair of first side walls (11), second side walls (12), third side walls (13), fourth side walls (14), and fifth side walls (15) facing each other across the axis (A1), The lid portion is a pair of lid body pieces (22) connected to one end of the pair of second side walls in the axial direction, having a shape that is point-symmetrical about the axis center, and whose tip ends engage with each other to close the entire opening; a pair of lid locking pieces (24) connected to one end of the pair of fourth side walls in the axial direction, shaped to be point-symmetrical about the axis, and disposed on the surface of the lid main body piece without overlapping the tip ends of each other; When the lid portion is formed, a pair of interlocking recesses (30) are recessed at the tip ends of the pair of lid body pieces between positions spaced apart from the axis, and a pair of wide protrusions (31) adjacent to the interlocking recesses on the axis side and a pair of narrow protrusions (32) adjacent to the interlocking recesses at positions spaced apart from the axis are relatively protruded, A pair of insertion protrusions (33) are provided on the tip ends of the pair of lid locking pieces so as to protrude in opposite directions from each other and extend parallel to the second side wall and beyond a center line (A2) passing through the axis when the lid portion is formed, When forming the lid portion, When the pair of lid body pieces are bent inward to engage with each other's engaging recesses near the axis, one narrow protrusion overlaps the surface of the other lid body piece, and the other narrow protrusion overlaps the surface of one of the lid body pieces, In this state, within the range of each of the interlocking recesses, a portion of one of the lid body pieces, excluding the tip side, forms an insertion groove (36) with the surface of the other wide protrusion, opening onto the other lid body piece, and a portion of the other lid body piece, excluding the tip side, forms an insertion groove (36) with the surface of one of the wide protrusions, opening onto the one lid body piece, A packaging box characterized in that one of the lid locking pieces is bent inward so as to press against the narrow protrusion on the other, one of the insertion protrusions is inserted into the insertion groove opening on one side of the lid body, and the other lid locking piece is bent inward so as to press against the narrow protrusion on one side, and the other insertion protrusion is inserted into the insertion groove opening on the other side of the lid body.

2. 2. The packaging box according to claim 1, wherein the protrusion amount (P2) of the narrow convex portion is smaller than the protrusion amount (P1) of the wide convex portion.

3. The lid portion further includes a pair of lid clamping pieces (25) that are connected to one end of the pair of fifth side walls in the axial direction, have a shape that is point-symmetrical about the axis, and are superimposed on the surfaces of the pair of interlocked lid main body pieces, A guide protrusion (34) is provided on the tip side of the lid clamping piece in a direction approaching the axis when the lid portion is formed, When forming the lid portion, After bending the pair of lid body pieces, one of the lid clamping pieces is bent inward to overlap the narrow convex portion of the other, one of the guide convex portions protrudes from the narrow convex portion of the other toward the axis center and is overlapped on the surface of one of the lid body pieces so as to fit along the opening of the insertion groove, the other lid clamping piece is bent inward to overlap one of the narrow convex portions, and the other guide convex portion protrudes from the narrow convex portion of one toward the axis center and is overlapped on the surface of the other lid body piece so as to fit along the opening of the insertion groove, The packaging box according to claim 1 or 2, characterized in that one of the lid locking pieces clamps one of the lid clamping pieces to press the other narrow convex portion, and the other lid locking piece clamps the other lid clamping piece to press one of the narrow convex portions.

4. The lid portion is a pair of first inner pieces (21) connected to one end of the pair of first side walls in the axial direction and having a shape that is point-symmetrical about the axis; a pair of second inner pieces (23) connected to one end of the pair of third side walls in the axial direction and shaped to be point-symmetrical about the axis center, The packaging box according to claim 3, characterized in that, when forming the lid portion, the pair of first inner pieces and the pair of second inner pieces are each folded inward prior to folding the pair of lid body pieces.

5. The cylindrical body is folded along boundary lines (L1, L6) formed parallel to the axial direction at positions corresponding to the second inner piece and the lid locking piece adjacent to each other, The packaging box according to claim 4, characterized in that the second inner piece and the lid locking piece adjacent to each other are formed so as not to straddle an imaginary line (V) extending from the boundary line in the axial direction.

6. The cylinder further includes a top cover (4) that closes a star-shaped top opening (2U) that opens at the upper end of the cylinder, which is the other end in the axial direction. The two sets of the first to fifth side walls (11 to 15) are connected in the circumferential direction via ten folding lines (L1, L2), The ten folding lines are: Five vertical folding lines (L1) extending parallel to the axial direction of the cylindrical body; Five inclined fold lines (L2) extending downward from the upper end of the vertical fold line while inclining in one direction in the circumferential direction, The five vertical fold lines and the five inclined fold lines are arranged alternately in the circumferential direction, The first side wall (11A), the third side wall (13A), the fifth side wall (15A), the second side wall (12B), and the fourth side wall (14B) each constitute a convex wall (17) formed in the shape of a right triangle with the vertical fold line as its hypotenuse and with the inclined fold line as its hypotenuse, The second side wall (12A), the fourth side wall (14A), the first side wall (11B), the third side wall (13B), and the fifth side wall (15B) each have a pair of top fold lines (L5) extending obliquely upward from the upper ends of adjacent pairs of vertical fold lines so as to approach each other, as a boundary with the top lid portion, and a concave wall (18) formed in a pentagonal shape by the vertical fold lines, the oblique fold lines, and their own lower edges, An auxiliary fold line (L3) is formed on the concave wall, inclined in the same direction as the inclined fold line between the lower end of the vertical fold line and the intersection of the pair of top fold lines, 3. The packaging box according to claim 1, wherein the top opening is formed by folding the five convex walls and the five concave walls forward along the vertical fold lines and the inclined fold lines, respectively, and folding the five concave walls backward along the auxiliary fold lines.

Images