Method of offset printing with a reusable substrate
AssigneeAgfa-Gevaert
InventorsEric Verschueren, Peter Geerts
Life of this patent
Estimating the term…
Abstract
A direct-to-plate method of lithographic printing is disclosed which enables to recycle the lithographic substrate of the printing master. The method comprises the steps of (a) making a negative-working imaging material by coating on a hydrophilic substrate 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; (d) removing the ink-accepting areas from the printing master by supplying a aliphatic or aromatic compound having a structure comprising at least 6 carbon atoms. The above steps are preferably carried out on-press.
Claims9
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;
- (d) removing the ink-accepting areas from the printing master by supplying a cleaning liquid comprising an aliphatic or aromatic compound having a structure comprising at least 6 carbon atoms.
Dependencies are inferred from the claim text.