Composite plastic film and greenhouse built therewith

Details Composite plastic film and greenhouse built therewith Composite plastic film and greenhouse built therewith

B - Operations, Transporting

32

B

B32B 27/08 (2006.01) A01G 9/14 (2006.01)

Patent

CA 2135812

- 22 - ABSTRACT OF THE DISCLOSURE Disclosed are a composite plastic film and a greenhouse constructed by using the same as a covering sheet spread over a framework capable of exhibiting improved temperature elevation-suppressing effect in summer and improved warm- keeping effect in winter. The composite film has a double- layered structure consisting of a transparent or translucent thermoplastic resin film as the substrate and a transparent overlayer of a polymeric resin formed on one surface of the substrate film and these two layers are correlated each with the other in relation to two newly defined parameters including "the total heat volume", which is a product of the overall weight and the specific heat capacity of the film, and "the absorptivity of radiation heat" defined in terms of the decrease in the radiation temperature of sunlight by transmitting the film, the overlayer having the total heat volume not exceeding 10% of that of the substrate film and the absorptivity of radiation heat not exceeding 60% of that of the substrate film.

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