Patent ID: 8920704
Filing Date: 2014-12-30
Classification: B29C,B29D,B29K,B29L,B64D,F16L,Y10T

Abstract:
1. 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: 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.