Method of on-press developing overcoated lithographic...

Details Method of on-press developing overcoated lithographic... Method of on-press developing overcoated lithographic...

2011-03-29

2011-03-29

Kelly, Cynthia H (Department: 1722)

Printing

Planographic

Processes of lithographic printing

C430S302000, C430S303000

Reexamination Certificate

active

07913620

ABSTRACT:
A method of processing an on-press developable lithographic printing plate involving the removal of overcoat after imagewise exposure and before on-press development is described. The plate comprises a substrate, an on-press ink and/or fountain solution developable photosensitive layer, and an overcoat. The laser imaged plate is stripped off the overcoat, and then under a white room light mounted on press and developed with ink and/or fountain solution. Here the plate is capable of hardening upon exposure to a laser, has limited white light stability before the removal of the overcoat, and has significantly improved white light stability after the removal of the overcoat.

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