Laser imageable lithographic printing plates

B - Operations – Transporting – 41 – N

Patent

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Details

B41N 1/14 (2006.01) B41C 1/055 (2006.01) B41C 1/10 (2006.01)

Patent

CA 2198209

Lithographic printing plates for wet or waterless offset printing are disclosed which can be imagewise exposed using a digitally controlled IR laser. The invention comprises a laser imageable lithographic printing plate comprising a substrate, a photosensitive coating on the substrate, and a water- soluble laser ablatable top coating containing dyes or polymers that absorb infrared, ultraviolet and visible light. Laminated transparent polymer films and/or peelable polymeric coatings films can be interposed between the coated substrate and a water-soluble and/or organic solvent soluble laser ablatable top layer to augment plate production or image inscription on the plate.

La présente invention se rapporte à des plaques lithographiques pour impression offset humide ou sèche, dont l'exposition pour la concrétisation de l'image peut se faire à l'aide d'un laser infrarouge à commande numérique. L'invention comprend une plaque lithographique dont l'image peut être réalisée par laser, ladite plaque comportant un substrat, un revêtement photosensible recouvrant le substrat, un revêtement supérieur capable d'enlèvement par laser et hydrosoluble, contenant des colorants ou des polymères qui absorbent l'infrarouge, l'ultraviolet et la lumière visible. Il est possible d'interposer, entre le substrat avec revêtement et une couche supérieure capable d'enlèvement par laser et soluble dans l'eau et/ou dans un solvant organique, des films polymères transparents stratifiés et/ou des films de revêtement polymères détachables afin d'augmenter le rendement de la plaque ou la gravure de l'image sur la plaque.

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