ROLL GRAINED ALUMINIUM SHEET

摘要

The method for producing lithosheet by providing at least one roll of a pair of rolls with a surface texture of microsopic size peaks of roll material and a pattern having substantially no directionality such that the roll surface is substantially uniformly rough. A metal sheet is directed between the rolls such that the rolls contact the sheet surfaces to provide at least one surface of the sheet with the non-directional roughness of the textured roll surface and extends the surface area of the sheet by an amount in the range of 0.05 to 10 % in the process of forming microscopic depressions in the sheet surface for receiving printing inks, for adhesion of hydrophobic coatings and/or photopolymers.