NOVELTY - Production of a fiber layer with a longitudinal direction involves spreading out fiber bundles of the same or different fineness, guided in parallel, then bringing the bundles together in overlapping form to cause mechanical consolidation, so that at least one fiber strip is obtained as an oriented layer of defined width, without use of additional fixing agent and/or additional mechanical or physical fixing procedures.    USE - The fiber assemblies are useful for reinforcing composite materials. In particular the use of the assemblies is claimed in wind power plants, in the transport sector (e.g. in automobiles, ships, aircraft, spacecraft or rail vehicles), in sports equipment and in the construction and building sector. Also claimed are elements or devices containing the fiber assemblies, for use in wind power plants, in the transport sector (e.g. in automobiles, ships, aircraft, spacecraft or rail vehicles), in sports equipment and in the construction and building sector.    ADVANTAGE - The fiber assemblies are produced by a simplified procedure based on blending the individual fibrous components together, thus avoiding use of adhesives or thermoplastic binding fibers. The process avoids local accumulation of fibers, provides an even transverse distribution of filaments and improves the final structural component properties of the fiber assemblies.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a fiber assembly consisting of one or more directed layers of different orientation, obtained by providing an assembly of at least one fiber layer with a longitudinal direction, containing containing partially or completely mutually aligned directing layers, without use of additional fixing agent and/or additional mechanical or physical fixing procedures. More than 70 (preferably at least 99) wt. % of each layer is of carbon, precursor, ceramic, glass and/or polymer (e.g. aramid) fibers.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic diagram of typical apparatus for mechanically consolidating fiber layers, which includes turning sites for spreading fiber bundles, fixed turning sites and guides for combining fiber bundles separately spread in two or three planes. (Drawing includes non-English language text).