Lithographic imaging with non-ablative wet printing members

Details Lithographic imaging with non-ablative wet printing members Lithographic imaging with non-ablative wet printing members

B - Operations, Transporting

41

C

B41C 1/10 (2006.01) G03F 7/34 (2006.01)

Patent

CA 2343630

Lithographic imaging using non-ablative printing members combines the benefits of simple construction, the ability to utilize traditional metal base supports, and amenability to imaging with low-power lasers that need not impart ablation-inducing energy levels. A representative printing member has a topmost layer that is ink-receptive and does not significantly absorb imaging radiation, a second layer thereunder that is hydrophilic and does absorb imaging radiation, and a metal substrate under the second layer. The printing member is selectively exposed to laser radiation in an imagewise pattern, and laser energy passes substantially unabsorbed through the first layer and is absorbed by the second layer. Heat builds up in the second layer sufficiently to detach the first layer, which is formulated to resist reattachment. But the first layer and, more significantly, the third layer act to dissipate heat from the second layer to prevent its ablation. Where the printing member has received laser exposure - that is, where of the first and second layers have been detached-remnants of the first layer are readily removed to produce a finished printing plate.

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