Method to remove unwanted, unexposed, radiation-sensitive...

Details Method to remove unwanted, unexposed, radiation-sensitive... Method to remove unwanted, unexposed, radiation-sensitive...

2005-01-18

2005-01-18

Colilla, Daniel J. (Department: 2854)

Printing

Planographic

Lithographic plate making, and processes of making or using...

C101S401100, C101S415100, C101S467000, C430S302000, C430S330000

Reexamination Certificate

active

06843176

ABSTRACT:
A method for forming a printing plate from a printing plate precursor having a radiation-sensitive layer, sensitive to radiation in a first frequency spectrum such as the far or near infrared, and to radiation in a second frequency spectrum other than the first frequency spectrum such as visible or ultraviolet. The plate is exposed twice. Once to imaging radiation in the first frequency spectrum and again to radiation in the second frequency spectrum. The second frequency spectrum exposure is done only to the areas of the plate undesirably shaded during the imagewise exposure.

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