Patent ID: 7351040

Claim:
A method of manufacturing a root portion of a wind turbine blade, the wind turbine blade including a root portion, a main portion, and a tip portion, said method comprising: providing an outer layer of reinforcing fibers comprising at least two woven mats of reinforcing fibers; providing an inner layer of reinforcing fibers having an inner surface and an outer surface and comprising at least two woven mats of reinforcing fibers; positioning at least two bands of reinforcing fibers between the inner and outer layers, each band of reinforcing fibers comprising at least two woven mats of reinforcing fibers; positioning a mat of randomly arranged reinforcing fibers between each pair of adjacent bands of reinforcing fibers; introducing a polymeric resin into the root potion of the wind turbine blade; infusing the resin through the outer layer, the inner layer, each band of reinforcing fibers, and each mat of random reinforcing fibers; and curing the resin to form the root portion of the wind turbine blade.