| 摘要 |
This patent describes a method of imaging a printing plate comprising on a substrate a photosensitive layer and a top laser ablatable mask layer. The method includes imagewise exposing the plate with an infrared laser to remove the mask layer in the exposed areas, overall exposing the plate with an actinic light to harden or solubilize the photosensitive layer in the areas where the mask layer has been removed, and further exposing the plate with the infrared laser radiation in the laser non-exposed areas to remove the remaining mask layer. The fully exposed plate can be developed to bare the substrate in the non-hardened or solubilized areas of the photosensitive layer.
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