Greenhouse screen
AssigneeAB Ludvig Svensson
InventorsPer Holgerson, Sara Widén
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Abstract
A greenhouse screen is described with strips of film material that are interconnected by a yarn system of transverse threads and longitudinal threads by means of knitting, warp-knitting or weaving process to form a continuous product is disclosed. At least some of the strips include a film material in the form of a single- or multilayer polyethylene film having a thickness of 10-70 micrometers. Said film has at least 2-4 wt.-% SiO2 particles having a D50 of 2-10 micrometers. The film is advantageously used as a screen providing light scattering properties particularly suited for greenhouse applications.
Claims20
A greenhouse screen comprising strips of film material that are interconnected by a yarn system of transverse threads and longitudinal threads by means of knitting, warp-knitting or weaving process to form a continuous product, characterized in that at least some of the strips comprise a single- or multilayer film with a thickness of 20-50 micrometers, said single- or multilayer film comprising polyethylene, 2.0-4.0 wt.-% SiO2 particles by weight, based on the total weight of the single- or multilayer film, said SiO2 particles having a D50 of 5-7 micrometers, wherein the polyethylene is the only polymer in the single- or multilayer film, and wherein the single- or multilayer film has a spreading factor from 1.7 to 8 (measured as transparency according to ASTM D 1003-61, Method A/transparency measured by Clarityport).
Dependencies are inferred from the claim text.