| 摘要 |
<p>The invention relates to roller bodies made of steel, aluminium or carbon fibre reinforced plastic material, which, in printing units of wet offset machines, are in direct contact to the dampening form roller and which serve the formation of a stable ink-water-emulsion. The invention further relates to methods for producing such roller bodies. In conformity with the invention the roller body is provided with a porous coating of highly wear-resistant oxide ceramics or of wear-resistant hard metal, wherein pores that are open towards the circumferential surface of the roller body, are formed in the layer matrix of the coating preferably by applying the porous coating by a thermal spray process or an other coating process, and by subsequently grinding the coating to size to thereby open pores in the layer matrix. The surfaces produced in this manner preferably have a stable roughness of 1.0 µm z z = 5 µm to 25 µm. The thicknesses of the porous coating preferably ranges from 25 µm to 2000 µm, and most preferably amounts to about 150 µm.</p> |
