Erasable printing plate having a smooth pore free ceramic or glass surface
AssigneeMAN Roland Druckmaschinen AG
InventorsBarbara Nussel, Hartmut Fuhrmann, Horst Dauer, Josef Gottling
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Abstract
A printing plate which can be repeatedly directly provided with an image and erased and is suitable for a wet offset printing method. The printing plate has a smooth and pore-free surface which is hydrophilic or can be hydrophilized after being provided with an image. The printing plate contains no strong microdipoles and consists of a ceramic, a glass or a metal, in particular of a metal alloy. An erasing and hydrophilizing apparatus preferably integrated in the printing press, repeatedly erases and prepares, i.e. rehydrophilizes, the printing plate for a further image-providing and printing process.
Claims7
A printing plate which can be directly provided with an image and erased and is suitable for wet offset printing, wherein said plate is made of a surface selected from the group consisting of a ceramic having a surface roughness of R.sub.a of equal to or smaller than 0.3 .mu.m and of glass which surface is pore-free and is at least one of hydrophilic and hydrophilizable, the plate also contains no strong microdipoles whereby the plate is erasable.
Dependencies are inferred from the claim text.