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1. (WO2019007471) A METHOD OF COATING A ROTOR BLADE FOR A WIND TURBINE
Anmerkung: Text basiert auf automatischer optischer Zeichenerkennung (OCR). Verwenden Sie bitte aus rechtlichen Gründen die PDF-Version.

Claims

1 . A method of coating an area of a wind turbine rotor blade, the method comprising:

(i) defining an area to be coated on a surface of the blade;

(ii) applying a first plurality of strips of masking tape to the surface of the blade proximate a first edge of the defined area such that each strip is arranged adjacent to at least one other strip of said first plurality of strips;

(iii) spraying a coating layer onto the defined area up to an innermost strip such that the innermost strip defines an edge of the coating layer;

(iv) removing the innermost strip(s) to expose an uncoated region of the defined area between the edge of the coating layer and an innermost remaining strip;

(v) spraying a further coating layer over the previous coating layer and over the uncoated region up to said innermost remaining strip; and

optionally repeating steps (iv) and (v) until a coating having a desired thickness is achieved.

2. The method of Claim 1 , wherein step (ii) further comprises:

applying a second plurality of strips of masking tape to the surface of the blade proximate a second edge of the defined area such that each strip of the second plurality of strips is arranged adjacent to at least one other strip of the second plurality of strips, wherein step (iii) comprises spraying the coating layer onto the defined area between the innermost strips of the first and second plurality of strips and step (iv) comprises removing the innermost strip(s) of the first and second plurality of strips prior to spraying a further coating layer.

3. The method of Claim 2, wherein step (ii) comprises applying the first plurality of strips to one of a pressure surface or a suction surface of the blade, and applying the second plurality of strips to the other of the pressure surface or the suction surface.

4. The method of any preceding claim, wherein the defined area is a leading edge region of the blade comprising a leading edge of the blade.

5. The method of any preceding claim, further comprising allowing the coating layer to dry prior to spraying the further coating layer in step (v).

6. The method of any preceding claim, wherein step (iv) comprises removing the innermost strip(s) while the coating layer is still wet so that the coating flows towards the innermost remaining strip.

7. The method of any preceding claim, wherein step (ii) comprises temporarily adhering the strips to the surface of the rotor blade.

5 8. The method of any preceding claim, comprising spraying an outermost coating layer, such that the outermost coating layer is thinner than at least one inner coating layer beneath the outermost coating layer.

9. An assembly comprising a wind turbine rotor blade and an apparatus for applying a coating 10 on a defined area of a surface of said wind turbine rotor blade according to the method of any preceding claim, the apparatus comprising:

a plurality of strips of masking tape arranged on the surface of the rotor blade and aligned with each other proximate a leading edge of the rotor blade; and

means for spraying a coating composition onto the leading edge of the rotor blade up 15 to an innermost strip of the plurality of strips.

10. The method or assembly of any preceding claim, wherein the plurality of strips of masking tape includes at least four strips, two of the strips being arranged on a pressure side of the leading edge and two of the strips being arranged on a suction side of the leading edge.

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11. The method or assembly of any preceding claim, wherein each strip of the plurality of strips of masking tape is shaped such that, when the strips are attached to the surface of the blade, a portion of each strip overhangs the defined area to be coated, wherein an overhanging portion of a strip serves to create a tapered edge in a coating layer sprayed up to said strip.

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12. The method or assembly of any preceding claim, wherein the plurality of strips of masking tape are made from a foam or rubber material.

13. A wind turbine blade comprising a leading edge protection coating covering a leading edge 30 region of a surface of the blade, wherein the leading edge protection coating comprises:

an outer coating layer; and

at least one inner coating layer between the outer coating layer and the surface of the blade, wherein the outer coating layer extends beyond at least one edge of the at least one inner coating layer in a direction towards a trailing edge of the blade such that the leading 35 edge protection coating tapers in thickness in a direction towards the trailing edge.

14. The wind turbine blade of claim 13, wherein the at least one inner coating layer includes an innermost coating layer and at least one intermediate coating layer between the innermost coating layer and the outer coating layer, the at least one intermediate coating layer extending beyond at least one edge of the innermost coating layer in a direction towards the trailing edge of the blade.

15. The wind turbine blade of claim 3 or 14, wherein each of the coating layers tapers in thickness in a direction towards the trailing edge of the blade.