UV light and protective film
A contact transparent single layer or multilayer film absorbing and/or reflecting UV radiation and short-wavelength visible light is disclosed. The film comprises at least one layer based on at least one optionally modified thermoplastic olefin homo- or co-polymer, comprising a combination of at least one organic or inorganic colored pigment or dye absorbing and/or reflecting short-wavelength visible light, and of at least one organic or inorganic compound absorbing and/or reflecting the UV radiation. The film disclosed herein can be used as a protective film against the effects of UV radiation and short-wavelength visible light, and a sewer cleaning system comprising said multilayer film as an external hose film and an inner, multilayer plastic film, and an impregnated UV-curable carrier material present between the two hose films.
1. A sewer pipe restoration system suitable for a tube lining technique, comprising a double-walled tube consisting of an external protective film in tubular form, an internal multilayer plastic tubular film, and an impregnated carrier material that is present between the two tubular films, wherein said external protective film comprises at least one layer based on at least one optionally modified thermoplastic olefin homo- or copolymer, said polymer comprising a combination of at least one organic or inorganic colored pigment or dye absorbing and/or reflecting short-wavelength visible light, and of at least one organic or inorganic compound absorbing and/or reflecting the UV radiation, wherein the impregnated carrier material can be cured by UV radiation.
2. A sewer pipe restoration system according to claim 1 , wherein the internal multilayer tubular film comprises a layer a) of at least one polyolefin, at least one olefin copolymer or of a mixture of polyolefins, which comes in direct contact with the carrier material, an adhesion promoter layer b), a barrier layer c) based on polyamide, a further adhesion promoter layer d) and a layer c) based on at least one olefin homo- or copolymer.
3. A sewer pipe restoration system according to claim 1 wherein the impregnated carrier material is a glass fiber material impregnated with and unsaturated resin system.