Printing form and method of modifying the wetting characteristics of the printing form
AssigneeHeidelberger Druckmaschinen AG
InventorPeter Hess
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Abstract
The printing form, such as a printing plate or the surface of a printing cylinder, has a semiconducting surface with defined hydrophobic and hydrophilic areas corresponding to a print image to be printed with the printing form. The wetting characteristics of the printing form can be altered. To this end, the surface of the printing form is first placed into an essentially uniform chemical state with a first wetting behavior. Parts of all of the areas of the semiconductor surface are then put into a second chemical state which has a second wetting property that is different from the first.
Claims28
A method of modifying a wetting characteristic of a printing form having a semiconducting surface, which comprises;
- bringing a semiconducting surface of a printing form into a first chemical state having a first wetting property;
- and
- bringing a portion of the semiconducting surface into a second chemical state having a second wetting property different from the first wetting property by modifying chemical terminal groups of the semiconducting surface.
A printing form, comprising:
- a semiconducting surface carrying a pattern of hydrophilic regions and hydrophobic regions;
- the hydrophilic regions having hydrophilic chemical terminal groups and the hydrophobic regions having hydrophobic chemical terminal groups.
Dependencies are inferred from the claim text.