# US 12,179,918 B2 · Method for manufacturing a composite preform for the manufacture of a composite panel with double curvature geometry > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,179,918 B2 - Document ID: US12179918B2 - Status: Granted - Kind: B2 - Application number: 17/188,482 - Filed: 2021-03-01 - Published: 2021-06-17 - Granted: 2024-12-31 - Earliest claimed: 2018-08-27 - Assignees: Safran Nacelles - Applicants: Safran Nacelles - Inventors: Bertrand Leon Marie Desjoyeaux; Julien Lorrillard; Benjamin Provost - Web page: https://patentgrep.com/patent/US12179918B2 ## CPC - B64C 7/02: Nacelles - B29B 11/16: comprising fillers or reinforcement {(non-woven fabrics per se D04H1/00, D04H3/00)} - B29C 70/222: {the structure being shaped to form a three dimensional configuration} - B32B 5/073: {characterised by the fibrous or filamentary layer being mechanically connected to another layer by sewing, stitching, hook-and-loop fastening or stitchbonding} - B32B 5/26: another layer {next to it} also being fibrous or filamentary {(relative arrangement of fibres or filaments of different layers B32B5/12)} - D04H 3/10: with bonds between yarns or filaments made mechanically - D04H 3/115: by applying or inserting filamentary binding elements - D06C 3/00: Stretching, tentering or spreading textile fabrics; Producing elasticity in textile fabrics (shaping or stretching tubular fabrics upon cores or internal frames D06C5/00) - Y02T 50/40: Weight reduction - B64C: AEROPLANES; HELICOPTERS - B29B: PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - D04H: MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL (weaving D03; knitting D04B; braiding D04C; net-making D04G; sewing D05B; tufting D05C; finishing non-woven fabrics D06); FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING {; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION}(non-woven fabrics having an intermediate or external layer of a different kind, e.g. of woven fabric, B32B) - D06C: FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A method for manufacturing a preform for producing a part made of composite material with an unchangeable final shape includes supplying a triaxial non-woven textile comprising a layer of fibers orientated in a first direction, a layer of fibers orientated in a second direction, a layer of fibers orientated in a third direction, and seams extending parallel to each other and forming sheaths for the circumferential fibers, arranging the textile on an element of unchangeable shape by placing the seams parallel to the circumferential direction of the element, and sliding the circumferential fibers into the sheaths so that the textile is in continuous contact with the element. ## Claims ### Claim 1 A manufacturing method for manufacturing a preform for the manufacture of a part made of a composite material of a revolution or quasi-revolution non-developable final shape type, having a longitudinal axis, the manufacturing method comprising: a) providing a tri-axial non-woven fabric comprising: a first layer comprising circumferential fibers oriented in a first direction, a second layer comprising fibers, oriented in a second direction, a third layer comprising fibers, oriented in a third direction, and seams binding the fibers of the first layer, the second layer and third layer, the seams extending parallel to each other and forming sheaths for the circumferential fibers, b) disposing the tri-axial non-woven fabric on or in a non-developable shape element, either identical to a non-developable final shape, or of reduced dimensions compared to the non-developable final shape, by placing the seams parallel to a circumferential direction of the non-developable shape element, and c) sliding the circumferential fibers in the sheaths formed by the seams, so that the tri-axial non-woven fabric is in continuous contact with the non-developable shape element and is adapted to a non-developable shape of the non-developable shape element to manufacture the preform. ### Claim 2 (depends on 1) The manufacturing method according to claim 1, wherein c) is carried out by tensioning the circumferential fibers, so as to slide the circumferential fibers in the sheaths formed by the seams and unraveling the fibers of the second layer and the third layer. ### Claim 3 (depends on 1) The manufacturing method according to claim 1, wherein a pressure is produced on the tri-axial non-woven fabric in the direction of the non-developable shape element, by a bar. ### Claim 4 (depends on 1) The manufacturing method according to claim 1, wherein during c) the fibers of the second layer and the third layer are put in tension. ### Claim 5 (depends on 1) The manufacturing method according to claim 1, wherein the non-developable shape element is a convex shape element. ### Claim 6 (depends on 1) The manufacturing method according to claim 1, wherein the non-developable shape element is a concave shape element. ### Claim 7 (depends on 1) The manufacturing method according to claim 1, wherein the non-developable shape element has a reduced circumference with respect to the part of the non-developable final shape. ### Claim 8 (depends on 1) The manufacturing method according to claim 1, wherein the non-developable shape element has a circumference identical to the part of the non-developable final shape.