Patent ID: 7803302

Claim:
Method of producing an oblong shell member made of fibre composite material by means of vacuum infusion, the method comprising: impregnating the fibre material with liquid polymer, and shaping the fiber composite material in a mould with a mould cavity, in which a fibre insertion ( 3 ) with a first lateral face ( 1 ) and a second lateral face ( 2 ) is placed, and where said fibre insertion further includes a plurality of fibre layers and a distribution layer ( 4 ), said distribution layer allowing a higher rate of flow for the liquid polymer than the fibre layers, a semi-permeable membrane ( 5 ) being placed opposite the first lateral face ( 1 ) of the fibre insertion, said semi-permeable membrane being substantially permeable to gasses and substantially impermeable to liquid polymer and further communicating with a vacuum source, characterized in that the distribution layer ( 4 ) is placed inside the fibre insertion ( 3 ) with fibre layers of the fibre insertion on both sides and is interrupted by a zone ( 6 ), and that the width of the zone ( 6 ) is smaller than the width of the fibre insertion ( 3 ), said zone extending in the longitudinal direction of the shell member and being positioned opposite the semi-permeable membrane ( 5 ), and in that liquid polymer is directed via inlet channels ( 7 , 8 ) to the distribution layer ( 4 ), thus creating a flow front ( 9 , 10 ) between the distribution layer ( 4 ) and the second lateral face ( 2 ), said flow front moving through the zone ( 6 ) towards the semi-permeable membrane ( 5 ).