... for A. Packing Cylinder1, Variou plastic packing printing,2, Aluminum-plating packing printing,3, Daily product packing printing4, Clothing packing ... finish.4, Technology and material1, Steel tube as base material,2, Plating a copper layer on the steel ... file (or original printing sample) →computer electronic color management (at the same time processing the roller→copper plating→polishing surface ...