Patent ID: 7014806

Claim:
A method for producing a prepreg for manufacturing a closed fiber reinforced frame, said method comprising the following steps: a) providing a carrier substrate ( 1 ) made of fiber material defining a first plane, b) providing at least one ring section ( 2 ) of foldable fiber material having a given orientation of fibers relative to each other in said foldable fiber material, c) securing said at least one ring section ( 2 ) to said carrier substrate ( 1 ) along a folding line ( 7 ) thereby dividing said at least one ring section ( 2 ) into two ring portions ( 2 A, 2 B) so that one of said two ring portions ( 2 A, 2 B) becomes foldable to form a flange ( 8 ) for said frame in a second plane extending at an angle relative to said first plane without disturbing said given fiber orientation by said securing, d) and impregnating said carrier substrate ( 1 ) and said at least one ring section ( 2 ) with a resin matrix material to form said ring prepreg.