Alternative primer application method

A method of manufacturing a blade shell member for a wind turbine blade, the method comprising the steps of:

• providing a blade mould (70) for the blade shell member, the blade mould (70) comprising a moulding surface (71);
• arranging a number of fibre-reinforced layers (80) on the blade moulding surface (71) in order to form an outer shell of the blade shell member;
• applying a first primer layer (10) on top of the number of fibre-reinforced layers (80), at a pre-determined spar cap region (73);
• providing a pre-manufactured spar cap (100) having an upper surface (101), a lower surface (102), a first side surface (103), a second side surface (104), a first end surface (105) and a second end surface (106);
• arranging the pre-manufactured spar cap (100) on the spar cap region (73), such that the lower surface (102) of the pre-manufactured spar cap contacts the first primer layer (10) arranged on the spar cap region (73);
• applying a second primer layer (20) to the upper surface (101) of the pre-manufactured spar cap (100);
• arranging further fibre-reinforced layers on top of the pre-manufactured spar cap (100) in order to form an inner shell of the blade shell member;
• arranging a vacuum bag and sealing it against the blade mould (70) in order to form a moulding cavity (72) with the number of fibre-reinforced layers (80), the pre-manufactured spar cap (100), and the further fibre-reinforced layers in the moulding cavity (72);
• infusing the blade moulding cavity (72) with resin using assisted resin transfer moulding;
• and
• curing the resin to form the blade shell member as a unitary structure,
• wherein the providing of the pre-manufactured spar cap (100) comprises the steps of:
• providing a plurality of pultruded carbon elements (110, 120) and a number of interlayers (130) comprising fibre material for promoting resin flow between the pultruded carbon elements (110, 120);
• arranging the plurality of pultruded carbon elements (110, 120) in a stacked array, wherein the plurality of pultruded carbon elements (110, 120) are separated by the number of interlayers (130);
• and
• infusing the plurality of pultruded carbon elements (110, 120) with resin and curing to provide the pre-manufactured spar cap (100).