Porous structural body, porous structural body manufacturing method, and passenger-seat cushion member

1. A porous structural body made of flexible resin or rubber, the porous structural body comprising:

a skeleton part that defines a plurality of cell holes; and

a top skin part that is formed on at least part of an outer side of the skeleton part and integrated with the skeleton part to block at least some of the plurality of cell holes, at least part of an outer side of the top skin part being a surface,

wherein the top skin part includes a smooth part at which the surface is formed, and a through hole defined by the smooth part and penetrating through the top skin part, and

a ratio of total area of the surface relative to surface area of the top skin part is equal to or higher than 8%.

2. The porous structural body according to claim 1 , wherein

the porous structural body includes a top surface, a bottom surface, and a side surface, and

the surface of the top skin part is included in at least one of the top surface, the bottom surface, and the side surface.

3. The porous structural body according to claim 2 , wherein

the skeleton part includes

a plurality of bone parts, and

a plurality of connection parts connecting end parts of the plurality of bone parts,

the skeleton part includes a first cell defining part that defines a first cell hole inside,

the first cell defining part includes a plurality of first annular parts having annular shapes,

the plurality of first annular parts are coupled with each other so that first virtual surfaces defined by inner periphery side edge parts of the respective first annular parts do not intersect with each other,

the first cell hole is defined by the plurality of first annular parts and the plurality of first virtual surfaces defined by the plurality of respective first annular parts, and

each first annular part is constituted by a plurality of the bone parts and a plurality of the connection parts.

4. The porous structural body according to claim 2 , wherein the surface of the top skin part is continuously formed from the top surface to the side surface and/or from the bottom surface to the side surface.

5. The porous structural body according to claim 4 , wherein

the skeleton part includes

a plurality of bone parts, and

a plurality of connection parts connecting end parts of the plurality of bone parts,

the skeleton part includes a first cell defining part that defines a first cell hole inside,

the first cell defining part includes a plurality of first annular parts having annular shapes,

the plurality of first annular parts are coupled with each other so that first virtual surfaces defined by inner periphery side edge parts of the respective first annular parts do not intersect with each other,

the first cell hole is defined by the plurality of first annular parts and the plurality of first virtual surfaces defined by the plurality of respective first annular parts, and

each first annular part is constituted by a plurality of the bone parts and a plurality of the connection parts.

6. The porous structural body according to claim 1 , wherein

the skeleton part includes

a plurality of bone parts, and

a plurality of connection parts connecting end parts of the plurality of bone parts,

the skeleton part includes a first cell defining part that defines a first cell hole inside,

the first cell defining part includes a plurality of first annular parts having annular shapes,

the plurality of first annular parts are coupled with each other so that first virtual surfaces defined by inner periphery side edge parts of the respective first annular parts do not intersect with each other,

the first cell hole is defined by the plurality of first annular parts and the plurality of first virtual surfaces defined by the plurality of respective first annular parts, and

each first annular part is constituted by a plurality of the bone parts and a plurality of the connection parts.

7. The porous structural body according to claim 1 , wherein the porous structural body is shaped by using a 3D printer.

8. A passenger-seat cushion member comprising:

a seat body; and

the porous structural body according to claim 7 , filling a hole part formed at the seat body, at least part of the surface of the top skin part being bonded to the seat body.

9. A porous structural body manufacturing method of manufacturing the porous structural body according to claim 1 by using a 3D printer.

10. The porous structural body according to claim 1 , wherein

the top skin part has a plurality of the through holes, and

in surface view in a direction facing the surface of the top skin part, the plurality of the through holes each have a circular or oval opening shape at the surface on an outer side and are arrayed so that the surface of the top skin part is continuous in a lattice shape.

11. The porous structural body according to claim 10 , wherein

the skeleton part includes

a plurality of bone parts, and

a plurality of connection parts connecting end parts of the plurality of bone parts,

the skeleton part includes a first cell defining part that defines a first cell hole inside,

the first cell defining part includes a plurality of first annular parts having annular shapes,

the plurality of first annular parts are coupled with each other so that first virtual surfaces defined by inner periphery side edge parts of the respective first annular parts do not intersect with each other,

the first cell hole is defined by the plurality of first annular parts and the plurality of first virtual surfaces defined by the plurality of respective first annular parts, and

each first annular part is constituted by a plurality of the bone parts and a plurality of the connection parts.

12. A porous structural body made of flexible resin or rubber, the porous structural body comprising:

a skeleton part that defines a plurality of cell holes; and

a top skin part that is formed on at least part of an outer side of the skeleton part and integrated with the skeleton part to block at least some of the plurality of cell holes, at least part of an outer side of the top skin part being a surface,

wherein the skeleton part includes

a plurality of bone parts, and

a plurality of connection parts connecting end parts of the plurality of bone parts,

the skeleton part includes a first cell defining part that defines a first cell hole inside,

the first cell defining part includes a plurality of first annular parts having annular shapes,

the plurality of first annular parts are coupled with each other so that first virtual surfaces defined by inner periphery side edge parts of the respective first annular parts do not intersect with each other,

the first cell hole is defined by the plurality of first annular parts and the plurality of first virtual surfaces defined by the plurality of respective first annular parts, and

each first annular part is constituted by a plurality of the bone parts and a plurality of the connection parts.

13. The porous structural body according to claim 12 , wherein

the top skin part includes a smooth part at which the surface is formed, and a through hole defined by the smooth part and penetrating through the top skin part,

a ratio of total area of the surface relative to surface area of the top skin part is equal to or higher than 8%,

the top skin part has a plurality of the through holes, and

in surface view in a direction facing the surface of the top skin part, the plurality of the through holes each have a circular or oval opening shape at the surface on an outer side and are arrayed so that the surface of the top skin part is continuous in a lattice shape.

14. A porous structural body manufacturing method of manufacturing the porous structural body according to claim 12 by using a 3D printer.

15. The porous structural body according to claim 12 , wherein

the porous structural body includes a top surface, a bottom surface, and a side surface, and

the surface of the top skin part is included in at least one of the top surface, the bottom surface, and the side surface.

16. The porous structural body according to claim 15 , wherein

the top skin part includes a smooth part at which the surface is formed, and a through hole defined by the smooth part and penetrating through the top skin part, and

a ratio of total area of the surface relative to surface area of the top skin part is equal to or higher than 8%.

17. The porous structural body according to claim 15 , wherein the surface of the top skin part is continuously formed from the top surface to the side surface and/or from the bottom surface to the side surface.

18. The porous structural body according to claim 17 , wherein

the top skin part includes a smooth part at which the surface is formed, and a through hole defined by the smooth part and penetrating through the top skin part, and

a ratio of total area of the surface relative to surface area of the top skin part is equal to or higher than 8%.