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S. Kalfas


Polyethylene films used in greenhouse tunnels – methods of reducing infrared-light transmission


Polimery 1988, No 4, 148


DOI: dx.doi.org/10.14314/polimery.1988.148

Summary

The effect of modifying low-density polyethylene (PE-LD) with an ethylene-virnyl acetate copolymer (E/VAC) or aliphatic polyether on the transmission of infrared and visible light through PE-LD film has been investigated. The effeciency of these modifiers has been evaluated on the basis of results of determinations of IR-light transmission in the range of wavelengths from 1450 to 730 cm-1 and of visible light in the wavelength range of 400—660 nm. It has been found that a composition containing 60% by weight of PE-LD and 40% by weight of E/VAC copolymer or 95% by weight of PE-LD and 5% by weight of an aliphatic polyether gave thermoinsulating films with IR-light transmission below 20% and a high visible light transmission, the latter being responsible for plant growth. These modifiers do not deteriorate the mechanical properties of films. No positive results have been obtained when using inorganic substances (natural calcium carbonate, precipitated chalk) as modifiers of PE-LD films.



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