Machine and method for making absorbent sanitary articles

A method for making absorbent sanitary articles which comprise an absorbent pad in turn comprising at least one discrete layer of superabsorbent polymer material;

• comprising:
• feeding at least one continuous web of impermeable material along a feed line;
• forming and applying a succession of absorbent pads along the continuous web by a forming and application unit;
• the forming and applying a succession of absorbent pads comprising feeding a charge of superabsorbent polymer material to a forming drum through a feeding duct comprising a valve device driven by an actuator unit;
• sending a detection signal indicating that the superabsorbent polymer material has been detected;
• comparing the detection signal with a reference signal;
• and
• driving the actuator unit of the valve device into phase with the forming drum;
• sending the detection signal when the charge of superabsorbent polymer material passes in the feeding duct downstream of the valve device, and wherein the reference signal is a sync signal of a rotation of the forming drum.