Method and system for manufacturing a shear web for a wind turbine

A method of manufacturing a shear web (50) for a wind turbine blade, the shear web having a web body and a first web foot flange at a first end of the web body and a second web foot flange at a second end of the web body, wherein the method comprises the steps of:

• a) providing an elongated lower web mould part (61) having a moulding surface with a central portion (71), which is substantially flat, a first downwardly extending moulding surface portion (72) at a first end of the lower web mould part (61), and a second downwardly extending moulding surface portion (73) at a second end of the lower web mould part (61);
• b) arranging one or more fibre layers (62, 64) on top of the elongated lower web mould part (61) and at least partly covering the first downwardly extending moulding surface portion (72), the central portion (71), and the second downwardly extending moulding surface portion (73);
• c) arranging a first backing plate (66) opposite to the first downwardly extending moulding surface portion (72) and arranging a second backing plate (68) opposite to the second downwardly extending moulding surface portion (73) to create a mould cavity between the first and second backing plates (66, 68) and the lower web mould part (61), wherein each of the first and second backing plates comprises an inner moulding surface (80), one or more outer surfaces (98, 100), and a groove (83) extending between at least one of the outer surfaces (98, 100) and the inner moulding surface (80) of the respective one of the first and second backing plates, wherein the one or more outer surfaces of each of the first and second backing plates comprise opposing first and second lateral surfaces, and wherein the groove (83) of each of the first and second backing plates extends through the inner moulding surface (80) between the opposing first and second lateral surfaces of the corresponding one of the first and second backing plates, the groove (83) extending from the first lateral surface to the second lateral surface;
• d) supplying resin to the mould cavity via the respective groove (83) of the first and second backing plates (66, 68);
• and
• e) curing or hardening the resin in order to form the shear web.