Claims
- 1. A direct-to-plate method of lithographic printing with a reusable substrate having a hydrophilic surface, the method including the steps of(a) making a negative-working imaging material by coating on the hydrophilic surface a coating solution comprising hydrophobic thermoplastic polymer particles and a hydrophilic binder; (b) making a printing master having ink-accepting areas by image-wise exposing the imaging material; (c) applying ink and fountain solution to the printing master; and (d) removing all the ink-accepting areas from the printing master by applying a cleaning liquid comprising an alcohol and an alkanolamine to the printing master.
- 2. A method according to claim 1 wherein the cleaning liquid is an aqueous solution comprising between 1% and 20% by weight of the alcohol and at most 20% by weight of the alkanolamine.
- 3. A method according to claim 1 further comprising a step (e) wherein the substrate is rinsed with water.
- 4. A method according to claim 3 wherein water is supplied to the substrate during step (e) in an amount not higher than 50 ml/m2.
- 5. A method according to claim 1 wherein during step (d) the printing master is rubbed by a cloth or a rotating brush or by jetting water or a volatile medium.
- 6. A method according to claim 1 wherein the alcohol is benzylalcohol or 2-butoxyethanol.
- 7. A method according to claim 1 wherein the alkanolamine is ethanolamine.
- 8. A method according to claim 1 wherein the substrate is a plate cylinder of a rotary printing press or a plate or sleeve mounted on a plate cylinder of a rotary printing press.
- 9. A method according to claim 1 wherein the coating solution or the cleaning liquid is sprayed or jetted onto the substrate.
- 10. A direct-to-plate method of lithographic printing with a reusable substrate having a hydrophilic surface, the method including the steps of(a) making a negative-working imaging material by coating on the hydrophilic surface a coating solution comprising hydrophobic thermoplastic polymer particles and a hydrophilic binder; (b) making a printing master having ink-accepting areas by image-wise exposing the imaging material; (c) applying ink and fountain solution to the printing master; and (d) removing the ink-accepting areas from the printing master by first applying alcohol to the printing master followed by an alkanolamine.
Priority Claims (1)
Number |
Date |
Country |
Kind |
00200176 |
Jan 2000 |
EP |
|
Parent Case Info
This application claims the benefit of U.S. Provisional Patent Application No. 60/179,016, filed Jan. 31, 2000, which is incorporated herein by reference.
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Provisional Applications (1)
|
Number |
Date |
Country |
|
60/179016 |
Jan 2000 |
US |