device having one or more operative units for electroplating a film by chemical reaction with a specially made liquid product and application of direct current , on sheets for printed circuits continuously translating between one or more pairs of opposing oblong chambers respectively supplied with tubular nozzles and with one longitudinal slit nozzle and having internal electrodes electrically connected to the negative pole of a generator of direct current , between one or more pairs of titanium contact rollers , electrically connected to the positive pole of the current , and plastic containment rollers of the liquid rotating in each pair reciprocally in opposite directions , due to closure of the electric circuit between the liquid product , pumped in under pressure by the pump and projected by the nozzles of the chambers against the sheets , and said sheets through the contact rollers .