Method of manufacturing a wind turbine blade

A method of manufacturing a wind turbine blade comprising an aerodynamic shell forming an outer surface of the blade and at least one main laminate, especially a pre-bent wind turbine blade, the method comprising the steps of:

• a. providing a mould extending in a longitudinal direction;
• b. forming a longitudinally extending main laminate by arranging a fibre material lay-up comprising a plurality of longitudinally continuously extending fibre fabric layers or fibre plies placed on top of each other in the mould;
• c. during step b, providing at least one segmentation area in the fibre lay-up dividing the fibre lay-up into at least two fibre lay-up segments as seen in the longitudinal direction of the mould by providing at least one transverse flow barrier in the fibre lay-up, the at least one transverse flow barrier preventing or restricting longitudinal resin flow through the fibre lay-up past the flow barrier, wherein the at least one transverse flow barrier comprises a transverse strip of a second resin impregnated into and/or on a majority of the fibre fabric layers of the fibre material lay-up, the transverse strips of the majority of the fibre fabric layers being arranged above each other for preventing the longitudinal resin flow through the fibre material lay-up past the flow barrier;
• d. infusing the fibre lay-up in the mould with a first liquid resin supplied to the mould through one or more resin inlet(s);
• and
• e. allowing the first resin to cure,
• wherein step d is performed using Vacuum Assisted Resin Transfer Moulding (VARTM),
• wherein step d is performed after step c and prior to step e, and wherein step d comprises:
• providing a vacuum bag and arranging it on top the mould part,
• sealing the vacuum bag to the rigid mould part to provide a mould cavity,
• evacuating the mould cavity and supplying a first liquid resin to the mould cavity through a resin inlet.