Printing apparatuses and related apparatuses and methods

1. A printing apparatus comprising:

a material delivery module comprising

a reservoir for storing a printing material,

a docking station, and

a conduit connecting the reservoir and the docking station,

the conduit having a conduit wall defining an inner conduit space and including a material line in the inner conduit space for carrying the printing material from the reservoir to the docking station, wherein the conduit is configured to carry a heated liquid, being heated from a liquid heater, flowing in the inner conduit space to contact the material line; and

a print head optionally connected to the docking station for ejecting drops of the printing material.

2. The printing apparatus of claim 1 , wherein the material delivery module further comprises the liquid heater in communication with the inner conduit space.

3. The printing apparatus of claim 2 , wherein the liquid heater includes the heated liquid replenishing port for replenishing spent and/or evaporated liquid.

4. The printing apparatus of claim 2 , wherein the conduit also includes the heated liquid flowing in the inner conduit space, the flowing liquid entering the inner conduit space from the heater through an entry port, and then exiting the inner conduit space through an exit port in fluid communication with the heater.

5. The printing apparatus of claim 1 , wherein the conduit also includes a liquid flowing in the inner conduit space, the flowing liquid and/or any material being carried in the material line being held at a temperature that does not vary with time by more than about 3.5° C. above a set point or about 6.0° C. below the set point after thermal equilibrium is established.

6. The printing apparatus of claim 1 , wherein the conduit also includes a liquid flowing in the inner conduit space at a temperature above about 25° C.

7. The printing apparatus of claim 6 , wherein the heated liquid has a specific heat capacity at 25° C. (C p25° C. ) of greater than about 2.0 J/gK.

8. The printing apparatus of claim 6 , wherein the heated liquid has a boiling point of greater than about 80° C.

9. The printing apparatus of claim 6 , wherein the heated liquid is a mixture of water and ethylene glycol.

10. The printing apparatus of claim 1 , wherein the docking station is in electrical communication with the print head.

11. The printing apparatus of claim 10 , wherein the docking station includes a valve operable on command from the print head for controlling flow of the printing material.

12. The printing apparatus of claim 1 , wherein the reservoir is connected to the conduit by an interface that includes a liquid flow pathway for delivering the heated liquid to the inner conduit space of the conduit.

13. The printing apparatus of claim 1 , wherein the conduit is connected to the docking station by an interface that includes a liquid return pathway for transferring the heated liquid exiting the conduit into a liquid return line in the inner conduit space.

14. The printing apparatus of claim 1 , wherein the reservoir includes a pump for conveying the printing material through the material line in the conduit.

15. The printing apparatus of claim 1 , wherein the reservoir includes a mixing device for homogenizing the printing material.

16. The printing apparatus of claim 1 , wherein the inner conduit space includes multiple material lines.

17. The printing apparatus of claim 1 , wherein the inner conduit space includes the liquid return line in communication with a heater.

18. The printing apparatus of claim 1 , wherein the material delivery module includes an ink in a component thereof.

19. The printing apparatus of claim 18 , wherein the ink includes a radiation curable material.

20. An apparatus for handling a printing material comprising a conduit having a conduit wall defining an inner conduit space and including a material line for carrying the printing material in the inner conduit space, wherein the inner conduit space is configured to carry a heated liquid, being heated from a liquid heater, to contact the material line.

21. The apparatus of claim 20 , wherein the conduit includes a liquid flowing in the inner conduit space, the flowing liquid and/or any material being carried in the material line being held at a temperature that does not vary with time by more than about 2.0° C. above a set point or about 5.0° C. below the set point after thermal equilibrium is established.

22. The apparatus of claim 21 , wherein the liquid has a specific heat capacity at 25° C. (C p25° C. ) of greater than about 2.0 J/gK.

23. A method of handling a printing material, the method comprising the steps of:

providing a printing material; and

conveying the printing material through an apparatus comprising a conduit having a conduit wall defining an inner conduit space and including a material line containing the printing material, wherein the inner conduit space is configured to carry a heated liquid, being heated from a liquid heater, to contact the material line.

24. A method of printing on a substrate, the method comprising the steps of:

providing a printing material;

conveying the printing material through an apparatus comprising

a conduit having a conduit wall defining an inner conduit space and including a material line in the inner conduit space carrying the printing material, wherein the conduit also includes a heated liquid, being heated from a liquid heater, flowing in the inner conduit space to contact the material line, and

a pressure chamber communicating with the material line and an aperture; and

pressurizing the pressure chamber to eject drops of the printing material out of the aperture.

25. The method of claim 24 , wherein the pressure chamber forms part of a piezoelectric printhead.

26. The method of claim 24 , wherein the printing material comprises an ink.

27. The method of claim 26 , wherein the ink comprises a radiation curable material.