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Method and apparatus for the production of the inking rollers, in particular for flexographic printing machines, with cured surfaces with eingepraegten depressions and thus prepared rolls.
Method and apparatus for the production of the inking rollers, in particular for flexographic printing machines, with cured surfaces with eingepraegten depressions and thus prepared rolls.
A process for making metal inking rolls, particularly for flexographic printing, comprises: at least the selection of an ammonia hardenable material, particularly stainless, to provide the roll structure, the selection of a structure wherein the minimum thickness of the wall, when tubular, is a direct function of diameter and inverse function of the length, whereby, when supported at the ends and stressed in the middle, on a surface relatively distributed, may be permanently distorted in the axial attitude instead than transversely or at the cross- section; at least a post-engraving treatment to increase the surface hardness of the screen to at least 60 HRC and at least a final straightening step, to reduce the screen eccentricity at least to 0,02 mm.
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