Three-dimensional object production

1. Apparatus to produce a three-dimensional object, the apparatus comprising:

a controller;

a first printhead;

a second printhead to deposit colorant according to a desired coloring of the object; and

an ultraviolet light emitting diode energy source to emit electromagnetic energy;

wherein the controller is to:

cause the first printhead to deposit a liquid which absorbs ultraviolet radiation emitted by the ultraviolet light emitting diode energy source onto a layer of particulate material;

cause the ultraviolet light emitting diode energy source to irradiate and preheat at least a portion of the layer of particulate material, after the liquid has been deposited onto the layer of particulate material; and

cause the second printhead to deposit the colorant of the desired coloring on the preheated portion of the layer of particulate material.

2. Apparatus according to claim 1 , wherein the ultraviolet light emitting diode energy source is to emit ultraviolet electromagnetic energy having a spectral width of about 5 nm to about 50 nm.

3. Apparatus according to claim 1 , wherein the ultraviolet light emitting diode energy source is to emit electromagnetic energy having a maximum intensity at a wavelength between about 385 nm to about 405 nm.

4. Apparatus according to claim 1 , wherein the controller is to:

cause the second printhead to deposit the colorant comprising a second liquid which absorbs ultraviolet radiation emitted by the ultraviolet light emitting diode energy source after the first printhead deposits the first liquid.

5. Apparatus according to claim 4 , wherein the first liquid deposited by the first printhead is white.

6. Apparatus according to claim 4 , the apparatus further comprising a third printhead, wherein the controller is to cause:

the third printhead to deposit a third liquid which absorbs ultraviolet radiation emitted by the ultraviolet light emitting diode energy source onto the layer of particulate material, after the second printhead deposits the second liquid.

7. Apparatus according to claim 4 , wherein the ultraviolet light emitting diode energy source is a first ultraviolet light emitting diode energy source, the apparatus comprising:

a second ultraviolet light emitting diode energy source;

wherein the controller is to cause the second ultraviolet light emitting diode energy source to irradiate at least a portion of the layer of particulate material, before the second printhead deposits the second liquid.

8. Apparatus according to claim 7 , wherein the first ultraviolet light emitting diode energy source has a first peak wavelength and the second ultraviolet light emitting diode energy source has a second peak wavelength, the first peak wavelength and the second peak wavelength being different to each other.

9. A method of producing a three-dimensional object, the method comprising:

forming a layer of particulate material;

depositing a liquid which absorbs ultraviolet radiation onto the layer of particulate material to form a surface to receive a desired coloring;

after the liquid has been deposited onto the layer of particulate material, heating the liquid using an ultraviolet light emitting diode energy source; and

printing colorant of the desired coloring on the heated liquid and particulate layer.

10. A method according to claim 9 , wherein heating the liquid using an ultraviolet light emitting diode energy source comprises irradiating at least a portion of the layer of particulate material with ultraviolet electromagnetic energy having a spectral width of about 5 nm to about 50 nm.

11. A method according to claim 9 , wherein the ultraviolet light emitting diode energy source emits electromagnetic energy having a maximum intensity at a wavelength between about 200 nm to about 405 nm.

12. A method according to claim 9 , wherein the colorant comprises a second liquid, wherein the second liquid absorbs ultraviolet radiation.

13. A method according to claim 9 , further comprising heating the first liquid, colorant and particulate material using a second ultraviolet light emitting diode energy source to fuse the particulate material into a portion of the object having the desired coloring.

14. A non-transitory computer-readable storage medium storing instructions that, when executed by a processor, cause the processor, to:

form a layer of particulate material;

deposit a liquid which absorbs ultraviolet radiation onto the layer of particulate material to form a surface to receive a desired coloring;

after the liquid has been deposited onto the layer of particulate material, heat the liquid using an ultraviolet light emitting diode energy source; and

printing colorant of the desired coloring on the heated liquid and particulate layer.

15. Apparatus according to claim 1 , wherein the ultraviolet light emitting diode energy source is to emit electromagnetic energy having a maximum intensity at a wavelength between about 200 nm to about 405 nm.

16. Apparatus according to claim 1 , wherein the liquid comprises a white dye.

17. Apparatus according to claim 1 , wherein the second printhead is to deposit Cyan, Yellow, Magenta and Black ink to form the desired coloring.

18. Apparatus according to claim 1 , further comprising a moveable carriage supporting the first printhead, second printhead and ultraviolet light emitting diode energy source, the carriage also supporting a second ultraviolet light emitting diode energy source and a third printhead to deposit the liquid.

19. Apparatus according to claim 18 , wherein the second printhead is disposed between the first and third printheads so that, when the carriages moves in either direction, either the first or third printhead will deposit the liquid on the particulate material, the liquid will be preheated by one of the energy sources, the desired coloring then printed by the second printhead after the preheating and the particular material and colored image then fused by the other of the energy sources.

20. Apparatus according to claim 1 , further comprising a carriage moveable in two directions over the particular material, wherein, along a direction of movement of the carriage, the carriage supports the first printhead, the ultraviolet light emitting diode energy source, the second printhead, a second ultraviolet light emitting diode energy source and a third printhead to deposit the liquid.