Patent-family-84389267

A method of manufacturing a wind turbine rotor blade part (36), the method comprising the following steps:

-providing a placeholder (76) comprising a core member (10) and a sleeve (12), wherein the core member (10) comprises a longitudinal direction (14), a circumferential surface (16), a front end (18) and a back end (20), and the sleeve (12) comprises a peel ply layer (22), wherein the sleeve (12) covers the circumferential surface (16) and the back end (20) of the core member (10) and is affixed to the back end (20) of the core member (10);

-arranging the placeholder (76) together with reinforcing fibres and a matrix material in a mould (84);

-curing of the matrix material, so that the placeholder (76) is embedded in a fibre-reinforced composite material (34).