... Highest printing speed can reach 250m/min.) 3. PerformanceExquisite ink layer, vivid color, clear and distinctness, able to print big ... 4, Technology and material1, Steel tube as base material,2, Plating a copper layer on the steel tube surface, 3, Engraving ... graphics on the copper layer, 4, Plating chrome layer 5. Production proceduresCustomer→electronic file (or original ...