Methods for high speed printing
Methods for high-speed printing include deposition of individual drops of an aqueous solution on top of a hydrophobic ink applied to a print cylinder. The methods further include stripping away the ink from the area of the cylinder not covered by the aqueous solution and transferring the ink covered by the aqueous solution to a print medium.
1. A method of printing comprising the steps of:
applying a hydrophobic ink to a cylinder;
placing individual drops of an aqueous solution on the ink wherein placement of each drop is individually controlled;
stripping away the ink from an area of the cylinder not covered by the aqueous solution; and
transferring the ink covered by the aqueous solution to a print medium.
2. The method of claim 1 wherein the step of placing individual drops comprises the step of printing the aqueous solution onto the cylinder.
3. The method of claim 2 wherein the step of printing is performed using at least one jet nozzle.
4. The method of claim 1 wherein the step of placing individual drops comprises the step of jetting the aqueous solution onto the cylinder.
5. The method of claim 4 wherein the step of jetting is performed using at least one ink jet head.
6. The method of claim 1 wherein the aqueous solution includes ethylene glycol, propylene glycol, and any combination thereof.
7. The method of claim 1 wherein the aqueous solution includes a surfactant.
8. The method of claim 1 wherein the step of stripping away the ink comprises pulling the ink away from the cylinder with at least one blank web.
9. The method of claim 1 wherein the step of stripping away the ink comprises stripping away the ink using a reverse form roller.
10. The method of claim 9 wherein the step of stripping away the ink further comprises simultaneously stripping away a portion of the aqueous solution using the reverse form roller.
11. The method of claim 1 wherein the aqueous solution comprises a gel.
12. The method of claim 1 for use in a variable print process.
13. A method of printing comprising the steps of:
applying a hydrophobic ink to a cylinder;
placing individual drops of an aqueous solution on a portion of the ink in dependence upon image data representing an image;
stripping away the ink from an area of the cylinder not covered by the aqueous solution; and
transferring the portion of the ink covered by the aqueous solution to a print medium.
14. The method of claim 13 wherein the aqueous solution includes water and ethylene glycol, propylene glycol, and any combination thereof.
15. The method of claim 14 wherein the aqueous solution further includes a surfactant.
16. The method of claim 15 wherein the step of stripping away the ink comprises pulling the ink away from the cylinder with at least one blank web.
17. The method of claim 15 wherein the step of stripping away the ink comprises stripping away the ink using a reverse form roller.
18. The method of claim 17 wherein the step of stripping away the ink further comprises simultaneously stripping away a portion of the aqueous solution using the reverse form roller.
19. The method of claim 13 wherein the aqueous solution comprises a gel.
20. The method of claim 13 for use in a variable print process.
21. The method of claim 13 , wherein the image data comprises fixed data, semi-fixed data, or variable data, and combinations thereof.
22. The method of claim 13 , wherein the step of placing individual drops comprises the step of using an ink jet head to emit individual drops.
23. The method of claim 1 , wherein the step of placing comprises the step of using a jet system to emit drops.
24. The method of claim 1 , wherein the placement of each drop is individually controlled in dependence upon image data representing an image.
25. The method of claim 24 , wherein the image data comprises fixed data, semi-fixed data, or variable data, and combinations thereof.