Method and apparatus for structuring a surface to form...

B - Operations – Transporting – 41 – C

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B41C 1/10 (2006.01) B41M 5/36 (2006.01) B41N 1/00 (2006.01)

Patent

CA 2386593

A method and an apparatus for structuring a surface (10) which comprises at least a first layer (12) which has a polymer, preferably polystyrene, to form hydrophilic and hydrophobic regions by creating a latent structure of the first layer (12) by means of an assigned modification device (16) for producing a printing form (10) for offset printing are disclosed. The method according to the invention and the associated apparatus according to the invention are distinguished by the fact that a gaseous, readily volatile solvent (18), for example an alcohol, an aldehyde, an ester or the like, is selectively applied as a modifying agent to at least one locally limited region of the surface (10) over at least one exposure time interval. The apparatus according to the invention may be used with particular advantage in particular in a printing form exposer or in a printing unit of a printing machine. -23-

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