Textile covering for rotor blades and use of the textile covering
The present invention relates to a covering for rotor blades comprising a fabric and a protective top layer, the covering having a weight of up to 800 g/m 2 , the covering having an elongation at break in both a warp and a weft direction of at least 20%, wherein the elongation at break is determined according to ISO 13934-1:2013, wherein the protective top layer is a film, and wherein the protective top layer is laminated to the fabric. The invention also relates to a use of the covering for covering rotor blades of a wind turbine.
1 . Covering for rotor blades comprising a fabric and a protective top layer, wherein:
the covering has a weight of at most 800 g/m2,
the covering has an elongation at break in both a warp direction and a weft direction of at least 20%, wherein the elongation at break is determined according to ISO 13934-1:2013,
the protective top layer is a film, and
the protective top layer is laminated to the fabric.
2 . Covering according to claim 1 , wherein the protective top layer is a film comprising thermoplastic polyurethane.
3 . Covering according to claim 1 , wherein the protective top layer is laminated to the fabric with the aid of a reactive aromatic or aliphatic fire-retardant polyurethane glue.
4 . Covering according to claim 1 , wherein weft and warp threads of the fabric comprise fire-retardant polyester.
5 . Covering according to claim 1 , wherein the weft and warp threads have a tensile strength of at least 6.5 cN/dtex.
6 . Covering according to claim 1 , wherein the weft and warp threads have a yarn count of at least 600 dtex.
7 . Covering according to claim 1 , wherein the fabric comprises at least 6 warp threads and at most 16 warp threads per cm and at least 6 weft threads and at most 16 weft threads per cm.
8 . Covering according to claim 1 , wherein the fabric has a plain weave.
9 . Covering according to claim 1 , wherein the fabric has a tensile strength according to both the warp direction and the weft direction of at least 1800 N, the tensile strength being determined in accordance with ISO 13934-1:2013.
10 . Covering according to claim 1 , wherein the fabric can withstand a tear force of at least 70 N in a test according to ISO 13937-2:2000 in both the warp direction and the weft direction.
11 . Covering according to claim 1 , wherein the covering has a reflectivity of less than 30 GU at an angle of 60°, determined according to ISO 2813:2014.
12 . Covering according to claim 1 , wherein the fabric comprises a polymeric fabric, the protective top layer comprises a polymer, and the covering has a glass transition point of at least 65° C.
13 . Covering according to claim 1 , wherein the covering a side of the fabric, lying opposite a side to which the protective top layer has been laminated, has a wear resistance of at least one hundred thousand cycles, determined according to ISO 12947-2:2016.
14 . Covering according to claim 1 , wherein there is an adhesive force of at least 80 N/50 mm between the protective top layer and the fabric, determined according to ISO 2411:2017.
15 . Use of a covering for covering wind turbine rotor blades, wherein the covering for rotor blades comprises a fabric and a protective top layer, wherein:
the covering has a weight of at most 800 g/m2,
that the covering has an elongation at break in both a warp direction and a weft direction of at least 20%, wherein the elongation at break is determined according to ISO 13934-1:2013,
that the protective top layer is a film, and
that the protective top layer is laminated to the fabric.
16 . A rotor blade, comprising:
a covering, consisting of:
a fabric comprising a polymer,
a polymeric protective top layer, which is a film and is laminated to the fabric, and
an adhesive layer between the fabric and the protective top layer,
wherein:
the covering has a weight of at most 800 g/m2,
the covering has an elongation at break in both a warp direction and a weft direction of at least 20%, wherein the elongation at break is determined according to ISO 13934-1:2013.
17 . The rotor blade according to claim 16 , wherein the polymeric protective top layer comprises thermoplastic polyurethane.
18 . The rotor blade according to claim 16 , wherein the fabric comprises weft and warp threads comprising a fire-retardant polyester.
19 . The rotor blade according to claim 16 , wherein the adhesive layer comprises a reactive aromatic or aliphatic fire-retardant polyurethane glue.