Method and device for manufacturing composites made from multi-filament fibers

A process for continuous manufacture of an elongate composite element comprising a bundle of strands of multifilament fibers embedded in a composition based on a polymerizable substance comprising the following steps:

• arranging strands of multifilament fibers of the bundle in an arrangement of multifilament fibers comprising a central strand, several intermediate strands positioned to form at least one intermediate layer surrounding the central strand, and at least one outer layer of peripheral strands, each strand comprising several multifilament fibers;
• and
• carrying along the arrangement of multifilament fibers in order to subject the arrangement of multifilament fibers, in the direction of forward progression, to:
• degassing of the arrangement of multifilament fibers by vacuum,
• impregnation of the arrangement of multifilament fibers with the composition in order to obtain impregnated strands,
• passage of the central strand, now impregnated, through a first die which carries out a partial polymerization of the composition,
• passage of each intermediate layer of intermediate strands, now impregnated, through an intermediate die which carries out a partial polymerization of the composition,
• passage of all the strands through a last die which brings all the strands together in a single elongate element, and
• exposure of the single elongate element to a source of radiation in order to carry out an additional polymerization so as to obtain the elongate composite element.