Porous body, additive manufacturing method for the body and apparatus for supporting and/or bearing a person
It is a feature of a porous body ( 10, 20 ) comprising a three-dimensional network of node points ( 200 ) joined to one another by struts ( 100 ), and a void volume ( 300 ) present between the struts ( 100 ), that the struts ( 100 ) have an average length of ≥200 to ≤50 mm, the struts ( 100 ) have an average thickness of ≥100 μm to ≤5 mm, and that the porous body has a compression hardness (40% compression, DIN EN ISO 3386-1: 2010-09) in at least one spatial direction of ≥10 to ≤100 kPa. The porous body according to the invention combines the advantages of a conventional mattress or cushion with ventilatability which results from its porous structure and is not achievable in conventional foams. The invention further relates to a method of producing such a porous body ( 10, 20 ) and to an apparatus comprising said body ( 10, 20 ) for supporting and/or bearing a person.
1. A porous body comprising a three-dimensional network of node points joined to one another by struts, and a void volume present between the struts, characterized in that
the struts have an average length of ≥200 μm to ≤50 mm,
the struts have an average thickness of ≥100 μm to ≤5 mm, and in that
the body has a compression hardness (40% compression, DIN EN ISO 3386-1: 2010-09) in at least one spatial direction of ≥10 to ≤100 kPa.
2. The porous body according to claim 1 , wherein the body has a compression set after 40% compression (DIN ISO 815-1) of ≤5%.
3. The porous body according to claim 1 , wherein the body has a tan δ value (20° C., DMA, DIN EN ISO 6721) in at least one spatial direction of 2:0.1 to:S 1.5 and/or the body has a maximum tan δ value (DMA, DIN EN ISO 6721) in at least one spatial direction at ≥−10° C. to ≥40° C.
4. The porous body according to claim 1 , wherein the compression hardness (40% compression, DIN EN ISO 3386-1:2010-09) of the body in a selected spatial direction differs by ≥10% from the compression hardness (40% compression, DIN EN ISO 3386-1:2010-09) of the body in a spatial direction at right angles to the spatial direction selected,
and/or
the tan δ value (20° C., DMA, DIN EN ISO 6721) of the body in a selected spatial direction differs by ≥10% from the tan δ value (20° C., DMA, DIN EN ISO 6721) of the body in a spatial direction at right angles to the spatial direction selected.
5. The porous body according to claim 1 , wherein the compression hardness (40% compression, DIN EN ISO 3386-1:2010-09) of the body in a selected spatial direction differs by <10% from the compression hardness (40% compression, DIN EN ISO 3386-1:2010-09) of the body in other spatial directions and/or the tan δ value (20° C., DMA, DIN EN ISO 6721) of the body in a selected spatial direction differs by <10% from the tan δ value (20° C., DMA, DIN EN ISO 6721) of the body in other spatial directions.
6. The porous body according to claim 1 , wherein the body is at least partly formed from a material having one or more of the following properties:
a tan δ value (20° C., DMA, DIN EN ISO 6721) of ≥0.1 to ≤1.5
a maximum tan δ value (DMA, DIN EN ISO 6721) of ≥−10° C. to ≤40° C.
a modulus of elasticity (DIN EN ISO 604:2003-12) of ≥1 MPa to ≤800 MPa
a Shore hardness (DIN ISO 7619-1:2012-02) of ≥40A to ≤70D
a melting point (DIN EN ISO 11357-3:2013-04) of ≤220° C.
a glass transition temperature T g (DMA, DIN EN ISO 6721) of ≤40° C.
7. The porous body according to claim 1 , wherein the void volume makes up ≥50% to ≤99% of the volume of the body.
8. The porous body according to claim 1 , wherein the node points are distributed in a periodically repeating manner in at least part of the volume of the body.
9. The porous body according to claim 1 , wherein the void volume is formed in the form of mutually penetrating first, second and third groups of channels, wherein a multitude of individual channels within each respective group of channels run parallel to one another and the first group of channels, the second group of channels and the third group of channels extend in different spatial directions.
10. The porous body according to claim 1 , wherein the average minimum angle between adjacent struts is ≥30° to ≤140°.
11. The porous body according to claim 1 , wherein the spatial density of the node points in a first region of the body is different from the spatial density of the node points in a second region of the body.
12. The porous body according to claim 1 , wherein the material of the body in a first region of the body is different from the material in a second region of the body.
13. A method of producing a porous body according to claim 1 , characterized in that the body is produced in an additive manufacturing method.
14. An apparatus for supporting and/or bearing a person, comprising a porous body according to claim 1 .
15. The apparatus according to claim 14 , further comprising a ventilator for passing air through at least a portion of the porous body.