Wet offset printing form
AssigneeMaschinenfabrik Wifag
InventorsMatthias Riepenhoff, Olivier Stehlin
Life of this patent
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Abstract
A wet offset printing form has a top layer containing a photocatalytically and thermally modifiable material. The material can be brought photocatalytically into a hydrophilic state by irradiation with light and into a lipophilic state by heating. The hydrophilic state forms a surface that can be illustrated and the lipophilic state forms an illustrated surface. The top layer of the wet offset printing form may contain absorption centers for irradiation, especially for laser radiation in the NIR range, with which heating of the top layer in the pattern of an image is brought about.
Claims13
A process for erasing or illustrating a printing style of a wet offset printing form, comprising the steps of;
- providing a form which contains on a surface forming the printing style a photocatalytically and thermally modifiable material that can be brought into a hydrophilic state by irradiation with light and into a lipophilic state by heating;
- erasing or producing a printing style by irradiating said surface with UV radiation;
- and
- feeding water to said surface during the irradiation.
A device for repeatedly illustrating a wet offset printing form, the device comprising:
- a form with a surface that can be or is already illustrated, the form having a photocatalytically and thermally modifiable material, which can be brought photocatalytically into a hydrophilic state by irradiation with light and into a lipophilic state by heating;
- an imaging means for producing a printing style by heating said photocatalytically and thermally modifiable material in the pattern of an image;
- an erasing means for erasing the printing style produced, wherein said erasing means has one or more radiation sources for daylight and/or UV light;
- and
- a humidifying unit for air conditioning by which a preset humidity can be generated and maintained at said printing form.
Dependencies are inferred from the claim text.