Importance

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Abstract

A wind turbine blade is disclosed, at least 50% of the surface of which is covered with a self-adhesive, thermoplastic film. A method of manufacturing and repairing such a wind turbine blade is also disclosed. A two layer thermoplastic film suitable for covering the surface of a wind turbine blade is also disclosed. The film comprises a surface layer and a lower layer. The surface layer comprises 50% to 85% of polyvinylidene fluoride (PVDF), wherein up to 30% of the polyvinylidene fluoride may be replaced by hexafluoropropylene (HFP); and 10% to 45% polymethyl methacrylate (PMMA). The lower layer comprises 10% to 45% of a polyvinylidene fluoride (PVDF) polymer, wherein up to 30% of the polyvinylidene fluoride may be replaced by hexafluoropropylene (HFP); and 50% to 85% PMMA. Optionally the surface and/or lower layer comprises up to 8% UV stabilisers/absorbers; up to 10% matting agent; and up to 40% of an inorganic pigment. The film has an initial gloss of less than 30% when measured with a reflectometer at a angle of 60 degrees.

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First Claim