Importance

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Abstract

On-press ink and/or fountain solution developable lithographic printing plates having on a roughened substrate a substantially conformal thermosensitive layer capable of hardening upon exposure to an infrared radiation; The surface of the thermosensitive layer has peaks and valleys substantially corresponding to the major peaks and valleys of the substrate microscopic surface, allowing low tackiness and good block resistance. The plate can be imagewise exposed with an infrared radiation and then on-press developed with ink and/or fountain solution by rotating the plate cylinder and engaging ink and/or fountain solution roller. The developed plate can ten directly print images to the receiving sheets. The imagewise exposure can be performed off press or with the plate being mounted on the plate cylinder of a lithographic press.

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First Claim