US Patent 8007624 Method of manufacturing wind turbine blades comprising composite materials

Method of manufacturing wind turbine blades having composite materials is provided that includes selecting an outer mould part, selecting an inner mould part, wherein at least a part of the surface of the inner mould part comprises a compressible layer being covered by an airtight membrane, positioning the composite materials in a mould cavity between the outer mould part and the inner mould part, evacuating the mould cavity, and bonding the composite materials, evacuating the compressible layer before positioning the composite materials.