Erasable printing form
AssigneeMAN Roland Druckmaschinen AG
InventorsAlfred Hirt, Barbara Nussel, Robert Weiss
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Abstract
A method for producing an erasable printing form by making the outer layer of the printing form from a material containing strong micro-dipoles, preferably a ferroelectric material, in particular a ferroelectric ceramic. In wet offset printing, the non-printing areas of the printing form are rendered hydrophilic by a hydrophilizing agent and they are maintained during the entire printing process. Plate cleaners can, for example, be used as the hydrophilizing agents. The printing form can be erased by a nonpolar solvent and can be reused again by rendering the non-printing areas hydrophilic again.
Claims21
A method for producing an erasable printing form for wet offset printing, comprising the steps of:
- providing an outer layer having an outer layer surface that is hydrophobic, and micro-dipoles at least in the outer layer, the micro-dipoles having a strength sufficient for tightly bonding an agent having a hydrophilic effect to the surface;
- applying a removable masking material to the hydrophobic surface according to image areas;
- and
- rendering non-image areas hydrophilic with a hydrophilizing agent.
An erasable printing form for wet offset printing, obtained by the steps of:
- providing an outer layer with micro-dipoles and an outer layer surface that is hydrophobic,
- applying a removable masking material to the hydrophobic surface according to image areas, and
- rendering non-image areas hydrophilic with a hydrophilizing agent.
An erasable printing form for wet offset printing, comprising:
- an outer layer having a hydrophobic surface and micro-dipoles in the outer layer, the micro-dipoles having a strength sufficient for tightly bonding an agent having a hydrophilic effect to the surface;
- masking material removably applied to the hydrophobic surface according to image areas;
- and
- non-image areas made of a material which becomes hydrophilic in response to the application of a hydrophilizing agent to the non-image areas.
Dependencies are inferred from the claim text.