SURFACE PREPARATION UNIT FOR METAL STRIPS PROCESSING LINES

摘要

A surface preparation unit for metal strips processing lines comprises a tank (12), suitable to contain an electrolyte solution, a system for the suspension/submersion of a strip (11) to be treated, which is continuously fed into the tank (12) in longitudinal direction (F), a plurality of electrode cells (20) comprising upper and lower electrodes (21) respectively made up of upper and lower armatures (22) facing the two larger surfaces of the strip (11) and spaced therefrom respectively by a distance called "upper gap" and "lower gap", such electrodes (21) being connected to an electrical power supply system (34), wherein the tank (12) is shaped at the bottom to form successive hoppers (26), wherein at each of the electrode cells (20) there is provided a hopper (26) which ends with devices (27) for evacuating the waste material in form of undissolved scale, which deposits at the bottom in form of sludge.