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Volume: 41 | Article ID: art00016
Fundamental Mechanisms of Lithographic Printing Plate Imaging by Near-Infrared Lasers
  DOI :  10.2352/J.ImagingSci.Technol.1997.41.3.art00016  Published OnlineMay 1997

The fundamental mechanisms of exposure by near-infrared pulses of multilayer films, which can be used as lithographic printing plates, are investigated using time-resolved optical microscopy. The films were developed by Presstek, Inc. (Hudson, NH) for use in the PEARL™ imaging system. Exposure by 10-μs duration Gaussian profile pulses is shown to occur with an extremely sharp fluence threshold of Jth = 0.34 J/cm2. Exposure greatly alters the surface affinity for inks. Time-resolved microscopy shows the mechanism of surface alteration to involve thermochemical decomposition of the surface coating material, which results in its debonding from the film. Using threshold measurements and a theoretical thermal conduction model, debonding is shown to occur when the temperature in the film is about 500°C.

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David E. Hare, Stuart T. Rhea, Dana D. Dlott, Richard J. D'Amato, Thomas E. Lewis, "Fundamental Mechanisms of Lithographic Printing Plate Imaging by Near-Infrared Lasersin Journal of Imaging Science and Technology,  1997,  pp 291 - 300,

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Copyright © Society for Imaging Science and Technology 1997
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