Abstract: Metal inking rolls, particularly for flexographic printing, having: A roll structure composed of an ammonia hardenable steel, in particular stainless steel, the selection of a roll wherein the minimum thickness of the wall, if tubular, is a direct function of the diameter and an inverse function of the length of the roll, so that, when the roll is supported at its ends and stressed in the middle, on a surface relatively distributed, it may be permanently distorted in the axial direction but without distorting its cross-section; a post-engraving ionic nitriding treatment to increase the surface hardness of the screen to at least 60 HRC and a final straightening step, to reduce the screen eccentricity at least 0.02 mm.

Abstract: A process for making metal inking rolls, particularly for flexographic printing, having: A roll structure composed of an ammonia hardenable steel, in particular stainless steel, the selection of a roll wherein the minimum thickness of the wall, if tubular, is a direct function of the diameter and an inverse function of the length of the roll, so that, when the roll is supported at its ends and stressed in the middle, on a surface relatively distributed, it may be permanently distorted in the axial direction but without distorting its cross-section; a post-engraving ionic nitriding treatment to increase the surface hardness of the screen to at least 60 HRC and a final straightening step, to reduce the screen eccentricity at least 0.02 mm.

Abstract: A process and machine for automatically matching at least two substantially cylindrical surfaces for engaging each other, particularly for the purpose of mechanical embossment engraving. The ranges of freedom of a conventional machine are mechanized and subjected to an electronic control, providing a hardware structure driven by software. The software controls the starting, repetitive and final steps, automatically complying with spacing and timing. The operator's action is needed only for loading of the roll to be worked, setting the inherent knurling tool, setting the starting positioning, and starting the cycle, as well as, for removing the unfinished roll for the corrosion steps and of course for final unloading.