Patent ID: 8216500
Filing Date: 2012-07-10
Classification: B29C,B29L,F03D,F05B,F05C,Y02E,Y02P

Abstract:
1. A method of manufacturing a blade shell half of a pre-bent wind turbine blade comprising two blade shell halves interconnected along a leading edge and a trailing edge, said blade having a root region, an airfoil region with a tip region, optionally a transition region between the root region and the airfoil region, and a centre line defined by the centre line of the normally cylindrically shaped root region, the blade shell half made of a fibre composite material by means of vacuum-assisted resin transfer moulding (VARTM), wherein fibre material is impregnated with liquid resin in a mould cavity of a mould including a rigid mould part with a rim and a mould surface forming an outer surface of the blade shell half, said method comprising the following steps: a. placing a fibre lay-up including a number of fibre layers on the mould surface; b. placing a distribution layer above the fibre lay-up; c. providing at least one segmentation area in the distribution layer by dividing the distribution layer into at least two distribution layer segments as seen in a longitudinal direction of the rigid mould part by providing at least one transversely extending flow barrier in the distribution layer preventing or restricting longitudinal resin flow through the distribution layer; d. placing at least one first longitudinally extending feed channel above the distribution layer, said first feed channel open towards the distribution layer so as to provide resin communication therewith, and said first feed channel extending substantially from the root region to the tip region and divided into at least two separate feed channel sections, a feed channel section arranged in each distribution layer segment; e. arranging a vacuum bag on top of the rigid mould part and sealing the vacuum bag to the mould part to define the mould cavity; f. evacuating the mould cavity; g. supplying liquid resin to each feed channel section through a resin inlet so as to feed the resin to each of the at least two segments of the distribution layer in order to fill the mould cavity and to impregnate the fibre lay-up; and h. allowing resin to cure so as to form the blade shell half.