Lithographic printing press and method for on-press imaging lithographic printing plate
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United States of America Patent
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app pub date -
Nov 15, 2006
filing date -
Feb 14, 2005
priority date (Note) -
Abandoned
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Abstract
A lithographic printing press having a plate cylinder in a substantially light-tight compartment suitable for on-press imaging and developing a laser sensitive plate is described. The plate cylinder as well as certain other press parts is covered by non-transparent and/or safe-light-passing-only covers so that no or only limited amount of unsafe light passes onto the plate mounted on the plate cylinder during on-press imaging and development. The plate comprises on a substrate a photosensitive layer soluble or dispersible in ink and/or fountain solution and capable of hardening upon exposure to a laser having a wavelength selected from 200 to 1200 nm. The plate is on-press exposed with the laser, developed with ink and/or fountain solution, and then directly prints inked images to the receiving sheets.
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