Patent ID: 8899546

Claim:
A mould for moulding a wind turbine blade, the mould comprising: a mould body having a front moulding surface and a rear face, the mould body comprising a sandwich construction having a central core layer between front and rear layers respectively comprising the front moulding surface and the rear face, and the core layer being composed of a lightweight material selected from polymeric foam or balsa wood, the mould body having at least one cylindrical tube therein defining a plurality of laterally spaced heating elements for conveying a heating liquid therethrough, the at least one tube being disposed between the core layer and the front layer, wherein each spaced heating element is received in a respective channel of triangular or trapezoidal cross-section formed between the front moulding surface and the core layer and the channels are correspondingly laterally spaced and wherein each channel is filled with a heat conducting paste which surrounds the heating element in the channel, and a continuous layer of heat conductive material located in the thickness direction of the mould body between the plurality of laterally spaced heating elements and the front moulding surface and extending laterally across the space between adjacent heating elements, wherein the continuous layer of heat conductive material is disposed between rear and front laminate layers of the front layer, and the front laminate layer defines the front moulding surface.