Lithographic printing members having secondary ablation...

Details Lithographic printing members having secondary ablation... Lithographic printing members having secondary ablation...

B - Operations, Transporting

41

C

B41C 1/10 (2006.01) B41M 5/24 (2006.01)

Patent

CA 2128911

Lithographic printing plates suitable for imaging by means of laser devices. Laser output ablates one or more plate layers, resulting in an imagewise pattern of features on the plate. The image features exhibit an affinity for ink or an ink-abhesive fluid that differs from that of unexposed areas. The plates also include a secondary ablation layer that ablates only partially, and in a controlled fashion, as a result of destruction of overlying layers.

Cette invention concerne des clichés offset adaptés à la gravure au laser. Le faisceau laser érode une ou plusieurs couches du cliché pour y créer les zones d'image à reproduire. Ces zones affichent une réceptivité à l'encre ou à un agent de mouillage différente des zones de non-image. Les clichés comportent également une couche d'ablation secondaire qui ne s'enlève qu'en partie et de façon contrôlée après destruction des couches sus-jacentes.

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