A device (1) for producing a three-dimensional layered object (T) wherein a modelling platform (2) defines a support plane (3) that is housed in a printing chamber (6);
- the device (1) further comprising a cooling device (7) designed to cool the printing chamber (6);
- the device (1) comprising:
- a first selective deposition device (8) for a first liquid (9);
- a second selective deposition device (10) for a second liquid (11);
- the first liquid (9) has a melting temperature (T1) such that the first liquid (9) changes state passing from the liquid state to the solid state when it is dispensed onto the modelling platform (2) and the printing chamber (6) is cooled;
- the second liquid (11) has a melting temperature (T2) such that the second liquid (11) changes state passing from the liquid state to the solid state when it is dispensed onto the modelling platform;
- the melting temperature (T2) is greater than the melting temperature (T1);
- the modelling platform (2), the first selective deposition device (8), the second selective deposition device (10) and the cooling device (7) are movable/operable due to the control of an electronic unit (4) so as to carry out the following steps:
- a) depositing, onto the support plane (3), the first liquid (9) which immediately solidifies in contact with the support plane (3) forming a first containing layer (H1);
- the first containing layer (H1) defines an area which is greater than the area of the maximum section of the three-dimensional model defining the three-dimensional layered object (T) to be produced;
- b) flattening the face (20) of the first containment layer (H1) facing in the opposite direction relative to the support plane (3) thus creating a first flat face (20) coplanar to a plane (X_Y) ensuring a constant thickness (D1) of the first containing layer (H1);
- c) depositing, onto the first containing layer (H1), which was previously formed, the second liquid (11) which immediately solidifies in contact with the first containing layer (H1) forming a first structural layer (G2) of the three-dimensional layered object (T);
- the first structural layer (G2) is deposited in an area that has contours corresponding to the contours of a first section of the digital model of the three-dimensional layered object (T);
- d) depositing, onto the first containing layer (H1), at least in the zones that are not affected by the first structural layer (G2) the first liquid (9), which immediately solidifies in contact with the first containing layer (H) forming a second containing layer (H2), which completely surrounds the first structural layer (G2) in the directions X and Y;
- e) flattening the face (19a) of the second containing layer (H2) facing in the opposite direction relative to the support plane (3) and the face (19b) of the first structural layer (G2) facing in the opposite direction relative to the support plane (3), thus making said faces coplanar and ensuring a constant thickness of the first structural layer (G2) and of the second containing layer (H2);
- f) repeating steps c), d) and e) for all sections n of the three-dimensional model, thus producing an object formed by n superimposed structural layers (G2, G3, . . . Gi, . . . Gn) which is incorporated at the bottom and on the sides along the directions X and Y by n+1 containing layers (H1, H2, . . . Hi, . . . Hn+1);
- deactivating the cooling device (7) so that the temperature of the printing chamber (6) exceeds the melting temperature T1 and the containing layers (H1, H2, . . . Hi, . . . Hn+1) naturally go back to the liquid state, hence freeing the three-dimensional layered object (T) thus formed.