Plant husbandry – Greenhouse – apparatus or method
Patent
1994-11-14
1996-05-28
Raduazo, Henry E.
Plant husbandry
Greenhouse, apparatus or method
47DIG6, A01G 900
Patent
active
055199640
ABSTRACT:
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.
REFERENCES:
patent: 3043709 (1962-07-01), Amborski
patent: 3914469 (1975-10-01), Delano
patent: 4214034 (1980-07-01), Kodera
patent: 4250661 (1981-02-01), Kodera et al.
patent: 4895904 (1990-01-01), Allingham
Kujirai Masami
Kujirai Yukio
Kujirai Yumiko
Kabushiki Kaisha Sekuto Kagaku
Raduazo Henry E.
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