| 摘要 |
A polymer sheet for use in agricultural structures, like greenhouses, tunnels and the like, which prevents fog formation on its surface, resulting in an essentially continuous water film upon water vapor deposition. The polymeric sheet can be one of polymeric ethylene-vinyl alcohol or of a copolymer of ethylene vinyl alcohol coextruded with a polyolefin. Multilayer sheets are very effective, such as ethylene vinyl alcohol/ethylene vinyl acetate/polyethylene three-layer sheet. Copolymers which do not impair the specific fog-formation preventing property of ethylene vinyl alcohol (EVOH) can be used. The invention also relates to agricultural structures which comprise such plastic sheets.
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