Patent ID: 8920704

Claim:
Ducting usable for a fuel transfer pipeline for an aircraft, the ducting having at least one multilayer pipe comprising: a radially inner layer that is made of thermoplastic material based on at least one thermoplastic polymer chosen from the group consisting of polyamides (PA), polyetherimides (PEI), phenylene polysufides (PPS), polyetheretherketones (PEEK), polyetherketoneketones (PEKK) and mixtures thereof, or of a thermoplastic elastomer, and that is leakprook and chemically resistant to the fuel transported, and at least one reinforcing layer situated radially above the inner layer, wherein the pipe has a curved and/or bent three-dimentional geometry, and in that the reinforcing layer is made of a composite material based on reinforcing means that are in intimate and direct contact with the subjacent layer, said geometry being obtained by one of the following two methods a) and b): a) the inner layer is previously hot formed independently of the reinforcing layer so as to pass from an initial rectilinear geometry to this curved and/or bent geometry, said reinforcing means being of choice: (i) based on at least one cylindrical fibrous braid impregnated with a thermosetting matrix, the reinforcing layer forming a thermosetting composite with a thermosetting matrix having a curing temperature lower than the melting point of said subjacent layer, or (ii) based on at least one cylindrical fibrous braid intermixed with thermoplastic fibers or powders, or impregnated with a plastic polymeric coating that is curable chemically, the reinforcing layer forming in both these cases a thermoplastic composite with a thermoplastic matrix having a transformation temperature less than that of said subjacent layer; or b) the inner layer, in its initial rectilinear geometry, is first of all covered with the reinforcing layer in which said reinforcing means are based on at least one cylindrical fibrous braid intermixed with a thermoplastic material in the form of fibers, film or powder, and this inner layer covered in this way is then blow-molded after being softened in order to give the pipe its curved and/or bent geometry, the reinforcing layer obtained forming a composite with a thermoplastic matrix.