Abstract

A printing form precursor comprises a printing surface which comprises an anodic layer which is hydrophobic and capable of being made hydrophilic by fast laser pulses but capable of becoming hydrophobic again, preferably for re-use, if desired. These changes are influenced by thickness of the anodic layer, and by alloying elements in the anodic layer. Benefit is gained also from using a darkly coloured anodic layer and by permitting the change from hydrophilic to hydrophobic to take place in a carbonaceous or siliceous atmosphere. By such means the invention achieves the goal of providing a printing form precursor which does not need a chemical developer, and which can be used multiple times, to print different images.

IPC Classes  ?

• B41C 1/10 - Forme preparation for lithographic printingMaster sheets for transferring a lithographic image to the forme
• B41N 1/00 - Printing plates or foilsMaterials therefor

Abstract

A method of imaging printing plates uses a single imaging device having at least one laser delivering, in an imagewise manner, pulsed electromagnetic energy of pulse duration not greater than 1 x10-6 seconds. Such an imaging method permits the imaging of a plurality of types of printing plates irrespective of any sensitised imaging chemistry contained in their coatings.

IPC Classes  ?

• B41C 1/10 - Forme preparation for lithographic printingMaster sheets for transferring a lithographic image to the forme

Abstract

A method of preparing a printing form precursor for printing, or a printed circuit board precursor or a semiconductor precursor, the method comprising the step of applying electromagnetic radiation having a pulse duration of not greater than 1 x 10-6 seconds, in an imagewise manner, to an imagable surface of the precursor. The imaging process may cause ablation of the coating of the precursor or permit its development in a developer. In each case the imaging radiation needs not be tuned to imaging chemistry (if any) present in the coating. Alternatively the imaging process may induce a change of hydrophilicity or hydrophobicity, or other change of state, of an uncoated substrate.

IPC Classes  ?

• B41C 1/10 - Forme preparation for lithographic printingMaster sheets for transferring a lithographic image to the forme
• G03F 7/20 - ExposureApparatus therefor

Abstract

A printing form precursor comprises a printing surfacewhichcomprisesan inorganic metal compound, the printing surface being hydrophobic and capable of being made hydrophilic by energy but capable of becoming hydrophobic again, for re-use, if desired. An associated method of printing includes steps of subjecting the printing surface imagewise to energy so as to locally increase its hydrophilicity sufficient to make the surface differentiated in its acceptance of an oleophilic a printing ink; applying the ink to the printing surface and printing from the printing surface; causing or allowing the printing surface to undergo a reduction in hydrophilicity sufficient again to make the printing surface uniform in its acceptance of a printingink; and,if wished, repeating these steps on multiple occasions. Thus the invention achieves the goal of providing a printing form precursor which does not need a chemical developer, and which can be used multiple times, to print different images.

IPC Classes  ?

• B41C 1/10 - Forme preparation for lithographic printingMaster sheets for transferring a lithographic image to the forme
• G03F 7/004 - Photosensitive materials