LOKEREN: Composite structures specialist Acrosoma is fine-tuning a three-dimensional "stitched" sandwich panel for use in beefing up the internal elements of the next generation of longer, heavier wind turbineblades. The sandwich panels are composite laminates made up of two thin, stiff, strong and dense "skins" bonded to either side of a thick core material, creating a strong, light product with high bending stiffness..