NOVELTY - The reinforcement (1) for molding a fiber based layer, comprises parallel glass fiber meshes (2a) arranged side by side in the fiber based layer to form a reinforcement layer (2), a layer (3) for joining the glass fiber meshes, and an intermediate layer placed between the reinforcement layer and the fiber joining layer. The layer joining the fibers comprises sections (3a, 3b) with thermofusible surface. Some of the sections penetrate according to their length in the reinforcement layer and partially adheres between the glass fibers of the reinforcement layer.    USE - The reinforcement for molding a fiber based layer is useful for manufacturing wind turbine blades and other composite parts (claimed).    ADVANTAGE - The reinforcement exhibits high flexibility and high strain capacity, effectively molds a fiber based layer without risk of fraying or degradation of the edges of the fiber based layer, and provides good penetration of the resin during molding thus desirably increasing the mechanical properties such as tensile strength and bending resistance of the composite parts.    DETAILED DESCRIPTION - The reinforcement (1) for molding a fiber based layer, comprises parallel glass fiber meshes (2a) arranged side by side in the fiber based layer to form a reinforcement layer (2), a layer (3) for joining the glass fiber meshes, and an intermediate layer placed between the reinforcement layer and the fiber joining layer. The layer joining the fibers comprises sections (3a, 3b) with thermofusible surface. Some of the sections penetrate according to their length in the reinforcement layer and partially adheres between the glass fibers of the reinforcement layer. The meshes of glass fiber have a content of 2400-4800 tex. The glass fibers are formed of an assembly of filaments having a diameter of 14-17 mu m, and have a content of 40-80 tex. The intermediate layer comprises parallel glass fiber layers of 160-200 tex perpendicularly oriented to the meshes, and/or a cut layer of glass fibers of 50 mm in all directions according to a weight of 50-80 g/m2. The reinforcement layer is joined to two layers with thermofusible surface disposed one another from the reinforcement layer. The reinforcement has a weight of 400-1800 g/m2, and is present in the form of a web-conditioned continuous band. The meshes are formed of continuous glass fibers and oriented along the direction of band. An INDEPENDENT CLAIM is included for a process for fabricating a molding reinforcement.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic cross-sectional view of a molding reinforcement.    Molding reinforcement (1)    Reinforcement layer (2)    Meshes (2a)    Joining layer (3)    Sections with thermofusible surface. (3a, 3b)