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Method for erasing a lithographic printing master

  • US 6,408,755 B1
  • Filed: 08/15/2000
  • Issued: 06/25/2002
  • Est. Priority Date: 08/31/1999
  • Status: Expired due to Fees
First Claim
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1. A method of lithographic printing with a printing press comprising:

  • (i) making an imaging material by providing a support with an image recording layer, said imaging material comprising one or more layers containing a light absorbing compound in an amount not less than 50% by weight relative to all the layers of said imaging material, excluding the support;

    (ii) making a printing master having a printing surface comprising ink accepting areas by image-wise exposing and optionally developing the imaging material;

    (iii) starting a pressrun; and

    (iv) removing said ink accepting areas of said printing surface by treating said printing surface (1) with a plasma that is capable of operating at one atmosphere of pressure or (2) by directing an atmospheric plasma jet to said printing surface and scanwise moving said plasma jet relative to said printing surface.

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