Imaging and erasing of a printing form made of polymer material containing imide groups
AssigneeHeidelberger Druckmaschinen AG
InventorJoaquin Barrera Calderon
Life of this patent
Estimating the term…
Abstract
A method for producing a pattern of hydrophilic (34) and hydrophobic (32) regions on a printing form (30) is presented which, in a first, essentially unpatterned state, features a polymer material containing imide groups, for example, polybenzene diimide or polyamide imide. The method includes a chemical treatment of the surface with an oxidizing agent subsequent in time to a locally selective exposure with UV light. Optionally, the locally selective exposure can be preceded by a large-area chemical treatment of the surface with a strong base. The printing form (30) can be restored to the first state by a large-area chemical treatment of the surface with a strong acid. The patterned printing form (30) is suitable for use in offset printing.
Claims15
A method for producing a pattern of hydrophilic and hydrophobic regions on a surface having a first unpatterned state, the surface including a polymer material containing imide groups, the method comprising the steps of:
- locally selectively exposing the surface by local irradation of electromagnetic energy;
- and
- chemically treating the surface with an oxidizing agent subsequent in time to the locally selective exposure.
A printing form, in particular, for use as a printing form in offset printing, comprising:
- a surface for printing, the surface including a polymer material containing imide groups.
Dependencies are inferred from the claim text.