Method for high speed variable printing
Systems and methods for high-speed variable printing are provided. Ink jet technology and lithographic systems may be combined in such a way to create a fully variable and high-quality print system. Ink is applied to a printing cylinder. An aqueous solution is then applied on top of the ink to produce a negative image. A positive image is then transferred in ink to a print medium. The systems and methods described herein may be used to create high-quality one-to-one marketing applications.
1. A method of printing comprising the steps of:
providing a printing plate on a printing cylinder, the printing plate having an image area which accepts ink and a non-image area which does not accept ink thereon;
coating the printing plate on said cylinder with ink, so as to cover the image area of the printing plate;
applying an aqueous solution with an ink jet nozzle in a pattern on top of selected portions of the ink in said image area; and
transferring the ink from the printing plate on the printing cylinder to a substrate to form an image, such that the ink is transferred from said image area of the printing plate which is not covered by the aqueous solution.
2. The method of claim 1 further comprising a step of receiving image data before applying the aqueous solution on top of the selected portions of the ink, wherein the pattern is based at least in part on the image data.
3. The method of claim 1 wherein the step of applying the aqueous solution on top of the selected portions of the ink comprises a step of printing the aqueous solution.
4. The method of claim 3 wherein the step of printing is performed using a plurality of ink jet nozzles.
5. The method of claim 1 wherein the step of applying the aqueous solution on top of the selected portions of the ink comprises a step of emitting individual drops wherein the emission of each drop is individually controlled.
6. The method of claim 1 , wherein a further portion of the ink in the image area other than the selected portions is substantially free of aqueous solution.
7. The method of claim 1 wherein the aqueous solution includes water and one or more of ethylene glycol and propylene glycol.
8. The method of claim 1 wherein the aqueous solution includes a surfactant.
9. The method of claim 1 wherein the step of transferring the ink comprises a step of pressing the image area to the substrate.
10. The method of claim 1 wherein the aqueous solution comprises a gel.
11. The method of claim 1 , as used in a variable printing process.
12. The method of claim 2 , wherein the image data comprises fixed data, semi-fixed data, or variable data, and combinations thereof.
13. The method of claim 1 , wherein the substrate is a sheet.
14. The method of claim 1 , wherein the substrate is a web.
15. The method of claim 1 , wherein the substrate comprises paper.
16. The method of claim 1 , wherein the step of transferring comprises the step of contacting the printing plate with a blanket cylinder.
17. The method of claim 1 , wherein the step of transferring comprises the step of contacting the printing plate with an endless belt.