Multi=web plate of transparent plastics used in greenhouses etc.

摘要: The plate has elongated parallel hollow chambers (3) of rectangular cross-section separated from each other sideways by webs and defined top bottom upper (1) lower bands (2). (4) are spaced a distance d the form cohesive plastics plates with surface profiling formed on band or one inner designed in cylindrical Fresnel lens focal length f. extends along collects light. width f is to ten times between relevant band. provided area infra-red reflecting light strips except for strip b. b non-reflecting calculated following formula: >= a1-(d/f)