MACHINE AND METHOD FOR MAKING ABSORBENT SANITARY ARTICLES

摘要

A machine for making absorbent sanitary articles including an absorbent pad with at least one discrete layer of superabsorbent polymer material includes a unit for forming and applying a succession of absorbent pads, which includes a drum for forming the pad, a duct for feeding a charge of superabsorbent polymer material to the drum and intermittent valve mounted along a stretch of the duct and driven by an actuator. A device detects the superabsorbent polymer material and sends a signal to a control and drive unit connected to the device indicating that the superabsorbent polymer material has been detected. The control and drive unit is configured to drive the actuator to bring the valve into phase with the rotation of the drum when the deviation of the signal from a reference signal exceeds a defined threshold value.

主权项

1. A machine for making absorbent sanitary articles which comprise an absorbent pad in turn comprising at least one discrete layer of superabsorbent polymer material, comprising:
a line for feeding at least one continuous web of impermeable material and at least one unit for forming and applying a succession of absorbent pads along the continuous web of impermeable material; the forming and application unit comprising a drum for forming the absorbent pad, a duct for feeding a charge of superabsorbent polymer material to the forming drum and intermittent valve means mounted along a stretch of the feeding duct and driven by its own actuator unit; a device for detecting the superabsorbent polymer material defining the discrete layer of the absorbent pad and a control and drive unit connected to the detecting device; the detecting device sending a superabsorbent polymer material detection signal and the control and drive unit being configured to acquire the detection signal and to compare it with a reference signal; the control and drive unit being configured to drive the actuator unit to bring the valve means into phase with the rotation of the forming drum if the deviation of the detection signal from the reference signal exceeds a defined threshold value.