US 12,290,981 B2
3D printing apparatus for layer-by-layer fabrication of objects using layer transfer printing
Klaus Eller, Burghausen (DE); and Johannes Neuwirth, Oberndorf (AT)
Assigned to Wacker Chemie AG, Munich (DE)
Appl. No. 18/026,622
Filed by Wacker Chemie AG, Munich (DE)
PCT Filed Sep. 22, 2020, PCT No. PCT/EP2020/076421
§ 371(c)(1), (2) Date Mar. 16, 2023,
PCT Pub. No. WO2022/063393, PCT Pub. Date Mar. 31, 2022.
Prior Publication US 2023/0330927 A1, Oct. 19, 2023
Int. Cl. B29C 64/141 (2017.01); B29C 64/245 (2017.01); B29C 64/268 (2017.01); B29C 64/357 (2017.01); B29C 64/40 (2017.01); B33Y 10/00 (2015.01); B33Y 30/00 (2015.01); B33Y 40/00 (2020.01); B33Y 40/20 (2020.01)
CPC B29C 64/141 (2017.08) [B29C 64/245 (2017.08); B29C 64/268 (2017.08); B29C 64/357 (2017.08); B29C 64/40 (2017.08); B33Y 10/00 (2014.12); B33Y 30/00 (2014.12); B33Y 40/00 (2014.12); B33Y 40/20 (2020.01)] 17 Claims
OG exemplary drawing
 
1. A method of layer-by-layer production of objects by laser transfer printing in a 3D print apparatus, comprising:
providing a 3D print apparatus comprising at least one plate, at least one laser source, and at least one carrier cylinder, wherein the material of the at least one carrier cylinder is transparent to at least one laser beam from the at least one laser source, and wherein the laser source is disposed above the at least one carrier cylinder, wherein the method further comprises the steps of:
(a) coating at least part of the outer surface of the at least one carrier cylinder with at least one print material;
(b) irradiating the at least one carrier cylinder with the at least one laser beams from the at least one laser source, such that at least a portion of the applied at least one print material is detached from the at least one carrier cylinder and transferred to the at least one plate, to an extrinsic component positioned thereon or to a previously applied print material layer, wherein the irradiation is effected in such a way that the at least one laser beams hits the at least one print material applied to the lower side of the carrier cylinder directly through both walls of the carrier cylinder from outside the carrier cylinder;
(c) forming a print material layer by curing the at least one print material transferred in step (b); and
(d) repeating steps (a) to (c) until the object has been fully constructed.