Packaging box, packaging box intermediate, and method for manufacturing packaging box

Abstract

To provide an easily assembled packaging box, a packaging box intermediate, and a method for manufacturing the packaging box.SOLUTION: A packaging box 100 includes: frame plates 21 to 24 connected to an upper end of a target side plate of four side plates 11 to 14; and four bottom plates each extending one by one from a lower end of each of the four side plates 11 to 14. In a cylindrical body consisting of the four side plates 11 to 14, the first side plate 11, the second side plate 12, the third side plate 13, and the fourth side plate 14 are connected in this order, and a glue strip extending from one of adjacent ends of the first side plate 11 and the fourth side plate 14 is adhered to the other. The four bottom plates include two sets of bottom plates each consisting of a main bottom plate and a sub-bottom plate, and the sub-bottom plate is adhered to an attachment strip extending from the main bottom plate.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a packaging box, a packaging box intermediate, and a method for manufacturing a packaging box. [Background technology]

[0002] Packaging boxes with thick side surfaces have been known for some time. The edges of such packaging boxes extend in a strip shape with a certain width when viewed from a position facing the bottom of the packaging box, and therefore look like a picture frame surrounding the items contained in the packaging box (see, for example, Patent Document 1). Because the frame-like edges improve the appearance of the packaging, packaging boxes with such edges are widely used, for example, for packaging gift items. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility Model Registration No. 3188426 Summary of the Invention [Problem to be solved by the invention]

[0004] The packaging box is assembled from a single blank. During this process, the blank must be folded finely to form side sections on each of the four sides of the packaging box, creating a frame-like edge. This type of assembly requires more folding of the blank than does the assembly of a typical packaging box, which does not have a fixed edge width, resulting in increased labor and time required for the work. Furthermore, the only way to avoid this cumbersome assembly process when the packaging box is in use is to store the packaging box in its assembled state, but securing space for storing empty packaging boxes is a significant burden. [Means for solving the problem]

[0005] A packaging box, a packaging box intermediate, and a method for manufacturing a packaging box will be described below in order to solve the above problems. [Aspect 1] A packaging box having four side panels, namely a first side panel, a second side panel, a third side panel, and a fourth side panel, and having sides formed by these side panels, at least one of the four side panels being a target side panel, a frame panel connected to the upper end of the target side panel and extending in a strip shape along the upper end when viewed from a position facing the bottom surface of the packaging box, and four bottom panels extending one each from the lower end of the four side panels, and forming the bottom surface of the packaging box, A packaging box comprising a cylindrical body consisting of four side panels, the first side panel, the second side panel, the third side panel, and the fourth side panel being connected in this order, with a glue tab extending from one of adjacent ends of the first side panel and the fourth side panel being adhered to the other, and the four bottom panels including two sets of bottom panels each consisting of a main bottom panel and a secondary bottom panel, the main bottom panel and the secondary bottom panel extending from adjacent side panels in the cylindrical body, and the secondary bottom panel being adhered to an adhesive tab extending from the main bottom panel.

[0006] According to the above configuration, the first side panel and the fourth side panel are connected to each other, so that the four side panels form a continuous cylindrical shape. The frame panel and the bottom panel are connected to the cylindrical body. Therefore, the packaging box can be formed by lifting the cylindrical body from its folded state, so that a packaging box having a frame-shaped edge can be easily assembled.

[0007] [Aspect 2] The packaging box described in [Aspect 1] further includes an inner surface panel facing the target side panel, the inner surface panel having an upper end connected to the opposite side of the frame panel from the target side panel, and an auxiliary plate extending from the lower end of the inner surface panel, the auxiliary plate overlapping the target bottom panel, which is the bottom panel extending from the lower end of the target side panel.

[0008] According to the above-mentioned configuration, the strength of the bottom of the packaging box is increased, and the positions of the frame plate and the inner surface plate are easily stabilized.

[0009] [Aspect 3] The packaging box according to [Aspect 2], wherein the auxiliary plate is adhered to the target bottom plate. According to the above configuration, the frame plate and the target bottom plate move in conjunction with each other, so that the frame-shaped edge portion is assembled together with the assembly of the bottom portion, making it easier to assemble the packaging box.

[0010] [Aspect 4] A packaging box according to any one of [Aspect 1] to [Aspect 3], comprising an inner surface panel facing the target side panel, the upper end of which connects to the frame panel on the side opposite the target side panel, and the boundary portion between the frame panel and the inner surface panel is weaker than the boundary portion between the frame panel and the target side panel.

[0011] According to the above configuration, the boundary between the frame plate and the inner panel is more easily broken than the boundary between the frame plate and the target side panel. Therefore, it is possible to smoothly form a packaging box intermediate having a structure in which the frame plate extends along the upper edge of the target side panel when viewed from a position facing the side of the cylindrical body. In a packaging box intermediate having such a structure, the edge is formed by tilting the frame plate from the outside toward the inside of the cylindrical body. Therefore, the angle of the frame plate relative to the target side panel can be easily changed during the edge assembly, improving the workability of the edge assembly.

[0012] [Aspect 5] A packaging box according to any one of [Aspect 1] to [Aspect 4], in which three or more of the four side panels are the target side panels. According to the above configuration, since the packaging box has frames on three or more sides, the effect of improving the design by the frame-like edges can be suitably obtained. Furthermore, the packaging box having such frame-like edges can be easily assembled.

[0013] [Embodiment 6] An intermediate used in the manufacture of packaging boxes, comprising: a flat tubular body consisting of four side panels; at least one of the four side panels being a target side panel; a frame panel connected to the upper end of the target side panel and extending in a strip-like shape along the upper end; and four bottom panels located inside the tubular body, one connected to the lower end of each of the four side panels, wherein the four bottom panels include two pairs of bottom panels consisting of a main bottom panel and a secondary bottom panel, the main bottom panel and the secondary bottom panel being connected to adjacent side panels on the tubular body, and the secondary bottom panel being adhered to an adhesive piece extending from the main bottom panel.

[0014] According to the above configuration, the four side panels form a continuous cylindrical shape, and the frame panel and bottom panel are connected to the cylindrical body. Therefore, the packaging box can be formed by lifting the cylindrical body from its folded state, making it easy to assemble a packaging box with a frame-shaped edge. Furthermore, by storing the packaging box before assembly as a packaging box intermediate, it is possible to significantly reduce the space required for storage.

[0015] [Aspect 7] [Aspect 6] A method for manufacturing a packaging box using the packaging box intermediate described above, the method including: expanding the internal space of the cylindrical body to make the cylindrical body into a rectangular cylindrical shape; tilting down the four bottom plates so that the four bottom plates form the bottom surface of the packaging box; and changing the angle of the frame plate relative to the target side panel so that the frame plate extends in a band shape when viewed from a position opposite the bottom surface.

[0016] According to the above-described manufacturing method, a packaging box can be easily manufactured by using a packaging box intermediate, thereby reducing the labor and time required for assembling the packaging box. [Effects of the Invention]

[0017] According to the present invention, the packaging box can be easily assembled. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a perspective view showing a packaging box according to an embodiment. [Figure 2] FIG. 1 illustrates a blank according to an embodiment. [Figure 3] FIG. 1 illustrates a partially folded blank according to one embodiment. [Figure 4] FIG. 1 illustrates a partially folded blank according to one embodiment. [Figure 5] 1 is a diagram showing a side structure of a packaging box intermediate body according to an embodiment; [Figure 6] FIG. 10 is a diagram showing a packaging box in the middle of being assembled in one embodiment. [Figure 7] FIG. 10 is a diagram showing a packaging box in the middle of being assembled in one embodiment. [Figure 8] FIG. 2 is a diagram showing a planar structure of a packaging box according to an embodiment. [Figure 9] FIG. 2 is a diagram showing the bottom structure of a packaging box according to an embodiment. [Figure 10] FIG. 10 is a perspective view showing a packaging box according to a modified example. [Figure 11] FIG. 10 is a perspective view showing a packaging box according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0019] An embodiment of a packaging box, a packaging box intermediate, and a method for manufacturing a packaging box will be described with reference to Figures 1 to 9. In the following description, the up-down direction of the packaging box is the direction when the packaging box is placed on a horizontal surface.

[0020] [Overall structure of the packaging box] As shown in FIG. 1, the packaging box 100 is a box having a rectangular parallelepiped shape. The top surface of the packaging box 100 is open. The four side surfaces of the packaging box 100 are composed of a first side panel 11, a second side panel 12, a third side panel 13, and a fourth side panel 14. A first frame panel 21 extending along the upper end of the first side panel 11 is connected to the upper end of the first side panel 11. Similarly, a second frame panel 22 extending along the upper end of the second side panel 12 is connected to the upper end of the second side panel 12, a third frame panel 23 extending along the upper end of the third side panel 13 is connected to the upper end of the third side panel 13, and a fourth frame panel 24 extending along the upper end of the fourth side panel 14 is connected to the upper end of the fourth side panel 14.

[0021] When viewed from a position facing the bottom surface of the packaging box 100, each of the frame plates 21-24 has a strip shape, and these four frame plates 21-24 form a frame-like structure that surrounds the internal space of the packaging box 100. The object to be packaged in the packaging box 100, i.e., the item to be stored in the internal space, is not particularly limited. The dimensions of the width, depth, and height of the packaging box 100 may be designed according to the object to be packaged. Furthermore, the packaging box 100 may be used together with a bottom plate that is placed on the bottom surface of the packaging box 100 and a lid that is placed on the packaging box 100.

[0022] [Blank Configuration] The packaging box 100 is manufactured by assembling a packaging box intermediate formed from a single blank. First, the structure of the blank will be described. The blank is made of paper.

[0023] As shown in FIG. 2, in the blank 101, four side panels, namely, the first side panel 11, the second side panel 12, the third side panel 13, and the fourth side panel 14, are arranged in a row in this order, and adjacent side panels are connected via creases 90a-90c, which are folding lines. Each of the side panels 11-14 has a rectangular shape, and the first side panel 11 and the third side panel 13 have the same shape, and the second side panel 12 and the fourth side panel 14 have the same shape. An adhesive tab 60 is connected via crease 90d to the side of the first side panel 11 opposite the second side panel 12. The adhesive tab 60 is a portion that is adhered to the rear edge of the fourth side panel 14 when the packaging box intermediate is formed, and extends in a strip shape.

[0024] In this embodiment, of the two surfaces of the blank 101, the surface including the surface that will become the side surface of the packaging box 100 is referred to as the front surface 10F, and the surface opposite to the front surface 10F is referred to as the back surface 10R. The side surface of the packaging box 100 is the surface that faces the outside of the packaging box 100, in other words, the surface that is visible from the outside. In each part that constitutes the blank 101, the surface included in the front surface 10F is the front surface, and the surface included in the back surface 10R is the back surface. For example, the side surface of the packaging box 100 is the surface of the side panels 11 to 14. Figure 2 shows the blank 101 as seen from the front surface side. The up-down direction of the blank 101 and the packaging box intermediate body corresponds to the up-down direction of the packaging box 100 based on the side panels 11 to 14.

[0025] The first frame plate 21 is connected to the upper end of the first side panel 11 via a ruled line 91a. Similarly, the second frame plate 22 is connected to the upper end of the second side panel 12 via a ruled line 92a, the third frame plate 23 is connected to the upper end of the third side panel 13 via a ruled line 93a, and the fourth frame plate 24 is connected to the upper end of the fourth side panel 14 via a ruled line 94a. The first frame plate 21 and the third frame plate 23 have the same shape, and the second frame plate 22 and the fourth frame plate 24 have the same shape.

[0026] The first frame plate 21 and the third frame plate 23 each have a rounded shape with a curvature at both ends in the extension direction of the frame plates 21, 23. In other words, the edges of both ends are arc-shaped. On the other hand, the second frame plate 22 and the fourth frame plate 24 each have a linear shape that is inclined with respect to the extension direction of the frame plates 22, 24.

[0027] The first inner panel 31 is connected to the first frame panel 21 on the side opposite the first side panel 11 via a crease 91b. Similarly, the second inner panel 32 is connected to the second frame panel 22 on the side opposite the second side panel 12 via a crease 92b, the third inner panel 33 is connected to the third frame panel 23 on the side opposite the third side panel 13 via a crease 93b, and the fourth inner panel 34 is connected to the fourth frame panel 24 on the side opposite the fourth side panel 14 via a crease 94b.

[0028] Each of the inner surface plates 31-34 has a substantially rectangular shape. In the vertical direction, the length of each of the inner surface plates 31-34 is approximately the same as the length of each of the side surface plates 11-14 to which each of the inner surface plates 31-34 is connected via each of the frame plates 21-24, and is slightly shorter than the length of each of the side surface plates 11-14 by an amount corresponding to the thickness of the blank 101. In the left-right direction perpendicular to the vertical direction, the length of each of the inner surface plates 31-34 is shorter than the length of each of the side surface plates 11-14 to which each of the inner surface plates 31-34 is connected via each of the frame plates 21-24. The first inner surface plate 31 and the third inner surface plate 33 have the same shape, and the second inner surface plate 32 and the fourth inner surface plate 34 have the same shape.

[0029] A first auxiliary plate 41 is connected via a ruled line 91c to the first inner surface plate 31 on the side opposite the first frame plate 21. Similarly, a second auxiliary plate 42 is connected via a ruled line 92c to the second inner surface plate 32 on the side opposite the second frame plate 22, a third auxiliary plate 43 is connected via a ruled line 93c to the third inner surface plate 33 on the side opposite the third frame plate 23, and a fourth auxiliary plate 44 is connected via a ruled line 94c to the fourth inner surface plate 34 on the side opposite the fourth frame plate 24.

[0030] Each of the auxiliary plates 41 to 44 has, for example, a substantially trapezoidal shape with the side along the ruled line between each of the inner plates 31 to 34 as the bottom base. In the left-right direction, the length of each of the auxiliary plates 41 to 44 is shorter than the length of each of the inner plates 31 to 34 connected to each of the auxiliary plates 41 to 44. The first inner plate 31 and the third inner plate 33 have the same shape, and the second inner plate 32 and the fourth inner plate 34 have the same shape.

[0031] The first bottom plate 51 is connected to the lower end of the first side panel 11 via a crease 91d. Similarly, the second bottom plate 52 is connected to the lower end of the second side panel 12 via a crease 92d, the third bottom plate 53 is connected to the lower end of the third side panel 13 via a crease 93d, and the fourth bottom plate 54 is connected to the lower end of the fourth side panel 14 via a crease 94d.

[0032] The first bottom plate 51 has a generally trapezoidal shape with the ruled line 91d as the lower base, with a portion near the upper base cut out. This cut-out portion is the first hook portion 51H. In other words, the first hook portion 51H is a recess along the edge of the first bottom plate 51. Between the first bottom plate 51 and the second bottom plate 52, a first adhesive piece 55 is located, which is connected via the ruled line 91e to an end of the first bottom plate 51 that corresponds to the oblique side of the trapezoid. The second bottom plate 52 has a generally trapezoidal shape with the ruled line 92d as the lower base.

[0033] The first hook portion 51H faces the first adhesive piece 55 near the end of the first bottom plate 51 opposite the ruled line 91d. The plate-like member made up of the first bottom plate 51 and the first adhesive piece 55 has a generally rectangular shape with a trapezoidal shape cut out, the trapezoidal shape having a lower base along the side opposite the ruled line 91d. A first support piece 56 protrudes from the end of the first bottom plate 51 corresponding to the oblique side of the trapezoid toward the recess of the trapezoid, so that the first support piece 56 protrudes into the first hook portion 51H. The first bottom plate 51 and the first support piece 56 are connected via the ruled line 91f.

[0034] The first bottom plate 51 and the third bottom plate 53 have the same shape, and the second bottom plate 52 and the fourth bottom plate 54 have the same shape. That is, the third bottom plate 53 has a third hook portion 53H that is a recess along the edge of the third bottom plate 53, and a third adhesive piece 57 located between the third bottom plate 53 and the fourth bottom plate 54 is connected to the third bottom plate 53 via a ruled line 93e. A third support piece 58 extends from the third bottom plate 53 via a ruled line 93f, and protrudes into the third hook portion 53H.

[0035] The positions of the creases in the blank 101 are weakened, making them more susceptible to breaking due to external forces than other positions. The weakening can be achieved, for example, by reducing the thickness through half-cutting or scoring, or by perforating or embossing.

[0036] In the blank 101, the boundary portions between each of the frame panels 21-24 and each of the inner panel panels 31-34 are weaker than the boundary portions between each of the frame panels 21-24 and each of the side panel panels 11-14. That is, the blank 101 is more likely to break at the positions of the creases 91b, 92b, 93b, and 94b than at the positions of the creases 91a, 92a, 93a, and 94a. For example, the positions of the creases 91b, 92b, 93b, and 94b are made thinner or thicker than the positions of the creases 91a, 92a, 93a, and 94a, thereby imparting greater fragility to the blank.

[0037] [Composition of intermediate packaging box] A description will be given of a packaging box intermediate formed from the blank 101. Figures 3 and 4 are views of a structure in which a portion of the blank 101 is folded, viewed from the back side of each of the side panels 11 to 14. In the following description, valley folds and mountain folds refer to folding directions based on the front surface 10F of the blank 101.

[0038] As shown in Fig. 3, mountain folds are made at the boundary portions between each of the frame panels 21-24 and each of the inner panel panels 31-34, and valley folds are made at the boundary portions between each of the inner panel panels 31-34 and each of the auxiliary panels 41-44. That is, the blank 101 is mountain-folded at each of the creases 91b, 92b, 93b, and 94b, and valley-folded at each of the creases 91c, 92c, 93c, and 94c. In this state, the surface of each of the auxiliary panels 41-44 facing towards the viewer in Fig. 3 is the back surface of each of the auxiliary panels 41-44.

[0039] As shown in Fig. 4, furthermore, the boundary portions between each of the side panels 11-14 and each of the bottom panels 51-54 are mountain-folded. That is, the blank 101 is mountain-folded at each of the ruled lines 91d, 92d, 93d, and 94d. As a result, the first auxiliary panel 41 and the first bottom panel 51 overlap, the second auxiliary panel 42 and the second bottom panel 52 overlap, the third auxiliary panel 43 and the third bottom panel 53 overlap, and the fourth auxiliary panel 44 and the fourth bottom panel 54 overlap. The shape of each of the auxiliary panels 41-44 is set so that each of the auxiliary panels 41-44 does not protrude from each of the overlapping bottom panels 51-54.

[0040] At this time, the overlapping bottom plates 51 to 54 are attached to the auxiliary plates 41 to 44. Specifically, the back surface of the first auxiliary plate 41 is adhered to the back surface of the first bottom plate 51, the back surface of the second auxiliary plate 42 is adhered to the back surface of the second bottom plate 52, the back surface of the third auxiliary plate 43 is adhered to the back surface of the third bottom plate 53, and the back surface of the fourth auxiliary plate 44 is adhered to the back surface of the fourth bottom plate 54.

[0041] For each bottom plate 51-54 and each auxiliary plate 41-44 that are bonded together, the structure consisting of the first auxiliary plate 41 and the first bottom plate 51 is the first bottom flap 71, the structure consisting of the second auxiliary plate 42 and the second bottom plate 52 is the second bottom flap 72, the structure consisting of the third auxiliary plate 43 and the third bottom plate 53 is the third bottom flap 73, and the structure consisting of the fourth auxiliary plate 44 and the fourth bottom plate 54 is the fourth bottom flap 74.

[0042] Furthermore, the boundary between the first bottom plate 51 and the first adhesive piece 55 and the boundary between the third bottom plate 53 and the third adhesive piece 57 are valley-folded. That is, the blank 101 is valley-folded at each of the creases 91e and 93e. In this state, the surfaces of the adhesive pieces 55 and 57 facing towards the viewer in FIG. 4 are the back surfaces of the adhesive pieces 55 and 57. The surfaces of the second bottom plate 52 and the fourth bottom plate 54 facing towards the viewer in FIG. 4 are the front surfaces of the bottom plates 52 and 54.

[0043] Then, the boundary between the first side panel 11 and the second side panel 12 and the boundary between the third side panel 13 and the fourth side panel 14 are mountain-folded. That is, the blank 101 is mountain-folded along the crease 90a and the crease 90c. As a result, the first adhesive piece 55 and the second bottom panel 52 overlap, and the third adhesive piece 57 and the fourth bottom panel 54 overlap. At this time, the back surface of the first adhesive piece 55 is adhered to the front surface of the second bottom panel 52, and the back surface of the third adhesive piece 57 is adhered to the front surface of the fourth bottom panel 54. The shapes of the adhesive pieces 55, 57 are set so that the adhesive pieces 55, 57 do not protrude from the overlapping bottom panels 52, 54. In addition, the front surface of the adhesive tab 60 is adhered to the rear edge of the fourth side panel 14.

[0044] This forms the packaging box intermediate 102 shown in Fig. 5. Note that, as long as the folding positions and bonding positions of the blank 101 are as described above, the folding order and bonding order of each part may be different from those described above.

[0045] The packaging box intermediate 102 includes a flat tubular body 70 made up of four side panels 11-14, and four frame panels 21-24 extend from the upper end of the tubular body 70. The lines 91a, 92a, 93a, and 94a between the side panels 11-14 and the frame panels 21-24 are not folded, and the surfaces of the side panels 11-14 and the surfaces of the frame panels 21-24 connected to the side panels 11-14 form a single plane.

[0046] The inner surface plates 31-34 and the bottom flaps 71-74 are located inside the cylindrical body 70. At the center in the left-right direction, the ends of the first bottom plate 51 and the third bottom plate 53 protrude upward from the inside of the cylindrical body 70.

[0047] A line production system using a glue processing device can be applied to form the packaging box intermediate 102 from the blank 101. Therefore, the packaging box intermediate 102 can be manufactured efficiently.

[0048] In the process of forming the packaging box intermediate 102, when folding the boundary portions between the frame plates 21-24 and the inner panel plates 31-34, because the frame plates 21-24 are thin, external force is also likely to be applied to the boundary portions between the frame plates 21-24 and the side panel plates 11-14. At this time, if the boundary portions between the frame plates 21-24 and the inner panel plates 31-34 are weaker than the boundary portions between the frame plates 21-24 and the side panel plates 11-14, only the boundary portions between the frame plates 21-24 and the inner panel plates 31-34 will be easily folded.

[0049] Therefore, a structure can be smoothly formed in which the boundary portions between each frame plate 21-24 and each inner surface plate 31-34 are folded and the boundary portions between each frame plate 21-24 and each side surface plate 11-14 are stretched, i.e., a structure in which each frame plate 21-24 extends along the upper end of each side surface plate 11-14 when viewed from a position facing the side of the cylindrical body 70.

[0050] [Manufacturing method of packaging boxes] A method for manufacturing the packaging box 100 using the packaging box intermediate 102 will be described. 6, for the tubular body 70 of the packaging box intermediate 102, the first side panel 11 and the fourth side panel 14 are separated from the second side panel 12 and the third side panel 13 to expand the internal space of the tubular body 70 so that the tubular body 70 becomes a rectangular tube. At this time, the boundary portions between the side panels 11-14 and the frame panels 21-24 are mountain-folded along the lines 91a, 92a, 93a, and 94a, and the frame panels 21-24 are laid horizontally, and the bottom flaps 71-74 are also laid horizontally.

[0051] 7, the first hook portion 51H of the first bottom plate 51 and the third hook portion 53H of the third bottom plate 53 are hooked together. At this time, the first support piece 56 of the first bottom plate 51 and the third support piece 58 of the third bottom plate 53 are pinched together to hook the hook portions 51H and 53H together, thereby easily engaging the hook portions 51H and 53H. In particular, because the bases of the support pieces 56 and 58 can be bent along the creases 91f and 93f, the operation of pinching the support pieces 56 and 58 to hook the first hook portion 51H and the third hook portion 53H together while laying the bottom flaps 71 to 74 horizontally can be more easily performed.

[0052] During the assembly process, the frame panels 21-24 and the bottom flaps 71-74 are laid horizontally, forming a structure in which the side panels 11-14 and the inner panels 31-34 sandwiching the frame panels 21-24 are vertically and parallel to each other. Furthermore, the engagement of the hooks 51H and 53H stabilizes the positions of the bottom flaps 71-74 and the components connected to them. After the hooks 51H and 53H are engaged, the lines 91f and 93f are extended to lay the support pieces 56 and 58 horizontally, forming a substantially flat bottom. This completes the packaging box 100, which has an internal space defined by the inner panels 31-34 and the bottom flaps 71-74.

[0053] FIG. 8 is a plan view of the assembled packaging box 100, and FIG. 9 is a bottom view of the assembled packaging box 100. 8, the four inner surface plates 31-34 are positioned inward from the four side surface plates 11-14 by a length corresponding to the width of each of the frame plates 21-24. The first inner surface plate 31 faces the first side surface plate 11, and its upper ends are connected to the first frame plate 21. Similarly, the second inner surface plate 32 faces the second side surface plate 12, and their upper ends are connected to the second frame plate 22, the third inner surface plate 33 faces the third side surface plate 13, and their upper ends are connected to the third frame plate 23, and the fourth inner surface plate 34 faces the fourth side surface plate 14, and their upper ends are connected to the fourth frame plate 24.

[0054] The diameter of the rectangular tube made up of the four side panels 11-14 and the diameter of the rectangular tube made up of the four inner panel 31-34 have a difference corresponding to the outer and inner peripheral edges of the ring made up of the four frame panels 21-24. The rectangular tube has a rectangular cross section. Bottom panels 51-54 extend from the lower ends of the side panels 11-14, respectively, and auxiliary panels 41-44 extend from the lower ends of the inner panel 31-34, respectively.

[0055] The edges of the first frame plate 21 and the third frame plate 23 overlap the edges of the second frame plate 22 and the fourth frame plate 24. Because the edges of the frame plates 22 and 24 are oblique, they can easily slip under the edges of the frame plates 21 and 23 without getting caught on the surrounding area. On the other hand, because the edges of the frame plates 21 and 23 bulge in an arc, gaps are prevented from forming at the intersections of the edges of the frame plates 21 to 24. As a result, only the rounded edges of the frame plates 21 and 23 are visible at the intersections of the edges of the frame plates 21 to 24, improving the appearance of the packaging box 100.

[0056] If the vertical length of the first side panel 11 and the third side panel 13 is slightly longer than the vertical length of the second side panel 12 and the fourth side panel 14, and the upper ends of the first side panel 11 and the third side panel 13 are positioned slightly higher than the upper ends of the second side panel 12 and the fourth side panel 14 in the vertical direction, then when assembling the packaging box 100 from the packaging box intermediate 102, the ends of the first frame panel 21 and the third frame panel 23 are likely to be positioned above the ends of the second frame panel 22 and the fourth frame panel 24.

[0057] At the bottom of the packaging box 100, the auxiliary plates 41 to 44 are fixed to the bottom plates 51 to 54 so that the auxiliary plates 41 to 44 overlap the bottom plates 51 to 54. The bottom flaps 71 to 74, which are stacks of the bottom plates 51 to 54 and the auxiliary plates 41 to 44, overlap each other in a staggered manner, thereby forming the bottom of the packaging box 100.

[0058] Specifically, a portion of the first bottom flap 71 overlaps the fourth bottom flap 74, and another portion of the first bottom flap 71 overlaps under the second bottom flap 72. Similarly, a portion of the second bottom flap 72 overlaps the first bottom flap 71, and another portion of the second bottom flap 72 overlaps under the third bottom flap 73. Also, a portion of the third bottom flap 73 overlaps the second bottom flap 72, and another portion of the third bottom flap 73 overlaps under the fourth bottom flap 74. Furthermore, a portion of the fourth bottom flap 74 overlaps the third bottom flap 73, and another portion of the fourth bottom flap 74 overlaps under the first bottom flap 71.

[0059] The bottom surface of the packaging box 100 is the inner surface of the packaging box 100 and is composed of the bottom flaps 71-74, i.e., the bottom plates 51-54 and the auxiliary plates 41-44. There are no particular limitations on the proportion of the bottom plates 51-54 that are covered by the auxiliary plates 41-44. The greater the proportion that is covered, the stronger the bottom of the packaging box 100 will be.

[0060] 9, the first adhesive piece 55 and the third adhesive piece 57 are entirely located on the bottommost surface of the packaging box 100, in other words, on the outermost bottom surface. The boundary between the first bottom plate 51 and the first adhesive piece 55 and the boundary between the third bottom plate 53 and the third adhesive piece 57, i.e., the respective ruled lines 91e and 93e, are stretched.

[0061] In the above configuration, the four bottom plates 51-54 are composed of main bottom plates, which are bottom plates 51, 53 with the adhesive pieces 55, 57 extending therefrom, and sub-bottom plates, which are bottom plates 52, 54 adhered to the adhesive pieces 55, 57, and can be considered to include two pairs of main and sub bottom plates. Each pair of main and sub bottom plates is connected to the lower end of the adjacent side panel. The main bottom plates have hooks, allowing the two main bottom plates to be hooked onto each other. In this embodiment, the first and third bottom plates 51, 53 are each main bottom plates, and the second and fourth bottom plates 52, 54 are each sub-bottom plates. The first and second bottom plates 51, 52 form one pair of main and sub bottom plates, and the third and fourth bottom plates 53, 54 form another pair of main and sub bottom plates.

[0062] According to this embodiment, a cylindrical body 70 made up of four side plates 11-14 that form the sides of the packaging box 100 is folded to form a packaging box intermediate body 102. The frame plates 21-24 and the bottom plates 51-54 are connected to the cylindrical body 70. Therefore, by lifting the cylindrical body 70 and folding each part, the packaging box 100 having a frame-shaped edge can be easily formed.

[0063] In particular, because the auxiliary plates 41-44 extending from the inner plates 31-34 to which the frame plates 21-24 are connected are fixed to the bottom plates 51-54, the frame plates 21-24 and the bottom plates 51-54 move in unison. Therefore, the frame-shaped edges are assembled together with the bottom, making it easier to assemble the packaging box 100. Furthermore, because the auxiliary plates 41-44 are fixed to the bottom plates 51-54, the positions of the frame plates 21-24 and the inner plates 31-34 relative to the side plates 11-14 are accurately determined when assembling the edges.

[0064] In addition, the bottom portion is also made up of main bottom plates 51, 53 and secondary bottom plates 52, 54, which are connected and folded by adhesive pieces 55, 57, so that the bottom portion can be easily assembled without requiring complex interlocking of flaps.

[0065] In this way, by using the packaging box intermediate 102, it is possible to reduce the labor and time required to assemble the packaging box 100. It also reduces the difference in the time required to assemble the packaging box 100 and the quality of the finished product that may occur depending on the level of experience of the assembling worker. Furthermore, by storing the packaging box 100 in an unassembled state, i.e., as the packaging box intermediate 102, it is possible to significantly reduce the space required for storage.

[0066] As described above, according to the above embodiment, the following effects can be obtained. (1) In the packaging box intermediate 102, the cylindrical body 70, which is made up of the four side panels 11 to 14, is folded in a state in which the frame panels 21 to 24 and the bottom panels 51 to 54 are connected to the cylindrical body 70. Therefore, by lifting the cylindrical body 70 and folding each part, the packaging box 100 having a frame-shaped edge can be easily formed. Furthermore, by storing the packaging box 100 before assembly as the packaging box intermediate 102, the space required for storing the packaging box 100 can be reduced.

[0067] (2) The auxiliary plates 41 to 44 are provided so as to overlap the bottom plates 51 to 54. This makes it easier to stabilize the positions of the frame plates 21 to 24 and the inner surface plates 31 to 34. Furthermore, the strength of the bottom of the packaging box 100 is increased.

[0068] (3) Since the auxiliary plates 41 to 44 are adhered to the bottom plates 51 to 54, the frame plates 21 to 24 and the bottom plates 51 to 54 move in unison. This makes it easier to assemble the packaging box 100.

[0069] (4) The boundary portions between each of the frame plates 21-24 and each of the inner surface plates 31-34 are weaker than the boundary portions between each of the frame plates 21-24 and each of the side surface plates 11-14. Therefore, it is possible to smoothly form a structure in which the boundary portions between each of the frame plates 21-24 and each of the inner surface plates 31-34 are folded and the boundary portions between each of the frame plates 21-24 and each of the side surface plates 11-14 are stretched, that is, a structure in which each of the frame plates 21-24 extends along the upper end of each of the side surface plates 11-14 when viewed from a position facing the side surface of the cylindrical body 70.

[0070] If the packaging box intermediate 102 has this structure, the frame-shaped edge can be assembled by folding each of the frame plates 21-24 from the outside toward the inside of the cylindrical body 70. In contrast, if only the boundary portions between each of the frame plates 21-24 and each of the side panels 11-14 are folded, assembling the frame-shaped edge requires lifting each of the frame plates 21-24 from the inside toward the outside of the cylindrical body 70. When the frame plates 21-24 are folded from the outside toward the inside of the cylindrical body 70, it is easier to accurately apply external force to each of the frame plates 21-24, and it is also easier to change the angle of each of the frame plates 21-24 relative to each of the side panels 11-14 so that the angle between each of the side panels 11-14 and each of the frame plates 21-24 is a right angle. This improves the workability of assembling the edge.

[0071] Furthermore, when bonding the auxiliary plates 41-44 to the bottom plates 51-54, the boundary portions between the frame plates 21-24 and the inner plates 31-34 are folded and the boundary portions between the frame plates 21-24 and the side plates 11-14 are stretched, thereby realizing a packaging box intermediate 102 in which the angles of the frame plates 21-24 and the bottom plates 51-54 are changed in conjunction with each other. If the boundary portions between the frame plates 21-24 and the inner plates 31-34 are weaker than the boundary portions between the frame plates 21-24 and the side plates 11-14, such a structure can be smoothly formed.

[0072] [Variations] The above embodiment may be modified as follows: The following modifications may be combined with each other.

[0073] At least one of the four auxiliary plates 41-44 does not have to be attached to the bottom plate. For example, the auxiliary plates extending from two opposing inner surface plates may be attached to the bottom plate, while the other two auxiliary plates may not be attached to the bottom plate. This configuration simplifies the process of forming the packaging box intermediate 102 from the blank 101. Even if the auxiliary plates are not attached to the bottom plate, the packaging box 100 having a frame-shaped edge can be easily assembled by raising the tubular body 70 of the packaging box intermediate 102 and laying the frame plates 21-24 and the bottom plates 51-54 horizontally. The auxiliary plates not attached to the bottom plate can be manually positioned so that they overlap the bottom plate during assembly.

[0074] When the auxiliary plates are not attached to the bottom plate, in the packaging box intermediate 102, the boundary portions between the frame plates 21-24 and the inner surface plates 31-34 may be stretched, and the boundary portions between the frame plates 21-24 and the side surface plates 11-14 may be folded. In other words, the frame plates 21-24 may be located inside the cylindrical body 70 as long as they extend along the upper ends of the side surface plates 11-14. Furthermore, the packaging box 100 and the packaging box intermediate 102 do not have to have at least one of the four auxiliary plates 41-44.

[0075] Instead of an auxiliary plate, a bottom plate laid along the bottom surface of the packaging box 100 may be connected to the lower end of at least one of the four inner panel panels 31-34. For example, FIG. 10 shows a packaging box 105 having a configuration in which a bottom plate 45 is connected to the lower end of the third inner panel panel 33 via a ruled line 93g. The bottom plate 45 extends from the lower end of the third inner panel panel 33 and entirely covers the bottom panels 51-54 and auxiliary panels 41, 42, and 44 that constitute the bottom surface of the packaging box 105. This makes the inner bottom surface of the packaging box 105 flat, improving the appearance of the packaging box 105. Furthermore, the burden of managing the components is reduced compared to when a bottom plate separate from the packaging box is used.

[0076] The bottom plate 45 may have a partition section that rises up inside the packaging box 105. The partition section that extends in the vertical direction is formed by folding the bottom plate 45 so that a portion thereof protrudes in a mountain shape midway along its extension. With this configuration, the partition section can separate the storage area for items in the packaging box 105. Furthermore, compared to using a partition member that is separate from the packaging box, the burden of managing the components is reduced.

[0077] The packaging box only needs to have at least one frame plate. In other words, at least one of the four side panels 11 to 14 needs to be connected to a frame plate. The number of frame plates can be selected within the range of 1 to 4 depending on the desired packaging box design.

[0078] For example, Figure 11 shows a packaging box 106 having three frame panels 21, 22, and 24, and a lid panel 80 connected to the upper end of the third side panel 13 via a crease 93h instead of the third frame panel 23. An insertion piece 81 extends from the tip of the lid panel 80. The lid of the packaging box 106 can be closed by folding the lid panel 80 along the crease 93h and tilting it over so that the lid panel 80 covers the top opening of the packaging box 106, and then inserting the insertion piece 81 into the interior space of the packaging box 106 along the first inner panel 31. This configuration allows the packaging box 106 to have a lid, which reduces the burden of managing the components compared to using a lid separate from the packaging box. The packaging box may have a structure in which a cover plate extends from one side panel and a bottom plate extends from an inner panel facing the other side panel.

[0079] The boundary portions between each of the frame panels 21-24 and each of the inner panels 31-34 may be equally fragile as the boundary portions between each of the frame panels 21-24 and each of the side panels 11-14, or the boundary portions between each of the frame panels 21-24 and each of the side panels 11-14 may be more fragile. In addition, some of the ruled lines, such as those at the boundary portions between each of the frame panels 21-24 and each of the inner panels 31-34, may have decorative features other than simple straight lines.

[0080] If the sub-bottom plate is attached to an attachment plate extending from the main bottom plate and the ends of the main bottom plate are engaged with each other, the support pieces 56, 58 do not need to be provided. In the cylindrical body 70, as long as the first side panel 11, the second side panel 12, the third side panel 13, and the fourth side panel 14 are arranged in this order, the adhesive tab 60 may extend from the fourth side panel 14 and be adhered to the first side panel 11. In addition, in the above embodiment, a main bottom panel is connected to each of the first side panel 11 and the third side panel 13, and a sub-bottom panel is connected to each of the second side panel 12 and the fourth side panel 14. However, a sub-bottom panel may be connected to each of the first side panel 11 and the third side panel 13, and a main bottom panel may be connected to each of the second side panel 12 and the fourth side panel 14. That is, in the cylindrical body 70, it is sufficient that the side panels connected to the main side panels and the side panels connected to the sub-side panels are arranged alternately. [Explanation of symbols]

[0081] 11,12,13,14…Side plate 21, 22, 23, 24...Frame boards 31,32,33,34…Inner plate 41,42,43,43…auxiliary board 45... Sole board 51,52,53,54…bottom plate 51H, 53H...Hook section 55,57...Support piece 56,58...Adhesive strips 60…Glue allowance piece 70...Cylindrical body 71, 72, 73, 74...Bottom flaps 80…Lid plate 81...insertion piece 90a~90d, 91a~91f, 92a~92d, 93a~93h, 94a~94d...Ruled 100,105,106…Packaging box 101...Blank 102...Packaging box intermediate

Claims

1. A packaging box having four side panels, i.e., a first side panel, a second side panel, a third side panel, and a fourth side panel, and having sides formed by these side panels, At least one of the four side panels is a target side panel; A frame plate connected to the upper end of the target side plate, the frame plate extending in a strip shape along the upper end when viewed from a position facing the bottom surface of the packaging box; and four bottom plates extending one by one from the lower end of each of the four side panels, the four bottom plates constituting the bottom surface of the packaging box; In the cylindrical body consisting of the four side panels, the first side panel, the second side panel, the third side panel, and the fourth side panel are connected in this order, and a glue strip extending from one of adjacent ends of the first side panel and the fourth side panel is bonded to the other end, The four bottom plates include two sets of bottom plates each consisting of a main bottom plate and a sub-bottom plate, the main bottom plate and the sub-bottom plate extend from adjacent side plates of the cylindrical body, and the sub-bottom plate is adhered to an attachment piece extending from the main bottom plate. packaging box.

2. An inner surface plate facing the target side plate, the upper end of which is connected to the opposite side of the target side plate in the frame plate; The support plate further includes an auxiliary plate extending from a lower end of the inner surface plate and overlapping a target bottom plate, the bottom plate being the bottom plate extending from a lower end of the target side surface plate. The packaging box according to claim 1.

3. The auxiliary plate is bonded to the target bottom plate. The packaging box according to claim 2.

4. An inner surface plate facing the target side plate, the upper end of the inner surface plate being connected to the opposite side of the target side plate in the frame plate, The boundary portion between the frame plate and the inner surface plate is weaker than the boundary portion between the frame plate and the target side surface plate. The packaging box according to claim 1.

5. Three or more of the four side panels are the target side panels. The packaging box according to claim 1.

6. An intermediate used in the manufacture of packaging boxes, A flat cylindrical body consisting of four side panels; At least one of the four side panels is a target side panel, and a frame panel is connected to an upper end of the target side panel and extends in a strip shape along the upper end; four bottom plates located inside the cylindrical body and connected to the lower ends of the four side plates, The four bottom plates include two sets of bottom plates each consisting of a main bottom plate and a sub-bottom plate, the main bottom plate and the sub-bottom plate are connected to the adjacent side plates of the cylindrical body, and the sub-bottom plate is bonded to an attachment piece extending from the main bottom plate. Packaging box intermediate.

7. A method for manufacturing a packaging box using the packaging box intermediate body according to claim 6, comprising the steps of: Expanding an internal space of the cylindrical body to form the cylindrical body into a rectangular cylindrical shape; folding down the four bottom plates so that the four bottom plates form a bottom surface of the packaging box; Changing an angle of the frame plate relative to the target side plate so that the frame plate extends in a strip shape when viewed from a position facing the bottom surface; A method for manufacturing a packaging box comprising the steps of:

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