Printing plate with reversible charge-controlled wetting
AssigneeXerox Corporation
InventorsRoss D Bringans, Jaan Noolandi, David K Biegelsen, David K Fork, Scott A Elrod
Life of this patent
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Abstract
The present invention is a method and system for lithographic printing by controlling the surface energy of a printing plate to affect the hydrophilic and hydrophobic properties of the printing plate. These properties enable the ink to be applied to the printing plate in an image-wise manner and provides for rapid production of images on a recording medium. The lithographic printing plate may be rewritten repeatedly between printing jobs or may even be rewritten between individual recording media.
Claims32
A lithographic printing plate with reversible charge-controlled wetting properties, comprising:
- an electrically grounded substrate;
- a charge generating layer on the electrically grounded substrate;
- and
- a charge transport layer on the charge generating layer, wherein the surface of the lithographic printing plate includes reversible hydrophilic and hydrophobic areas which are provided by image-wise distribution of charges on the printing plate.
A lithographic printing plate with reversible charge-controlled wetting properties, comprising:
- an electrically grounded substrate;
- a conductive drum layer on the electrically grounded substrate;
- and
- an insulating layer on the metal drum layer, wherein the surface of the lithographic printing plate includes reversible hydrophilic and hydrophobic areas which are provided by image-wise distribution of charges on the printing plate.
A lithographic printing method, comprising:
- image-wise distributing charges on a printing plate having reversible charge-controlled wetting properties so as to provide reversible hydrophilic and hydrophobic areas on the surface of the printing plate;
- and
- exposing the printing plate to a polar ink.
A lithographic printing method, comprising:
- distributing charges on a printing plate having reversible charge-controlled wetting properties so as to provide reversible hydrophilic and hydrophobic areas on the surface of the printing plate;
- exposing the printing plate to light;
- and
- exposing the printing plate to a polar ink.
A lithographic printing method, comprising:
- distributing charges on a printing plate having reversible charge-controlled wetting properties so as to provide reversible hydrophilic and hydrophobic areas on the surface of the printing plate;
- exposing the printing plate to light;
- exposing the printing plate to polar liquid;
- and
- exposing the printing plate to an oil-based ink.
A lithographic printing method, comprising:
- exposing a printing plate having reversible charge controlled wetting properties to light in a high intensity field so as to provide reversible hydrophilic and hydrophobic areas on the surface of the printing plate;
- exposing the printing plate to a polar liquid;
- and
- exposing the printing plate to an oil-based ink.
A lithographic printing method, comprising:
- exposing a printing plate having reversible charge controlled wetting properties to light in a high intensity field so as to provide reversible hydrophilic and hydrophobic areas on the surface of the printing plate;
- and
- exposing the printing plate to a polar ink.
Dependencies are inferred from the claim text.