Printer ink dryer units

1. A printer ink dryer system comprising:

disposed with a print apparatus, at least one non-laser, ultraviolet light emitting diode (LED) as a light source configured to dry a printer ink layer formed by the print apparatus, the LED configured to dry the printer ink layer by causing evaporation of a solvent fluid therefrom.

2. The printer ink dryer system of claim 1 , the light source to cause evaporation of solvent fluid from a printer ink comprising at least one colorant, in which the ultraviolet light emitted from the light source is associated with a higher colorant absorption efficiency than solvent absorption efficiency.

3. The printer ink dryer system of claim 1 , in which the light source has a bandwidth of less than 30 nm.

4. The printer ink dryer system of claim 1 , in which the light source has a peak wavelength of 295-405 nm.

5. The printer ink dryer system of claim 1 , wherein the LED has a peak wavelength of 395 nm.

6. The printer ink dryer system of claim 5 , in which the light source has a bandwidth 30 nm or less.

7. The printer ink dryer system of claim 1 , further comprising Cyan, Yellow, Magenta and Black pigments in the solvent fluid, wherein ultraviolet light from the light source is absorbed by the Cyan, Yellow, Magenta and Black pigments in the solvent fluid with a difference in absorption efficiency of less than 30%.

8. The printer ink dryer system of claim 1 , wherein the non-laser LED emits radiation in a range of 300-450 nm with a bandwidth of 20-30 nm.

9. The printer ink dryer system of claim 1 , in which the light source comprises an array of non-laser, ultraviolet light emitting diodes.

10. The printer ink dryer system of claim 9 , wherein the array comprises ultraviolet LEDs that emit different wavebands, the printer ink dryer system configured to control selected LEDs in the array based on a waveband that is optimal for drying of a particular printing being printed.

11. The printer ink dryer system of claim 10 , the printer ink dryer system configured to selectively operate LEDs in the array that provide at least a minimum absorption efficiency for all colorants in the printing being printed.

12. A printer ink drying system comprising:

a dryer unit comprising at least one non-laser, ultraviolet light emitting diode (LED) as a light source to dry a printer ink layer by causing evaporation of a solvent fluid therefrom;

a printed substrate comprising undried ink, the undried ink comprising Cyan, Yellow, Magenta and Black pigments in solvent that is subject to evaporation; and

a conveyor system to convey the printed substrate to the dryer unit;

wherein ultraviolet light from the light source is absorbed by the Cyan, Yellow, Magenta and Black pigments with a difference in absorption efficiency of less than 30%.

13. The printer ink drying system of claim 12 , in which the light source has a bandwidth of less than 30 nm.

14. The printer ink drying system of claim 13 , in which the light source has a peak wavelength of 295-405 nm.

15. The printer ink drying system of claim 12 , wherein the LED has a peak wavelength of 395 nm.

16. The printer ink drying system of claim 15 , in which the light source has a bandwidth of 30 nm or less.

17. The printer ink drying system of claim 12 , wherein the non-laser LED emits radiation in a range of 300-450 nm with a bandwidth of 20-30 nm.

18. The printer ink drying system of claim 12 , in which the light source comprises an array of non-laser, ultraviolet light emitting diodes.

19. The printer ink drying system of claim 18 , wherein the array comprises ultraviolet LEDs that emit different wavebands, the printer ink dryer system to control selected LEDs in the array based on a waveband that is optimal for drying of a particular printing being printed.

20. The printer ink drying system of claim 19 , the printer ink dryer system to selectively operate LEDs in the array that provide at least a minimum absorption efficiency for all colorants in the printing being printed.