Infrared-reflecting covering material
An invention describes a drapable IR-reflecting material for garments. The IR-reflecting material comprises a water-vapor-permeable metallized ply supporting an air-permeable drapable convective ply having a three-dimensionally transmissive structure. The outer surface of the convective ply, said outer surface being opposite to the metallized ply, is formed by an air-permeable sheetlike structure. The convective ply causes heat convection of temperatures reflected by the metallized ply in order that the outer surface of the convective ply may be brought into line with the ambient temperature.
1. A garment having an outer side and an inner side, said garment comprising:
an infrared-reflecting material comprising a metalized porous fluoropolymer membrane having therein open pore walls, said metalized porous fluoropolymer membrane having a top surface and a bottom surface, and
an air permeable, drapable and convective ply having a three-dimensionally transmissive structure, said convective ply comprising spacers disposed substantially vertically within said convective ply with respect to at least one of the top surface and the bottom surface of the metalized porous fluoropolymer membrane,
wherein the convective ply is disposed on the top surface of the metalized porous fluoropolymer membrane, and
wherein said spacers provide air exchange with the environment such that air flows through said convective ply in x, y, and z directions, said air exchange causing said outer side of said garment to be substantially equal to ambient temperature,
wherein said metalized porous fluoropolymer membrane has a discontinuous metalized surface.
2. The garment according to claim 1 wherein the convective ply has a top surface with an air-permeable sheet structure disposed thereon, said air-permeable sheet structure being a constituent part of said convective ply and forming the top surface of said convective ply.
3. The garment according to claim 2 wherein the sheet structure has an air permeability of not less than 50 l/m 2 s at a pressure of 10 Pa.
4. The garment according to claim 1 wherein the convective ply is not less than 2 mm in thickness.
5. The garment according to claim 1 wherein the convective ply has a structure that is ribbed, honeycombed, pimpled, a net, deflocked, or foamed.
6. The garment according to claim 1 wherein the convective ply is a three-dimensional pimpled formed-loop knit.
7. The garment according to claim 1 wherein the convective ply is selected from the group consisting of polypropylene, polyester, polyurethane, polyethylene, polyamide and combinations thereof.
8. The garment according to claim 1 wherein the convective ply has an air permeability in the z direction of not less than 100 l/m 2 s at a pressure of 10 Pa.
9. The garment according to claim 1 wherein the convective ply has an air permeability in the x and y directions of not less than 50 l/m 2 s at a pressure of 10 Pa.
10. The garment according to claim 1 , wherein said spacers form defined gaps above at least one of said top surface and said bottom surface of said metalized porous fluoropolymer membrane.
11. The garment according to claim 1 , wherein said spacers are elastically compressible.
12. A garment having an outer side and an inner side, said garment comprising:
at least one infrared-reflecting material comprising a metalized water-vapor-permeable expanded polytetrafluoroethylene membrane having a top surface and a bottom surface, and
at least one air permeable, drapable and convective ply having a three-dimensionally transmissive structure,
wherein the convective ply is disposed on at least one of said top surface and said bottom surface of said metalized ply, and
wherein the convective ply is a three-dimensional pimpled formed-loop knit, and
wherein said metalized expanded polytetrafluoroethylene membrane has a discontinuous metalized surface.
13. The garment of claim 12 , wherein the convective ply is formed of a material selected from the group consisting of polypropylene, polyester, polyurethane, polyethylene, polyamide and combinations thereof.
14. The garment of claim 12 , wherein the convective ply has a top surface with an air-permeable sheet structure disposed thereon, said air-permeable sheet structure being a constituent part of said convective ply and forming the top surface of said convective ply.
15. The garment of claim 14 , wherein the sheet structure has an air permeability of not less than 50 l/m 2 s at a pressure of 10 Pa.
16. The garment of claim 12 , wherein said convective ply has an air permeability in x and y directions of not less than 50 l/m 2 s at a pressure of 10 Pa.
17. The garment of claim 12 , wherein said convective ply has a thickness from 2 mm to 20 mm.