Cushioning material

Abstract

To improve cushioning performance by a cushioning material per material usage and per installation space.SOLUTION: The cushioning material 1 is a cushioning material including a first surface part 11 in which a first surface is a flat surface and a hole is formed, a first cushioning part 12 having a first cylindrical part 14 extending from an outer peripheral edge of the first surface part 11 to the other side of the first surface part 11, and a second cushioning part 13 provided inside the first cylindrical part 14 of the first cushioning part 12 and having a second cylindrical part 16 extending from an inner peripheral edge of the first surface part 11 to the other side of the first surface part 11.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cushioning material, particularly to a cushioning material for packaging. [Background technology]

[0002] Conventionally, cushioning materials formed into a desired shape by a pulp molding method have been widely used as cushioning materials for packaging. The cushioning materials formed by the pulp molding method are placed between a packing case and an object to be packed, and absorb impacts on the object when the packing case containing the object is dropped, for example. A cushioning material formed by the pulp molding method is disclosed in Patent Document 1, for example.

[0003] The conventional cushioning material for packaging disclosed in Patent Document 1 is integrally molded using pulp molding and has multiple protrusions for sandwiching the packaged item during packaging. The tips of these protrusions are curved into a hemispherical shape, and an opening is formed on one side cut vertically. A cushioning material with this configuration can provide the desired cushioning effect in response to a single impact load. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-219144 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the conventional cushioning material for packaging disclosed in Patent Document 1 has a problem in that the protrusions are easily deformed by impact, and the size of the protrusions must be large to provide a cushioning effect against large impact loads.

[0006] The present invention has been made in view of the above points, and has as its object to improve the cushioning performance of a cushioning material per amount of material used and per installation space. [Means for solving the problem]

[0007] A cushioning material according to one aspect of the present invention comprises a first surface portion having a flat first surface and holes formed therein, a first cushioning portion having a first cylindrical portion extending from the outer peripheral edge of the first surface portion to the other side of the first surface portion, and a second cushioning portion located inside the first cylindrical portion of the first cushioning portion and having a second cylindrical portion extending from the inner peripheral edge of the first surface portion to the other side of the first surface portion. [Effects of the Invention]

[0008] According to the present invention, by using a double structure consisting of a first buffer section and a second buffer section provided inside the first buffer section, it is possible to improve the buffering performance of the buffer material per amount of material used and per installation space. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1(a) is a perspective view of a cushioning material according to a first embodiment of the present invention, and FIG. 1(b) is a perspective view of the cushioning material as seen from a different direction from that shown in FIG. [Figure 2] FIG. 2 is a plan view of the cushioning material of FIG. [Figure 3] 3 is a cross-sectional view of the cushioning material of FIG. 2 taken along line AA. [Figure 4] 4 is a perspective view of a state in which an object to be packed is packed in a packing case member in which the cushioning material of FIGS. 1 to 3 is attached to a case body. FIG. [Figure 5] 5(a) is a perspective view of one of the packing case members in FIG. 4, and (b) is a perspective view of the one of the packing case members as seen from a different direction from (a). FIG. [Figure 6] FIG. 5 is a right side view of one of the packing case members of FIG. 4. [Figure 7] 5 is a development view of a case body constituting one of the packing case members of FIG. 4. FIG. [Figure 8] 10A to 10C are diagrams illustrating an example of a procedure for a worker to fix a cushioning material to a case body. [Figure 9]8 is a cross-sectional view of the cushioning material and the case body in a state where the cushioning material of FIGS. 1 to 3 is fixed to the case body of FIG. 7. FIG. [Figure 10] 10 is a cross-sectional view of a cushioning material taken along a plane including a perpendicular line passing through the center of a first surface portion of a second embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] First Embodiment A cushioning material 1 according to a first embodiment of the present invention will be described below with reference to the drawings.

[0011] First, a cushioning material 1 according to a first embodiment of the present invention will be described with reference to Fig. 1 to Fig. 3. Fig. 1(a) is a perspective view of the cushioning material 1 according to the first embodiment of the present invention, and Fig. 1(b) is a perspective view of the cushioning material 1 as seen from a different direction than Fig. 1(a). Fig. 2 is a plan view of the cushioning material 1 in Fig. 1. Fig. 3 is a cross-sectional view of the cushioning material 1 along line AA in Fig. 2.

[0012] The cushioning material 1 is formed by a pulp molding method using a mold from a pulp mold material. The cushioning material 1 includes a first surface portion 11, a first buffer portion 12, and a second buffer portion 13.

[0013] The first surface portion 11 has a flat first surface and has a shape with a hole formed therein. In the first embodiment, the first surface portion 11 has an annular shape with a circular hole formed in the center.

[0014] The first buffer portion 12 has a cylindrical first tubular portion 14 that extends from the outer peripheral edge of the first surface portion 11 to the other side of the first surface portion 11, and a flange portion 15 that extends parallel to the first surface of the first surface portion 11 and outward from the end of the first tubular portion 14 opposite the first surface portion 11 side. In the first embodiment, the first tubular portion 14 is cylindrical, and the flange portion 15 is annular. The surface of the flange portion 15 opposite the first surface portion 11 side is a flat surface that is parallel to the first surface of the first surface portion 11.

[0015] The dimension of the first buffer portion 12 in the direction of the perpendicular p1 to the first surface of the first surface portion 11 is h1. The first thickness of the first cylindrical portion 14 (the distance between the outer wall surface and the inner wall surface of the first cylindrical portion 14 in the direction of the perpendicular to the outer wall surface and the inner wall surface of the first cylindrical portion 14) is constant t1. The first cylindrical portion 14 is inclined at a first angle α1 with respect to the perpendicular p1 to the first surface of the first surface portion 11 so that the diameter of the first cylindrical portion 14 increases with increasing distance from the first surface portion 11. The first angle α1 is the draft angle when the buffer material 1 is removed from the mold toward the other side of the first surface portion 11 to form the first cylindrical portion 14. The first angle α1 is, for example, 5 degrees. The diameter of the first cylindrical portion 14 at the point farthest from the first surface portion 11 (the maximum diameter of the first cylindrical portion 14) is r1.

[0016] The second buffer section 13 is provided inside the first cylindrical section 14 of the first buffer section 12, and has a cylindrical second cylindrical section 16 extending from the inner peripheral edge of the first surface section 11 to the other side of the first surface section 11, and a second surface section 17 extending inwardly and parallel to the first surface of the first surface section 11 from the end of the second cylindrical section 16 opposite the first surface section 11 side. In the first embodiment, the second cylindrical section 16 is cylindrical, and the second surface section 17 is circular. The surface of the second surface section 17 opposite the first surface section 11 side is a flat surface parallel to the first surface of the first surface section 11.

[0017] The dimension of the second buffer portion 13 in the direction of the perpendicular p1 to the first surface of the first surface portion 11 is h2. The second thickness of the second cylindrical portion 14 (the distance between the outer wall surface and the inner wall surface of the second cylindrical portion 16 in the direction of the perpendicular to the outer wall surface and the inner wall surface of the second cylindrical portion 16) is constant at t2. The second cylindrical portion 16 is inclined at a second angle α2 with respect to the perpendicular p1 to the first surface of the first surface portion 11 so that the diameter of the second cylindrical portion 16 increases as it approaches the first surface portion 11. The second angle α2 is the draft angle when the buffer material 1 is removed from the mold toward one side of the first surface portion 11 to form the second cylindrical portion 16. The second angle α2 is, for example, 5 degrees.

[0018] In the first embodiment, the dimension h1 of the first surface of the first surface 11 of the first buffering section 12 in the direction of the perpendicular p1 is the same as the dimension h2 of the first surface of the first surface 11 of the second buffering section 13 in the direction of the perpendicular p1 (h1 = h2). In other words, the end of the first buffering section 12 opposite the first surface 11 side (the surface of the flange 15 of the first buffering section 12 opposite the first surface 11 side) and the end of the second buffering section 13 opposite the first surface 11 side (the surface of the second surface 17 of the second buffering section 13 opposite the first surface 11 side) are on the same plane parallel to the first surface of the first surface 11. By setting these dimensions, an impact load is applied to the first buffering section 12 and the second buffering section 13 simultaneously.

[0019] The first thickness t1 of the first cylindrical portion 14 and the second thickness t2 of the second cylindrical portion 16 are the same (t1=t2).

[0020] The first angle α1 of the first cylindrical portion 14 and the second angle α2 of the second cylindrical portion 16 are the same (α1=α2).

[0021] Fig. 4 is a perspective view of a state in which an object 4 is packed in packing case members 2 and 3 in which the cushioning material 1 shown in Figs. 1 to 3 is attached to case bodies 2A and 3A. Fig. 5(a) is a perspective view of one packing case member 2 in Fig. 4, and Fig. 5(b) is a perspective view of one packing case member 2 seen from a different direction than Fig. 5(a). Fig. 6 is a right side view of one packing case member 2 in Fig. 4.

[0022] The packing case member 2 includes a case body 2A made of corrugated cardboard and a cushioning material 1 formed by a pulp molding method using a mold from a pulp mold-based material and attached to the case body 2A. The packing case member 3 includes a case body 3A made of corrugated cardboard and a cushioning material 1 formed by a pulp molding method using a mold from a pulp mold-based material and attached to the case body 3A. As shown in Fig. 4, the packing case member 2 with the cushioning material 1 attached to the case body 2A and the packing case member 3 with the cushioning material 1 attached to the case body 3A sandwich the packaged item 4, such as a multifunction printer, from the left and right to pack the packaged item 4.

[0023] 5(a), (b) and 6, in the packing case member 2, the cushioning material 1 is attached to the case main body 2A so that the first surface portion 11 of the cushioning material 1 is located on the side that contacts the packaged item 4. In the packing case member 3, the cushioning material 1 is attached to the case main body 3A so that the first surface portion 11 of the cushioning material 1 is located on the side that contacts the packaged item 4.

[0024] In the packing case members 2 and 3, the cushioning material 1 may be attached to the case main bodies 2A and 3A so that the flange 15 side of the cushioning material 1 is positioned on the packaged article 4 side.

[0025] Next, the case body 2A to which the cushioning material 1 and the like shown in Figures 1 to 3 are attached will be described with reference to Figure 7. Figure 7 is a development view of the case body 2A constituting one of the packing case members 2 in Figure 4.

[0026] The case body 2A included in the packing case member 2 is formed from a corrugated cardboard sheet and is assembled by folding the corrugated cardboard sheet. The case body 2A has a main body portion 20A and cushioning material fixing portions 100, 200, 300, 400, etc., formed on the main body portion 20A and used to fix the cushioning material 1. The basic structure for fixing the cushioning material 1 to the case body 2A by the cushioning material fixing portions 100, 200, 300, 400, etc. is similar, so in the first embodiment, only the cushioning material fixing portion 100 will be described. The case body 3A included in the packing case member 3 has a case body and a cushioning material fixing portion formed on the main body portion and used to fix the cushioning material 1, and the basic structure for fixing the cushioning material 1 to the case body 3A by the cushioning material fixing portions is similar to that of the cushioning material fixing portion 100, etc., included in the case body 2A.

[0027] Cushioning material fixing part 100 penetrates main body part 20A and has cushioning material mounting holes 101A, 101B having dimensions corresponding to the dimension r1 of the maximum diameter of first tubular part 14 of cushioning material 1, into which cushioning material 1 is inserted from the first surface part 11 side until the surface of flange part 15 on the first surface part 11 side reaches main body part 20A. Cushioning material fixing part 100 has protrusions 102A, 102B that protrude from the edges of cushioning material mounting holes 101A, 101B inward of cushioning material mounting holes 101A, 101B.

[0028] The cushioning material mounting holes 101A, 101B are circular in plan view, and the diameter of the cushioning material mounting holes 101A, 101B is larger than the maximum dimension r1 of the outer diameter of the first tubular portion 14 of the cushioning material 1 and smaller than the outer diameter of the flange portion 15.

[0029] There are four protrusions 102A, 102B, and the diameter of the circle connecting the tips of the four protrusions 102A, 102B is larger than the outer diameter of the annular first surface portion 11 of the cushioning material 1 and smaller than the maximum dimension r1 of the outer diameter of the first tubular portion 14 of the cushioning material 1.

[0030] By setting the buffer mounting holes 101A, 101B and the protrusions 102A, 102B to the above dimensions, when the buffer 1 is inserted into the buffer mounting holes 101A, 101B from the first surface 11 side of the buffer 1, the first cylindrical portion 14 of the first buffering portion 12 of the buffer 1 first gets caught on the four protrusions 102A, 102B, and when the buffer 1 is further inserted into the buffer mounting holes 101A, 101B, the flange 15 of the buffer 1 gets caught on the main body portion 20A around the buffer mounting holes 101A, 101B. The four protrusions 102A, 102B serve to prevent the buffer 1 from coming out.

[0031] The cushioning material fixing part 100 has a portion (folding line FL) of its periphery connected to the main body part 20A, and the rest of the portion (folding line FL) is cut off from the main body part 20A, and has a covering main body part 104 that, when folded at the portion (folding line FL), covers at least a portion of the surface opposite to the first surface part 11 of the flange part 15 of the cushioning material 1 inserted into the cushioning material mounting holes 101A, 101B, and a covering part 103 having fitting parts 105, 106 extending from the covering main body part 104 in the outward direction of the covering main body part 104. The fitting parts 105, 106 become wider the further away from the covering main body part 104.

[0032] The cushioning material fixing part 100 penetrates the main body part 20A and has mating holes 107, 108 into which mating parts 105, 106 of the cover part 104 are fitted. The mating parts 105, 106 are fitted into the mating holes 107, 108 in a state where they are bent at the boundaries between the cover main body part 104 and the mating parts 105, 106.

[0033] An example of a procedure for a worker to fix the cushioning material 1 to the case body 2A will be described with reference to Fig. 8. Fig. 8 is a diagram showing an example of a procedure for a worker to fix the cushioning material 1 to the case body 2A.

[0034] Fig. 8(a) is an enlarged view of the area surrounded by dotted line a in case main body 2A in Fig. 7. With case main body 2A in the state shown in Fig. 8(a), an operator inserts cushioning material 1 from the first surface 11 side of cushioning material 1 into cushioning material attachment holes 101A, 101B formed in main body portion 20A until first cylindrical portion 104 of first cushioning portion 102 contacts protrusions 102A, 102B and then the surface of flange portion 15 of cushioning material 1 on the first surface 11 side is caught on main body portion 20A, thereby attaching cushioning material 1 to cushioning material attachment holes 101A, 101B formed in main body portion 20A. Fig. 8(b) shows the state in which cushioning material 1 is attached to cushioning material attachment holes 101A, 101B formed in main body portion 20A.

[0035] 8(b) is attached to the cushioning material attachment holes 101A, 101B formed in the main body portion 20A, the worker folds the covering main body portion 104 of the covering portion 103 along the folding line FL to cover at least a part of the surface of the flange portion 15 of the cushioning material 1 inserted into the cushioning material attachment holes 101A, 101B opposite to the first surface portion 11 side with the covering main body portion 104. The state in which this covering main body portion 104 is attached to at least a part of the surface of the flange portion 15 of the cushioning material 1 opposite to the first surface portion 11 side is shown in FIG.

[0036] With the cover body 104 shown in FIG. 8(c) covering at least a portion of the surface opposite the first surface 11 of the flange 15 of the cushioning material 1, the worker bends the fitting portions 105, 106 of the cover 103 at the boundary between the cover body 104 and the fitting portions 105, 106 to fit into the fitting holes 107, 108. This causes the cover 103 to maintain its bent state. FIG. 8(d) shows the state in which the fitting portions 105, 106 are fitted into the fitting holes 107, 108. FIG. 9 shows a cross-sectional view of the state shown in FIG. 8(d).

[0037] The cushioning material fixing part 100 having a simple structure can prevent the cushioning material 1 from slipping out of the cushioning material mounting hole 101.

[0038] According to the first embodiment, the cushioning material 1 has a double structure consisting of a first cushioning section 12 and a second cushioning section 13 provided inside the first cushioning section 12, thereby improving the cushioning performance of the cushioning material per amount of material used and per installation space. This allows the cushioning material 1 that can provide a cushioning effect in response to a desired impact load to be made smaller, reducing the cost of materials such as the cushioning material 1, and also reducing the overall size of the cushioning material 1, packing case members 2 and 3, and packaged item 4 when packaged, thereby achieving a reduction in transportation costs.

[0039] In addition, the dimension h1 in the direction of the perpendicular p1 of the first surface of the first surface 11 of the first buffer section 12 and the dimension h2 in the direction of the perpendicular p1 of the first surface 11 of the second buffer section 13 are made the same (h1 = h2), that is, the plane on which the end of the first buffer section 12 opposite the first surface 11 side is located (the surface on the opposite side to the first surface 11 side of the flange section 15 of the first buffer section 12) and the plane on which the end of the second buffer section 13 opposite the first surface 11 side is located (the surface on the opposite side to the first surface 11 side of the second surface 17 of the second buffer section 13) are made to be on the same plane parallel to the first surface of the first surface 11. By doing this, the impact load begins to be applied to the first buffer section 12 and the second buffer section 13 simultaneously, making the first buffer section 12 and the second buffer section 13 less likely to collapse, and a small-sized buffer section 1 can exhibit sufficient impact resistance to withstand a large impact load.

[0040] The diameter of the second cylindrical portion 16 of the second buffer portion 13 can be adjusted according to the mass of the packaged item 4 and impact resistance performance while maintaining the outer size of the buffer material 1.

[0041] Second Embodiment A cushioning material 1A according to a second embodiment of the present invention will be described below with reference to the drawings. In the cushioning material 1 according to the first embodiment, the dimension h1 in the direction of the perpendicular p1 to the first surface of the first surface 11 of the first cushioning section 12 is the same as the dimension h2 in the direction of the perpendicular p1 to the first surface of the first surface 11 of the second cushioning section 13 (h1 = h2). In contrast, the cushioning material 1A according to the second embodiment differs in that the dimension h2A in the direction of the perpendicular p1 to the first surface of the first surface 11 of the second cushioning section 13A is smaller than the dimension h1A in the direction of the perpendicular p1 to the first surface of the first surface 11 of the first cushioning section 12A (h1A > h2A). Note that in the second embodiment, components similar to those of the first embodiment are designated by the same reference numerals, and descriptions of these similar components will be omitted.

[0042] The structure of cushioning material 1A according to a second embodiment of the present invention will be described below with reference to Fig. 10. Fig. 10 is a cross-sectional view of cushioning material 1A according to the second embodiment of the present invention. Note that Fig. 10 is a cross-sectional view of cushioning material 1A taken along a plane including a perpendicular line p1 passing through the center of first surface portion 11.

[0043] The cushioning material 1A is formed using a mold from a pulp mold material by a pulp molding method, and includes a first surface portion 11, a first cushioning portion 12A, and a second cushioning portion 13A.

[0044] The first buffer portion 12A has a cylindrical first cylindrical portion 14A extending from the outer peripheral edge of the first surface portion 11 to the other side of the first surface portion 11, and a flange portion 15A extending parallel to the first surface of the first surface portion 11 and outward from the end of the first cylindrical portion 14A opposite the first surface portion 11 side. In the second embodiment, the first cylindrical portion 14A is cylindrical, and the flange portion 15A is annular. The surface of the flange portion 15A opposite the first surface portion 11 side is a flat surface parallel to the first surface of the first surface portion 11.

[0045] The dimension of the first buffer portion 12A in the direction of the perpendicular p1 to the first surface of the first surface 11 is h1A. The first thickness of the first cylindrical portion 14A (the distance between the outer wall surface and the inner wall surface of the first cylindrical portion 14A in the direction of the perpendicular to the outer wall surface and the inner wall surface of the first cylindrical portion 14A) is constant t1A. The first cylindrical portion 14A is inclined at a first angle α1A with respect to the perpendicular p1 to the first surface of the first surface 11 so that the diameter of the first cylindrical portion 14A increases with increasing distance from the first surface 11. The first angle α1A is the draft angle when the buffer material 1A is removed from the mold toward the other side of the first surface 11 to form the first cylindrical portion 14. The first angle α1A is, for example, 5 degrees. The diameter of the first cylindrical portion 14A at the point farthest from the first surface 11 (the maximum diameter of the first cylindrical portion 14) is r1A.

[0046] The second buffer section 13A is located inside the first cylindrical section 14A of the first buffer section 12A and has a cylindrical second cylindrical section 16A extending from the inner peripheral edge of the first surface section 11 to the other side of the first surface section 11, and a second surface section 17A extending inwardly and parallel to the first surface of the first surface section 11 from the end of the second cylindrical section 16A opposite the first surface section 11 side. In the second embodiment, the second cylindrical section 16A is cylindrical and the second surface section 17A is circular. The surface of the second surface section 17A opposite the first surface section 11 side is a flat surface parallel to the first surface of the first surface section 11.

[0047] The dimension in the direction of the perpendicular line p1 to the first surface of the first surface portion 11 of the second buffer portion 13A is h2A. Also, the second thickness of the second cylindrical portion 14A (the distance between the outer wall surface and the inner wall surface in the direction perpendicular to the outer wall surface and the inner wall surface of the second cylindrical portion 16A) is a constant t2A. Further, the second cylindrical portion 16A is inclined at a second angle α2A with respect to the perpendicular line p1 to the first surface of the first surface portion 11, such that the diameter of the second cylindrical portion 16A increases as it approaches the first surface portion 11. The second angle α2A is the drawing gradient when the buffer material 1A is drawn from the mold toward the first surface portion 11 to form the second cylindrical portion 16A. The second angle α2A is, for example, 5 degrees.

[0048] In the second embodiment, the dimension h2A in the direction of the perpendicular line p1 to the first surface of the first surface portion 11 of the second buffer portion 13A is smaller than the dimension h1A in the direction of the perpendicular line p1 to the first surface of the first surface portion 11 of the first buffer portion 12A (h2A < h1A). That is, the end portion on the side opposite to the first surface portion 11 side of the first buffer portion 12A (the surface on the side opposite to the first surface portion 11 side of the flange portion 15A of the first buffer portion 12A) and the end portion on the side opposite to the first surface portion 11 side of the second buffer portion 13A (the surface on the side opposite to the first surface portion 11 side of the second surface portion 17A of the second buffer portion 13A) are on different planes parallel to the first surface of the first surface portion 11, and the plane on which the end portion on the side opposite to the first surface portion 11 side of the second buffer portion 13A is located (the surface on the side opposite to the first surface portion 11 side of the second surface portion 17A of the second buffer portion 13A) is closer to the first surface portion 11 side than the plane on which the end portion on the side opposite to the first surface portion 11 side of the first buffer portion 12 is located (the surface on the side opposite to the first surface portion 11 side of the flange portion 15 of the first buffer portion 12). By setting the dimensions in this way, an impact load is applied to the first buffer portion 12A, and then an impact load is applied to the second buffer portion 13A.

[0049] The first thickness t1A of the first cylindrical portion 14A and the second thickness t2A of the second cylindrical portion 16A are the same (t1A = t2A).

[0050] The first angle α1A of the first cylindrical portion 14A and the second angle α2A of the second cylindrical portion 16A are the same (α1A = α2A).

[0051] According to the above-described second embodiment, the dimension h2A in the direction of the perpendicular line p1 to the first surface of the first surface portion 11 of the second buffer portion 13A is made smaller than the dimension h1A in the direction of the perpendicular line p1 to the first surface of the first surface portion 11 of the first buffer portion 12A (h2A < h1A). That is, the plane where the end portion on the side opposite to the first surface portion 11 side of the second buffer portion 13A is located (the surface on the side opposite to the first surface portion 11 side of the second surface portion 17A of the second buffer portion 13A) is closer to the first surface portion 11 side than the plane where the end portion on the side opposite to the first surface portion 11 side of the first buffer portion 12A is located (the surface on the side opposite to the first surface portion 11 side of the flange portion 15A of the first buffer portion 12A). By doing so, an impact load is applied to the first buffer portion 12A in a state where it has not been crushed first, and the first buffer portion absorbing the impact by being crushed. Then, as the crushing of the first buffer portion 12A increases, an impact load is applied to the second buffer portion 13A in a state where it has not been crushed, and the second buffer portion 13A absorbs the impact by being crushed. In this way, by first absorbing the impact with the first buffer portion 12A and then absorbing the impact with the second buffer portion 13A, it is possible to exhibit a sufficient buffering effect corresponding to a large impact load while suppressing the magnitude of the impact load applied to the packaged object with the buffer material 1A having a small size in the direction of the perpendicular line p1 to the first surface of the first surface portion 11 and the like.

[0052] The size of the diameter of the second cylindrical portion 16 of the second buffer portion 13 and the dimension h2A in the direction of the perpendicular line p1 to the first surface of the first surface portion 11 of the second buffer portion 13A enable adjustment according to the mass of the packaged object 4 and the anti-impact performance while maintaining the outer size of the buffer material 1A.

[0053] ≪First Modification Example of the First and Second Embodiments≫ In the first embodiment described above, the first angle α1 of the first upper cylindrical portion 14 of the first buffering section 12 and the second angle α2 of the second cylindrical portion 16 of the second buffering section 13 are the same (α1 = α2). However, in a first modification of the first embodiment, the first angle α1 and the second angle α2 are different (α1 ≠ α2). When the first angle α1 and the second angle α2 are different (α1 ≠ α2), the first angle α1 may be larger than the second angle α2 (α1 > α2), or the second angle α2 may be larger than the first angle α1 (α2 > α1). The smaller the first and second angles α1 and α2, the less likely the first and second cylindrical portions 14 and 16 of the first and second buffering sections 12 and 13 are to collapse under impact loads. This allows for the preparation of a greater number of buffering materials 1 capable of exhibiting buffering effects at different impact loads.

[0054] In the second embodiment described above, the first angle α1A of the first upper cylindrical portion 14A of the first buffer section 12A and the second angle α2A of the second cylindrical portion 16A of the second buffer section 13A are the same (α1A = α2A), but in the first modified example of the second embodiment, the first angle α1A and the second angle α2A are different (α1 ≠ α2). When the first angle α1A and the second angle α2A are different (α1A ≠ α2A), the first angle α1A may be larger than the second angle α2A (α1A > α2A), or the second angle α2A may be larger than the first angle α1A (α2A > α1A). The smaller the first and second angles α1A, α2A, the less the first and second cylindrical portions 14A, 16A of the first and second buffer portions 12A, 13A are able to collapse under impact loads, allowing for fine adjustment of the impact cushioning provided by the first and second buffer portions 12A, 13A.

[0055] For example, when the first angle α1A is made larger than the second angle α2A (α1A > α2A), the first cylindrical portion 14A of the first buffer portion 12A is more likely to collapse with respect to the impact load than the second cylindrical portion 16A of the second buffer portion 13A. Therefore, since the first cylindrical portion 14A of the first buffer portion 12A that first receives the impact load is likely to collapse, the first cylindrical portion 14A of the first buffer portion 12A attenuates the impact load with a small attenuation amount while preventing the impact load from being applied too much to the object to be packaged. The second cylindrical portion 16A of the second buffer portion 13A that receives the impact load later is difficult to collapse, so the impact load can be attenuated with a large attenuation amount and the impact load can be received with a small deformation in the direction of the perpendicular line p1 of the first surface of the first surface portion 11.

[0056] <<Second Modified Example of the First and Second Embodiments>> In the above first embodiment, it is assumed that the first thickness t1 of the first cylindrical upper portion 14 of the first buffer portion 12 is the same as the second thickness t2 of the second cylindrical portion 16 of the second buffer portion 13 (t1 = t2). However, in the second modified example of the first embodiment, the first thickness t1 and the second thickness t2 are different (t1 ≠ t2). When the first thickness t1 and the second thickness t2 are different (t1 ≠ t2), the first thickness t1 may be made smaller than the second thickness t2 (t1 < t2), or the second thickness t2 may be made smaller than the first thickness t1 (t2 < t1). The larger the first and second thicknesses t1 and t2 are, the more difficult it is for the first and second cylindrical portions 14 and 16 of the first and second buffer portions 12 and 13 to collapse with respect to the impact load. Therefore, more buffer materials 1 with different impact loads capable of exhibiting a buffer effect can be prepared.

[0057] In the above-described second embodiment, it is assumed that the first thickness t1A of the first upper cylinder portion 14A of the first buffer portion 12A is the same as the second thickness t2A of the second cylindrical portion 16A of the second buffer portion 13A (t1A = t2A). However, in the second modification of the second embodiment, the first thickness t1A and the second thickness t2A are made different (t1A ≠ t2A). When the first thickness t1A and the second thickness t2A are different (t1A ≠ t2A), the first thickness t1A may be made smaller than the second thickness t2A (t1A < t2A), or the second thickness t2A may be made smaller than the first thickness t1A (t2A < t1A). The larger the first and second thicknesses t1A and t2A are, the less likely the first and second cylindrical portions 14A and 16A of the first and second buffer portions 12A and 13A are to collapse under an impact load. Therefore, the impact buffering by the first and second buffer portions 12A and 13A can be finely adjusted.

[0058] For example, when the first thickness t1A is made smaller than the second thickness t2A (t1A < t2A), the first cylindrical portion 14A of the first buffer portion 12A is more likely to collapse under an impact load than the second cylindrical portion 16A of the second buffer portion 13A. For this reason, since the first cylindrical portion 14A of the first buffer portion 12A, which receives the impact load first, is likely to collapse, the first cylindrical portion 14A of the first buffer portion 12A attenuates the impact load with a small attenuation amount while preventing the impact load from being applied too much to the packaged object, and the second cylindrical portion 16A of the second buffer portion 13A, which receives the impact load later, is less likely to collapse, so the impact load can be attenuated with a large attenuation amount and the impact load can be received with a small deformation in the direction of the perpendicular line p1 of the first surface of the first surface portion 11.

[0059] ≪Others≫ In the above-described first embodiment, it is assumed that the first angle α1 of the first cylindrical upper portion 14 of the first buffer portion 12 is the same as the second angle α2 of the second cylindrical portion 16 of the second buffer portion 13 (α1 = α2), and the first thickness t1 of the first cylindrical upper portion 14 of the first buffer portion 12 is the same as the second thickness t2 of the second cylindrical portion 16 of the second buffer portion 13 (t1 = t2). However, the first angle α1 and the second angle α2 may be different (α1 ≠ α2), and the first thickness t1 and the second thickness t2 may also be different (t1 ≠ t2). As combinations in this case, there are (1) α1 > α2 and t1 < t2, (2) α1 > α2 and t1 > t2, (3) α1 < α2 and t1 < t2, and (4) α1 < α2 and t1 > t2.

[0060] In the above-described second embodiment, it is assumed that the first angle α1A of the first cylindrical upper portion 14A of the first buffer portion 12A is the same as the second angle α2A of the second cylindrical portion 16A of the second buffer portion 13A (α1A = α2A), and the first thickness t1A of the first cylindrical upper portion 14A of the first buffer portion 12A is the same as the second thickness t2A of the second cylindrical portion 16A of the second buffer portion 13A (t1A = t2A). However, the first angle α1A and the second angle α2A may be different (α1A ≠ α2A), and the first thickness t1A and the second thickness t2A may also be different (t1A ≠ t2A). As combinations in this case, there are (1) α1A > α2A and t1A < t2A, (2) α1A > α2A and t1A > t2A, (3) α1A < α2A and t1A < t2A, and (4) α1A < α2A and t1A > t2A.

[0061] Note that the present invention is not limited to the configurations of the above-described embodiments, and various modifications are possible. Also, the configurations shown by the above-described first embodiment using FIGS. 1 to 9, the configurations shown by the above-described second embodiment using FIG. 10, and the configurations shown by the above-described modification examples are merely one embodiment of the present invention, and the present invention is not intended to be limited to such configurations.

Explanation of Reference Numerals

[0062] 1, 1A Buffer material 11 First surface portion 12, 12A First buffer portion 13, 13A Second buffer portion 14, 14A First cylindrical portion 15, 15A flange part 16, 16A second cylindrical part 17, 17A second face part

Claims

1. a first surface portion having a flat first surface and holes formed therein; a first buffer portion having a first cylindrical portion extending from an outer peripheral edge of the first surface portion to the other side of the first surface portion; a second buffer portion provided inside the first cylindrical portion of the first buffer portion and having a cylindrical second cylindrical portion extending from an inner peripheral edge of the first surface portion to the other side of the first surface portion; A cushioning material comprising:

2. a dimension of the first surface of the first buffer portion in the direction perpendicular to the first surface thereof is equal to a dimension of the first surface of the second buffer portion in the direction perpendicular to the first surface thereof; The cushioning material according to claim 1 .

3. the first cylindrical portion is inclined at a first angle with respect to a perpendicular line to the first surface of the first face portion so that the diameter of the first cylindrical portion increases with increasing distance from the first face portion, the second cylindrical portion is inclined at a second angle with respect to a perpendicular line to the first surface of the first face portion so that the diameter of the second cylindrical portion increases as the second cylindrical portion approaches the first face portion; The first angle and the second angle are the same. The cushioning material according to claim 2.

4. the first cylindrical portion is inclined at a first angle with respect to a perpendicular line to the first surface of the first face portion so that the diameter of the first cylindrical portion increases with increasing distance from the first face portion, the second cylindrical portion is inclined at a second angle with respect to a perpendicular line to the first surface of the first face portion so that the diameter of the second cylindrical portion increases as the second cylindrical portion approaches the first face portion; the first angle and the second angle are different; The cushioning material according to claim 2.

5. The cushioning material of claim 4 , wherein the first angle is greater than the second angle.

6. The cushioning material of claim 4 , wherein the second angle is smaller than the first angle.

7. The cushioning material according to claim 2 , wherein a first thickness of the first cylindrical portion and a second thickness of the second cylindrical portion are the same.

8. a first thickness of the first cylindrical portion and a second thickness of the second cylindrical portion are different from each other; The cushioning material according to any one of claims 2 to 6.

9. The cushioning material of claim 8 , wherein the second thickness is less than the first thickness.

10. The cushioning material of claim 8 , wherein the first thickness is less than the second thickness.

11. a length of the first surface of the second buffer portion in a direction perpendicular to the first surface is shorter than a length of the first surface of the first buffer portion in a direction perpendicular to the first surface; The cushioning material according to claim 1 .

12. the first cylindrical portion is inclined at a first angle with respect to a perpendicular line to the first surface of the first face portion so that the diameter of the first cylindrical portion increases with increasing distance from the first face portion, the second cylindrical portion is inclined at a second angle with respect to a perpendicular line to the first surface of the first face portion so that the diameter of the second cylindrical portion increases as the second cylindrical portion approaches the first face portion; The first angle and the second angle are the same. The cushioning material according to claim 11.

13. the first cylindrical portion is inclined at a first angle with respect to a perpendicular line to the first surface of the first face portion so that the diameter of the first cylindrical portion increases with increasing distance from the first face portion, the second cylindrical portion is inclined at a second angle with respect to a perpendicular line to the first surface of the first face portion so that the diameter of the second cylindrical portion increases as the second cylindrical portion approaches the first face portion; the first angle and the second angle are different; The cushioning material according to claim 11.

14. The cushioning material of claim 13 , wherein the first angle is greater than the second angle.

15. The cushioning material of claim 13 , wherein the second angle is less than the first angle.

16. The cushioning material according to claim 11 , wherein a first thickness of the first cylindrical portion and a second thickness of the second cylindrical portion are the same.

17. a first thickness of the first cylindrical portion and a second thickness of the second cylindrical portion are different from each other; The cushioning material according to any one of claims 11 to 15.

18. 18. The cushioning material of claim 17, wherein the second thickness is less than the first thickness.

19. 18. The cushioning material of claim 17, wherein the first thickness is less than the second thickness.

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