Continuous process for cleaning metal strip by etching in a tank of specific width and length and including a backwash device with avoidance of unequal distribution of the treatment liquid in the tank

摘要

Continuous process for surface treatment, preferably cleaning, of a metal strip by means of a treatment liquid, especially an etching liquid where the metal strip is traversed horizontally through a tank, especially a flat etching tank of specific width and length, the tank containing a device for backwashing of the treatment liquid. In the region of the backwash device part of the treatment liquid is passed from the center of the tank into the side region (sic). An independent claim is included for a surface treatment device as described above.