B - Operations – Transporting – 41 – F
Patent
B - Operations, Transporting
41
F
101/103, 26/200
B41F 31/00 (2006.01) B41F 31/26 (2006.01) B41K 1/38 (2006.01) B41L 27/00 (2006.01) B41N 7/06 (2006.01) C21D 9/38 (2006.01) C23C 8/38 (2006.01)
Patent
CA 1335637
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.
575115
Della Torre Renato
Macrae & Co.
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