Lightweight, durable enclosures and laminates for making the same
View Patent ↗A lightweight enclosure is described that has an exterior film surface. The lightweight enclosure comprises a laminate having a porous outer film. The laminate is moisture vapor transmissive and flame resistance (passing CPAI-84), and abrasion resistance on the outer film surface thereby remaining durably liquidproof. The lightweight enclosure may be a single wall tent and is formed from a laminate having sufficient oxygen permeability to sustain life while enclosure openings are closed.
1. An air permeable, durably liquidproof laminate having an outer film surface, comprising
a liquidproof microporous fluoropolymer film that forms the outer film surface, wherein the microporous fluoropolymer film comprises an expanded fluoropolymer membrane, and
at least one additional layer comprising a porous film laminated to the liquidproof microporous fluoropolymer film on a side opposite the outer film surface with a discontinuous adhesive layer;
wherein the laminate has an O 2 permeation greater than 2 m 3 /(m 2 bar-hour), and is liquidproof at 0.7 psi for three minutes after 1000 abrasion cycles on the outer film surface.
2. The air permeable, liquidproof laminate of claim 1 wherein the laminate has a weight less than about 8 oz/yd 2 .
3. The air permeable, liquidproof laminate of claim 1 wherein the laminate has a weight less than about 6 oz/yd 2 .
4. The air permeable, liquidproof laminate of claim 1 , wherein the laminate is flame resistant.
5. The air permeable, liquidproof laminate of claim 1 wherein the porous film is a flame-resistant porous film.
6. The air permeable, liquidproof laminate of claim 1 wherein the porous film is a microporous fluoropolymer membrane.
7. The air permeable, liquidproof laminate of claim 1 , wherein the outer film surface is colorized.
8. The laminate of claim 1 , wherein the microporous fluoropolymer film comprises an expanded polytetrafluoroethylene membrane.
9. The laminate of claim 1 , wherein the discontinuous adhesive layer is flame resistant.
10. The laminate of claim 1 , wherein the microporous film comprises a carbon coating on the surface.
11. The laminate of claim 1 , wherein the laminate is flame resistant and passes CPAI-84.
12. The air permeable, liquidproof laminate of claim 1 wherein the porous film is the same as the liquidproof microporous fluoropolymer film.
13. The air permeable, liquidproof laminate of claim 1 wherein the porous film is different from the liquidproof microporous fluoropolymer film.