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An evacuated panel is provided for thermal insulation of a body (3, 4) having non-planar surfaces, the panel having two main faces and comprising a flexible envelope (1), made of one or more barrier sheets, and a filling material formed of at least two boards (2; 2') of an open cell polymeric foam,

An evacuated panel is provided for thermal insulation of a body (3, 4) having non-planar surfaces, the panel having two main faces and comprising a flexible envelope (1), made of one or more barrier sheets, and a filling material formed of at least two boards (2; 2') of an open cell polymeric foam, the boards lying one over the other, and each board having a thickness between about 2 and 8 mm.

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I claim: 1. An evacuated panel for thermal insulation of a body having non-planar surfaces, the panel having two main faces and consisting of: a flexible envelope comprising at least one barrier sheet; and a filling material inside the envelope, the filling material formed of at least two boards of

I claim: 1. An evacuated panel for thermal insulation of a body having non-planar surfaces, the panel having two main faces and consisting of: a flexible envelope comprising at least one barrier sheet; and a filling material inside the envelope, the filling material formed of at least two boards of an open cell polymeric foam, the boards lying one over another in such a manner that the boards are free to slide over one another at least in a direction parallel to curvature of the boards when the panel is bent, each board having a thickness between about 2 and 8 mm. 2. The evacuated panel according to claim 1, wherein the boards are made of a polyurethane foam, and each board has a thickness of about 4 to 6 mm. 3. The evacuated panel according to claim 1, wherein the boards are substantially equal to each other. 4. The evacuated panel according to claim 1, wherein at least one of the boards, at least one of which is next to the envelope, has at least one cutout therein, the cutout having a shape and size coincident with a shape and size of a relief provided on one of the non-planar surfaces of the body. 5. The evacuated panel according to claim 1, wherein more than one of the boards has at least one cutout therein, and the boards having the at least one cutout are adjacent to each other. 6. The evacuated panel according to claim 1, wherein the envelope is made of at least one multi-layer sheet. 7. The evacuated panel according to claim 1, wherein the boards have sufficient flexibility to allow curving of the evacuated panel with the boards sliding on each other to conform the panel to a non-planar surface. 8. The evacuated panel according to claim 1, wherein the boards have a substantially uniform thickness. 9. The evacuated panel according to claim 1, wherein the boards are substantially flat sheets of polymeric foam. 10. An evacuated panel for thermal insulation of a body having non-planar surfaces, the panel having two main faces and consisting of: a flexible envelope comprising at least one barrier sheet; a filling material inside the envelope, the filling material formed of at least two boards of an open cell polymeric foam, the boards lying one over another in such a manner that the boards are free to slide over one another at least in a direction parallel to curvature of the boards when the panel is bent; and plastic sheets inserted between pairs of adjacent boards to favor reciprocal sliding of the boards relative to each other. 11. The evacuated panel according to claim 10, wherein the boards are made of a polyurethane foam, and each board has a thickness of about 4 to 6 mm. 12. The evacuated panel according to claim 10, wherein the boards are substantially equal to each other. 13. The evacuated panel according to claim 10, wherein at least one of the boards, at least one of which is next to the envelope, has at least one cutout therein, the cutout having a shape and size coincident with a shape and size of a relief provided on one of the non-planar surfaces of the body. 14. The evacuated panel according to claim 13, wherein more than one of the boards has at least one cutout therein, and the boards having the at least one cutout are adjacent to each other. 15. The evacuated panel according to claim 10, wherein the envelope is made of at least one multi-layer sheet. 16. The evacuated panel according to claim 10, wherein the boards have sufficient flexibility to allow curving of the evacuated panel with the boards sliding on each other to conform the panel to a non-planar surface. 17. The evacuated panel according to claim 10, wherein the boards have a substantially uniform thickness. 18. The evacuated panel according to claim 10, wherein the boards are substantially flat sheets of polymeric foam. 19. An evacuated panel for thermal insulation of a body having non-planar surfaces, the panel having two main faces and consisting of; a flexible envelope comprising at least one barrier sheet; a filling material inside the envelope, the filling material formed of at least two boards of an open cell polymeric foam, the boards lying one over another in such a manner that the boards are free to slide over one another at least in a direction parallel to curvature of the boards when the panel is bent; and a getter material contained in the envelope. 20. The evacuated panel according to claim 19, wherein the boards are made of a polyurethane foam, and each board has a thickness of about 4 to 6 mm. 21. The evacuated panel according to claim 19, wherein the boards are substantially equal to each other. 22. The evacuated panel according to claim 19, wherein at least one of the boards, at least one of which is next to the envelope, has at least one cutout therein, the cutout having a shape and size coincident with a shape and size of a relief provided on one of the non-planar surfaces of the body. 23. The evacuated panel according to claim 22, wherein more than one of the boards has at least one cutout therein, and the boards having the at least one cutout are adjacent to each other. 24. The evacuated panel according to claim 19, wherein the envelope is made of at least one multi-layer sheet. 25. The evacuated panel according to claim 19, wherein the boards have sufficient flexibility to allow curving of the evacuated panel with the boards sliding on each other to conform the panel to a non-planar surface. 26. The evacuated panel according to claim 19, wherein the boards have a substantially uniform thickness. 27. The evacuated panel according to claim 19, wherein the boards are substantially flat sheets of polymeric foam. 28. The evacuated panel according to claim 19, wherein the getter material comprises at least one chemical moisture sorber and at least one compound selected from the group consisting of a transition metal oxide and an alloy based on barium and lithium. 29. An evacuated panel for thermal insulation of a body having non-planar surfaces, the panel having two main faces and consisting of: a flexible envelope comprising at least one barrier sheet; a filling material inside the envelope, the filling material formed of at least two boards of an open cell polymeric foam, the boards lying one over another in such a manner that the boards are free to slide over one another at least in a direction parallel to curvature of the boards when the panel is bent; plastic sheets inserted between pairs of adjacent boards to favor reciprocal sliding of the boards relative to each other; and a getter material contained in the envelope. 30. The evacuated panel according to claim 29, wherein the boards are made of a polyurethane foam, and each board has a thickness of about 4 to 6 mm. 31. The evacuated panel according to claim 29, wherein the boards are substantially equal to each other. 32. The evacuated panel according to claim 29, wherein at least one of the boards, at least one of which is next to the envelope, has at least one cutout therein, the cutout having a shape and size coincident with a shape and size of a relief provided on one of the non-planar surfaces of the body. 33. The evacuated panel according to claim 32, wherein more than one of the boards has at least one cutout therein, and the boards having the at least one cutout are adjacent to each other. 34. The evacuated panel according to claim 29, wherein the envelope is made of at least one multi-layer sheet. 35. The evacuated panel according to claim 29, wherein the boards have sufficient flexibility to allow curving of the evacuated panel with the boards sliding on each other to conform the panel to a non-planar surface. 36. The evacuated panel according to claim 29, wherein the boards have a substantially uniform thickness. 37. The evacuated panel according to claim 29, wherein the boards are substantially flat sheets of polymeric foam. 38. The evacuated panel according to claim 29, wherein the getter material comprises at least one chemical moisture sorber and at least one compound selected from the group consisting of a transition metal oxide and an alloy based on barium and lithium. 39. An evacuated panel for thermal insulation of a body having non-planar surfaces, the panel having two main faces and comprising: a flexible envelope comprising at least one barrier sheet; a filling material inside the envelope, the filling material formed of at least two boards of an open cell polymeric foam, the boards lying one over another and being substantially flat sheets having sufficient flexibility to allow curving of the evacuated panel with the boards sliding directly on each other to conform the panel to a non-planar surface. 40. The evacuated panel according to claim 39, wherein the boards are made of a polyurethane foam, and each board has a thickness between about 2 and 8 mm. 41. The evacuated panel according to claim 39, wherein the boards are substantially equal to each other. 42. The evacuated panel according to claim 39, wherein at least one of the boards, at least one of which is next to the envelope, has at least one cutout therein, the cutout having a shape and size coincident with a shape and size of a relief provided on one of the non-planar surfaces of the body. 43. The evacuated panel according to claim 42, wherein more than one of the boards has at least one cutout therein, and the boards having the at least one cutout are adjacent to each other. 44. The evacuated panel according to claim 39, wherein the envelope is made of at least one multi-layer sheet. 45. The evacuated panel according to claim 39, wherein the boards have sufficient flexibility to allow curving of the evacuated panel with the boards sliding on each other to conform the panel to a non-planar surface. 46. The evacuated panel according to claim 39, wherein the boards have a substantially uniform thickness. 47. The evacuated panel according to claim 39, further comprising a getter material contained in the envelope. 48. The evacuated panel according to claim 47, wherein the getter material comprises at least one chemical moisture sorber and at least one compound selected from the group consisting of a transition metal oxide and an alloy based on barium and lithium.