# US 11,077,611 B2 · Method and device for producing 3D shaped articles with a double recoater > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,077,611 B2 - Document ID: US11077611B2 - Status: Granted - Kind: B2 - Application number: 15/558,462 - Filed: 2016-03-10 - Published: 2018-03-22 - Granted: 2021-08-03 - Earliest claimed: 2016-03-10 - Assignees: Voxeljet AG - Applicants: Voxeljet AG - Inventors: Ingo Ederer; Bastian Heymel - Web page: https://patentgrep.com/patent/US11077611B2 ## CPC - B29C 64/165: using a combination of solid and fluid materials, e.g. a powder selectively bound by a liquid binder, catalyst, inhibitor or energy absorber - B05C 19/04: the particulate material being projected, poured or allowed to flow onto the surface of the work (B05C19/02 takes precedence; involving spraying or electrostatic projection B05B ){(B05C19/005 takes precedence)} - B22F 12/226: {for rotary motion} - B22F 12/52: Hoppers - B22F 12/57: Metering means - B22F 12/67: Blades - B29C 31/02: Dispensing from vessels, e.g. hoppers {(into a mould cavity B29C31/04; large containers characterised by discharge means B65D88/28, B65D88/54)} - B29C 64/214: Doctor blades - B33Y 10/00: Processes of additive manufacturing - B33Y 30/00: Apparatus for additive manufacturing; Details thereof or accessories therefor - B22F 10/14: by jetting of binder onto a bed of metal powder - Y02P 10/25: Process efficiency - 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) - B05C: APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (spraying apparatus, atomising apparatus, nozzles B05B; plant for applying liquids or other fluent materials to objects by electrostatic spraying B05B5/08) - B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER - B33Y: ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract The invention relates to a method and device for producing 3D moulded parts by means of a layer construction technique wherein a recoater is used which can coat in both directions of movement. ## Claims ### Claim 1 A method of producing a 3D moulded part by means of a layer application technique, comprising the steps of: i) applying a layer of a particulate material onto a construction field with a coater device, while the coater devoice moves in a first direction; and ii) applying a layer of the particulate material on the construction field with the coater device, while the coater device moves in a different direction; wherein the coater device includes two coating blades and two particle application openings, wherein the number of the coating blades is two and the number of the particle application openings is two; wherein the steps of applying the particulate material in the first and different directions are repeated, wherein the steps of applying the particulate material in the first direction and the in the different direction employ different blades, different particle openings, or both; wherein the method includes a step of selectively solidifying the particulate material; wherein the steps for applying the particulate material and selectively solidifying the particulate material are repeated until the 3D moulded part has been formed; wherein each particle application openings extends from one particle reservoir or from different particle reservoirs; wherein the coater device includes two discharge gaps and two sealing gaps. ### Claim 2 A method of producing a 3D moulded part by means of a layer application technique, comprising the steps of: i) applying a layer of a particulate material onto a construction field with a coater device, while the coater device moves in a first direction; and ii) applying a layer of the particulate material on the construction field with the coater device, while the coater device moves in a different direction; wherein the coater device includes one or two coating blades and one or two particle application openings, wherein: a) a number of the coating blades is two and a number of the particle application openings is one, or b) the number of the coating blades is two and the number of the particle application openings is two, or c) the number of the coating blades is one and the number of the particle application openings is one; wherein the steps of applying the particulate material in the first and different directions are repeated, wherein the steps of applying the particulate material in the first direction and the in the different direction employ different blades, different particle openings, or both; wherein the method includes a step of selectively solidifying the particulate material; wherein the steps for applying the particulate material and selectively solidifying the particulate material are repeated until the 3D moulded part has been formed; wherein each particle application openings extends from one particle reservoir or from different particle reservoirs; wherein the coater device include two discharge gaps and two sealing gaps.