Abstract: A method for manufacturing stringers for aircraft, wherein the stringer comprises two semi-stringers, includes steps of placing tows on a flat surface for forming the semi-stringers independently or at the same time, the placement being made by partially overlapping the tows and orientating the tows on the flat surface according to boundaries of the flat surface, the tows covering the boundaries of the flat surface; and cutting the tows so that a shape of the tows corresponds to the shape of the flat surface defined by boundaries of the flat surface.

Abstract: Inspection methods and systems for detecting leaks in a vacuum bag assembly used in the manufacture of a composite part based on spraying helium over the vacuum bag and detecting the helium drawn by the vacuum inside the vacuum bag through a leak. The inspection methods comprise creating a local helium atmosphere in a chamber over the vacuum bag assembly by zones, following a programmed zonal sequence, for a first leak detection test of each zone and a subsequent second leak detection test if the first test gives a positive result. The inspection systems comprise a helium spraying system and helium detecting equipment arranged to implement the inspection methods.

Abstract: Inspection methods and systems for detecting leaks in a vacuum bag assembly used in the manufacture of a composite part based on spraying helium over the vacuum bag and detecting the helium drawn by the vacuum inside the vacuum bag through a leak. The inspection methods comprise creating a local helium atmosphere in a chamber over the vacuum bag assembly by zones, following a programmed zonal sequence, for a first leak detection test of each zone and a subsequent second leak detection test if the first test gives a positive result. The inspection systems comprise a helium spraying system and helium detecting equipment arranged to implement the inspection methods.

Abstract: A defect recognition procedure in prepreg materials (1) draws a first transversal cross line (4b) at the beginning boundary (3b) of a defective area (2) in a prepreg material (1). A second transversal cross line (4e) at the end boundary (3e) of a defective area (2) is drawn as well. The cross lines (4b, 4e) form an angle (?) with respect to the prepreg material (1) motion direction (5). Each transversal cross line (4b, 4e) delimiting the beginning and the end of a defective area (2) has identification codes (Bi, Ei).

Abstract: A defect recognition procedure in prepreg materials (1) draws a first transversal cross line (4b) at the beginning boundary (3b) of a defective area (2) in a prepreg material (1). A second transversal cross line (4e) at the end boundary (3e) of a defective area (2) is drawn as well. The cross lines (4b, 4e) form an angle (?) with respect to the prepreg material (1) motion direction (5). Each transversal cross line (4b, 4e) delimiting the beginning and the end of a defective area (2) has identification codes (Bi, Ei).

Abstract: A prepreg peel ply material (21) to be used for improving the surface roughness of a composite laminate (13) comprising a backing paper (23) and a base fabric (27) impregnated with a thermosetting resin, wherein the adherence between the backing paper (23) and the base fabric (27), measured by a peeling off parameter P is comprised between 2.9-3.5 min/N/cm2 and the adherence between the base fabric (27) and the composite material, measured by said parameter P is comprised between 130-160 min/N/cm2. The invention also refers to a method for determining the adaptability to an ATL machine of a prepreg peel ply material (21) including the obtention of said parameter P and to a method for manufacturing a composite component comprising an step of laying-up a peel ply base fabric (27) with an ATL machine as the last layer of said component and even as the first layer.