cushioning material

Abstract

To provide a technique capable of preventing strength of a buffer material from deteriorating, while reducing the material area of the buffer material.SOLUTION: A buffer material assembled by folding one sheet comprises a single-layered square cylindrical body part that constitutes an outer edge of the buffer material, a first diagonally supporting plate and a second diagonally supporting plate that are extended along respective diagonal lines inside the square cylindrical body, and a claw part for holding a shape after assembled. The first diagonally supporting plate is continuous to the square cylindrical body part; the second diagonally supporting plate is continuous to the first diagonally supporting plate; and the first diagonally supporting plate and the second diagonally supporting plate are made to be in X-shape by folding the sheet to assemble the square cylindrical body part.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a cushioning material.

Background Art

[0002] Conventionally, there has been proposed a cushioning material in the form of a rectangular parallelepiped that can be assembled by sequentially folding sheets made of cardboard or plastic cardboard (for example, Patent Document 1 and Patent Document 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the cushioning materials described in Patent Document 1 and Patent Document 2, there are surfaces where the sheets are double-layered. If there are surfaces where the sheets are double-layered in the assembled state, there is a problem that the material area of the sheets increases. Further, in the cushioning material described in Patent Document 2, in a mode where there is no surface where the sheets are double-layered, it is necessary to close the depressions unintentionally formed at the corners of the rectangular parallelepiped with tape or the like, and there is a risk that the strength of the cushioning material may decrease. For this reason, there has been a demand for a technique capable of suppressing a decrease in the strength of the cushioning material while reducing the material area of the cushioning material.

Means for Solving the Problems

[0005] The present disclosure can be realized in the following forms.

[0006] (1) According to one embodiment of the present invention, a cushioning material is provided. This cushioning material is assembled by folding a single sheet, and comprises a single rectangular tube portion forming the outer edge of the cushioning material, a first diagonal support plate and a second diagonal support plate extending along the diagonals inside the rectangular tube portion, and claw portions for maintaining the shape after assembly, the sheet is substantially rectangular in shape in its pre-assembly state, having a first side and a second side that are substantially perpendicular to each other, the sheet has a substantially rectangular first region having the length of the diagonal of the first side and where the first diagonal support plate and the second diagonal support plate are formed, a substantially rectangular second region connected to the first region and forming the rectangular tube portion, a first folding line forming the boundary between the first region and the second region, and a first through hole formed along the first folding line into which the claw portions are inserted, the first region has a front A second fold line is provided parallel to the second side, a first slit is provided along the second fold line and extends to the second side, a second slit is provided along the second fold line and extends to the first fold line, and a third slit is provided along the second slit and extends along the first fold line, and the second region has three third fold lines provided parallel to the second side, and the claw portion protruding from the opposite side of the second side, A first diagonal support plate is connected to the rectangular tubular body via the first fold line, and the second diagonal support plate is connected to the first diagonal support plate via the second fold line. The sheet is folded along the second fold line so that the first and second diagonal support plates form an X shape, and the sheet is sequentially folded along the first and third fold lines to assemble the rectangular tubular body. With this form of cushioning material, the rectangular tubular body that constitutes the outer edge of the cushioning material is formed in a single layer, and the rectangular tubular body has a first diagonal support plate and a second diagonal support plate that extend along the diagonals inside the rectangular tubular body, so that the material area of ​​the cushioning material can be reduced while suppressing a decrease in the strength of the cushioning material.

[0007] (2) In the cushioning material described in (1) above, the first diagonal support plate and the second diagonal support plate each have projections formed at their free ends, and a second through hole is formed on the third bending line at a position corresponding to the projection, and the projection may be inserted into the second through hole. With this form of cushioning material, the position of the free end can not be shifted during assembly, so it can be assembled easily.

[0008] (3) In the cushioning material described in (1) above, the free end of the first diagonal support plate may narrow in width towards the free end, and the base end of the first diagonal support plate may widen in width towards the base end. With this form of cushioning material, the length of the narrow portion of the first and second diagonal support plates can be shortened. As a result, bending of the first and second diagonal support plates during assembly can be suppressed, making assembly easier.

[0009] (4) In the cushioning material described in (2) above, the free end of the first diagonal support plate may narrow in width towards the free end, and the base end of the first diagonal support plate may widen in width towards the base end. With this form of cushioning material, the length of the narrow portion of the first and second diagonal support plates can be shortened. As a result, bending of the first and second diagonal support plates during assembly can be suppressed, making assembly easier.

[0010] (5) The cushioning material described in any one of the above items (1) to (4) may include one first diagonal support plate and one second diagonal support plate. This form of cushioning material can suppress the complexity of the structure of the cushioning material and can also be made smaller.

[0011] (6) The cushioning material described in any one of the above items (1) to (4) comprises two or more first diagonal support plates and one or more second diagonal support plates, wherein the first diagonal support plates and the second diagonal support plates are formed alternately. This form of cushioning material can suppress a decrease in the strength of the cushioning material.

[0012] (7) In the cushioning material described in (6) above, the first through hole may be a pair of notches divided by the third slit. With this form of cushioning material, since the first through hole is composed of a pair of notches divided by the third slit, the structure can be simplified while suppressing a decrease in the fixing function.

[0013] Furthermore, this disclosure can be implemented in various forms, for example, as a blank sheet assembled into cushioning material, a method for manufacturing cushioning material, and packaging material containing cushioning material. [Brief explanation of the drawing]

[0014] [Figure 1] This is a perspective view showing the schematic configuration of a cushioning material as one embodiment of the present disclosure. [Figure 2] This is a plan view showing an example of the schematic configuration of the seat before assembly. [Figure 3] This is an explanatory diagram showing how the cushioning material is assembled. [Figure 4] This is an explanatory diagram showing how the cushioning material is assembled. [Figure 5] This is an explanatory diagram showing how the cushioning material is assembled. [Figure 6] This is an explanatory diagram showing how the cushioning material is assembled. [Figure 7] This is a perspective view showing the schematic configuration of the cushioning material of the second embodiment. [Figure 8] This is a plan view showing the schematic configuration of the sheet before assembly in the second embodiment. [Figure 9] This is an explanatory diagram showing the schematic configuration of the cushioning material of the third embodiment. [Figure 10]It is a plan view showing a schematic configuration of a sheet before assembly in the third embodiment. [Figure 11] It is a perspective view showing a schematic configuration of a cushioning material in the fourth embodiment. [Figure 12] It is a plan view showing a schematic configuration of a sheet before assembly in the fourth embodiment. [Figure 13] It is a perspective view showing an example of a schematic configuration of a cushioning material of Modification 1. [Figure 14] It is an explanatory view showing a schematic configuration of a cushioning material of Modification 2. [Figure 15] It is a plan view showing an example of a schematic configuration of a sheet before assembly in Modification 2.

Modes for Carrying Out the Invention

[0015] A. First Embodiment: <Configuration> FIG. 1 is a perspective view showing a schematic configuration of a cushioning material 100 as an embodiment of the present disclosure. The cushioning material 100 is assembled by folding a single sheet 10. The sheet 10 corresponds to a so-called blank sheet. The material of the sheet 10 is not particularly limited, and examples include any thin plate material such as cardboard or plastic cardboard. The cushioning material 100 is mainly used to fill gaps when packing products, parts, etc. to be packed in boxes such as cardboard or cartons.

[0016] The cushioning material 100 comprises a rectangular tube portion 20, a first diagonal support plate 30, a second diagonal support plate 40, and a claw portion 50. The rectangular tube portion 20 is formed in the shape of a roughly rectangular prism frame and constitutes the outer edge of the cushioning material 100. The rectangular tube portion 20 is formed in a single layer. In other words, none of the four faces of the rectangular tube portion 20 have two or more sheets of the material 10 overlapping. The first diagonal support plate 30 and the second diagonal support plate 40 extend along the diagonals inside the rectangular tube portion 20. The first diagonal support plate 30 and the second diagonal support plate 40 are formed alternately. The cushioning material 100 of this embodiment comprises two first diagonal support plates 30 and one second diagonal support plate 40. A detailed description of the first diagonal support plate 30 and the second diagonal support plate 40 will be given later. The claw portion 50 maintains its shape after assembly. More specifically, the claw portion 50 is inserted into the first through hole 71, which will be described later, to lock the folded sheet 10.

[0017] Figure 2 is a plan view showing an example of the schematic configuration of sheet 10 before assembly. In its pre-assembly state, sheet 10 has a roughly rectangular external shape with a first side 11 and a second side 12 that are substantially perpendicular to each other. In Figure 2, the first side 11 is the side that extends in the horizontal direction of the paper, and the second side 12 is the side that extends in the vertical direction of the paper. In the example shown in Figure 2, the first side 11 is longer than the second side 12. The dimensions and thickness of sheet 10 are set appropriately according to the size and shape of the cushioning material 100, etc.

[0018] The sheet 10 has a first region 15 and a second region 16. The first region 15 is formed in a substantially rectangular shape with a length equal to the diagonal of the rectangular cylindrical portion 20 among the first sides 11. The first region 15 forms the first diagonal support plate 30 and the second diagonal support plate 40. The second region 16 is formed in a substantially rectangular shape adjacent to the first region 15. The second region 16 forms the rectangular cylindrical portion 20. A first fold line 61 is formed at the boundary between the first region 15 and the second region 16. The first fold line 61 is formed parallel to the second side 12. The first diagonal support plate 30 is connected to the rectangular cylindrical portion 20 via the first fold line 61. A first through hole 71 into which the claw portion 50 is inserted is formed on the first fold line 61. Therefore, the first through-hole 71 is formed along the first fold line 61. In this disclosure, "fold line" means a fold line that does not penetrate the thickness of the sheet 10, and is composed of a creasing line or lead creasing line. A creasing line is a fold line created by flattening a step at the target location so that a sheet such as corrugated cardboard can be folded neatly when assembled into a three-dimensional shape such as a box. A lead creasing line is made by alternately making creasing and cuts to make it easier to fold. In this disclosure, "through-hole" means a hole or notch that penetrates the thickness of the sheet 10.

[0019] The first region 15 has a second fold line 62, a first slit 81, a second slit 82, and a third slit 83 formed therein. In this disclosure, "slit" means a cutting line that cuts the sheet 10.

[0020] The second fold line 62 is provided parallel to the second side 12 at the intersection of the diagonals of the rectangular tube portion 20 within the first region 15. In other words, the second fold line 62 is formed at approximately half the length of the first side 11 within the first region 15. In the example shown in Figure 2, the second fold line 62 is formed in two locations. The second diagonal support plate 40 is connected to the first diagonal support plate 30 via the second fold line 62.

[0021] The first slit 81 is connected to one end of the second fold line 62, and the second slit 82 is connected to the other end of the second fold line 62. The first slit 81 is connected to the second fold line 62 and extends to the second side 12. The first slit 81 separates the free end 32 side of the first diagonal support plate 30 from the one end 42 side of the second diagonal support plate 40. The second slit 82 is connected to the second fold line 62 and extends to the first fold line 61. The second slit 82 separates the other end 33 side of the first diagonal support plate 30 from the other end 43 side of the second diagonal support plate 40. In this embodiment, both the first slit 81 and the second slit 82 are formed parallel to the first side 11. In the example shown in Figure 2, two first slits 81 and two second slits 82 are formed. The third slit 83 is connected to the second slits 82 and is formed along the first bending line 61. The third slit 83 separates the other end 43 of the second diagonal support plate 40 from the second region 16. Both the one end 42 and the other end 43 of the second diagonal support plate 40 are free ends. The number of third slits 83 is equal to the number of second diagonal support plates 40 provided in the cushioning material 100. In the example shown in Figure 2, one third slit 83 is formed.

[0022] In this embodiment, the width of one end 32, which is the free end of the first diagonal support plate 30, is smaller than the width of the other end 33, which is the base end of the first diagonal support plate 30. Also, the width of one end 42 of the second diagonal support plate 40, defined by adjacent first slits 81, is larger than the width of the other end 43 of the second diagonal support plate 40, defined by adjacent second slits 82. Here, the widths of the first diagonal support plate 30 and the second diagonal support plate 40 correspond to the length along the direction parallel to the second side 12. From the viewpoint of suppressing a decrease in strength, it is preferable that the width of one end 42 of the second diagonal support plate 40 be larger than the width of the other end 33 of the first diagonal support plate 30, but it may also be smaller. Also, from the viewpoint of suppressing a decrease in strength, it is preferable that the width of the other end 43 of the second diagonal support plate 40 be larger than the width of one end 32 of the first diagonal support plate 30, but it may also be smaller.

[0023] The second region 16 has three third fold lines 63 and a claw portion 50. The three third fold lines 63 are provided parallel to the second side 12. The spacing between the three third fold lines 63 is set according to the shape of the cushioning material 100. The claw portion 50 is formed protruding from the opposite side 13 of the second side 12. In this embodiment, the claw portion 50 is provided at a position corresponding to the second diagonal support plate 40 in the direction along the second side 12. A fourth fold line 64 for folding up the claw portion 50 is formed at the base end of the claw portion 50. In this embodiment, the width of the claw portion 50, that is, the dimension of the claw portion 50 in the direction parallel to the second side 12, is greater than the width of the other end 43 of the second diagonal support plate 40. The width of the first through hole 71 along the first fold line 61 is set according to the width of the claw portion 50. In this embodiment, the first through-hole 71 is a pair of notches divided by the third slit 83.

[0024] In this embodiment, the first diagonal support plate 30 and the second diagonal support plate 40 each have projections 90 formed at their free ends. In other words, the projections 90 are formed at one end 32 of the first diagonal support plate 30 and at one end 42 and the other end 43 of the second diagonal support plate 40. In this embodiment, the projections 90 are formed at approximately the center in the width direction at the free ends of the first diagonal support plate 30 and the second diagonal support plate 40. In addition, in this embodiment, second through holes 72 are formed on the third fold line 63 at positions corresponding to the projections 90. The number of second through holes 72 is equal to the number of projections 90. The length of the second through holes 72 along the third fold line 63 is set according to the dimensions of the projections 90 along the direction parallel to the second side 12. The projections 90 are inserted into the second through holes 72 during assembly.

[0025] <Assembly Instructions> Figures 3 to 6 are explanatory diagrams showing the assembly process of the cushioning material 100. Figures 3 to 6 show, in this order, how the sheet 10 is assembled into the cushioning material 100.

[0026] As shown in Figure 3, the sheet 10 is folded along the second fold line 62, so that the first diagonal support plate 30 and the second diagonal support plate 40 form an X shape. Then, the sheet 10 is folded along the first fold line 61, and the projection 90 formed on one end 42 of the second diagonal support plate 40 is inserted into the second through hole 72 formed on the third fold line 63. The second fold line 62 may be a forward fold or a reverse fold, but it is preferable to fold it forward from the viewpoint of simplifying the pressing process when forming the fold lines 61, 62, and 63 by applying pressure to only one side of the sheet 10, and from the viewpoint of ease of assembly.

[0027] As shown in Figures 4-6, the sheet 10 is sequentially folded along the third folding line 63 to assemble the rectangular tube portion 20. As shown in Figures 4 and 5, the projections 90 formed on one end 32 of the first diagonal support plate 30 and the projections 90 formed on the other end 43 of the second diagonal support plate 40 are sequentially inserted into the second through-holes 72 formed on the third folding line 63. As shown in Figure 6, the sheet 10 is folded along the fourth folding line 64, and the claw portion 50 is inserted into the first through-hole 71. This completes the cushioning material 100 shown in Figure 1.

[0028] As described above, the cushioning material 100 of this embodiment has a single rectangular tube portion 20 that forms the outer edge of the cushioning material 100, thus simplifying the structure and reducing the material area of ​​the cushioning material 100 (area of ​​the sheet 10). Furthermore, since the rectangular tube portion 20 has a first diagonal support plate 30 and a second diagonal support plate 40 that extend along the diagonals, it can be given strength to withstand external pressure. Therefore, it is possible to reduce the material area of ​​the cushioning material 100 while suppressing a decrease in the strength of the cushioning material 100. In particular, since both the first diagonal support plate 30 and the second diagonal support plate 40 are formed to extend along the entire length of the diagonal, deformation (loss of shape) due to external pressure can be suppressed compared to configurations that have support plates divided along the diagonal, or configurations in which the support plates do not extend along the diagonal, unlike the present invention.

[0029] Furthermore, since the assembly is performed by folding a single sheet 10 formed by connecting the first region 15 and the second region 16 via the first folding line 61, the complexity of the assembly process can be suppressed, and assembly can be performed easily. Also, since the assembly is performed by folding a single sheet 10, the number of parts can be reduced compared to a configuration that combines multiple parts, as opposed to the present invention, and as a result, the increase in the cost required for managing parts can be suppressed. Also, compared to a configuration that combines multiple parts, as opposed to the present invention, it is possible to suppress assembly in the wrong orientation and to suppress misalignment of parts after assembly. In addition, since the material used is a sheet 10 having a substantially rectangular external shape, it is possible to suppress a decrease in the efficiency of material usage when cutting out the sheet 10.

[0030] Furthermore, since the projections 90 formed on the free ends of the first diagonal support plate 30 and the second diagonal support plate 40 are inserted into the second through hole 72 during assembly, misalignment of the free ends can be suppressed. As a result, assembly can be easily performed. In addition, since the claw portion 50 can maintain the shape of the cushioning material 100 after assembly, the complexity of the assembly process can be suppressed compared to configurations that use tape or adhesive to fix the cushioning material, unlike the present invention.

[0031] Furthermore, since the first diagonal support plate 30 and the second diagonal support plate 40 are formed alternately, a decrease in the strength of the cushioning material 100 can be suppressed. Also, since the first through hole 71 is formed by a pair of notches divided by the third slit 83, the structure can be simplified while suppressing a decrease in the fixing function. In addition, compared to an embodiment in which the first diagonal support plate 30 is formed in a position that does not overlap with the third slit 83, the connection length between the first diagonal support plate 30 and the rectangular cylindrical body portion 20 can be secured, suppressing a decrease in strength, and a decrease in symmetry can also be suppressed.

[0032] B. Second Embodiment: Figure 7 is a perspective view showing the schematic configuration of the cushioning material 100a of the second embodiment. Figure 8 is a plan view showing the schematic configuration of the sheet 10a before assembly in the second embodiment. The cushioning material 100a of the second embodiment differs from the cushioning material 100 of the first embodiment in that it comprises one first diagonal support plate 30a and one second diagonal support plate 40a. The other configurations are substantially the same as those of the first embodiment, so the same reference numerals are used for the same components, and their detailed descriptions are omitted.

[0033] As shown in Figure 8, in the sheet 10a of the second embodiment, one second fold line 62 is formed, and one first slit 81 and one second slit 82 are formed connected to it. In the example shown in Figure 8, the width of one end 32 of the first diagonal support plate 30a is smaller than the width of the other end 33, and the width of one end 42 of the second diagonal support plate 40a is larger than the width of the other end 43. Also, the width of one end 32 of the first diagonal support plate 30a is smaller than the width of one end 42 of the second diagonal support plate 40a, and the width of the other end 33 of the first diagonal support plate 30a is larger than the width of the other end 43 of the second diagonal support plate 40a. Furthermore, the width of one end 32 of the first diagonal support plate 30a and the width of the other end 43 of the second diagonal support plate 40a are formed to be approximately the same, and the width of the other end 33 of the first diagonal support plate 30a and the width of one end 42 of the second diagonal support plate 40a are formed to be approximately the same.

[0034] In this embodiment, the claw portion 50a is provided in a position corresponding to the first diagonal support plate 30a in the direction along the second side 12. The width of the claw portion 50a is formed to be smaller than the width of the other end 33, which is the base end of the first diagonal support plate 30a. The first through hole 71a is formed approximately in the center of the other end 33 in the width direction of the first diagonal support plate 30a. In addition, the projection 90a in this embodiment is formed at the width direction end of the free ends of the first diagonal support plate 30a and the second diagonal support plate 40a. In addition, the second through hole 72a in this embodiment is a notch formed at the end of the third bending line 63.

[0035] The cushioning material 100a of the second embodiment is assembled in the same manner as the cushioning material 100 of the first embodiment. That is, the sheet 10a is folded along the second folding line 62 so that the first diagonal support plate 30a and the second diagonal support plate 40a form an X shape. Then, while the projection 90a is inserted into the second through hole 72a, the sheet 10a is sequentially folded along the first folding line 61 and the third folding line 63 to assemble the rectangular tube portion 20.

[0036] The cushioning material 100a of the second embodiment described above provides the same effects as the cushioning material 100 of the first embodiment. In addition, since it is equipped with one first diagonal support plate 30a and one second diagonal support plate 40a, the complexity of the structure of the cushioning material 100a can be suppressed, and the cushioning material 100a can be made smaller.

[0037] C. Third Embodiment: Figure 9 is an explanatory diagram showing the schematic configuration of the cushioning material 100b of the third embodiment. For convenience, Figure 9 shows the cushioning material 100b in the process of assembly. Figure 10 is a plan view showing the schematic configuration of the sheet 10b before assembly in the third embodiment. The cushioning material 100b of the third embodiment differs from the cushioning material 100a of the second embodiment in the formation direction of the first slit 81b and the second slit 82b. The other configurations are substantially the same as those of the second embodiment, so the same components are denoted by the same reference numerals, and their detailed descriptions are omitted.

[0038] As shown in Figure 10, the first slit 81b and the second slit 82b are formed in a direction intersecting the direction along the first side 11 in the pre-assembly state. In this embodiment, the first slit 81b and the second slit 82b are formed substantially parallel to each other, but they do not have to be substantially parallel. The free end 32 of the first diagonal support plate 30b narrows in width toward the free end side, i.e., the end 32 side. The base end 33 of the first diagonal support plate 30b widens in width toward the base end side, i.e., the other end 33 side. As a result, the one end 42 of the second diagonal support plate 40b widens in width toward the end 42 side, and the other end 43 of the second diagonal support plate 40b narrows in width toward the other end 43 side. With this configuration, the length of the narrow portion can be shortened in the first diagonal support plate 30b and the second diagonal support plate 40b.

[0039] The cushioning material 100b of the third embodiment described above provides the same effects as the cushioning material 100a of the second embodiment. In addition, one end 32 of the first diagonal support plate 30b narrows in width towards the end 32, and the other end 33 of the first diagonal support plate 30b widens in width towards the other end 33, so the length of the narrow portion of the first diagonal support plate 30b and the second diagonal support plate 40b can be shortened. As a result, bending of the first diagonal support plate 30b and the second diagonal support plate 40b during assembly can be suppressed, making assembly easier.

[0040] D. Fourth Embodiment: Figure 11 is a perspective view showing the schematic configuration of the cushioning material 100c of the fourth embodiment. The cushioning material 100c of the fourth embodiment differs from the cushioning material 100 of the first embodiment in that it comprises two connected rectangular tubular sections 20c. The other configurations are substantially the same as those of the first embodiment, so the same reference numerals are used for the same components, and their detailed descriptions are omitted.

[0041] As shown in Figure 11, the two rectangular tube sections 20c are connected to each other at any one side of the rectangular tube section 20c. The angle of the connecting portion of the two rectangular tube sections 20c can be freely changed by adjusting the degree of bending. In this embodiment, two first diagonal support plates 30 and one second diagonal support plate 40 are provided inside each rectangular tube section 20c.

[0042] Figure 12 is a plan view showing the schematic configuration of the sheet 10c before assembly in the fourth embodiment. The sheet 10c has two first regions 15c and two second regions 16c formed thereon. The two first regions 15c and the two second regions 16c are each formed side by side along the first edge 11. The two first regions 15c are separated from each other by a fourth slit 84c formed in the direction along the first edge 11. The two second regions 16c are connected via a fifth fold line 65c formed in the direction along the first edge 11 and separated from each other by a fifth slit 85c formed in the direction along the first edge 11. In this embodiment, the fifth fold line 65c is formed connected to two adjacent parallel third fold lines 63. The fifth fold line 65c may be formed in connection with the first fold line 61 and the adjacent third fold line 63, or it may be formed in connection with the opposite side 13 on which the claw portion 50 is formed and the adjacent third fold line 63.

[0043] The cushioning material 100c of the fourth embodiment described above provides the same effects as the cushioning material 100 of the first embodiment. In addition, since it comprises two rectangular cylindrical body portions 20c connected to each other at any one side of the rectangular cylindrical body portion 20c, the packaged item can be protected from two directions. For example, the cushioning material 100c may be used to fill gaps in the corners from two directions when packaging an item in a box.

[0044] E. Variations: Figure 13 is a perspective view showing an example of the schematic configuration of the cushioning material 100d of Modification 1. In the cushioning material 100d of Modification 1, four first diagonal support plates 30 and three second diagonal support plates 40 are provided inside the rectangular cylindrical body portion 20. Thus, the number of first diagonal support plates 30 and the number of second diagonal support plates 40 provided inside the rectangular cylindrical body portion 20 can be any number. In other words, generally, the cushioning material 100d comprises two or more first diagonal support plates 30 and one or more second diagonal support plates 40, and the first diagonal support plates 30 and the second diagonal support plates 40 may be formed in an alternating pattern. With such a configuration, a decrease in the strength of the cushioning material can be suppressed. For this reason, even in the case of cushioning material 100d with a relatively large dimension along the second side 12, for example, a decrease in strength can be effectively suppressed.

[0045] Figure 14 is an explanatory diagram showing the schematic configuration of the cushioning material 100e of Modification 2. For convenience, Figure 14 shows the cushioning material 100e in the process of assembly. Figure 15 is a plan view showing an example of the schematic configuration of the sheet 10e before assembly in Modification 2. The cushioning material 100e of Modification 2 comprises two first diagonal support plates 30e and one second diagonal support plate 40e, similar to the cushioning material 100 of the first embodiment. Also, similar to the cushioning material 100b of the third embodiment, the cushioning material 100e has a first slit 81e and a second slit 82e formed along a direction intersecting the direction along the first side 11. With this configuration, one end 32 of the first diagonal support plate 30e narrows in width towards the end 32 side, and the other end 33 of the first diagonal support plate 30e widens in width towards the other end 33 side. This configuration also provides the same effects as the cushioning material 100 of the first embodiment and the cushioning material 100b of the third embodiment.

[0046] Furthermore, the configuration of the cushioning materials 100, 100a to e in the above embodiments and modifications is merely an example and can be modified in various ways. For example, at least a portion of the protrusions 90, 90a and the second through holes 72, 72a may be omitted. Also, for example, the width of one end 32 of the first diagonal support plates 30, 30a, b, e may be greater than the width of the other end 33 of the first diagonal support plates 30, 30a, b, e, and the width of one end 42 of the second diagonal support plates 40, 40a, b, e may be smaller than the width of the other end 43 of the second diagonal support plates 40, 40a, b, e. Also, for example, the first through holes 71, 71a may be formed in positions that do not overlap with the third slit 83. Also, for example, depending on the shape of the item to be packaged, recesses may be formed in some corners of the rectangular tubular body portions 20, 20c.

[0047] This disclosure is not limited to the embodiments described above, and can be implemented in various configurations without departing from its spirit. For example, the technical features in each embodiment corresponding to the technical features in each form described in the summary of the invention can be replaced or combined as appropriate in order to solve some or all of the above-described problems, or to achieve some or all of the above-described effects. Furthermore, if a technical feature is not described as essential in this specification, it can be deleted as appropriate. [Explanation of symbols]

[0048] 10, 10a~e…sheet, 11…first side, 12…second side, 13…opposite side, 15, 15c…first region, 16, 16c…second region, 20, 20c…rectangular tube section, 30, 30a, b, e…first diagonal support plate, 32…one end, 33…other end, 40, 40a, b, e…second diagonal support plate, 42…one end, 43…other end, 50, 50a…claw section, 61…first fold line, 62…second fold 63... Third fold line, 64... Fourth fold line, 65c... Fifth fold line, 71, 71a... First through hole, 72, 72a... Second through hole, 81, 81b, 81e... First slit, 82, 82b, 82e... Second slit, 83... Third slit, 84c... Fourth slit, 85c... Fifth slit, 90, 90a... Protrusion, 100, 100a~e... Cushioning material

Claims

1. It is a cushioning material that can be assembled by folding a single sheet. The outer edge of the cushioning material consists of a single rectangular tube portion, A first diagonal support plate and a second diagonal support plate are provided, extending along the diagonals inside the rectangular tube portion. A claw portion for maintaining the shape after assembly, Equipped with, The sheet, in its pre-assembly state, is substantially rectangular in shape, having a first side and a second side that are substantially perpendicular to each other. The aforementioned sheet includes: A first region having the length of the diagonal of the first side, and where the first diagonal support plate and the second diagonal support plate are formed, A substantially rectangular second region, which is connected to the first region and forms the rectangular tubular body portion, A first fold line forming the boundary between the first region and the second region, A first through hole formed along the first bending line into which the claw portion is inserted, A structure has been formed, The first region is, A second fold line is provided parallel to the second side at the position where the diagonals intersect within the first region, A first slit that is connected to the second fold line and extends to the second side, A second slit that is connected to the second fold line and extends to the first fold line, A third slit connected to the second slit and along the first bending line, A structure has been formed, The second region described above includes: Three third fold lines provided parallel to the second side, The claw portion protruding from the opposite side of the second side, A structure has been formed, The first diagonal support plate is connected to the rectangular tubular body via the first bending line, The second diagonal support plate is connected to the first diagonal support plate via the second bending line, It comprises two or more of the first diagonal support plates and one or more of the second diagonal support plates, The first diagonal support plate and the second diagonal support plate are formed in an alternating pattern. The first through hole is a pair of notches divided by the third slit, The sheet is folded along the second folding line so that the first diagonal support plate and the second diagonal support plate form an X shape. The sheet is folded sequentially along the first and third folding lines to assemble the rectangular tubular body. Buffer material.

2. In the cushioning material according to claim 1, The first diagonal support plate and the second diagonal support plate each have a projection formed at their free end. A second through-hole is formed on the third bending line at a position corresponding to the projection. The projection is inserted into the second through hole. Buffer material.

3. In the cushioning material according to claim 1, The first diagonal support plate is narrower in width from the position where the second fold line is formed toward the free end, and wider in width from the position where the second fold line is formed toward the base end. Buffer material.

4. In the cushioning material according to claim 2, The first diagonal support plate is narrower in width from the position where the second fold line is formed toward the free end, and wider in width from the position where the second fold line is formed toward the base end. Buffer material.

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