US 11,673,327 B2
Apparatus for 3D printing of bottom-up photo-curing type, with independent elastic membrane system and tilting reference and relative methods of use
Gianni Zitelli, Padua (IT); Federico Iacovella, Padua (IT); Vittorio Gaudino, Padua (IT); and Massimo Petrilli, Padua (IT)
Assigned to Sisma S.p.A., Piovene Rocchette (IT)
Appl. No. 17/42,223
Filed by Sisma S.p.A., Piovene Rocchette (IT)
PCT Filed Mar. 27, 2019, PCT No. PCT/IT2019/050068
§ 371(c)(1), (2) Date Sep. 28, 2020,
PCT Pub. No. WO2019/186611, PCT Pub. Date Oct. 3, 2019.
Claims priority of application No. 102018000004065 (IT), filed on Mar. 29, 2018.
Prior Publication US 2021/0023784 A1, Jan. 28, 2021
Int. Cl. B29C 64/20 (2017.01); B29C 64/245 (2017.01); B33Y 10/00 (2015.01); B33Y 30/00 (2015.01); B29C 64/135 (2017.01)
CPC B29C 64/245 (2017.08) [B29C 64/135 (2017.08); B33Y 10/00 (2014.12); B33Y 30/00 (2014.12)] 8 Claims
OG exemplary drawing
 
1. Apparatus for 3D printing of bottom-up photo-curing type, comprising a light source (26) above which a tank (10) containing a photo-curing liquid material (24) is placed (24) inside which it is immersed an extraction plate (25), which is configured for alternating rectilinear motion, along a direction perpendicular to the bottom of said tank (10) from a position at a distance from the bottom of said tank (10) equal to the thickness of a layer (27) obtainable by photo-curing of said photo-curing liquid material (24), the bottom (14) of said tank (10) being constituted by an elastic membrane (23) transparent to the radiation of said light source (26), said tank (10) being positioned in correspondence with a hole (13) of a support plate (12), said hole being provided with a rigid support (11), transparent to the radiation of said light source (26), wherein said rigid support (11) is configured for displacing with respect to said hole (13), from a position in which said rigid support (11) occupies said hole (13), and is in contact with elastic membrane (23), to a position in which said rigid support (11) deviates from said hole (13) and from said elastic membrane (23), wherein an adhesive component comprising a layer of an adhesive is applied between said elastic membrane (23) and said rigid support (11) and configured to control a reversible movement of said elastic membrane (23) with respect to said tank (10) in response to said displacing of said rigid support (11), wherein the elastic membrane (23) being at least partly detachable from the rigid support (11), and the adhesive component being configured to control detachment of the elastic membrane (23) from the rigid support (11) to reduce mechanical stress the elastic membrane (23) is subjected to.