Greenhouse screen
AssigneeAB Ludvig Svensson
InventorsPer Holgerson, Daniel Asplund
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Abstract
A greenhouse screen comprising strips of film material that are interconnected by a yarn system of transverse threads and longitudinal threads by means of a knitting, warp-knitting or weaving process to form a continuous product is provided. At least some of the strips comprise a polyester film having a transparency of at least 93%, said polyester film having at least one base layer B comprising a thermoplastic polyester and a UV stabilizer. The polyester film has a first and a second surface, wherein a permanent anti-fog coating is applied to at least one of the first or second surfaces of the polyester film. The anti-fog coating has a lower refractive index than the base layer B.A process for producing said film is also disclosed.
Claims27
A greenhouse screen comprising strips of film material that are interconnected by a yarn system of transverse threads and longitudinal threads by means of a knitting, warp-knitting or weaving process to form a continuous product, wherein at least some of the strips comprise a polyester film having a transparency of at least 93% as measured according to ASTM-D 1003-6 (method A), said polyester film having at least one base layer B comprising a thermoplastic polyester and a UV stabilizer, said polyester film has a first and a second surface, wherein an anti-fog coating is applied to at least one of the first or second surfaces of the polyester film, wherein said anti-fog coating is a dispersion composition and comprises
- a) a hygroscopic, porous material;
- b) a polymer-based crosslinker;
- c) an adhesion-promoting organofunctional silane;
- and
- d) one or more surfactants;
- said anti-fog coating has a thickness of at least 60 nm and at the most 150 nm, and a refractive index of below 1.64 at a wavelength of 589 nm in the machine direction (MD) of the film, said refractive index being lower than the refractive index of base layer B.
Dependencies are inferred from the claim text.